US2461769A - Trestle - Google Patents

Description

J- L. POZUN ET AL TRESTLE Feb. 15, 1949 2 Sheets-Sheet 1 Filed March 3, 1947 John L. Pozun Le Roy Houghron and Feb. 15, 1949. POZ'UN 5 A 2,461,769

TRESTLE Filed March 5', 1947 2 Sheets-Sheet 2 Inventor John L. P0z un Le Roy Houghfon aura #24019 m Patented Feb. 15, 1949 John -l ozun andLe Roy Houghmn, iohnstewp Pa.-, .a ignors or one-third ,to .fHoward 0. Faust,

Application March a, 1947,. Serial -Nb. 73 23304 (Cl. eta-"5) ladder type for'holding scaffold boards, sit-selected heights, and which is especiallyladapted forpo'sitioning close to a building wallgbut is stabilized in the construction thereof against tilting away from the wall, when so placed, and is formed of I tubing and angle and channel iron, basically, in a in section, of our improved trestle in a, preferred embodiment thereof. ,4

Figure 2 is a view in rear elevation.

Figure 3 is a view in plan, with parts shown in section.

Figure 4 is a view in horizontal section taken on the line 4-4 of Figure 1.

Figure 5 is a view in vertical section taken on the line 55 of Figure 1.

Referring to the drawings by numeral, our improved trestle, as shown, comprises a base structure including a pair of opposed A-shaped, up-

right side frames 1, 2 diverging downwardly, relatively, and each embodying a straight top crossbar 3 and a pair of legs 4, 5, in each frame, diverging downwardly relatively, from the ends of the top cross-bars 3. The legs 4 constitute rear legs and the legs 5 front legs, for reasons presently apparent. At a suitable distance from the lower ends of the legs 4, 5 for stepping thereon from the ground, a side cross round 6 connects the legs 4, 5 of each frame I, 2, a similar, rear cross round I connects the rear legs 4, and another similar, front cross round 8 connects the front legs 5. Another front cross round 9 connects the front legs 5 substantially midway between the front round 8 and the top cross-bars 3. A pair of top angle bars l0 extending crosswise over the top corners of the side frames l, 2, and which are fitted over said corners and welded thereto, as at H, connect said side frames I, 2 together at the manner to render the same strong and safe, yet I tops thereofwith :the :top cross-bars v3 spaced apartva distance suitable .for a purpose presently apparent, Thesideframesl, 2 are formed :of metal tubing welded at the upper-corners of said frames, as at l2, the cross rounds 5,1, -8, :Svbeing similarlyformedand weldedinlplac'e, as at [3,:and the topanglebars 0 being formed-of simil'ar metal. Y n v A particula featureof; our invent-ion is that the rear.legs- 4;..-incline, downwardly and rearwardly at a slight angle to the vertical so that said rear legs may be placed close to a building wall,

represented at l4, close to a perpendicular position, whereas, the front legs 5 are inclined at a greater angle to the vertical downwardly and forwardly, which, together with the angle of divergence of the legs 4, 5 in each frame I, 2 serves to stabilize the described base structure against tilting away from the wall M, orsidewise.

The base structure described in the foregoing is designed to support an upright extension section in the form of a ladder l5 having tubular sides l6 andsimilar cross rounds I! welded to the sides, as at [8, and all formed of metal. The sides l6 areslidably fitted, for vertical adjustment of the ladder [5, between the top cross bars land-the top angle bars l0.

A channel-bar l9 extends between the rear and frontcross rounds I, 8 in the transverse center thereof, and serves as a rest for the lower ends of the sides"; when the ladder I5 is fully lowered. The channel b-ar I9 is welded, as at 20, to said cross rounds I, 8.

A pair of upright angle bars 2! arising from the channel bar IS with lower ends welded to said bar l9, as at 22, and upper ends, welded, as at 23, to the top angle bars Iii, serve as guides for the sides l6 of the ladder l5 in adjusting said ladder.

For supporting the ladder l5 in different adjusted positions, above the channel bar IS, a

. trough shaped keeper bar 24 is hinged to one top cross-bar 3 to be swung into bridging relation to said top bars 3 under a selected round I! of the ladder 5. The hinge for the keeper bar 24 comprises an edge hinge barrel 25 thereon, through which a pintle rod 26 extends with the ends thereof working in a pair of hinge barrel-s 21, welded, as at 28, to one top cross-bar 3 and between which the hinge 25 is fitted. As will be clear, when the keeper bar 24 is swung into bridging relation to said top cross-bars 3, the free side edge thereof rests upon the top crossbar 3 opposite the one upon which said keeper bar 24 is hinged.

As will now be manifest, the ladder I5 is designed to support on the rounds l'l thereof the usual scaffold boards, as represented at 29 in Figure 1. When it is desired to adjust the ladder l5, when held by the keeper bar 24, it is merely necessary to lift said ladder sufliciently to elevate a round off said keeper bar 24 so that said keeper bar may be swung out from under said round. The ladder 15 may then be adjusted, as occasion may require, and the keeper bar 24 swung under the appropriate round l1, after which said ladder may be lowered to seat the round in said bar. The'front cross rounds 8, 9 and the angle bar ID at the front of the base structure provide a ladder-section for mounting to the ladder l5. The rounds 6, 1 are solely brace members.

The foregoing will, it is believed, 'suflice to impart a clear understanding of our invention without further explanation.

Manifestly, modifications of the invention, as described, may be resorted to without departing from the inventive concept, and right is herein reserved to such modifications as fall within the scope of the appended claim.

What we claim is:

In a trestle of the class described, a pair of pposed base frames diverging downwardly relatively, and each including a top bar and a pair of legs diverging downwardly from the top bar, a pair of cross bar-s connecting said frames together at the top corners thereof in spaced apart relation, cross rounds connecting the legs of the opposed frames adjacent the bottoms thereof, a horizontal bar extending between said cross rounds, a pair of angle bars upstanding from said horizontal bar with channel sides facing, a ladder section with rungs and slidably fitted in said angle bars' to be slid into a position of rest on said horizontal bar and to be vertically adjusted off said horizontal bar, said ladder section slidably fitting between the pair of cross bars, and a trough-like keeper bar swingable on one top bar under rungs of said ladder section into bridging relation to said top bars to hold said section in adjusted position oil said horizontal bar.

JOHN L. POZUN.

LE ROY HOUGHTON.

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

UNITED STATES PATENTS

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