US816483A - Holder for electric incandescent lamps. - Google Patents

Description

,483. PATENTED MAR. 2'7, 1906.

P. LEONARD & O. H. JONES. HOLDER FOR ELECTRIC INGANDESCENT LAMPS.

' APPLIOATION FILED FEB.17. 1904.

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UNITED STATES PATENT OEFIOE.

PETER LEONARD AND CHARLES HAROLD JONES, OF GREAT CROSBY,

I NEAR LIVERPOOL, ENGLAND;

HOLDER FOR ELECTRIC INCANDESCEN-T LAMPS.I

Specification of Letters Patent.

Patented March 27, 1906.

Application filed February 17, 1904. Serial No. 193,953.

To all whom it may concern.-

Be it known that we, PETER LEONARD and CHARLES HAROLD JONES, subjects of the Kin of Great Britain, and residents of Great Cros y, near Liverpool, in the county of Lancaster, England, (whose post-office addresses are, respectively, 25 Cooks road and 3 Little Crosby road, Great Crosby aforesaid) have invented certain new and useful Improvements in Holders for Electric Incandescent Lamps, (for which application has been made in Great Britain, No. 14,721, dated July 2, 1903, also No. 4,703, dated February 28, 1903,) of which the following is a s eciication.

his invention is in relation to holders for electric incandescent lamps, more especially for outdoor illumination or in situations where the lamps are subjected to damp or the weather; and the object of the invention is mainly to facilitate the wiring of thelamps so that there will be no slack wire and to secure an absolute water-tight or weatherproof connection from the ends of the cable insulation to the glass oi` the lamp.

In the drawings, Figure 1 is a sectional elevation of the lamp-holder and lamp with part of the lamp-board; Fig. 2, a sectional elevation of the parts of the lamp-holder separated from each other Fig. 3, a detail sectional view of the plun er and terminal; and Fig. 4 a view, on a smal er scale, of the invention applied to a hangin lamp. Fig. 5 is an enlarged sectional detail view or1 one of the sprin -plungers Re erring iirst to Figs. 1, 2, and 3, the main portion of the holder consists of a shell a, of orcelain or other suitable material, made tubu ar, but provided with a diaphragm at or near mid-length, which separates it into two chambers c and d. The chamber c forms a socket into which the lam -cap e can be inserted, and its lugs f are he d by the bayonetslots g. These bayonet-slots are only on the inside of the shell a and do not allow of the lugs of the lamp to go through to the outside surface. Round the edge of this socket c we place a loose rubber ring or washer h, and i is a threaded ring, of porcelain or other suitable material, which is screwed onto the part a, so as to compress the rubber washer h between them and force it against the lamp-cap e all round, so as to produce a damp-proof joint. When it is desired to renew or remove the damp, all that is necessary is to unscrew the ring i. In the diaphragm b are holes j, through which the plungers 7c project, so that they and the shell are retained in their proper relative positions. The plug l carries the spring-plungers k and terminals n, the latter being slotted to receive the wires m, which are slipped into the slots and pinched tight by the screws rw without the necessity of cuttin the wires. The interior of the chamber d o the shell a is so shaped that its plug Zits within it and rests against a beveled set-ofi or coned seat o. A packing of rubber or the like, such as p, or washer of any suitable'kind on the plug makes a water-tight jointJ at that end. r is an earthenware tube to span vthe space between the plug l and the lamp-board s, or if 'an adaptingpiece t is used then it spans the space between the plug and said adapting-piece.

Sup osing that a sign-board is to be wired throug from the back, as shown in Fig.- 1, holes u are made in it opposite where each lamp is to be, and the wires are doubled or looped, as shown, and the bights passed through, the wires then passing on to the next in series, and so on. This obviates cutting the wires or of branch wires to each lamp, as the two main wires pass into and out again of the 'One of the tubes r above described is placed over each pair of bights, the ends whereof are first bared of insulation, as shown at o. An insulating compound-such, for example, as sealing-waxis filled in the tube r, leaving the bared ends of the bight projectin This may be repeated until all the board 1s wired. The plugs Z are then placed over the tops ofthe tubes 'r and the projecting ends of the bights of the wires inserted in the terminals n and pinched by means of the screws w. The shells a are placed over the whole and fastened down onto the board by 'screws inserted through the holes This makes a watertight joint at the base end, and when the lamps are placed in their sockets c and the rings i. screwed down a water-tight joint is made at the outer end, and the connection of the lamp-terminals with the leads that supply current to the lamp is complete. When the board is wired on its front surface, we provide adapting-pieces t with slots or grooves therein to accommodate the wires.

. It will be noticed that by this invention we chamber and are coupled to the terminals.l

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avoid branch wires and the numerous joints which have hitherto been usual, and we also avoid any slack wire whatever. The shell being entirely of white glazed china, there is .no metal-work exposed, and there is complete protection of cable ends, spring-plungers, terminals, and junction of lamp-cap with its glass, and there is no liability of electrical leakage o'r any one sustaining a shock,

y represents holes in the shell a to enable a vshade or reflector to be fastened on.

Although our invention is more especially useful for electric signs, it maybe used in other situations. For instance, it can be used as a hanging-lamp holder, as shown in Fig. 4'. In this case, a is the outer shell, as before i, the screwed ring, and 7i the tube at base of the plug Z. The cap z is first threaded onto the pair of bights, the ends whereof are first bared, as shown, and then the tube 1^ is placed on. An insulating compound, such as sealing-warms filled into the tube r. The plug is then placed over the top of tube 1 and the wires pinched in the terminals and the shell a placed over the whole and screwed or other- Wise fastened to the cap z. This makes a water-tight joint. i

Fig. 5 shows the referred construction of the spring-contact This view shows the contact slidable and hollow and backed by a spring 1d, which abutsat its opposite end against a hollow screw k2 in the plug. Spring-y contacts are not broadly new, and this construction is not herein claimed.

We declare that what we claim is- 1. A holder for an incandescent lamp, having a hollow shell with a coned seat in its interior, a plug in said shell, said plug being constructively independent of the lamp and provided with s ring-contacts, with means for securing the eading-in wires of the circuit, and with a packing which fits snugly in said coned seat and forming a water-tight joint, and means for preventing the displacement outwardly of the plug toward the attaching end of the shell.

v 2. An electric incandescent-lamp holder, having a shell, a plug which fits water-tight into said shell, the spring-plungers carried by said plug, the leading-in wires, the ring?n in the shell exterior to the plug and embracing said wires, and insulating material which fills said ring about the wires', said ring being disposedbetween the said plug and the attaching end of the shell.

3. In electric incandescent-lamp holders, the combination with an outer tubular shell of earthenware, 'of an earthenware plug inserted thereinto, springlungers and terminals carried by the p ug, the terminals being slotted to receive the leading-in wires and provided with screws to pinch them tight in the slots, a rubber ring for making a water-ti ht joint between the plug and the hollow s ell, and an earthenware tube placed round the leading-in wires for spanning the space between the lplug and the lamp board or base, said rin eing filled with sealingwaX or other insu ating compound.

4. The combination with a lamp board or base, of a hollow lamp holder secured to said base, leading-in wires having partiallynaked bights which project from said base or board into said holder, a ring of earthenware which fits into said holder about the bights of the wires, and a filling of insulating material in said ring and about the wires, aportion of the naked bights of the wires projecting through and beyond the fillin in said ring.

In witness whereof we ave hereunto signed our names, this 3d day of February, 1904, in the presence of two subscribing witnesses.

PETER LEONARD. CHARLES HAROLD JONES. Witnesses:

G. C. DYMOND, JOHN McLAcHLAN.

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