US1532877A - Automatic brake for straight-lift elevators - Google Patents

Description

April 7, 1925. 1,532,877

H. J. BUCK AUTOMATIC BRAKE FOR STRAIGHT LIFT ELEVATORS Filed Aug. 0, 1919 3 Sheets-Sheet 1 April 7, 1925.

H. J. BUCK AUTOMATIC BRAKE FOR STRAIGHT LIFT ELEVATORS s Sheets-Sheet 2 Filed Aug. 0 1919 April 7 1925; 1,532,877 H. J. BUCK AUTOMATIC BRAKE FOR STRAIGHT LIFT ELEVATORS Filed Aug. 30, 1919 3 sheets sheet 5 I 1322207202 amps #62 2224 Z5246 A X Patented Apr. 7, 1925.

UNITED STATES PENNSYLVANIA.

HERMAN JOSEPH BUCK, 0E ELLWOOD CITY, PENNSYLVANIA, ssIGNoR r0. MATHEWS CONVEYER COMPANY, 0E ELLWOOI) CITY, PENNSYLVANIA, A CORPORATION OF AUTOMATIC BRAKE FOR STRAIGHT-LIFT ELEVATORS.

Application filed August 30, 1919. Serial No. 320,858.

To all whom it may concern:

Be it known that I, HERMAN J. BUCK, a citizen of the United States, residing at Ellwood City, county of Lawrence, and State of Pennsylvania, have invented certain new and useful Improvements in Automatic Brakes for Straight-Lift Elevators, of which the'following is a specification.

This invention relates to' improvements in automatic'brakes designed especially for use in connection with automatically operated straight lift elevators of the general type disclosed in Letters Patent of the United States issued to me May 6th, 1919, No. 1,302,631. v,

In elevators of this type articles or packages are usually automatically delivered to the carriages or platforms on the up-side of the elevator, and'automatically discharged therefrom on the down-side of the elevator. It is a frequent occurrence that more carriages on the down-side than on the up-side will be loaded. The preponderance of load conveyed by the descending carriages will tend to accelerate the speed of the elevator. This is particularly true where the elevator is driven by a motor which has a tendency to increase its speed when the load acts with it, i. e., when the motor does not function as a generator as is the case with certain types of motors. In the employment of this improved brake, friction is only applied when it is necessary to counteract the increased speed due to unequal load distribution, or to stop the elevator immediately upon the cessation of the power actuation. This invention provides an improved automatic brake to arrest movement of the elevator not only when the power is intentionally shut off, but also when there is an accidental interruption in the power transmission.

It is the object of my present invention to provide automatic means for controlling,

' under such conditions, the speed of the elevator, although the mechanism may be applied to other types of elevators without departing from my invention.

The invention consists gene-rally in the constructions and combinations hereinafter described and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification:

Figure l is a side elevation of the upper part of an elevator having my invention applied thereto, I

Figure 2 is an end elevation of the same, j

Figure 3 33 of Figure 2,

Figure 4 is a' sectional elevation, partly broken away, on line 4- 4 of Figure3, looking in the direction of the arrows.

Figure 5 is a similar view, on line 5''5 of Figure 3, looking'in the direction of the arrows.

Figure 6 is a detail section of. one of the,

brake members, I

is a horizontal section on line Figure 7 is an elevation of the driving shaft upon which thebrake members are located, partly broken away, and showing one brake member'in section on the shaft,

Fig.8 is a view similarto' Fig}- 3' showing the brake disks in engagement with the stationary brake plate,

Fig. 9lis a vertical'section on line 9.9 of F ig, 8 looking in the direction of the ar row with a portion of the pinion and one of the brake members partly broken away. In the drawings, 1 represents a portion of the frame-of an elevator of the general type illustrated in my Patent No. 1,302,631, here-- inbefore referred to. 2represents the driving shaft mounted in bearings 3 and 4, upon broken away, is also shown in'Figures l and I 2. The elevator carriages are secured to and supported by the elevator chains 8.

Theelevator shaft 6 is driven from the shaft 2, through a pinion 10, gear 11', pinion 12, and a gear 13 mounted on said shaft 6.,

The pinion 10 is mounted loosely on the v shaft 2. This pinion is secured to a brake disc member 14: (see Figure 6) having an I internal screw thread 15, a friction surface '16, and a projecting lug '17. I An oppositely. acting brake disc member 18 (see Figure 7) provided with a friction surface 19, is secured upon a sleeve 20 that fitting the internal threads in the mem ,22 arranged to coact with thelug 17 on is mounted upon" the shaft This sleeve is provided with external screw threads 20 ber 14. I A spline'21 connects'the sleeve 20 andthe shaft2 and causes-thesleeve and brake member to rotate with the shaft. The brake member '18 is provided with a lug the brake member 14; I

' A stationary brake plate 23 is arranged 'between the two brake discmembers 14 and 18,being'providedwith an opening through which the shaft 2 and the sleeve-2O extend, andthrough which-opening the lugs-17 and 22 von the brake disc members contact with each other. The brakeplate23 is mounted brake disc members normally are both out.

upon, suitable studs 24, securedsto the elevator frame, andusprings 25' on-said studs? plate'out of contact with normally hold said the member 18. .7 I 7 The; arrangement of theparts as assem bled is shown in Figure 3. The disc mem ber 14 .is screwedonto the sleeve 20. The

of contact with the. brake plate 23. y

The screw-threads- 15 in the brake member 14, and thecorresponding threads 20 on the sleeve 20- extend in a direction corre sponding to r the directionof -movement of theshaft 2. For instancein Figure 1 the belt pulley 5 and shaft 2 are indicated by ment ofthe parts will be reversed nd-nor 7 mal conditions will be restored. The brake member 18 will'move fasterthanthefbrake and come in contact with'.thellug'l'l. "This faster movement 1 of the brake member 18 will, through the screw thread connection between said" member I and the member f 14'; cause-the brake members. 14. and 18: to' sepiai.

rate, and thetrain of gears beginningiwith pinion-10 will be rotated fromsthe shares} at normal speed. The brake mechanismwilli be brought into action as often,. and only as often as the elevator runs or moves" faster than the speed normallyfimparted to it from. its driving mechanism. Whenever the elevator does exceed its normal speed jthe 'brakef device will immediatelywbe brought into'ac 3, 6 and 7of the drawings,

tionary. and-the brakefplate'23 to be clamped the arrow as turning from left to right, and the th-reads;15 -and120 mustin this instance be right handthreads, as shown in-Figures tion andwill check such speedpermitting'f the elevator to run at all times onlyat sub stantially. normal speed, Similarly,-when the, power is cutoff or the beltlruns-ofl' th e driving pulley, this" novel automatic brakewill immediately 1 function i to. stop the" ele' -f,

vator. a

v I do not limit myself to the In operation, assuming the parts to be stabetween the members 1 4 and 18, upon-applicationof power to the pulley 5 toturn said pulley andt-the shaft 2 in the direction indicated by the arrowon Figure 1, thedetailsfof con particulars withoutdeparting froinmyinstructionas the same may be varied in many 105.

member 18, beinglsplined to theshaft 2 will turn with said-shaft, and as-the' pinionlO and=brake member 14 are held stationary, by; engagement with the elevator-gearing, the sleeve 20 will move away, from the plate 23,

I itsthreads 20 screwing out-of the threads 15 inthe member 14a sufiicient distance to cause the brakemembers to release plate 23.

. The brake member-14 and thepinion 10 will remain-stationary during this movenentof the brake member 18 until the said member 18, has made a partial revolution with the shaft 2' and the lug 22, on said brake member, has in' the revolution of'said member, been: brought in contact with the lug 1701'Ltl16-ab1'f1k8 member 14. The brake member 14 and -pinion-il0 will thereafter continue to rotate with the shaft 2 andthe train of elevator gearing will be driven from said shaft 2, through the brake member 18, lug 22, lug 17, brake member 14 and pinion 10, and-this will continue so long as the elevator operates in a normal-manner.

Should the down side of the elevator be vention: g t

' I claim as my invention: t 1. The combination, with a, driving shaft, of a pinion loosely mounted" thereon, gear; ing connected with and'drivenby said-pinion, means connecting said'shaft with said pinion for driving said pinion from said shaft, saidmeans being arranged to permit the r pinion to exceed the speed imparted" to it by .said'shaft, a brakemechanism con nected with said pinion,.and means bring 'ing said brake mechanism intooperation when the speed of the pinion, exceeds't'he speed normally imparted to itvby said driv ing shaft,- and to stop saidpinion when the application of power to said drivin'g shaft is interrupted or discontinued. p

v 2. Thecombinatiomin an elevator driv ing mechanism, ofa driving shaft; :a pinion mounted loosely thereon, a brake member connected with said pinion, a brake member splinedupon said shaft, said brake members being provided with .means causing one member to be driven from the other, a'sta tionary brake-plate arranged between said brake-members, and means causing said brake members to grip said plate when the speed of said pinion exceeds the normal speed imparted to it by said shaft, and to stop said pinion when the application of power to said driving shaft is interrupted or discontinued,

3. In an elevator driving mechanism the combination,. with a driving shaft, of a pinion mounted loosely thereon, a stationary brake plate, oppositely acting brake memhers arranged upon opposite sides of said plate, means causing said pinion to be driven from saidshaft, and means causing 15 said brake members to grip said, plate when the pinion turns at a speed greater than that normally imparted to it by said shaft, and to stop said pinion when the application of power to said driving'shaft is interrupted 20 or discontinued. I

In witness whereof I have hereunto set my hand this 23rd day of August, 1919.

HER-MAN J OSEPH BUG-K.

Witnesses:

CLARA HENNON, REGINALD R. MILLER.

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