US691276A - Elevator apparatus. - Google Patents

Description

No. 69I,276. Patentesd lain. I4. |902.

C l KTTJEN.- ELE'vATYon APPARATUS.

, (Applicgtion led Nov. 4z 1899.) (No Model.) *Y 1 2 Sheets-Sheet l.

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" no. 691,276. Patented 1an. I4, |902.

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ELEVATUR'APPABATUS.

(Application lsd Nov. 4, 1.899,) (no nodal.) 2 sheets-snm 2.

ma@ A UNITED STATES PATENT OFFICE.

CARL KTTGEN, OF CHARLOTTENBURG, GERMANY, ASSIGNOR TO SIEMENS dt HALSKE ELECTRIC COMPANY OF AMERICA, OF CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

ELEVATOR APPARATUS.

SPECIFICATION forming* part of Letters Patent No. 691,276, dated January 14, 1902. Application tiled November 4, 1899. Serial No. 735,810. (No model.)

To all whom, it may concern:

Be it known that I, CARL KTTGEN, a subject of the Emperor of Germany, residing at Charlottenburg, Germany, have invented a certain new and useful Improvement in Elevator Apparatus, (Case No. 244,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specilo fication.

My invention relates to elevator apparatus, and more particularly to that class of elevator apparatus known as hoisting apparatus, although Ido not wish to be limited to x5 the precise apparatus in which the invention may be employed.

My invention relates particularly to that class of elevator apparatus in which sheaves are employed for transferring power from zov motors to the elevators, this arrangement being preferable to drums, which have to be of inordinate sizes when the extent of travel of the eievators is great, it having frequently been necessary to wind two or more layers z5 of rope around the drums in order to have drums of a sufficiently-reduced diameter to be practicable. This arrangement is very objectionable, as the wear upon the rope is great, the life of the rope being consider- 3o ably shortened thereby. vThe employment of sheaves is an improvement in this respect in that the rope does not have to be rapidly wound about the same; but there are many serious objections to the practical use of 3 5 sheaves, among which may be mentioned the fact that it is very difficult to secure sheaves of exactly the same diameter, so that where a plurality of sheaves are employed to secure the necessary friction undue strains are ex- 4o erted upon the rope, which are difficult to counteract and provide for. This harmful eect is due to the fact that the plurality of sheaves for operating a single rope are driven by a single prime mover, the prime mover obviously being incapable of rotating the sheaves at different rates of speed.

I will point out my invention in the claims. In practicing the same I employ a plurality of driving-sheaves about which a single rope 5o is passed, the sheaves having frictional en gagement with the rope to drive the same, and a prime mover associated with each sheave, which prime mover may be adjusted to accommodate its speed to the diameter of the particular sheave driven thereby, so that even though the sheaves be of slightly-different diameter the rope Wound about the same will not be subject to the strains heretofore exerted thereon.

I will explain my invention more particularly by reference to the accompanying drawings, in which- Figure l is a diagrammatic view representing apparatus of the prior art in elevation. Fig. 2 is a plan view of parts shown in Fig. l. Fig. 3 is a diagrammatic view showing apparatus in elevation equipped in accordance with my invention. Fig. 4 is a plan View of the apparatus shown in Fig. 3. Fig. 5 is a perspective view of a modified form of my inventon. Fig. 6 is a perspective view of still another form of myinvention. Figs. 7 and 8 are plan views of the 'apparatus shown in Figs. 5 and 6.

Like parts are indicated by similar letters of reference throughout the dierentgures.

In Figs. 1 and 2 I have illustrated the apparatus of the prior art comprising a single prime mover a, a plurality of driving-sheaves b b, driven by the same prime mover a, and an operating-rope c, passed about the sheaves b b, as shown, to secure the desired friction, and carrying upon its ends the elevator cars or buckets d d, the end portion of the rope c being passed over idler-sheaves c e. If the sheaves b b should be of the same diameter, the apparatus may work satisfactorily for a time. If, however, the grooves in the sheaves should wear unevenly, the rope will be Wound about one sheave faster than about another sufcientl y to cause injurious strains to be exerted upon the rope. The precise mechanism shown in Figs. 1 and2 for driving the sheaves b b by the same prime mover consists in a link f, connected with the pitman of the prime mover (in this case a steamengine) and uniting the cranks secured to the shafts of the sheaves.

In Figs. 3 and 4t I have shown independent roo prime movers g g, (in this instance in the form of steam-engines,) the pitman of each prime mover being connected with a crank of the corresponding sheave. The operatingrope c is likewise passed over idler-sheaves e e and carries at its ends the elevator-cars d d. The relative diameters of the sheaves b b, which are connected by the cable or rope in tandem with the construction shown in Figs. 3 and 4, is not so important as with the construction of the prior art, (shown in Figs. 1 and 2,) as each prime mover may be adj usted to the rate of speed necessary to secure the desired Erictional engagement and application of the power to the voperatingrope. While I have shown steam-engines in the apparatus illustrated in Figs. 3 and 4, I may employ other forms of prime moversfor example, such as are indicated in Figs. 5, 6, '7, and 8.

In Figs. 5 and 7 I have shown a construction wherein the prime movers g g may be 'in the form of inductionmotors directly -coupled with the sheaves b b, about which the operating-rope c may be passed. In the apparatus shown in Figs. 5 and 7 an idler-sheave e may be employed, about which the rope may be passed, the rope also lpreferably carrying at its ends the elevator cars or buckets d d.

Power, however, may be applied to the sheave e, as in the apparatus illustrated in Figs. 6 and-8. In the arrangementillustrated in Figs. Gand 8 the frictional engagement between the rope c and the sheave e is approximately twice that between the said 4rope and either of the sheaves b b. This being the case, rotary 'eort may be applied through the agency of a prime mover or prime movers h having the necessary capacity to rotate the sheave with the requisite power. The sheaves e are preferably diagonally disposed with relation to the sheavesbb in the apparatus shown in Figs.

5, 6, 7, and S in order that the ropes may be properly directed in their travel from one sheave to another.

`While I have diagrammatically illustrated an apparatus constructed in accordance with myinvention, Vthe mechanical details of construction will be readily apparent to those skilled in the art. I do not wish to be limited tothe precise features of construction shown; but

Having thus described my invention, I

claim as new and desire to secure by Letters Patent- 1. In an elevator apparatus, the combination with a continuous operating-rope, of an elevator-car having fixed engagement with the rope, a plurality of sheaves for driving the rope and connected thereby in tandem, and prime movers, one for operating each driving-sheave, substantially as described.

2. In an elevator apparatus, the combination with a continuous operating-rope, of an elevator-car having iixed engagement with the rope, two sheaves for driving the rope and connected thereby in tandem, prime movers, one for operating each driving-sheave, and a third sheave e, about which said rope is also passed, substantially as described.

3. In an elevator apparatus, the combination with a continuous operating-rope, of an elevator-car having fixed engagement with the rope, two sheaves for driving the rope and connected thereby in tandem, prime movers, one for operating each driving-sheave, and a third sheave e, about which said rope is also passed, the said sheave e being diagonally disposed with relation to the aforesaid sheaves, substantially as described.

4. In an elevator apparatus, the combination with an operating-rope, of an elevatorcar having xed engagement with the rope, two sheaves for driving the rope and connected thereby in tandem, prime movers, one for operating each driving-sheave, the prime movers exerting driving force upon the rope in the same direction, a third sheave e, about which said rope is also passed, and a third prime mover for rotating the sheave e, substantially as described.

5. In an elevator apparatus,` the combination with two sheaves, of a rope passing about the same to secure the necessary friction, a prime mover for driving each sheave, a third sheave e about which the said rope is also passed, the said sheave c being diagonally disposed with relation to the sheaves b b, and a third .prime mover for rotating the sheave e, substantially as described.

In witness-whereof I hereunto subscribe my name this 14th day off October, D. 1899.

.CARL KO'ITGEN.

Witnesses: Y WOLDEMAR HAUPT, HENRY HAsPER.

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