Hammer drill
CA 1136446 A · Owner: Kango Electric Hammers Limited · Inventors: Ince, Norman J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a rotary hammer drill in which the tool is driven in rotation by rotating the cylinder 21 housing a driver piston 30 and a striker 32 the, hammering effect is rendered inoperative by providing in the well of the barrel an aperture 35 which is axially positioned so as to vent the space between the driver and striker to atmosphere. A sleeve 37 is mounted on the external surface of the barrel and is axially movable to blank off the aperture 35 or to place it in communication with the ambient atmosphere.
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 November 30, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 30, 1999.
- 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.