US2446005A - Collapsible scaffold - Google Patents

Description

July 27, 194&.

Filed Oct. 8, 1945 F. HARTMANN COLLAPSIBLE SCAFFOLD 5 Sheets-Sheet 1 ATTORNEY.

. July 27, 1948. F. HARTMANN COLLAPSIBLE SCAFFOLD '5 Sheets-Sheet 2 x Filed 001:. 8, 1945 FIG 2 INVENTOR. FRED HARTMANN B M 4 .ATTORNEY.

July 27, 1948. F. HARTMANN 2,446,005

CQLLAPS IBLE S CAFFOLD Filed Oct. 8, 1945 v 5.Sheets-Sheet s INVENTOR. FRED HARTMANN BY 4. ATTORNEY.

- HARTMANN I COLLAPSIBLE SCAFF'OLD 5 Sheets-Sheet 4 ATTORNEY,

July 27, 1948.

Filed 001,. 8, 1945 Patented July 27, 1948 t 2,446,095 l. l t

con -Arsmm soarronn Fred Hartmann, St. Applicationpctobcis, 1945.:senarncsezohm 1 Claim. (01.304442) My invention has relation t'o-improvements in scaffolds and it. consists in the novel features of construction more fully set forth in the claim.

The principal object of my invention is to provide a scaffold that is adjustable as to width to facilitate working in narrow places, and also peri mitmovement through doorways fromroom to :room..without disassembly. A ,further obiect of theinvention is to embody .in. the construction features. .of adjustment whereby the platform in ay bespositioned for ceiling :heights between eight anolfifteen feet. The scaffold may also-be knocked-down and collapsed within very narrow compass =for transportingthesame from jobto job.

Other advantages'of my invention will be better apparent from a detailed description in connection with. the accompanying-drawings, imwhichdotted in a second position; Fig. 6 is an enlarged end elevation (with parts broken away) of one of the standards together with a portion of an end frame and supporting mechanism for the platform (not shown); Fig. 7 is a side elevation of the parts shown in Fig. 6 from the inside; Fig. 8 is an enlarged outside elevation of the standard shown in Figs. 6 and 7; Fig. 9 is a cross-sectional detail taken on a plane indicated b the line 9-9 of Fig. 6; Fig. 10 is a crosssectional detail taken on the line I iilil of Fig. 1; and Fig. 11 is a side elevation of an extension member (showing other parts dotted) whereby the standards may be increased in height.

Referring to the drawings S,S,S,S represent four standards which serve to support the platform P made up of stringers l, i and floor boards 2. The standards 5.8 at each end are connected by end frames F made up of sections 3 and 4 connected together by hinges 5, 5 along a central parting line X. The frame section 3 is connected to one standard S by hinges 6, 6 and frame section 4' is connected to the other standard 5 by hinges I, 1.

Each of the standards S is U-shaped in crosssection (Fig. 5) and has inwardly turned flanges 8, 8 to provide a slot 9 on its inner face for a purpose presently to appear. Each standard S also has a bottom plate It welded to it to which into caster-housing bracebar's" such a's 'bar lidwliich iS' *pr o j' to fit- "over studs H1 1 8* projecting "upwardly 'fron-r'upper cross memberslfi 20 "of-"framesec- A -set serew 'i zis' -threadeii V o that' the roll-er may be Iochedagainstrotation when desired. inner is secured'a easter ll 1 rail" M of frame-sectioir3 is ext -ndieli downwardly X. From what has thus far been v is apparent that the fourstandardsare i1 1 ablyoonnect'ed'by ehtl frames FF so "that the end standards' t'or either pair)" may be moved to and :"f'r'om" each" other to eitherdiminish-pr "increasethe'scaffoldwidth.

Obviously, the"frame -'sectionssane} she-an be locked in their several adjustedanache: I accomplish {this byi the use *of g a pluifa'lity" Y of tions 3 and 4 when'the'frame sectlons train line to provide maximum width of the scaffold. When the frame sections 3 and 4 are broken inwardl (Figure 4) the hinge elements 2! and 22 of sections 3 and 4 are brought into line, and studs 23 and 24 projecting from the respective sections may be connected by a bar 25 and secured in place by wing-nuts 26. At this time the scaffold has been contracted to a narrower Width. When it is desired to contract the scaffold -to a still greater extent, the sections 3 and 4 are secured by brace bars shorter than the bar I 6 and perforated to receive studs I! or I8 spaced the required amount. Obviously there may be any number of such bars.

It will be noted that the extremitiesl9 and 20 of frame sections 3 and 4 are bent outwardly at an angle of approximately degrees from the plane in which the sections lie so that with the hinge members 6 and I an offset angle is formed to permit clearance for the stringers I, I as they are adjusted vertically, as will presently appear. The manner of supporting the stringers will now be described reference being had particularly to Figs. 6 to 9 inclusive.

On the outer side face of each standard S is welded "(or otherwise secured) a channel 2! having a plurality of notches 28 spaced along its flanges, and disposed within each standard S is a channel bar 29 of substantial length. The

flanges 30, 30 of bar 29 are held in frictional contact with the inner surface of the standard on both sides of flanges 8, 8 by studs 3|, 3|, 3|, 3| which pass through the bar 29 and slot 9 of the standard. The two lower studs 3|, 3| are secured directly against the standard. S by Washers 32 and wing-nuts 33, while the two upper 3 studs 3|, 3| are also utilized to hold a hanger 34 and retaining member 35 against the inner face of the standard. The hanger 34 is generally U-shaped with a depending flange 36 and is held against the standard by the studs 3|, 3| 1 which pass through the flange 36 and side 34' of the hanger, said studs being secured by the washers 32 and wing-nuts 33. The retaining member 35 is 'Z-shaped, one flange 31 of which is secured to the standard by the top bolt 3| and the other flange 38 embracing the hanger to re A tain its free side 34" in place. The hanger 34 has an enlargement 39 formed between its bottom 40 and flange 35 in which is an opening 4| to receive a retaining clip 4-2 which has laterally disposed extremities 43 and 44, .the former being lodged in opening 4| and the latter being adapted to fit into an of the pairs of notches 28 formed I on the channel 21 whereby the hanger 34 is firmly supported in its adjusted position.

From theforegoing it is apparent that the hangers 34 may be adjusted to any desired horizontal position by loosening the wing-nuts 33 after removing clip 42. The clip 42 is then inserted in its re-adjusted nuts tightened. 1

, The stringers are secured in the hangers 34 by screw-eyes 45. The standards S, S are braced longitudinally by brace bars 46, 46 (Fig. 1) secured by bolts 47 and wing-nuts 48 to the outer face of each standard and pivotally secured to straps 49 hooked over the stringers and secured to them by set screws 50 (Fig. 10).

position and the wing- I have provided extentions 5| (Fig. 11) for each standard S constructed similarly to the standards except that a tongue 52 extends from the lower end of each extension for entering the upper end of the standard.

When the extensions 5| are used, it may be desirable to tie the stringers together. This may be accomplished by connecting opposite screw-, eyes together by a chain 53.

It should be obvious from the above description that my improved scaffold may be folded together to facilitate its removal from one room to another without completely dismantling it.

Having described my invention, I claim:

A scaflold having collapsible end frames, said end frames including supporting standards, each of said standards comprising a hollow slotted member having a notched bar on its outer face, a hanger assembly operable in said slot, means for clamping the assembly to the standard, and

means for anchoring said hanger assembly to I said notched bar. FRED HARTMANN.

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

UNITED STATES PATENTS

Images