Brakes – Internal-resistance motion retarder – With means for locking parts together temporarily
Reexamination Certificate
2008-07-22
2011-11-01
Rodriguez, Pamela (Department: 3657)
Brakes
Internal-resistance motion retarder
With means for locking parts together temporarily
C188S322190, C267S220000
Reexamination Certificate
active
08047341
ABSTRACT:
A hydraulic shock absorber enables its piston rod to be locked near its minimum length position and allows the locked condition to be visually confirmed easily. A cap member is secured to a distal end portion of a piston rod extending from a cylinder part, and a dust cover is secured to the cap member. A lock member is secured to an end of the cylinder part from which the piston rod extends to the outside. The lock member is cut and bent upward to form engaging portions. The cap member is cut and bent downward to form engaging pieces and windows. With the piston rod contracted to near its minimum length position, the cap member is rotated to engage the engaging portions and the engaging pieces with each other, thereby locking the piston rod. The engaged condition of the engaging portions and the engaging pieces can be visually confirmed through the windows.
REFERENCES:
patent: 3938793 (1976-02-01), Kaptanis et al.
patent: 4427188 (1984-01-01), Shimokura et al.
patent: 37-4217 (1962-03-01), None
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patent: 58-12744 (1981-07-01), None
patent: 58-020740 (1983-02-01), None
patent: 2-132147 (1990-11-01), None
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European Search Report issued Sep. 3, 2009 in corresponding European Patent Application No. 08 01 2734.
Chinese Office Action issued Mar. 3, 2011 in corresponding Chinese Patent Application No. 200810144884.2.
Japanese Office Action (with partial English translation) mailed Jun. 15, 2011 in corresponding Japanese Patent Application No. 2007-199658.
Maegawa Yusuke
Yamamoto Satsuki
Yoshida Tetsuo
Hitachi , Ltd.
Rodriguez Pamela
Wenderoth , Lind & Ponack, L.L.P.
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