US3828435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Geological movement detectors
Assignee: LINEAR DEVICES Inc
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Filing: 1971-12-20
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Granted: 1974-08-13
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Expires: 1991-12-20
Abstract
Abstract A device for determining very minute movement, as well as relatively large movement, of a material such as rock in a mine. An anchor is secured to one part of the material, and another anchor is secured to a separated part of the material. A pair of movable elements are secured separately to the two anchors. One part of a transducer, as for example, in one embodiment, illustrated a carbon resistance bar of a variable resistance, is secured to one of the movable elements; and another part of the transducer, as for example in the same embodiment the wiper arm of the variable resistance, is secured to the other movable element. Thus, when one anchor moves relative to the other anchor, the resistance is varied. This is one type of linear transducer. In other types shown, an inductance or a capacitance is substituted for the variable resistance. There is also provided an electrical circuit including a source or supply of electric power, the transducer, and a read-out device. The read-out device is shown herein as an ammeter.
Inventors
- 👤 D Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:09
CPC Classifications
E; E21; E21F; E21F17/00; E21F17/18; E21F17/185; G; G01; G01B; G01B7/00; G01B7/16; G01B2210/00; G01B2210/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
330 words
A device for determining very minute movement as well as very large movement of a material such as rock in a mine comprising an anchor fixed to one part of the material; an anchor fixed to a separated part of the material; an elongated movable element secured to one of the anchors; a movable element secured to the other anchor; electrical transducer means having two relatively movable parts for controlling a current flow, one of said movable parts being connected to said elongated element and the other movable part being connected to the other movable element; and an electrical circuit means connected electrically to said electrical transducer means and including a source of electrical power, and a read-out device, said electrical transducer means controlling the amount of current flow through the read-out device in which the electrical means for controlling the amount of current flow is a variable resistance; in which there is provided a plurality of fixed resistances and an electrical switch by which at least any one of said fixed resistances may be included in said electrical circuit; in which the variable resistor is part of a wheatstone bridge and in which there are provided a plurality of additional resistors each having a different resistance, and a switch by which any one of said additional resistors may be connected in series with said variable resistance; in which the read-out device is an ammeter; in which one of the movable elements is a rod adjustably secured by means of a setscrew to a sleeve through which it passes and the sleeve is connected to one movable part of the electrical means for controlling the amount of current flow; and in which the rod is secured to a carbon resistance bar and the other movable element is secured to a wiper arm which is movable over the surface of the carbon resistance bar, the resistance bar and the wiper arm comprising the means for controlling the amount of current flow.
Claim 2
Independent Claim
330 words
A device for determining very minute movement as well as very large movement of a material such as rock in a mine comprising an anchor fixed to one part of the material; an anchor fixed to a separated part of the material; an elongated movable element secured to one of the anchors; a movable element secured to the other anchor; electrical transducer means having two relatively movable parts for controlling a current flow, one of said movable parts being connected to said elongated element and the other movable part being connected to the other movable element; and an electrical circuit means connected electrically to said electrical transducer means and including a source of electrical power, and a read-out device, said electrical transducer means controlling the amount of current flow through the read-out device in which the electrical means for controlling the amount of current flow is a variable resistance; in which there is provided a plurality of fixed resistances and an electrical switch by which at least any one of said fixed resistances may be included in said electrical circuit; in which the variable resistor is part of a wheatstone bridge and in which there are provided a plurality of additional resistors each having a different resistance, and a switch by which any one of said additional resistors may be connected in series with said variable resistance; in which the read-out device is an ammeter; in which one of the movable elements is a rod adjustably secured by means of a setscrew to a sleeve through which it passes and the sleeve is connected to one movable part of the electrical means for controlling the amount of current flow; and in which the rod is secured to a carbon resistance bar and the other movable element is secured to a wiper arm which is movable over the surface of the carbon resistance bar, the resistance bar and the wiper arm comprising the means for controlling the amount of current flow.
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |