Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1980-12-10
1983-03-29
Crane, Daniel C.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
291495PM, 251359, 251368, 277DIG6, 419 10, 419 29, B23P 1500, B22F 102
Patent
active
043778925
ABSTRACT:
A sintered metal body, having an annular form suitable for use as a valve seat or seal, is impregnated with an uncured polymeric material such as PTFE which is then cured to partially fill the interparticulate spaces in the sintered metal body. The impregnated body is then subjected to applied pressure which preserves the annular shape of the body while collapsing substantially all voids throughout the body to cause the cured polymeric material within the sintered metal body to completely fill the collapsed interparticulate spaces thereby to render the body nonporous throughout.Inasmuch as the interparticulate spaces are completely filled with cured polymeric material, any increases in temperature of the body which result in an expansion of the polymeric material cause a migration of portions of that material from the interior of the body to the exterior surfaces of the body to lubricate the exterior surfaces. The body may, in addition, be completely covered by another layer of cured polymeric material to give the seat additional initial lubricity.
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Crane Daniel C.
Worcester Controls Corp.
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