Control system for a rock drill
CA 1111738 A · Owner: Oy Tampella Ab · Inventors: Helin, Aimo; Salmi, Pekka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pressure medium operated control system for a rock drill is described, for preventing the drill steel form getting stuck and for releasing the drill steel if stuck. The system comprises a striking apparatus, a rotation motor and a feed motor with control valves and sources for pressure medium and at the striking, end of the drill steel a shank adapter which can be brought into striking contact with the striking piston by means of a shank cylinder and thereto connected pressure medium source also, during the return movement of the drill. Pressure medium is fed into the said shank cylinder through a pressure controlled directional control valve which is controlled through the pressure line or …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted November 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.