38results about "Permanent magnet contact switches" patented technology

The electrical switching device comprises at least a first part comprising at least a first magnetizable element and a first contact zone associated with said first magnetizable element, and at least a second movable part comprising at least a second magnetic element and a second contact zone associated with said second magnetic element. The first or second magnetic element comprises at least one permanent magnetization part to keep the first electrical contact closed and to exert a contact pressure between the first and second contact zones when the movable part is in a first stable position. The electromagnetic relay and / or electrical apparatus comprise electrical contact inputs and control inputs connected to a switching device comprising electromagnetic control coils.

A tamper detection switch is disclosed primarily for use in an enclosure of a security system component. The enclosure has a base and a cover that may be repositioned relative to the base. One of the cover and the base holds a conductive magnetic element free to translate within a predetermined range generally perpendicular to the respective cover or base. The other of the cover and the base holds at least two ferrous metal contacts of an open tamper circuit in proximity of a conductive magnetic element. In the closed position the conductive magnetic element bridges the ferrous contacts and closes the tamper circuit. Attempts to tamper with the enclosure separate the ferrous contacts from the conductive magnetic element, opening the tamper circuit and signaling a possible attack.

A magnetic switch (10) for detecting relative movement between first and second members (12, 14) is provided which includes a switch assembly (20, 50, 70) for mounting in one of the members (12, 14), an attractive component (22, 54, 76) for mounting on the other member; the assembly (20, 50, 70) preferably includes plural switch elements (40, 26, 70, 56, 92, 80) and a conductive, shiftable body (44), whereas the component (22, 54, 76) is magnetically attractive to the body (44). The first switch elements (40, 70, 92) are preferably formed of a magnetically attractive material while the body (44) is fabricated from permanently magnetized material, so that the body (44) remains permanently magnetically coupled with the element(s) (40, 70, 92) in all positions of the body (44). Alternately, the switch assemblies (20, 50, 70) can be used as proximity detectors so as to generate a signal in the presence of an adjacent ferrometallic or permanently magnetized object (108).

A universal magnetic switching assembly for detecting relative movement between first and second members, the universal switching assembly mounted on a bracket that may be used to adjust the positioning of the magnetic components relative to each other on opposing members to maintain the operational gap between the opposing magnetic components.

Tamper-resistant switch assemblies (26, 162) are provided including a first movement-sensing switch (28) and a second tamper-sensing switch assembly (30), the latter including a switchable component (32) and an actuating component (34). Preferably, the switch (28) and switch assembly (30) are housed within an encapsulated switch module (70, 114, 164), with the actuating component (34, 118, 138, 166) positioned above or to the side of the module (70, 114, 164). Mounting structure (36) serves to support the module (70, 114, 164) within a mounting opening (90, 112, 148) and is operable to prevent removal of the switchable component (32) and actuating component (34, 118, 138, 166) without significant relative shifting movement between the switchable component (32) and actuating component (34, 118, 138, 166). Any attempted tampering results in such relative shifting movement, thereby triggering an alarm.In another aspect, the invention provides switch apparatus (182) including a magnetic ball switch (32) with a first biasing magnetic component (194) and a second operating magnet component (196). Adjustment structure (190, 192) permits selective adjustment of the position of magnetic component (194) in order to permit tuning of the apparatus (182) so as to prevent defeat thereof by means of a defeat magnet (198) positioned between the magnet components (194, 196).

Switch apparatus (10) includes a switching assembly (16) and an operating component assembly (18) respectively designed for mounting upon relative shiftable members, such as a door (12) and frame (14). The assembly (16) includes a magnetic switch unit (30) having an elongated housing (40), first and second spaced apart switch elements (36, 38), and a shiftable, electrically conductive body (50) within the housing and movable between a first switch state where the body is in simultaneous contact with the switch elements (36, 38), and a second switch state where the body is not in such simultaneous contact. In order to prevent unauthorized opening of the relatively shiftable members through use of an external defeat magnet (62), the switch unit (30) is mounted substantially horizontally rather than in an upright or oblique orientation.

Switch-controlled security assemblies (20, 76) are provided which are especially designed for use with cargo enclosures (40), in order to detect any unauthorized opening of the cargo doors (38). The assemblies (20, 76) include one or more switch assemblies (26, 28) each having a switch member (44) and an associated shiftable component (46). In preferred forms, the switch member (44) includes a pair of switch elements (50, 52) and a body (54) movable between a first position in simultaneous electrical contact with the elements (50, 52), and a second position out of such simultaneous contact. The body (54) and components (46) are magnetically coupled such that movement of the component (46) during unauthorized opening of door (38) effects corresponding movement of the body (54), in turn actuating an alarm controller (30).

A simulated eye is provided. The tilt switch comprises an electrically insulating housing with a chamber formed therein. The chamber is defined by a bottom surface and a surrounding surface. The tilt switch also includes a plurality of contact terminals, each of which comprises an inner terminal portion and an outer terminal portion. Each inner terminal portion protrudes out of the surrounding surface of the chamber and extends in a direction substantially parallel to the bottom surface. The tilt switch further includes an electrically conductive moving member placed in a space defined by the cap, the bottom surface, and the plurality of contact terminals. The electrically conductive moving member is capable of simultaneously contacting with at most two of the plurality of contact terminals.

Small, low-profile magnetic switch assemblies (26, 76, 126, 168) include a base (38, 78, 156) equipped with first and second laterally spaced apart switch electrodes, indentations (62, 102, 158) between the electrodes, and electrically conductive movable components (72, 110, 166), which are magnetically shiftable between a first switch position in simultaneous contact with the base electrodes, and a second switch position out of such simultaneous contact. The switch position of the component (72, 110, 166) is determined by the magnetic field conditions experienced by the component (72, 110, 166). The indentations (62, 102, 158) and associated shiftable components (72, 110, 166) permit the assemblies (26, 76, 126, 168) to be constructed as comparatively tiny units, which may be mounted on circuit boards.

A magnetic switch includes: a housing; a cylinder coupled to an inner side of the housing; a stationary contact arm coupled to the housing; a movable contact arm positioned to be movable within the housing and brought into contact with the stationary contact arm or separated therefrom; a coil assembly installed within the housing and configured to form a magnetic field when a current is applied thereto; a movable shaft coupled to the movable contact arm in an upper portion thereof; a fixed core inserted into the cylinder and surrounding the movable shaft; and movable cores fixed to the movable shaft and configured to press the movable shaft by a magnetic field formed by the coil assembly to move the movable shaft.

In an electromagnetically moving device 100, a magnetic-flux variation measuring unit 3 is placed at a position which is outside a closed magnetic path established when a movable core 6 and a stationary core 5 are being attached to each other due to permanent magnets 7, and at which a leakage magnetic-flux variation due to movement of the movable core 6 can be measured, so that a behavior of a movable part in a switch, etc. is estimated such that an inflection point time is calculated from the measurement of time-series data of the magnetic-flux variation.

An improved magnetic switch assembly (16) has a housing (24), a first electrode (40) positioned within the housing (24), a second electrode (42), and a magnetically movable component (48) located within the housing (24) and shiftable between a first position in simultaneous contact with electrodes (40, 42), and a second position out of such simultaneous contact. The electrode (40) has a radially enlarged contact section (44, 58) adjacent the free end thereof which prevents hangup or sticking of component (48) in the first position.

The application provides a micro switch. The micro switch comprises a shell, a moving contact and a static contact which are arranged in the shell, and a reset magnet. The moving contact is a first magnet, and the first magnet moves towards the side close to the static contact under the action of the closing force so that the moving contact point of the moving contact is connected with the staticcontact point of the static contact. The reset magnet is arranged in the shell and is used for applying a magnetic field force for resetting the first magnet to the first magnet. After the closing force is removed, the first magnet resets under the action of the magnetic force, so that the moving contact point is separated from the static contact point. In the scheme, the moving contact, the static contact and the reset magnet will not deform and will not generate fatigue stress due to deformation in the connection and separation processes of the moving contact point and the static contact point. Therefore, compared with the mechanical micro switch in the prior art, the micro switch has a longer service life and better sensitivity and hand feel of touch.

The invention relates to an electromagnetic actuator for operating at least one movable contact of a switch into a switched-on position or a switched-off position, wherein the electromagnetic actuator comprises: -a static pole body; -a movable pole body movable relative to the static pole body; -a first magnetic circuit comprising a first coil for making the movable pole body and the fixed pole body move towards each other to a switched-on position and a second coil for making the movable pole body and the fixed pole body move away from each other to a switched-off position; and -a second magnetic circuit comprising a permanent magnet and a retaining plate to keep the static pole body and the movable pole body in the switched-on position; -first spring means for urging the static pole body and the movable body away from each other; wherein the first and second magnetic circuit are arranged concentrically.

Switch apparatus (54), designed to detect relative movement between first and second members (60, 62), includes a switch assembly (48) comprising a switch unit (20), a biasing element (50), and an operating member (52). The unit (20) has a conductive housing (22) with first, second, and third electrical pin contacts (36-40) and a shiftable body (46). The body (46) is magnetically correlated with both the element (50) and operating member (52). When the members (60, 62) are close, the operating member (52) maintains the shiftable body (46) in one switch position, whereas when the members (60, 62) are separated, the biasing element (50) magnetically moves body (46) to another switch position, thereby detecting the relative movement).

The invention discloses a magnetic induction variable-speed switch device comprising a frequency conversion circuit controller and a magnetic induction control switch. The frequency conversion circuit controller has a magnetic control integrated circuit. The magnetic induction control switch comprises a pedestal, a rotating shaft, a rotary knob, and a permanent magnet. The pedestal is fixed to a motor shell, and is provided with a through hole. The rotating shaft is rotatably arranged in the through hole. The rotary knob is fixed to an outer end of the rotating shaft. The permanent magnet is fixed to an inner end of the rotating shaft and directly faces the magnetic control integrated circuit. The permanent magnet is a rare earth magnet of which the magnetic induction intensity is 1 Tesla. By rotating the rotary knob, the permanent magnet rotates along with the rotating shaft to change the direction of magnetic field. Control on the magnetic control integrated circuit is realized as the direction of magnetic field changes, and thus the frequency conversion circuit controller controls the rotation speed of the motor. By using the device of the invention, continuous variable speed and reverse rotation of the motor can be achieved. The switch is a non-contact magnetic induction control switch, the overall design reaches the Chinese explosion-proof standard, and the safety coefficient is higher.

The invention provides an automobile door and window elevating switch assembly, which relates to automobile switches, and comprises a base and a housing connected to the base. A PCB circuit board is disposed between the base and the housing. The PCB circuit board is provided with a pin and a fixed contact pair electrically connected to the pin. The housing is provided with a button. The PCB circuit board is covered by a conductive rubber plate, which arches upwardly and elastically at the part corresponding to the fixed contact pair, forming a movable contact disconnected from the fixed contact. The invention is advantageous in that the noise of contact contacting is low with the use of the automobile door and window elevating switch assembly, and the problem of the prior art that the noise of contact contacting is loud can be resolved.