Brakes – Internal-resistance motion retarder – Resistance alters relative to direction of thrust member
Reexamination Certificate
2007-11-13
2007-11-13
Siconolfi, Robert A. (Department: 3683)
Brakes
Internal-resistance motion retarder
Resistance alters relative to direction of thrust member
C188S322220
Reexamination Certificate
active
10520351
ABSTRACT:
A hydraulic shock absorber comprises a cylindrical chamber (3), which is closed at one end and in which is axially slidably guided a piston member85), supported by a piston rod (8) and at its peripheral surface carrying a surrounding non-slotted elastic ring element (6), the peripheral piston member surface being conically converging in a direction away from the closed chamber end and the inner surface of the ring element also conically converging in the same direction, the ring element (6) furthermore being axially reciprocably mounted on the piston member (5) between a first rigid abutment84) at the end of said member (5) closest to the closed and (10) of the chamber (3), and a second rigid abutment (7) on the piston member (5) at a spacing from the first abutment (4) exceeding the axial length of the ring element (6). In order to increase the speed of response of the absorber the invention suggests that the two conical surfaces have mutually different conicity with core angles and diameters such selected that in an outward return movement of the piston member (5) the same is urged with its steeper conical peripheral surface against the less conical inner surface of the surrounding ring element (6) and brings the first abutment (4) into engagement with yieldable ring element (6) while—at the same time—radially expanding the same so as to leave only a small intentional clearance for letting through hydraulic fluid between the outer surface of the ring element (6) and the inner surface of the cylinder.
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ASA-Suspension AB
Dickstein & Shapiro LLP
Nguyen Vu Q.
Siconolfi Robert A.
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