US1237649A - Apparatus for controlling electric circuits. - Google Patents

Description

0. I. IUDELSHON. APPARATUS FOR CCNTROLLING ELECTRIC CIRCUITS.

APPLICATION FILED IULY I0, 1915.

0. I. JUDELSHON.

APPARATUS TCR CoNTRoLLlNG ELECTRIC CIRCUITS.

APPLICATION FILED .|ULY|0,1915 n Patented Aug. 21, 1917.

2 SHEETS-SHEET 2 /-7( /QQ f OSCAR I. JUDnLsHON, or BROOKLYN, NEW YORK.

APPARATUS FOR CONTROLLING ELECTRIC CIRCUITS.

Specification of Letters Patent. Patented Aug. 21, 1917.

Application led July 10, 1915. Serial No. 39,182.

To all wkomz't maj] concern.'

' Beit known that I, OSCAR JUDELsHoN, af citizen of the United States, and resident `of New York city, borough of Brooklyn, in

'the county of Kings and State of New York, have invented certain new and useful 1mprovements in Ap aratus for Controlling Electric Circuits, ofP which the following is a specification.

@ne of the objects of my invention is to provide simple and eilicient means for controlling electric circuits, having special reference for operation in conjunction with means to apply a brake to a motor when the current is cut oii from the same, my invention being particularly applicable for use in conjunction with motors adapted to opcrate sewing machines and other machines where frequent stops are required.

A further object of my inventionis to provide a casing or box to in close the electric controlling devices and pro-vided with a coveror door that is adapted to control means to prevent operation ofthe switch armvof the apparatus in the event that th cover be left open.

A further object of my invention is generally to simplify and improve the construction of apparatus of the class specied.

My invention comprises novel details of improvement and combinations o-f parts ,that

will be more fully hereinafter set forth and then pointed out in the claims.

v Reference is to be had to the accompanying drawings forming part hereof, wherein, Figure 1 is a front view of a controlling apparatus embodying my invention;

Fig. 2 is a side view thereof: Fig. 3 is a View similar to Fig. 1, the cover being open;

Fig. 4 is a vertical section substantially on the line 4, 4, of Fig. 5;

Fig. 5 is a vertical section substantially on the line 5, 5, iniFigl;

Fig. 6 is a vertical section substantially on the line 6, 6', in Fig. 1; i

Fig. 7 is an enlarged detail substantially on the plane of the line 7, 7, in Fig. 2;

Fig. 8 is an enlarged sectional detail substantially on the plane of the line 8, 8, in

Eig. 3," and Fig. 9 is a side View illustrating my improvements supported in operative relation to a motor.

Similar numerals of reference indicate corresponding parts in the several views.

In the accompanying drawings the numeral 1 indicates a Casing, box or frame, which may be of any suitable construction, and which isshown provided with a cover or door 2, hinged to the casing at 3, and adapted to close the open side ofthe casing. By preference, the cover 2 ishingd at the upper part of the casing so as to depend in front of the same -to normally tend to close the opening in the casing. .As illustrated, the casing is adapted to be suspended from a support or table although the casing may be supported in any suitable manner. At 5 is' an electrical resistance shown in the form of a wire wound upon insulating block 6, which may be secured within casing 1 by screws 7 in a wellknown manner. At 8 are a series of contacts carried by an insulating block 9, which may be secured within the casing by screws 10 or in any suitable manner. The contacts 8 are in circuit with sucblock 9 vby means of screws 12 (Fig. 8) that pass through said block and the springs 11 and securely bind said contacts and springs on the block. At 14 is a switch arm shown located within the casing and pivotally supported therein as upon the shaft 15 journaled in the casing. Arm 14 is shown provided with a contact 16 which is shown in the form of a plug slidable in an insulating bushing 17 in arm 14, (Fig. 8), and adapted to engage either of the contacts 8. A spring 18 is' shown normally in engagement with Contact 16to maintain the latter in engagement with a contact 8, and spring. 18 is secured to arm 14, as by a screw 19, the spring' 18 and screw 19 being suitably insulated from arm 14. I prefer the above stated con# struction for conducting current through spring 18 to contact 16, rather than to have the arm 14 in the circuit of the resistance.

At 20 is a spring shown coiled around shaft 15 and adapted to cause arm 14 normally to rest with contact 16 in engagement with one of the end contacts of the series of contacts 8, the arrangement `shown being such that arm 14 is normally held against an adjustable stop 14l on casing 1 by said spring. For this purpose one arm of spring 20 is shown bearing against screw 19 and another arm of said spring is shown bearing against a terminal, such as a stud or screw 21 carried by and insulated from the casing. One of the lead Wires for the circuit, such as a wire from the street plug, may connect with stud or screw .21,v as by a suitable binding screw 22 connected with stud or screw 21. By this means should the spring 20 become broken the circuit through the casing will be broken t@ avoid danger. At 23 is a contact' carried by and insulated from the casing, and secured thereto by a screw 24. Contact 23 is to be in electrical connection with a line wire, and as a convenience for this purpose.I have shown said contact connected by a conductor, such as a metal strip 25, with a binding post orscrew 26 secured to and insulated from the casi-ng, from which binding screw a wire may lead to-one terminal of a motor 27, the other terminal of which motor may be connected to the service wire. At 28 is a movable contact adapted to coact with contact 23. Contact 28 is carried by an arm 29 that is pivotally supported by the casing, as at 30, the contact 28 being suitably insulated from said farm as by insulation at 31 (Fig. 7). At 32 is a spring coacting with contact 28 and shown connected with a post 33 carried by the casing, being shown supported by and insulated from a lug 34 projecting from the casing. Spring 32 tends normally to cause contact 28 to engage contact 23. lPost 33' is in electrical connectionn with the resistance 5 for which purpose I have shown a conductor, such as a metal strip 35 secured at one end to post 33 by nut 36, and secured at lthe other end to a band `37 that is clamped upon an end portion of resistance 5. Band 37 is shown provided with opposing ears 378L receiving screw or bolt 38 which serves to clamp the band securely in electrical Contact withfan end portion of resistance 5 and -to clamp strip 35 to the band. 'Oneof the contacts 11, such as the last of the series ofV such contacts, is shown in electrical engagement with band 37, being thus in circuit with an end portion ofthe resistance, while the other `contacts 11 are directly in engagement with said resistance at spaced distances. By the means described the strip 35 may be de- 'tached from post 33 or from band 37, whereby the resistance 5 may be readily removed from the casing without disturbing any connections, and, also, since the contacts 11 bear by spring pressure against the resistance and band 37, said contacts may be removed by merely removing block 9 without disturbing j other connections. Of course, if preferred, the end contact 11 may be in direct engagement with resistance 5 instead of through band 37. Spring 32 is included in the circuit of the resistance and should said spring break, the circuit will be broken to avoid danger.

The operation of contact 28 is controlled with the operation of arm 14, and circuit at 23, 28 is broken when arm 14 is at the normal position shown in Fig. 3, and contact at 23, 28 is closed just after arm 14 moves from its normal position and while the contact 16 is in engagement with the end contact 8, and the circuit remains closed while contacts 23 and 28 engage and any of the contacts 8 are engaged by contact 16. I havevshown arm 14 pivotally connected at 39 with a link 40, that is shown passing through an opening 1'* in casing 1, behind the cover 2, which arm is provided with a projection 41 shown adapted to engage the under side of arm 29 to raise the latter to break contact at 23, 28 when arm 14 returns to normal. Link 40 may be connected with any suitable device for operating arm 14, such as with a suitable treadle.

I provide means to prevent link 40 and arm 14 from being operated in case the cover 2 is` open, for which pur ose I have shown a movable stop 42V pivota ly supported at 43 within the casing,'and located in such position as to extend under projection 41 if the cover 2 is open, as illustrated in Fig. 5. A spring 44 coactin with stop 42 and with the casing normal y tends to rctain stop 42.under projection 41. Said Stop is shown provided with a pin or projection 45 adapted to engage cover 2, the parts being so arranged that when cover 2 is closed and pushes upon pin 45 the stop 42 will be pushed to one side of projection 41, as illustrated in Fig. 6, and so long as the cover is closed the link 40 may be operated to actuate arm 14. At 46 is a spring-acting catch carrled by the casingk and adapted to engage the cover to retain it closed, to thereby keep stop 42 pushed back from projection 41. This arrangement is of particular advantage in that should the operator leave the cover 2 open, he cannot operate arm 14, because stop 42 will then be under rojection 41 and circuit mustythen remain roken at 23, 28, since projection 41 cannot 'then be drawn down to allow arm 29 to descend, thereby requiring the cover to be kept closed in order to utilize the device. -It will be understood that the break in the circuit at 23, 28 occurring when the greatest resistance is in the circuit reduces sparking at the Contact 8 to reduce its`wear, 1t being a simple matter to replace contact 23 or 28.

In order to enable a brake to be applied to a rotative element, such as a pulley or brake drum 47 of the motor, or to a machine driven by the latter, I provide an arm 48 that is shown adjustably supportedat 49 upon a block 50, which 1s secured upon shaft 15, so as to rocky toward and from element 47 as arm 14 rocks. Arm 48l is provided with a suitable brake shoe 51 adapted to coact with element 47. The arrangement shown is such that when arm 14 is in the normal. position (Fig. 3), the brake shoe will be moved into engagement with element 47 vto check the rotation of the latter and when arm 14 isl swungdownwardly (lig. 3) the shoe 51 will be raised from an element 47.

In lorder to provide adjustment of arm 48 by said screws may be adjusted `in the required direction ,to swing arm 48 on itsv pivot, and when said screws are set tight against the arm, the latter will be retained in adjustedposition. Block 50 is shown set l in a recess in casing 1, whereby the wall of the casing may be integral.,

With/my improvements secured in posivtion with brake arm in coactive relation to When link is next drawnvdown an 'arm` 14 is moved, the projection 41,by descending from under arm 29, permits contact to be closed at 23, 28, while Contact 16 is in engagement with the yfirst Contact -8 of the se.

, ries to include the greatest resistance in the circuit. The circuit then will be from 21,

through spring 20, 19, 18, 16, 8, the corre-` will be correspondingly cut out, and on the return movement of arm 14 the resistance will be correspondingly cut in untll, just before arm 14 comes to rest against stop 14a.

and while contact 16 is in engagement with the upper contact 8, the projection 41 willA raise arm 29 and break the circuit at123, 24.` While I have illustrated the resistance 5 f wound upon the block or insulation 6 -in a single winding, it will be obvious that the .resistance may be provided in any .other wellknown manner, such as'a plurality of separate coils connected in series to the contact 28, and each coil respectlvely connected tact to coact with the irst named contacts, a

link connected with the movable contact to actuate the same, an arm mounted independently of the movable. contact, a contact operated-b57 said arm and connccted'to said resistance, a contact to coact with the last named contact, and means operative with said link to cause said arm to break the circuit of the last two named contacts when said movable cont-act is in the normal position and adapted to permit said movable contact to successively engage the first named contacts while the said two contacts are in Y engagement, a casing for said parts, a movable cover for the casing, and means to prevent operation of said movable contact when the cover is open.

2. The combination of a series of contacts, resistance material in circuit with said contacts at spaced distances, a movable arm carrying a contactto successively engage the rst named contacts, a link operatively connected with said arm, asecond arm provided with a Contact connected with said resistance, a contact to coact with the last named conv tact, and means coactive between said link and the second arm vto cause the latter to break the circuit at its contact when the irst named arm contactv is in engagement'with one ofthe irst named contacts, a casing for said parts, a movable cover for the casing," and means to prevent operation of said movable contact when the cover is open.

3. The combination of a casing having a movable cover, a movable switch arm carried by the casing, a series of contacts, a resistance in circuit therewith carri-ed by the casing,V

and means 'to prevent operation of said arm whensald cover 1s kopen.

' 4. The combination of a casing having a Y movable cover,'a movable switch arm carried by the casing, a series of contacts, a

Iresistance. in circuit therewith carried by the coaction with the `arm when the cover is closed.

5. The combination of a'casing having a movable cover, a movable switch arm carried by the casing, a series of contacts, a resistance in circuit therewith carried by the casing, a link connected with said arm and provided with a'projection, a movable stop in coactive relation with saidv projection to prevent movement of said arm when the cover is open, a projection interposed between the stop and cover to cause the stop to be held out of coaction with the projection of said link when the cover is closed, and means to retain the cover closed.

6. The combination of a casing having a movable cover, a movable switch arm carried by the casing, a series of contacts, a resistance in circuit therewith carried bythe casing, a link connected with said arm and provided with a projection, a movable stop, a 'spring to hold the stop in coaction with said projection of the link when the cover is open, a projection interposed between -the stop and cover to cause the stop to be held out of coaction with the projection of said link when the cover is closed, and means to retain the cover closed.

7. The combination of a casing,-a movable arm, a shaft supporting said arm and projecting through the casing, a contact carried by said arm, a series ofv contacts to coact with the first' named contact, resistance material in circuit with said series of contacts, a block carried by said shaft without the casing, an arm pivoted upon said block and provided with a brake shoe, and means coactive between said arm and block for react with the first namedy contact, resistance material in circuit with said series of con- -tacts, a block carried by said shaft without the casing, an arm pivoted upon said block andprovided with a brake shoe, and screws carried by said block adapted to coact with said arm on opposite sides of its pivot to retain the arm in set position.

Signed at New York city, in the countyy of New York, and State of New York, this 8th day of July, A. D. 1915.

OSCAR I. JUDELsHoN.

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