Patent US3854775A successfully refreshed from Google Patents.
US3854775A
Expired / Lapsed
US
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Mineral mining machine steering means
Assignee: Anderson Strathclyde PLC
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Filing: 1973-04-06
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Granted: 1974-12-17
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Expires: 1993-04-06
Abstract
Abstract This invention relates to steering means in a mineral mining machine of the type having cutting elements at each end thereof, said elements being capable of being raised or lowered to cut and form a roof or to cut and form a floor and said cutting elements being either rigidly mounted to the machine body or mounted on ranging arms pivotally mounted to the machine body. The steering means provides for controlling the height of a leading floor mounted support for the machine on the face side of the machine to suit variations in the horizontal and vertical plane of the leading cutting element and thereby maintain the transverse plane of the machine body on a predetermined plane. The steering means includes hydraulic servo control means connected to hydraulic jacks for the support members and adjustable detecting means, responsive to change in the predetermined transverse plane of the machine, operate valve means to actuate the hydraulic jack on the leading support member to maintain the machine body in said predetermined plane.
Inventors
- 👤 F Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:10
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/02; E21C35/00; E21C35/06; E21C35/282; E21C35/302; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0923; Y10T137/0947
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
210 words
A mineral mining machine of the type referred to including steering means comprising hydraulic servo control means in a hydraulic circuit operatively connectible to a hydraulic jack for a leading support member on the face side of the machine, adjustable pendulum means oscillatable about an axis parallel to the longitudinal axis of the machine to detect transverse tilting of the machine from a predetermined position and responsive to said tilting to operate a valve member in the hydraulic circuit to provide a pressure differential, said pressure differential applied to an intensifier, said valve member comprising a pair of nozzles aligned with the open ends of a pair of conduits, said conduits connected to opposite ends of said intensifier, a jet disturbing member operatively connected to said pendulum and interposed between said nozzles and said conduits and movable between one extreme position in which the jet disturbing member cuts-off the supply of hydraulic fluid from one nozzle to its associated conduit to another extreme position in which the supply of hydraulic fluid from the other nozzle to its associated conduit is cut-off, said intensifier comprising a double acting piston to actuate valve means, said valve means operable to actuate said leading hydraulic jack to maintain the machine in said predetermined position.
Claim 2
Dependent Claim
210 words
A mineral mining machine of the type referred to including steering means comprising hydraulic servo control means in a hydraulic circuit operatively connectible to a hydraulic jack for a leading support member on the face side of the machine, adjustable pendulum means oscillatable about an axis parallel to the longitudinal axis of the machine to detect transverse tilting of the machine from a predetermined position and responsive to said tilting to operate a valve member in the hydraulic circuit to provide a pressure differential, said pressure differential applied to an intensifier, said valve member comprising a pair of nozzles aligned with the open ends of a pair of conduits, said conduits connected to opposite ends of said intensifier, a jet disturbing member operatively connected to said pendulum and interposed between said nozzles and said conduits and movable between one extreme position in which the jet disturbing member cuts-off the supply of hydraulic fluid from one nozzle to its associated conduit to another extreme position in which the supply of hydraulic fluid from the other nozzle to its associated conduit is cut-off, said intensifier comprising a double acting piston to actuate valve means, said valve means operable to actuate said leading hydraulic jack to maintain the machine in said predetermined position.
Claim 3
Dependent Claim
43 words
A mineral mining machine according to claim 1 in which the support members on the gob sidE of the machine are rigidly attached to the machine and the cutting elements are each mounted on an adjustable arm at the ends of the machine.
Claim 4
Dependent Claim
91 words
A mineral mining machine according to claim 1 in which the cutting elements at each end of the machine are rigidly mounted to the machine, the support members on the gob side of the machine are each mounted on a vertically slidable guide member, said guide members each actuated by a manually operable hydraulic jack for raising or lowering the support members, and the trailing support member on the face side of the machine is operatively connected to a jack hydraulically coupled in parallel with the gob side trailing support member.
Claim 5
Dependent Claim
177 words
A mineral mining machine of the type referred to including steering means comprising hydraulic servo control means in a hydraulic circuit operatively connectible to a hydraulic jack for a leading support member on the face side of the machine, adjustable pendulum means oscillatable about an axis parallel to the longitudinal axis of the machine to detect transverse tilting of the machine from a predetermined position and responsive to said tilting to operate a valve member in the hydraulic circuit to provide a pressure differential, said pressure differential applied to an intensifier, said valve member comprising a swinging nozzle valve in which an oscillatable nozzle is operatively connected to said pendulum arm to direct a jet of hydraulic fluid in the direction of the open ends of two hydraulic lines arranged in the line of oscillation of the nozzle and each of said hydraulic lines being connected to an opposite side of intensifier, said intensifier operable to actuate valve means, said valve means operable to actuate said leading hydraulic jack to maintain the machine in said predetermined position.
Claim 6
Dependent Claim
177 words
A mineral mining machine of the type referred to including steering means comprising hydraulic servo control means in a hydraulic circuit operatively connectible to a hydraulic jack for a leading support member on the face side of the machine, adjustable pendulum means oscillatable about an axis parallel to the longitudinal axis of the machine to detect transverse tilting of the machine from a predetermined position and responsive to said tilting to operate a valve member in the hydraulic circuit to provide a pressure differential, said pressure differential applied to an intensifier, said valve member comprising a swinging nozzle valve in which an oscillatable nozzle is operatively connected to said pendulum arm to direct a jet of hydraulic fluid in the direction of the open ends of two hydraulic lines arranged in the line of oscillation of the nozzle and each of said hydraulic lines being connected to an opposite side of intensifier, said intensifier operable to actuate valve means, said valve means operable to actuate said leading hydraulic jack to maintain the machine in said predetermined position.
References Cited (Backward Citations)
US2971499A
Cited
US3397915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |