US3592105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic pump or motor with spherical piston
Assignee: ABB Norden Holding AB
•
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 20:57
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)
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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 |