US2019177A - Electric switch - Google Patents

Description

Oct. 29, 1935. H. M. DRESSEL ET AL ELECTRIC swmcn Filed A rii 12, 1935 112' yen/0A5 Henry DreJJ'el Ken/262W (3 4/030!) p v1 0 Lr M JP? WAN w w d b E. a J 4 r WW g 2.01am 11 i.

Henry M.

Drem'el, cum, KM om...

Arlington Heights, and Edward J. Mastney, Berwyn, 111., asaignors to Oak Manufacturing Company, Chicago, 111., a corporation of lllinok Application April 12, 1935, Serial No.--15.950 3 Claims. (01. 200-11 This invention relates to electric switches and particularly to switches for use in radio receivers,

. and other apparatus where minute currents and potentials are encountered.

Referring to the drawing:

Figure 1 is a sectional elevation of one form of switch along line l- -l of Figure 3. I Figure 2 is a sectional elevation of a modified form of switch, along line 2-2 of Figure 4.

Figure 3 is a top view of the switch of Figure 1. Figure 4 is a top view of the switch of Figure 2. Figure 5 is a detail. Referring to Figure 1, a shaft I passes through a metallic bushing 2, having a threaded portion I and a collar portion 4. Beyond collar portion v4 is a reduced mounting portion 5, on which is disposed a strip of-insulating material 6 of some phenol condensate. This material may be of any shape and is here shown as generally rectangular with the short sides curvilinear at I and 8. It will be noted that shaft I passes through the center portion of strip 5 and this strip bears against collar portion 4 of bushing 2. Abutting against the other side of strip 6 and disposed around collar portion 5, is a metal washer ill. The bushing 2, strip 6 and washer l are maintained together, by spreading the edge ll of collar portion so that it overlies washer l0 and locks the same in place.

One end of shaft I is cut down to provide a substantially rectangular rotor locking section l5, as shown in Figure 3. In this instance the length of section I5 is sufficient to accommodate a metal washer l8 and a rotor l9. These two have suitable apertures punched through so that they may be locked against rotation. The free end of section I5 is then spread over at to prevent the washer and rotor from slipping off the shaft.

The rotor assembly is positioned by threading shaft I through bushing 2. To maintain the shaft in the bushing, a circular slot 2| is provided around shaft 1 at the edge of threaded portion 3 of bushing 2. A spring ring 22 is disposed in this slot, and forms an abutment against bushing 2 to maintain the structure intact.

Rotor I9 is an elongated metal member having depending tips bent down toward strip 6. Each tip 25 preferably has the two edges Qrved at 25 and a wide slot 21 cut in the connec edge. Cooperating with rotor I! are a plurality of stator contacts 29-32 inclusive. As is indicated in Figure 3) two contacts are disposed at each end of strip 6 on the arc of a circle concentric with rotor ll. Since the contacts are all the same, a detailed description of one will suffice. Contact 28 comprises a body portion 25 rigidly maintained on strip 6 by means of an eyelet 36. On one side of body portion is a connecting portion 31 suitably apertured at 38 I to which wires may be soldered. Preferably portion 37 is bent up at an angle to body portion 35. The other side of body portion 35 terminates in a bent over spring contact portion 40. The extreme tip of is preferably provided at u the sides thereof with ears 4| bent down toward strip 6. The width of portion 40 is somewhat 'less than the length of slot 21 in rotor contact l9 whereby a locking or indexing action is obtained. Spring portion 40 is normally biased I so that it firmly presses against rotor 19.

In order to limit the rotation of member I8, washer I8 is provided with a circumferential slot M of predetermined angular extent. For convenience in assembly, washer I8 is shown with two such slots diametrically opposite to each other so that no particular care need be exercised with washer l8. Washer it has projecting therefrom at opposite points fingers 42 and 43. Finger 42 is bent upwardly and extends into slot 4|. 1| Finger 43 is bent downwardly and extends through a slot 44 in strip 6 and a slot 45 in bushing 2. This last finger 43 locks strip 6 and bushing 2 together. These two fingers may be equal so that no special disposition of washer III is 80 necessary.

In Figures 2 and 4 a modified form of switch is shown where rotor I9 is insulated from shaft l. The rotor locking portion l5 of the shaft is longer and accommodates washer l8, insulating washas er 50, rotor l9, insulating washer 5| and metal washer 52. Rotor I!) has a large central aperture 53 stamped out to clear shaft I. Beyond this aperture, ears 54 are stamped out and bent down. These ears 54 are adapted to engage slots "0 55 in insulating washer 50. Washer is preferably cut away so that as shown in Figure 4 it lies within the boundaries of rotor I9 although of course this is not important. Rotor I! has an 'apertureri ear 56 connecting a wire thereto. a

What is claimed is:

1. An electric switch comprising an insulating base having an aperture .therethrough, a bushing disposed in said aperture, a shaft rotatably mounted in said bushing and having an end por- 50 tion projecting beyond said base, a metallic rotor rotatively locked to said shaft at the projecting' portion, said rotor consisting of a rigid elongated member having at least one downturned end with the corners rounded, and a plurality of stau shaped contacting portion on the inner end of said body portion, said contacting portion having its free end substantially flat with side ears bent away from said rotor and adapted to make contact between said flat portion and said bent end of the rotor.

2. The switch of claim 1 wherein said rotor has a slot between the rounded corners of the bent ends, said .slot being somewhat wider than the flat portion of the stationary contact whereby an indexing action is obtained.

3. The structure of claim 1 wherein said bushing projects beyond said base toward the rotoi side of said base, a metal washer disposed arounc said bushing and abutting said base, said waahel being provided with a finger extending towarr said rotor, a washer rotatively locked to ask shaft disposed between said rotor and first washer, said second washer having a slot into whlcl the finger of said first washer projects and beim large enough so that a predetermined anguia1 rotation of the rotor is permitted.

HENRY M. DRESSEL. KENNETH C. ALLISON. EDWARD J. MASTNEY.

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