US4478387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve construction
Assignee: ITT Inc
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Filing: 1981-10-22
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Granted: 1984-10-23
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Expires: 2001-10-22
Abstract
Abstract A series of hydraulic shock absorbers all using the same piston. This is attained by giving no damping function to the liquid passages in the pistons, by which all pistons can be provided with an equal number of passages with a fixed, relative large cross-section. Thus, all pistons are equal. The damping function is taken over by an annular damping member between the piston and the valve.
Inventors
- 👤 Pieter M. Postema
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:41
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/34; F16F9/348; F16F9/3484; F16K; F16K47/00; F16K47/08; F16K47/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A valve construction for use in a hydraulic shock absorber including a piston provided with liquid passages debouching on a seat face and a valve operatively coupled to close the liquid passages, comprising two annular damping members arranged between the piston and the valve, each damping member being provided with a plurality of damping passages extending parallel to the axis of the valve construction, wherein the damping passages in the damping members are slot shaped, said slots extending over a part of a concentric circle, whereby adjustment of the damping characteristic occurs by relative rotation of both damping members and wherein each damping member is provided with an axially projecting cam co-extensive with its radially facing outer peripheral edge which engages a corresponding selected one of a plurality of recesses provided along the radially facing outer peripheral edge of the other damping member.
Claim 2
Dependent Claim
143 words
A valve construction for use in a hydraulic shock absorber including a piston provided with liquid passages debouching on a seat face and a valve operatively coupled to close the liquid passages, comprising two annular damping members arranged between the piston and the valve, each damping member being provided with a plurality of damping passages extending parallel to the axis of the valve construction, wherein the damping passages in the damping members are slot shaped, said slots extending over a part of a concentric circle, whereby adjustment of the damping characteristic occurs by relative rotation of both damping members and wherein each damping member is provided with an axially projecting cam co-extensive with its radially facing outer peripheral edge which engages a corresponding selected one of a plurality of recesses provided along the radially facing outer peripheral edge of the other damping member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |