JP3961712B2 - Open end wrench - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an open end wrench for rotating a nut externally attached to a shaft-like workpiece such as a tie rod incorporated in a steering mechanism of an automobile.
[0002]
[Prior art]
As shown in FIG. 6, a tie rod C that transmits the movement of the relay rod A interlocking with the steering wheel to the knuckle arm B is incorporated in the steering mechanism of the automobile. The tie rod C includes a rod body C1 connected to the relay rod A via a ball joint A1, and a rod end C2 connected to a knuckle arm B via a ball joint B1. The end of the rod body C1 is screwed into the rod end C2, and the length of the tie rod C is increased by rotating the rod body C1 by engaging a wrench with a tool engagement part C3 having a hexagonal cross section formed on the rod body C1. The wheel toe can be adjusted. After the toe adjustment, the nut C4 extrapolated to the rod body C1 is tightened to the rod end C2 side to prevent the rod body C1 from rotating.
[0003]
Conventionally, as an open-end wrench for tightening the nut C4, a rotating body in which an insertion groove into which a shaft-like workpiece can be inserted in a radial direction is formed at the tip of a wrench body according to Japanese Patent Laid-Open No. 1-295766. In addition, it is known that the rotating body is provided with a socket portion into which a nut can be inserted in the axial direction. According to this, if the tie rod is inserted into the insertion groove of the rotating body and the socket portion is engaged with the nut from the axial direction, the nut is tightened without moving the wrench body simply by rotating the rotating body thereafter. Can be done easily.
[0004]
[Problems to be solved by the invention]
In the conventional open-end wrench described above, when the nut is tightened, each corner of the outer surface of the nut may bite into each side of the rectangular inner surface of the socket, and the socket cannot be detached from the nut in the axial direction.
[0005]
In view of the above, an object of the present invention is to provide an open-end wrench that can smoothly remove the socket portion from the nut in the axial direction after the nut is tightened.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is an open end wrench for rotating a nut externally attached to a shaft-shaped workpiece, and is an insert capable of inserting the shaft-shaped workpiece in the radial direction at the tip of the wrench body. A rotating body having a groove is pivotally supported, and the rotating body is provided with a socket part into which the nut can be inserted in the axial direction. A roller that can be engaged with the nut is provided on each side of the rectangular inner surface of the socket part. The shaft is supported in parallel with each side.
According to the present invention, when the nut is inserted into the socket portion and the rotating body is rotated, the roller is engaged with the nut and the nut is tightened. Then, after tightening the nut, the socket part is detached from the nut in the axial direction. At this time, the roller rolls in the axial direction with respect to the nut. Therefore, even if the corner portion of the nut bites into the roller when the nut is tightened, the socket portion can be smoothly detached from the nut in the axial direction.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2, reference numeral 1 denotes a wrench body of an open end wrench for tightening a nut C4 of a tie rod C shown in FIG. The wrench main body 1 is formed by fastening two half-shaped portions 11 and 12 of a half-shaped case with a plurality of bolts 13 and is hollow. The rotating body 2 is sandwiched between the tip portions of both halves 11 and 12. Then, concentric circular holes 11a and 12a are formed at the front ends of the half portions 11 and 12, and the shaft portions 2a and 2a protruding from both side surfaces of the rotating body 2 are fitted into the circular holes 11a and 12a. Thus, the rotating body 2 is rotatably supported around an axis O connecting the centers of the circular holes 11a and 12a.
[0008]
Further, notches 11b and 12b for insertion guides of the rod body C1 of the tie rod C which is a shaft-like work are formed at the tips of both halves 11 and 12 of the wrench body 1 so as to reach the circular holes 11a and 12a. The rotating body 2 is formed with an insertion groove 2b for the rod main body C1 that opens to the peripheral surface. Thus, if the rotating body 2 is in a phase in which the insertion groove 2b matches the notches 11b and 12b, the rod body C1 can be inserted in the insertion groove 2b in the radial direction through the notches 11b and 12b.
[0009]
Further, the wrench body 1 is provided with driving means 3 for rotating the rotating body 2. As shown in FIG. 2, the driving means 3 includes a toothed pulley 30 provided in the tail end portion of the wrench body 1 and a pulley 30 provided near the tip of the wrench body 1 via a toothed belt 31. The pulley 32 includes a toothed pulley 32 to be connected, a gear 33 fixed to the pulley 32, and a pair of gears 34 and 34 meshing with the gear 33. The gear 2c formed on the outer peripheral surface of the rotating body 2 is a gear. The rotating body 2 is rotated through the belt 31, the pulley 32, the gear 33, and the gears 34 and 34 by meshing with the pulleys 34 and 34 and rotating the pulley 30 with the handle 35 connected thereto. . The pulley 30 is pivotally supported by a movable frame 37 provided in the longitudinal direction of the wrench main body 1 so as to be adjustable in position by screws 36 so that the tension of the belt 31 can be adjusted by adjusting the position of the movable frame 37. Yes.
