SU766849A1 - Torque wrench - Google Patents

Description

(54) SIZE KEY

I

The invention relates to a hand tool for calibrated tightening of a threaded tool and can be used in any branch of mechanical engineering.

A device for limiting torque is known, in which the limiting mechanism is made in the form of discs, one part of which is connected with the key by the shaft, and the other part by the key with the case 1.

At the coolest moment, exceeding the limit, disc slippage occurs.

The drawback of the device is that it does not ensure the accuracy of tightening the threaded connection.

Closest to the invention is a limiting face wrench, comprising a cylindrical body with a handle, a replaceable working head and a limiting mechanism 2.

The disadvantage of such a key is that it does not provide uniformity and accuracy of tightening the threaded connection due to the past character of the work of the limiting mechanism.

The aim of the invention is to improve the accuracy of tightening the threaded connection and increase stability.

This goal is achieved by that the pre-separate mechanism is made in the form of a joint with a replaceable working shaft of the shaft with radial grooves installed in the grooves of the shaft of the cams interacting with the inner surface of the housing and balls interacting with the cams under the action of a package of disc springs with adjustable stiffness.

In addition, the housing is filled with a liquid lubricant.

FIG. 1 shows the key, general view; in fig. 2 shows section A-A in FIG. one.

The limit key contains case 1,

15 which, through the cams 2, is connected to the shaft 3, on the end of which the interchangeable head 4 is fastened, secured by a pin 5.

In the housing 1 placed package disc springs 6, through the finger 7 acting on 20 balls 8, which interact with the Cams 2, pressing them to the inner surface of the housing 1.

The tightening force (stiffness) of the springs is adjusted by screws 9, separated by shay

Claims (2)

Claim 1. Limit socket wrench containing a cylindrical body with a handle, a replaceable working head and a limit mechanism, characterized in that, in order to improve the accuracy of tightening the threaded connection, the limit mechanism is made in the form of a shaft connected with a replaceable working head with radial grooves installed in the grooves a shaft of cams interacting with the inner surface of the housing, and balls interacting with cams under the action of a packet of Belleville springs with adjustable stiffness. 2. The key is according to π. 1, characterized in that, 'in order to improve stability, the housing is filled with liquid lubricant.