Air duct and furnace cleaning system and method
OwnerPaul A. Richardsoninventor
Life of this patent
Estimating the term…
Abstract
A power vacuum truck having a movable roof to accommodate expanding vacuum bags, and a method of raising the roof are disclosed. The power vacuum truck utilizes a hydraulic pump to drive a fan and compressor in order to eliminate mechanical linkages and the concomitant breakdown and maintenance associated therewith, and eliminates holes in the roof previously necessary to accommodate the expandable vacuum bags. An vehicle having an automatic transmission can be used.
Claims10
A power vacuum truck comprising:
- a truck having a cab and a main body with expandable vacuum bags disposed in said main body, said main body including a roof;
- means in said truck for pneumatically raising said roof to accommodate said expandable vacuum bags in their expanded condition, said means comprising an air cylinder having an air cylinder arm coupled to a first roof supporting post having first and second racks thereon, said first rack engaging a first gear coupled to a first shaft extending to a second gear engaging a third rack on a second roof supporting post, said second rack engaging a third gear coupled to a second shaft, said second shaft extending to a fourth gear engaging a fourth rack on a third roof supporting post, said third roof supporting post also having a fifth rack engaging a fifth gear coupled to a third shaft extending to and engaging a sixth rack on a fourth roof supporting post via a sixth gear;
- and
- means in said truck for pneumatically lowering said roof to a closed position when said expandable vacuum bags are deflated.
A method of raising the roof of a power vacuum truck having an air cylinder having an arm, a hydraulic pump, a hydraulic motor, a compressor driven thereby and a vacuum cylinder coupled to a bypass valve, said bypass valve regulating the flow of hydraulic fluid from said hydraulic pump to said hydraulic motor in that when said bypass valve is in a first position, hydraulic fluid bypasses said motor, and when said bypass valve is in a second position, hydraulic fluid flows to said motor to drive said compressor, comprising:
- activating said vacuum cylinder so as to cause said bypass valve to be in said second position;
- and
- supplying compressed air from said compressor to said air cylinder so as to move said air cylinder arm and thereby raise said roof.
Dependencies are inferred from the claim text.