US2125829A - Scaffold ladder - Google Patents

Description

Au. 9 R. A. UECKER ET AL 2,125,329

SCAFFOLD LADDER Filed Nov. 15, 1955 2 Sheets-Sheet 2 INVENTOR A. (la-ken 16. Pa/nba &

B I J I. 1 a,? WEST RN Y Patented Aug. 2, 1938 UNITED STATES PATENT OFFICE scmom LADDER Reinhold A. Uecker and Ingar G. Rambo, Milwaukee, and Eugene H. Simpson, West Allis, Wis., assignors, by mesne assignments, to Satway Steel scaffolds Co. of America, Wilmington, Del.,'a corporation of Delaware Application November 13, 1935, Serial No. 49,486

'lClaims.

Another object is to provide a ladder which i may be locked to a scaffold section to insure against it becoming unfastened and causing the worker to fall.

A further object is to provide a ladder which will be safe to use and which will be simple and economical to manufacture.

Further objects will become apparent from. the

following description taken in connection with the accompanying drawings, in which:

Fig. 1 is a side view of a scaffold of the type described in the-United States Patent to Reinhold A. Uecker, issued June 9, 1936, No. 2,043,498, showing two types of ladders, as applied to the scaffold, which embody the principles of the present invention.

Fig. 2 is a cross-section on the line 2'-2' and 2"2" of Fig. 1 looking in the direction of the arrows.

- composed of a plurality of end frames l0 which.

Fig. 3 is a cross-section on the line 3-3 of Fig.- 2

showing the fastening means of one type of ladder.

Fig. 4 is an enlarged perspective view of thetype of ladder shown in Fig. 3.

Fig. 5 is a detail of the holding and locking means on another type of ladder.

In the drawings, the scaffold is of the type shown and described in the above mentioned patent to Reinhold A. Uecker, No. 2,043.498, and is are spaced from each other and connected by cross braces II which may be pivoted at the center as disclosed in the aforesaid patent. The scaffold is built up by adding other end frames |2-l2 superimposed on the sections ID in the manner disclosed in the Uecker patent. Each of the frames l0 and i2 have cross braces l3 and H which may support scaffold planking.

The present invention contemplates a ladder to be attached to the end frames Ill, I2 to enable workmen to readily ascend and descend the scaifold.

While the ladder is preferably on the outside of the scaffold as shown at IS, the invention also contemplates placing the ladder within or on the end of the scafiold as shownat. I6.

The ladder l5 which is best shown in Fig. 4, is preferably made on a channel 20 with rungs 2| welded or otherwise suitably fixed thereto.

The ends of the rungs 2| may be, turned'up as shown at 22 and joined by a guard 23.

A bracket 24 is fixed to the upper end of the channel 20 and extends parallel to the legs of the channel and terminates in a semi-circular bend 25 which engages the cross bar l3 to support the upper end of the ladder. It will be noted that v the inner edge 26' of the bend 25 abuts the inner edge of the vertical member of the end frame, as shown in Fig. 2, and prevents the forward movement of the ladder.

The lower end of the ladder is supported by a bracket comprising a pair of wings 23-49 fixed to 'the'legs of the .hannel 20. The wing 29 has a pair of brackets 3lJ-3| formed thereon which support a pin 32. The pin 32 has a curved strap 33 mounted to rotate thereon. The strap 33 has a main curvature 35 which receives the cross piece M and a reverse curve 36 which is supported on the wing 23.

A second form of ladder is shown in Figs. 1, 2 and 5 at it. In this modification rungs 4!] are connected between two parallel supports and are held on the endframes l0 and i2 by four brackets 42-42 and 43-43 which book over the supports l3 and M respectively, The ladder I8 is prevented from loosening by a link 45, best shown in Fig. 5, which is pivoted on'the outside as shown at 46 and prevents the bracket 42 from being withdrawn from the support l3. A stop 41 limits the movement of the link 45.

The ladders shown may be connected to any sections desired, and the ladder built up to the full height of thescaifold.

While two modifications of the invention have been shown as applied to the Ueckerscaffold it will-be realized that these are merely illustrative of the invention, and that various types of scaffolds and other modifications of ladders may be resorted to Without departing from the spirit of the invention as defined by the appended claims.

What is claimed as new and desired to secure by.Letters Patent is:

1. In combinationwitha scaffold comprising a plurality of end frames superimposed on each other, each end frame including a pair of vertical of rungs carried from said supporting member and extending substantially at right angles thereto, and means attached to said ladder and engageable with said horizontal brace to support the ladder from the brace.

3. In combination with a scaifold comprising 'a plurality oi end frames superimposed on each other, each end frame including a pair of vertical posts and a pair of horizontal braces joining said posts, a ladder comprising, a supporting member embracing one of said posts, a plurality of rungs carried from said supporting member and extending substantially at right, angles thereto, and a pair of brackets fixed to said supporting member and engageable over the upper and lower braces respectively, to support the ladder from said braces.

4. In combination with a scaifold comprising, a plurality of end frames superimposed on each other, each of said end frames including a pair of vertical posts, and a horizontal brace Joining said posts; a ladder comprising, a central support embracing one of said posts, a plurality of rungs carried from said support, and a bracket carried by said support and engagable with said brace to support the ladder, and engageable with the post to prevent forward movement of the ladder.

5. In combination with a scafl'old comprising, a plurality of end frames superimposed on each other, each of said end frames including a pair of vertical posts, and a horizontal brace joining said posts; a ladder comprising, a central support embracing one of said posts, a plurality of rungs carried from said support and extending substantially at right angles thereto, a bracket carried by said support engageable with said brace to support the ladder and engageable with the post to prevent forward movement of the ladder, and means on the opposite end of the ladder from said bracket to prevent movement of that end of the ladder.

6. In combination with a scaifold comprising, a plurality of end frames superimposed on each other, each of said end frames including a pair of vertical posts, and an upper and a lower horizontal brace, said lower brace being spaced from said upper brace-and from the lower end of the posts, said braces forming with said posts a substantially rectangular frame; a ladder comprising a central support embracing one of said posts, a plurality of wings carried from said support and extending substantially at right angles thereto, a bracket carried by said support engageable with the upper brace to support the ladder and engageable with the post to prevent forward movement of the ladder at the upper end, means adjacent the lower brace to prevent movement of the lower end of said ladder, and a support connected to said last named means and engageable with said lower brace to form a supplemental support for the ladder.

7. In combination with a scafiold comprising, a plurality of end frames superimposed on each other, each of said end frames including a pair of vertical posts, and a horizontal brace joining said posts; a ladder comprising-,-a supporting member, a plurality of rungs carried by said supporting member, means attached to said ladder and engageable with said horizontal brace to support the ladder from the brace, and means pivoted relative to the supporting member engageable with the horizontal brace to lock said last named means against disengagement.

REINHOLD A. oEcKER. moan G. RAMBO. EUGENE H. snvrPsoN.

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