US3904129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic system for vehicular spreader
Assignee: Highway Equipment Co
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Filing: 1974-09-16
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Granted: 1975-09-09
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Expires: 1994-09-16
Abstract
Abstract A vehicular spreader has a pressure-compensated flow control valve receiving fluid from a variable displacement pump. Bypass fluid from the valve controls the displacement of the pump. The controlled flow of the valve feeds a manual selector valve having two positions. In one position, the selector valve feeds constant speed spinner motors for dispensing salt or the like. Connected in series with the spinner motors is a rate-responsive differential control valve which controls the speed of the conveyor motor feeding materials to the spinner as a function of ground speed of the vehicle. A feedback signal from the conveyor motor to the differential control valve insures an accurate, quick response even at low speeds. In another position, the selector valve permits high-speed operation of the conveyor for pit dumping with the differential control valve closed, or the use of an auxiliary hydraulic device with the differential control valve opened.
Inventors
- 👤 Allan L Lorenc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:27
CPC Classifications
A; A01; A01C; A01C17/00; A01C17/006; E; E01; E01C; E01C19/00; E01C19/12; E01C19/20; E01C19/201; E01C19/202; E01C19/203; F; F15; F15B; F15B11/00; F15B11/02; F15B11/04; F15B11/042; F15B21/00; F15B21/08; F15B21/082; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20546; F15B2211/20553; F15B2211/255; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/40523; F15B2211/45; F15B2211/455; F15B2211/70; F15B2211/705; F15B2211/7058; F15B2211/71; F15B2211/7114; F15B2211/7121; F15B2211/7128; F15B2211/75; Y; Y10; Y10T; Y10T137/00; Y10T137/0971; Y10T137/0989
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
185 words
A hydraulic system for use with a vehicular spreader having a source of material to be spread, a conveyor beneath said material for conveying the same to a spinner driven by spinner motor means, said conveyor being driven by a conveyor motor, said vehicle further including a prime mover, the improvement comprising: a variable displacement pump driven by said prime mover and including a flow control input port; pressurecompensated flow control valve means receiving fluid from said pump means for delivering the same at a generally constant flow rate to an output port and including a bypass port; means for connecting the bypass port of said flow control valve to the flow control inlet port of said pump; means connecting said spinner motor means in circuit with said pump; differential flow control valve means connected across said conveyor motor and in circuit with said spinner motor means and responsive to a first control signal representative of the ground speed of the vehicle and a second feedback signal representative of the speed of said conveyor motor to adjust the flow of fluid to said conveyor motor.
Claim 2
Dependent Claim
185 words
A hydraulic system for use with a vehicular spreader having a source of material to be spread, a conveyor beneath said material for conveying the same to a spinner driven by spinner motor means, said conveyor being driven by a conveyor motor, said vehicle further including a prime mover, the improvement comprising: a variable displacement pump driven by said prime mover and including a flow control input port; pressurecompensated flow control valve means receiving fluid from said pump means for delivering the same at a generally constant flow rate to an output port and including a bypass port; means for connecting the bypass port of said flow control valve to the flow control inlet port of said pump; means connecting said spinner motor means in circuit with said pump; differential flow control valve means connected across said conveyor motor and in circuit with said spinner motor means and responsive to a first control signal representative of the ground speed of the vehicle and a second feedback signal representative of the speed of said conveyor motor to adjust the flow of fluid to said conveyor motor.
Claim 3
Dependent Claim
53 words
The apparatus of claim 1 wherein said fluid control valve means is rate-responsive and includes an aperture, the size of which is controlled by a movable spool, the position of said spool being responsive both to said ground speed control signal and said feedback signal representative of the speed of said conveyor motor.
Claim 4
Dependent Claim
30 words
The apparatus of claim 1 wherein said flow control valve means is manually adjustable, whereby the output thereof can be adjusted according to the requirements of the material being spread.
Claim 5
Dependent Claim
42 words
The apparatus of claim 3 wherein said flow control valve includes a control lever in the operator''s cab, whereby when the controlled output thereof is shut off, the bypass output de-strokes the pump to shut down the spreader system during over-the-road travel.
Claim 6
Dependent Claim
100 words
The apparatus of claim 1 further comprising a selector valve having a first and a second position and connected to the controlled flow output of said flow control valve, the first output thereof communicating with said spinner motor means; a disconnect communicating said manual selector valve in said second position directly with said differential flow control valve and said conveyor motor, whereby when said selector valve is in said second position and said differential valve is closed, said conveyor motor may be operated at desired speed as controlled by said pressure compensated flow control valve in a pit dump mode.
Claim 7
Dependent Claim
55 words
The apparatus of claim 5 further comprising second quick disconnect means adapted to replace said first quick disconnect means to interrupt the fluid circuit for the insertion of an auxiliary hydraulic device, whereby when said differential valve means is open, said auxiliary device may be operated by said pump and said conveyor motor is bypassed.
Claim 8
Dependent Claim
169 words
In a hydraulic system adapted for use with a vehicular spreader wherein the vehicle is equipped with a prime mover, spinner motor means operating a spinner, and a conveyor motor operating a conveyor to move material from a storage location to said spreader, the improvement comprising: a variable displacement pump having an input flow control port associated with a mechanism for de-stroking said pump as the volume at said inlet flow control port increases; pressure-compensated flow control valve means delivering fluid from said pump at a constant flow rate and including a bypass port; means for communicating said bypass port with said input flow control port of said pump means; means communicating said spinner motor means with the output of said flow control valve; and a differential flow control valve having a spool-operated orifice connected across said conveyor motor, the position of said spool being responsive to a first signal representative of ground speed of the vehicle and a second signal representative of the speed of said conveyor motor.
Claim 9
Dependent Claim
169 words
In a hydraulic system adapted for use with a vehicular spreader wherein the vehicle is equipped with a prime mover, spinner motor means operating a spinner, and a conveyor motor operating a conveyor to move material from a storage location to said spreader, the improvement comprising: a variable displacement pump having an input flow control port associated with a mechanism for de-stroking said pump as the volume at said inlet flow control port increases; pressure-compensated flow control valve means delivering fluid from said pump at a constant flow rate and including a bypass port; means for communicating said bypass port with said input flow control port of said pump means; means communicating said spinner motor means with the output of said flow control valve; and a differential flow control valve having a spool-operated orifice connected across said conveyor motor, the position of said spool being responsive to a first signal representative of ground speed of the vehicle and a second signal representative of the speed of said conveyor motor.
References Cited (Backward Citations)
US3441039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |