JP4030034B2 - Ratchet wrench - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ratchet wrench driven by a ratchet mechanism.
[0002]
[Prior art]
As a wrench having a conventional ratchet mechanism, for example, there is a ratchet wrench disclosed in Japanese Utility Model Publication No. 1-33783. As shown in FIG. 4, the ratchet wrench 50 has a socket 53 in which a polygonal hole is formed in the inner cylinder 51 and ratchet teeth 52 are engraved in the outer cylinder. The socket 53 is rotatably supported by a cover 54 (the lower side is not shown) from above and below, and a handle 56 is pivotally attached to the base ends of both covers 54 by pins 55. The front end of the handle 56 is bifurcated from the pin 55, and the tips of both branches become ratchet claws 58 and 58 to mesh with the ratchet teeth 52 on the left and right.
[0003]
[Problems to be solved by the invention]
However, the conventional ratchet wrench 50 disclosed in the above publication is tightened by swinging the handle 56 around the pin 55 and engaging the ratchet pawls 58 and 58 with the ratchet teeth 52. Therefore, there is a problem that a sufficient swinging width is required to swing the handle 56 in order to engage the ratchet pawls 58 and 58 with the ratchet teeth 52, making it difficult to use in a narrow place. Further, in order to securely engage the ratchet pawls 58, 58 and the ratchet teeth 52, it is necessary to increase the tooth width and the tooth height of the ratchet pawl 58 and the ratchet teeth 52, so that the ratchet wrench 50 is enlarged as a whole. There was also a problem. Furthermore, if the ratchet teeth 52 are enlarged, the number of teeth engraved on the outer periphery of the cylinder is reduced. Therefore, if the swinging width of the handle is not increased, the bolts and nuts are sufficiently tightened and rotated by one swing. Can not give. Therefore, when bolts and nuts are tightened at a pinch or the like, if the conventional ratchet wrench 50 is used, the number of times that the handle is swung is increased, resulting in a large man-hour. Also, in an extremely narrow place, there is a problem that the handle cannot swing sufficiently and cannot be tightened.
[0004]
Therefore, an object of the present invention is to provide a ratchet wrench that can be used even in a narrow space without requiring a large swinging width. In addition, the ratchet pawl and ratchet teeth can be securely engaged even if the ratchet pawl and ratchet teeth are downsized, so that the entire ratchet wrench can be miniaturized and sufficient tightening force can be achieved without having to swing the handle significantly. It is to be able to demonstrate.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention that has solved the above-mentioned problems has a rotatable work holding member having ratchet teeth formed around it, and a ratchet claw that meshes with the ratchet teeth, a trigger member mounted so as to be movable forward and backward, by the trigger member in the state protruding from the base member enters the base member, of the workpiece holding member and the ratchet pawl meshes with the ratchet teeth While preventing the rotation, the trigger member is retracted from the base member, so that the ratchet pawl is separated from the ratchet teeth and the work holding member is released, and the trigger member is attached to the base member. and a biasing means for biasing in a direction to exit for the ratchet pawl, said linkage A plurality of claw members that are opened and closed are formed, and claw member urging means that urges the claw members in a closing direction is interposed between the pair of claw members, and the base member is The link mechanism has a sliding member that meshes the ratchet pawl with the ratchet teeth, and a base member that is bent between the workpiece holding member and the trigger member. A first arm that is pivotally supported by a provided support shaft and that slides the sliding member; and is pivotally attached to the first arm and connected to the trigger member, and the trigger member advances and retreats with respect to the base member. And a second arm for rotating the first arm around the support shaft, and the sliding member is fixed to both sides of the base member along an inner edge of a spacer member. A slidable arrangement in the central part, the claw member arranged outside the sliding member, a notch formed on both sides of the tip of the sliding member, and formed inside the claw member It is a ratchet wrench characterized by being configured to engage with the latched portion .
[0006]
According to the invention which concerns on Claim 1, rotation of a workpiece | work holding member is suppressed when a trigger member approachs, and a workpiece | work holding member is released when a trigger member retreats. As described above, since the rotation of the work holding member can be suppressed only by operating the trigger member without having to swing the handle, the work can be fastened without requiring a large swinging width. Therefore, the ratchet wrench according to the present invention can be fully utilized even in a narrow place.
[0008]
Further , according to the present invention, since the rotation of the work holding member is inhibited by the ratchet claws formed on the pair of claw members, the rotation of the work holding member can be reliably inhibited. For this reason, even if the ratchet pawl and the ratchet teeth are downsized, the ratchet pawl and the ratchet teeth can be reliably engaged. Therefore, it is possible to reduce the size of the entire ratchet wrench and to exert a sufficient tightening force without greatly swinging the handle.
