US1219627A

US1219627A - Automatic gas cut-off.

Info

Publication number: US1219627A
Authority: US
Inventors: George L Coffman
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-03-30
Filing date: 1916-03-30
Publication date: 1917-03-20
Anticipated expiration: 1934-03-20

Description

G. L. COFFMAN.

AUTOMATIC GAS CUT-OFF.

APPLICATION FILED MAR. 30, I916.

Patented Mar. 20, 1917 2 SHEETSSHEET 1- I I l 21 II I I 'HI l 1 9 l In 1.1 9 5;:

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G. L. COFFMAN.

AUTOMATIC GAS CUT-OFF.

APPLICATION FILED MAR. 30. 1916.

1,21 9,627. Patented Mar. 20, 191?.

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GEORGE L. COFFIVEAN, OF OKLAHOMA, OKLAHOMA.

AUTOMATIC GAS CUT-OFF.

7 Specification of Letters Patent.

Patented Mar. 20, 1917.

Application filed March 30, 1916. Serial No. 87,690.

To all whom it may concern:

Be it known that I, Gnonen L. COFFMAN, a citizen of the United States, residing at Oklahoma city, in the county of Oklahoma and State of Oklahoma, have invented certain new and useful Improvements in Automatic Gas Out-Offs, of which the following is a specification, reference being had to the accompanying drawings.

The invention pertains to a device for antomatically shutting off the supply of gas when the pressure becomes too low, an object being to provide a device of this class extremely sensitive to reductions in pressure and positive and certain in its action.

Other objects and advantages of the invention will be set forth 'in the ensuing description.

The drawings show one embodiment of the invention in practical form.

Figure 1 is an elevation view .of the device, showing the position of the parts after the pressure of the gas supply has dropped and the supply has been cut off.

Fig. 2 is a sectional view in the same direction as Fig. 1, but showing the position of the parts when the gassupply is under normal pressure and is passing through the device.

Like characters of reference designate like parts in both the figures.

The device includes a vertical cylindrical body 5 which is closed at its upper and lower ends and adapted to support other parts.

A valved inlet port 6 enters one side of the lower end of the body 5, and a pipe 7 leads from said port up the axial center of said body to the upper end wall 8 thereof; the lower end of the body being also provided with an outlet port 9.

In installing the device for use, the gas supply pipe 10 is connected to the inlet port 6, and an outlet pipe 11 leads from the port 9 to a burner or other point of consumption, not shown.

In passing through the device, the gas from the pipe 10 is forced up the inner pipe 7; out of said inner pipe 7 through holes 12 in its upper end and into the space 13 surrounding said pipe; and thence out through the outlet port 9 and pipe 11.

An upward extension 14 is screwthreaded to the body 5 with a gas-tight fit, and the upper end wall of this extension is formed by a flexible diaphragm 15, a protecting cap 16 being provided for this diaphragm and screwthreaded to said extension.

One or more small branch tubes 17, permanently open, lead away from the bore of the inner pipe 7 at a point below the holes 12 and upward through the upper wall 8 of the body 5 into the compartment 18 under the diaphragm 15, said tubes 17 pipe 7, and upper wall 8 preferably being integral in order to be gas-tight.

The inlet port 6 is provided with a cutoff valve 19, preferably of the sliding-gate type shown, whose stem 20 projects upward and is PlfOVlflQd with a weight 21 for closing it.

The upper end of this stem 20 passes slidably through a hole 22 in the horizontal portion 23 of a supporting arm 24 which is secured to the side of the body 5, and this stem is provided with a notch 25 which may be hooked into engagement with said arm at said hole to hold the valve 19 open.

On the side of the stem 20 adjacent the body 5, a small standard 26 is mounted on the arm 24, the upper end of this standard having a T head 2!.

This head 27 houses and guides one end of a bar 28 which passes slidably through a diametric slot 29 in the stem 20 and through a similar slot 30 in a standard 31 mounted on the outer end of the arm 24.

The bar 28 is provided on. one side of the stem 20 with a shoulder and on the other side with a pin 33, so as to have only a vertical sliding movement on said stem; and the housing 27 contains a spring 341 which acts on said bar in a direction to cause it to unhook said stem from engagement with the supporting arm 24: and allow the valve 19 to be closed by the weight 21.

To hold the stem 20 positively hooked and the valve 19 open, the outer end of the bar 28 is provided with a hook 35 which may be hooked over a pin 36 in the outer standard 31.

In further arrangement, a lever 37 is fulcrumed in the upper end of the outer stand ard 31, this lever also passing through the diametric slot 29 of the stem 20 as a con-- venient construction for holding associated parts alined on the same plane.

The outer end of this lever 37 is connected operatively to the outer end of the bar 28 by a link 38, and the inner end of said lever to the center of the diaphragm 15 by a rod 39 which passes loosely through the cap 16.

To set the device to allow a flow of gas, the stem 20 is lifted manually by its handheld 40 to open the valve 19, and then swung outward in opposition to the spring 34: to have its notch 25 hook onto the arm 2% and hold the valve open.

Then, the gas which is entering the open valve 19 and port (3 sets up pressure under the diaphragm 15 through the tubes 17, the diaphragm raising up the inner end of the lever 37 and causing the outer end of said lever to swing the outer end of the bar 28 down into hooked engagement with the pin 36.

As long as the gas is under sullicient pres sure to support the diaphragm 15 and attached parts, the bar 28 will be held down in hooked engagement with the pin 36 and the spring 34: will thereby be prevented from tripping the notch ot' the stem 20 out of engagement with the supporting arm 24; but when a reduction in gas pressure allows the diaphragm and the inner end of the lever 37 to fall the bar 29 will be'tripped from engagement with the pin 36 and allow the spring 34L to trip the stem 20, the weight 21 instantly closing the valve 19.

In order to insure suliicient back pressure in the compartment 18 to support the diaphragm 15 when a burner or other termination of the outlet pipe 11 releases too much gas, a small float 11 fits the upper end of the inner pipe 7 as a piston.

When no gas is forced into or through the device, this float 4L1 rests on shoulders 42 in the pipe 7.

The gas must raise and support the float 41 in order to pass through the holes 12, and the back pressure thus set up is communicated through the tubes 17 to the diaphragm compartment 18.

For convenience in construction and in assembling the float -11, the pipe 7 opens upward through the upper wall 8 and is closed by a removable plate 4L8 and gasket 14 which are held to said wall by screws 45.

Having thus described the invention, I claim:

1. An automatic gas cut-off, including a closed casing having an inlet port and an outlet port, a pipe extension leading from the inlet port and extending into the casing, a lateral outlet hole being provided in the said pipe extension, a float slidable in the pipe extension and normally held away from the outlet hole therein by the pressure with in the casing, a valve in the inlet port of the casing, means for closing the valve, and means whereby pressure within the casing holds the valve open.

2. In a device of the class described, an inclosed casing having an inlet port and an outlet port, a pipe extension leading from the inlet port upward in the casing and having an outlet hole in its upper end, a float fitting in th upper end of said pipe extension, a support for the float in said pipe extension and below the said outlet hole, a diaphragm compartment having one of its walls composed of a flexible diaphragm, said compartment being in communication with that portion of the pipe extension below said outlet hole, a valve in the inlet port of the casing, and means whereby pressure on the diaphragm holds the valve open.

3. in a device of the class described, a closed casing having an inlet port and an outlet port, a pipe extension leading from the inlet port upward in the casing and having an outlet hole in its upper end in comnninieatimi with the outlet port, a float fit ting in the upper end of said pipe extension, a support for the float in the pipe extension and below said outlet hole, an upward eX- tension screwthreaded to the casing and forming a diaphragm compartment, a tube leading from the pipe extension at a point below the support of the float and upward through the upper wall of the casing into the diaphragm compartment, a diaphragm forming one wall of the diaphragm compartment, a valve in the inlet port of the easing, and means whereby internal pressure on said diaphragm holds said valve open.

4:. An automatic gas cut-ofi including a closed casing having an inlet port and an outlet port, a pipe extension leading from the inlet port and projecting into the casin a lateral outlet hole being provided in the pipe extension, a float slidable within the pipe extension and adapted to close the outlet hole, but normally held away therefrom by the pressure within the casing, a diaphragm compartment having a diaphragm for one wall thereof, a tube leading from the pipe extension to the diaphragm compartment, a valve for the inlet port of the casing, and means whereby internal pres sure on said diaphragm holds said valve open.

5. An automatic gas cut-off, including a closed casing having an inlet port and an outlet port, a diaphragm compartment in communication with the chamber, a diaphragm forming one Wall of the said compartment, a valve for the inlet port of the casing, a slidably mounted stem operatively connected to the valve and controlling the opening and closing thereof, said stem having a notch in one side thereof, a guide member for the stem adapted to be engaged by the notch to hold the valve in an open position, a spring actuated slide for moving the stem laterally to disengage the notch from the guide member, means for holding the slide in inoperative position, and means actuated by the before mentioned diaphragm for releasing the slide when the pressure Within the casing falls below a predetermined point.

6. In a device of the class described, a closed casing having an inlet port and an outlet port, the inlet port having a valve, the valve having a sliding stem projecting upward for opening and closing it, the casing having an arm slidably embracing and guiding the upper end of the stem, the stem having a notch adapted to be hooked into engagement with the arm to hold the valve open, and having a weight to force a movement of the valve when the stem is tripped from engagement with the arm, a springaotuated sliding bar mounted horizontally and arranged to trip the stem from engagement with the arm, a fixed locking stop carried by the arm, the bar having a notch adapted to be engaged With said stop to prevent the bar from tripping the stem, a diaphragm adapted to receive pressure from the casing, and operative connections whereby pressure exerted upon the diaphragm premunication With the casin vents the bar from being released from said stop.

7. An automatic gas cut-ofl', including a casing having an inlet port and an outlet port, a diaphragm compartment in coma diaphragm forming one Wall of the said compartment, a valve for the inlet port, a sliding stem operatively connected to the valve and controlling the opening and closing thereof, said stem having a notch in one side thereof, a guide member adapted to be engaged by the notch to hold the valve in an open position, a spring actuated trip member for disengaging the notch of the stem from the guide member, and means actuated by the before mentioned diaphragm for automatically releasing the said spring actuated trip member when the pressure within the casing falls below a predetermined point.

Witness my hand this day of March,

GEORGE L. COFFMAN.

Copies of this patentmay be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.