Abstract: A switchable permanent magnetic chuck including a housing which has one open end and a face plate which covers the open end of the housing. The face plate comprises a plurality of elongated magnetic pole members and a plurality of elongated non-magnetic members, both members being arranged in an alternately juxtaposed manner. The permanent magnetic chuck further included a plurality of first permanent magnets each disposed between adjacent magnetic pole members of the face plate so as to give alternately inverted magnetized directions in the transverse direction of the magnetic pole members. In the housing is enclosed a movable member which is movable in the transverse direction of the magnetic pole members, and on the movable member are disposed a plurality of second permanent magnets in a corresponding relation to the magnetic pole members.

Abstract: A tire pressure alarm system primarily adapted for the monitoring of tire pressure in the pneumatic tires of coaxial dual wheels on a vehicle including a pneumatic cylinder mounted diametrically on the hub of the outboard wheel and having its end portions coupled by fluid hoses to the air valves of the respective inboard and outboard tires. The cylinder includes a reciprocal piston member normally biased to a axial central position defining air detector chambers at opposite ends of the cylinder for communication with the respective air valve stems. The piston member carries a pair of axially spaced switch elements movable with the piston member for actuating switch sensor elements spaced along the cylinder for generating alarm signals corresponding to predetermined tire pressures in the respective inboard and outboard tires. The pneumatic cylinders are substantially centrifugally balanced on the hub of the outboard wheel.

Abstract: A demagnetizing power source for producing an attenuation alternating field to demagnetize a magnetized substance. This power source is provided with a memory circuit for sending actuating signals to a polarity changing-over circuit to change over the polarity of direct current supplied from a rectifying circuit to an exciting coil. In the memory circuit are stored a plurality of preset demagnetizing patterns. The polarity changing-over circuit changes over alternatively the polarity and gradually decreases the change-over cycle according to the selected demagnetizing pattern.

Abstract: A switchable magnetic chuck has a magnet assembly slidably arranged in a casing to magnetize and demagnetize a top plate disposed in an open side of the casing. The top plate is provided with main pole members and auxiliary pole members which are arranged alternatively in the sliding direction of the magnet assembly, separated respectively by a non-magnetic separator disposed between them. To smoothen the change-over operation, enhance magnetic force under the magnetized condition and reduce residual attraction under the demagnetized condition, each main pole member is formed on the side facing the magnet assembly with an extension extending between the auxiliary pole member adjacent thereto and the magnet assembly.

Abstract: A magnet assembly used as a magnetism generating source for attaching an article to a magnetic substance or for magnetically retaining a magnetic member. The magnet assembly consists of a cylindrical casing open at least at one end, a core disposed within the casing at a spacing from an inner wall thereof, with one end of the core aligned with the open end face of the casing, and a permanent magnet disposed between the core and the inner peripheral surface of the casing. The permanent magnet has one magnetic pole on an outer surface thereof opposing the inner peripheral surface of the casing, and the other magnetic pole opposite the magnetic pole on an inner surface thereof opposing the outer peripheral surface of the core, so that the open end face of the casing and the end face of the core serve as a magnetic attraction surface.

Abstract: A device for separating a mixture material into a magnetic material, a nonmagnetic conductive material and a nonmagnetic nonconductive material. The device comprises a drum revolving in one direction about a longitudinal central axis thereof. The magnetic material of the mixture material thrown into the drum is attracted to the inner peripheral surface of the drum by the magnetism of a magnetic field surrounding the drum and rotating in a reverse direction to a direction of rotation of the drum, and released from the inner peripheral surface of the drum in a predetermined rotational region in the drum, thereby being received on a receiving member. The nonmagnetic nonconductive material is directed in the direction of rotation of the drum along the inner peripheral surface of the drum, and the nonmagnetic conductive material is directed in a reverse direction to the direction of rotation of the drum by the electromagnetic force of the rotating magnetic field.

Abstract: A switchable permanent magnet holding device in which a permanent magnet rotatably disposed within a bore in a magnetic circuit block is rotated, so that the magnetism acting surfaces of the magnetic circuit block are brought into an exciting state for retaining a magnetic substance thereon and into a non-exciting state for releasing the magnetic substance therefrom. The permanent magnet is pressed against a stopper for impeding rotation thereof, due to a gyromagnetic force acting across the permanent magnet and the magnetic circuit block when the permanent magnet is rotated to a position in which the magnetism acting surfaces of the block become exciting.

Abstract: A device for separating a mixture material into a magnetic material, a nonmagnetic conductive material and a nonmagnetic nonconductive material. The device comprises a drum revolving in one direction about a longitudinal central axis thereof. The magnetic material of the mixture material thrown into the drum is attracted to the inner peripheral surface of the drum by the magnetism of a magnetic field surrounding the drum and rotating in a reverse direction to a direction of rotation of the drum, and released from the inner peripheral surface of the drum in a predetermined rotational region in the drum, thereby being received on a receiving member. The nonmagnetic nonconductive material is directed in the direction of rotation of the drum along the inner peripheral surface of the drum, and the nonmagnetic conductive material is directed in a reverse direction to the direction of rotation of the drum by the electromagnetic force of the rotating magnetic field.

Abstract: An apparatus for separating a nonmagnetic conductive material from a nonmagnetic nonconductive material. The separation apparatus comprises a drum arranged in a tilted fashion and rotating in one direction about the longitudinal central axis and a chute for throwing a material being separated into the drum from the upper opening thereof. The material supplied through the chute into the drum is agitated by rotation of the drum, and the nonmagnetic conductive material of the material thus supplied into the drum receives an electromagnetic force produced by a magnetic field moving in a direction opposite to the direction of rotation of the drum, so as to be separated from the nonmagnetic nonconductive material. In order to increase the agitation effect for the material supplied into the drum, the chute is biased from the center of the upper opening of the drum to one side of the center depending on the rotational direction of the drum, and shoulder portions are provided on the inner peripheral wall of the drum.

Abstract: A magnetic base adapted to be secured to a magnetic substance attractively, wherein a permanent magnet 20 having a small reversible permeability .mu. is employed as a rotary magnet housed in a magnetic block 18 and rotated for switching magnetic active surfaces 24 of the block from an unexcited state to an excited state, thereby effecting a light and smooth rotation.

Abstract: A nonmagnetic conductive material separating apparatus designed for separation of conductive material from non-conductive material, comprising a drum composed of nonmagnetic substance and rotated in one direction around its longitudinal center axis, and means for generating a magnetic field rotated in the direction reverse to that of the drum. Composite input material posterior to previous removal of magnetic substance therefrom is introduced into the cylinder, and the nonconductive material contained in the entire input material is directed to the rotational direction of the drum along the inner wall thereof, while the conductive material is directed to the reverse direction by the electromagnetic force of the rotating-field generating means.