US2031415A - Safety device for gas ranges, gas boilers, etc. - Google Patents

Description

.Feb. 18,1936. w KATZ 7. 2,031,415

SAFETY DEVICE FOR GAS RANGES; GAS BOILERS, ETC

Original Filed April 15', 1931 INVENTOR Willy ifaiz ATTORNEY vll Another object of my invention is the provision Patented Feb. 1a, 1936 UNITED STATES SAFETY DEVICE FOR GAS RANGES, GAS

' BOILERS, ETC.

Willy Kata, New York, N. Y.

Continuation 01' application Serial No. 530,263. April 15, 1931. This application August 12,

1933, Serial No. 684,908

1 Claim.

This invention relates to improvements in safety devices. particularly to an electrically controlled valve for gas stoves or the like gas consuming apparatus, as for instance disclosed in 6 my pending application, Serial Number 530,263, filed April 15,1931, of which this application is a continuation and for which it is to be substituted.

It is the principal object of my invention to 10 provide a safety device in which the gas is ignited by means of a resistance and its supply is controlled by an electromagnetically operated valve ensuring the lighting of the gas and preventing any escape of gas when not ignited.

of a safety device for gas stoves equipped with a thermostat of the bi-metallic type to keep the electromagnetic-ally controlled valve open while the gas is ignited and to close the valve as soon" as the gas flame is extinguished.

Still another object of my invention is the provision of a safety device for gas stoves equipped with means to allow a mechanical operation of the opening and closing means for the electric circuits, yet preventing accidental operation thereof.

A further object of my invention is the provi-' son of mechanically operated contact means to close the ignitercireuit and open the gas supply valveto the burner and to open said circuit as soon as the gas has beenignited.

A still further object of my invention is th provision of a control system for the burners of gas ranges or the like avoiding the use of pilot lights and positively preventing accidents by the escape of gas from an unlit stove permitting a manual operation of the circuit closers as well as their automatic closing and opening during the operation of the stove.

40 These and other objects and advantages of my invention will become more fully known as the description thereof proceeds and will then be more specifically defined in the appended claim.

In the accompanying drawing forming a material part of this disclosure:

Fig. 1 is a sectional side elevation of a safety device for gas ranges constructed according to my invention.

Fig. 2 is an end view thereof.

.30 Fig. 3 is a section on line III-III of Figure 2.

Fig. 4 is a detail view of a gas burner with a thermostat circuit closer.

As illustrated. a gas supply pipe 42 connected at its lower end with any gas supply pipe in the 55 usual manner is connected with a valve casing lever 4 into 48 at its upper end and the flow of the gas is controlled by the usual manually operated regulating valve l8.

The valve casing 48 is connected by a pipe stem 49 having an air vent with the gas burner 4|. while a nozzle 44 is screwed into valve casing and pipe stem.

. an accidental operation of the same. is

The rear end of push button i is equipped with a flange 53 adapted toengage a nose formed on a lever 4 intermediate its'ends.

Lever 4 of insulating material is attached at its lower end to a shaft 56, and at its upper end has connected thereto one end of a spring 24, the other end of which is connected to a peg on the inner wall of casing 50.

The lever 4 is also connected at its upper end by means of a link connection 54 with a piston 55 working in the dash pct ii.

The lower end of lever 4 is curved and carries a pawl 25 pressed by means of a spring 48 into engagement with the teeth of, a comparatively large ratchet wheel 5 of non-conducting material rotatably arranged on the insulated shaft 56 and provided at its front face with the pairwise arranged contaet. pieces 23 and 3| and 23'-3l' respectively. p

In front of wheel 5 shaft 56 carries a wheel I also of non-conducting material secured thereto and equipped with contact pieces 36, 31 on its front face.

Upon the rotation of wheel 5 by means of lever 4 its contact pieces 23 and Si come into contact with spring contacts 30 and 2| while contact pieces 36, 31 of wheel 3 must be of a size suiilcient to bring them upon the rotation of wheel 3 by engagement with contact springs 22 and 2. 45

Contact 30 is connected by a conductor wire 28 to one pole 32 of a battery or plug socket of a source of electricity, while contact 2| is connected by a wire 38 to one end of a resistance coil l2. the other end of which is connected by means of wire 40 to the other pole 33 of the battery or plug socket.

Contact 2 is connected by means of wire 28 to thebinding post 28 of an electromagnet 8. the other binding post 29 of which is connected by aoanus wires 21 and to one pole SI of a biemetallic thermostat II, the other pole 28 of which is connected by wires 24 and 21 to pole 23 of the battery or plug socket. A spring contact I! on the thermostat It is normally held spaced from a contact piece ll of the same near'the pole II thereof.

' The electromagnet 6 is arranged partly in valve casing 48 and partly in the movable metallic body 10 of valve 8, and a spring in rests at one end against Y the end of body 8 and at its other end against a lock nut Ii in casing 48 and is wound about electromagnet 8 although spaced therefrom.

A look nut I on the screw 8 holds the electro- 5 magnet I in place while the movement of body it is cushioned by means of a spring 2| in body II, between the core end is of the electromagnet and the end wall of the body 8. I

It is the purpose of non-metallic wheel I to avoid permanent closure of the circuit through wires 28, 26' as in such case the circuit|would be interrupted only through an'accidental ex tinction of the flame which would set the thermostat out of commission, while wheel 5 enables an arbitrary shutting oil! of' the gas by interrupting the circuit at will by means of wheel 5.

The device operates as follows: When it is desired to start the stove'or to lgnite any burner thereof, the push button I is 30 pushed inwardly to move lever I against the action of its spring 24, pawl 25 will turn wheel 5 to bring its contact pieces 23, 3| into engagement with spring contacts 3|! and 2| respectively.

. Slmultaneously'shaft lit and wheel 3 thereon 3 will turn to bring its contacts 38, 31 into engagement with spring contacts 22 and 2, and the following circuits will be closed:

The circuit in which the igniter i2 is located,

cross wire 38, contact 2, contact 81, wheel 3, con- 40 tact 3B, spring contact 22, wire 26 to pole 32, battery, pole 22, wire 40 to igniter l2. The igniter is then made to glow to ignite the gas, and the gas flame will cause the operation of the thermostat for closing the thermostat switch. By the closing of the thermostat switch a circuit is closed from pole 35; across wire 43 and wire 21 to pole 29 of the electromagnet, pole 28 of same, wire 26, contact spring 2|, contact 3|, wheel 5, contact 22, contact spring 30, wire 26 to the pole", po

" 22, wire 24 to pole 39 of thermostat.

r The energization of the electromagnet will attract, body 8 to open the gas valve and if now the gas supply is turned on by means of valve I! the igniter will ignite'the same.

If now spring 24 which through the rearward motionof lever I has been tensioned, expands again, lover I will slowly return into its original position on account-of the dash pot arrangement and turn wheel I to bring its contact pieces I8. 31 out of engagement with spring contacts 22 and 2 and open the igniter circuit.

If the gas supply is out of! or the flame of the burner for any reason is extinguished, the thermostat will cool oi! and open the, circuit across the electromagnet and deenergize the same, so that springs Ill and 2| will return valve body 9 into its valve closing position by engagement with nozzle It to prevent the escape of gas.

The cyclus of operations is then repeated by pushing button I inwardly in order to bring contacts 22' and 3|, of wheel 5 and the contacts of wheel 3 again into circuit closing position as aforedescribed.

It will be understood that I have described and shown thepreferred form of my device only as one example of the manypossible ways to practically construct my invention and that I may make such changes in its general arrangement, and in the construction of the, minor details thereof as come within the scope of the appended claims without departure from the spirit of my invention and the principles involved. v Having thus described my invention what I claim as new and desire to secure by Letters Patent is: l

A safety device for gas stoves comprising a gas burner, an electromagnetically controlled cut-oi! valve controlling the supply of gas to said burner, an igniter, a circuit in which said igniter is located, a push button operating a spring controlled lever, contact wheels operated by said lever to close said igniter circuit to glow said igniter. the spring of said lever returning the same into its original position after each operation by said button, for opening the igniter circuit, a thermostat and' a circuit in which said thermostat is located to be closed upon the closure of said igniter circuit to heat the thermostat by the heat developed by the glowing igniter upon the closure of its circuit by said lever'operated contact wheels, an electromagnet in said thermostat circuit to be energized upon the closure of this circuit to open the valve for supplying gas to said burner, and to be de-energized upon the extinguishing of the burner flame and consequent cooling oil of the thermostat, and springs formoving the valve mechanically into its gas supply cutting off posi-' tion.-

WILLY KATZ.

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