PL128182B1 - Chuck for centering and chucking workpieces with through hole - Google Patents

Description

The subject of the invention is a holder for centering and accommodating workpieces with a through hole, for example sleeves, gear wheels, flanges (disc-type workpieces), processed on machine tools and aggregates.

Cylindrical cylindrical pins with a threaded tip and a nut clamp and with a slight taper / l: 200 / are known and commonly used for this purpose. Other more difficult solutions are: expansion sleeves mounted on a conical mandrel or diaphragm clamps with clamping mass. These holders have a limited use in the unit production of items with different dimensions of the holes due to the required number of pins and sleeves on the equipment and the costs of this equipment. The most versatile fixture for workpieces are three or four jaw self-centering chucks where centering and clamping cause the jaws to spread apart. These handles are complicated to manufacture and do not have an axial clamping force.

Also known are box-type devices with a clamp by means of a bayonet lock. They include a body, the walls of which are provided with fixed and movable parts for locating and clamping workpieces. For quick fixing of objects in these devices, a bayonet lock is used, which includes sleeves embedded in one of the body walls, in which a pin with a pressure collar is slidably mounted. The sleeve is provided with a helical groove for receiving a handle to be fitted in the thrust pin. The slight slope of the helix of the groove significantly reduces the lifting height of the clamp, and the clamp itself cannot be moved up or down. The bayonet clamp makes it impossible to fix objects with a significantly different height and diameter.

The aim of the invention is to develop a simple handle structure ensuring a large variety of dimensions of the objects to be clamped with axial force and the minimum time of clamping and unfastening the workpieces. 2 128 182 The essence of the solution consists in providing the clamping plate with a cylindrical recess with an internal thread, in which the bushing is mounted. having a radial perpendicular to the pin hole for the pin protruding inward. The protruding part of the pin is placed in one of a series of grooves located on the cylindrical surface of the shank extending transversely from the longitudinal groove for the purpose of simple and quick adjustment of the pressure plate in relation to the pin, thus increasing the scope of use of the holder for fixing objects of various heights and hole diameters. Greater versatility of the handle is obtained when having a set of several pressure plates with different external dimensions.

The subject of the invention is illustrated, for example, by the drawing, in which fig. 1 shows the handle in longitudinal section, and fig. 2 - a section of the developed cylindrical surface of the handle pin in a side view according to the arrow A in fig. 1. The handle consists of a plate 1 and a A pin 2, the axis of which is perpendicular to the plate. The mandrel has a longitudinal groove 7 on a cylindrical surface and a series of divergent groove branches 8, for a pin permanently mounted in the sleeve 5, connected by the thread of the sleeve flange and recesses 4 with pressure discs, and 3 axial holes on the mandrel 2. The sleeve 5 is mounted on the mandrel with play, and connecting it with a pin to the rocks 7 and 8 of the mandrel 2 allows a simple and quick way to move the discs 3 or the pin 2 in order to use the holder for fixing objects with different height and diameter of the hole. The thread connecting the sleeves 5 to the pressure plates 3 is used for quick clamping and unfastening the object in the holder. The small angle of rotation of the disc 3 by the actuation 9 of the actuation of the sleeve 5 is sufficient to force or release the clamping of the object in the holder. 2 patent attestation. Holder for centering and sleeping objects with a through hole, provided with a plate with an offset, a pin mounted in the plate and pressure plates slidably mounted on the pin, characterized by the fact that the pressure plate hub / 3 / for a cylindrical recess / 4 / with an internal thread, in which is rotatably mounted in relation to the mandrel / 2 / sleeve / 5 / having a radial, perpendicular to the axis of the mandrel, hole for the pin / S /, the end of which protruding towards the inside is placed in one of the series of grooves / C / extending on the cylindrical surface of the mandrel transversely from the longitudinal groove /! / for the purpose of quick displacement of the disc / 3 / from the sleeve / 5 / relative to the pin / 2 /.

Figi Pofenfkzna studio of the UP PRL. Mintage 100 cg *.

Price: PLN 100