JPH09314474A - Ratchet wrench having ratchet tooth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rigid structure by improving the engagement strength of a tooth stopper with a ratchet wheel in a ratchet wrench. SOLUTION: A ratchet wrench is provided with a handle part 10, a head part 20 having a cylindrical cavity 23 and a semi-cylindrical cavity in a locally overlapped condition, a ratchet wheel 40 in which a plurality of irregular arc- shaped teeth 42 are provided on its outer circumferential surface and which is provided in the cylindrical cavity 23 in a rotatable manner, and a tooth stopper 50 provided in the semi-cylindrical cavity. The tooth stopper 50 is provided with a plurality of teeth of irregular arc-shape, and selectively operated. The whole teeth of the tooth stopper 50 are firmly engaged with a plurality of teeth 42 of the ratchet wheel 40 to transmit larger torque than the conventional value to the ratchet wheel 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ratchet wrench, and more particularly to a ratchet wrench having ratchet teeth of high strength.

[0002]

2. Description of the Related Art In a conventional ratchet wrench, a ratchet wheel having a plurality of teeth perpendicular to the peripheral surface is rotatably fitted to a head portion, and a pawl is rotatable on the side of the ratchet wheel. It is arranged. The pawl has one or two teeth at its ends. Depending on the selection, either one of the pawls is brought into a state in which one of the teeth is in mesh with the tooth of the ratchet wheel, and the driving direction of the ratchet wrench (the direction in which the ratchet wheel is integrally rotated when the handle portion is rotated) is determined.

[0003]

In the conventional ratchet wrench, only one or two teeth are engaged with the pawl and the ratchet wheel, and the engagement strength is not sufficient. Then, this invention aims at providing the ratchet wrench which has the ratchet tooth which solved the said subject.

[0004]

According to a first aspect of the present invention, there is provided a handle portion, a head portion having a first cavity and a second cavity which are locally overlapped with each other, and an irregular arc shape on an outer peripheral surface thereof. A ratchet wheel having a plurality of teeth and rotatably provided in the first cavity, and a pawl provided in the second cavity, the pawl being in the rotational direction of the ratchet wheel. Which has a concave and convex arc shape and has a plurality of teeth to be selectively operated, the plurality of teeth being in strong mesh with the plurality of teeth of the ratchet wheel Is.

According to a second aspect of the invention, the handle portion and the first
Head part having a cavity and a second cavity locally overlapped with each other and a plurality of teeth on the outer peripheral surface thereof, and provided in the first cavity rotatably in the forward and reverse directions. To control the rotation direction of the ratchet wheel on the ratchet wheel and its surface,
The pawl has a plurality of teeth capable of meshing with the teeth and is rotatably provided in the second cavity, and an actuating means for converting the pawl into first and second position states. When the pawl is set to the first position state in the second cavity by means, by rotating the head portion in the forward direction, the ratchet wheel can rotate in the forward direction and the head portion in the reverse direction. When it is turned, the ratchet wheel becomes idle, and when the pawl is set to the second position state in the second cavity by the operating means, when the head portion is turned in the opposite direction, the ratchet wheel is rotated. Can rotate in the opposite direction, and when the head part is rotated in the forward direction, the ratchet wheel will rotate idly.

According to a third aspect of the present invention, one knob is rotatably provided on the head portion, the actuating means is connected to the knob, and the actuating means moves in association with the rotation of the knob, and the knob is , Has an extended rod and is joined to the pawl, and by rotating the knob, the pawl is set to the state of the first and second positions in the second cavity. .

According to a fourth aspect of the present invention, a circular opening is provided on the plane above the head portion, a circular hole is formed at the center of the circular opening, and the circular opening is formed. A joint hole is formed between the opening and the first cavity so as to penetrate the opening, the knob is rotatably arranged in the circular opening, and the rod of the knob is formed in a central circular hole. It is rotatably inserted and the actuating means comprises a ring attached to the rod.

According to a fifth aspect of the present invention, the knob has a key, and the key is fitted in the joint hole to limit the turning range of the knob. According to a sixth aspect of the present invention, the head portion has a bottom flat surface, a pair of recesses is provided on the outer peripheral surface of the rod of the knob, and the wall of the circular hole extends in a direction approaching the handle portion side. However, the head portion has a hole on one side that is inclined toward the handle portion with respect to the bottom plane, and one steel ball is slightly projected from the hole by the force of the spring in the hole, and the recess of the rod of the knob is formed. It is configured to be fitted with.

According to a seventh aspect of the present invention, the pawl has two stoppers and a gap between the two stoppers on its upper surface, and the extended end of the ring of the actuating means is located in the gap. When the stopper is moved, the pawl is selected to the first and second positions in the second cavity).

[0010]

1 and 2, the ratchet wrench of the present invention has a handle portion 10 and a head portion 20. The head portion 20 has a top plane 21 and a bottom plane 22. The head portion 20 has a bottom plane 22
A cylindrical cavity 23, which is a first cavity, is formed inwardly from. The cavity 23 has a central axis. At the position of the upper plane 21, the annular protruding edge 24,
It is formed so as to project into the cavity 23.

Further, the head portion 20 is formed with a circular opening 25 having an upper flat surface 21 as an opening. The mouth opening 25 has a central axis. The center axis of the cavity 23 and the center axis of the opening 25 have a predetermined distance. A joining hole 26 is formed between the cavity 23 and the opening 25, and the joining opening 26 penetrates the circular opening 25 and the cylindrical cavity 23.

At the center of the circular opening 25, a circular hole 27 is formed concentrically with the opening 25. Cylinder shaped cavity 2
An annular clip groove 28 is formed at a position near the bottom plane 22 among the three. As shown in FIGS. 3 and 4, in the central portion of the head portion 20, a semi-cylindrical cavity 29 that is a second cavity is provided in the bottom plane 22 of the head portion 20.
It is formed from the inside to the inside. The semi-cylindrical cavity 29 locally overlaps with the cylindrical cavity 23 and is connected to the cylindrical cavity 23.

Numeral 30 is a hole which is closed on one side. The handle portion 10 is located closer to the handle portion 10 of the wall of the circular hole 27.
And is inclined toward the handle portion 10 side with respect to the bottom plane 22 of the head portion 20. As shown in FIG. 2, one steel ball 33 is fitted in the hole 30, and the steel ball 33 projects from the opening of the hole 30 by the force of the spring 32 in the hole 30.

Reference numeral 40 denotes a ratchet wheel, which has a cylindrical shape, is provided in the cylindrical cavity 23, and is in contact with the annular protruding edge 24. The ratchet wheel 40 has a concave outer peripheral surface 41.
1 has a plurality of teeth 42 formed uniformly and at intervals, and has an uneven arc-shaped structure.

An annular groove 43 is formed on the outer peripheral surface of the ratchet wheel 40 at a position close to the bottom and corresponding to the annular clip groove 28 of the head portion 20. A clamp ring 44 is fitted in the annular groove 43. With the clamp ring 44 fitted in the annular clip groove 28 of the head portion 20, the ratchet wheel 40 is rotatable about the central axis of the cylindrical cavity 23. The clamp ring 44 has an ear portion 45 extending outward. As shown in FIGS. 2 and 6, the ear portion 45 is fitted in the semicircular cavity 29, and the position of the ratchet wheel 40 is determined.

The ratchet wheel 40 has an inner hole 46 for tightening parts such as bolts, screws and nuts. Ribs 47 are radially formed in the inner hole 46 in the radial direction. The ribs 47 come into contact with bolts, screws, nuts, etc., and give a screwing force. 50 is a pawl,
It has a surface 51. As shown in FIGS. 2 to 4, a plurality of teeth 52 are formed on the surface 51 at uniform intervals. The surface 51 has an uneven arcuate structure. The pawl 50 is arranged in the semi-cylindrical cavity 29, and the surface 51 of the uneven arc-shaped structure meshes with the teeth 42 of the uneven arc-shaped structure of the ratchet wheel 40 described above.

Two stoppers 53 are formed on the upper surface of the pawl 50. Between the two stoppers 53, the gap 5
4 is formed. The size of the pawl 50 is slightly smaller than that of the semi-cylindrical cavity 29. Therefore, as shown in FIGS. 3 and 4, the pawl 50 has a semi-cylindrical cavity 29.
You can move a little inside. As shown in FIG. 3, when the pawl 50 is arranged near the lower side (A side) of the semi-cylindrical cavity 29 (in the first position state), the ratchet wheel 40 corresponds to the ratchet wheel 40. When the handle portion 10 is turned in the opposite direction (counterclockwise CC), the pawl 5 located between the ratchet wheel 40 and the head portion 20.
0 meshes with the teeth 42 of the concave-convex arc structure of the ratchet wheel 40, transmits the movement of the head portion 20 to the ratchet wheel 40, and the ratchet wheel 40 rotates in the opposite direction (counterclockwise CC).

When the handle portion 10 is rotated in the forward direction (that is, the clockwise direction C), the pawl 50 moves to the upper side of the semi-cylindrical cavity 29, and the pawl 50 and the ratchet wheel 40 have a toothed structure having an uneven arc. 42 is disengaged.
Therefore, the handle portion 10 idles. Pawl 50
However, as shown in FIG. 4, when the handle portion 10 is arranged closer to the upper side (B side) of the semi-cylindrical cavity 29 (in the second position state), the handle portion 10 is moved in the forward direction (clockwise direction). Ratchet wheel 4 when turned to C)
When 0 is rotated in the forward direction (clockwise direction C) and the handle portion 10 is rotated in the reverse direction (counterclockwise direction CC), the handle portion 10 rotates idly.

Reference numeral 60 denotes a knob, which has a rod 61. The knob 60 is rotatably provided by fitting the rod 61 into the circular hole 27. The knob 60 is provided with a handle 62 for turning the knob. The key 63 fixed to the knob 60 is fitted into the joint hole 26, and the range of rotation of the knob 60 is limited. As shown in FIG. 5, a pair of recesses 64 are provided on the circumferential surface of the rod 61 at intervals in the circumferential direction. By engaging either of the recesses 64 with the steel ball 33, the knob 60
The rotational position of the (rod 61) is determined to be one of the two positions. An annular groove 65 is formed near the lower end of the rod 61. In this annular groove 65, the retaining locking plate 6
6 is fitted. The retaining locking plate 66 supports the bottom surface of the pawl 50.

Reference numeral 70 denotes an actuating means, which is formed by processing a wire rod, has a ring fitted in the rod 61, and has one end 71 and the other end 72. One end 71 is bent upward. The other end 72 extends laterally. The actuating means 70 has a ring fitted to the rod 61, and the one end 71 bent upward is fixed to the knob 60 and attached to the knob 60. The other end 72 extending laterally is
It is located in the gap 54 between the two stoppers 53 on the upper surface of the pawl 50.

When the knob 60 is pinched and the actuating means 70 is rotated, the steel ball 33 is fitted in the recess 64 so that the actuating means 70 is positioned and the other end 72 extending laterally is formed.
Moves pawl 50 within semi-circular cavity 29. The direction in which the ratchet wheel 40 rotates can be controlled according to the position of the pawl 50 in the cavity 29, that is, according to the state of joining of the pawl 50 to the ratchet wheel 40.

Here, since all the teeth 52 of the pawl 50 mesh with the teeth 42 of the ratchet wheel 40, the pawl 5
The meshing strength between 0 and the ratchet wheel 40 is significantly improved. Furthermore, both teeth 42 and 52 have an uneven arc shape, the meshing surface is large, and the meshing strength is further enhanced. The above description is one of the ideal embodiments for explaining the present invention and does not limit the present invention in any form. Therefore, any improvements and modifications that are in the same spirit as the present invention are included in the protected area of the present invention.

[0023]

As described above, according to the ratchet wrench of the present invention, both the ratchet wheel and the pawl have a plurality of teeth, and the teeth are meshed with each other, whereby the meshing strength can be increased. Further, since the plurality of teeth of the pawl mesh with the teeth of the ratchet wheel at the same time, the meshing strength between the pawl and the ratchet wheel can be increased.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a ratchet wrench according to an embodiment of the present invention.

2 is a cross-sectional arrow view taken along the line 2-2 in FIG.

3 is a cross-sectional arrow view taken along the line 3-3 in FIG.

4 is a cross-sectional arrow view taken along the line 3-3 in FIG.

5 is a cross-sectional view taken along the line 5-5 in FIG.

FIG. 6 is a bottom view of the ratchet wrench.

[Explanation of symbols]

 10 Handle Part 20 Head Part 21 Upper Plane 22 Bottom Plane 23 Cylindrical Cavity (First Cavity) 24 Annular Edge 25 Opening 26 Joining Hole 27 Circular Hole 28 Annular Clip Groove 29 Semi-Cylindrical Cavity (First Cavity 2 cavity) 30 hole on one side 32 spring 33 steel ball 40 ratchet wheel 41 recessed outer peripheral surface 42 multiple teeth 43 annular groove 44 clamp ring 45 ears 46 inner hole 47 rib 50 pawl 51 surface 52 multiple teeth 53 2 One stopper 54 Gap 60 Knob 61 Rod 62 Handle 63 Key 70 Actuating means 71 One end bent above 72 The other end extending laterally

Claims (7)

[Claims] 1. A handle portion (10), a first cavity (23) and a second cavity (29).
And a head portion (2
0), a ratchet wheel (40) having a plurality of concave and convex arc-shaped teeth (42) on its outer peripheral surface and rotatably provided in the first cavity (23), and the second cavity. (29) is provided with a pawl (50) provided in the pawl (50), which is the ratchet wheel (40).
A tooth for controlling the direction of rotation of the toothed wheel, the toothed wheel having a plurality of teeth (52) having an irregular arc shape and being selectively operated,
A ratchet wrench characterized in that the plurality of teeth (52) are strongly meshed with the plurality of teeth (42) of the ratchet wheel (40). 2. A handle portion (10), a first cavity (23) and a second cavity (29).
And a head portion (2
0), a ratchet wheel (40) having a plurality of teeth (42) on its outer peripheral surface and rotatably provided in the first cavity (23) in the forward and reverse directions, and its surface. And a plurality of teeth (52) that can be meshed with the teeth (42) to control the direction of rotation of the ratchet wheel.
And a pawl (50) rotatably provided in the second cavity (29) and an actuating means (70) for converting the pawl (50) into the first and second positions. When the pawl (50) is set to the first position state in the second cavity (29) by the actuating means (70), when the head portion (20) is rotated in the forward direction, The ratchet wheel (40) can rotate in the forward direction, and when the head portion (20) is rotated in the reverse direction, the ratchet wheel (40) becomes idle, and the ratchet (50) is operated by the actuating means (70). When the head portion (20) is turned in the opposite direction when the head portion (20) is set to the second position state in the second cavity (29), the ratchet wheel (40) can rotate in the opposite direction, and the head portion (20) can be rotated in the opposite direction. Correct (20) Turn to the direction, the ratchet wheel (4
Ratchet wrench characterized by having a structure in which 0) becomes idle. 3. A knob (62) is rotatably provided on the head portion (20), and the actuating means (70) is connected to the knob (62) to rotate the knob (62). Together with the operating means (7
0) is moved, the knob (62) has an extended rod (61) and is joined to the pawl (50), and by turning the knob (62), the pawl (5) is moved.
0) is set to the state of the first and second positions in the second cavity (29).
The described ratchet wrench. 4. A flat surface (2) above the head portion (20).
1) is provided with a circular opening (23), and a circular hole (27) is formed at the center of the circular opening (23), and the circular opening (23) and In order to penetrate the first cavity (23), a joint hole (2
6) is formed, the knob (62) is rotatably arranged in the circular opening (23), and the rod (61) of the knob is rotatably inserted in the central circular hole (27). A ratchet wrench according to claim 3, characterized in that the actuating means (70) comprises a ring attached to the rod (61). 5. The knob (62) has a key (63), and the key (63) is fitted in the joint hole (26) to limit the turning range of the knob (62). The ratchet wrench according to claim 4, wherein the ratchet wrench is configured as described above. 6. The head portion (20) has a bottom plane (2).
2) and has a pair of recesses (64) on the outer peripheral surface of the rod (61) of the knob (60), and the wall of the circular hole (27) approaches the handle portion (10) side. Extending in the direction, the head portion (20) has a one-sided closed hole (30) inclined toward the handle portion (10) with respect to the bottom plane (22), and the spring (31) in the hole (30). ), One steel ball (33) is slightly projected from the hole (30), and the recess (6) of the rod (61) of the knob (60) is
The ratchet wrench according to claim 4, wherein the ratchet wrench is configured to be fitted with 4). 7. The pawl (50) has two
Having one stopper (53) and a gap (54) between the two stoppers (53), the extended end (7) of the ring of said actuating means (70)
2) is just inside the gap (54) and when the stopper (53) is moved, the pawl (5)
0) is the first and second in the second cavity (29)
The ratchet wrench according to claim 3, wherein the ratchet wrench is configured to be selected at the position.