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
2008-07-29
2008-07-29
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
07404776
ABSTRACT:
A check valve unit in a hydraulic tensioner comprises a check ball which controls the flow of the oil to and from a high pressure oil chamber formed by a plunger and the plunger-receiving hole of the tensioner housing, a ball guide in which the check ball moves, a retainer which seals the check ball in the ball guide, and a ball seat which blocks reverse flow of oil by seating the check ball. Grooves, which ventilate air from the high pressure oil chamber to an oil supply passage, are formed on an outer circumferential surface of the ball guide and a bottom surface of the ball seat.
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Osamu Yoshida, inventor; patent application Hydraulic Tensioner; U.S. Appl. No. 11/039,661, filed Jan. 19, 2005.
Howson & Howson LLP
Johnson Vicky A
Tsubakimoto Chain Co.
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