BIDIRECTIONAL WRENCH

Description

Field of the Invention

[0001] The present invention relates to a hand tool, particularly to a bidirectional wrench.

Background of the Invention

[0002] During the using of common hand tools such as screwdrivers and torque wrenches, there is a movement limitation of the human hand in rotation direction, namely the inability of the human hand to turn continuously in one direction. The operation of such a tool which a rotation axis of the handle is coaxial with the tool's main shaft consists of a repetition of the following cycle: first, the hand rotates the handle in the desirable direction (e.g. tightening or loosening a screw); second, the hand rotates in the opposite direction to reposition the tool for next cycle. During the second portion of the above mentioned cycle, the hand's reversed rotation can be achieved by re-grasping the handle after releasing it, or by the tool which is equipped with an one-way means such as a ratchet surface to keep the main shaft stationary during the reversed rotation of the handle, or by re-inserting the tool bit to the screw after extracting the bit from engagement with the screw. However, in any case, the hand's reversed rotation could not bring any effective advance of the fastener, and therefore it becomes a wasted movement.

[0003] U. S. Pat. No. 5,931,062 discloses a mechanical rectifier, which comprises a shaft; two driving element mounted on the shaft, each having a one-way clutch interposed between it and the shaft, with the clutches oriented in the same way on the shaft so that the shaft is always entrained in only one direction of rotation when either one of the two driving elements is rotated in that direction, and the shaft is overrun by a driving element that is rotated in the opposite direction; a rotation means positioned along the axis of the shaft and engaging a selected one of the driving elements; and a reversing mechanism coupling the two driving elements together and forcing them to always rotate in the opposite directions so that one driving element entrains the shaft and the other driving element overruns the shaft, thus causing the shaft to always turn in only one direction, regardless of the direction of rotation of the driving elements, so that transfers the bidirectional rotations of the rotation means (e.g. a handle) into the unidirectional rotation of the shaft. The mechanical rectifier can efficiently utilize the rotations of the rotation means in either way, i.e. no matter the handle rotates clockwise or anticlockwise, the shaft rotates in the same direction, therefore it can improve the efficiency of the hand motion, and save operation time.

[0004] However, the converting mechanism of the invention can only make the shaft rotate in on direction, which could not meet the requirement of rotating the shaft in two directions, such as, tightening or loosening a fastener in the application of a torque wrench, the torque wrench equipped with the converting mechanism of the invention could only get the result of tightening a fastener (or loosening a fastener) no matter what operation it executes, either tightening or loosening a fastener, as the conventional wrenches do. If you expect the torque wrench equipped with the converting mechanism of the invention could executes the operation of tightening and loosening a fastener, the considerable solution can only be that the two ends of the shaft of the torque wrench are both mounted with output, and one end is to execute the operation of tightening a fastener, the other to execute the operation of tightening a fastener. But this design is cumbersome, it is inconvenient to choose appropriate output end when using the torque wrench.

[0005] International Publication No. WO 88/03999 A1 discloses a transmission which has unidirectional output rotation in response to multidirectional input rotation. The transmission comprises an output member and a reversing member. The reversing member is received in aperture of the output member. The reversing member has an integral head which extends from the circular plate away from the output member.

[0006] International Publication No. WO 2013/004045 A1 discloses a bidirectional mechanical converting unit which comprises a main shaft, a driving mechanism which including a driving means and a reversing means, and a rotation means. The reversing means is sleeved on the main shaft.

[0007] France Publication No. 2771667 A3 discloses a socket driving head which carries a connector to transmit the drive to the socket. A steel ball is fitted into the drive shaft of the connector and is fixed to secure the socket by a coupling rod, which passes through the hole in the screw and the corresponding hole in the connector.

[0008] U.S. Publication No. US 2012/186400 A1 discloses a power tool which includes a motor having a motor drive shaft, a drive assembly, an output member and a first housing. The output assembly includes a single-pawl ratchet design.

[0009] Therefore, it is desired to develop a bidirectional wrench which is capable of switching the rotation direction of the shaft conveniently.

Summary of the Invention

[0010] In the view of the above, the technical object of the present invention is to provide a bidirectional wrench which can switch the rotation direction of the main shaft conveniently.

[0011] In one aspect, the present invention provides a bidirectional wrench as defined in claim 1.

[0012] For the above purpose, one embodiment provides a bidirectional wrench, and comprises: a working part and a handle, the working part consisting of a main shaft, the main shaft being used to output torque and its axis being perpendicular to the handle; a capstan gear, a follower gear, an transmission seat and an idle gear, the capstan gear, the follower gear and the transmission seat being all mounted on the main shaft, the idle gear being mounted on the transmission seat and rotating between the capstan gear and the follower gear, wherein the handle entrains the capstan gear to rotate, and the transmission seat is equipped with a holding device, when holding the holding device and rotating the handle to entrain the capstan gear, the capstan gear entraining the follower gear to rotate reversely via the idle gear; a first ratchet surface rotating together with the capstan gear, and a second ratchet surface rotating together with the follower gear; a first pawl element and a second pawl element which are capable of driving the main shaft to rotate; wherein the first pawl element has a first pawl and a second pawl which are matched with the first ratchet surface selectively, wherein the first pawl skids on the first ratchet surface in the first direction but engages with the first ratchet surface in the second direction, and the second pawl engages with the first ratchet surface in the first direction but skids on the first ratchet surface in the second direction; the second pawl element has a third pawl and a forth pawl which is matched with the second ratchet surface selectively, wherein the third pawl skids on the second ratchet surface in the first direction but engages with the second ratchet surface in the second direction, and the forth pawl engages with the second ratchet surface in the first direction but skids on the second ratchet surface in the second direction; a reversing switch, which is capable of setting the first pawl element and the second pawl element on a first condition and a second condition, the first pawl and the third pawl are matched with the first ratchet surface and the second ratchet surface respectively under the first condition; the reversing switch comprises a newel, the newel being disposed inside the main shaft; one end of the main shaft is an output end which extends beyond a head of the handle; the second pawl and the forth pawl are matched with the first ratchet surface and the second ratchet surface respectively under the second condition; the first direction is clockwise or anticlockwise, the second direction is opposite to the first direction.

[0013] In a further embodiment, the handle has a ring-shaped head, and the first ratchet surface is disposed on the inner circumference of the ring-shaped head.

[0014] In a further embodiment, the first ratchet is disposed on the inner circumference of the capstan gear.

