US1748457A - Fluid burner and safety appliance therefor - Google Patents

Description

Feb. 25, 1930. J. PARARRA FLUID BURNER AND SAFETY APPLIANCE THEREFOR 2 Sheets-Sheet 1 Filed Dec. :50. 1-927 INVENTOR.

Bar-arch:

Juliuv- ATTORNEY Feb. 25, 1930.

J. PARARRA FLUID BURNER AND SAFETY APPLIANCE THEREFOR 2 Sheets-Sheet 2 Filed Dec) 30. 1927 lllflllllrtlv.

/lllllflll/A INVENTOR Juliuw Paz-arra A TTORNEY Patented Feb. 25, 1930 PATENT OFFICE JULIUS PABARRA, or narnenroarr, eomrncrrcu'r FLUID BURNER AND SAFETY APPLIANCE THEREFOR Application filed December 80, 1927. Serial No. 248,609.

This invention relates to fluid burners of the type having safety appliances adapted to the pur ose of automatically shuttin off the flow oi fluid to'a burner element w "ch 5 becomes extinguished.

An object of the invention is to rovide a fluid burner the fluid supply line 0 which is normally closed, and a safety appliance associated with said fluid burner and having various features which are of novel and improved construction. w

A further object is to provide a fluid burner including a plurality of burner elements and having a normally closed fluid supply line, and a safety appliance of the present character associated with said fluid burner and with all of its burner elements in a novel and improved manner.

With the above objects in View, as well as others which will appear as the specification proceeds, the invention comprises the construction, arrangement and combination of parts as now to be fully described and as hereinafter to be specifically claimed, it being understood that the disclosure herein is merely illustrative and intended in no way in a limiting sense, changes in details of construction and arrangement of parts being permissible so long as within the spirit of the invention and the scope of the appended claims.

In the accompanying drawing forming a part of this specification,

Fig. 1 is a top plan view of a gas stove including'a plurality of burner elements, disclosing a safety appliance having the features of the invention associated with said gas stove;

of the gas stove as seen from the right in Fig. 2 is an enlarged fragmentary end view.

the operating parts of the safety appliance associated with said control valve, said opera-ting parts being positioned as when the control valve is open Fig. 5 is a view corresponding with the disclosure of Fig. 4, but showing the operating parts of the safety appliance positioned as when the control valve in the fluid supply line is closed;

Fig. 6 is a sectional detail of the means for mounting the actuating lever for the fluid su 'ply line control valve;

ig. 7 is an enlarged sectional view, taken on line 7--7 in Fig. 4, detailing the ball runway of the balance member of the operating 66 -mechanism of the safety appliance;

Fig. 8 is a view, partially in section and partially in elevation, detailing the control valve for the pilot of the gas stove and the mechanism associated with the cock for the 7 center burner element for operating said pilot control valve;

9 is an enlarged sectional view, taken on llne 99 in Fig. 1, detailing the tubular connection between the center burner and each end burner; and

Fig. 10 is a fragmentary longitudinal sectional view of a safety appliance in which the principles of the invention are incorporated, parts of the operating mechanism of said safety appliance being of modified form and being positioned as when the fluid supply line control valve is open.

, With'respect to the drawings and the numerals of reference thereon, 10 represents a 8 gas stove having burner elements 11, 12 and 13 of ordinary or preferred construction and a pilot burner element 14, and 15 designates a gas supply line leading to said elements 11, 12, 13 and 14 via connections denoted 16, 17 18 and 19. Cocks 20, 21 and 22 of any well known construction control the passage of gas from the line 15 through the connections 16, 17 and 18, respectively, to the burner elements 11, 12 and 13, andthe cook 21 for the center burner element has a cam arm'23 for controlling, in a manner to be described, the passage of gas from said line 15 through the connection 19 to the pilot burner element 14. The burner elements 11, 12 and 13 are, as dis- Figs. 1 and 3.

closedi of the usual ring shape and are supporte upon the gas stove in the customary manner. Numeral 24 denotes gas perforations of said burner elements 11, 12 and 13. The pilot 14 is a tube extending in general horizontal direction across the burnerelement 12, the outer end portion of said tube being supported in a small bracket 25 upon the burner element 12, and the free end of the tube desirably terminating in line with the perforations of said burner element. See

The connection 19 between the fluid'supply line 15 and the ilot 14 includes a housing 26 for a control va Ve 27 for said ilot. As disclosed more clearly in Fig. 8, t e housing 26 includes a chamber 28 communicated with by a part of the connection 19 leading from the line 15, a chamber 29 opening to the pilot 14, and a horizontal wall 30 between said chambers 28 and 29 and having a port 31 which the valve 27, within the chamber 29, is adapted to cover. A stem 32 upon said valve 27 and extending freely upwardly through the port 31 and the chamber 28, is carried by a stud 33 having a vertical sliding fit in the housing. A coil spring 34 about the stem 32, in the chamber 28, having its opposite ends in engagement with the wall 30 and the lower end of the stud, respectively, is adapted to seat the valve 27 and cause the upper end of said stud to engage the lower part of the cam face 35 of the cam arm 23 when the cook 21 is in the closed position of the burner element 12, and the higher part of said cam face 35 is adapted to force said stud downwardly against the action of the coil spring 34 to move said valve 27 to open position when said cock is manipulated to allow flow of gas from the line 15 through the connection 17 to the center burner element 12. Also see Fig. 3. Preferably, the cam arm 23 is set to open flow through the pilot 14 slightly ahead of the flow of gas to the center burner element.

A control valve 36 in the gas supply line 15 is adapted to normally close said supply line, and is adapted to be maintained in position to allow the gas supply line to be open, through the instrumentality of a safety appliance, represented generally at 37.

As shown more clearly in Figs. 4 and 5, the gas supply line 15 includes a suitable housmg 38, constructed and incorporated in said gas supply line in any convenient manner, and said housing 38 includes a wall 39 havmg a gas flow port 40 provided with a beveled seat 41 which the control valve 36 is adapted to engage to cover said gas flow port. The upper portion of a valve stem 42, upon which said valve 36 is fixed, is suitably'gulded 111 a spider 43 situated in the housing 38, and the lower portion of said valve stem 42 is guided in a wall 44 of the housing below the valve seat. A' coil spring 45 about the upper portion of the valve stem and having its opposite ends engaging the spider and the valve 36, respectively, serves to normally hold the valve e ressed against the seat 41, to thus fut ofi'the flow of gas through the supply lne.

The operating parts of the safety appli ance 37 for maintainin the valve stem 42 elevated against the action of the spring 45, to thus hold the control valve 36 off its seat and allow flow of gas through the supply line 15 to the gas cooks. for the burner elements, are situated in a suitably constructed casing 46 secured upon a projecting, portion 47 of the housing 38 as by small bolts 48.

Of said operating parts, 49 is a lever for actuating the control valve 36. As disclosed more clearly in Figs. 4, 5 and 6, the lever 49 extends through an opening 50 between the interior of the housing 38 and the interior of the casing 46. A frustro-conical bearing 51 fixed upon said lever 49 intermediate its ends is. mounted in said projecting portion 47 in such manner as to provide a gas seal between the housing and casing and to allow free pivotal or swinging movement of the adjacent end portion 52 of the lever 49 toward and away from the valve stem 42, said end portion 52 being adapted to engage the lower end of said valve stem and lift the same from the position as disclosed in Fig. 5 to that as disclosed in Fig. 4, against the action of the coil spring 45.- The end portion of said lever 49 opposite the control valve is provided with a downwardly disposed hook 53.

The construction includes manually manipulatable means for moving the hook end portion of the actuating lever in direction to cause the end portion 52 to push the valve stem 42 to lift the control valve 36 from its seat, and also includes automatically actuatable mechanism adapted to maintain said control 'valve in the position to which lifted by said manual means only when a part of said automatic mechanism is being acted upon by heat generated by the burning of fluid at a-burner element.

Of said manual means and automatic means, 54 is a balance member pivotally supported in any convenient way, as at 55, u on the base of the casing 46, and 56'is a all adapted to roll upon a suitable runway 57 of said balance member, said ball 56 being capable of moving along said runway 57 from a position against the spring 58 upon the outer end wall of said runway (opposite the lever 49) to position against a cross-bar 59 of said runway between the pivot and said lever 49, pro erably close to said pivot). See Figs. 4,5 and 7.

A trigger member 60 pivotally mounted upon the base of the casing 46, as at 61, between the balance member 54 and the lever 49, is provided with a trigger'62 adapt-ed to engage with the hook 53 of the lever 49, and

said trigger member is weighted at the side of its p1vot opposite the trigger, as indicated at 63, to insure that said trigger can posltion itself for positive engagement with said hook. At the side of the weighted part 63 opposite the trigger 62 said trigger member has a'finger 64 situated above and adapted to be engaged and elevated by a finger 65 upon the inner end of the balance member 54 when said balance member moves from its position as in Fig. 4 to its position as in Fig. 5 in a manner to be set forth. Note that in Fig. 4 the finger 65 is in spaced relation to the finger 64.

An extension 66 upon the inner end of the balance member and above the finger 65 carries a finger piece 67 situated directly beneath an opening in the upper wall of the casing 46, and said opening is covered by a hinged lid 68.

A suitable bracket 69, secured upon the top wall of the casing 46 in any convenient manner, supports a mercury bulb 70 from which a downwardly opening neck or tube 71 extends, said neck or tube passlng throu h the bracket and through an opening 72 in t e top wall of the casing. The lower end or mouth of the neck or tube 71 enters a mercury cup 73 supported in any convenient way upon the inner portion of the balance member; that 73 to hold the ball 56 overbalanced when positioned as in Fig. 4. Upon manual movement of the finger piece downwardly, the hook 53 is made to be caught by the trigger 62 and the weight 63 of the trigger member insures engagement between the trigger and hook so long as the ball remains overbalanced to hold the balance member in its position of Fig. 4, the action of the coil s ring 45 tending to close the valve being in ireotion forcing the weight of the trigger member a ainst the base of the casing 46, as will be c ear from said Fig. 4. I

Upon the flame at the pilot becoming extinguished, the merour bulb will cool off within a ver few secon s, mercury will, naturally, be li ted from the mercury cup to the bulb as the air and mercury in the bulb contract, and the ball 56 will overbalance said mercury cup thus lightened and move from its position of Fig. 4 to its position of Fig. 5, causing the inner endof the balance member to be elevated, aswill be obvious, and the-finger 65 of the balance member to in the meantime strike against the finger 64 of the trigger member to lift the weight of said member and remove the trigger 62 from the hook 53, thus allowing the coil spring 45 to act to move the control valve to closed position. Thereafter, the control valve 36 can only be opened by is to say, supported upon the end portion 0f manually depressing the finger piece 67, the

the balance member between its pivot 55 and the trigger member 60. A desirable shape of the mercury cup 73 is best disclosed in Figs. 3, 4 and 5. A protector for the mercury bulb 70 i may be the mesh cover 74 disclosed.

A tube or pipe 75 supported upon the bracket 69, as. at 76, has one of its endsopening adjacent the pilot 14 and its other end opening adjacent the mercury bulb 70. See Figs. 1 and 3.

Referring to Figs. 1 and 9, I have there shown tubular members 77, supported in any suitable way, between the center burner and each end burner, the ends of each tubular member being situated closely adjacent the burner perforations.

Supposing the operating parts ofthe safety appliance are situated as in Fig. 5, the control valve 36 being closed, and it is desired to light the gas stove, the center cock 21 is turned on, to thus turn on the pilot a little in advance of the main flow to the center burner, the lid 68 is thrown upon its hinge away from the opening above the finger piece 67, said finger piece is depressed from its position in Fig. 5'

to position below that shown in Fig. 4 while a flame is being applied to the pilot or the center burner, and said finger piece is held depressed for a perlod, a few seconds, until the flame at the pilot, acting upon the mercury bulb through the tube or pipe 75, has expanded the air and mercury in said bulb and forced a suflicient amount of mercurydown from the bulb through the tube 71 to the mercury cup mercury in the bulb 70 being of insufiicient weight, even should all of it enter the cup 73, to overbalance the ball when in position at the outer end of the runway as in Fig. 5.

Manual means and automatic mechanism of modified construction, for lifting the control valve and for maintaining said valve lifted, are disclosed in Fig. 10. As here shown, the end portion? 8 (opposite the control valve) of the lever 49 has a finger piece 79 situated beneath an opening in the casing wall covered by a hinged lid 80.

Numeral 81 represents a mercury bulb supported upon the casing in the manner as already described and provided with a downwardly opening neck or tube 82 having its lower end or mouth situated in a mercury cup 83, preferably of rectilinear configuration, stationarily positioned upon the base of the casmg.

An insulating block 84, fixed to the-base of the casing, has spaced contacts, denoted 85 and 86, adapted to be engaged by a contact bridge 87 upon the end portiOn 78.

A magnet 88 upon the base of the casing has a core situated adjacent said end portion 78 when in elevated position and adapted to be engaged by said end portion when depressed. Lead wires to said magnet, denoted 89 and 90, are from the contact 86 and a contact 91 passing through a wall of the cup 83in spaced relation to the base of the cup.

. Lead wires 92 and 93 are from a source ofelectric energy (not shown), the former go- 78 intovengagement with the core of the magnet and thebridge 87 into engagement with the contacts 85 and 86, and said finger piece is held depressed until the flame has forced vber being adapted to mg esaid tri germemberto remove said hoo rom said ook end portion, and mechanism adapted, when acted upon by heat generated by the burning of gas atsaid burner, to render said balance member incapable of actuatingsaid trigger member.

2. The combination with a gasburner, a supply line therefor, and a control valve for said supply line adapted to normally shut oil the flow of gas through said supply line to said gas burner, of a safety appliance coma sufficient amount of mercury to pass from\l)rising manually manipulatable means for the bulb 81 into the cup 83 to cover both of contacts 91 and 94. The magnet 88 is now energized, the flow of current from lead wire 92 to the magnet being via contact 85, bridge 87, contact 86, and lead wire 89 and from the I 'magnet back to lead wire 93 via lead wire'90,

Contact 91, the mercury, and contact 94. Thus the end portion 78 is held depressed against the action of the coil spring.

. When the flame at the pilot becomes extinguished and the mercury bulb cools to cause 5 mercury to be lifted from the cup 83 to the bulb, the connection between the contacts 91 and 94 is broken as soon as the mercury level in the cup 83 falls below the'contact 91, and the magnet, as a consequence, then becomes de-energized. Now the coil spring acts to move the control valve to closed position and to remove the end portions 78 of the lever- 49 and the bridge 87 of said end portion away from the magnet core and the contacts 85 and 0 86 while the mercury is being heated to reach the level of the contact 91.

What I claim is: 1. The combination with a gas burner, a supply line therefor, and a control valve for said supply line adapted to normally shut OK the flow of gas through said supply line to said gas burner, of a safety appliance comprising manually manipulatable means for moving said control valve to the open posltion of said supply line, said manually manipulatable means comprising a lever having a hook end portion, and a balance member adapted to be actuated to move said hook end portion in a direction to cause said lever to open said control valve, a pivotally mounted trigger member between said lever and said balance member, said trigger member including a hook at one side of the pivot for said trigger member adapted to engage said hook end portion, and the portion of said trigger member at the side of its pivot opposite said lever being sufiiciently heavy to insure holding engagement between said hook and said hook end portion maintaining said control valve in open position, said balance memmoving said control valve to the open positionof said supply line, said manually manipulatable means comprising a lever, and a balance member adapted to be actuated to cause said lever to open said control valve, a pivotally mounted trigger between said lever and said balance member including an end portion adapted to engage said lever to maintain said control valve in open position, said balance member being adapted to actuate said trigger member to allow said control valve to close, and mechanism for controlling the capability of said balance member tov so actuate said trigger member, said mechanism being adapted, when acted upon by heat generated by the burning of gas at said burner, to render said balance member incapable of so actuating said trigger member, and being adapted, upon the dissipation of said'heat, to permit said balance member to soactuate said trigger member.

Signed at Bridgeport, in the county of Fairfield, and State of Connecticut, this 28th day of; December, A. D. 1927.

' JULIUS 'PARARRA.

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