US1956859A - Electrical resistor - Google Patents

Description

y 1934- E. A.. EVERETT 1,956,859

ELECTRICAL RESISTOR Filed Dec. 22, 1930 INVENTOR.

Patented May 1, 1934 UNITED STATES PATENT OFFICE EH'ICTBICAL nssrs'ron Edward a. Everett, Long Island City, N. Y. Application December 22, 1930, Serial No. 504,155

7 Claim.

This invention relates to electrical resistors, that is, to a device which is connected into an electrical circuitwith the object of increasing the resistance in the circuit. An object of the invention is to provide mountings for a resistant material in a variety of forms and which may be conveniently adjusted. Other objects of the invention will appear from the following'specification and the accompanying drawings, in which,

Fig. 1, shows one form of this invention constructed from a plurality of resistance units in which the resistance may be varied by bringing one or more units into circuit; Fig. 2 is one form of connector strip that may be used to bridge the terminals in Fig. 1; Fig. 3 is an elevation, partly sectioned, corresponding to Fig. 1; Fig. 4 is an end elevation, partly sectioned, corresponding to Fig. 3 and Fig. 5 is a modification of the arrangement shown in Fig. 1.

The resistor illustrated in the drawings show an adjustable form of resistor that is built up from multiple units to the capacity desired. A porcelain base '15 is provided with binding posts 76 and 77 which clamp the connector strips 78 an insulating sleeve 81 and with insulating collars 81a at each end so that it is disconnected from the circuit. On the sleeve 81 the resistor units 82, 83, 84 and85 are mounted and are spaced by metallic washers 88 and by the upstanding connector strips 86 provided with the terminals 87. The end strips 86 are directly connected with the supporting strips 78 and 79 and the conductors may be connected to these outer terminals 87 or to the terminals '76 and 7'7. The resistance of this device can be varied by bridging over certain of the units or connecting them in multiple circuit and a connector strip similar to 89, Fig. 2 may be used for this purpose.

In order to facilitate these connections the connector strips 86 are rotatably mounted on sleeve 81 and may be deflected as indicated at a and b in Figs. 1 and 4. In this way the termi-' and '79 respectively. The bolt 80 is provided with poses, preferred to resistances of the coil type. They are mechanically stronger and are not materially injured by lightning discharges nor fused by heavy currents.

Having thus described my invention, I claim:

1. An' electrical resistor comprising a shaft, a plurality of resistor units mounted on said shaft, a terminal strip mounted on said shaft between each of said units and carrying a terminal-screw,

.means for connecting said resistor into an electric circuit and means for freely aligning said terminal strips whereby one or more of said units may be bridged by a straight bridging piece without interfering with intermediate terminal strips.

2. An electrical resistor comprising a shaft, a sleeve of insulation on said shaft, resistor units mounted on said sleeve, a terminal strip mounted on said sleeve between each of said units and being freely rotatable thereon whereby any particular pair of terminal strips may be individual- 1y aligned, a link for connecting said strips and means for connecting said resistor into an electric circuit. V

3. An electrical resistor comprising a shaft, a sleeve of insulation on said shaft, resistor units mounted of said sleeve, a terminal strip mounted on said sleeve to .rotate freely thereon between each of said units and having a projecting end bent over at a right angle and provided with a binding post, a link for connecting'a plurality of said binding posts and means for connecting said resistor into an electric circuit.

4. An electrical resistor comprising a shaft, resistor units mounted on said shaft, a terminal strip having a projecting end mounted on said shaft between each of said units, said terminal strips being similar in form and being freely ro- 'tatable on said shaft whereby any pair of projecting ends may be brought into alignment and located to avoid the projecting ends of the other intervening strips and a link for connecting said aligned strips.

5. An electrical resistor comprising a shaft, resistor units mounted on said shaft, a terminal strip mounted. on said shaftbetween each of said units, each of said strips having a projecting portion with a portion of said projecting portion having a terminal screw bent parallel with said shaft, said strips being freely rotatable on said shaft whereby any pair of terminal strips may be brought into alignment and located to avoid the other terminal strips and a link secured by said terminal screws for connecting said aligned terminals.

a pair of L-shaped brackets clamped to said base through slotted openings in said brackets, a shaft mounted on said brackets, a plurality of resistant units mounted on said shaft between said brackets and terminal strips mounted on said shaft between said resistant units, said brackets being adjustable to the number of said resistant units on said shaft by changing the position of said L-shaped brackets on said base and by clamping said brackets through the slotted openings to said base.

EDWARD A. EVERETT.

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