Hollow rotary clamping apparatus

Chucks or sockets – With fluid-pressure actuator – Socket type

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Details

B23B 3100

Patent

active

044226543

ABSTRACT:
A fluidically operable hollow rotary clamping apparatus such as for use in lathes, has a housing wall and a piston portion located therein with the surface thereof together with the seal packing secured to the housing wall form a double-acting cylinder. This double-acting cylinder is impacted via two pressure medium inlets. A flange secured to the housing wall and the piston portion which is displaceable in only longitudinal direction, each support a group of ball bearings in which a rotary part is mounted. This rotary part contains symmetrically arranged gearwheels of a racked-bar differential drive, whereby the outer pair of gearwheels acts on a pair of racked bars on a guide tube and the inner gearwheel having a larger or smaller diameter and a greater or lesser number of teeth acts through slots in the guide tube on a racked bar on the actuation tube. The actuation tube is in operational engagement with a collet or the like.
Such a clamping or tensioning apparatus has a better degree of efficiency than the known device, is heated in use to a lesser degree and has a small rate of leakage and may be operated by the standard machine hydraulics or pneumatics due to considerable power transmission.

REFERENCES:
patent: 2515183 (1950-07-01), Benjamin et al.
patent: 2782044 (1957-02-01), Gabriel et al.
patent: 2886007 (1959-05-01), Manchester
patent: 2958533 (1960-11-01), Benjamin et al.
patent: 3372951 (1968-03-01), McCash
patent: 3439925 (1969-04-01), Sampson
patent: 3680435 (1972-08-01), Deplante
patent: 3689087 (1972-09-01), Flett

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