US1020036A - Insulating-lining for electrical lamp-sockets. - Google Patents

Description

E. H. FREEMAN.

INSULATING LINING FOR ELECTRICAL LAMP socKBTs.

APPLICATION FILED JUNE 2l, 1911.

Patented Mar. 12, 1912.

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EDGAR E. FREEMAN, 0F TRENTON, NEW-JERSEY.

INSULATING-LINING FOR ELECTRICAL LAMP-SOCKETS.

Specification of Letters Ilatent.y

i Application filed June 21, 1911. serial No. 634,593.

and useful Improvements in Insulating- Linings for Electrical Lam Sockets, of which the following is a specification.

This invent-ion relates lto the subject of casings for electrical lamp sockets, and has particularly 1n v1ew an 1mproved means for fitting the cap of the socket casing with a permanent vinsulating lining that will effectually and satisfactorily fulfil all 0f the requirements `of the National Board of Fire Underwriters.

Heretofore various expedients have been v volved 'fastening projections or elements of various kinds formedI integrally or otherwise with the sheet metal cap, or with the shellpart of the casing. In some forms of lining fastenings the resiliency of the insulating lining has been depended upon to effect a lockingaction, while in other forms `of construction effort has been made to -permanently secure' a rigid lining in place by suitable fastening elements. v

In contradistinction to the known lining fastening means aboye referred to, the present invention contemplates the provision of what may be termed a molded insulating lining for a socket cap, that is to say, the ap lication tothe cap of any suitable'insw latmg material that is shaped to lining form while lin la plastic state either within or without the cap, v and then caused to become set or hardenedv about and upon suitable anchoring projections within or u on the metal cap or the 'parts thereof. guy

- suitable insulating material capable of bec; Though susceptible to a wide range of' ing handled in thls way 'may beutilized in carrying out the-invention 1n this manner.

structural modification, the essential features of the invention are' welll exemplified in the accompanying drawings, in which- Figure 1 is Van enlarged sectional view of- .the casingl cap of a lamp socket equipped with a molded insulating lining. Fig. 2 is an enlarged cross sectional view thereof on the line 2 2 of Fig. 1. '-Fig. 3 is an endened.

with a lining or washer 2 of insulating ma;

terial. This lining or washer when set to its final form, is of t-he dished type and of a size to Yregister snugly within the correspondinglyshaped cap. It is proposed to permanently lock thisnlinihg in place. This may be accomplished" in various ways but preferably by means of a plurality. of inwardly projecting integral anchor spurs 3 which are forcibly punched inwardly from the body material of the c ap, by exterior means such as the pointed punches 4. The action of these punches is to fracture the spurs 3 sg as to present ragged edges that become embedded in the molded material while in a plast-ic state. Additional secur-y ing means may be provided by a dovetailed anchorin rib or ribs 5 provided within the the cap, and which rib or ribs likewise becomeA embedded in the plastic material prior to its becoming set or har- As indicated, any suitableinsulatin material may be employed to form the lining, that is, any insulating materiak such as sulfur or rubber compositions that may be molded in plastic form .and afterward -allowed to become hardened in a final form. In this connection it may'be observed that the cap itself may be lutilizedas the mold for theplastic material to be painted, run, orpressed intoplace, or it is obvious that Patented Mar. 12, 1912.

the lining may be separately molded in its proper form, then softened by heat and pressed into the cap overl the anchors and allowedto become set or hardened, and thus becoming a permanent part of the socket cap.

I claim:

1. As an improvement in electrical lamp sockets, the combination of the socket casing having asheet metal cap provided with introverted 'anchor elements, andV a liningl sockets, the combination of the socket casof plastic insulating material permanently molded upon the inner surface of the cap'v molded upon the inner surface of the cap and over and about said'prongs. 1o and over said anchor elements. l -In testimony whereof I hereunto alii-X my 2. As an improvement in electrical lamp signature in the presence of two Witnesses.

EDGAR H. FREEMAN.'

ing having a sheet metal cap provided with Witnesses: intraverted fracturedprongs, and a lining EDNA C. SMITH, of plastic insulating material permanently JENNIE T; MCCANN.l

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