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United States of America Patent
Stats
-
Mar 30, 1999
Grant Date -
N/A
app pub date -
May 7, 1997
filing date -
May 17, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A support rod (3) vertically movably inserted into a housing (2) is urged upward by an advancing spring (4). An annular piston (6) is inserted between a barrel portion (2c) of the housing (2) and an outer peripheral surface of the support rod (3). A collet (10) externally fitted onto a holding and fixing portion (C) of the support rod (3) is received by a lower end wall (2b) of the housing (2). A tapered transmission member (17) externally fitted onto the collet (10) is urged downward by a holding spring (22). The urging force clamps the support rod (3) at a predetermined height through the collet (10).
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