US155018A - Improvement in scaffolds - Google Patents

Description

UNITED STATEs PATENT OEEIOE.4

cHAELEs-M. EEENcH AND JOHN J. MCEADDEN, OE AKEON, OHIO.

IMPROVEMENT IN SCAFFOLDS.

Specification forming part of Letters Patent No. 155,018, dated September l5, 1874; application filed May 23, 1874.

To all whom it may concern:

Beit known that we, CHARLES M. FRENCH and JOHN J.`MGFADDEN, of Akron, in the county of Summit and State of Ohio, have invented a new .and useful Improvement in Scaiolds, of which the following is a specication:

Figure 1 is a side view of our improved scaffold. Fig. 2 is an end view of the same;

Similar letters of reference indicate corre a scaffold which comprises four slotted cornerposts,connected in pairs b y horizontal platformbeams, which are capablc'of being adjusted in a vertical direction through the medium of long screw shafts passing directly through the top ends of the vertical slotted parts, through the tenoned ends of the vertically-adjustable platform-beams, and bearing at their lower ends against metallic plates at the bot tom of the slots in the posts, the devices above referred to constituting the means for adjusting the scaifold-beams in a vertical direction, while the longitudinal expansion or contraction' of the entire scaffold is effected by means of slotted braces or connecting-bars, which extend either in a diagonal or horizontal direction, and are attached in an adjustable manner to the corner-posts.

A are four posts, of any convenient height, and of such a size as will give the necessary strength. The posts A are slotted longitudiT nallyto receive the tenons b1, formed upon the ends of the two cross-beams B. The ends of the tenons b1 project upon the outer sides ofV the posts A to receive the keys b2, to keep them in place while the braces C are being adjusted. The braces C are slotted longitudinally to receive the bolts or screws c', by

the tenons b1, and their forward ends rest upon metallic plates secured in the bottoms of the slots in the posts A, so that, by turning the said screws D in one or the other direction, the beams B maybe raised and lowered, as may be desired. The screws D have cranks df, or hand-wheels, formed upon or attached to their upper ends. E are short posts, the lower ends of which have tenons formed upon them to enter mortises in the beams B. To the upper ends of each pair of posts E is attached a cross-beam, F, thus forming an eX- tension-frame, which may be attached and detached, as required. The extension-frames E F may be strengthened by braces C, if desired. To the lower ends of the posts A are attached casters G, so that the scaffold may be readily moved from place to place, as required.

Having thus described oury invention, we claim as new and desire to secure by Letters Patent- The vertically and horizontally adjustable scaffold herein described, consisting of the slotted corner posts or standards A, connected in pairs by the horizontal vertically-adjustable platform-beams B, in combination with the adjusting-screws D, disposed Wit-hin the posts, and the slotted braces or connecting-bars G C,

yall the parts being constructed and relatively arranged as herein set forth.

CHARLES M. FRENCH. JOHN J. MGFADDEN.

Witnesses:

HENRY PUEDY, C. H. PAYNE, J. C. BAIED.

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