Stepped cone draw block

Details Stepped cone draw block Stepped cone draw block

B - Operations, Transporting

21

C

205/35

B21C 1/12 (2006.01) B21C 1/14 (2006.01)

Patent

CA 1086684

STEPPED CONE DRAW BLOCK ABSTRACT OF THE DISCLOSURE A stepped cone draw block disclosed has intermediate sheaves which each include a pair of plate-like annular sheave members with peripheral flanges between which a ceramic ring for drawing a wire is clamped. Side surfaces of the sheave members of each intermediate sheave face away from each other along an axis of a shaft on which the draw block is mounted and axially facing surfaces of these sheave members are bolted in engagement with each other midway between the side surfaces. One sheave member of each intermediate sheave has a central opening sized to receive and mount the sheave on the shaft with a shaft key received within a keyway of the opening to provide coupling to the shaft, while the other sheave member has an opening slightly larger than the shaft and a groove aligned with but slightly larger than the keyway so as to facilitate mounting of the sheave. In one embodiment, the ceramic ring has a round inner surface with a semicircular slot which is aligned with a complementary semicircular slot of the sheave to receive a pin that prevents rotation therebetween. In ano- ther embodiment, the ceramic ring has an inner surface with a round portion and a flat portion that engage complementary sur- face portions on the sheave members to prevent relative rotation therebetween. Two of the smallest sheaves are formed by a unitary ceramic member with a central opening for receiving the shaft and a keyway formed by a polyurethane plug. A single sheave can alternately be used to replace the ceramic member and includes a pair of sheave members with a ceramic ring ad- hesively bonded therebetween. Another larger sheave also has a pair of sheave members with a ceramic ring adhesively bonded therebetween. The two largest sheaves of the draw block each have sheave members bolted to each other to clamp an associated ceramic ring between peripheral flanges thereof and the larger sheave is mounted on the smaller one to allow mounting on a shaft of a relatively short length.

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