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(11) | EP 2 682 233 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
| published in accordance with Art. 153(4) EPC |
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| (54) | CLAMPING TOOL CAPABLE OF CHANGING CLAMP HANDLE ANGLE |
| (57) A clamping tool capable of changing a clamp handle angle comprises a working head
(1), a clamp handle (2) and an adjustment structure (3). The working head (1) is formed
by connecting a clamp head (1-1) and a positioning shaft (1-3) through a cover plate
(1-2), a replaceable opening mould (1-4) is installed on the clamp head (1-1), the
clamp handle (2) comprises a left clamp handle (2-1) and a right clamp handle (2-2),
a ratchet retaining mechanism (4) is installed on the clamp handle (2), and the ratched
retain-ing mechanism (4) comprises: a ratchet plate (4-2) installed at an upper clamp
handle (2-2a) of the right clamp handle (2-2) and a ratchet (4-1) installed on the
left clamp handle (2-1); the right clamp handle (2-2) comprises the upper clamp handle
(2-2a) and a lower clamp handle (2-2b) movably connected to the upper clamp handle
(2-2a) through a rotating shaft (6), and a clamp handle angle adjustment mechanism
(5) is installed on the right clamp handle (2-2). When the clamping tool works, the
clamp handle angle can be changed easily only by pulling the handle, so that the clamping
operation is very laborsaving and the efficiency of installation operations is enhanced.
Also, the clamp handle (2) is designed with a certain angle, and through the clamp
handle angle adjustment mechanism (5), the phenomenon of touch of two hands during
work is prevented. |
Field of the Invention
[0001] The present invention relates to the field of hardware tools, and particularly to a clamping tool capable of changing a clamp handle angle.
Background of the Invention
[0002] Well known PVC pipes, PEX pipes and aluminum-plastic composite pipes are widely used as transfer pipes for supplying water, oil and gas, and in the installation of such pipes, a specialized clamping plier must be used for a secure installation. As is well-known, although clamping tools for clamping pipes of a variety of specifications have appeared on the market presently, they're only suitable for the clamping operation of small-sized pipes. When they are used for clamping and connecting of large-sized pipes, it is not only very laborious and time-consuming, which reduces the efficiency of construction, but also brings a lot of inconvenience to constructors. Therefore, it has become an urgent issue to be solved in the hardware industry to design a clamping tool which is structurally reasonable, easy to operate, suitable for connecting large-sized pipes and labor saving.
Summary of the Invention
[0003] The technical problem to be solved in the present invention is to provide a clamping tool capable of changing a clamp handle angle, which has a simple structure, can improve the efficiency of construction operation , is easy to operate, and labor-saving.
[0004] The technical solution adopted in order to solve the above-mentioned technical problem is: A clamping tool capable of changing a clamp handle angle comprises a working head, a clamp handle and an adjustment structure connecting the working head and the clamp handle. The working head is formed by connecting a clamp head and a positioning shaft through a cover plate, and a replaceable opening mould is installed on the clamp head; the clamp handle comprises a left clamp handle and a right clamp handle, and a ratchet retaining mechanism is installed on the clamp handle; the ratchet retaining mechanism comprises a ratchet plate installed at an upper clamp handle of the right clamp handle and a ratchet installed on the left clamp handle; the right clamp handle comprises the upper clamp handle and a lower clamp handle movably connected to the upper clamp handle through a rotating shaft, and a clamp handle angle adjustment mechanism is installed on the right clamp handle.
[0005] Wherein, the clamp handle angle adjustment mechanism comprises: a slider component, a guide pin shaft, a compression spring and a positioning pin shaft used for the adjustment of dominant angle of the right clamp handle. The slider component consists of a main slider, a steel wire rope and a handle slider. The slider component, which is movably connected to the lower clamp handle through the guide pin shaft, is disposed within a U-shaped slot of the lower clamp handle of the right clamp handle; the positioning pin shaft is installed on the upper clamp handle of the right clamp handle; the compression spring is nested inside the steel wire rope, with one end of the compression spring connected to the main slider, and the other end abutting the spring plank.
[0006] The main slider and the handle slider are in the shape of a following-the-right-clamp-handle type and installed within the right clamp handle. A guide groove is formed on the main slider and the handle slider, through which the main slider and the handle slider slide under the action of the guide pin shaft. An adjustment handle suitable for being pulled by the human hand is formed on the lower part of the outer end of the handle slider, and a groove facilitating the adjustment of the angle of the right clamp handle is formed on the upper part of the main slider.
[0007] The lower end of the upper clamp handle of the right clamp handle is made into a bend stop part to prevent the clamp handle from opening with a too large angle.
[0008] A circular arc groove is formed on the side of the lower clamp handle of the right clamp handle to avoid an acting force produced by the guide pin shaft.
[0010] The advantage and positive effect of the present invention is: As the invention adopts the above technical solution, that is, through the ratchet retaining mechanism and the clamp handle angle adjustment mechanism on the clamp handle, the adjustment operation of the angle for opening and closing of the clamp handle can be achieved. When the clamping tool works, the clamp handle angle can be changed easily only by pulling the handle, so that the clamping operation is very labor saving and the efficiency of installation and construction is enhanced. In addition, the clamp handle is designed with a certain angle, and through the clamp handle angle adjustment mechanism, the phenomenon of touch of two hands during work is prevented.
