Patent US3786511A successfully refreshed from Google Patents.
US3786511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording apparatus
Assignee: Coal Industry Patents Ltd
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Filing: 1973-05-03
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Granted: 1974-01-15
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Expires: 1993-05-03
Abstract
Abstract The recorder comprises a hydraulic pressure recorder section and a mechanical movement detector section which enable the recorder simultaneously to monitor the hydraulic pressure in mine roof support system and the roof convergence. The hydraulic pressure recorder section comprises a coiled, hollow Bourdon tube gauge interconnected to an arm which carries a chart marking pen. The mechanical movement detector section comprises a spring loaded drum assembly which is rotated by a Bowden cable secured at its other end to two relatively movable members of the roof support, the members being moved relative to one another upon convergence of the mine roof. Rotation of the spring loaded drum assembly moves a further arm which carries a further chart marking pen.
Inventors
- 👤 G Smith
- 👤 J Bates
- 👤 E Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:46
CPC Classifications
E; E21; E21F; E21F17/00; E21F17/18; E21F17/185; E21D; E21D15/00; E21D15/14; E21D15/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
Recording apparatus comprising a housing, detector means sensitive to hydraulic pressure, hydraulic connector means for connecting the detector means to a source of hydraulic pressure, an arm connected to the detector means and movable in response to movement of the detector means, marker means provided on the arm for marking moving-chart means, a spring loaded drum assembly, a Bowden cable connected at one end to the houSing and to the spring loaded drum and being adapted at the other end for attachment to two relatively movable members, a mechanism interconnecting the spring loaded drum assembly to a further arm movable in response to rotation of the drum, and further marker means provided on the said further arm for marking the said moving-chart means.
Claim 2
Dependent Claim
123 words
Recording apparatus comprising a housing, detector means sensitive to hydraulic pressure, hydraulic connector means for connecting the detector means to a source of hydraulic pressure, an arm connected to the detector means and movable in response to movement of the detector means, marker means provided on the arm for marking moving-chart means, a spring loaded drum assembly, a Bowden cable connected at one end to the houSing and to the spring loaded drum and being adapted at the other end for attachment to two relatively movable members, a mechanism interconnecting the spring loaded drum assembly to a further arm movable in response to rotation of the drum, and further marker means provided on the said further arm for marking the said moving-chart means.
Claim 3
Dependent Claim
29 words
Recording apparatus as claimed in claim 1, in which the said mechanism comprises gears and a gearbox and a stop to limit the amount of rotation of the gears.
Claim 4
Dependent Claim
31 words
Recording apparatus as claimed in claim 2, in which the spring loaded drUm assembly comprises a rotatable drum with a helical grove for accommodating the associated part of the Bowden cable.
Claim 5
Dependent Claim
150 words
Recording apparatus comprising a housing, detector means sensitive to hydraulic pressure, hydraulic connector means for connecting the detector means to a source of hydraulic pressure, an arm connected to the detector means and movable in response to movement of the detector means, a spring loaded drum assembly, a Bowden cable connected at one end to the housing and to the spring loaded drum and being adapted at the other end for attachment to two relatively movable members, a mechanism interconnecting the spring loaded drum assembly to a further arm movable in response to rotation of the drum, further marker means provided on the said further arm for marking the said moving-chart means, abutment means provided on the housing, and spring loaded clip means provided on each of the said arms and arranged to locate on the said abutment means when the associated marker means is disengaged from the moving-chart means.
Claim 6
Dependent Claim
150 words
Recording apparatus comprising a housing, detector means sensitive to hydraulic pressure, hydraulic connector means for connecting the detector means to a source of hydraulic pressure, an arm connected to the detector means and movable in response to movement of the detector means, a spring loaded drum assembly, a Bowden cable connected at one end to the housing and to the spring loaded drum and being adapted at the other end for attachment to two relatively movable members, a mechanism interconnecting the spring loaded drum assembly to a further arm movable in response to rotation of the drum, further marker means provided on the said further arm for marking the said moving-chart means, abutment means provided on the housing, and spring loaded clip means provided on each of the said arms and arranged to locate on the said abutment means when the associated marker means is disengaged from the moving-chart means.
Claim 7
Dependent Claim
40 words
Recording apparatus as claimed in claim 4, in which the said arms are pivotally mounted and the said abutment means are curved to facilitate location by the associated clip means irrespective of the marker means position across the moving-chart means.
Claim 8
Dependent Claim
41 words
Recording apparatus as claimed in claim 5, in which the said marker means and the said further marker means comprise pens which are pivotally mounted on the associated arm to facilitate adjustment of the pen tip relative to the associated arm.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |