Abstract: A hand therapeutic appliance, including: a splint cloth with a portion for accommodating a palm with the fingers spread apart, and a portion for covering the underside surface of the carpal joint and forearm; retainers for releasably holding the five spread apart fingers; retainers for releasably securing the wrist and/or forearm to the forearm splint portion; a plurality of first generally delta-shaped pockets positioned between adjacent fingers; a pair of second pockets extending from the finger tips toward the forearm along substantially the full length of the splint cloth, the second pockets span the space between the thumb and the forefinger and the space between the ring finger and the middle finger, respectively; a pair of third generally delta-shaped pockets, one of the third pockets extending between the pair of second pockets from the finger tips toward the wrist to span the forefinger and the middle finger, and the other of the third pockets extending from the finger tips toward the wrist to span t

Abstract: A boring device includes a casing and an upwardly biased tool spindle supported in the casing so as to move in a feed direction and a return direction opposite thereto. A first thrust ring with a track surface is disposed coaxial with the tool spindle and is fixed thereto. A second thrust ring with a track surface is also disposed coaxial with the tool spindle and fixed to the casing such that the track surfaces of the first and second thrust rings face each other. A rolling element retaining ring is provided coaxially with the tool spindle between the first and second thrust rings and has bores circumferentially arranged at predetermined angular intervals. Rolling elements are fitted in the bores of the rolling element retaining ring such that the rolling elements roll on the track surfaces of the first and second thrust rings. Receptacles complementary to the bores are formed in the track surface of the first thrust member.

Abstract: A boring apparatus has a rotary member rotated by a motor, a transmission shaft transmitting its rotation to an electric drill by means of a rotation transmission mechanism for reciprocally moving the electric drill on the frame of the apparatus. The transmission shaft is selectively connected directly to the rotary member and connected operatively thereto through a coupling which is rotated reversely to the rotary member through a reduction mechanism and is designed to be disengaged from the transmission shaft when the shaft is directly connected to the rotary member and to be engaged with the shaft when the shaft is not directly connected to the roatary member. The apparatus has a selecting member which directly connects the shaft to the rotary member and disengages the coupling from the sahft.

Abstract: A drilling machine comprises an electric drill having a drill motor for rotating an annular drilling tool and a feed control motor for moving the annular drilling tool forward and backward with respect to a workpiece, both connected to an AC power source, and an electromagnetic base for fixing the electric drill on an object to be drilled.

Abstract: A boring device has a spindle moving mechanism which retards a tool spindle when the spindle rotates through a predetermined angle. The mechanism has coaxial first and second thrust rings. Thrust balls are disposed between the thrust rings in rolling contact therewith. A retaining element holds the thrust balls such that they keep constant circumferential spaces therebetween. The first thrust ring is fixed to the tool spindle and has recesses in the surface facing the second thrust ring. The second thrust ring is fixed to the casing of the boring device. As the first thrust ring is rotated by the tool spindle, the thrust balls are fitted in the respective recesses, whereby the tool retards by the amount equal to the depth of the recesses. Then, cutting edges of a cutter is separated from the face of a workpiece which is being cut, and a continuous chip is broken into pieces having a predetermined length and is removed from a hole being formed.

Abstract: An annular hole cutter is disclosed which has a plurality of cutting teeth disposed about a lower end of a cylindrical annular wall, each tooth having intersecting back-off surfaces, a first back-off surface inclining inwardly and a second back-off surface inclining outwardly. Teeth with high and wide cutting edges alternate with teeth having a low and narrow cutting edge, thereby reducing stress on the teeth, dissipating heat more effectively and preventing the blockage of the hole cutter by the cut chips.

Abstract: A tube coupling having a socket and a plug, each having a fluid flow passage extending therethrough, and a valve mounted in the flow passage of at least one of the socket and plug for axial movement between a first position for closing the flow passage and a second position for opening the flow passage said valve being normally biased towards the first position by a spring when the socket and plug are disconnected, and moved to the second position when the socket and plug are coupled together, characterized in that at least those portions of the socket and plug which will be exposed to fluid during the use are formed of fluorocarbon resin, the spring being disposed in said flow passage and comprising bellows made of fluorocarbon resin having continuous helically extending pleats.

