Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 4354226 | Communication terminal for interconnecting programmable controllers in a loop A communications terminal for use with a programmable controller to permit transmission of status and control information between that programmable controller and a plurality of programmable controllers having similar communications terminals associated t... | 10/12/1982 |
| 4180767 | Closed-loop regulating and overhauling load energy dissipating chopper type current control system for D.C. Motors A "chopper" type armature current control system for a D.C. motor when connected across the output of a rectifier, A.C. to D.C. type supply source that is characterized by having closed-loop regulating control, and having overhauling load energy dissipati... | 12/25/1979 |
| 4174143 | Bus duct joint employing lightly-loaded multiple-point electrical connector A single-bolt joint having louvered contact strips interposed the bus bars and conductor splice plates for improved electrical connection under low insertion forces is tightened to become a solid connector assembly prior to attachment to the bus bars of a... | 11/13/1979 |
| 4174472 | Pivoted-actuator switch with integral off-lock A pivoted-actuator switch having a switch operator including a pivotally-mounted contact actuator and a manually-grasped, removable operating lever or "key" snap-in mounted to the contact actuator for actuating the switch. A spring-biased pivotal lock bar... | 11/13/1979 |
| 4168416 | Guarded safety switch with integral off-lock and actuator non-removable in on position A pivoted-actuator safety switch of the type having a spring-biased lock lever within the sub-actuator that extends out to catch beneath the rim of the hole in the switch frame or housing to lock the pivoted-actuator in its "off" position, and a removable... | 09/18/1979 |
| 4166935 | Alternately-operable two-pushbutton switch An electric switch having two pushbuttons for rocking a pivotal actuator alternately in opposite directions for alternately closing double-throw contacts. The pivotal actuator is snap-in assembled to a switch frame which is snap-in assembled to a switch b... | 09/04/1979 |
| 4163136 | Snap-in means for mounting electrical devices or the like in a support panel aperture The snap-in mounting means includes a snap-in grommet carried on the shank of a bushing which extends from a switch frame mounted on a switch base of an electrical toggle switch assembly and pivotally supports a toggle lever for actuating switch contacts ... | 07/31/1979 |
| 4162388 | Apparatus and method for submerged percussion welding Submerged percussion welding is disclosed wherein the parts to be welded are in intimate contact with a liquid, such as water, during explosion and vaporization of the arc starter therebetween. In preferred form, one part is mounted to a stationary bottom... | 07/24/1979 |
| 4162386 | Method of and means for securing an electric switch operating lever in a one-hole mounting bushing A method of and means for securing a toggle type operating lever in place in an electric switch or the like. The lever is provided with integral trunnions that are fitted into pivot sockets formed internally in a switch mounting bushing. Tab portions part... | 07/24/1979 |
| 4160138 | Switch with indexing detent block A small toggle lever switch with positive position feel is disclosed. A toggle lever is pivotally mounted to a housing and has a shaft extending thereinto. Upper and lower plungers are slidably disposed on the shaft and are biased apart by a compression s... | 07/03/1979 |
| 4159483 | Low profile force indicating fastener, especially for semiconductor clamps A low profile semiconductor clamp with force indicating means is disclosed. A resiliently compressive spring washer, such as a belleville, is incentrically disposed within and bowed above an annularly larger indicator washer. The washers rest on a base me... | 06/26/1979 |
| 4158829 | Electromagnetically operated DC power contactor An electromagnetically operated DC power contactor for high voltage and current use constructed to afford the required contact pressure at the arcing and main contacts with minimal magnet force together with the provision of contact wipe and shearing and ... | 06/19/1979 |
| 4156804 | Snap-in means for mounting electrical devices or the like in a support panel aperture The snap-in mounting means includes a garter spring retained in an annular groove provided near the outer end of a bushing which extends from a switch frame on a switch base of an electrical toggle switch assembly and pivotally supports a toggle lever for... | 05/29/1979 |
| 4154997 | Miniature multi-contact pushbutton switch A pushbutton switch having an extremely small size for its number of contacts and capability. The switch has a tubular insulating housing with the snap-in pushbutton non-rotatably keyed in and extending through the upper reduced bushing end thereof for lo... | 05/15/1979 |
| 4151524 | Multipath communications system 3. The method of modulating a dispersed pulse signal by a temporally sequential series of intelligence elements, comprising the steps of: (a) producing a series of component signals each substantially identical with said dispersed pulse signal but delayed with... | 04/24/1979 |
| 4149053 | Safety disconnect electric switch A trigger switch for portable tools that provides safety disconnect under contact-weld conditions. The switch is a manual close, return spring open, double-snap type wherein the actuator acts on a double-inclined surface of a cam to snap the switch contac... | 04/10/1979 |
| 4149052 | Safety-disconnect power tool switch An electric power tool mounted switch that provides safety-disconnect under contact-weld conditions, and is of the manual close, manual open, or momentary (spring return), double-pole type having an actuator of the toggle lever, trigger or other suitable ... | 04/10/1979 |
| 4149049 | Switch using resilient annular contactor An electrically conductive annular elastic contactor is trapped in a cavity in a housing defined by a bottom wall and left and right side walls. A movable operator cammingly engages the contactor, compressively deforming it until an overcenter position is... | 04/10/1979 |
| 4149122 | Wideband tracking generator for harmonic mixing receivers A tracking generator for a wideband superheterodyne receiver in which a fixed-frequency signal source supplies an IF signal to a mixer for conversion to an RF signal at the frequency to which the receiver is tuned. A second signal is supplied to the mixer... | 04/10/1979 |
| 4146856 | Shutterless fiber optic switch A fiber optic reed switch is disclosed. A pair of fiber optic cables are mounted to the ends of cantilever reed arms by means of supports providing coaxial alignment of the cables upon closure of the reed arms to complete an optical circuit.... | 03/27/1979 |
| 4144410 | Multiplex communication system A reconfigurable serial loop multiplex communication system for communication of digital and analog status and control information between field terminal locations or to a central control location via a twisted pair line. Input modules in a first terminal... | 03/13/1979 |
| 4139755 | Snap-in bushing electric switch including a frame with integral back-up elements having panel-engaging ramped riser bars A toggle switch having a molded insulating frame mounting a snap-in bushing secured thereto for snap-in mounting of the switch in a hole in a mounting pane. This bushing pivotally retains the toggle lever for operating the switch contacts within the base.... | 02/13/1979 |
| 4138645 | Wideband signal calibration system A calibration system for a wideband superheterodyne receiver in which a fixed-frequency signal source supplies an IF signal to the mixer for conversion to an RF signal. The RF signal produced in this manner passes through the RF components of the receiver... | 02/06/1979 |
| 4138646 | Wideband absolute calibration system An absolute calibration system for a wideband superheterodyne receiver in which a fixed-frequency signal source supplies an IF signal to the mixer for conversion to an RF signal. The RF signal produced in this manner passes through the RF components of th... | 02/06/1979 |
| 4137490 | Trigger speed control switch A speed control subassembly is made by providing a generally flat heat sink plate having a laterally-formed collector strip at its upper edge. A double-sided-adhesive insulator tape strip is stuck to the heat sink, this tape having a hole large enough to ... | 01/30/1979 |
| 4135069 | Completely insulated toggle switch A toggle switch having an insulating housing that completely encloses all metal parts enabling connection of "live" wires to the switch terminals safely. The housing includes a molded base and a molded snap-in cover. A toggle lever supporting bushing is c... | 01/16/1979 |
| 4134080 | Low inductance resistor A low inductance resistor comprising a metalized, planar silicon wafer, positioned beneath the emitter tabs of an RF power transistor to provide dc balancing and stabilization and thus eliminate the need for more costly collector feedback circuits.... | 01/09/1979 |
| 4132933 | Electromechanical chopper for speed control of battery powered devices A chopper for adjustably controlling the average value of the voltage supplied from a D.C. battery source to a motor load for adjustable speed control. The chopper comprises manually-operable spring-biasing means for applying force to close a contact to e... | 01/02/1979 |
| 4132875 | Yarn detector switch with snap-on trapper A two-piece snap-on yarn trapper including a molded U-shaped bracket that snaps onto a yarn detector switch and supports a plural-turn helical spring. This spring is held inwardly bowed in the bracket so that the turns are held open or separated on the ya... | 01/02/1979 |
| 4127754 | Pivoting and sliding contactors and operating member therefor in electric switches Improved pivoting and sliding contactors and an operating member for lever and rocker operated electric switches are disclosed. A resiliently pivotally mounted forked operating member engages with the contactors adjacent opposite sides thereof and pivots ... | 11/28/1978 |
| 4123634 | Snap-action switch with contact wiping action An electric snap-action electric switch is disclosed which employs movable contact means having an inverted V-shaped cam surface. The movable contact means is spring biased into engagement along its cam surface with the end of a pivoted operator lever. Up... | 10/31/1978 |
| 4121072 | Snap-action overcenter switch having an apexed plunger depressible in a rockable actuator block A snap-action overcenter contact mechanism utilizes a spring-loaded apexed plunger depressibly cammed within a rockable actuator block. The plunger rides in tracks in the block which ensure registered pivotal movement of the block and plunger, and also gu... | 10/17/1978 |
| 4121069 | Snap-action electric switch with fulcrum means for limited contact sliding and positive-off torque An electric snap-action switch is disclosed having a movable contactor with oppositely inclined camming surfaces meeting at an apex on the top thereof. The contactor is centrally biased upwardly from below and cammed downwardly from above by a laterally m... | 10/17/1978 |
| 4121065 | Toggle switch lever lock An off-lock for a toggle switch of the type having a slotted guide plate and a spring-biased toggle lever having flats on opposite sides of the portion thereof extending through the elongated slot in the guide plate to confine the toggle lever for non-rot... | 10/17/1978 |
| 4119845 | Thermally-sensitive, photo-controlled semiconductor switching systems A switching system having a photo-sensitive power switching or control element such as a photo SCR, photo triac, photo transistor or the like that is normally turned on or off by coupled light from a controlled light source such as an LED (light emitting ... | 10/10/1978 |
| 4115673 | Current commutation means for illuminated switch indicator In the exemplary embodiment, an attachment is mounted to the switch housing and supports stationary supply terminals which extend through the switch housing to make sliding and wiping contact externally of the housing with the terminals of an indicator la... | 09/19/1978 |
| 4112458 | Silicon thyristor sensitive to low temperature with thermal switching characteristics at temperatures less than 50° C Thermally sensitive silicon thyristors capable of intrinsically switching between high and low resistance states in response to a predetermined temperature in the range -30° C to +150° C; this intrinsic switching temperature being not only lower than he... | 09/05/1978 |
| 4112282 | Snap-in means for mounting electrical devices or the like in a support panel aperture The snap-in mounting means includes a ring-like retainer member disposed in an annular groove provided near the outer end of an elongated bushing which extends from a switch frame member on a switch base of an electrical toggle switch assembly and pivotal... | 09/05/1978 |
| 4110720 | Thermostatic control A thermostatic control as shown and claimed in U.S. Pat. No. 3,135,849 in which the reed in this new disclosure has a pair of split legs. One leg of a first set of such pair is a flipper leg and the other leg of such first set carries a contact which is d... | 08/29/1978 |
| 4110585 | Grounded lever toggle switch EMI (electromagnetic interference) is prevented by grounding the switch operator. This is done by placing an electrically conductive spring brush within the switch housing to connect the toggle lever to the metal frame of the switch. Since the metal frame... | 08/29/1978 |
