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US 3,938,217 AGranted
Surface cleaning pickup head
AssigneeClarke-Gravely Corporation
InventorJack L. Hommes
Life of this patent
Estimating the term…
Abstract
The specification discloses a surface cleaning apparatus having an air blast pickup head in which the suction in the exhaust chamber can be increased by the operator during operation of the apparatus to facilitate the ingestion of larger objects of debris and litter.
Claims17
A surface cleaning apparatus comprising:
- a pickup head defining an exhaust chamber;
- an air delivery flow circuit operably connected to said exhaust chamber for delivering air under pressure to said exhaust chamber;
- an air exhaust circuit operably connected to said exhaust chamber for exhausting air therefrom;
- a vent on said air delivery circuit for venting said air delivery circuit to the atmosphere, said vent being located outside of said exhaust chamber and on the upstream air flow side thereof;
- said vent being sufficiently large to vent a substantial portion of air under pressure to the atmosphere;
- closure means on said vent;
- actuating means operably connected to said closure means and being conveniently located on said apparatus for actuation by an operator operating said surface cleaning apparatus whereby as said pickup head approaches large items of debris, the operator can open said vent by actuating said actuating means, to create a greater negative pressure in said exhaust chamber with respect to the atmosphere whereby the ingestion of large items of debris and litter is facilitated.
4 more elements
A surface cleaning apparatus comprising a pickup head;
- said pickup head including an air delivery plenum chamber and a separate exhaust chamber, said air delivery chamber being in flow communication with said exhaust chamber through an air blast nozzle means;
- blower means for generating a vacuum on one side thereof and for generating air under pressure on the other side thereof;
- an air delivery line operably connected to said blower means on said pressure generating side thereof and operably connected to said air delivery plenum chamber of said pickup head;
- an exhaust flow line operably connected to said exhaust chamber of said pickup head and operably connected to said blower means on said suction generating side thereof;
- a debris collecting chamber being operably connected to said exhaust line between said exhaust chamber and said blower means;
- vent means in said air delivery plenum chamber for venting said air delivery plenum chamber to the atmosphere;
- said vent means being sufficiently large to vent a substantial portion of air under pressure to the atmosphere;
- closure means on said vent means for normally closing said vent means;
- actuating means operably connected to said closure means and being conveniently located for actuation by an operator operating said surface cleaning apparatus whereby when said pickup head approaches a large debris, the operator can open said vent means by actuating said actuating means and thereby opening said closure on said vent means, thereby creating a greater negative pressure in said suction chamber of said pickup head.
6 more elements
Dependencies are inferred from the claim text.