Patent US4040339A successfully refreshed from Google Patents.
US4040339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axially adjustable clutch pistons
Assignee: BorgWarner Inc
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Filing: 1976-04-07
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Granted: 1977-08-09
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Expires: 1996-04-07
Abstract
Abstract A piston for a fluid actuator being formed of two annular sheet metal members having axially and radially extending portions whereby when said piston transmits force, a box-like sheet metal structure is formed.
Inventors
- 👤 John Saxon Ivey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:04
CPC Classifications
F; F16; F16J; F16J10/00; F16J10/02; F16D; F16D25/00; F16D25/06; F16D25/062; F16D25/063; F16D25/0635; F16D25/0638
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
A piston assembly for use in a fluid actuator, wherein the assembly is mounted in a bore and moves in response to fluid pressure applied thereto, comprising a first annular sheet metal piston member having a portion thereof extending radially inward from an outer axially extending portion, a second annular piston member having a section thereof extending radially outward from an inner axially extending portion thereof, the respective axially extending portions of the other member when said assembly is subjected to fluid pressure whereby a relatively strong box-shaped construction is defined during operation of the piston and, the axially extending portions of said first and second piston members having ends thereof remote from the radially extending portions thereof and said ends have a series of scallops or serrations formed thereon wherein the length of the axially extending portions of said first and second piston members is controlled by a coining operation on said scalloped portions.
Claim 2
Dependent Claim
155 words
A piston assembly for use in a fluid actuator, wherein the assembly is mounted in a bore and moves in response to fluid pressure applied thereto, comprising a first annular sheet metal piston member having a portion thereof extending radially inward from an outer axially extending portion, a second annular piston member having a section thereof extending radially outward from an inner axially extending portion thereof, the respective axially extending portions of the other member when said assembly is subjected to fluid pressure whereby a relatively strong box-shaped construction is defined during operation of the piston and, the axially extending portions of said first and second piston members having ends thereof remote from the radially extending portions thereof and said ends have a series of scallops or serrations formed thereon wherein the length of the axially extending portions of said first and second piston members is controlled by a coining operation on said scalloped portions.
Claim 3
Dependent Claim
171 words
A piston assembly for use in a fluid actuator, wherein the assembly is mounted in a bore and moves in response to fluid pressure applied thereto, comprising a first annular sheet metal piston member having a portion thereof extending radially inward from an outer axially extending portion, a second annular piston member having a section thereof extending radially outward from an inner axially extending portion thereof, the respective axially extending portions of each member being in engagement with the radially extending portions of the other member when said assembly is subjected to fluid pressure to define a relatively strong box-shaped construction of the piston assembly, wherein said second piston member has an inner radial extension adapted to engage said radially extending portion of said first piston, the effective length of said axially extending portion of said second piston being variable by varying the angular displacement between the radially extending portions and the axially extending portion of said second piston member whereby the axial dimension of said piston assembly may be controlled.
Claim 4
Dependent Claim
171 words
A piston assembly for use in a fluid actuator, wherein the assembly is mounted in a bore and moves in response to fluid pressure applied thereto, comprising a first annular sheet metal piston member having a portion thereof extending radially inward from an outer axially extending portion, a second annular piston member having a section thereof extending radially outward from an inner axially extending portion thereof, the respective axially extending portions of each member being in engagement with the radially extending portions of the other member when said assembly is subjected to fluid pressure to define a relatively strong box-shaped construction of the piston assembly, wherein said second piston member has an inner radial extension adapted to engage said radially extending portion of said first piston, the effective length of said axially extending portion of said second piston being variable by varying the angular displacement between the radially extending portions and the axially extending portion of said second piston member whereby the axial dimension of said piston assembly may be controlled.
References Cited (Backward Citations)
US2351554A
Cited
US3848518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |