US942601A - Safety gas cut-off. - Google Patents

Description

H. TULLIS.

SAFETY GAS GUT-OFF.

APPLIOATION FILED MAY 19. 1909.

942,601 Patented Dec. 7, 1909.

Ham/y Tu Z Z is @im By wom M ATTORNEYS HARVY TULLIS, 0F LISBON, OHIO.

SAFETY GAS CUT-OFF.

Specification of Letters Patent.

Patented Dee. 7, 1909.

Application led May 19, 1909. Serial No. 496,929.

To all whom tt 'may concern:

Be it known that I, HARVY TULLis, a citizen of the United States, and resident of Lisbon, in the county of Columbiana and State of Ohio, have invented a certain new and useful Safety Gas Gut-Ott, of which the following is a full, clear, and exact description.

lThe object which the present invention has principally in view is to provide a mechanism for cutting off the supply of gas in t-he event of the same being inadvertently or otherwise temporarily suspended.

One embodiment of the invention is disclosed in the structure illustrated in the accompanying drawings wherein like characters ot reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of a gas pipe having attached thereto a cut-off constructed in accordance with the present invention; Fig. 2 is an end elevation of the same; Fig. 3 is a vertical longitudinal` section of the same, showing the valve in its open position; Fig. 4 is a cross section ot the same taken on the line 1 4 in Fig. 3; and Fig. 5 is a vertical longitudinal section of the cutotf, t-he valve being shown in its closed position.

A great deal of disaster and discomfort has been experienced in the past, due to the accidental or intentional suspension of gas service in buildings, and the renewal of the same after the light has become extinguished, due to the suspension. Many cases of asphyxiation have been traced to this cause, as where aY person on retiring has left a gas light burning, which through accidental suspension ol service has become extinguished, as a light, while the pipe remains open to permit the gas to tlow unburned into the chamber when the pressure is again renewed. It is to avoid this action that I have provided the present invention, which consists in interposing between the pipe sections G and 7, a device having a body portion 8, in which is formed a chamber 9, of enlarged area to permit the movement of a valve 10 to and from its seat 11. The valve 10 is tiXedly attached to a valve rod 12, which is guidably supported in a perforation formed in the end of an upright guide rod 13. The guide rod 13 may be substituted by a spider casting suitably secured in the body 8. The rod 12 is supported at the end opposite that which is mounted in the guide 13, by being pivotally connected with a rocking lever 1K1, pivoted in the body portion 8 at 15. The said lever when in the position shown in Fig. 3 of the drawings, holds the valve 10 in the position shown in said view, or raised from the seat 11. hen, however, the lever is moved to the position shown in Fig. 5 of the drawings, the valve 10 is moved against the seat 11. The cut-orf is placed between the pipes 6 and 7 in such manner that the valve 10 is interposed between the source of gas and the seat 11, the gas iiowing in the direction shown by arrows in the drawings. The free end of the lever 14 is connected by means of a connecting rod 16, to a bellshaped member 17, mounted to inclose a small pipe 18, at the top of which there is secured a washer 19, which prevents the escape of gas from the interior of the bellshaped member 17. The bell-shaped member 17 is increased or decreased in weight by the use of rings 2O of various weights, which are screwed upon the lower end of the bell-shaped member 17. The rod 16 is secured to the upper end of the bell-shaped member 17 by a connecting link 21.

Vith a device constructed as shown in the drawings and as herein described the operation is as follows: Then the. device is inserted in the system between the pipes 6 and 7, the pressure of the gas operates to set the valve 10 on the seat 11. When both sections 6 and 7 of the pipe are secured to the device, the bell-shaped member 17 is raised by hand, removing the valve 10 from the seat 11. It is now calculated that the gas pressure which is permitted to enter through the pipe 18 into the upper part of the bell-shaped member 17, will suspend the said bell-shaped member in the position shown in Fig. 3 of the drawings. rFhe member 17 continues to stand in the position shown, until through accident or otherwise the pressure of the gas in the pipes G and 7 falls below that pressure which is suiiicient to sustain the bellshaped member 17. Thenever this happens, the member 17 falls to the position shown in Fig. 5, throwing the lever 1st to the position shown, and closing the valve 10 upon the valve seat 11. These parts are delicate in operation, and care is taken to provide against the corroding or adhesion of the parts, so that the action described is certain and requires little or no force. When the valve 10 is seated, any subsequent renewal or increase of pressure on the service side in the pipes, only operates to more lirmly seat the valve by pressing against the back thereof. This absolutely closes the pipe .against the admission of gas beyond the valve.

rlhe cut-off herein described is usually placed in the pipe system at or near the meter or between the service and the burners.4 `When it is desired to renew the service, it is necessary to manually raise the member 17, thereby removing the valve l0 from its seat and restablishing the pressure throughout the pipes and on both sides of the valve 10.

While I have herein described this system as applicable to what is known as gas lighting, and as more applic-able to municipal systems for the supply of the same, it will be understood that the cut-off is applicable to use in gas supply systems wherein is used gasolene, or privately carbureted gas.

I-Iaving thus described my invention, I

claim as new and desire to secure by Letters Patent:

A safety gas cut-off, comprising a straight pipe section having a valve mounted to operate longitudinally therein, a rocking lever mounted in said section adapted to open and close the said valve, a vertical pipe exten'- sion opening into the said pipe section on the delivery side of the said valve and forming an open communication from said section', an inverted closed end tube guidably mounted on said vertical extension and forming a gas tight sliding*I joint therewith, and a connection between said rock-y

Images