Abstract: An electromagnetic circuit breaker has a housing that includes a separately defined arc chamber in which the moving contact travels as the breaker is tripped, and the chamber has a divergent shape to facilitate exhausting the hot gases from the arc chamber through a metal screen and through vent openings in the end wall of the breaker housing. The housing is made in two half sections that are held together by rivets and the location of one of these rivets is isolated from the fixed contact at the lower end of the arc chamber by the unique arc chamber configuration. The lower wall of the circuit breaker housing is adapted to receive either a molded switch subassembly or to receive a terminal strip that is held in place by the primary terminals of the breaker and is adapted also to support auxiliary terminals that operate a shunt coil. The shunt coil itself is fitted on a bobbin that is selectively mounted on the bobbin that contains the primary electromagnetic coil fo the breaker.

Abstract: An individual telephone subscriber circuit module for use with laminar type connector blocks employing conventional three-element gas tubes of diameter greater than the thickness of an individual lamina. The module houses two gas tubes in side-by-side relation and straddles two adjacent laminae on the block to protect a pair of adjacent circuits.

Abstract: A circuit breaker terminal strip has an offset spade terminal end segment and a conventional lug terminal segment formed integrally so that one or the other or both types of wire connectors can be used with a single terminal. The lug receiving segment has a threaded opening to receive a screw that holds the lug and its wire in alignment with the terminal. The spade segment is integrally connected to the lug receiving segment and configured to receive a quick connector so that the wire on the latter does not interfere with the wire with the lug.

Abstract: A DIN rail mounted circuit breaker case has a housing that includes a rear or back side for receiving one flange of the channel shaped rail. A one piece molded plastic latch is provided in a cavity defined by the housing and can be moved from its latched position to an unlatched position by inserting a screwdriver in a slot and bending a stem portion of the latch.

Abstract: A telephone connector block with slotted openings and having shaped wire guide elements located in said slotted openings particularly suited for bracket or cradle type installation with or without a wall-mounted backboard. This block offers total front administration with the possiblility of rear connection for cutover and test access by temporarily disconnecting the block from the cradle. Improved strain relief is obtained by threading the individual conductors into angularly configured passageways leading to front mounted quick clip connectors.

Abstract: A method of removing obstructions lodged in the pharnyx and/or larnyx of a victim, including the steps of providing a suction device incorporating a rigid hollow tongue depressor having suction means at a free end thereof; inserting said tongue depressor to a point wherein the free end is adjacent an area in which the obstruction is located; applying suction to the free end to dislodge the obstruction and retain it on the free end, and maintaining the suction while withdrawing the tongue depressor and the obstruction engaged thereon.

Abstract: A split case breaker housing has a depending well at the bottom and any one of three different filler blocks can be assembled with the split case sections to provide a convenient receptacle for a limit switch or for auxiliary studs, or to simply close the opening provided in the well for these filler blocks.

Abstract: A telephone connector block having improved means for temporarily retaining the ends of individual subscriber pairs adjacent the open ends of quick-clip connectors prior to engagement therewith using an installation tool. This is accomplished by a strain relief means which engages an individual conductor as the same is bent to substantially a right angle relative to the axis of the opening in the adjacent quick clip terminal whereby upon bending the end of the conductor and the engagement of a short projection on the strain relief means, the conductor remains in desired position prior to full engagement with the quick-clip terminal.

Abstract: A high density front administered telephone protector block having three terminal connection surfaces disposed on three sides of the block. The block is mounted on an inner end by a rearwardly extending bracket. A first side surface mounts protector modules, an oppositely disposed second side surface mounts outside plant wire wrap pins for connecting subscriber pairs. A third outer end surface extends transversely past the side surface and mounts quick clip terminals for cross connections.

Abstract: A protector block for connecting plural individual telephone subscriber circuits adapted to replace existing nonstandard installations to enable usage of standard protector modules is disclosed.

Abstract: A test shoe adapted to engage a discrete area on a telephone connector block, normally mounted upon a telephone main frame for the purpose of interfacing with a plurality of individual subscriber circuits appearing on the block, either directly, or through protector modules. The establishment of communication with each subscriber circuit involves the engagement of a large number of contact prongs with corresponding circuits, creating substantial frictional contact tending to retain the shoe in position. Means is provided for facilitating the disengagement of the shoe after completion of testing procedures, whereby the friction is conveniently overcome, and the shoe disengaged in a direction perpendicular to the plane of the connector block.

Abstract: An improved telephone protector module for individual subscriber circuits of generally planar configuration, and having heat-sensitive means employing a solder pellet which, upon melting, flows through capillary action to effect a shorting to ground. Secondary air gap means is provided by spacing a pair of conductive parts using a thin insulative wafer having openings therein forming an interruption in the insulation.

Abstract: An improved combination wire installation and cutting tool for installing the ends of telephone circuit conductors into known quick clip connectors, following which the stubs on the free ends of the conductors are cut to predetermined lengths, so as not to interfere with adjacent conductors. As contrasted with prior art devices of this type, the tool does not require the free ends of the conductors to be inserted into holes in the tool, and the tool has a cutting element which can sever the stubs on the conductors before the conductors are fully seated in the quick clip connectors.

Abstract: An improved guide means for conductors passing through a telephone connector block in which the conductors are prevented from becoming bunched or unidentifiable. The guide means includes a plurality of slidably engaged tray-like elements, each providing channels for a plurality of conductors connected to terminals in a given horizontal plane, the tray-like elements being serially insertible into corresponding recesses in the block as the block is progressively wired.

Abstract: A replacement type gas tube protector for use with an older type telephone protector block utilizing a bayonet lug type engagement. The original carbon block protection is replaced by a gas tube element of smaller dimension, a conductive washer, and an insulative washer having a conductive sleeve. The conductive washer and gas tube element form a primary air gap means. The conductive washer and the insulative washer form a secondary air gap means.

Abstract: A gas tube protector device for individual telephone subscriber circuits including a secondary air gap means which becomes operative in the event of gas tube failure with accompanying voltage surge.

Abstract: An improved gas type telephone protector module in which the firing of a heat-sensitive means causes a slidably mounted ground plate to bypass in both circuits to the flow of excess current and/or voltage surges to ground. Means are incorporated to provide a secondary air gap which becomes operative upon the failure of either chamber of the gas tube.

Abstract: A protective module of the type used in building entrance terminals having substantially greater heat sensitivity than prior art types, thereby offering protection against sneak currents which are not sufficiently large to activate conventional solder pellet heat sensors. Use is made of a bobbin type heat sensor, the thermal inertia value of which may be varied to alter sensitivity.