|Publication number||US1994716 A|
|Publication date||Mar 19, 1935|
|Filing date||May 12, 1932|
|Priority date||May 12, 1932|
|Publication number||US 1994716 A, US 1994716A, US-A-1994716, US1994716 A, US1994716A|
|Inventors||Wolfgang B Klemperer|
|Original Assignee||Goodyear Zeppelin Corp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (27), Classifications (8)|
|External Links: USPTO, USPTO Assignment, Espacenet|
March 19, 1935.
w. B. KLEMPERER GIRDER Filed May 12, 1932 Patented Mar. 19, 1935 UNITED STATES PATENT orrics r v v Gianna I Wolfgang B. Klemperer,. Silver Lake, Ohio, as-
signor to Goodyear-Zeppelin Corporation,
Akron, Ohio, a corporation of Delaware Application May 12, 1932, Serial No. 610,867
The present invention relates to girders of the box type and more particularlyrelates to light-' a hollow beam or girder the individual strips being lightened by removing portions of the metal to form a truss so that the total weight of the girder is substantially reduced Without depreciable weakening thereof. The openings formed in the trusses are flanged so that the trusses and girder are better adapted to, resist strain. Moreover, as disclosed in said patent, it has been the practics in this art to flange the sides of the individual trusses and'to bend them'in such forms that the sides or edges of the trusseswhen joined together to form a girder provide individual tubular or semi-polygonal corner portions which increase the strength of the girder. n
'It has been found that in box-type girders, corners which are tubular or polygonal in crosssection materially increase the strength of the girdenas awhole and particularly adapt it, to resist compressional stresses without buckling, such resistance very nearly approaching the yield point of the material from which the girder is fabricated. Without corner constructions of this type it has been found thatcornpressional stresses will cause buckling considerably "below theyield point of the material forming the truss and girder.
However, when the corners of the. individual trusses are initially formed so that the finished composite girder will have corners of circular or polygonal shape, considerable difliculty is experienced in securing the individual trusses together inassembled relation and also in securing the finished girders into a framework. This is because the trusses are ordinarily secured together at their sides or-edges usually by rivets, and this securing or riveting operation'is greatly interfered with and sometimes renderedimpossibleby the shape of the corners or edges of the trusses. 7
It is an object of the present invention to avoid and overcome the aforementioned difiiculties of the prior art and-t0 provide a hollow or box girder construction which is particularly adapted to resist stresses such as produced in compression.
Another object of th invention is to provide a box girder made up of individual strips or trusses with filler or bridging plates positioned across the corners thereof, whereby a very light,
strong girder is produced;
Another object of the invention is to provide a box girder made up of individual strips or trusses wherein the corners are formed circular or polyg onal in cross-sectionbut in which the individual strips or trusses can be very readily riveted or secured together at their edges to form a composite girder.
Another object of the invention is to provide a box girder with reinforced corners, which girders can readily be jointed at their ends with othe girders by riveting orthe like} Another object of the invention is to provide an improved girder. v I l The foregoingand other objects of the inven tion are achieved by the girder construction de.- scribed below and, illustrated in the accompanying drawing, wherein V V Fig. 1 is a fragmentary side elevation, of one form of girder embodying the principles. of. the invention; 7 v v I n v f Fig. 2 is a oross-scctional view ..taken on. line IIII of Fig. 1;
Fig. 3 is a side elevation illustrating the princi ples of the invention applied to another fornrof hollow box girder; v
Fig. 4 is a cross-sectional View taken on line IVIV of Fig. 3;
Fig. 5 isva side elevation, on a larger scale, 0 a corner or bridging stripv employed in practicing the invention; 7 v
, Fig. 6 is a cross-sectional view taken on line VI-VI of Fig. 5, and
Fig. 7 is an elevation of how the girders comprising the present invention are joined together.
Referring more particularly to the drawing, the box girder illustrated in Figs. 1 and 2 comprisesfour individual truss members 11, 12, 13 and 14. each of which is provided with aseries of large openings 16 and small openings 17. The edges of these openings. 16' and 17 are pressed or otherwise turned outward to provide flanges for purpose of reinforcement is the usual-practice in this art. Furthermore, the longitudinal edges of the individual trusses or strips 11, 12, 13 and 14 are olfset or'otherwise formed with flanged portions 20, 21, 22 and 23 respectively (see- Fig; 50E
2) which portions cooperate in overlapping relation to form semi-polygonal corners of the composite girder. Rivets 25 or other suitable means secure the individual trusses together at the corners as will be apparent from the drawing. 55
a joint illustrating Addition filler or bridging plates 30 also connect the adjacent truss plates, spanning the offset corner portions thereof, rivets 31 being employed to secure said plates 30 in position. These filler or bridging plates 30 are provided with a plurality of openings 32 for lightness of weight, said openings as well as the edges of the filler plates 30 being appropriately flanged for strengthening the same, as indicated at 33 and 34 respectively. The construction of the filler or bridging plates 30 is illustrated particularly in Figs. 5 and 6 of the drawing wherein one of them has been independently shown on a larger scale.
Another embodiment of the invention is illus trated in Figs. 3 and 4, wherein the numerals 40, 41 and 42 indicate generally individual strips or trusses which have been united along their edges to form a composite hollow girder, these individual strips or trusses being provided with flanged openings 43 and 44 similar to those of the firstdescribed embodiment. The edges of the individual trusses 40, 41 and 42 may be secured together in any one of a number of different ways, dependent upon the shape of the edges. In the triangular girder illustrated, corner channels 46 are provided to connect the adjacent truss plates, the individual trusses being secured to legs of the channel as by rivets 47. Bridging or. filler plates 30, formed in the manner described above, are employed across the corners of this composite triangular girder, the same being held in position by rivets 50.
As illustrated in Fig. '7, when the girders are joined together, as by gusset plates 54, the corner .pieces or bridging members 30 are terminated short of the ends of the girders as at 55 so that the operation of, joining the'ends of individual girders together is greatly facilitated. The bridging members 30 are ordinarily terminated at substantially the beginning of the'gusset plates 54 as at 55 but it ha's b'een found advisable in certain installationsto extend the members slightly by the endsof the gusset plates as at 55 to permit the ends of the members to be riveted to the gusset plates.
From the foregoing it will be seen that by providing filler or bridging plates in the suggested manner it is possible to form hollow box girders made up from a plurality of individual strips or trusses, wherein thercorners are circular or polygonal in cross-section. By providing suitable openings in the bridging or corner filling strips, it is possible to rivet the individual trusses together with little or no diificulty after the bridging plates are in position. It is, moreover, possible to first secure the individual trusses into the composite girder and to thereafter bridge the corners with suitable filler pieces of the type disclosed herein.
It will be appreciated that fillerstrips can be applied to hollow box girders of substantially any type or size whereby the same are materially strengthened with very little increase in weight. The filler strip can itself take a number of difierent shapes and can be readily adapted to bridge polygonal, semi-circular, triangular, or other shaped corners, in accordance with the teachings of the present invention.
Again it is possible to secure the individual trusses together by means other than rivets, as will be apparent, and similarly the bridging or filler strips can be secured in position by other means.
While several embodiments of the invention have been described above and shown in the drawing, it will be appreciated that this is forpurposes of illustration onlyand that the invention is limited only by the scope of the appended claims.
WhatIclaim is: .:v 1,
1. A hollow box girder comprising a plurality of trusses secured together along their edges to form a girder polygonal in cross-section, with certain of the trusses being shaped so thatthe corners of the girder will form small, individual semi-polygonal columns, and bridging members associated with the trusses and secured across each of the corners of the girder and extending longitudinally thereof and closing the semi-polygonal columns at the corners, said bridging members having their extreme edges formed substantially perpendicular to the adjacent body portion, said trusses and bridging members being: formed with openings therethrough in order to.
ligten the same and to allow the trusses to. be secured together. I 2. A girder comprising a plurality of trusses secured together along their .edges to 'form a girder polygonal incross-section, the trusses be? ing shaped so that the corners of the girder. will form small, individual semi-polygonal columns, and bridging members associated with the trusses and secured across eachof the corners of the. girder and extending longitudinally thereof and closing the semi-polygonal columns at the corners. 3. A girder made up of a plurality of individual. strips securedtogether at their longitudinaledges to form a hollow body, and bridging means ex-- tending across each of the corners of the hollow:
body to reenforce the securing points of the strips.
4. A beam for use in aircraft orthe like, comprising three or more thin metal strips formed with weight reducing openings therein and having edge portions adapted to be secured together in overlapping relation, said, edge portions forming partial columns at the corners of the beam,,
and corner members extending across the corners of the beam and closing the columns, said bridg- '1 ing members having their extreme edges formed substantially perpendicular tosthe adjacent body portion.
the girder and extending longitudinally thereof, and closing the semi-polygonal columns .at the corners, said bridging members terminating short of the ends of the girder;
. ,50 5. A girder comprising a plurality of trussessecured together alongtheir edges to form a girder 6. In combination, a plurality of girders, p ')lyg-- onal in cross-section, gusset plates connecting said.
girders together at their ends to form a joint, individual bridging members placed across each corner of each girder and extending longitudi nally thereof, said bridging membersterminating short of the joint at substantially of the gusset plates.
WOLFGANG B. KLEMPERER.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US2424875 *||Dec 9, 1943||Jul 29, 1947||Curtiss Wright Corp||Reinforced propeller blade|
|US2731824 *||Dec 10, 1952||Jan 24, 1956||hadley|
|US3067844 *||Mar 31, 1953||Dec 11, 1962||Mauritz Hunnebeck Emil||Network of single rods welded together at their junctions|
|US4003168 *||Jun 27, 1975||Jan 18, 1977||Walter Kidde & Company, Inc.||Crane boom of trapezoidal boom sections having reinforcing rings|
|US4016688 *||May 27, 1975||Apr 12, 1977||Fmc Corporation||Extensible crane boom structure|
|US4216632 *||Oct 11, 1978||Aug 12, 1980||Reynolds International, Inc.||Support member and method of manufacture|
|US5592848 *||May 10, 1995||Jan 14, 1997||Bodnar; Ernest R.||Method of simultaneously forming a pair of sheet metal structural members|
|US5669197 *||Aug 4, 1994||Sep 23, 1997||Bodnar; Ernest Robert||Sheet metal structural member|
|US5809724 *||May 10, 1995||Sep 22, 1998||Rotary Press Systems Inc.||Construction panel and method of constructing a level portion of a building|
|US6122888 *||Sep 22, 1998||Sep 26, 2000||Rotary Press Systems Inc.||Construction panel and method of constructing a level portion of a building|
|US6708459 *||Dec 7, 2001||Mar 23, 2004||Gcg Holdings Ltd.||Sheet metal stud and composite construction panel and method|
|US6837013 *||Oct 8, 2002||Jan 4, 2005||Joel Foderberg||Lightweight precast concrete wall panel system|
|US6837446 *||Jan 16, 2003||Jan 4, 2005||Sprayer Specialties, Inc.||Unitary boom structure|
|US7028439||Sep 28, 2004||Apr 18, 2006||Joel Foderberg||Channel-reinforced concrete wall panel system|
|US7231746 *||Jan 29, 2004||Jun 19, 2007||Bodnar Ernest R||Sheet metal stud and composite construction panel and method|
|US7866112 *||Oct 31, 2006||Jan 11, 2011||Dennis Edmondson||Slotted metal truss and joist with supplemental flanges|
|US8006450||May 31, 2005||Aug 30, 2011||Plastedil S.A.||Composite floor structure with a protruding bar upper portion in a floor element groove|
|US20040065043 *||Oct 8, 2002||Apr 8, 2004||Joel Foderberg||Lightweight precast concrete wall panel system|
|US20040182041 *||Jan 29, 2004||Sep 23, 2004||Bodnar Ernest R.||Sheet metal stud and composite construction panel and method|
|US20050050825 *||Sep 28, 2004||Mar 10, 2005||Joel Foderberg||Channel-reinforced concrete wall panel system|
|US20050229523 *||Oct 27, 2003||Oct 20, 2005||Bodnar Ernest R||Steel stud with openings and edge formations and method for making such a steel stud|
|US20060075701 *||May 31, 2005||Apr 13, 2006||Plastedil S.A.||Composite construction element, in particular for manufacturing floor structures and wall structures for buildings and method for manufacturing the same|
|US20060075707 *||May 31, 2005||Apr 13, 2006||Plastedil S.A.||Floor structure|
|US20070056245 *||Oct 31, 2006||Mar 15, 2007||Dennis Edmondson||Slotted metal truss and joist with supplemental flanges|
|US20070175149 *||Jan 11, 2007||Aug 2, 2007||Bodnar Ernest R||Stud with lengthwise indented ribs and method|
|US20120217352 *||Aug 30, 2010||Aug 30, 2012||Oglaend System As||Length Profile Device|
|WO2006069435A1 *||Dec 14, 2005||Jul 6, 2006||Bodnar Ernest R||Floor system with steel joists having openings with edge formations and method|
|U.S. Classification||52/634, 52/845|
|Cooperative Classification||B64C2001/0081, Y02T50/433, B64C1/065, B64C2001/0072|