US1108771A - Portable elevator. - Google Patents

Description

'I'. S. MGLENDON.

PORTABLE ELEVATB..

APPLICATION FILED sE1 T 24,1913.

anonym;

miran sfr-atras earner onirica.

l THOMAS S. MCLENDON, OF CARROLLTON, GEORGIA.

PORTABLE EJEXTATOR.

mostri.

T all 207mm it may concern:

Be it known that I, THOMAS S. MOLEN- Dox, a citizen ofthe United States, residing at Carrollton, in the county of Carroll and .State of Georgia, have invented new and useful Improvements 1n Portable Elevators, 'v

of which the following is a specification.

This invention relates to portable elevators for domestic use, and 1t 1s an improve- .ment on the device of this class for which to so-construct the frame that it may be utilized as a step ladder; and to simplify 4and improve the construction and ope ation of the brake whereby4 the device is secured against moving on its supporting'wheels or casters while in active use.

With these and other ends in view which will readily appear as the nature of the iny vention is better understood, the same con sists in the improved construction and novel arrangement and combination of parts which will be hereinafter fully described and particularly pointed.out in the claims.

In the accompanying drawing has been illustrated a simple and preferred form of the invention, it being, however, understood that no limitation is necessarily made to the precise structural details therein exhibited,

but that changes, alterations and'modifications Within the scope of the claims may be resorted to when desired. r

' In the drawing-Figure 1 is a perspec tive View of the improved device. Fig. 2 is a horizontal sectional view taken just above the base frame. Fig. 3 is a. transverse sectional Aview takenon the line 3--3 in Fig. 2.

Corresponding parts in the several figures are denoted by like characters of reference. The base frame of the improved elevator includes side bars 15, a front bar 16 and an intermediate cross bar 17. Guide 'rails 17, rising from the side members 15 are connected together at ltheir upper ends by a cap piece 18, said rrails serving to guide the car 19. The upper extremities of the rails or u rights 17 are connected with the front en s of the side members 15 by inclinedbraces 2O on which latter rungs 21 are Specification of Letters Patent.

y lifted with slight effort.

Patentedftug. 25, 11914:.

pplcation filed September 24, 1913. Serial No. 791,687.,

secured at suitable intervals. The braces Q0 also serve to support the drum or windlass 22 having a crank 23 whereby it may be rotated and a ratchet 24 engaged by a dog or pawl 25 whereby the drum may be held against reverse rotation. Flexible hoisting elements, such asv ropes or cables 26, are connected with and wound on the drum, said ropes being guided. over pulleys 27 and 28 connected, respectively, with the cap beam and with the car 19, the ends of the ropes being made fast to the pullcyblocks connected with the car. It willbeseen that by means of the hoisting tackle arranged as herein described, a considerable weight, may be Pivoted on the outer faces of the'sido members 15 of the base frame are levers 2S) which are provided at their frontends with slots 80 yand with recesses 30" adjacent to said slots.4 A rock shaft 31 which is`supported for oscil'lation'on the side mem-bers 15 in advance of the'cross ubar 17V is provided at its ends with cranks 82 accommodated in the recesses 30 and Operating in the slots 30 of the levers, and 'whereby said levers may be tilted from the normal orV initial approximately horizontal position shown in.

Fig. 1 to theinclined position shown in Fig. 3 when the rear ends of said levers will engage the Hoor. The rock shaft has an arm or lever 33 whereby it may be actuated, said arm being so arranged that in the various positions of the rock shaft it will rest ou the cross bar 17 or the front bar 16 of the frame. rihe arm 33 is, moreover, disposed at such an angle with respect to the cranks 32 that when the arm rests o'n the front bar 1G, the extremities of the cranks'BQ will be positioned shghtly in advance of the axis of the rock shaft, or beyond a dead center,

thereby supporting the levers 29 in an inclined position. \The'base frame is provided with low wheels or casters 34 on which it may bc readily moved from place to place, and the levers Q9 are made of such a length 82 to such an extent that when thus tilted the rear ends of said levers will engage the floor and slightly lift the rear wheels or casters 31 from Contact with thc floor, thusl forming an effective brake or device to prevent the elevator frame from being moved on the wheels or casters. V

From the foregoing description, taken in connection with the drawing, the operation and are capablel of being tilted by thc cranks and 4advantages of this invention will be readily understood.

The deviee not only forins a convenient step' ladder for domestic `purposes' which may be readily moved from place. lao place, but it also forms an elevator whereby heavy articles, sueh as'sacks of flour, canned goods and the like may be lifted with slight ei'ort so as to he placed on shelves for storing..

When used as step ladder or as an elevator, the device may be irinly anchored in position-by simply rocking the shaft 31 so as to tilt 'the brake levers `and place the rear ends thereof in floor ,engaging position, the front bar 16 and the cross har 17 servingto limit the moveinentiifrthe arinwherehy the rock shaft is actuated. f

' l[Having tlnis'described the invention, what .Copit-.vlot this patent may be obtained for bar, and having vcranks engaging the slots,

' and Aany arm extending from the rock shaft and-obstructed vterminally by the front bar and the cross barof the base frame.

2. In a portahleelevator of the class Vdef scribed, a base frame having supporting.'

Wheels, said base frame including side memlters, a front bar andan intermediate cross liar. brake levers plvote'd on theouter faces of the side bars and having slotsat thef front ends andl recesses lin their-"inner faces adjacent to said slots, a rock shaft supported on the side meinbersof theloasefraxne between the front bar and the .cross bari and having 1 terminal cranks accommodated inthe recesses or' the brake levers and engagingthe sl0ts therein, and anA operating .arm connected with the rock shaft and terminallypbstructl led by the front bar and the cross bar ofthe base frame.I l

In testimony whereof I affix niy 'sigggnaturev in presence of two witnesses.

' Witnesses: J. P. BBnDLEY,

VH. N. SPENCE.

ve'ccnts each, by addressing the Commissionervof Patents). Washingt'om D. 9.

TnoM'As s. McLENDo'N-Q..

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