US973982A

US973982A - Pull-socket.

Info

Publication number: US973982A
Application number: US55794310A
Authority: US
Inventors: Ralph A Schoenberg
Original assignee: IDA S ROSENHEIM
Current assignee: IDA S ROSENHEIM
Priority date: 1910-04-27
Filing date: 1910-04-27
Publication date: 1910-10-25
Anticipated expiration: 1927-10-25

Description

R. A. SCHOENBBRG.

IIULL SOCKET. APPLIOATION FILED Amm, 1910.

Patented 0015.25, 1910.

2 SHEETS-SHEET l.

WIT/VESSES R. A. SGHOENBBRG.

PULL SOCKET. APPLIOATIN FILED Amm?, 1919.

973,982, y Patented Oct. 25, 1910.

2 SHEETS-SHEET 2.

W/T/VESSES /IWEIVTUH ATTORNEY UNITED STAWENT OFFICE.

RALPH A. SCHOENBERG, OF'NEW YORK, N. Y., ASSIGNOR TO IDA S. ROSENHEHVI OF NEW YORK, N. Y.

PULL-SOCKET.

Specification of Letters Patent.

Patented Oct. 25, 1910.

plest. form is a mechanical movement and is an improvement upon U. S. Patent- 921,969, patented May 18, 1909, on an application tiled by M. J Flynn. Vhile I have shown my invention applied to operate an electric switch in a pull socket,it is to be understood that in its broadest form, .it is, as,

noted, a. mechanical movement and an improvement upon said Patent 921,969, that it is adapted for universal application and is not to be limited to the particular use, which for purposes of illustration I have here shown.

Certain other features of my invention, relating more particularly to the pull socket, will be described more in detail in the speci fication and pointed out in the claims.

In the accompanying drawings'showing. an illustrative embodiment of this invention and in which'the same reference numerals refer to similar partsin the several igures,- Figure 1 is a vertical section taken through my pull socket.; Fig. 2 is a horizontal section on the lineA 2 2 of Fig. l, looking up in the direction of the arrows; Fig. 3 is a horizontal section on the line 3 3 of Fig. 1

looking up in the direction of the arrows;

Fig. 4 is a plan View' substantially on the line 1 -4 of Fig. 1 looking down in the direction of the arrows; a portion of the figure tected; Fig. 8 is a horizontal section substantially on line 8,-8 of Fig. 1 ;l Fig. 9 is a perspective view of the screw shell contact with its wipers or spring contacts; Fig. 10 is a detail perspective view of a portion of the mechanismwith the contacts arranged in position to showtheir coperation with the contact plates carried by the driven member; Fig. 11 Ais a perspective view of the chain rail vor carrier.;.'Fi-g. 12 is a perspective View' of the preferred form of tension member to retract the chain and chain lrail or carrier; but not the driven4 memberyor the gear wheel which in the form shown is a portion of it; Figs. 9, 10, 11 and 12 are arranged in juxtaposition so as to clearly show the manner of assembling the 'different parts'of the internal mechanism of my pull socket; Fig. 13 is a perspective viewof the chain rail or carrier; Fig.V 14r is a diagrammatic view showing the passage of the current in 'myV double pole socket; Fig. 15 is a diagrammatic-view of the wipers or contact plates and the position that they assume on the `lower surface of thedriven member when vthe pull socket is in the position to cut off the current which is theposition of the parts immediately succeeding that shown in Fig. 14; Fig. 16 is a diagrammatic View 'of the contacts or wipers showing the passage of the current when the parts are in the next position immediately following that shownv in Fig. 15 by which it will be seen, inthe form shown, that the polarity of the double pole socket is changed; and Fig. 17 is a plan view ofA the driven member reversed showing the preferred arrangement of the connecting and completely surrounds and protects the y internal mechanism of the pull socket. In the form of myinvention shown the casing or receptacle 2 and the shell contact 3 are secured together by a single metallic arbor or axle 4. The end .9 of this metallic arbor,- or axle 4 is preferably screw threaded and coperates with a nut 10 which is prefer` ably seated in a recess 11 in the upper portion of the insulating casing'or receptacle 2. Through the mouth 5 of the side or shell contacts I insert a center spring contact 6 having two arms 7 and 8, the former being held securely in place by the head ofthe metallic arbor or axle 4, while the latter end `lor.

8 is left free to be bent so as to permit the' ready assembling of the parts.

Between the screw shell contact 3 and located within the hollow interior of the ou`e piece insulating casing or receptacle 2 are cooperating portions of my mechanical movement applied to a pull socket. Both the casing or receptacle 2 and the shell contact 3 are surrounded by the usual housing 100 and insulation 101.

Mounted on the metallic axle -or arbor 4 and within' and completely protected by the insulating casing or receptacle 2 I mount rotatably a driven member 12 which is preferably formed of some suitable insulating material. This driven member 12 has its undensurface provided with a plurality of inclines or cams which abruptly terminate and form what may be termed for the purpose of this specification hills and valleys. The upper surface of the driven member is provided with two reduced hubsv 13 and 17 of different diameters. The reduced hub 13 forms on the driven member 12 a cylindrical revolving shelf 14 upon which a portion of the driving member 15, which will be hereinafter described in detail, rests.' The driven member 12 4is also provided with a friction engaging member 16 secured to the driven member in any suitable manner. This friction member 16 is preferably, though not necessarily, formed as a wheel provided with suitable teeth or projections to coperate with the driving member 15 as will be more fully hereinafter described. For the purposes of economy in manufacture I preferably make this friction member 16 in the form of a metallic gear wheel preferably stamped, for the sake of cheapness in manufacture, from sheet metal and secured in any suitable manner to the insulating driven member 12.

On the smaller hub 17 I mount a portion of the chain rail or carrier 18. The particular form of chain rail or carrier which I have shown and preferably, though not necessarily, use is provided with a portion which extends down and substantially rests upon the shelf 14.

Variousnumbers of hills and valleys may be used on the underside of the driven member, 12. Simply for purposes of illustration I have shown, but it is to be understood that my invention is not to be limited to this or any particular number or form, eight such hills and valleys and mount on some of them conducting plates. As shown I have mount ed two conducting

plates

19, 19 in a peculiar manner. Each of these

plates

19, 19 has portions which snugly fit on two of the hills and valleys, leaving between them one hill and valley blank, or. without a conductin member. (Figs. 14, 16 and 17.) It wil therefore be seen that every other hill and valley is provided with a conducting member and that two ofA the conducting members are connected together, which in the form shown makes my pull socket, with the other mechanism hereinafter described, a double pole socket, but of course it is to be understood that a single pole socket may be used if desired. For many purposes, however, a'double pole socket is much more advantageous as it multiplies the number of contacts for the `current and permits the making and breaking of a current of higher voltage without danger to the internal mechanism of the socket.

Mounted upon the smaller hub or r duced portion 17 of the driven member 1 is a member for retracting the flexible driving member 15. This member may be formed in various ways. I have however found in practice that a member such as 18 (Figs. 1, 11 and 13) and which I term a chain rail or carrier, performs very satisfactorily the requisite function of holding one end of the chain or driving member 15 free and distinct from the rotating contact plate which as here shown is the driven member 12. This chain rail or carrier 18 is preferably, though not necessarily stamped out of one piece of met-al having a body member 20 (Fig. 13) and preferably, 'though not necessarily, one or two

tension members

21, 21 which normally contact with the flexible driving member 15 and serve to substantially press it normally out` 0f engagement with the teeth of the gear wheel 16, so that the chain rail 18, together with the flexible driving member 15, can readily be retracted after pressure is removed from the flexible driving member or chain to permit the parts to again assume their normal position and be in readiness to operate the switch mechanism uponthe next succeeding 'pull upon the chain or flexible driving member 15. It is of course to be distinctly understood that this retracting movement of the chain rail or carrier and the driving member 15 is entirely free from the driven member which is not retracted but continually revolves on the metallic arbor or axle 4, step by step, as thel current is switched on or off by successive pulls u on the driving member 15. It is immaterial how this carrier or chain rail 18, together with the driving member 15, is retracted provided that the gear Wheel or friction member 16 with which the chain contacts isV not moved. vI have found in practice that a' very efficient manner of retracting the chain carrier or chain rail is by means of a tension member 22 (Figs. 12 and 8) which is preferably in the form of a spring having one of its ends 23 taking behind a lug 24 on the chain carrier 18, Fig. 11, its other end being preferably coiled to forma screw thread (Figs. 8 and 12) and to coperate with the threads vupon a screw 124 which passes through an operated the driven member 12-one step in its revolution.

On the upper portion of the one piece insulating 'casing or receptacle 2 I providecan opening 39 having cut away shoulders 4.0, 40, Fig. 4 to formyguides or

seats

41, 41 for a segmental shaped member 42 which forms the base or supporting member for the horn'- 43 through which the driving member 15 passes. This segmental shaped member `42 is preferably formed of metal and may or may not be formed integral with the horn 43. Preferably the horn 43 is'secured toit in any suitablelmanner and I have found in practice that an eflicient manner of securing the member 42 in t-he seats or guides 41 is by forming this member 42 of .spring ma terial and contracting it permitting it to' spring into its operativeposition so that the resiliency of the member 42 will tend to keep it seated in 'the guides or socket-s 41.

The interior of the member 42 serves also to guide the flexible driving member. This driving member to which power is applied is preferably in the form cfa chain such as I have shown by way of example and des ignated 15, though, of course, it is tQ'be understood that any -other l suitable flexible driving member may be used. One end of this driving member 15 is detachably secured to the chain rail or carrier in any suitable manner. By way of example I have provided the chain rail or carrier with

ears

25, 25 which are preferably, though notnecessarily, formed integral with the body member 20 and bent up so as to receive one of the balls or spheres 26 between them' Fig. 6). It will be readily seen that this-is a very eticient, easy and quick method of detachably connectingvthe flexible driving member with the chain rail.y

In the particular form of myinvention illustrated,` the

tension members

21, 21 rest substantially upon the shelf 14, as noted, and nearer the axis of the driven member 12 than the driving member 15. A pull u on the chain or driving member 15, one en of which substantially encircles the gear wheel 16, will cause the

ears

25,25 and the chain rail 'or carrier 18 to rotate. Pressure upon this flexible driving member or chain 15 however tends to cause it to describe a preferred construct-ion. kWhen the pressure upon'the driving member 15 has suiiciently reduced the diameter l of the circle within which the driving member normally lies,

such as shown in Fig. 6, the balls or spheres of thedriving member 15 will bind, contact or bite on thev side. of the teeth of the gear wheel 16. Further pressure upon the driving member 15 will then cause the gear wheel 1 6, together with the driven member 15, to move with it which will impart to the driven member 12- a partial rotation. This movementjin the use to which my invention is here put will cause the switch mechanism within the pull socket to be operated either to make or break the circuit as the lcase may be. This partial rotation of the chain carrier 18 is performed against the action of the spring 22, Fig'..12, the lug 24 of the chain rail or carrier contacting with the end 23 ofthe spring 22 so that a partial revolution A of the chain carrier l18 tends to storev up power in the tension member 22, the amount of which, as previously noted, can be regulated in the preferred construction by means of the screw 124. This' tension member or spring 22 preferably surrounds the reduced hub 17 -of the driven member 12 and:l rests on the shoulders 27 on, the interior of the casing or receptacle 2.

By releasing the pressure upon the driving member 15 the action above referred to is partially reversed, it, of course, being dis tinctly understood that the driven member 12 withvits friction or gear wheel 16 and its contact plates 19, 19v is never reversed., The tensionmember 22 will then use its stored up energyand etract the chain rail or -carr1er V'18, with its flexible driving memberl -15' y to theirV original position, the balls or spheres of the chain slipping by the teeth of the gear wheel 16, and not operating the same on this retraction of the assist this operationl may, though not necessary, use one or more tension members such as 21-21 which serve to yieldingl press the flexible driving member outward y and away from the teeth of the gear wheels 16. It is to be understood, however, 4that my-devvice will operate successfully without such tension members for the balls of the chains will readily slip by the teeth of the gear wheelsl.

In ada ting my mechanical movement to operate t e switch mechanism -of a pull socket various forms of contacts may be used. Preferably I use my mechanical movement to make a double pole lpull socket which will now be described.

In.the form of my invention here illustrated `I have show n by way of example the under-surface of my driven member 12 rovided Awith the plurality of hills and val eys v as noted and

connectin plates

19, 19 which have been previously escribed. Coperatmg with these plates I preferably provide parts. To v four yielding spring contacts or wipers. Fastened to the screw shell 3 (Fig. 9) I secure in any suitable manner a spring contact 28 and also extend through the screw contact 3 a spring contact or wiper 29 which connects with the end 7 of the center contact plate 6 by means of a connecting member 30 (Fig. 2). This spring contact is insulated from the screw contact 3 by means of a fiber washer or other suitable insulation 31 (Fig. 9) which preferably lies on the exterior of the screw shell contact, a similar insulating washer 132 being located upon the interior of the shell contact. It will therefore be seen that there are two spring contacts or wipers 2829 associated with the screw contact 3.

The binding post 32 (Fig. 1) is connected in any suitable manner with the conducting wiper 33 which has a bent end 34 extending into the path of the

contact plates

19, 19 carried by the driven member 12. The other binding post 35 is similarly connected with a contact 36-having a bent arm 37 which forms a spring contact or wiper and is also in the path lof the

plates

19, 19 carried on the hills and valleys of the driven member 12. By vthis arrangement of four flexible contacts or wipers, with the particular form of connecting

plates

19, 19 carried by the driven member 12, I obtainv a double pole socket and one which, 'as previously noted, is of marked advantage in thatit permits a higher current to be switched on or off than a single pole one without the danger of arcing or burning out the interior mechanism and consequently such a pull socket can obtain a much higher .rating by the Board of Underwriters which pass upon and .control the installation of all electrical appliances in this country. Y

Not only is my pull socket a double pole socket, but in addition thereto inthe form as here shown, but to which my invention is not to be limited, it is a pull socket of reversible polarity. This perhaps will be most clearly seen in Figs. 14, 15 and 16, which are diagrammatic views showing the path of the current in the different positions of the wipers or spring contacts. In Fig. 14 for instance the wipers or flexible contacts are. shown in their o erative position in contact with the

connectlng plates

19,19, the current flowing in the direction of the arrows from the positive to the negative binding post and through the resistance 38 which may obviously be a lamp, motor, electrolytic bath, or any other consuming device. When the parts are in the position shown in Fig. 14 and it is desired to cut olf the current a pull upon the driving member 15 will, in the manner previously described at length, partially rotate the driven member 12 upon the metallic axle or arbor 4, and

bring the wipers into contact with the barek or non-conducting portions of the hills and valleys upon'l the driven member 12 and consequently no current will pass through the consuming device 38. This is the position as shown in Fig. 15. The next pull upon the driving member 15 will give the driven member 12 another partial rotation and bringthe wi rs and

contact plates

19, 19 into the position shown diagrammatically in Fig. 16 wherein it will vbe seen that the current is now reversed through the consuming device `38 and consequently the polarity is changed orreversed which is a marked advantage in many situations. While .I preferably use a double pole switch and, further, one of reversible polarity, it is. to be distinctly understood, however, that my invention is not to be limited to this construction though it is the preferred form;

Having thus described this invention in connection with several illustrative embodiments thereof, tothe details of which I do not desire to be limited, what is claimed as new and what it is desired to secure by Letters Patent is set forth in the appended claims. a l 1. In a mechanical movement the combination of a rotating drivenv member, an axle or arbor upon which vthe member rotates, a flexible driving member adapted to contact directly with the driven member and a chain rail or carrier connected to the driving member and means to retract the chain rail and driving member.

2. In a mechanical movement the combination of a rotating driven member, an axle or arbor upon which the member rotates, la flexible driving member adapted to contact directly with the driven member, av

chain rail or carrier connected to the driving member. mean-s to retract the chain rail and driving member7 and means tending to prevent the driving member engaging' with the engaging surface of the Adriven member upon the retraction of the chain rail or carrier and the driving member.

3. In a mechanical movement the ombi nation of a rotating driven member, an axle or arbor upon which the member rotates, a flexible driving member adapted t0 contact directly with the driven member, a chain rail or carrier connected to the driving member, and adjustable means to retract the chain rail and driving member.

4. In a mechanical movement the combination of a rotating driven member, an

axle or arbor upon which the member rober.

6. In a mechanical movement the combination of a rotating driven member, an axle or arbor upon which the member rotates, a flexible driving memberadapted to contact directly with the driven member to operate it, a chain rail or carrier connected to the driving member, an adjustmg screw, a spring, one end of the spring engaging with the carrier and the other end connected to the adjustmg screw.

t. In a mechanlcal movement the comb1- nation of a rotating drlven member, an

.axle or arbor upon which the member rotates, a iexible driving member adapted to contact directly with the driven member, a chain rail or carrier connected to the driving member, a screw and a spring, one end of the spring being coiled to cooperate with the threads of the screw to adjust the tension of the spring.

S. A mechanical movement having a rotatable driven member, an axle orv arborA on which the member is mounted, a friction member connected to the driven member, a flexible driving member adapted to directly contact with the friction member, achain carrier or rail connected to the driving member, one or more springs carried by the chain rail or carrier to normally keep the driving member from engagement with the friction member mounted on the driven member, and means to retract the driving member and chain rail or carrier.

9. A mechanical movement having a rotatable driven member, an axle or arbor on which the member is mounted, a friction member connected to the driven member, a iiexible driving member adapted to directly contact with the friction member, a chain carrier or rail connected to the driving member, an integral spring or springs carried by the chain rail or carrier to normally keep the driving member from engagement with the friction member mounted on the driven member, and means to retract the driving member and chain rail or carrier.

10. A chain rail or carrier for a mechanical movement comprising a body member, and one or more integral spring tension members adapted to Contact and coperate with a chain.

11. A chain rail or carrier for a mechanical movement comprising a body member, one or. more integral spring tension members'adapted to contact and cooperate with a flexible driving member, said chain, rail or carrier being Iprovided with fastening means to cooperate with a flexible driving member.

-bers adapted to contact and coperate with a chain, one or more ears and an integral lug struck up from the bod-y member.

14. A chain rail or carrier for a mechanical movement comprising a body member, one or more tension membersladapted to contact and coperate with a flexible driving member, and provided with means to cooperate with and detachably secure a ilexible driving member.

15. In a pull socket for an electric consuming device comprising in combination fixed spring contacts, means to make a double .poledouble make and double break electrical connection between the fixed spring contacts and the consuming device and to reverse the polarity of the consuming device.

16. In a pull socket the combination of binding posts, separate center and side contactsand means to make a double pole double make and double break electrical connection between the center and side contacts and to reverse the polarity of the side and center contacts'.

17. In a pull socket the combmation of a one piece insulating casing or receptacle/entirely closed except at the bottom to confine entirely within the closed receptacle all possible sparks and thereby protect the operator from any danger due to arcing,.a switch mechanism mounted in and protected by the one piece insulating casing or receptacle,

a screw shell contact closing the bottom of the one piece insulating casing or receptacle and means to connect the screw shell and insulating casing or receptacle together.

18. In a pull socket the combination of a one piece insulating casing or receptacle, operating mechanism to make and break the electrical connection mounted within and protected by the one piece casing or receptacle, a screw shell contact mounted beneath and closing the bottom of the insulating casing or receptacle, and a single axially arranged connecting member connecting the screw shell with the insulating casing for receptacle said axially arranged member adapted to coperate with the operating mechanism.

19. In a pull socketthe combination of a one piece insulating casing or receptacle,l a driven member mounted within the. casing or receptacle, a screw shell contact closing the bottom of the insulating casing or receptacle, a metallic arbor or axle connecting the screw shell with the insulating casing or receptacle,said driven member being mounted upon said axle or arbor, and means to give the driven member intermittent rotary movement.

20. In a pull socket the combination of a single integral insulating casing or receptacle, aninsulating'driven member mounted Within and protected by the insulating casing or receptacle, a screw shell contact closing the bottom oit` the insulating casing or receptacle, a metallic axle or arbor securing the screw shell contact to the insulating casing or receptacle, contact plates carried by the driven member, spring contacts adapted to bear upon the driven member and hold it in its operative position, and means to give the driven member a step by step rotation.

2l. In a pull socket the combination of a single one piece insulating casing or receptacle, a driven member provided With hills and valleys mounted Within the insulating casing or receptacle, conducting plates carried on some of the hills and valleys of the driven member, yielding spring contacts or Wipers adapted to bear upon the hills and valleys and hold the driven member in its proper position upon the axle or arbor, a screuY shell or side contact closing the bottom of the one piece insulating casing or receptacle, a metallic arbor or axle-passing through the driven member and securing the side or screw contact to the one piece insulating casing or receptacle, and a flexible driving member adapted to give a step by step rotation to the driven member.

22. In a pull socket the combination of a single one piece insulating casing or receptacle, a driven member provided with hills and valleys mounted Within the insulating casing or receptacle, conducting plates carried on some of the hills and valleys of the driven member, yielding spring contacts or wipers adapted to bear upon the hills and valleys and hold the driven member in its proper position upon the axle or arbor, a screw shell or side contact closing the bottom of the one piece insulating casing or receptacle, a metallic arbor or axle passing through the driven member and securing the side or screw shell contact to the one piece insulating casing or receptacle, a flexible driving member adapted to give a step by step rotation to the driven member, a chain rail or carrier connected to the driven member, and means to retract the chain rail and driving member Without retracting the driven member.

23. In a pull socket the combination of a single one piece insulating casing or receptacle, an insulating driven member provided with hills and valleys mounted Within the insulating casing or receptacle, conducting plates carried on some of the hills and valleys of the driven member, yielding spring contacts or Wipers adapted to bear upon the hills 'and valleys and hold the driven member in its proper position upon the axle or arbor, a screw shell or side contact closing the bottom of the one piece insulating casing or receptacle, a metallic arbor or axle passing through the driven member and securing the side or screw shell contactto the one piece insulating casing or receptacle, a'tlexible driving member adapted to give a step by step rotation to the driven member, a chain rail or carrier connected to the driven member, means to retract the chain rail and driving member without retractiug the driven member, a friction niembcr carried by the driven member and adapted to contactdirectly with the iexible driving member, and yielding means normally acting to prevent the iexible driving member contacting With said friction member.-

24. In a pull socket the combination of a single insulating casing or receptacle, a screw shell contact closing the bottom of said casing or receptacle, an insulating driven member provided with hills and valleys mounted Within the casing or receptacle, a metallic arbor or axle passing through said driven member and connecting the screw shell and the said casing or receptacle, a plurality of spring contacts or wipers acting upon said hills and valleys ot the driven member, and means including said plurality of iiexible contact members or wipers to form a double pole connection between thc center and side contacts.

In a pull socket the combination of a 'single insulating casing or receptacle, a

screw shell contact closing the bottom of said casing or receptacle` a driven member provided with hills and valleys mounted within the casing or receptacle, a metallic arbor or axle passing through said driven member and connecting the screw shell and the said casing or receptacle, a plurality of spring contacts or Wipers acting upon said hills and valleys of the driven member, and means including said plurality of exible contact members or Wipers forming a double pole connect-ion between the center and side contacts and means to reverse the polarity of the consuming device.

26. In a pull socket the combination of a horn and spring means to connect it to the socket.

27. In a pull socket the combination of an insulating member provided with a cutaway portion on its periphery and a segmental member carrying a guiding member or horn adapted to fit in and till said cut away portion.

28. In a pull socket the combination of a circular insulating member provided ivith a cut-away portion having under-cut shoulders and a segmental member carrying a guiding member or horn adapted to coperate with said under-cut shoulders and be held thereby.

v 29. In a pull socket thecombination of a circular insulating inelnber provided With a cut-away portion having undercut shoulders and a resilientsegmental member carrying av guiding member or horn adapted to be yieldingly 'held by said undercut shoulders.

30. In a pull socket the combination of a one piece insulating casing or receptacle, a screw. shell Contact closing the bottom of said casing or receptacle, a rotary insulated driven member mounted on a` metallic arbor or axle, a metallic arboi' or axle connecting the receptacle and screw shell, a metallic gear Wheel connected to and moving with the insulating driven member, a iexible driving member/adapted to contact directly with the teeth of the gear wheel to rotate the driven member, and means to retract the driving member.

31. In a pull socket the combination of a one piece insulating casing or receptacle, aA

screw shell contact closing the bottom of said casing or receptacle, a rotary insulated driven member mounted on a metallic arbor or axle, a metallic arbor or axle connecting the receptacle and screw shell, a metallic gear Wheel connected to and moving with the insulating driven member, a iexible driving member adapted to contact directly with the teeth of the gear Wheel to. rotate the driven member, a chain rail or carrier and means to retract the said chain vrail or carrier and flexible driving member.

32. In a pull socket the combination of a one piece insulating casing or receptacle, a

'driven member mounted Within the casing or receptacle, a screw shell contact closing the bottom of the insulating casing or receptacle, an arbor or axle connecting the screw shell With the insulating casing or re,- ceptacle, said driven member being mounted upon said axle or arbor, and means to give the driven member intermittent rotary movement.

and a bent spring center contact mounted Within the shell Contact vand having one arm held by the arbor or axle and the other free and adapted to be bent out of the Way t0 assemble the axle and arbor with the other parts of the mechanism and then be bent back over the other arm to form a center spring Contact.

34. In a pull socket the combination of a casing or receptacle provided With a lcut away portion on its periphery, a flexible driving member connected to a chain rail, a driven member, a chain rail, a removable member adapted to fit in and lfill the cut away portion of the casing or receptacle and assist in holding theflexible driving member on the chain rail.

3 5. In a pull socket the combination of a.' casing or. receptacle provided with a cut away portion on its periphery, a flexible driving member connected to a chain rail, a driven member, a chain rail, a removable member adapted to it in and fill the cut away portionv of the casing or receptacle and assist in holding the flexible driving 'member oni they chain rail, said -removable member being yprovided with a horn through which the flexible driving member passes. v

RALPH SCHOENBERG.

Witnesses ALAN M. JOHNSON, Rosa M ENK.