Title: Withdrawal of particulate material from a hopper

Abstract: Pneumatically-conveyable particulate material is withdrawn from a hopper using vacuum wands extending into the interior of the hopper. The wands are operated in a cyclic sequence, with material being withdrawn from each wand in turn. This permits material to be withdrawn substantially continuously where the material tends to compact together in flow-preventing bridges and the invention can be put into practice employing a relatively simply applied attachment connected on the exterior of the hopper.

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Inventors: Smith, Kenneth C. (Woodstock, CA, US)

Application Number: 010951
Filing Date: 1979-02-09
Publication_date: 1980-09-09
Assignee: Teledyne Canada Ltd. (Rexdale, CA)
Primary Class(es): 406/118 406/123
Other Classes:
US Patent Ref:

489340	Jan, 1893	Stoner	406/118.
730934	Jun, 1903	Leary	406/123.
2673127	Mar, 1954	Gebhardt	406/118.
3224648	Dec, 1965	Zimmerman	222/193.
3316028	Apr, 1967	Lloyd	406/118.
3544167	Dec, 1970	Fuchu et al.	406/116.

Other Refs:
Primary Examiner: Reeves, Robert B.
Assistant Examiner: Church, Gene A.
Attorney: Ridout & Maybee