Patent US3592105A successfully refreshed from Google Patents.
US3592105A
Expired / Lapsed
US
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Hydrostatic pump or motor with spherical piston
Assignee: ABB Norden Holding AB
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Filing: 1969-07-17
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Granted: 1971-07-13
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Expires: 1989-07-17
Abstract
Abstract A hydraulic energy converting device applicable to both pumps and motors, such devices employing an obliquely pivoted swash plate to interact with a spherical piston. The axial component of the force on the piston causes wear. This wear is minimized by providing a bowl-shaped piston with a ball-contacting seat and interposing a ball between the piston and the swash plate. Pressure-communicating arrangements in the piston permit fluid pressure and the ball to interact directly, minimizing the force of contact between ball and seat.
Inventors
- 👤 Per Fryklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:14
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/122; F04B1/124; F01; F01B; F01B3/00; F01B3/0032; F01B3/0044; F01B3/0052; F01B3/0082; F01B3/0085
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
In an hydraulic energy converting device having at least one operating cylinder with a piston reciprocable therein and having a spherical surface engaging the cylinder wall, camming means, a ball between said piston and said camming means for transmitting driving forces between said camming means and said piston, the improvement wherein said spherical piston contains a concave seat for said force-transmitting ball.
Claim 2
Dependent Claim
62 words
In an hydraulic energy converting device having at least one operating cylinder with a piston reciprocable therein and having a spherical surface engaging the cylinder wall, camming means, a ball between said piston and said camming means for transmitting driving forces between said camming means and said piston, the improvement wherein said spherical piston contains a concave seat for said force-transmitting ball.
Claim 3
Dependent Claim
31 words
The improvement of claim 1 wherein said concave seat includes an annular, spherical contact surface, whereby a space is defined between said ball seated on said contact surface and said piston.
Claim 4
Dependent Claim
26 words
The improvement of claim 2 further comprising means in said piston to provide pressure communication between said space and the space in front of the piston.
References Cited (Backward Citations)
US459735A
Cited
US1325434A
Cited
US2712794A
Cited
US3056357A
Cited
US3264951A
Cited
US3366017A
Cited
US3435774A
Cited
US3435775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |