US83725A - Charles r - Google Patents

Description

tiene @anni CHARLES R. TIS AND NORTON P. TIS, OF YONKL'ERS, NEW YORK.

Letters Patent No. 83,7 25, dated November 3, 1868 IIVIPROVEMENT 1N HOISTING-APPARATUS.

The Schedule referred to in these Letters Patent und making part of the same.

To all icltom, tt may concern:

Be it known that we, (inmunes R. O 'rrs and Non- 'rON l?.` Oris, both of Yorkers, in the county of West -end elevations'of a hoisting-apparatus constructed according to our improvement, and g Y Figure 3 represents a partly sectionalrear elevation Y or view, at right angles to iig 1. of the same.

Similar letters of referance indicate corresponding parts throughout the several iigures,

The leading feature or object of our invention is the running of hoisting-apparatus at what may be termed rapid velocity', without obiectionable noise-an important consideration where the same is designed for hotel -use and other purp0ses. To accomplish this, we employ endless screws, working-in worm-wheels at opposite ends or sides of the drum, to divide or equalize wear; and the nature of our invention consists in coupling said screws or their shafts togetl1er,by means of strap or belt, and Connecting the worin-wheels, which they serve to drive, with the hoisthig-drum, through interposed ratchet or spring-attachments, or both, wherehythe workis divided between the two screws,

thus reducing strain and wear, and which, owing to the almost unavoidable slipping of the beit, and other causes, itis impraoticable to attain otherwise.

Referring to the accompanying drawing, Areprcsents the' hoisting-drum, which is here supposed to be y fast to its shaft, a, that issupported and works in suit.

able bearings, l1. B is the hoisting-rope or chain, and

C the pulley over which the same is passed, to connect with the platform 'of the apparatus.

To illustrate the dierent means that may be einployed, either separately or concerted, in carrying out our improvement, the drum A is shown as driven at one end, through the interposition of springs, S, and atlits other end through a ratchet-wheel, R, and pawl or pawls, the action of which devices is hereinafter de-V scribed; but so far, as the principle of operation is conce1-ned, a spuug-attachment may be substituted for the ratchet, or a ratcheteattachment for the spring.

D D' are driving-pulleys, set in motion by any suit# able means, and coupled by belt or strap, G, that may be kept taut by a tightening-pulley, H. The pulleys l) Doarry on their shafts c c' endless screws E l", ananged to gear with' and drive worm-wheels llA F', which, by means of sleeves or otherwise, are loosely v hung on the drum-shaft a. The ratchet-wheel R -is connected with the one worm-wheel F, and gears with fthe drum by or through a spring-borne pawi or pawls,

d, while the other worm-wheel, F', is connected with the drum through thesprings S, carried by said wheel acting on or in connection with studs e, projecting from or made fast to the drum.

f From this description it will be perceived that screws being employed as drivers, and belt and pulleys being used in the place of spur-gear to operate them, a comparatively noiseless action is secured, but, as the motion derivable from screws is naturally slow, it becomes necessary, in order to give the requisite speed to the hoisting-drum, that the pulleys which operate the screwsshould be rotated at a very high Velocity, in accomplishing which the belt that couples said pulleysis apt, occasionally, to slip on one or other of the latter,

by reason of adierence inthe smoothness or biting-y condition. oi their peripheries, or from other causes. This has the eect of throwing all the work upon the screws, but by themeans we interpose to connect the .worm-wheels with the drum, such eiect is neutralized', and the work divided between the two screws, so as to reduce strain and wear. Thus, by the application of the springs S and ratchet-wheel R, for instance, supposing, in hoisting, the wheel F to run the fastest, then the ratchet-wheel R takes the lead in driving, causing increased compression of the springs S, which .resist-ance is felt or transferred through the wheel F to the' screw E, that operates the latter, and thus the strain or wear is divided between the two screws, while,

ii' the wheel F run the fastest, the springs S take the lead in driving, and are extended, causing the ratchetwheel R to slip the pawl or pawls d, till the action of the springs causesa division of the strain. It may be preferred to dispense withthe ratchet-attachment, and employ ,springs at both ends, or no springs, and ratchets at both ends of the drum, in which latter case, and by a suitable disposition of the pawls, theworm-wheel that actsvas a' driver in hoisting 'will lag in lowering, and thus the wear upon the screws be divided, the one bearing the strain in hoisting, and the other in the reverse motion of the drum. It is preferable, to secure a sensitive adjustment of the interposed driving-at tachments, that either one of the pulleys D D should be slightly of larger diameter than the other.

What is here claimed as new, and desired to he secured byLetters Patent, is-

The combination, with the hoisting-drum, of screws `operated through pulleys, by a belt or band coupling ments, or either, substantially as specified.

CEAS; R. OTIS. NORTON P. OTIS.

YVitnesses:

M. M. VAIL, `Minor Winslow.

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