US3670826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for drills
Assignee: Gardner Denver Inc
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Filing: 1970-09-11
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Granted: 1972-06-20
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Expires: 1990-09-11
Abstract
Abstract An automatic control system for a guide shell mounted rock drill including a control circuit having pneumatically operated valves for providing pressure fluid to the drill hammer, rotation motor and feed motor and for controlling drill hole flushing medium. Sensors mounted on the drill guide shell provide for reversal of the feed motor and reduced drill power upon reaching the forward end of the guide shell, and shutdown of the drill upon reaching the rearward end of the guide shell. The control circuit includes a series of control valves for selection, at will, by the drill operator of a particular operating sequence or condition of the drill. A control valve is included for providing an operating sequence which includes operation of the drill at reduced power for a predetermined period of time for collaring a drill hole. The control system also includes pressure proportioning valves for automatically regulating the feed motor pressure to be proportional to the drill percussion motor supply pressure.
Inventors
- 👤 Laurence B Hanson
- 👤 Wallace W Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:59
CPC Classifications
E; E21; E21B; E21B6/00; E21B44/00; E21B44/02; E21B44/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
294 words
Improved rock drilling means comprising: an elongated support; a pressure fluid operated rock drill slidably mounted on said support and having a percussion motor operable to actuate a drill steel; a fluid operated feed motor mounted on said support operable to feed said drill reversibly therealong; a source of pressure fluid; a supply means in communication with said cource and said drill for supplying pressure fluid to operAte said percussion motor; conduit means in communication with said source and said feed motor for supplying pressure fluid to feed said drill along said support, and the improvement comprising: pressure regulator means comprising a valve interposed in said conduit means and including a closure member for throttling the flow of pressure fluid supplied to said feed motor to maintain a reduced pressure proportional to the pressure of said fluid supplied to said percussion motor, said closure member including a first pressure surface operable to be acted on by fluid at supply pressure to open said valve, a second pressure surface operable to be acted on by fluid at supply pressure to close said valve, and a third pressure surface operable to be acted on by pressure fluid at the pressure reduced by said valve to close said valve, and said valve including biasing means comprising piston means connected to said closure member and slidably housed in a bore forming a pressure chamber, passage means in communication with said bore for supplying pressure fluid thereto, and a valve in communication with said bore for controlling the pressure of said fluid in said chamber to vary the proportionality of said reduced pressure to said supply pressure, and said piston means is operable in response to pressure fluid acting thereon to bias said closure member to the closed position.
Claim 2
Dependent Claim
294 words
Improved rock drilling means comprising: an elongated support; a pressure fluid operated rock drill slidably mounted on said support and having a percussion motor operable to actuate a drill steel; a fluid operated feed motor mounted on said support operable to feed said drill reversibly therealong; a source of pressure fluid; a supply means in communication with said cource and said drill for supplying pressure fluid to operAte said percussion motor; conduit means in communication with said source and said feed motor for supplying pressure fluid to feed said drill along said support, and the improvement comprising: pressure regulator means comprising a valve interposed in said conduit means and including a closure member for throttling the flow of pressure fluid supplied to said feed motor to maintain a reduced pressure proportional to the pressure of said fluid supplied to said percussion motor, said closure member including a first pressure surface operable to be acted on by fluid at supply pressure to open said valve, a second pressure surface operable to be acted on by fluid at supply pressure to close said valve, and a third pressure surface operable to be acted on by pressure fluid at the pressure reduced by said valve to close said valve, and said valve including biasing means comprising piston means connected to said closure member and slidably housed in a bore forming a pressure chamber, passage means in communication with said bore for supplying pressure fluid thereto, and a valve in communication with said bore for controlling the pressure of said fluid in said chamber to vary the proportionality of said reduced pressure to said supply pressure, and said piston means is operable in response to pressure fluid acting thereon to bias said closure member to the closed position.
