US845433A

US845433A - Extension step-ladder.

Info

Publication number: US845433A
Application number: US34332406A
Authority: US
Inventors: Arthur Peltier
Original assignee: FRANK R WHEAT
Current assignee: FRANK R WHEAT
Priority date: 1906-11-14
Filing date: 1906-11-14
Publication date: 1907-02-26
Anticipated expiration: 1924-02-26

Description

PATENTED FEB. 26, 1907.

A. PELTIER. EXTENSION STEP LADDER.

APPLICATION FILED KOV. 14. 1906.

-Z SHEETSfSHEET l.

No. 845,433." PATENTED FEB. 26, 1907.

' A. PELTIER.

EXTENSION STEP LADDER.

APPLICATION nun NOV. 14, 1906.

2 SHEETS-SHEET 1n: NORRIS PETERS CQ.,.WASHINGTON, n. c.

UNITED STATES PATENT OFFICE- ARTHUR PELTIER, OF DETROIT, MICHIGAN, ASSIGNOR OF SEVEN SIX- TEEN THS TO FRANK R. WHEAT, OF VVHEELING, WEST VIRGINIA.

EXTENSION STEP-LADDER.

Specificationof Letters Patent.

Patented Feb. 26, 1907.

Applicationfiled Novembercl, 1906. Serial No. 343.324.

To all whom, it may concern:

Be it known that I, ARTHUR PELTIER, a citizen of the United States of America, and aresident of Detroit, county of Wayne, and State, ofMichigan, have invented certain new and ,useful Improvements in Extension Step- L adders, of which thefollowingis a specification.

Myinvention relates'to'new-and useful improvements in step-ladders, and more particularly to an extension step-ladder; and ithas foritsobject'to-provide a simple, light, durable, and comparatively inexpensive ladder which maybe readily adjustedto any desired height within certain limits;

A further object isto provide an extension step ladder carrying meanswhereby-it may be securely locked in: any position to which it may be adjusted, thereby 'eliminatingthe danger of the parts slipping and givinga firm support fora person standing thereon.

In describing the invention in detail refer ence is herein had to the accompanying drawings, forming a part of this specincation, in which-- Figure 1 is a perspective view of the invention in lowered position. Fig. 2 is a side elevation showing the device folded. Fig. 3 is a side elevation of the invention set up and extended. Fig. 4 is a perspective view of an apertured plate. Fig. 5 is a similar view of a plate having 'a hook on its end for engagement with the apertured plate. Fig. 6 is a partial vertical section taken through the steps of the ladder: Fig. 7 is a perspective view of a supporting-bracket. Fig. 8 is a horizontal section on the line 8 8, Fig. 6. Fig. 9 is a top plan view of the spreadingbrace detached from the ladder, and Fig. 10 is a section on the line a: as, Fig. 3.

Referring to said drawings, in which like reference numerals designate like parts throughout the several views, 1 indicates the ladder proper, and 2 the rear supportingframe, the former being rigidly secured by means of bolts 4 to embracing-brackets 5, attached to the under side of the platform 6, while the latter is pivotally mounted upon a transverse rod 7, having its ends mounted in said brackets.

The ladder proper, 1, consists of two

sections

8 and 9, which are slidable in relation to each other, as shown, each having the usual steps 10, the steps of one section being adapted to coincide with those of the other, forming a wide and secure step when the sections are not extended; and some of the. steps of each coincidng at all times when adjusted togposition whetherrthe sections be extended or not; The'section 8is that which isrig'idly attached to the bracket 5, carried on theun= derslde of the latform 6, and in the outer face of each .si e rail 11 of the section 8 is provided a longitudinal groovea12, in which the hook-like end of ametal strip or strap 13, which isrigidlyattached to the sidexrail 1410f the section 9, is adapted to slide in adjusting saidfsections ,todifferent positions in relation to each other; Saidmetal straps13 further serveito bind the

said sections

18 and 9, together, preventing'the detachment of the'latter from the former. The-rear supporting+ frame 2. likewise comprises two sections 3 and 15, slidable .in relation to each other. The lower section 15 consists of wideslderails-l 6, connected near their, lower ends by aitrans verserod or bar 17 L Said side rails areeach provided with a longitudinal slot-or channel 18, which extends from asuitable point above the lower end upward throughout the length of the side rail, asshown, and slldably mounted in said slotsand held therein by metal bands or

clamps

19 and 20 are the side rails 21 of the section 3. The clamp 19 is rigidly secured to the upper end of one member of the rail 16 by a pin or rivet 22, while'the clamp 20 is rigidly secured by a pin or rivet 23 to the lowerlend of the side rail 21. Impinging set-screws 24 are provided in said

clamps

19 and 20, by means of which the sections3 and 15 may be secured in adjusted position,- said set-screws 24 having-reduced plain ends or points 2.5 engaging sockets 26, provided in metal plates 27. The plates 27 serve to prevent the set-screws from marring the rear edges of the side rails 16, and the plates carried by the clamps 20 further serve as slides whereby the said clamps 20 are caused when released to slide freely. Slideplates 28 are also provided between the front edges of the side rails 16 and the clamps 20,

said plates being preferably riveted to said clamps.

The section 9 is freely slidable with the hook-like end of the strap 13 in the groove 12 of the section 8. As means for interlocking said sections when adjusted two or more metal plates 29 are rigidly mounted on the with the apertures 30, the greater the weight tops of the steps 10 in the section 9, each of said plates being provided with an aperture 30 in its rear end, and mounted on the under side of the lower step of the section 8 are a like number of plates 31, having hooks 32 formed on their front ends for engaging the apertures 30 in the plates 29. In moving the

sections

8 and 9 in relation to each other the lower end of the section 9 is drawn outward to cause the steps thereof to avoid the hooks 32. WVhen the hooks 32 are in engagement borne by the ladder the more securely are the sections interlocked.

Brackets 33 are provided for supporting pails or other articles in a position convenient to the top of the ladder, said brackets each consisting of a plate mounted upon a horizontal arm 34, which is bent to form a vertical portion 35 and a horizontal tenon 36 for insertion through a suitable slot provided therefor in the platform 6, said tenon being adapted for underlying the platform beyond the slot.

A brace 37 is rovided for firmly holding the ladder 1 and the rear supporting-frame 2 when spread apart, said brace consisting of four curved sections 38, each of which is pivotally attached at its outer end to one of the four side rails of the stationary part of the device, and all connected at their inner ends to a common pin or pivot 39. One of said sections 38 has an integral horizontal lip or flange 10 on its inner end which overlies the ends of its companion sections, thus preventing the downward folding of said brace.

Pivotally attached to the under side of the lower step of the section 8 is a plate 41, hav ing a hook-shaped end adapted for engaging an arm 42, attached to the under side of the lower step of the section 9 for preventing the sections from accidentally sliding one on the other when the ladder is lifted after being closed.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an extensible stepladder, a ladder proper composed of two sections slidable in relation to each other, both of said sections provided with steps which are adapted to coincide to form wide steps when adjusted with relation to each other, apertured plates mounted on the steps of the lower of said sections, plates mounted on the lower step of the upper section, hooks carried by the last-mentioned plates for engagement with the apertures in the first-mentioned plates, and a sectional rear supporting frame having adjustable clamps for holding the sections of said supporting-frame in adjusted position.

2. In an extensible step-ladder, a ladder proper composed of two sections slidable in relation to each other, both of said sections provided with steps which are adapted to coincide to form wide steps when adjusted with relation to each other, apertured plates mounted on the steps of the lower of said sections, plates mounted on the lower step of the upper section, hooks carried by the lastmentioned plates for engagement with the ertures in the plates carried by the step v hich coincides with said lower step, a pivoted hook carried by the upper of said sections, an arm carried by the lower of said sections, said pivoted hook and arm being adapted for interlocking engagement, and an extensible rear supporting-frame.

3. In a step-ladder, a platform, brackets attached to the under side of said platform, a ladder proper comprising two

sections

8 and 9, the section 8 being rigidly secured to said brackets and having longitudinal grooves in its side rails, and the section 9 being slidable upon said section 8, metal straps having hooklike ends in engagement with said grooves, means whereby said sections may be interlocked, a rear supporting-frame comprising two sections 3 and 15, the former pivoted at its upper end in said brackets and the latter slidable on the section 3, the side rails of the section 15 being longitudinally slotted and holding the side rails of the section 3 in the slots, and clamps for holding the sections 3 and 15 in adjusted position.

In testimony whereof I aflix my signature in presence of two subscribing witnesses.

ARTHUR PELTIER.

I/Vitnesses:

PETER J. LEBEOK, FREDK A. ECKERT.