Abstract: A cushioning device for use with a pneumatic impact tool which utilizes a part of compressed air for driving the piston of the tool as cushioning means and is self controllable.

Abstract: A heat pipe for a solar heat collector in which a header pipe is brought into fixed surface contact with a heat-radiation portion of the heat pipe formed of a heat-conductive material. A plurality of ribs are formed of the same material as the heat pipe and extend radially from a heat-collection portion of the heat pipe. A heat-conductive plate is provided contiguous to the ends of the ribs as a unitary piece. The heat-conductive plate may be positioned in surface contact with the rear side of the heat-collecting face of a solar heat collector pipe.

Abstract: An evacuated double-tubing solar heat collector including an inner tube, a selective absorption film applied over an exterior surface of the inner tube and an outer tube. The inner tube is constructed to be received within the outer tube and a spring ring is positioned on the inner tube for engaging an interior surface of the outer tube as the inner tube is inserted into the outer tube for spacing the inner tube relative to the outer tube. The spring ring is rotatably positioned on the inner tube to facilitate the insertion of the inner tube into the outer tube. Further, the inner tube includes an open end and the outer tube includes an open end which are fused to form a junction and hermetically sealed after the inner tube is inserted into the outer tube.

Abstract: A pneumatically-actuated multi-needle type chisel tool is provided having a hollow cylinder body, a piston ram fitted for axially reciprocal movement in a rearward portion of the cylinder body, an anvil fitted for axially reciprocal movement in an intermediate portion of the cylinder body, a needle holder fitted for axially reciprocal movement in a forward portion of the cylinder body and a number of needle chisels journaled for axially reciprocal movement in the needle holder. A first air passage is provided with an opening into the rearward portion of the cylinder body to introduce compressed air thereinto for moving the piston ram to and fro. A second air passage is provided with an opening into the forward portion of the cylinder body to introduce compressed air thereinto for moving the needle holder rearwardly.

Abstract: A pilot pin-locking means for a drilling machine including a drilling tool, a hollow shaft for supporting the drilling tool and provided with a lubricating means, a bearing means mounted on the drilling machine, the shaft being supported by the bearing means for vertical movement and rotation about an axis, further including a pilot pin inserted through the center of the drilling tool for vertical movement.The hollow shaft receives an engaging means that engages the pilot pin under the resilient action of a spring in a vertically movable manner. The engaging means is detachably locked to and biased against the inner face of the hollow shaft.

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.

Abstract: A drilling machine provided with an electromagnetic base comprises a first control system by which a warning device is actuated and/or a feed motor for automatically advancing an electric drill toward a workpiece is stopped when a load on the electric drill exceeds a prescribed first reference level while at work. A second control system further provided on the drilling machine is adapted to have the feed motor and/or the electric drill stopped when the load thereon is further increased and reaches a second reference level higher than the first reference level to assure high safety.

Abstract: An electrically-operated multi-needle chisel tool including a housing having a front portion and a rear portion. An electric motor is mounted in the rear portion. A cylinder extends forwardly from the front portion of the housing. A piston is disposed in said cylinder for reciprocable linear motion which is converted from the rotary motion of the motor. An anvil is axially slidably supported in the cylinder and positioned forward of the piston so as to be hit by the piston. A needle supporter is axially slidably supported in the cylinder and positioned forward of the anvil so as to be hit by the anvil. A number of needle chisels are individually supported by the needle supporter for axially slidable movement, and a return spring disposed in the cylinder for returning the needle supporter, the piston, the anvil and the needle supporter being adapted to be synchronously reciprocated by the motor. The piston includes a base portion and a reduced diameter shaft portion extending forwardly from the base portion.

Abstract: An instrument for recovering the functions of the carpal joint, the hand and the fingers including a ballonet operatively connected to an air supply for subjecting the ballonet to repeated expansion and contraction by feeding and discharging compressed air thereto. Finger-engaging members being provided on the outer surface of the ballonet. Fastening members being provided on the outer surface of the ballonet for fixation of the carpal joint region and the region adjacent thereto. An individual's hand positioned within the finger-engaging members and the fastening members is extended and fanned as the ballonet is inflated and contracted as the ballonet is deflated.