US3730058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylinder and piston unit
Assignee: Robert Bosch GmbH
•
Filing: 1971-05-11
•
Granted: 1973-05-01
•
Expires: 1991-05-11
Abstract
Abstract A piston is guided for movement in a cylinder and has a piston rod which is coupled with the piston via a pair of juxtaposed grooves provided in the piston and in a portion of the piston rod to define between themselves an enclosed channel in which spherical retaining members are accommodated, with an opening being provided which communicates with this channel and permits the introduction and removal of the spherical members.
Inventors
- 👤 H Siegel
- 👤 A Kraisel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:07
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1447; F16; F16J; F16J1/00; F16J1/10; F16J1/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
169 words
A cylinder and piston unit, comprising a cylinder bounded by an inner circumferential surface; a piston in said cylinder for guided movement therein and having an outer circumferential surface facing said inner surface; a piston rod; coupling means releasably coupling said piston rod with said piston, comprising at least one first peripheral groove in said piston and at least One second peripheral groove in said piston rod open to said first groove and defining with the same a peripheral channel; a plurality of spherical members accommodated in said channel and each partially projecting into the respective grooves; an outer circumferential recess provided in said outer surface; a radial bore in said piston dimensioned to permit passage of said spherical members, said bore having an outer end communicating with said recess and an inner open end communicating with said first groove; and a ring in said recess covering said outer open end and in sliding contact with said inner surface for guiding the movement of said piston in said cylinder.
Claim 2
Dependent Claim
169 words
A cylinder and piston unit, comprising a cylinder bounded by an inner circumferential surface; a piston in said cylinder for guided movement therein and having an outer circumferential surface facing said inner surface; a piston rod; coupling means releasably coupling said piston rod with said piston, comprising at least one first peripheral groove in said piston and at least One second peripheral groove in said piston rod open to said first groove and defining with the same a peripheral channel; a plurality of spherical members accommodated in said channel and each partially projecting into the respective grooves; an outer circumferential recess provided in said outer surface; a radial bore in said piston dimensioned to permit passage of said spherical members, said bore having an outer end communicating with said recess and an inner open end communicating with said first groove; and a ring in said recess covering said outer open end and in sliding contact with said inner surface for guiding the movement of said piston in said cylinder.
Claim 3
Dependent Claim
49 words
A cylinder and piston unit as defined in claim 1, said piston having an axial passage bounded by an inner surface provided with said first groove, and said piston rod having an end portion accommodated in said passage and bounded by an outer surface provided with said second groove.
Claim 4
Dependent Claim
21 words
A cylinder and piston unit as defined in claim 1, wherein said ring consists at least predominantly of synthetic plastic material.
Claim 5
Dependent Claim
18 words
A cylinder and piston unit as defined in claim 1, wherein said ring consists of synthetic plastic material.
Claim 6
Dependent Claim
37 words
A cylinder and piston unit as defined in claim 1, wherein said ring has an axial slit and is composed of a material admitting of resilient radial expansion of said ring with concomitant widening of said slit.
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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |