JP2001179650A - Torque wrench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of tightening after the relief of torque by providing a clutch conducting idling operation if predetermined torque is achieved, in a torque wrench equipped with a torque mechanism for predetermining tightening torque. SOLUTION: The torque mechanism 1 for predetermining the tightening torque is mounted on a head 3 of a handle 2. A clutch mechanism 5 for shutting down tightening force applied to a shaft 4 if the torque predetermined with the torque mechanism 1 is achieved is fitted on the head 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque wrench, and more particularly to a manual torque wrench.

[0002]

2. Description of the Related Art Conventionally, a torque wrench of this type usually has a torque mechanism for setting a tightening torque built in a handle (for example, Japanese Patent Publication No. 52-242).
No. 76, JP-A-7-80779, etc.).

[0003]

When a screw tightening operation is performed using a torque wrench of this type, even after the operator reaches a predetermined torque value, the handle is further rotated due to carelessness or inertia. For this reason, it is desirable that this type of wrench is formed so that when the set torque is released, the screw or the like cannot be further tightened.

[0004] However, as described above, the conventional product merely has a torque mechanism provided on the handle, so that in the case of the conventional product, the screw is easily tightened even after the set torque is released. As a result, when the conventional product is used, the screw tightened state varies depending on the operator, and the reliability of the tightened state is easily impaired.

[0005] The present invention has been proposed in view of such problems of conventional products. Accordingly, a technical problem of the present invention is to provide a torque wrench including a torque mechanism for setting a tightening torque, including a clutch that idles when the set torque is reached, and preventing a tightening action after the torque is released. It is to provide a formed torque wrench.

[0006]

The present invention employs the following technical means in order to solve the above-mentioned problems.

That is, according to the present invention, as shown in FIG. 1, a torque mechanism 1 for setting a tightening torque includes a handle 2.
The head 3 is provided with a clutch mechanism 5 provided on the head 3 for cutting the tightening force applied to the shaft 4 when the torque set by the torque mechanism 1 is reached. 1).

In this case, according to the present invention, the clutch mechanism 5 includes a lower clutch plate 51 rotatably fitted at the position of the shaft 4 in the head 3 so that the shaft 4 has the same axis as the shaft 4 and a lower clutch plate 51. The upper clutch plate 52 is formed by engaging teeth 51a radially formed on the upper surface of the clutch plate 51 on the side and the upper clutch plate 52 engaged with the engagement teeth 51a. The torque mechanism 1 is concentrically fitted to the shaft 4 and is formed to be operable externally to adjust the elastic force of the leaf spring 11 for pressing the upper clutch plate 52 downward. It is preferably formed by the torque setting section 12 (claim 2).

In the case of the present invention, since the clutch mechanism 5 and the torque mechanism 1 can be made compact, there is an advantage that the head 3 is not made heavy. In the case of the present invention,
The number of the engagement teeth 51a of the upper clutch plate 52 and the lower clutch plate 51 may be appropriately selected in consideration of the diameter of each clutch plate, the spring pressure of the torque mechanism 1, and the like.

Further, in the present invention, it is preferable that teeth 51c for engaging with the ratchet 6 are formed on the outer peripheral surface of the lower clutch plate 51 in a gear shape over the circumferential direction.

The product of the present invention has a ratchet function, and thus has an advantage that the tightening operation can be facilitated.

[0012]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1 and the like, reference numeral 1 denotes a torque mechanism for setting a tightening torque. This torque mechanism 1 is provided on the head 3 of the handle 2. According to the present invention, the head 3 includes the clutch mechanism 5 for cutting off the tightening force applied to the shaft 4 when the torque set by the torque mechanism 1 is reached.

The above-mentioned clutch mechanism 5 is formed of a lower clutch plate 51 and an upper clutch plate 52.
The lower clutch plate 51 is rotatably fitted to the position of the shaft 4 in the head 3 with the same axis as the shaft 4.

The lower clutch plate 51 is provided on the upper surface thereof.
The engagement teeth 51a are formed radially in the circumferential direction. In this embodiment, the upper surface of the lower clutch plate 51 is radially divided into twelve equal parts, and the engaging teeth 51a have an angle A of 1 in this embodiment.
It is selected at 00 degrees.

As shown in FIGS. 4 to 6, the lower clutch plate 51 has teeth 51c which engage with the ratchet 6 (see FIG. 3) on the outer peripheral surface of the enlarged diameter portion 51b. Are formed in a gear shape over the circumferential direction. As shown in FIG. 6, a ball groove 51d is formed on the lower surface of the lower clutch plate 51 in an annular shape in the circumferential direction.
Are formed so that the contact friction with the inner surface of the head 3 can be reduced by a large number of steel balls 51e stored in the head.

In this embodiment, the diameter of the lower clutch plate 51 is selected to be 25 (mm) on the upper surface, and the diameter of the large diameter portion 51b on which the teeth 51c are formed is 29 (mm). In this embodiment, the tooth 51c is a large-diameter portion 51b.
Is divided into 30 equal parts, and the depth of the groove is 0.9.
(Mm).

The upper clutch plate 52 is shown in FIGS.
As shown in FIG. 9 and the like, meshing teeth 52a meshed with the engaging teeth 51a are radially provided on the lower surface. The upper clutch plate 52 is engaged with the upper end of the shaft 4 and is fitted concentrically on the upper end of the shaft 4. 52b (see FIG. 9) is a meshing portion with the upper end of the shaft 4. The toothed portion 52b is formed by forming the inner peripheral surface of the through hole 52c in a gear shape.

As shown in FIG. 1, the torque mechanism 1 has a leaf spring 11 for pressing the upper clutch plate 52 downward, and can be externally operated to adjust the elastic force of the leaf spring 11. The torque setting section 12 is formed. Reference numeral 13 denotes a spring receiving plate for receiving the leaf spring 11.

The above-mentioned leaf spring 11 is connected to the upper clutch plate 5.
2 is locked inside the rising portion 52d formed on the peripheral edge of the rim 2, and is formed in the shape of a prone bowl. Also, torque setting unit 12
In this embodiment, is formed by a hexagonal bolt bolted to the top of the cap-shaped cover 7 so as to be vertically movable. The lower end of the bolt serving as the torque setting section 12 is in contact with the leaf spring 11.

Next, the operation of the present invention will be described. First, an operator sets a torque value with the torque mechanism 1. Specifically, the operation is performed by operating a hexagon socket head bolt to change the pressing state of the leaf spring 11. The torque value increases when the bolt as the torque setting unit 12 is tightened,
It becomes smaller when loosened.

Next, the operator fits, for example, a socket under the shaft 4 and turns the handle 2 to tighten bolts and the like. When the set torque is reached, the engagement teeth 51a of the lower clutch plate 51 push up the upper clutch plate 52 against the elastic force of the leaf spring 11, and as a result, the clutch is disconnected, and the handle 2 is disengaged. It rotates slightly in the tightening direction with the lower clutch plate 51. Thereafter, the upper clutch plate 52 and the lower clutch plate 51 are connected by the spring pressure of the leaf spring 11, and return to the screw tightenable state.

[0023]

As described above, according to the present invention, the torque mechanism for setting the tightening torque is provided on the head of the handle, and this head cuts the tightening force applied to the shaft when the torque reaches the set torque. It is provided with a clutch mechanism.

Therefore, according to the present invention, when the set torque is reached, the clutch is disengaged and the tightening force applied to the handle is cut, so that the tightening operation after the torque is released can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a preferred embodiment of a torque wrench of the present invention.

FIG. 2 is a side view of the torque wrench.

FIG. 3 is a sectional view of a principal part taken along line III-III in FIG. 1;

FIG. 4 is a front view of a lower clutch plate.

FIG. 5 is a plan view of a lower clutch plate.

FIG. 6 is a bottom view of the lower clutch plate.

FIG. 7 is a front view of the upper clutch plate.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a bottom view of the upper clutch plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torque mechanism 2 Handle 3 Head 4 Shaft 5 Clutch mechanism

Claims (3)

[Claims] 1. A torque mechanism for setting a tightening torque is provided on a head of a handle. When the torque set by the torque mechanism is reached, a clutch mechanism for cutting off a tightening force applied to a shaft is provided by the head. A torque wrench characterized by being provided. 2. The torque wrench according to claim 1, wherein
The clutch mechanism is located at the position of the shaft in the head,
A lower clutch plate rotatably fitted with the same axis as the shaft, and an upper clutch plate meshed with engaging teeth radially formed on the upper surface of the lower clutch plate in a circumferential direction. The upper clutch plate is meshed with the upper end of the shaft and fitted concentrically to the shaft, and a torque mechanism presses the upper clutch plate downward, and the leaf spring A torque wrench, comprising: a torque setting portion formed so as to be operable externally to adjust resilience. 3. The torque wrench according to claim 2, wherein:
A torque wrench characterized in that teeth engaging with a ratchet are formed in a gear shape over a circumferential direction on an outer peripheral surface of a lower clutch plate.