JP2577601B2 - Torque-sensitive rotary tool - Google Patents

Description

The present invention relates to a torque-sensitive rotary tool such as a torque wrench or a torque spanner having a tightening torque-sensitive mechanism for tightening bolts, nuts, and the like with a predetermined torque value. Things.

[Problems to be solved by conventional technology and invention]

Most of the conventional wrenches having a tightening torque sensitive mechanism use a pipe as a handle member of the main body as in Japanese Utility Model Publication No. 55-5979 and equip a tightening torque sensitive mechanism in the hollow portion of the pipe. ing.

The conventional tightening torque-sensitive rotary tool provided with a mounting torque-sensitive mechanism in a pipe has the following problems.

Originally, hand tools are made by forging steel, and when a strong tightening torque is required for use, the handle is hit with a hammer and tightened.

Due to this custom, the pipe structure has a disadvantage that the pipe is deformed when hit with a hammer, and the internal tightening torque sensing mechanism does not operate.

Embodiment of the present invention In a tool as shown in FIG. 1 in which a shino for bolt hole alignment must be provided at the end of a handle, the handle is joined to the pipe by some means when the handle is a pipe. However, there is a drawback in that it is impossible to inspect the internal tightening torque sensing mechanism if welding is performed and hard welding cannot be performed with screwing.

In order to accommodate the tightening torque sensing mechanism in the hollow space of the pipe, its components must be designed to be small with limited size, so the torque sensing value (torque regulation value) over time due to wear of the parts Is big.

Foreign matter such as pebbles and sand is difficult to enter easily into the pipe, but once foreign matter enters or rusts, repair at the user level is difficult.

Therefore, it is not suitable for civil engineering, construction, and outdoor work.

Even when the torque approaches the set value, there is no change in appearance in appearance, and the structure is such that the transmission of the torque value is notified by the feel of the hand and the hand, but the individual difference in the reflexes of the worker and the movement speed Depending on the size, over-torque of tightening due to inertia is inevitable.

It is impossible to commercialize a torque-sensitive rotary tool with forging technology.

The nut tightening spanner disclosed in Utility Model Record No. 354236 also has a tightening torque reaction mechanism of the above-described pipe interior type, and a device equipped with the tightening torque response mechanism is orthogonal to the handle. It has a structure that protrudes into the state, has a large mounting space and is inferior in operability, and has a drawback that the device equipped with the tightening torque sensitive mechanism interferes with work. It must be set low and is not practical.

Japanese Patent Publication No. Sho 14-7756 discloses a type in which an anti-shrinkable strip is attached to a handle. ,
The transmission of torque generated in the wrench cylinder is transmitted from the neck handle to the booster arm in a U-turn transmission method, so a tightening torque sensitive mechanism is not used, so it is limited to low torque specifications. Is not provided.

According to the present invention, in order to solve all of these problems, the main body has an integrated structure of a forged product, and the above-mentioned pipe structure is not used.

(B) In order to perform the above, the returning arm is provided in a state of crossing the handle in the middle of the handle, and the leading end of the returning arm is protruded to the side of the handle, and the leading end of the returning arm is provided. An anti-shrinkable strip is provided between the handle and the bearing protruding in the middle of the handle in parallel with the side of the handle.

(C) The tightening torque sensing mechanism is such that by rotating the handle in the nut tightening direction, the transmission of the torque generated in the wrench cylinder is transmitted from the neck handle to the return arm, and further reversely transmitted to the anti-shrinkage strip. The return arm is exposed so that it can be visually confirmed at the rotation position of the return arm that the tightening force of the nut has reached the regulated torque as a turn transmission type tightening torque sensitive mechanism. To be able to be visually confirmed by the worker in the working state, instead of the tactile sound or the regulating sound transmitted to the hand.

 The present invention has been completed by focusing on the three points a, b, and c.

[Means for solving the problem]

 The gist of the present invention will be described with reference to the accompanying drawings.

The tip of the handle 1 for rotation of the neck handle 4 connected to the main body 5 is superposed and the handle 1 is connected to the neck handle 4 so as to be rotatable. The return arm 2 is arranged in a state of crossing with the handle 1 in the middle of the operation, and the tip 2 ′ of the return arm 2 is
, And the base is axially attached to the handle 1, and the tip 2 ′ of the return arm 2 is provided rotatably with respect to the handle 1, and the side surface 2 ″ of the base of the return arm 2 is provided. Abuts on the distal end surface 4 'of the neck handle 4 and the anti-shrinkable ridge 3 is provided between the tip 2' of the return arm 2 and the support portion 13 protruding forward of the handle 1. The transmission of the torque generated in the wrench cylinder 6 is transmitted from the assembly 4 to the return arm 2 by turning the handle 1 in the nut tightening direction, and further reversing the direction. To provide a U-turn transmission type tightening torque sensitive structure a that is transmitted to the anti-shrinkage strip 3.
The return arm 2 is provided in an exposed state so that the tightening torque sensing mechanism a can visually confirm the tightening force of the nut 7 has reached the regulation torque at the rotational position of the return arm 2. The present invention relates to a torque-sensitive rotary tool that performs the following.

(Operation)

In FIG. 1, when the grip 1 is gripped and turned in the direction of the large arrow, the tip 2 'of the returning arm 2 protruding to the side of the grip 1 and the front side of the grip 1 Handle 1 and neck handle 4 via a tightening torque sensing mechanism a disposed between the bearing 13 and
And the nut 7 held inside the wrench cylinder 6 in the case of FIG.

When the nut 7 is tightened to a point where it can be tightened without further tightening, the torque-sensitive rotary tool is adapted to be able to sense the torque by the regulation, but the tightening torque sensing mechanism a of the present invention is By turning the handle 1 in the nut tightening direction, the transmission of the torque generated in the wrench cylinder 6 is transmitted from the neck handle 4 to the returning arm 2, and the direction is further reversed, and the U-turn is transmitted to the anti-shrinkage ridge 3. If a turning force is applied to the return arm 2 beyond the regulation torque, the tip 2 'of the return arm 2 will rotate by retracting the anti-shrinkage ridge 3 in the direction of the small arrow, as shown in FIG. When the tip 2 'of the arm 2 moves to a predetermined position, for example, the inner surface of the tip 2'
When it was visually confirmed that the angle was substantially perpendicular to (Y
The rotation is stopped on the assumption that the regulated torque has been reached. In this case, the repulsive force of the anti-shrinkage ridge 3 is adjusted in advance so that the regulation torque is reached when the inner side surface of the distal end 2 ′ of the return arm 2 is substantially perpendicular to the handle 1.

In this way, the rotation of the return arm 2 is visually grasped, and it is confirmed that the regulation torque has been reached when the return arm 2 has reached the predetermined rotation position. When such a structure is employed, the stopper 8 is provided. It is also possible to prevent excessive torque from being applied to the sensitive portion by providing a tightening torque adjusting screw rod 9 that can adjust the repulsive force of the anti-shrinkage strip 3, and to design the torque regulation value to be adjustable. It will be easier.

〔Example〕

FIGS. 1, 2, 3, 4 and 5 show a preferred first embodiment of the present invention,
The figure shows the second embodiment, in which the tip of the handgrip 1 for rotation is gathered on the neck handle 4 connected to the main body 5 and the handle 1 is rotatable with respect to the neck handle 4. A series of handgrips 1 for this rotation
In the middle of the movement, the returning arm 2 is arranged in a state of crossing the handle 1, and the distal end 2 ′ of the returning arm 2 is protruded to the side of the handle 1, and the base is axially attached to the handle 1 to return. The tip 2 ′ of the arm 2 is provided rotatably with respect to the handle 1, and the front side surface 2 ″ of the base of the return arm 2 abuts against the distal end surface 4 ′ of the neck handle 4, An anti-shrinkable ridge 3 is provided between the tip 2 ′ and the support 13 protruding forward of the handle 1 in a state parallel to the side of the grip 1, and the tightening force of the nut 1 is reduced. The present invention relates to a torque-sensitive rotary tool in which the return arm 2 is provided in an exposed state so that the regulation torque can be visually confirmed at the rotation position of the return arm 2.

It is desirable that the contact between the front side surface 2 "of the return arm 2 and the distal end surface 4 'of the neck handle 4 be in an engaged state because the rotation of the return arm 2 is ensured. The figure shows a case where the gears are designed in a meshed state.

In addition, the base of the return arm 2 is attached to the lower part of the handle 1 by an attachment plate 10.
A case is shown in which the returning arm 2 is inserted between the grip handle 1 and the shaft mounting plate 10 provided in the vertically opposed state, and is axially mounted on the shaft 11.

A spring support 12 is pivotally mounted on the distal end 2 'of the return arm 2 by a shaft 11', and is provided on the opposite side of the handle 1 on the front side.
13.A spring receiver 12 'is screwed onto the 13 so that it can be adjusted forward and backward.
Since a tightening torque sensing mechanism a (general term for the entire movable portion including the anti-shrinkable strip 3) having the anti-shrinkable strip 3 interposed therebetween is shown in FIG. A torque adjusting screw rod 9 is provided, and the strength of the regulating torque of the anti-shrinkage strip 3 is adjusted by screwing in and out by a driver.

Further, the rotation of the return arm 2 is set so as to reach a desired torque when the inner side surface of the distal end portion 2 'of the return arm 2 is located at the Y imaginary line orthogonal to the grip 1 as shown in FIG. However, it is also possible to confirm by movement of a component attached to the return arm 2. A design is also possible in which a mark is provided on the return arm 2 and a scale is displayed at an appropriate position on the corresponding handle 1 so that the rotation angle of the return arm 2 can be seen at a glance. Returning arm 2
It is also possible to design such that when it rotates and reaches an appropriate torque regulation value, it emits a signal sound or turns on the emitting diode.

In the figure, reference numeral 14 denotes a stop screw, 15 denotes a stopper clearance, 16 denotes a pressing / stopping washer that rotatably provides the tip of the handle 1 with respect to the neck handle 4, 17 denotes a cover, and 18 denotes a chino.

FIG. 6 shows a case where the present invention is applied to a spanner. In the drawing, reference numeral 19 denotes a pivot portion, and 2 denotes a pivot shaft. However, the application range of the present invention is not limited to the embodiment. Rather, it extends to various embodiments of ratchet wrench and pipe wrench.

〔The invention's effect〕

Since the present invention is configured as described above, it exhibits the following practicality.

The handle is not of a pipe structure, but can be said to be an integral type. The structural design of the end portion is free, and for example, it is also possible to integrally form a chino.

Many conventional products use only the screw tightening direction because of the torque-sensitive structure.However, the product of the present invention does not change the torque-sensitive value even when used for screw loosening work. It is a product that can not be determined.

Since it is not made of pipe, there is no need to worry about deformation when used violently, and it has sufficient durability as a forged ordinary tool.

A structure in which the tightening torque sensing mechanism is attached to the side of the handle parallel to the handle is adopted, so the length of the installation space and the degree of freedom of the width are large, so the parts can be enlarged accordingly, and there is little deterioration in accuracy. .

By turning the handle in the nut tightening direction, the transmission of the torque generated in the wrench cylinder is transmitted from the neck handle to the returning arm, and the direction is further reversed to be transmitted to the anti-shrinking strip. Since the mechanism is adopted, the pressing force (repulsive force) of the anti-shrinkable striation can be amplified by leverage principle by setting the position of the fulcrum and force point of the return arm, so the anti-shrinking striation can be downsized or the pressing force can be adjusted in a wide band It is also possible to design so that

Unlike a conventional product in which a tightening torque application mechanism is provided perpendicular to the handle, the tightening torque located on both sides of the handle and the protruding portion of the sensitive mechanism do not obstruct the work operation.

The tightening torque response mechanism is not a mechanism that is installed inside the pipe, but it is exposed so that even if mud, pebbles or sand enters, it can be easily washed off with water. Also, the maintenance and management of the user becomes easy.

The return arm is exposed, and the rotation of the return arm is visually recognized to confirm that the regulation torque has been reached. It is a torque-sensitive rotary tool that can be easily stopped at the torque regulation value and has excellent practicality that can avoid tightening due to overtorque.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a front view of the present invention, FIG. 2 is a partially cutaway side view, and FIG.
FIG. 4 is a cross-sectional view taken along the line BB, FIG. 5 is a partially cutaway front view showing the state where the regulation torque has been reached, FIG.
The figure is a front view of a part of the spanner. 1 ... handle, 2 ... return arm, 2 '... tip, 2 "...
Front side surface, 3 ... Anti-shrinkable strip, 4 ... Neck pattern, 4 '... End face, 5 ... Main body, 6 ... Wrench cylinder, 7 ... Nut, 13
…… Support part, a …… Tightening torque sensitive mechanism.

Claims (1)

(57) [Claims] A tip of a rotating handle is superposed on a neck handle connected to a main body, and the handle is rotatably connected to the neck handle. Place the returning arm in a crossed state with the handle, on the way, project the tip of this returning arm to the side of the handle, attach the base to the handle, and turn the tip of the returning arm into the handle. The front side surface of the base of this return arm abuts on the end surface of the neck handle, and between the distal end of the return arm and the support portion protruding forward of the handle. By attaching an anti-shrinkable strip parallel to the side of the handle and turning the handle in the nut tightening direction,
Transmission of torque generated in the wrench cylinder is transmitted from the neck handle to the return arm, and a U-turn transmission type tightening torque sensing mechanism that reverses the direction and is transmitted to the anti-shrinkage strip is provided. With this tightening torque sensing mechanism, A torque-sensitive rotary tool, wherein the return arm is provided in an exposed state so that the tightening force of the nut has reached a regulated torque at the rotation position of the return arm.