Abstract: Electromagnetic reciprocating pump including a plurality of pumps combined in such a manner that the mode of connection between the suction inlet and the discharge outlet in each of the pumps is allowed to be changed and, as the result, the amount of suction or discharge or the degree of vacuum or compression is allowed to be selected at a multiplicity of stages without any loss of the energy of the alternating current power. The plurality of pumps are disposed in such a manner that the axes of their respective pistons intersect one another at one point and the pumps themselves are rotationally symmetrical with respect to the point mentioned above.

Abstract: An annular hole cutter including a barrel and cutting teeth attached to a lower portion of the barrel. A portion of a cutting edge of the cutting teeth including hard teeth each having an outer cutting edge formed into a segment which is concentric with respect to an outer circumferential surface of the barrel and an inner cutting edge formed into a segment which is eccentric a slight distance with respect to an inner circumferential surface of the barrel in the radial direction. Eccentric regions of the hard tooth project from the inner circumference of the barrel in the centripetal direction. A gullet is defined between adjacent edges of the cutting teeth for the removal of chips. An inner peripheral surface of the hard teeth located above a stepped portion of the gullets each being formed into a segment which is concentric with respect to the inner circumferential surface of the barrel, and has the same radius of curvature as that of the inner circumferential surface.

Abstract: A therapeutic appliance for improving the functions of an individual's carpal joints, hand and fingers includes a palm splint cloth shaped so as to accommodate a hand with its fingers spread apart. Finger retainer members are disposed on the front surface of the splint cloth for holding the fingers individually in their spread apart positions. A plurality of first bladders are disposed on the front surface of said palm splint cloth and positioned between each adjacent fingers except between the thumb and forefinger in a palmiped configuration for spreading the fingers apart form each other. A plurality of second bladders are disposed on the opposite surface of said palm splint cloth for extending the fingers, hand and the carpal joint and fluid supply and discharge tubes are connected to the first and second bladders for supplying and discharging fluid to and from the bladders.

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.

Abstract: Web-like triangular sacs are disposed between the finger stalls of a glove-shaped body to fan the respective fingers by feeding compressed air into the sacs. A plurality of sacs are arranged on the palm portion of the body, each running from the relative stall toward and along an arm portion. When compressed air is fed into the latter-mentioned sacs, the hand and the carpal joint are extended. Charging or discharging of compressed air into or out of the sacs may be carried out simultaneously or selectively with a given cycle. By repetition of the cycle, rhythmical intermittent movement, such as fanning and extension, of the functionally disordered carpal joint, hand and fingers takes place passively for the remedy of flexion contraction and extension disturbance, and a primary factor which can induce active movement is produced.

Abstract: In the construction of an electro-magnetic fluid pump such as an air pump in which a piston assembly carrying an armature is driven for reciprocal axial movement due to operational combination of magnetic attraction generated by a stator core and mechanical spring repulsion for cyclic discharge of the fluid out of its piston chamber, the piston assembly is postively supported on both axial sides of the stator core and a pneumatic spring is incorporated within the piston assembly. Biased movement of the piston assembly and bias in the magnetic attraction are both successfully prevented in order to minimize undesirable abrasion of the piston assembly and its related parts.

Abstract: A massage machine has a massage head pneumatically driven for high frequency vibration and a liquid reservoir from which liquid, e.g. hair liquid, is forcibly discharged by simple finger action for dispersion through the massage head nose concurrently with the massage action. Uncomfortable noise trouble caused by air discharge is minimized by forcing the drive air to undergo repeated volume changes during the discharge thereof through the machine.

Abstract: In an electromagnetic fluid operating apparatus such as an air compressor in which a piston with an armature axially reciprocates along a path substantially at a right angle to the magnetic flux generated by a stator core due to alternate operation by electromagnetic attraction and mechanical repulsion, exact collimations are automatically established between the armature and the stator core and between the piston and a cylinder for the piston when they are assembled together, thereby minimizing biased frictional abrasion of coacting sliding surfaces. Provision of an internal air reservoir at the air outlet terminal effectively reduces pulsation of air supplied by the apparatus.

Abstract: In a closed-type compressor with an electromagnetic reciprocating drive, reliable and stable collimation of the electromagnetic driving part with the compressive pumping part is easily established by a snug engagement of fitting seats provided in the coupling plane of the two parts and lubrication of the piston and its related part is effected by a built-in type lubrication mechanism utilizing the flow of the gas returning from the given circulation system with simplified construction as well as in the case of compressors with rotary drive, the compressor being preferably used for cooling systems.