US1774014A - Cap and shell fastening - Google Patents

Description

Aug. 26, 1930. H. HUBBELL, JR

CAP AND SHELL FASTENING Filed March 15 1928 Patented Aug. 26, 1930;

PATENT QFFICB HARVEY HUBBELL, m, or. BBIiJGEroRr, oo'nnncrrcua'.

on? Am an FASTENING Application filed March 15, 1928. Serial No. 261,819. a i

This invention relates to the enclosing shell for lamp s'ocketsandthelike, particularly to the means for connecting the cap and body sections of the shell together, andhas for an object to provide an improved cap and shell construction which willgive a smooth plain exterior to the cap. and in which the body and skirt portions of the-cap may be made in one piece. i Y It is also an object of the invention to provide aconstruction which will positively lock the cap and body sections of the shell together with a connection which will carry considerable weight, but which may be easily unlocked .15 topermit separation of'the cap and .body.

WVith the foregoing and other objects in view, I have devised the construction illustrated in the accompanying drawing forming ing, r I

Fig. 1 is a. side elevation of. a lamp: socket with portions of the'cap and body section broken away to show the connection between the cap and body in section, the section being substantially on line 11ofFig. 2.

Fig.2 is a transversesection substantiallyon line 2-2 of Fig. 1 and showing the insulating body for mounting the switch and lamp contacts in elevation. I 1

V Fig. 3 is a partial side elevation and partial section of the cap indicating the notches formed in the edge of the skirt.

Fig. 4 is a perspective view of the lower part of the cap showing the free edgeportions between the notches folded toward the inner side of the cap.

Fig. 5 is aperspective View of the upper end of the body of'the shell, and v Fig. 6 is a detailed section through the securing means on the plane of Fig. 1, and on an enlarged scale. I

The shell illustrated is shown as enclosing theelements of alamp socket having a switch operated by'a pull chain. The detailed construction ofthis switch is not shown as it forms no part of my present invention. The shell comprises a cap section 10 and a-body section 11 made of sheet metal in the usual manner, and enclosed by the body section is theblock 12 of insulating material in which ated switch is used. r

are mounted the switch elements, not shown, and which also carries the screw shell and. central lamp contacts not shown. .Itwill, of course, be understoodthat while I have shown this. shell, connectionasapplied to a lamp socket, it is by nomeans limited to use therewith, as it may be used for enclosing shells of depending'switch'es and like devices. This insulating block carries the usual bind- 1ng post screws 13'for connecting lead wires 14 in the usual maner. The upper portion of the cap islined with a suitable fibre orother insulating lining 15, and the body of the shell is lined with a similar lining 16en-- closing the works of the socket. The body portion or the shell also has the usual-notch 17 extending longitudinally fromfthe "free end thereof for passage of the guide v18 for a part'of this SPGClfiCltlOln- In this draw-.

the pull chain .19 foroperating-the switch, or the key for operating the switch if a key oper .The cap is provided with a substantially cylindrical skirt portion 20, and it isof somewhat larger diameter than the body of the cap I to provide a shoulder 21 on the inside of'the cap spaced a'esuitable distance from the free endiof the skirt. This free edge is provided with notches 22-at' suitably regular spaced dis; tancesthro-ughout its periphery and o'fsuite able depth. These notches arepreferably substantially square or rectangular as shown. After this free edge of the skirt is notchedthe walls of the skirt between the notches, and indicated at 23, are foldedover toward the body of the c'ap,,asindicated clearly in Fig.

. 4, and preferably toward theinner wall of the cap so that they will be out of sight in the finished shell. It will be apparent that in this POSltlOIl'thG free edges 2st form shoulders adjacent the inner wall of the cap and spaced in- 9G wardly from the free edge of the cap, and the portions 23 carrying theseshoulders are separated hy the notches 22. i

It will'also be, apparent that the notches have-become openchannels 22 when portions 5 I 1. Adjacent thefree end of this section it is wardly. This'will give a shoulder 27 on the lower end of thelug which extends outwardly from the face of the body. The'lugs of each pair are spaced from each other substantially the distance between the centers of two of the portions 23. Also between the lugs of one orboth pairs is provided another outwardly extending lug or nib 28. A convenient way to form this member is to provide two spaced slits extending longitudinally of the body section and forcing outwardly the walls between the slits which provide shoulders 29 on the opposite sides of the lugs 28, and these lugs are made of awidth so that they may pass into the notches 22 between the folded portions 23 of the cap. These lugs may be of shapes other than that shown. For example, they may be similar to lugs 25 with their shoulders extending longitudinally of the shell. y

In assembling the cap and body portions the free end of the body section is inserted in the skirt of the cap with the lugs 28 in any suitable open channels 22. The portion 30 of the body section will yield inwardly suficient to cause the lugs 25 to pass over the portions 23, and then will spring outwardly to cause the shoulders 27 on these lugsto engage the 1 free edges of the portions 23, as shown in Fig; 1, and will securely lock the cap and body sections together. The lugs 28 will preferably be seated in diametrically opposite channels 22 and the side shoulders will engage the sides of these channels to prevent relative turning J; movements of the cap and body sections in either direction, and so will prevent movement of the lugs or nibs 25 into alignment with the channels to permit the separation of the cap and shell. The shoulder 21 in the cap is so located as to lie adjacent the free end of the body section, as indicated in Fig. 1, to

prevent thissection rocking laterally in the cap and to limit movement of the body section intothe cap. If it is desired to separate F the cap and body section all that is necessary is to press inwardly the yieldable portion 30 which will remove the lugs 25'carrie-d thereby from engagement with the free edges 2%. Then the body or cap may be rocked laterally to withdraw these lugs from the cap and the cap and body may be easily separated.

It will be apparent that the skirt portion of the cap is in one piece with the body portion thereof, and that a single thickness only is required, doing away with the extra enclosing ring which is now commonly employed in this type of devices. This structure also gives a smooth plain outer surface to the cap, giving the required neat and attractive appearance. It will further be noted that if undue strain is placed on the cap and body sections tendingto separate them, the pull of the lugs 25 on the free edges of the folded portions 23 will tend to draw these portions inwardly toward the lugs 25 and the body portion, so that instead of tending to draw away from these supporting edges 23 this strain tends to draw these supporting edges toward the base of the lugs 25 and increase the holding effect. This, therefore, gives a very strong connection between the cap and body sections which will safely sustain the considerable weight involved in the shades and'domes used.

Having thus described the nature of my invention, what I claim is:

1. A shell comprising a body section and a cap section adapted for telescoping engagement, one of said sections having its free edge provided with notches and folded upon itself to provide shoulders and channels open at both ends, the other section being provided with laterally projecting lugs to engage said shoulders to secure the sections together, and

means to enter one of said open channels to prevent relative turning movement of said sectlons 1n either direction.

2. A socket shell comprlsing telescoping cap and body sections, one of said sections having its free edge portion notched and folded on itself to provide a shoulder by the free edge and a channel open at both ends, and the other section being provided with a lug to enter said open channel and with other lugs to engage said free edge to secure the sections against turning movements and against longitudinal separation.

3. A shellcomprising telescoping cap and body sections, said cap being provided with a series of notches in its free edge and the portion between said notches being folded inwardly toward the wall of the cap to provide channels open at both ends, the body being provided with laterally extending lugs to engage the free edges of said folded portions to prevent separation of the cap and body, and said body also having laterally extending lugs to enter in certain of the channels and engage the side edges thereof to prevent relative turning movements between the cap and body.-

1. A shell comprising telescoping cap and body sections, said cap having its free edge portion notched and folded inwardly on the body portion thereof to provide channels open at both ends, said cap being also provided with a shoulder spaced inwardly from the free edge of said folded portion, said body section being provided with laterally extending lugs arranged to engage said free edge to secure the sections together and with another lug to enter one of said channels to prevent turning movements of said sections in either direction, and the free edge of the body section being adapted to engage said shoulder in the cap to limit relative longitudinal movements of said sections.

5. A shell comprising telescoping cap and body sections, said cap section being provided v with a series of notches in its free edge and the portions between said notches being fold.- ed inwardly on the body of the cap to provide channels open at both ends, said cap being also provided With a shoulder spaced inwardly from the free edges of said folded portions said body section having laterally extending lugs to engage the said free edges to v secure the sections together and other lugs to enter the channels vto secure the sections against'relative turning movements, and the free edge of said body section being adapted to engage said shoulder to limlt relative longitudinal movement ofsaid sections.-

6. An enclosing shell for lamp sockets and similar devices comprising acap having a series of spaced notches about its free edge and the portions between these notches folded over toward the inner wall of the cap to provide open channels open at both ends, and a body section adapted to have one end thereof inserted into said cap and carrying means to enter said channels and to engage the free edges of said folded portions to secure the cap and body together.

7; A shell for electrical devices comprising a cap section having a series of spaced notches about its periphery and the portions between said notches folded inwardly toward the inner side of the cap to provide channels open at both ends, a body section having one end adapted to be inserted into the cap, said body section being provided with a notch leading from the end thereof'providing a yieldable portion at one side thereof, said yieldable'portion having a lug to engage a free edge of said folded portions and the body section being also provided with another lug to engage a free edge of the folded portions on the opposite side of the cap, and

' an additional lug on the body section adapted to enter one of said open channelsand engage the sides thereof to prevent relative turning movements between the cap and body sections. I

In testimony whereof I aflix my signature. 7

HARVEY HUBBELL, J R.

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