Patent ID: 6311961
Filing Date: 2001-11-06
Classification: B60G,F16F

Abstract:
A suspension unit for connection between two relatively-movable parts in a combined resiliently and shock-absorbing relationship, said unit comprising:(a) a housing (11) defining a first chamber (17) therein and a housing (13) defining a second chamber (31) therein, at least one of said chamber housings being adapted for anchorage to a first one of said movable parts;(b) a first piston (15) slidably mounted in said first chamber and defining a first space (19) in said first chamber adjacent to said first piston for a substantially uncompressible fluid, said first piston including means (27) for anchoring said piston to the second of said movable parts in order to be driven by relative movement between said movable parts;(c) a second piston (29) slidably mounted in said second chamber and defining in said second chamber a second space (33) for the substantially uncompressible fluid adjacent to said second piston;(d) substantially continually open restricted passage means FIGS. 1-2: 39A, FIG. 3: 39B) for communicating fluid back and forth between said first and second spaces in response to sliding movement of said first piston in said first chamber, whereby movement between said first and second parts causes said uncompressible fluid to substantially immediately flow from one said space to the other said space through said passage means, thereby dampening movement between said movable parts, and further causing displacement of said second piston in said second chamber; and(e) resilient means (35) for biasing said second piston means in an intermediate placement in said second chamber generally corresponding to a normal placement of said first piston in said first chamber, whereby following said displacement of said second piston said resilient means urges said second piston back to its placement in said second chamber, thereby increasing pressure in said uncompressible fluid and urging said first piston back to said normal placement in said first chamber, for generally maintaining a predetermined distance between said movable parts.