US1788525A - Hand brake - Google Patents

Description

Jan. i3, 1931. G. A. JoHNsoN 1,788,525

kHAND BRAKEv Filed Nov. 4, 1927 n?! z5 i Patented Jan. 13, 1931 gagement because of distortion and wear.

An ob]ect of this invention 1s to provide a i UNITED STTS; PAT-E GEORGE A. JOHNSON, OF CHICAGO, ILLINoIsAssIGNOR To w. II. YM'INNR, INC., or cHIoAGo, ILLINOIS, AlcORrORATION or DELAWARE `HAND BRAKE l Appncaribn filed November 4, 1927'. serial-No, 230,945.

This invention relates to improvements in hand brakes. Y ln the operation of geared mechanisms of certain types, excessivefrictionis developed between the gear teeth because of the difticulty in accuratelyplacing the axes ofrotation of the gears,resulting 'in failure to provide eflicient meshing engagement of the gear teeth at the pitch diameters thereof, and'particularly is'this true in hand vbrake mechanisms for railway cars whereinthe gears are seldom mounted in an accurate manner, and, even if so mounted, quickly lose accurate enhand brake mechanism including meshing gears which are automatically maintained in proper meshing relation, and which do not depend for efficient operation upon the accurate placing of the spindles rotate. A Y Y A more particular object of the. invention is to provide a hand brake mechanism of the `character, indicated, wherein the axis of rotation of only one of the meshing gears is fixed,

while the axis of the other gear ismovable with reference to the axis ofthe first gear, the axis of the movable gear being urged toward the stationary axis of the other gear under the influence of the pull of the brake chain on the lwinding drum, and maintained vin proper spacedl relation for the most effective-` meshing of the teeth of the gears by means gears which support ,the y Y mounted-upon the 'spindle 32 is an annular roller 33,'of a diameter corresponding tothe of shrouds onl the load; Y

@ther and further objects of the invention will more clearly appear from thedescription and claims hereinafterfollowing.

In the drawingsV forming a part of this- Y specification, Figure 1 s a fr'ontelevational` 3,'-3 of Figure 2.

V'so

As shown in the drawings, lOrepresentsfaf.

fragment ofthe end wallr cfa railway car,

uponl which they and secured to said wall is a support indicated broadly by the numeral 11. The support Vcomprises an inner wall 12, having'an extens ion 13 at its upper end secured to the wall 10 Vof the car by means'of rivetscindicatedatlf.

Formed integrallyV withthe upper portion of the wall 12 is a top wall 15, at the opposite endsv of .which are wallsl and 17. Y s c The top wall 15 is provided with an angula'rly disposed 18, towhich an outer plate 19 is secured by means'of rivets indicated at 20, the plate-19'being provided with angular extensions 21, the top flange 22 of which bears against the under surface of the integrally nformed side l top wall 15, while the vertical flange 23 thereof bears upon the adjacent side wall ofthe support and is secured thereto by rivets indicated at 24. y s

The plate V19 is provided with a centrally disposed boss 25, defining a bearingopening 26,. in which is rotatably mounteda short shaft 27, onjthe'outer end ofwhich is securedl a handfwheel 28. y. Preferably formed integrally with the inner end of the shaft 27 is a pinion29.y The pinion 29 is provided with an annularseries'of gear teeth 30, and upon opposite sidesoff'the gear teeth are formed shrouds-31-f31', said shrouds being annular in form and having their outerA peripheries coincidingwith thepitch diameterv of the gear teeth 3()` ofthe pinion'.A The innerwall12 is provided With a spindle 32 disposed axial- 1yl in linewiththe shaft 27, and rotatably ually tapering towards its jinner end, and v,

is provided with a helical thread 35adapted to ,guide th'ebrale chain, indicated at 36,

when sameis being wound` upon the "drum,V

means'f'of an eye member Vindicated at 37,1saidiV y proper, ,'Formedintegrally with the outerV end of the drum 34 is a cup-shaped-member chain; being connected tothe brake shoes,

the chain 36fbei`ng connected .to the drumbyy The opposite end of the drum is provided with a cup-shaped member 41, which has an internal annulai` tread 42, adapted to bear upon the treadof the roller Each-'of the vcup-shaped members 38 and 4 2 is Vprovided With fan outwardly extending jboss indicatedV atf'43 Yand' 4 4, respectively, the drum 34V and the bosses 43 and 44 being Vprovided with a central bore adapted for thereception of an axle 4 5, the inner end `of I the axle beingsupported in an elongated plate 46 dis.- posed in an elongated slot 47`in thevall 12, `to

' permit limited sliding movement of lthe plate and axle in a vertical direction. '"lhe outer end of the axle is likewise mounted in an `elongated plate 48, which is slidably mount- 4o, l mon is formed with a shank portion 53 of ed in a slot 49 in the front wall 19 of the support, a cot-tel Pill 50V extending through the end ot the axle as shown.

Means are provided .for Preventing retro grade Vrotation of the Winding drum 34, v said means including ravi `51 adapted to engage the gear teeth v39 ofthe ring gear A38 ,y preferably at the 10W-er end thereof, as shown. Said ila-W1 having a 'lateral 1511111111011 member provided With Vaf' cylindrical bearing portion 52 rotatably mounted vin an opening in the;

outer Wall 19 of the support. Outivardly of the cylindrical kbearing portion, the trun- Squarecros's Section .1119911 which ,is mounted an .Operating 'lever 0r Portion A53 upon which is mounted van operating lever or 'handle 5 4,

lie-1nd in position by a cotter pin '55, the handle being so arrangedvvith reference to the pawl'lthat the vveight of thehandle nor:

Y rnal'ly maintains ,the pawl' 51 vin'.fengagement 5ell Withthe teeth 39 of the gear 38,3While per.-` nitns the raul t0 ratchet over .the teeth.

39 when the, chain is being Wound upon the drum.

operation, vclockwise rotation' of VAthe hand Wheel 28 eiiects corresponding clockag Wise rotation ofthe pinion 29, which Atransmits its movement .te the gear 38 through the inter-engagement of the teeth 30 of the pinion therewith, resulting lin rotation ofthe drum 34 in a' clockwise direction.- During this 1m vement the pull ofthe brakechain 3 6' on the drum 34 urges the gear 38. toward the lpinion 29, the axle 475 being :tree tomove downward as vpermtted by the movement 9i the Plates 46nd@ 'in ,theslots 4T( and 4.9iv

the slotsfconiining any movement Which occurs to a. vertical direction.Y The opposite end of .the drum 34 is supported through the engagement of the annular bearing surface 42 of the member 41 upon the roller 33. The meshing of the teeth 30 and 39 of the pinion 29 andu gear 38, is governed by the kprovision of the shroudsv 31--31v ofY the'pinion 29, and

40-40'o the ring gear 38, said shrouds maintaining Vmeshing ofthe `teeth of the ygears .at ,their pitch diameters, and serving as supporting means for the drum at one side thereof. a clockwise direction to take up the chain, thepaWl 51 Will ratchet over the teeth 39 of the gear 3 8, as permitted by' the vpivotal i'nou'nt-ingl thereof and the disposition .of the handle 54, retrograde rotation ofthe gear 38 and consequently oi' the .drum 34, being v prevented by .the normal `engagement of the paivl 51 with the teeth of theigear'38. YVhen it is desired to release the brake, the handle 54 vis pulled in a clockwise direction, perm-itting'unwinding oiV the .chain from the drum 34 through counterfclockwiserotation of the gear 38, drum 34 and member 41. v

Vhile l have herein shown anddescribed hat l consider the preferred inannerol carrying out the invention, f the saine is lmerely illustrative, and' l ,contemplate all changes and modications'which come With-A in the scope of the claims appended hereto.

1. Ina hand brake mechanism of the character described, the 4( :ombination With a WindingVY ldrum having oppositely disposed annular cup-shaped members, each' of which is .provided with an annular bearing surface v;

anelement extending into each of saidV cupshaped members, each of said elements being of smaller diameter than said cup-shaped. members and mounted in spaced relation and. cao-axially Ato rotateabout relatively fixed4 axes, and means for mountingsaid drum ,to

effect rotation thereoi` about the central axis thereoic and 4the centraltarisof lsaid cup` v shapedzmembers, said means including an axle for said drum and fixed supports in vvhichfl the en ds of said axle are slidably mounted, said drum being arranged whereby the load" 'imposed upon the drum by the brake chain is borneby said cup-shapedmembers and `sav-'id rotatable elements. Y

2. Ina hand brake mechanism ,of the .charn acter described,v the combination with a Winding ldrum having an internal ringigear WhileV drum 34 is being Wound in rigidlyfaixed thereto and `rota-table 'therefr` Y with; meansfor supporting said drum forrotation'about acent-ral axis, a pinion engaging said Vring. gear torv driving said drum;V A`and aloclring pawl disposed Within thefringlgear also engageable with' the iiitermal teeth thero wrrevent, retrograde' rotationl of the fsame,' said pavvl 'having an operating handle exteriorly of the gear by Which the same may be manipulated. j Y

t 3. In ahand brake mechanism of the character described, the combination With a support providing spaced vertiCalvvallS, having` vertically extended elongated slots therein; of a Winding drum provided with oppositely disposed cup-shaped members at its ends, one of Which is in the fo-rm of an internal ring gear, and the other of which is provided With a smooth annular engaging portion, said drum having an axle theends of Which are slidably mounted in the slots in said support; a roller mounted to rotate about a fixed axis With reference to the Wall adjacent the cup-shaped memberk having the smooth annular bearing surface,jsaid roller being posed in supporting relation with respect to said bearing surface; a pinion co-o-perating with said ring gear, said pinion being rotatable about a relatively fixed axis arranged co-'axially With reference to the axis of said roller, said pinion being disposed in support ing relation With said ring gear, and the teeth of said pinion meshing with they teeth of the ring gear; and a gravity influenced pawl engageable with the teeth of said ring gear to prevent retrograde rotation thereof.

4. In a hand brakemechanism of the character described, the combination `vvith a support providing spaced vertical Wal-ls, having vertically extended elongated slots therein;-

means for said drum; one of saidrotatable members andthe cooperating bearing members being in driving engagement; manually operated means for rotating said last named rotatable vmember to effect Winding movement ofthe drum; and a brake tightenlng element connected to the drum and suspended `therefrom, said tightening4 element being connected to the brake'mechanism proper of the car. Y ,6. In a hand brake for cars, theecombination with` a chain Winding drum havingA af bearing member fixed thereto, said drum and bearing member being rotatable about a common axis, said bearing member being of ringlike form and having an interior annular bearing surface; a cylindrical'bearing member supported for rotation about ar horizontal Yaxis eccentric to said first named axis, said cylindrical bearing member engaging Within :Said Aring-like ymember and-'supporting the latter and said drum, said cylindrical member and the ring-like member being inl driving engagement; and a br'akechain connected to the drum and suspended therefrom, said brake chain :being operatively connected to thel brake mechanism proper of the car.

, In WitnessV that I claim thev foregoing I, have .hereunto subscribed my name this lst Y day of November, 1927. y

- vGEORGE A. JOHNSON.

of a Winding drum provided with oppositely4 disposed cup-shaped members atits ends, one of Which is in the form of an internal ring' gear, and the other of Which is provided with a smooth annular engaging portion, said Y drum having an axle the ends of'which are 'i slidably mounted in the slots in said support; a. roller mounted to rotate about a fixed axis With reference tothe Wall adjacent the cupshaped member having the smooth annular bearing surface, said roller being disposed in supporting relation with respect to said Vbearing surface; a pinion co-operating With said ring gear, said pinion `being rotatableV about a relatively fixed axis arranged co1V axially With reference to the axis of said n roller, said pinion being disposed in supporting relation with said ring gear, and the teeth of said pinion meshing with the teeth ofthe 'Y ring gear, said ring gear and said pinion'being provided with shroudsvvhich support the load Y Y and assure meshing engagement of the teeth of said pinion and ring gear at their pitch diameters. I v

5. In a hand bra-ke `for railway cars, the combination with a Windingdrum, having 'bearing members at opposite ends thereof,

presenting interior annular bearing surfaces;

Y of a pair of rotatable supporting members rotatable about alined horizontal axesengaging Within said annular bearing membersvand suspending the same to support said Winding4 drum and forming theV usual supporting

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