JPS597005Y2 - Specified torque alarm driver - Google Patents

Description

[Detailed description of the invention] The present invention relates to a screwdriver that generates a specified torque alarm. Specifically, the specified torque for screw tightening can be adjusted according to the size of the screw, and accurate screw tightening torque can be easily obtained. This invention relates to a specified torque warning generating driver that can be attached to a driver.

In recent years, with the miniaturization and precision of equipment, particular importance must be placed on reliability. For this reason, it is necessary to assemble the screws with the correct torque, and it is necessary to confirm the specified torque.

Conventionally, a special torque screwdriver has been commercially available as a method for checking this type of screw tightening torque, and its structure is such that the screwdriver is equipped with a spring whose strength corresponds to the torque to be measured, and the driver is forced to apply a force exceeding the specified torque. If applied, the ratchet teeth become disengaged and slips, so that no force exceeding the specified torque is applied, or the screwdriver mentioned above has a scale plate with a torque scale displayed at the base of the handle to provide an intermediate torque for screw tightening. There are some things that make it possible to know.

However, in the case of the conventional torque screwdriver mentioned above, in the former case, it is necessary to prepare a screwdriver with a torque value corresponding to each torque, and it is extremely uneconomical to prepare many types of torque screwdrivers for many workers. In addition, the latter type of screwdriver with a torque scale has a tendency to be inefficient and inaccurate since it is necessary to check the scale and adjust the torque each time.

As described above, both of the above-mentioned methods have the problem that they are inefficient and uneconomical, and are not suitable for mass production.

The present invention was devised in view of the above problems, and its purpose is to provide a specified torque alarm generating driver that allows the torque value to be adjusted and allows the user to easily and accurately know the specified torque using a buzzer. It's about doing.

In order to achieve the above object, the present invention is characterized by having a hole formed by an elastic member on the center side of the cylindrical grip part into which a square driver handle is fitted and accommodated, and the outer diameter of the grip part is connected to the hole. a pressure valve that is connected to the air chamber and that is responsive to pressure data and that is connected to the air chamber at the top of the hole-shaped portion; and a switch that is operated in response to the pressure valve; It incorporates a warning buzzer and a battery, and uses pressure to detect changes in air chamber capacity that occur when the adapter rotates and the driver does not rotate.

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

Fig. 1 shows a sectional view of the specified torque alarm generation driver structure according to the present invention, and Fig. 2 is a plan view thereof. The adapter 2, which has a hole to be fitted and accommodated in the center of the grip part and has a built-in alarm device, is fitted so as to be fixed.

Because of the above-mentioned fit, the handle part 3 of the driver 1 is usually hexagonal, so when the adapter 2 is turned during screw tightening, the screwdriver 1 turns at the same time, and the torque applied to the adapter 2 is directly applied to the screwdriver 1 to tighten the screw. Can be done.

The adapter 2 is made of relatively hard rubber and deforms slightly when torque is applied, compressing the air chamber 4 provided inside, and causing the air 7L5 provided at the top of the air chamber 4 to flow through the air hole 5.
Press the valve 7 of the air valve 6 provided in the buzzer chamber 13 outside.

The shaft 8 of the valve 7 is made of an electrically conductive metal and is provided with a first contact 9 in contact with the shaft 8, and in front of the shaft 8 is provided with a second contact 11 adjustable in the direction of the arrow 10.

The second contact 11 is arranged to be adjusted according to the screw tightening torque.

When the force applied to the screwdriver is released, the shaft 8 of the valve 7
A spring 12 is attached to return the .

The first contact 9 and the second contact 11 of the buzzer chamber 13
A buzzer 14 and a battery 15 are provided between the two, and the first contact 9 is connected to the second contact 11 via the battery 15 and the buzzer 14.

The buzzer chamber 13 is made of an insulating material such as hard rubber or plastic, and has two to two holes 16 around it for producing a buzzer sound.
There will be 3 locations.

In the above structure, when torque is applied to the adapter 2 to which the screwdriver 1 is attached for screw tightening, pressurizing force acts on the air in the air chamber, and the air moves toward the air hole 5 in the direction of the arrow 17.
enters the air valve 6 from the air valve 6, pushes the valve 7, and connects the shaft 8 of the valve 7
The second contact 9 continues to be in contact with the second contact 11 .

This creates a circuit that connects the buzzer 14 and the battery 15, and the buzzer 14 issues an alarm to let you know that the specified torque has been reached.

When the force applied to the driver is released, the valve 7 releases the spring 12.
The contact is returned and the buzzer stops.

The second contact 11 is moved in the direction of the arrow 10 by the torque adjusting screw 18, and the distance of the contact is changed according to the torque to set the required torque value.

As explained above, the specified torque alarm generating screwdriver according to the present invention allows the screw tightening torque value to be adjusted, and the specified torque can be easily and accurately determined by the buzzer, and its practical effects are extremely large. It is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a specified torque warning generating driver according to the present invention, and FIG. 2 is a plan view thereof. In the diagram, 1...driver 2...
・Adapter, 3... Driver handle, 4...
...Air chamber, 5...Air hole, 6...
Air valve, 7...Valve, 8...Shaft, 9...
...First contact, 10...Arrow, 11...
...Second contact, 12...Spring, 1
3...Buzzer room, 14...Buzzer, 1
5... Battery, 16... Hole, 17...
... Air one-way arrow, 1B ... Indicates torque adjustment screw.

Claims (1)

[Scope of utility model registration request] The cylindrical grip has a hole formed by an elastic member on the center side to fit and accommodate the square driver handle, and has a sealed air chamber between the hole and the outside diameter of the grip. Furthermore, a pressure valve that communicates with the air chamber and operates in response to the pressure valve, a switch that operates in response to the pressure valve, an alarm buzzer, and a battery are incorporated in the upper part of the part that forms the hole. A specified torque alarm generating screwdriver characterized in that the change in air chamber capacity that occurs when the adapter rotates and the driver does not rotate is detected by pressure.