US908230A - Safety gas-burner. - Google Patents

Description

A. R, FARMER. SAFETY GAS BURNER. APPLICATION :FILED SEPT. 24, 1908.'

Patented Dec. 29, 1908.

nu: Nmzms Prrsxs ca.. wAsHmcro, D. c.

N Ana EETCE.

ARCIDAS R. FARMER, OF BRAINTREE, MASSACHUSETTS, ASSIGNOR TO .TEREMIAH M. PINEAU, OF BRAINTREE, MASSACHUSETTS.

SAFE TY GAS-BURNER.

T o all whom 'it may concern:

Be it known that I, ARCIDAs R. FARMER, a citizen of the United States, residing at Braintree, in the county of Norfolk and State of Massachusetts, have invented new and useful Improvements in Safety Gas- Burners, of which the following is a specification.

rhis invention relates to that class of safety gas-burners in which, when the gas is extinguished by accident or otherwise, t-he gas-cock closes automatically and the invention consists in the novel construction and arrangements of parts hereinafter described and illustrated in the accompanying drawings, whereby a locking-mechanism which holos the gas-cock open when the gas is lighted is released by the contraction of a wire when the flame is extinguished, and other mechanism intermediate of the gascock and the main portion of the burner is allowed to close said cock and to shut off the gas.

rlhe nature of the invention is fullyT described in detail below, and illustrated in the accompanying drawing, in which Figure 1 is a side elevation of a gas-burner embodying my invention, in its normal closed position. Fig. 2 is a view partly in side elevation and partly in vertical section of the same in an open position, that is, in the position assumed when the gas is burning. Fig. 3 is an end elevation looking toward the right. Fig. 4 is a section taken on line 4-4,'Fig. 2.

Similar characters of reference indicate corresponding parts.

Reference numeral 10 represents the main portion or body of the gas-burner provided with a suitable tip 1l, and 12 is the inletpipe.

18 is the gas-cock.

Extending from opposite sides of the vertical portion of the burner are arms 14 and 15 which spread as shown in the same vertical plane as the upper portion of the gasburner.

16 is a lever pivotally connected at 17 to the upper portion of the arm 15, and adapted to swing in a vertical plane. A horizontal metallic wire 18 connects the short arm of this lever at a oint but a little above the pivot 17 with t 1e upper end of the arm 14, said wire extending nearly over the burnertip 11. 'Ihe lower end of the long arm of Specification of Letters Patent.

Application led September 24, 1908.

Patented Dec. 29, 190B.

Serial No. 454,651.

this lever extends down through an opening or slot 19 in a horizontal tubular frame 20 integral with the body of the burner, the tubular central portion 2l of said frame operating as a slideway for a horizontal bolt 22 whose rounded inner end is held normally against the barrel or shank 23 of the gascook by a spring 24 which surrounds the bolt and is held between a pin 25 and the portion 21, an opening 27 (Fig. 2) being formed in the burner in order to allow the curved end 26 of the bolt to reach the shank 23. The rear end of the bolt slides in the corresponding end of the frame 20, as illustrated in Fig. 2, and the portion of the bolt between said rear end and that portion surrounded by the spring is formed into a ratchet-bar 28 whose teeth point horizontally inward or toward the spring, said ratchet-bar being recessed at 29 whereby a shoulder 30 is formed, and its movement being limited by a stoppin 31.

It is evident that longitudinal expansion of the wire 18 will swing the lower end of the long arm ol' the lever 16 toward the right, and contraction of the said wire will swing the lever toward the left, and in swinging toward the left it will engage the teeth of the ratchet-bar, but in swinging' toward the right it will slip by them. As the slotted portion 2O of the frame has one edge of its slot 19 formed into a bevel or cam 32` see Fig. 4) it is also evident that the long arm 16 of the lever can be held sprung' into engagement with the ratchet-bar 28 only when it is between said cam and the portion 21 of the tubular frame, inasmuch as the cam overlaps the said teeth toward the outer end of the frame 20 and forces the lower end of the arm 16 out of engagement.

The shank or barrel 23 of the gas-cock is provided with an upward extension 33 screwthreaded at its op osite ends and provided with a nut 34 at its ower end. lts upper end extends into a downwardly extending tubular bracket 35 integral with the arm 14, and is provided with suitable nuts 36, 37. A spring 38 surrounds this extension 33 and has its lower end secured thereto at 39, and the upper portion ot this spring' is provided with a straight extension 40 which bears against the face of the arm 14. This spring holds the gas-cock normally closed when it is not locked in an o en position by the bolt 22, as in Eig. 2 in w `ch its rounded end 26 is shown as extending into a correspondingly shaped depression or socket 41 in the shank 23 of the gas-cock.

In practical operation, the gas-burner being as illustrated in Fig. 1, the tip is lighted in the usual manner by turning the gas-cock and igniting the gas. The gas-cock when tnrned fully on will be held in such position against the power of the spring 38 by the bolt 22 whose end 26 will have slipped into the socket 41. The flame heats and consequently expands the wire 18, thus pushing toward the left the short arm of the lever 16 and swinging the long arm toward the right in the slot 19, said long arm pressing against and slipping over the ratchet teeth 28 which, as above stated, face inward or toward the right. Should the flame be accidentally extinguished, as b a draft of air, or blown out, the wire 18 wou d immediately begin to contract7 and as it contracted', the lower end of the lever 16 would engage one of the teeth of the ratchet 28 and as it continued to contract pull the lock 22 toward the left and withdraw its end 26 from the socket 41. As soon as it is thus withdrawn the gas-cock 13 is freed and the spring 38 rotates it into its original closed position. As the wire continues further to contract the lower end of the lever 16 reaches the cam 32 and is forced out of the teeth of the ratchet, thus releasing the bolt which immediately springs against the surface of the shank 23, as illustrated by dotted lines in Fig. 1. This operation, which occupies but a fraction of a minute, places the parts in their original normal position, thus shutting off the gas. Thus it will be seen that in case the flame is extinguished by Hblowing out the gas, or by any accident, the gas continues to escape but a very short time and with decreasing force before the gas-cock is closed; and while the gascock is open to its full extent it is held Aand locked in such open position. When it is desired to extinguish the gas in the usual manner there is no difliculty in rotating the gas-cock as the rounded end 26 of the bolt can be easily forced out of the correspondingly shaped socket 41, the ratchet-teeth 32 slip ing by the lever 16.

T ie part 18 is a metallic wire or bar of such thickness or diameter as is deemed advisable with regard on the one hand to reasonably quick contraction and on the other hand to a suitable length of service, and is by means of the small brackets or offsets 42 located sufficiently at one side of the burner to prevent direct contact with the flame.

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

1. In a safety gas-burner, the burner-body,

arms extending upward on opposite sides of the upright portion of the urner-body, a gas-cock whose shank is provided with a depression or socket, a vertically slotted horizontal frame supported by the burnerbody and provided at the rear end of one side of its slot with an inwardly extending cam, a locking bolt bearing normally against the shank of the gas-cock in the line of rotation of the depression or socket thereon and with its shank provided with ratchet-teeth facing or inclined toward the gas-cock, alever pivotally connected near its upper end to Vone of said arms and with its lower end extending into said slot and against the toothed shank of the locking-bolt, a metallic wire Aor bar extending from the short arm of the lever through a point near the location ofthe flame to the arm on the opposite side of the burner-body, whereby when the gas is lighted the gas-cock is held open by said locking-bolt and spring, and mechanism for closing and holding in a closed position the gas-cock when it is released by the said bolt and spring.

2. In a safety gas-burner, the burnerbody, arms extending upward on opposite sides of the upright portion of the burnerbody, a gas-cock whose shank is provided with a depression or socket, a vertically slotted horizontal frame supported by the burner-body and provided at the rear end of one side of its slot with an inwardly extending cam, a locking bolt bearing normally against the shank of the gas-cock in the line of rotation of the depression or socket thereon and with its shank provided with ratchetteeth facing or inclined toward the gas-cock, a lever pivotally connected near its upper end to one of said arms and with its lower end extending into said slot and against the toothed shank of the locking bolt, a metallic wire or bar extending from the short arm of the lever through a point near the location of the flame to the armV on the opposite side of the burner-body, an extension rigid with the shank of the gas-cock and extending upward therefrom, and a spring secured to said extension and bearing against one of said arms whereby the gas-cock is held normally closed and whereby said gas-cock is closed when the contraction of the wire or bar after the light has been extinguished releases the locking-mechanism.

In testimony whereof I have signed my ARcrDAs R. FARMER.

Witnesses:

WALTER S. PINKHAM, HENRY W. WILLIAMS.

Images