US1743327A

US1743327A - Structural metal member

Info

Publication number: US1743327A
Application number: US138436A
Authority: US
Inventors: Dornier Claudius
Original assignee: Dornier Metallbauten GmbH
Current assignee: Dornier Metallbauten GmbH
Priority date: 1925-10-10
Filing date: 1926-09-29
Publication date: 1930-01-14
Anticipated expiration: 1947-01-14

Description

Jan. 14, 1930. c; DORNIER 1,743,327

STRUCTURAL METAL MEMBER Filed Sept. 29, 1926 I mwuuu a metal structures and o Patented a... 114.1930

caaumus nomwmaor nmnmcnsnunn-on-rnnmonnnsnn, G RMANY, assrenon PRICE OF ONE-HALF TO DOBNIER-METALLBAUTEN GESELLSCHAET MIT BESCHBKKKTER HAFTUNG, OF FRIEDRICHSHAFEN-ON-TEE-BQDENSEE, GERMANY smnucrum 'mn'rar. MEMBER -App1ication filed September 29', 1926, SerlaiNo. 188,436, and in Germany October 10, 1925.

My invention refers to a novel kind of structural metal member which is particularly adapted for use as a spar or beam 1n the construction of aero lanes and other hght fi ers particular advantages over similar members hitherto used, as .far as mechanical strength and ease of construction are concerned.

The sheet metal members hitherto used in the construction of light metal spars or beams mostly involve the disadvantage of not being readily accessible from within, the provision ofapertures with ai view to the saving of weight being rendered difficult from a manufacturers point of view.

The structural member according to the present invention avoids these drawbacks, being composed of several parts having the form of a sheet metal bar of substantially angular cross-section;'the outer ends of the webs being bent so as to extend substantially at a right angle to the webs.

In the drawings aflixed to this specification and forming .part thereof a structural member embodying my invention is illustrated diagrammatically by way of example.

In the drawings Fig. 1 is a cross-section of such member, while Figs. 2 and 3 are a cross-section and a side elevation, respectively, of a spar orbeam constructed from two members of the kind shown in Fig. 1.

Figs. 4 and '5 are cross-sections of two further modifications of such spar or beam.

Referring first to- Fig. 1, the structural member has the form of a sheet metal strip.

a bent longitudinally at right angles, the marginal portions 'of the webs so formed being bent substantially at right angles 'so as to,

form flanges d and e. In the vertical web of the angular member are formed circular apertures c the edges of which are beaded in order to obtain an increase of strength.

- As shown in Figs. 2 and 3, two such memb rs are combined with each other and with a slgeet metal strip or plate f to form a'hollow beam, the parts being assembled by means of rivets. The interlocked flanges e serve for strengthening the corners of the beam.

As shown in Figs. 4 and 5, such beam can further be reinforced by forming one or both horizontal webs with semi-circular depressions or channels g, whereby reinforcing ribs are formed in the upper part of the beam.

The spar or beam thus obtained has an extraordinarily great mechanical strength in combination with particularly light weight.

The apertures 0 allow the easy introduction of riveting tools and the removal of water and oil which may have entered the beam, this being particularly advantageous in connectionwith flying boats and the like, 'the beams of which are constantly exposed to the sea water which is liable to cause a corrosion of the inner wall of the beam, unless removed in time.

Iwi'sh it to be understood that I do not deangles thereto, such strips. being arranged with their vertical webs parallel to each other and their horizontal webs overlapping each other and being secured together and beaded apertures formed in the vertical webs. 2. A structural metal member comprising two angular metal strips of substantially L- shaped cross-section, each comprising vertical and horizontal webs, flanges formed longitudinally of said strips and extending at right angles thereto, such strips being arranged'with their vertical webs parallel to each other and their horizontal webs overlapping each other and beingsecured together, beaded apertures formed in-the vertical webs and a channel-shaped depression being formed in one of the two overlapping horizontal webs. g r r 3. A structural metal member comprising two angular metal strips of substantially L- shaped cross-section, each comprising vertical and horizontal web's, flanges formed longitudinally of said strips and extending at right angles thereto, such strips being arranged with their vertical webs parallel to each other and their horizontal webs overlapping each other and being secured together, beaded apertures being formed in the vertical-webs and channel-shaped depressions formed in the two overlapping horizontal webs, said depressions extending on opposite sides so as to form a'tubular reinforcing member.

4. A structural metal member comprising two angular metal strips of substantially L- shaped cross-section, each comprising vertical and horizontal webs, flanges formed longitudinally of said strips and extending at right angles .thereto, such strips being arranged with their vertical webs parallel to each other, and their horizontal webs overlapping each other and being secured together, beaded apertures formed in the vertical webs, and a sheet metal member'extending in contact with and fixed to the flanges of both said strips. j

In testimony. whereof, I aflix my signature;

CLAUDIUS DORNIER.