Patent ID: 8667790

Claim:
A universal hole cutter, comprising: an oil cylinder ( 1 ) fixedly threaded with a pipe joint ( 5 ) communicating with the internal cavity of the oil cylinder; a projected annular connection piece ( 1 a ) set on one side of the oil cylinder ( 1 ) and connected to the pipe joint ( 5 ); a projected stopper ( 5 a ) set on a side of the pipe joint ( 5 ); a seal gasket ( 6 ) positioned on the pipe joint ( 5 ) and tightly pressed between the stopper ( 5 a ) and the connection piece ( 1 a ); an oil pump body ( 2 ) in communication with the pipe joint ( 5 ) through a rigid movable linkage mechanism that is capable of rotating the oil cylinder ( 1 ) with respect to the oil pump body ( 2 ); an oil storage chamber ( 3 ) fixedly connected to the oil pump body ( 2 ), with oil paths thereof in communication with each other; and a pressure mechanism provided on the oil pump body ( 2 ) for pressing power oil within the oil storage chamber ( 3 ) into the oil cylinder ( 1 ); wherein the rigid movable linkage mechanism is a rigid connection pipe ( 4 ), a first end of the connection pipe ( 4 ) is in communication with the oil storage chamber ( 3 ) and a second end of the connection pipe ( 4 ) is hinged to the pipe joint ( 5 ), and oil paths of the oil cylinder ( 1 ) and oil pump body ( 2 ) are in communication with each other through the pipe joint ( 5 ) and the connection pipe ( 4 ); and wherein the seal gasket ( 6 ) consists of an inner ring ( 6 a ) made of rubber and an outer ring ( 6 b ) made of metal, and the inner ring ( 6 a ) is positioned next to the inner side of the outer ring ( 6 b ).