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US 5,161,450 AGranted
Air motor with warm air introduction means to prevent freezing
AssigneeGraco Inc.
InventorYasuo Ishikawa
Life of this patent
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Abstract
A device to prevent freezng of a reciprocating air motor which drives a reciprocating plunger pump for liquid pressurized transport in which a passage exclusively for exhaust which is connected to an exhaust passage and a exhaust pipe which is connected to this passage exclusively for exhaust are installed, as is a compressed air switch valve and an air tube which supplies hot air to the exhaust passage.
Claims3
A reciprocating air motor comprising:
- a cylinder;
- a piston in said cylinder;
- an exhaust passage connected to said cylinder for exhausting air after work has been performed;
- and
- means for introducing a continuous flow of relatively warm compressed air into said exhaust passage, said compressed air introduction means comprises a tube at least partially located in said exhaust passage;
- and
- an air switch valve controlling the flow of air in a first direction through said exhaust passage wherein said compressed air introduction means directs compressed air at said air switch valve.
4 more elements
Dependencies are inferred from the claim text.