US1271557A - Scaffold. - Google Patents

Description

B. F. FORSYTH,

SCAFFOLD.

APPLICATION FILED DEC. 3. 19H.

1 ,2? 1 ,55Yw Patented July 9, 1918.

2 SHEETSSHEET l.

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I as CO..PHOTO-LITHO. WASHIN(D114 u pnnntrns ro eonie nomeonee eamena, faf-np TO FREDERICK ZIETHENJiLL OF CHICAGO, ILLINOIS.

.. A Dtwee-Annette: on'rY-rwo ONE-HUNDREDTH'S ECLFFOLD.

s ecification: remnant. awa d Jifl 9, 1918-,

Application filed December 3, 1917. Serial no. 205,105.

Toall whom it mag concern: e

Be it known that I',.;BENJAMI F. Fon- SYTH, a citizen of the UnitedStates, and a resident of the city of Chicago, county of Cook, and 'State of Illinois, have invented certain new and useful Improvements in Scafl'olds, of which the following is a specification. V 7 v I,

My invention relates to improvements in scaffolds, and has for its object the provision of an improved construction jof this character which is simple and etficient i-n use and capable *of folding for easy removal from place to place. H

The invention consists in the combinations and arrangements of parts hereinafter described and claimed. or U The invention will be best 'f'understood by reference to the accompanyingQdrawings forming a part of this specification, and in which: y

Figure 1 is-a partial top plan View of a scaffold embodying the invention, with a portion of the scaffold boa-rd broken away for clearnes's,

Fig. 2, a side View of the same,

vFig. 3 a detail section taken on line 3'3 of Fig. 2,

Fig. 4, a horizontal ,sectionth'rough one of two supporting posts employed in the construction,

Fig. 5, a vertical section corresponding with Fig. 4, 7

Fig. 6, a detail section taken on substantially line 6-6 of Fig. 4, and

Fig. 7, a detail section taken on substantially line 7-7 of Fig. 5.

The preferred form of construction, as illustrated in the drawings, comprises two upstanding supporting posts 8, in the form of iron pipes resting on pedestals or bases 9. Each of the posts 8 is provided at its bottom with three laterally extending braces 10, pivoted at their upper ends to a sleeve 11 adjustably secured in place by means of a set screw 12. Each of the braces 10 is also connected by a link 13 with a sleeve 14 also adjustably secured to the corresponding post 8 by means of a set screw 12. The braces 10 are made of strips of wrought iron. or the like and their lower outer ends are twisted, as shown, and provided. with rubber pads 15 resting upon the fioor. Each of the posts 8 is provided at one side with a longitudinal slot 16fhavinga crossslot 17 adjaeent its upper end. A supporting bracket 18 is sli'dably mounted in each oftheslots 16 an'dprovided with a cross pin 19at its inner end. A, clamping head 20 rests upon the inner "end of each of the brackets 18, to operate within the corresponding "post 8, said bracket being provided with an entry slot 21 extending upwardly from its lower edge, and with a tooth or shoulder '22adapted to engage the under edge of the corresponding bracket 18. flBy this arrangement it will be observed that the V bracket '18 may be readily inserted through slot 16 in its post, andengaged with the inner clamping head 20 by being forced into the slot 21, tooth 22 and cross pin 19 preventing accidental removal and crossslot 17 permitting of the insertion of pin 19.

A clamping head23 is slidably -mounted on enter the brackets 18 to bear against the outer side of the corresponding post. 8, outward movement ofsaid clamping headbeing limited by a stop pin '23 as shown. A scaffold board supporting member 24 is pivoted at 25 to each of the brackets 18, and is proe videdat its inner end with a cam surface 26 engaging the outer side of the corresponding clamping head 23 and serving to force said clamping head into clamping engagement with the post upon'downward swinging of support 24, as will be readily understood. Each of the supports 24 is provided with a. laterally extending stop flange 27 arranged to engage the upper edge of the corresponding bracket 18, to limit the downward swinging of the support. Each of the supports 24 is equipped with an extension 28, adjustably secured thereto by means of a set screw 29 operating through a slot 28, as shown. A stop fiange30 is provided on the lower edge of each of the supports 24 to engage the under side of the corresponding extension 28 to limit the downward swinging thereof. EX- tension 28 is provided with an upwardly and inwardly extending clamping point or shoulder 31. and cam 26 with a shoulder 32, said k the appended claims.

and the braces 10 may be shoulder being arranged and adapted to engage and clamp the sides of an ordinary sca-fiold'board 33, as shown. By this arrangement it will be observed that the scaffold supporting brackets may be readily adjusted to different heights 011 their posts '8,

the supports readily adjusted to engage different sizes of scaffold boards, and the weight of and on the scaffold board serves to automatically hold the scaffold supports clamped in adjusted positions. When it is desired to move the scaffold, thesupports 24L readily folded against the posts 8 to facilitate passage through doors and the like.

Each of the posts 8 is also equipped with a plurality of foldable steps 34, pivotally mounted thereon, each of said steps being concave in form, as shown, to closely fit the sides'of the corresponding post 8 and: provided with ears 34, embracing and "pivoted to the corresponding post. Each of the steps is provided with concave edges 35' to render the footing thereon secure. By this arrangement it will be observed that the steps may be readily extended to facilitate mounting to the scaffold board or folded to facilitate transportation.

While I have illustrated and described the preferred form of construction for carrying my invention into eflect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be'limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of Having described my invention what I claim as'new and desire to secure by Letters Patent is: p

1. A scaffold support comprising a tubular ost slotted at one side; a. bracket slidable in said slot; a clamping head on the inner end of said bracket within said post; a clamping head slidable on said bracket and engaging the outer side of said post; a scaffold board support pivoted to said bracket;

and means operable by said board support, arranged to force said outer clamping head against said post, substantially as described.

2. A scaffold support comprisinga tubular post slotted at one side; a bracket slidable in said slot; a clamping head on the inner end of said bracket within said post; a clamping head slidable on said bracket and engaging the outerside of said post; a scaffold board support pivoted to said bracket; and an eccentric cam on said board support arranged to force said outer clamping head against said post, substantially as described.

3. A scaffold support comprising a tubular post slotted at one side; a bracket slidable in said slot; a clamping head on the inner end of said bracket within said post; a clamping head slidable on said bracket and engaging the outer sideof said post; a scaffold board support pivoted to said bracket; an eccentric cam on said board support arranged to force said outer clamping head against said post; and an adjustable e ten-' sion on said board support, substantially as described. 1

4. A scaffold support comprisinga tubular post slotted at one side; a bracket slidable in said slot; a clamping head on the inner end of said bracket within said post; a clamping head slidable on said bracket and engaging the outer side of said post; a scaffold board support pivoted to said bracket, there being a stop flange on said board support overhanging said bracket and arranged to limit the downward swing. of said board support; an adjustable extension on said board support; and an eccentric cam on the inner end of said board support arranged to contact with and force said outer clamping head against said post, substantially as described. I 1

In testimony whereof I have signed my name to this specification in the presence of a subscribing witness.

BENJAMIN F. FORSYTH. 7

Witness: I I

ARTHUR A. OLSON. I

Gopies'o! this patent may be obtained for five cents each, by addressing the Commissioner 'of'Patents,

' Washington, D. 0.

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