Brakes – Internal-resistance motion retarder – Cylinder structure
Reexamination Certificate
2006-03-21
2010-10-12
Schwartz, Christopher P (Department: 3657)
Brakes
Internal-resistance motion retarder
Cylinder structure
C029S505000
Reexamination Certificate
active
07810620
ABSTRACT:
In a monotube type hydraulic shock absorber, a plurality of rectangular recesses that are elongate in a circumferential direction are formed in an outer circumferential surface of a cylinder at a position in the vicinity of an upper limit of a slidable range of a free piston. A support for supporting an external part such as a sensor or a hose is positioned so as to be fitted around a portion of the cylinder at which the recesses are formed. Thereafter, while supporting the rear sides of the recesses by a moving die of a receiving member, a plurality of pairs of punches are moved towards each other, to thereby press flat press portions of the punches against the support, thus drawing the support locally into the recesses of the cylinder without forming projections in an inner surface of the cylinder.
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Hitachi , Ltd.
Schwartz Christopher P
Wenderoth , Lind & Ponack, L.L.P.
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