US951851A - Electric switch. - Google Patents

Description

F. W. SMITH.

ELEUTEIU SWITCH.

APPLICATION FILED PBBJ25, 1909.

Pat ented Mar. 15, 1910.

2 SHEETS-SHEET 1.

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7 l/WENTOR M/IC. @Arrmqu WITNESSES.

UNITED STATES PATENT orrion.

FRANK W. SMITH, OF NEW YORK, N. Y.-

ELECTRIC SWITCH.

To all 'wham'it may concem:

Beit known that I, FRA K W. SMITH, a' citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Electric Switches, of which the followin is a specification.

The invention relates to electric switches and consists in the improved construction hereinafter set forth, wherein a switch arm normally breaking circuitby gravity is moved into circuit closingposition by a solenoid and mechanically there retained by a link mechanism, which may be released by other electromagnetically controlled mechanism to permit the switch arm to return to normal position and so break circuit.

The invention more particularly consists in the various combinations recited in the claims.

In the accompanying drawings.Figure 1 is a front elevation of my improved electric switch. F ig. 2 is an electrical diagram showing the circuit connections. Fig. 3 is a section on the line 92, :11. of Fig. 1, showing-the switch arms in circuit closing position. Fig. 4 is a similar section showing the switch arms in position to open circuit. Fig. :i is a side elevation, and Fig. 6 is a detailed view of the roller carrying" end of the core of the main solenoid.

Similar chara -ters of reference indicate like parts.

1 is the base or back plate. 2 magnetic material secured-on said base. The frame is divided into two sections by the partition 3. In the outer section is disposed the main solenoid 4. through which and through an opening: in the lower horizontal member 5 of the frame passes the core- 6. The lower end of the'core 6 is bifurcated-to receive a roller 7, the pin of which passes through said bifurcations and also through bifurcated arms on the end of a link 8. The opposite end of link 8 is pivoted to a rod 9 which in turn is received by the switch arms 10. The lower portions 11 of said switch arms are pivoted at 12 to the base. The upper portions 13 carry blocks 14: insulated from said portions by washers 15, and said blocks carry two armed spring plates 16 which are disposed to meet'pairs of fixed contacts 17 and 18, 19 and 20. Said fixed contacts have rods extending throu h the base, which serve-as=binding postsor .the

Specification of Letters fatent.

the attachment of a circuit terminal.

is a frame of Patented- Mar'. 15, 1910.

Application filed February 25, 1909. Seria1' No. 480,045;

terminals 21, 22, 23, wed-attached thereto by the usual nuts. In the inner section of the frame 2 is disposed "the smaller auxiliary solenoid 25, the core 26 of which passes through an opening in a horizontal inter mediate frame member 27 and when the solenoid is not energized rests on the lower horizontal frame member 5.

T he upper frame 'member 28 is detachable and 18 secured in place by screws, as shown in Fig. 2. A headed pin 29' passes through member 28 and into the solenoid i, and a similar headed pin 30 enters solenoid 25. A two armed lever 31 is pivoted in a lug on member 28 and its arms extend over pins 29 and 30.

32 is a bell crank circuit closer, pivoted at its angle toa rod 33 which extends through the base'and serves as a binding; post for The upper arm of said circuit closerhas connected to it a helical spring which normally keeps said arm against a fixed contact 34:, to the supporting rod of which the opposite circuit terminal is connected. The horizontal arm of bell crank 32 extends beneath a projection on lever 31. Finally under lever 31 is a helical spring which normally holds the arm of said lever above pin 29 in depressed position.

The circuits, as shown in F ig. 2, are as follows: The plus and minus conductors from ma in switch A are connected to fixed contact terminals 17, 19 and continue from contacts 18, 20. The minus conductor is connected by wire a to switch lever B. A contact 0 in the path of switch lever B connected by wire I) to one terminal-of solenoid 4, the other terminal of which is connected by wire (I to circuit closer a connected by wire g to one terminal of solenoid29, the other terminal of which is connected to the positive conductor in proximity to contact 20.

The operation is as follows: The main switch A being; closed, and the switchlever B closing circuit with contact 0, the solenoid 4: raises its core 6, lifting the end of link 8, and so swinging the switch arms 10 to cause thespring contacts '16 to meet and close circuit at the fixed contacts 17, 18, 19, 20. As

the linkgi8-i's raised, the roller 7 runs along the straight vertical edge of a guide bar 35 which may be integral with frame 2 and extends downwardly therefrom for a suitable distance, after ,which it turns at right angles and is secured to the base. When the core 6 has reached the limitof its upward movement, the link 8 stands horizontal and 35. In taking this position, the core Glifts pin 29'thus tilting lever 31 to swing the bell crank 32 and so open circuit at 34, thus deenrgizing the solenoid 4:. The core 6, however, cannot drop by gravity because of the thrustv of the toggle link 8 on the bar 35.

e The .positionof the parts is now as shown in Figs. 2 and 3. The switch B is now shiftedto close contact at f. This energizes auxiliary solenoid- 25 which raises its core 26 "which strikes pin' 30 and tilts'lever 31 in'thef opposite direction, thereby causing said lever to press down on pin 29. Pin 29 then pushes down core 6 of solenoid 4: which carries down the end of link- 8. As soon .as this linkis moved below a horizontal positioii,-its thrust against bar 28 is released, and the core 6 freely falls-by gravity carry ing the link 8 down with it andso-retractin switch arms 10, as shown in Fig. 4. WTien the lever B 'is-swung back to make contact at a, solenoid 4: is again energized and the operation already described is repeuted.

In order to prevent sparking when the s ring contact arms 10 are separated from t e fixed contacts, I attach to each arm by a leaf spring, a wiping carbon contact 36,

Fig. 5, which when circuit is closed, meets a similar contact 37 similarly supported on' thebase.

I claim:

1. In an electric switch, a pivoted circuit closing switch arm, a fixed guide bar, a link pivoted at one end to said arm and bearing at its other end on said bar, electromagnetic means for moving the end of said link along said bar to carry said arm into and lock the same in circuit closing position, and electro-' i magnetic means for releasing said arm.

2. In an electric switch, a pivoted circuit closing switch arm, a fixed guide bar, a roller movable along said bar, a link between said I closing arm, a link'pivoted to. said J vertical bar for guiding-said link and reclosing arm normally held open circuit position, a main solenoid, a core 7 5 roller and said arm, a solenoid, a vertically moving core therein connected to said roller and operating toraise the same to cause said link to move said switch arm and lock the same in circuit-closing position, a second solenoid, a vertically moving vcore therein, and'mechanism controlled by said second solenoid core for releasing said arm. 3. In an electric switch, a'pivoted circuit arm, a

ceiving the thrust'thereof, a solenoid, a ver-- tically moving core. for 'said solenoid con.-

nec'ted at its end to said link,'a second solenoid, avertically moving core therein, and intermediatemechanism for transmitting motion from said second solenoid core to said first solenoid core to cause said first core to be moved downwardly upon the'lifting of said second core by its solenoid.

4. Iii an electric switch, a pivoted circuit y gravity in therefor, a link mechanism between said core and saidarm for moving said arm into circuit closing position and there retaining said arin,-an auxiliary solenoid, a core therefor, sliding pinsgent'ering the said solenoids,

a support for said pins, and a pivoted lever having opposite arms respectively in proximityto said pins: whereby when said main solenoid core is attracted to operate said link mechanism to move said switch arm into circuit closing position, said core: shall actuateits associated sliding pin to tilt said lever and thereby move the other sliding in into said auxiliary-solenoid, and therea er when circuit is closed through said auxiliary SOlI10l(l,'tll core thereofis attracted to ac- I tuate its associated sliding pin to tilt said lever in the reverse direction and thereby move the first named sliding pin to move the main solenoid core to release said link mechanism and permit said switch arm to return by gravity to open circuit position.

In testimony whereof I have aflixed my signature in presence of two Witn sses.

FRANK W. SMITH.

lVitnesses: 4 M Y T. MGGARRY, GERTRUDE T. PORTER.

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