US1968210A - Brake for winding drums - Google Patents

Description

`uly 31,1934. R. E. KLINE BRAKE FOR WINDING DRUMS Filed May 21, 1929 3 Sheets-Sheet 1 En E W WNW; NW w jm; l l :whim m NN U --\1| NNI NNN l Mlm HMI@ v www? Nxl\ l @nl @Nl Q mm1 i A mm1 QN ||F m@ QN w f .NUMA Nwwv E WN ||I @mx NKY .r .MMX @N ,h m@ m m www o. WN .IIIWQN l. h f2, mw .EMN

July 31, 1934. R. E. KLINE l BRAKE FOR WINDING DRUMS Filed May 21, 1929 3 Sheets-Sheet 2 Jul/ 31, 1934. R. E. KLINE 1,968,210

BRAKE FOR WINDING DRUMS Filed May 21, 1929 3 Sheets-Sheet 3' JMU/f? eg.

Patented `Iuly 31, 1934 1,968,210 BRAKE Fon -WINDING DnUMs PATENT@maeffi Richard .'E. K lin'e, Los Angeles, Calif;, assignolgu l v by mesne assignments, to OilWell Supply Company, Pittsburgh, Pa., ya vcorporationof New f i Y Jersey Application May 21,1929; seriarnofsemas This invention hasto do generallywith brake devices, andA relatesk more particularly to drum brakes vespecially adapted foruse onwin'ding drums for hoists', 'draw-Works, oil drilling equipment', or the like. The brake structure embodied in thefinvention is Vdesigned primarily withthe View of providing for winding drums,l and other devices including the combination of arotatabledrum and a brake band around y'the' drum, a highly effective means fortensioning the brake band about the drum arranged in a manner such'as to apply a portion of the band as a brake shoe. A further object of my invention' is to "permit maximum brake area oi `the b an'dto beutilized.' The invention is characterized primarily by the particular manneriin which theband'is applied to the drum in effecting the braking action, this manner being such that the bandnot only isbroughttobear tightly against `the drumbut, in addition, to bejtensionedfin, the direction of rotation of the drurnin such a way that the drum itselfaids in tensioning the band. The :band is applied to the drum in such away that Aits bear# ing surface or lining is subjected to even Wear; and as a vprovision for preventing unnecessary wear "or dragging whenV not in use, tlie'jband is maintained out o feng ag ementwith the drum when thebrake idles.'v Y s j.

In orderrto accomplish effective. brake action in the manner describedJ have provided at the movableor fr eeend of 'the' band, the other end of the band being normally held. stationary, a toggle connection with suitable actuating means. As a result of the action ofv the toggle, ftheband not only is vdrawn circumferentially'-about the drum, but the free' end ofthe-band 'is urged against the' :drum with suiiicient force 'to cause said free end to 'be irictionally .held bythe drum, the latter, by virtue of itsV rotation, drawing the band 'tightly about itself. Thefparticular con'- struction and operation oithey invention` will be understood most readily .and clearly from the following detailed description, reference being had throughoutthe description to the annexed drawings, in'which: .v l

l is a front elevation of a conventionally illustrated drumequipped with the present brake device;` r' H Fig-2 is 'ani-"enlarged left lend elevation of Fig. l, the brake being shown in released' posilEig. 311s ak view similar toaFig. 2- showingthe brake applied .to-theY drum;

brake band. It will beiapparent that,withthe s a resting against the Fig. 4is an lenlarged fragmentary View of a bandanchor post; and

Fig. 5j is a part elevational and a-part sectional view taken on the ybrokenlinefof Fig. 3. 1n the preferred embodiment of my invention and as'shown 'in the drawings; the brake means are shown in duplicate, although it will be undere stood lthat a single brake means may be'applied to numerous types of drums'other thanthe one 'shown. 'vf' InA the drawin'gsa horizontally disposedwindy ing drum 10 is employed. This drum is supported by mearsfof @Suitable framework, the vf.1afif1v0l including upright-,s Y11 interconnected by means of the crossmember 11a. ',TrunniQns-12 Aof the drum are j'ournaled in bearings 13 mounted on the uprightsand the drumfis adapted to berotated bysuitable' drivemeans, for instance, the coni/ erii tionally illustrated geardrive 14. Drum'lO i s pr'vv videdwith enlargedj`cylindricalends or brake flanges 10a, each constituting a brake drum and provided with brake bands 15. i -'A sfshown in Fig. 2, the brake b and' 15 lbastan integral lining 15a and its end 16 is pivotallyfanchored by vmeans of a 'vertically adjustable post 1'7. (The free end l8"of the bandisjireeto move circumferentially about thedrum and Yis v'connected to the brake operating lever 19 throughthe toggle mechanism, generally indicated at 20. jThe bandis yieldably supported at anA intermediate point 21'from the frame cross member 11a by means of the Aspring suspension 2 2. This suspension device embodies a strip 2 3 suspended# from saidcro'ss member, a'tube'24- carried by the strip, and through whichthe shank ofv a hook25' eX- tends. 'Tube 24 carries va spring126',and 2'7-is a vertically movable washer in the tube resting onthe upper end of the spring to enable'the spring to vyieldably supporthook 25 and, thereforathe brake releasedv as in Fig/2,v the band is raised from positiononthe rbrake-drum orflange by means ofthedevice 22, Ythereby preventing undue .wear'of the lining 15er'.Y As will later beseen, when the toggle' device 2 0is in releasedfposition, there 100 is no appreciable bearing of the brake bands drum around its lower periphery@A j As previouslymentioned, the fixed end 1 6 ofthe band isfpivotallyfanchoredto the upper. end "of post 17. As illustrated thejoint therebetween eml 4a horizontal pin 2 8 releasably held jby"s'e t screw 29 in thev enlarged head 17a ofthe post', the 'center of the band'being 'out away to'receivesaid head portion andl'ooped toform eyes :through which pin"28 extends. The lower end of the v`post 1'10 is contained within a vertical sleeve 30, the latter having an annular flange 30a on its lower end disposed within an opening 31 formed in the under face of a block 31a. The sleeve is held in the block against vertical displacement, and the latter in turn is secured to the platform or oor F by means of bolts 32. The post is threaded through a nut 33, integral with the upper end of the sleeve, and is held in vertically adjusted position by means of a lock nut 33a. Thus, by having the post adjustable as described, the free end 16 of the band may be positioned as desired relative to the toggle 20, thereby providing for regulating the thrust of the toggle in urging theb-and radially against the brake-drum. l

The brake operating lever 19 as illustrated is integral with a horizontally extending crank shaft 19a, the latter extending substantially parallel,

with the axis A of the drum and preferably near the base of the sleeves 30. As particularly shown by Fig. 1, the crank shaft extends the length of the drum 10, and, as will later be seen, serves to simultaneously actuate the brakes by tensioning the brake bands on each of the brake flanges 10a This shaft is journaled at its respective ends in saddle boxes 35 bolted to the floor F, and has crank arms 18h, one pair designed for cooperation with each of the toggles 20. Each pair of crank arms comprises one element of the toggle, an offset pivot in the form of a pin 36 being carried by each pair of crank arms to constitute a toggle joint.

A plate 37 is fastened on the free end of the ,ba-nd 15 and is shaped on each side to provide a pair of oppositely disposed bosses 37a drilled to receive pin 38. A link 39 is pivotally connected to plate 37, the arm 39a of the link terminating in bosses 39h drilled to receive the pivot pin 38. The link is also pivotally connected to the offset crank ,pin 36 by means of a removable strap 40 extending around said pin and secured to the link by bolts 4l.

It will be seen that by anchoring the fixed end of the brake band at a point P substantially in vertical tangential alinernent with the drum, and with the free end of the band terminating at a point intermediate the bottom B of the drum and the point P of tangency of said xed end, said free end, by positioning the crank shaft near the collar or sleeve 30, may closely approach the xed end. Thus, the band practically surrounds the .drum with the advantage that maximum brake area is provided.

It is assumed the direction of rotation of the drum is that indicated by arrow R and that the toggle, through lever 19, is moved from the position of Fig. 2 to that of Fig. 3. Because of the characteristics of the toggle action, the free end of the band is caused not only to move circumferentially relative to the drum in the direction of Vrotation thereof, but also to be urged radially irrward against the drum with sucient force to frictionally engage the drum. Obviously, the frictional engagement of the free end-of the band with the drum serves to cause the band to be tightly drawn throughout its extent into engagement with the drum, and against the `tension of .the suspension device 22, by virtue of the rotational force of the drum. In addition, one component of the thrust imparted by the toggle is tangential to the drum. By thus making use of y the momentum of the drum in tensioning the vbrake band, the latter obviously may be tensioned to a much greater degree than would be possible by mere tangential thrust alone on the free end of the band.

As previously mentioned, the effect of the toggle in producing radial thrust of the band against the drum may be varied by vertically adjusting post 17 and, therefore, end 16 of the band, the eifect being that the position of the latter relative to the drum is changed, and that the position of link 39 is varied accordingly. Thus, assuming post 17 to be lowered, the free end of the band moves about the drum in the direction of arrow S and the link 39 is swung counter clockwise. It will be apparent that by actuating the toggle in this position, the radial thrust imparted to the band through said link is increased by virtue of the adjustment and that the frictional engagement of the band with the drum is correspondingly increased, the result being that added rotational force of the drum is harnessed in tensioning the bands. By raising instead of lowering the post, added tangential thrust of the band by the toggle obviously is effected at the expense of its radial thrust.

Upon releasing the brake to such positions that the band extends loosely about the drum, the intermediate portion of the former is raised from engagement with the drum by virtue of the action of spring device 22, thus preventing wear of the brake lining. The lower portion of the band is sufliciently released from engagement with the drum to prevent dragging and unnecessary wear of the lining when the brake idles.

It will be understood that the drawings and description are to be considered merely as illustrative of and not vrestrictive on the broader claims appended hereto, for various changes in design, structure and arrangement may be made without departing from the spirit and scope of said claims.

I claim: C

1. A brake device comprising a rotatable brake drum, a brake band for the drum, anchoring means for one end of the band, said anchoring means being adjustable to permit shifting of the band circumferentially about the drum, and operating means joined to the free end of said band, said means comprising a link freely pivoted between the band and said operating means and arranged within the angle between the brake band and a line normal thereto at the pivot between the link and the band so that a pushing force on said link is transmitted to said band with radial and tangential components, and means for applying a pushing force to the link to tension the band around the drum.

2. In a device of the character described, the combina-tion of a rotatable brake drum, a brake band surrounding Vsaid drum, anchoring means for one end of the brake band, said anchoring means being relatively stationary during actuation of the brake band, and operating means joined to the free end of said band comprising a pushing element pivoted to the brake band and arranged within the angle between the brake band and a line normal thereto at the pivot of the pushing element and the band to apply a pushing force having a component toward the brake drum, and means for pushing said element, said anchoring means being adjustable to permit shifting of the band circumferentially about the drum to vary the angle of incidence of the pushing force.

3. In a device' of the character described, the combination of a rotatable brake drum, a brake band surrounding said drum, .operating means for the brake band, and ia relatively stationary support for said operating means, one end of said brake band being anchored to said support, said operating means comprising a crank shaft rotatably mounted on said support and a link connecting a crank of the crank shaft and the free end of said band, said link being arranged within the angle between the brake band and a line normal thereto at the pivot of the link and the band.

4. A brake device comprising a rotatable brake drum, a'brake band surrounding said drum, a vertically adjustable post for anchoring one end of the brake band, a spring for freeing the band from said drum when the band is released and operating means pivoted to the free end of said band, said means comprising a crank shaft, a link pivoted to a crank of the crank shaft and pivoted to the free end of said band, said link being ar-Y ranged within the angle between the brake band and a line normal thereto at the pivot between the link and the band, and means for rocking saidl crank shaft.

5. In apparatus of the character described, a horizontal rotatable drum, a brake band for said drum, adjustable anchoring means for one end of said band arranged in upward tangential alignment with the drum, a free end of the band terminating at a point intermediate the bottom of the drum and the point of tangency of said fixed end, actuating means for said brake band and a link pivoted freely between the free end of said band and a. moving part of said actuating means within the angle between the brake band and a, line normal thereto at the pivot point of the link and movable freely between said moving part and said end of said band to transmit to said band end a pushing force having radial and tangential components.

RICHARD E. KLINE.

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