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4540964 Magnetic switch apparatus  
Magnetic switch apparatus which includes a casing having a magnetically sensitive component securely positioned therein in a predetermined location. The component may be in the form of either a...
4527217 Instrument protective device  
The disclosure generally relates to a protective device for an electronic instrument wherein input and output lines to and from the instrument are always isolated from calibration input and output...
4523083 Beverage warmer  
A beverage warmer assembly comprising a support unit having an electrically heated surface on which a beverage-container unit such as a cup may rest, the container unit and the support unit having...
4518835 Force responsive switch  
In response to a deceleration force, a rapidly reacting magnetic system causes a reed switch to change state. A predetermined time after the force ceases, a second, relatively slowly reacting...
4513271 Momentary contact magnetic switch  
A momentary contact magnetic snap action electrical switch (10) having a magnetic cover plate (12) with an aperture (14, 16) therein, a flexible sheet magnet (18) positioned in back of the cover...
4497988 Handlebar switch  
A handlebar switch is disclosed having a thin, flat, circular switch body with a centrally disposed opening therein to accomodate the handlebar. The switch body includes a removable segment to...
4491018 Pig detector  
The present invention includes a ferrous conduit mounted over an aperture in the pipeline, launch tube, or receiver through which the pigs pass. A non-magnetic sensing rod is reciprocally mounted...
4491792 Sensing switch for a magnetically coupled communications port  
A magnetically coupled communications port includes a switch for providing an enable signal upon coupling of a detachable magnetic coupler assembly to a fixed coupler assembly. The switch is...
4484041 Magnetically actuated electric switch  
A magnetically actuated electric switch with a bistable reed switch and with a magnet adapted to be moved past the reed switch within a channel; in its normal position the magnet adheres at a soft...
4481806 Detector for a meter prover  
A prover detector comprising a barrel having a longitudinal bore formed therethrough to receive a proximity switch mounted in one end thereof and a piston mounted in the other end thereof to...
4481389 Magnetic control device  
A magnetic control device having a movable, permanent magnet or fixed-polar portion, a movable element of magnetizable material, i.e., material of high permeability and a plurality of fixed...
4480833 Amusement game  
An electromechanical amusement game apparatus including a frame, a playing surface supported by the frame, at least one player element movable by a manually operated mechanism along an elongated...
4471180 Multi-circuit switch apparatus  
Electrical multi-circuit switch apparatus includes a flat flux plate and a pyramid-shaped magnet having a base and three or more triangular faces defining intersecting edges, outer edges and an...
4470833 Roll filter metering arrangement  
A metering arrangement for limiting the advance of the filter media in an automatic roll filter having a timer which periodically energizes a drive motor adapted to draw the media through the...
4465992 Double-pole double-throw proximity switch  
A magnetically actuated proximity switch is provided with a double-pole double-throw contact arrangement. To substantially equalize the contact pressures between the two poles a movable armature,...
4463312 Speed sensor device  
A speed sensor device incorporates a reed switch which is controlled by the changes in the density of the magnetic flux in response to the displacement of a permanent magnet. The device comprises...
4458226 Non-contact direction controller  
A manually actuatable direction controller includes a planar base supporting a number of magnetic reed switches, one of each direction in which control is to be exercised. The reed switches are...
4456897 Plunger-operated switch unit  
A plunger-operated magnetically actuated switch enclosed in a generally cylindrical housing which may be mounted either within a cylindrical cavity or against a flat surface. A magnetic contact...
4453148 Key switch  
The key switch comprises a housing with at least one permanent magnet accommodated therein, the magnet being rigidly connected with the key and adapted to act, when the key is displaced, onto a...
4419646 Electric proximity sensor  
An electric proximity switch of the type that is inserted into the cylinder wall of a hydraulic cylinder and is sealed tight with respect to the hydraulic fluid, the proximity sensor having a...
4414518 Vertical descent rate detector switch  
A vertical descent rate detector switch has a pair of contacts which are magnetically actuated when the rate of vertical descent of the switch exceeds a set amount.
4409577 Switch housing having recessed conductor terminals  
A housing for an electrical circuit component such as a magnetic contact reed switch for use in a security system. Clamps are provided for connecting the electrical component to conductors of the...
4389635 Interfacing attachment for remote mechanical fire alarms  
An attachment which converts a single station, spring powered, temperature sensitive, fire alarm protection device into a remote signalling heat detector for a central fire alarm system, without...
4371856 Switch assembly including circuit test points  
An assembly protectively housing an electrical component includes electrical test points connected to the electrical component and accessible by electrical test instrument probes to enable testing...
4359704 Device for setting up contact connections between independent electrical circuits  
A device for setting up a contact connection between independent electrical circuits, which comprises a plate made of magnetic material 1 on which is placed a sheet 2 of insulating material,...
4359719 Hall effect alarm pull station  
An alarm pull station is provided having a housing for attachment to a support, a manually movable member mounted within the housing and having a magnet attached thereto, and a Hall effect...
4357892 Apparatus for warning of the increase in draught of a floating article, especially a small boat, in a surrounding liquid  
Apparatus for warning of the increase in draught of a floating article, especially a small boat, in a surrounding liquid. The apparatus includes a signal emitter and a source of current which are...
4357585 Laminated magnetic switch  
A laminated reed switch assembly in which the reed is movable between two positions, in one of which it contacts two pole pieces.
4353049 Magnetically detented rotary switch  
A two position rotary type magnetically actuated reed switch (10) having magnetic detents is disclosed. The preferred switch includes a housing (12) having confronting magnetizable side walls (13,...
4350853 Alarm toe switch  
An alarm toe switch inserted within a shoe for energizing an alarm circuit n a covert manner includes an insole mounting pad into which a miniature reed switch is fixedly molded. An elongated slot...
4349800 Magnetic proximity switch  
An improved magnetic proximity switch which comprises an auxiliary permanent magnet for retaining normal closing and a yoke arranged so that the magnetic path of said auxiliary permanent magnet...
4346360 Low profile reed keyswitch  
A low profile reed keyswitch which includes a magnetically actuated reed switch. The reed switch is mounted parallel to the keyswitch base on a retaining fixture which resistively holds the body...
4342975 Magnetic return control key  
The invention relates to a control key, consisting of a fixed casing, a push-button mounted for sliding in the casing and magnetic means for returning the push-button to its rest position. The...
4336517 Revolution detecting device  
A device for detecting a revolution number of a connection shaft is disclosed. The device comprises a permanent magnet body attached to the connection shaft and a pulse generating means disposed...
4336518 Plunger operated magnetic contact switch assembly  
A switch assembly which has an actuating magnet, held in one of a plurality of intersecting cavities within a reciprocally movable plunger, and a magnetic reed switch located alongside one another...
4334204 Proximity switch assembly  
A self contained switch assembly of the type indicating the status of a moveable mechanical structure, such as a door being in proper position for latching, includes a proximity sensor mounted to...
4331945 Magnetically actuatable tamper switch assembly  
A magnetically actuatable tamper switch assembly comprising a housing of nonmagnetizable material as elongated in a longitudinal direction, wherein a plunger is operable to be longitudinally moved...
4330771 Pendulum switch  
An on-off switch that is activated by momentary application of an electromagnetic force to any tangent on the circumference, in the upper portion, of the units housing.
4328402 Sensing switch for detecting a document  
A document switch senses the movement of a plurality of cards, or the like, as they pass through a path of travel. A pivotable assembly has first and second pivoted arm members including a sensing...
4322703 Electrical switch and actuator therefor having both linear and angular adjustment therebetween  
An electrical switch and actuator therefor, arranged for relative movement. The switch is actuated in response to a predetermined positional relationship between the switch and actuator, with at...
4319712 Energy utilization reduction devices  
An energy conservation arrangement for a hotel guest room or other room lockable by a key (26) comprises a key reception module (10) disposed inside the room to receive a tag (24) of the key when...
4319236 Hall effect position detector  
A position detector providing an electrical position feedback signal proportional to relative mechanical movement between two elements employs a hall effect device to sense changes in magnetic...
4317969 Electrical line-connector  
An electrical line-connector device for safety application. The electrical contacts of the two-part line-connector which connect electrical conductors with one another are flush contacts, which...
4317016 Induction heating cooking apparatus  
A first portion of a top plate section of an induction heating cooking apparatus is used for placing a cooking pan thereon. A second portion of the same is used for controlling an output of an...
4316145 Fluid pressure actuator with proximity position sensor  
A fluid pressure actuator is disclosed of the type such as a hydraulic cylinder, having an arrangement for sensing the position of the piston and operating rod assembly at points within the...
4310797 Stud detector using a magnetically actuated switch with magnetic biasing  
The stud detector apparatus of the present invention automatically indicates the presence of nails and other ferrous fasteners beneath a wall covering, thus revealing the presence of a wall stud...
4301440 Level detecting device  
The level detecting device comprises a detector inserted in a reservoir to detect the level of oil liquid, lead wires leading signal from the detector, and a terminal connected to the lead wires....
4296394 Magnetic switching device for contact-dependent and contactless switching  
A magnetic switching device comprising a drive member and a slave member having magnetically attractive surfaces, the two members move angularly with respect to one another so as to bring the...
4292615 Switching element  
A switching element having a container made of insulating material, terminals extending from the inside to outside of the container, a mixture filled and hermetically sealed in the container, the...
4292629 Alarm system  
An alarm system signals an attempt at intrusion through an opening framed to receive first and second panel members movable between opening and closing positions, as specifically shown in the form...