Патент USA US2136420код для вставки
NOV. 15, c. |__ EDWARDS QOLLAPSIBLE TRESTLE ‘2,136,420 Original. Filed Nov. 27, 1936 i. .5”.,“w, Attorney. Patented Nov. 15, 1938 . ' 2,136,420 3 UNITED v'STMI'E,5'? PATENT OFFICE? Application November- 27, 1936, Serial No. 112,908 . Renewed April 7; ‘1938 . ‘ ~ 4 Claims. ’ (c1. ‘so4_5) This invention relatesto certain new. and use ful improvements in collapsible trestles, the :pe culiarities of which will be hereinafter fully de wise. The brackets are thus'rigidly secured to their respectivelegs. Their matching transverse arms 2-2’ are pivotally connected by a remov able bolt 8'. Spaced holes in said transverse arms :More speci?cally my improvements relate allow of varying the transverse distance between .5 .mainly to connecting corner brackets on sup- 7 the longitudinal arms 3—.—3"of the brackets so as scribedand claimed. ‘ porting'legs,’ each pair of. said brackets having transverse arms pivoted together and longitudinal arms engaging the side edges of a longitudinal ,10 plank connecting opposite pairs of corner brackets . on. their supporting, legs. to receive planks of different width.» A wide plank may thus be used as’ a bench by. a carpenter or plumber. I‘ - ~ ,, This cornerbracketiis preferably made from _ rolled plate 1 metal '(Fig. 5). that can be cut to of ahorizontal connecting plank with the adjacent the desired shape and the holes punched by stampingdies; then'bent at right angles to the dotted line Fig. 4, to right orleft, to form the 15 pair of supporting legs; and second, for a trestle that is vstrong, adapted for use by masons, car -In its ?at. shape shown in; Figs. 4 and 5, the The main objects of my invention areto pro- _ - vide means ?rst, for securely engaging each end right or left bracket shown in Fig, 3. ll, penters and others, is practically indestructible in , two arms ,Z-Vand 3, point in opposite directions in ordinarycircumstances, and can be readily, taken ,the same plane but unaligned with each other, apart, occupies small space in transportation, and and are connected by an integral lateral extension from the inner ends of saidarms, which exten In' the accompanying ‘drawing in’ whichlike' sion is common to both the arms. The portions reference numerals indicate corresponding parts: oisaid extension on opposite sides of a medial '20 can be quickly set up for, use. vFig. 1 represents a side elevation ofa trestle embodying my invention; 25 , ’ ' ‘ Fig; la, an enlarged detail‘ on the section line Ia,—la, Fig. l. i e Fig. 2, an end ‘view of Fig. 1; ' Fig. 3, an enlarged detail in isometric projec tion of a .pair of supporting legs and their con 30 necting corner brackets; Fig. 4, a face view of a corner bracket as stamped from metal plate in its ?at condition before bend ing at right angles on the dotted lines; and Fig. 5, a vertical edge view of the same in 35 said ?at condition. ' Referring to the drawing, the numerals I—l’ designate a pair of supporting legs of angle iron or other suitable shape, disposed substantially ver tical in a transverse plane and slightly inclined 40 in longitudinal planes as desired. On the top end of these legs is securely mounted by rivets or otherwise, corner brackets consisting of ?at plate arms 2 and 3, at right angles to each other in transverse and longitudinal position respectively, from the meeting corner 4. The longitudinal arm is preferably at a higher level than the trans verse arm to allow the longitudinal connecting plank 5 to project as shown in Fig. 1, as is usual in such trestles; but they may be otherwise dis posed. Although in different horizontal planes, both these arms have de?nite downward exten sions 8—-1 in planes meeting at right angles on said corner 4 to forma downward angle exten sion of said arms that corresponds to the angle leg that is secured thereto by rivets or other-‘ dotted line, form ?anges 6 and 'I of a right, angle'extension when the ?at shape, is bent on this line. so as to adapt‘ the bracket for fasten ingto the respective supporting leg angles l—l' as shown in Fig. ‘2. .The arms 2. and 3 respectively integral with the ?anges 6 and ‘I, are thus dis posed in planes at right angles to each other, the arm 2 being adapted for pivotal connection with the corresponding transverse arm 2' oi.’ the opposite bracket as previously described, and the arm ,3 being disposed longitudinal to the trestle andadapted for ‘supporting the plank interposed between arms 3——~3’. ' w 35 The bracket may be otherwise made, but in vestigation indicates the stated method as being cheaper and preferable forproduction in quality. The horizontal arm 3 is ?at like the pivoted arm 2, and angle extensions 9—'9’ are riveted or otherwise secured to the respective arms 3-3’ which are disposed parallel and opposite each other, so that their horizontal ?anges support said interposed plank 5, while the vertical ?anges, slightly inclined inward (Figs. 2 and 3) grip the 45 side edges of the plank. Such gripping engage ment is supplemented by pointed rivets l0 (Fig. 3) having shoulders ?tting against the ,inner face of said ‘vertical ?anges and the reduced shank extending through the ?ange and adjacent 50 arm and headed on the outside in the usual manner. Thus two or more pointed rivets in each of the arms 3—3' secure the extensions 9—9’ rigidly to the arms and also provide posi tive engaging means for the plank. 