US1469084A - Hand brake for railway cars - Google Patents

Description

sept. 25,1923.

. S. B. HASELTINE` HAND BRAKE Fon RAILWAY oAns Filed Maya, 1922 Batented Sept. 25, 1923.

UNTED STATES l please@ 'fr ortica.

PATE

STACY B. HASELTINE, OF CHICAGO ILLINOIS, ASSIGNOR TO VILLIAM H. MINER, O Y, CRAZY, NEW YORK.

HAND enana ron RAILWAY cAns.

Application filed May 8,V

.To @ZZ w from. t may concern:

Be it known that I, STACY B. IIAsnL'riNn, a citizen of the United States, residing at. Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in I-Iand Brakes forV Railway Cars, of which the following is a full, clear, concise, and exact description,

reference being had to the accompanying drawings, fication. y

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

One object of the invention is to provide an efficient hand brake mechanism of the ratcheting type and more particularly one in which engagement between the pawl and ratchet wheel is always made quickly without possibility of undue lost motion or shortening of the power stroke of the operating handle.

Another object of the invention is to provide an arrangement for holding the winding member against accidental reverse rotation, which arrangement includes a holding dog or latch adapted to be released by the same operating handle which is employed in applying the brake in combination with efficient means to prevent such release accidentally at any time during the application of the brakes.

Other objects of the invent-ion Vwill more clearly appear from the description and claims hereinafter following.

In the drawing forming apart of this specification, Figure 1 is a vertical, sectional view of an improved vhand brake shown applied to the end wall of a car, the section corresponding substantially to the section line 1 1 of Figure 3. Figure 2 is a similar vertical, section corresponding to the section line 2-2 of Figure 3. Figure 3 is a vertical, sectional view taken perpendicular to the car wall substantially diametrically of the mechanism and corresponding to the line 3-3 of Figure 1. And Figure 4l is a horizontal, sectional view corresponding to the line 4-4- of Figure 1 illustrating certain details, parts being broken away. j

In said drawing, the end wall of the car is indicated at l() and to which Lthe improved mechanism is adopted to be secured. They improved mechanism includes a main outer forming a partv of this specishell or casing designated generally by the 1922. Serial No. 559,187.

reference character A,the same being of cylindrical form having an integral outer end wall 11 and securing [langes 12-12 at its inner end by which it is riveted to the wall. The vcasing A. is provided at the bottom thereof with a longitudinally extending opening 13 to permit entrance of the chain and also to allow for the back and forth movements of theoperating handle. At its inner end, thecasing is formed with a partial segmental shaped wall 111 of appreciably less than half ofthe area of the casing, theV remainder of the back wall being completed by a separate lmember 15 so shaped as to complete the back wall, said member 15 preferably having beveled edges 16-16engaging with ,corresponding beveled edges on the casing ,sothatthe member 15 will lie flush with the back wall 14- when the casing is attached to the car wall. j Y

The outer end wall 11 of the casing is formed with an inwardly extending integral stud 17 and an opposing oppositely. extending stud *18 is formed on the member 15,' as clearly shown in Figure 3. A journal vfor the winding drum is provided by a tubular elementl) which fits over the two studs 17 and 18 and is preferably riveted to the stud 18 as by the rivet 20. rIn this manner-it will be noted that I obtain van elongated journal thus providing the maximum length of bearing surface for the rotatable chain winding drum B.

The drum B has a main winding section proper 21 with an annular flange 22 at its inner end and a partition-forming flange 23 at the opposite end of the winding section 21. On oneY side and preferably adjacent the partition. flange 23, the drum- B. is formed with an integral lug 2lb-notched as indicated at 25 to pro-vide a hook for the end link 26 of the chain running to the usual sheave wheel at the bottom ofthe car. The hook-Shaped lug 24 is so positioned that the link 2G may be hooked thereover before the drum is telescoped over the tubular bearing 19 and when assembled with the latter the link 26 is locked in position as clearly shown in Figure 3. It will benoted that the partition flange 23, in effect, divides the casing Figure L3, the drum member B is provided with `a circular bearing 27 relatively narrow. To the right of the bearing 27, the

drum member Bis formed Vwith diametrically disposed urved keying lugs 23---28 as shown in Figure l and over which is assembled the ratchet wheel 29, thus interlocking the latter with the drum member B so that they rotate simultaneously. To the right of the key lugs 28, as viewed in Figure 3, the

' drum member B is provided with an addieration of a brake mechanism, inasmuch asV it minimizes Athe possible lost motion inV tional bearing 30 of lesser diameter than the bearing 27.

The bearings 27 and 30 support a carrier or fulcruin member C, the latter having spaced side walls 31-31 with journal bearing openings therein corresponding to the bearings 27 Vand 30 and an arcuate connecting web 32 between the flanges3l. Pivotally supported on the carrier C is a pawl D, as by means ofthe rivet33.v Said pawl. D

Y is provided with a tooth 34 normally out of Yengagement with but adaptedl to engage the peripheral teeth Vof the ratchet wheel 29, as clearly indicated in Figure l. @n theopposite'side of the pivot 33 to the tooth 34, the pawl Dy is formed with a curved tail-piece 35 having an OG curved surface 36, as shown lin Figure l.

The carrier C is formed with a pair-of radially extending ears or flanges 37-37 between which ispivotally mounted as by the rivet 38, lthe operating handle or lever E. The-latter is formedfwith a curved projection or finger 39 of suitable contour to cooperate with the OG curved surface 36 of the pawl D. 'With this arrangement, when the operating` handle E is pulled toward the left, as viewed in Figure l, thelug or finger 39'will swing the tail-piece 35 of the pawl D and throw-the tooth of the latter into engagement with theratchet'wlieel. `Aeswill be clear from an inspection of Figure l, a very slight angular `movement of the handle E on its pivot will produce a greater and therefore quicker angular movement of the tooth 34 on account of the relatively short radius from the pivotof the pawl D to the point of effective engagement of the handle and tailpiece 35. This is of importance in the opeffecting operative engagement with the ratchet `wheel each time a power stroke isV 'tooth 42 adapted to engage with the ratchet wheel as shown in Figure 1 and has a relatively heavyeXtension 43 passing outwardly through an opening 44 in the casing A, the latter beingv laterally offset at this point to form a hood or weather shield for the dog as indicated at 45 in Figure l. The heavy' extension 43 is continued downwardly with a tail-piece 46 having arounded lower cani edge 47. With the arrangementthus far described, it will be seen that the latch or dog F is gravity influenced to automatically engagerwith the ratchet wheel. y

To disengagethe tooth 4,2 of the dog from the ratchet wheel,'the operating handle E has a relatively heavy lug 4S extended toward the tail-piece of the dog F, said lug 48 having a curved surface 49 adapted to engage the rounded edge 47 of the dog and, when the handle is swung a sufficient distance counterclockfvise, as viewed in Figure l, will engage the dog F and swing .it so as to pull the tooth 42 away from the ratchet wheel. In this connection, it will be :observed that l obtain a relatively'high leverage ratio in disengaging the dog from the ratchet wheel, which is of impor-tance in facilitating release of the brake rapidly and particularly where the brake chain has been rplaced under a high tension and'undercut teeth areremployed on the ratchet wheel, as shown in Figure l, since, during the release, the ratchet wheel must be given slightamount of further rotation in a winding direction before the vdog `tooth can be disengaged. Y

In order to prevent accidental disengage- `ment of: the dog from the ratchet wheel when the brakeman is using the handle E,.l provide the following arrangement. .Pivotally supported between the end' wall Y11 of the casing and the inturnedilange 4lY previously referred to, as by 'means of the rivet 50 shown in Figure 4, is'asector-like block l. The latter is provided with a 'laterally'extended finger piece or pin 52 movable within an arcuate slot 53 formed in the end wall ll of the casing, as shown best in Figures l' time the pin 52 is at Ythe lower end of the slot 53, the block acts as a limiting stopto movements of the pawl D` and consequently the carrier C in a counter-clocki'vise direction and thepparts are so Apositionedthat when the pawl and carrier D are thus stopped in their movements, the lug` 48eof the operating handle will not quite engage the tail-piece of the'dog VF, as shown in Figure l. When the brakeman desires to release the brakes, he swings the gravity block 51 to its other VeXtreme position as shown by the dotted lines in 'Figure l, thus permitting the operating handle and `carrier `C and pawl D to swing farther in a counterclockwise direction and sufficiently for Vthe aiv lug 480i thehandle to engage the dog F and in turn disengage the latter from the ratchet wheel.

From the preceding description, it will be seenthat I provide Jfor quick engagement ot the operating pawl to effect winding; provide vfor relatively powerful leverage ratio to effect disengagement oi' thelocking dog from the ratchet wheel; and alsol employ only one operating lever or handle for effecting both the winding up of the brake chain and the release thereof. In addition, the arrangement also prevents accidental release as previously described.

I have herein shown and described what I now consider the preferred' manner of carrying out the invention, but the same is merely illustrative and Iv contemplate all changes and modifications that come within the scope or" the claims appended hereto.

I claim:

l. In a hand brake for cars and the like, the combination with a rotatable member;

of a ratchet wheel rotatable in unison therewith; a carrier oscillatably mounted with respect to said wheel; a pawl pivotally mounted on said carrier and cooperable with said ratchet wheel; an operating handle mounted on said carrier for movement relative thereto and cooperable with said pawl to move it to operative position; and locking means for preventing rotation of said member accidentally in an unwinding direction.

2. In a hand brake for cars and the like, the combination with a rotatable member; of a ratchet wheel rotatable in unison therewith; a carrier oscillatably mounted with respect to said whe'el; a pawl pivotally mounted on said carrier and cooperable with said ratchet wheel; an operating handle pivoted on said carrier at a different point and cooperable with said pawl to move it to operative position; locking means-'for preventing rotation of said member accidentally in an unwinding direction; and means on said handle cooperable with said locking means to render the latter inoperative when said handle is moved against said lockingr means.

3. In a'hand brake for cars and the like, the combination with a rotatable member tor effecting tightening of the brake chain; ot a ratchet wheel rotatable in unison therewith; a carrier oscillatable with respect to said wheel; a pawl pivotally mounted on said carrier and provided with a tooth cooperable with the ratchet wheel, said pawl being provided also on the opposite side of its pivot to that of the tooth, with a tail-piece; an operating handle pivotally mounted on said carrier at adifferent point and provided with means to engage said tail-piece of the pawl and throw the latter into operative relation with the ratchet wheel; and locking means for preventing accidental rotation of said member in a reverse direction.

1- In a hand brake for cars and the like,

mounted on said carrier at a different point l and provided with means to engage saidV tail-piece of the pawl to throw the latter into operative relation with the ratchet wheel; locking means for preventing accidental rotation of said member in a reverse direction; and means on said handle cooperable with said lockingmeans to render the latter inoperative when the handle is swung kinto engagement with said locking'means.

5. Ina hand brake of thecharacter described, the combination with a rotatableA member for effecting tightening of the brake chain; of ratchet mechanism for et'- ecting step by step rotation of said member, said mechanism including` an operating Ihandle movable in one direction to actuate the mechanism; locking means toprevent accidental rotation of said member in an unwinding direction; cooperable means on said handle and locking means to render the latter inoperative when said handle is moved in a direction opposite to that necessary to actuate said mechanism; and a shiftable safety device adapted to prevent cooperative relation between said locking means and means on the handle cooperable therewith. f 6. In a hand brake of the character described, the combination with a member for efecting tightening of the brake chain; of ratcheting mechanism for effecting step by step rotation of said member, said mechanism including an operating handle movable in one direction to actuate the mechanism; locking means including` a pivoted dog to prevent rotation of said member accidentally in an unwinding direction; means on said handle engageable with said dog to move the latter to inoperative position, when the handle is moved in a direction opposite to that necessary to actuate said mechanism; and an adjustable safety device adapted to prevent or permit cooperative engagement between said dog and said means on said handle cooperable therewith.

7. In a hand brake of the character described, the combination with a rotatable chain winding drum; of ratcheting means for effecting step by step rotation of said drum and including a bodily movable and pivotally mounted operating handle; means for locking said drum against rotation in Van unwinding direction and including a pivotally mounted dog' .having a tail-piece; an extension on said operating handle adapted to engage said tail-piece of thedog to move the latter to inoperative position when the handle is moved in one direction; and a manually adjustable safety element adapted to prevent or permit cooperative relation between said extension on the handle and tail-pieceot the dog'.

8. In a handbrake of the character described, the combination With a casing .of generally cylindrical 'form having an integral outer end Wall and adapted to beY secured at its innervend to a Wall of a car; oii a bearing extending` axially of said casing` tlierewithin; a Winding;` drum member .rotatably mountedon said bearing` and having a Winding portion proper; a ratchet Wheel rigidly secured to said drum member; a carn rier oscillatably mounted .on said `drum member andstraddling' said ratchet wheel; an operating handle pivotally mounted on said carrier; a pawl pivotallymounted on said carrier at a different lpoint and are ranged to cooperate With said ratchet Wheel,

.said pawl and handle having cooperable engaging .sections to actuate vthe paWl .to :operative position When the handle is pulled in `one direction; a lockinggravity actuated dog pivotally mounted on said casing and cooperable with said ratchet Wheel tojprevent rotation of `the latter and drum in Aan unwinding direction, said dog having a tailpiece; an extension on saidhandle adapted to engage said `tail-,piece to disengage the latterl from the ratchet Wheel when lthe handle is moved in ta direction opposite to l*that first mentioned; and a block lpivotally mounted on said casingat :a point intermediatethedog andthe operating handle, said block 1n onetposition preventing` engagement betweenthe handle and the dog' and, in another position, permitting` Asuch engagement. In Witness that I claim the 'foregoing havehereunto subscribed my name this 18th day of April 1922. i '1 sTAoYV B. HirsELTiNn. Y

lVitnesSeS n CARRIE GAILNG, ANN BAKER.

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