US2172794A - Composite strip construction - Google Patents

Description

Sept. 12, 1939. H. G. KELLOGG COMPOSITE STRIP CONSTRUCTION Filed dct. 4, 1957 IIVVENTOR B HOMER G. KELLOG 6.

WM ATTORNEY Patented Sept. 12, 1939 UNITE STATE ATENT FFME COMPOSITE STRIP CONSTRUCTION Application October 4, 1937, Serial No. 167,318

4 Claims.

This invention relates generally to composite strips and is a continuation in part of my copending application, Serial No. 644,650, filed November 28, 1932.

5 One of the principal objects of the present invention resides in the provision of a composite louver blade for radiator grills, or the like, having a main part and having an auxiliary part in the form of a finishing strip integrally united to the main part in such a manner that rattling, or

accidental disengagement of the parts is eliminated.

Another advantageous feature of the present invention which contributes materially to secur- 15 ing the foregoing results resides in the provision of a composite louver blade of the character set forth wherein the two parts are rolled to the desired contour and wherein the finish strip is rolled throughout its extent in intimate contact- 20 ing relation with the adjacent portion of the main part.

A further object of the present invention resides in the provision of a composite louver blade wherein the two parts of the blade are not only 25 simultaneously rolled to the desired cross sectional contour, but also wherein the finsh strip is rolled in assembled relation with the main part during the interval the two sections are contoured. This arrangement not only simplifies the 30 manufacture, but insures fashioning the finish strip to the same contour as the main part and also insures intimate, or tight engagement of the adjacent surfaces of the parts throughout the area of these surfaces.

35 The foregoing, as well as other objects, will be made more apparent as this description proceeds, especially when considered in connection with the accompanying drawing, wherein:

Figure 1 is a perspective view of a composite 40 louver blade constructed in accordance with this invention;

Figure 2 is an enlarged cross sectional view taken substantially on the plane indicated by the line 2-2 of Figure 1;

45 Figure 3 is an enlarged cross sectional view of a slightly modified form of louver blade construction;

Figure 4 is an enlarged cross sectional view of still another form of louver blade;

5 Figure is a plan View of a further embodiment of this invention; and

Figure 6 is a cross sectional perspective View taken substantially on the plane indicated by the line 6-6 of Figure 5.

55 In the embodiment of the invention illustrated in Figures 1 and 2, the reference character it] designates a composite louver blade having a main part I l and an auxiliary part E2. The auxiliary part I2 is secured to one longitudinal edge of the main part H, and is in the form of a finishing r, strip having a bright, or otherwise decorated exterior surface to enhance the appearance of the blade. In detail, one longitudinal edge of the blade is provided with a head it formed by bending the edge angularly with respect to the body 10 thereof and flattening the same to form a substantially T-shaped contour. The finish or trim strip l2 surrounds the head i3 of the main part and the free edges of the finish strip are arranged in interlocking engagement with the inner portions of the head 53 at opposite sides of the body portion of the main part I i.

In actual practice, the main part H of the blade is rolled to the cross sectional contour shown in Figure 2, and the finish strip 62 is rolled on the head portion 13 of the main part. Preferably, an apparatus similar to the one disclosed in my Patent No. 2,056,675, dated October 6, 1936, is employed to effect both of the rolling operations. In this apparatus, the finish strip is rolled to a predetermined cross sectional contour at the same time the main part is rolled, and the step of rolling the finish strip on the head of the main part is a continuation of the foregoing rolling operations. In other Words, when the blade reaches the final set of rolls, the finish strip is in assembled relation therewith and both parts may be fashioned to a particular longitudinal contour, if desired. As a result of the foregoing, the finish strip is in intimate surface contacting relation with the head I 3 of the main part throughout the area of the adjacent surfaces of the two parts and, as a consequence, there is no tendency for the parts to become disengaged, or to rattle, during use.

