Abstract: In an endless belt type grinding tool, a tension bar includes a front portion and a rear portion which are divided from each other in a tubular holding portion. The front portion and the rear portion forcibly abut against each other when the endless grinding belt wound around the drive pulley and the idle pulley is applied with a tension by the spring. The endless belt type grinding tool includes a locking member which, when the tension bar is pushed into the tubular holding portion against the spring, engages with the rear portion of the tension bar to retain the rear portion at the pushed position against the urging force of the spring. Thus, in a state in which the grinding belt is removed, it is possible to reduce damage even if the tension bar, which is being pushed in, accidentally jumps out.

Abstract: A pneumatic tool which can be easily assembled. This pneumatic tool includes a tool housing and an air supply pipe. The tool housing includes a motor housing having a tubular wall, and a tubular air supply/exhaust portion connected to the side surface of the tubular wall and extending rearwardly of the pneumatic tool. The air supply pipe has a valve unit, and is inserted into and set in the air supply/exhaust portion. The air supply/exhaust portion has an air supply passage extending from the motor housing. When the air supply pipe is inserted into and fixed to the air supply/exhaust portion, the forward end portion of the air supply pipe is communicated with a rear end opening of the air supply passage of the air supply/exhaust portion, whereby a compressed air supply passage to an air motor is formed.

Abstract: In an endless belt type grinding tool, a tension bar 18 includes a front portion 18-3 and a rear portion 18-4 which are divided from each other in a tubular holding portion 16. The front portion 18-3 and the rear portion 18-4 forcibly abut against each other when the endless grinding belt wound around the drive pulley and the idle pulley is applied with a tension by the spring. The endless belt type grinding tool includes a locking member 26 which, when the tension bar is pushed into the tubular holding portion 16 against the spring 24, engages with the rear portion 18-4 of the tension bar 18 to retain the rear portion 18-4 at the pushed position against the urging force of the spring 24. Thus, in a state in which the grinding belt is removed, it is possible to reduce damage even if the tension bar, which is being pushed in, accidentally jumps out.

Abstract: A pneumatic tool which can be easily assembled. This pneumatic tool includes a tool housing (18) and an air supply pipe (36). The tool housing (18) includes a motor housing (16) having a tubular wall (14), and a tubular air supply/exhaust portion (34) connected to the side surface of the tubular wall and extending rearwardly of the pneumatic tool. The air supply pipe (36) has a valve unit, and is inserted into and set in the air supply/exhaust portion. The air supply/exhaust portion (34) has an air supply passage (56) extending from the motor housing (16). When the air supply pipe (36) is inserted into and fixed to the air supply/exhaust portion (34), the forward end portion of the air supply pipe is communicated with a rear end opening (56c) of the air supply passage (56) of the air supply/exhaust portion (34), whereby a compressed air supply passage to an air motor is formed.

Abstract: In an open state of a valve, when a valve outside sleeve is rotated in the rear portion of a housing, a valve inner sleeve is moved forward to close a fluid channel, thus stopping supply of compressed driving air. Simultaneously, a front end of the valve outside sleeve is moved forward while it abuts against the rear surface of a retainer. Therefore, brake rods biased by compression coil springs are also moved forward, and front surfaces of the brake rods are abutted against a brake disk to effect braking, thereby immediately stopping rotation of a rotor. The urging force applied on the brake disk is the compression force of the compression coil springs.

Abstract: A handy air tool has a grip including a cylindrical tool holding section and a valve housing fitted therein. Both tool holding section and valve housing are molded from plastic material. Air supplying and exhausting passages are formed at the time of molding the valve housing and a hole for receiving a control a valve mechanism without requiring finishing. A least portion of air supplying ducts can be formed between the tool holding section and the valve housing. The tool is provided in the tool holding section with a locking mechanism comprising a hook portion extending from the free end of an operating lever toward the grip, and restricting elements for holding the hook portion so as to close a control valve member when it is necessary to keep the tool in a non-operating state.

Abstract: The air motor of the present invention has an air chamber for taking compressed air in a rotor body fitted to a rotary shaft, forms a jet hole opening in the tangential direction of the rotor on the periphery of the rotor, jets compressed air from the jet hole, and gives torque to the rotor by the reaction of the jetted air. An air reservoir is installed between the air chamber and the jet hole which are connected to the air reservoir. When the load of the air motor increases, the speed of the rotor instantaneously decreases. However, the decreased speed immediately increases because a lot of compressed air stored in the air reservoir continuously jets from the jet hole.

Abstract: A safety device for a pneumatic tool having a body and an operation lever and a valve stem lowered by the operation lever has an axially movable pivot shaft by which the operation lever is pivoted to one end of the main body of the pneumatic tool. A stop is formed on the pivot shaft so as to move between a resting position and an operating position together with the pivot shaft. A conical coil spring is provided to urge the operation lever upward by its torsional action and the stop as well as the pivot shaft toward the resting position of the stop by its compressive action. A receiving chamber is formed in the operation lever at a position where it coincides with the stop when the stop is moved to the operating position by the depressing of the pivot shaft. When, in this state, the operation lever is pushed downward to cause the stop to enter the receiving chamber, the valve stem is lowered and the operation of the pneumatic tool starts.

Abstract: A portable chamfering tool comprises a casing; a rotating shaft projected from one end of the casing; a ring-shaped connector arranged on the outer circumference of the rotating shaft, and having a ring-shaped groove formed on the outer circumference of the ring-shaped connector; a ring-shaped boss attached to the outer circumference of the ring-shaped connector so as to freely move in the axial direction of the connector; a guide plate attached to the ring-shaped boss; adjusting and fixing rings screwed onto the ring-shaped boss, the adjusting ring having a recess formed at the upper portion thereof; a connecting plate movably arranged in the recess of the adjusting ring and urged to the center of the ring-shaped connector to engage the ring-shaped groove on the outer circumference of the ring-shaped connector; a cutter chip fixed to the rotating shaft, which passes through the ring-shaped boss, with a part of it projected downward from the underside of the guide plate, and a guide attached to the rotating s

Abstract: A chamfering machine comprises a rotary shaft, a guide base provided perpendicularly to the rotary shaft, an adjusting unit for adjusting the relative positional relationship between the rotary shaft and the guide base, a cutter detachably mounted on the rotary shaft for chamfering the edge of a workpiece, a guide detachably mounted on the rotary shaft for contacting a lateral face of the workpiece and a fixing member for fixing the guide to the rotary shaft after the vertical positional relationship has been adjusted between the guide and the cutter.

Abstract: A chamfering machine comprises a casing, a rotating shaft projecting from one end of the casing, a ring-shaped connector enclosing the rotating shaft and having a slit formed parallel to the center axis of the rotating shaft, and also having a downward slope formed on the outer circumference of its lower end portion, a guide base having a ring-shaped boss detachably screwed into the ring-shaped connector, a lock ring detachably screwed onto the ring-shaped connector, the lock ring having an upward slope formed on the inner circumference thereof and slidable on the downward slope of the ring-shaped connector, when the lock ring is rotated and moved in the axial direction of the rotating shaft, to clamp the connector in the center direction of the rotating shaft, to firmly engage the connector with the ring-shaped boss, a cutting chip fixed to the rotating shaft which passes through the ring-shaped boss and having chamfering blades one of which partially projects from the underside of the guide base, and a guid

Abstract: A chamfering machine comprising a planar guide base, a rotary shaft extending at right angles to the guide base, upward and downward cutting edges attached to the rotary shaft and used to chamfer respective bottom and top edges of a workpiece, a first rotation guide located above the upward cutting edge so as to be in contact with a lateral face of the workpiece, a second rotation guide located below the downward cutting edge so as to be in contact with the lateral face of the workpiece, and an adjusting mechanism for retaining the cutting edges and the guide base for relative movement in the axial direction of the rotary shaft and adjusting the relative positions of the cutting edges and the guide base.

Abstract: A solar heat collector arrangement including at least one straight-tubing type solar heat collector and first and second frame members for supporting the straight-tubing type solar heat collector. A reflector mirror is provided for directing sunrays into the heat collector. The first frame member includes a round mount opening for receiving one end of the heat collector and the second frame member includes a semi-circular groove for receiving the other end of the heat collector. Resilient annuluses are mounted on each end of the heat collector for protecting the heat collector. The heat collector, the resilient annuluses and the reflector mirror are fitted one upon another into the opening in the first frame member and on the groove in the second frame member. A retainer is provided for holding the resilient annulus and the reflector mirror from above, the retainer is mounted for detachably connecting the heat collector relative to the first and second frame members.