US3669197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for rock drills
Assignee: Gardner Denver Inc
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Filing: 1970-09-11
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Granted: 1972-06-13
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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
2026-11-05 06:43
CPC Classifications
E; E21; E21B; E21B44/00; E21B44/02; E21B44/06; E21B1/00; E21B1/12; E21B1/24; E21B1/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
219 words
Improved rock drilling apparatus 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 flushing liquid valvE including actuator means operable to provide flushing liquid to said drill steel and to shut off flushing liquid to said drill steel; conduit means operable to be in communication with said source for supplying pressure fluid to said percussion motor and said feed motor to operate said drill in the forward feed condition; supply valve means interposed in said conduit means operable to interrupt the flow of pressure fluid to said percussion motor and said feed motor; supply means operable to supply pressure fluid to operate said feed motor in the reverse feed condition; and, control means including a position sensing element mounted forwardly on said support and operable to be engaged by said rock drill, and time delay means responsive to the engagement of said position sensing element by said drill for actuating said flushing liquid valve to shut off flushing liquid to said drill steel at the expiration of a predetermined time period commencing with the engagement of said position sensing element.
Claim 2
Dependent Claim
219 words
Improved rock drilling apparatus 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 flushing liquid valvE including actuator means operable to provide flushing liquid to said drill steel and to shut off flushing liquid to said drill steel; conduit means operable to be in communication with said source for supplying pressure fluid to said percussion motor and said feed motor to operate said drill in the forward feed condition; supply valve means interposed in said conduit means operable to interrupt the flow of pressure fluid to said percussion motor and said feed motor; supply means operable to supply pressure fluid to operate said feed motor in the reverse feed condition; and, control means including a position sensing element mounted forwardly on said support and operable to be engaged by said rock drill, and time delay means responsive to the engagement of said position sensing element by said drill for actuating said flushing liquid valve to shut off flushing liquid to said drill steel at the expiration of a predetermined time period commencing with the engagement of said position sensing element.
Claim 3
Dependent Claim
87 words
The invention set forth in claim 1 wherein: said reverse feed supply means comprises conduit means in communication with said source and said feed motor, reverse supply valve means interposed in said conduit means including an actuator for operating said reverse supply valve means to provide pressure fluid to said feed motor, and said time delay means provides for the operation of said supply valve means actuator at the expiration of a predetermined time period commencing with the engagement of said position sensing element by said drill.
Claim 4
Dependent Claim
58 words
The invention set forth in claim 2 wherein: said flushing liquid valve actuator means is pressure fluid operated and is in communication with said reverse supply conduit means whereby upon operation of said reverse supply valve to provide pressure fluid to said feed motor said flushing liquid valve operates to shut off flushing liquid to said drill steel.
Claim 5
Dependent Claim
299 words
Improved rock drilling apparatus 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 reversible therealong; a source of pressure fluid; a flushing liquid valve including actuator means operable to provide flushing liquid to said drill steel and to shut off flushing liquid to said drill steel; conduit means in communication with said source for supplying pressure fluid to said percussion motor and said feed motor to operate said drill in the forward feed condition; supply valve means interposed in said conduit means operable to interrupt the flow of pressure fluid to said percussion motor and said feed motor; reverse feed supply means comprising a conduit in communication with said source and said feed motor, and valve means interposed in said conduit including a pressure fluid actuator for operating said valve means to provide pressure fluid to said feed motor; and, control means comprising a fluid circuit in communication with said source and said pressure fluid actuator, a position sensing element comprising valve means interposed in said circuit and mounted forwardly on said support and operable to be engaged by said drill to provide for flow of pressure fluid to operate said pressure fluid actuator, and time delay means comprising a reservoir and flow control means interposed in said fluid circuit and operable to control the rate of flow of pressure fluid in said circuit to delay the operation of said pressure fluid actuator and to provide for actuating said flushing liquid valve to shut off flushing liquid to said drill steel at the expiration of a predetermined time period commencing with the engagement of said position sensing element.
Claim 6
Dependent Claim
299 words
Improved rock drilling apparatus 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 reversible therealong; a source of pressure fluid; a flushing liquid valve including actuator means operable to provide flushing liquid to said drill steel and to shut off flushing liquid to said drill steel; conduit means in communication with said source for supplying pressure fluid to said percussion motor and said feed motor to operate said drill in the forward feed condition; supply valve means interposed in said conduit means operable to interrupt the flow of pressure fluid to said percussion motor and said feed motor; reverse feed supply means comprising a conduit in communication with said source and said feed motor, and valve means interposed in said conduit including a pressure fluid actuator for operating said valve means to provide pressure fluid to said feed motor; and, control means comprising a fluid circuit in communication with said source and said pressure fluid actuator, a position sensing element comprising valve means interposed in said circuit and mounted forwardly on said support and operable to be engaged by said drill to provide for flow of pressure fluid to operate said pressure fluid actuator, and time delay means comprising a reservoir and flow control means interposed in said fluid circuit and operable to control the rate of flow of pressure fluid in said circuit to delay the operation of said pressure fluid actuator and to provide for actuating said flushing liquid valve to shut off flushing liquid to said drill steel at the expiration of a predetermined time period commencing with the engagement of said position sensing element.
Claim 7
Dependent Claim
33 words
The invention set forth in claim 4 wherein: said flow control means comprises adjustable valve means operable to be adjusted to vary the rate at which pressure fluiD flows through said fluid circuit.
References Cited (Backward Citations)
US2987872A
Cited
US3381761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |