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US4593606A
Expired / Lapsed
US
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Gear positioning cylinder
Assignee: Wabco Fahrzeugbremsen GmbH
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Filing: 1984-12-13
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Granted: 1986-06-10
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Expires: 2004-12-13
Abstract
Abstract A gear positioning cylinder having forward, reverse, and neutral gear selection provided by a positioning rod attached to a main piston in which an auxiliary piston is telescopically arranged for compactness.
Inventors
- 👤 Alfred Klatt
- 👤 Karlheinz Brinkmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:02
CPC Classifications
F; F16; F16H; F16H63/00; F16H63/02; F16H63/30; F16H63/3023; F15; F15B; F15B11/00; F15B11/08; F15B11/12; F15B11/121; F15B11/123; F15B15/00; F15B15/08; F15B15/14; F15B15/1409; F15B15/1423; F15B15/1466; F16H61/00; F16H61/26; F16H61/28; F16H61/30; F16H2061/307
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
288 words
A gear positioning cylinder comprising: (a) a housing; (b) an operating cylinder formed within said housing; (c) a main piston operably disposed in said operating cylinder and cooperating therewith to form first and second pressure chambers on opposite sides the reof subject to the supply and release of fluid under pressure; (d) a positioning rod fixed to one side of said main piston and projecting through said first chamber and through said housing to establish first and second positions and a third position intermediate said first and second positions; (e) an auxiliary cylinder formed by an annular wall projecting from the other side of said main piston into the said second chamber, said auxilisay cylinder being open at the projecting end thereof and closed at the opposite end by said main piston within the areas of said annular wall, said closed end of said auxiliary cylinder providing a first stop; (f) a closure member at said projecting end providing a second stop; (g) an auxiliary piston operably disposed in said auxiliary cylinder for movement between said first and second stops, said auxiliary piston having a central portion projecting from one side thereof through an opening in said closure member when said auxiliary piston is in engagement with said second stop; and (h) said housing providing a third stop with which said projecting central portion of said auxiliary piston is engageable, said positioning rod being in said first position when said auxiliary piston is in engagement with said first and third stops, in said second position when said auxiliary piston is disengaged from said third stop and engaged with said second stop, and in said middle position when said auxiliary piston is engaged with said second and third stops.
Claim 2
Dependent Claim
288 words
A gear positioning cylinder comprising: (a) a housing; (b) an operating cylinder formed within said housing; (c) a main piston operably disposed in said operating cylinder and cooperating therewith to form first and second pressure chambers on opposite sides the reof subject to the supply and release of fluid under pressure; (d) a positioning rod fixed to one side of said main piston and projecting through said first chamber and through said housing to establish first and second positions and a third position intermediate said first and second positions; (e) an auxiliary cylinder formed by an annular wall projecting from the other side of said main piston into the said second chamber, said auxilisay cylinder being open at the projecting end thereof and closed at the opposite end by said main piston within the areas of said annular wall, said closed end of said auxiliary cylinder providing a first stop; (f) a closure member at said projecting end providing a second stop; (g) an auxiliary piston operably disposed in said auxiliary cylinder for movement between said first and second stops, said auxiliary piston having a central portion projecting from one side thereof through an opening in said closure member when said auxiliary piston is in engagement with said second stop; and (h) said housing providing a third stop with which said projecting central portion of said auxiliary piston is engageable, said positioning rod being in said first position when said auxiliary piston is in engagement with said first and third stops, in said second position when said auxiliary piston is disengaged from said third stop and engaged with said second stop, and in said middle position when said auxiliary piston is engaged with said second and third stops.
Claim 3
Dependent Claim
95 words
A gear positioning cylinder as recited in claim 1, wherein a side opposite piston cooperates with said operating cylinder to form first and second pressure chambers on said one and said other sides thereof, said one side of said auxiliary piston cooperates with said auxiliary cylinder at said closed end thereof to form a third fluid pressure chamber, said positioning rod being located in said first position in response to the suply of fluid to said first chamber at a certain chosen value and the release of fluid pressure from said second and third chambers.
Claim 4
Dependent Claim
129 words
A gear positioning cylinder as recited in claim 2, further comprising: (a) said auxiliary piston having equal effective pressure areas on said one and said opposite sides; (b) a fluid pressure supply tube in said housing at said third stop, said tube extending through an opening in said auxiliary piston and terminating in said third chamber such that a differential pressure area is established between said auxiliary and main pistons subject to the fluid pressure of said third chamber; and (c) said positioning rod being movable to said second position in response to the supply of fluid to said second chamber at said certain chosen value, the release of fluid pressure from said first pressure chamber, and the supply of fluid to said third chamber at a variable pressure.
Claim 5
Dependent Claim
53 words
A gear positioning cylinder as recited in claim 2, wherein said positioning rod is located in said middle position in response to the supply of fluid to said third chamber at said certain chosen pressure and the reduction of fluid in said first chamber to a value less than said certain chosen pressure.
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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |