JP5539701B2 - wrench - Google Patents

Description

  The present invention relates to an improvement of a wrench that can easily adjust the position of a movable jaw relative to a fixed jaw.

  Conventionally, a tool called a wrench has been widely used as a tool for tightening fasteners such as pipe joints and bolts and nuts.

  Here, the structure of the wrench will be briefly described. The wrench is composed of an elongated plate-shaped wrench body, a fixed jaw projecting laterally from the tip of the wrench body, and the wrench body in its longitudinal direction. It is attached so as to be movable, and includes a joint portion of a pipe that is a fastening object or a movable jaw that clamps a bolt head or nut in cooperation with a fixed jaw. Rack teeth are formed on the long side of the wrench body on the side where the fixed jaw protrudes, and a worm screw rotatably attached to the movable jaw meshes with the rack teeth.

  In the conventional wrench, the position of the movable jaw with respect to the fixed jaw (that is, the distance between the fixed jaw and the movable jaw) can be adjusted by rotating the worm screw meshed with the rack teeth.

  However, when it is necessary to move the movable jaw greatly, such as when the diameter of the object to be fastened is large, such as piping, it is necessary to rotate the small worm screw over and over again, which is very troublesome. There was a problem.

  Therefore, as a technique for solving such a problem, for example, Japanese Utility Model Laid-Open No. 54-26798 discloses that the meshing state of the worm screw and the rack teeth is released as necessary to move the movable jaw to the wrench body. Has been disclosed.

  The structure of the wrench according to Patent Document 1 will be briefly described. In the wrench according to Patent Document 1, the movable jaw is attached to the wrench main body so as to be tiltable. When the movable jaw is tilted, the meshed state between the worm screw and the rack teeth is released, so that the movable jaw moves freely with respect to the wrench body, and the movable jaw can be easily moved with respect to the fixed jaw.

  When the position adjustment of the movable jaw with respect to the fixed jaw is completed, the movable jaw is returned to its original state, and the worm screw is reengaged with the rack teeth. Then, the position of the movable jaw is finely adjusted by turning the worm screw, and the work for fastening the object to be fastened is started.

  In the conventional wrench according to Patent Document 1, the meshing state of the rack teeth and the worm screw is released by inclining the movable jaw with respect to the wrench main body, but the wrench itself has the movable jaw parallel to the fixed jaw. It is common sense to move close to and away from each other while maintaining the position, and the fact that the movable jaw tilts gives a sense of incongruity in terms of robustness and accuracy from the perspective of a conventional wrench, and the worm against the rack teeth Since the screw must be engaged and disengaged in a circular orbit, it is necessary to provide a large amount of play between the two, and if the position of the movable jaw is adjusted while the movable jaw is tilted, the amount of the movable jaw is tilted. Since an error occurs between the fixed jaw and the movable jaw, it is necessary to further adjust the position of the movable jaw by rotating the worm screw greatly in order to correct the error. There is such a.

  Therefore, in order to solve these problems, a wrench as disclosed in Patent Document 2 has been proposed.

  In the wrench according to Patent Document 2, the worm screw is attached so as to be movable in a direction orthogonal to the sliding direction of the movable jaw, and the rack tooth and the worm are separated from the rack tooth by picking the worm screw itself with a finger. The meshing state with the screw is released.

Japanese Utility Model Publication No. 54-26798 (Fig. 2) Design Registration No. 1196546

  However, in the wrench according to Non-Patent Document 1, in order to release the meshing state between the rack teeth and the worm screw, the wrench body is grasped with one hand, the worm screw is grasped with the finger of the other hand, and the rack teeth In addition, it is necessary to move the movable jaw while keeping the separated state, and there is a problem that it is impossible to work with one hand. In particular, the release mechanism cannot be used practically in a narrow space in which many pipes pass and cannot be operated with both hands.

  The present invention has been made in view of such conventional problems, and it is an object of the present invention to provide a wrench that can easily and accurately adjust the position of the movable jaw with respect to the fixed jaw with one hand.

The invention described in claim 1 is “a wrench main body 12 having an elongated plate shape and having rack teeth 12b formed on an abdominal side 12a which is one long side thereof, and a tip of the abdominal side 12a of the wrench main body 12”. The object to be fastened X is composed of a fixed jaw portion 14 projecting from the portion, and a movable jaw portion 20a which is attached to the wrench main body 12 so as to be movable in the longitudinal direction and which faces the fixed jaw portion 14. The movable jaw main body 20 to be sandwiched, the frame 28 attached to the movable jaw main body 20 so as to be movable in a direction substantially orthogonal to the moving direction of the movable jaw main body 20, and disposed on the ventral side of the wrench main body 12. the worm screw 24 provided on the frame 28 at meshing and away from and rotatable with respect to the rack teeth 12b with the movement of a direction substantially perpendicular to the moving direction of the movable jaw body 20, Contact And a resilient member 26 that is provided between the movable jaw main body 20 and the frame 28 on the back side of the movable jaw main body 20 and biases the frame 28 in the meshing direction of the worm screw 24. The wrench 10 is characterized by comprising the movable jaw 16 that is a pressing member 38 that moves the frame 28 in the compression direction of the elastic member 26 to release the engagement of the worm screw 24.

  In the invention according to claim 1, if the thumb is pressed against the pressing member 38 on the back side of the frame 28 with the hand holding the wrench main body 12 and pressed down against the elastic force of the elastic member 26. The frame 28 moves to the ventral side of the wrench body 12. Then, since the worm screw 24 moves in a direction away from the rack teeth 12b, the meshed state between the worm screw 24 and the rack teeth 12b can be easily released.

  In this state, if a force is applied to the pressing jaw 38 toward the fixed jaw portion 14 (or the opposite side), the movable jaw 16 moves toward the fixed jaw portion 14 (or the opposite side). In addition, since the movable jaw 20a moves in parallel with no inclination with respect to the fixed jaw 14, it is not necessary to adjust the position for eliminating the inclination of the movable jaw as in the prior art.

  When the position adjustment of the movable jaw 16 is completed, the thumb is released from the pressing member 38. Then, the frame 28 moves to the back side by the elastic force of the elastic member 26. At this time, the worm screw 24 also moves to the back side together with the frame 28. That is, the worm screw 24 is connected to the rack teeth 12b. Since it moves in the approaching direction, the meshing state of the worm screw 24 and the rack teeth 12b automatically returns.

  Thus, according to the first aspect of the present invention, a series of releasing the meshing state between the worm screw 24 and the rack teeth 12b, adjusting the position of the movable jaw main body 20, and returning the meshing state between the worm screw 24 and the rack teeth 12b. Since this operation can be performed with one hand and with high precision, even a fastening operation in a narrow space can be performed very easily.

It is a front view which shows the wrench which concerns on this invention. It is sectional drawing in FIG. It is a disassembled perspective view which shows a movable jaw. It is a front view which shows the state which pushed down the pressing member. It is sectional drawing in FIG.

  Hereinafter, a wrench 10 according to the present invention will be described with reference to the drawings. The wrench 10 according to the present invention is roughly constituted by a wrench main body 12 serving as a handle, a fixed jaw portion 14 that is one of the operating portions, and a movable jaw 16 that is the other of the operating portions (see FIGS. 1 and 2).

  The wrench body 12 is an elongated rectangular plate-shaped member made of a rigid material such as metal, and rack teeth 12b are provided at the central portion of the long side of the abdominal side 12a, which is the long side of the wrench main body 12 (the lower side in FIG. 1). Is engraved.

  A fixed jaw portion 14 projects from the distal end portion of the ventral side 12 a of the wrench body 12.

  The fixed jaw portion 14 has a contact surface 14a extending in a direction orthogonal to the longitudinal direction of the wrench body 12, and the interval between the contact surface 14a and the outer surface 14b on the back side of the corresponding surface 14a is determined by the wrench. The entire fixed jaw portion 14 is formed in a substantially triangular shape in a tapered front view so that the connecting portion side with the main body 12 is wide and narrows toward the tip.

  The movable jaw 16 is attached to the wrench main body 12 so that the position of the movable jaw 16 can be adjusted in the longitudinal direction. The movable jaw 16 cooperates with the fixed jaw portion 14 to connect a pipe joint portion to be fastened X or a fastener such as a bolt or a nut. As shown in FIG. 3, the movable jaw main body 20, the worm screw 24, the resilient member 26, and the frame 28 are generally configured.

  The movable jaw main body 20 is a thick plate-like member made of a rigid material such as metal, and the thickness thereof is set to be thicker than the thickness of the wrench main body 12.

  A portion of the movable jaw main body 20 that faces the fixed jaw portion 14 is provided with a movable jaw portion 20a that has a substantially triangular shape in front view at a position facing the fixed jaw portion 14. The contact surface 20b of the movable jaw portion 20a is set to be substantially parallel to the contact surface 14a of the fixed jaw portion 14.

  The movable jaw body 20 is provided with a wrench body insertion hole 20c penetrating from the surface facing the fixed jaw portion 14 to the opposite side surface, and the wrench body 12 described above is inserted into the wrench body insertion hole 20c. Is inserted.

  On the back side of the movable jaw main body 20 (upper side in FIG. 1), a pressing member accommodating recess 20d is formed. The central portion of the pressing member receiving recess 20d is raised one step, and a round hole 20e is formed in the upper surface of the raised portion, and a helical spring as a resilient member 26 is formed in the round hole 20e. The lower end of is fitted.

  A worm screw accommodating recess 20f for accommodating a worm screw 24 to be described later is formed on the abdomen side of the movable jaw main body 20 at a position facing the pressing member accommodating recess 20d. Shaft receiving grooves 20 g are formed on the inner side surfaces of both sides of the worm screw receiving recess 20 f, and the lower ends of the shaft receiving grooves 20 g are opened at the bottom surface of the movable jaw main body 20.

  A pair of left and right ribs 20 h are provided on both front and rear surfaces of the movable jaw main body 20 so as to extend in the vertical direction (a direction substantially orthogonal to the longitudinal direction of the wrench main body 12). The interval between the ribs 20h is set to be approximately equal to or slightly wider than the width in the left-right direction of the frame 28 so that the frame 28 described later can be fitted between the ribs 20h. The protruding amount of the rib 20h is set to be slightly larger than the thickness of the frame 28 described later.

  When the worm screw 24 is detached from the rack teeth 12b, the worm screw 24 adjusts the position in the forward / backward direction of the movable jaw body 20 that is slidably attached to the wrench body 12 in the longitudinal direction (left-right direction in FIG. 1). It has a cylindrical worm screw main body 24a and a spiral ridge 24b. The spiral protrusions 24b are spirally provided on the outer surface of the worm screw main body 24a, and the pitch (interval) thereof is appropriately set to match the pitch of the rack teeth 12b so as to mesh with the rack teeth 12b. Yes. A shaft 30 is inserted into a hole 24c formed in the center of the worm screw main body 24a as will be described later.

  The frame 28 is for holding the worm screw 24 slidably with respect to the movable jaw main body 20 in a vertical direction (a direction substantially perpendicular to the longitudinal direction of the wrench main body 12). 34 and a pressing member 38 provided on the back side.

  The frame main body 36 is formed by bending a thin plate-like member into a substantially U-shape, and a pressing member attaching hole 36a is formed at the upper back portion (upper end portion in FIG. 3) of the front and rear surfaces. It is formed in two places on the left and right.

  On the abdomen side of the frame main body 36, a worm screw receiving recess 36b is formed by cutting out a central portion thereof, and a locking projection piece 36c is formed on the cut-out portion at the front side and the back side of the frame main body 36. It is formed alternately on each side. Each locking protrusion 36c is bent inward, and a locking hole 36d formed at the tip thereof is coaxially positioned.

  The pressing member 38 is a block-like member for sliding the worm screw 24 in the vertical direction (in a direction substantially perpendicular to the longitudinal direction of the wrench main body 12, in other words, in a direction in which the rack teeth 12b are engaged / disengaged). Yes, it is housed in the pressing member housing recess 20d of the movable jaw body 20 described above so as to be slidable in the vertical direction.

  A recess 38a is formed at the center of the bottom surface of the pressing member 38, and the upper end of a helical spring as the resilient member 26 is fitted into the recess 38a. Further, on both sides of the recess 38a of the pressing member 38, communication holes 38b are formed to communicate the front surface and the back surface thereof. The communication hole 38 b is formed at a position corresponding to the pressing member mounting hole 36 a of the frame body 36.

  When assembling the movable jaw 16, first, the worm screw 24 is disposed in the worm screw receiving recess 36b, and the shaft 30 is connected to one locking hole 36d of the frame main body 36, the hole 24c in the center of the worm screw 24, the frame The locking holes 36d on the opposite side of the main body 36 are inserted in this order. As a result, the worm screw 24 is attached to the frame body 36 so as to be rotatable about the shaft 30 as a rotation axis.

  Next, the frame main body 36 to which the worm screw 24 is attached is attached from the lower side of the movable jaw main body 20 so as to sandwich both front and rear sides thereof from the outside (at this time, the frame main body 36 is attached to the ribs 20h, The ends of the shaft 30 projecting from both axial end portions of the worm screw 24 are inserted into the shaft housing groove 20g while being along the 20h), and the pressing member housing recess 20d of the movable jaw main body 20 is inserted. The helical spring as the resilient member 26 and the pressing member 38 are accommodated in this order. Note that the helical spring as the resilient member 26 has a lower end fitted into the round hole 20e of the pressing member housing recess 20d, and an upper end fitted into the recess 38a of the pressing member 38.

  Then, the pressing member 38 is pushed down so that the communication hole 38b and the pressing member mounting hole 36a of the frame body 36 are aligned with each other, and a separately prepared fixing screw 32 is connected to the pressing member mounting hole 36a on the front side of the frame body 36, and the pressing member. 38, and the pressing member attaching hole 36a on the back side of the frame main body 36 are inserted in this order, and the insertion end is fixed by the nut 34 (the frame main body 36 and the pressing member 38 are thereby integrated. A frame 28 will be formed). Accordingly, the worm screw 24 is rotatably provided on the frame 28 (that is, the integrated body of the frame main body 36 and the pressing member 38), and the assembly of the movable jaw 16 is completed.

  Since the helical spring as the elastic member 26 is attached in a bent state, the pressing member 38 is always urged upward by receiving the elastic force of the elastic member 26. Become.

  When the position of the movable jaw 16 is adjusted using the wrench 10 configured as described above, the thumb is pushed against the pressing member 38 located on the back side of the frame 28 while holding the wrench body 12. The pressing member 38 is pushed down by applying force to the abdomen (lower side in FIG. 4). Then, the unitary body of the frame 28 and the worm screw 24 moves downward against the elastic force of the elastic member 26, and the meshed state between the worm screw 24 and the rack teeth 12b is released (FIG. 4 to FIG. 4). (See FIG. 5).

  In a state where the engagement state between the worm screw 24 and the rack teeth 12b is released, the movable jaw main body 20 is free to move with respect to the wrench main body 12. Therefore, by sliding this along the wrench main body 12, The position of the movable jaw 16 can be easily adjusted. The position adjustment of the movable jaw 16 can be easily performed by applying a force toward the fixed jaw 16 to the pressing member 38 (or a force toward the side away from the fixed jaw 16) with the thumb.

  The integral body of the frame 28 and the worm screw 24 is a shaft through which the pressing member 38 constituting the frame 28 moves along the inner surface of the pressing member receiving recess 20d and is inserted through the worm screw 24. 30 moves in the vertical direction along the inner surface of the shaft receiving groove 20g. In other words, the unitary body of the frame 28 and the worm screw 24 moves in a direction perpendicular to the longitudinal direction with respect to the wrench body 12, so that the movable jaw is released when the meshed state of the worm screw 24 and the rack teeth 12b is released. 16 does not tilt with respect to the fixed jaw 14. Therefore, in the position adjustment of the movable jaw 16 accompanied by the release of meshing between the worm screw 24 and the rack teeth 12b, an error associated with the inclination of the movable jaw 16 as in the related art does not occur.

  When the position adjustment of the movable jaw 16 is completed, the thumb holding the pressing member 38 is released. Then, the pressing member 38 is pushed upward by the elastic force of the helical spring as the elastic member 26 that has been bent (in other words, the frame 28, which is an integral part of the pressing member 38 and the frame body 36). Accordingly, the worm screw 24 attached to the frame 28 moves in a direction approaching the rack teeth 12b, and the meshed state with the rack teeth 12b is restored.

  As described above, according to the wrench 10 according to the present embodiment, the meshed state of the worm screw 24 and the rack teeth 12b is released, the position of the movable jaw main body 20 is adjusted, and the meshed state of the worm screw 24 and the rack teeth 12b. Since a series of returning operations can be performed with one hand and with high accuracy, the fastening operation in a narrow space can be performed very easily.

DESCRIPTION OF SYMBOLS 10 ... Wrench 12 ... Wrench main body 14 ... Fixed jaw part 16 ... Movable jaw 18 ... Rack tooth 20 ... Movable jaw main body 24 ... Worm screw 28 ... Frame 38 ... Pushing member

Claims (1)

A wrench body that is in the shape of an elongated plate and has rack teeth formed on the ventral side that is one of its long sides;
A fixed jaw projecting from the tip of the ventral side of the wrench body;
A movable jaw main body that is attached to the wrench main body so as to be movable in the longitudinal direction and sandwiches an object to be fastened with a movable jaw portion that faces the fixed jaw portion, and the movable jaw main body includes the movable jaw A frame attached to be movable in a direction substantially orthogonal to the moving direction of the main body, disposed on the ventral side of the wrench main body, and in a direction substantially orthogonal to the moving direction of the movable jaw main body. provided the rack teeth against the mesh-separable and the worm screw is provided on the frame at rotatable with the movement, at the back side of your and the movable jaw body between the frame and the movable jaw body A resilient member that biases the frame in the meshing direction of the worm screw, and the spine side of the frame moves the frame in the compressing direction of the resilient member to move the warp. Wrench characterized in that it is constituted by a movable jaw which has a pressing member for releasing the engagement of the screw.

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