Low-profile crane without topping tower
CA 1098489 A · Owner: Speedcranes Limited · Inventors: Morrison, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A Low-Profile Crane without Topping Tower A hoisting line (9) extends from a winch (8) over a, second pulley (12) at the head end (3) of the jib (1) of a crane, around a movable pulley (14) and over a third pulley (13) at the head end (3) of the jib (1) to a depending load hook (18). The movable pulley (14) is supported by a topping line (7) which extends over a first pulley (11) at the tail end (2) of the jib (1), around a fifth pulley (15) fixedly mounted on the base (4) of the crane and is attached to the first pulley (11). Loading in the hoisting line (9) is therefore transferred to the topping line (7) extending between the first and fifth pulleys (11 and 15) and topping of the jib (1) …
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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 March 31, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 31, 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.