US1575710A - Hand brake for railway cars - Google Patents

Description

March 9 1926.

J. F. OCONNOR 'HAND BRAKE FOR RAILWAY GARS Filed April 5, 1924 Patented Mar.y 9, 1926.

vUNITED STATES lPATENT GFFICE.

JOHN r. ooonnon, or CHICAGO, ILLINOIS, assrsnon, BY'MnsNn AssrofNMnNrs, rro

W. n. Minen, rnc., A CORPORATION on DELAWARE.

HAND BRAKE FOR-RAILWAY CARS.

Application filed April 3,

To all whom it may concern:

Be it known that I, JOI-IN F. OCONNOR, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and use'lul Improvement in Hand Brakes for Railway Cars, ot' which the following is a full, clear, concise, and exact description, reference being hadto the accompanying drawings, forming a part of this specilication.

This invention relates to improvements in hand brakes for railway cars.

In the operation of hand brakes of the vertical stattl type for railway cars, diticulty has been experienced heretofore due to the binding of the staff ywhen released.l Binding of the staff is frequently caused by the bulging of the end wall of the car or by bending of the Staff, with the result that even though the brake is released in the usual manner, the chainl will not become fully slack, thereby permitting the brake shoes to remain in contact with the wheels.

One Object of my invention is to provideJ an arrangement especially adapted for hand. brakes of railway cars, wherein provision is made for positively insuring the tull and complete release of the hand brak-e mechanisin, to the end that the brake shoes may be freely disengaged from the wheelsfto minimize wear therebetween and reducel the tractive eiiort required of the locomotive.

Other objects and advantagesot my invention will more clearly appear from the description and claims hereinafter follow-V ing.

In the drawing forming a part of this specification, Figure 1 is a vertical sectional view taken through the end wall oi' the car and showing my improvements in connection therewith. sectional view of the structure lillustrated in Figure 1 and corresponding to thel section line 2--2 thereof. Figure 3 a plan view of the Aclutch face of the slidablc clutch member. Figure 4 is a -fragmentary vertical sectional view oit a modiied form of device. And Figure 5 is a horizontal sectional view taken substantially on the line 5-5 of Figure 4.

In said drawing, the end wall of the car is indicated at 10, and a housing or bearing bracket designated generally by the reference charactre. is secured thereto;v Said .handle or lever 27.

Figure 2 is a horizontal 1924. Serial No. 703,903.l

bracket is provided with a rear wall 11 riveted or otherwise rigidly secured to the car wall 10 by means of rivets 12, said bracket also having a bottom web or wall 13 extending horizontally and provided with a `journal bearing 14, an intermediate web or partition 15 extending horizontally', above the web 13, and vertical flanges 16 and 17 connected toward their front end by a rounded portion 18. A cap or cover plate 19 is also employed and is preferably secured to the main portion of the bracket casting A by the kbolt 34, hereinafter referred to. i

A portion Ot the usual vertical brake stall is indicated at 20, the same being squared or ot' other non-circular cross section at the a ratchet wheel B. The ratchet wheel B is provided with an upper and a lower set of ratchet teeth 21 and 22, respectively, the lower and upper ends of the ratchet being provided with journals 23 and 24, respectively, the lower journal rotating in the bearing 14.

Y Oscillatably mounted on the journal bearing 24 is a carrier or fulcrum member designated generally by the reference character C. Said carrier C has a substantially annular depending flange. 24 ronrwhich. are .extended lateral wings 25-25. Pivotally mounted between thefwings 25 on a horizontal pivot bolt 26 is an operating The handle 27 is provided at the top end thereof with av longitudinally extending socket 28, within. which is slidably mounted a pawl 29 normally impelled outwardly by meansfot' a spring 30. The arrangement of the handle and pawl isL such lthat when the handle is elevated to a horizontal position, the pawl is operatively engaged with the teeth 21. of the ratchet wheel B and when the handle is released, it automatically falls to avdepending vertical, inoperative position as shown in Figure l. With this arrangement, it is evident that the statt may be rotatedV in aV winding direction witha step by stepmovement in fthe usual manner.

To holdv the stall, against accidental reverse rotation, I preferably employ the :tollowing means: A dog 31 is oscillatably mounted between the' webs 13 and 15 so as to coactjvith the teeth. of the ratcliet wheel IB@ This .flog has' teeth at its' top thereof and yon which is rigidly/fitted late in unison.

to coaetwvitlrthev ratchet teeth andis provided with a handle or lever extension 33 at its other end whereby the toothV 32 may-be manually ldisengaged `from the ratchetl wheel. A. vertically extending bolt 34ris positioned through the bracket, and a bushing or sleeve 35 is mounted on said bolt, Asaid bushing having its exterior of square or other non-circular cross section and yfitting into a cooperating recess in the dog 31, so that the sleeve and dog will rotate or oscil- The upper portion of the sleeve 35 is provided with an enlarged por tion having clutch teeth 36 on its upper tace, said enlarged portion resting on the upper surface of the web 15 oit the bracket. A clutch member 37 is arranged to slide vertically uponthe bolt 34., said member having clutch teeth 3S at its lower end, adapted to coact with the clutch teeth 36 ot the sleeve member and is also provided vwith a non-circular portion at its upper end,I the latter portion being slidable vertically7 but non-rotatable in a cooperating guide Zl() formed integral ,with the bracket as shon'n.

.A spring t1. normally7 presses the clutch member 3T downwardly/,and a spring 1211ermally .presses the tooth 32 of the dog into engagement with the ratchet teeth22 ot the ratchet Wheel. A cam 13' is carried by the depending wall 211 of the carrier member so as to proyectradially therefrom, said cam "beingengageable with the portion 39- of the clutch member 37 to lift the clutch member 37 from the'clntehteeth 36 ot" the sleeve when the carrier member is oscillated to- Ward itsstarting `position for Winding the chain.

A[Theoperation of the hand brake is asl tollows: Assumingfthattheparts are in their.I

operative position shown in Figures 1 and 2, With the clutch-teeth 33 ridingvon the liat faces ot the'clutch teeth 36*7 then when the ratchet Wheel isadvanced' in -astep by step movement, lthe 'tooth 32v being spring-finlluenced by the spring A412, Will permit this step by'st'ep rmovement of the ratchet Wheel and holdvsaid ratchet Wheel against-reverse rotation. WlVhenit is desired to release the :dog Afrom its`^holding engagement with the ratchet Wheel, -thereleaselever 33 is pulled, thereby"disengaging theftooth 32 `from the ratchet wheel `andoscillating the sleeve in unison with the idog, whereupon the spring 41 will cause-thelclutch 37 to `move downwardly so thatits clutch teeth'38 mesh Vwith the' clutch.l teeth- 36 land= hold -the dog brakechain occurs, to permit the brake shoes to become fully disengaged from the wheels and t-he brake chain to be fully slack.

lV hen the brakeis later apglied to again Wind the cli-ain, the brakeman elevates the handle 27 and pushes or oscillates thc same to its extreme starting position, thereby oscillating the fulcrum member or carrier C therewith, to cause the cam member 43 carried thereby to engage the portion 39 ot the clutch member 37, lifting the clutch teeth 38 out of mesh with the teeth ot the sleeve 35, thereby permitting the spring 12 to exert its influence to press the tooth 32 ot the dog into engagementwith the teeth 22 ot the ratchet -wheel B, thus restoring the locking' dog and associated parts to their normal op-- erative position. ln this tonnecton, it will be understood that the area et contact ot the flat portions ot the clutch teeth 36 and 3 is of suliicient extent, when the parts are in normal operating position Vto prevent the clutch teeth 3S from falling into engagement with the teeth 33 vvhile the dog 31 ratchcts over the teeth of the ratchet wheel l.

In the term shown in Figures Ll and A indicates the bracket, B the ratchet wheel, and C the 'tulcrum member or carrier member for the operating handle. The

holding dog` 131 is pivotally mounted upon the vertical bolt 134 carried by the bracket A, the inner end 'of vthe holding dog being provided With a tooth 132 adapted to coact with the teeth et the ratchet Wheel B. The release handle 133 is connected to the holding dog'131 so that when the release handle is pulled, the tooth of the dog Will be disengaged fromthe ratchet teeth. Clutch teeth 136 are provided on the upper face ol the hub ottheholding'dog,rsaid dog being tree torotate upon thebolt 134 as shown. Nash^- ers 141-5 maybe interposed between the hub ol' the dogand thebottom ot the bracket, il: desired, ysaid Washers being mounted upon the bolt 131. `A. clutch member 137 is non-rotatably but verticallyslidably mounted upon the bolt 1311-, the bracket A being provided with a guide 140 to prevent rot-ation oli the clutch member 137 but permit the vertical sliding thereof. A spring 1111 may be interposed between the top of the bracket and the clutch 137 to yieldinglyy press the same don'nn'ztrdly, said clutch having clutch teeth 133 on its lower face, adapted to mesh and coact vvith the cooperating clutch. teeth 136 o1" the dog. In this modllication, the spring `corresponding to the spring- 42 ot the previous vmodilication is unnecessary as the shape of the clutch teeth 138 and 136 is such as to 'exert a camming action and the dog` is normally urged into engagement vvith the teeth of the ratchetwvheel B. 'lhe ratchet Wheel may be rotated in a step by step movement and as the'tooth 132 is moved outwardly'by the'ratchet Wheel B a distance Elli 141 to permit otl this stepby step movement.

Then it is desired to release the dog from its holding engagement with the vratchet vwheel, the' release `handle 133 is pulled,

thereby camming the clutch member 137 upwardly so that its clutch teeth ride on the top faces of the clutch teeth 136 and frictionally hold the dog against reengagement with theteeth ot the ratchet wheel B.

A lng or projection 144 is carried by the clutch portion 136 of the dog,'as shown in Figures 4 and A5 and a` portion of the periphery of the carrier member C is recessed or cut back to form a groove 142, the ends of the cut back portions forming shoulders 146. When the release handle 133 is pulled to release the tooth 132 of the dog from the ratchet wheel B', the projection 144 carried by the dog will remain in the position shown in dotted lines in Figure 5, while the dog is being held in released position. Then it is desired to wind t'he brake stati;l again, the operating handle is litted to its operative position and is then swung to one extreme position, causing the carrier mem` ber C to oscillate, during which oscillation the shoulder 146 engages with theprojection 144 to oscillate the paivl relatively to the non-rotatable clutch member 137 so that the teeth 136 and 138 yare in mesh to permit i the step by step movement ot the ratchet wheel B. Y

I have herein shown and described what I now consider the preferred manner ot carrying out the invention but the same is merely illustrative and I contemplate all changes and modi tications that come within the scope ot the claims appended hereto.

I claim:

1. In a hand brake, the combination with a. rotatable ratchet wheel; of means torrotating said wheel in a chain-winding direction; a release lever; a locking dog integral with said lever and cooperable with said ratchet wheel to hold the same against rotation in a reverse direction and adapted to be actuated by said level' to an inoperative position; and spring-influenced means autoiiiatically operable to hold said dog in its inoperative position out of engagement with said ratchet wheel, said means being arranged to have cert-ain relative movement to permit normal ratcheting ot said dog with-- out locking the same.

In -a hand brake, the combination with a vertical sta'lli1 and a ratchet wheel rotatable therewith; ot' means for rotating said stati' in a winding direction; a release lever; a locking dog` integral with said lever and cooperable with said ratchet wheel to hold the same against rotation vin a reverse direction `and adapted to be actuated to an inoi'ierative position by said release lever; and clutch .means non-rotatable with said' dog and automatically coacting therewith to hold the latter in its inoperative position out of engagement with said ratchet wheel'whcn the release lever is actuated, said clutch ,means being'arranged to have relative `movement therebetween to permit normal ratcheting ot'` said dog without` actuation of said holding means. i Y

3. In a hand brake, the combination with a rotatable ratchet wheel; ot means for rotating said stati:1 in a step by step movement;

a release lever; a locking dog operably connected to said lever to move in unison therewith and hold the ratchet wheel 'against rotation in a reverse direction; a clutch member movable in unison with said dog and provided with clutch teeth; a clutch member non-rotatably but vertically movable into engagement with said first-mentioned clutch teeth to hold said dog in its inoperative position out ot' engagement with said ratchet wheel, the teeth of said clutch members being arranged to have certain relative movement to permit normal ratcheting of said dog; and means for automatically actuating said clutch member.

4. In a hand brake, the combination with a rotatable ratchet, wheel; ot means tor rotating said stati; a release lever; a locking dog cooperable with said ratchet wheel to hold the same against rotation in a reverse direction and adapted to be actuated by said lever to an inoperative position; a clutch element associated with said dog and actuated thereby; a spring-influenced clutch member non-rotatable but' vertically movable into bearing engagement with said clutch element and arranged to permit relative movement between said clutch member and clutch element to permit normal ratcheting of said dog, said clutch member and element being operable to hold said dog in its inoperative position ont ot engagement with said ratchet wheel lwhen the release lever is actuated; and means carried by said rotating means to release the dog holding means.

5. In a hand brake, the combination with a ratchet wheel; of means for rotating said stati' in a step by step movement in a chainwinding direction; a ulcrum member `for said mea-ns; a release lever; a locking dog cooperable with said ratchet wheel vto hold the same againstrotation in a reverse direction and adapted to be actuated by said release lever in unison therewith to an inoperative position; a clutch part carried by said dog; a spring-influenced clutch member arranged above said clutch part and non-rotatable but vertically movable to coact therewith to hold the dog in its inoperative position out ot engagement with said ratchet wheel, said clutch member and clutch part being capable of limited relative movement to permit ratchetmg` of said dog` Without locking the same r1n inoperative position;

yand means on said carrier to engage said clutch member to release said dog so that itmay reengage said ratchet teeth.

G. In a hand brake for railway cars, the

combination with a rotatable member adapt ed to eeet tightening ot' the brake chain and rotated in yone direction, said member having' a ratchet Wheel rotatable in runison therewith;v of means for effecting step by vstep* rotation of said memberin a chain ,day of April 1924.

operative position; a clutch clement immovably associatcdwith said dog` and partaking of its movements; a second clutch element arranged to co-operate withA said lirst named clutch element, said second clutch element being movable ina direction toward and from the first named clutch element and normally influenced toward the first named clutch element, co-operating to prevent return ofthe dog to operative relation with respect to the ratchet Wheel When said dog has been manually actuated to full release position.

In Witness that I claim the foregoing I have hereunto subscribed my name this 1st JOHN r. oooNNon.

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