US 4,537,410 AGranted

Arrangement for supplying a chuck with pressure fluid

AssigneeSMW Schneider & Weisshaupt GmbH

InventorKarl Hiestand

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Abstract

In a power operated chuck, a radially elastically deformable seal ring is inserted in a recess of a pressure fluid supply ring embracing the chuck body. The seal ring comprises a stiff body portion in which passages are provided for the pressure fluid, and laterally projecting fins which are elastically deformable in the radial direction of the chuck and apply against the supply ring. In an unloaded state, the seal ring is under slight bias applied against the supply ring and spaced from the circumferential surface of the chuck body. The area of the outer circumferential surface of the seal ring, exposed to the inflowing pressure fluid, is larger than the ring area on the inside circumference which is exposed to fluid pressure from the inside. The design makes it possible to transfer, in a short period of time, a large amount of pressure fluid into the chuck. Also, the seal ring disengages from the chuck body abruptly.

Claims16

Dependent claims

A pressure fluid supply arrangement, comprising:

a body member having a longitudinal axis, defining a pressure chamber and having an outer annular surface with a fluid passage communicating said outer surface with said pressure chamber;
a supply ring extending around said body member and defining an annular chamber communicating with said outer surface adjacent said fluid passage, and with a port for supplying pressure fluid to said annular chamber and through said fluid passage to said pressure chamber, said supply ring having an inner surface in said annular chamber spaced radially outwardly from said outer surface of said body member;
an annular seal ring disposed in said annular chamber and being elastically deformable for movement from said inner surface to said outer surface with supply of pressure fluid to said pressure chamber, with biasing means associated with said annular seal ring for biasing said seal ring in a direction toward said inner surface, said seal ring having a ring body portion with a substantially rectangular cross section and defining a ring passage for communication between said annular chamber and said fluid passage, said ring body portion having opposite substantially radial surfaces extending substantially perpendicular to said longitudinal axis of said body member, and a radially elastically deformable fin projecting from each of said radial surfaces.

Dependencies are inferred from the claim text.