Abstract: An air compressor comprises an air-compressing section and a pulsation-absorbing tank which are arranged isolated from each other, a nozzle, provided for one of the compressing section and the pulsation-absorbing tank, for supplying compressed air from the compressing section into the pulsation-absorbing tank, and a flexible nozzle seal provided for the other one of the compressing section and the pulsation-absorbing tank and having a hole in the center thereof. One end of the nozzle is inserted in the hole of the nozzle seal. With the nozzle inserted in the hole of the nozzle seal, the nozzle seal is applied with the pressure of the air contained in either the air compressing section or the pulsation-absorbing tank and is thus brought into light contact with the outer periphery of the nozzle.

Abstract: A pallet changer has a pallet support rotatably provided on a bed and a plurality of pallet inlet/outlets disposed on the edges of the pallet support at regular intervals. Positioning pins are biased such that they project from the bed toward the pallet support. Stops are provided on the pallet support and are engaged with the positioning pins, when the pallet support is turned through an angle corresponding to the angular distance between adjacent pallet inlet/outlets. A control mechanism is provided such that when a pallet is transferred to the pallet support through one of the pallet inlet/outlets, the positioning pin is held disengaged from the corresponding stop until the pallet support is rotated to the next stop position.

Abstract: A connecting member comprises a rod-shaped body having a head and/or thread on the outer periphery for integrally connecting a plurality of members and a containing hole opened at one end thereof and extended longitudinally, a rod disposed in the hole so as to fix at its inner end to the inner end of the hole, a transmissive window fixed to the opening of the hole, and a fluid holding member holding a colored fluid and pressed by the open side end of the rod on the window. When a longitudinal strain developed in the body the rod release the holding member from under pressure so that colored fluid covers the open side end of the rod.

Abstract: In a clamping apparatus, a pressing member is moved on a base in a vertical and horizontal directions by rotation of a bolt. The bolt is provided with a longitudinal hole open end of which is covered by a window. A rod is placed in the hole so as to fix the inner end thereof to the inner end of the hole. A transparent holding member holding a colored fluid is sandwiched by the open side end of the rod and the window. When a tension stress is developed in the bolt, the open side end is far away from the holding member so that fluid covers the open side end.

Abstract: A clamping device has a clamp base having a first clamping element. A second clamping element faces the first clamping element, which moves toward the first clamping element and cooperates with the first clamping element to hold an article. A shaft is rotatably provided in the crank base such that it extends substantially at right angles to the directions in which the second clamping member moves. An eccentric is formed on the shaft. A crank lever is supported at one end by a crank holder connected to the second clamp element and fitted at the other end on the eccentric. As the shaft rotates, the second clamping element is moved towards or away from the first clamping element so as to hold the article between the elements or release the article from them.