US3792791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed responsive governor operated system for pump control
Assignee: Bank of New England NA
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Filing: 1971-11-17
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Granted: 1974-02-19
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Expires: 1991-11-17
Abstract
Abstract A mechanical governor is connected by a flexible shaft to the main engine for a mobile construction machine for sensing the speed of such engine. The governor is connected by a linkage to the control arm of a modulating air valve positioned in the air control circuit for the hydraulic dig pump between the pump and the operator''s manual control in the cab of the machine. Springloaded means on the governor can be manually adjusted to alter a set-point at which the governor influences the modulating air valve. As the hydraulic horsepower requirements increase during the work cycle of the machine, the main engine will tend to slow down. The governor, through the flexible shaft, senses this change in engine speed, or revolutions per minute, and moves the control lever on the modulating air valve to decrease the air pressure supplied to the hydraulic dig pump control. The reduction in air pressure controls the destroking of the hydraulic pump and reduces the hydraulic horsepower output to a level that can be satisfied by the output of the main engine. Accordingly, the speed responsive governor will eliminate engine stall-out under peak load conditions, and thus allow the operator to maintain full system hydraulic pressure at all times with attendant increases in the productivity of the machine and in the ease of controlling same.
Inventors
- 👤 C Fleming
- 👤 M Wege
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:22
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/20; E02F9/22; E02F9/2264; E02F9/2267; E02F9/2246; E02F9/2271; E02F9/2278; E02F9/2285; E02F9/2292; E02F9/2296; F; F04; F04B; F04B49/00; F04B49/002; F16; F16H; F16H43/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
201 words
In combination, a mobile construction machine including a tool movably mounted on the machine, a main engine, a compressor, said engine driving said compressor to provide pressurized air, a source of hydraulic fluid, variable volume hydraulic pump means, air-actuable control means for regulating the output of said pump means, conduit means for delivering pressurized air to said pump control means; said pump means being connected to the source of hydraulic fluid for pressurization therefrom, at least one hydraulic cylinder with a piston mounted therein, said piston being operably connected with the tool for performing a machine function, said pump means supplying varying amounts of hydraulic fluid to said hydraulic cylinder to control the movement of the piston and the tool operated thereby, the improvement comprising: modulating valve means connected in said conduit means for regulating the pressure of the air delivered to said pump control means, and speed responsive control means operably connected to said main engine and said modulating valve means to positively shift said modulating valve means to reduce air pressure in response to a predetermined decrease in the speed of of said engine, as may be caused by the tool encountering resistance, to prevent stalling of said engine.
Claim 2
Dependent Claim
201 words
In combination, a mobile construction machine including a tool movably mounted on the machine, a main engine, a compressor, said engine driving said compressor to provide pressurized air, a source of hydraulic fluid, variable volume hydraulic pump means, air-actuable control means for regulating the output of said pump means, conduit means for delivering pressurized air to said pump control means; said pump means being connected to the source of hydraulic fluid for pressurization therefrom, at least one hydraulic cylinder with a piston mounted therein, said piston being operably connected with the tool for performing a machine function, said pump means supplying varying amounts of hydraulic fluid to said hydraulic cylinder to control the movement of the piston and the tool operated thereby, the improvement comprising: modulating valve means connected in said conduit means for regulating the pressure of the air delivered to said pump control means, and speed responsive control means operably connected to said main engine and said modulating valve means to positively shift said modulating valve means to reduce air pressure in response to a predetermined decrease in the speed of of said engine, as may be caused by the tool encountering resistance, to prevent stalling of said engine.
Claim 3
Dependent Claim
201 words
In combination a mobile construction machine including a tool movably mounted on the machine, a main engine, a compressor, said engine driving said compressor to provide pressurized air, a source of hydraulic fluid, variable volume hydraulic pump means, air-actuable control means for regulating the output of said pump means, conduit means for delivering pressurized air to said pump control means; said pump means being connected to the source of hydraulic fluid for pressurization therefrom, at least one hydraulic cylinder with a piston mounted theRein, said piston being operatively connected with the tool for performing a machine function, said pump means supplying varying amounts of hydraulic fluid to said hydraulic cylinder to control the movement of the piston and the tool operated thereby, the improvement comprising: modulating valve means connected in said conduit means for regulating the pressure of the air delivered to said pump control means, and speed responsive control means operatively connected between said main engine and said modulating valve means to adjust said valve means in accordance with the speed of said engine to prevent stalling of said engine; said speed responsive control means including a flexible cable driven by said engine and a governor driven by said cable.
Claim 4
Dependent Claim
201 words
In combination a mobile construction machine including a tool movably mounted on the machine, a main engine, a compressor, said engine driving said compressor to provide pressurized air, a source of hydraulic fluid, variable volume hydraulic pump means, air-actuable control means for regulating the output of said pump means, conduit means for delivering pressurized air to said pump control means; said pump means being connected to the source of hydraulic fluid for pressurization therefrom, at least one hydraulic cylinder with a piston mounted theRein, said piston being operatively connected with the tool for performing a machine function, said pump means supplying varying amounts of hydraulic fluid to said hydraulic cylinder to control the movement of the piston and the tool operated thereby, the improvement comprising: modulating valve means connected in said conduit means for regulating the pressure of the air delivered to said pump control means, and speed responsive control means operatively connected between said main engine and said modulating valve means to adjust said valve means in accordance with the speed of said engine to prevent stalling of said engine; said speed responsive control means including a flexible cable driven by said engine and a governor driven by said cable.
Claim 5
Dependent Claim
27 words
The combination of claim 2 wherein adjustable means are provided for the governor to alter the speed at which said governor will respond to the engine speed.
Claim 6
Dependent Claim
45 words
The combination of claim 3 wherein said adjustable means comprises a shaft extending through the housing for said governor, a first lever secured thereon, a second lever mounted for pivotal movement disposed in proximity thereto, and spring means for biasing said levers toward one another.
Claim 7
Dependent Claim
22 words
The combination of claim 4 wherein adjustable set screws are provided to change the position of said levers relative to one another.
Claim 8
Dependent Claim
26 words
The combination of claim 2 wherein a control arm is operatively associated with said modulating valve means, and a linkage connects said arm to said governor.
Claim 9
Dependent Claim
198 words
In combination, a mobile construction machine including a tool movably mounted on the machine a main engine, a compressor, said engine driving said compressor to provide pressurized air, a source of hydraulic fluid, variable volume hydraulic pump means, air-actuable control means for regulating the output of said pump means, conduit means for delivering pressurized air to said pump control means; said pump means being connected to the source of hydraulic fluid for pressurization therefrom at least one hydraulic cylinder with a piston mounted therein, said piston being operatively connected with the tool for performing a machine function, said pump means supplying varying amounts of hydraulic fluid to said hydraulic cylinder to control the movement of the piston and the tool operated thereby, the improvement comprising: modulating valve means connected in said conduit means for regulating the pressure of air delivered to said pump control means, speed responsive control means operatively connected between said main engine and said modulating valve means to adjust said valve means in accordance with the speed of said engine to prevent stalling of said engine; and air-operated relay valve means connected in said conduit means at a location upstream of said modulating valve means.
Claim 10
Dependent Claim
198 words
In combination, a mobile construction machine including a tool movably mounted on the machine a main engine, a compressor, said engine driving said compressor to provide pressurized air, a source of hydraulic fluid, variable volume hydraulic pump means, air-actuable control means for regulating the output of said pump means, conduit means for delivering pressurized air to said pump control means; said pump means being connected to the source of hydraulic fluid for pressurization therefrom at least one hydraulic cylinder with a piston mounted therein, said piston being operatively connected with the tool for performing a machine function, said pump means supplying varying amounts of hydraulic fluid to said hydraulic cylinder to control the movement of the piston and the tool operated thereby, the improvement comprising: modulating valve means connected in said conduit means for regulating the pressure of air delivered to said pump control means, speed responsive control means operatively connected between said main engine and said modulating valve means to adjust said valve means in accordance with the speed of said engine to prevent stalling of said engine; and air-operated relay valve means connected in said conduit means at a location upstream of said modulating valve means.
Claim 11
Dependent Claim
73 words
The combination as defined in claim 7 wherein said air-operated relay valve means includes inlet means and outlet means, and a pilot-operator supplied with a variable pressure signal, said inlet means connected to a source of pressurized air, a shiftable cylinder within the housing of said valve means, and a spring normally urging said cylinder into a blocking position to prevent the passage of air from said inlet means to said outlet means.
Claim 12
Dependent Claim
49 words
The combination of claim 8 wherein said cylinder is shifted from its blocking position against the urging of the spring when the combined pressure of the maximum variable pressure at the pilot operator and the air received from the source of pressurized air exceed the force of the spring.
Claim 13
Dependent Claim
48 words
The combination of claim 8 wherein the pilot operator for said air-operated relay valve means is disposed atop the housing for the relay means, and a tank is disposed below the housing for the relay means, said tank receiving the air that is normally blocked by said cylinder.
Claim 14
Dependent Claim
17 words
The combination of claim 10 wherein a by-pass conduit connects said tank to said modulating valve means.
Claim 15
Dependent Claim
116 words
A power implement comprising: enGine means; a movably mounted tool; power means connected to said tool for moving said tool; fluid pressurizing means driven by said engine for pressurizing fluid; conduit means fluidly interconnecting said fluid pressurizing means and said power means for actuating said power means; modulating valve means operably disposed for varying the volume of fluid supplied to said power means; and governor means operably connected to said engine and said modulating valve means for positively shifting the latter to reduce the volume of fluid supplied to said power means in response to a predetermined decrease in engine speed, as may be caused by the tool encountering resistance, to prevent said engine from stalling.
Claim 16
Dependent Claim
116 words
A power implement comprising: enGine means; a movably mounted tool; power means connected to said tool for moving said tool; fluid pressurizing means driven by said engine for pressurizing fluid; conduit means fluidly interconnecting said fluid pressurizing means and said power means for actuating said power means; modulating valve means operably disposed for varying the volume of fluid supplied to said power means; and governor means operably connected to said engine and said modulating valve means for positively shifting the latter to reduce the volume of fluid supplied to said power means in response to a predetermined decrease in engine speed, as may be caused by the tool encountering resistance, to prevent said engine from stalling.
Claim 17
Dependent Claim
38 words
Apparatus according to claim 12 and further including relay valve means operably disposed in said conduit means for blocking flow of pressurized fluid to said modulating valve means while said engine is in a preselected mode of operation.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |