SU721320A1 - Percussive nut wrench - Google Patents

Description

one

The invention relates to the field of mechanical engineering, and more specifically to wrenches for assembling threaded connections, and can be used as a hand tool.

Known wrench, comprising a housing and placed in it a drive with a spindle and a torque wrench. Threaded connections are tightened by a static torque wrench l.

A disadvantage of the known wrench is that simultaneously with the static moment a high frequency vibration is applied to the spindle.

The closest in technical essence to the invention is a percussion impact wrench, comprising a housing, an actuator housed therein, an impact mechanism with a spindle, and a handle elastically connected to the housing 2.

The disadvantage of this wrench is the low accuracy of the tightening torque and its misalignment from the thread parameters.

feoro connections, i.e. the moment developed by the wrench, is small.

The purpose of the invention is to increase the torque and accuracy of the fixture.

This is achieved in that the wrench is provided with a device for transmitting a static moment from the housing to the spindle.

In addition, the device for transmitting static torque is made in the form of an overrunning clutch, and the wrench itself is supplied. A device for indicating the angle of rotation of the housing relative to the handle.

FIG. 1 shows a wrench, general view; in fig. 2 is a view A of FIG. one; in fig. 3 is a section BB in FIG. 1.

five

The wrench includes a housing 1, a drive 2 located therein, a percussion mechanism 3, a spindle 4 and a handle 5 connected to the housing 1 by an elastic element 6, between the housing and the spindle

Claims (2)

0 yctanova device for transmitting the static moment from case i to spindle 4, made, for example, in a VNPR of clutch 7, a free holp, the holder 8 of which is clamped with the nut wrench, opposite to the free running of the coupling. On the case 1 of the wrench, a device 12 is fixed to indicate the angle of rotation of the case, which with its stem 13 abuts against the protrusion 14 of the handle 5. The percussion wrench operates as follows. When spindle 4 rotates under the deformation, periodic shocks created by the impact mechanism 3, balls 1O wedge overcoming the spring of the springs 11 and pass the spindle 4. The clutch 7 runs freely. After the impact, the bolt head tends to turn off if the torque of the bolt body is more than the moment friction under the head. The clutch 7 is wedged and does not allow for the return punch: Eni bolt head. In this case, the intensity of the resulting screwing process increases. Dp of conventional threaded connections is the ratio of the reactive torque on the wrench spindle to the tightening torque reached in the range of 0.005-0.001. And, therefore, the reactive torque is proportional to the achieved tightening torque. To this end, the spring loaded handle is connected to the nut case by means of a device 12 for indicating the angle of rotation of the handle relative to the housing defined by the reactive torque. The operator, keeping the handle still, monitors the increase in the readings of the device 12 to indicate the number of tightening of the threaded connection. When the specified value is reached, the puff stops. As is known, for each specific pair of wrench-threaded connection there is a maximum achievable tightening torque. With the further work of the impact wrench, the torque does not increase. After each stroke, the bolt head twists and then unscrews without causing a turn in the thread. By applying additional torque to the e-joint through the freewheel, the operator prevents the threaded connection from loosening and thereby increases the maximum tightening torque of the impact wrench. This embodiment of the impact wrench provides an increased tightening speed, an increase in the maximum attainable amount of tightening of the threaded joint. By controlling the torque achieved, the accuracy of tightening is increased and the productivity is increased by screwing in the responsible threaded connections. Claim 1. A percussion impact wrench comprising a housing, an actuator accommodated therein, a percussion mechanism with a spindle and a handle elastically connected to the housing, characterized in that, in order to improve the tightening torque and accuracy, from core to spindle. 2. A wrench according to claim 1, characterized in that the device for transmitting a static moment is made in the form of an overrunning clutch. 3. Wrench on RP. 1, 2, from ji that is equipped with a device for indicating the angle of rotation relative to the handle. Sources of information taken into account in the examination 1. US patent number 3521348, cl. 29-428, 1971. 2. The mechanized tool, from delochny cars and vibrators. Catalog reference book TsNIITEstroymash, 1975, p. 69 (prototype). VidL Fi2.3