Patent US3843095A successfully refreshed from Google Patents.
US3843095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic crowd cable take-up system
Assignee: Caterpillar Global Mining LLC
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Filing: 1971-12-22
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Granted: 1974-10-22
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Expires: 1991-12-22
Abstract
Abstract A hydraulic crowd cable take-up system for the crowd mechanism of an excavator shovel includes a hydraulic actuator that urges a cable support means against the crowd cable. In a first embodiment operating fluid is supplied to the blind end of the actuator via a stop valve that is automatically or manually activated to control the take-up of the cable automatically. In a second embodiment operating fluid is also supplied to the rod end of the actuator.
Inventors
- 👤 R Rupert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:02
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; E02F3/427; E02F3/30; E02F3/308; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18832; Y10T74/18848
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
185 words
In a crowd mechanism of an excavator of the type that utilizes a crowd cable about sheaves to act upon a handle and having at least one sheave on a linearly adjustable mounting for taking-up slack in said crowd cable, the combination with said one sheave of a single acting linear hydraulic actuator mounted between an excavator structure and said linearly adjustable mounting of said sheave to linearly adjust said sheave and having a cylinder bore with a blind end and a rod end, a piston reciprobably mounted in said cylinder bore with a piston rod projecting from said rod end of said cylinder; a reservoir of operating fluid connected to a source of pressurized air to maintain said operating fluid under pressure; a slack take-up stop valve connected by conduit between said operating fluid under pressure and said blind end of said cylinder bore, said slack take-up stop valve being normally closed; and a controller for opening and closing said slack takeup stop valve at predetermined times to connect and disconnect said blind end of said cylinder bore with said operating fluid under pressure.
Claim 2
Dependent Claim
185 words
In a crowd mechanism of an excavator of the type that utilizes a crowd cable about sheaves to act upon a handle and having at least one sheave on a linearly adjustable mounting for taking-up slack in said crowd cable, the combination with said one sheave of a single acting linear hydraulic actuator mounted between an excavator structure and said linearly adjustable mounting of said sheave to linearly adjust said sheave and having a cylinder bore with a blind end and a rod end, a piston reciprobably mounted in said cylinder bore with a piston rod projecting from said rod end of said cylinder; a reservoir of operating fluid connected to a source of pressurized air to maintain said operating fluid under pressure; a slack take-up stop valve connected by conduit between said operating fluid under pressure and said blind end of said cylinder bore, said slack take-up stop valve being normally closed; and a controller for opening and closing said slack takeup stop valve at predetermined times to connect and disconnect said blind end of said cylinder bore with said operating fluid under pressure.
Claim 3
Dependent Claim
90 words
The combination as set forth in claim 1 wherein a check valve is connected between said slack take-up stop valve and said blind enD of said cylinder bore and is oriented to permit said operating fluid to flow only from said slack takeup stop valve to said blind end of said cylinder bore; and a drain stop valve is connected by conduit between said reservoir and said blind end of said cylinder bore in parallel with said slack take-up stop valve, and said drain stop valve is also normally closed.
Claim 4
Dependent Claim
37 words
The combination as set forth in claim 2 wherein said controller for said slack take-up stop valve is a solenoid connected to a power source by a limit switch and a manually operated switch connected in parallel.
Claim 5
Dependent Claim
29 words
The combination as set forth in claim 2 wherein said rod end of said cylinder bore is connected by a conduit to said fluid under pressure in said reservoir.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |