US1806207A - Splicing and terminal device for fire detecting cables - Google Patents

Description

May 19, 1931. w. D. LlNDsEY SPLIGING AND TERMINAL DEVICE FOR FIRE DETECTING CABLES Filed June ll, 1927 BY ATTORNEY Patented May 19, 1931 UNITED STATES;

PATENT oFFicE WILLIAM DALES LINDSEY, F SOUTH ORANGE, JERSEY, ASSIGNORTO GARRISON FIRE DETECTING SYSTEM INCORPORATED,VOF NEW YORK, N. Y.

SPLICING .AND TERMINAL DEVICE lFOR FIRE DETECTING CABLES Application led June 11,

This invention relates to a splicing and connection terminal device for a lire detecting cable adapted to quickly, safely and neatly unite the ends electrically of a conducting core and a conducting insulated sleeve, respectively, the same constituting a special design of fire detecting cable. A

modication thereof is adapted to unite an electrical conductor quickly, safely and neatly to the aforesaid conducting core and another electrical conductor to the aforesaid conducting insulated sleeve.

lVith these and other objects in view, which will become apparent as the present ldescription proceeds, my invention consists of the novel parts and combinations of parts, all as hereinafter will be more fully described and particularly pointed out in the claims. In a copending application for U. S. Letters Patent, filed Julie 11, 1927, under the Serial No. 198,056 there is disclosed an improved design of fire detecting cable adapted for use with the splicing and terminal connection devices illustrated and described in the present patent application.

Referring to the accompanying drawings forming a part of this specification in which like numerals designate like parts in all the views.

Figure 1 is a top plan view of one design of one of my special lire detecting cable splicing devices in association with a pair of cable ends, which are cut back and prepared for splicing.

Figure 2 is an enlarged section of this device in association with one of my lire detecting cable ends cut through as on the line A. B. of Figure 1.

Figure 3 is an enlarged section of this device in association with a pair of my special cable ends cut through on the line C. D. of Figure 1.

Figure it is a top. plan view of a simplified device in association with a cable end, and

two insulated wires adapted to secureelectrical conductors to the core and insulated sleeve respectively of my lire detecting cable.

Figure 5 is a short length of a piece of 1921; serial No. 198,057.

the lire detecting cable partly `in elevation and partly in section, showing the several co-opera'ting parts of the special cable.

Figure G is a vertical sectional view of the cable. f

In the drawings, 1() .is the outer braid of a piece ofmy cable; 10c is a water proofing cover; 11 is a spirally wound strip of conducting materiahbrass for example; 12 is an insulating impregnated material, cotton parafiined for example; and 13 'is a slotted tube of metal, soft steel for example, containing a low melting point fusible alloy 13a, an alloy of lead, tin, and bismuth for example, shown in the slot 14.y 15 is an insulating member, made of moulded material, porcelain, bakelite, or vulcanite for example,'provided with the hole 16, and 16 adapted to receive screws for attachment to woodwork or other building material; 17

and 17 are U-shaped aligned and substan-v tially parallel metal clamps adapted to be securely screwed to the U-shaped metal conducting bridge 1S by the screws 20, 20, 20, 20. The braidl 10 is cut away under the clamp member 17 and 17 allow ing them to make contact with the spirally wound brass conductor 11, thereby completing an electricalcircuit through the conductingbridge 18. f

At substantially the center of the insulating member 15 is a third metal clamping member 21, iny alignment with and substantially parallel to the outer clamps 17, 17, the clamp 21 being securely screwed down to Va similarly shaped metal base piece and to the insulating member 15 through theagency of the screws, 22, and 22` and adapted to unite the cores of my cable extremities, namely the slotted steel tube .containing the fusible alloy. The clamp 21 and its asso ciated metal base piece'are readily seen to occupy the space between thevparallelly disposed branches of the bridge 18 and spaced therefrom to avoid electrical conductivity.

Referring to Figures 2 and 3,`like partsv may be easily identified and their'functions made clear', from the foregoing description.- In Figure 4, is shown a modification of the so g clamping device wherein both the slotted core and the spirally wound conductor 11 are each joined to an ordinary insulated wire such as represented at 25, 25. This form of connection is particularlyV useful at the limits of an electrical section subjected to lire hazards.

Referring to Figure 5, the like parts may be clearly identified and the functions of each made clear in connection with the following description. My fire detecting cable is run throughr a building, and is connected and spliced with the approved deviceherein described, and is connected with electric bat-.

tery and bell, the core and sleeve respectivecore being substantially smaller in cross section than the passage receiving said sheath. Signed at` New York city in the county of New York and State of New- York this seventh day of J une A. D. 1927. Y

WILLIAM DALES LINDSEY.

ly,to leave the circuit open so long as there is no fire and the fusible alloy remains in the slot 14 of the tube 13. lVith fire, however in the path of the cable, 'the fusible alloy melts, passes through the strands .of the cotton insulating materialy 12, and contacts with the brass sleeve 11, thereby com-` ingfdisposed in spaced relation, of meansV The for electrically connecting said coresv and Y sheaths independently of each other, said` means comprising a supporting member of isulating material, spaced' U-shape'd clamps contacting, respectively, directly. with said sheaths and carried by said supporting member, another clamp contactingdirectly with said cores and carried by said supporting member, the sheath 'openingsofsa'idf spaced clamps being lar er in cross-section than the core opening o said other clamp, and means constituting an electrical connectionbetween said spaced clamps.

2. The combination with a cable comprising an electricity-conducting fusible core! projecting beyond an electricity-conducting sheath normally insulated therefrom, of means for effecting independent electrical connection with said c'ore and sheath, said means comprising a supporting member, and

spaced U-shaped clamps disposed on saidA member in side-by-side relation, one of said clamps forming a passage for the reception of said sheath, another of said clamps forming a passage for the reception of said core, said passages being disposed substantially in alinement and the passage receiving said

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