Fluid operated clutch and spring operated brake

Claim 1

Clutch and brake apparatus comprising annular casing means including hub means adapted to be non-rotatably mounted on a shaft and having an outer annular hub surface portion, and first and second end wall means radially projecting from the ends of said hub means, said first and second end wall means having confronting annular first and second friction surfaces, said first end wall means forming with said hub surface portion an annular cylinder chamber; annular piston means movable in said annular cylinder chamber; annular pressure means abutting said piston means, and having opposite annular first and second pressure faces confronting said first and second friction faces, respectively, spaced from the same; blocked non-rotatable annular first friction means and driven rotary annular second friction means located between the pair of first pressure and friction faces and the pair of second pressure and friction faces, respectively, and being axially movable by said annular pressure means; spring means urging said pressure means with said piston means to a first position holding said non-rotatable first friction means in frictional engagement with said first friction face of said first end wall means for braking said shaft, said piston means moving said pressure means to a second position holding said second friction means in frIctional engagement with said second friction face of said second end wall means when said cylinder chamber is filled with a pressure fluid whereby said shaft is rotated; and a plurality of circumferentially spaced axially extending bolt means connecting said first and second end wall means and passing through said cylinder chamber and through aligned openings in said piston means and said pressure means for guiding said piston means and pressure means for axial movement between said first and second position so that said shaft is either braked or driven.