US1681400A

US1681400A - Method for the production of expanded trussed beams

Info

Publication number: US1681400A
Application number: US742712A
Authority: US
Inventors: Harvey M Gersman
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-10-09
Filing date: 1924-10-09
Publication date: 1928-08-21
Anticipated expiration: 1945-08-21

Description

Aug. 21, 1928. 1,681,400

H. M. GERSMAN METHOD FOR THE PRODUCTION OF EXPANDED TRUSSED BEAMS Filed Oct. 9, 1924 Patented Aug. 21 1928.

UNITED STATES HARVEY M; GERSMAN, OF CHICAGO, ILLINOIS.

METHOD FOR-ITHE PRODUCTION or manner) rnussnn BEAMS.

Application filed. October 9, 1924. Seria1No. 742,712.

This invention relates to a method for the production of expanded trussed beams and more particularly forthe production of an expanded beam from an original rolled section, preferably an I-beam section.

The principal object of the invention is to provide a method by which a. novel and advantageous form of expanded trussed beam may be produced from an original integral section by procedure of simple and economical character and in which the application of heat is not required and the metal of the blank is not stretched. a

A further object is to provide amethod by which an expanded trussed-be-am produced from an original section which will have suflicient strength for all practical purposes and in which the an le of the struts may be selected as desired without any liability of fracturing.

The accompanying drawin s illustrate the practice of the method and an expanded trussed I-beam resulting therefrom.

Insaid drawings:

Figure 1 is an elevation of the slitted blank.

Figure 2 is a section on the line 22 of Fi ure 1.

Figure 3 is an elevation of the blank after the offsetting of the portions which provide the struts. v

Figure 4 is a section on the line 44 of Figure 3.

Figure 5 is an elevation of the blank after ex ansion.

igure 6 is a section on the line 6-6 of Fi ure 5.

Figure 7 is an elevation of the completed in Figures 1 and 2, which consists of a rolled I-beam shape of the usual or any desired section having a central planar web 1 and top and

bottom flanges

2 and 3. The web 1 is slitted in characteristic fashion to provide for expansion in accordance with the inven-' tion. Thus the web is provided with parallel diagonal slits/i which extend from points near one flange to points near the other and with short alinin longitudinal slits 5 which,

as shown, extend etween corresponding ends of adjoining slits 4. Therebytheslits 4 are connected in successive pairs adjacent one ofthe flanges with the result that the metal between the slits not connected has the form of continuous strands 6 and the metal between theconnected slits has the form of interrupt edor discontinuous strands, that isto say of tongues 7, which alterna e with the" strands 6. As shown and preferred the slits4 ten minate at points short of the flanges, there-by leaving beyondthe slits solid web portions 1 and 1 but, if desired, the slits a maybe continued right up to the flanges and these may be made of such thickness as mav be deemed advisable. The strands 6 are laterally ofl'set so as to lie in a common plane at the same side of the mean plane of the web. This ofi'setting of the strands is accomplished by a corrugating operation in the manner disclosed inmy pending application, Serial N 0. 642,872, that is to say the web is longitudinally channelled or corrugated in the portions constituted by the strands, the slits extending into andalong the sides of the chana nel or corrugation. The tongues 7' which, as shown, project fromthe solid portion 1, are. in like manner bent so as to lie in a common plane at the opposite side of the'mean plane of the web. The corrugating' and bending operations by which the strands and tongues are thus laterally offset whereby the blank has the form shown in Figures 3 and 4 may be performed in connection with the slitting or at a later stage. The strands and tongues are also preferably curved between their ends so asto have convex faces adjacent the mean plane of the web, as shown in Figure 4, and suchc-urving may be done at the time of slitting or at a later stage.

The blank is now ready for expansion and this is accomplished by moving the flanges in relatively opposite directions while maintainingtheir angular relation to the mean plane of the web whereby the strands are caused toapproach more nearly to perpendicular positions,- as shown in Figure 5. Such expansion of the blank follows generally the procedure outlined in my said pending application, Se rial No. 642,872 but produces no changein' the positionsof the tongues 7 and the beam is completed by bending the tongues in the general direction of their common plane so as to cause them to extend oppositely, that is: to say .in intersecting relation to the strands as produced by the expansion, after which the free ends of the tongues are suitably secured, as by spot welding, to the adjacent solid section of the web, the completed beam bein shownin Figures 7 and 8. Such bcnding o with the expansion or at a later stage. If de sired, and for the purpose ot providing a true lattice truss, the tongues and strands may be suitably secured, as by spot welding, to one another at their points of intersection, as indicated at 8 in Figure 7.

It will be obvious that the strands may be bent in the direction of their common plane to greater or less degree and that the degree to which the tongues are bent in their common plane will depend on the degree to which the strands are bent. As shown the strands have been bent to positions short of perpendicular and the tongues have been bent through and beyond perpendicular but if desired the strands may be bent through and beyond perpendicular in which casethe tongues will be bent to positions suitably short of perpendicular.

It will be observed that the angle of the struts are not limited by the ductility and elasticity of the metal and that any angle is practical without liability of fracture.

Instead of locating the short slits 5 at the ends of the diagonal slits & they may be lo cated as desired at points along the length of i the slits 4, for example at midway points.

Such location of the slits 5 will result in the discontinuous strands each being in the form of a. pair of originally alining tongues projecting from the respective solid portions 1 and 1 or from the

respective flanges

2 and 3 in case the solid portions are not employed. After expansion of the continuous strands as above described the originally alining tongues which, during expansion, have become relatively longitudinally ofliset, are bent back into alining relation and their ends connected by welding, the same welding operation being available to connect them to the continuous strands which they intersect.

Having fully described my invention, I claim:

1. A method for the production of an expanded trussed beam from a structural section having oppositely located flanges and a solid planar web integral with the flanges which consists in slitting the web to provide parallel diagonal continuous strands and interrupted strands parallel to and alternating with the continuous strands, in effecting the expansion of the web. in bending the interrupted strands from the positions in which they are left by the expansion into intersecting relation to the continuous strands and parallel relation to one another and securing the interrupted strands at their points of interruption to adjacent parts of the web.

2. A method for the productionof an expanded trussed beam from a structural section having oppositely located flanges and asolid planar web integral with the flanges which consists in slitting the web to provide parallel diagonal continuous strands and interrupted strands parallel to and alternating with the continuous strands, in relatively laterally offsetting the continuous and interrupted strands, in effecting the expansion of the web, in bending the interrupted strands from the positions in which they are left by the expansion into intersecting relation to the continuous strands and parallel relation to one another and securing the interrupted strands at their points of interruption to adjacent parts of the web.

A method for the production of an ex panded trussed beam from a structural section having oppositely located flanges and a solid planar web integral with the flanges which consists in slitting the web to provide parallel diagonal continuous strands and in terruptcd strands parallel to and alternating with the continuous strands, in eli'ecting the expansion of the web, in bending the interrupted strands into positions in which they may be secured at their points of interruption, and securing the bent interrupted strands at their points of interruption to adjacent parts of the web.

l. A method for the production of an expanded trussed beam from a structural section having oppositely located flanges and a. solid planar web integral with the flanges which consists in slitting the web to provide parallel diagonal continuous strands and interrupted strands parallel to and alternating with the continuous strands, in relatively latter-ally offsetting the continuous and interrupted strands, in eiiecting the expansion of the web, in bending the interrupted strands into positions in which they may be secured at their points of interruption, and securing the bent interrupted strands at their points of interruption to adjacent parts of the web.

5. A method for the production of an expanded trussed beam from a structural section having oppositely located flanges and a solid planar web integral with the flanges which consists in providing parallel diagonal slits in said web with the slits of successive pairs connected by longitudinal slits, thereby to provide continuous parallel strands integral at both ends with the web and interrupted strands alternating with the continuous strands, in relatively laterally oflsetting the continuous and interrupted strands, in relatively shifting the flanges to expand the portion of the web constituted by the strands, and in bending the interrupted strands to extend oppositely and in intersecting relation to the continuous strands and connecting the interrupted strands at their points of interruption to adjacent parts of the web.

6. A method for the production of an expanded trussed load bearing member from a structural section having a planar web which consists in providing parallel diagonal slits in said web with solid portions beyond the slits and the slits of successive pairs connected by longitudinal slits, thereby to provide continuous parallel strands integral at both ends with said solid portions and interrupted strands alternating with the continuous strands, in relatively laterally ofisetting the strands and the tongues, in relatively shifting the solid portions longitudinally in their common plane to expand the portion of the web constituted by the strands, and in bending the interrupted strands to positions wherein they may be attached at their points of interruption to adjacent parts of the web and in attaching said interrupted strands at their points of interruption to adjacent parts of the web.

7. A method for the production of an expanded trussed load bearing member from a structural section having a planar'web which consists in providing parallel diagonal slits in said web with the slits of successive pairs connected by longitudinal slits, thereby to produce continuous parallel strands integral at both ends with the web and interrupted strands alternating with the continuous strands, in offsetting the continuous strands and the interrupted strands laterally at opposite sides of the mean plane of the web, in relatively shifting the flanges to expand the portion of the web constituted by the continuous strands, and in bending the interrupted strands to positions wherein they may be attached at their points of interruption to adjacent portions of the web and in attaching the bent interrupted strands at their points of interruption.

8. A method for the production of an expanded trussed load bearing member from a structural section having a planar web which consists in providing parallel diagonal slits in said web with the slits of successive pairs connected by longitudinal slits, thereby to produce continuous parallel strands integral at both ends with said web and interrupted strands alternating with the continuous strands, in forming a longitudinal channel in the portion of the web constituted by the continuous strands with the ends of the slits extending into the sides of the channel, thereby to oliset the continuous strands laterally with respect to the mean plane of the web, in relatively shifting the flangesto expand the portion of the Web constituted by the continuous strands, and in bending the interrupted strands to positions wherein they may be attached to adjacent portions of the web at their points of interruption and in attaching the bent interrupted strands at their points of interruption to adjacent portions of the web.

9. A method for the production of an expanded trussed load bearing member from a structural section having a planar web which consists in providing parallel diagonal slits in said Web with the slits of successive pairs connected by longitudinal slits, thereby to produce parallel strands integral at both ends with the web and interrupted strands alternating with the continuous strands, in forming a longitudinal channel in the portion of the web constituted by the continuous strands with the ends of the slits extending into the sides of the channel, thereby to offset the continuous strands laterally with respect to the mean plane oi the web, in laterally ofisetting the interrupted strands at the opposite side of the mean plane of the web, in rela tively shifting the flanges to expand the portion of the web constituted by the continuous strands, and in bending the interrupted strands to positions wherein they may be attached to adjacent portions of the web at their points of interruption and in attaching the bent interrupted strands at their points of interruption to adjacent portions of the web.

10. A blank for use in the production of an expanded trussed load bearing member con sisting of a rolled structural section having a planar web provided with parallel diagonal slits with the slits of successive pairs connected by longitudinal slits, thereby to provide continuous strands and interrupted strands alternating with the continuous strands.

11. A blank for use in the production of an expanded trussed load bearing member consisting of a. rolled structural section having a planar web provided with parallel diagonal slits with the slits of successive pairs connected by longitudinal slits, thereby to provide continuous strands and interrupted strands alternating with the continuous strands, the continuous strands and the interrupted strands being relatively laterally offset.

12. In the production of an expanded trussed load bearing member from a structural section having a planar web, providing parallel diagonal slits in said web with the slits of successive pairs connected by longitudinal slits thereby to produce continuous strands and interrupted strands alternating with the continuous strands, relatively laterally ofl'setting the continuous strands and the interrupted strands, and relatively moving the flanges to alter the angle and increase the mutual spacing of the continuous strands.

13. A blank for use in the production of an expanded trussed load bearing member consisting of a rolled structural section having a planar web provided with parallel diagonal slits and solid portions beyond the ends of the slits with the slits of successive pairs connected by longitudinal slits, thereby to provide continuous strands and interrupted strands alternating with the continuous strands.

In testimony whereof I aiiixmy signature.

HARVEY M. GERSMAN.