US2673390A

US2673390A - Method for fastening workpieces to metal plates

Info

Publication number: US2673390A
Application number: US110858A
Authority: US
Inventors: Broberg Georg Karl Johan
Original assignee: SVENSKA FIAKTFABRIKEN AB
Current assignee: SVENSKA FIAKTFABRIKEN AB
Priority date: 1948-08-28
Filing date: 1949-08-17
Publication date: 1954-03-30
Anticipated expiration: 1971-03-30

Description

March 30, 1954 G. K. J. BROBERG 2,673,390 METHOD FOR FASTENING WORKPIECES TO METAL PLATES Filed Aug. 17, 1949 2 Sheets-Sheet 1 g'wyf/fjhzfimaj WW 4 BY W March 30, 1954 METHOD FOR FASTENING WORKPIECES TO METAL PLATES Filed Aug. 17, 1949 G. K. J. BROBERG 2 Sheets-S heat 2 2 5 T 1 V" K ,Z"

- INVENTOR/ w zw Mala ATTORNEY Patented Mar. 30, 1954 METHOD FOR FASTENING WORKPIECES TO METAL PLATES Georg Karl Johan Broberg, Solna, Sweden, as-

signor to AB Svenska holm, Sweden Flaktfabriken, Stock- Application August 17, i949, Serial N 0. 110,858

Claims priority, application Sweden August 28, 1948 3 Claims. 1

This invention relates to a method for fastening an edge of a work-piece to the surface of a sheet metal plate or the like.

The object of the invention is to provide a simplified and cheap way of fastening an edge of a work piece to the surface of a sheet metal plate. According to hitherto known methods, welding or soldering has been utilized for such fastening operations, which has meant a complication of the manufacture, or the use of such complicated mechanical machining methods and fastening means that they have made the production more expensive.

The method according to the invention is, in the first place, characterized in that an edge of the work-piece is placed underneath and in contact with the underside of the metal plate to serve as a die, while a punch is forced through said metal plate from the upper surface thereof to simultaneously out two spaced slots corresponding substantially to the Width and contour of the underlying edge of said work-piece and to displace or depress the metal plate adjacent said slots, after which another punch deforms the material of the metal plate located between said slots and also deforms or upsets the underlying edge of the work-piece which serves as the die, so that said deformed or upset edge of the workpiece is interlocked between the displaced or depressed portions of said plate and the deformed material between said slots.

Other characteristic features of the method according to the invention are treated in connection with two embodiments thereof more specifically described in the following specification.

The invention is bodiments in the accompanying drawings wherein, for purposes of illustration, Figures 1-4 show different phases of the production of one embodiment and Figures -11 show diiferent phases of the production in accordance with the other embodiment.

According to the invention metal plate l2 serves illustrated in two of its emas a die for the punch pressed down against the metal plate [3.

In Figure 2, the shape of the metal plate 13 is shown after the punch M has accomplished its the form of the punch.

Figure 4. shows a horizontal View of Figure 2 after the punch M has been taken away. From Figures 2 and 4 it is evident that the punch M, as indicated by the lines l5 and IS in Figure 4, cuts a metal strip it out of the metal plate I3, which metal strip is united at both ends with metal plate I3. Simultaneously with the cutting action just referred to, the punch l4 displaces or depresses from the metal plate l3, tWo tongues I9 and 2B. These tongues form an angle with each other as will be apparent from Figure 2. From the same figure it is further apparent that the free edges of tongues I9, 23 lie closely adjacent the work-piece l2 at opposite sides thereof. The free edges of the tongues I9, 20 do not make close contact with the opposite sides of work-piece !2, as there is, in reality, a little space between the free edges of these tongues and the sides of said work-piece, as best shown in Figure 2a.

Complete contact between said free edges and the sides of said work-piece may be obtained, however, by supportin the tongues I9, 20 during a the tongues, by deforming, are pressed into contact with the metal plate I2 as shown in Figure 2, This contact may, on the other hand, be obtained in connection with a second punching operation in which the punch l4 further bends down the tongues I9, 20 so that the down pressed tongues in Figure 4 form grips resembling thumb grips, the sides 2|, 22 and 23, 24 of which are united with metal plate 13. The reference numerals 2|, 22, 23, 24 may, however, also represent lines (Figure 4) along which the metal plate l2 has been cut by the punch l4. From Figure 2 it is evident that after this punching, a cavity 25 has been formed between the metal strip l8 and the upper surfaces of the tongues l9 and 20.

In Figure 3, showing a cross section of a fastening joint complete according to the embodiment deformed the metal strip l8 and the upper edge of metal plate l2. This second punch is not shown in the drawing. By supporting the tongues I9, 20 during this second punching operation by means of a support, the free edges of these tongues may, as has been mentioned above, during the M, when said punch is same punching operation, be brought into complete contact with metal plate l2. After this second punching operation, the, metal strip I8 is flattened as indicated by reference character lBa (Figure 3), and lies against and presses against the punched out edge 26 of metal plate i2, so. that edge 26 is held firmly and steadily between metal strip iBa and tongues l9, 2i).v Thisfastening method is simple, cheap and effective andis. possible to accomplish with simple means and with rapidity.

