US3785253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radially yielding cylinder and piston arrangement
Assignee: Robert Bosch GmbH
•
Filing: 1972-01-14
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Granted: 1974-01-15
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Expires: 1992-01-14
Abstract
Abstract A piston structure, located in a cylinder to which pressure fluid can be supplied, includes a piston rod with a rigidly secured support piston on which a sealing piston, sliding in the cylinder, is mounted with radial play. The support piston is spaced from the cylinder surface and can move radially relative to the sealing piston and to the cylinder surface when the piston rod is radially displaced. Preferably, pressure areas balance the sealing piston in axial direction so that friction is reduced during relative radial movement between the support piston and the sealing piston due to radial displacement of the piston rod.
Inventors
- 👤 H Sandau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:03
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/10; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1447; F15B15/1452; F15B15/149; F16J15/00; F16J15/56
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
199 words
Radially yielding cylinder and piston arrangement, comprising a cylinder means having an inner surface; a piston rod; support piston means secured to said piston rod and located in said cylinder means, said support piston means including axially spaced disks having peripheral rims radially spaced from said inner surface; an annular sealing piston means surrounding with play the portion of said support piston means located between said disks and having lateral faces confronting said disks; plural sealing means between said lateral faces and said disks forming separate pressure areas, said sealing piston means having separate ducts connecting the pressure area adjacent each of said disks with the interior of said cylinder means adjacent the respective other disk so that said sealing piston means is balanced between said disks and relieved of axial pressure, said sealing piston means being spaced from said inner surface and having at least one peripheral recess; and annular sealing ring means in said recess having an outer surface in sliding contact with said inner surface so that said support piston means can radially move relative to said balanced sealing piston means and to said annular sealing ring means when said piston rod moves in radial direction.
Claim 2
Dependent Claim
199 words
Radially yielding cylinder and piston arrangement, comprising a cylinder means having an inner surface; a piston rod; support piston means secured to said piston rod and located in said cylinder means, said support piston means including axially spaced disks having peripheral rims radially spaced from said inner surface; an annular sealing piston means surrounding with play the portion of said support piston means located between said disks and having lateral faces confronting said disks; plural sealing means between said lateral faces and said disks forming separate pressure areas, said sealing piston means having separate ducts connecting the pressure area adjacent each of said disks with the interior of said cylinder means adjacent the respective other disk so that said sealing piston means is balanced between said disks and relieved of axial pressure, said sealing piston means being spaced from said inner surface and having at least one peripheral recess; and annular sealing ring means in said recess having an outer surface in sliding contact with said inner surface so that said support piston means can radially move relative to said balanced sealing piston means and to said annular sealing ring means when said piston rod moves in radial direction.
Claim 3
Dependent Claim
54 words
An arrangement as claimed in claim 1, wherein said sealing means between said lateral faces and said disks include two concentric sealing rings on each disk, forming annular pressure areas, each annular pressure area being connected by the respective duct with a peripheral portion of said sealing piston means spaced from said inner surface.
Claim 4
Dependent Claim
35 words
An arrangement as claimed in claim 1 wherein said support piston means includes sleeve means surrounding a piston rod portion between said two disks, and being surrounded by said sealing piston means with radial play.
Claim 5
Dependent Claim
63 words
An arrangement as claimed in claim 1 wherein said sealing piston means includes a sealing piston, a central guide ring surrounding said sealing piston and sliding on said inner surface, and two axially spaced yieldable sealinG rings on opposite sides of said guide ring sliding on said inner surface, and having sealing lips engaging said sealing piston means and said inner surface, respectively.
Claim 6
Dependent Claim
73 words
An arrangement as claimed in claim 1 wherein said piston rod has an annular shoulder and a threaded end portion, said support piston means mounting said sealing piston means and including sleeve means surrounding said piston rod, and nut means engaging said threaded end portion and pressing one of said disks against said shoulder so that said sleeve means and disks of said support piston means are rigidly secured to said piston means.
References Cited (Backward Citations)
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US1988726A
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US2068859A
Cited
US2460948A
Cited
US3207426A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |