摘要:
A pair of insulating base halves (26,28) are adapted for mutual engagement along respective open sides, one base half (26) containing stationary contacts (30,32,34) and an electrical bussing element (30) structurally interlocked with that base half upright against an interior wall and the other base half containing a speed control circuit board (40) disposed in an upright position along an opposite interior wall and electrical connectors (56,58) biased into electrical engagement with the circuit board and forming push-in lead connectors with the stationary contacts and bussing element, a movable contact carrier (38) disposed between the base halves for sliding movement and having a movable contactor (64) engaging the stationary contacts and a wiping contact (66) engaging variable resistance (44,46) elements on the printed circuit board, the two base halves being interlocked (26k,28e) together along a lower edge and retained together along an upper edge by inserting them into a hollow housing (2) containing a depressible trigger operator (4,18) the insertion effecting a driving connection (18d,38k) between the movable contact carrier and an internal member (18) of the trigger operator, the internal member having a shaft (18a) projecting through an opening (2b) in an end wall of the housing which has a seal retaining cage (2c) formed thereon around the opening (26) the internal member being retractible to position the end of the shaft (18a) flush with the end wall for permitting a seal (22) and seal retaining cap (24) to be inserted to said cage, and an external trigger operator member (4) affixed to the end of the shaft, the external member having an interlocking structure (4d) formed therein for cooperation with a reversing switch lever (14) which overlies the external trigger operator member and has a depending projection (14d) engaging the interlocking structure (4d) in a center position to prevent depression of the trigger.
摘要:
A control center characterized by a metal enclosed upright cabinet having a plurality of vertical bus bars therein, which bus bars are separately insulated and isolated from each other. The assembly of the bus bar and insulation barriers is supported and reinforced by a plurality of vertically spaced braces to prevent lateral movement of the bus bars as well as to hold the insulating barriers in tight surface-to-surface contact with the bus bars.
摘要:
A panelboard front assembly including a trim plate having an opening for exposing a panel assembly mounted in a box, clamping bars slidably attached to the trim plate for engaging flanges of the box, and a door attached to the trim plate which conceals the clamping bars and the associated adjusting means when closed. In the illustrated example, side rabbets are provided on the trim plate and the clamping bars slide in openings in the rabbets and have adjusting screws which slide in slots in the rabbets. The clamping bars are further spring-loaded toward the open position by springs situated proximate the adjusting screws.
摘要:
A hand-held device for controlling the operation of powered equipment by the natural movements of an operator''s thumb is provided. The device has a lower portion which is gripped by the fingers of one hand and an upper, control portion having selected control members which are within ready reach of the thumb of the hand holding the device.
摘要:
A switch device comprising a control member and a plurality of hollow bodies containing the electrical contact elements; said bodies being provided with resilient lugs or projections suitable for association in corresponding seats formed on the control member or on said bodies for successive connection thereof according to one or more predetermined directions.
摘要:
A switch system using a plurality of multi-contact reciprocating switch plungers to selectively connect any one of a plurality of multi-conductor lines running in one direction to any one of a plurality of multi-conductor lines running in a transverse direction with each plunger switch unit and its cooperating contacts being made in a module whereby a switch system of any number of switches can be readily assembled, particularly for the purpose of connecting any one of a plurality of transmitters to any one of a plurality of directional antennas for directing radio waves in a particular direction as required. Provision is made for shielding the conductor lines, whether a multiconductor line or a single conductor line, by means of shielding channels arranged with their backs in supporting engagement and fixed together providing the framework for the switch system. Suitable insulators are provided for supporting the multiconductor or single conductor lines in proper relation and the plunger switch unit serves to make the necessary connections without leaving an objectionable line stub on the energized portion of the lines.
摘要:
A housing of modular construction, preferably for use in solid state unit pole relays, comprising a multi-purpose molded cap capable of being used either by itself in pairs to form a complete enclosure for the circuitry of a power pole of a solid state relay, or in pairs in conjunction with a central core to form the enclosure for the circuitry of a driver unit of a solid state relay.
摘要:
A conduit fitting for attaching pendent light fixtures to an overhead conduit line comprises first and second members respectively attachable to the conduit line and the fixture, wherein the members have complemental mating tongue and groove portions enabling convenient sliding assembly of the members for positively securing the fixtures to the conduit line. Removable cover members selectively close open ends of the grooves to restrain relative movement between the members and provide selective access to a wiring compartment formed between the members for permitting inspection of electrical wiring connections.