Piston rod support

Claim 1

In a piston-cylinder mechanism including a cylinder, a pressure fluid actuated piston movable back and forth in said cylinder, a cylinder head which closes off the cylinder at one end thereof, a piston rod secured on the piston, said piston rod penetrating through a through opening in said cylinder head for carrying out a working movement, a bearing and sealing and stripping sleeve device located in the through opening between its peripheral wall and the piston rod, said sleeve device encircling said piston rod and being axially fixed in said through opening for sealing off the cylinder chamber and for wiping dirt particles off from the piston rod, said sleeve device having at its two ends, respectively, a sealing lip and a sealing and stripping lip each bearing on the piston rod, the improvement comprised in that the sleeve device has two parts, the first part being an elongate inner bearing bushing of a bearing material and the second part being an elongate outer sleeve of elastic material, said elastic outer sleeve being axially longer than the bearing bushing and having a pair of end sections which project axially beyond the bearing bushing and project radially inwardly and respectively form the sealing lip and the sealing and stripping lip, the bearing bushing being positioned axially clearance-free in a radially shallow recess of the elastic outer sleeve between the two lips thereof and being held in a snap fit therebetween, said elongate bearing bushing being of length substantially exceeding its radial thickness and substantially exceeding the axial length of said lips, the axial length of said elastic sleeve substantially exceeding the radial thickness thereof.