Patent US3621952A successfully refreshed from Google Patents.
US3621952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring loaded piston rod seal
Assignee: Motors Liquidation Co
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Filing: 1969-11-05
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Granted: 1971-11-23
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Expires: 1989-11-05
Abstract
Abstract In preferred form, a hydraulic shock absorber piston rod seal of resilient material having an annular collar portion supporting the seal and having radially inwardly projecting end portions on opposite sides of the collar portion which contact the piston rod. One end portion extends axially outward from the shock absorber to prevent the entry of dirt between the piston rod and the seal. The second end portion has a V-shaped cross section adapted to contact the piston rod at a pointed edge to prevent the escape of hydraulic fluid between the piston rod and the seal. An annular garter spring encircles the second end portion to bias the pointed edge of the V-shaped second end portion against the piston rod.
Inventors
- 👤 Paul J Long Jr
- 👤 Joseph P Pendergast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:44
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/36; F16F9/362; F16F9/364; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3232
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
330 words
A direct acting hydraulic shock absorber comprising: a pressure cylinder tube; valved piston means concentrically supported within said pressure cylinder tube for the regulation of hydraulic fluid flow therethrough; a reservoir tube concentrically surrounding said pressure cylinder tube and forming a hydraulic fluid reservoir chamber therebetween; a piston rod attached to said piston means for reciprocation in said pressure cylinder tube; said piston rod extending axially outward from said pressure cylinder tube; a piston rod guide within one end of said pressure cylinder tube and around said piston rod for positioning said piston rod concentrically within said pressure cylinder tube; a cup-shaped end member connected at its periphery to said reservoir tube and having a central bore through which said piston rod extends; an annular piston rod seal assembly encircling said piston rod to prevent leakage of hydraulic fluid therebetween; said piston rod seal assembly having a radially outwardly extending colLar portion supported between said piston rod guide and said end member; a radially inwardly tapered end portion on one side of said collar portion which extends axially outward from said shock absorber to contact said piston rod for blocking the entry of foreign material between said seal and said piston rod; a radially inwardly projecting lip portion on a second side of said collar portion extending axially inward with respect to said shock absorber; a rigid washer with a central bore encircling said lip portion and adjacent said second side of said collar portion; a coil spring around the outer periphery of said lip portion with its ends joined to form an annular compression means to bias said lip portion against said piston rod; said annular coil spring having a greater diameter than said central bore of said washer and thus being spaced radially outwardly from said inner periphery of said washer which prevents axial movement of said lip portion outward from said shock absorber and retains said washer around said lip portion during assembly of said shock absorber.
Claim 2
Dependent Claim
330 words
A direct acting hydraulic shock absorber comprising: a pressure cylinder tube; valved piston means concentrically supported within said pressure cylinder tube for the regulation of hydraulic fluid flow therethrough; a reservoir tube concentrically surrounding said pressure cylinder tube and forming a hydraulic fluid reservoir chamber therebetween; a piston rod attached to said piston means for reciprocation in said pressure cylinder tube; said piston rod extending axially outward from said pressure cylinder tube; a piston rod guide within one end of said pressure cylinder tube and around said piston rod for positioning said piston rod concentrically within said pressure cylinder tube; a cup-shaped end member connected at its periphery to said reservoir tube and having a central bore through which said piston rod extends; an annular piston rod seal assembly encircling said piston rod to prevent leakage of hydraulic fluid therebetween; said piston rod seal assembly having a radially outwardly extending colLar portion supported between said piston rod guide and said end member; a radially inwardly tapered end portion on one side of said collar portion which extends axially outward from said shock absorber to contact said piston rod for blocking the entry of foreign material between said seal and said piston rod; a radially inwardly projecting lip portion on a second side of said collar portion extending axially inward with respect to said shock absorber; a rigid washer with a central bore encircling said lip portion and adjacent said second side of said collar portion; a coil spring around the outer periphery of said lip portion with its ends joined to form an annular compression means to bias said lip portion against said piston rod; said annular coil spring having a greater diameter than said central bore of said washer and thus being spaced radially outwardly from said inner periphery of said washer which prevents axial movement of said lip portion outward from said shock absorber and retains said washer around said lip portion during assembly of said shock absorber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |