US788518A - Switch and connection controlling electric motors and power-transmitters. - Google Patents

Description

No. 788,518. v PATENTED MAY 2, 1905.

H. B. COHO. A SWITCH AND CONNECTIONS CONTROLLING ELECTRIC MOTORS AND POWER TRANSMITTERS.

APILIOATION FILED 51121217, 1903.

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PATENT OFFICE.

HERBERT B. COHO, OF MOUNT VERNON, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, OF ONE-HALF TO WHEELER & WILSON MANUFACTUR- ING COMPANY, A CORPORATION OF CONNECTICUT, AND THE EMERSON ELECTRIC MFG. CO.,OF ST. -LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

SWITCH AND CONNECTION CONTROLLING ELECTRIC MOTORS ANDPOWER-TRANSMITTERS.

SPECIFICATION forming part of LettersIEatent No. 788,518, dated May 2, 1905.

Application filed September 17, 1903. Serial No. 173,590.

To all whom it may concern.-

Be it known that I, HERBERT B. CoHo, a citizen of the United States, residing at Mount Vernon, county of Westchester, and State of 5 New York, have invented certain new and useful Improvements in Switches and Connections Controlling Electric Motors and Power- Transmitters, of which the followingis a specification.

This invention relates to an improved switch or cut-out and its connections with an electric motor and power-transmitter, and has for its object to provide simple, compact, and efiicient mechanism of this character so arranged I 5 that the switch may be very quickly adjusted to cutthe motor into and out of circuit to avoid injury to the switch-contacts and so that after cutting in the motor it will start and attain full speed before the power-transmitter is ad- 2 justed by the switch-controlling means for operating a machineto be driven.

The invention is more especially adapted for use in operating a sewing-machine; but it may be used in whole or in part for other electric 2 power-transmitting purposes.

The invention will first be described and then will be particularly defined in claims hereinafter set forth. 1

Reference is made to the accompanying 3 drawings, forming part of this specification,

. and in which- Figure 1 is a side elevation of my improved electric switch and connections as used with a sewing-machine motor, the switch being shown 3 5 open in 'full lines to cut out the motor. Fig. 2 is an enlarged detail plan showing the fulcrum portions of the controlling lever by which the switch is normally opened relatively to the power-transmitter on the motor-shaft.

4 Fig. 3 is a detail transverse vertical section of the preferred switch-contacts, taken on the line a a in Fig. 1. Fig. 4 is a front elevation of the parts of Fig. 1 with the power-transmitter shown in vertical section, and Fig. 5 is a bottom plan view of the switch or cut-out.

I will first describe the switch or cut-out, which is made with a base-plate 1, to which is held a binding-post 2, having suitable lugs, to which is fulcrumed the switch-lever 3. Insulation 4 is interposed between the base-plate and the binding-post. At its free end the lever 3 carries a suitable contact 5, preferably made in the angular V form shown in Fig. 3 of the drawings. This contact is adapted to engage a V-shaped binding-post contact 6, held to the base-plate 1, with an interposed insulation 7 A lug8 at the-heel of the switchlever strikes a cross bar or pin 9 on the bearing 2 to limit opening movement of the lever. A wire 10 connects the post 2 and the lever 3 with the binding-post 11 of the motor, to the other post, 12, of which one main line-wire, 13, is coupled, while the other main line-wire, 14:, is connected to the switch-contact 6 and so that when the switch is closed the motor 15 will be cut into the main line-circuit to operate a sewing or other machine through the agency of the power-transmitter, as hereinafter more fully explained.

The switch-lever 3 is provided with a transverse projecting pin 16, to which are connected the one ends of normallycontracting spiral springs 17 17, the other ends of which are coupled to another transverse piece, 18, fixed in a trip-lever 19, fulcrumed to lugs of a bearing 20, held to the switch base-plate 1. With this construction it is obvious that as the triplever 19 is tilted in opposite directions an imaginary line passing through the spring-holding pins 16 18 would pass above and below the fulcrum of the switch-lever 3, or, in other words, the springs will be moved across the fulcrum of the switch-lever, and consequently this lever will be closed or opened very quickly by the tension of the springs 17 as the triplever is actuated. I thus tilt the trip-lever by a controlling-lever which cooperates with the powertransmitter and the electric motor, as next described.

The outer end of the triplever 19 is coupled by a link 21 to a three-armed controlling-lever 22, which may be coupled by a rod 23 to a treadle or other means for swinging it up and down upon its fulcrum. This fulcrum is shown as a shaft 24, fitted loosely in lugs 25 on the motor-frame and carrying a fixed collar 26, preventing outward or endwise movement of the shaft and lever. A spiral spring 27 on shaft 24 is fixed at one end to the collar 26 and bears at its other end on the motorframe and normally swings the lever 22 and the link 21 upward, thereby tilting the triplever 19 to swing or hold the switch-lever 3 at position to cut the motor out of circuit, as shown by the full lines in Fig. 1 of the drawlngs.

The controlling-lever 22 has a cam 28, which as the lever is swung downward strikes a presser ring or cup 29 and moves it and the adjoining loose power and brake wheel 30 along the motor-shaft 31 to engage the Wheel 30 with the motor driving-wheel 32. Said wheel 32 preferably has an inserted face-strip 33, of leather or rubber, to give good frictional contact of the tWo wheels 30 32 for operating a sewing or other machine to the drivingwheel of which a belt 3 1 will pass from the wheel 30 of the power-transmitter. The outer end of the motor-shaft 31 and the laterally-movable presser device 29 and the hub of the wheel 30 have support in a bearing 35, located at the outer end of a yoke 36, forming practically a portion of the motor-frame. The control- Iing-Ie er 22 has a brake-surface 37, which is brought against a brake-rim on the wheel 30 to quickly stop said wheel and the sewing or other machine operated thereby as the switchlever 3 is opened to cut out and stop the electric motor 15. All the above-named switch, motor, and power-transmitter mechanism is shown supported by and beneath a table-top 38, on which the sewing or other machine isto be fastened in operative position.

Presuming the controlling-lever 22 is at its normal raised position, (shown in full lines in Figs. 1 and 2 of the drawings,) it will appear that it requires but a slight downpull of this lever to tilt the trip-lever 19 far enough to carry its pin 18 and the connected ends of the springs 17 above the fulcrum of the switch lever 3, and-this lever will therefore be quickly and positively-moved by said springs'to bring the contacts 5 6 together, as indicated by the dotted lines in Fig. 1 of the drawings, to close the circuit and start the motor and give it time to attain full effective speed before the cam 28 of lever 22 presses the power-transmitter wheel 30 to the motor driving-wheel 32 to start the sewing or other machine driven by the belt 34. On the other hand, as the lever 22 is automatically raised by the spring 27 or by the treadle-rod 23 said lever-cam 28 will be raised clear of the cup or presser device 29, thereby releasing the power-transmitter wheel 30 from the motor driving-wheel 32 and swinging the triplever 19 from the dotted position toward the full-line position of Fig. l of the drawings, and the instant the triplever pin 18 passes below the fulcrum of the switch-lever 3 the springs 17 will open the switch and carry said lever 3 to the fullline position, the switch-opening action being rapid enough to avoid burning of the contacts as the motor is cut out of circuit. About at this time the controlling-lever brake 37 is carried to the power-transmitter wheel 30 to stop it and the sewing-machine quickly and without injurious shock to any of the parts.

It is obvious that various changes in details of construction may be made by those skilled in this class of apparatus without departing from the spirit of the invention expressed in the appended claims.

I claim as my invention- 1. Electric switch and motor and powertransmitter connections, comprising two binding-posts, one serving as a contact, a switchlever fulcrumed to the other post and carrying a contact adapted to the first-named contact, an electric motor, a power-transmitter including a wheel loose on the motor-shaft, a controlling-lever adapted to engage the loose power-transmitter wheel with the motor driving-wheel, and means connecting said controlling-lever with the switch-lever including one or more springs which quickly open and close the switch as the switch-lever is adjusted by the controlling lever, substantially as described.

2. Electric switch and motor and powertransmitter connections, comprising two binding-posts, one serving as a contact, a switchlever fulcrumed to the other post and carrying a contact adapted to the first-named contact, an operating-lever, one or more springs connected to said operating-lever and .to the switch-lever and quickly opening and closing 7 the switch as the switch-lever is adjusted by the operating-lever, an electric motor, a power-transmitter including a wheel loose on the motor-shaft, a controlling-lever adapted to engage the loose power-transmitter wheel with the motor driving-wheel, and means coupling said controlling-lever with the switch-operating lever, substantially as described.

3. Electric switch and motor and powertransmitter connections, comprising a switch including two binding- posts 2, 6, the latter having a contact, a switch-lever 3 fulcrumed to post 2 and carrying a contact adapted to the contact on post 6, an operating-lever 19,

and springs 17 coupling the levers 3, 19, and actuating said lever 22, substantially as de- 10 adapted when lever 19 is operated to quickly scribed.

open and close the switch; an electric motor In witness whereof I have hereunto set my hlaving a shaft 31 and a driving-Yvleel 32 hand in presence of two witnesses. tiereon, a power -transmitter inc u ing a Wheel 30 loose on shaft 31, a spring-actuated HERBERT COHO' controlling-lever 22 having a cam 28 adapted Witnesses:

to bring the wheels 30, 32, in contact, a link WILLIAM J. Conn,

21 coupling the levers 19, 22, and means for CHARLES SIMMONS.

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