[0015] In a further embodiment, the second ratchet is disposed on the inner circumference of the follower gear.

[0016] In a further embodiment, the holding device is a holding ring.

[0017] In the further embodiment, the first pawl element and/or the second pawl element are/is fan-shaped.

[0018] In a further embodiment, the first pawl element and the second pawl element are mounted on the countershaft, the axis of the countershaft is parallel to but not overlap in the main shaft, and the countershaft engages with the main shaft and is capable of entraining the main shaft to rotate.

[0019] In a further embodiment, the countershaft drills through the main shaft.

[0020] In a further embodiment, the reversing switch further comprises a first spring-loaded plunger and a second spring-loaded plunger, the first spring-loaded plunger and the second spring-loaded plunger is fix on the newel in turn, and the first spring-loaded plunger and the second spring-loaded plunger matches with the first pawl element and the second pawl element respectively.

[0021] In a further embodiment, springs are disposed inside the first spring-loaded plunger and the second spring-loaded plunger.

[0022] In a further embodiment, the first pawl element matched with the first spring-loaded plunger has a first special shaped surface comprising a first concave section having a first side wall and a second side wall; the second pawl element matched with the second spring-loaded plunger has a second special shaped surface comprising a second concave section having a third side wall and a fourth side wall; under the first condition, the first spring-loaded plunger connects with the first side wall and the second spring-loaded plunger connects with the third side wall; under the second condition, the first spring-loaded plunger connects with the second side wall and the second spring-loaded plunger connects with the fourth side wall.

[0023] In a further embodiment, the wrench comprises a knob and the newel comprises two ears arranged to be embedded into the knob, the knob being matched with the newel.

[0024] In a further embodiment, the bidirectional wrench comprises a blocking device arranged to keep the bidirectional wrench on the working mode selected until being switched to other mode, the blocking device comprises: a ball disposed between an output end of the main shaft and the newel; a groove, configured to be able to be matched with the ball, comprising a first groove and a second groove.

[0025] In a further embodiment, the number of the idle gears is two, the idle gears mounted on an axis of the transmission seat that is perpendicular to the axis of the main shaft, wherein the idle gears respectively face to each other.

[0026] In a further embodiment, the capstan gear and the follower gear are face-gears, faces of the capstan gear and the follower gear being face to face, the idle gear being angle gears.

[0027] The bidirectional wrench of the present invention achieves two working modes between which the wrench can convert conveniently. During the use of the bidirectional wrench of the present invention, the input torque that the operator exerts is a clockwise torque or an anticlockwise torque, and the output torque of the output end of the bidirectional wrench of the present invention is a clockwise torque or an anticlockwise torque alternatively.

[0028] The present invention would be described in detail hereinafter in combination with the attached drawings for better understanding the purpose, features and effects of the present invention.

Brief Description of the Drawings

[0029] 

Figure 1 is a front view of the bidirectional wrench of the present invention;

Figure 2 is a sectional view of the bidirectional wrench in Figure 1;

Figure 3 shows the driving mechanism in the bidirectional wrench of the present invention;

Figure 4 shows the reversing mechanism in the bidirectional wrench of the present invention;

Figure 5 shows the main shaft mounted first pawl element and second pawl element;

Figure 6 is a front view of the first pawl element in Figure 5;

Figure 7 shows cooperation between the first pawl element and the first ratchet surface when the bidirectional wrench of the present invention is on the first working mode;

Figure 8 shows the knob for changing working mode of the bidirectional wrench of the present invention;

Figure 9 shows the blocking device in the bidirectional wrench of the present invention;

Figure 10 is a side view of the blocking device in Figure 5.

Detailed Description of the Preferred Embodiments

[0030] As shown in Figure 1 and 2, the bidirectional wrench, which refers to one detailed embodiment of the present invention, comprises a handle 20 and a working part 10, the handle 20 is socketed to the working part 10 across the ring-shaped head 21 (see Figure 3) through longitudinal extension. Inside the working part 10 is main shaft 100, outside is a holding ring. One end of the main shaft is an output end 101 which extends beyond the working part 10 and the head 21 of the handle 20. The output end 101 can be a component, which is suitable to operate various fasteners like quoining screw, by mounting different sleeves.

[0031] The bidirectional wrench of the present invention consists of a driving mechanism coupling with a reversing mechanism, the input torque from the handle 20 is transmitted to the main shaft 100 of the working part 10 through the driving mechanism, and make the direction of the output torque from the output end 101 be the first direction or the second direction, wherein the first direction and the second direction are opposite. Such as, when the input torque of the working part 10 is a clockwise torque or an anticlockwise torque, the output torque of the output end 101 is a clockwise torque; or, when the input torque of the working part 10 is a clockwise torque or an anticlockwise torque, the output torque of the output end 101 is an anticlockwise torque.

[0032] The structure of the driving mechanism of the bidirectional wrench of the present invention is shown in Figure 3, consists of a first ratchet surface 311, a capstan gear 312, a second ratchet surface 321, a follower gear 322, a transmission seat 330, an idle gear 331 and 332. Wherein, the first ratchet surface 311 and the capstan gear 312 connect and be coaxial with each other, in this embodiment, the first ratchet surface 311 is disposed in the inner circumference of the ring-shaped head 21 of the handle 20, the driving gear engages with the head 21 of the handle 20, thus the head 21 will drive driving gear to rotate when the handle 20 rotates, in other embodiment, the first ratchet surface 311 can be disposed in the inner circumference of capstan gear 312; the second ratchet surface 321 can be disposed in the inner circumference of follower gear 322. The faces of the first ratchet surface 311 and the second ratchet surface 321 connect with the outer face of the main shaft 100; the capstan gear 312 and the follower gear 322 are face-gears, faces of the capstan gear 312 and the follower gear 322 are face to face. The first ratchet 311, the second ratchet 321, the capstan gear 312 and the follower gear 322 are coaxial and the center axes thereof overlap in that of the main shaft 100.

[0033] The transmission seat 330 and the holding ring 102 are fixed together. The idle gear 331, 332 are mounted on the transmission seat 330, which is perpendicular to the main shaft 100. The idle gear 331, 332 are matched between the capstan gear 312 and the follower gear 322, their tooth engage with the tooth of the capstan gear 312 and the follower gear 322 to drive respectively, when the holding ring 102 is fixed, or the transmission seat 330 is fixed, the capstan gear 312 will drive the follower gear 322 to rotate via the idle gear 331, 332. In this embodiment, the idle gear 331, 332 are angle gears.

[0034] The structure of the reversing mechanism of the bidirectional wrench of the present invention is shown in Figure 4, comprises a newel, a reversing switch consisting of a first spring-loaded plunger 221 and a second spring-loaded plunger 222, a first pawl element 211 and a second pawl element 212. Wherein, the newel 220 is fixed in the main shaft 100, the first spring-loaded plunger 221 and the second spring-loaded plunger 222 are fixed on the newel 220 in turn, the first spring-loaded plunger 221 and the second spring-loaded plunger 222 are perpendicular to the main shaft 100 along the active direction, preferably, the first spring-loaded plunger 221 and the second spring-loaded plunger 222 have elastic elements such as a spring. The first pawl element 211 and second pawl element 212 are fixed on the main shaft 100 across the countershaft 210, as shown in Figure 5, the countershaft 210 is parallel to the center axis of the main shaft 100 but it does not overlap in it, the first pawl element 211 and the second pawl element 212 can rotate round the countershaft 210.

[0035] The first pawl element 211 and the second pawl element 212 have a similar structure, namely a first fan-shaped pawl, a second fan-shaped pawl and a fan-shaped space between them. Take the first pawl element 211 for example, Figure 6 shows the top view of the first pawl element 211 (direction towards the output end 101 along the main shaft 100), as can be seen from Figure 6, the first pawl element 211 consists of the first fan-shaped pawl 2111, the second fan-shaped pawl 2112 and the fan-shaped space between them. The fan-shaped face of the first fan-shaped pawl 2111, the fan-shaped space center section and the fan-shaped face of the second fan-shaped pawl 2112 constitutes the first surface of the first pawl element 211. The first pawl element 211 also has a second surface which is a special shaped surface and contains a concave section 2113, which has a first side wall 2114 and a second side wall 2115, in this embodiment. The first side wall 2114 and the second side wall 2115 extend along the main shaft 100. The first pawl element 211 has a hole 2101 which is matched with the countershaft 210, the countershaft 210 fixes the first pawl element 211 on the main shaft across the hole 2101 (see Figure 5). In this embodiment, the hole 2101 is arranged on the fan-shaped center section of the first pawl element 211, preferably, on the center of gravity of the first pawl element 211. The structure of the second pawl element 212 is similar to the first pawl element 211, no more description, its thickness is less than that of the first pawl element 211 in this embodiment, but in other embodiments, its thickness can be equal to or more than that of the first pawl element 211.

[0036] The first surface of the first pawl element 211 and the second pawl element 212 face to the first ratchet surface 311 and the second ratchet surface 321 respectively, specifically, the tooth of the fan-shaped pawl (which contains the first fan-shaped pawl 2111 and the second fan-shaped pawl 2112) of the first pawl element 211 face to the tooth of the first ratchet 311, the tooth of the fan-shaped pawl (contains the first fan-shaped pawl and the second fan-shaped pawl) of the second pawl element 212 face to the tooth of the second ratchet surface 321. The second surface of the first pawl element 211 and the second pawl element 212 face to the surface of the newel 220, specifically, the second surface of the first pawl element 211 faces to the ball-head section of the first spring-loaded plunger 221, the second surface of the second pawl element 212 faces to the ball-head section of the second spring-loaded plunger 222. Across the newel 220, the ball-head section of the first spring-loaded plunger 221 connects with the first side wall 2114 of the concave section 2113 of the first pawl element 211, the ball-head section of the second spring-loaded plunger 222 connects with the first side wall of the concave section of the second pawl element 212, when the bidirectional wrench of the present invention is on the first working mode; or, the ball-head section of the first spring-loaded plunger 221 connects with the second side wall 2115 of the concave section 2113 of the first pawl element 211, the ball-head section of the second spring-loaded plunger 222 connects with the second side wall of the concave section of the second pawl element 212, when the bidirectional wrench of the present invention is on the second working mode.

[0037] When the bidirectional wrench of the present invention is on the first working mode, see Figure 7, the tooth of the first fan-shaped pawl 2111 of the first pawl element 211 connects with the tooth of the first ratchet surface 311, similarly, the tooth of the first fan-shaped pawl of the second pawl element 212 connects with the tooth of the second ratchet surface 321. When the head 21 of the handle 20 drives the first ratchet surface 311 to rotate, when the moving direction of the first ratchet surface 311 beside the first fan-shaped pawl 2111 is from the first fan-shaped section 2111 to the second fan-shaped section 2112, namely the first ratchet surface 311 rotates clockwise seen in the Figure 7, since the ball-head section of the first spring-loaded plunger 221 connects with the first side wall 2114 of the concave section 2113 of the first pawl element 211, the first ratchet surface 311 cannot drive the first pawl element 211 to rotate, namely the tooth of the first fan-shaped pawl 2111 does not engage with the tooth of the first ratchet surface 311; but when the moving direction of the first ratchet surface 311 beside the first fan-shaped pawl 2111 is from the second fan-shaped section 2112 to the first fan-shaped section 2111, namely the first ratchet surface 311 rotates anticlockwise seen in the Figure 7, since the ball-head section of the first spring-loaded plunger 221 connects with the first side wall 2114 of the concave section 2113 of the first pawl element 211, the first ratchet surface 311 can drive the first pawl element 211 to rotate, namely the tooth of the first fan-shaped pawl 2111 engages with the tooth of the first ratchet surface 311. And the rotation of the first pawl element 211 is transferred to the main shaft 100 through the countershaft 210, thus driving the main shaft 100 to rotate.

[0038] Meanwhile, when the moving direction of the second ratchet surface 321 beside the first fan-shaped pawl of the second pawl element 212 is from the first fan-shaped section to the second fan-shaped section in the second pawl element 212, namely the second ratchet surface 321 rotates clockwise, since the ball-head section of the second spring-loaded plunger 222 connects with the first side wall of the concave section of the second pawl element 212, the second ratchet surface 321 cannot drive the second pawl element 212 to rotate, namely the tooth of the first fan-shaped pawl of the second pawl element 212 does not engage with the tooth of the second ratchet surface 321; but when the moving direction of the second ratchet surface 321 beside the first fan-shaped pawl of the second pawl element 212 is from the second fan-shaped section to the first fan-shaped section in the second pawl element 212, namely the second ratchet surface 321 rotates anticlockwise, since the ball-head section of the second spring-loaded plunger 222 connects with the first side wall of the concave section of the second pawl element 212, the second ratchet surface 321 can drive the second pawl element 212 to rotate, namely the tooth of the first fan-shaped pawl of the second pawl element 212 engages with the tooth of the second ratchet surface 321. And the rotation of the second pawl element 212 is transferred to the main shaft 100 through the countershaft 210, thus driving the main shaft 100 to rotate.

[0039] Since the drive among the idle gear 331, 332, the capstan gear 312 and the follower gear 322, when the holding ring is fixed, the rotation direction of the second ratchet surface 321 is opposite to the first ratchet surface 311. It can be seen from this, when the bidirectional wrench of the present invention is on the first working mode, when the input torque from the working part 10 is a clockwise torque, it makes the first ratchet surface 311 rotate clockwise and the second ratchet surface 321 rotate anticlockwise, the first pawl element 211 does not engage with the first ratchet surface 311 and the second pawl element 212 engages with the second ratchet surface 321 at the moment, thus the second pawl element 212 drives the main shaft 100 to rotate anticlockwise and the output torque is an anticlockwise torque; when the input torque from the working part 10 is an anticlockwise torque, it makes the first ratchet 311 rotate anticlockwise and the second ratchet surface 321 rotate clockwise, the first pawl element 211 engages with the first ratchet surface 311 and the second pawl element 212 does not engage with the second ratchet surface 321 at the moment, thus the first pawl element 211 drives the main shaft 100 to rotate anticlockwise and the output torque is an anticlockwise torque.

[0040] When the bidirectional wrench of the present invention is on the second working mode, the tooth of the second fan-shaped pawl 2112 of the first pawl element 211 connects with the tooth of the first ratchet surface 311, similarly, the tooth of the second fan-shaped pawl of the second pawl element 212 connects with the tooth of the second ratchet surface 321. When the head 21 of the handle 20 drives the first ratchet surface 311 to rotate, when the moving direction of the first ratchet surface 311 beside the second fan-shaped pawl 2112 is from the first fan-shaped section 2111 to the second fan-shaped section 2112, namely the first ratchet surface 311 rotates clockwise, since the ball-head section of the first spring-loaded plunger 221 connects with the second side wall 2115 of the concave section 2113 of the first pawl element 211, the first ratchet surface 311 can drive the first pawl element 211 to rotate, namely the tooth of the second fan-shaped pawl 2112 engages with the tooth of the first ratchet surface 311; and the rotation of the first pawl element 211 is transferred to the main shaft 100 through the countershaft 210, thus driving the main shaft 100 to rotate; but when the moving direction of the first ratchet surface 311 beside the second fan-shaped pawl 2112 is from the second fan-shaped section 2112 to the first fan-shaped section 2111, namely the first ratchet surface 311 rotates anticlockwise, since the ball-head section of the first spring-loaded plunger 221 connects with the second side wall 2115 of the concave section 2113 of the first pawl element 211, the first ratchet surface 311 cannot drive the first pawl element 211 to rotate, namely the tooth of the second fan-shaped pawl 2112 does not engage with the tooth of the first ratchet surface 311.

[0041] Meanwhile, when the moving direction of the second ratchet surface 321 beside the second fan-shaped pawl of the second pawl element 212 is from the first fan-shaped section to the second fan-shaped section in the second pawl element 212, namely the second ratchet surface 321 rotates clockwise, since the ball-head section of the second spring-loaded plunger 222 connects with the second side wall of the concave section of the second pawl element 212, the second ratchet surface 321 can drive the second pawl element 212 to rotate, namely the tooth of the second fan-shaped pawl of the second pawl element 212 engages with the tooth of the second ratchet surface 321; and the rotation of the second pawl element 212 is transferred to the main shaft 100 through the countershaft 210, thus driving the main shaft 100 to rotate. But when the moving direction of the second ratchet surface 321 beside the second fan-shaped pawl of the second pawl element 212 is from the second fan-shaped section to the first fan-shaped section in the second pawl element 212, namely the second ratchet surface 321 rotates anticlockwise, since the ball-head section of the second spring-loaded plunger 222 connects with the second side wall of the concave section of the second pawl element 212, the second ratchet surface 321 cannot drive the second pawl element 212 to rotate, namely the tooth of the second fan-shaped pawl of the second pawl element 212 does not engage with the tooth of the f second ratchet surface 321.

[0042] Since the drive among the idle gear 331, 332, the driving gear 312 and the driven gear 322, when the holding ring is fixed, the rotation direction of the second ratchet surface 321 is opposite to the first ratchet surface 311. It can be seen from this, when the bidirectional wrench of the present invention is on the second working mode, when the input torque from the working part 10 is a clockwise torque, it makes the first ratchet surface 311 rotate clockwise and the second ratchet surface 321 rotate anticlockwise, the first pawl element 211 engages with the first ratchet surface 311 and the second pawl element 212 does not engage with the second ratchet surface 321 at the moment, thus the first pawl element 211 drives the main shaft 100 to rotate clockwise and the output torque is a clockwise torque; when the input torque from the working part 10 is an anticlockwise torque, it makes the first ratchet 311 rotate anticlockwise and the second ratchet surface 321 rotate clockwise, the first pawl element 211 does not engage with the first ratchet surface 311 and the second pawl element 212 engages with the second ratchet surface 321 at the moment, thus the second pawl element 212 drives the main shaft 100 to rotate clockwise and the output torque is a clockwise torque.

[0043] As previously mentioned, the first working mode and the second working of the bidirectional wrench of the present invention can be switched and selected via the newel 220. To be convenient, in this embodiment, as shown in Figure 8, the first end of the newel 220 has a knob 223, which would be matched with the newel 220 by embedding the two ears (ear 2201 in Figure 8) of the newel 220 into the knob 223. In this way, the newel 220 will rotate when turning the knob 223. In this embodiment, two spines protrude out of the surface of the knob 223, such as spine 2231, turning of the knob 223 can be achieved by putting rotating torque on the two spines including the spine 2231.

[0044] The bidirectional wrench of the present invention also contains a blocking device, which keeps the bidirectional wrench of the present invention on the working mode selected until the operator switch it to the other mode artificially. In Figure 9 and 10, the blocking device in this embodiment consists of a ball 400 disposed between the output end 101 and the second end of the newel 220, a groove matched with the ball 400 on the second end of the newel 220, specifically, the first groove 410 and the second groove 420. The first groove 410 and the second groove 420 are parallel with each other and are separated by the smooth spine.

[0045] When the ball 400 is in the first groove 410, the head working part of the first spring-loaded plunger 221 and the second spring-loaded plunger 222 keeps connecting with the first side wall of the concave section of the first pawl element 211 and the second pawl element 212 respectively, namely the first working mode of the bidirectional wrench of the present invention; when the ball 400 is in the second groove 420, the head working part of the first spring-loaded plunger 221 and the second spring-loaded plunger 222 keeps connecting with the second side wall of the concave section of the first pawl element 211 and the second pawl element 212 respectively, namely the second working mode of the bidirectional wrench of the present invention. When turning the knob 223 to rotate the newel 220 and let the ball 400 move from the first groove 410 to the second groove 420, the bidirectional wrench of the present invention turns from the first working mode to the second working mode; when turning the knob 223 to rotate the newel 220 and let the ball 400 move from the second groove 420 to the first groove 410, the bidirectional wrench of the present invention turns from the second working mode to the first working mode. In this embodiment, the transmission seat 330 engages with the holding ring 102 constantly, the transmission seat 330 is fixed with respect to the holding ring 102, thus when the working part 20 rotates with respect to the holding ring 102, the idle gear 331, 332 makes the follower gear 322 and the capstan 312 rotate in the opposite direction. In use, to keep the idle gear 331, 332 working and make sure that the second ratchet surface 321 and the first ratchet surface 311 rotate in the opposite direction, operator can orientate the transmission seat 330 by holding the holding ring 102, thus the capstan gear 312 drives the idle gear 331, 332 to rotate, and then drives the follower gear 322 to rotate, thereby making the second ratchet surface 321 and first ratchet surface 311 rotate in the opposite direction. It should be noted that in other embodiments of the present invention, other methods can also be taken to position the transmission seat 330 and thus drive the idle gear 331, 332 to work.

[0046] In addition, as described previously, the output end 101 of the bidirectional wrench of the present invention can be a component, which is suitable to operate various fasteners such as quoining screw, by mounting various sleeves, and the ball 400 in the blocking device can also be used to block the various sleeves which are mounted on the output end 101 at this moment.

Claims

1. A bidirectional wrench, comprising a working part (10) and a handle (20), characterized in that the working part (10) comprises
a main shaft (100), which is used to output torque and whose axis is perpendicular to the handle (20);
a capstan gear (312), a follower gear (322), an transmission seat (330) and an idle gear (331, 332), the capstan gear (312), the follower gear (322) and the transmission seat (330) being all mounted on the main shaft (100), and the idle gear (331, 332) being mounted on the transmission seat (330) and rotating between the capstan gear (312) and the follower gear (322), wherein
the handle (20) entrains the capstan gear (312) to rotate, and the transmission seat (330) is equipped with a holding device, when holding the holding device and rotating the handle (20) to entrain the capstan gear (312), the capstan gear (312) entraining the follower gear (322) to rotate reversely via the idle gear (331, 332);
a first ratchet surface (311) rotating together with the capstan gear (312), and a second ratchet surface (321) rotating together with the follower gear (322);
a first pawl element (211) and a second pawl element (212) which are capable of driving the main shaft (100) to rotate; wherein
the first pawl element (211) has a first pawl (2111) and a second pawl (2112) which are matched with the first ratchet surface (311) selectively, wherein the first pawl (2111) skids on the first ratchet surface (311) in the first direction but engages with the first ratchet surface (311) in the second direction, and the second pawl (2112) engages with the first ratchet surface (311) in the first direction but skids on the first ratchet surface (311) in the second direction;
the second pawl element (212) has a third pawl and a forth pawl which are matched with the second ratchet surface (321) selectively, wherein the third pawl skids on the second ratchet surface (321) in the first direction but engages with the second ratchet surface (321) in the second direction, and the forth pawl engages with the second ratchet surface (321) in the first direction but skids on the second ratchet surface (321) in the second direction;
a reversing switch, which is capable of setting the first pawl element (211) and the second pawl element (212) on a first condition and a second condition, the first pawl (2111) and the third pawl being matched with the first ratchet surface (311) and the second ratchet surface (321) respectively under the first condition; the second pawl (2112) and the forth pawl being matched with the first ratchet surface (311) and the second ratchet surface (321) respectively under the second condition;
the reversing switch comprises a newel (220), the newel (220) being disposed inside the main shaft (100); one end of the main shaft (100) is an output end (101) which extends beyond a head (21) of the handle (20);
the first direction being clockwise or anticlockwise, and the second direction being counter to the first direction.

2. The bidirectional wrench as claimed in claim 1, wherein, the handle (20) has a ring-shaped head (21), and the first ratchet surface (311) is disposed on the inner circumference of the ring-shaped head (21).

3. The bidirectional wrench as claimed in claim 1, wherein, the first ratchet surface (311) is disposed on the inner circumference of the capstan gear (312).

4. The bidirectional wrench as claimed in claim 1, wherein, the second ratchet surface (321) is disposed on the inner circumference of the follower gear (322).

5. The bidirectional wrench as claimed in claim 1, wherein, the holding device is a holding ring (102).

6. The bidirectional wrench as claimed in claim 1, wherein, the first pawl element (211) and/or the second pawl element (212) are/is fan-shaped.

7. The bidirectional wrench as claimed in claim 1, wherein, the first pawl element (211) and the second pawl element (212) are mounted on the countershaft (210), the axis of the countershaft (210) is parallel to but not overlap in the main shaft (100), and the countershaft (210) engages with the main shaft (100) and is capable of entraining the main shaft (100) to rotate.

8. The bidirectional wrench as claimed in claim 7, wherein, the countershaft (210) drills through the main shaft (100).

9. The bidirectional wrench as claimed in claim 1, wherein, the reversing switch further comprises a first spring-loaded plunger (221) and a second spring-loaded plunger (222), the first spring-loaded plunger (221) and the second spring-loaded plunger (222) being fix on the newel (220) in turn, and the first spring-loaded plunger (221) and the second spring-loaded plunger (222) being matched with the first pawl element (211) and the second pawl element (212) respectively.

10. The bidirectional wrench as claimed in claim 9, wherein, springs are disposed inside the first spring-loaded plunger (221) and the second spring-loaded plunger (222).

11. The bidirectional wrench as claimed in claim 9, wherein
the first pawl element (211) matched with the first spring-loaded plunger (221) has a first special shaped surface comprising a first concave section (2113) having a first side wall (2114) and a second side wall (2115);
the second pawl element (212) matched with the second spring-loaded plunger (222) has a second special shaped surface comprising a second concave section having a third side wall and a fourth side wall;
under the first condition, the first spring-loaded plunger (221) connects with the first side wall (2114) and the second spring-loaded plunger (222) connects with the third side wall;
under the second condition, the first spring-loaded plunger (221) connects with the second side wall (2115) and the second spring-loaded plunger (222) connects with the fourth side wall.

12. The bidirectional wrench as claimed in claim 9, wherein the wrench comprises a knob (223) and the newel (220) comprises two ears (2201) arranged to be embedded into the knob (223), the knob (223) being matched with the newel (220).

13. The bidirectional wrench as claimed in claim 1, wherein the bidirectional wrench comprises a blocking device arranged to keep the bidirectional wrench on the working mode selected until being switched to other mode, the blocking device comprises:

a ball (400) disposed between an output end (101) of the main shaft (100) and the newel (220);

a groove, configured to be able to be matched with the ball (400), comprising a first groove (410) and a second groove (420).

14. The bidirectional wrench as claimed in claim 1, wherein the number of the idle gears (331, 332) is two, the idle gears (331, 332) mounted on an axis of the transmission seat (330) that is perpendicular to the axis of the main shaft (100), wherein the idle gears (331, 332) respectively face to each other.

15. The bidirectional wrench as claimed in claim 1, wherein the capstan gear (312) and the follower gear (322) are face-gears, faces of the capstan gear (312) and the follower gear (322) being face to face, the idle gear (331, 332) being angle gears.

Ansprüche

1. Bidirektionaler Schraubenschlüssel, umfassend einen Arbeitsteil (10) und einen Griff (20), dadurch gekennzeichnet, dass der Arbeitsteil (10) Folgendes umfasst:

eine Hauptwelle (100), die zum Ausgeben von Drehmoment verwendet wird und deren Achse senkrecht zum Griff (20) steht;

ein Antriebszahnrad (312), ein Mitlaufzahnrad (322), einen Übersetzungssitz (330) und ein Zwischenrad (331, 332), wobei das Antriebszahnrad (312), das Mitlaufzahnrad (322) und der Übersetzungssitz (330) alle auf der Hauptwelle (100) angebracht sind und das Zwischenrad (331, 332) auf dem Übersetzungssitz (330) angebracht ist und sich zwischen dem Antriebszahnrad (312) und dem Mitlaufzahnrad (322) dreht, wobei

der Griff (20) das Antriebszahnrad (312) mitnimmt, um es zu drehen, und der Übersetzungssitz (330) mit einer Haltevorrichtung ausgestattet ist, wobei das Antriebszahnrad (312), wenn die Haltevorrichtung gehalten wird und der Griff (20) gedreht wird, das Antriebszahnrad (312) das Mitlaufzahnrad (322) zum umgekehrten Drehen über das Zwischenrad (331, 332) mitnimmt;

eine erste Sperrradoberfläche (311), die sich zusammen mit dem Antriebszahnrad (312) dreht, und eine zweite Sperrradoberfläche (321), die sich zusammen mit dem Mitlaufzahnrad (322) dreht;

ein erstes Sperrklinkenelement (211) und ein zweites Sperrklinkenelement (212), die zum Antreiben der Hauptwelle (100) zur Drehung in der Lage sind; wobei

das erste Sperrklinkenelement (211) eine erste Sperrklinke (2111) und eine zweite Sperrklinke (2112) aufweist, die selektiv an die erste Sperrradoberfläche (311) angepasst sind, wobei die erste Sperrklinke (2111) in der ersten Richtung über die erste Sperrradoberfläche (311) gleitet, aber in der zweiten Richtung mit der ersten Sperrradoberfläche (311) eingreift, und die zweite Sperrklinke (2112) in der ersten Richtung mit der ersten Sperrradoberfläche (311) eingreift, aber in der zweiten Richtung über die erste Sperrradoberfläche (311) gleitet;

das zweite Sperrklinkenelement (212) eine dritte Sperrklinke und eine vierte Sperrklinke aufweist, die selektiv an die zweite Sperrradoberfläche (321) angepasst sind, wobei die dritte Sperrklinke in der ersten Richtung über die zweite Sperrradoberfläche (321) gleitet, aber in der zweiten Richtung mit der zweiten Sperrradoberfläche (321) eingreift, und die vierte Sperrklinke in der ersten Richtung mit der zweiten Sperrradoberfläche (321) eingreift, aber in der zweiten Richtung über die zweite Sperrradoberfläche (321) gleitet;

einen Umkehrschalter, der zum Versetzen des ersten Sperrklinkenelements (211) und des zweiten Sperrklinkenelements (212) in einen ersten Zustand und einen zweiten Zustand in der Lage ist, wobei die erste Sperrklinke (2111) und die dritte Sperrklinke im ersten Zustand an die erste Sperrradoberfläche (311) bzw. die zweite Sperrradoberfläche (321) angepasst sind; die zweite Sperrklinke (2112) und die vierte Sperrklinke im zweiten Zustand an die erste Sperrradoberfläche (311) bzw. die zweite Sperrradoberfläche (321) angepasst sind;

wobei der Umkehrschalter eine Spindel (220) umfasst, wobei die Spindel (220) im Inneren der Hauptwelle (100) angeordnet ist; ein Ende der Hauptwelle (100) ein Ausgangsende (101) ist, das sich über einen Kopf (21) des Griffs (20) hinaus erstreckt;

wobei die erste Richtung im Uhrzeigersinn oder gegen den Uhrzeigersinn ist und die zweite Richtung der ersten Richtung entgegengesetzt ist.

2. Bidirektionaler Schraubenschlüssel nach Anspruch 1, wobei der Griff (20) einen ringförmigen Kopf (21) aufweist und die erste Sperrradoberfläche (311) auf dem Innenumfang des ringförmigen Kopfs (21) angeordnet ist.

3. Bidirektionaler Schraubenschlüssel nach Anspruch 1, wobei die erste Sperrradoberfläche (311) auf dem Innenumfang des Antriebszahnrads (312) angeordnet ist.

4. Bidirektionaler Schraubenschlüssel nach Anspruch 1, wobei die zweite Sperrradoberfläche (321) auf dem Innenumfang des Mitlaufzahnrads (322) angeordnet ist.

5. Bidirektionaler Schraubenschlüssel nach Anspruch 1, wobei die Haltevorrichtung ein Haltering (102) ist.

6. Bidirektionaler Schraubenschlüssel nach Anspruch 1, wobei das erste Sperrklinkenelement (211) und/oder das zweite Sperrklinkenelement (212) fächerförmig ist/sind.

7. Bidirektionaler Schraubenschlüssel nach Anspruch 1, wobei das erste Sperrklinkenelement (211) und das zweite Sperrklinkenelement (212) auf der Zwischenwelle (210) angebracht sind, wobei die Achse der Zwischenwelle (210) parallel zur Hauptwelle (100) verläuft, diese aber nicht überlappt, und die Zwischenwelle (210) mit der Hauptwelle (100) in Eingriff steht und zum Mitnehmen der Hauptwelle (100) zur Drehung in der Lage ist.

8. Bidirektionaler Schraubenschlüssel nach Anspruch 7, wobei die Zwischenwelle (210) die Hauptwelle (100) durchbohrt.

9. Bidirektionaler Schraubenschlüssel nach Anspruch 1, wobei der Umkehrschalter ferner einen ersten federbelasteten Druckbolzen (221) und einen zweiten federbelasteten Druckbolzen (222) umfasst, wobei der erste federbelastete Druckbolzen (221) und der zweite federbelastete Druckbolzen (222) abwechselnd an der Spindel (220) fixiert sind und der erste federbelastete Druckbolzen (221) und der zweite federbelastete Druckbolzen (222) an das erste Sperrklinkenelement (211) bzw. das zweite Sperrklinkenelement (212) angepasst sind.

10. Bidirektionaler Schraubenschlüssel nach Anspruch 9, wobei im Inneren des ersten federbelasteten Druckbolzens (221) und des zweiten federbelasteten Druckbolzens (222) Federn angeordnet sind.

11. Bidirektionaler Schraubenschlüssel nach Anspruch 9, wobei
das erste Sperrklinkenelement (211), das an den ersten federbelasteten Druckbolzen (221) angepasst ist, eine erste speziell geformte Oberfläche aufweist, die einen konkaven Abschnitt (2113) mit einer ersten Seitenwand (2114) und einer zweiten Seitenwand (2115) umfasst;
das zweite Sperrklinkenelement (212), das an den zweiten federbelasteten Druckbolzen (222) angepasst ist, eine zweite speziell geformte Oberfläche aufweist, die einen zweiten konkaven Abschnitt mit einer dritten Seitenwand und einer vierten Seitenwand umfasst;
in dem ersten Zustand der erste federbelastete Druckbolzen (221) sich mit der ersten Seitenwand (2114) verbindet und der zweite federbelastete Druckbolzen (222) sich mit der dritten Seitenwand verbindet;
in dem zweiten Zustand der erste federbelastete Druckbolzen (221) sich mit der zweiten Seitenwand (2115) verbindet und der zweite federbelastete Druckbolzen (222) sich mit der vierten Seitenwand verbindet.

12. Bidirektionaler Schraubenschlüssel nach Anspruch 9, wobei der Schraubenschlüssel einen Knopf (223) umfasst und die Spindel (220) zwei Nasen (2201) umfasst, die so angeordnet sind, dass sie in dem Knopf (223) eingebettet sind, wobei der Knopf (223) an die Spindel (220) angepasst ist.

13. Bidirektionaler Schraubenschlüssel nach Anspruch 1, wobei der bidirektionale Schraubenschlüssel eine Blockiervorrichtung umfasst, die angeordnet ist, um den bidirektionalen Schraubenschlüssel im ausgewählten Arbeitsmodus zu halten, bis in einen anderen Modus gewechselt wird, wobei die Blockiervorrichtung Folgendes umfasst:

eine Kugel (400), die zwischen einem Ausgangsende (101) der Hauptwelle (100) und der Spindel (220) angeordnet ist;

eine Nut, die konfiguriert ist, um zur Anpassung an die Kugel (400) in der Lage zu sein, umfassend einen erste Nut (410) und eine zweite Nut (420).

14. Bidirektionaler Schraubenschlüssel nach Anspruch 1, wobei die Anzahl der Zwischenräder (331, 332) zwei beträgt, wobei die Zwischenräder (331, 332) auf einer Achse des Übersetzungssitzes (330) angebracht sind, die senkrecht zu der Achse der Hauptwelle (100) steht, wobei die Zwischenräder (331, 332) einander jeweils zugewandt sind.

15. Bidirektionaler Schraubenschlüssel nach Anspruch 1, wobei das Antriebszahnrad (312) und das Mitlaufzahnrad (322) Zahnräder mit Stirnverzahnung sind, wobei Stirnseiten des Antriebszahnrads (312) und des Mitlaufzahnrads (322) einander gegenüberliegen, wobei die Zwischenräder (331, 332) Winkelräder sind.

Revendications

1. Clé bidirectionnelle comprenant une partie de travail (10) et une poignée (20), caractérisée en ce que la partie de travail (10) comprend :

un arbre principal (100) qui est utilisé pour produire le couple et dont l'axe est perpendiculaire à la poignée (20) ;

une roue dentée de cabestan (312), un engrenage mené (322), un siège de transmission (330) et une roue dentée folle (331, 332), la roue dentée de cabestan (312), l'engrenage mené (322) et le siège de transmission (330) étant tous montés sur l'arbre principal (100), et la roue dentée folle (331, 332) étant montée sur le siège de transmission (330) et tournant entre la roue dentée de cabestan (312) et l'engrenage mené (322), dans laquelle :

la poignée (20) entraîne la roue dentée de cabestan (312) à tourner, et le siège de transmission (330) est équipé d'un dispositif de maintien, lors du maintien du dispositif de maintien et de la rotation de la poignée (20), pour entraîner la roue dentée de cabestan (312), la roue dentée de cabestan (312) entraînant l'engrenage mené (322) à tourner en sens inverse via la roue dentée folle (331, 332) ;

une première surface de rochet (311) tournant conjointement avec la roue dentée de cabestan (312), et une seconde surface de rochet (321) tournant conjointement avec l'engrenage mené (322) ;

un premier élément de cliquet (211) et un second élément de cliquet (212) qui peuvent entraîner l'arbre principal (100) à tourner ; dans laquelle :

