Ratchet type tensioner

Details Ratchet type tensioner Ratchet type tensioner

2005-12-28

2008-12-23

Johnson, Vicky A (Department: 3682)

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Tension adjuster or shifter driven by electrical or fluid motor

Reexamination Certificate

active

07468012

ABSTRACT:
In a ratchet tensioner, a pawl, pivoted on a shaft in the tensioner housing, engages teeth on a plunger protruding from the housing to allow protruding movement of the plunger, while limiting retracting movement to a backlash distance. The pawl is biased into contact with the teeth on the plunger by a spring disposed in a hole in the housing and acting, through a piston slidable in the same hole, against a convexly curved surface of the pawl. The piston has a reduced portion in engagement with the pawl, which allows the pawl to be miniaturized without excessively reducing the radial dimensions of the portion of the pawl surrounding the pivot shaft.

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