[0010]
Further , according to the present invention, the ratchet teeth mesh with the plurality of ratchet claws, and the meshing force is dispersed, so that the workpiece holding member can be more reliably prevented from rotating. For this reason, even if the ratchet pawl and the ratchet teeth are downsized, the ratchet pawl and the ratchet teeth can be reliably engaged. Therefore, it is possible to reduce the size of the entire ratchet wrench and to exert a sufficient tightening force without greatly swinging the handle.
[0012]
Further , according to the present invention, since the base member is bent and further has a link mechanism adapted to the bending, the overall size of the ratchet wrench can be further reduced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 is an exploded perspective view of a ratchet wrench according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an enlarged plan sectional view of an essential part thereof.
[0014]
As shown in FIGS. 1 to 3, the ratchet wrench 1 according to the present invention includes a housing 4 having a substantially bowl-shaped base member 2 bent near the tip and a lid member 3 having the same shape as the base member 2. I have. In the housing 4, the base member 2 and the lid member 3 are provided on the proximal end side of the base member 2 and spacer members 4 </ b> A, 4 </ b> B, 4 </ b> C, 4 </ b> D formed in the vicinity of the bent portion on the distal end side of the base member 2. It attaches with the volt | bolts B shown in FIG. 2 via the block members 5A and 5B.
[0015]
In addition, circular openings 2a and 3a are formed at the distal ends of the base member 2 and the lid member 3, and the work holding member 11 is fitted into these openings 2a and 3a so as to be rotatable. ing. Ratchet teeth 11A are formed around the workpiece holding member 11, and a hexagonal hole 11B serving as a workpiece holding portion is formed inside the ratchet teeth 11A.
[0016]
Further, as shown in FIGS. 1 and 3, a pair of claw members 13 including a left piece 13 </ b> A and a right piece 13 </ b> B are disposed slightly on the base end side of the work holding member 11. The left piece 13A and the right piece 13B of the claw member 13 are pivotally supported so as to be rotatable with respect to the spacer members 4A and 4B fixed to the base member 2, respectively. Further, the left piece 13A and the right piece 13B are formed with a plurality of ratchet claws 12, 12,... That mesh with ratchet teeth 11A formed on the work holding member 11, respectively. Further, a spring 13C serving as a claw member urging means that urges the claw member 13 in the closing direction is disposed between the left piece 13A and the right piece 13B. Further, locking portions 13D and 13E project toward the center of the claw member 13 on the base end sides of the left piece 13A and the right piece 13B, respectively. When the claw member 13 is closed by the spring 13C, the ratchet claws 12, 12... Formed on the left piece 13A and the right piece 13B mesh with the ratchet teeth 11A formed on the work holding member 11. At the same time, when the left piece 13A and the right piece 13B are rotated to some extent in the direction in which the claw member 13 is closed, the locking portions 13D and 13E are respectively attached to the spacer members 4A and 4B to prevent them from rotating too much. It is designed to be locked.
[0017]
On the other hand, the block member 5 </ b> A provided on the base end side of the base member 2 can be moved forward and backward with respect to the base member 2 by swinging around the swing shaft 14 </ b> A provided on the base member 2. A trigger member 14 is attached. It becomes a grip part for an operator to grip the position where the trigger member 14 is attached.
[0018]
A link mechanism 20 that connects the claw member 13 and the trigger member 14 is provided between the claw member 13 and the trigger member 14 in the base member 2. The link mechanism 20 includes a sliding member 21, a first arm 22, and a second arm 23.
[0019]
The sliding member 21 is slidable along the side edges of the spacer members 4A and 4B fixed to the base member 2. As shown in FIG. 3, notches 21A and 21B are formed on both sides of the distal end portion of the sliding member 21, and these notches 21A and 21B are always engaged with the locking portions 13D and 13D of the claw member 13, respectively. It is engaged with the tip of 13E. When the sliding member 21 slides toward the distal end side of the base member 2, the notches 21 </ b> A and 21 </ b> B formed at the distal end portion of the sliding member 21 are formed at the center of the claw member 13. The parts 13D and 13E are pushed out. Then, the locking portions 13D and 13E of the left piece 13A and the right piece 13B are pushed out to the distal end portion of the sliding member 21, whereby the claw member 13 is opened.
[0020]
A pressing portion 22 </ b> A of a substantially L-shaped first arm 22 is detachably attached to the rear end portion of the sliding member 21. The bent portion 22 </ b> B of the first arm 22 is pivotally supported by a support shaft 24 provided on the base member 2, and is rotatable. Further, the tip end portion of the rod-shaped second arm 23 is pivotally supported on the other end portion 22 </ b> C of the first arm 22. The other end of the second arm 23 is connected to the trigger member 14, and the first arm 22 is swung through the second arm 23 by moving the trigger member 14 forward and backward with respect to the base member 2. Can be done.
[0021]
Further, a spring 25 that is an urging unit that urges the trigger member 14 in a direction in which the trigger member 14 is retracted with respect to the base member 2 is provided at a position slightly closer to the proximal end portion of the second arm 23 in the longitudinal center. ing. The spring 25 biases the second arm 23 toward the distal end side of the base member 2, so that the trigger member 14 is biased in a direction protruding from the base member 2. Therefore, the trigger member 14 protrudes from the housing 4 by the urging force of the spring 25 at all times, in other words, when the operator is not pressing the trigger member 14. Further, the sliding member 21 is always pushed out by the contraction force of the spring 25. Accordingly, since the sliding member 21 presses the locking portions 13D and 13E and spreads the claw member 13 in the opposite direction, the work holding member 11 is in a free state. 2, when the trigger member 14 protruding from the housing 4 enters the housing 4, the ratchet pawls 12, 12,... Are engaged with the ratchet teeth 11A and the work holding member 11 rotates. Suppress movement. 2, when the trigger member 14 retreats from the housing 4, the ratchet claws 12, 12... Are separated from the ratchet teeth 11 </ b> A to release the work holding member 11. .
[0022]
Next, a procedure for tightening a workpiece, for example, a hexagon bolt, by the ratchet wrench 1 according to the present embodiment will be described with reference to FIG. In FIG. 3, the trigger member 14 protrudes from the base member 2, the claw member 13 is not engaged with the ratchet teeth 11 </ b> A, and the work holding member 11 is rotatable. 14, the link mechanism 20, and the like are indicated by virtual lines. Hereinafter, the base end side of the base member 2 is simply referred to as the base end side, and the tip end side of the base member 2 is simply referred to as the tip end side.
First, the operator grasps the vicinity of the trigger member 14 in the housing 4 without pressing it, and inserts a hexagonal portion of a hexagon bolt (not shown) to be tightened into the hexagonal hole 11B in the workpiece holding member 11. As indicated by phantom lines in FIG. 3, the claw member 13 is open and the workpiece holding member 11 is in a free state when the trigger member 14 is not pressed. The housing 4 is rotated to a position where it can be easily tightened. When the housing 4 is rotated to a position where the hexagon bolt can be easily tightened, the trigger member 14 is gripped together with the housing 4. When the trigger member 14 is gripped, the second arm 23 is pulled against the urging force of the spring 25 and moves to the proximal end side as shown by a solid line in FIG. When the second arm 23 moves to the proximal end side, the other end portion 22C of the first arm 22 is pushed out in the same direction, and the first arm 22 rotates around the support shaft 24, via the pressing portion 22A. The sliding member 21 moves to the proximal end side.
[0023]
When the sliding member 21 moves to the proximal end side, the locking portions 13D and 13E of the claw member 13 that have been pushed out by the notches 21A and 21B of the sliding member 21 become free. Here, the left piece 13A and the right piece 13B of the claw member 13 are closed by the urging force of the spring 13C disposed between the left piece 13A and the right piece 13B of the claw member 13. When the left piece 13A and the right piece 13B of the claw member 13 are closed, the plurality of ratchet claws 12, 12... Respectively formed on the left piece 13A and the right piece 13B mesh with the ratchet teeth 11A, and the work holding member 11 rotates. Is suppressed.
[0024]
In this manner, the worker performs fastening work and loosening work of the hexagon bolt with the work holding member 11 being prevented from rotating. As it is, the hexagon bolt is turned to some extent, and when the operator reaches an arbitrary position where it is easy to continue the work, the trigger member 14 is released. When the trigger member 14 is released, the urging force of the spring 25 acts in the direction indicated by the arrow in FIG. 3, and the second arm 23 is pulled toward the distal end side as indicated by the phantom line in FIG. It protrudes outside the housing 4. On the other hand, when the second arm 23 is pulled toward the distal end side, the first arm 22 rotates and the sliding member 21 is pushed out toward the distal end portion. When the sliding member 21 is pushed out, the locking portions 13D and 13E of the claw member 13 are pushed by the notches 21A and 21B formed at the front end portions of the sliding member 21, and the claw member 13 is opened. When the claw member 13 is opened, the ratchet claws 12, 12... Formed on the left piece 13A and the right piece 13B of the claw member 13 are separated from the ratchet teeth 11A of the work holding member 11, and the work holding member 11 is free. Return to state. Thereafter, the worker rotates the housing 4 to a position where the hexagon bolt can be easily tightened in this state. Then, the trigger member 14 is also gripped together with the housing 4 to prevent the work holding member 11 from rotating.
[0025]
Thereafter, the hexagon bolt can be tightened by repeating the same operation. In this way, the hexagon bolt can be fastened and relaxed quickly and reliably. Therefore, even in a narrow place, the bolts and nuts can be easily tightened and relaxed.
[0026]
Further, since the ratchet claws 12, 12... Formed on the claw member 13 and the ratchet teeth 11A formed on the work holding member 11 are engaged, the fastening force or the relaxation force is dispersed. Therefore, it is not necessary to increase the size of the claw member 13 or the work holding member 11, and thus the ratchet wrench 1 itself can be reduced in size.
[0027]
The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, although the left piece 13A and the right piece 13B are formed as a pair as the claw member 13, a claw member made of one piece can also be used. Moreover, although the ratchet nail | claw is formed in multiple numbers as a suitable aspect, one may be sufficient. Furthermore, by replacing the hexagonal hole 11B formed on the inner side of the workpiece holding member 11 with a hole having an appropriate shape, it is possible to perform work of fastening and relaxing workpieces made of bolts having various shapes.
[0028]
【The invention's effect】
As described above, according to the invention according to claim 1 of the present invention, it is only necessary to operate the trigger member, so that the work can be fastened without requiring a large swinging width.
[0029]
Moreover, according to this invention, rotation of a workpiece | work holding member can be suppressed more reliably. For this reason, even if the ratchet pawl and the ratchet teeth are downsized, the ratchet pawl and the ratchet teeth can be reliably engaged. Therefore, it is possible to reduce the size of the entire ratchet wrench and to exert a sufficient tightening force without greatly swinging the handle.
[0030]
Further , according to the present invention, the ratchet teeth mesh with the plurality of ratchet claws, and the meshing force is dispersed, so that the workpiece holding member can be more reliably prevented from rotating. For this reason, even if the ratchet pawl and the ratchet teeth are downsized, the ratchet pawl and the ratchet teeth can be reliably engaged. Therefore, it is possible to reduce the size of the entire ratchet wrench and to exert a sufficient tightening force without greatly swinging the handle.
[0031]
Further , according to the present invention, since the base member is bent and further has a link mechanism adapted to the bending, the overall size of the ratchet wrench can be further reduced.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a ratchet wrench according to the present invention.
FIG. 2 is a plan view of a ratchet wrench according to the present invention.
FIG. 3 is an enlarged plan sectional view of a main part of a ratchet wrench according to the present invention.
FIG. 4 is a plan view of a conventional ratchet wrench.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ratchet wrench 2 Base member 3 Lid member 4 Housing 11 Work holding member 11A Ratchet tooth 12 Ratchet claw 13 Claw member 13C Spring (claw member biasing means)
14 Trigger member 20 Link mechanism 21 Sliding member 22 First arm 23 Second arm 25 Spring (biasing means)

Claims (1)

A rotatable work holding member having ratchet teeth formed around it, and a ratchet claw meshing with the ratchet teeth,
A trigger member attached to be able to advance and retreat with respect to the base member ;
When the trigger member protruding from the base member enters the base member, the ratchet pawl is engaged with the ratchet teeth to prevent the workpiece holding member from rotating, while the trigger member is A link mechanism for releasing the workpiece holding member by moving the ratchet pawl away from the ratchet teeth by retreating from the member ;
Urging means for urging the trigger member in a direction to retract the base member ,
A plurality of the ratchet claws are formed in a pair of claw members that are opened and closed by the link mechanism, and claw member urging means that urges the claw members in a closing direction is provided between the pair of claw members. Intervened,
The base member has a bowl shape in which a tip portion is bent between the work holding member and the trigger member,
The link mechanism includes a sliding member that meshes the ratchet pawl with the ratchet teeth, a first arm that is pivotally supported by a support shaft provided on the base member, and slides the sliding member; A second arm pivotally attached to the arm and connected to the trigger member, the second arm rotating the first arm around the support shaft as the trigger member advances and retreats with respect to the base member;
The sliding member is slidably disposed at the center of the base member along the inner edge of the spacer member fixed to both sides of the base member, and the claw member is disposed outside the sliding member. The ratchet wrench is configured such that a notch formed on both sides of the tip of the sliding member engages with a locking portion formed on the inside of the claw member. .

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