65 2 2,136,420 Swinging the legs |—-l' on the pivot bolt 8 toward each other, will widen the space between the angle extensions 9—9' for placing the plank between them. Then, spreading said legs will force the points I 0 into positive engagement with the plank. The legs are thus braced outward by a spreader bar I I, pivoted to one leg and having notch-es near the other end, one of which engages a stud pin l2 in the opposite leg, as shown in 10 Fig. 2. A‘ similar notched bar II’ near the re mote ends of the extensions 9-9’ also serves as a connector to hold the adjacent points Ill en gaged with the plank after they have been forced into it by hammer blows or otherwise. 15 Fig. 1a shows this bar H’ engaged with the stud pin 12’ in the horizontal ?ange ‘of the adja cent angle extension. _ ' Fig. 3 shows the preferred construction having the upper faces of the horizontal ?ange of the 20 angle extensions 9—-9', and the adjacent top of the lower .plate arms 2—.-2’, disposed substan tially in the same plane so as to- be even with each other and thus contact with the bottom of the inserted plank .so that both. assist in sup porting’ it. . . The legs may be lengthened vas indicated in Fig. 1, by bolting an angle or other piece to said legs. In using such a trestle on a sloping roof for instance, one of the legs of each .pair is 30 lengthenedgas much as required by the. slope. ‘A diagonal brace 13 from the end of an angle extension downltor the adjacent leg (Fig. 1) may be used when the legs are of such length that stiifening them, or the middle of the ‘plank, is " desirable. When collapsing the trestle, the spreader bar H‘ and connectorbarjll’ are disengaged from their stud pins, and the 'pivot bolt 8 removed in-each pair, so that the dismantled members take 40 up comparatively'little room in transportation or storage' " ' Having thus ‘fully vdescribed my invention what 45 corner bracket consisting of a ?at rolled plate having arms bent at right angles to each other, one arm being above the other arm and riveted to the vertical ?ange of said angle support so that the horizontal ?ange of said support is even Cl with the lower arm of the said bracket, and said lower arm having spaced holes for variably piv~ oting to a matching arm of an opposite bracket, and a downward angle extension from said arms riveted to said angle leg whereby said leg and 10 horizontal angle support are rigidly connected substantially as described. 2. A collapsible trestle having in combination, horizontalparallel opposing angle supports for an inserted. plank, means for pivotally adjusting the ‘space between said supports to grip the inserted plank, and a notched bar pivoted under the end of one support and having notches near its other end variably engaging a stud pin projecting below the opposite support to tie the ends of said sup- > ports in gripping position, substantially as de scribed. 3; In a collapsible trestle the herein described pair of corner brackets having arms respectively pivoted together disposed transversely to the - trestle, and each. bracket characterized-by an arm at right angles to and, higher up than, its trans versearm and adapted to support an interposed plank,.and both arms .of respective brackets hav ing downward extensions forming ?anges in adapted to be secured to respective supporting legs, substantially as described. '4. In 1a collapsible trestle the ‘herein described pair of corner brackets having ?at metal plate "’ arms with spaced holes for adjustably pivoting together transversely to the trestle and each bracket characterized by a-plank-supporting arm at right angles to and higher up than its trans verse arm, and both arms of respective brackets having integral downward extensions forming ?anges at right angles to each other in planes I ‘claim as new and desire to secure by Letters meeting on a corner‘and adapted to be secured Patent, :is: to respective supporting legs, substantially‘as de scribed. ' 1. A collapsible trestle having in combination, a vertically disposed angle'iron leg, a horizontal angle" iron support for a plank, and a connecting so ‘ planes meeting at right-angles on a corner and CHARLES L. EDWARDS.