Claim 3
Dependent Claim
201 words
Improved rock drilling means comprising: an elongated support; a pressure fluid operated rock drill slidably mounted on said support and having a percussion motor operable to actuate a drill steel; a fluid operated feed motor mounted on said support operable to feed said drill reversibly therealong; a source of pressure fluid; supply means in communication with said source and said drill for supplying pressure fluid to operate said percussion motor; conduit means in communication with said source and said feed motor for supplying pressure fluid to feed said drill along said support, and the improvement comprising: pressure regulator means comprising a valve interposed in said conduit means for throttling the flow of pressure fluid supplied to said feed motor to a reduced pressure proportional to the pressure of said fluid supplied to said percussion motor, said valve including a closure member having a first pressure surface operable to be acted on by fluid at supply pressure to open said valve, a second pressure surface operable to be acted on by fluid at supply pressure to close said valve, and a third pressure surface operable to be acted on by fluid at the pressure reduced by said valve to close said valve.
Claim 4
Dependent Claim
201 words
Improved rock drilling means comprising: an elongated support; a pressure fluid operated rock drill slidably mounted on said support and having a percussion motor operable to actuate a drill steel; a fluid operated feed motor mounted on said support operable to feed said drill reversibly therealong; a source of pressure fluid; supply means in communication with said source and said drill for supplying pressure fluid to operate said percussion motor; conduit means in communication with said source and said feed motor for supplying pressure fluid to feed said drill along said support, and the improvement comprising: pressure regulator means comprising a valve interposed in said conduit means for throttling the flow of pressure fluid supplied to said feed motor to a reduced pressure proportional to the pressure of said fluid supplied to said percussion motor, said valve including a closure member having a first pressure surface operable to be acted on by fluid at supply pressure to open said valve, a second pressure surface operable to be acted on by fluid at supply pressure to close said valve, and a third pressure surface operable to be acted on by fluid at the pressure reduced by said valve to close said valve.
Claim 5
Dependent Claim
57 words
The invention set forth in claim 2 wherein: said second pressure surface and said third pressure surface on said closure member have areas proportional to the area of said first pressure surface whereby the pressure of said fluid reduced by said regulator valve is a fixed percentage of the pressure of said fluid supplied to said valve.
Claim 6
Dependent Claim
198 words
Improved rock drilling means comprising: an elongated support; a pressure fluid operated rock drill slidably mounted on said support and having a percussion motor operable to actuate a drill steel; a fluid operated feed motor mounted on said support operable to feed said drill reversibly therealong; a source of pressure fluid; supply means comprising a first fluid circuit in communication with said source and said drill for supplying pressure fluid to said percussion motor at reduced pressure forcollaring a hole; a second fluid circuit in communication with said source and said drill for supplying pressure fluid to said percussion motor at substantially supply pressure; and, pressure regulating means comprising a first pressure regulating valve in communication with said first fluid circuit and said feed motor and operable to automatically supply pressure fluid to said feed motor at a pressure proportional to said pressure fluid supplied to said percussion motor at said reduced Pressure, and a second pressure regulating valve in communication with said second fluid circuit and said feed motor and operable to automatically supply pressure fluid to said feed motor at a pressure proportional to said pressure fluid supplied to said percussion motor at substantially supply pressure.
Claim 7
Dependent Claim
198 words
Improved rock drilling means comprising: an elongated support; a pressure fluid operated rock drill slidably mounted on said support and having a percussion motor operable to actuate a drill steel; a fluid operated feed motor mounted on said support operable to feed said drill reversibly therealong; a source of pressure fluid; supply means comprising a first fluid circuit in communication with said source and said drill for supplying pressure fluid to said percussion motor at reduced pressure forcollaring a hole; a second fluid circuit in communication with said source and said drill for supplying pressure fluid to said percussion motor at substantially supply pressure; and, pressure regulating means comprising a first pressure regulating valve in communication with said first fluid circuit and said feed motor and operable to automatically supply pressure fluid to said feed motor at a pressure proportional to said pressure fluid supplied to said percussion motor at said reduced Pressure, and a second pressure regulating valve in communication with said second fluid circuit and said feed motor and operable to automatically supply pressure fluid to said feed motor at a pressure proportional to said pressure fluid supplied to said percussion motor at substantially supply pressure.
References Cited (Backward Citations)
US2125287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |