Abstract: A vacuum adsorber includes a base (4); an adsorption member (3) attached to the base and made from an elastic material so as to have a vacuum cavity (2) with an opening (3a) on a side opposite to the base; a slider (5) having a friction face (7) and a periphery sliding along a side wall of the vacuum cavity; a spring member (15) provided within the vacuum cavity for biasing the slider toward the opening; a vacuum tube (6) for connecting the vacuum cavity to a vacuum source; and a through-hole (8) provided on the friction face for allowing fluids to enter the vacuum cavity.

Abstract: A robot traveling on wall face is capable of advancing or retreating on the wall face in a stable manner with a quick change-over of its traveling direction with the help of a plurality of movable adsorption discs designed for a close contact with the wall face, and a pair of fixed adsorption rods, while commencing to be moved by drive motors. The adsorption force by these movable adsorption discs is constantly so large that no worry of dropping the robot from the wall surface is needed. The frictional resistance of each frictional surface promotes contact between the robot and the wall face. Thereby, the robot works on the wall in a safe manner, instead of human workers.

Abstract: A massage device including a casing with a pair of openings; a pair of foot rests with a sheet covering the opening; a pair of movable units provided within the casing and movable in an X-axis direction; a pneumatic or hydraulic engine with a hydraulic cylinder secured to the movable unit such that it is movable in a Y-axis direction perpendicular to the X-axis direction and has a piston rod with a pressure unit at its free end for applying an intermittent pressure to part of the body through the sheet; a fluid supplying circuit for supplying a fluid to the hydraulic cylinder; and a pressure control device for controlling a maximum pressure of a fluid supplied to the hydraulic cylinder.