WORKING BENCH LIFT DEVICE FOR PILE DRIVER

摘要

PROBLEM TO BE SOLVED: To provide a working bench lifting device which prevents any possible damages attributable to a collision between a working bench and a construction mechanism. ;SOLUTION: This lift device is provided with a working bench 80 having a movable mount 42 supported movably along second guide rails 36, 38 provided in a reader 2 and a boarding mount 60 supported turnably on the movable mount 42 around a support shaft 62. A hydraulic actuator 76 is provided so as to move the boarding mount 60. It is also provided with a spring 78 which energizes the boarding mount 60 in the releasing direction from an auger drive mechanism 12 while a shelter mechanism provided with a directional control valve is provided, which communicates the hydraulic actuator 76 with a lower pressure side due to the access between the auger drive mechanism 12 and the boarding mount 60.;COPYRIGHT: (C)1998,JPO