Drilling device for a rock drill
CA 2104705 C · Owner: Sig Schweizerische Industrie-Gesellschaft · Inventors: Mundjar, Marjan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a rock drill (2) for activating a rotatable and reciprocable drill steel assembly (Fig. 1). A reversible motor (50) is coupled to a striking bar (3) for rotating the drill steel. The striking bar is struck by a percussion piston (10). A rotary fluid valve (15) is operating the piston. A disconnectable coupling (37,38,43) in normal operation couples both the valve (15) and the striking bar (3) with the motor (50). In special modes the motor operates only the percussion piston, e.g. for retracting a drill rod, or only rotates the striking bar (3) e.g. for, connecting and disconnecting drill rods.
Read the whole patent
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
- Filed August 24, 1993 and granted August 5, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 24, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 24, 2015.
- 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.