Patent US3664236A successfully refreshed from Google Patents.
US3664236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance locking cylinder
Assignee: Individual
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Filing: 1970-02-13
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Granted: 1972-05-23
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Expires: 1990-02-13
Abstract
Abstract This disclosure relates to a table with a variable shape surface and locking cylinder therefor wherein the table is comprised of a plurality of vertically disposed resistance locking cylinders, each of which has a piston rod, the upper portion of which forms a portion of the variable shape surface. The piston rod is locked in place by a plurality of wedging members within the cylinder, the wedging members being forced against the piston rod when the piston rod encounters substantial resistance as it is extended.
Inventors
- 👤 Richard C Malott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:49
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/02; B23Q3/10; B23Q3/106; B23Q3/108; F; F15; F15B; F15B15/00; F15B15/20; F15B15/26; F15B15/262
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
183 words
A resistance locking cylinder having: an annular body; closure means closing each end of said cylinder to form a chamber within said body; fluid inlet ports at each end of said chamber; a piston axially slidable within said chamber; a piston rod fixed to said piston and extending through one of said closure means at one end of said chamber; a locking member between said one closure means and said piston, said locking member being axially slidable within said chamber and with respect to said piston and piston rod; wedging members carried by said locking member and engageable with said piston rod; means at said one end of said cylinder for forcing said wedging members into locking engagement with said piston rod when said locking member is forced up to said one end of said cylinder; and fluid passage means between one of said fluid inlet ports and each side of said locking member to permit movement of said locking piston into said one end of said chamber after said piston has moved to a point where it is restrained from further movement.
Claim 2
Dependent Claim
183 words
A resistance locking cylinder having: an annular body; closure means closing each end of said cylinder to form a chamber within said body; fluid inlet ports at each end of said chamber; a piston axially slidable within said chamber; a piston rod fixed to said piston and extending through one of said closure means at one end of said chamber; a locking member between said one closure means and said piston, said locking member being axially slidable within said chamber and with respect to said piston and piston rod; wedging members carried by said locking member and engageable with said piston rod; means at said one end of said cylinder for forcing said wedging members into locking engagement with said piston rod when said locking member is forced up to said one end of said cylinder; and fluid passage means between one of said fluid inlet ports and each side of said locking member to permit movement of said locking piston into said one end of said chamber after said piston has moved to a point where it is restrained from further movement.
Claim 3
Dependent Claim
22 words
A resistance locking cylinder according to claim 1 wherein said locking member is axially slidable on an upper portion of said piston.
Claim 4
Dependent Claim
22 words
A resistance locking cylinder according to claim 2 further comprising means forming a seal between said annular body and said locking member.
Claim 5
Dependent Claim
36 words
A resistance locking cylinder according to claim 1 wherein said wedging members extend axially and have inclined upper surfaces, and said wedging member forming means comprises an inwardly opening conical cavity in said one closure means.
Claim 6
Dependent Claim
20 words
A resistance locking cylinder according to claim 1 wherein said fluid passage means comprises a bleed hole through said piston.
References Cited (Backward Citations)
US1910121A
Cited
US2716965A
Cited
US2961837A
Cited
US2988058A
Cited
US3150563A
Cited
US3444783A
Cited
US3429233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |