Patent ID: 6491304
Filing Date: 2002-12-10
Classification: B25B,F15B,Y10T

Abstract:
A cylinder of a short stroke having a guide, including a cylinder body provided therein with a piston chamber surrounded by a side wall, a rod-side end wall and a head-side end wall, and a piston slidably accommodated in the piston chamber, whereinsaid piston comprises a piston body which air-tightly slides in said piston chamber by action of fluid pressure, a piston rod extending from a central portion of said piston body and passing through said rod-side end wall and projecting outside of said cylinder body, and a guide hole formed in central portions of said piston body and said piston rod, said head-side end wall of said cylinder body includes a guide shaft extending from a central portion of an inner surface of said head-side end wall into said piston chamber and fitted into said guide hole, a plurality of sets of grooves are formed at positions at which an inner surface of said guide hole and an outer surface of said guide shaft are opposed such as to be located at positions which are symmetric with respect to a point of a center of the guide shaft, and a plurality of steel balls are interposed between the grooves such that said steel balls can roll.