US861588A - Automatic fluid-brake. - Google Patents

Description

No'. 861,588. PATENTED JULY so, 1907.

T; GUNDERSON.

AUTOMATIC FLUID BRAKE.

APPLIUATION FILED JAN. 21, 1907.

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AUTOMATIC FLUID BRAKE. APPLIOATIOK I'ILED IAN: 21, 1907.

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PATENTED JULY 30, 1907.

T. GUNDERSON. 7 AUTOMATIC FLUID BRAKE.

AEPLIUATION FILED JAN. Ql 1907.

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UNITED STATES OFFICE.

THOMAS GUNDERSON, OF MCINTOSH, MINNESOTA, ASSIGNOR OF ONE-HALF TO HERMAN HELGESON, OF MCINTOSH, MINNESOTA.

AUTOMATIC FLUID-BRAKE.

Specification of Letters Patent.

Patented July so, 1907.

Application filed January 21, 1907. Serial No. 353,268.

To all whom it may concern:

Be it known that I, THOMAS GUNDERSON,2L citizen of the United States, residing at McIntosh, in the county of Polk and State of Minnesota, have invented a new and useful Automatic Fluid-Brake; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to automatic fluid brakes.

The object of this invention is to provide a mechanism which will automatically supply fluid to the ordinary fluid brake cylinder Whenever there is a reduction of pressure in the main pipe, due to the breaking of connection between any two cars.

With this and other objects in view, the invention consists of the parts and the combinations of parts hereinalter described, more particularly pointed out in the appended claims, and shown in the accompanying drawings.

In the drawings, Figure 1, is a bottom plan view of the car with all parts removed except those to which the invention relates. Fig. 2 is an enlarged sectional view of the invention. Fig. 3 is a sectional view of another embodiment of the invention showing the device connected to the usual air tank.

Referring more particularly to the drawings, il indicates the usual main pipe extending longitudinally of the car and provided with the usual flexible couplings 2 at its ends; 2 indicates the usual cylinders and 3 the usual air tanks.

Connected to the brake cylinder 2 by a piping 4 is a second air tank 5 said piping containing a check valve 31 unseating under pressure irom said air tank 5,and also a turning valve 6. Also arranged below the car is a valve-operating cylinder 7 which contains a piston 8 having a piston rod 9 connected by a pin and slot connection 10 with a lever 11. to permit a straight movement of the piston. This lever 11 is pivoted near its opposite end and is provided at this latter end with a toothed sector 12 which meshes with a pinion 13 on the stem of the valve (3. When the piston is in the position shown in full lines, the valve 6 is open, and when in the position shown in dotted lines, the valve is closed.

To move the piston to close the valve 6, the cylinder 7 is connected to the main pipe 1 by a short connection 14 which delivers to the cylinder, the fluid compressed in the usual manner and supplied to main pipe 1. the fluid enters the cylinder 7, the piston moves to the position shown in dotted lines, thereby permitting the compressed iluid to escape through passageway 15 at the opposite end of the cylinder to an air reserve tank 16. In passing through passageway 15, the fluid unseats valve 17 which has a stem 18, projecting from opposite faces thereof, and guided in spiders or cross arms 1.9, a spring 20 serving to hold the valve to its seat and prevent back pressure through the passageway 15.

From the air reserve tank 16, the fluid passes through a passageway 21 to the second main air tank 5, said passageway containing a check valve 22 which unseats under pressure from the air reserve tank 16, and which is provided with a stem 23 guided in a spider 24 and pressed to its seat by a spring 25.

As long as pressure is maintained within the main pipe 1 the piston will be maintained in the position shown in dotted lines. To hold the piston in this position and prevent its being moved upon any slight reduction of pressure in the main pipe due to leakage, the cylinder carries a spring latch 26 provided with a notch 27 to engage a projection 28 on the piston rod. 7 0 When, however, the pressure in the main pipe drops, due to the breaking of connection between any two cars, the fluid in reserve tank 16, will pass through passageway 29 into the cylinder 7 and force the piston to the position shown in full lines, the fluid then passing 7 5 through a passageway 30 to connection 14 and thence escaping by way of main pipe 1. To prevent fluid passing through passageway 30 when the main tank 5 is charged, a check valve 32 is provided and has a valve stem, 33 projecting from opposite faces thereof. The stem is guided in cross arms or spiders 34. and the valve is held to its seat by a coil spring 35. As the piston moves to this position, the valve 6 is opened thereby supplying fluid from the second main tank 5 to the brake cylinder which causes the operation of the brakes in any suitable manner. Fluid under pressure is held in the brake cylinder by check valve 31 until the brakes are released, in the usual manner.

In Fig. 3 instead of providing a second air tank 5, the reserve tank 16 is connected to the usual air tank 3 and a connection t leads from this air tank to the brake cylinder 2.

To permit the cars to be switched, each main pipe is provided at each end of a car with a valve 35 which may be operated in any suitable manner such as by 1nanu ally operable means. These valves may be closed before a car is detached and when the car has reached its proper position may be opened, thus causing the brakes to act.

The cylinder 7 may be connected to piping 4 by a brace 36.

Having thus described my invention, what I claim and desire to secure by Letters-Patent is:

1. The combination with a brake cylinder, an air tank and a main pipe. of a connection between the air tank and the brake cylinder, means controlling said connection comprising a cylinder connected to the main pipe, a piston therein and a reserve tank connected to the cylinder, connection between the reserve tank and the air tank, and a chock alvo in tho connool'ion hotweon the air tank and tho rosol'vo tank said chock valvo unsoating to supply tho air tank through tho rosoryo tank.

2. 'lho' combination with a hrako lindor. an air tank. and a main pipo. oi. a oonnoction hotwoon tho air tank and tho bri (o c 'lintlor a. yalvo in said (-'onno(:t,ion. and moans oontirolling id valvo, comprising a cylinder oonnoctod with tho main pipe :1 piston in tho (:ylinrlor, oonnectod to tho valyo and a rosorvo tank roooivingprossuro from tho oylindor whon tho piston is in position to hold tho alvo olosod. having a oonnoction with tho oylindor to move the piston to upon tho valvo. and ha \o. communication with tho air tank. v

Ii. 'iho combination with a brako oylindor. an air tank, and a main pipo, ot a onnootion botwoon tho air tank and tho brako oytindor a valyo oontrolli ng said connootion and moans oontrolling: said valyo Comprising: a piston. a connootion botwoon tho oylindor and tho main pipo. a rosoryo tank. oonnootion botwoon tho oylindor and tho rosorvo tank wlton tho pi ton is in position to hold tho val yo closod. and oonnootion bottwoon tho cylindor and tho rosorvo tank to (ftlllSt tho piston to ho movod to opon the valve when tho prossuro is rodutrod in tho main pipo.

4. Tho combination with a brake (:ylindor. an air tank. and a main pipo. of a connoction hotwoon tho air tank and tho hrako cylin'dor. a UV? in said ('onnootion. a rosorvo tank supplying prossttro in such niannor as to oatiso tho opening ot? tho valvo whon prossnro is roduood in tho main pipo. a connootion hotwoon tho air tank and tho rosorro tank by which tho air tank is suppliod through tho i'osolyttank and a ohock valyo in said ('onnootion. unsoatina to admit air t'rmn tho rosorvo tank to tho air tank.

7. i\ moans for controlling air to brako oylint'iors ooni prising a (:ylindor having a main pipo oonnootion and a yalyod oxhanst; pas goway t'ommunioating with tho main pipo oonnoction, a piston working in tho oylindor and a rosorvo tank having two oonnnunioations with tho oylindor. ono of said oommnnioations with tho oyiindor lltilljl. providod with a ohook valvo.

In tostimony whorooi' l havo signod my namo to this spocilication in tho prosonco of two subscribing witnossos.

1 21am, Iloinmnn.

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