US1673385A

US1673385A - Electric switch

Info

Publication number: US1673385A
Application number: US66203A
Authority: US
Inventors: Wurdack William
Original assignee: WM WURDACK ELECTRIC Manufacturing CO
Current assignee: WM WURDACK ELECTRIC Manufacturing Co
Priority date: 1925-11-02
Filing date: 1925-11-02
Publication date: 1928-06-12
Anticipated expiration: 1945-06-12

Description

Junelz, 1928. y 1,673,385 W. WURDACK' ELECTRIC SWITCH Filed Nov. 2, 1925 li'atentetll June 12, A1928. p.

UNITED STATES v1,673,385 'PA'rsN'rl OFFICE.

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application med mnmbr This invention relates generally to electric switches. More particularly, my lnyentlon relates to a certain new and useful improvement in electric switches ofthe so-called knife type and-has for its chief object the provision ofl a switch of the type stated which is of inexpensive, compact, and durable form and' structure, and which 1s sov .constructed to effect in an eiiicient manner lo ielding retention of the blade or blades 1n both neutral and swung or circuit-closing positions.

- And with the above and other ob]ects 1n view, my invention resides in the novel features of form, construction, arrangement,

and combination of parts hereinafter described and pointed out in the claims.

In the accompanying drawing,

Figure 1 is a side elevational view of an 2o electric knife-switch embodying my invention, the blades of the switch eing shown in full lines in neutral position and in dotv and-dash lines in swung or thrown, circuit-u closing position; l

Figure 2 is an end view of the sw1tch; and

Figure 3 is an enlarged vertical or longitudinal sectional view of the switch, showing the contact-engaging blades in thrown circuit-closing position opposite to that of Figure 1.

Referring now more in detail and' by reference characters to the drawing, which illustrates a practical embodiment of my invention, A indicates a suitable preferably insulation base, rigidly fixedy to which is a standard or supportpreferably, as shown, in the form of a U-shaped .member B, whose legs 1-1 are presented upwardly and suitabl spaced.

ormed in the upper ends of theY standard-legs 1, are arcuate bearing-recesses. as at 2, for a shaft 3. Fixed upon shaft 3 intermediate the standard-legs 1, is a member or block 4 of hexagonal or other suitable polygonal formation; and disposed on shaft 3 outwardly of the standard-legs 1, are retaining-nuts 5-5. f

C designates a U-shaped member or yoke which depends from the shaft 3 for shiftable movement bodily intermediate the standard-legs 1, the yoke C adjacent the upper ends of its legs 6, 6, being formed with shaft-accommodating apertures 7, whose upper wall is correspondlngly polygonl' in formatwn, as shown, for inters, im.' semi no. casos.

engaging cooperation with the polygonal block 4, for urposes shortly appearing. Suitably vrigid attached, as at 8, to the base or bight of, standard B, is a screw-bolt or the like 9, which projects upwardly through the bight 10 ofV yoke C, as shown, and dlsposed on bolt 9 intermediate its head and the yoke-bight 10, is a coiled spring Fixedy on shaft 3, is a small plate 13 pro-v vided with a laterally presented finger 13' working in and adapted for engagement with the end-walls of an arcuate slot 14 formed in the adjacent wall or leg 1 of standard B, also for purposes shortly appearmg.

Also suitably fixed on the opposite ends of shaft 3, are insulation-

blocks

15, 15, carrying downwardly presented substantially yoke-shaped .blade-providing members 16, whose

blades

17, 17, are preferably of the spring-jaw type for electrical engagement with circuit-contacts or terminals of the knife-type suitably fixed to and upstanding from base A. The switch here specifically illustrated is of the so-called double-pole, double throw type, and there are consequently three sets of the circuit terminals,

Jas at 18, 19, and 20, suitably located upon the -base A for engagement by the blades 17 as thew shaft 3 is rotarily actuated in one or .the other direction by means of a suitable handle 21 iiXed thereto.

Now, in use and operation, the switchhandle 21 and blades 17 are, I might say, normally in neutral position or in the osition thereof illustrated in full lines in igure 1, the yoke C being in fulldownwardly pulled position under the tension of spring 12 and the polygonal block 4 being in full matching registration or engagement with the polygonally shaped walls of the yoke apertures 7. It being understood that the spring or other resilient member 12 is constantly resiliently pulling downwardly upon the yoke C, it will be seen that the engagement between the block 4 and yoke C will retard axial or rotar actuation or movement of the shaft 3 an that the blades 17 will hence be yieldingly retained in such neutral position. Yet, as the handle 21 is positively swung to the left, reference being had to Figure 3, to enga e the blades 17 with, and close the circult etween, the

terminals

18 and 20, the block 4 camwise engages at lll .of slot '14', limiting the swun its corner 22 with the ad'acent oblique faces v movement of the switch-bla es 17. The

A spring-pulled yokeC then functions in like manner to retard returning axial or rotary movement of the shaft y3, the blades 17 being thereby yieldingly retained in such circuitclosing or electrical engagement with said terminals. To break the circuit and return the blades 17 to neutral position, the handle 21 is reversely manually or otherwise forcibly moved to the right, whereupon the block surface or corner 22 rides down the oblique faces 23 of the yoke apertures 7 and the block 4 and yoke C assume in due course their full matching registration, the springpulled yoke C functioning then, as described, toTetain the parts in normal position. Or, should it be desired to engage the blades 17 with, and close the circuit between, the

terminals

18 and 19, the handle 21 is further moved to the right, when in a similar manner, the block 4' at its corner 24 rides up, so to speak, the adjacent oblique faces 25 of the yoke-apertures 7 and thereby shifts the yoke C upwardly against the pull of its spring 12, the yoke C, following electrical engagement between the blades 17 and said

terminals

18, 19, functioning to similarly retain the blades 17 in electrical engagement therewith, the linger 13', also in a similar manner, engaging the opposite end wall of the slot 14 and limiting the swung movement of the handle 21 and blades 17 in such direction.

My new switch comprises few, readily assembled parts, and by its construction the blades are in a simple, but most eiiicient manner, yieldingly retained either in neutral position or in either of their swung circuit-` closing positions.-

Although not here specifically shown, it will be evident that, by suitably reducing the length of the slot 14, the switch here illustrated may be readily converted into one of double-pole, single throw type, that by omitting upon one side of the shaft 3 one of the knife-blade providing members 16, the switch here illustrated may be likewise easily converted into one of the single pole, double throw type, and that other changes in the form, construction, arrangement, and combination of the several parts ofthe switchmay be made and substituted for those herein 4shown and described without departing from the nature and principle of my invention.

Having thus described my invention, what I claim ent is:

1. In an electric switch, an axially movable shaft, a block cam fixed on the shaftz a shiftable cam member adapted for camwise mterengaging co-operation with said block, and means resiliently pulling upon said member for yieldingly retarding through the engagement between said member and said block axial movement of the shaft. l

2. In an electric switch, an axially movable shaft, a polygonally-shaped block lixed on the shaft, a member depending from the shaft and having polygonally shaped apertures for camwise -interengaging shiftable co-operation with said block, yand means resiliently pulling upon said member for yieldingly retarding through the camwise engagement between said member and said block axial movement of the shaft. l

3. In an electric switch, an axially. movable shaft, a polygonally-shaped block fixed on the shaft, a member depending from the and desire to secure by Letters Patshaft and having polygonally shaped apers ently pulling Aupon said member for yieldingly retarding through the Vcamwise engagement between said member and said block axial movement of the shaft, and means for limiting the axial movement of the shaft. y

4. In an electric switch, a standard having an arcuate slot, a shaft mounted for axial movement on the standard, a contact-engagin blade carried by the shaft, a polygona ly-shaped block fixed on the shaft, a yokeshaped member depending from the shaft and having polygonally-shaped apertures for camwise interengaging shifting co-operation with said block, a member carried by the shaft and working in said slot for limiting the axial movement of the shaft, and means `resiliently pulling upon the yokeshaped member for retarding through the camwise engagement between said member and said block axial movement of the shaft for yieldingly retaining the blade in neutral and swung positions.

In testimony whereof, I have signed my