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US 4,953,295 AGranted
Seawater hydraulic band saw
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsScott Barradas, Bruce Farber, William B. Luther
Life of this patent
Estimating the term…
Abstract
A seawater powered band saw having a rigid frame or housing, a control handle and valve assembly having a trigger which when engaged by an operator delivers pressurized seawater to a seawater powered vane motor, a novel seawater lubricated spur and pinion gear drive arrangment connecting the vane motor in a driving relationship to a band saw drive wheel, an idler take-up assembly to tension the saw blade and facilitate the changing of saw blades and a safety guard assembly to protect the blade when the band saw is non-operational and protect the operator when the band saw is operational.
Claims16
A portable band saw which uses pressurized seawater as the operating fluid comprising:
- a drive wheel having a pulley tire on the periphery thereof, said pulley tire having an abrasive strip attached thereto;
- a driven wheel having a pulley tire on the periphery thereof, said pulley tire having an abrasive strip attached thereto;
- a continuous band-type saw blade mounted on said drive and driven wheels;
- motor means having an inlet port, an exhaust port, and a shaft, the inlet of said motor means being adapted for receiving pressurized seawater so as to activate said motor means thereby causing the shaft thereof to rotate;
- control means connected to the inlet port of said motor means and having a trigger, the trigger of said control means when engaged allowing pressurized seawater to pass through said control means to said motor means thereby activating said motor means;
- means for transmitting the rotational motion of the shaft of said motor means to said drive wheel, said transmitting means being lubricated by pressurized seawater provided through the exhaust port of said motor means;
- adjustment means for changing said saw blade by moving said driven wheel toward said drive wheel and thereby relaxing tension on said saw blade and then tightening said saw blade by moving said driven wheel away from said drive wheel;
- and
- frame means supporting said drive and driven wheels, said transmitting means, said control means, said motor means and said adjustment means.
6 more elements
A pressurized seawater powered band saw comprising:
- a drive wheel having a pulley tire on the periphery thereof, said pulley tire having an abrasive strip attached thereto;
- a driven wheel having a pulley tire on the periphery thereof, said pulley tire having an abrasive strip attached thereto;
- a continuous band-type saw blade mounted on said drive and driven wheels;
- a seawater powered motor having an inlet, an exhaust port, and a shaft, said shaft having a spherical shaped surface enlarged region at the end thereof;
- a drive train housing having said seawater powered motor attached thereto and the shaft of said motor journalled therein;
- a spline shaft journalled within said drive housing, said spline shaft having a spherical shaped surface enlarged region at one end thereof;
- a first pinion gear fixed on said spline shaft;
- a spline coupling for connecting the spherical shaped surface enlarged regions of said motor shaft and said spline shaft, said spline coupling having a coupling spacer positioned between said motor shaft and said spline shaft;
- an intermediate shaft journalled within said drive housing;
- a first spur gear fixed on said intermediate shaft, said first spur gear being in mesh with said first pinion gear;
- a second pinion gear fixed on said intermediate shaft;
- a drive shaft journalled within said drive housing, said drive shaft being in rotational engagement with said drive wheel;
- a second spur gear fixed on said drive shaft, said second spur gear being in mesh with said second pinion gear;
- a control handle assembly having an adapter block attached to said drive train housing, a cavity, an inlet passageway connected to said cavity and an outlet passageway connected between said cavity and the inlet port of said motor;
- a valve having a valve seat mounted within the cavity of said control handle assembly, a stem slidingly fitted within the cavity of said control handle assembly, and a spring;
- said valve stem having a trigger pin at one end, an indent and a conical shaped face adjacent said indent with the spring of said valve being adapted to hold the conical shaped face of said valve stem against said valve seat;
- a trigger rotatably affixed to said control handle assembly, said trigger being connected to the trigger pin of said valve stem such that engagement of said trigger releases the conical shaped face of said valve stem from said valve seat allowing pressurized seawater to flow from the inlet passageway of said control handle assembly through the indent of said valve stem and the outlet passageway of said control handle assembly into the inlet of said motor;
- and
- a frame supporting said drive and driven wheels and said drive train housing.
16 more elements
Dependencies are inferred from the claim text.