USRE4751E - Improvement in elevators - Google Patents

Description

BEST AVAILABLE COPY M. HAN'FORD.-

Improvement in Elevators.

Reissued Feb. 13,1812.

i l l g orsnspensories wound aboutoneormored ruins,

i carriage, and is stationary or does not move tln-rewith. l-lerctolbre all the hoisting mechand all this weight it has been inwessary to ele- BEST AVAILABLE COPY UNITED STATES PATENT OFFICE.

lllELANC'IllUN UANFORI), OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN ELEVATORSl Specification forming part.- of Letters Patent N 0. 99,433, dated February 1, 1870'; reissue No. 4,751, dated February 13, 1872.

To all to lehom flit-represents shall come: instance, an -elevator in which the carriage Beit lulownthat I, MELANC'IIION IIANFORD, thereof is raised and lowered by two ropes, each of Boston, in the county of Sull'olh and 0mm wound upon anddclivered fromadrumof equal lnonwealt-h o1'- illassuehnsetts, have made an capacity, eachdrum beingmounteduponashatt invention ot'a new and useful Elevator for carrying a worm-gear, which meshes into one Iioisting Goods or Articles of Various Kinds; of two worms a-flixed to and revolving with a and do hereby declare the following to be a shaft common to the two, the screws being of full, clear, and exact description thereoi', due 1 equal pitch, but the pitch of the one sloping reference beinghad to the awcompanyiugdraw- I ina direction opposite to that of the other. ing making part of this specification, and in In the drawing above referred to as accomwhicl pan ying this specification and which illustrates Figure 1 is a plan,'and Figs. 2 audit side do my inventioina denotes an uprightframe,comvations of my invention. posed of two side posts or guides, b b, and a My present improvements relate to a class transverse bar or head, 0, the former servin of elevators i'or hoisting human beings, meras guides to the hoisting carriage on platform,

chandise, &-c., by the use of one or more ropes shown at d, these parts being constructed and disposed after the manner of many elevators now in-use. In carrying out my invention, I dispose, preferably upon opposite sides of thei'rame a, two revolving d1l1llIS,0 e, which are mounted upon shafts ffsupported in suitable standards 9 g, two hoisting-ropes, It It, being confined at one end to each drum, and having their opposite ends carried about suitable rollers, t t t, &e., and secured to opposite ends of the actuating power of the drums being two or more worms and worm-gears, the threads of the worm being arranged in opposite directions, and the threads of the gears into which they respeeti vel y mesh being correspondingly formed. My invent-ion maybe stated to consist, lirst, in the combination, with the elevator-c:irriage, of two or more screws or wormsapplied to one common shaft, a pa-rt being let't and the othc centers, being swiveled to an oscillating crosshcad, I, pivoted at its center to the central line of draft of the upper cross-bar m of the carriage (l, as shown at a. To the inner extremity of each shaft], and in front of its standard, I atiix a worm-gear, 0, while below each worm-gear, and meshing into it, I dispose arcvolvingworm, :,thetwo worms beiu g, in turn, mounted upon a long horizontal shaft, q, the ends ofsuch-shaft being mounted and revolving in boxes 1' r suit ably fixed to standardss s, erected in the immediate vicinity of the standard 9', and so that re ground lloor, entirely independent of the the shaft g shall stand at right angles to the ,rria-ge, and I thereby etfect a great savin gin shafts ff, it being observed that the worms are e power required to elevate the latter; and right and left worms, bywhich means th ears s invention further consists in the employand drums are rotated in opposite directions.

to actuate the hoisting mechanism, when the said worm or screw shalt is independent of the anism, including the gears, shafts, &e.,' have been mounted upon and carried by thccarriage,

yatc with the carriage, with, of course, an ex- )enditnr l of considerable power. Under my wention this machinery may be located on one of two lateral bars, k k, such bars, at their.

at. when desirable, of two oppositely-dis- The shaft q is to be provided with reversible ed drums or sets of rums, operated by fast pulleys and a loose pulley and belts in Ms or worms, to coilup or deliver t-hcsusmanner well understoodby mechanics, by which ories at equal rates, in order to obtain an the direction of rotation of the" shatt may be aseof power and relieve the mechanism reversed, and the elevator-carriage raised or elevator in general from the one-sided lowered, or its movements arrested at pleasure.

which otherwise devolves upon it. The revolution of the shaft, by means of its lescribing the nature and construction of worms, as will be at once understood, will revention I have adopted, in the present volve the gears 11 p, and, by winding theropes 2, BEST AVAILABLE COPY will be left to perform, to a certain extent, the

applied to the shaft in the other, isexerted'in' upon the drums, elevate or lower the carriage, and its frame, by the arrangement of the duas the case may be, according to the direction plicate drums and light and left worms, I r in which they travel. duoe the amount of power required to drive the To obtain symmetry of parts and uniihrmity same.- in action, I prefer that the two sets of drums, screws, worm-gears, &c., should he oounterparts of each pther in form and disposition, as herein shown. This arrangement, however, though desirable, is not arbitrary, as I should otherwise obtain similar results, provided each tionary hearings, unattached-"to and not movum was driven at the same peripheral raing with the said carriage, a portion of the pidity. worms being right and a portion left threaded The arrangement of the right and left worms, to operate in connection with worm-gears of taken in connection with the hoisting-drums corresponding pitches to actuate the hoisting and their gears, secures the following importmechanism, substantinllyas herein shown and an advantages: One advantageofsuchduallydescribed. arranged worms and gears, in addition to the 2. In mechanism for operating elevator-carmcreased bearing-surface ofscrew-threads and riages, the employment of two or more oppogear-tecth obtained, will be seen in the addisitely-arranged drums, provided each with one tional means of safety they afford, since, if one or more hoisting-ropes or suspensories, and actof such worms or gears should fail, its fellow uated by-worms and worm-gears or their equivalents, for purposes stated.

3. The general arrangement and combination of the carriage d and its frame, the drums e e, mounted and provided with the gears o o, as explained, and the worms p p mounted upon the shaft q, the lat-ter'being provided with reversiblcfast pulleys, and with a loose pulley and belts, and the whole arranged and operating as hereinbefore set forth. contrarydirections, and with equal foroenpon 1 MELANCTHON HANFORl).

Claims.

1. The combination, with the carriage of an elevator, of two or more screws or worms applied to one common shaft supported in staweight of the load in one direction or thepower each, the end thrust upon the shaft is. avoided, Witnesses: as before stated. By the act of equalizing-the W. E. BOARDMAN,

FRED. CUBTrs.

strain and pressure upon the elevatoncarriage

Images