JPH0742612Y2 - Box spanner - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box spanner, and more particularly to a box spanner that rotates in one direction but does not rotate in the other direction.

[0002]

2. Description of the Related Art In the manufacturing industry and the processing industry, there are many opportunities to use a box spanner. If you use a box wrench, you can quickly install and remove bolts and nuts,
Moreover, there is an advantage that it can be used in accordance with any bolt shape. The most common type of conventional box spanner is the ratchet type. In such a ratchet type, the claw blocks strongly pressed by the two springs are tightly engaged with the ratchet ring, and both claw blocks are appropriately operated by the conversion lever to change the rotation direction of the ratchet ring.

[0003]

However, since the ratchet ring and the claw block are considerably difficult to manufacture, not only the manufacturing cost becomes high, but there are the following drawbacks in actual use.

1. Since the torque received by the spanner acts only on one point where the claw block and the ratchet ring come into contact with each other, if the torque received is too large, the claw block or the ratchet ring may be damaged, or the mesh may be disengaged. The phenomenon occurs.

2. There is a certain gap between the teeth of the ratchet ring, and when the spanner rotates a certain angle in one direction, it always rotates a specific angle in the opposite direction to rotate the claw block. It is necessary to mesh with the next tooth. Therefore, if the space of the work place is too narrow, the spanner cannot be rotated to the smallest necessary angle. Therefore, the function of the spanner cannot be fully exerted, and even if the spanner can be managed by some means, its working efficiency is far from ideal.

3. Since the parts such as the ratchet ring, the claw block, and the switching lever are stored, the box spanner requires a relatively large storage space, and the spanner becomes heavy.

4. When the wrench spins in the opposite direction, the claw block and ratchet ring constantly collide with each other due to the tight pressing of the spring, causing friction and scattering of sparks.
Use in oily or easily explosive environment is dangerous.

For the purpose of solving the drawbacks of the ratchet type spanner, the inventor of the present invention considered a "clutch type" box spanner as shown in FIG. This box spanner includes a grip handle (a), and a cylindrical head portion (c) having a fitting insertion hole formed in one end of the grip handle in a direction orthogonal to the axial direction is integrally formed. Roll pins (d) are arranged in parallel and circularly along the cylindrical inner peripheral surface of the insertion hole of the head portion (c). Further, the cam sleeve (e) is inserted into the insertion hole of the head portion (c) through the roll pin (d).
Is fitted. On the outer peripheral surface of the cam sleeve (e), concave cam surfaces are formed by the number corresponding to the roll pins (d). The cam sleeve (e) holds a drive plug (f) for rotating the head box. With such a "clutch-type" box spanner, some of the problems of conventional ratchet spanners have been solved,
Since the structure is still complicated, and it tends to be time-consuming to manufacture and assemble, the structure is simpler and the number of parts can be further reduced.

Therefore, in view of the problems of the conventional box spanner, the main object of the present invention is a long service life,
It can be used in a small space, and its weight is relatively light.
It is to provide a box spanner with improved work efficiency and safety.

[0010]

[Means for Solving the Problems] This invention is a grip handle,
A head portion formed at one end of the handle and having a fitting insertion hole,
The two ring bodies are fitted and inserted into the fitting holes of the head portion, and the outer diameter of the ring bodies is approximately equal to the inner diameter of the fitting holes, and the two ring bodies are eccentrically arranged between the two ring bodies. A drive ring composed of an eccentric shaft, a polygonal mounting hole formed in a central shaft portion of the drive ring from one ring body of the drive ring toward the other ring body, and two rings on the outer peripheral side of the eccentric shaft. A crescent-shaped engagement member that is fitted to a pin shaft that is passed between the bodies and that is arranged so that its outer peripheral surface and the outer peripheral surface of the ring body are substantially aligned when one end of the pin shaft is fitted to the eccentric shaft. A box spanner including a retaining ring piece and a drive body that is mounted in a mounting hole of a drive ring and has a portion having the same shape as the mounting hole.

