US4159671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-advancing mine roof supports
Assignee: Individual
•
Filing: 1977-12-02
•
Granted: 1979-07-03
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Expires: 1997-12-02
Abstract
Abstract A self-advancing mine roof support is provided, in addition to the normal manually operable control valve means for controlling raising and lowering of the roof-engaging structure of the support and operation of the advancing means, with an automatic sequence control valve means operable in response to a control signal from a position removed from the support, for example from an adjacent support, and an isolating valve means arranged so that control of the various operations can be effected either by means of the manually operable means or from the safety of a location spaced away from the support being controlled by means of the automatic valve means each independently of the other.
Inventors
- 👤 Archelaius D. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:42
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/16; E21D23/26; E21D23/12; E21D23/14; E21D23/148
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
A self-advancing mine roof support system which comprises a plurality of mine roof supports arranged side-by-side and means for passing an automatic sequencing control signal between adjacent supports; each of said supports including manually operable control valve means, an automatic sequence control valve means operable in response to said control signal passed thereto, each of said manually operable and automatic sequence control valve means providing for controlling the operations of the support, isolating valve means arranged so that either one of said manually operable control valve means and said automatic sequence control valve means can effect operation of said support independently of the other, and a manually operable signal generator means operable independently of either of said control valve means and arranged to apply an output signal to the automatic sequence control valve means of a next adjacent support to permit selective control of that next adjacent support through an automatic advance sequence thereof.
Claim 2
Dependent Claim
154 words
A self-advancing mine roof support system which comprises a plurality of mine roof supports arranged side-by-side and means for passing an automatic sequencing control signal between adjacent supports; each of said supports including manually operable control valve means, an automatic sequence control valve means operable in response to said control signal passed thereto, each of said manually operable and automatic sequence control valve means providing for controlling the operations of the support, isolating valve means arranged so that either one of said manually operable control valve means and said automatic sequence control valve means can effect operation of said support independently of the other, and a manually operable signal generator means operable independently of either of said control valve means and arranged to apply an output signal to the automatic sequence control valve means of a next adjacent support to permit selective control of that next adjacent support through an automatic advance sequence thereof.
Claim 3
Dependent Claim
63 words
A self-advancing mine roof support system as claimed in claim 1 wherein each of said supports includes hydraulic operating circuitry and wherein said isolating valve means responds to the operation of one of said control valve means to connect said one control valve means with said hydraulic operating circuitry of said support and to isolate the remaining control valve means from said circuitry.
Claim 4
Dependent Claim
58 words
A self-advancing mine roof support system as claimed in claim 1 wherein said automatic sequence control valve means includes means for controlling the lowering and advancing operations of said support, and means for resetting said support after advancing is effected automatically in response to the completion of the advancing operation independently of said automatic sequence control valve means.
Claim 5
Dependent Claim
67 words
A system as claimed in claim 1 wherein the manually operable control signal generator of at least one of said supports is selectively operable to apply control signals to the automatic sequence control valve means of the support positioned on either side thereof whereby its advance can be controlled stepwise from said support itself and in an automatic sequence from the support positioned on either side thereof.
Claim 6
Dependent Claim
64 words
A system as claimed in claim 1 wherein means are provided for applying a control signal to the automatic sequence control valve means of at least one support from a next adjacent support upon completion of an automatic advancing sequence by said next adjacent support whereby automatic advance of said at least one support automatically follows the automatic advance of said next adjacent support.
Claim 7
Dependent Claim
25 words
A mine roof support system as claimed in claim 1 wherein said automatic sequence control valve means are adapted to respond to hydraulic control signals.
Claim 8
Dependent Claim
51 words
The self-advancing mine roof support system as set forth in claim 1, wherein said manually operable control signal generator means includes control signal initiating means normally biased to a neutral state but manually actuable to either of two signal generation states each of which relates to a different but adjacent support.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-02 | 1983-01-01 | 1983-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-02 | 1987-01-01 | 1987-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-02 | 1991-01-01 | 1991-07-03 | $7700.00 | Window Closed / Lapsed |