US2032187A - Circuit breaker - Google Patents

Description

Feb. 25, 19360 R, g; so s 2,032,187

C IRCUIT BREAKER Filed Sept. 21, 1934 INVENTOR Pas/nus CARL Para? fiomz/vselv,

BY WRNEY Patented Feb. 25, 1936 UNITED STATES PATENT OFFICE CIRCUIT BREAKER Rasmus Carl Peter Sorensen, Brooklyn, N. Y.

Application September 21,1934, Serial No. 744,871

14 Claims.

Fig. 3 is a bottom plan view of the device of Fig. 2.

Fig. 4 shows the stamped out blank from which the lever of Figs. 2 and 3 is formed.

Fig. 5 shows the rubbing contact or block be- 3 fore being attached to the lever.

the spring is formed and before it is bent to shape.

Fig. 7 shows the step of slitting or grooving the I portion I! of the lever.

Fig. 7a shows the final position of the split parts.

Fig. 8 shows a modified means of attaching the spring to the lever arm.

Figs. 9, 10 and 11 each show other and modifled means of attaching the lever arm and spring. In Fig. 1 the timer comprises a usual housing III in which is mounted the rotatable cam which moves the timing lever I2 about its pivot I3 to make and break the circuit through the current contacting disc I4 engaging the stationary cooperative contact. A rubbing contact or block I5 secured to the lever arm I2 engages the cam II for moving the lever arm I2 outward about its pivot against the action of the leaf spring I6. This spring is secured to the housing wearing properties due to the circuit being rapidly made and broken through this contact.

To provide a support or seat for the disc I4, the end portion I! of the lever (see Fig. 4) is longitudinally split by a tool I8 as illustrated in Fig. 7, so that the half portions I9 and 20 may then be bent into substantial alinement with one another and at substantial right angles to the main body portion of the lever I2 (as shown in Fig. 7a).

Such a support provides a good foundation to which the contact disc I4 may be secured in the usual manner. From Figs. 3 and 6 it will be seen 5 the spring I6 is longitudinally slotted at 2| in an intermediate portion of the spring where it passes adjacent the lever pivot. The end portion of the spring for attachment to the lever is bent into the form of a saddle adapted to fit around one 10 edge portion of the lever and provided with the side faces 22 and 23 which are adapted to lie contiguous to the side faces of the lever.

In forming this saddle the spring is given a twist 24 (as shown in Figs. 2 and 3) and a rivet 25 passes through the two sides of the saddle clamping the lever arm I2 between them. This rivet passes through the perforation 21 in the lever arm I2 and in order to better secure and Fig. 6 is a plan view of the material of which interlock the saddle portion with the lever arm a notch 28 is cut in the edge of the lever arm about which the saddle passes so that the ends of the saddle may fit in the sides of this notch.

Another notch 29 on the opposite edge of the lever is shaped to receive the rubbing contact or block I5, such contact being of wear resisting insulating material having the perforations 30 drilled therein to receive the rivets 3| securing the rubbing contact or block to laterally extending lugs or flanges 33 and 34 on the saddle. These 0 flanges are perforated at 32 to receive the rivets 3I and in this manner the rubbing contact or block is tightly held to the lever I2.

Any thrusts on the rubbing contact or block I5 which are normal to the longitudinal axis of the 35 lever are transmitted through the rivets 3| and 25 whereas any thrusts lengthwise of the lever are transmitted not only through the side flanges 33 and '34 but also through the rivet 25 and through the sides of the notch 28. Within the 40 pivotal endportion of the lever is mounted the usual bushing 35 of insulating material to which are secured eye portions 36 adapted to clamp the lever between them after the outer ends of these eyes have been contracted or squeezed into the insulating bushing 35 to hold them in place. Other well known means of mounting the insulat ing bushing in the end portion of the lever I2 may also be used.

In Fig. 8 it will be seen that the saddle 31 is not integral with the spring I60, but is secured thereto by having lateral flange portions on the saddle bent to the shape illustrated at 38 for engagement with a bent end of the spring Ilia.

In Fig. 9 the saddle 310 has a shorter lateral flange 42 over which'a bent end 4| of the spring I60 is secured by rivet or in other ways.

In Fig. 10 the saddle 311) has laterally extending flanges 39 to each of which the spring 16b is clamped by the rivet 40.

The saddle 31b in Fig. 11 has its laterally extending flange 43 below the lever where the spring IE1) is secured by the rivet 43. 7

Among the advantages of this invention may be mentioned the better attachment of the rubbing contact or block to the lever and the simplicity of the construction inasmuch as it is not necessary to have the rubbing contact bent or molded in place. The opposite laterally extending half portions or lugs I9 and 20 are more securely attached to the lever when formed from a solid lever by the cleaving operation, instead of when the lever is formed in two thicknesses of thin metal. Where the lever is solid there is less danger to separate vibrations or chatter being set up in one part of the lever from the other under the very high speed operation necessary today in these lever arms for combustion engines.

It is also believed that the base of the half portions or lugs l9 and 20 is stronger when it is constituted by thefull thickness of the lever arm !2, than is the case when these lateral lugs are each bent from portions of a lever that is not integral and solid.

The spring l6 being integral with the saddle provides a stronger construction in Fig. 2 than is shown in Figs. 8 to 11 inclusive, although these Figs. 8 to 11 provide a substantial and fairly rigid attachment between the spring and lever through the saddle extending over an edge of the lever.

The support for the rubbing contact or block [5 may also be formed in substantially the same way as is the support 20 for the electrical contact M, that is by splitting or cleaving a portion of the lever arm and spreading the laterally extending split portions to form a support extending at right angles to the main body portion of the lever, and to which the rubbing contact or block I5 may be secured by rivets or otherwise. 7

In this latter event the support formed would be substantially horizontal and therefore the rubbing contact or block I5 should preferably be formed of 7 an L-shaped piece of molded or other insulating material. The formation of a support for the rubbing contact or block by a similar process to that used in the formation of the electrical contact support is satisfactory either alone or in combination with some additional type of support for the rubbing contact or block, such as the use of the saddleillustrated herein to strengthen and reinforce the rubbing cont-act or block support.

I claim: 7 1. A circuit breaker lever of the type adapted for timers for ignition apparatus and having a holding the sides of the saddle substantially contiguous the side faces of the lever, and a rubbing block securedto said saddle.

3. A timing lever carrying a bent metal saddle over an edge portion of the lever, securing means holding the sides of the saddle substantially contiguous the side faces of the lever, and a rubbing block secured to said saddle by laterally bent flanges on said saddle.

4. A timing lever carrying a bent metal saddle over an edge portion of the lever, securing means holding the sides of the saddle substantially contiguous the side faces of the lever,.and a rubbing block secured to said saddle, a pivot for said lever,

a leaf spring secured to said saddle, and passing around the pivot for cooperation with a housing in which the lever is located.

5. A timing lever carrying a bent metal saddle over an edge portion of the lever, securing means holding the sides of the saddle substantially contiguous the side faces of the lever, and a rubbing block secured to said saddle, a pivot for said lever, a leaf spring secured to said saddle, and passing around the-pivot for cooperationlwith a housing in which the lever is located, said spring being integrally secured to said saddle by slitting an intermediate portion of the springto said saddle and twisting sides of the spring adjacent the end:-

of said slitan amount suificient to have the plane of the saddle side faces substantially normal to the plane of the major portion of said spring.

6. A timing lever carrying a bent metal saddle over an edge portion of the lever, securingmeans holding the sides of the saddle substantially con tiguous the side faces of the lever, and a rubbing block secured to said saddle, a pivot for said lever, a leaf spring secured to said saddleyand passing around the pivot for cooperation with a;

housing in which the lever is located-said spring being secured to said saddle adjacent the endof the saddle toward said pivot and away from said rubbing block. p

'7. A timing lever having laterally extending pairs of lugs, one pair for attachment to a circuit make and break contact and another pair for attachment to a rubbing-block, one of said pairs of lugs being fastened to the lever bodyand another pair being integral and-of abouthalf the thickness of the lever body portion.

.8. The combination with a spring'for a timing lever having an' intermediate longitudinalslot, an end portionof the spring sides being twisted to form a saddleextendingaround an edge por-'; tion of the lever, securing means passing through the lever and through opposite side. portions of. the saddle, laterally extending lugs on the saddle and a rubbing block secured to said lugs.

9. A timing lever having a support for a con-: tact, said support comprising. laterally extending lugs formed by cleaving an end portion of the lever body in the plane thereof and oppositely spreading the similarly shaped lugs.

10. A timing lever comprising a, rubbing block and securing means therefor, thefopposite edges of the lever being notched to assist in positioning said rubbing block and its securing means.

11. A timing lever comprising an. electrical contact portion adjacent one end of the lever, means for pivotally mounting the lever adjacent its other end, a rubbingblock carried by an intermediate portion ofthelever, a saddle extending around an edgeof the, lever to which said rubbing block is secured, and a leaf spring for moving the lever in one direction, said spring being integrally connected to said saddle.

12. A timing lever having a rubbing contact and an electrical contact, a support for each contact, each of said supportscornprisinglaterally extending portions integral with the body portion of the lever, the body portion of, the lever being solid and of substantially double the thickness of the laterally extending contact supporting portions whereby each of said supporting portions constitutes a substantially fiat continuous plate extending across an edge of the lever.

13. A timing lever having a contact adjacent one end portion and a rubbing block carried by an intermediate portion of the lever, lugs to which said block is secured, said lugs being fastened to the lever, a spring for moving said lever in one direction, said spring having its end portion contiguous the lever bent and secured against the side face of the lever.

14. A timing lever provided with a bushing of insulating material for pivotally mounting the lever adjacent an end portion, an electric contact plug secured adjacent the opposite end portion of said lever, a rubbing block located intermediate said electric contact and said bushing for cooperation with a mechanism for actuating said lever, a saddle secured over a longitudinal edge of. said lever and provided with flanges projecting outwardly from the lever and saddle, said rubbing block being secured to said flanges and extending across the longitudinal edge of the lever which is opposite that around which the saddle extends, and a leaf spring secured to said saddle on opposite sides of said lever intermediate the bushing and electric contact for actuating the lever in one direction.

RASMUS CARL PETER SORENSEN.

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