[0010]
Further, on one side surface of the rotating body 2 in the axial direction, a socket portion 4 is provided in which a nut C4 externally attached to the tie rod C can be inserted in the axial direction. As shown in FIG. 3, the socket portion 4 has four blocks 40 embedded on one side surface in the axial direction of the rotating body 2 to remove two sides on the hexagonal insertion groove 2b side similar to the outer shape of the nut C4. It has a rectangular inner surface. A roller 41 is pivotally supported on each side of the square inner surface constituted by each block 40 in parallel with each side. As shown in FIG. 4, each block 30 is formed with a shaft support hole 40 a that opens in a slit shape on the inner surface of each block 40 facing inward of the socket portion 4 and is parallel to each side. The roller 41 is inserted into the shaft support hole 40a so that a part of the peripheral surface thereof protrudes from the inner surface of the block 40, and the peripheral surface portion of the roller 41 protruding from the inner surface of the block 40 is engaged with the nut C4. I have to. Each block 40 is fixed to the rotating body 2 with a bolt 42 in a state of being fitted in each concave groove 2d formed in the rotating body 2. When the roller 41 is worn, the block 40 is removed and the roller 41 is removed. It can be exchanged.
[0011]
When tightening the nut C4 after adjusting the wheel toe, the tool engaging portion of the tie rod C is inserted into the insertion groove 2b with the insertion groove 2b of the rotating body 2 aligned with the notches 11b and 12b at the tip of the wrench body 1. C3 is inserted in the radial direction through the notches 11b and 12b, and then the wrench body 1 is moved to the nut C4 side, and the rotating body 2 is rotated by operating the handle 35, and the phase of the socket portion 4 of the rotating body 2 is adjusted. The socket portion 4 is fitted to the nut C4 from the axial direction so as to match the phase of the nut C4. Next, the rotating body 2 is rotated counterclockwise in FIG. 3, which is the tightening direction of the nut C4. According to this, each roller 41 of the socket part 4 engages with the nut C4 as indicated by an imaginary line in FIG. 3, and the rotational force is transmitted to the nut C4 via the roller 41, and the nut C4 is tightened.
[0012]
When the tightening of the nut C4 is completed, the wrench body 1 is moved to disengage the socket part 4 from the nut C4 in the axial direction. At this time, the roller 41 rolls in the axial direction with respect to the nut C4. Even if the corner portion of the nut C4 bites into the roller 41 sometimes, the socket portion 4 is smoothly detached from the nut C4.
[0013]
Next, the rotating body 2 is rotated, and when the insertion groove 2b of the rotating body 2 matches the notches 11b and 12b at the tip of the wrench body 1, the rotation of the rotating body 2 is stopped and the wrench body 1 is detached from the tie rod C. Let
[0014]
In the above-described embodiment, each roller 40 constituting each side of the socket portion 4 is supported by one roller 41. However, as shown in FIG. The roller 41 may be pivotally supported.
[0015]
As mentioned above, although embodiment which applied this invention to the hand-held type open end wrench was described, this invention is applicable similarly to the open end wrench mounted in an automatic machine.
[0016]
【The invention's effect】
As is apparent from the above description, according to the present invention, even when the nut bites into the socket portion when the nut is tightened, the socket portion can be smoothly detached from the nut in the axial direction, and the usability is improved. .
[Brief description of the drawings]
1 is a side view of an example of the wrench of the present invention. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. FIG. 3 is a cut-away side view of a rotating body cut along line III-III in FIG. 3 is a cross-sectional view taken along the line IV-IV in FIG. 3. FIG. 5 is a cross-sectional view taken along the line corresponding to FIG. 4 in another embodiment.
C tie rod (workpiece) C4 Nut 1 Wrench body 2 Rotating body 2b Insertion groove 4 Socket part 41 Roller

Claims (1)

An open-end wrench for rotating a nut extrapolated to a shaft-shaped workpiece,
In the tip of the wrench body, a rotating body in which an insertion groove capable of inserting a shaft-shaped workpiece in the radial direction is pivotally supported, and a socket portion in which a nut can be inserted in the axial direction is provided on the rotating body.
On each side of the rectangular inner surface of the socket part, a roller that can be engaged with the nut is pivotally supported in parallel with each side.
An open-end wrench characterized by

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