US1329740A

US1329740A - Extension for ladder-legs

Info

Publication number: US1329740A
Application number: US232809A
Authority: US
Inventors: Frederick H Barron
Original assignee: Individual
Current assignee: Individual
Priority date: 1918-05-06
Filing date: 1918-05-06
Publication date: 1920-02-03
Anticipated expiration: 1937-02-03

Description

F. H. BARRON.

ExTENsloN FOR LADDER LEGS.

APPLICATION FILED MAY 6, 1918.

fige

F. H. BARRON.

EXTENSION EGR LADDER LEGS.

APPLICATION FILED MAYB, 1918.

1,329,740. Patented Feb. 3,1920.

2 SHEETS-SHEET 2.

51m/manto@ fedefjC/ H. arron FREDERICK H. BARRON, OF ENTIAT, WASHINGTON.

EXTENSION FOR LADDER-LEGS.

Specication of Letters Patent.

Patented Feb. 3, 1920,

Application'led May 6, 1918. Serial No. 232,809.

T 0 all 'whom 'itmag/ concern Be it known that I, FREDERICK H. BAR- noN, a citizen of the United States, and resident of Entiat, county of Chelan, and State of lVashington, have invented certain new and useful Improvements in Extensions for Ladder-Legs, of which the following is a specication.

My invention relates to ladders and consists of an attachment by which a ladder leg may be lengthened as may be necessary to fit uneven ground.

The object of my invention is to provide an attachment for ladders by which any ordinary ladder` may have one of its legs made longer or shorter, as desired, and thus cause it, to be more convenient for use on uneven or sloping ground.

My invention comprises the novel parts and combinations of parts which will be hereinafter described and then particularly Claimed.

In the drawings I have shown my invention in the form of construction which is now most preferred by me.

Figure 1 shows in perspective my attachment as applied to the end of a ladder leg, a portion of the upper yend thereof being broken away.

Fig. 2 shows the lower end of a ladder having my attachment applied thereto.

Fig. 3 is an edge view of a ladder leg having my attachment applied thereto, a portion thereof being broken away, to show parts.

Fig. i is a transverse section on the liuc 4 4 of Fig. 3.

Fig. 5 is a longitudinal section through the part of my device which is fixedly se cured to the ladder leg, and which forms the guide for the adjusting bar.

Fig. 6 is a face view of the parts shown in Fig. 5.

My invention comprises two principal parts, a base member, which is designed to be ixedly secured to the lower end of a ladder leg and which is so constructed as to Jform a guide within which the extension bar may slide, and which isl provided with means for locking enffagement with said eX- tension bar. The other part is the extension bar which is mounted to slide in said base or guiding member and which may be projected to increase the effective length of the ladder bar upon which it is mounted.

In the drawings 1 represents a metal plate which is so constructed as to be capable of attachment upon the leg of an ordinary ladder and also so as to provide a supporting gulde for the extension bar 2. The plate 1,

in the design illustrated, is supposed to be made' of rolled sheet metal of a substantial thickness so as to give ample strength. This is made of a plate having a width exceeding materially the width of the ladder leg.

Its side edges are cut so as to provideY ears 10 at each end which may be bent about the edges of the ladder leg 9, to overlap the opposite sides thereof, as is shown in Figs. 1, 3 and a particularly. The tips 11 of these ears 10 engage the' opposite or back side of the ladder leg and assist in holding the plate in v.posit-ion. The plate being rolled of sheet metal is malleable and may be bent over with a hammer so as to fit ladder legs of different thicknesses. In addition, I provide two securing bolts 15 which pass through the ladder leg. The heads of these bolts should be countersunk or flush with the outer surface of the bar, to permit free sliding of the extension bar 2.

Adjacent the ears 10 by which the plate is v secured upon the ladder leg, are other ears 13, which ears are oppositely bent so as to have their end sections parallel with the body of the plate 1, but spaced loutward therefrom a suiiicient distance to accommodate the extension bar 2 and to permit the free sliding action of said bar under these ears. Between the ears 13, 'at opposite ends of the plate, are side flanges 14, which project outwardly and which form a base upon which the locking device'is mounted. The

base portions 15 of the ears 13, together with the anges 14 just mentioned, form edge supports and guides for thel extension bar 2.