It is more preferable that the outer peripheral wall surface of the locking ring piece and the outer peripheral wall surface of the ring body of the drive ring are provided with tooth-shaped groove patterns to increase the pressure contact frictional force with the fitting insertion hole of the spanner head portion. .

[0012]

When the grip handle is rotated to bring the locking ring piece outer peripheral wall into pressure contact with the fitting insertion hole inner peripheral wall, the locking ring piece rotates together with the eccentric shaft and the locking ring piece outer peripheral wall. Crim on the inner wall of the insertion hole more and more strongly. Then, the driving body of the spanner is driven to tighten or loosen the bolts and nuts. On the contrary, when the grip handle is rotated in the opposite direction, one end of the locking ring piece abuts the pin shaft and the outer peripheral surfaces of both ring bodies and the locking ring piece are arranged so as to substantially coincide with each other. Spin idle.

Further, when tooth-shaped groove patterns are provided on the outer peripheral wall of the locking ring piece and the outer peripheral wall of the ring body of the drive ring, the outer peripheral wall of the lock ring piece and the drive ring and the inner peripheral wall of the fitting hole of the spanner head portion are formed. The pressure contact friction force of increases.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0015]

1 is an exploded perspective view showing an embodiment of the present invention. The box spanner 10 includes a handle 13. Handgrip 1
A head portion 11 having a fitting insertion hole 12 formed therein is formed at one end of 3. In the vicinity of both ends of the insertion hole 12 of the head portion 11,
Each has a ring-shaped slot 121.

A drive ring 20 is fitted into the fitting hole 12 of the head portion 11. The drive ring 20 is formed to have a thickness approximately equal to the distance between the ring-shaped slots 121. The drive ring 20 is slidably fitted in the fitting insertion hole 2
Including one ring body 21. A cylindrical eccentric shaft 22 is formed between these ring bodies 21. The center axis of the eccentric shaft 22 is provided with an appropriate amount of eccentricity so as to deviate from the center axes of the two ring bodies 21. Then, on the outer peripheral side of the eccentric shaft 22, the pin shaft 50 is fixedly provided so as to be inserted between the two ring bodies 21. Further, the drive ring 20
A square mounting hole 23 is formed in the central portion, and the driving body 60 is mounted therein. The driving body 60 is formed in a columnar shape, and the central portion thereof is formed in a quadrangular prism shape that substantially coincides with the mounting hole 23. Further, both ends of the driving body 60 are formed in a shape in which the corners of the central portion are chamfered. Therefore,
The driving body 60 includes a shoulder portion 61 between the central portion and both end portions thereof.
Is formed.

A locking ring piece 30 is fitted on the outer peripheral surface side of the eccentric shaft 22 of the drive ring 20. This locking ring piece 30
Is formed in a crescent shape with both ends curved so as to face each other. A fitting hole 31 that matches the eccentric shaft 22 is formed in the locking ring piece 30, and an opening 32 is formed in the fitting hole 31 so that the locking ring piece 30 is elastically urged to expand outward. You can do it. Also, from the opening 32 to the locking ring piece 3
0 is fitted to the eccentric shaft 22 of the drive ring 20, and one end of the locking ring piece 30 is arranged so as to be able to contact the pin shaft 50. When the locking ring piece 30 rotates and comes into contact with the pin shaft 50, when viewed from the end surface, the outer peripheral wall surface 33 of the locking ring piece 30 is exactly the both ring bodies 21 of the drive ring 20.
To be superimposed on.

Two ring-shaped slots 1 of the head part 11
A fixing piece 40 is attached to 21. This fixing piece 4
0 is formed in a ring shape having a through hole 41, and its original shape is bent to form a part of a spherical surface. The diameter of the primitive shape is slightly smaller than that of the insertion hole 12,
The ring-shaped slots 121 are respectively fitted. Further, the fixing piece 40 is pressed flat by a method of pressing, whereby the outer edge is enlarged. Then, the enlarged outer edge of the fixing piece 40 is filled in and fixed to the ring-shaped slot 121, and the fixing piece 40 is fixed to the head portion 11. By this fixing piece 40, the drive ring 20 and the locking ring piece 30 are housed in the fitting insertion hole 12, and furthermore, both ends of the driving body 60 respectively project from the through holes 41 of the fixing piece 40.

In this box spanner 10, as shown in FIG. 2, when the grip handle 13 of the spanner is rotated in the reverse hour hand direction (the arrow direction in FIG. 2), one end of the locking ring piece 30 contacts the pin shaft 50. Contact. In this state, as shown in FIG. 4, the outer peripheral surface of the locking ring piece 30 and the outer peripheral surface of the ring body 21 are arranged so as to substantially coincide with each other. Therefore, the drive ring 20 and the locking ring piece 30 rotate idly inside the fitting insertion hole 12 of the head portion 11.

On the contrary, as shown in FIG. 3, when the handle 13 is rotated in the direction of the hour hand (the direction of the arrow in FIG. 3), the locking ring piece 30 is moved.
Is rotationally moved along the eccentric shaft 22 and separated from the pin shaft 50, and its outer peripheral surface is arranged outside the outer peripheral surface of the ring body 21. Therefore, as shown in FIG. 4, the outer peripheral surface of the locking ring piece 30 is pressed against the inner peripheral surface of the fitting insertion hole 12. Furthermore, the eccentric shaft 2 of the drive ring 20 on the opening 32 side is provided by the elasticity of the locking ring piece 30 itself which expands outward.
2 is pressed, and accordingly, the ring body 21 is fitted into the insertion hole 12
It is pressed against the inner surface. Then, as the turning torque of the grip handle 13 increases, the locking ring piece 30 is inserted into the fitting insertion hole 12.
And the force of crimping to the eccentric shaft 22 is increased,
Accordingly, the drive ring 20 can be rotated in the hour hand direction. Therefore, the socket mounted on the drive body 60 attached to the drive ring 20 rotates and can be rotated to tighten or remove the bolt or nut.

Then, in the actual use operation, the operator sometimes encounters different types of bolts such that the bolts are screwed in from the bottom to the top or from the top to the bottom. Also, due to the difference in the screwing direction, if you encounter a bolt that loosens or tightens in two different directions (or a bolt that is a left-handed screw due to special circumstances),
By pushing the driving body 60 toward one end side or the other end side of the head portion 11 of the spanner, two different driving directions can be obtained. That is, when the driving body 60 is pushed in any one direction, the shoulder 61 at the middle step thereof is engaged with the through hole 41 of the fixing piece 40. This is because the diameter of the through hole 41 is substantially equal to the length of the diagonal line in the central portion of the driving body 60, and the corner portions at both end portions thereof are all chamfered, so that they can pass through the through hole. Further, when the bolt spanning work is performed using the box spanner 10 of the present invention, if the spanner has to be driven in the opposite direction, if it encounters, the spanner can be opened by using the above operation.
If the driving body 60 is pushed out to the other end after being rotated 0 degree, the bolt can be screwed by driving in the opposite direction, which is extremely convenient.

FIG. 6 shows another embodiment of the present invention, in which the ring body 21 'of the drive ring 20' and the locking ring piece 3 are provided.
A tooth-shaped groove pattern is provided on the outer peripheral wall surface of 0'to increase the pressure contact frictional force with the fitting insertion hole 12 of the spanner head portion 11. With the box spanner 10 shown in FIG. 6, even greater force can be applied when tightening bolts and nuts.

[0023]

EFFECTS OF THE INVENTION According to the present invention, since the grip handle is rotated to bring the locking ring piece outer peripheral wall into pressure contact with the inner wall of the fitting insertion hole, the locking ring piece is released. It rotates with an eccentric shaft, and the outer peripheral wall of the locking ring piece is more and more strongly pressed against the inner peripheral wall of the insertion hole, driving the spanner drive body to tighten or loosen the bolts and nuts. be able to. Conversely, when the grip handle is rotated in the opposite direction, the outer peripheral surface of the locking ring piece and the outer peripheral surface of the ring body are arranged so as to substantially coincide with each other, so that the spanner idles.

Since this box spanner has a simpler structure than that using a conventional ratchet ring or claw block, it can be manufactured easily and at low cost. In addition, this box spanner has a lighter weight and a longer service life than conventional box spanners. Further, it is not necessary to rotate the drive body by a certain angle to rotate the drive body idly, and the drive body can be used in a relatively small work place. Moreover, unlike the ratchet type, there is an advantage that sparks are not scattered and safety is improved.

Further, by providing a tooth-shaped groove pattern on the outer peripheral wall of the locking ring piece and the outer peripheral wall of the ring body of the drive ring,
If the pressure contact frictional force between the outer peripheral wall of the locking ring piece or the drive ring and the inner peripheral wall of the fitting hole of the spanner head is increased,
The above advantages are better.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is an illustrative view of the box spanner shown in FIG. 1 during idling operation.

FIG. 3 is an illustrative view at the time of driving operation of the box spanner shown in FIG.

FIG. 4 is an illustrative view of the box spanner shown in FIG. 2 during idling operation.

5 is an illustrative view at the time of driving operation of the box spanner shown in FIG. 3. FIG.

FIG. 6 is an exploded perspective view of another embodiment of the present invention.

FIG. 7 is a cross-sectional view of a conventional box spanner.

[Explanation of symbols]

 10 Box Spanner 11 Head Part 12 Fitting Hole 121 Ring-shaped Slot 13 Grip Handle 20 Drive Ring 21 Ring Body 22 Eccentric Shaft 23 Mounting Hole 30 Locking Ring Piece 31 Fitting Hole 32 Opening 33 Outer Wall Surface of Locking Ring Piece 40 Fixing Piece 41 Through hole of fixing piece 50 Pin shaft 60 Driver 61 Shoulder of driver 20 'Drive ring 21' Ring body

Claims (4)

[Scope of utility model registration request] 1. A grip handle, which is formed at one end of the grip handle and has a fitting insertion hole, is fitted into the fitting insertion hole of the head portion, and an outer diameter thereof is substantially equal to an inner diameter of the fitting insertion hole. A drive ring composed of two ring bodies and an eccentric shaft formed between the two ring bodies so as to be eccentric with the two ring bodies, and from one ring body of the drive ring to the other ring body. A polygonal mounting hole formed in the central shaft portion of the drive ring, a pin shaft that is inserted between the two ring bodies on the outer peripheral side of the eccentric shaft, and is fitted to the eccentric shaft, one end of which is the pin. A crescent-shaped locking ring piece arranged so that its outer peripheral surface and the outer peripheral surface of the ring body are substantially aligned when hitting a shaft, and the mounting hole of the drive ring is mounted to the mounting hole. Drive with parts of the same shape Including the body, box spanner. 2. The head portion includes two ring-shaped slots formed at both end portions of the inner peripheral surface of the fitting insertion hole, and a fixing piece having a through hole in the center and fitted into the slot. The box spanner according to claim 1. 3. The mounting hole of the ring body is formed in a square shape, a central portion of the driving body is formed in a square shape that engages with the mounting hole, and both end portions of the driving body are driven by the driving body. The box spanner according to claim 1 or 2, wherein the box spanner is formed in a shape in which a corner portion of the body is chamfered. 4. The box spanner according to claim 1, wherein a tooth-shaped groove pattern is provided on an outer peripheral wall surface of the locking ring piece and an outer peripheral wall surface of the ring body of the drive ring.