Shaft bearing in a rock and ground-drilling machine
CA 2178596 A1 · Owner: Jonsson, Gunnar · Inventors: Nordqvist, Ulf; Jonsson, Gunnar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rock or ground-drilling machine includes a gear housing (14) in which there is journalled a shaft (31) which surrounds a drill string (23) m the manner of a sleeve and which is affixed to the drill string by means of a chuck (7) connected to the shaft (31). The chuck is operated by means of pressure fluid delivered to the chuck (27) through the medium of a commutator (36) acting between the gear housing (14) and the shaft (31). The shaft (31) is journalled in the gear housing (14) by means of one single rolling bearing (39). The commutator (36) lies resiliently against the gear housing (14) and is flexible in response to sideways movement of the shaft (31).
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 December 8, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2016.
- 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.