JPH08141920A - Ratchet spanner - Google Patents

Abstract

PURPOSE: To provide a ratchet spanner by which a bolt nut can be simply fastened even if fastening force is small. CONSTITUTION: A ratchet gear plate 9 whose unidirectional rotation is check by a ratchet mechanism is provided in a head part 3, and an auxiliary rotary plate 53 to co-rotate with the ratchet gear plate 9 is installed so as to be freely mountable and demountable to a ratchet spanner 41 where a socket 47 which coaxially rotates with the ratchet gear plate 9 and has an engaging hole part 49 to engage with a fastening member 39 is installed on the ratchet gear plate 9 so as to be freely mountable and demountable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ratchet spanner for tightening bolts and nuts.

[0002]

2. Description of the Related Art As a tool used for tightening and loosening bolts and nuts, a ratchet spanner 1 as shown in FIG.
Is known (see Japanese Utility Model Publication No. 40-16550).

The ratchet spanner 1 is composed of a head 3 provided with a ratchet mechanism and a grip portion 5 protruding from the head 3. The head 3 is provided with a ratchet gear plate 9 which is rotatable in both forward and reverse directions. The ratchet gear plate 9 is formed with an engagement hole portion 7 that engages with the head of the bolt and the nut, and the engagement hole portion 7 rotates coaxially with the ratchet gear plate 9. Ratchet teeth 9a are formed on the outer periphery of the ratchet gear plate 9, and two ratchet pawls 11 and 13 are provided on the grip 5 side of the ratchet gear plate 9 so as to face each other at a predetermined interval. The ratchet pawls 11 and 13 are rotatably supported about the rotary shafts 11a and 13a so that the tips of the ratchet pawls 11 and 13 can mesh with the ratchet teeth 9a.

Between the ratchet pawls 11 and 13, a rotating plate 15 having orthogonal linear portions 17 and 19 formed on one side of the disk is provided.
Is rotatably provided. Both linear parts 1 of the rotating plate 15
7 and 19 are provided so as to be able to abut on the inner sides of both ratchet pawls 11 and 13, and the tip of one ratchet pawl 13 is the ratchet tooth 9a when one straight portion 19 and one ratchet pawl 13 are in contact with each other. Mesh with the other ratchet claw 11
Is not in contact with the straight portion 11 and is in a state of being disengaged from the ratchet teeth 9a. Spring 2 for ratchet pawls 11 and 13
3, 25 are connected to each other, and the ratchet pawls 11, 1 abutting on the linear portions 17, 19 by the springs 23, 25 are connected.
The tip of 3 is biased inward. As a result, in the state shown in FIG. 3, when a rotational force in the direction of arrow A is applied to the ratchet gear plate 9, the inward movement of the tip of the ratchet pawl 13 in contact with the linear portion 19 is blocked, The ratchet gear plate 9 does not rotate. On the contrary, ratchet gear plate 9
When a rotational force acts in the direction opposite to the arrow A direction, the ratchet gear plate 9 rotates as the ratchet gear plate 9 rotates because the tip of the ratchet pawl 13 in contact with the linear portion 19 is allowed to move outward. The tip of the ratchet pawl 13 is the spring 2
Immediately returns to the inside by the urging force of 5. That is, the ratchet gear plate 9 is prevented from rotating only in one direction (direction A).

An operating pin 27 is provided on the rotary plate 15 so as to project. When the free end of the operational pin 27 is pressed vertically in the figure, the rotary plate rotates against the biasing force of the springs 23 and 25. Move. As a result, the linear portion 19 on one side is separated from the ratchet pawl 13, the linear portion 17 on the other side and the ratchet pawl 11 contact, and the rotation direction in which the ratchet gear plate 9 is blocked is switched.

According to such a ratchet spanner 1, the ratchet gear plate 9 can be selectively made unrotatable in only one direction, and the grip portion 5 is reciprocated while the engagement hole 7 is engaged with a bolt or the like. The bolts and the like can be tightened and loosened only by performing the above.

[0007]

However, in such a ratchet spanner 1, when the tightening force of the bolt or the like is small as in the initial tightening, the ratchet pawl 11 is constantly operated by the urging force of the springs 23 and 25. , 13 may mesh with the ratchet teeth 9a, and when the grip 5 is reciprocated, the bolts and the like may rotate together and tightening may not be performed. Therefore, in the initial tightening, the grip portion 5
It was necessary to hold the handle and rotate the entire ratchet spanner 1 in the tightening direction, or the operator must tighten the bolt and the like by hand.

For example, as shown in FIG. 4, the jig 35 is fixed to the surface 31a of the working plate 31 by bolts 37 protruding from the bottom of the jig 35 in bolt holes 33 penetrating the working plate 31.
Through the bottom surface of the work plate 31 as shown in FIG.
When the nut 39 is fastened to the bolt 37 from the side, the entire ratchet wrench 1 must be rotated on the back surface 31b side of the work plate 3 or the nut 39 must be tightened to the bolt 37 by hand. It was complicated and it took time to tighten it. Further, the back surface 31b of the work plate 31
In some cases, a sufficient working space cannot be secured on the side, and in such a case, there is no other method than tightening the nut 39 by hand, and workability is particularly poor.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a ratchet spanner capable of easily and quickly tightening or loosening even when the tightening force is small.

[0010]

According to a first aspect of the present invention, a ratchet gear plate, which is prevented from rotating in one direction by a ratchet mechanism, is provided at a head portion of the ratchet gear plate, and the ratchet gear plate rotates coaxially with the ratchet gear plate and a fastening member. In a ratchet spanner, in which a socket having an engagement hole portion that engages with the ratchet gear plate is detachably attached to the ratchet gear plate, an auxiliary rotating plate that rotates together with the ratchet gear plate is detachably attached. It is what

The invention according to claim 2 is the ratchet spanner according to claim 1, wherein the socket is mounted on a ratchet gear plate through a rod-shaped connecting portion, and the auxiliary rotary plate is It has a hole portion that is inserted into the connecting portion, and is mounted between the ratchet gear plate and the socket by attaching the socket from above with the hole portion being inserted into the connecting portion. is there.

A third aspect of the present invention is the ratchet spanner according to the first or second aspect, wherein the outer peripheral surface of the auxiliary rotary plate projects from the head portion and is non-slip on the outer peripheral surface. It is characterized in that it is formed in a disk shape having a portion.

[0013]

According to the first aspect of the invention, at the beginning of tightening or at the end of loosening when the tightening force is small, the head of the ratchet is grasped by the hand and the auxiliary rotary plate is rotated by the fingers. As a result, the ratchet gear plate and the socket rotate, so that the fastening member can be tightened or loosened.

When the auxiliary rotary plate is not needed, the auxiliary rotary plate can be removed and used, and when tightening or loosening fastening members of different sizes, only the socket is replaced. The same auxiliary rotating plate can be used.

According to the second aspect of the present invention, since the auxiliary rotary plate is mounted by inserting the hole of the auxiliary rotary plate into the connecting portion and mounting the socket from above, the connecting portion for mounting the socket is provided. Auxiliary rotary plate can be installed by utilizing it.

According to the third aspect of the invention, since the auxiliary rotary plate is formed in a disk shape having an outer peripheral surface protruding from the head and an anti-slip portion on the outer peripheral surface, the head can be gripped by hand. , The auxiliary rotary plate can be easily rotated with a finger.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a ratchet spanner according to an embodiment of the present invention, and FIG. 2 is a side view of the ratchet spanner of FIG. The same parts as those of the related art are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, a ratchet spanner 41
Is composed of a head portion 3 and a grip portion 5 as in the conventional case, and the head portion 3 is provided with a ratchet gear plate 9 that is selectively prevented from rotating in one direction by a ratchet mechanism. The ratchet gear plate 9 includes a ratchet gear plate 9
A rod-shaped connecting portion 43 having a cross-section that is coaxially rotated is projected. The socket 47 is formed at one end with an engagement hole 49 that engages with the nut 39 as a fastening member.
It is removably mounted on the ratchet gear plate 9 via 3.

Between the ratchet gear plate 9 and the socket 47, an auxiliary rotary plate 53 that rotates together with the ratchet gear plate 9 is detachably attached. The auxiliary rotary plate 53 is formed in a disk shape, and a plurality of groove portions 54 as slip preventing portions are formed on the outer peripheral surface 53a thereof. A central portion 57 of the auxiliary rotary plate 53 is formed in a thin shape, and a rectangular hole portion 55 that is inserted into the connecting portion 43 is formed in the central portion 57. With the connecting portion 43 inserted through the hole 55, the center of the auxiliary rotary plate 53 and the rotation axis of the ratchet gear plate 9 coincide with each other, and the outer peripheral surface 53a of the auxiliary rotary plate 53 projects outward from the head 3. .

As shown in FIG. 2, inside the other end of the socket 47, there is formed a fitting portion 48 having a rectangular cross section into which the connecting portion 43 is fitted. The connecting portion 43 is provided with a locking projection 45, and the fitting portion 48 is provided with an engaging recess 51 correspondingly.

When the ratchet spanner 41 is used, first, the hole 55 of the auxiliary rotary plate 53 is inserted into the connecting portion 43, and the socket 47 is fitted and pressed from above. When the socket 47 is fitted, the engaging recess 51 of the fitting portion 48
Are aligned with the locking projections 45. As a result, when the lower end of the socket 47 comes into contact with the auxiliary rotary plate 53, the engaging projection 45 engages with the engaging recess 51, and the auxiliary rotary plate 53 and the socket 47 can rotate together with the ratchet gear plate 9. Mounted.

When tightening the nut 39, the engaging hole 49
The nut 39 is engaged with, the nut 39 is fitted to the mating bolt, the head 3 is grasped by hand, and the outer peripheral surface 53a of the auxiliary rotary plate 53 protruding from the head 3 is fed by a finger to rotate the auxiliary rotary plate 53. . As a result, the ratchet gear plate 9 and the socket 47 rotate, and the nut 39 is tightened.

At the final stage of tightening when the tightening amount of the nut 39 reaches a predetermined amount, a large tightening force is required. Therefore, the grip portion 5 is gripped and reciprocated to sufficiently tighten the nut 39.

In this way, such ratchet spanner 41
According to the report, in the initial tightening, the ratchet spanner 41
The nut 39 can be tightened easily and quickly without the need for complicated operations such as turning the whole and tightening the nut 39 by hand.

Further, since the outer peripheral surface 53a of the auxiliary rotary plate 53 projects from the head 3 and is formed in a disk shape having a plurality of groove portions 54 on the outer peripheral surface 53a, the auxiliary rotary plate 53 can be easily rotated. Therefore, the nut 39 can be tightened more easily.

When the auxiliary rotary plate 53 is not needed, it can be removed and used. When tightening nuts of different sizes, only the socket 47 is replaced with the same one. Since the auxiliary rotary plate 53 can be used, it is highly versatile.

Furthermore, since the hole 55 of the auxiliary rotary plate 53 is inserted into the connecting portion 43 and the socket 47 is attached from above, the auxiliary rotary plate 53 is mounted.
Auxiliary rotary plate 5 using the connecting portion 43 for mounting 7
3 can be attached, and the ratchet spanner 41 can have a simple structure.

When the nut 39 is loosened, the auxiliary rotary plate 53 is rotated in the latter stage of loosening when the loosening amount of the nut 39 reaches a predetermined amount, whereby the same action and effect as at the time of tightening can be obtained. .

[0030]

As described above, according to the invention described in claim 1, since the auxiliary rotary plate can be rotated at the initial tightening or the final tightening period when the tightening force is small, the ratchet spanner can be rotated as a whole. Since it is not necessary to tighten or loosen the fastening member by hand, tightening or loosening of the fastening member can be performed easily and quickly.

Further, when the auxiliary rotary plate is not required, it can be removed and used, and when tightening or loosening the fastening members of different sizes, only the socket is replaced and the same auxiliary rotary plate is used. Since a plate can be used, it is highly versatile.

According to the invention of claim 2, claim 1
In addition to the effects of the invention described in (1), the auxiliary rotating plate can be attached by utilizing the connecting portion for mounting the socket,
The ratchet spanner can have a simple structure.

According to the invention described in claim 3, according to claim 1
Alternatively, in addition to the effect of the invention described in claim 2, since the auxiliary rotary plate is formed in a disk shape having an anti-slip portion on the outer peripheral surface protruding from the head, the auxiliary rotary plate can be easily rotated by fingers. The fastening member can be tightened or loosened more easily.

[Brief description of drawings]

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

FIG. 2 is a side view of the ratchet spanner of FIG.

FIG. 3 is a plan view showing a conventional ratchet spanner.

FIG. 4 is a perspective view illustrating a method of fixing a jig to a work plate.

FIG. 5 is a perspective view showing a usage state of a conventional ratchet spanner.

[Explanation of symbols]

 3 Head 9 Ratchet Gear Plate 39 Nut (Fastening Member) 41 Ratchet Spanner 43 Connecting Part 47 Socket 49 Engagement Hole 53 Auxiliary Rotating Plate 53a Outer Surface 54 Groove (Slip Prevention) 55 Hole

Claims (3)

[Claims] 1. A socket having a ratchet gear plate, which is prevented from rotating in one direction by a ratchet mechanism, at a head portion thereof, the socket having an engaging hole portion that rotates coaxially with the ratchet gear plate and engages with a fastening member. However, in the ratchet spanner detachably mounted on the ratchet gear plate, an auxiliary rotating plate that rotates together with the ratchet gear plate is detachably attached. 2. The ratchet spanner according to claim 1, wherein the socket is mounted on a ratchet gear plate via a rod-shaped connecting portion, and the auxiliary rotary plate is inserted into the connecting portion. A ratchet spanner which has a hole and is mounted between the ratchet gear plate and the socket by mounting the socket from above with the hole inserted into the connecting portion. 3. The ratchet spanner according to claim 1 or 2, wherein the auxiliary rotary plate is formed in a disk shape having an outer peripheral surface protruding from the head portion and a non-slip portion on the outer peripheral surface. Ratchet spanner characterized by doing.