US781068A - Metal frame. - Google Patents

Description

No. 731,068'. PATENTED JAN.31,`1905..

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METAL FRAME.

APPLICATION-FILED MAB.. 23, 1904.

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Patented January 31, 1905.

PATENT OEEICE.

EDWARD R. HEWI'IT, OF NEW YORK, N. Y.

METAL FRAME.

SPECIFICATION forming part of Letters Patent No. 781,068, dated January 31, 1905.

Application filed March 23, 1904:.y Serial No. 199,662.

To. @ZZ whom it may concern:

Be it known that I, EDWARD R. HEWITT, a citizen ofthe United States, residing at the city of New York, in the borough of Manhattan and State of New York, have invented certain new and usefulImprovements in Metal Frames, of which the following is a full, clear, and exact description.

This invention relates to the construction of frames from steel or metal of irregular crosssection, and has special referenceto the formation of an angle between two meeting lengths vof steel or metal having an L-shaped crosssection.

It will be seen at once that it is not an easy problem to join strips which arel L-shaped in I cross-section so as tohave the same strength at the angle as exists at any point in the length of either strip without producing a cumbersome and unsightly job. The difiiculty is caused by the fact that the two horizontal webs and the two vertical webs are to be se'- cured together in pairs, and the L-shaped metal does not readily lend itself to such a connection. 'Ihe manner in which this is accomplished by me will be described with reference to the accompanying drawings, in which- Figure 1 is a plan of the angle constructed according to my invention. Fig. 2 is a perspective view thereof. Fig. 3 is a perspective view of the end of one of the members of they anglereadyfor'joining with the end of the other member. Fig. 4 is a side elevation of thev angle as viewed in the direction of the arrow, and Fig. 5 is a section on line m m of Fig. 1.

Referring to the drawings by letter, A and B, respectively, represent the ends of` two strips of steel o'r other metal having an L- shaped section.` The horizontal member of the strip A is indicated by c@ and the vertical member of the same strip by a. The horizontal member of the strip B is indicated by Z) and the vertical member by 'Io prepare these strips for joining to form an angle, I

, first take, say, the strip A and sever. the horihorizontal plane coincident with the under zontal web a from the vertical web a along a face-of the horizontal web and to a distance somewhat greater thanvthe wid th of the horizontal web or from the point 1 to the point 2.v

I then bend the vertical web a laterally on a vertical axis until it stands at an angle with the length of the strip corresponding with the angle to be formed, the deflected web being shown at 3. In a similar manner I prepare the end of strip B---that is, by irst slitting the vertical web from the horizontal web on a lvertical plane coincident with the inner face of the vertical web or from the point 4: to 5 and then bending the end of the vertical web laterally on a vertical axis to an angle with the strip corresponding with the angle to be formed, as seen at 6. The bend, however, in the latter case is of larger radins than that in the former case-that is to say, the concave surface of the bend 6 will be of substantially the same radius as the convex surface of A and vice versa, the deflected vertical web 3 of the stripA against the outer face of the undeflected web 2) of the strip B. Thus the .two horizontal webs overlap and the two vertical webs overlap. The overlapping members are now riveted together, the horizontal members by the rivets e and the vertical members by the two sets of rivets f and g. By securing the horizontal webs together the strength of those webs in the straight strip is extended to the angle, and by securing the vertical webs together their function is likewise extended to the angle, but in a double sense, for the parts held together by the rivets f serve to resist strainsor stresses in one di? rection, while the parts held together by the rivets g serve to resist the stresses along other directions. The angle therefore becomes very strong, and this is accomplished without the -aid of fish-plates, angle-irons, or extra pieces of any character. b

The fact that the horizontal members are placed one on top of the other makes it necessary to sever one of them from its corresponding vertical member on a horizontal plane and to sever the other on a vertical plane, so that when the angle is assembled the upper edges of the two vertical webs will be flush, as seen at 7.

In the illustration of the angle the deeeted parts 6 and 3 are longer than the distance between the points 4 and 5 or l and 2. The purpose of this is to have the parts 3 and 6 long enough to afford the necessary strength after riveting and to allow for the bends.

Having described my invention, I claim4 l. An angle formed by the meeting of two strips, each substantiallyL-shaped in crosssection, both of the webs of one strip being overlapped upon, and directly secured to, the respective corresponding webs of the other strip.

2. An angle formed by the meeting of two 2O strips, each L-shaped in cross-section, a portion ofthe vertical web of each strip being severed from its corresponding horizontal web and deflected laterally to overlap the undelected portion of the vertical web of the opposed strip.

3. An angle formed by the meeting oi two strips, each L-shapcd in cross-section, a portion of the vertical web ot' one strip being Severed on a horizontal plane from its eorresponding horizontal web, and a portion o1 the vertical web of the other strip being severed on a vertical plane from its corresponding horizontal web, said severed vertical portions being deflected and overlapping each other.

In witness whereot` Isubscribe my signature in presence oi two witnesses.

EDWARD R. I'IEVVITI.

Vitnesses:

FRANK S. OBER, VVALDo M. CHAPIN.

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