Mine roof supports
CA 1108420 A · Owner: Fletcher Sutcliffe Wild Limited · Inventors: Smith, John C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mine roof support comprises a plurality of hydraulically extensible chock legs 5,6 articulated at, upper ends thereof to one or more roof beams 3 and at lower ends thereof to one or more base members 1 a shield 9, pivotally connected to a rearward part of the base member 1 and also pivotally connected to a rearward part of the roof beam 3, with permanently pressurised rams 12 both located between a pair of laterally spaced chock legs 6 and one located to each side of the centre line 19 of the support, the rams being mutually inclined with respect to the centre line 19 and reacting via the shield 9 on the roof beam 3, and a pair of tie bars 11 located one at or towards each side of the …
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 September 8, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 8, 1998.
- 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.