ADVANCE/RETREAT CHANGEOVER HAND PUMP FOR VIBRATION COMPACTOR

摘要

PROBLEM TO BE SOLVED: To provide an advance/retreat changeover hand pump for a vibration compactor in which changeover operation to move back and forth a machine body by transferring the rotation of one pendulum in an oscillator for the vibration compactor can be performed by a light operation force in a compact and simple structure. SOLUTION: This hand pump is provided with a piston 28 receiving a mechanical return hydraulic pressure from a hydraulic cylinder 23 direction of an oscillator device 4 through a cylinder 27 on the back face, and a rod 30 provided with a ball valve 38 inserted in the piston, in the body 25 of an advance/retreat changeover hand pump 20 connected to the hydraulic cylinder 23 equipped at one of an advance/retreat changeover shaft 17 in the oscillator device 4 through a hydraulicoil passage. Further it is provided with a rotary shaft 31 of an advance/retreat lever 29 in an oil chamber 25a of the front end of the body at the opposite side of the piston and a cam 32 coming into contact with the front end of the rod 30 in the rotary shaft 31.