US1877308A - Hand brake - Google Patents

Description

-fwW.

Inna/1:222

l atented Sept. 13, 1932 UNITED STATES ArENr Jessie fiAiaitis, on wfinhroninnmois, assieivoit'ro Wil -I. mate omelet; InLrNoi's, A ooai o'rmrroiv OEDELAWARE HANb' BRA E V Application filed neeemberfee, 1929] Serial No. 416,359."

This invention relates to improvements in hand brakes. a V 7 One object of the invention is to provide a simple and efficient hand brake of the power multiplying gear type, including a conical or tapered drum on which the brake chain is wound to provide for quicktakeup of the slack of the chain and brake mechanism at the initiation of the winding operation, during which operation the chain'is wound on the larger diameter :of the drum, followed by slower winding withyin'creased force applied to the brake mechanism by 'windingfoi the chain on that portion ofthe d ruin which is of reduced diametenwherein the driving gears are so designed that they counterbalance the end thrust produced by the winding of the chain, thereby greatly reducing the wear. incident thereto on the bearings of the device and also overcoming the tendency of distortion of the parts of the ino i ufting for the brake.

further ob"ec-t of the invention is to vide a hand brake including a winding drum,

power multiplying gearing for driving'the dru-m and a housing within which the parts are enclosed, all so designed that the parts I tivfely. 7 p p 7 A still further object of the invention is to,

may be readily and economically assembled.) the housing for this purpose being composed of two, parts which are rigidly secured togetherjand the parts of which are provided a with alined sets of bearing means for the bearing elements at opposite ends of the winding drum and the driving gear respeck provide a hand brake of the character described in the preceding paragraph-including {a ratchet member-and cooperating pivot- ;i ed dog for preventing retrograde movement o f'the winding drum, wherein the dog is provided with'trun'nions and the two sections of the housing are provided with al-ined. pivot sockets accommodatingthe trunnions.

= l Otherobjects of the invention will more clearly ppear from the description and claims hereinafter following. 1 V- In the drawing forming a part of this specification, Figure =1-is a front elevational View of my improved hand brake mechanism as shown in Figure l. Y'Ihebackwall l-l'is provided with three securing lugs Hi -15 wer end of the same. Any Qwell know'fi of a railway car, certain parts of the meta anism interiorly ofthehousing being "illus= trated in. dotted lin s. Figure'Q is a vertical-f; sectional view corresponding substantially to l the line 22of Figure 1. And Figure 3"isi a sectional view,' taken on two transverse" planes intersecting each other at an angle and corresponding substantially to the line 33 of Figure 1. i V In said drawing, the end wall of the car is designated by 10 and serves as the sup porting means for'the housing of -my irnproved'han'd brake mechanisim In carrying out my invention, I providega housing of the sectional type=,.fpreferably composed of two :partsyas clearly shown in Figures 2 and 3. The housing com-prises back and front sections designated by 11 and 12 respectively. The back section of the housing comprises avertical wall memberof plate-like form having spaced, laterally ex" tending, vertically *disposed'side "wallsec tions '13-13 formed integral therewith; which side wall sectionsare connected "at j the upper end by a curved top walll l, also formed integral with the p late likeb-ack wall 11. The walls 13 13 aiid'll and the ;con-. tour of the back 'wall "ll'a're substantially 15, one o zt'whichis "disposed at the :ap'pe'r end ofthe plate and the remaining two of which are "disposed at "oppf'osite' -si desc at the type 'of securing means may befiemjplojyed for fastening the section *11 oithe housing to a the end wall of the car; and-as hereinsho-wna the same is secured by rivets extending through the-lugs 15 'andsaidend wan to of the car. The front'isectionof the housingv includes' a' front wall proper '16; "substantial ly parallel to the "back wall of the rearisec tion of "the housing; 'andan' 'outward ly o'hfset portion 17 forming a pocket for a pur- 95'- pose hereinafter pointed out. The-section 12 oi the housing has vertically disposed curved side walls 181-8 formed-integral therewith and in 'alinement with the f wall portions of the rear section of thehousi-ng. 1 01)..

As clearly shown in Figure 3, the walls 1313 of the rear section of the housing are ofiset nwardly along their outer edges as indicated at 19l9' so that the inner edges of the walls18l8 of the outer section of the housing; maybe telescoped thereover. In order to permanently secure the parts of the housing together, the telescoped portions of the walls 1313and 18 18 are riveted to ened lug portion22,

gether, as" clearly shown" in Figures 1 and 2. The upper end portiorrof the wall '16 is thickened,as indicated at 20, said thickened portion projecting inwardly and hav-' "ing a bearing opening-21 thereinfora purpose hereinafterpomted out. The outer end of the top wall '14 of therear section or the housing is provided with a depending thiclzopening'in alinement with the opening 21 of h the front section -of the housing, said open- V ing-in the lug22 bemg'also designated by 21. vThefront wall 16 of the outer section of the housin is provided with an elongated.

hollow'boss 23 outwardly extending therefrom and formed inte ral therewith. The

hollow boss forms a bearing member for the 7 operating shaftof-my improved bralre' mechanism, (as-hereinafter more fully pointed out. The rear wall of the inner section ofthe hous ing is provided with a relatively short inwardly projecting bearing boss 24, having a bearing opening in alinementwith the bearing'opening of the? boss 23. The walll'? of the pocket at the lower end of the outer section of the housing is" also providedwitn an inwardly extending bossi25 and the wall 11 f the inner section of the llOUSlIlgiS pro-;

vided with a similar boss 26 in alinement with. the boss 25, the bosses and '26 hav' ing alined bearing openings. {My-improved brake mechanism proper comprises broadly 'a winding drum A, a gear B. a pinion C, afdrive shaftcD, a hand wheel a-ratchet member F and alocking dog Gr. 1

The winding drum A is of conical form andhas a substantially spiral winding groove 27 thereon. At the end of larger diameter,

7 the drum is provided with an outstanding lug 28 to which theend of the brake chain s 26 'ofthefront and rearsections ofithe hous-' ing respectively; I The gear B is preferably 29 is secured. As will be understood, the brake chain 29 is 'connected to the brake mechanism of the car, not-shown, in the usual,

manner- The brakedrum is provided with trun'nions 30i30 atfopp'osite ends thereof formed integral therewith and journaled in the-bearing openings of the bosses 25 and formed integral with the drum Afl and is located at the endfof the drum which is of larger diameter. Thegear B is of tapered or beveledform,as clearly shownin Figures '2 and 3 of the I drawing.

Th'e pinion Cris fixed to the shaft D, which is rotatably journaled in the bosses'or bear-' F fixed thereto with which the locking dog which has a bearing gravity.

- rams G cooperates. The locking dog is of bell crank form, one arm thereof beingvprovided with p a tooth member 31 which cooperates with the ratchet-Rand the other arm thereof being provided with a manipulating grip portion 82, The locking dog is provided with pivot trunnions 3333 at oppositesides 7.

thereof which are journaled in.- the" alined openings 21'21'of thefront and rear sec-. tions of: the housingmAs, clearly showniin disposed'that the weight of the same urges the teeth of the dog into engagement with the ratchet 'member F' byv the action of In assemblingvmy improved hand brakemechanism, the trunnion at the inner end of the brake drum is engaged within the bear ingboss 26 of the rear section-of thehousing, the innerend of the shaft D engaged within the bearing boss 24 of said section of the housing andthe inner trunnion of the locking dog engaged within the bearing opening 21 of said rear section. The front section of the housing is then applied, the shaft D being passed through the bearing Figure 1, the vhandle end of the dog. iszsoc member 23 and the front trunnions 0t the winding drum A and the dog G engaged within the corresponding bearing openings of the-front section. The parts of the housing are then rivetedtogether, thereby securing all of the parts permanently in operative relation; I

The operation of my improved handbrake mechanism is as follows:' In applyingther brakes, the hand Wheel E is-rotated in a clockwise direction, as viewed in Figure-1,-

thereby effecting rotation of th d i i pinion C which meshes with the gear B,

thereby rotating the latter in a contra-clock- 7 wise direction and rotating'thed'rum'A therewith, thereby winding the chain 29 on the drum; Inasmuch-as the drum is of conical form and the brake chain is secured to that 7 portion thereof which is of larger diameter,

no I

a relatively rapid takeup of the brake chain is effected during the initial chain winding-i operation due to the chainbeing wo'u'ndabout the larger diameter of the drum; Theslackc in the brake chain and the brake mechanism is thus rapidly taken up: 7 During the furf ther brake tightening operation, the chain 29 will be'wound about the conicaldrum', thereby greatly'increasing the power -durg-- mg the final application of the I brakes due,

to the chain being wound about the portion of the drum of decreasing diameter. Inasmuch as the gear B is of much greater diameter than the driving pinion, the power applied by the operatorto the hand Wheel E willbe greatly multiplied in the brake winding operation. The locking dog G, which cooperates with the ratchet member F, prevents backward movement of the driving shaft D and through the intermeshing gears holds the chain winding drum A against movement in an unwindingdirection,

While the brake chain is being wound on the conical or tapered drum A, a certain amount of end thrust is produced tending to force the drum in a lefthand direction, as viewed in Figure 2. The driving. pinion C and the cooperating gear B being reverse-.

ly beveled and the gear B having the bevel thereof tapered in a direction reversely to the taper of the winding drum, these intermeshing gears will counter balance the end thrust of the winding drum during the chain winding operation, the tendency of the inv termeshing gears being to produce an end thrust'towar'd the right, as viewed in Figure 2, of the gear B and the brake drum which is fixed thereto. As will be evident, my improved arrangement of bevel gearing thus counterbalances the end thrust on the drum due to the Winding of the chain thereon, thereby greatly reducing the wear on the hearing members of the rotary parts of the brake mechanism and further preventing distortion of the housing dueto said end thrust.

When it is desired to release the brakes, the

operator disengages the dog G from the ratchet wheel, thereby permitting free rota tion of the winding drum. In order to maintain the dog disengaged from the ratchet wheel, the hand grip is thrown to the left, as seen in Figure 1, to suchan extent that it overbalances the toothed ,end of the dog,

thereby maintaining the dogdisengaged through the action of gravity. In case it is desired to back up the brakes, the hand wheel may be rotated in a contra-clockwisedirection, as viewed in Figure 1, while the looking dog is disengaged from the ratchet mem her.

I have herein shown and described what I now consider the preferred manner of carrying out my invention, but the same is merely illustrative and I contemplate all changes and modifications that come within,

a tapered drum on which the brake chainis Y wound; of a tapered gear of relatively large diameter fixed to the drum; a tapered drivdrum; and means for rotating said pinion .to wind the brake chain on the drum.

2. In a hand brake, thecombination with a tapered drum on which the brake chain is 1 adapted to be wound; of a tapered gear of relatively large diameter fixed to the drum P at the end thereof of greatest diameter; a

tapered driving pinion meshing with said ing said pinion to wind the brake chain on the drum.

3. In a hand brake mechanism, the com-5 1 .bination with a two-part housing comprisingfront and rear sectionsrigidly secured to'each other,said housing sections having spaced front and rear walls respectively,

said rear wall having an inwardly opening bearing socket and said front wall having-a bearing opening aligned with said socket;

of a chain-winding drum journaled in said front and rear walls forrotation about an axis at substantially right angles to said v walls; a tapered gear fixed to the drum, said gear being-tapered toward said rear wall; an

operating shaft having a hand wheel at the outer end, said shaft extending through and bemg ournaled in the bearing opening of said front wall, said shaft having the inner end thereof journaled in the bearing socket; tapered pinion fixed to said shaft, said; pinion meshing with said gear and being tapered in a direction reverse to the taper of said gear, whereby the inner end of said shaft 1s held seated in said bearing socket. V

In witness that I claim the foregoing I have hereunto subscribed my namethis 23rd day of December 1929.

- Q J OSEPH HARRIS."

ing pinion meshing with said gear,said gear I

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