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(11) | EP 1 847 354 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Torque wrench |
| (57) The present invention provides a structure of a torque wrench, which comprises a
grip handle (10), a sheathing end (20), a directional braking component (30), an overload
dislocating ring (40), a roller post (50) and a resilient component (62); the main
feature is that an overload dislocation ring is placed between the braking unit (32)
of the directional braking component (30) and the joint slot (21) of the sheathing
end (20), and its inner edge is an annular edge for the braking unit (32) of the directional
braking component (30) to lock in; and its external edge is designed to have multiple
sides (42), and a containment groove (43) is placed between the side surface for the
roller post (50), and the roller post (50) protrudes out of the opening of the containment
groove (43) and tightly touches the joint slot (21); the side surface of the overload
dislocation ring (40) is supported by the movable post (61) of the resilient component
(62).
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BACKGROUND OF INVENTION
1. Field of the Invention
[0001] The present invention relates generally to a torque wrench, and more particularly to a design that offers overload dislocation component.
2. Description of Related Art
[0002] So as to prevent the structure being damaged by the unbearable outside force, the torque wrench usually has overload protection measures, so that when the end of grip handle of the torque wrench exceeds the pre-determined value, its sheath and the end of grip handle will create dislocation to prevent the users from damaging the structure; as for the conventional structure of the overload protection measure mentioned herein, one of the typical one is one that has a ratchet ring inside the slot on one end of the torque wrench, and the inner edge of the ratchet ring provides the supporting surface when the sheath is turned clockwise or counterclockwise, and one side of the outer edge of the ratchet ring is positioned and supported by a resilient bearing; with this structural design, when the end of grip handle of the torque wrench exceeds the pre-determined value, the sheath will drive the ratchet on the outside of the ratchet ring cross the resilient bearing, so that the sheath and the end of grip handle will create dislocation to prevent the damage. However, during the process when the ratchet part of the ratchet ring is crossing over the resilient bearing, because the conventional structure is pointed, which creates the fraction between the slots of the torque wrench, hence, it also damages the ratchet shape of the ratchet ring, and reduce the value of the overload protection of the handle of the force end, and greatly shortens the life span of the torque wrench. Because the fraction is serious, which causes inaccurate torque value, it is not an ideal structure; moreover, another conventional structure of the overload protection measure is to place it inside the middle section of the end of grip handle; the principle is to use the dislocation between the two components to achieve the protective purposes. However, with this conventional structure design, if the user continues to apply force when the dislocation occurs, one of the components will further hit the structure of the handle and create damages.
[0003] Thus, to overcome the aforementioned problems of the prior art, it would be an advancement if the art to provide an improved structure that can significantly improve the efficacy.
[0004] To this end, the inventor has provided the present invention of practicability after deliberate design and evaluation based on years of experience in the production, development and design of related products.
SUMMARY OF THE INVENTION
[0005] The improved fact of the present invention is described as followed:
1. It provides an overload dislocation ring 40 that has multiple sides, and a containment groove 43 is placed between the side surfaces 42 for the roller post 50. It is the first seen in the industry.
2. Through the special improved structure, when the overload dislocation ring 40 dislocates, the roller post 50 and the joint slot 21 is rolling and touching each other, which greatly reduces the fraction between the components to prevent damage and disfigure its shape, and extends the component's shelf life.
3. The structural feature of the roller post 50 and the joint slot 21 makes the dislocation of the overload dislocation ring 40 smoother, hence, the prediction of the torque value is more accurate.
4. The design of multiple sides of the overload dislocation ring 40. Every time the torque wrench dislocates, the support unit 63 of the movable post 61 will cross a set of the roller post 50 to form resilient withdraw followed by protruding out against the nest side surface 42 before returning to the original state. Therefore, even though the torque wrench of the present invention continue to have dislocating motion, however, the force of the supporting unit 63 is in the cycle of tightening and loosening, hence, it would not cause the structural damage, which is more durable and practical.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006]
FIG. 1 shows a perspective view of the torque wrench of the present invention.
FIG. 2 shows an exploded perspective view of the internal structure of the torque wrench of the present invention.
FIG. 3 shows a horizontal cutaway view of the internal structure of the present invention.
FIG. 4 shows a vertical cutaway view of the internal structure of the present invention.
FIG. 5 shows the overload state of the torque wrench of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0007] The features and the advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of a preferred embodiment of the present invention with reference to the accompanying drawings.
