US2028353A - Frame corner structure - Google Patents

Description

Jan. 21, 1936. ERT I 2,028,353

FRAME CORNER STRUCTURE Filed April 8, 1955 Rob ris,

INVENTOR ATTORNEY.

Patented Jan. 21, 1935 UNITED STATES PATENT OFFICE FRAME CORNER STRUCTURE Application April 8,

1 Claim.

also to an article of manufacture and merchandise which constitutes an improved frame-cornermember.

One object of this invention is to provide an improved frame corner structure that is exceedingly strong, rigid and secure, and which can be produced and applied at slight expense.

exceedingly strong and rigid frame-corner-memher by forming the same froma blank of sheet metal, or from other rigid sheet material, by pressing the blank into the shape of a channelmember Whose channel-bottom is formed of parts that are substantially in angular relation to one another and which is continuous throughout its longitudinal and lateral extent, so that its rigidity is at the maximum for the required thinness of the sheet material.

Another object is to provide an improved knockdown frame structure which includes vertical and horizontal strips each having one end mortised and its other end square-cut, so the length can be reduced by merely square-cutting the originally square-cut end, thereby leaving the cornerjoints of the frame unchanged in the operation of reducing the dimensions of the frame; also to supply the knock-down frame with the abovedescribed frame-corner-members which will fit the adjoining ends of the frame-strips at whatever length they may be originally or after being square-cut.

Other objects and important features are pointed out or implied in the following detailed description, in connection with the accompanying drawing in which:

Fig. 1 is a perspective view of a frame-corner constructed and assembled according to this in- Vention.

Fig. 2 is a bracketed view showing in perspective and in full lines the correlated ends of a vertical frame-strip and a horizontal frame-strip separated, and the broken lines showing the vertical frame-strips normal position with respect to the horizontal frame-strip, a fragment of the cover-strip for a screen-edge being shown in a dropped position.

Fig. 3 is a perspective view of the frame-cornermember that comprises part of the assembly in Fig. 1.

Fig. 4 is a bottom plan view of the member shown in Fig. 3.

Fig. 5 is a longitudinal vertical sectional view Another object is to provide an improved and 1935, Serial No. 15,335

showing a modified form of the member shown 7 y in Fig. 3.

Fig. 6 is a cross sectional view along the line 6-6 of Fig. 5.

Referring to the drawing in detail wherein similar reference numerals refer to similar parts in the several views, the invention is described, in detail as follows:

The three essential parts of my frame corner structure are shown assembled, in Fig. 1, in their normal relation, the horizontal frame-strips square-cut end portion being indicated at ID, the greater part of this strip (including its mortised end) being omitted asif cut off at the end of the corner-securing member H which is here shown in its entirety; and the upper end-portion of the vertical frame-strip [2 having its mortise hidden by the adjoining square-cut end of the horizontal frame-strip; but, in Fig. 2, the mortise is defined by a vertical wall or surface 13 and a seat or surface I, and will be referred to hereinafter as a one-angle mortise or uni-rectangle mortise. The vertical depth of this mortise is equal to the width or vertical measurement of the horizontal frame-strip It], so the upper end of the vertical strip is flush or level with the upper surface of the horizontal frame-strip while the lower surface of the latter rests in its normal posit'on on the seat or surface I4 and the squarecut end surface of the strip I0 fits snugly against the vertical surface l3.

Each strip l0 and I2 has its opposite vertical sides formed with grooves or kerfs IS. The frame-corner-member l I is formed of a substantially quadrangular blank of rigid sheet material, preferably ductile sheet iron, steel, brass or aluminum, pressed into the shape shown, viz., into the channel-shape where the sides or walls are shown at I6 and I1 (in Figs. 1 and 2) and at 1711 (in Fig. 5). Each side or wall is formed with two securing flanges l8 turned laterally at right angles to the major part of the wall and extending at right angles to one another. From another aspect, there are two pairs of securing flanges, those of each pair being parallel and extending inward towards one another; and although they are shown in spaced relation to one another (in Figs. 1 and 3), to provide an opening or clear space l9, they may be adjoined and united for providing greater rigidity, and an opening Illa may be provided in lieu of the opening I9, or the openings I9 and Na may both be omitted in view of the fact that the sheet-material is ductile and soft and thin so that a sharp-pointed nail or tack can be driven through the walls at any chosen point. However, the walls and their flanges must have considerable rigidity, so it is quite within the scope of this invention to make the flanges double-thick by turning the edges of the blank upon the adjoining edge-portions before forming the blank into channel-shape. Moreover, the walls l6 and I! may be stiffened, as are the walls I la, by elongated bosses or ribs such as shown at l'lb and/or He, or of any desired shape and locality on the respective walls; but when the walls are of relatively thick and rigid material pressed or die-cast into shape, the bosses may be omitted, and any desired number of nailing openings may be provided through the walls, so nails may be passed therethrough when securing a screen-fabric and edge-protecting strip 20 (Fig. 2) in place.

A very important feature of this invention resides in the lateral and longitudinal continuity of the channel-bottom 2|22--23 (Figs. 1, 3 and 4) or 2|a22a-23a (Figs. 5 and 6), where it is seen that a substantially horizontal section 2| or Zia. merges with a substantially oblique section 22 or 22a that merges with a substantially vertical section 23 or 23a; the unity and continuity of these three sections making the channel bottom far more rigid than it would be if these three sections were in the same plane, or if any one of these parts or sections were not continuous laterally or from wall IE to wall I! or [1a to Hit. It is quite within the scope of this invention to form the part 22 arcuate, as indicated by the arcuate broken line in Fig. 3; also to form the member H or I la from two blanks in such man-' ner that they can be joined to one another by riveting, soldering, welding or otherwise securing them together at any appropriate part of the 5 channel-bottom 2l-22-23 or 2Ia--22a-23a.

While describing my invention specifically, it is not my intention to limit my patent protection to these specific and precise details, for the invention is susceptible of numerous changes with- 10 in the scope of the inventive ideas as implied and claimed.

What I claim as my invention is:

An article of manufacture and merchandise comprising a frame-corner-member of rigid sheet material constituting a channel-member having walls each including two securing-flanges disposed longitudinally at right angles to one another, each flange of one channel-wall being laterally disposed at right angles to the main part of this wall and projecting towards a similarly formed and arranged flange of the opposite channel-wall, said walls being connected by a channel-bottom which is laterally and longitudinally continuous and includes end portions substantially at right angles to one another and united with an intermediate portion that is substantially oblique to said end portions, whereby said walls are held in the maximum rigidity and stability with respect to one another.

WILLIAM FRANCIS ROBERTS.

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