US2537270A

US2537270A - Hand brake

Info

Publication number: US2537270A
Application number: US643358A
Authority: US
Inventors: Stacy B Haseltine
Original assignee: W H MINER Inc
Current assignee: W H MINER Inc
Priority date: 1946-01-25
Filing date: 1946-01-25
Publication date: 1951-01-09
Anticipated expiration: 1968-01-09

Description

Jan. 9, 1951 Filed Jan. 25, 1946 s. B. HASELTINE 2,537,270

HAND BRAKE 2 Sheet's-Sheet l \Slac u ,B. MseZ ifz'ne.

In Van Jar:

Jan. 9, 1951 s B, HA E NE 2,537,270

HAND BRAKE iled Jan. 25, 1946 2 Sheets-Sheet 2 InVe 22/02".- S/acu .29. Hase zlilne.

Patented Jan. 9, i951 Stacy B. Haseltine, La Gret 111., 'assiignor to W. H. Miner, Inc., Chicago, Ill., a corporat ion of Delaware Application January 25, 19si6,iSerial-No. 6 i 3,3 58

This invention relatesto improvements in hand brakes for railway cars, and more particularly to such brakes of the power multiplying type;

One object of the invention is to provide ina hand brake mechanism of the 'character'indicated, including a chain winding'drum, a gear rotatable with the drum, a. driving pinion meshi'ng with the gear, a driving shaft on which the pinion is fixedly mounted, a ratchet wheel fixed to the driving shaft, and a pivoted locking dog cooperating with therratchet wheel, simple, efiicient and reliable, manually controlled. means for positively engagingthe dog with and disenf gaging the same from .the ratchetwheel, comwhich is supported for rotation about the axisof rotation of the driving shaft;

A more specific object of the invention is to provide a hand brake mechanism as set vforth in the preceding paragraph wherein the lever operated trip member and dog have cooperating engaging means thereon for positively moving the dog into and out of engagement with the ratchet wheel, and the weight of the lever holds the dog either in operative engagementwith the t ratchet wheel or' disengaged therefrom.

I Other objects of the invention will more clearly appear from the description and claims here'- inafter following.

In the drawings forming a part of this specification, Figure 1 is a front elevational view of the uppe'r portion of ageardriven, power-multiplying hand. brake mechanism, illustrating my improvements in connection therewith, the usual hand wheel shaft being shownin vertical section.

sponding substantially to the line Z- 2 of Figure 17 Figure 3 is a vertical sectional View, corresponding substantially to the line 33 of Figure .2. Figure 4 is a fragmentary view, similar to Figure l, with the front wall .of' the' housing broken partly away, illustrating the parts in'a different position. Figure 5 is a broken, front elevational View of'the housing, showing the bearing member for the driving shaft and rotary trip element. Figure 6 is a view, similar to Figure 1, illustrating another. embodiment of the invention. Figure 7 is a horizontal sectional view, correspondingsubstantially to, the line T-1 of Figure 6. Figure 8 is a view, similarto Figure ,Figurel2 is a horizontal sectional view, corre- 6, showing the upper portion of the housing in vertical section, and the parts of the mechanism in av different operative position. Figure '9 is a view, similar to Figure 5, showing the'housing structure only.

In thedrawings, my improvementsare illustratedin'connection with a well-known type of gear ndriven; power multiplying handbrake mechanism, in' which the usual brake chain is wound, on a brake drum, not shown, rotatable with a relatively large gear, Iii, drivenby a pinion I I, fixed .to a shaft [2,which is actuated in a well-known mannerby the usual hand wheel, not shown, thehub of which is illustrated and indicated by l3. As is common practice, the operating .parts .of the hand brake mechanism areenclosed in, a housing I 4, the upper portion ,go nly of, which is shown in the drawings.

prising a lever actuated,.rotary trip member Referring-first to the embodimentofthe in? r amil str t d n Fi ur 1 i0 5 si improvements comprise broadly a ratchet wheel in rotatable with the pinion II; a pivoted locking "'dlogB; a, trip element C; and an operating lever D forr'nedintegral with the .trip element for actuating the latter. V The ratchet Wheel A and the locking dog B are contained within an upstandin chambe portion 15 ofthe housing I l and the trip element C and operating lever D aremounted exteriorly of t e s n The lockingdog e. whi h. cooperates with as ratchet wheel A is pivotally supported above ar ratchetv wheelon a pivot pin or shaft ltwhich 'extenclsthrough an opening ['1' at the inner end of the dog. v he pivot pin or shaft is is arranged hor izontally inparallelism with. the axis of rotationof the ratchetwheei and hasits opposite ends, flxed in an inwardly projecting bossla on the frontwall Hiof the, portion l5; of the housing, and an inwardly projecting boss 25] on the rear wall 2! of the housing, which rear .wall is in the form of a detachable closure plate,

At the outer end thereof, that is, the end opposite to the pivoted end, the dog B is provided with a teeth 22, cooperating with the lteeth of the ratchet wheel A; Between its ends, at the lower side thereofl the dog B is provided with a laterally projecting l'ug 23 of oval transverse cross sectionwhich extends through an arcuate slot 26 in the front wall 19 of the. housing and'projects some distance .cutwardlybeyond said wall. v r The operating shaft 12 which carries the pinion -l l and the ratchet wheel A extends through the ,front .wall 19 of the housing and has its rear end.

journaledin a bearing boss 25 projecting inwardly from the wa1l2l of said housing. The front end portion ofsaid shaft is journaled in inwardly and outwardly projecting bearing

bosses

26 and 27 on said front wall, the boss 21 being in the form of a .55 tubularv sleeve-presenting a cylindrical exterior to accommodate the usual hand wheel, which is '1 fixed thereto.

The trip element 0, which is integral with the operating lever D. is in the form of an annulus journaled on the boss 21, and is of the exterior contour shown most clearly in Figures 1 and 4. The element C has the handle lever D extending radially therefrom and may be rotated to different positions by swinging movement ofsaid lever. Circumferentially spaced

shoulders

28 and 29 are provided on the element C which cooperate with the lug 23 of the dog B, the lug 23 being in the path of movement of these shoulders as the lever D is swung from side to side. As shown in Figure 4, the shoulder 29 is located on the element C at the inner end of the lever and, when the lever is swung to the left from the position shown in Figure 4 to the position shown in Figure 1, engages the lug 23 to force the dog B into engagement with the teeth of the ratchet wheel, as shown in Fig- To provide for ready application of the element C and its integral hand e lever D to the boss 21, the el ment C is provided with an opening corr s onding in sha e to the lug I28, but of slightly l r er size, so that the lug may pass freely therethrough. In applying the element C and the lever to e o s 21. the lever, together with the element. C. i lac d so that the o ening 30 registers with the lu I2 The el ment C is then slipped over the o s 2 the lug I28 pas ing through the openin 3". a p s tion back of the lug I28, the same is held agai t removal in all os ible positions thereof in which the o enin 30 does not register w th th lu I23. he e ement C. together with the o rat g lever D. is thus effectively locked against removal in all o erative positions, that is, within the extreme limits of swin ing movement of the lev r. as shown in Figures 1 and 4.

The o eration of my improved hand brake me hani m, shown in Fi ures 1 to 5 inclusive. is

as follow In applying the brakes, the ratchet- Wh e is rotated in clockwise direction, as v ewed in i ure l. the do B rat hetin over the teeth of the same. h ing vieldil'lgly held in enga ement with the teeth hv the action of ravitv 0n the dog B and the we g t of the lever D, acting through the shouder 29 of the element C, which shoulder is in en a ement with the lug 23. To release the br kes. th lever D is swun to the right unt l the manually swinging the lever D to the position shown in Figure 4-without sli ht tightening of the After the element 0 has been moved tobrakes. To reengage the dog with the ratchet wheel, the lever D is swung from the position shown in Figure 4 to the left, to the position shown in Figure 1, thereby engaging the shoulder 29 of the trip element C with the lug 23 of the dog, forcing the latter to swing downwardly into engagement with the teeth of the ratchet wheel.

Referring next to the embodiment of the invention illustrated in Figure 6, 7, 8, and 9, my improvements comprise broadly a ratchet wheel E; a locking dog F; a trip element G; and an operating handle lever H formed integral with the trip element for actuating the latter.

The ratchet wheel E is in all respects similar to the ratchet wheel A hereinbefore described and is mounted in thesame manner, being fixed to the driving shaft I2 which also carries the pinion which meshes with the gear through which the brake drum is driven. 'The front end portion of the haft I2 extends through the front wall of the housing, being journaled in a tubular boss 3 I, projecting from said front wall I9. The boss 3I presents a cylindrical, exterior bearing surface on which the element G is rotatably mounted.

The locking dog F is pivotally supported above the ratchet wheel E by a pivot pin or shaft 32 which extends through an opening 33 in said dog. The dog has a tooth 34 at its outer end cooperating with the teeth of the ratchet wheel in the usual manner. On the forward side thereof. the dog is provided with a U-shaped, yokelike porti n 35 which is formed integral therewith and pre ents a pair of depending spaced fingers or arms 36 and the boss 3!, being held in place by the hand wheel, not shown, the hub I3 of which is fixed to the shaft I2. The element G is actuated by the lever H, which is integral therewith. On the inner side thereof, the trip element G is provided with a laterally proiecting cam lu 38 extending through an arcuate slot 39 rovided. in the front wall of the housing I4. The lug 38 operates between the arms 36 and 3'! of the dog F, and when the lever H is thro n to the l ft, as shown in Figure 6, engages the arm 36 to throw the toothed end of the dog into engagement with the ratchet wheel and hold it yieldingly engaged for ratcheting action. As hown in Figure 8, the lug 38 engages the arm 31 when the lever H is thrown to the right to disengage the dog from the ratchet wheel and hold it thus disengaged. The weight of the lev r H mav also be utilized to provide for automat c disengagement of the locking dog by swinging the lever H to the right to a position wherein the lug 38 of the trip element rests against the arm 31 and slightly tightening the brake to relieve the pressure on the tooth of the do whereupon the weight of the lever acts to lift the dog out of engagement with the ratchet wheel.

I claim:

1. In a hand brake mechanism, the combination with a member adapted to be rotated to tighten the brakes; of a ratchet wheel rotatable with said member; a pivoted locking dog element engageable with said ratchet wheel; a lug on said dog eccentric to the pivot thereof; a rotary trip element journaled for rotation about the axis of rotation of said ratchet wheel; a radial lever arm on said trip element, said lever arm being engageable with said lug to force the dog into engagement with said ratchet wheel when the lever is swung in one direction and a radial lug on said trip element engageable with said lug for throwing the dog out of engagement with the ratchet wheel when the lever is swung in a reverse direction.

2. In a hand brake mechanism, the combination with a member adapted to be rotated to tighten the brakes; of a ratchet wheel rotatable with said member; a locking dog pivoted at its inner end and having a tooth at its outer end engageable with said ratchet wheel; a lug on said dog between the pivoted and toothed ends thereof a rotary trip element mounted for swinging movement about the axis of rotation of the ratchet wheel; a radial operating lever on said trip element, said trip element having a shoulder spaced from said operating lever, said lever and shoulder being respectively engageable with opposite sides of said lug to engage the dog with the ratchet wheel and disengage the same therefrom.

3. In a hand brake mechanism, the combination with a housing having front and rear walls; of a rotary operating shaft rotatably supported by bearing means, said bearing means including an outwardly projecting, tubular bearing boss on said front wall within which said shaft is rotatably supported, said boss having an exterior cylindrical bearing surface; a member rotatable with said shaft for tightening the brakes; a ratchet wheel fixed to said shaft; a dog pivotally mounted above said ratchet wheel, said dog hav- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Carney Jan. 20, 1920 Williams Dec. 19, 1922 Burnett Sept. 27, 1932 Kinsman Nov. 13, 1934 Lindeman Mar. 19, 1935 Stolpe Nov. '14, 1939 Dath Sept. 16, 1947 Haseltine Dec. 2, 1947 FOREIGN PATENTS Country Date France Feb. 27, 1909 Number Number