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3729697 BISTABLE ELECTRIC SWITCH  
The invention relates to a bistable electric switch assembly of the type having an actuating permanent magnet pivotally mounted relative to a central axis and held in each of its stable positions...
3718877 SWITCH FOR PUSH KEY  
A switch for a push key of a calculator or the like comprising, a switch case with built-in members and a cover. Hooks projecting downwardly from the cover engage with edges of an upper flange of...
3715539 FLUID LEVEL MONITORING SYSTEM  
A fluid monitoring system wherein a float having a permanent magnet is disposed in a chamber containing fluid therein. The magnet is disposed on the bottom of the float. A hollow tube passes...
3710613 FLOAT OPERATED SIGNALLING DEVICE  
The invention is concerned with a float operated signalling device in which a magnet follows the movement of a float in a closed liquid container, the magnet reciprocating in a non magnetic tube...
3710369 OPENABLE ARCHITECTURAL FITTING WITH ALARM  
An openable architectural structure or fitting, such as a window or door assembly, having a stationary framework of a non-magnetic material with an aperture and a movable member adapted to close...
3707627 EMERGENCY TRIP APPARATUS FOR A BRAKING SYSTEM  
An electric trip switch device for railroad service utilizing a magnetic reed switch in proximity with a permanent magnet, which acts upon the reed switch. A magnetic conductor is adapted to move...
3704460 SELF-CONTAINED ALARM LOCK WITH TAMPER-PROOF INTERLOCKED CASING FORMED FROM EXTRUSION  
An integral self-contained, key-operated alarm lock, the major portion of the casing for which can be made from two longitudinally slidably tongued-groove interlocking channel extrusions, has an...
3701064 PUSH-BUTTON SWITCH  
This disclosure relates to a push-button switch comprising a housing provided with a support means for supporting a magnetic member, a reed switch element fixedly and vertically positioned in the...
3698531 SOLID STATE SWITCH  
The disclosure describes a keyboard switch having two magnetic cores and a plurality of permanent magnets. The permanent magnets are mounted on a keystem and are movable with respect to the cores...
3696359 INTRUSION ALARM SYSTEM  
A wireless point of entry intrusion alarm system having a central monitor and alarm cooperates with magnetically actuable entry detectors placed at potential entry locations. Each sensor is...
3696380 PORTABLE ALARM DEVICE  
A portable alarm device with a battery or low voltage operated sound signal triggered by a magnetic reed switch which is closed to complete the circuit by a magnet attached to a movably mounted...
3691490 MAGNETIC SWITCH APPARATUS  
A magnetic electric switch comprising a sealed body of electrical insulating material forming a cavity, fixed contact members having one end located within said cavity and the other end located...
3675340 ELECTRO-MECHANICAL EDUCATIONAL APPARATUS  
An electro-mechanical educational apparatus in the form of a solid tablet representing one side of a house, complete with detachable windows, shutters, and windowboxes. Each detachable window...
3676812 PLUNGER OPERATED REED RELAY SWITCH  
The invention relates to a plunger operated reed relay switch module that incorporates a novel permanent magnet and mounting for the magnet which permits the plunger which operates the magnet to...
3675169 DURABLE ELECTRICAL SWITCH  
A manually operated switch having a sealed cylindrical housing is controlled through a pivotable, radially extending external actuator member and contains a pair of magnetically actuated sets of...
3673526 MAGNETIC SWITCHES AND METHOD AND APPARATUS FOR MAKING SAME  
Pushbutton switch in which a coiled return spring holds a magnet in a socket of a pushbutton and against a roll pin which is accessible after assembly for slidable adjustment to fix the position...
3656181 MAGNETICALLY OPERABLE MOMENTARY SWITCH ASSEMBLY  
A magnetic flux field momentarily produces a first reed switch mode upon movement of a permanent magnet to a selected position and aspect in response to depression of a self-restoring manual...
3654601 VEHICLE TIRE PRESSURE WARNING SYSTEM  
For detecting a reduction of pressure in the pneumatic tire of a vehicle. A magnet device is mounted for rotation with the vehicle wheel to pass in close proximity to a magnetically operated...
3648117 MAGNETIC DEVICE  
Transmission of electric signals from a primary coil to a secondary coil can be effectively controlled by moving a magnet to and from a magnetic core of ferromagnetic substance, such as iron, or a...
3644855 KEYBOARD REED SWITCH  
A pushbutton keyboard switch embodying an enclosed reed contact element mounted on a base portion of a switch in close proximity to a permanent magnet that is movably supported between a pair of...
3639868 MAGNETIC SWITCH MOUNTING MEANS FOR A FLUID MOTOR UNIT  
An adjustable form of magnetic reed switch mounting means which utilizes a movable arm member in a slotted track member adapted to be mounted along the exterior cylinder wall of the air cylinder...
3638180 ALARM FOR SIGNALLING TIRE MALFUNCTION  
A permanent magnet is mounted on each wheel of an automotive vehicle. In case of low pressure in one of the vehicle tires, the external magnetic field of the magnet mounted on the wheel for that...
3637986 ELECTRICAL UNIT HAVING A MAGNETIC SWITCH CONNECTING A CORDLESS ELECTRIC POWER APPLIANCE TO A CHARGING APPLIANCE  
An electrical unit having a connecting means for a cordless electric power appliance whose terminals are brought into contact with the corresponding terminals of a charging appliance, having a...
3635678 CLOT-TIMING SYSTEM AND METHOD  
A system and method is provided which has the general capabilities of measuring the speed of coagulation, congealing or solidification of a fluid sample, and which has particular utility in the...
3636485 SECURITY ALARM SYSTEM  
A security alarm system for protecting restricted access areas against entry by unauthorized personnel. A switch operated by the opening of a gate or door in a wall surrounding the protected area...
3636484 SPRINGLESS SWITCH CONSTRUCTIONS FOR USE IN THE PROTECTIVE CIRCUIT OF BURGLAR ALARM SYSTEMS  
A conductive permanent magnet structure fixed on the frame of a protected opening, attracts into contact with itself, a conductive loosely slidable armature having limited movement on the closure...
3636370 CONTACT-FREE PUSHBUTTON SWITCHING DEVICE  
A permanent magnet having a pole shoe is affixed to a moving device for moving the magnet in directions transverse to the axis of magnetization of the magnet and into and out of close proximity...
3634635 APPARATUS FOR DETERMINING THE LOAD ON A WHEEL AXLE IN A VEHICLE  
An axle load detector comprises a post carrying at least one magnetically operated switch at a local position along its length, a separate body incorporating a magnet for operating the switch and...
3632923 FLOW-RATE SWITCH  
A flow-rate switch particularly suited for use in detecting variations in flow rates for fluids flowing through conduits of pressurized systems characterized by the utilization of a magnetically...
3627958 MAGNETIC HORN SWITCH  
In a steering wheel hub, rim and rib assembly, appliance-operating means including a switch in the hub, electrical circuitry connecting the switch to an appliance, magnetic flux generating means...
3627959 MAGNETIC LATCHING AND SWITCHING  
A door latch and magnetically actuable switch includes an H-shaped permanent magnet and pole assembly for both latching and switching having a first pair of pole ends that are shunted by a striker...
3626340 REED SWITCH ASSEMBLY EMPLOYING A MAGNETIC SCREEN  
A reed switch (for example, for a keyboard controlling a transmitter) is controlled by a reciprocable high-permeability collar which can be slid axially onto the reed to screen the latter from a...
3622922 ELECTRIC PUSHBUTTON SWITCH  
A pushbutton switch comprising a casing and a base mounted therein for relative movement. The base has thereon a submagnetic pole plate and a Hall element for electrical connection to a switching...
3622926 MAGNETICALLY ACTUATABLE REED SWITCH ASSEMBLY  
A reed switch assembly of the type comprising a pair of spaced-apart flexible magnetically permeable electrically conductive reeds adapted to contact each other when brought into proximity to...
3621415 PRECISION REED-TYPE SNAP SWITCHES  
An improved precision-type snap switch with the same package and operating characteristics as a conventional precision-type snap switch, and having magnetically actuated reed switches providing...
3621417 MAGNETICALLY RESPONSIVE SWITCHING APPARATUS  
Magnetically responsive switches are provided which have contacts which are normally open or normally closed or sets of contacts which are respectively closed and open. In those switches having...
3619523 APPARATUS FOR AUTOMATIC CONTROL OF TOW TAKEUP MEANS BY DETECTING THE AMOUNT OF TOW ON CONVEYOR  
Apparatus for automatically detecting changes in the amount of tow on a conveyor and thereby automatically controlling the start or stop of the operation of tow takeup means and maintaining the...
3613038 MINIATURE PUSHBUTTON DRY REED SWITCH  
A precision-type snap switch embodying a reed-type switch providing sealed contacts, and a printed circuit board supporting the reed-type switch and conductively connecting selectively the sealed...
3611219 ELECTRIC SNAP SWITCH  
An electric snap switch having a snap-acting mechanism for shifting a permanent magnet to operate a reed switch which is always positioned within the effective magnetic flux of the magnet so as to...
3601727 MAGNETIC SNAP ACTION SWITCH  
A combination spring and magnetic snap action switch of the momentary type. It employs spaced-apart pairs of stationary contacts and a movable contactor which are formed of magnetic materials. A...
3601729 SWITCH ASSEMBLY  
A switch assembly for use in an environment requiring automatic switch operation under certain conditions, as when the switch assembly, or the body on which the switch is mounted, is tilted or...
3601728 PRINTED CIRCUIT KEY IMPROVEMENT  
Magnetic reed switches have their operation strokes standardized by locating the reeds in variable positions relative to a magnet affixed in a movable structure depending upon their individual...
3598933 ELECTRICAL MULTIPOSITIONAL SWITCH ARRANGEMENT  
An electrical multipositional switch arrangement is disclosed having a rotatable switching wheel and at least one stationary circuit board or plate possessing contact tracks for the purpose of...
3599132 PERMANENTLY POLARIZED REED SWITCH  
A reed switch comprising a permanently polarized reed; at least two temporarily polarizable reeds; one of the polarizable reeds which when not polarized being in contact with the permanent...
3590397 AUTOMATIC FLUSHING DEVICE FOR TOILET FACILITIES  
An automatic flushing device for a toilet, wherein the flushing of water is controlled by a switch so disposed as to be actuated by a lid mounted on the toilet bowl so that when the lid is opened...
3587012 MAGNETICALLY ACTUATED DETECTING AND SWITCHING DEVICE  
A car-detecting device is suggested in which a plurality of permanent magnets are symmetrically mounted on a support member to define a common magnetic axis. A shaft on the support member has a...
3586888 IMPACT TRANSDUCER SWITCH  
An impact transducer switch includes a manually operable key, an energy storage spring, and a piezoelectric element. Upon actuation of the key, means is provided for moving said spring through a...
3585322 DIGITALLY OPERABLE MAGNETIC REED SWITCHES  
A magnetic reed switch is operated in a digital switching mode with one state established by positioning a magnet at a stable position which holds the contacts open by passing equal magnetic flux...
3585545 PROXIMITY LIMIT SWITCH  
This specification describes a proximity electrical limit switch which is operated by a change in magnetic field strength caused by passing a metal cam or other object in the proximity of...
3579159 PUSHBUTTON MAGNETIC REED SWITCH  
A novel reed switch assembly provided with a ceramic bar magnet as the switch actuating means is disclosed. The structure of the novel reed switch is characterized by the arrangement of the...