US3885389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manifold with internal filter
Assignee: AUTOMATIC HYDRAULIC DEVICES Inc A MI CORP
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Filing: 1973-09-26
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Granted: 1975-05-27
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Expires: 1993-09-26
Abstract
Abstract A hydrostatic transmission drive has an integrated pump, valve and manifold interconnecting the pump and valve with a hydraulic actuator. The manifold has a replaceable filter cartridge located in a bore. The filter cartridge has a design capacity to eliminate normal amounts of contamination originally in, and entering into the system during the life of the drive, and is composed of a metallic fabric material that will not fail under pressure due to dirt build-up on the filter and will not itself disintegrate in time and add additional contamination to the hydraulic fluid.
Inventors
- 👤 James S Hull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:22
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/06; F15B13/08; F15B13/0803; F15B13/0807; F15B13/0814; F15B13/0832; F15B13/0835; F15B13/0871; F15B13/0878; F15B13/0885; F15B13/0892; F15B13/0896
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
189 words
A manifold assembly for connecting a hydraulic pump with a hydraulic actuator for driving the same in one direction or the other as determined by a four way valve, said manifold having a first set of ports adapted to be connected to the pump for receiving fluid under pressure from the pump and returning fluid to the pump, a second set of ports adapted to be connected to the actuator to direct fluid under pressure to the actuator and receive fluid from the actuator, first and second sets of valve ports adapted to be connected to the four-way valve, a plurality of passages in the manifold for connecting the first set of ports with the first pair of valve ports and for connecting the second set of ports with the second pair of valve ports, a bore in said manifold interposed in one of the plurality of passages connecting the four-way valve with one of the first set of ports so as to return fluid to the pump, and a removable filter cartridge in said bore located so as to filter fluid flowing from said four-way valve to pump.
Claim 2
Dependent Claim
189 words
A manifold assembly for connecting a hydraulic pump with a hydraulic actuator for driving the same in one direction or the other as determined by a four way valve, said manifold having a first set of ports adapted to be connected to the pump for receiving fluid under pressure from the pump and returning fluid to the pump, a second set of ports adapted to be connected to the actuator to direct fluid under pressure to the actuator and receive fluid from the actuator, first and second sets of valve ports adapted to be connected to the four-way valve, a plurality of passages in the manifold for connecting the first set of ports with the first pair of valve ports and for connecting the second set of ports with the second pair of valve ports, a bore in said manifold interposed in one of the plurality of passages connecting the four-way valve with one of the first set of ports so as to return fluid to the pump, and a removable filter cartridge in said bore located so as to filter fluid flowing from said four-way valve to pump.
Claim 3
Dependent Claim
58 words
The manifold assembly of claim 1 wherein a third set of ports are provided with each port thereof connected to one of the plurality of passages connecting said second set of ports with the second pair of valve ports, and relief valves connected to said third set of ports to limit the pressure in said last named passages.
Claim 4
Dependent Claim
34 words
The manifold assembly of claim 1 wherein said filter cartridge is made of a woven metallic material not susceptible to disintegration and hence migration of particles from the filter cartridge into the hydraulic fluid.
Claim 5
Dependent Claim
169 words
A hydrostatic drive assembly including a pump, a manifold mounted on the pump and hydraulically connected thereto, a control valve mounted on the manifold and hydraulically connected thereto, a hydraulic actuator hydraulically connected to the manifold, the manifold having a plurality of ports communicating with the pump and with the actuator, a plurality of valve ports communicating with the valve, a plurality of passages connecting certain ones of the plurality of ports to certain ones of the plurality of valve ports and connecting certain other ones of the plurality of ports to certain other ones of the plurality of valve ports so as to permit fluid to be transferred therethrough by way of the valve to and from the pump and to and from the actuator, a filter receiving bore in the manifold intercepting one of the plurality of passages for transferring fluid between the valve and the pump, and a replaceable metallic filter element positioned within the bore for filtering hydraulic fluid flowing through said last named passage.
Claim 6
Dependent Claim
169 words
A hydrostatic drive assembly including a pump, a manifold mounted on the pump and hydraulically connected thereto, a control valve mounted on the manifold and hydraulically connected thereto, a hydraulic actuator hydraulically connected to the manifold, the manifold having a plurality of ports communicating with the pump and with the actuator, a plurality of valve ports communicating with the valve, a plurality of passages connecting certain ones of the plurality of ports to certain ones of the plurality of valve ports and connecting certain other ones of the plurality of ports to certain other ones of the plurality of valve ports so as to permit fluid to be transferred therethrough by way of the valve to and from the pump and to and from the actuator, a filter receiving bore in the manifold intercepting one of the plurality of passages for transferring fluid between the valve and the pump, and a replaceable metallic filter element positioned within the bore for filtering hydraulic fluid flowing through said last named passage.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |