US1022904A - Centrifugal switch. - Google Patents

Description

G. J. WEBSTER.

GBNTRIFUGAL SWITCH.

APPLICATION FILED JULY 31, 1909.

Patented Apr. 9, 1912.

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CARROLL J'. WEBSTER, @IF LYNE, MASSACHUSETTS, ASSll'G-NGR TG GENERAL ELECTRL'G CGMPANY, .A CORPORATION' 0F YORK.

CENTRIEUGAL SWTCH.

Specification ci Letters Patent.

'Patented Apr. 9,1912.

iipv'plicationv filed July 3l, 1969. Serial No. 510,513.

To all. 'whom 'it may concern.:

Be it li'nown that 1, CARROLL J. ililnns'rnn, a citizen o t the United. States, residingat Lynn, in the 'county oi 'Essex and .State ot Massachusetts, have invented certain i'iew -and useful improvements in Centrifugal Switches, of which the following` is a specie ication.

My inventionl relates to centritugallyoperated. switches for alternating-current motors and is particularly applicable to small single-phase induction motors ot the type having a startinff winding which is open-circuited when the motor is up to speed. Such motors have heen provided heretofore with stationary collector rings concentric with the niotonshaft and a contact on each side of the motor-shaft and rotatable 'therewitin which bridges the collector rings at starting; hut. when the motor is up to speed are thrown away from the collector' rings by centrifugal force. Such contacts have the disadvantage thaty it they do not line np properly with the collector rings, they will not bridge them so as to close the circnitof the starting winding when the motor is starting.

My invention consists in a novel and siniple .torni o centrifugally-actuated switch adapted for use in such a structure whichenlarged end. view ot my cei'itrii'ugal switch;

and F ig. 3 is a side elevation of the switch of Fig..

In the drawing, 1 represents the stator of an alternating-current motor provided with a primary winding' 2, arranged in the usual manner. The rotor i3 I have shown, as being` provided with a. squirrel cage winding of well-known construction, comprisingv con ductors and end rings 5. The pair ot stationary collector rings 6 are concentric ,each pair together.

shaped member 10 is fastened to the rotor ot the motor and has bolted thereto two pairs ot studs 11 and 111. Each ot the contacts is pivotally mounted upon one of the stnds and has a slot 12 or 121 allowing it to move about the other stud of the pair to which the contact is pivoted. About each of these studsis an insulating hashing 13 upon which is nioi'lntcd a sleeve 14 ot-hrass or other goed electrical conducting material for electrically connecting` the contacts The contacts are also shown as being in contact throughoutv their length, which position they naturally occupy as the uptnrned portions 15 and 151 ot the contacts engage the turned edges of the col.

lector rings. The flexible tension members 9 each connect together a cont-act 8v and a contact S1. tened to the ends of the contacts which are provided with the slots. The uptnrncd portions 15 and 151 ot the contacts are also provided to .make goed electrical Contact with the collector rings.

When the motor is starting` the collector rings 6 are connected together by the contacts 8 and 81 so as to close the circuit oi the starting winding. When the motor. is up to speed the contacts S and S1 are thrown away from the collector rings hy centrifugal torce, overcoming the tension ot the tension members 9 so as to op'cn the circuit o't the starting;v winding.

lf do not desire to limit myself to the particular construction and arrangement of parts shown, hut aim inl the appended claims to cover all inodiiications which do not depart from the spirit and scope ot my invention.

lVhatl claim as new and desire to secure hy Letters Patent ot the United States, is,

1. In an alternating-current motor. stational-y collector rings concentric with motoihshatt', a pair of studs rotatable with The tension members are tas- .-1

the motor-shaft, a pair of contacts electri- 'cally connected together and arranged side by side, each of said contacts being pivotally mounted on one stud and having a slot allowing it to move about said other stud, and iexible tension members for pressing said contacts into engagement with the collector rings.

2. In an alternating-current motor, stationary collector rings concentric with the.

3,111 an alternating-current motor, stationary collector rings concentric with the motor shaft, two pairs of contacts pivotallj7 mounted and rotatable with the motor shaft, each pair of contacts being electrically connected together and arranged side by side, one pair of contactsbeing on the opposite side of the motor-shaft from the other pair, and two tension members,.one tension meinber connecting together a Contact of each pair and the other tension member connecting together the other contacts of each pair so as to press them against said collector. rings when the motor is starting.

4. In an alternating-current motor, stationary collector rings concentric with the motor-shaft, two pairs of studs rotatable with the motor-shaft, twoxpairs of contacts, the contacts of each pair being electrically connected together and arranged side by side, one pair of contacts being on the opposite side of the motor-shaft from the other pair, each of said contacts being pivotally mounted on 'one stud and having a slot allowing it to move about the other stud of the pair to which said first-mentioned stud belongs, and two tension members, one tension member connecting a contact of each pair and the other tension member connecting the other contacts of each pair so as to press them against said collector rings when the motor is starting. ln an alternating-current motor, stationary collector rings concentric with the' motor-shaft, two pairs of studs rotatable with the motor shaft, two pairs of contacts, the contacts of each pair being arranged side by side, one pair of contacts being on the opposite side of the motor shaft from the other pair, each of said contacts being pivotallyinounted on one stud and having a slot allowing it to move about the other stud of the pair to which said tiret-mem tioned stud belongs, two tension members, one tension member connecting a contact of cach pair and the other tension member connecting the other contacts of each pair so as to press them against said collector rings when the motoris starting, insulating bushings on said studs and electrically conducting sleeves on said bushings for electrically connecting said contacts together.

In witness whereof, l have hereunto set my hand this twenty-eighth day of July, 1909.

CARROLL J. WEBSTER.

Witnesses:

JOHN A. McManus, J r., Hrxnr O. VVnsTnNDaRP.

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