US3585903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drain feedtube for hydraulic motor
Assignee: American LaFrance LLC
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Filing: 1969-12-05
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Granted: 1971-06-22
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Expires: 1989-12-05
Abstract
Abstract A telescopic feedtube for draining fluid from the housing of a motor carried on the end of an extensible boom or the like, separate from feedtubes which convey motive fluid to and from the motor, there being provided a reciprocating hydraulic motor for the boom controlled by a valve which is also connected to selectively supply fluid to the drain tube during retracting of the actuator for the purpose of providing a retracting force on the feedtube when the actuator is retracted minimizing the tendency of the drain feedtube to collapse.
Inventors
- 👤 John T Parrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:22
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/17; F16; F16L; F16L27/00; F16L27/12; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/20576; F15B2211/21; F15B2211/214; F15B2211/30; F15B2211/31; F15B2211/3105; F15B2211/3116; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/45; F15B2211/455
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
A hydraulic system, comprising: a first member, a second member, means for extending and retracting said first member with respect to said second member, fluid motor means associated with said second member, fluid supply means for delivering motive fluid to drive said motor means, fluid return means for returning motive fluid from said motor means, and means for draining fluid from said motor means including a first feedtube and a second feedtube in telescopic relation therewith, and fluid operable means for preventing collapsing of said feedtubes.
Claim 2
Dependent Claim
86 words
A hydraulic system, comprising: a first member, a second member, means for extending and retracting said first member with respect to said second member, fluid motor means associated with said second member, fluid supply means for delivering motive fluid to drive said motor means, fluid return means for returning motive fluid from said motor means, and means for draining fluid from said motor means including a first feedtube and a second feedtube in telescopic relation therewith, and fluid operable means for preventing collapsing of said feedtubes.
Claim 3
Dependent Claim
122 words
A hydraulic system, comprising: a first member, a second member, means for extending and retracting said first member with respect to said second member, fluid motor means associated with said second member, fluid supply means for delivering motive fluid to drive said motor means, fluid return means for returning motive fluid from said motor means, and means for draining fluid from said motor means including a fIrst feedtube and a second feedtube in telescopic relation therewith, the inner one of said feedtubes having piston means thereon, and means for supplying fluid to said piston means on the side thereof tending to retract said feedtubes to prevent collapsing of the feedtubes when the second member is retracted with respect to said first member.
Claim 4
Dependent Claim
122 words
A hydraulic system, comprising: a first member, a second member, means for extending and retracting said first member with respect to said second member, fluid motor means associated with said second member, fluid supply means for delivering motive fluid to drive said motor means, fluid return means for returning motive fluid from said motor means, and means for draining fluid from said motor means including a fIrst feedtube and a second feedtube in telescopic relation therewith, the inner one of said feedtubes having piston means thereon, and means for supplying fluid to said piston means on the side thereof tending to retract said feedtubes to prevent collapsing of the feedtubes when the second member is retracted with respect to said first member.
Claim 5
Dependent Claim
54 words
A hydraulic system as defined in claim 2, said first and second member including a telescopic hydraulic actuator, said motor means being carried by said second member, said motor means including a housing which serves as a reservoir for motor leakage fluid, means connected said feedtubes to receive drain fluid from said motor housing.
Claim 6
Dependent Claim
33 words
A hydraulic system as defined in claim 2, wherein said means for supplying pressure to said piston means includes means for supplying pressure at a value higher than the pressure of drain fluid.
Claim 7
Dependent Claim
29 words
A hydraulic system as defined in claim 2, said means for supplying fluid to said piston being operable when said second member retracts with respect to said first member.
Claim 8
Dependent Claim
70 words
A hydraulic system as defined in claim 5, said first and second members being extendable and retractable by a fluid operable reciprocating actuator, valve means for supplying fluid relatively to opposite sides of the actuator to extend and retract the same, said valve means being connected to supply fluid under pressure to said means for supplying fluid to said feedtube piston means only when supplying fluid to retract said actuator.
Claim 9
Dependent Claim
95 words
A hydraulic system as defined in claim 3, said first and second members being extendible and retractable by a hydraulic actuator, one of said feedtubes being fixed with respect to one of said members, the other of said feedtubes being fixed with respect to the other of said members, one of said feedtubes having said piston means thereon slidable in the other of said feedtubes, said piston means defining a retract fluid chamber in the other of said feedtubes, said means for supplying fluid to said feedtubes being connected to supply fluid to said chamber.
Claim 10
Dependent Claim
74 words
A hydraulic system, comprising: a hydraulic actuator having first and second relatively extendible members, fluid operable motor means carried by one of said members, said motor having a drain reservoir, means for supplying fluid to said motor means, means for returning fluid from said motor means, elongated telescopic feedtube means separate from said return means for draining fluid from said drain reservoir, and means tending to retract said feedtube means to prevent collapse thereof.
Claim 11
Dependent Claim
74 words
A hydraulic system, comprising: a hydraulic actuator having first and second relatively extendible members, fluid operable motor means carried by one of said members, said motor having a drain reservoir, means for supplying fluid to said motor means, means for returning fluid from said motor means, elongated telescopic feedtube means separate from said return means for draining fluid from said drain reservoir, and means tending to retract said feedtube means to prevent collapse thereof.
References Cited (Backward Citations)
US3207044A
Cited
US3318199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |