US1713359A - Folding trestle - Google Patents

Description

May 14, 1929. J.- D. THOMAS ET AL 3 FOLDI NG TRESTLE Filed Feb. 15. 1928 2 Sheets-Sheet l Inventor;

cI jlf/iozzzas, cf. 2 flolezow,

Attornqy Patented May 14, 1929.

UNITED STATES PATENT OFFICE.)

JOHN D. THOMAS AND JOHN E. HOL'ETON, OF NORTH ENGLISH, IOWA.

FOLDING 'rnnsrnn.

Application filed February 13, 1928. ScrialNo. 254,000.

This invention relates to new and useful improvements in folding trestles and aims to provide a trestle structure that can be qulckly and easily folded into compact form so that it may be readily transported from place to place.

In the drawings wherein lil re reference characters indicate correspondlg parts throughout the several views Figure 1 is a side elevation of our folding trestle, the legs and supporting braces therefor at one end of the trestledisclosed in full and dotted line position.

Figure 2 is an end elevation of the trestle when in set up position.

Figure 3 is a' bottom plan view of the trestle when completely collapsed.

Figure 4 is a side elevation of the trestle when in collapsed condition.

Figure 5 is a transverse cross section taken substantially upon the line 5-5 of Figure 4.

Figure 6 is an end elevation of the trestlein collapsed condition, and

Figure 7 isa fragmentary vertical section through one end of the trestle looking toward the adjacent leg structure when in set up condition.

Now having particular reference to the drawings our novel trestle consists of a' somewhat narrow board 5 of predetermined length to the bottom of which is secured longitudi nally a channel bar 6 of relatively wide in verted U-formation in cross section as clearly disclosed in Figure 7 Arranged transversely through the side wall of this channel bar adjacent opposite ends thereof are cross pins Pivoted to each cross pin 7 is a pair of complemental end legs 88 of L-bar construction.- The loose-connection of the legs to the pin permits the legs to be separated after being swung downwardly into the full line posi-- tion disclosed in Figures 1 and 2. The edges of the adjacent walls of the legs at their upper ends are beveled so that they will have flush engagement with each other when the legs are converged outwardly as disclosed in Figures 2 and 7 Furthermore, in order to prevent wobbling of the legs upon their pivots there is arranged upon the respective pin 7 between the legs, a spacing collar 9.

In order to retain the legs in converging relation, said legs are interconnected inter.- mediate their ends by toggle levers 101Q pivotally interconnected at their adjacent ends as at 11.

Furthermore, the said legs 88 are connected to the adjacent side walls of the channel bar 6 by elongated toggle levers 1212 which are pivoted at their outer ends to the legs and to the channel bar respectively, the inner ends thereof being pivotally interconnected as at 18, the connections between the toggle levers lO-1O and 1212 being of the conventional break joint disclosed.

Obviously after the joints of the levers- 1010 and 1212 have been broken the legs 8-8 may be swung into engagementwith each other and thence folded inwardly into position Within the channel bar 6 at the under side of the board 5.

Pivoted to the lower end of a pin 14 depending from the main wall of the channel bar 6 intermediate the ends thereof is a'latch plate 15, the ends of which will engage over the adjacent endsof the pairs of legs 88 after the .same have been swung into the channel bar 6 to prevent the outward swing- 1iang of the legs with respect to said channel It will thus be seen that we have provided a highly novel, simple, and extremely useful and eflicient folding trestle that is well adapted for all the purposes heretofore designated, even though we have herein shown and clescribed the invention as consisting of certain detail structural elements it is nevertheless to be understood that some changes may be made therein without affecting the spirit and scope of the appended claim.

Having thusdescribed the invention, what we claim as new and desire to secure by Le ters Patent is In a folding trestle of the character described, an elongated board member, a U- shaped channel bar arranged inverted position upon thebottom of said board, cross pins at the opposite ends of said channel bar, a pair of leg members loosely pivoted at their upper ends to each cross pin and adapted to l vers pivoted at their opposite ends to the between said legs for preventing the Weblegs and, to the adjacent side Wall of the chanbling of the legs upon their pins.

nel bar for maintaining the legs in perpendic In testimony whereof we affix our signa- 10 ular position when the same are swung into tnres. 5 right angular position with respect to-said channel bar, and a spacing collar loose upon JOHN D. THOMAS. each pin at the ends ofthe channel bar and JOHN E. HOLETON.

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