USRE15302E - rundle - Google Patents

Description

F. A. BUNDLE. COMBINATION AUTOMATIC AND LOWERlNG BRAKE FOR HOISTLNG MACHINES.

APPLICATION FILED DEC.1 6 [92K- Reissued Mar. 7, 1922. 15 ,302,

2 SHELIS-SHEET I.

A m a F. A. R'UNDLE.

COMBINATION AUTOMATIC AND LOWERING BBAKF FOR HOISTING MACHINES.

APPLICATION FILED DEC.IG, 1921.

Reissued Mar. 7, 1922; r 15,302.

2 SHEEISSHEET 2.

UNITED STATES PATENT OFFICE.

FRED A. BUNDLE, OF LOCKHART, FLORIDA, ASSIGNOR 'IO WRITING CORPORATION, OF HARVEY, ILLINOIS, A CORPORATION OF ILLINOIS.

COMBINATION AUTOMATIC AND LOWERING BRAKE FOR HO ISTING MACHINES.

Specification of Reissued Letters Patent.

Reissued Mar. 7, 1922.

Original No. 1,153,957, dated September 21, 1915, Serial No. 788,456, filed Kay 19, 1913. Application for reissue filed December 16, 1921. Serial No. 522,918.

To all whom it may concern:

Be it known that I, FRED A. BUNDLE, a citizen of the United States, formerly residing at Harvey, Illinois, now residing at Lockhart, in the county of Orange and ,State of Florida, have'invented a certain new and useful Combination Automatic and Lowering Brake for Hoisting Machines, of which the following is a specification.

Where a hoisting machine, such as those employed for controlling the spout of ore docks is used, it is very important that they shall automatically lock against any tendency of the load to descend, but shall be under the full control of an operator when it is desired to actually lower the load.

The invention relates to hoisting devices of this class, and its object is to o control the hoisting mechanism. 4

The invention consists in a combination of brakin devices, one automatic, the other manna y operated, the former being released as the latter is brought into use.

More in detail, the invention consists in the use of band brakes combined in the manner described and still more in detail in the specific features hereafter set forth in the specification and the claims.

In the drawings, in which similar numerals indicate the same parts throughout the several views; Figure 1 is a plan view of one form of hoisting mechanism having the preferred form of this invention applied thereto. Figure 2 is asectional' detail view of the hand brake showing those parts which lie, between the lines 2 and 3 of; Figure 1. Figure 3 is a sectional side view taken on t e line 3 of Figure 1, showing the automatic rake. Figure 4 is an end view of the two brakes combined looking at them from the left hand end of Figure 1. Figure 5 is a sectional detail view of the brake pul- 'ley, showing the details' of one form of com- ,bined brake and wheel to which this invention is applied.

The particular hoisting mechamsm here lan viewin Figural, is revided with side frame members 10. an 12 secured by bolts ,14 toany suitable foundation or other baseQ/Journaled in bearings; 16 in ther'side ia-a mainline shaft 18 arallel to which is ashortshaft 20 carried in bearings 22 in the-side frames These two' shafts 18 and 20 are connected together i by a pair of suitably proportioned gears 24 and 26 and rotate in unison. On the shaft 20 ust lnside one bearing of 22 is a pinion 28 meshing with a gear 30 on a shaft 32, also ournaled in the side frames. This pin- 10n 28 is rigidly secured to the sleeve 29 to which the brake pulley 42-44 is also rigidly secured by key 31 or other suitable means. The sleeve is of course, loose on the shaft. Near the opposite end of this shaft 32 is a plnion 34 meshing with a gear 36 on another shaft 38, also journaled in the side frames. Rlgldly secured to this shaft 38 is a Winding drum 40 on which a rope, chain or the like, not shown carrying the load to be lifted is wound or unwound, as the case may be.

The problem solved by this invention is to perfectly control the load suspended from drum 40 when the lifting power is taken off from shaft 18 and this is accomplished by mechanism which will now'be described.

Loosely mounted on the shaft 20 between the bearings 22 is the sleeve 29 which carries the two band brake wheels 42 and 44. In the particular case here illustrated, these wheels are integral with each other, but

these details are entirely immaterial, the

onl requirement being that they both be rigidly connected together.

Around the wheel member 42 is placed a flexible brake band 48 of ordinary construction, having one endrigidly attached adjusting nuts 60 to a pivot 62 in one end of a lever 64 pivoted at 66 on a suitable supporting bracket 68. On the o posite endof lever 64 is a'counterweight 0 adapted to normally swing the lever 64 in a counterclockwise direction thereby moving the free end 56-48 of the brake band upward, as

viewed in Figure 2, and thus releasing the band from frictional contact with the wheel 42. This counterweight engages base 54 as shown in Figure 2 which thus acts as a stop.

Rigidly secured to the lever 64 by any suitable means, such for instance as the casting.72 and the bolts 74, is hand lever 75 adapted to be manipulated bythe operator to rotate lever 64 in, a clockwise direction against the action of counterweight 70, to. thus, at will, tighten up the brake band 48.

From the foregoing it will be seen that when the device of Figure2 is left to itself,

the counterweight 70 and the hand, lever 75 will, in the manner described, release brake as viewed in Figure 2, he can, just as gradually as he desires, tighten the brake band 48 upon the wheel and thus accurately-control through the agency of this device any load Which may be carried from the drum 40.

Similarly, inclosing the wheel 44 is another brake band 78, having its opposite ends connected to a lever 80pivoted on a suitable bearing 82 carried by a bracket 84.

- distance between theknife edge 98 and the The two bea- ringsgor pivots 66 and 82 are concentric with each other or more properly lie in the same line so that when desired, the two levers 75 and 80 canrotate in unison about the same central axis. I

Extending from the hub 86 of'the lever SOis a relatively short lever arm 88 to which one'end of the/brake band 78 is attached, the effective length of the lever being from hand 94 to the center of bearing idly connected to the opposite end of the brake band 78 is a transverse bearing pin 90 on which is journaled a rod 92, preferably passing through a slot' 94 in the opposite portion of the band 78. The outer end'of the rod 92 is connected by a bolt 96 to a knife edge 98 on a lever 100 longer than the lever 88, whose effective length is the center of 82. The end 91 of band 94 stops against lug 93 on base 95.

'It will be noticed that the two lever arms 88 and 100 are of different lengths with reference to the point of attachment of the brake band and yet rotate about the same center 82, with the result that when the hoisting machine rotates the wheel or pulley 44 in a clockwise direction, as viewed in Fig. 3, the band is automatically tightened uponthepulley and the pulle 44 is therefore, stopped and locked, wher as, when the pulley 44 is rotated tin' ra counterclockwise Hdirection, as viewed iri'Fig; 3, the lever 100 ing the band; The result of this construc--. ption isthat this device automatically locks ,thepulley when it tends to rotate in clock-, ",wis directiom-but can be releasedby the is pulledjtoward the pulley, thereby releaso'perator shoving the lever 80 toward the ooj vpulleyywhereas, on the other hand, when the pulley tends to rotate in a counter, clockwise 'directiomthe band-'78 willbe released. In other words,nthis device just described serves the" purpose of automatically checking the descent of any load upon the drum 4Q ,load tendingto normally rotate the pulley 44- in a clockwise: direction) unless the 82." Big operator releases lever 80; that is, moves it toward'the pulley.

This device just described, which will be hereafter referred to as the automatic brake or braking device, therefore automatically locks the hoisting machine against descent of the load and it might be supposed that by the operators carefully moving the lever 80 to the right, as viewed in Fig. 3, he could thus gradually release and consequently regulate the descent of the load with sufficiently accurate control, but as a matter of fact, this is not practical, because the arc of movement of the lever 80 between locked position of the band 78 and completely released position thereof is too short to effect accurate control of the -load,. particularly under different conditions of lubrication, dampness and rust of the variousparts as found in working practice. It is for this reason that the more direct and gradually acting hand brake of Figure 2 is supplied adjacent to the automatic brake, and in :or-

, der that the operator may conveniently and automatically handle the two brakes at once, a projecting lug or finger 102 is 'rigidly connected to some part of lever 75, as for instance the member 72 and extends over into the path of travel of and engages lever 80 on the bearing plate 104. a

The result of the foregoing construction is that, when the parts are; assembled in the position shown inthe drawings and the tensions of the twobands 48 and 78 are prop- ,erly adjusted by the nuts 60 and 96, and

then the operator moves lever 5 to the right, as viewed in Figure 2, he, in so doing, moves lever 80 to the right and thus releases the automatic brake and simultaneously brings into operation the handbrake of Figure 2 which becomes more andgnore effective as he increases the pressure u on the lever'75 to the right, as viewed in igure 2. When, on the other'hand, the operator releases lever 7 5 the counter weight 70 rotates lever 75 to the left and thus completely releases the hand brake band 48 and also releases the automatic brake from the control of this lever '75, with the result that the automatic brake is left to operatejust as though the hand brake device were not present; that is to say,automatically' locking the wheel 44 whenever the load tends torotate that wheel in a clockwise direction and automatically releasing itself and consequently the wheel 44 whenever power is applied to the mechanism to rotate the shaft 20 in a counter clockwise direction, i.-- e., when ralsplace, the hand lever 110 is man pulated to it may be explained that shafts 18 and 20 a are continuously rotatedby power and when lifting of'the load on drum40 is to take move clutch 112 into engagement with the end of pulley 44. Lever 110 of course mor'ed in the opposite direction to throw off the power and at this time the automatic brake takes hold as described.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a device of the class described, the combination of a shaft, a pair of rigidly connected pulleys on said shaft, a brake band on one of said pulleys, means for automatically operating said brake to prevent rotation of said pulley in a given direction, a second brake band on the other of said pulleys. a lever for applying said last mentioned brake band, and means operated by the said lever for releasing the automatically controlled brake band.

2. In a device of the class described. the combination of a shaft, a pair of rigidly connected pulleys on said shaft, a brake band on one of said pulleys, means for automatically operating said brake band to prevent rotation of saidpulley in a given direction, and permitting a free rotation of said pulley in the opposite direction, a second brake band on the other of said pulleys, a hand lever for applying said brake band, and means carried by said lever for releasing the automatically controlled brake band.

In Witness whereof, I have hereunto subscribed my name in the presence of two Witnesses.

FRED A. RUN D'L-E.

lVitnesses EVA L. BUNDLE, R. B. Kim.

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