Patent US3594773A successfully refreshed from Google Patents.
US3594773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof gauge and indicator
Assignee: Individual
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Filing: 1968-11-12
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Granted: 1971-07-20
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Expires: 1988-11-12
Abstract
Abstract Two telescoping sleeves are dispose between the roof and floor of a mine. Switch trigger means is secured to a first sleeve and a detector actuator is secured to the second sleeve. The trigger and the detector actuator are positioned in registry with one another and separated by a predetermined distance. Displacement of a mine roof by a distance exceeding the predetermined space between the trigger and actuator causes operation of an alarm circuit thus signaling the occurrence of an emergency situation. A second embodiment utilizes the telescoping sleeves and a displacement gauge mounted thereto for monitoring roof displacement.
Inventors
- 👤 Ellsworth V Conkle
- 👤 Charles E Bear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:11
CPC Classifications
E; E21; E21F; E21F17/00; E21F17/18; E21F17/185; E21D; E21D15/00; E21D15/14; E21D15/46
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
223 words
An apparatus for detecting a dropping roof condition comprising trigger means coupled to a ceiling, a detector actuator coupled to an oppositely disposed floor surface, the trigger means and the actuator being normally retained in preselected spaced registry, the trigger means causing operation of the actuator after relative displacement of the surfaces results in the closing of the space between the actuator and the trigger means, and means for indicating the occurrence of actuator operation, together with first and second telescoping sleeve sections retained in contacting engagement between confronting ceiling and roof surfaces, the trigger means being mounted to the first sleevE section, the detector actuator being mounted to the second sleeve section to that relative displacement between the first and second sleeve sections results in a commensurate displacement between the trigger means and the detector actuator, wherein the trigger means includes mounting means connected to the first sleeve section, and an adjustable screw threadedly engaged within the mounting means for registry with the detector actuator, the screw having gradation marks thereon to be aligned with a fixed reference mark on the mounting means, turning of the screw between adjacent gradation marks causing a corresponding displacement of the screw with respect to the detector actuator thereby enabling one to preset the distance that the ceiling must drop before the detector actuator becomes operative.
Claim 2
Independent Claim
223 words
An apparatus for detecting a dropping roof condition comprising trigger means coupled to a ceiling, a detector actuator coupled to an oppositely disposed floor surface, the trigger means and the actuator being normally retained in preselected spaced registry, the trigger means causing operation of the actuator after relative displacement of the surfaces results in the closing of the space between the actuator and the trigger means, and means for indicating the occurrence of actuator operation, together with first and second telescoping sleeve sections retained in contacting engagement between confronting ceiling and roof surfaces, the trigger means being mounted to the first sleevE section, the detector actuator being mounted to the second sleeve section to that relative displacement between the first and second sleeve sections results in a commensurate displacement between the trigger means and the detector actuator, wherein the trigger means includes mounting means connected to the first sleeve section, and an adjustable screw threadedly engaged within the mounting means for registry with the detector actuator, the screw having gradation marks thereon to be aligned with a fixed reference mark on the mounting means, turning of the screw between adjacent gradation marks causing a corresponding displacement of the screw with respect to the detector actuator thereby enabling one to preset the distance that the ceiling must drop before the detector actuator becomes operative.
Claim 3
Dependent Claim
36 words
The apparatus set forth in claim 1 together with a displacement gauge connected between sleeve sections and responding to actuating forces imparted by the trigger means, the gauge permitting continuous monitoring of displacement of the roof.
Claim 4
Independent Claim
171 words
An apparatus for detecting a dropping roof condition comprising trigger means coupled to a ceiling, a detector actuator coupled to an oppositely disposed floor surface, first and second telescoping sleeve sections retained in contacting engagement between confronting ceiling and roof surfaces, the trigger means being mounted to the first sleeve section, the detector actuator being mounted to the second sleeve section so that relative displacement between the first and second sleeve sections results in a commensurate displacement between the trigger means and the detector actuator, wherein the trigger means includes mounting means connected to the first sleeve section, and an adjustable screw threadingly engaged within the mounting means for registry with the detector actuator, the screw having gradation marks thereon to be aligned with a fixed reference mark on the mounting means, turning of the screw between adjacent gradation marks causing a corresponding displacement of the screw with respect to the detector actuator thereby enabling one to preset the distance that the ceiling must drop before the detector actuator becomes operative.
Claim 5
Independent Claim
171 words
An apparatus for detecting a dropping roof condition comprising trigger means coupled to a ceiling, a detector actuator coupled to an oppositely disposed floor surface, first and second telescoping sleeve sections retained in contacting engagement between confronting ceiling and roof surfaces, the trigger means being mounted to the first sleeve section, the detector actuator being mounted to the second sleeve section so that relative displacement between the first and second sleeve sections results in a commensurate displacement between the trigger means and the detector actuator, wherein the trigger means includes mounting means connected to the first sleeve section, and an adjustable screw threadingly engaged within the mounting means for registry with the detector actuator, the screw having gradation marks thereon to be aligned with a fixed reference mark on the mounting means, turning of the screw between adjacent gradation marks causing a corresponding displacement of the screw with respect to the detector actuator thereby enabling one to preset the distance that the ceiling must drop before the detector actuator becomes operative.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |