US1306803A - Brake-operatistcr - Google Patents

Description

C. C. CREWSON.

BRAKE OPERATING MECHANISM. APPLICATION FILED ocT. I9. 1916.

1 ,306,803. Patented June 17, 1919.

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BRAKE OPERATING MECHANISM. APPLICATJON FILED ocr. 19. 1916.

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Patented June 17, 1919.

CHARLES C. CREWSON, OF KANSAS CITY, MISSOURI.

' BRAKE-OPERATING MECHANISM.

reoesoa Specification of Letters Patent. Patented line 1'7, 1919.,

Application filed October 19, 1916. Serial No. 126,611.

To all whom it may concern Be it known that I, CHARLES C. CREWSON, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Brake-Operating Mechanism; and I do declare the followingto be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, Which form a part of this specification.

My invention relates to a brake mechanism and particularly a device of this char-- or the like, the principal object of the invention being to actor for use on railway cars,

eflect the braking or releasing of the carv from a position and in a manner to obviate injury to the operator.

In accomplishing this object I have provided improved details of structure the pre ferred forms of which are illustratedin the accompanying drawings, wherein Figure ped with brake actuating mechanism constructed according to my invention.

Fig. II is a plan view of the winding parts of the mechanism.

Fig. III is a side View of the same, one of the drum and roller supporting brackets being broken away for better illustrating the locking pawls.

Fig. IV is a similar view with the parts in released position.

Fig. V is a vertical section on the line V-V, Fig. II.

Referring more in detail to the draw ings: p

1 designates a railway car of ordinary construction comprising trucks 2, a brake actuating rod 3, roof 4, and foot board 5.

Mounted on the car roof 1 is a windin mechanism 6, comprising a base plate 7 which carries the winding drum and operating lever later described and which preferably extends beneath the foot board 5 to provide a substantial anchorage for the mechanism and to locate the mechanism in a convenient position for a brakemanto operate.

Extending vertically from the base plate 7 at its exposed end, are spaced standards 89 and revolubly mounted therebetween on a pin shaft 10 carried thereby is a wind- I is a side elevation of a car equip ing drum 11, having an integrally cast or otherwise attached ratchet wheel 12 at its inner end, whereby the drum is revolved; the said drum being tapered outwardly from the wheel 12- and provided with a spiral groove 13 whereby a chain or cable wound thereon may be prevented from crowding or overlapping itself.

Spaced from the standard 9, forwardly of the drum 11, is a standard 14, and pivotally mounted on a pin 15 carried by the standards 14 and 8, is a pawl 16 comprising a detent tooth 17 adapted for engagement with the teeth 18 of the ratchet wheel 12 to prevent unwinding of the drum, and a weighted arm 19 thatis rearwardly in the direction of the ratchet whereby the tooth 17 is urged into engagement with the ratchet wheel to normally preventunwinding of the drum 11.

Revolubly mounted which lies closely adjacent the base 7 and is provided with a spiral groove 22 having the same lead as that on the drum 11 in order that, as the. brake operating cable later described is unwound from, or wound on the drum, the cable be guided across the roller without binding and will also be held in close proximity to the car roof.

- Pivotally mounted on the shaft 10 adj accnt the ratchet wheel 12 and within the standard 9 is a winding lever 25, comprising a forwardly extending handle arm 26 and a shorter, rearwardly extending arm 27, the latteradapted to engage a boss 28 extending from the inner face of the standard 8 to limit the rearward movement of the winding lever.

Pivotally mounted in the lever arm 26 is a pawl .80 having a tooth 31 directed toward and adapted, when the winding lever is actuated, for engaging the ratchet wheel 12 to actuate the winding drum, and also comprising a downwardly directed arm 32 having afoot 33 which seats, when the lever 25 is in normal position, against a shoulder 3 1 in a forwardly directed arm 35 forming a part of the pawl 16; the pawls being so mounted that when the lever 25 is in normal horizontal position (Fig. III) the tooth 17 of the pawl 16 will engage the ratchet wheel 12 to prevent the drum from unwinding, and the pawl tooth 31 will be held from engage ment with the ratchet by the lower pawl arm 82. a

The arm 35 extends forwardly from the on a shaft 20 carried V by the standards 14 and 9 is a roller 21,

pawl 16 and projects slightly beyond the iousing whereby, when desired, the pawl tooth 17 may be rocked from engagement with the ratchet wheel 12 otherwise than by the automatic method provided, and which is later described.

Adjacent the larger end of the drum I provide a hook or cye'37 and attached thereto is a flexible connecting member, such as achain 3Swhich-is adapted for winding or unwinding. from the drunr asthe latter is revolved, and whiclrextends beneath the roller 21,.over sheave wheels 39-4O at the endv of the car and about a sheave'wheel 41 at the end'of the brake rod 3 and is suitablyattachedat its end totheend of the car, so that as the chain iswvound onthe drun'rthe brake rod will be drawn forwardly to cause the brake levers and beams (not shown): to perform their. function;

By so taperingthe vvinding drum and at.- tachiug thechain at the larger endt-hereof itwill be seen that the-slack of the ohaini is more quickly talten up at the: start ofthe operation andl greater leverage-is-provided astl1e=cliai1r nears the end of the drum,. so that the brake may be set more effectively. 7

' Assuming the winding: mechanisnnto be so constructed and achain attached thereto and. running over the sheave wheels 0111 the car and brake rod as shown toset thebrake air operator moves the lever arm 26 upwardly from its normal horizontal positiiom (Fig: I II). As the lever is raised the pawl arm 32 is released from the shoulder in the pawl 35, allowing the tootlr 31 to drop into engagement" with: the teeth 18015 the ratchet wheel 12,. and the drum 1:1 carried along with the lever arm and the chain wound thereoir.

When the lever26 hasbeen' carried to its limit the operator may return it to normal position, but the drum is prevented from re turning by the engagement of the pawl: tooth 17 with the ratchet, the said tooth being urged against the ratchet by the weigl ited' arnr 19. The operator may then repeatthe operation until the cable has been drawn sufliciently tight to effect the brake: operation,

Then the lever arm is in norn'lal position, it will be noted that the pawl arm 32 seats against theshoulder 34: of the pawl arm 35, and the tootlr 17 seats in the ratchet surface of the wheel 12 to prevent an unwinding of the drum.

In order to release the brake mechanism the operator presses downwardly on the lever arm 26', so that the arm 32, seatingagainst the pawl arm 85, will rock the latter downwardly and cause the tooth 17 tobe unbrackets to' provide astep 36- seated from the teeth 18, so that the drum is released and the chain may be unwound therefrom to release the brake. The unwinding may however, be stopped at any time by raising the lever slightly to allow the pawltooth 17 to again engaget'he'ratchet wheeh 1 If it is desired the operator may hold the tooth 17 disengaged fromrthe ratchet wheel l2-by pressingdownwardly on the step 36, so that by'drawingon the lever 26 he may more accurately judge the tension on the brake chaiir and have immediate control of the winding: drum to stop the car more accurately.. I

lVhile I have specifically mentioned the use of my improvements in connection with railway cars, it is apparent that they are adaptable for dump wagons or othen vehicles, as well as to any" mechanism on devicewhereimpressure is;- to be exertedor relieved int the general manner herein disclosed. .v 3 v I't-will be seen that by so constructing the mechanism, by use of a single lever, the brakercllaiirn'iay'bewound: on: the drum, or unwound therefrom, and the drum may be locked or released: at thewillr of the operator.

Havingzthus described my invention: what I claim as new therein and' desire to secure by Letters-Patent isz- A brake mechanism, comprising a horizonta'l.'dlann'provided with ai ratchet wheel rigid with the-same;:a1 forwardly extendinglever, apawl *pivotally mounted on the lever and having a: tooth directed toward and movable by the lever-into engagement with the teeth of the ratchet to actuate the winding drum, 100 the opposite end of the pawl forming a dbwnavardly clirer'zted' depending foot and a ratchet detent' pawl pivotally mounted in vertical alihement with the said pawl in ad vance of the ratchet and provided with an 10 5 inner upwardly and rearwardly extending tooth to engage the ratchet and havinga depending weighted arm; said 'detent pawl being also provided with a forwardly eXtendingarmhaving an outer projecting trea-dle 11 portion located below the said lever, the in nor portion of-th'e forwardly projecting arm o'f'the detent pawl being provided with a re cess arranged; to receive the depending foot of the pawl of the lever to permit the lever 115 to rocl'rthe detent pawl outof engagement wit'l'i'tllre ratchet when the said lever is swung to the limit of its downward movement, said weighted'arm being arranged for causing the detent pawl to engage theratchet wheel 120 when the lever is swung upwardly.

' In testimony whereof I afiiX my signature.

-CHARLES C; CREWSON.

Copies of this patent may be obtained for five cents each,'by addressing the Gomm-i'ssi oner of Patents, Washington, 17:10.1 i

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