US1790321A - Sujctric meter service - Google Patents

Description

Patented Jon. 27,.l i931 i, ,si

'Josera sacas, marrone, connncrrcn'r smentire-.trarne snrzvrcn srrnrsrrcn @riginal-application filed February '3, 'lSa'Aseral Ito. Maese. minded and this application annery is, rese. serial ne. aimee.

Mms, which this present application is a n; ision.

'lhe object of the present invenion is to,

provide in combination with a fused switch. appliance ot the type referred to suitable meter testing facilities which are conveniently located and which are supported and connected in a novel and advantageous manner.

lln the accompanying' drawings ll have shown one embodiment of the invention but it will bepunderstood that the drawings are intended for illustrative purposes only and are not to he construed as defining or limiting the scope ot the invention', the claims forming a part of this specification being reliedupon for that purpose.

0f thedrawings:

Fig. l is a front view of an appliance embodying the invention the front cover being broken' away to show interiorparts.

Fig. 2 is a bottom View of the fused switch appliance, this view also showing the enclosing cabinet in section.

Fig. 3 is a fragmentary side view of the parts shown in Fig. l, certain portions of the enclosing cabinet being shown in section.

F ig. 4'is a fragmentary iront view similar to Fig. l but showing the fuse base and one of the blocks carrying the testing elements removed in order that other parts may be more clearly shown.

Fig. 5 is a fragmentary vertical sectional view taken along the line 5 5 of Fig. l.

Fig. 6 is a fragmentary vertical sectional view taken along the line 6-6 of Fig. 4.

Fig. 7 is a fragmentary vertical sectional View similar toy Fig. 5 but showing an alternate embodiment of the invention.

[n theembodiment of the invention shown in the drawings, there are two pairs of fuse contac and two separate switching devices, but it will be understood that the invention is not necessarily limited to any particular number of ,fuses and switches. The fuse and switch contacts and also the meter testing facilities are shown symmetrically disposed with respect to the vertical central plane or the appliance, and for the salie oit convenience and simplicity of description, il will describe detail only Ythose parts on one side of the said plane, it heing understood that the on the other side are, or may be, the saine in construction except for reversal ot positions.

Fuse receiving contacts l. and 2 are provided on the front face or an insulating base 3. Means are provided Qlor supporting they base 3 in tired spaced relationship to a rear support. il lien there is an enclosing1 cabinet this support may be the rear wall or the cabinet. the fuse contacts as shown are adapted tor receiving a cartridge enclosed tuse such as F, but it will be understood that the invention is not limited for use withiiuses or this particular type.

ln addition to the main rear support, l prefer to also provide an independentinsulating supporting device which is ordinarily secured to the main rear support hut` which is ,nevertheless separate therefrom. This supporting device is shown at 4, 4 in the drawings and may comprise two separatedhars or insulating material. `lflhen such a separate supporting device is provided, the fuse' contacts and the base are also normally held in lined spaced relationship therewith.

Preferably, a plurality ot supporting elements are provided which are connected at their forward portions with the base and at 'their rear portions with the main rear support, preferably indirectly by means or the separate supporting device 4, 4. The supporting elements are preferably formed ot metal and they serve to support the inse contactsand the base in the described relationu ship with the said rear support. As shown, there are at least two such supporting elements :for each pair et fuse contacts, these being represented at 5 and 6 respectively, The supporting elements/5 and 6 are shown as being Z-shaped, but as to this there may loe variation. The supporting elements have their rear portions connected with the suporting device 4, 4 by means of screws 7, 7. uitable means such as screws 8, 8 are provided for mechanically connecting the forward ortions of the supporting elements with t e fuse base 3, the screws extending through holes 9, 9 in the said base. These screws 8, 8 preferably also serve to electrically connect the v:fuse contacts with therespective su porting elements, but I do not necessarily unit myself to the use of the same I screws or other holding means for providing both mechanical and an electrical connection.

Located at least in part in the space behind a vertical plane extending through the rear` l ed directly upon and electrically connected with corresponding supporting elementsv 5 and 6. One or both of the supporting elements 5 and 6 are electrically connected with one or both of the fuse contacts 1 and 2.

Preferably each of the said switch contacts 10 and 11 is one of a pair. The other contacts of the airs are shown at 12 and 13 respectively an they are similar res ectively to the contactslO and 11 but opposltely positioned. Two pairs of stationary switch contacts are shown but the invention is not so limited. Contact supporting elements 14 and 15 are provided for the contacts 12 and 13, these preferabl being similar to the main supportin e ements 5 and6 and being similar y secure to the supporting device 4, 4 as by screws 7 7. Connected with each supporting element 14 is a wire connecting terminal 16. I have shown a terminal of the solder lug type, but I do not so limit myself. For establishing or breaking electrical connection between the `switch contacts of the said pairs 10,12 and 11, 13, I preferably provide for each pair a switching element which is rectilinearly movable substantially parallel with the front face of the supporting device and with the rear face of the' fuse base. When. there are two pairs of stationary switch`cont-acts there are two conducting switching elements 17 and 18 insulated from each other and adapted respectively to engage and discngage the said stationary switch contacts. The two conductin switching elements 17 and 18 are preferab y carried by an insulating element 19, which with the said conducting elements constitutes a rectilinearly movable switching member. rlhe insulating element 19 is preferably in the form of a flat plate, the said conducting elements 17 and 18 extending through it and projecting somewhat beyond the opposed surfaces thereof as shown. The details of the switching member may be as shown in my patent for amasar electric circuit controlling appliance, No. 1,754,444 issued April 15, 1930. When the stationary switch contacts are located as shown, the said flat insulating element 19 is arranged perpendicularly to the supporting device and to the fuse base. The said element may extend into a groove 20 formed in the base 3.

From the foregoing description, it will be apparent that when the switching member is in the on position as shown, a circuit will be established from the wire connecting terminal 16 through the contact supporting element-14 and the switch contacts 12, 17, and 10, to the supporting element 5 and thence to the fuse contact 1. Similarly a connection is established from the fuse contact 2 through the supporting element 6 and the switch contacts 11, 18 and 13 to the contact supporting element 15. When the switching member is moved upward from the position shown, the.v elements-17 and 18 will be disengaged from the stationary switch contacts and circuit'will be broken at two points at each side of the fuse, thus making a total of four breaks. Although the switching member is guided between the base 3 and the supporting device 4, 4 and is held by these parts against forward or backward movement, it is entirely free to adjust itself laterally to conform to the positions of the several stationary switch contacts. f

When there are two switching devices as shown and described, there may be provided an insulating baie plate 21 located between them. This isshown as being held in a slot in the fuse base 3.

I have shown an enclosing cabinet 22Y of sheet metal having a rear wall 23, side walls 24, 24 and end walls 25 and 26. The upper end wall 25 preferably has an 'opening therein which adapts the cabinet for direct protective relationship with an electric meter ,such as M. As shown the terminal chamber portion projects through the said opening in the end wall 25. The cabinet has an openable front cover 27, which is shownas being hinged at '27 to the bottom end wall 26. VSuitable means such as a spring latch 28 is provided for holding the cover in closed position and a seal 29 may be provided for preventing the. opening of the cover except by breaking the seal. The fused switch unit as a whole is secured to the rear wall 23 of the cabinet by means of screws 30, 30 engaging the supporting ` device 4, 4. If preferred a sheet of insulating material may be interposed between the device 4, 4 and the cabinet wall 23.

For operating the switch members there is provided a spindle 31 including two pivot sections 32 and 33iextending through bearing openings-in the side walls 24, 24 of the cabinet. The said spindle is bent to form a manually operable handle 34 outside of the ter connections C* and C extend from the meter M to wire connecting terminals 52, 52 mounted on the blocks 46, 46 adjacent the terminals 51, 51. The outgoing circuit wires L, L are connected directly with terminals 53, 53 which-terminals are connected res ectively with the terminals 52, 52 b means o movable testinglinks 54, 54. As i lustrated the links 54, 54 arel entirely removable, but this is not essential. .The testing links 54, 54 asshow-n are of awell known construction, each link being slotted near its ends and thus adapted' to receive studs 55 and 56 connected respecstud and witli tively with the corresponding terminals 52 and 53. Each link has an insulating handle 54. It will be seen that by removing the links 54, 54 the circuit may be broken betweenthe said terminals 52, 52 and 53, 53.

Preferably, in addition to the testing links 54, 54 I provide other similar links 57, 57 interposed between the terminals 51, 51 and the corresponding switch contact supporting elements 15, 15. As already stated each element 15 is provided with an extension 47. At the front of each block is a short conductor 58 connected with the corresponding extension 47 byY means ofstuds 59 and 60. The corresponding testinilr link 57 is connected with the a similar stud 61 connected with the termina-l 51. .Y

In addition to the removable links54, 54 and 57, 57 I also provide contacts adapted for. the attachment of by-passing connectionsA from the switch contact supporting element 15, 15 to the terminal 53, 53. For this purpose, I uti ize at each side the before-mentioned/stu 59 and a similar stud 62 connectedW-ith the said terminal 53.l Links 63, 63 may be provided as vshown in dot-anddash lines in Figs. 1 to 3 for connecting the said studs 59, 59 and 62, 62. It will be seen that when the links 63, 63 are in place, the circuit will extend directly through the switch and fuse to the load terminals 53, 53. Itis then possible to eitherpartly or entirely disconnect the meter and electrically free the terminals thereof by removing some or all of the links 54, 54 and 57, 57.

The general arrangement of switch and fuse parts with the testing elements at the sides of the fuses is notl herein broadly claimed/being set forth in my copending application for electric meter service appliance,

Serial No. 715,320, filed May 23rd, 1924. The

specificmeter testing devices herein shown and described do not of themselves constitute a part of the present invention, being set forth and claimed in my copending applica. tion for electric meter service appliance, Serial No. 170,784 filed February 25, 1927.

From the foregoing description it will be apparent that, in the illustrated embodiment of the invention the fuse base and the blocks for the testing elements are supported independently of each other, although the invenl:mman

tion is not so limited. 'VAS shown the said base and blocks are independently supported by means of separate supporting elements e'xtending forward from -the rear supporting device 4, 4. Preferabl the same supporting elements, or some of t ein, serve to support the stationary contacts of the switch device.

viding access to thel testing means.

The supporting elements 5, 5 and 6, 6 have been described as connected with the fuse I base 3. lThe base may be rigidly and permanently connected with these elements if so desired, but I prefer to detachably conneet it or at least movably connect it, so that it can be moved or removed from the normal position in order to permit free access to the switching device. The fuse base is shown as being so mounted that it can be completely detached from the supporting elements by merely unscrewing the screws 8, 8. Preferably in order that the contacts 1 and 2 may be `retained upon the fuse base when the base is detached, each of the screws 8 carries a washer 64 located in a recess 65 in the base. It will be obvious that as the screw 8 is withdrawn from the sup orting element -the washer 64 will move orward in the recess 65, but that the washer will engage the front surface of the recess to prevent complete withdrawal of the screw, thus holding the Award edge of the switching member to hold it and guide it for rectilinear movement; but when the fuse block is removed, the rectilinearly movable switching member isentirely exposed and is entirely freev to be removed in a. forward direction. In this connection it will be observed that the slot 37 is open toward the rear, thus permitting the aforesaid forward removal of the switching member.

In Fig.'7 I have shown a construction similar to that shown in Figs. 1 to 6 but differing in that the fuse block is so mounted that it may be readily removed by direct manual action and Without the use of tools. Instead of providing means such as the screws 8, 8 for providing both an electrical connection and a positive mechanical connection with is split as shown at 684 and it 'normally enters lll,

an engages the sides of an Unthreaded hole formed in the corresponding supporting element o". Thus the element 8a serves to les tablish an electrical connection between the fuse contact and the'corresponding supporting element carrying the corresponding stationary switch contact, but no positive mechanical connection is provided, the fuse block being free to be manually removed in a forward direction.

l may-provide interchangeable fuse blocks so that any one of several fuse blocks adapted for holding fuses ,of diderent electrical characteristics, may be connected with the other parts of the" appliance without any extensive changes in the' said parts. in Fi 7 l have shown a longer fuse base 3B, this ase carryv ing fuse contacts, such as l, constructed and spaced for receiving a fuse F longer than the iuse l? and having diderent electrical characteristics. Each of the fuse contacts is held in place on the base by means of a screw 69 and each of them is provided with an extension 70 having a hole therein through which entends the corresponding connecting screw, such at 8E. The fuse base 3@ is considerably longer than the fuse base 3 and accordingly a corresponding cabinet cover (not shown) is provided having an opening therein correspending in length to the length of the fuse base 3a..

lt will be observed that the separate mounting of the fuse base and of the supporting block for the meter testing elements makes it possible for the base to be removed or interchanged as decribed without in any way interfering with or affecting the said testing elements or the wiring connections. The positions of the testing elements are such that they do not in any way interfere with the inspectionr or adjustment of the switch parts upon removal of the base.

'What ll`claim is:

l. ln an electric meter service appliance, the combination of rear insulating supporting device, a plurality or" supporting elements structurally separate from the supporting device and projecting forward therefrom, a switch device located at the front-of the supporting device and comprising a pair of stationary switch contacts and a switching element movable to make and break electrical connection between the said contacts, an insulating base supported at least in part upon some of the said supporting elements in normally fixed spaced relationship with the rear insulating supporting device and in front of the switch device, a pair of fuse receiving contacts on the base, and meter testing facilities also supported at least in part upon some of the said separate supporting elements in ired spaced relationship with the rear insulatingsupporting device.

' 2. In an electric meter service appliance, the combination of a rear support, a. plurality of supporting elements structurally separate vfrom the support .and projecting forward therefrom, a switch device located at the front of the support and comprising a pair of stationary switch contacts and a switching ele` ment movable to make and break electrical connection between the said contacts, an insulating base supported at least in part upon v some of the said supporting elements in normally xed spaced relationship with the rear support and in front of the switch device, a pair of fuse contacts on the base, an insulating 'member separate from the base in fixed spaced relationship with the rear support and supported at least in part on supporting elements .other than those upon which the base is supported, and meter testing elements carried by the said sepa-rate insulating member.

3. ln an electric meter service appliance, the combination of rear insulating supporting device, a plurality of supporting elements structurally separate from the supporting device and progectin forward therefrom, a switch device locate atthe front of the/supporting device and comprising apair of stationary switch contacts and a switching element movable to make and break electrical connection between the said contacts, an insulating base supported at least in part upon some ol the said supporting elements in normally xed spaced relationship with the rear insulatin supporting device andfin front of the switc device, a pair of fuse contacts on the base, an insulatingmember separate from the base in fixed spaced relationship with the rear insulating supporting device and supported at least in part on supporting elements other than those upon which the base is supported, and meter testing elements carried by the said separate insulating member.

Ll. lin an electric meter service appliance, the combination of a rear support, a plurality of supporting elements structurally se arate from the support and projecting orward therefrom, a switch device located at the front of the support and comprising a pair of stationary switch contacts carried respectively by two of the said supporting elements and alsocomprising a switching element movable between the said contacts .to make and break electrical connection between them, an insulating base supported in partupon the said supporting elements in normally fixed spaced relationship with the rear support and in front of the switch device, a

,pair of fuse receiving contacts on the base,

and meter testing facilities also supported in them, an insulating base supported in part on one of the said supporting elements, in normally Xed spaced relationship with the said support, a pair of fuse receiving contacts on the base, an insulating member separate from the base and supported independently thereof in part onthe vother supporting element in fixed spaced relationship with the rear support, andniete'r testing elements carried by the said separate insulating member.

6. In an electric meter service appliance, the combination of a rear support, a pair of metallic supporting elements projecting forward from the support, a pair of opposed stationary switch contacts mounted upon and electrically connected with the respective supporting elements, a switching element movable between the said contacts to make.

and break electrical connection between them, an insulating base supported in part on one of the said supportingelementain normally fixed spaced relationship with the rear supl port, a pair of fuse receiving contacts on the base, a conducting element extending through the base and electrically connecting the last said supporting element with one fuse contact, an insulating member separate from the base and supported independently thereof in part on the other supporting element in normally lixed spaced relationship with the rear support, meter testing elements carried by theseparate said insulating member, and a conducting element extending through the insulatin member and electrically connecting the ot er supporting element with one of the testing elements.

7. In an electric meter service appliance, the combination ofa rear support, two pairs of metallic supporting elements projecting forward from the support, an insulating base supported in part on one supporting element of each of the said pairs, in normally fixed spaced relationship with the rear support, a pair of fuse receiving contacts on the base at the front thereof, and electrically connected respectively with one supporting element of each of the said pairs,two pairsof opposed stationary switch contacts mounted on and electrically connected with the respective supporting elements, a rectilinearly movable switching member engaging at its front edge with the said base to be guided in part thereby and comprising twp spaced conducting elements movable respectively between the contacts of the said pairs to make and break electrical connection between them, an insulating member separate from the base and supported independently thereof in part on the other supporting element Aof one of the said pairs, in fixed spaced relationship with the rear support and meter testing elements carried by the said insulating member with one of the said testing elements electrically connected with the last said supporting element.

8. In an electric meter service appliance, the combination of a rear insulatmg supporting device, two pairs of supporting ele- .ments structurally separate from the supportingdevice and projecting forward therefrom, an insulating base supported in part on one'supporting element of each of the said pairs, a pair of fuse receiving contacts on the base at the front thereof, two pairs of opposed stationary switch contacts mor nted respectively on the said supporting elel. ents, a rectilinearly movable switching member engaging at its front edge with the said base to be guided in part thereby and engaging at its rear edge with the supporting device to be guided in part thereby, the'said sw'tching member comprising two spaced con ucting elements movable 'respectively between the contacts of thesaid pairs to make and break electrical connection between them, anl insulating member separate from the base and supported independently thereof in part on the other supporting element of one of the said pairs, in fi ed spaced relationship with the saidlsupporing device, and meter testing elements'carried by thev said separate insulating member. v

' 9. In an electric meter service appliance, the combination of a rear support, two pairs of supporting elements structurally separate from the support, and projecting forward i therefrom, an insulating base supported in part on one supporting element of each of the said pairs in normally xed spaced rela tionship with the rear support, a pair of fuse receiving contacts on the base Vat the front thereof, two pairs of opposed stationary switch contacts mounted respectively on the said supporting elements, a rectilinearly movable switching member engaging at its front edge with the said base to be guided in part thereby and comprising two spaced conducting elements movable respectively between the contacts of the said pairs to make and break electrical connection between them, an insulating member separate from the base and supported independently. thereof in part on the other supporting element of one of the said pairs in fixed spaced relationship with the rear support, meter testing elements carried by the said separate insulating member, and an additional supporting element for the said separate insulating memi I' ber structurally separate from` therear suplill port and projecting forward therefrom.

. l0. ln an electric meter service appliance, the combination of a rear supp'ort, a switch device located at the front of the support and comprising two stationary contacts and a conmeter testing facilities in Xed spaced relations'hip with the support and for holding it against removal with the base.

il, ln'an electric meter service appliance, the combination of arear support, a switch device located at the front of the support and comprising two stationary contacts and a contact element movable to make and break electrical connection between them, an insulating base, a pair of fuse receiving contacts on the base, means for detachably and removably supporting the base upon the said support in normally fixed spaced relationship therewith and in front of at least a portion of the switch. device, the said supporting means permitting free access to the switch device from the front when the fuse base and the contacts carried thereby are removed., meter testing facilities, and means carried by the support independently of the said base for supporting the said meter testing facilities at one side of the base and in spaced relationship with the said support and for holding it against removal with the base.

. l2,v ln an electric meter service appliance, the combination of a rear support, a switch device located at the liront of the support and comprising two-stationary contacts and a contact element movable to make and break l ical connecton between them, a pluy ci interchangeable insulating bases a rality of pairs/ot fuse receiving-contacts on the respective bases, adaptedv for receiving fuses having li'erent electrical charac-v teristics, means for detach/ably and removably supporting any one of the bases upon 'the said support in normally fixed spaced relationship therewith and in. front ci at least a portion of the switch device, the ysaid supporting means permitting one base and the fuse contacts carried thereby'to be removed .and another put in place, meter testing facilities, and means carried by the support independently ofv any of thesaid bases for supporting the said meter testing facilities in fixed spaced relationship with the support and for holding it against removal withy the bases.

13. lin an electric ineterservice appliance, the combination of a rear support, two pairs of opposed stationary switch contacts -located at the front of the support, a movable Vswitching member comprising two conducting 'elements respectively movable between the said contacts of the corresponding pairs` to make andbreak electrical connectlon between them, aninsulating base, a pair of fuse receiving contacts on the base, means for detachably and removably supporting thebase upon the said support in normally iixed spaced relationship therewith and in front of at least a portion of theswitching member, the said supporting means permitting free access to the switch contacts and the switching member from the front when the fuse base and the contacts carried thereby are removed, meter testing facilities, and means carried by the support independently ol the said base for supportin the metertesting facilities in iixed spaced relationship with the support and for holding it against re\ moval with the base.v v

lll. In an electric meter service appliance, the combination ci a rear support, two pairs of metallic supporting elements projecting forward from the support, an insulating base, means for detachably and removably supporting the base upon one supporting element of each of the said pairs, in normally fixed spaced relationship with the rear support, a pair of 'fuse receivingcontacts on the base at the front thereof, and electrically connected respectively with the last said supporting elements, two pairs of opposed stationary switch contacts mounted on and electricall)` connected with the respective supporting elements, a rectilinearly movable switching member engaging at its front edge with the said base so as to be guided thereby and so as to be removable in the forward direction when the base is removed, the said switching member comprising two spaced conducting elements movable respectively between the lcontacts oi the said pairs to maire and breakelectrical connection between them, an insulating member separate Jrom the base and supported independently thereof in part on the other supporting element of one of 4the said pairs, in fixed spaced relationship with the rear support, and meter testing elements carried by the said separate insulating member with one ot'the testing elements electrically connected with the last said sup,- porting element. i I

l5. wrn an electric meter service appliance, the combination of a rear insulating supporting device comprising two separated parallel bars, supporting elements structurally separate from the respective bars, and projecting forward therefrom, an insulating base supported on supporting elements projecting from both bars, and thereby held in normally xed spaced relationship with the said bars, a pair of fuse receiving contacts on the base at the front thereof, a switch device located at least in part behind the base and comprising two stationary switch contacts carried by the supprting device and an element movable to make and break electrical connection between the said contacts, an insulating member separate from the base and supported independently thereof on supporting elements projecting from both bars, andy thereby held in fixed spaced relationship with the bars, and meter testing elements carried by the said separate insulating mem ber.

16. In an electric meter service appliance, the combination of a rear insulating supporting Adevice comprising two separated parallel bars, supporting elements structurally separate from the respective bars and projecting forward therefrom,an insulating base, means for detachably and removably supporting the base on supporting elements projecting from both bars, to thereby hold it in normally fixed spaced relationship with ,25' the said bars, a pair of fuse receiving contacts on Vthe base 'at the front thereof, a switch device located at least in part behind the base and comprising two stationary switch contacts carried by the supporting .de-

vice and an element movable to-make and break electrical connection between the said feontacts, an insulating member separate from the base and supported independently thereof on supporting elements projectingV 35 from both bars, and therefore held inlixed spaced relationship with the bars, and meter testing elements carried by the said `separate insulating member.

17. In an electric meter service appliance,

40 the combination of a rear insulating supporting device comprising two separated parallel bars, two pairs of metallic supporting elements projecting forward from the respective bars, an insulating base supported in part on one supporting element of each of the said pairs, and therebyheld in normally fixed spaced relationship with thesaid bars, a palr of fuse receiving contactsonthe base at the front thereof, and electrically connected respectively with the last said sup- "with 'the supporting element of one of the said pairs,

and thereby held in fixed spaced relationship said bars, and meter testin elements carried by the said separate insuiting member with one of the testing elements electrically connected with the last said supportin element.

18. n an electric meter service appliance, the combination of a rear insulating sup.- porting device comprising two separated parallel bgars, two pairs of supporting elements structurally separate from the re ctive bars and projecting forward therefrom, an insulating ase supported in part on one supportin element of each of the said pairs, and there y held in normally fixed s aced relationship with the said bars, a pair of) fuse receiving contacts on the base at the front thereof, two pairs of opposed stationary switch contacts mounted respectively on the said supporting elements, a rectilinearly movable switching member engagingat its front edge with the said base to be guided in part thereby and enga in at v,its near edge with the barsg o y t e supporting device to be guided in parttherebyfthe said switching memberfcmprising two spaced conductlng elements; movable frespectively between the contactsfefthensaid pairs to make and break eletricaljconnection between them, an insulating member separate from the base andi'stpported independently thereof in part on the other supporting ela;J ment of one of the said pairs, and thereb:Y held in fixed spaced relationship 111th the said bars, meter testing elements carried by the said separate insulating member, and an operating device for the switchin member located in part in thespace behmd the base and the insulating member andl between the supporting elements projecting `forward from the respective bars of the supporting device. e

In testimony whereof I have hereunto set my hand this 31st day of December, 1927.

JOSEPH SACHS.

lporting elements, two pairs of opposed stationary switch contacts mounted on and electrically connected with the respective supporting elements, a rectilinearly movable switching member engaging at its front edge with the said base to be guided in part there- .by and engaging atits rear edge with the bars of the supporting device to be guided in part thereby, the said switching member comprising two spaced conducting elements movable respectively between the contacts of the said pairs to make and break electrical connection between them, an insulating member separate from the base and supported independentlv thereof in part on `the other los I

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