Tensioner having protrusion-preventing mechanism for a plunger

Details Tensioner having protrusion-preventing mechanism for a plunger Tensioner having protrusion-preventing mechanism for a plunger

2005-07-12

2005-07-12

Bucci, David A. (Department: 3682)

Endless belt power transmission systems or components

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

Load responsive tension adjuster or shifter

C474S110000, C474S111000

Reexamination Certificate

active

06916264

ABSTRACT:
In a tensioner for a timing belt or chain in an engine, a plunger, which is spring-biased in a protruding direction, is temporarily held in a retracted condition by a pivoted U-shaped or L-shaped wire spring. The spring has a locking portion engageable with a pin or groove on the plunger, and two arms having ends remote from the locking portion. The ends are pivoted to the housing on laterally displaced pivot axes. The lateral displacement of the pivot axes causes the wire spring to be under stress when its locking portion is engaged with the plunger, and the stress urges the locking portion toward a disengaged position. Thus, the plunger is held in its retracted condition during assembly by the locking portion of the wire spring, but is automatically released by disengagement of the locking portion from the plunger when the plunger is moved farther in the retracting direction.

REFERENCES:
patent: 5601505 (1997-02-01), Tada
patent: 5713809 (1998-02-01), Yamamoto et al.
patent: 6435992 (2002-08-01), Wakabayashi et al.
patent: 2003/0017893 (2003-01-01), Kaido et al.
patent: 2 356 911 (2001-06-01), None
patent: 58-38189 (1983-08-01), None
patent: 60-56847 (1985-04-01), None
patent: 7-317854 (1995-12-01), None
patent: 08-152051 (1996-06-01), None
patent: 11210844 (1999-08-01), None

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