Abstract A lightweight percussion device operating from a motor driven crank which reciprocates a hollow inner cylinder closed at both ends and slidably mounted in an outer cylinder with a piston having a rod extending through one end of the inner cylinder and slidably mounted in the inner cylinder; a set of ports are provided adjacent each end of the inner cylinder and spaced from the adjacent end of the inner cylinder and one set of ports spaced from the other ports a distance in the order of the throw of the crank with the ports communicating with the atmosphere so that rotation of the crank causes reciprocation of the inner cylinder and the confined gas between the end of the piston and the adjacent end of the inner movable cylinder causes the piston to reciprocate while the piston is cushioned at each end of its movements and the rod projecting from the piston serves to produce a hammering action on a gad or other tool.
A percussion device comprising an outer cylinder, a crank mounted on said outer cylinder, a small rotary motor power means to rotate said crank, an inner hollow cylinder having closed ends slidably mounted in said outer cylinder and operatively connected to said crank whereby when said crank rotates said inner cylinder reciprocates, a piston mounted for reciprocation in said inner cylinder, a rod extending from said piston through an end wall of said inner cylinder, said inner cylinder having ports spaced from the ends whereby rotation of said crank causes reciprocation of said inner cylinder and thereby reciprocation of said piston by the force of compressed gas confined in the alternately closed ends of the hollow inner cylinder, the rod of said piston being adapted to impact a tool producing a hammering action on the tool, the crank radius being approximately the same as the distance from the end of the inner cylinder to the adjacent ports, the inner cylinder having a reduced outside diameter intermediate the ends and the ports are located in this reduced diameter portion, and the length of the piston is substantially equal to the distance between one end and the ports adjacent the other end of the inner cylinder.
Claim 2
Dependent Claim
204 words
A percussion device comprising an outer cylinder, a crank mounted on said outer cylinder, a small rotary motor power means to rotate said crank, an inner hollow cylinder having closed ends slidably mounted in said outer cylinder and operatively connected to said crank whereby when said crank rotates said inner cylinder reciprocates, a piston mounted for reciprocation in said inner cylinder, a rod extending from said piston through an end wall of said inner cylinder, said inner cylinder having ports spaced from the ends whereby rotation of said crank causes reciprocation of said inner cylinder and thereby reciprocation of said piston by the force of compressed gas confined in the alternately closed ends of the hollow inner cylinder, the rod of said piston being adapted to impact a tool producing a hammering action on the tool, the crank radius being approximately the same as the distance from the end of the inner cylinder to the adjacent ports, the inner cylinder having a reduced outside diameter intermediate the ends and the ports are located in this reduced diameter portion, and the length of the piston is substantially equal to the distance between one end and the ports adjacent the other end of the inner cylinder.
Claim 3
Dependent Claim
38 words
The invention according to claim 1 in which the outer cylinder includes an outer and inner sleeve with clearance between the sleeves and are provided intermediate and at both ends in the inner sleeve to the ambient air.
Claim 4
Dependent Claim
23 words
The invention according to claim 2 in which the openings in the inner sleeve are located adjacent each end and adjacent the midportion.