le premier élément de cliquet (211) a un premier cliquet (2111) et un deuxième cliquet (2112) qui correspondent à la première surface de rochet (311) sélectivement, dans laquelle le premier cliquet (2111) glisse sur la première surface de rochet (311) dans la première direction mais se met en prise avec la première surface de rochet (311) dans la seconde direction, et le deuxième cliquet (2112) se met en prise avec la première surface de rochet (311) dans la première direction mais glisse sur la première surface de rochet (311) dans la seconde direction ;

le second élément de cliquet (212) a un troisième cliquet et un quatrième cliquet qui correspondent à la seconde surface de rochet (321) sélectivement, dans lequel le troisième cliquet glisse sur la seconde surface de rochet (321) dans la première direction mais se met en prise avec la seconde surface de rochet (321) dans la seconde direction, et le quatrième cliquet se met en prise avec la seconde surface de rochet (321) dans la première direction mais glisse sur la seconde surface de rochet (321) dans la seconde direction ;

un commutateur d'inversion qui peut régler le premier élément de cliquet (211) et le second élément de cliquet (212) sur une première condition et une seconde condition, le premier cliquet (2111) et le troisième cliquet correspondant à la première surface de rochet (311) et à la seconde surface de rochet (321) respectivement dans la première condition ; le deuxième cliquet (2112) et le quatrième cliquet correspondant à la première surface de rochet (311) et à la seconde surface de rochet (321) respectivement dans la seconde condition ;

le commutateur d'inversion comprend un noyau (220), le noyau (220) étant disposé à l'intérieur de l'arbre principal (100) ; une extrémité de l'arbre principal (100) est une extrémité de sortie (101) qui s'étend au-delà d'une tête (21) de la poignée (20) ;

la première direction étant dans le sens des aiguilles d'une montre ou dans le sens inverse des aiguilles d'une montre, et la seconde direction étant opposée à la première direction.

2. Clé bidirectionnelle selon la revendication 1, dans laquelle la poignée (20) a une tête de forme annulaire (21), et la première surface de rochet (311) est disposée sur la circonférence interne de la tête de forme annulaire (21).

3. Clé bidirectionnelle selon la revendication 1, dans laquelle la première surface de rochet (311) est disposée sur la circonférence interne de la roue dentée de cabestan (312).

4. Clé bidirectionnelle selon la revendication 1, dans laquelle la seconde surface de rochet (321) est disposée sur la circonférence interne de l'engrenage mené (322).

5. Clé bidirectionnelle selon la revendication 1, dans laquelle le dispositif de maintien est une bague de maintien (102).

6. Clé bidirectionnelle selon la revendication 1, dans laquelle le premier élément de cliquet (211) et/ou le second élément de cliquet (212) sont/est en forme d'éventail.

7. Clé bidirectionnelle selon la revendication 1, dans laquelle le premier élément de cliquet (211) et le second élément de cliquet (212) sont montés sur l'arbre de renvoi (210), l'axe de l'arbre de renvoi (210) est parallèle à l'arbre principal (100) mais ne le chevauche pas, et l'arbre de renvoi (210) se met en prise avec l'arbre principal (100) et est capable d'entraîner l'arbre principal (100) à tourner.

8. Clé bidirectionnelle selon la revendication 7, dans laquelle l'arbre de renvoi (210) traverse l'arbre principal (100) par perçage.

9. Clé bidirectionnelle selon la revendication 1, dans laquelle le commutateur d'inversion comprend en outre un premier piston plongeur à ressort (221) et un second piston plongeur à ressort (222), le premier piston plongeur à ressort (221) et le second piston plongeur à ressort (222) étant fixés sur le noyau (220) à leur tour, et le premier piston plongeur à ressort (221) et le second piston plongeur à ressort (222) correspondant au premier élément de cliquet (211) et au second élément de cliquet (212) respectivement.

10. Clé bidirectionnelle selon la revendication 9, dans laquelle les ressorts sont disposés à l'intérieur du premier piston plongeur à ressort (221) et du second piston plongeur à ressort (222).

11. Clé bidirectionnelle selon la revendication 9, dans laquelle :

le premier élément de cliquet (211) correspondant au premier piston plongeur à ressort (221) a une première surface de forme spéciale comprenant une première section concave (2113) ayant une première paroi latérale (2114) et une deuxième paroi latérale (2115) ;

le second élément de cliquet (212) correspondant au second piston plongeur à ressort (222) a une seconde surface de forme spéciale comprenant une seconde section concave ayant une troisième paroi latérale et une quatrième paroi latérale ;

dans la première condition, le premier piston plongeur à ressort (221) se raccorde avec la première paroi latérale (2114) et le second piston plongeur à ressort (222) se raccorde avec la troisième paroi latérale ;

dans la seconde condition, le premier piston plongeur à ressort (221) se raccorde avec la deuxième paroi latérale (2115) et le second piston plongeur à ressort (222) se raccorde avec la quatrième paroi latérale.

12. Clé bidirectionnelle selon la revendication 9, dans laquelle la clé comprend un bouton (223) et le noyau (220) comprend deux oreilles (2201) agencées pour être encastrées dans le bouton (223), le bouton (223) correspondant au noyau (220).

13. Clé bidirectionnelle selon la revendication 1, dans laquelle la clé bidirectionnelle comprend un dispositif de blocage agencé pour maintenir la clé bidirectionnelle sur le mode de travail sélectionné jusqu'à ce qu'il soit commuté sur un autre mode, le dispositif de blocage comprend :

une bille (400) disposée entre une extrémité de sortie (101) de l'arbre principal (100) et le noyau (220) ;

une rainure configurée pour pouvoir correspondre à la bille (400), comprenant une première rainure (410) et une seconde rainure (420).

14. Clé bidirectionnelle selon la revendication 1, dans laquelle le nombre de roues dentées folles (331, 332) est de deux, les roues dentées folles (331, 332) sont montées sur un axe du siège de transmission (330) qui est perpendiculaire à l'axe de l'arbre principal (100), dans laquelle les roues dentées folles (331, 332) se font respectivement face.

15. Clé bidirectionnelle selon la revendication 1, dans laquelle la roue dentée de cabestan (312) et l'engrenage mené (322) sont des engrenages en vis-à-vis, les faces de la roue dentée de cabestan (312) et de l'engrenage mené (322) se faisant face, la roue dentée folle (331, 332) étant des pignons de renvoi.

Drawing