SU1545110A1 - Torque wrench - Google Patents

Abstract

The invention relates to load measuring technique and can be used to control the tightening torque of threaded connections. The aim of the invention is to improve the accuracy and the expansion of the working range. When the thread is tightened, the torque on the drum 4 is converted without angular idling to the tension force of the band rod 6. When this force reaches the value of the pre-compression force of the cylindrical spring 7, the latter begins to compress, which causes the movement of the movable stop 9 and the tubular indicator 10 which can be observed through the groove 13 in the hollow handle 2. When the pointer 10 reaches the slider inserted into this groove, it means that the threaded joint has been tightened by the specified torque. 5 il.

Description

SP 'SP

fig 1

pre-compression of the cylindrical spring 7, the latter begins to compress, which leads to the movement of the movable stop 9 and the tubular pointer 10, which can be observed

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through the groove in the hollow handle 2. When the pointer 10 reaches the slider inserted into this groove, it means that the threaded connection is tightened by the specified torque. 5 il.

The invention relates to force-measuring techniques and can be used to control the tightening torque of threaded connections.

The aim of the invention is to improve the accuracy and the expansion of the working range.

Figure 1 shows the design of the moment key; figure 2 is a view of And figure 1; on fig.Z - section bb on

FIG. 1 in FIG. - section bb In Fig.21 in Fig.5 is a view of D in Fig.2,

The torque wrench includes a case 1 with a hollow handle 2 and a fork 3. bar – 0an C with a square hole 5 a tape bar 6 made in the form of a spiral spring, a cylindrical spring Ainu 7 compression, a threaded plug 8, a movable stop 9 with a tubular pointer 10, two flanges 11 and an elastic retainer 12. At the same time, the hollow handle 2 has a linear scale and a groove 13 into which a slider 14 is inserted, consisting of a washer, a nut and a screw.

The moment key works as follows |

Pre-torque key is set to the specified operating range. To do this, using a threaded plug 8, compress the cylindrical spring 7 between a movable stop 9 and a fixed stop made in the hollow handle 2, and fix the slider 14 in a predetermined amount.

position in the groove 13. In the unloaded condition of the torque wrench, the belt unit 6 is, due to its spring properties, wound on the drum 4. Then a replaceable head (not shown) is inserted into the square hole 5 of the drum 4, which is mounted on the tightened threaded joint

When the thread is tightened, the torque on the drum 4 without an angular idling is converted into a tension force of the band rod 6. When this force reaches the magnitude of the pre-compression force of the cylindrical spring 7, the latter begins to compress, which causes movement of the movable stop 9 and the tubular indicator 10 , which can be observed through the groove 13. Achievement by the pointer 10 of the slider 14 means that the threaded connection is twisted by a given torque.

Claims (1)

Invention Formula A torque wrench, comprising a housing with a hollow handle, a drum mounted rotatably in the housing, a tape pull mounted with the first end on the drum, a cylindrical spring mounted inside the hollow handle, a threaded plug screwed into the end of the hollow handle, a counting scale and a pointer, characterized in that, in order to increase the accuracy and expand the working range, a movable stop is inserted into it, mounted inside the hollow handle between the threaded plug and one end of the coil spring, which is made and in the form of a compression spring, the other end of which is pressed against a fixed stop made inside the hollow handle, on which a reference scale is placed, which is made linear, with the ribbon thread being made in the form of a helical spring and connected with a second end with a movable stop and pointer. Type A R Bb Fi.Z In turned