US358161A - Electrical gas-alarm - Google Patents

Description

(No Model.)

' W. McVAY.

- ELECTRICAL GAS ALARM. No. 358,161. Patented Feb 22, 1887.

WITNESSES: J INVENTOR:

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UNITED STATES PATENT ()FFICE.

WILLIAM llICVAY, OF QUINCY, ILLINOIS.

ELECTRICAL GAS-ALARM.

SPECIFICATION forming part of Letters Patent No. 358,161, dated February 22, 1887.

(No model.)

To all whom it may concern:

Be it known that I, WILLIAM MOVAY, of Quincy, in the county of Adams and State of Illinois, have invented a new and Improved Electrical Gas-Alarm, of which the following is a specification, reference being had to the annexed drawings, forming a part thereof, in

which- Figure 1 is a side elevation of agas bracket and burner with my improvement applied. Fig. 2 is a plan View. Fig. 3 is an enlarged detail sectional view of the thermostat and thermostat-holder. Fig. 4 is an enlarged perspective view of the thermostat-holder. Fig. 5 is an enlarged view of a detail to be described.

Similar letters of reference indicate corresponding parts in the different figures of the drawings.

The object of my invention is to provide a simple and efficient device for establishing an electric circuit when the gas-flame is extinguished, and for breaking the. circuit and holding it open while the gas-flame is burning.

My invention consists in the combination, with the burner, of a thermostat held near the tip and within reach of the flame andaswitch applied to the gas-key for breaking the connection with the thermostat when the gas is turned off from the burner.

The burner A and gaskeyB are of the usual well-known description. To the burner, near the tip a, is fitted a collar, b, provided with an. arm, a, carrying a split sleeve, (Z, arranged at right angles with the axis of the burner. To the split sleeve cl is fitted a brass tube, 6, having the closed endf provided with a lining, g, of aluminium or other unoXidable metal. To the tube 0 is fitted a glass tube, h, in which is sealed a platinum wire, 17, which projects beyond the end of the glass tube and contacts with the aluminium lining y when the brass tube e is cold. The glass tube h is secured in the tube 6 by means of a wedge or by cement, or in any other convenient way. Electrical wires j 7c are connected with the platinum wire 2' and the brass tube e.

To the smaller end of the gas-key B is fitted a plate, Z, projecting equally in opposite direct-ions from the key and arranged parallel with the -thumb-piece of the key. To the bracket m, in which the key is fitted, is secured an apertured plate, a, surrounding the key and secured to the bracket. The ends of the plate are turned over toward each other and bent down upon L-shaped pieces 0 0, of platinum or copper, with an intervening insulation, 1). The L-shaped pieces 0 0 project upward into the path of the plate Z, so that when the key B is turned so as to let the gas into the burner the ends of the plate I will touch the insulated right-angled pieces 0 0 and establish an electrical connection between them through the plate Z. The electric circuit is from the battery through the wire g to the angled plate 0, and the angled plate 0 is con nected by the wire is with the tube 0, and the platinum wire i is connected by the wire j with the bell and battery.

When the gas is turned on by turning the key B, the electrical connection from the bat tery through the bell is established through the angled plates 0, 0, and Z, tube 0, and the platinum wire in the manner described; but as soon as the gas islighted and the tube 6 is heated, its rate of expansion being greater than that of the tube h, it carries the aluminium lining g away from the platinum wire,and thus breaks the electrical connection; but should the gas be extinguished without turning the key B, so as to break the circuit between the angled platcs00,the cooling down of the tube 6 would bring the aluminium liningg into contactwith the platinum wire 1, and thus establish the electric circuit-,which would cause the ringing of the electric alarm-bell and attract attention to the burner.

My improvement is especially adapted for use in hotels and boarding-houses, where people unused to gas are liable to blow out the gas-flame, leaving the gas turned on.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, in a thermostat for gas burners, oftheexpansion-tube e,providedwith the unoxidable lining g, the platinum wire "5, and the glass tube h, inclosing the platinum wire and secured in the open end of the expansion-tube c, substantially as shown and described.

2. Thecombination of the expansion-tube e,

provided with the unoxidable lining g, the the platinum wire'i, of the switch formed of the IO platinum wire 6, the glass tube h, inclosing the plate Z, carried by the key, the insulated L- platinum wire and secured in the open end of shaped pieces 0 0, supported in the path of the eXpansion-tubee,and the collar b, provided the plate Z, and the electrical. connections, sub- 5 with the arm candsplitsleeve (Z, substantially stantially as shown and described.

as shown and described. WILLIAM MOVAY.

3. The combination, with the thermostat formed of the expansion-tube e,having the unoxidable lining g, and the glass tube h, covering Vitnesses:

B. W. MONTGOMERY, F. O. PARKER.

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