Power tools and hammer mechanisms therefor
CA 2122405 C · Owner: Black & Decker Inc. · Inventors: Bourner, Michael David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hammer mechanism (200,200') for a power tool comprises a housing (203) a chuck spindle (201) journalled for rotation in the housing and having axial freedom of movement in the housing a rotary ratchet (204) fixed on the spindle the ratchet having teeth (207) facing a rear end of the housing a fixed ratchet (205) rotationally fixed in the housing but having axial freedom of movement in the housing the fixed ratchet surrounding the spindle and having teeth (207) facing the teeth of the rotary ratchet and resilient biassing means (213) between said fixed ratchet and housing urging said fixed ratchet towards said rotary ratchet. First cam means (208,209) between said fixed and rotary ratchets …
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 April 28, 1994 and granted January 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 28, 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.