JPS5938994Y2 - Ratchet type torque wrench - Google Patents

Description

[Detailed description of the invention] The present invention is equipped with a ratchet mechanism that tightens bolts, nuts, etc. only when rotating in one direction, and allows free rotation when rotating in the other direction. The present invention relates to an improvement in a ratchet type torque wrench in which a head member rotates when the torque reaches a predetermined value to notify the operator of this fact.

First, the general structure of this type of ratchet type torque wrench will be explained.

In FIGS. 1 to 3, reference numeral 1 indicates a hollow pipe, and numeral 2 indicates a head member. Using a pivot 3a at the tip of the hollow pipe 1, the head member 2 is placed at an intermediate position between the head 4 and the tail 10. It is pivoted.

A fitting body 5 is rotatably supported on the head 4 of the head member 2, and a ratchet pawl 6 is pivotally attached to the head 4 by a support shaft 3b.

The illustrated fitting body 5 is formed of a cylindrical member having a hexagonal hole, and is configured to fit a bolt head or a nut, but the fitting body 5 is not limited thereto.

Also, a ratchet wheel 7 is integrally attached to the fitting body 5,
The ratchet pawl is engaged with GVC so that the fitting body 5 can freely rotate in only one direction.

The illustrated ratchet pawl 6 is configured to be able to switch the free rotation direction of the fitting body 5, and 6a and 6a are a pair of protrusions for this purpose, 6b is a ball engaging protrusion, 8 is a ball, and 9 is a ball 8. It is a spring for supporting the bullet.

The tail portion 10 of the head member 2 is located within the tunnel 1, and its tail end 11 is connected to a thrust member 12 disposed within the tunnel 1 via a toggle 13.

A spring receiver 14 is screwed onto the rear end of the tunnel 1, and a compression spring 15 is interposed between the spring receiver 14 and the thrust member 12.

The toggle 13 is arranged so as to be inclined at a predetermined angle θ with respect to the axis of the tunnel 1.

By the way, FIG. 3 shows a conventional example. In the conventional example, the operating torque value at which the ratchet type torque wrench operates is determined by the position of the operator in the tunnel 1 (as shown in the third diagram).

), and the range of this variation becomes large.

The purpose of the present invention is to reduce the above-mentioned fluctuation range, and in order to distantly achieve this purpose, the center of the fitting body 5 and the pivot axis 3a
This was devised as a result of finding out that it is effective to reduce the distance t between the two.

By the way, in the conventional ratchet type torque wrench, as shown in FIG. 3, the ratchet pawl 6 and the support shaft 3b are disposed between the pivot shaft 3a and the fitting body 5, so that the t can be shortened. It was difficult.

Therefore, the fluctuation range of the operating torque value due to the change in L is large, and it is extremely difficult to tighten the fastened object a, such as a bolt, with a uniform torque.

In order to correct the drawbacks of the above-mentioned conventional examples, the present invention makes it possible to achieve the above t by configuring the pivot shaft 3a and the support shaft 3b with the same shaft 3, as shown in FIGS. 1 and 2. This is made as short as possible to reduce the fluctuation range of the operating torque value due to changes in L.

As a result, when the wrench of the present invention is used, the uniformity of the torque when tightening the object a to be fastened, such as a bolt, can be significantly improved compared to the conventional example.

Furthermore, in the conventional example, since the pivot shaft 3a and the support shaft 3b were formed separately, there was a drawback that the structure became complicated and the manufacturing cost increased, but according to the present invention, both the shafts 3a are formed with one shaft 3. , 3b, the structure can be simplified and manufacturing costs can be reduced.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional plan view, FIG. 2 is a front view, and FIG. 3 is a longitudinal sectional plan view of a conventional example. 1...Drill pipe, 2...Head member, 3.
...Axis, 3a...Axis, 3b...
・Support shaft, 4... Head, 5... Fitting body, 6... Ratchet pawl, 7... Ratchet wheel, 10...・Tail, 12...
・Thrust member, 13... Toggle, 15...
...Compression spring.

Claims (1)

[Scope of utility model registration request] A head member is pivotally attached to the tip of the digging pipe at an intermediate position between the head and the tail, and a thrust member biased toward the tip by a compression spring is disposed inside the digging pipe, so that the tail of the head member and the The head member is connected to the thrust member via a toggle, and a fitting body having a ratchet wheel is rotatably supported on the head of the head member, and a ratchet pawl that engages with the ratchet wheel is pivotally connected to the head member. A ratchet type torque wrench characterized in that a pivot shaft for pivotally connecting a head member to a bore pipe and a support shaft for pivotally connecting a ratchet pawl to the head member are constructed on the same axis.