US390481A

US390481A - William a

Info

Publication number: US390481A
Authority: US
Publication date: 1888-10-02
Anticipated expiration: 1905-10-02

Description

(No Model.) 8 W. A. JOHNSON.

ELECTRIC LIGHT CIRCUIT GUT-OFF SWITCH. No. 390,481. Patented Oct. 2, 1888.

PATENT OFFIQEQ "WILLIAM A. JOHNSON, OF TORONTO, ONTARIO, CANADA.

ELECTRlC-LlGHT-CIRCUIT CUT-OFF SWITCH.

SPECIFICATION forming part of Letters Patent No. 390,:81, dated October Application filed November 23, 1887. Serial No. 256,090. (Xo model.)

To aZZ 1117mm it may concern.-

Be it known that 1, WILLIAM ASAIIEL JOHNSON, of the city of Toronto, in the county of York, in the Province of Ontario, Canada, manufacturer, have invented a certain new and useful Improvement in EIectricLight-Oircuit Out-Off Switches, of which the following is a specification.

The object of the invention is to design a si mply-constructed electric-light-circuit cut-' off switch by which the current may be completely cut off from the loopcircuit; and it con sists, essentially, of two metal levers coupled together by an insulated connection and pivoted upon the binding-posts of the dynamocircuit, the said levers being arranged in connection with the contact-plates connected, respectively, with the binding-p0sts in the loop circuit and with one of the binding-posts in the dynamo circuit in such a manner that the current may be thrown on and off the loop circuit by the simple adjustment of the levers in such a manner that the levers will make contact with the binding-posts of one circuit before breaking contact with the others, all as more fully hereinafter described and claimed.

Figure 1 represents a view of my improved switch set so that the loop circuit is completely cut o'tl'. Fig. 2 shows the switch set so that the current shall pass through theloopcircuit.

A and B represent the binding'posts ol' the dynamocircuit, and O D the bindiugposts of the loop circuit. The lever-E is pivoted upon and is in contact with the binding-post A, and the lever F is pivoted upon and in contactwith the binding post B. These two levers E and F are coupled together by the insulated link G, so'that themovement of one lever shall be communicated to the other.

H is a contact-plate connected to the hindlug-post C, and extending toward the leverE, as shown. I is a similar cont-actplate connected to the bindingpost D and extending toward the lever F. J is also a contact-plate connected to the post A and extending past the post 0 toward the lever F, as indicated.

\Vhen my switch is set as shown in Fig. 1, the current will pass from the binding-post B along the lever F, and then through the contactplate J, through the binding-post A, and back to the dynamo, and as both binding-posts O and D are completely isolated no current can possibly reach the loopcircuit. "When the switch is set as shown in Fig. 2, the current from the dynamo enters the binding-post I3, along the contact-plates F and I, and thence into the loop'circuit through the binding-post D, and back again to the dynamo, through the binding-post O, contactplate H, lever E, and binding-post A.

It will be noticed that the distance between the contact-plates I and J is less than the width of the lever F. Consequently the said lever F comes in contact with one of the said plates before it loses contact with the other.

It will be seen that by employing a cut-off switch such as the one described a loop-circuit running into a building may be completely cut oli' from the main circuit, leaving the wires and lamps within the building pcr fectly safe to handle, and that the switch makes contact with the plates H and I before breaking contact with the plate J, and vice versa, so that there will be no spark and no danger from fire. This is important.

IVhat I claim as my invention is- 1. The combination,with the binding-posts A B CD, of two levers pivoted upon the binding-posts A B, and connected to move to gether, the contactplates II I, connected to the binding-posts O D, respectively, and the inclined contact-plate J, connected with the binding-post A and extended between the plates H I, substantially as and for the purposespecified.

2. The combination, with the binding-posts A B O D, oftwo levers pivoted upon the binding-posts A 1-3 and connected to move together, the contact-plates II I, connected to the binding-posts C D, respectively, and the inclined contact-plate J, connected with the binding-post A and extended between the plates H I, the space between the plates I J being less than the width of the lever F, substantially as and for the purpose specified.

Toronto, October 28, 1887.

IVIIJIJIARI A.

JO HNSON.