Abstract: A non-retrieval tool with a magnet connected a handle by a linkage assembly. The linkage assembly can be adjustable to maintain an orientation or position based on manipulation of a user, and can be made of a non-conductive material to safely operate in electrical applications. In some embodiments, the tool can include a socket portion near the magnet to apply torque to work pieces.

Abstract: An electromagnetic attachment apparatus includes a power supply, an electromagnet module, and a rotatable module. The electromagnet module includes a coil and a core positioned in the coil. A mounting panel is attached to the core. A pair of electrically conductive blocks is attached to the mounting panel, and connected to the coil. The rotatable module is rotatably attached to the mounting panel, and includes a pair of electrically conductive pins connected to positive and negative electrodes of the power supply respectively. The rotatable module is rotatable to a first position in which the electrically conductive pins thereof contact the electrically conductive blocks for attaching a metal object, or a second position in which the electrically conductive pins thereof disengage from the electrically conductive blocks for releasing the metal object.

Abstract: An exemplary magnetic clamp holder used for a mechanical arm, includes a housing (21), a magnetic structure (22), and two positioning pins (25). The housing includes an attaching portion (211), and a joining portion (213) fixed to the attaching portion, the attaching portion and the joining portion cooperatively defining a receiving cavity (218). The positioning pins are disposed on the attaching portion of the housing. The magnetic structure is received in the receiving cavity. The magnetic structure includes a permanent magnetic module (223), an electro-magnetic module (225), and a magnetic shield plate (227) disposed between the permanent magnetic module and the electro-magnetic module. The electro-magnetic module is able to create a magnetic field for neutralizing a magnetic field created by the permanent magnetic module.

Abstract: A switch type ON/OFF structure for hoisting magnetic disks has a handle turnable towards one side to demagnetize and towards another side to generate a magnetic force to attract and move a work piece. The handle is hinged on one end surface of a hoisting magnetic disk which also has a first detent member and a second detent member. The first and second detent members can stop the turning of the handle. The handle further has an extensible latch member at one side spaced from the handle at a selected interval. The latch member has a distal end slidable over the second detent member and extendable downwards to allow the second detent member to be wedged in the interval and anchored. Thereby the hoisting magnetic disk can provide the magnetic attracting force and hoist and move the work piece safer.

Abstract: A magnet assembly for attaching to nails, bolts, metal shavings and other magnetic-conducting objects. The magnet assembly includes an elongate housing having side and end walls, and also having openings in the end walls; and also includes an assembly of producing magnetism including coiled wires being disposed in the elongate housing, and also including a battery being disposed in the elongate housing and being connected to the coiled wires, and further including an on/off switch being movably mounted to the elongate housing and being connected to the battery and to the coiled wires; and further includes at least one magnetizable tool being removably received through one of the openings of the elongate housing for picking up small objects.

Abstract: A manually manipulatable magnetic card encoder containing substantially all of the apparatus and wiring required to encode magnetic spots on a magnetic card key or the like. The encoder is relatively small and includes a housing provided with a pistol grip to facilitate manual manipulation of the encoder.