Transmission device for a clamp
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United States of America Patent
Stats
-
Jul 27, 1999
Grant Date -
N/A
app pub date -
Jul 20, 1998
filing date -
Jul 23, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A clamp rod has an outer peripheral surface provided with a first concaved passage communicated in entirety of the outer peripheral surface and in the shape of sawtooth. The first concaved passage comprises first spiral grooves in the shape of a multi-start thread and communication grooves. A sleeve externally fitted onto the clamp rod has an inner peripheral surface provided with a second concaved passage corresponding to the first concaved passage. A number of rolling balls are charged between the first concaved passage and the second concaved passage. The clamp rod and the sleeve are moved in a direction of an axis relatively to each other, thereby rotating the clamp rod around the axis.
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