US1090527A - Cap and shell fastening for lamp-socket casings. - Google Patents

Description

E. H. FREEMAN. GAP AND SHELL PASTENING POB. LAMP SOCKET .CASINGS.

APPLICATION FILED APILII. 1912.

1,090,527. rPanama 11.11.17, 1914.

EDGAR H. FREEMAN, oF TRENTON, NEW aEEsEY.

CAP AND SHELL EAsrENINe Eon LAMPfsoc'ifEm cAsrNesfy Application filed April 11, 1912.V Serial No. 689,967.

Toall whom it may/ concerm Be it known that I, EDGAR H. FREEMAN,

. a4 citizen of theUnited States, residing at Trenton, in the county of Mercer and State of New Jersey, have invented certain new and useful Improvements in Cap and Shell Fastenings for Lamp-Socket Casings, of

which the following is a specification.

This invention relates to the subject of metallic casings for electrical lamp sockets, and more particularly to casings of the adjustable type wherein a plurality of locking positions are provided between the shell and cap parts of the casing so. as to enable the casing shell to not only be readily and se' cui-ely united to the cap after the latter has been fitted in place, but also to permit the shell to be so positioned when locked to the cap as to present the switch-key (of a key socket) in a readily accessible and convenient position for manipulation.

To this end the present invention contemplates apsimple and reliable fastening connection between the shell and capV parts of the lamp socket casing, which admits of practically a universal circular adjustment for the shellso ,that the same may be locked by the same locking means in any of a num-A ber of dierent positions, while at the same time preserving all of the desirable features of that type of lamp socket casing having what is termed in the trade a snap fastening."

A further object of the invention is to provide an improved fastening connection between the shell and the cap parts of a casing which dispenses with the necessity of a locking hole or its equivalent to secure the locked partsagainst rotation inieither direction, and against separation, thus greatly simplifying a fastening of this character while at the Sametime retaining the maximum strength of the casing.

lith these and other objects in view, the invention consists iu certain novel combinations and arrangements of the parts as will more fully appear as the description proceeds, the novel features thereof being pointed out in the appended claim.

For a full understanding of the invention, reference is to be had to the following description and accompanying drawings, in which Figure 1 is a perspective view of a lamp socket casing constructedv in accordance with the invention, the cap being shown as sepaforced intol the cap,

Aline 5-5 of Figfet.

Specification o f Letters Patent. B131", 17,1914." i

rated 'from andelevated above thei'body portion of the casing.v Fig. '2-is a -verticalfsecl tional viewthrough the lamp socket casing, the' body portion being shown asseparated from the brought into an therewith. Fig. 3-isf a siinilarview showing the position 'assumed bytheparts after the upper end of the body portion' has been before the body portion has been rotated to bring the lugs of thecap into the lateral arms of the bayonet slots ot the body portion. Fig. 4 is a. similar view showingthe position assumed by the parts after the body portion has been pushed into the c ap and rotated to produce an interloekcap and properly` positioned with respect thereto to be forced into the cap -an'dinterlockingA 'connection ing connection between the members, and i Fig. is atransverse-sectional view o-n the Corresponding and to in the followin description and indicated in all the views othe, drawings by: the same reference characters.` l

type of twopart casing. for'gelectrical lamp sockets, althoughfor illustrzitive purposes the invention is showninkthc ndrawings l'It like partsare referredl l A l V so The improved V fastening forming the sub-` i i,

embodi'e'd in a metallic lamp socket casing i comprising a metallic shell or body part l and a cap part: 2,5tl`1'e said'cap 'part 'being provided with a peripherallange 3 which telescopically' receives anend portion of the shell or body portion 1.

rIhre end of the shell l which is telescopically engaged by the flanged portion of cap 2 is formed with a series. of equidistant or regularly spaced bayonet positioning slots 4 which open through the end of tho shell. The end of the shell may also be formed with a suitable slot or opening 5 to receive the switch key, although this slot the may be omitted Where the key is not used.

The flanged portion of the cap 2 is -formed with aseries of equidistant lugs G which correspond in number and position to the bayonet positioning slots 4 of the shelll. Itwill thus be obvious that by inserting the end of the shell or body portion l into thecap 2 -in such a manner that the lugs 6 will enter the bayonet slots 4, and then rotating the shell or cap to bring the lugs into the lateral arms of the bayonet slots an interlocking 'connection will be produced which will hold the shell and ca`p together and prevent the l resilient locking tongue 7 into an inopersaid members from being separated by adirect pull.

The mouth` of one of the bayonet positioning slots 4 is normally closedby means of a resilient looking tongue 7, the free end of.

the said locking tongue being substantially flush with the edge oi the casing and being bent inwardly to provide a guide'lip 8 for engagement with the end of that one of the lugs 6 which enters the bayonet slot. XVhen the shell is forced into the cap 2, the end of one of the lugs 6 will ride downwardly upon the inwardly bent guide lip 8 and thereby force the resilient locking'tongue 7 inwardly,

the parts assuming the position shown in` Fig. 3. Upon rotating either the shell l or the cap 2 to bring the lugs 6 into the lateral arms of the bayonet slots, as indicated in Fig. 4, the resilient locking tongue 7 u ill spring back into position so as to fit against one side of the lug and coperate therewith to prevent backward rotation of the, Shell. The mouth of the bayonet slot is then effectively closed by the resilient lockingtongue, so that the shell. andca can not be accidentally detached from eac other.

The sresilient locking tongue 7 is shownas constituted by one end of a strip of spring` metal which is applied to the interior of the shell 1 and has the lower or inner end thereof connected to the shell in any suitable manner, such as by means of the rivet 9.- An intermediate portion of the spring strip is formed -with a plunger l0 -,which passes loosely through an opening in the side of the shell. When itis desired to disconnect the shell andcap, it is merely necessary to press inwardly upon the plunger 10 and throw the come! of this patent may be obtained for ve cents each, by addressing th Washington, D. C.

ative position, preparatory to manipulating the shell or cap to release the lugs 6 from the bayonet slots 4. v l

Attention may be directed to the fact that with the bayonet positioning slots 4 and the f lugs 6 arranged at uniform intervals, the

. casing may be interlocked with the cap with the key receiving slot 5 on any side thereof, the neness of the adjustment which is possible depending upon the number of bayonet slots and lugs which are employed. It will be obvious that any'desired number of the bayonet positioning slots may be utilized, although for ordinary purposes it has been found 'that four of these positioning slots.; 'answer all practical requirements.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is y A cap .and shell fastening for lamp socket casings comprising, in combination, a cap member provided with a plurality of equidistant lugs, a shell member provided with a plurality of equidistant bayonet slots corresponding in number and spacing to said lugs, and a resilient locking tongue permanently fitted to one 4of said members and having an exteriorly' exposed operating means, the said locking tongue being normally sprung into the mouth of one of the bayonet slots substantially flush with the edges thereof.

In testimony whereof-I hereunto affix my signature in the presence of two witnesses.

EDGAR H. FREEMAN.

Witnesses:

SARA M. RANDALL, ADA MARSH.

e Comminioner of Patents.

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