US1529194A - Safety appliance for air brakes - Google Patents

Description

March 10, 1925- J. LIDDELL SAFETY APPLIANCE FOR AIR BRAKES Filed July 3, 24 3 Sheets-Sheet 1 5- 1o 11 19 1 1 f k 39 a 3 :I' 3 I I *w'" 29 21 u r 7 (5 22 E 1 2:6 Q

Joe L :Lddell.

Watch 10, 1925- J. LIDDELL v SAFETY APPLIANCE FOR AIR BRAKES 3 Sheets-Sheet 2 I I I, z I. I T

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Filed July 5, 1924 gwuwnku zloe Liddell.

J. LIDDELL SAFETY APPLIANCE FOR AIR BRAKES Filed July 5, 1924 I5 Sheets-Sheet 3 attain Patented Mar. 10, 1925.

UNITED STATES JOE LIDDELL, OF NEW ALBANY, MISSISSIPPI.

SAFETY APPLIANCE FOR AIR, BRAKES.

Application filed July 3, 1924. Serial No. 724,154.

To all whom it may concern:

Be it known that I, J or. LIDDELL, a citizen of the United States, residing at New Albany, in the county of Union and State of Mississip i, have invented certain new and useful improvements in Safety Appliances for Air Brakes, of which the following is a specification.

My invention relates to a safety appliance adapted to be attached to air brakes on railroad cars for the purpose of automatically stopping a train whenever a brake beam falls down.

It is a well known fact that a great number of railroad accidents are caused by de fective brakes, such accidents amounting to as much as sixt percent of the total number of all acci ents and it is accordingly very important for the railroads, as well as the traveling public, that the causes of accidents be removed as much as possible.

In the accompanying drawings, one embodiment of the invention is illustrated, and- Figure 1 is a fragmentary assembled View of the device as connected to the air brake valve;

Figure 2 is an axial section through the valve cage and adjacent parts;

Figure 3 is a section along line 33 of Figure 1;

Figure 4 is a section along line 44 of Figure 1,

Figure 5 is a section along line 5-5 of Figure 1, and

Fig. 6 is a fragmentary side elevation of a car with the safety device installed.

In the drawings, reference numeral 10 represents a valve cage which is of the usual construction and inserted in the pipe line 11. The cage has a main chamber 12 and a relief chamber 13 divided by a partition 14. In this partition is provided an aperture 15 forming a seat for a valve 16 adapted to close by gravity and mounted on a valve stem 17 guided in a boss 18 at one end and in a closing plug 19 at the other end. From the relief chamber 13 a small vent 20 opens into the atmosphere for the escape of air from the valve cage.

The boss 18 has a downward extension 21 forming a guide for a toe 22 on an operating lever or tri ger 23. The toe 22 is pressed downward y by a compression spring 39 abutting at its upper end against the outer wall of the cage and at its lower end against the top face of the said toe. The latter rests, actuated by the spring, on a stop 41 at the bottom of the guide 21. The said guide forms a protective housing both for the lower end of the stem 17 and for the toe 22. The lower end of the valve stem 17 extends into the recess 24 in said guide in close proximity to the toe 22 but normally free from the same.

The trigger 23 is fulcrumed, as at 25, on a journal 26 carried in bearings 27 forming part of the valve cage 10 and a long arm 28 of the trigger terminates with an eye 29 from which a rod 30 is suspended upon a pivot pin 31. The rod 30 is provided with a plurality of apertures 32 with which the pivot pin 31 may selectively engage. This is for the purpose of adjusting the distance of the horizontal safety bar 33 below the brake beams. The safety bar is suspended from the rod 30 by means of a chain 34 and a link 35, the latter having pivotal engagement, as at 36, near one end of the safety bar 33. The link 35 is preferably of square or rectangular cross section and is guided in a brace 37 for the purpose of preventing twisting or displacement of the horizontal safety bar 33.

At 38 is shown a fixed stop under the bottom of the car and adapted to limit the swinging movement of the trigger 23 when the latter is actuated by the rocking of the safety bar 33.

Reference numeral 40 represents a brace for the chain 34 which brace is bolted to the sand bolster 45 of the car so that the safety bar will be properly located with relation to the brake beams.

The operation of the device is as follows:

With the safety appliance installed, as indicated in Figures 1 and 6, on a car truth and attachedto the air pipe line 11. the

safety bar extends lengthways under the truck beyond the front and rear brake beams 46 and 47 slightly below the same. In case one or both of the latter should be detached and dropped down it will fall on the safety bar 33 and its weight will press the safety bar downwardly. This action is communicated through the link 35, chain 34 and rod 30 to the long arm 28 of the trigger 23. The latter will then turn against the action of the spring 39, thereby swinging the trigger toe 22 upwardly and lifting the stem 17 with the valve 16. This swinging movement of the trigger 23 is limited by the stop 33 so that the spring 31' tannot be min pressed more than to a certain extent but sutli iently to permit the liftlngof th'e'valve 1 As commnnication is now o ten between the main chamber 12 and the-"tenet chamber 1 in the "age 10. the compressed air ip the pipe line 11 Wlll escape through the valve seat 15 int the relief chamber 13 and from there to the atirnasphere through the .vent 20. The air brakes will accordingly be applied in the usual manner and the train stopped. The escape of air will continue as long as the safety bar is loaded that is to say, until the fallen brak beam is removed. As soon as the Weight is talzenoff the safety bar 3 the springfit will press: down the trigger toe J2 and lift the safety bar 333 into its normal position. At the same time the valve 16 will. .l,rop baclt into its seat 15 partly actuated by gravity and partly by pressure in the main chamber 12. the lower end of the stem 17 having been released by the toe 32.

Having thus descrilj-ed the invention. What is claimed as new is:

1. A safety appliance for cooperating with the bralte beam of an air brake; said appliancecomprising a valve cage insert d ill the air pipe line. a alve seat in said cage connecting said pipe line with the atmosphere. a valve normally t losing said seat. a trigger, a safety bar [MSl iOnQd beneath said bralce beann and suspension means for saidsafety bar connectedwith said trigger.

2. Asafety appliance for cooperating with the brake beam of an air bralie; said appliance c mpr'ising a valve cage inserted in the air pipe line. a alve seat in said cage connectingsaid pipe line with the atmosphere. a valve normally closing saidseat, a trigger. a safety" bar positi ned beneath said brake beam, and suspension means for saldsafety bar connected with said trigger; saidhneans including a spring tending to hold said trigger out of engagement with said valve.

3. Asafety appliance for cooperating with the brake beam of an air bralze; said appliance comprising a valve cage inserted in the air pipe line. a valve Seat in said cag connecting said pipe line ,With the atmosphere. a valve normally closing said seat. a trigger, a safety bar positioned beneath said brake beam. and suspension means for said saf ty bar eonnected with said trigg r. said trigger being pivoted on said cage and provided with d toe and an arm. said t e being situated in the path of recipnnlation of said valve.

4. A safety appliance for cooperating with the brake beam of an .air brake: said y applian e comprising a'valve cage inserted in the air pipe line, a valve seat in said cage onnecting said pipe line with the atmosphere, a valve normally closing said seat, a

triggeif a Saf ty ba r poSlfiblle jl beneath Said bralte beann and r-ruspension means f r said Safety bar Cmlllected With said trigger, said trigger being pi 'd d H t llltl 'flg find l' l'O- id ilwi h 1; t e and an arm, said t being situated in the path of 1e 'ipi "?:1ti 1i f said valvt'gflsaid means includin a sprrn; tending t hold said toe out of engz emeirt With said valve.

5. A safety appliance for operating with the braltelaearn of an arr brake; said appliance conrprising a valve cage inserted ill the Si) pipe line, :1 valve t 'fllt ln said cage .onne1 -t3ing said p pe lipe'tvith the 'atnwsphere. a valve iwrmally closing saidseat,a trigger. a safety bar positioned beneath said brake beam. and suspension means for said safety bar connected with said trigger; said trigger being pivoted n said'eage and provided with a t eand an arm said toe being situated in the path f reciprocation of said valve: saidmeans incl'udir'rg a spring tending tohcfld'said toe out'of g'ementXvith said Valve and a rod having :rdjustalde. pivotal engagement with said arn't of the trigger.

0. A safety appliance for cooperating with the brake beam of an air braltei said appliance comprising a valve cage inserted in the air pipe line. a valve seat in said'cage onnecting said pipe line with the atmosphere. a valvenorngally closing said seat. a trigger. a safety bar positioned beneatl r said brake beann and suspension means for said safetydaar oonnected with said triggern said trigger being p ivoted oirsaid cage and provided witha toe and an armj'said toe being situated in the'path of reciprocation "of' said valve: said means including a springtending to hold said toe out of engageinent with said valve, a rod ha ing adjustable, pi otal engagement with said arm of the trigger, a

linl: 1Iulcrumed n said safety bar. and a pliabe member connecting said lrnl: and saidrod.

4 7. A safety appliance tor cooperating with the brake beam of an arr brake: said lot appliance comprising a valve cage inserted in the air pipe line. a valve seat in said cage connecting said pipe line with the atn'msphere'. a valve normally closing said seat a trigger, a safety bar positioned beneath said ,bralce beam; and suspension means for said safety bar mnnected with said trigger. said trigger being piv t dorrsaid c ;n*e'and provided With (l b "f and an anti. said toe being situated in the path freciprocation of said valve; said means including a spring tending to hold said toe-out of engagement \vitli siliil Valve :1 l til having :H'ljlif talrlQ. pivotal ngageme t with said arni of the trigger. alinl; ful runted on'said safety ban and a pliable nreillljwr connectingsaid linlt arid said rod; an ab'utinent 'on Sttid' cage adapted to limit the swinging movement of lit llO

said trigger in one direction, and a stop fix edly arranged to limit the swinging movement of the trigger in the opposite direction.

8. A safety appliance for cooperation with the brake beam of an air brake, said appliance including a normally closed valve inserted in the air pipe line, said valve when open serving to connect the air pipe line with the atmosphere, a valve unseating member, an impact receiving member positioned beneath the brake beam, and suspension means for said impact receiving mem ber operatively connected with the Valve unseatinp; member.

In testimony whereof I affix my signature.

JOE LIDDELL. [L. s]

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