US2542113A

US2542113A - Helical resistor

Info

Publication number: US2542113A
Application number: US77136A
Authority: US
Inventors: Bowitz Harlan; Stanley S Fishfader
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-02-18
Filing date: 1949-02-18
Publication date: 1951-02-20
Anticipated expiration: 1968-02-20

Description

Feb. 20, 1951 H. BOWlTZ ETAL HELICAL RESISTOR Filed Feb. 18, 1949 i W 6. A 6 Mn m m O 1% AM /WM)".

A APMA 50/4072, 5744 15/53 WWI/10M,

' 4rrmw Patented Feb. 20, 1951 HELICAL RESISTOR Harlan Bowitz, Los Angeles, and Stanley S. Fishfader, Wilmington, Calif.

Application February 18, 1949, Serial No. 77,136

2 Claims.

This invention relates to a helical resistor and the object of our invention is to provide a resistor of helical shape, in which there is a greater length of windings on the resistor body than in devices heretofore devised.

Another object of our invention is to provide a device of the character stated, which is simple in construction, easy to assemble, and which is effective to vary resistance over a wide range.

A feature of our invention is to provide a novel helical resistor in Which the terminal contacts are simply attached and are effective in the manner in which the contact is made.

Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description and the appended claims.

In the drawing:

Figure 1 is a rear elevation of our resistor with only a portion of the windings shown in position.

Figure 2 is a sectional view taken on line 2--2 of Figure 1.

Figure 3 is a fragmentary sectional view taken on line 33 of Figure 1.

Figure 4 isran elevation taken in direction of line 4-4 of Figure 3.

Figure 5 is a sectional view taken on line 5-5 of Figure 1.

Figure 6 is an elevation taken in direction of line 6-6 of Figure 5.

Our helical resistor A is mounted on the rear face of a panel 4 and extends at right angle to this panel. A shaft II is rotatably mounted in the resistor A and extends through the panel 4 and this shaft is rotated by means of a knob 2, which is secured to the shaft by the set screw l. A tube l2, formed of insulating material, is fixedly mounted in the panel 4 by means of the nuts 3 and 5, which are threaded on the tube and bear against the front and rear faces of the panel 4, respectively. The shaft H extends through the tube l2 and is journalled therein.

The helical or spiral body 1, which is also formed of an insulating material, such as porcelain, or the like, is fixedly mounted on the tube 12, in that the tube fits within the center of the body I and the nut also bears against the bottom of the body, thus holding it in position.

For the purpose of this explanation, the dimension extending at right angles to the panel 4 will be called the width of the spiral body 1. The wire windings 8 are wound over the width of the body 1 and these windings are continuous from the outside to the inside of the spiral body.

With this arrangement, it is possible to mount a great length of wire on the spiral body and still maintains the horizontal and vertical dimension of the resistor within reasonable limits.

A contact arm I9 is mounted on the inner end of the shaft H and the outer end of this contact arm is curved, as shown at It to fit the curved upper contour of the windings 8. The inner stop and wire terminal [3 consists of a clip which 2 extends over the width of the body 1 and is bolted to this body by means of the bolt [4 and the nut I5 threaded on this bolt. This acts as a stop for the arm l0 and also serves to act as a terminal binding post for the windings 8.

A similar terminal clip 16 is mounted at the outer end of the spiral body 1 and this clip is attached to the body by means of the bolt I1 and the nut l8 threaded thereon. The arm H! is slidably mounted on the shaft II by means of the slot l9 formed in the arm, the shaft having a groove therein to enter the slot [9. Thus, the arm I 0 can slide laterally with relation to the shaft II as the arm is rotated and as it follows the helical path of the body I.

The terminal mounts l3 and I6 also act as binding posts for the wire windings 8. The terminal connected to the arm It consists of a metal strip 6, which is positioned under the arm [0 and is thus in contact with said arm, the other end of said strip extending downwardly and being bent over the face of the body 1 adjacent the panel 4. A lead to this strip is thus separated from the arm [0 and does not interfere therewith.

Having described our invention, we claim:

1. A helical resistor comprising a helical body, wire windings wound on the body and over the width of said body, mounting means on said body whereby the body may be attached to a panel, a shaft journalled in the body, an arm mounted for lateral movement on said shaft, the outer end of said arm being curved to fit the windings and a knob attached to one end of said shaft, a terminal clip, one end of which is positioned under said arm and surroundin said shaft, the other end of said clip projecting from said body on the side opposite said arm.

2. A helical resistor comprising a helical body, wire windings Wound 0n the body and over the width of said body, mounting means on said body whereby the body may be attached to a panel, a shaft journalled in the body, an arm mounted for lateral movement on said shaft, the outer end of said arm being curved to fit the windings, and a knob attached to oneend of said shaft, a terminal clip, one end of which is positioned under said arm and surrounding said shaft, the other end of said clip projecting from said body on the side opposite said arm, an inner and an outer clip mounted on said body, said winding being attached to each of said clips, said clips acting as inner and outer terminal stops.

HARLAN BOWITZ. STANLEY S. FISHFADER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,450,919 Harris Apr. 10, 1923 2,429,592 Beagles Oct. 28, 1947