US1659279A - Torch - Google Patents

Description

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UNITED STATES reserveN PATENT OFFICE.v

GEORG-E A. MORRISON, OF IARK RIDGE, ILLINOIS, ASSIGNOR TO TORCHWELD EQUIP- MENT COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAVV'AEEE.,nv

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Application filed March 19, 1927. Serial No. 176,678.

My invention relates more particularly to torches employing as the iuel, mixed gases, as tor example and more especially oxygen and acetylene, and involving a so-called flash-back chamber extending at a side oit' the mixer device in which the gases are mixed and operating to retain, during the normal operation ot the torch, a body ofthe mixed gases ttor ignition in the case ot flashback to effect the extinguishmentot the 'iiame in the torch substantially as disclosed in U. S. Patent No. 1,304,198 granted to Carl J. Nyquist, May 20, 1919.

It has been found in practice that it is necessary, in order that the torch function to the best advantage, that leakage ot the oxygen into the acetylene gas passage and leakage ot the acetylene gas into the flashback chamber be prevented inasmuch as either leakage referred to is liable to result, in case oi flash-back, in sustaining the flashback resulting in the continued burning of the gas internally of the torch` it being my primary object to prevent such objectionable intermixture ot the gases to the end that when a Itlash-back occurs, the flame in the torch `will become extinguished and remain extinguished until the gas mixture is ignited at the tip. i

Referring to the accompanying drawings:

Figures 1 and 1a are views in longitudinal sectional elevation of a so-called cutting torch embodying' my improvements, these views being continuations ot one another. Figure 2 is a view in side velevation of the mixer ydevice of the torch; and Figure 3, an enlarged sectional view ot the mixer device and the surrounding body portion ot the torch, the section being taken at the line 3-3 on Fig. 1 and viewed in the direction of the arrows.

The torch shown comprises ahandle portion si; formed oi a block 5 and a surroundf ing shell, the block 5 containing an acetyiene gas passage 7 communicating with a valved itting 8 which would be connected with any suitable source of acetylene gas. The block 5 also contains a passage 9 com municating with a iitting 10 which would be connected with any suitable supply ot oxygen under pressure, the acetylene gas passage 7 communicating with one end oit a pipe 11 and the passage 9 communicating with a high pressure oxygen pipe 12 and a low pressure oxygen pipe 13. The connections between the passage 9 andthepipes-12V and 13 and the means whereby the pipe 12 is is suppliedwith high pressure oxygen and the pipe 13 with low-pressure oxygen is not illustrated as this forms no part ot' my present invention and such au arrangement and provision of parts is well known in the art.'

The pipe 13 connects at its 41forward end with passage-equipped fittings 14, 15 and 16, as is well known in the art, the 'forward end of the fitting 16 screwing into'the rear end of a socket 17 in the head or body portion, 18. The forward end of the socket 17, and represented at' 19, opens into a passage 20 which, in turn, opensinto achamber 21 in the forward end of the head and in communication with the passagesQQ as usually provided `in the burner tip 23 mountedin the extremity of the head 18 and through which the mixture ot i acetylene and lowpressure oxygen discharges for ignition at the end ci the tip. The highfpressurc oxygen pipe 12 communicates with a passage 9A opening into a centrally disposed passage 25 inthe burner tip and throughwhich highpressure oxygen is discharged tor mixture with the intermixed acetylene andthe lowpressure oxygen discharging through the passages 22, in the use ot the torch for cutting purposes.

The head 18 between the ends ot the socket 17lcontains a passage 26 communicating with the acetylene pipe 11, the head 18 between the passage 26 and the forward extremity of thesocket 17 containing a circu lar tapering seat 27. The socket 17 is threaded rearwardly from thepassage 26 as represented at `28 andat the rear end ot' this threaded portion presents an annular seat 29.

The mixer device by which the low-pressure oxygen and the acetylene gas are mixed for discharge into the passage 20 and thence into the burner tip is represented at 30 and is secured in the socket 17 by the engagement ot its threaded portion 31 with the threads 281.` The forward extremityof the mixer 3() is of such external diameter andis of suchlength thatwhen positioned in the body portion 1S it extends in spaced relation to the socket 17 as shown thereby affording a Hash-back chamber 32 Ain which, during the normal ,operationot the torch, a coinbustible `body composed' of acetylene and oxygen is maintained, this iash-back chamber being in communication with the longitudinal bore 33 ofthe mixer device through a passage 34 in the latter and inclining in the direction of the flow of gas through the mixer device. The mixer device is :termed With an lannularbeveled shoulder 35 adapted to seat against the shoulder 2T and with an annular shoulder 36 adapted to engage the seat 29, the Wall ot the mixer device between the shoulder 35 and thethreaded portion I3() thereof being spaced from the Wall oit the socket-1T to provide a chamber 3T in conn munication with the acetylene gas pa i' 26, the chamber 37 being in comnmnication with the central passage 33 ci' the miner dcvioe through forwardly inclined radial passages 38 in the mixer device.

The internal contour `of the socket 11T Yand the external contour ci. the mixer device are such that when the mixer device 30 yis screwed into the .body 18 to the position shown inFig. l, the shoulders and 36 Will forcibly press againstithe seats 27 and 29 and form gas-tight joints one between the acetylene gas passage 26 and the loupressure oxygen passage and the other be tween this acetylene gas passage `and the flash-back chamber 32, thereby etliectually preventing leaking ot the oxygen into the Vacetylene gas passage Q6 `and the leakage of acetylene from this ypassage `into the tlaslr back chamber 3&2 and thus `preventing the sustaining oit' the flame in the torch 'in the event of flash-back which ignites the charge in the flash-back chamber 32 and produces cxtinguishment ot' the entire flame in the torch.

In the manufacture of the torches, the mixer device is termed to cause. the distance between its shoulders 35 and 3G tobe slightly greater, as for example about 3/1000 of an inch, than the distance between `theseats 27 and Q8, which ensures the production ot the desired gas-tight joints `above referred to, it being understood that by "reason oit 4the provision of the seats 27 and 35 as shown, and the forming ot the body 18 and the mixer 3l of brass and bronze, rcsijiectively, `which are the materials usually used for these parts in torches as commonly pro vided, the metal at this forward joint becomes deformed in the drawing of the shoulder 36 into tight engagement .with the seat 29.

While I have illustrated and described a particular construction embodying my invention, I do not'wish to be understood as intending to limit it thereto, asthe same may be variously modified and altered Without departing from the spirit of my intenn tion..

What I claim as new, and desire toV secure by Letters Patent, is:

l. .A gas-torch comprising a body-portion `containing passages tor gases, respectively, a mixer device in said body portion and in communication at its rear end with one of said passages and intermediate itsl ends with the other oft said passages, a flashback chamber at the side of said niixer device in front ot said last-rcferred-to passage, and seats in said body portion between said flashback chamber and said last-reterred-to passage and between said passages, respectively, and iacing in a direction away from said flashback chamber, and engaged by portions ot said mixer-device to Ylorm gas-tight joints.

i3. A gas-torch comprising a body portion containing passages for gases, respectively, a mixer device in said body portion and in communication at its rear end with one of .said passages and intermediate its ends with the other ot said passages, a flashback chamber at: thc side ot said mixer device in trout ot said last-ret'erred-to passage, and seats in said body portion between said Hash hack chamber and said last-retcrred-to passage and between said passages, respectively, and facing in a direction away 'from said tiaslnback chalutier, and engaged by portions ot said mixer-device to form gas-tight joints, said tirst-referred-to seat being beveled.

3. i gas-torch comprising a body-portion containing pzfissagcs for gases, respectively, a one-piece mixer device screwed into said body portion and in communitattion at its rear end with one ot said passages and between .its forward end and its threaded portion with the other ot said passages, a flashback cliamber at the side ot said mixer device in 'trent ot' said last1'eierred-to passage, and seats in said body port-ion between said tlashwback chamber and said lastfreferred-to passage and between said passages to the rear oit the threaded portion ot said mixer device, respectively, and facing in a direction away from said chamber and engaged by portions of said mixer device to form gas-tight joints.

it- A gas-torch, cemprising a body-portion containing passages 'tor gases, respectively, a mixer device in said body portion and in connnunication at its rear end with one of said passages and intermediate its ends with the other ot ,id passages, a flash-back chamber at the sine oi said mixer device in front of said last-referred-to passages, and seats ot dillerent diameters in said body portion between said flashback chamber and said last-relerred-to passage and between' said passages, respectively, and iacing in a-dircc tion away trom said chamber and engaged by portions ot said mixer-device to form gas-tight joints, the smaller ot said seats being innermost.

GEORGE n. MORRISON.

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