[0008] As shown in FIGS. 1~4, a preferred embodiment of an improved structure of a torque wrench, which comprising
a grip handle grip handle 10, which has a hollow hole 11 inside;
a sheathing end 20, which is placed on one end of the grip handle 10 mentioned above, and it has a joint slot 21 and a through hole 22 is placed on one side of the joint slot, and the joint slot 21 is interconnected with the hollow hole 11 toward one side of the grip handle 10;
a directional braking component 30, which is placed inside the joint slot 21 of the sheathing end 20, and it includes a column 31, a braking unit 31 and a controlling unit 33; and the column 31 is usually a block shape, in terms of the figure, the column 31 can be extended from the top side of the joint slot 21 through the through hole 22 down, and the bottom of the joint slot 21 is limited by a space 34 and a C hook 35, and the braking unit 32 can be placed in the middle of the directional braking component 30, and there are many types, such as a double swing type mentioned in the present invention, and clockwise/counterclockwise braking edges 321 322 are placed on both ends, and the controlling unit 33 can be placed on the top of the directional braking component 30, which can a button type, so that the user may manually adjust the direction (which is clockwise/counterclockwise braking edge) of the braking unit 32.
an overload dislocation ring 40, which is placed between the braking unit 32 of the directional braking component 30 and the joint slot 21, and the inner edge of the overload dislocation ring is the annular edge 41, which can be controlled by the clockwise braking edge 321 or the counterclockwise braking edge 322 of the braking unit 32 of the directional braking component 30, and the outside of the overload dislocation ring 40 has multiple sides, and containment groove 43 that goes through both sides is placed between the side surfaces 42, and the outside of the containment groove is the wall of the joint slot 21 facing the opening of the small end;
several predetermined roller posts 50, which are placed inside the containment groove 43 outside the overload dislocation ring 40, and the outside of the roller post 50 is protruding out of the opening of the containment groove 43 so that it can touch the wall of the joint slot 21 tightly;
a resilient component 60, which is inside the hollow hole 11 of the grip handle 10, which includes a movable post 61 and a resilient component 62, among them, the first end of the movable post 61 is supported by the resilience of the resilient component 62, and the resilient component 62 of the embodiment is a spiral spring 21, and a support unit 63 is placed on the second end of the movable post 61 that goes through the joint slot 21 of the sheathing end 20, which is pushing against a side surface 42 corresponding to the outside of the overload dislocation ring 40, and by so doing to create controlling effect (keep it from turning) for the overload dislocation.
[0009] Among them, as shown in FIG. 3, the side surfaces of the multiple sides of the overload dislocation ring 40 can be flat and straight shape.
[0010] Through the above structure and design, under the normal condition, the side surface 42 of the overload dislocation ring 40 can be supported resilient by the support unit 63 of the movable post 61, and this resilient value is taken from the resilient force of the resilient component 62, and under normal condition, the supporting force of the support unit 63 is sufficient to drive the overload dislocation ring 40 synchronously, which drives the column 31 of the directional braking component 30 to tighten or loose the screw and bolt; however, when the resistant force created by the tightness of the screw and bolt exceeds the fixed force of the overload dislocation ring 40, the overload dislocation ring 40 will be driven by the column, at the same time, because of the outside edge of the overload dislocation ring 40 rolls over the joint slot 21 of the roller post 50 and the sheathing end 20, which causes the overload dislocation ring 40 to create the motion in the joint slot 21, when it is turning, the supporting unit 63 of the movable post 61 will touch a set of the roller post 50 from the side surface 42 that was pushed against the overload dislocation ring 40(as shown in FIG. 5), and then touch the next side surface 42 and back to the position shown in FIG. 3.
a grip handle grip handle, which has a hollow hole inside;
a sheathing end, which is placed on one end of the grip handle mentioned above, and it has a joint slot and a through hole is placed on one side of the joint slot, and the joint slot is interconnected with the hollow hole toward one side of the grip handle;
a directional braking component, which is placed inside the joint slot of the sheathing end, and it includes a column, a braking unit and a controlling unit; among them, the column can be extended from the through hole of the joint slot, and the controlling unit can use it to adjust the direction of the braking unit;
an overload dislocation ring, which is placed between the braking unit of the directional braking component and the joint slot, and the inner edge of the overload dislocation ring has annular edge for the braking unit; the outside of the overload dislocation ring has multiple sides, and a containment groove that goes through both sides are placed between the side surfaces, and the outside of the containment groove has joint slot that faces the opening of the small end;
predetermined roller post, which is placed inside the containment groove outside the overload dislocation ring, and the outside of the roller post is protruding out of the opening of the containment groove so that it can touch the wall of the joint slot tightly;
a resilient component, which is inside the hollow hole of the grip handle, which includes a movable post and a resilient component, among them, the first end of the movable post is supported by the resilience of the resilient component, and the resilient component of the embodiment is a spiral spring , and a support unit is placed on the second end of the movable post that goes through the joint slot of the sheathing end, which is pushing against a side surface corresponding to the outside of the overload dislocation ring, and by so doing to create controlling effect for the overload dislocation ring.