US1291651A - Electric switch. - Google Patents

Description

R. 0. W. LUNDIN.

AELECTRIC SWITCH.

APPLICATION' FILED ocT. 15. 1911.

Patented J an. 14, 1919,

immmmm UNITED STATES PATENT oEEioE.

BAHN-AR O. W. LUNDIN, 0F NEW' BRITAIN, CONNECTICUT, ASSIGNOR T0 THE TRUMBULL ELECTRIC MANUFACTURING COMPANY, OF PLAINVILLE, CONNECTICUT, A CORPO- RATION OF CONNECTICUT.

ELECTRIC SWITCH.

Specification of Letters Patent.

Patented J an. 14.-, 1919.

To all whom it may concern:

Be it known that I, RAGNAR AO. W. LUN- DIN, a citizen of the United States of America, residing at New Britain, Connecticut, have invented a new and useful Electric Switch, of which the following is a specification.

My invention relates particularly to switches of the push button type and aims primarily to provide a switch of this character which will be simple, small and coml pact in construction, which will be quick in its action, which'will require a relatively short movement to effect its operation, and which will have a high current-carrying capacity. A special feature of the invention is the construction of the snap switch mech` amsm in such form that it may be disposed wholly at one end of the switch base to enable the mounting of a supplementary or auxiliary switch, such asV a rotary snap switch on the other end of the insulating Briefly, the invention comprises in combination with a supporting frame mounted on the base, a push button slidingly mounted lin said frame and connected by means of a switchthrowing spring with a swinging contact making lever vpivoted on the frame at one side of said push button. This sliding push button isconnected at its upper end with a rocker, which may have a second push button engaged with .its opposite end, and this rocker is preferably pivoted on apost provided by an upstanding part on the supporting frame.

In the accompanying drawings, I have illustrated the invention embodied in the preferred form, but I would have it understood that changes and modifications may bel made without departing from the true spirit and scope of the invention.

In said drawing:

Figure 1 is a side view of the switch with the insulating base portion broken away and shown in section to disclose the snap switch mechanism therein.

Fig. 2 isa top plan view of the lower half or main part of the switch base and parts carried thereby.

Fig. 3 is a bottom view of the same to illustrate the several cross connections.

Fig. 4 is a cross sectional view taken sub- :sBtantially on the plane of the line 4 4 of ig. 2. v

Fig. 5 is a similar viewwith the switch parts in a diierent position.

Fig. 6 is an enlarged detail view of the snap switch mechanism removed from the base, the push button being broken away for ack of space.

Considering the drawing now more in detail, 7 designates the supporting frame set down in a recess 8 in the switch base 9 and made up of base portion 10 with upstanding side parts 11 bent toward each other at -their upper ends to form a top portion 12.

This frame 1s shown secured in place by means of screws 13 passed up through the bottom of thel insulating base into engagement with the base portion of the frame. Formed in the top and bottom portions of this frame are guide slots 14" and 15 for the sliding stem or shank 16 of the push button 17, the upper guide slot 14 being open at the side of the frame as clearly shown in Fig. 6 and the lower guide slot 15 ex' tending entirely through the base portion of the frame as is also shown in this View.

The stem of the push button has a rearwardly bent angled anchorage for one end of the switch throwing spring 19, the opposite end of this spring being connected at 20 to the free end of a contact making lever 21 which is pivoted in the frame at 22. The pivot guides for this lever may be formed as open slots' in the side arms 11 of the frame and disposed in the edge ofthe frame opposite that edge in which the lopen guide slot 14 is provided. This enables an assemblage of these parts yby simply engaging the pivots 22 of the lever sidewisein the pivot slots in one edge of the frame and the dropping of the push button shank inthe lower guide opening 15 therefor, the spring 19 serving when connected with these parts to hold them in their open bearings.

The throwing springis connected with the push button slide at a point 23 which lug 18 which forms an' the contact making lever in the case illuse trated by providing it with a contact arm 24 secured to the swinging lever 21 by an insulated joint at 25 and projecting past the pivotal point of the lever and beyond the opposite side of the frame, where it is adapted to form a bridge between a pair of relatively stationary contacts 26-27. The oscillating movement of the contact making lever is limited by stop portions 28 on the opposite edges of the lever, adapted to en gage with the top and bottom edge portions of the frame, as clearly shown in Fig. 4, and the reciprocatory movements of the push button may be limited by the upper and lower Vedge portions of the anchorage lug, engaging the top and bottom of the frame as indicated by Figs. 4, 5 and 6. The push' button stem may further be notched as indicated at 29 in Fig. 6 where it engages in the upper vopen guide slot 14, the ends of such notch also being utilized as stops when so desired.

Another feature of the supporting frame is the provision of it 'with a laterally offset Aextended upstanding post 30 for the switch operating rocker 31 which is shown pivoted thereto at a point intermediate its ends at 32. This rocker is shown engaged with the upper portion of the push button shank 16 by means of a lug 33 which is hooked into an opening34 provided for it in the push button shank.

The opposite end of the switch operating rocker is shown engaged with the second push button 35 by means of a fork 36 em-' bracing a fia-nge 37 on the lower end of the push button.I This second push button is also indicated as slidably engaged on a spindle 38 which may be the spindlev of a rotary snap switch mechanism such as that lindicated generally at 39 in Fig. 2.

From this description it will be apparent that as the push buttons are operated the inovably supported end of the switch throwing spring is carried past the center of support of the contact making lever which will cause said lever to be alternately snapped in opposite directions, thus quickly making anol breaking contact. The shiftable end of the spring need be carried but a slight distance to each side of the pivotal center of the lever, and hence the push button movement necessary for4 effecting snapping of the switch need only be relatively slight. This push button movement is an advantage in that the buttons need not project so far,

' pivoted on the supporting of the sliding stem of said push button and 'a switch throwing spring connected at one they are easier to operate .and the parts can be made smaller and disposed more compactly.

The connection between the two switches are illustrated in a general way in Figs. 2 and 3 wherein 40, 41, 42 and 43 designate the four switch terminals, terminal 40 bein connected by the back strap 44 with one o the rotary switch contacts 45, terminal 41 being connected directly with the stationary snap switch contact 26, terminal 42 being connected by a back strap 46 with the rotary snap switch contact 47 and `terminal 43 be-I ing connected with the rotary switch contact 48.

I claim- 1. In a switch ofthe character set forth, a switch base, a Supporting frame mounted on the base at one end thereof and having an upstanding post disposed substantially centrally of the base, a rocker pivoted on said upstanding post, push buttons connect- I ed with the opposite ends of said rocker, one of said push buttons havin a dependent stem slidably engaged in le supporting frame, a swinging contact making lever frame at one side end to the free end of the swinging contact making lever and connected at its opposite end to the sliding push button stem at a point which in the reciprocation of such stem travels past the center ofV pivotal support of the contact making lever.

2. In a switch of the character described,

'.a switch base, a supporting frame mounted on the switch base and comprising a supporting base and upstanding arms rising therefrom, one of said arms having a laterally directedupstanding ypost and said base portion and arms having guiding slots for a reciprocating slide, a rocker pivoted on the upstanding post, a push button connected with one end of the rocker and having a shank portion slidably guided in the slots in the supportingframe, a contact making lever pivoted in the supporting frame at one side of said stem, a switch throwing spring connected between said 4stem and the free endl of the contact making lever and a push button connected with the opposite end of the rocker.

3. Tn a switch of the character set forth, a switch base, an open supporting frame mounted in an upright position on said base having a guiding slot extending through thebase portion thereof and a guiding slot izo end of the said Contact making lever, said tension spring holding the operating slide engaged in the open guiding slot.

Ll. In a switch of the character set forth, a switch base, a switch frame mounted thereon and provided With spaced guide slots, an operating slide Working in said guide slots and having an angularly turned anchorage lug, a Contact making lever piv- Copiel of this patent may be obtained for five cents enh, by addressing the oted on the frame, a switch tension spring connected with the free end of said pivoted lever and with the anchorage lug of the slide, cooperating stopvshoulders on the slide and frame limiting the recprocatory movements of the slide and coperating stops on the Contact making lever and frame limiting the oscillatory movements of said lever.

RAGNAR O. W. LUNDIN.

Comminioner of latenti,

Wallington, D. 0."

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