US3971215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power shovel and crowd system therefor
Assignee: Marion Power Shovel Co Inc
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Filing: 1975-01-31
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Granted: 1976-07-27
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Expires: 1995-01-31
Abstract
Abstract A power shovel comprising a body; a front end assembly mounted on the body including a dipper; means for crowding the dipper; means for hoisting the dipper; and an energy regeneration system including an energy storing means and means actuated by a predetermined movement of at least one component of the front end assembly for charging the energy storing means, the energy storing means providing in the loaded condition a force applicable to a component of the front end assembly for at least biasing such component toward a predetermined movement.
Inventors
- 👤 George B. Baron
- 👤 Paul W. Padrutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:47
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; E02F3/427; E02F3/30; E02F3/308; E02F9/00; E02F9/20; E02F9/22; E02F9/2217
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
243 words
An actuating system comprising a fluid actuated, piston and cylinder assembly including a cylinder, a fixed piston mounted in said cylinder and a movable piston mounted on said fixed piston within said cylinder providing a first variable volume chamber defined by said fixed and movable pistons, a second variable volume chamber defined by said movable piston and said cylinder and a third variable volume chamber defined by said movable and fixed pistons and said cylinder; means for selectively supplying fluid under pressure to said first and second variable volume chambers, said selective means including a bi-directional, variable displacement pump and fluid supply lines operatively interconnecting said pump and said first and second chambers; a first accumulator constituting an energy storage means; a closed hydraulic circuit intercommunicating said third chamber and said accumulator, said closed hydraulic circuit including a cutoff valve disposed between said third chamber and said energy storing means; a first relief valve connected to said closed hydraulic circuit between said third chamber and said cutoff valve, adapted to open responsive to a predetermined pressure in said closed hydraulic circuit between said third chamber and said cutoff valve when said cutoff valve is closed; and a second relief valve connected to said closed hydraulic circuit between said energy storing means and said cutoff valve, adapted to open responsive to a predetermined pressure in said closed hydraulic circuit between said energy storing means and said cutoff valve when said cutoff valve is closed.
Claim 2
Dependent Claim
243 words
An actuating system comprising a fluid actuated, piston and cylinder assembly including a cylinder, a fixed piston mounted in said cylinder and a movable piston mounted on said fixed piston within said cylinder providing a first variable volume chamber defined by said fixed and movable pistons, a second variable volume chamber defined by said movable piston and said cylinder and a third variable volume chamber defined by said movable and fixed pistons and said cylinder; means for selectively supplying fluid under pressure to said first and second variable volume chambers, said selective means including a bi-directional, variable displacement pump and fluid supply lines operatively interconnecting said pump and said first and second chambers; a first accumulator constituting an energy storage means; a closed hydraulic circuit intercommunicating said third chamber and said accumulator, said closed hydraulic circuit including a cutoff valve disposed between said third chamber and said energy storing means; a first relief valve connected to said closed hydraulic circuit between said third chamber and said cutoff valve, adapted to open responsive to a predetermined pressure in said closed hydraulic circuit between said third chamber and said cutoff valve when said cutoff valve is closed; and a second relief valve connected to said closed hydraulic circuit between said energy storing means and said cutoff valve, adapted to open responsive to a predetermined pressure in said closed hydraulic circuit between said energy storing means and said cutoff valve when said cutoff valve is closed.
Claim 3
Dependent Claim
135 words
An actuating system comprising a fluid actuated, piston and cylinder assembly including a cylinder, a fixed piston mounted in said cylinder and a movable piston mounted on said fixed piston within said cylinder providing a first variable volume chamber defined by said fixed and movable pistons, a second variable volume chamber defined by said movable piston and said cylinder and a third variable volume chamber defined by said movable and fixed pistons and said cylinder; means for selectively supplying fluid under pressure to said first and second variable volume chambers; a first accumulator constituting an energy storage means; a closed hydraulic circuit intercommunicating said third chamber and said accumulator; a second accumulator; and means responsive to a sudden decompression of the fluid in said first and second variable volume chambers for charging said second accumulator.
Claim 4
Dependent Claim
135 words
An actuating system comprising a fluid actuated, piston and cylinder assembly including a cylinder, a fixed piston mounted in said cylinder and a movable piston mounted on said fixed piston within said cylinder providing a first variable volume chamber defined by said fixed and movable pistons, a second variable volume chamber defined by said movable piston and said cylinder and a third variable volume chamber defined by said movable and fixed pistons and said cylinder; means for selectively supplying fluid under pressure to said first and second variable volume chambers; a first accumulator constituting an energy storage means; a closed hydraulic circuit intercommunicating said third chamber and said accumulator; a second accumulator; and means responsive to a sudden decompression of the fluid in said first and second variable volume chambers for charging said second accumulator.
Claim 5
Dependent Claim
28 words
An actuating assembly according to claim 2 including means for communicating said second accumulator selectively with one of said first and second variable volume chambers under predetermined conditions.
Claim 6
Dependent Claim
30 words
An actuating system according to claim 3 wherein said predetermined conditions comprise pressures below a predetermined pressure of the fluid being supplied to said first and second variable volume chambers.
Claim 7
Dependent Claim
223 words
An actuating system comprising a fluid actuated, piston and cylinder assembly including a cylinder, a fixed piston mounted in said cylinder and a movable piston mounted on said fixed piston within said cylinder providing a first variable volume chamber defined by said fixed and movable pistons, a second variable volume chamber defined by said movable piston and said cylinder and a third variable volume chamber defined by said movable and fixed pistons and said cylinder; means for selectively supplying fluid under pressure to said first and second variable volume chambers, said selective means including a bi-directional, variable displacement pump and fluid supply lines operatively interconnecting said pump and said first and second chambers; a first accumulator constituting an energy storage means; a closed hydraulic circuit intercommunicating said third chamber and said accumulator; means for replenishing fluid in said fluid supply lines including an auxiliary pump having an input communicating with a fluid reservoir and an output communicable with either or both of said fluid supply lines responsive to a predetermined pressure in said fluid supply lines and a second accumulator communicating with the output of said auxiliary pump and communicable with said fluid supply lines responsive to a predetermined pressure; and means responsive to a sudden decompression of the fluid in said first and second variable volume chambers for charging said second accumulator.
Claim 8
Dependent Claim
223 words
An actuating system comprising a fluid actuated, piston and cylinder assembly including a cylinder, a fixed piston mounted in said cylinder and a movable piston mounted on said fixed piston within said cylinder providing a first variable volume chamber defined by said fixed and movable pistons, a second variable volume chamber defined by said movable piston and said cylinder and a third variable volume chamber defined by said movable and fixed pistons and said cylinder; means for selectively supplying fluid under pressure to said first and second variable volume chambers, said selective means including a bi-directional, variable displacement pump and fluid supply lines operatively interconnecting said pump and said first and second chambers; a first accumulator constituting an energy storage means; a closed hydraulic circuit intercommunicating said third chamber and said accumulator; means for replenishing fluid in said fluid supply lines including an auxiliary pump having an input communicating with a fluid reservoir and an output communicable with either or both of said fluid supply lines responsive to a predetermined pressure in said fluid supply lines and a second accumulator communicating with the output of said auxiliary pump and communicable with said fluid supply lines responsive to a predetermined pressure; and means responsive to a sudden decompression of the fluid in said first and second variable volume chambers for charging said second accumulator.
Claim 9
Dependent Claim
125 words
An energy regeneration system for an apparatus having a working component operated by a fluid actuated piston and cylinder assembly comprising a hydro-pneumatic accumulator constituting an energy storage means, means for applying a force produced by said energy storing means to a selected component of said apparatus, and means responsive to a sudden decompression of the fluid in said piston and cylinder assembly for charging said hydro-pneumatic accumulator with the means including a relief valve communicable with the fluid chambers of said piston and cylinder assembly and operative to open responsive to a pressure in excess of a predetermined pressure of the fluid in said fluid chambers and a fluid line intercommunicating said relief valve and said accumulator, said fluid line including a check valve.
Claim 10
Dependent Claim
125 words
An energy regeneration system for an apparatus having a working component operated by a fluid actuated piston and cylinder assembly comprising a hydro-pneumatic accumulator constituting an energy storage means, means for applying a force produced by said energy storing means to a selected component of said apparatus, and means responsive to a sudden decompression of the fluid in said piston and cylinder assembly for charging said hydro-pneumatic accumulator with the means including a relief valve communicable with the fluid chambers of said piston and cylinder assembly and operative to open responsive to a pressure in excess of a predetermined pressure of the fluid in said fluid chambers and a fluid line intercommunicating said relief valve and said accumulator, said fluid line including a check valve.
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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |