Abstract: An interchangeable electrical connector includes a connector body and an adapter body. The connector body includes electrical contact means, such as a banana plug tip, for engaging an electrical terminal. The connector body includes a conical portion and a threaded portion which is coaxial with the conical portion. The adapter body includes a conical portion which is shaped for co-operative engagement with the conical portion of the connector body, and a threaded portion which is coaxial to the conical portion of the adapter body. The threaded portion of the adapter body is for cooperative engagement with the threaded portion of the connector body, such that cooperative rotation of the connector body relative to the adapter body draws the conical portion of the connector body into engagement with the conical portion of the adapter body. The wedging action of the two conical portions frictionally engages the connector body to the adapter body.

Abstract: An electrical connector is set forth which is suitable for connection to a conductor which includes a connector member suitable for attachment, for example by soldering or by a crimping device, to a conductor, such as a cable. The electrical connector also includes a terminal pin connectable to an electrical receptor or terminal, for example in a part of an audio system. The connector member also includes a threaded part onto which any one of several types of alternative connector units may be mounted to enable use of the same conductor and its attached connector with different types of audio system receptors or terminals. A right-angle adapter may also be used to join the electrical connector to one of the alternative connector units.

Abstract: An electrical plug is set forth including a first blade in electrical association with a first electrical conductor member and a second divided blade associated electrically with a plurality of first and second electrical switch wires, wherein a resilient polymeric insulator strip is formed between the first and second divided blade portions to provide a plurality of switched electrical wires directed from the divided blade structure permitting electrical switching of the switched wires. The insulative member is formed to ensure securement of the plug member within the associated electric outlet. An electrical receptacle apparatus is set forth including a first slot in electrical association with a first electrical conductor member and a second slot with two electrical conductors associated electrically with a plurality of first and second electrical switch wires permitting electrical switching of the switched wires.

Abstract: A device for intensifying light images which includes an image intensifier tube assembly that is retrofittable to two different existing housings. There is a first electrical contact for electrically connecting to electrical supply contacts when positioned in the first different housing and a second electrical contact for electrically connecting to electrical supply contacts when positioned in the second different housing. The tube assembly has first spacer for effecting a predetermined spacing between the tube assembly and the first housing when positioned in the first housing, and a second spacer for effecting a predetermined spacing between the tube assembly and the second housing when positioned therein. The first spacer is inactive to control spacing when in the second housing and the second spacer is inactive for controlling spacing when in the first housing.

Abstract: The invention proposes a connecting plug device for electrical equipment and more particularly rows of solenoid valves in the case of which on one side of a housing there is a contact arrangement for cooperation with an arrangement of mating contacts on the item of electrical equipment. On two further sides of the housing there is a respective set of electrical plug connecting contacts. One plug connecting contact is connected with one plug contact of the contact arrangement and at least one further plug connecting contact is connected with the corresponding opposite plug connecting contact and with a further plug contact electrical, while the remaining plug connecting contacts are connected with the plug connecting contacts arranged offset in relation to the respective opposite plug connecting contacts.

Abstract: A control apparatus for a battery pack having two power receptacles coupled to an electric circuit that includes a switch for selectively delivering power to the receptacles. The control apparatus includes (1) a structure for retaining the receptacles a predetermined distance apart; (2) a cover moveable on the retaining structure so as to selectively expose a selected one of the receptacles while simultaneously covering the nonselected one; and (3) a protuberance coupled to the cover for engaging the switch and translating movement of the cover into operable movement of the switch.

Abstract: A telephone speaker/microphone device for suspending in a user's ear to enable hands-free communication without common occurrence of feedback. The device utilizes control circuitry capable of interconnecting microphone and speaker leads from a telephone or other communicating device to a speaker element and microphone element which are embodied in a single earpiece and suspended at the user's ear. The speaker element and microphone element are positioned sufficiently close and are wired such that the speaker signal is approximately 180 degrees out of phase with the microphone signal and results in cancellation of feedback by virtue of the out of phase relationship. This device and method are particularly useful in communication devices which utilize a side tone electronically transmitted from the microphone into the speaker element at the user's ear.

Abstract: An auxiliary male twist-lock plug-adapter for converting a female twist-lock plug-adapter to male. The male adapter is a disc defining an upper and a lower face. Three twist-lock electrode-prongs project from the upper surface, and three conventional electrode-prongs project from the lower surface. Either of the two sets of three prongs may be coupled to the female twist-lock plug adapter so that the other, uncoupled set may be connected to a conventional female plug or to another female twist-lock plug adapter.

Abstract: A modular power-line attachment cord has a plug with standard pins in a cavity with a locking shoulder. A number of national-standard inserts have cooperating sockets for the pins, and a locking shoulder allowing the insert to be permanently captured in the cavity of the plug.

Abstract: A standard sized multipole connector for the transmission of electricity therethrough, which connector has plural concentric contacts and structure for preventing shorting when connected to a connector not having a concentric array of contacts.

Abstract: A convertible connector which may be either a male or female pressfit connector uses a common metal shell that is reversed depending upon whether a male or female connector is used, and which receives one of two different insulators depending upon the type of connector to be made. The insulator is used to press fit the terminal pin into the printed circuit board, and a standard prior art male pressfit terminal pin is used with a metallic tube fitted over one end of the male pressfit terminal to adapt it for use in the convertible connector.

Abstract: The connector assembly includes (1) a pair of connectors (300,300') for respectively terminating the individual conductors of a pair of multiconductor cables (200,200') and (2) a pair of adapters (500,600) that are respectively electrically connected to the connectors. The adapters come in different configurations and are user interchangeable to permit connection to external connectors having particular configurations.