US1057739A - Slack-adjuster. - Google Patents

Description

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I. JGNES.

SLACK ADJUSTEH.

APPLlcA'rloN rum Nov. 2a, 191:.

Patented Apr. 1. 1913.

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UNITED STATES tmirantil OFFICE.

Isaac JoNEs, vor oHEYENNE, WYOMING.

sLAoK-ADJUSTEP..

of the United States. residiugat Cheyenne,

in the county of Laramie and State of l-Yvonnng. have invented 'certain new and usetul Improvements in Slack-Ad]usters;A and 'I do hereby declare. the following to be a full, zleanaiul exact descriptu'in-of the invention, such as lwill enable 'others skilled in t-liepart to which 1tappe'rtalns to make and use the same.

This invention relates to slack adjusters such as are employed in combination with moved to the right in the' drawing.

l through the port l. `the piston 2 and the lend 5 ot the cylinder, 1S

'Huid pressure brakes to -compensate forthe slack produced thewcaring'down of the. brake shoes. v i

The object. o'l" the invention is to'provide such a device of strong durable.'construction-4 all of whose parts'are positiyely actuated to produce adir-ertoverstroke of the push rod to fully apply the brakes..

ln its broad aspectsr` the invention contemplates the provision of means for autoi' brake cylinder,v the. exact. location of which is immaterial to the. invention. lrefelablyr however. it is applied to the under side ,of the car body in the usual ina-nner. 'A piston 2 carrying the usual Vl-"estiughouse' piston sleeve 2 is :nrtuatcd by admitting and' exhausting the fluid medium to the, cylinder l'nterposcd between" the usual release .spring t5.

'l`elescoping in the piston sleeve. 3 is the p'ushrod 7 carrying at its outerfeud a guide block S which is adapted to abut the end of the brake lever t) when vthe push rod is The end of the brake lever tl is longitudinally movable in the block 5 and a brake chain rod v10 is linked to the'said end of' the brake lever t) by u'ieans of coimec'tions l1`- 12, 13v that thabim lever can be actuated rndeligient ot' the. push rod connect-lons.

Specication of Letters Patent.

'positions of the rollers.

.fications ca n be made in lthe constructi Patent-ed Afp'rn, 1913.

Alipucatioa med Nvfember 25, 1912. serial no. 733,358.

The parts so. farv as described form-,the usual construction ofA braking mechanism.

Carried by Athe pi'stonsleeve` 3 'are suitable lugs 25 to which the links 14 oa setof tog; gies 1.4, Y1 5 are printed.' The coperatin links 15 arepivoted tothe push rod block preferably at the bint-s marked 16.-' ,.-The

lcooperating link s o each toggle .are pivoted -toge'thersuch-as indicated at 17. v Y

" vSecured'px-.eferabl'y to atransveifse of the car body is a bracket 19' embracingjtho carsill and rigidly connected to 'saidlbradket rollers 21. The strap is provided.W-1th,-,aA

series of holes 22,' in any two .of Wihihth pint-les, 23 of vthe rollers 21 can be placed,.-

thereby providing means .for adjusting .the The toggle links 15 arprovided roller enga ing cam surfaees245 preferably shaped as s own in the drawing'.

The operation of the apparatus `1s as fol- Vl'o\vs':.l/Yhen a new brake shoe is installed,

thelrfollers 2 1 are' adjusted so that when Athe brakes are fully applied.y the toggle links'15 wlll just come into engagement- `Withdthe tained therefore `Within the normal stroke ofthe piston sleeve 3 and the push rod .'1 which latter obviously moves the same is a strap 20 carrying the vtoggle'eng-agi'ng rollers, The full brakingr action 'can be o5'- an'iount as the piston under ordinary conditions.v lWhen the brake shoes -\vear, however. the stroke of the piston will be -insu f.

ficientto fully apply the brakes. Due: to thefact that vthe piston and push rod must travel va greaterv distance than Wasnecessary whenjthe brake shoes were newly ad .justeL thetoggle-links 15 vvill be forced 'longitudiinilly between the rollers 21 which act o'n the cam surfaces 24 of said links 'to make. or straighten t-he'toggles 14,- 15,

thereby forcing the push rod outwardly an:

auxiliary amount. The said push rod will As the bra-ke shoes wearthe push rod' .Will

`therefore travel farther t-han the piston-fv always be actuated an amount commensurate. with such wear so that 'the brakesmayl at all times be fully applied irrespective of the size of the brakeshoes A simple mechanism is therefore 'provided which is actuated in a positive manner to' fully oompensate for the slack produced by the 'diminution irnthe size ofthe brake shoes'.

lt is obv'ious that manyl changes and m disclosed herein ,Without departing from the spirit or sbope of the invention as defined in the appended claims. l

What I claim is:- 1

1. In a fluid pressure brake apparatus, thel combination with the brake cylinder, piston rod and telescopic push rod, of to gle levers interposed between said piston ro and push rod, and stationary means-to 'engage said toggles to straighten 'the saine, thereby lengthening the stroke of said jpush rod.

2. In a fluid pressure brake apparatus, the lcombination witlrthe brake cylinder, piston rod and 'push rod, of connections between said piston rod and push rod and stationary means to engagesaid connections during the movement ofjthe piston rod' to move said push rod-an. auxiliaryv amount. l

3. In artluid pressure brake apparatus, the combination with the' brake cylinder, piston rod and `telescopic push rod, of toggle levers interposed between'said piston' rod and push rod, androllers adapted to` engage said togpler `levers to straightenthe same,` thereby engthening the strokeof said -push rod.

i 4. In a Huid pressure brake apparatus, the combination with the brake cylinder, pistonl rod and telescopic push rod, ofconnections between said piston rod and-push rod, and rollers toeneage said connections during the movement of the piston to move said push rod an auxiliary amount. Y I

5. Ina. fluid pressure brake apparatus, the-.combination with the brake cylinder,

piston rod and telescopic push rod, of. connections interposed between said piston rod and push rod, said-conneotionsbeing nor` mally idle for predetermined strokes of the piston, and means adapted to 'act on said connections to move said push rod farther than the piston when the strokesof the pisstraighten the toggle and move the p ush rod an auxiliary amount when the'stroke of vthe piston exoeeds a. predetermined amount.

`7. In a slack adjusting mechanism for fiuid pressure brakes,`the combination with a cylinder, piston rod and push rod, of pivoted levers interposed lbetween said piston rod and push rod, and means operative when the brake .shoe wears land the movement of the piston exceeds. the normal brake applying stroke to actirate said levers 'to vmove the push rod an auxiliary amount and lthereby thoroughly apply the brakes.

In testimony whereof I afiix my signature, in presence of ytwo witnesses.

` ISAAC JONES. Witnesses:

JOHN D. CLARK, i BERTHA MA'rHsoN.

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