Abstract: A manual nutcracker which includes a spring loaded ram which impacts a plunger with limited travel and strikes the nut shell in an enclosed chamber and shatters the shell without damaging the nut itself.

Abstract: A sawing device is attachable to an electric hand drill. The hand drill can be operated by either alternating current or direct current, using a battery. The battery operated drill eliminates the need for electrical cords, so it can be used anywhere. The saw bar may be made of material such as plastic that requires no lubricating oil, is lighter and less abrasive than conventional metal saw bars. There is also a non-metallic insert that will attach to a metal saw bar. This insert may go into the conventional metal saw bars with the same advantages as above. The hand drill rotation is transferred through a connecting shaft to the sprocket that drives the cutting chain, which travels on a chain bar with a single sprocket.

Abstract: The prime mover of a chain saw has an output shaft passing through the body of an oil pump. A fixing screw is inserted through an inserting hole provided in the body and is screwed into a threaded hole provided on the side of the prime mover. A cover plate, covering the area tip of the output shaft, is press fit onto the output shaft. The inserting hole is made as a threaded hole having a diameter through which the fixing screw is freely insertable but is also adapted to receive a removing screw which is larger in diameter than the fixing screw, and which abuts against the side of the prime mover. As a result, the inserting hole can be used in common also as the oil pump removing screwed hole and no extra removing screwed hole is required to be provided.