US3751174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic system for paver
Assignee: LAYTON MANUF CO
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Filing: 1971-08-10
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Granted: 1973-08-07
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Expires: 1991-08-10
Abstract
Abstract A paver having hitch arms adapted to be brought together to couple it to a towing vehicle, a gate raisable to open up discharge from the paver, and a lift actuatable to lift a screed in the paver from the ground. A hydraulic motor is provided for actuating each of the above under power. Manually operated pump mechanism drawing fluid from a reservoir is actuatable to supply fluid under pressure to each of said hydraulic motors. An electrically operated or driven pump having an intake connected to said reservoir and a system of selector valve and control valves provides for the supply of pressure fluid to each of such hydraulic motors by electrically energized means. Check valves associated with the manually operated pump mechanism, and check valves associated with the control valves supplied by the electrically driven pump permit the operation of either the manually operated pump mechanism or the electrically powered pump without interference of such operation by the pumping instrumentality which is inactive.
Inventors
- 👤 J Layton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:23
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/48; E01C19/4866; E01C19/4873
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
316 words
In combination with a paver having hitch arms adapted to be brought together to couple the paver to a towing vehicle, a first hydraulic motor for bringing the arms together under power, a gate raisable to open up discharge of aggregate from the paver, and a second hydraulic motor for raising the gate, a reservoir for holding hydraulic fluid, a first motor feed conduit connecting with said first hydraulic motor for supplying fluid thereto to actuate the motor, and a second motor feed conduit connecting with the second hydraulic motor for supplying fluid thereto to actuate the motor, manually operated pump means having an intake connected to said reservoir and a discharge, means connecting said discharge to said first and second motor feed conduits, said pump means being selectively operable to deliver hydraulic fluid either to said first or to said second motor feed conduit, the means connecting said discharge with Said first and second motor feed conduits including a first check valve checking flow from the first motor feed conduit into the pump means and a second check valve checking the flow from the second motor feed conduit into the pump means, a bypass valve for each of said check valves openable to bypass the check valve, an electrically driven pump having an intake connected with said reservoir and a discharge, and means connecting said discharge of said electrically driven pump to said first and second motor feed conduits, said means connecting said discharge of the electrically driven pump including selectively operated valve means for directing fluid selectively to said first or to said second motor feed conduit, the connection with said first motor feed conduit being located relative to said manually operated pump means downstream of said first check valve and the connection with said second motor feed conduit being located relative to said manually operated pump means downstream from said second check valve.
Claim 2
Dependent Claim
316 words
In combination with a paver having hitch arms adapted to be brought together to couple the paver to a towing vehicle, a first hydraulic motor for bringing the arms together under power, a gate raisable to open up discharge of aggregate from the paver, and a second hydraulic motor for raising the gate, a reservoir for holding hydraulic fluid, a first motor feed conduit connecting with said first hydraulic motor for supplying fluid thereto to actuate the motor, and a second motor feed conduit connecting with the second hydraulic motor for supplying fluid thereto to actuate the motor, manually operated pump means having an intake connected to said reservoir and a discharge, means connecting said discharge to said first and second motor feed conduits, said pump means being selectively operable to deliver hydraulic fluid either to said first or to said second motor feed conduit, the means connecting said discharge with Said first and second motor feed conduits including a first check valve checking flow from the first motor feed conduit into the pump means and a second check valve checking the flow from the second motor feed conduit into the pump means, a bypass valve for each of said check valves openable to bypass the check valve, an electrically driven pump having an intake connected with said reservoir and a discharge, and means connecting said discharge of said electrically driven pump to said first and second motor feed conduits, said means connecting said discharge of the electrically driven pump including selectively operated valve means for directing fluid selectively to said first or to said second motor feed conduit, the connection with said first motor feed conduit being located relative to said manually operated pump means downstream of said first check valve and the connection with said second motor feed conduit being located relative to said manually operated pump means downstream from said second check valve.
Claim 3
Dependent Claim
105 words
The combination of claim 1, wherein the first and second hydraulic motors each comprise a single acting hydraulic ram, actuated with a supply of fluid thereto to bring the arms together and to raise the gate, respectively, the arms being movable apart and the gate lowering by forces generated externally of the rams and the rams during such movement forcing fluid in a return direction toward the manually operated pump means, and wherein said means connecting the discharge of the electrically driven pump to said first and second motor feed conduits includes check valve means checking flow in a direction toward the electrically driven pump.
Claim 4
Dependent Claim
63 words
The combination of claim 1, wherein the electrically driven pump includes a motor on said paver which drives the pump, and which further includes switch means actuated to start said motor disposed so that actuation is coordinated with actuation of the selectively operated valve means for directing fluid selectively from the electrically driven pump to said first and said second motor feed conduits.
Claim 5
Dependent Claim
111 words
The combination of claim 1, wherein said selectively operated valve means for directing fluid selectively to said first and second motor feed conduits includes a first control valve controlling flow to the first motor feed conduit and a second control valve controlling flow to the second motor feed conduit, each control valve including an inlet port connected to the electrically driven pump, a first outlet port connected to a motor feed conduit, and a second outlet port connected to said reservoir, the connection of said outlet port of each control valve with the motor feed conduit including a check valve checking flow from the motor feed conduit into the control valve.
Claim 6
Dependent Claim
50 words
The combination of claim 4, wherein the electrically driven pump includes a motor on said paver which drives the pump, and which further includes switch means for each of said control valves actuatable to start the motor and disposed so that actuation is coordinated with actuation of the control valve.
Claim 7
Dependent Claim
96 words
The combination of claim 4, wherein said selectively operated valve means for directing fluid selectively to said first or said second motor feed conduit further includes a selector valve, the connection of each of said control valves with the electrically driven pump being through said selector valve, the selector valve having one adjusted position where hydraulic fluid pumped by the electrically driven pump is directed to one control valve exclusively of the other, and another adjusted position wherein fluid pumped by the electrically driven pump is directed to the other control valve exclusively of the one.
Claim 8
Dependent Claim
324 words
In combination with a paver having hitch arms as one adjustable mechanism thereon, and another adjustable mechanism which together with the hitch arms is adjusted to modify paver operation, a first hydraulic motor for adjusting one of said mechanisms under power and a second hydraulic motor for adjusting the oTher of said mechanisms under power, a reservoir for holding hydraulic fluid, an electrically operated pump having a discharge, and an intake connected to said reservoir to draw fluid therefrom, a selector valve having an inlet port connecting the discharge of said pump and at least a pair of outlet ports, a first control valve connected to one outlet port of said selector valve and a second control valve connected to the other outlet port of said selector valve, each of said control valves having a dump port connected to said reservoir, an outlet port, and a spool shiftable axially to close selectively either one or the other of said ports, a discharge conduit including a check valve connected to each outlet port with the check valve checking flow in the conduit toward the control valve, first and second manually operated pumps, each having an intake connected to said reservoir, a discharge, and a check valve in the discharge checking flow from the discharge into the pump, a first motor feed conduit connecting said first manually operated pump through the check valve of the pump to said first hydraulic motor and a second motor feed conduit connecting said second manually operated pump through the check valve of the pump to said second hydraulic motor, and a connection of one discharge conduit with said first motor feed conduit at a point relative to said first manually operated pump which is downstream from its check valve, and a connection of the other discharge conduit with the second motor feed conduit at a point relative to said second manually operated pump which is downstream from its check valve.
Claim 9
Dependent Claim
324 words
In combination with a paver having hitch arms as one adjustable mechanism thereon, and another adjustable mechanism which together with the hitch arms is adjusted to modify paver operation, a first hydraulic motor for adjusting one of said mechanisms under power and a second hydraulic motor for adjusting the oTher of said mechanisms under power, a reservoir for holding hydraulic fluid, an electrically operated pump having a discharge, and an intake connected to said reservoir to draw fluid therefrom, a selector valve having an inlet port connecting the discharge of said pump and at least a pair of outlet ports, a first control valve connected to one outlet port of said selector valve and a second control valve connected to the other outlet port of said selector valve, each of said control valves having a dump port connected to said reservoir, an outlet port, and a spool shiftable axially to close selectively either one or the other of said ports, a discharge conduit including a check valve connected to each outlet port with the check valve checking flow in the conduit toward the control valve, first and second manually operated pumps, each having an intake connected to said reservoir, a discharge, and a check valve in the discharge checking flow from the discharge into the pump, a first motor feed conduit connecting said first manually operated pump through the check valve of the pump to said first hydraulic motor and a second motor feed conduit connecting said second manually operated pump through the check valve of the pump to said second hydraulic motor, and a connection of one discharge conduit with said first motor feed conduit at a point relative to said first manually operated pump which is downstream from its check valve, and a connection of the other discharge conduit with the second motor feed conduit at a point relative to said second manually operated pump which is downstream from its check valve.
Claim 10
Dependent Claim
123 words
The combination of claim 7, wherein the first and second hydraulic motors each comprise a single acting hydraulic ram, each of said rams being actuated with a supply of pressure fluid thereto to adjust a mechanism, each mechanism returning to its original condition by forces generated externally of the ram and during such adjustment forcing fluid in a reverse direction through the feed conduit which connects with the motor, and which further comprises a bypass for the check valve of each manually operated pump manually openable to permit reverse flow of fluid therethrough to said reservoir, and wherein each control valve includes a release for the check valve in the discharge conduit which connects with the control valve to accommodate reverse flow therethrough.
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |