US 733184 A
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PATENTED JULY 7, 1903 J. D. GOULD.
APPLICATION rum). F123. 7, 1902.
WITNESSES 8 0 M M 0 w N UNITED STATES Patented July '7, 1903.
JOHN D. GOULD, OF NEW YORK, N. Y.
"OPECIFICATION forming part of Letters Patent No. 733,184, dated July '7, 1903. Application filed February 7, 1902. seen No. 92,959. (No ni del.)
This invention relates to improvements in' thermostats in fire-alarm electric circuits.
In my invention I employ a thermostatic conductorthat is, a conductor having a fusible lead and a copper or other similar lead insulated from each other and designed to become fused by heat, thus closing the alarmcircuit.
In the practical wiring of a building comparatively short lengths of cable are used, and when the ends are left uncovered or open the soft fusible wire when melted is apt to flow out at the end without closing the circuit.
It is the object of my invention, therefore, to provide protecting or sealing coverings for the ends of the thermostatic sections which will prevent the outflow, as above mentioned, and thus insure the fusion of the conductors between the ends.
I will describe a thermostat embodying my invention and then point out thenovel features in the appended claims.
Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.
Figure 1 is a side view of a thermostat embodying my invention. Fig. 2 is a longitudi nal section thereof, and Fig. 3 is a section on the line 3 3 of Fig. 2.
Each section of the thermostat comprises a core 5, of a metal fusible at a comparatively low temperature, and an outer conductor 6, of strands of wire or of a single wire. These conductors 5 and 6 are insulated one from the other by means of paper 7 or the like, cover ing the fusible conductor, and the whole has an insulating-cover 8. For the purpose of Practically, however, the two gaged over the end or ends of a section are sealing devices consisting of caps 10, of suitable insulating materialsuch, for instance, as hard rubber or porcclainand placed within the same is a sealing material 11, of wax, shellac, or the like. As clearly shown in Figs. 1 and 2, the several sections are connected together by means of clamping-screws 12, engaging in a block 13 of insulating material. The caps 10 are provided with openings, either at the sides or at the ends, through which portions of the wires may extend. By this arrangement it will be seen that in case of fire attacking the wire or a section of the thermostat the heat will be practically confined between the euds or cap-pieces and as the fusible wire melts it will fuse or contact with the conductor 6, thus closing the circuit.
Having thus described my invention, 1 claim as new and desire to secure by Letters Patent 1. Athermostatcomprising two conductors insulated one from the other, a covering for the two conductors, one conductor being fusible, and a sealing device of insulating material forthe end of a thermostatic section, sub stantially as specified.
2. Athermostat comprising two conductors, insulated from each other, a covering for the .two conductors, one conductor being fusible,
and caps of insulating material for engaging over the ends of the'conductors, substantially as specified.
3. A thermostatcomprising two conductors insulated from each other, a covering for the two conductors, one conductor being fusible, caps for engaging over the ends of the conductors, and sealing material in the caps, substantially as specified.
4. A sectional thermostat, each section comprising two conductors insulated one from the other, a covering for the two conductors, one
conductor being fusible, caps of insulating material engaged over the ends of the sections, the said caps having openings through which the conductors may pass, and a sealing material in the caps, substantially as specified.
5. A sectional thermostat, comprising sections of cables, each section including conductors, one of which is fusible, and a suitarated from contact with the other member by said insulation, of means connected with the opposite ends of the said thermostatic cable for preventing movement of the fusible material under heatlongitudinally of the conducting member with which it is in contact and to effect movement of the fusible material laterally with relation to said conducting member to effect the connection between the said conducting members, for the purpose specified.
7. The combination with a thermostatic cable having a fusible member, of pieces or blocks of insulating material covering the ends of the thermostatic cable to prevent movement of the fusible member in the direction of the length of the wire under the influence of heat, substantially as and for the purpose specified.
8. The combination with a thermostatic cable having a fusible member, of a device composed of insulating material for closing the ends of the cable against longitudinal movement of the fusible member under the influence of heat, substantially as described.
9. The combination with a thermostatic cable having a fusible member, of devices at the ends of said cable for closing the ends of the cable against longitudinal movement of the fusible metal, and terminals to which said thermostatic cable is electricaily connected, for the purpose specified.
10. The combination with a thermostatic cable having a fusible member, of means extraneous to the cable for preventing movement of the fusible member longitudinally of the cable under the influence of heat, for the purpose specified.
In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.
JOHN D. GOULD.
J NO. M. BITTER, O. R. FERGUSON.