US3557665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Braking cylinder for vehicles, especially automotive vehicles
Assignee: Robert Bosch GmbH
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Filing: 1969-06-24
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Granted: 1971-01-26
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Expires: 1989-06-24
Abstract
Abstract A braking arrangement for vehicles in which a braking piston with a piston rod is reciprocably arranged in a braking cylinder and defines with an end wall of the latter a working space into which pressure fluid may be fed to move the braking piston in a first direction for actuating a brake connected thereto, and in which an annular blocking piston which sealingly engages the inner cylindrical surface of the braking cylinder and the outer surface of the piston rod is arranged between said braking piston and the other endwall of the cylinder. The blocking piston defines in the interior of the cylinder a counterpressure space and moves relative to the braking piston upon feeding of pressure fluid into the counterpressure space. Clamping elements carried by the blocking piston are pressed, during initial feeding of pressure fluid into the counterpressure space and resulting movement of the blocking piston relative to the braking piston, against one of the aforementioned surfaces to thereby hold the blocking piston stationarily with respect to the one surface to cause upon further feeding of pressure fluid into the counterpressure space movement of the braking piston in a direction opposite to the first direction.
Inventors
- 👤 Alexander Von Lowis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:02
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/40; B60T8/4004; B60T8/4009; B60T17/00; B60T17/08; B60T17/10; B60T17/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
277 words
In a braking arrangement for vehicles, especially automotive vehicles, a combination comprising a braking cylinder having a peripheral wall having an inner cylindrical surface and a first and second transverse wall; a braking piston reciprocable in said braking cylinder and having a transverse wall and a piston rod having an outer cylindrical surface radially inwardly spaced from said inner cylindrical surface of said cylinder, said braking piston defining between its transverse wall and said first transverse wall of said cylinder a working space in the interior of said cylinder; means for connecting said braking piston to a brake of the vehicle; first passage means for feeding pressure fluid into said working space for moving said braking piston in one direction to actuate said brake; an annular blocking piston reciprocable in said cylinder and sealingly engaging said cylindrical surfaces and defining between the latter and one of the transverse walls a counterpressure space; second passage means for feeding pressure fluid into said counterpressure space for moving said blocking piston relative to said brake piston; and clamping means including clamping elements carried by said blocking piston and cooperating with the latter to translate axial movement of the blocking piston relative to said braking piston during initial feeding of pressure fluid into said counterpressure space into radial movement of said clamping elements to press the latter against one of said cylindrical surfaces with a frictional force which is greater than the axial force imparted to the blocking piston by feeding pressure fluid into said counterpressure space to thereby move, during further feeding of pressure fluid into said counterpressure space, said braking piston in a direction opposite to said one direction.
Claim 2
Dependent Claim
277 words
In a braking arrangement for vehicles, especially automotive vehicles, a combination comprising a braking cylinder having a peripheral wall having an inner cylindrical surface and a first and second transverse wall; a braking piston reciprocable in said braking cylinder and having a transverse wall and a piston rod having an outer cylindrical surface radially inwardly spaced from said inner cylindrical surface of said cylinder, said braking piston defining between its transverse wall and said first transverse wall of said cylinder a working space in the interior of said cylinder; means for connecting said braking piston to a brake of the vehicle; first passage means for feeding pressure fluid into said working space for moving said braking piston in one direction to actuate said brake; an annular blocking piston reciprocable in said cylinder and sealingly engaging said cylindrical surfaces and defining between the latter and one of the transverse walls a counterpressure space; second passage means for feeding pressure fluid into said counterpressure space for moving said blocking piston relative to said brake piston; and clamping means including clamping elements carried by said blocking piston and cooperating with the latter to translate axial movement of the blocking piston relative to said braking piston during initial feeding of pressure fluid into said counterpressure space into radial movement of said clamping elements to press the latter against one of said cylindrical surfaces with a frictional force which is greater than the axial force imparted to the blocking piston by feeding pressure fluid into said counterpressure space to thereby move, during further feeding of pressure fluid into said counterpressure space, said braking piston in a direction opposite to said one direction.
Claim 3
Dependent Claim
65 words
A combination as defined in claim 1, wherein said clamping means comprising a member fixed to said blocking piston and having a frustoconical surface, said clamping elements being located between said frustoconical surface and said one cylindrical surface to be pressed against the latter during movement of said blocking piston relative to said braking piston during initial feeding of pressure fluid into said counterpressure space.
Claim 4
Dependent Claim
78 words
A combination as defined in claim 2, wherein said frustoconical surface faces the inner surface of the peripheral wall of said braking cylinder and wherein said clamping elements are located between said frustoconical surface and said inner cylindrical surface, said working space being defined between said first transverse wall of said cylinder and said transverse wall of the braking piston and said counterpressure space being defined between said blocking piston and said transverse wall of said braking piston.
Claim 5
Dependent Claim
90 words
A combination as defined in claim 3, and including biasing means tending to move said clamping elements in axial direction along said frustoconical surface from a nonclamping position to a clamping position, and an annular projection on said braking piston cooperating with said clamping elements to hold the latter against the force of said biasing means in said nonclamping position when said braking piston is adjacent said first transverse wall of said cylinder and during movement of said braking piston in said one direction away from said first transverse wall.
Claim 6
Dependent Claim
28 words
A combination as defined in claim 4, including spring means cooperating with said blocking piston for biasing the latter towards said first transverse wall of said braking cylinder.
Claim 7
Dependent Claim
80 words
A combination as defined in claim 2, wherein said frustoconical surface faces said outer cylindrical surface of said piston rod and wherein said clamping elements are located between said frustoconical surface and said cylindrical surface of said braking cylinder, said working space being defined between said first transverse wall of said braking cylinder and said transverse wall of said braking piston and said counterpressure space being defined between said blocking piston and said second transverse wall of said braking cylinder.
Claim 8
Dependent Claim
78 words
A combination as defined in claim 6, and including biasing means tending to move said clamping elements in axial direction along said frustoconical surface from a nonclamping to a clamping position and an annular projection on said second transverse wall of said braking cylinder and cooperating with said clamping elements for maintaining the latter in said nonclamping position when said braking cylinder in an initial nonbraking position and during movement of said braking cylinder in said one direction.
Claim 9
Dependent Claim
41 words
A combination as defined in claim 7, and including a compression spring between said transverse wall of said braking piston and said blocking piston for urging said pistons respectively against said first and said second transverse wall of said braking cylinder.
Claim 10
Dependent Claim
21 words
A combination as defined in claim 2, and including friction-and brake-elements sandwiched between said clamping elements and said one cylindrical surface.
Claim 11
Dependent Claim
25 words
A combination as defined in claim 9, wherein said friction-and brake-elements form together a second frustoconical surface radially spaced and facing said first-mentioned frustoconical surface.
Claim 12
Dependent Claim
80 words
A combination as defined in claim 7, and including friction-and brake-elements sandwiched between said clamping elements and said outer cylindrical surface of said piston rod, said friction-and brake-elements forming together a second frustoconical surface radially inwardly spaced from and facing said first-mentioned frustoconical surface and tapering in a direction opposite to the taper of said first frustoconical surface, and biasing means cooperating with said friction- and brake-elements for biasing the latter towards said annular projection on said second transverse wall.
Claim 13
Dependent Claim
13 words
A combination as defined in claim 2, wherein said clamping elements are balls.
Claim 14
Dependent Claim
18 words
A combination as defined in claim 12, and including a noise-reducing ring of plastic material engaging said balls.
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |