US2481885A - Scaffold - Google Patents

Description

Sept.. H, 1949. E. H. snMPsoN SCAFFOLD 2 sheets-sheet 1 Filed Feb. 25, 1946 Sept., E3, 1949. E. H. SIMPSON 2,481,885

SCAFFOLD Filed Feb. 25, 1946 2 Sheets-Sheet 2 Patented Sept. 13, 1949 UNITEDSTATES PATENT OFFICE 2 Claims.

This invention relates to scaiolds and more particularly to a combination sectional scaold and ladder.

In sectional scaffolds heretofore made, the scaffold has been provided with a ladder which is usually secured at the side of the scaffold at right angles to the plane thereof. This construction has been the preferable type due to the cross bracing between the end frames and the inability of the workmen to get inside the scaffold to climb an inside ladder because of the presence of the cross bracing.

One object of the present invention is to provide a scaffold ladder which will be an integral part of the end frame.

Another object is to provide a sectional scaffold having a ladder in which the cross braces do not interfere with the free use of the ladder.

Another object is to provide a scaffold section in which a leg may be replaced by a ladder section.

A further object is to provide a scaffold ladder which will be strong and rigid.

A still further object is to provide a scaffold ladder which cannot become disconnected from the scaffold frame.

Other objects will become apparent upon considering the following specification, which when taken in connection with the accompanying drawings, describe and illustrate one form of the invention.

In the drawings:

Fig. 1 is an elevational view of the scaffold embodying the present invention showing the ladder in place thereon;

Fig. 2 is a cross section taken on the line 2-2 of Fig. l;

Fig. 3 is a cross section taken on the line 3-3 of Fig. 1, looking in the direction of the arrows;

Fig. 4 is a cross section on theline 4--4 of Fig. l, looking in the direction of the arrows;

Fig. 5 is a cross section on theline 5 5 of Fig. 1, looking in the direction of the arrows but with the wing nut removed;

Fig. 6 is a cross section taken on the line 6-6 of Fig. 1, looking in the direction of the arrows; and

Fig. 7 is a perspective View of the scaffold showing the ladder section and cross bracing in place.

Referring to the drawings, and more particularly to Figs. 1 to 6 inclusive, the scaffold comprises an end frame generally designated Ill, substantially rectangular in form, having a pair of vertical posts II and I2 connected at their upper ends by an upper horizontal support I4 and connected at their lower ends by a lower horizontal support I5.

A plurality of vertical shear braces I6 and I1 join the horizontal supports I4 and I5 intermediate the ends, the braces I6 and I1 stiffening and strengthening the frames.

Bolts 2U havingwing nuts 22, are permanently fixed to the insides of the posts I I and I2 at a suitable distance from the top andsimilar bolts 20 are secured to the inner sides of the shear braces I6 and Il at the same distance from the top so that the fourbolts 20 align. Thebolts 20 are preferably welded to the posts II and I2 and the shear braces I6 and II so as to form a permanent connection therewith.

Bolts 25-25 are formed on the lower side of the lower horizontal support I5 at a point spaced inwardly from the shear braces I6 and I l. Thebolts 25 havewing nuts 26 mounted thereon which are normally retained on thebolts 25 by swedging the end of the bolts. U-shaped retainers 28-28 are formed on the lower side of the horizontal support I5 surrounding thebolts 25 to retain the lower section of the end frame.

The lower end of the end frame may include a leg 3l) which has a pin 3l formed on the upper end thereof which projects into the post I2 and centers the leg directly in alignment with the post. Adiagonal brace 33 is connected to theleg 30 intermediate the ends and is supported by ahorizontal brace 34 running between the post and the diagonal brace to form a bracket supporting the leg from the end frame.

The end of thebrace 33 is flattened and bent horizontally and provided with a slot (not shown) which engages thebolt 25.

Thenut 25 forces the flattened end of thebrace 33 into the U-shaped retainingmember 28 to secure the brace against removal.

For further details of theleg 30 see the copending application of Lawrence C. Oertle, Senior, and Eugene H. Simpson for Scaffoldsf Serial No. 649,898, dated Feb. 25, 1946, now Patent No. 2,467,688 granted April 19, 1949.

The opposite side of the scaffold section may be provided with a ladder, generally designated 31, which comprises a pair ofvertical legs 38 and 39 and a plurality of horizontal rungs 4I), 4I joining thelegs 38 and 39 and secured integrally therewith. The upper end of theleg 38 has acoupling pin 43 formed thereon which fits snugly within the post I I to center theleg 38 therewith.

Theleg 39 may be formed at its upper end with anarcuate bearing plate 45 which is adapted to abut the lower horizontal support l5 and transmit stress from above.

A securing plate 41 (Fig. 5) is formed on the inner side of thepost 39 and is provided with aslot 49 which is adapted to |be rotated onto the bolt to secure the ladder in place, as best seen in Figs. 5 and 6. Theplate 41 is secured against turning, when thewing nut 26 is screwed up, by theretainer 28 into which theplate 41 nts.

The bottom of the ladder andithebottom of thepost 39 may all be provided withbase'l plates 50 which havepins 5| formed integrally thereon which project into the open tubular ends of theladder legs 38 and 39 and theleg 30.

On subsequent ladder sections, that is on elevations higher than the lowermost frame, the lower end ofpost 39 is provided with anarcuate bearing plate 54 which is secured integrally on a pin 55 (Fig. 3), which projects into the end of theleg 39 The arcuate bearingplate 54 transmits: the load on' theladder leg 39 to the upper horizontal support i4,

It will be noted that the shear brace I6 is aligned with the leg 39a of the ladder and that if the ladder be placed on the post I2 the shear brace i1 would then alig-nwith theladder leg 39.

It will also be noted that the two horizontal supports I4 and l5 are spaced at proper intervals to form equal-ly spaced rungs on the ladder.

The inner sides of theladder legs 38 and .39 and the inner side of theleg 33 have bolts 69 formed integrally thereon which are spaced equally from the bottom of the legs. The bolts SD cooperate with bolts 20: to retain the ends ofcross braces 65, the cross bracesbeing retained on thebolts 20 and 69 bywing nuts 22 and 6I.

If desired thecross braces 55 may be secured on thebolts 2) and 69 as shown in the co-pending application of LawrenceV C. Oertle and Eugene H. Simpson, for Sectional scaffolds, Serial No. 614,890-, led Sept. '1, 1945.

Operation To set up the scaiold, the end frames l0 are assembled withsuitable legs 39 and, where desired, ladder se-ctions 31 may likewise be used.

The complete section comprising the end frame withsuitable legs 39 and/or ladders are set up and connected with suitable cross braces (i5.

Where it is desirable to have access to the ladder from outside the scaiold, thecross braces 65 are connected by thebolts 20 located on the shear brace IS and theleg 39 of the ladder, thus giving free access to the ladder from the outside of the scaiold.

Subsequent sections may be superposed on the lower sections and connected with cross braces, some of which have been yomitted from Fig. 7 for the sake of clarity,l to form a scaiold to any desired height It will be realized that the hereinbefore described invention is to be taken merely as a preferred embodiment of the same and that Various changes in size, shape and arrangement of parts may be made without departing from the spirit of the invention or the scope of the subjoined claims.

That which is claimed as new and is desired to be secured -by Letters Patent is:

1. Ina scaoldof the character described comprising an end frame having a pair of Vertical posts separated from each other, a pair of horizontal supports, one of said supports joining said posts adjacent the upper ends thereof, the other said support joining said posts adjacent the lower ends thereof, a bolt on said last mentioned support intermediate the ends thereof, a nut on said bolt, a ladder section comprising a first leg, means on said leg engageable with the lower end of one of said posts to maintain said leg in alignment therewith a second leg separated from said rst leg and engageable with the lower horizontal support, a plurality of ladder rungs joining said legs, means on said second said leg engageable. with said bolt between saidv nutv and said other support to retain the ladder section 0n the frame, and a shear brace joiningv said horizontal supports.

2. In a scaffold of the character described, an end frame comprising a pair of Vertical posts separated from each other, a pair of horizontal supports, one of said supports connecting said posts adjacent the upper end thereof, the other said support connecting said posts adjacent the lower ends thereof, a ladder section comprising a rst leg, means on the upper end of said leg engageable within the lower end of one of said posts, with the ladder leg in alignment therewith, a second leg of` said ladder engagea-ble with the lower horizontal support, a plurality of ladder rungs joining said legs, a bolt xed on the lower side of the lower horizontal support, a nut on said bolt, a bracket on the upper end of said second leg engageable with the bolt to retain the ladder assembled with the frame, and a shear brace joining said upper horizontal support with said lower horizontal support.

EUGENE H. SIIWPSON..

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,311,988 Lavn Feb. 23., 1943 2,316,952 Halfertyl Apr. 20, 1943 2,361,614 Dugan et al Oct. 3l,- 1944

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