US3666025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collaring timing control system for rock drills
Assignee: Gardner Denver Inc
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Filing: 1970-09-11
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Granted: 1972-05-30
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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
2026-10-27 14:06
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
185 words
Improved rock drilling apparatus comprising: an elongated support; a fluid operated rock drill movably 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 conduit in communication with said source and said percussion motor; flow control means interposed in said conduit operable to reduce the quantity of pressure fluid flowing to said percussion motor; a first supply valve in said conduit actuatable to supply pressure fluid to said percussion motor for collaring a drill hole; a second supply valve in communication with said source and said percussion motor operable to supply pressure fluid to said percussion motor at substantially supply pressure; and, control means operable to actuate said first supply valve to supply a reduced quantity of pressure fluid to said percussion motor, said control means including timing means responsive to the actuation of said first supply valve for operating said second supply valve after a predetermined time period commencing with the actuation of said first supply valve.
Claim 2
Dependent Claim
185 words
Improved rock drilling apparatus comprising: an elongated support; a fluid operated rock drill movably 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 conduit in communication with said source and said percussion motor; flow control means interposed in said conduit operable to reduce the quantity of pressure fluid flowing to said percussion motor; a first supply valve in said conduit actuatable to supply pressure fluid to said percussion motor for collaring a drill hole; a second supply valve in communication with said source and said percussion motor operable to supply pressure fluid to said percussion motor at substantially supply pressure; and, control means operable to actuate said first supply valve to supply a reduced quantity of pressure fluid to said percussion motor, said control means including timing means responsive to the actuation of said first supply valve for operating said second supply valve after a predetermined time period commencing with the actuation of said first supply valve.
Claim 3
Dependent Claim
19 words
The invention set forth in claim 1 wherein; said timing means is operable to vary said predetermined time period.
Claim 4
Dependent Claim
231 words
Improved rock drilling apparatus comprising: an elongated support; a fluid operated rock drill movably 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 conduit in communication with said source and said percussion motor; flow control means interposed in said conduit operable to reduce the quantity of pressure fluid flowing to said percussion motor; a first supply valve in said conduit including a pilot actuator operable when supplied with pressure fluid to actuate said supply valve to supply pressure fluid to said percussion motor for collaring a drill hole; a second supply valve having a pilot actuator and being in communication with said source and said percussion motor for supplying pressure fluid to said percussion motor at substantially supply pressure; and, control means including timing means and a fluid circuit in communication with said source and said first and second supply valves for supplying pilot actuator fluid thereto, a control valve in said fluid circuit operable to be actuated to start said percussion motor by supplying pressure fluid to actuate said first supply valve, and said timing means is operable to provide pressure fluid to actuate said second supply valve after a predetermined time period commencing with the actuation of said first supply valve.
Claim 5
Dependent Claim
231 words
Improved rock drilling apparatus comprising: an elongated support; a fluid operated rock drill movably 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 conduit in communication with said source and said percussion motor; flow control means interposed in said conduit operable to reduce the quantity of pressure fluid flowing to said percussion motor; a first supply valve in said conduit including a pilot actuator operable when supplied with pressure fluid to actuate said supply valve to supply pressure fluid to said percussion motor for collaring a drill hole; a second supply valve having a pilot actuator and being in communication with said source and said percussion motor for supplying pressure fluid to said percussion motor at substantially supply pressure; and, control means including timing means and a fluid circuit in communication with said source and said first and second supply valves for supplying pilot actuator fluid thereto, a control valve in said fluid circuit operable to be actuated to start said percussion motor by supplying pressure fluid to actuate said first supply valve, and said timing means is operable to provide pressure fluid to actuate said second supply valve after a predetermined time period commencing with the actuation of said first supply valve.
Claim 6
Dependent Claim
83 words
The invention set forth in claim 3 wherein: said drilling control circuit includes a control valve operable to provide pilot actuator fluid to said second supply valve to actuate same and thereby provide pressure fluid at substantially supply pressure to said percussion motor for drilling a hole, and said drilling control valve includes a pilot actuator in communication with said timing means and operable to receive pressure fluid therefrom after a predetermined time period commencing with the actuation of said first supply valve.
Claim 7
Dependent Claim
86 words
The invention set forth in claim 4 wherein: said timing means includes conduit means operable to be in fluid flow communication with said source of pressure fluid and said pilot actuator of said drilling control valve, adjustable valve means interposed in said conduit means, and reservoir means interposed in said conduit means between said adjustable timing valve and said drilling control valve pilot actuator, and said timing valve means is operable to control the rate of flow of pressure fluid from said source into said reservoir.
References Cited (Backward Citations)
US2405172A
Cited
US3319725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |