US1450312A - Extension ladder - Google Patents

Description

Apr. 3, 1923.

R. M. STOLWORTHY EXTENSION LADDER Fll ed Mar.

VII/4 1 '////6 Patented Apr. 3, 1923.

I Issac-.1

RICHARD m-s'roLwon'rnv, or CINQINNATIQEQHIOQ.

EXTENSION LADDER.

i 1 Application filed March is, 1922. Serial No.,-544,071. 1

To all whom it concern:

Be it known that I, RICHARD M. STOL- in the county. of

woR'rHY, a: citizen of the United States-and a resident of- Cincinnati,

HamiltonfandState of Ohio, have invented "certain new and useful Improvements in Extension Ladders, of which the following is a full, clear, and exact description, refer ence being had to the accompanying drawings, forming part of this specification My invention relates to ladders provlded with an extension section especially adapted for use inside of buildings, and it consists of a construction in which the ladder may be readily and easily extended and wherever located may be held in upright position by devices adapted to engage the ceiling of the room, so as to effectively support the weight of the user without liability of upsetting.

The invention consists of that novel construction and arrangement, of parts to be hereinafter particularly pointed out and claimed, whereby the above resultsare at tained.

In the drawings, 7 t

Figure 1 is a perspective view of my improved ladder.

Figure 2 is a longitudinal section of one of the side rails of the vertical extension portion of the ladder.

Figure 3 is a cross section of one of these side rails. l

The lower portion of the ladder is made up of two sections A and B inclined towards each other to form a substantial support for the vertical section C.

The lower sections are formed in the usual way of side rails 1, 1, and 2, 2, with rungs 3 a convenient distance apart. The upper ends of the lower sections are provided with metal caps 4, 5, to reinforce and protect these ends, and each cap has a projecting lug 6, which is threaded to receive a clamp ing screw 7 operated by handle 8 to effectively clamp the side rails 9 and 10 of the vertical extension section C. v

The metal cap pieces are formed to overlap these side rails so that a firm and rigid lock may be obtained when the clamp screws surfaces may be roughened or reinforced with ordinary toothed plates to more effectively accomplish this result. The side rails 9 and 10 of the vertical adjustable section C 5 extension C being raised as are tightened or the contracting clamping have rungsl2'and for raising the Vertical section Iprovide a Windlass l3 journaled in the side rails of one ofthelower: sections.

;Thi s windlfass has the handle lza'nd a pair of cables 15 run .fromthiswindlass -to be secured'around a rung ofithe extension, "so 0.

that by loosening the clamp screws 7 and turning theuwindlass the ladder "can be raised ,or'ex'tended' as desired. The-lower and; upper'endsofthe side rails of the sec-'1 7 tion C are also protected withmetal caps .65

16, 16,'and '17, I7 respectively.

Extending upwardly'either along the out side or preferably as illustrated through alongitudinal central opening inv the side rails each side rail, screwthreaded inthe lower cap 16 and provided with a handle 19 for adjustment. The upper endof eachfielevat ing rod "projects through the metal cap 17 and is provided with an adjusting sleeve20 I in which is mounted an adjusting screw 21. Each of thesescrews carries 'avacuum cup 22 moulded or otherwise secured thereto, which cup is adapted to engage the ceiling of the room in which the ladder is used in I order to hold the ladder rigidlyin place.

There is also provided with the ladder a pair of platform pieces 23, 23, provided with horizontal braces and hooks 24 to be engaged around any desired rung of the ex tension. These, platforms are provided with supporting side chains 25 with hooks 26- to engage over an upper rungto hold the plat form in horizontal position. In order. to

brace and support the members of the lower 9 sections A and B from spreading, I provide a keeper bar 27 and when desired hook rods 28 can also be employed at the lower end of the sections.

' The use of the'ladder will be obvious from 951" the foregoing description." A great advantage of the, construction is that it can be used in any portion of the roomdesired, the described nearly, to the ceiling and the vacuum caps then, 9, elevated bythe rods 18 until they obtain a firm grasp on the ceiling.

It will also be obvious that two ormore of the ladders can readilybe employed to form a scaffold with. platformboards rest- 1 it ing on the rungs. I v I I Havlng thus descrlbed my inv'entlon, what' "I claim as'newand desire to secure by Letters Patent, is z- 1. In anexten'sion ladder for interioruse.

Q and 10 is an elevating rod "18 for 70 the combination with supporting base sections of a vertical section with means for extending and clamping the vertical section upon the supporting base, the side rails of the extension sectionbeing provided with vacuum cups to engage the ceiling to secure the ladder in vertical position.

2. In an extension ladder for interior use, the combination with supporting base sections, of a vertical section, with means for extending andclamping the vertical section upon the supporting base, the side rails of the extension section being provided with vacuum-cups to secure the ladder in vertical "position, and means for extending said cups to engage the ceiling.

3. In an GXtGIlSlOD ladder 'for interior use, the combination with supporting basesections, of a: vertical section, with means for extending and clamping the vertical section upon the supporting base, the side rails oi? the extension section being provided with elevating rods, and means for operating them, the upper ends of the rods carrying" the lower-ends foroperating them, the upper ends of the rods carrying vacuum cups to engage the ceillng.

sienna]; M. sTonWonTHv.

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