The extension bar 2, as herein shown, is of a composite construction. This employs a filler 20, the same being intended as a bar of wood. This is provided with a metal envelop or covering which consists of two parts. The chief of these parts consists of a plate 21 which has its ed es bent up so as to engage the edgesor` t e filler bar 20. These side flanges 22 are of a width to extend somewhat beyond the surface of the liller bar 20 and to overlap the edges of the other member 3 of the extension bar. This member 3 is a plate which is so constructed as to provide means for holding engagement therewith of a locking dog.

The means preferred and illustrated, consist in providing this plate with transverse corfugations, as `is clearly shown in lligs.

, l and 3. The flanges 22 of the companion pivot bar 40. rlhis dog has an arm Al entending outwardly by which it is controlled. A spring 42 mayY connect this outer bar with a bolt i3 which extends between the two side Hanges la and thus serves to holdthe do in loclring engagement. rl`he inner end ed this dog engaging the corrugations in the plate 3 of the extension bar, will preventv upward movement thereof. Downward movement may be secured by pulling out the extension bar. l/'hen 1t is desired to move this extension bar upward,

the locking dog t must be held outward y sufficiently to permit such movement.

till

As shown in Figs. 5 and 6, a slightly diderent type of locking bar is employed. ln this case the locking dog @el is of a some-- what diid'erent type of construction. lt is pivoted upon a bar 40 in a similar manner vbut is provided with a rib or tooth i5 for engagement with the corrugated face of the plate 3. A locking bar to hold this dog in loclred position is provided. rlFhis bar 5 is pivoted upon'a bolt 50 which is essentially the saine as the bolt or rod 43, shown in Fig. 3. v

The spring ft2, instead of being 4secured to the vrod or kbolt d3', is secured to the lochbar 5, and normally holds the same in s 'position shown in full lines in Figs.. 5 i Villen in this position, the extension bar is securely held 'by the dog 4l. The dog All has a linger i6 so placed that when the bar 5 has its outer end thrown downward, the inner end will engage the inner surface of the nger d6 and thus raise the locking dog so as to free the extension bar and permit free movement thereof in either direction.

llo the lower end of the extension rod and preferably forming a part of the plate 2l which forms the major part of the reinforcement thereof, is' a foot 6. rll`his ein tends laterallyand is intended to give a material area to the end of the extension bar so that when 1n use it will not sinlr into ushing `or :lineari-4.o

soft ground. 'lChe foot is braced by a diag'- i onal extension 30 of theplate 3 which has Vits extreme end 3l flanged over the end of of the foot are bent over the same, as is. clearly shown in Fig`. l, and suggested in Fig. 3.

. The above device is of such design that I it may be cheaply/made and yet be strong. llt may be conveniently applied by any person to an ordinary ladder and requires no special tools for thiswork. The-extension eg may be applied to the ladder leg though the thickness of the latter vary.

What l claim as my invention is:

l. A ladder extension'` leg comprising a wood filler bar, a metal plate inclosing said filler bar on three sides, and a corrugated'4 plate covering the fourth side of said filler bar, the metal plate being :danged over said corrugated plate to hold it in position, said metal plate at its lower end being bent llaterally to form a foot, and'said corrugated plate being bent at a point above the bend in the metalv plate, and with its lower end Jloined to the foot to provide a brace thereijor. l

2. A ladder extension leg comprising a wood ller bar, a metal plate inclosng said liller bar on three sides, and a corrugated plate covering the fourth side of said iller bar, the metal plate being danged over said corrugated plate to hold it in position, said metal plate being bent laterally to form a foot at its lower end, and said corrugated plate being bent at a point above the bend in the metalplate, the lower end of said corrugated plate being llanged over` theV outer edge of the foot, and theouter .corners of the foot being flanged over the edge of the corrugated plate to form a brace for said foot. V

` 3. A ladder leg extension device comprising a wood filler bar, incasing metal plates therefor of which one broad face is corrugated, a base plate adapted to .be secured upon the ladder leg, pivot carrylng danges forming part of said' base plate, and a lockingv dog pivoted in said pivot carrying flanges and engaging the corrugations in said plate tovv lock the extension leg in position. v

ISigned at lJlenatchee, Washington, this 2th day of April, A. lll., 1918.

rnnnnnrfon n. Bannon.