Mechanism for driving the worm screws of a double worm screw extruder
CA 1311141 C · Owner: Plastronica Ag · Inventors: Schiffer, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The two worm screws of a double worm screw extruder have drive shafts of different lengths. To drive one of the worm screws, a pinion (1) is keyed to the longer drive shaft (2), the pinion (1) being driven by a motor pinion (3). In order to drive the second worm screw there is provided, firstly, an additional shaft 6 which carries on one end a pinion (5) and on the other end a pinion (7), and, secondly, a pinion (10) mounted on the longer drive shaft (2). The pinion (5) is driven by the motor pinion (3), and the two pinions (7 10) mesh with, a pinion (8) which is keyed to the shorter drive shaft (11). A drive is created which can be kept small in view of the relatively small number of …
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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 December 8, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 8, 2009.
- 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.