US2481012A - Hand brake - Google Patents

Description

p 1949' s. B. HASELTINE 2,481,012

HAND BRAKE Filed April 16, 1946 2 Shets-Sheet l In 1/8 n/o r: S/acy fl. Jamel/2728.

Sept. 6, 1949. s. B. HASELTINEQ HAND BRAKE 2 Sheets-Sheet 2 Filed April 16, 1946 five Ha 0r. a cy j iflasel iine.

Patented Sept. 6, 1949 Stacy B. Haseltine, La Grange,

111., assignor to W. H. Miner, Inc., Chicago, Ill., a corporation of Delaware Application April 16, 1946 Serial No. 662,578.

5 Claims. 1

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

One object or the invention is to provide in a hand brake mechanism, comprising a rotatable chain winding member, a pair of ratchet wheels rotatable with said member and having the teeth of one wheel staggered with respect tothe other, and a pair of sliding locking dogs having ratchetingengagement with said wheels respectively, simple and. efiicient means for throwing both dogs; into and out of engagement with the ratchet wheels.

A more specific object of the invention is to provide a mechanism as set forth in the preceding para-graph wherein the dogs are connected to each other by a rocker, and the means for throwing the dogs into and out of engagement comprises a. lever actuated, rotary trip element and,

a slide for transmitting motion from the trip element to the rocker.

Other objects of the invention will more clear- 1y appear from the description and claims hereinafter following.

In the drawings forminga part of this specie fication, Figure l is a. transverse, vertical sec-- tional view of the upper portion or a handbrake mechanism of the power multiplying, gear driven type, corresponding substantially to the line I-i' of Figure 2, illustrating my improvements in connection therewith. Figure 2 is a vertical see: I;

tional, View, corresponding substantially to the line 2 2 of Figure 1. Figure .3- is a transverse-,- vertical sectional view, corresponding; substan-- tially to the line 3-4. of Figure 2. Figures 4 and 5. are views similar to Figure 3, but show the.

parts in. different positions. Figure 6 is a detailed perspective view of one of the membersof the-two part trip elementillustrated in. Figures. 1 to 5 inclusive. Figure 7 is a side elevational View of one of the locking dogs. Figure 8 is a top plan view of the slide which transmits mos; tion to the locking dogs. Figure 9 is a side. e1e-' vational view of the slide shown in Figure 8."

Figure 10. is a View similar to. Figure-1, illustrating. another embodiment of the invention. Figwe 11 is a view similar to. Figure 10., illustrat.-;

ing the dogs in, released position. Figure 12. is;

a detailed perspective View of the slide-shown in. Figures 10. and l1, which, slide transmitsv motion to the locking dogs. Figure 1.3.1 is a transverse.

vertical sectional View, centrally. of. the, slide shown in Figure 12.

The drawings illustrate my improvements. as.

embodied in a well-known typeoi power multiplying. gear driven brake employing the usual E .lar block having a tooth- .between. the walls;

contained in the'usu'al. housing l-2-, the upper'por-v tion only of which is shown, in the drawings.

Referring first to the embodiment of the invention iilustrated in Figures 1 to 9 inclusive, my improved hand brake mechanism comprises broad-1ya pair of ratchet wheels AA,. rotatable withthedriving, pinion whichactuates the winding drum of the brake mechanism; a set of two locking dogs B and C; a. rocker D connecting the dogs B and C; an actuating lever E: a rotary trip element F operated by the lever; and a mo tion. transmitting' slide G;

The ratchet wheels A-A are preferably formed integral with the shaft I3 which. carries the pinion In, which is also formed as an integral: part Of the: shaft. The shaft [-3 is actuated by the usual hand wheel, not shown, which is located having peripheral ratchet teeth t6 thereon. The

teeth of the two ratchet wheels are arranged in stag ered relation, that is, the teethof the two wheels alternate with respect to each other, the teethof one-wheelv being-advanced .a distance of a. halt tooth with respect to the teeth. of the other wheel. Although the rotary ratchet means has been described :as composed of two laterally spaced ratchetwheels, it will be evident that the same may;- also be properly regarded as a singleratchet wheel having two annular set-s of ratchet teeth which: are lateral-1y separated by a groove.

The dogs B and C. ere-of similar design, each dog being in the form of an elongated, rectangu- !'lat its lower end. The two dogsare arranged-side by side-in spaced relation on opposite sides of theslide Gnand are embraced between: the front wall it of the housing and. a transverse partitionv wall l8, depending '=;from the top, wall -[def saidhousing, and between.

opposed-side-walls'il and 2! of the housing. provided .at. the upper end portion. of the latter,

The dogs B end-G are thusaguided. Mzand 1-8; and 2B. and 243 and maintained in vertical alignment with the ratchet wheels AA, respectively. Each dog is cut away on its inner side, at the upper end portion thereof, as indicated at 22, for a purpose hereinafter pointed out. Each dog is further provided with a relatively wide, vertically elongated guide opening 23 at the upper end portion thereof to accommodate the corresponding portion of the trip element F. The slide G, which is located between the dogs B and C, also has a relatively wide, elongated opening 24 therethrough at its upper end portion to accommodate the corresponding portion of the trip element.

The rocker D is in the form of a relatively short, cylindrical pin. This pinlike rocker has its opposite ends engaged in openings 2'5-25 in the dogs B and C, adjacent the lower ends of the latter, and extends through a relatively short, vertical slot 26 in the slide G. The opening of each dog is outwardly flared at the opposite ends thereof, said flared portions extending from the center of the dog to the outer sides thereof. Swiveling movement of the corresponding end of the pinl'ike rocker is thus provided.

As will be evident, the rocker D serves as a connection between the dogs B and C and is movable up and down with the slide G to effect upward and downward displacement of the dogs B and C to move the same away from and toward the ratchet wheels A--A.

The operating lever E, which is arranged exteriorly of the housing at the forward side thereof, is provided with a laterally projecting, cylindrical boss 28 forming a pivot member at its inner end, journaled in a bearing opening 29 in the front wall I4 of the housing. The boss 28 has a central bore 30 which also extends through the lever, adapted to receive a retaining bolt 3|, which holds the operating lever E against removal, as hereinafter will appear.

The trip element F, which is made in two parts, comprises a pair of interlocked, relatively heavy, tubular sleeve or collar members 32 and 33. The two members 32 and 33 are of similar design, except as hereinafter pointed out. E ach collar member has a laterally projecting, curved flange 34 between the ends thereof which extends approximately half way around the collar and presents transverse abutment shoulders 35 and 36 at opposite ends thereof. of each collar at opposite sides of the flange thereof form, in effect, hub portions of the same The collars 32 and 33 are carried by the bolt 3|, the shank of which extends through these collars and the bore 30 of the lever E, having its head bearing on the outer side of the lever and the nut thereof clamped against the inner end of the hub of the collar 33. The forward end of the collar 32 bears on the-boss 28 of the lever E and is locked to said boss by a projecting key portion 31 on the latter, engaged in a seat 38 in said collar. The two collars 32 and 33 are interlocked for rotation in unison by inter-engaging locking projections 39-39 thereon.

The trip element F extends through the openings 323 of the dogs B and C and the opening 24 of the slide G, being freely rotatable therein. The flanges 3434 of the trip element are located at opposite sides of the slide G, being accommodated in the openings provided by the cut away portions 2222 of the dogs. The shoulders 35 and 36 at opposite ends of these flanges cooperate with transversely aligned lugs 4lli0 on the slide G projecting from opposite sides thereof. As will be evident, upon rotation of the trip element'F in The cylindrical portions reverse directions, the shoulders 35 and 36 thereof are respectively brought into engagement with the lugs 40 of the slide G to move the latter downwardly and upwardly to engage the dogs B and C with, and disengage the same from, the ratchet wheels AA through the medium of the connecting rocker D. As will be seen upon reference to Figures 1 and 5, the openings 23-23 and 24 of the dogs B and C and the slide G are of sufficient length to permit the required movement to produce this result, and upward movement of the dogs B and C is positively limited by engagement of the lower end walls of the openings 2323 of the same with the hub portions of the collars 32 and 33 of the trip element F.

The operation of my improved brake mechanism as shown in Figures 1 to 9 inclusive is as follows: In applying the brakes, th ratchet wheels AA are rotated in clockwise direction, as seen in Figure 1, the dogs B and C ratcheting over the teeth of the same, being yieldingly held in engagement with the teeth of the respective wheels by the action of gravity on said dogs and the added weight of the lever E, which, acting through the shoulders 35-35 of the trip element F, presses downwardly on the lugs 40-40 of the slide G, the force being transmitted to the dogs through the slide G and the rocker D. As will be evident, alternate engagement of the dogs B and C with the ratchet means provided b the two wheels AA is permitted by the rocking action of the rocker D. In this connection, it is pointed out that, inasmuch as the teeth of the two ratchet wheels are staggered with respect to each other and each Wheel has a locking dog cooperating therewith, relatively fine locking adjustment of the brakes is had, the ratchet mechanism being locked against backward rotation, that is, rotation in brake releasing direction at half tooth intervals.

To release the brakes, the lever E is swung to th right until the shoulders 36-36 of the trip element F engage underneath the lug 20- 20 of the slide G as shown in Figure 4. Upon relieving the pressure on the particular do which is in full locking engagement with one of the teeth of the corresponding ratchet wheel, by slightly tightening the brakes, that is, rotation of the ratchet wheels in clockwise direction, the weight of the lever E, in its overbalanced condition, lifts the slide G, the rocker D, and the dogs B and C, thus automatically disengaging the latter from the ratchet wheel, as shown in Figure 5. The movement of each dog B and C away from the ratchet Wheel being limited by engagement of the lower end walls of the openings 23-23 thereof with the hub portions of the trip element, full withdrawal of both dogs to disengaged position, after movement of one dog has been arrested, is assured by the lever action of the rocker D.

The dogs B and C may also be disengaged from the ratchet wheel, without slight tightening of the brakes, by forcibly swinging the lever E direct- 1y to the final position shown in Figure 5.

To reengage the dogs with the ratchet wheels, the lever E is swung from the position shown in Figure 5 to the left, to the position shown in Figures 1 and 3, thereby engaging the shoulders 3535 of the trip element with the slide G to force the latter and the dogs downwardly toward the ratchet wheels.

Referring next to the embodiment of the invention illustrated in Figures 10, 11, 12, and 13, my improved brake mechanism comprises broadly a pair of ratchet Wheels in all respects similar to the ratchet wheels A-A hereinbefore described and also indicated by AA; a set of two locking dogs H and J; a rocker K connecting the two dogs H and J; an actuating lever L; a motion transmitting slide M; and a trip element N.

The dogs H and J are disposed side by side in spaced relation and in vertical alignment respectively with the ratchet wheels A-A, and the slide M is accommodated in the space between said dogs. The dogs H and J and the slide M are guided for vertical movement in a suitable guideway 4i provided in the housing. Each dog has a tooth 42 at its lower end cooperating with the corresponding ratchet wheel A.

The rocker K is similar to the rocker D hereinbefore described and is connected to the dogs H and J and the slide M in the same manner as the rocker D is connected to the corresponding parts, the slide and dogs being provided with openings 43 and 44-44 to accommodate the rocker.

The operating lever L has the trip element N connected thereto to be rotated in reverse directions as the lever is oscillated. The rotary trip element N is located to one side of the dogs H and J and is provided with a laterally projecting, arcuate flange 45 extending partly therearound and presenting shoulders 46 and 41 at opposite ends thereof, adapted to engage the slide M to actuate the same. As shown in Figure 12, the slide M is notched at one side to provide a downwardly facing shoulder 48 with which the shoulder 41 of the trip element is engageable to lift the slide and completely disengage the dogs from the ratchet wheel, as shown in Figure 11,

upward movement of the dogs being positively 1 limited by engagement thereof with a shoulder 49 on the housing. The shoulder 46 of the trip element is arranged to engage the upper end of the slide M, as shown in Figure to depress the slide and effect engagement of the dogs with the ratchet wheels.

The mechanism illustrated in Figures 10, 11, 12, and 13 operates in the same manner as that hereinbefore described in connection with Figures 1 to 9 inclusive and therefore needs no further detailed description.

I claim:

1. In a hand brake mechanism, the combination with a member adapted to be rotated to tighten the brakes; of a pair of ratchet wheels rotatable with said member; a locking dog engageable with each ratchet wheel; a rocker connecting said locking dogs; a slide for depressing and raising said rocker; and a lever operated trip element having spaced shoulders respectively engageable with said slide to move the dogs into and out of engagement with the ratchet wheels.

2. In a hand brake mechanism, the combination with a member adapted to be rotated to tighten the brakes; of a pair of ratchet wheels rotatable with said member, said ratchet wheels having teeth arranged in staggered relation; a vertically movable slide; a rocker carried by said slide and connected at opposite ends to said dogs; a pivoted lever; and rotary means actuated by movement of the pivoted lever in reverse directions, having shouldered engagement with said slide to depress and lift the same for raising and lowering said rocker and connected dogs to engage the latter with and disengage the same from the ratchet wheels.

3. In a hand brake mechanism, the combination with a member adapted to be rotated to tighten the brakes; of a pair of ratchet wheels rotatable with said member, said wheels having teeth arranged in staggered relation with respect to each other; a pair of sliding locking dogs respectively engageable with said ratchet wheels; a vertically movable slide; a rocker pin supported between its ends by said slide and connected at opposite ends to said dogs; a rotary trip element; and a lever for rotating said element in reverse directions, said trip element having circumferentially spaced, radial shoulders respectively engageable with said slide for moving the pin and connected dogs toward and away from the ratchet wheels.

4. In a hand brake mechanism, the combination with a member adapted to be rotated to tighten the brakes; of a pair of ratchet wheels rotatable with said member, said wheels having ratchet teeth thereon, the teeth of one wheel being staggered with respect to the teeth of the other; a pair of sliding locking dogs respectively engageable with said ratchet wheels; a vertically movable slide having a laterally projecting lug thereon; a pin connected between its ends to said slide and extending between said dogs, said pin having its opposite ends swiveled to said dogs, respectively; and a rotary trip element having circumferentially spaced shoulders respectively engageable with the lug of said slide upon rotation of the trip element in reverse directions to engage said dogs with and disengage the same from said ratchet wheels.

5. In a hand brake mechanism, the combination with a member adapted to be rotated to tighten the brakes; of a pair of coaxial, laterally spaced ratchet wheels rotatable with said member, said wheels having ratchet teeth, the teeth of each of said wheels being staggered with respect to the teeth of the other; a pair of laterally spaced, sliding locking dogs respectively engageable with said ratchet wheels; a pin extending between said dogs and having swiveled connection at opposite ends with said dogs, respectively; a slide for depressing and lifting said pin, said slide having a downwardly facing shoulder; and a lever actuated trip element rotatable in reverse directions having radially projecting, circumferentially spaced shoulders respectively engageable with the upper end of said slide and said downwardly facing shoulder to depress and lift the slide, pin, and dogs therewith to engage the latter with said ratchet wheels or disengage the same therefrom.

STACY B. HASEL'I'INE'.

REFERENCES CITED UNITED STATES PATENTS are of record in the Number Name Date 466,254 Morris Dec. 29, 1891 1,613,458 Hefferman Jan. 4, 1927 1,843,153 Graves Feb. 2, 1932

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