Match Document Document Title
4283706 Puncture detecting device  
A tire puncture detecting device having a pressure chamber defined by a flexible diaphragm and held in communication with the interior of the tire, an atmospheric chamber communicating with the...
4274070 Proximity instant-on switch for medical and dental instruments  
A proximity instant-on switch for medical and dental instruments that includes a magnetically-responsive switch incorporated into the handle of the instrument and a permanent magnet embedded into...
4271338 Security apparatus  
A security device adapted for use with a slidable-type window or the like basically comprises a two-part electrical contact switch, one switch part being mounted on the molding surrounding the...
4242657 Electric connector  
An electric connector including, a female socket having at least one jack, a male plug assembly for coupling with the female socket and having a plug element thereby electrically engageable with...
4227163 Electrical keyswitch  
A low profile keyswitch for electrical keyboards is disclosed which has the capability of being operated either as a contactless analog type of keyswitch, or as a mechanical contact type of...
4219773 Well casing finder instrument with movable magnet and magnetically operated switch  
Instrument for locating the depth of the lower end of a mild steel or cast iron well casing or a plastic casing attached to a mild steel well screen has an elongated weighted body portion...
4213110 Proximity switch having adjustable sensitivity  
A magnetically operated reed switch device for use in physical security monitoring systems, machinery control systems, and the like, having a biasing permanent magnet associated therewith for...
4211990 Electric switch concealing hinge  
A hinge is secured to the jamb of a door frame and to a door in the frame. Behind the jamb leaf of the hinge the jamb is provided with a hole that is concealed by the hinge. The back of the jamb...
4211991 Magnet-controlled switch  
Magnet-controlled switch comprising in a case at least one flexible-strip interruptor (FSI) placed between two magnetic plates, one being movable with respect to the other under the action of a...
4210888 Magnetically operated proximity switch  
A magnetically operated proximity switch for use in physical security monitoring systems, machinery control systems, and the like, comprising a magnetic reed switch having permanent magnet biasing...
4209109 Tuber planter monitor  
A tuber planter employing a conveyor with feed cups to discharge seed tubers into a furrow and having an electromagnetic monitor thereon to signal the continuous operation of the conveyor is...
4205328 Apparatus for controlling a power source for an electrical alarm or indicator  
A key holding member of elongated shape having a rod of permanent magnet embedded therein or a sheet of permanent magnet adhered thereto, which, when put into its corresponding opening for...
4204180 End of paper roll detection assembly  
An end of paper roll detection assembly for detecting the end or near-end of a paper roll on a hollow core is provided. The end of paper roll detection assembly includes a detecting bar pivotally...
4203093 Solid state keyswitch arrangement  
A solid state keyboard comprised of a base module, a plurality of key members each having a plunger member comprised of a uniform mixture of a magnetic material such as barium ferrite and a binder...
4189692 Lock controlled power shut-off system  
A lock controlled power shut-off system provides for conserving power that would otherwise be wasted in an apartment building or the like by operating air conditioners or like power consuming...
4186362 Switch  
A switch employing such magneto-sensitive switching element as, for example, reed switch or the like and generally used for crime prevention purpose with a high reliability, wherein the switching...
4175348 Illuminated fishing lure with magnetic switch  
A fishing lure comprising a hollow body in which is encapsulated a solid state electric circuit, including light emitting diodes (LED's). Two LED's are seen through translucent eyes and a...
4170730 Multiple modular switch and wall plug  
A modular electric switch or wall socket comprises a pair of electrodes or screws inserted into a case to which are connected the terminals of electric current of the circuit it is desired to...
4161685 Solid state proximity switch  
A magnetic proximity sensing apparatus for sensing ferro-magnetic objects is especially well adapted for use with fluid cylinders having pistons formed from magnetically attracted material. The...
4150350 Magnetic switch  
A magnetic switch has a substantially closed casing. A conductive plate with an electrical contact is fixedly mounted in the casing. Another conductive plate has an electrical contact mounted...
4130745 Differential pressure threshold detector  
A differential pressure threshold detector in which a reed switch is arranged eccentrically in a housing which can be mounted on a housing containing an axially movable control magnet in either of...
4126841 Overcurrent switch  
An overcurrent switch is described, comprising a reed switch for series connection in an electric circuit to break the flow of an overcurrent therethrough. A magnetizing element applies a magnetic...
4117430 Keyboard switch  
A keyboard switch is actuated by the depression of a magnetized plunger into the region of a magnetic sensing device positioned at the lower extreme of plunger travel. The plunger is integrally...
4110768 Automatic film wind up device for a camera  
In an automatic film wind up device including a drive disc driven by an electric motor and a driven disc connected to a film wind up shaft and rotated by the drive disc, the drive and driven discs...
4107492 Pneumatic operated switch having movable flag, switch actuator mounted thereon, and switch in chamber displaced from measured flow path  
A pneumatic indicator device having a housing carrying a movable flag that in one position thereof visually indicates one pneumatic condition of the device and in another position thereof visually...
4104803 Direction finding device and guidance system  
A direction finding device employs a magnetic field sensor utilizing a vibrating magnetic reed switch with adjustable magnetic bias to vary the sensitivity or dead band. By sensing magnetic North,...
4103265 Fluid bilevel sensor  
A fluid bilevel sensor containing a differential float and a magnetically actuatable switch generating an electrical signal upon the occurrence of one fluid level. A thermal time delay delays the...
4094266 Elevator audible signaling device  
An audible signaling device for elevator cars of the type having an access opening and a door slideably carried by the elevator car and movable from a closed position to an open position. The...
4093835 Rotation sensor switch  
A protective device to provide a warning if a piece of rotating machinery slows or stops comprises a pair of hinged weights disposed to rotate on a rotating shaft of the equipment. When the...
4074095 Flow operable switch device  
A switch device having a housing connectible to a side wall of a flow conduit, a cup element dangling at the end of a string in the conduit is adapted under a predetermined pressure of fluid...
4072917 Switch actuating hinge  
A pivot hinge comprising a reed switch embedded in the leaf of a nonmagnetic pivot-jamb portion. The reed switch is located in the jamb leaf at an attitude to miss the mounting holes. A round...
4071725 Proximity switch for fluid cylinders  
The specification discloses a magnetic proximity sensing apparatus especially adapted for use with fluid cylinders having pistons formed from magnetically attractable material. The apparatus...
4068202 Reciprocable magnet switch  
Discloses a switch for use with a circuit board for simultaneously closing one or more circuits. A switch cover mounts therein a reciprocable member whose permanent strip magnet carries one or...
4057773 Magnetic switch  
A switch which can be activated by a magnetic force and which includes a housing having at least two spaced apart electrical terminals thereon. Internal of the housing is contained a coil spring...
4049986 Rotational speed to impulse frequency converter  
An apparatus for converting the rotational speed of a shaft, particularly of the driving shaft of a log propeller shaft into a proportional impulse frequency is provided with a rotary permanent...
4041427 Reed switching opening and closing device  
A reed switch opening and closing device comprises a reed switch having a pair of reeds with a contact therebetween operated by a change of magnetic flux. A magnet having N and S poles is movably...
4021855 Cassette detection device for recording and/or playback apparatus  
In a recording and/or playback apparatus for record carriers accommodated in cassettes, a detection device for determining the presence of a cassette in the apparatus in the correct position. The...
4012611 Inertia switch for anti-intrusion sensing systems  
An intrusion alarm system incorporating an inertially responsive sensor arrangement which, in one embodiment, is provided as a body of mass suspended in pendulum fashion within a compact housing....
4012731 Burglar alarm system  
The improved burglar alarm system of the present invention includes a housing which is secured around a doorknob rotatably mounted on a door. The doorknob shaft extends out through an opening in...
4011959 Bucket-positioner circuit with "no detent" operation  
In a loader vehicle having a bucket pivotally supported upon a lift frame, a tilt jack interconnected between the lift frame and bucket by tilt linkage and a detented control valve by which the...
4004271 Low tire pressure warning system  
A vehicle pneumatic tire low pressure warning system including a low pressure air switch carried on the vehicle rotating wheel assembly which compares a reference pressure and the tire pressure...
4001744 Electrical switch  
An electrical switch is disclosed which includes a first and second pair of pole pieces and an armature mounted to move freely between the first pair of pole pieces and the second pair of pole...
3993988 Intrusion detection apparatus to signal movement of a partition  
An intrusion detecting apparatus for an alarm system to signal breakage and movement of a door, window, or other movable partition comprises an elongated member forming an interior channel in...
3982217 Pressure-operated switch  
A nonexplosive pressure-responsive switch has a housing containing a chamber which is exposed to a source of pressure and a second chamber containing switch elements. A partition separates the two...
3973357 Door closer with switch actuated thereby  
A door closer has a case set in the floor and a rotatable spindle projected from the case. The spindle supports a door and rotates with the door as the door pivots between open and closed...
3974469 Permanent magnet biasing means for reed switches  
A magnetic switch assembly including a reed switch is biased by moving the magnetic axis of a permanent magnet with respect to the axis of the reed switch. In one embodiment, the magnet is a disc...
3961604 Magnetic trigger device for two group fuel injection system  
In a fuel injection controlled internal combustion engine, a magnetic trigger device provides the source of electrical timing signals for operating the injectors. A single rotating magnet has its...
3955112 Hermetically sealed rotor  
A hermetically sealed rotor as would form a component of either a single phase or a three phase electric motor. The rotor is positioned in close proximity to a conventional state of winding but is...
3951309 Device for detecting the quantity of remaining developer  
A device for detecting the quantity of remaining developer comprises a non-magnetic container for magnetic developer formed with a lower discharge port, a magnet disposed outside and adjacent the...
3950719 Proximity actuated magnetic button-contactor assembly for switches  
A miniature type hermetically sealed electrical switch that provides snap-action contact reversal with magnetic contact holding. The only moving part of the switch is a mechanically unattached...