SU20923A1 - Chuck for threading dies - Google Patents

Description

The invention relates to a cartridge for threading, provided with dies, which open up when the threaded screw is exposed to the stop and a system of levers that release the springs acting on the dies. The case of the proposed cartridge consists of two parts detachable along the axis of the cartridge, connected by means of guide pins and compressed together with the dies fixed in them by the action of a lever on the eccentric protrusion of the upper part of the body.

In FIG. 1 is a perspective view of the cartridge with a partial cut; FIG. 2 is a side view in section; FIG. 3 is a top view of the cartridge with a partial cut; FIG. 4 is a front view of it.

Case 1 of the proposed cartridge consists of two parts 2 and 3, connected to each other by means of guide pins 4, fixed to part 2 of the case and entering into the through-holes of part 3. Case 1 is provided with 5 dies fixed in it by means of screws than the upper part 3 of the housing, together with the part of the die 6 fixed in it, is under the action of springs 7 inserted between parts 2, 4, 3. In the housing 1 there is a cylinder 8 equipped with pins 9, 10 that exclude the possibility of axial movement of the cylinder and turning it relative about the housing 1. The end of the cylinder 8, facing the dies b, is provided with a piston 11 freely located in the internal cavity 22 of the cylinder, which, in turn, is provided with an internal cavity and fixed in it by means of a screw 12, a rod 13 with an emphasis 14 on the exit 11 piston end of the piston. The piston 11 is provided with two fingers 15 located in the longitudinal slots 16 of the cylinder 8 and the housing 1, wherein the ends of the fingers leaving the housing are in contact with the ends of the levers 17 fixed on the axis 18, 1 held by the uprights 19 of the housing 1. Axis 18, in addition to the levers 17, fixed at its ends, provided with levers 20 acting on the eccentric protrusions 21 of the part 3 of the housing 1.

When using a chuck, parts 2, 4, 3 of the body, together with the dies 6 held by them against the action of the springs 7, are compressed by pressing the levers 20 on the projections 21 of the body by rotating the levers 17, the end of the cylinder 8 coming out of the body is fixed in the head of the turret lathe, and the machine is driven. At the moment of contact of the screw that is being cut with the plates b with the stop 14, the piston 11 receives axial movement, the Yalians 15, who act on the levers 17 that are in contact with them, are carried away in their movement. As a result of the fingers 15 on the levers 17, the axis 18 and the ends of the levers 20 turn, the descent from the projections 21 of the housing release the compressed springs 7, under the action of which the parts 2, 3 of the housing are diverted by opening the plates. In order to connect the dies at the required moment, the rod 13 is pre-installed in the piston 11 so that the spacing from the stop 14

to the plates b corresponded to the length of the thread made on the screw.

The subject of the patent.

Chuck for threading dies, self-expanding by means of springs from the impact of cutting screws on the stop and a system of levers, characterized by the use of housing 1 and two, fitted with guide pins 4 and dies 6, parts 2 and 3, touching the axis of the cartridge and compressed by pressing one of the levers on the eccentric protrusion of the housing 21.

fdd