US247737A

US247737A - Electric gas-lighting apparatus

Info

Publication number: US247737A
Authority: US
Publication date: 1881-10-04
Anticipated expiration: 1898-10-04

Description

(No Model.) 2 sneeahsheet 1.

7 G D. BANOROPT. ELECTRIC GAS LIGHTING APPARATUS.

No. 247,737. Patented Oct. 4,1881.

l -0 j 0 32 1 12 721 I5 '7) Z I (I O 7 L7 77 U H'- W M I ZMI 7 7 I I WITNESSES l I V V lNYENTDR v g gum )3 i 4..

(No Model.) I 2 Sheet-heet 2. G. D. BANUROFT.

ELECTRIC GAS LIGHTING APPARATUS. No. 247,737. A M Patented 001;. 4,1881.

,Jv Fl 5 7 j/ x 52 5311:?

0 ml in I I WITNESSES A l 'JR N. PEIERS Pnm-Limo m hw. Washington. DV 0 UNITED STATES PATENT OFFICE.

GEORGE D. BANGROFT, OF BOSTON, MASSACHUSETTS.

ELECTRIC GAS-LIGHTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 247,737, dated October 4, 1881.

' Application filed August 1, 1881, (No model.)

To all whom it may concern:

Be it knownt-hat I, GEORGE D. BANoRoFT, of Boston, in the State of Massachusetts, have invented a new and useful Improvement in Electric Gas-Lighting Apparatus, of which the following is a specification.

The invention relates to an electrically-com trolled mechanism for lighting and extinguishing gas, the principal feature of which is a thermo-spring acting at the temperature of the atmosphere in one direction to open the gascock, but when heated by the flame of the gas actingin the contrary direction to close the gas-cock, substantially as described in my Patent No. 205,032.

It sometimes happens that the gas is extinguished accidentally at one or more of the burners in a circuit before it is-turned oft throughout the circuit by the proper operation of the electro-mechanism, and when this is the case atany particularburner the thermo-spring at that burner, being no longer in the flame,

' thermo-spring itself when it has become cool to move it sufliciently in to close the gas-cock.

The apparatus to which I have applied the the proper direction present invention, as shown in the drawings,

my invention, the gas-cock closed and the thermo-spring at the temperature of the atmosphere. Fig. 2 is a front elevation of the same, but with the gas-cock open and the thermo-spring at the temperature of the atmosphere, the gas having been accidentally extinguished without closing the cock. Fig. 3 is a side elevation of the apparatus in the condition shown at Fig. 2, the rod K, however,in section.

A is the burner; B, its cock, having at its forward end, outside of the burner, a segmentarm, 0, by which it is turned. The cock B, between the burner and the segment-arm O, for a purpose to be described is cut away so that a cross-section of the part remaining is a sector of a circle, as shown at :0.

D is an electro-magnet, in construction and mode of operation like the electro-magnet described and shown in my said Patent N 0. 239,014, being a cylindrical box of iron with a hollow core, around which is wound a wire. The core (not shown) is threaded at the upper end to receive the gas-burner, and at thelower end to screw upon the gas-pipe.

E is the armature, hinged to the box, as shown, and when the magnet is demagnetized kept up by a spring, 8. The armature E has a large hole to permit the passage of the burner A and two small holes, through which pass two stiff heavy wires, w 20 which are united near the gas-tip by a platinum wire, 19, The other ends of the wires 'w 10 are connected with the line, the coil of the electro-magnet being in the wire 10.

Gr is a thermo-sprin g, supported at one end by an arm, m, extending from the cylindrical box, and having its other end clamped in a block,f, sliding upon a rod, g, which, in turn, slides in a bracket, Z, upon the cylindrical box, and which at its inner end is attached to a crank-pin, a, on the segment-arm U. The rod 9 is threaded and carries two adjustable nuts, 01/ n limiting its motion in the bracket 1, n n being two other nuts on said arm, for a purpose which will appear.

J is a spring coiled around one sleeve, t, and within a second sleeve, t, in the arm g, as shown. The sleeves are merely for the proother against the nut a.

moves on the arm g from the nut n it compresses the spring against the nut a", and if then the blockf continues to move under the force of the thermo-spring the arm 1 is carried outward, moving with it the segment-arm C. If, after the spring J is compressed, the block fis held stationary in a manner which will hereinafterappear, and the arm g is allowed to move through the blockf, the springJ, acting against the nut a under the resistance of the nut n will in turn carry the arm 9 outward and with the movement of the arm turn the segment arm 0 outward.

K is a rod loosely pivoted at one end to the blockf, and having near its other or free end, upon the upper side, a cam-shaped projection, e, and upon the lower side a notch, 7.". The free end of the rod K rests upon the catch 00, which in a certain position locks in the notch k of the rod K, while in all other positions it allows the rod K to slide over it in either (lirection.

The segment-arm O has two shoulders, c and c, and the armature E has a projection, 1), against which one of the shoulders c c catches when the armature is lifted by the spring 8. The armature carries also a yoke, T,an adj ustable set-screw, o, in which reaches far enough down to strike the cam-projection a when the armature is in contact with its magnet.

The pressure of the thermo-spring is inward at ordinary temperatures of the atmosphere, and outward when heated by the flame of the gas. In the normal condition of the apparatus the thermospring is cold, and the shoulder 0 of the segment-arm O rests upon the projection I). In this condition of the apparatus the cock is closed and the angle of the catch :20 points upward, the rod K resting lightly upon it.

The operation is as follows: A single impulse sent through the line causes the magnet D to attractits armature E, and thereby rcleases the shoulder c from the projection 11. The thermo-spring,being cold, and acting upon the nut a on the arm g, presses the segmentarm 0 inward, opening the gas-cock B and turning catch w to the position shown in Fi 2. The wire 1) in the meantime is broughtto a white-heat and lights the gas. The current is then broken, and the armature rising, the shoulder c is caught upon the projection b and the cock kept open. The gas continuing to burn, the thermo-springbecomes heated, and, pressing outward, closes the spring J upon the nut a and draws the rod K outward until the notch looks with the catch an, the locking taking placejust when the spring J is closed. If now the gas has continued to burn a second impulse sent over the line will release the shoulder c from the projection b, and the thermo-spriug, continuing to press outward, will carry the arm 9 still farther outward and turn off the gas; but if the gas has been accidentally extinguished any considerable length of time before the second impulse is sent over the line, the second impulse will then release the shoulder c from the projection 12, and now the thermo-spring, although cold, cannot press inward, since the notch 70 is locked upon the catch or. The arm g, however, is free to move through the block f, which is driven by the thermo-spring G against the nut a and the spring J accordingly, acting against the nut a under the resistance of the nut a carries the rod outward and turns off the gas.

It is obvious that the catch or and notch k must unlock when the arm 9 begins to move outward and to turn the gas-cock. In order, therefore, that the rod K may continue to furnish suificient resistance to the thermo-sprin g for the operation just described, even if the spring J is sluggish in its movement, the setscrew 0 in the yoke T is adjustable to strike the upper part of the cam-projection e on the rod K at the moment the unlocking takes place, thereby binding or clamping the rod between the moving catch a; and the set-screw 0, and furnishing a resistance to the thermo-spring.

The cam-projection e is cut away on the top, as shown, in order to let it pass freely under the set-screw when the armature is attracted to the electro-magnet for the purpose of disengaging shoulder c and engaging shoulder c with the catch I).

I claim 1. In an electrical gas-lighting apparatus. substantially as described, the combination of the catch or, notched rod K, and spring J with the gas-cock B, thermo-spring G, and arm g, for the purpose specified.

2. The burner and electric apparatus, substantially as described, in combination with the catch 00 upon the gas-cock, the yoke T, with its set-screw 0, the segment-arm O, with shoulders c c, the thermo-spring G, the arm 9, provided with proper stops or nuts, the spring J, rod K, notch 70, and cam-projection c, for the purpose specified.

GEORGE D. BANCROFT.

Witnesses:

W. W. SWAN, H. G. OLMSIED.