Brief Description of the Drawings
[0011]
FIG. 1 is a schematic view of the structure of the present invention.
FIG. 2 is a schematic view of the opening initial state of the present invention;
FIG. 3 is a schematic view of the initial state of the present invention just about to work after the angle of the clamp handle is adjusted;
FIG. 4 is a schematic view of the state of the adjustment of the angle of the clamp handle, when two hands are about to touch each other during the work of the present invention.
[0012] In the drawings: 1. working head; 1-1 clamp head; 1-2. cover plate; 1-3. positioning shaft; 1-4 opening mould; 2. clamp handle; 2-1. left clamp handle; 2-2. right clamp handle; 2-2a. upper clamp handle; 2-2b. lower clamp handle; 2-3. bend stop part; 2-4. circular arc groove; 3. adjustment structure; 4. ratchet retaining mechanism; 4-1. ratchet; 4-2. ratchet plate; 5. clamp handle angle adjustment mechanism; 5-1. main slider; 5-1a. guide groove; 5-1b. adjustment handle; 5-1c. groove; 5-2. guide pin shaft; 5-3. compression spring; 5-4. positioning pin shaft; 5-5. handle slider; 5-6. steel wire rope; 5-7. spring plank; 6. rotating shaft; 8. fastener; 9. pipe; 10. pipe joint.
Detailed Description of the Invention
[0013] For a further understand of the summary, characteristics and efficacy of the present invention, the following examples hereby are exemplified and described in detail below with reference to the accompanying drawings:
As shown in FIGs. 1-4, a clamping tool capable of changing a clamp handle angle comprises a working head 1, a clamp handle 2 and an adjustment structure 3. The working head 1 is formed by connecting a clamp head 1-1 and a positioning shaft 1-3 through a cover plate 1-2, and a replaceable opening mould 1-4 is installed on the clamp head; the clamp handle 2 comprises a left clamp handle 2-1 and a right clamp handle 2-2. A ratchet retaining mechanism 4 and a clamp handle angle adjustment mechanism 5 are installed on the clamp handle; the right clamp handle 2-2 comprises the upper clamp handle 2-2a and a lower clamp handle 2-2b movably connected to the upper clamp handle 2-2a through a rotating shaft 6. The ratchet retaining mechanism 4 comprises: a ratchet plate 4-2 installed at an upper clamp handle 2-2a of the right clamp handle and a ratchet 4-1 installed on the left clamp handle. A clamp handle angle adjustment mechanism 5 is installed on the right clamp handle. The clamp handle angle adjustment mechanism comprises: a slider component, a guide pin shaft 5-2, a compression spring 5-3 and a positioning pin shaft 5-4 used for the adjustment of dominant angle of the right clamp handle. The slider component consists of a main slider 5-1, a steel wire rope 5-6, and a handle slider 5-5. The slider component, which is movably connected to the lower clamp handle through the guide pin shaft, is disposed within a U-shaped slot of the lower clamp handle of the right clamp handle; the positioning pin shaft is installed on the upper clamp handle of the right clamp handle; the compression spring is nested inside the steel wire rope, with one end of the compression spring connected to the main slider, and the other end abutting the spring plank 5-7.
[0014] The main slider 5-1 and the handle slider 5-5 are in the shape of a following-the-right-clamp-handle type and installed within the right clamp handle. A guide groove 5-1a is formed on the main slider and the handle slider, through which the main slider and the handle slider slide under the action of the guide pin shaft. An adjustment handle 5-1b suitable for being pulled by the human hand is formed on the lower part of the outer end of the handle slider, and a groove 5-1c facilitating the adjustment of the angle of the right clamp handle is formed on the upper part of the main slider.
[0015] The lower end of the upper clamp handle of the right clamp handle is made into a bend stop part 2-3 to prevent the clamp handle from opening with a too large angle.
[0016] A circular arc groove 2-4 is formed on the side of the lower clamp handle of the right clamp handle to avoid an acting force produced by the guide pin shaft. An outward bending part is formed on the lower clamp handle of the right clamp handle.
[0017] The working principle of the present invention is:
As shown in FIG. 2, FIG. 3 and FIG. 4, when the clamping tool is in the initial opening state (FIG. 2), as the opening angle of the clamp handle 2 is too large, without the angle adjustment mechanism, a significant amount of force must be exerted by the hands holding the clamp handle to close the clamp handle. At this time, pushing the adjustment handle 5-1b and pulling down the handle slider 5-5, the main slider 5-1 driven by the steel wire rope 5-6 is detached from the side contact with the positioning pin shaft 5-4, which just falls at the groove on the right clamp handle and the main slider. Then through rotating the right clamp handle, the opening angle thereof can be decreased (FIG. 3). At this point, a force can then be easily applied to the clamp handle that has rotated with an angle to close the clamp handle through a step-by-step action of the ratchet. When the clamp handle is closed to a position where the two hands are about to touch each other (FIG. 4, position A), the right clamp handle is rotated outwardly. At this time, under the action of the compression spring 5-3, the main slider springs upwardly and the positioning pin shaft contacts the side of the main slider, which in turn makes the clamp handle open with a certain angle (FIG. 4, position B). The force application is again continued, and the fastener 8 under the clamping force makes the pipe joint 10 and pipe 9 be tightly coupled, then a connection operation may be completed. The present clamping tool is simple to operate and time-and-labor saving, which improves the efficiency of installation and construction.