In the embodiment of the invention illustrated in Figure 3, the main part it of the louver blade is substantially channel-shaped having parallel side walls 15 and having a substantially T-shaped head I6. The head I6 is formed by bending the side walls l5 inwardly adjacent the base of the channel and flattening the base portion to provide the T-shaped contour. As a result of the foregoing, the side walls l5 are formed with 0pposed longitudinally extending grooves. I! adjacent the head It and the finish strip I 8 is assembled on the head with the longitudinal edges thereof extending into the grooves IT.

The main part I4 of the blade and the finish strip 8 are also formed by a rolling operation.

However, in this embodiment, the finish strip [8 is assembled on the base portion of the channelshaped main part l4 prior to the flattening operation so that the free longitudinal edge portions of the finish strip are tightly gripped between the opposed Walls of the grooves l1 during the rolling operation. In other words, the above construction ofiers the possibility of rolling the finish strip in interlocking engagement with the main part of the blade at the same time the two parts are rolled to a predetermined cross sectional contour and, as a result, the strips are firmly secured together in surface contacting relation, irrespective of variations in contour. Attention may be called to the fact that due to the working of the metal during the rolling operation, the width of the head portion I6 is less than the maximum width of the body portion of the blade and, in the present instance, the gauge of the finish strip approximates the difference in the width of the head and main portion of the part l4 so that the longitudinal edges of the finish strip will lie flush with the outer surfaces of the side walls l5.

In the embodiment of the invention illustrated in Figure 4, the main part IQ of the louver blade is substantially L-shaped having a body portion 20 and a flange portion 2|. The part I9 is rolled in such a manner that the flange portion 2| is connected to the body portion 20 by means of a laterally extending bent portion 22 forming a shoulder 23. The finish strip 24 may be rolled on the exterior of the flange 2| in much the same manner as described in connection with the first embodiment of this invention and the longitudinal edges of this finish strip are rolled in interlocking engagement with the shoulder 22 and the free edge portion 25 of the flange 2|.

In the embodiment of the invention illustrated in Figures 5 and 6, the main part 30 of the louver blade is curved longitudinally and is return bent at one longitudinal edge thereof in the manner designated by the reference character 3|. In manufacture, the main part 30 is rolled to the cross sectional contour illustrated in Figure 6 and the finish strip 32 is rolled on the return bent longitudinal edge 3| of the main part prior to longitudinally curving the main part. As a consequence, the finish strip 32 is curved to the same degree as the main part and intimate surface contacting relation is insured, irrespective of variations in the degree of curvature.

While several embodiments of the invention have been described somewhat in detail, nevertheless, it will be noted that in each instance the finish strip is permanently connected to the main part by a rolling operation so that an intimate contacting relationship exists between the adjacent surfaces of the strip and main part of the blade. As a result of the above, each of the constructions provide a composite louver blade wherein the finish strip is an integral part of the blade and will not rattle or become disengaged during use.

What I claim as my invention is:

1. In a louver blade construction, a main part having laterally spaced side walls and having a head at one longitudinal edge connected to the body portion of said part by inwardly return bent portions forming opposed grooves, and an auxiliary part receiving said head and having the opposite edge portions positioned in said grooves in such tight contacting relation with the adjacent side walls of the grooves to prevent relative movement of said parts.

2. In a louver blade construction, a main part having laterally spaced side walls and having a head at one longitudinal edge connected to the body portion of said part by inwardly return bent portions forming opposed grooves, and an auxiliary part rolled on the head of the main part with the longitudinal edge portions tightly gripped between the walls of said grooves.

3. In a louver blade, a rolled section having laterally spaced side walls and having a head connected to the side walls by opposed return bent portions extending inwardly from the side walls, and an auxiliary rolled section receiving said head and rolled on the head with the opposite longitudinal edges extending between the sides of the grooves in such tight engagement with said sides as to prevent relative movement of said parts.

4. In a composite louver blade, a longitudinally curved part having one longitudinal edge bent upon itself, and a substantially U-shaped correspondingly curved auxiliary part receiving the return bent edge with the adjacent surfaces of the latter and auxiliary part in such intimate contacting relation as to prevent relative movement of said parts.

HOMER G. KELLOGG.

Images