US3717072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake cylinder for vehicles
Assignee: Westinghouse Bremsen und Apparatebau GmbH
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Filing: 1970-12-21
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Granted: 1973-02-20
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Expires: 1990-12-21
Abstract
Abstract A brake cylinder device of the spring actuated and fluid pressure released type characterized by a compound piston having a smaller cylinder and piston nested within a cup-like central portion of a larger piston, all being disposed within an outer cylinder casing of dimensions equivalent to those of the cylinder casing of a conventional single-piston brake cylinder.
Inventors
- 👤 W Kaltenthaler
- 👤 H Mylius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:58
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/08; B60T17/085
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
204 words
A brake cylinder device comprising: a. an outer cylinder casing; b. a piston assemblage coaxially operably disposed in said outer cylinder casing; and c. spring means for exerting a first force on said piston assemblage for effecting axial movement thereof in one direction toward one position; d. said piston assemblage comprising a pair of pistons of respective different sizes mounted On a common piston rod in axially spaced-apart relationship and having respective pressure areas on corresponding sides thereof adjacent respective pressure chambers being chargeable with fluid pressure, the opposite sides of said pistons being disposed adjacent respective atmospheric chambers, said pressure areas being subjectable to fluid pressure in said chambers and being effective when such pressure exceeds a predetermined degree for cumulatively providing a combined force greater than said first force for effecting axial move-ment of the piston assemblage in a direction opposite to said one direction toward a different position, the larger of said pair of pistons being reciprocably operable within said outer cylinder casing and having a concentric cup-like portion in which an inner cylinder casing is concentrically accommodated in fixed relation to the outer cylinder casing, the smaller of said pair of pistons being reciprocably operable within said inner cylinder casing.
Claim 2
Dependent Claim
204 words
A brake cylinder device comprising: a. an outer cylinder casing; b. a piston assemblage coaxially operably disposed in said outer cylinder casing; and c. spring means for exerting a first force on said piston assemblage for effecting axial movement thereof in one direction toward one position; d. said piston assemblage comprising a pair of pistons of respective different sizes mounted On a common piston rod in axially spaced-apart relationship and having respective pressure areas on corresponding sides thereof adjacent respective pressure chambers being chargeable with fluid pressure, the opposite sides of said pistons being disposed adjacent respective atmospheric chambers, said pressure areas being subjectable to fluid pressure in said chambers and being effective when such pressure exceeds a predetermined degree for cumulatively providing a combined force greater than said first force for effecting axial move-ment of the piston assemblage in a direction opposite to said one direction toward a different position, the larger of said pair of pistons being reciprocably operable within said outer cylinder casing and having a concentric cup-like portion in which an inner cylinder casing is concentrically accommodated in fixed relation to the outer cylinder casing, the smaller of said pair of pistons being reciprocably operable within said inner cylinder casing.
Claim 3
Dependent Claim
204 words
A brake cylinder device comprising: a. an outer cylinder casing; b. a piston assemblage coaxially operably disposed in said outer cylinder casing; and c. spring means for exerting a first force on said piston assemblage for effecting axial movement thereof in one direction toward one position; d. said piston assemblage comprising a pair of pistons of respective different sizes mounted On a common piston rod in axially spaced-apart relationship and having respective pressure areas on corresponding sides thereof adjacent respective pressure chambers being chargeable with fluid pressure, the opposite sides of said pistons being disposed adjacent respective atmospheric chambers, said pressure areas being subjectable to fluid pressure in said chambers and being effective when such pressure exceeds a predetermined degree for cumulatively providing a combined force greater than said first force for effecting axial move-ment of the piston assemblage in a direction opposite to said one direction toward a different position, the larger of said pair of pistons being reciprocably operable within said outer cylinder casing and having a concentric cup-like portion in which an inner cylinder casing is concentrically accommodated in fixed relation to the outer cylinder casing, the smaller of said pair of pistons being reciprocably operable within said inner cylinder casing.
Claim 4
Dependent Claim
204 words
A brake cylinder device comprising: a. an outer cylinder casing; b. a piston assemblage coaxially operably disposed in said outer cylinder casing; and c. spring means for exerting a first force on said piston assemblage for effecting axial movement thereof in one direction toward one position; d. said piston assemblage comprising a pair of pistons of respective different sizes mounted On a common piston rod in axially spaced-apart relationship and having respective pressure areas on corresponding sides thereof adjacent respective pressure chambers being chargeable with fluid pressure, the opposite sides of said pistons being disposed adjacent respective atmospheric chambers, said pressure areas being subjectable to fluid pressure in said chambers and being effective when such pressure exceeds a predetermined degree for cumulatively providing a combined force greater than said first force for effecting axial move-ment of the piston assemblage in a direction opposite to said one direction toward a different position, the larger of said pair of pistons being reciprocably operable within said outer cylinder casing and having a concentric cup-like portion in which an inner cylinder casing is concentrically accommodated in fixed relation to the outer cylinder casing, the smaller of said pair of pistons being reciprocably operable within said inner cylinder casing.
Claim 5
Dependent Claim
59 words
A brake cylinder device, as set forth in claim 1, wherein said pressure chambers comprise an auxiliary pressure chamber formed in said inner cylinder casing and a main pressure chamber, the external diametral dimension of said inner cylinder casing being such relative to the internal diametral dimension of said cup-like portion as to form said main pressure chamber therebetween.
Claim 6
Dependent Claim
34 words
A brake cylinder device, as set forth in claim 2, further characterized by passage means interconnecting said pressure chambers and a common fluid pressure supply port via which said chambers may be charged simultaneously.
Claim 7
Dependent Claim
46 words
A brake cylinder device, as set forth in claim 1, wherein one end wall of the outer cylinder casing and one end wall of the inner cylinder casing lie in a common plane perpendicular to the axis of the brake cylinder device at one end thereof.
Claim 8
Dependent Claim
53 words
A brake cylinder device, as set forth in claim 1, further characterized by manually operable means for effecting axial movement of said piston rod and said smaller piston in a direction coinciding with said opposite direction of said piston assemblage and to a position coinciding with said different position of the piston assemblage.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |