US2594925A - Braking mechanism for lap winding apparatus - Google Patents

Description

April 29, 1952 R. J. HlGGlNBOTHAM 2,594,925

BRAKING MECHANISM FOR LAP WINDING APPARATUS Filed Aug. 8, 1950 2 SI-IEE'IS-SHEET 1 INVENTOR.

R. J. HIGGINBOT HAM 2 ATTORNEY April 29, 1952 R. J. HIGGINBOTHAM BRAKING MECHANISM FOR LAP WINDING APPARATUS Filed Aug. 8, 1950 2 SHEETSSHEET 2 IN VEN TOR. R. J. HIGGINBOTHAM ATTORNEY Patented Apr. 29, 1952 UNETED STATES BRAKINGMECHANISM FOR LAP 'WINDING APPARATUS Robert J. Higginbotham, Charlotte, N. (J.

Application August 8, 195:), Serial No. 178,214

This. invention relates to textile machinery and more particularly to a braking mechanism for: controlling the downward pressure exerted on the calender roll in lap windingapparatus;

In cotton .picking machinery of the typewith which this invention isutilized a web of 'cotton passes between feed; rolls and is received one. calender roll which gradually increases in diameter as the web is wound thereon and this calender roll is supported by the cotton which rests on a, pair of parallel driving rolls. Obviously, as the diameter of the calender roll increases the shaft or axle thereof moves upwardly away from the driving rolls and means must be provided to exert a downward pressure on the shaft to-maintain a tight contact between the cotton and the driving rolls to facilitate the transfer of power thereto.

It has been found that by providing additional braking mechanism to control downward pressure exerted on the roll shaft that the amount of cotton which may be applied to a single roll may be increased by approximately 30 to 50 per cent'above that now commonly wound on the ordinary roll utilizing conventional apparatus. In the conventional apparatus heretofore used, braking means for controlling the downward pressure on the roll shaft has been provided but this has proved insufficient and has not-provided a smooth and even control of such downward pressure as the diameter of the roll increased:- with the application of the cotton thereto. Furthermore, if the downward pressure is not smoothly controlled, frequent breakage of the cotton web is experienced which necessitates splicing or piecing of the web resulting in uneven portions in the roll and also in the loss of time of the machine since an appreciable amount of time is necessary to satisfactorily complete the splice in the cotton web.-

Thepresent invention contemplates the provision of a supplementary braking mechanism which may be applied to existing machines or supplied with new machines and provides a mechanism whereby the downward pressureon the roll shaft may be conveniently controlled, it being noted that this pressure must be varied as the diameter of the-roll increases with the ad-. dition of cotton webbing thereto. The mechanism of this invention utilizes the conventional braking mechanism of the lap winding machine and at the same time utilizes the control pedal provided therewith to operateboth the conventional braking mechanism and the supplemental braking mechanism of this invention.

12 Claims. (Cl.19+162.)

It is therefore an object of this inventionv to provide a braking mechanism .forlap winding machines which may be economically manufactured of readily available materials, which re quires no precision machine work and therefore may be-.produced by relatively unskilled labor.

It is a further object of this. invention to provide a braking mechanism for lap winding apparatus; which may be. conveniently applied to existing machines or which maylikewise betapplied to new machines in' the process of'mamb.

facture. 1

It is a further object of. this invention tom.

synchronize the operation of the same with the conventional braking means supplied with the machine and in which the degree of braking may.

be closely controlled.

Further objects and advantages of the invention will be apparent from the following specification taken in conjunction with the 3.600171! panying' drawings, wherein:

Fig. 1 is-a side elevational view of the braking mechanism of this invention with such parts of the lap winding machine shown as are necessary to illustrate the application and operation thereof; and

Fig. 2, a front elevational view of the mechanism shown in Fig. -1 with certain parts in .section for greater clarity.

With continued reference to the drawing there is'shown a shaft Ii] which serves to support a roll it which roll receives cotton in a form ofwa web l2 thereon. driving rolls l3 mounted on shafts l 1-, rolls 13 being driven and serving to rotate the roll H and shaft H] associated therewith. The web of cotton l2 asit builds up on the roll H rides on the drive rollers I3 which continue to drive the same, the web IZbeing supplied thereto by feeding rolls l5-mounted on shafts l6.

' The roll H and cotton web [2 carried thereby .is maintained, in engagement with the driving.

rolls I3 by a logger head structure I-l whichcom prises-a head It rotatably carrying a roller: [9 which roller engages the roll shaft 10- to resist upward movement thereof as the diameter of the cotton web onthe r011 H increases. The head I8. is secured to a vertically extending and The'roll I! is supported'on slidably mounted rack 20 having rack teeth 2| thereon which mesh with pinion gears 22 mounted on a pinion shaft 23 extending transversely of the machine. Shaft 23 may be rotated to raise or lower the logger heads I! by operation of a hand wheel 24 mounted on the shaft 23 outwardly of the framework of the machine and in a position conveniently accessible to the operator.

Since the diameter of the roll increases as the cotton web l2 builds up thereon, this causes upward movement of the roll shaft l and consequent upward movement of the logger heads I1 and shaft engaging rollers IS, the upward movement of logger heads I! must be controlled in order to maintain the proper downward pressure on the roll shaft I0 and the proper driving engagement between the roll of cotton on the roller I and driving rolls [3. For controlling the upward movement of logger heads I! as the diameter of roll increases, there is provided a braking mechanism which forms the subject matter of this invention.

The braking mechanism of this invention comprises a frame 25 which may include spaced horizontal bars or side members 26 and spaced vertically extending side members 21. The frame 25 is positioned with respect to the lap winding machine by a lower bearing member 28 secured to the frame 26 which bearing engages a transverse shaft 29 mounted in the machine. The lower bearing 28 and frame 25 are securely held in position by a bearing cap 30 secured to the lower bearing member 28 by screw-threaded fastening means or the like 3 I.

The frame 25 is secured to the floor or other supporting structure by screw-threaded fastening means or the like 32 which extend through angle members 33 secured to the horizontal side bars 26 by screw-threaded fastening means or the like 34. The angle members 33 are provided with slots for receiving the fastening means 34 whereby the frame 25 may be adjusted in a vertical direction.

In order to facilitate such adjustment and to level the apparatus with respect to the lap winding machine, there may be provided on the frame 25 a plurality of adjusting screws 35 which are threaded through ears 36 provided on the side bars 26 of the frame 25, the adjusting means 35 further being provided with lock nuts 31 which serve to clamp the same against undesired movement once the apparatus is properly leveled and adjusted. The adjusting screws 35 are intended to engage the upper surface of the floor or other supporting structure and to adjust the height of the frame 25 and associated apparatus in order to properly position the same. Once this adjustment has been made, the lock nuts 31 are securely clamped against the ears 36 and th screwthreaded fastening means 34 are securely tightened to fasten the frame 25 to the angles 33 and thus rigidly support the same on the floor or other supporting structure.

Pivotally mounted on the frame of the lap winding apparatus by a pivot pin 38 is a brake beam 39 having a brake shoe 40 mounted thereon, there being provided on one end of the brake beam 39 a weight 4| which is slidably mounted thereon and securely held in adjusted position by a set screw or the like 42. The opposite end 43 of the beam 39 provides a foot engaging portion whereby the brake beam may be conveniently actuated by the foot of the operator. The transverse shaft 23 of the lap winding apparatus which carries the pinions 22 is provided with a brake drum 44 which may be engaged by the brake shoe 40 on the beam 39 when the beam moves in a clockwise direction, as viewed in Fig. l or, in other words, when the foot engaging portion 43 is in its uppermost position, thus, the brake shoe 40 in engagement with the brake drum 44 provides a braking effect and impedes rotation of the shaft 23 and consequent upward movement of the racks 20 and logger heads I1.

In order to provide additional braking surface and to provide smooth convenient adjustment of the braking effect, an auxiliary braking mechanism including a bar 45 is pivotally mounted at 46 on the upstanding portion 21 of the frame 25. Substantially midway of the bar 45 there is pivotally mounted a brake shoe 4'! having secured thereto suitable brake lining 48 which in its lowermost position engages the brake drum 44 to apply a braking effect thereto. The brake shoe 4! is conveniently mounted by a pivot pin 49 to a clevis 50 which in turn is pivotally mounted on the bar 45 by a pin 5|. The position of the brake shoe 4'! with relation to the bar 45 may be conveniently adjusted by bolts 52 which are threadedly received in the bar 45 on either side of the pin 5|, bolts 52 being provided with lock nuts 53 which serve to retain the same in adjusted position, the heads 54 of the bolts 52 serving to contact the brake shoe 4'! and prevent pivotal movement of the same beyond the desired limits.

The bar 45 is normally urged downwardly to hold the brake shoe 4'! and brake lining 48 in engagement with drum 44 by tension springs 55 which are attached at 56 to the bar 45 by a suitable cross pin extending therethrough. The opposite ends of tension springs 55 are connected to links 51 which in turn are pivotally secured at 58 to bell crank levers 59 which are pivotally mounted at 60 on the frame 25. Each of the bell crank levers 59 is provided with an adjusting bar 6| which extends to the front of the machine and is slidably received in an ear 62 extending from the frame 25. The bars 6| are threadedly engaged by wing nuts 63 which serve to adjust the same and upon tightening of the wing nuts the bars 6| move toward the left, as viewed in Fig. 1, to rotate the bell crank levers 59 in a clockwise direction, thus increasing the tension on the springs 55 and increasing the pressure between brake shoe 4! and brake drum 44.

The brake shoe 4! is applied and released from engagement with the brake drum 44 by means of the beam 39 through a linkage comprising a link 64 pivotally connected at 65 to the bar 45, the opposite end of link 64 being pivotally connected at 66 to a lever 61 which is pivotally mounted at 68 on the upstanding bars 21 of the frame 25. The opposite end of lever B! is pivotally secured at 69 to one end of a turn buckle 10, the opposite end of the turn buckle being secured to a clamp H which engages the beam 39 and may be positioned thereon for proper actuation of the mechanism. Clamp 1| is securely held in position on beam 39 by screw-threaded fastening means or the like 12.

In operation. the brake shoe 40 and brake shoe 41 are disengaged from the brake drum 44 by depressing the left-hand end of the beam 39, as viewed in Fig. 1, whereupon the shaft Ill and roll H are rotated by means of the driving rollers I3 to wind cotton in the form of web |2 thereon. But, prior to the start of the winding operation the logger heads I! are adjusted downwardly so that the roller 9 engages the upper side of "26 on pinion shaft 23 to actua s the logger heads throughpinions 22 and rack teeth 2i. Upon starting the "inding operation the beam iiil is released by the operator to allow the brake shoe 56 and brakeshoe tlto engage the brake drum is, this engagement being caused by the weight ill and the tension springsd pulling downwardly on the outer end of the bar -The relative position of the brake shoe lil and brake shoe 4? may be adjusted by the turn buckle it.

As the roll 6 increases in diameter; due to the cotton'web if applied thereto, the logger heads ll move upwardly which movement is retarded by the braking action on the drum ill, thus providing a smooth and even roll and providing the proper tension in the web it to accommodate the maximum amount of cotton on the roll ll. If desired, during the winding operation the braking effect of the brake shoes and ll may be varied by the operator simply by depressing the beam 39 by engaging the same with his foot at the portion 53. This results in providing a manual control for the braking effect although normally such braking would be accomplished by the weight ii and springs 55 which have been adjusted previously to provide the desired braking action.

It will be seen that by the above described invention there been provided a relatively shnple braking mechanism for lap rolling machines which may be applied to existing machines or supplied with new machines and in which the parts thereof are manufactured from and commercially ecoreadily available material available parts resulting in an extremely nomical device which efficiently operates to provide the des red braking efiect thus riaterially increase the capacity of the winding machine and at the same time provide a much smoother and more evenly wound roll of cotton.

It will be obvious to those skilled in the art that various changes may be made in the invention without departing from the spirit and scope thereof and therefore this invention is not limited to that shown in the drawings nor to that described in the specification but only as indicated in the appended claims.

What is claimed is:

1. For use in a lap winding apparatus includ ing a roll shaft, logger heads for resisting upward movement of said roll shaft and a pinion shaft for controlling movement of said logger heads, a braking mechanism comprising a brake drum fixed to said pinion shaft, a beam pivotally mounted on said apparatus, a brake shoe carried on said beam and movable into and out of engagement with said brake drum, a weight adjustably mounted on said beam adjacent one end thereof for moving the same to engage said brake shoe with said brake drum, a frame secured to said apparatus and to an adjacent supporting surface, means for adjustably positioning said frame with respect to said apparatus and for fixing the same in adjusted position, a bar pivotally mounted on said frame and overhanging said brake drum, a second brake shoe pivotally mounted on said bar and movable into and out of engagement with said brake drum, adjusting means on said bar for limiting pivotal movement of said sec- 0nd brake shoe with respect thereto, a tension spring connected to one end of said bar and exerting a force to bias said second brakeshoe toward said brake drum, a bell crank lever pivotally mounted on said frame, a linl: connected to the opposite end of said spring and said bell crank lever, a rod connectecl'to said ball crank lever and extending through an ear on said frame, a wing nut threadedly receivedon said rodand engaging said ear whereby uponrotaill tion of the same said rod will be'movedlongitudinally to vary the tension of said spring and thus vary the braking pressure of said brake shoe, a lever pivotally mounted on saidfr'ame, a link connecting the opposite end of said bar and said lever and a turn-buckle connecting said lever and said beam whereby upon pivotal move ment of said-beam said brake shoes will be moved toward or away from said brake drum,

the relative braking effect of said brake shoes being correlated by adjustment of said turn buckle.

'2'. For use in a lap winding apparatus including a roll shaft, logger heads for resisting upward movement of said roll-shaft and a pinion shaft for controlling'movement of saidlogger eads, a braking mechanism-comprising a brake drum fixed to said pinion'shaft; abeam pivotally mounted'cn said apparatus, a'brake shoe carried said beam and movable into and-out of engagement with said brake drum, a weight adjustably mounted-on saidbeam' adjacent-one end thereof for moving the sa meto engagesaid brake shoe with said brake drum, a frame, means for adjustably-positioning said frame with respect to said apparatus'and for fixing-the same in adjusted position, a bar pivotally-mounte l onsaid frame and overhanging said-brake drum, a second brake shoe pivotallymounted on said bar and movable into and out of engagement with brake drum, adjusting means on said. barfor limiting pivotal movement of said second brake shoe with respect thereto, a tension spring'connected to one end of said bar and exerting a force to bias said second brake shoe toward said brake drum, a bell crank lever pivot-ally mounted on said frame, a linkconnesting the opposite end of said spring and said bell cranklever, a rod connected to said'bell crank lever and extending through an ear on said frame, a wing nut threadedlyreceived on saidrod and engaging said ear whereby upon rotation of the same said rod will be named longitudinally tovary the tension of said'sprin and thus vary the braking pressure of said second brake shoe, a lever pivotally mounted on said frame, a link connecting the opposite end of said bar and said lever and a turn-buckle connecting said lever and said beam whereby upon pivotal movement of said beam said brake shoes will be moved toward or away from said brake drum, the relative braking effect of said brake shoes being correlated by adjustment of said turn-buckle.

3. For use in a lap winding apparatus including a roll shaft, logger heads for resisting upward movement of said'roll shaft and a pinion shaft for controlling movement of said logger heads, a braking mechanism comprising a brake "drum fixed to said pinion shaft, a beam pivotally mounted on said apparatus, a brake shoe carried by said beam and movable into and out of engagement with said brake drum, a weight adjustably mounted on said beam adjacent one end thereof-for moving the same to engage said brake shoe with said brake drum, a frame, a bar pivotally mounted on said frame, a second brake shoe 'pivotallymounted on said bar and movable into and out of engagement with said brake drum, adjusting means on said bar for limiting pivotal movement of said second brake shoe with respect thereto, a tension spring connected to one end of said bar and exerting a force to bias said second brake shoe toward said brake drum, a bell crank lever pivotally mounted on said frame, a link connecting the opposite end of said spring and said bell crank lever, a rod connected to said bell crank lever and extending through an ear on said frame, a wing nut threadedly received on said rod and engaging said ear whereby upon rotation of the same said rod will be moved longitudinally to vary the tension of said spring and thus vary the braking pressure of said second brake shoe, a lever pivotally mounted on said frame, a link connecting the opposite end of said bar and said lever and a turn-buckle connecting said lever and said beam whereby upon pivotal movement of said beam said brake shoes will be moved toward or away from said brake drum, the relative braking effect of said brake shoes being correlated by ad justment of said turn-buckle.

4. For use in a lap winding apparatus including a roll shaft, logger heads for resisting upward movement of said roll shaft and a pinion shaft for controlling movement for said logger heads. a braking mechanism comprising a brake drum fixed to said pinion shaft, a beam pivotally mounted on said apparatus, a brake shoe carried by said beam and movable into and out of engagement with said brake drum, adjustable means engaging said beam for moving the same to engage said brake shoe with said brake drum, a frame, a bar pivotally mounted on said frame, a second brake shoe mounted on said bar and movable into and out of engagement with said brake drum, a tension spring connected to one end of said bar and exerting a force to bias said second brake shoe toward said brake drum, a bell crank lever pivotally mounted on said frame, a link connecting the opposite end of said spring and said bell crank lever, a rod connected to said bell crank lever and extending through an ear on said frame, a wing nut threadedly received on said rod and engaging said ear whereby upon rotation of the same said rod will be moved longitudinally to vary the tension of said spring and thus vary the braking pressure of said second brake shoe, a lever pivotally mounted on said frame, a link connecting the opposite end of said bar and said lever and a turn-buckle connecting said lever and said beam whereby upon pivotal movement of said beam said brake shoes will be moved toward or away from said brake drum, the relative braking effect of said brake shoes being correlated by adjustment of said turn-buckle.

5. For use in a lap winding apparatus including a roll shaft, logger heads for resisting upward movement of said roll shaft and a pinion shaft for controlling movement of said logger heads, a braking mechanism comprising a brake drum fixed to said pinion shaft, a beam pivotally mounted on said apparatus, a brake shoe carried by said beam and movable into and out of engagement with said brake drum, adjustable means engaging said beam for moving the same to engage said brake shoe with said brake drum, a frame, a bar pivotally mounted on said frame, a second brake shoe mounted on said bar and movable into and out of engagement with said brake drum, a tension spring connected to one end of said bar and exerting a force to bias said second brake shoe toward said brake drum, a bell crank lever pivotally mounted on said frame, a link connecting the opposite end of said spring and said bell crank lever, a rod connected to said bell crank lever and extending through an ear on said frame. a wing nut threadedly received on said rod and engaging said ear whereby upon rotation of the same, said rod will be moved longitudinally to vary the tension of said spring and thus vary the braking pressure of said second brake shoe, a lever pivotally mounted on said frame, a link connecting the opposite end of said bar and said lever and adjustable means connecting said lever and said beam whereby upon pivotal movement of said beam said brake shoes will be moved toward or away from said brake drum, the relative braking effect of said brake shoes being correlated by adjustment of said last-named adjustable means.

6. For use in a lap winding apparatus, logger heads for resisting upward movement of said roll shaft and a pinion shaft for controlling movement of said logger heads, a braking mechanism comprising a brake drum fixed to said pinion shaft, a beam pivotally mounted on said apparatus, a brake shoe carried by said beam and movable into and out of engagement with said brake drum, adjustable means engaging said beam for moving the same to engage said brake shoe with said brake drum, a frame, a bar pivotally mounted on said frame, a second brake shoe mounted on said bar and movable into and out of engagement with said brake drum, a tension spring connected to one end of said bar and exerting a force to bias said second brake shoe toward said brake drum, a bell crank lever pivotally mounted on said frame, a link connecting the opposite end of said spring and said bell crank lever, means to vary the position of said bell crank lever, whereby the tension of said spring may be adjusted to vary the braking pressure of said second brake shoe, a lever pivotally mounted on said frame, a link connecting the opposite end of said bar and said lever and adjustable means connecting said lever and said beam whereby upon pivotal movement of said beam said brake shoes will be moved toward or away from said brake drum, the relative braking effect of said brake shoes being correlated by adjustment of said last-named adjustable means.

7. For use in a lap winding apparatus including a roll shaft, logger heads for resisting upward movement of said roll shaft and a pinion shaft for controlling movement of said logger heads, a braking mechanism comprising a brake drum fixed to said pinion shaft, a beam pivotally mounted on said apparatus, a brake shoe carried by said beam and movable into and out of engagement with said brake drum, adjustable means engaging said beam for moving the same to engage said brake shoe with said brake drum, a frame, a bar pivotally mounted on said frame, a second brake shoe mounted on said bar and movable into and out of engagement with said brake drum, a tension spring connected to one end of said bar and exerting a force to bias said second brake shoe toward said brake drum, means to vary the tension of said spring, a lever pivotally mounted on said frame, a link connecting the opposite end of said bar and said lever and adjustable means connecting said lever and said beam whereby upon pivotal movement of said beam said brake shoes will be moved toward or away from said brake drum, the relative braking effect of said brake shoes being correlated by adjustment of said last-named adjustable means.

8. For use in a lap winding apparatus, includ ing a roll shaft, logger heads for resisting upward movement of said roll shaft and a pinion shaft for controlling movement of said logger heads, a braking mechanism comprising a brake drum fixed to said pinion shaft, a beam pivotally mounted on said apparatus, a brake shoe carried by said beam and movable into and out of engagement with said brake drum, adjustable means engaging said beam for moving the same to engage said brake shoe with said brake drum, 3, frame, a bar pivotally mounted on said frame, a second brake shoe mounted on said bar and movable into and out of engagement with said brake drum, adjustable means engaging said bar to bias said second brake shoe toward said brake drum, a lever pivotally mounted on said frame, a link connecting said bar and said lever, and adjustable means connecting said lever and said beam whereby upon pivotal movement of said beam said brake shoes will be moved toward or away from said brake drum, the relative braking effect of said brake shoes being correlated by adjustment of said last-named adjustable means.

9. For use in a lap winding apparatus including a roll shaft, logger heads for resisting upward movement of said roll shaft and a pinion shaft for controllingmovement of said logger heads, a braking mechanism comprising a brake drum fixed to said pinion shaft, a beam pivotally mounted on said apparatus, a brake shoe carried by said beam and movable into and out of engagement with said brake drum, adjustable means engaging said beam for moving the same to engage said brake shoe with said brake drum, 2. frame, a bar pivotally mounted on said frame, a second brake shoe mounted on said bar and movable into and out of engagement with said brake drum, adjustable means engaging said bar to bias said second brake shoe toward said brake drum, and adjustable means connecting said bar and said beam whereby upon pivotal movement of said beam said brake shoes will be moved toward or away from said brake drum, the relative braking effect of said brake shoes being correlated by adjustment of said last-named ad- J'ustable means.

10. For use in a lap winding apparatus including a roll shaft, logger heads for resisting upward movement of said roll shaft and a pinion shaft for controlling movement of said logger heads, a braking mechanism comprising a brake drum fixed to said pinion shaft, a beam pivotally mounted on said apparatus, a brake shoe carried by said beam and movable into and out of engagement with said brake drum, adjustable means engaging said beam for moving the same to engage said brake shoe with said brake drum, a frame, a bar pivotally mounted on said frame, a second brake shoe mounted on said bar and movable into and out of engagement with said brake drum, adjustable means engaging said bar 10 to bias said second brake shoe toward said brake drum, and means connecting said bar and said beam whereby upon pivotal movement of said beam said brake shoes will be moved toward or away from said brake drum.

11. For use in a lap winding apparatus including a roll shaft, logger heads for resisting upward movement of said roll shaft and a pinion shaft for controlling movement of said logger heads, a braking mechanism comprising a brake drum fixed to said pinion shaft, a beam pivotally mounted on said apparatus, friction means carried by said beam and movable into and out of engagement with said brake drum, adjustable means engaging said beam for moving the same to engage said friction means with said brake drum, a frame, a bar pivotally mounted on said frame, a second friction means mounted on said bar and movable into and out of engagement with said brake drum, adjustable means engagin said bar to bias said second friction means toward said brake drum and adjustable means connecting said bar and said beam whereby upon pivotal movement of said beam both of said friction means will be moved toward or'away from said brake drum, the relative braking effect of said friction means being correlated by adjustment of said last-named adjustable means.

12. For use in alap winding apparatus including a roll shaft, logger heads for resistin upward movement of said roll shaft and a pinion shaft for controlling movement of said logger heads, a braking mechanism comprising a brake drum fixed to said pinion shaft, a beam pivotally mounted on said apparatus, friction means carried by said beam and movable into and out of engagement with said brake drum, adjustable means engaging said beam for moving the same to engage said friction means with said brake drum, a frame, a bar pivotally mounted on said frame, a second friction means mounted on said bar and movable into and out of engagement with said brake drum, adjustable means engaging said bar to bias said second friction means toward said brake drum and means connecting said bar and said beam whereby upon pivotal movement of said beam both of said friction means will be moved toward or away from said brake drum.

ROBERT J. HIGGI NBOTHAM.

REFERENCES (JITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 279,626 Williamson et a1. June 19, 1883 643,295 James Feb. 13,- 1900 715,060 Hain Dec. 2, 1902 1,105,281 Langston July 28, 1914

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