Abstract: A vibration isolation spring mount is disclosed. A compression coil spring is inserted between an inner sleeve and an outer sleeve and a pair of pads are disposed on the inner sleeve and the outer sleeve. Outwardly extending blades disposed on the open end of the inner sleeve are inserted into the spaces defined by inwardly extending teeth disposed on the open end of the outer sleeve, then the blades are rotated relative to the teeth until the teeth and the blades impingingly engage due to the compressed compression coil spring biasing the teeth against the blades.

Abstract: A vibration isolation spring mount is disclosed. A compression coil spring is inserted between an inner sleeve and an outer sleeve and a pair of pads are disposed on the inner sleeve and the outer sleeve. Outwardly extending blades disposed on the open end of the inner sleeve are inserted into the spaces defined by inwardly extending teeth disposed on the open end of the outer sleeve, then the blades are rotated relative to the teeth until the teeth and the blades impingingly engage due to the compressed compression coil spring biasing the teeth against the blades.

Abstract: The present invention provides an extendable pipe joint wherein the cylindrical pipe joint comprises first and second external cylinders disconnectably connected to each other; a first pressure-balancing cylinder is set in the first external cylinder; a second pressure-balancing cylinder is set in the second external cylinder so that it can be moved with a coupling lever in the axial direction; the first and second pressure-balancing cylinders have first and second pressure-balancing plates opposite to each other and are connected to each other with a first bellows; the second pressure-balancing cylinder and the second external cylinder are connected to each other with a second bellows; nozzles are formed on peripheral walls of the first and second pressure-balancing cylinders; and openings of the first and second pressure-balancing cylinders are connected to piping.

Abstract: A water hammer shock absorber comprising a casing provided on both side walls thereof with a hole and innerside thereof with a cavity adapted to have a pressurized gas sealed therein, a pipe having number of small perforations defined on the peripheral wall thereof between said hole of the casing, and an elastic tube covering the periphery of said pipe being fitted thereto in a watertight fashion.