US4066004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillatory electro-hydraulic system
Assignee: Case LLC
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Filing: 1976-07-06
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Granted: 1978-01-03
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Expires: 1996-07-06
Abstract
Abstract An oscillatory electro-hydraulic system for a material handling bucket and including two hydraulic cylinder assemblies connectable with the bucket for tipping the bucket, and including a hydraulic pump and control valve and pressure relief valve and a reducing valve, all for directing flow to the respective cylinder assemblies. An electric system is interconnected with the assemblies and with one of the control valves, for controlling the flow of fluid to one of the two cylinder assemblies.
Inventors
- 👤 Joseph Alcalay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:56
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; E02F3/422; E02F9/00; E02F9/20; E02F9/22; E02F9/2203
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
330 words
An oscillatory electro-hydraulic system for a material handling bucket, comprising two hydraulic cylinder assemblies connected with said bucket to be mechanically connected relative to each other for pivoting said bucket, said cylinder assemblies being the double acting type and each including a cylinder portion and a rod extendable from the cylinder portion of each of said assemblies, a hydraulic pump hydraulically connected in separate respective connections to the head and rod ends of a first one of said cylinder assemblies, a hydraulic line hydraulically connected between said cylinder assemblies, a hydraulic control valve connected with said hydraulic line and having two pairs of hydraulic passageways with each pair thereof having one of said passageways separately selectively hydraulically connectable to one of the head and rod ends of the second one of said cylinder assemblies, for controlling hydraulic flow to the respective head and rod ends of said second one of said cylinder assemblies, and the other of said passageways in each of said pairs being a hydraulic return passageway, all for permitting hydraulic pressurizing and actuation of said first one of said cylinder assemblies while said second one of said cylinder assemblies is free to actuate without hydraulic pressure, an electric system operatively associated with both said control valve and one of said cylinder assemblies for operating said control valve, electric switch means included in said electric system and being arranged to be actuated in response to extension and contraction of said one of said cylinder assemblies to thereby actuate said control valve to direct hydraulic flow to and from the head and rod ends of said second cylinder assembly, and a second switch included in said electric system and being arranged to be actuated in response to extension and contraction of said one of said cylinder assemblies for electrically opening said electric system and leaving said control valve in an operative position where only one of said head and rod ends of said second cylinder assembly is hydraulically pressurized.
Claim 2
Dependent Claim
330 words
An oscillatory electro-hydraulic system for a material handling bucket, comprising two hydraulic cylinder assemblies connected with said bucket to be mechanically connected relative to each other for pivoting said bucket, said cylinder assemblies being the double acting type and each including a cylinder portion and a rod extendable from the cylinder portion of each of said assemblies, a hydraulic pump hydraulically connected in separate respective connections to the head and rod ends of a first one of said cylinder assemblies, a hydraulic line hydraulically connected between said cylinder assemblies, a hydraulic control valve connected with said hydraulic line and having two pairs of hydraulic passageways with each pair thereof having one of said passageways separately selectively hydraulically connectable to one of the head and rod ends of the second one of said cylinder assemblies, for controlling hydraulic flow to the respective head and rod ends of said second one of said cylinder assemblies, and the other of said passageways in each of said pairs being a hydraulic return passageway, all for permitting hydraulic pressurizing and actuation of said first one of said cylinder assemblies while said second one of said cylinder assemblies is free to actuate without hydraulic pressure, an electric system operatively associated with both said control valve and one of said cylinder assemblies for operating said control valve, electric switch means included in said electric system and being arranged to be actuated in response to extension and contraction of said one of said cylinder assemblies to thereby actuate said control valve to direct hydraulic flow to and from the head and rod ends of said second cylinder assembly, and a second switch included in said electric system and being arranged to be actuated in response to extension and contraction of said one of said cylinder assemblies for electrically opening said electric system and leaving said control valve in an operative position where only one of said head and rod ends of said second cylinder assembly is hydraulically pressurized.
Claim 3
Dependent Claim
50 words
The oscillatory electro-hydraulic system as claimed in claim 1, including a hydraulic pressure actuated valve connected with said hydraulic line for controlling hydraulic flow to said second cylinder assembly and permitting the flow to said second cylinder assembly only after said one cylinder assembly is hydraulically pressurized by said pump.
Claim 4
Dependent Claim
29 words
The oscillatory electro-hydraulic system as claimed in claim 2, wherein said pressure actuated valve is a pressure relief valve arranged to present hydraulic pressure to said second cylinder assembly.
Claim 5
Dependent Claim
48 words
The oscillatory electro-hydraulic system as claimed in claim 3, including a pressure reducing valve connected with said hydraulic line and in a series connection with said pressure relief valve and said one cylinder assembly, for limiting the magnitude of the hydraulic pressure presented to said one cylinder assembly.
Claim 6
Dependent Claim
51 words
The oscillator electro-hydraulic system as claimed in claim 4, wherein said reducing valve is of a pressure responsive value less than that of said relief valve, to have said reducing valve actuate before said relief valve is actuated, and thereby actuate said one cylinder assembly before actuating said second cylinder assembly.
Claim 7
Dependent Claim
37 words
The oscillatory electro-hydraulic system as claimed in claim 1, including an additional hydraulic control valve hydraulically connected between said pump and said first one of said cylinder assemblies for two-way flow of hydraulic fluid to the latter.
Claim 8
Dependent Claim
53 words
The oscillatory electro-hydraulic system as claimed in claim 6, wherein said hydraulic line connecting said cylinder assemblies is connected, and said control valve passageways are arranged, to normally have the head end of one of said two cylinder assemblies hydraulically connected to the rod end of the other of said two cylinder assemblies.
Claim 9
Dependent Claim
64 words
The oscillatory electro-hydraulic system as claimed in claim 1, wherein said hydraulic line is only a single hydraulic passageway extending between only one of said head and rod ends of said one cylinder assembly and said control valve, whereby said second cylinder assembly is hydraulically pressurized only in the event said one of said head and rod ends of said cylinder assembly is pressurized.
Claim 10
Dependent Claim
71 words
The oscillatory electro-hydraulic system as claimed in claim 8, including a hydraulic pressure activated reducing valve connected intermediate said pump and said one cylinder assembly, for limiting hydraulic pressure to said one cylinder assembly, and said hydraulic line being hydraulically connected between said reducing valve and said control valve, for directing hydraulic pressure to said second cylinder assembly only after the hydraulic pressure reaches the activation magnitude on said reducing valve.
Claim 11
Dependent Claim
45 words
The oscillatory electro-hydraulic system as claimed in claim 1, wherein said electric switch means includes two electric switches sequentially disposed in the path of movement of said one of said cylinder assemblies with which said switch means is operatively associated, for sequencing said control valve.
Claim 12
Dependent Claim
66 words
The oscillatory electro-hydraulic system as claimed in claim 1, wherein said control valve is a solenoid type of valve for actuating said control valve for controlling the fluid flow therethrough, and said electric switch means is operatively connected to the solenoid of said control valve and is disposed to be physically actuated in accordance with the extension and contraction of said one of said cylinder assemblies.
Claim 13
Dependent Claim
102 words
The oscillatory electro-hydraulic system as claimed in claim 1, wherein said electric switch means includes two electric switches sequentially disposed in the path of movement of said one of said cylinder assemblies with which said switch means is operatively associated, for sequencing said control valve, and said control valve is a solenoid type of valve for actuating said control valve for controlling the fluid flow therethrough, and said electric switch means is operatively connected to the solenoid of said control valve and is disposed to be physically actuated in accordance with the extension and contraction of said one of said cylinder assemblies.
Claim 14
Dependent Claim
52 words
The oscillatory electro-hydraulic system as claimed in claim 12, wherein said electric system includes electric control relays electrically connected with said switch means and capable of remaining electrically open and closed for respectively positioning said switch means electrically open and closed to provide a time interval for operation of said control 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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |