Shaft boring machine and method
CA 1238926 A · Owner: The Robbins Company · Inventors: Sugden, David B.; Cass, David T.; Dowden, Peter B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shaft boring machine (10) including a rotatable cutterwheel assembly (12) with a horizontal axis mounted on a carriage (102) having vertical travel. The carriage (102) is mounted on a slewing base frame (110) and rotates about the vertical axis (64) of the machine. An excavating unit (48) for muck removal is mounted opposite the cutterwheel (12) on the slewing base frame (110) and loads directly from the shaft bottom into a muck hopper (24). When the hopper (24) is full, it is discharged into a hoist bucket (68) which is hoisted to the surface. The machine is positioned in the shaft by upper and lower gripper systems (44 and 34). Walking cylinders (40) between the two gripper rings (46 …
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 July 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 5, 2005.
- 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.