US3853272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle-mounted spray apparatus
Assignee: ETNYRE E AND CO
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Filing: 1973-09-27
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Granted: 1974-12-10
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Expires: 1993-09-27
Abstract
Abstract A street flusher in which the water pump is driven by a hydraulic motor which, in turn, is operated by pressure fluid supplied by a variable displacement hydraulic pump driven by the transmission of the truck. In order to maintain a substantially constant water pressure at all times, means are provided for automatically adjusting the delivery of the hydraulic pump in response to changes in truck speed and in response to a change in the number of spray nozzles in operation.
Inventors
- 👤 J Decker
- 👤 H Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:43
CPC Classifications
B; B05; B05B; B05B9/00; B05B9/03; B05B9/04; B05B9/06; A; A01; A01M; A01M7/00; A01M7/0089; E; E01; E01H; E01H1/00; E01H1/10; E01H1/101; E01H3/00; E01H3/02; F; F04; F04B; F04B17/00; F04B17/06; F04B49/00; F04B49/002; F04B49/08; F04B49/20; F04B9/00; F04B9/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
286 words
Apparatus comprising a hydraulic pump, a variable speed input drive connected to said pump, control means associated with said pump anD adjustable to different positions, the delivery rate of said pump changing when the speed of said input drive changes and said control means are in a fixed position and also changing when the speed of said input drive is constant and said control means are adjusted in first and second directions, a hydraulic motor connected to be driven by the delivery of said pump, a second pump connected to be driven by said motor and operable when driven to discharge liquid under pressure, and a series of spray nozzles connected to receive the liquid discharged from said second pump and adapted to be selectively opened or closed, the discharge pressure of said second pump changing when the delivery rate of said hydraulic pump changes and a certain number of said nozzles are open and also changing when the delivery rate of said hydraulic pump is constant and a different number of nozzles are open, the improvement in said apparatus comprising, a reversible fluid-operated actuator connected to adjust said control mmeans, a source of pressure fluid at constant pressure and acting on said actuator to bias said control means in said first direction, the discharge pressure of said second pump acting on said actuator to bias said control means in said second direction whereby said control means seek a position in which said actuator is balanced by said constant pressure and said discharge pressure and in which the discharge pressure is at a substantially constant magnitude determined by the magnitude of said constant pressure, and means selectively operable to adjust the magnitude of said constant pressure.
Claim 2
Dependent Claim
286 words
Apparatus comprising a hydraulic pump, a variable speed input drive connected to said pump, control means associated with said pump anD adjustable to different positions, the delivery rate of said pump changing when the speed of said input drive changes and said control means are in a fixed position and also changing when the speed of said input drive is constant and said control means are adjusted in first and second directions, a hydraulic motor connected to be driven by the delivery of said pump, a second pump connected to be driven by said motor and operable when driven to discharge liquid under pressure, and a series of spray nozzles connected to receive the liquid discharged from said second pump and adapted to be selectively opened or closed, the discharge pressure of said second pump changing when the delivery rate of said hydraulic pump changes and a certain number of said nozzles are open and also changing when the delivery rate of said hydraulic pump is constant and a different number of nozzles are open, the improvement in said apparatus comprising, a reversible fluid-operated actuator connected to adjust said control mmeans, a source of pressure fluid at constant pressure and acting on said actuator to bias said control means in said first direction, the discharge pressure of said second pump acting on said actuator to bias said control means in said second direction whereby said control means seek a position in which said actuator is balanced by said constant pressure and said discharge pressure and in which the discharge pressure is at a substantially constant magnitude determined by the magnitude of said constant pressure, and means selectively operable to adjust the magnitude of said constant pressure.
Claim 3
Dependent Claim
35 words
Apparatus as defined in claim 1 in which said spray nozzles are supported on a power-driven vehicle and are used for flushing streets, said input drive being derived from the drive train of said vehicle.
Claim 4
Dependent Claim
77 words
Apparatus as defined in claim 2 in which said source of pressure fluid is derived from the delivery of a charge pump associated with said hydraulic pump and adapted to supply make-up oil to the hydraulic system which includes said hydraulic pump and motor, said last-mentioned means comprising a constant pressure regulator connected in the fluid system between said charge pump and said actuator and adjustable to different settings to adjust the magnitude of said constant pressure.
References Cited (Backward Citations)
US3330443A
Cited
US3693838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |