Grinding machine
OwnerNobuyuki Izumisawainventor
Life of this patent
Estimating the term…
Abstract
Compressed air fed into a directional control sleeve is alternatingly delivered to two cylinders via a directional control valve. Pistons within the respective cylinders are each provided with a rack gear moved by feeding compressed air into the cylinders. A grindstone attached to a second set of rack gears is reciprocated through pinion gears by movement of the first-mentioned rack gears. As the grindstone reciprocates, a valve operating arm pivotally supported by a pin is caused to rotate back and forth to switch the directional control valve, thereby switching the cylinder that receives the compressed air. The grinding machine is thus capable of performing grinding in continuous fashion.
Claims1
A grinding machine comprising:
- a main body;
- a directional control valve case provided on said main body;
- a directional control sleeve fixedly secured within said directional control valve case;
- a valve for feeding compressed air into said directional control sleeve;
- first and second cylinders provided within said main body at front and rear ends thereof;
- a directional control valve slidable back and forth within said directional control sleeve for communicating said first and second cylinders;
- first and second pistons for reciprocating within said first and second cylinders, respectively;
- first and second rack gears provided on said first and second pistons, respectively;
- first and second pinions meshing with said first and second rack gears, respectively;
- an operating plate having a grinding body attached to a lower surface thereof;
- third and fourth rack gears provided on said operating plate and meshing with said first and second pinions 18, 18', respectively, for reciprocating said operating plate;
- a guide provided on said operating plate;
- and
- a valve operating arm 12 having one end engaging said guide and another end engaging said directional control valve, said valve operating arm being pivotally supported on said main body by a pin for switching said directional control valve in response to reciprocation of the said operating plate.
Dependencies are inferred from the claim text.