Rotary roller bit with improved seal means
CA 1087163 A · Owner: Sandvik Aktiebolag · Inventors: Levefelt, Bert G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, The present invention provides an improved means for sealing-the roller cutter lubrication system in sealed roller bits. By providing an air barrier in a narrow space between the leg of the bit body and the rotary cutter it is possible to effectively protect any seal, located between the leg and the entry of the cutter, from being damaged. By providing a narrow space of suitable height it has been found possible to provide such over-pressure inside said space that an effective barrier of air under pressure is provided as an assistance to the seal means provided to seal the roller cutter lubrication system. This eliminates the risk for dirt and particles to …
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
- Granted October 7, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 7, 1997.
- 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.