US1907580A - Disconnecting fuse mounting - Google Patents

Description

My 9, 1933. A RAMSEY 1,907,58@

DISCONNEGTING FUSE MOUNTING Filed May 31, 1929 5 Sheets-Sheet 2 idf ffy

/Zan Hams @y May 9, l933 A. Rimedi)l 1,907,580

DISGONNECTING FUSE MOUNTING Filed May 3l, 1929" 5 Sheets-Sheet 3 Patented May 9, y1933 UNITED sTATEs PATENT oFFicE .ALLAN RAMSEY, 0F EVANSTON, ILLINOIS, ASSIGNOB, BY MESNE .ASSIGNm T0 SCHWEITZEB CONRAD, INC., 0F CHICAGO, ILLINOIS, A CORPORATION 0F DELA- WARE DIscoNNEcTING rusa noUNmG Application led Kay 31,

This invention relates to fuse mountings and more particularly to disconnect fuse mountings and it is one of the objects of the present invention to provide a fuse mounting wherein the fuse may be readily removed from the mounting without endangering the operator in an way.

Disconnect switches suc as are here contemplated are used in series with an oil circuit breaker or other fast acting switch and are intended to be operated only after the circuit has been broken at the circult breaker. Such switches have a large current carrying capacity, but are not designed to be opened under load and if such a switch is opened before the circuit through it has been interru ted at the circuit breaker, the switch is like to be destroyed by the resulting are and the operator is liable to be seriously or fatali injured.

These switches are used on high volta e system and even though the circuit brea er leading to the switch may be open there may be an appreciable charglng current and an operator attempting to grasp the switch to o en it is liable to be injured. Also, even ii) the fuse has blown thus opening the circuit through the switch, one terminal of the switch may be alive and an operator coming into close proximity to that terminal is exposing himself to unnecessary danger. It is, one of the objects of this invention to provide a-disconnect switch of the fuse type wherein the fuse, once it has blown, may be removed and another fuse may be inserted without the necessity of the operator exposing himself to danger due to one or the other of the switch terminals being alive. In the embodiment of the invention herein described this is done by providing the fuse with sockets one of which is adapted to receive an operating pole by means of which pole the fuse with its mounting sockets ma be inserted into place or removed from p ace as desired.

It is another object of the present invention to provide a spring contact clip. The contact clip in the present instance is U- sha ed and is adapted to receive a terminal within the U portion of the clip. The inner 1929. Serial No. 887.231.

portion of the clip with which sliding contact is established consists of a copper strip whereas the outer portion consists of a strip of spring materia which may be of phosp hor-bronze or of any other suitable material. Between the inner and outer stri s, there 1s located a strip` of copperbraidled w1re for increasing the current carr capacity of .the clip. The outer phcsp orbronze strlp maintains a spring pressure upon the inner copper strip and thereby maintains a good contact between the copper strip and the terminal., with which it 1s in engagement.

It is still a further object oiA the present invention to provide a fuse switch wherein the contacting terminal clips are mounted in housings to protect the saine from weather. The contact clips being so spaced within the housing with respect to the opening thereof as .to avoid al1 possibility of the entry of moisture to the contacts.

The attainment of the above and further objects of the present invention will be apparent from the following specification taken in conjunction with the accompanying drawings forming a part thereof.

In the drawings:

Figure 1 is a side view'of my disconnect fuse mounting;

Figure 2 1s a perspective view of the lower fuse socket;

Figure 3 is a front view of the disconnect fuse mounting;

Figure 4 is a view similar to Figure 1 showing the contact housings in longitudinal section;

Figure 5 is a fragmentar sectional view taken along the line 5--5 o Figure 4;

Figure 6 is a fragmentary sectional view taken along the line 6-6 of Figure 4;

Figure 7 is a fragmentary sectional view taken along the line 7-7 of Figure 3; and

Figure 8 is a view of the spring contact mounted in the housing.

Reference may now be had more particularly to Figure 1 showing an assembled view of my improved disconnect fuse switch. The disconnecting fuse is so mounted and arranged as to take the place of a discony contacts 31 to nec't switch, hence the entire arrangement may be termed a -disconnecting fuse switch. The switch is mounted upon a base 1 of channel iron or of any other approved standard construction. Su )porting insulators 2 and 3 are each provided wit i an ,insulator pin indicated at 4 and 5, said pins being bolted or otherwise suitably secured to the channel base 1. The insulators 2 and 3 are of standard construction and are mounted upon the base 1 in a well k`nown manner and a further description thereof lis not believed to be necessary at this time. Insulator caps 6 and 7 are secured to the insulators 2 and 3 and provide means for mounting the various parts to the insulators. An upper contact housing 10 is secured to the insulator cap 6 in any well known mannerz the same bein accomplished in the embodiment herein illustrated by means of a set of bolts 11. The base portion of the housing 10 has lip 12 formed therein to which lip is secured a termminal lug 13 by means of bolts 14. Electrical connections to a power line 15 are made through the luv 13. The housing 10 is open at the top anda is provided with a cover 20 for closing the open top thereof, said cover being secured to the top of the housing by means of suitable bolts indicated at 21. The front portion of the upper contact housing is substantiall closed being provided witi an opening thr contact mounted within the housin all in the manner to be resently more illy set forth. The vertical) portion of the opening is indicated at 25 and the horizontal portion is indicated at 26-26. The slot 25 divides the front portion of the housing 10 into two sections indicated at 28 and 29 respectively, which sections extend only part way to the top of the housing. Two spring contacts 31 and 32 which are wit a spring 8, to be more fully described hereafter, have one end thereof secured to the inner side of the wall section 28 and two similar spring contacts 33 and 34 have one end thereof secured to the inner side of the wall Section 29. T he upper portion of the walls 28 and 29 are formed to extend in an inverted U-shape formation as indicated at 36 in Figure 4. One end of the sprin contact 33 is secured within the inverted ortion 36 being riveted or otherwise suita ly secured in place. The other ends of the spring 34 are suitably secured to of the housing 10 as ,indicated at 38 in i re 4. The spring contacts hang within t e housing in the form of a U- shaped loop for receiving the terminal of the fuse socket to be more fully described as the description proceeds.

Reference may be had at this point to Figthe to ough which a fuse socket ma be inserted for establishing engagement i ure 8 showing the construction of the spring contacts 31 to 34. The s ring contact shown in Figure 8 is of a t ree ply construction.

The inner lamination 40 is of copper and comprises a strip of copper about of an inch wide and extending the full length of the-spring contact. It is, of course, understood that the invention is not limited to the use of a strip of the above dimension indicated as any other size ma be used as desired. The strip used in t e construction herein shown is ap roximately 1/50 of an inch thickv altho here a ain any other preferred size mayuge used. e outer lamination is of s ring phosphor-bronze and is preferably o about the saine width as is the copper strip and may be about two times as thick. Between the copper stp 40 and the phosphor-bronze strip 41 there is provided a center section 42 of hexible braided copper cable. The strips 40, 41 and 42 are suitably secured toget ends v43 and 44 preferabl by sweating the parts together. It is to be noted that the phosphor-bronze strip 41 touches the braid 42 only at the oints 45 vand 46 in addition to the points wiiere the two are fastened toether, bein otherwise spaced from the hraid. At t e points 47, 48 and 49 the bronze stri and the braided wire may be about ,1, ci) an inch apart. Connection to (the spring contact shown in Fi ure 8 is made by means of a tubular section which is inserted into the U-shaped portion of the contact.

The phos hor-broiize spring 41 maintains the copper ar 40 in pressure contact with the terminal inserted into the spring contact. The flexible copper braid 42 is also held in pressure contact with the inner copper lainination 40 by the phosphor-bronze spring thereby giving the necessary added current o carr ing capacity to the spring contact asof al construction such as shown inv Figurer sem ly. Holes 51-51 are drilled in the contact assembly after the ends of the laniinations have been sweated together. These holes constitute the means for securing the spring contact within the contact housing. Be ore proceeding with a further description'of the switch housing it may be well to describe the fuse sockets by means of which the connections are established between the fuse terminals and the contacts within the switch housings. The fuse 60 shown in the drawings is a standard Schweitzer & Conrad fuse of the type shown in the patent to Nicholas J. Conrad No. 1,689,424 of October 30, 1928 although any other standard form of high voltage fuse may be used. The fuse comprises a fusible current carrying element carried within a glass tube 61 and submerged in a bath of insulating li uid such as carbon tetrachloride or the l' e carried within the tube.

er at the The insulati liquid is held` within the glass tube 61. heends of the glass tube are sealed by---m'etal ferrules to which the opposite ends of the fusible conductin member within the tube are connecte The ferrules act as terminals for the fuse and a circuit through the-fuse is extended through the ferrules. The socket that is connectible tothe lower fuse ferrule is shown more particularly in Fi ure 2, said socket serving not only to esta lish connections to the fuse but also serving as a means for mounting the fuse in place. The upper end of the fuse socket 65 is provided with a circular split clamp 66 for receiving the lower fuse terrule. The portion `67 of the clump .is integral with the fuse socket and the portion 68 is separable therefrom, the two portions of the clamp being adapted to receive the lower fuse ferrule between them and thereafter to be bolted together by" n1eans of thumbscrews 69 passing through the holes 70 and 71 in the split clamp portion. The clam is provided with a downwardly extendlng arcuate shaped arm 72, the lower end of which is provided with a, cylindrical hole 73.

A cop r tube 74 is driven through the hole 73 1n the arm 72 and is held in posi- .tion by means of'a dowel pin 75 which is forced through a hole that is drilled through the lower end of the socket 72 and through the tube 74 after the tube has been forced into the hole 73 in the socket. The tube 74 constitutes a contact rod for establishing a circuit through the fuse by way of the fuse socket 65. The arcuate arm 72 is provided with a portion 78 shaped to receive a hinged socket member to be presently described. For this purpose a hole 79 is drilled in the fuse socket for receiving a stud upon which the Vhinge socket member is pivoted. The surface 78 is curved to permit the swinging of the socket member about the stud passed through the hole 79. The socket member 80 has two ears formed therein one of which is shown at 81. The ears are adapted to embrace the opposite sides of the socket member at the portion 78 and are provided with holesjthrough which the stud 82 maybe passed, said stud likewise passing through the hole 79. The stud is threaded at its ends and islleld in plaie by a set of nuts one of which isindicated at 83.

A pair of projections 85 extending from the arms 81-81 limit the angular movement of the hinge socket 80 by abutting against the socket melnber. The lower end of the hinge socket is bored out at 86 to receive t-he end of an operating rod of insulating material. The hole 86 is tapped and the pole 87 has a threaded prong ut itsl end for insertion into the hole 8G. lVhen ih'N prong at the end ofthe pole 87 is threaded into the tapped hole 86 a firm engagement tween the section 88 and the rest o the with the casting is had and by manipulation of the pole the hinge socket 65 may be inserted or removed from the housing 'carried b the insulator pin 7. The pronr that threa s into the hole 86 is integral wil the member 88 at the end of the pole 87, a short flexible section 89 being inter osed beole structure, said liexible section having a imited angular travel to prevent undue Vstrain being placed on the fuse and on the socket member by a side movementy of the ole.

The upper fuse socket is substantlally similar to the lower fuse socket differing therefrom onl7 in certain particulars to be presently set orth. Like the lower socket, the upper socket includes a s lit clamp portion for receiving and hol ing the upper fuse ferrule, and an arm 96 in the end of which a contact rod 97 in the form of a copper tube has been inserted.

The upper ferrule of the fuse is inserted between the s lit clamp portions 98 and 99 of the upper use socket and the portion 99 is then clamped to the portion 98 by means of a set of clamping screws in the form of thumb screws 100. The fuse is thus su ported from the upper socket, the lower soclet being suspended from the fuse, when the .fuse is in service. The clamp portion 99 1s provided with ay pair of projecting arms 101 and the clamp portion 98l is provided with a similar pair of projecting arms 102. These projecting arms serve as a means whereby the upper socket is sup rted and with it the fuse and the lower soc et carried thereby. The arm 96 of the up ersocket which corresponds to the arm 2 of the lower socket is not provided with a hin e socket such as 80-nor of course with te protruding portion 78 nor the hole 79 provided for the hinge socket.

The fuse socket 95 is supported from the upper switch housing by means of a pair of pivoted socket supports 105 and 106. The arms are pivoted to the housing at 107 and 108 respectively. The arms 1 01 and 102 of the fuse socket rest upon and are supported by the supports 105 and 106 at the ends thereof. The opposite ends of the supporting arms 105 and 106, indicated at 110 and 111 respectively, are held against upward lmovement due to the downward pull at the opposite ends of the supports by the wei ht of the fuse, by an equalizer arm 115 1gure 5) pivoted to the switch housing at 116.

The ends 110 and 111 of the supporting arms bear against the pivoted equalizer bar which thereby equalizes the weight carried by the two supporting arms. The ends of the supports 105 and 106 that su port the sockets are outwardly flared as indicated at 113 and 114 to guide the split clamp of the upper fuse socket into position if 1t is not otherwise accurately aligned during the operation of inserting the fuse into lace. The upper contact housing is provi ed with a pair of outwardly flaring guiding lips inicated at 118 and 119 respectively. The guiding lips serve as a guide for the tubular contact rod carried by the fuse sockets.

A switch housin 130 substantially similar tg the switch ousing 10 is secured to the insulator cap 7 in substantially the same manner as is the housing 10. This housing is provided with a cover 131 substantially similar to the cover 20 for the up r housing and a line terminal clip 133 similar to the line terminal clip 13 and the upper housing.

An explanation will now be given of the manner in which the fuse is inserted into plllgece in the switching structure. The upper socket is clam ed to the upper ferrule of the fuse and t e lower fuse socket is clamped to the lower ferrule of the fuse.

A stud at the end 88 of the insulated o eratin rod 87 is then threaded into t e tappe hole 86 in the hinge member 80 which is pivoted to the lower fuse socket. The assembl comprisingl the fuse, the upper fuse soc et and the ower fuse is then elevated until the contact rods 74 and 97 carriedf by thi lower fuselsocket and the upper use soc et respective come o osite the housings 130 an 10 resmctivelyl.)p The guiding lips 118 and 119 upon the upper use housing and the corresponding li s on the lower fuse housin serve to guide t e contact rods centrally o the housing. The assembly is elevated until the contact rod 97 comes opposite the opening 26 above the walls 28 an 29 in the upper housing. At this time the contact rod 74 is similarly located in the lower housing. The fuse assembly is then pushed inward so that the contact rods enter the housing, the portions 96 and 72 of the two sockets passing through slots such as the slot 25 shown in the upper housing. The inward movement of the fuse sockets into the housing is limited b sto 140 and 141 in the upper housing an in t e lower housing respectively. When the fuse sockets vabut against the stops 140 and 141 limiting their inward movement, the fuse may then be lowered until the arms 101 and 102 on the u per fuse socket rest u on the ends of the pivoted supports 105 an 106.

At this time the fuse is in the position shown in the drawings and the operating rod 87 ma now be unscrewed from the socket 80. It is to be noted that the spring contacts shown in Figure 8 do not carry any of the wei ht of the fuse or its associated sockets, t e same being supported by the arms 105 and 106. The spring contacts bear against the copper contact strips carried by the sockets and thus establish an electric circuit through the fuse. t

To remove the fuse from its mounting the operating rod is first turned into the hinge socket and by means ofthis rod the lower'fuse socket and with it the fuse and the upper fuse sockets are first raised to bring the contact rods 97 and 74 opposite the openings 26 and then the fuse and its mountin are drawn outward from the fuse contact ouBings.

In compliance with the uirements of the patent statutes I have herein shown and described a preferred embodiment of my invention. It is, however, to be understood that the invention is not limited to the precise construction shown, the same being merely illustrative.

What I consider new and desire to secure by Letters Patent is.

1. A fuse mounting comprising a pair of spaced insulators one above the other for receiving a fuse between them, a contact housing mounted on each of said insulators, and spring contact clips in each of said housings, each of the housings being closed at the top and having an opening in the side thereof through which a portion of a fuse engaging socket ma be inserted for engagement with the sprin contact within, the spring contact clips in below the side openings, and said. top of t e upper housing extending forward of said side opening to constitute an overhanging eave.

2. A fuse mounting comprising a pair of spaced insulators one above the other for receiving a fuse between them, a contact housing mounted on each of said insulators, and spring contact clips in each of said housings, each of the housings having an opening therein through which a portion of a fuse engaging socket may be inserted for engagement with the spring contact within, the up er housing including means spaced from t e contact clips for supporting the fuse engaging socket and thereby supporting the fuse held therein.

3. A fuse mounting comprising a pair of spaced insulators one above the other for receiving a fuse between them, a contact housing mounted on each of said insulators, and spring contact clips in each of said housings, each of the housings having an opening therein through which a portion of a fuse engaging socket may be inserted for engagment with the spring contact therein, t c upper housing including a pair of arms from which the fuse engaging socket may bc suspended thereby supporting the fuse.

4. A fuse mounting comprising a pair of spaced insulators one above the other for receiving a fuse between them, a contact housing mounted on each of said insulators,

spring contact clips in each of said housings,

each of the housings having an opening therein through which a portion of a fuse engaging socket may be inserted for enga rement with the spring contact within, lie

l upper housin including a pair of pivoted 2 on the ferrules of the fuse, said sockets having contacting portions for engagement with 1- the contacts and means carne by one ofthe sockets or receivin the end of an insulated o erating rod or insertin or removing t e fuse with its aociate sockets into and out of said contacts.

6. A fuse disconnect switch comprising a air of supporting insulators, a contact ousin mounted on each insulator, a pair of societe secured to the respective ends of a :fuse2 said housings having openings for receiving a portion`of said sockets for establishing a circuit through the fuse, and one of said sockets having means for inserting an insulating rod therein for inserting the fuse sockets with the fuse therebetween into the sockets and for removing the same therefrom.

7. A fuse disconnect switch comprising, a pair of supporting insulators, one above the other, a contact housin mounted on each insulator, a pair of s ets secured to the respective ends of a fuse, said housings having openings for receiving a ortion of said sockets for establishing a clrcuit through the fuse, one of said sockets having means for inserting an insulating rod therein for inserting the fuse sockets with the fuse therebetween into the sockets and for removing the same therefrom and means carried by the upper housing for carrying Vthe fuse and the associated Sockets.

8. A fuse disconnect switch comprising a pair of contacting terminals, a fuse comprlsing the blade of the switch, and fuse engaging sockets at the ends of the fuse for holding the fuse and maintaining a circuit therethrough, both of said sockets including portions inserted into and removed from the terminals by successive rectilinear motions at substantially right angles to one another and one of said sockets including a portion adapted to receive a mounting tool or mountin the blade.

9. Means or mounting a fuse in a substantially vertical osition, said means comprising a pair of orizontally spaced supports adapted to receive a fuse between them and su port the same, said supports being pivote about horizontal axes, and an equal- 1zer arm between them, said arm being pivoted intermediate its ends, and being acted upon by the two members so as to equalize the load on the two members.

10. A contact stri comprising a number of thin la'minations ying substantially parallel and adjacent one another, the inner lamina bein of copper and comprising the contact ma 'ng portion of the strip the outer lamina being of spring material for maintaining a spring pressure against the inner lamina, and the mtermediate portion being of flexible braided metal of high current conductivity.

1 1. A U-shaped contact clip comprising an inner relatively thin U-shaped contacting s'trlp having a backing of iiexible copper braid, and an outer U-shaped spring strip for .maintaining a spring pressurel against the lnner strip.

12. A contact clip comprising an inner relatively thin 'U-.snaped contacting strip having a backing of iexible current carr ing material and an outer strip of substantially the same shape as the inner strip for maintinlng a spring pressure against the inner s rlp.

13. A contact clip comprising an inner relatively thin contacting strip having a backing of flexible current carrying material and an outer strip of substantially the same shape as thejnner strip for maintaining a sprlng pressure against the inner strip, and between the two a flexible braided conductor of high current carrying capacity, said inner and outer strips being secured together at a plurality of spaced points.

14. A contact clip comprising an inner relatively thin U-shaped contacting strip havlng a backing ofilexible current carrying material and an outer strip of substantially the same shape as the inner strip for maintaining a spring pressure against the inner strip, said inner and outer strips being secured together adjacent their ends with-the flexible current carrying material between them.

' 15. A contact clip comprising an inner relatively thin contact making strip having a backing of flexible current carrying material and an outer strip of substantially the same shape as the inner strip for maintaining a spring pressure against the inner strip when the inner strip is forced outward, said inner and outer strips being secured together at a plurality ofA spaced points, and being separate from one another between'the securlng points.

16. A contact clip comprising an inner relatively thin contact' making strip having a backing of flexible current carrying material and an outer strip of substantially the same shape as the inner strip for maintaining a spring pressure against the inner strip when the inner strip is forced outward, said Yinner and outer strips being secured together adjacent their ends, and being separate from one another between the securing points.

17. A contact clip comprsin inner and outer stri s of substantially sim' ar U-shapes separate by a la er of flexible material of high current con uctivity.

18. A contact clip comprising inner and outer stri of substantia ly similar shape separated Ty a layer of flexible materialof high current conductivity, one of said str ips comprising a thin layer of contact making metal and constituting the contact making portion of the clip, the other strip compris ing a spring for maintaining spring pressure ainst said contact stri 19. switch including a pair of vertically spaced housing both the upper and lower housing be' osed at the top, contacts mounted in esiti of the housings, a switch member entirely removable from the switch and including contact making portions adapted to cooperate with the contacts in the housin to establish a circuit between them, said ousings being o en at one side for permitting entrance of t e contact making portions, said switch member including a pivotally mounted tool receiving member for receiving a tool for insertin and removing the switch member from t e switch.

switch including a air of vertically aced housings, both t e upper and lower ousing being closed at the to contacts mounted in each of the housings, a switch member entirely removable from the switch and including contact making portions adapted to cooperate with the contacts in the housings to establish a circuit between them, said housings being o en at one side for permitting entrance of t e contact making portions, said switch member including pivotally mounted tool receiving means spaced forward of the housings for receiving a tool for inserting and removing the switch member from the switch.

21. A switch including a air of vertically spaced housings, both t e upper and lower housin being closed at the top, contacts mounte in each of the housings, a switch member entirely removable from the switch and including contact making portions adapted to cooperate with the contacts in the housings to establish a circuit between them, said housing being o n at one side for permitting entrance of t e contact making portions, said switch member includin tool receiving means spaced forwardly o the housings and adjacent the lower housing for receiving a tool for inserting and removing the switch member from the switch.I

22. A switch including a pair of spaced contacts, a switch member including contact in g portions comprising trunnion-like members extending laterally thereof at the opposite ends thereof for establishing a circuit between the contacts, said switch member being moved into engagement with both contacts by a non-swinging motion as a unit in substantially a straight line, said switching member including tool receivin means whereby the same may be supporte for rea switch member including contact making portions at each end thereof and means at the lower end of the switch member and extending forwardly and downwardly thereof at a'substantial angle to the longitudinal axis of the switch member for receiving a tool for mountin the switch member in engagement with goth contacts.

24. In combination, a switch support having'two vertically spaced contacts, a combined fuse and switch connecting element having removable connection with the contacts, and tool receiving means extendin forward and downwardly from one end o the combined fuse and switch connecting element and constituting a art of said element for receiving a tool ibrmoving said clement laterally of itself towards engagement with both contacts.

25. A fuse switch includin a pair of contacts and a removable mem er ada ted to be placed in brid ing relation to t e contacts, said removale member comprising a fuse having ferrules at the ends thereof, and a socket removably secured to the lower ferrule and including contact making means for cooperating with the lower contact member, and a second socket removably secured to the upper ferrule and including contact making means for co-operating with the other contact.

26. A fuse switch includin a pair of contacts and a removable member adapted to be placed in brid 'ng relation to the contacts, said remova le member comprising a fuse having ferrules at the ends thereof, and a socket removably secured to the lower ferrule and including contact making means for coo rating with the lower contact member, said socket member includin a screw threaded tool receiving ortion or receiving a tool for mounting the removable mem- 27. A contact housing having a slot for prmitting access of a contact makin memr into the housing, said housing aving a second slot at an angle to the first slot for movement of a contact holding member therein to move the contact making member within the housing and away from the first slot, and a contact mounted in the housing for engagement with the contact making member when said contact making member is moved within the housing awa from the first slot by the movement of t e'holding member in the second slot.

28. A contact housing having a slot for permitting access of a contact making member into the housing, said housing having a second slot at an angle to the irst slot for movement of a contact. holding member therein to move the contact making member within the housing andaway from the lirst slot, and a contact mounted in the housing for engagement with the contact making member when said Contact making member is moved within the housing away from the first slot by the movement of the holding member in the second slot, said two slots being at substantially right angle to one another.

29. A switch housing having a T-shaped opening in the side thereof for receiving a contact making member, and contacts within the housing on the opposite sides of the stem of the T opening and having contact receivingA portions spaced from the web of the T shaped opening.

30. A switch housing having a T-shaped opening in the side thereof for receiving a contact makingvmember, and contacts within the housing on the opposite sides of the stem i of the T opening and having contact receiving portions spaced from the web of ;the T shaped opening, and a contact making member movable into and out of the housing through the web of the T opening and including a portion thereafter movable in the stem of the T opening for moving'the contact making member into engagement with the contact receiving portions.

31. A switch housing having a T-shaped opening inthe sidethereof for receiving a contact making member, and contacts within the housing on the opposite sides of the stem of the T opening and having contact receiving portions spaced from the web of the T shaped o emng, and means overhanging a portion oY the web of the T shaped open- A ing for guiding a contact making member into the housing. A

32. A switch housing having a T-shaped opening in the side thereof for receivin a contact making member, and contacts wit in the housing on the opposite sides ofthe stem of the T opening and having contact receiving portions spaced from the web of the T shaped opening, a contact making member movable into and out of the housing through the web of the T opening and including a portion thereafter movable in the stem of the T openin for moving the contact making member into engagement with the contact receiving portions, and means overhanging a portion of the web of the T shaped opening for u-iding a contact making mem` ber into the ousing.

In witness whereof, I hereunto subscribe my name this 29th day of May 192,9. Y

1 ALLAN RAMSEYo

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