US1134214A - Step-ladder. - Google Patents

Description

i, G. MTCHELL,

" mama Apr. f5, 1915.

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Nil

IRA-Cr. Ii'IITCHELL, OI COLORADO.

saine-Lennon.

Speccaton of 'Letters Patent. i

Patented Apr. G, il Eli Application filed .nly l, 1Std. Serial No. 851,792.

To au iff/wm t may concern: Be it known that l, ina G. MITCHELL, a

'citizen ofv the :United States, residing at Meeker, in the county of Rio Blanco and State of Colorado, have invented certain new and useful improvements in Step-Ladders, of which the following is a speciiication, reference being had to the accompanying drawings.

My invention relates to certain new and useful improvements in means for securing safety in the use of ladders, and more particularl'y to step ladders. v

It has for its object simplicity and economy in construction, ready attachment .to ladders and ei'ectiveness in use.

ln order that others may know how to make my improved safety device and to appiy the same to ladders and to also-fully appreciate its advantages, l willproceed 'todescribe the seme, referring by numerals'to the accomoanying drawing, in which* llig'nre l is a side elevation of an crdinary short step ladder equipped with a, part of my safety devices. lq1 ig. 2 is an inside elevation ci one side ci' a 'comparatively long1 step ladderyand showing; means auriiliary to that shown in Fig. l., for 'securing Fig. 3 is a vertical section onthe line Xf-X, of Fig. 2; and Fig. Liis a detail section of the iframe and 'foot shown in Fig. l.

Similar reference numerals indicate like parte inthe several igurcs or the drawing..-

l represents theA sides oan ordinary step ladder, between and to' which the stegis 2 are secured in the usual way. The lower extremity of these sides are rounded as clearly shown in Fig. 4:, and are located-in a cast metal shoe 3 and pivotally connected vthere- ,withl by an ordinary screw bolt 4 and nut 5.

The bottom or sole of this shoe is prei'erably formed with transverse dovetails in which are located leather or ruhher friction pads 6 to prevent any accidental slipping of the shoe, but in lien or" these pads, the sole may be corrugated or .in any other snitable mannerA rendered anti-slipping. The

bracing Jrame or prop 7 is also preferably provided with shoes 3, of similar construction to that already referred to. in the ordinary' step ladders of comparatively short height, l have found that by the use of riction shoes the ladder will not slip or spread and that if so desired, the ordinary means for preventing the spreading may be di@- penscd `with, although if such mean.: are

employed, the irictionshoes cooperate therewith and add struc'ttae.

ncases of co paratively long orI high ladders, additionlll safety means, such as shown in Figs. 2 and 3 are employed and in which 8 represents .a metal frame secured by screws 9, to the'inside 1 of the ladder. This frame 4is recessed at' the back to receive greatly to the stability of the a sliding' block 10 provided with a threaded stem 1l which-projects through, and is slidable within a vertical slot l2, inthei'rame. rihe threaded` stem is secured at its outer end to a block or head 13, in which is pivotally located a prop le composed. preterably of metal tubing oi suitable stability, and between this head andthe outer tace of the frame v8, are arranged a vWasher or plate 15, and a wing nut 16, the latter threaded upon the stem, so that the prop may in an obvious manner he adjusted to any altitude withreference to the frame and then. se-

curedin fixed relation therewith by means ci the nut 16, when the prop has also been swung to the' desired position. The `free or lower end of this prop is preferably provided with a short sleeve 17 threaded to the prop and which is adapted to receive friction pad 1S, but in lien of this construction,

the end of the prop may be rendered antislipping in any other desired manner For any desired anglo accordingly, as the propv- 14 isy adjusted.'

From what has been described and shown, it will be seen that the major parts of my and desa'fcty devices can` be cheaply and' quickly made by casting, and that the other and limited mimh'er of parts, are inexpensive v .and all can he readily "assembled and vdisassembled and that they may be readily ar?- plied in operative relation with any ordinary step ladder, by simply rounding the bottom extremities of the ladder before securing the cast metal shoes thereon.

Having thus described this invention,

whatl claim is The auxiliary bra ce or prop consisting oi a rearwardly recessed and verticali).T slotted frame; a block sldable Within the recess of` the frame and provided with a projecting threaded stem extending through the vertical slot and secured to an exterior head or block; a member pvotaily connected with Said bl'ock or head, and 'means surrounding Qthe threaded stem'and between the block or head and the face of the frame. for securing

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