Figures 5, 6 and "I show a side view, a cross section and a horizontal view, respectively, of the original position of parts for the fastening of an edge of one or more U-shaped metal plates. 21. to the surface of a plane metal plate 28, which,,for, instance, consists of a part of a closed frame work. Figures 8 and 9 correspond toFigures 5 and 6 and show the appearance of

metal plates

21, and 28 after accomplishing thefirst punching operation on metalplate-28, with punch 29, each U-sha-pe-d metal plate 2? serving as a die during this initial punching operation. Punch 29 has thesame width and form asthe inner edge of the U-shaped metal plate 21. The form of punch 29, therefore, varies in accordance with the form of the work-piecewhich is to be fastened to the plate 28, In the example shown, the punch 29 has a cross-sectional form or configuration corresponding to the surface 30, 3|, 32, 33 in Fig. 7. The lo wer surface of punch 29 is arched according to Figure 9, and the side surfaces 35 and 35 of punch 29 form sharp edges (see Figure 8) with bottom surface 35- in order to out metal plate 23, While the

other side surfaces

31 and 38 of the punch 29 form rounded edges with the bottom surface 36 of;the punch in order not to cut metal plate 23 (See; Figure 9). By the pressing down of the punch-29 against metal plate 28, a metal strip 39 is cut and is pressed down out-of metal plate 28, which metal strip with its downwardly bent part liesagainst the inner sides of the legs of metal plate 2?, each end of said downwardly bent part being united with metal plate 28. In Figure '7, line (ML-3| and 32-33 represent cutting lines where metal plate 28 is cutthrough bypunch 29, while metal strip 39 is united with metal plate 28 along the places 3l--32 and wig-33. Each U- shaped metal plate 2! is, after this punching operation, partly held by metal plate 28. For,com plete fastening of the U-shaped metal plates to metal plate 28, still one or more punching operations performed with another punch, are required. These operations are evident from Figures 10 and ll, in which Figure 10 corresponds to Figure 8 after accomplishing these last punching operations, and Figure 11 is a cross-section of Figure 10 between two U-shaped metal plates 21 lying near each other,

If a plurality of U-shaped metal plates v2", arranged in a line after each other and at a distance fromeach other, are to be fastened to a common metal plate 28, this is effected by means of a punch with a form 36 shown in full lines in Figure 10, which punch is shown in side elevation in Figure 11. Thispunch 40 having an arched bottom surface, is punched downwardly against the remaining parts, designated 4! in Figure 8, of the metal plate 28, said parts being situated between the down pressed metal strips 39. By this down pressing, the parts M are bent to the form designated a l a in Figures 10 and 11, while simultaneously with such bending, the upperedgesof the u shaped metal plate. are e e m d so they are bent in over the metal strips 39. The

that,

last mentioned bendings are designated 42 in Figure 0. Parts Ma and 42 are bent only, or else they are both bent and stretched, depending upon the force with which the deformation is effected. By the method here described, the punch it at each operation thereof fastens to metal plate 28 one edge of each of two U-shaped metal plates2'l' lying, near each other, and as the punch 48 passes over all U-shaped metal plates, all of these are fastened at both sides. Punch M) is also utilizable for fastening the outermost legs of the outermost u-shaped metal plates, but in Figure 0 this is not shown. Instead, this figure indicateshow these outermost legs may be fastened, if desired, by means of a punch with a somewhat differings'hape (compare the impression 4H) of this punch in Figure 10) It is evident from what isdescribed that with this fastening method, the ends 62 of the U-shapedmetal plates are brought to a secure and locking engagement between parts Ma and 39 of metal'plate 2B in a simple and cheap manner.

If the object is only to fasten one U'-shaped metal platen to a metal plate 28, this may be eifected. by means. of a second punch simultaneously effecting the deformations Ma and 42 at both sides of one U-shapedmetal plate 21. A punch or deforming tool of this type is indicated in Figure 10, which punch includes a first punch member it and a second punch member Ma indicated in dash-dotted lines in said figure.

The invention here described is not restricted to the embodiments shown which are only to be consideredas examples because the idea ofthe invention may be realized also in other ways.

Having now descrbedmy invention, what I claim as new, and desire to secure by United States Letters Patent, is:

1. In the method of fastening a work-piece having spaced wall portions at one end edge thereof to a plane plate member disposed-perpendicular to the wall portions of the workpiece, the step which comprise utilizing the work-piece as a die and'severing and displacing from the plate in the direction of the work-piece an integral strip portion to engage endwise inwardly of the work-piece between the spaced wall portions thereof, and deforming simultaneously the portions, of'the plate laterally adjacent said strip and the underlying end'edge portions of the spaced walls of the work-piece to interlock said endedgeportions of the work-piece between the displaced strip and deformed portions of the plate.

2. Inv the method of fastening a work-piece having spaced wall portions at one end edge thereof to a plane plate member disposed perpendicular to the wall portions of the workpiecathe steps which comprise ut'lizing the 'work-pieceas a die, severing from the plate an integral strip'portion and simultaneously displacing the'samein the directionof the work-piece to engage endwise inwardlythereof between the spaced wall portions thereof, andthen deformingin the'directi'on of the work-piece the plate portions at opposite sides of the displaced stripto cause the underlying end edges of the spaced walls of the workpiece'to ,be turned inwardly thereofand engaged over theintermediate displaced strip portionof the plate so that the work-piece end is interlocked between the displaced. strip and deformed, edge portions of the plate.

3. The methodof. fastening a workqpiece at an edge thereof to. aplane plate ..member. disposed substantially perpendicular to said work-piece,

which comprise the steps of placing an edge 01' the work-piece into contact with a surface of the plate member with the plate member extending beyond at least one end of said edge, utilizing said edge as a supporting die, severing from the plate member an integral strip corresponding substantially to the width and contour of said edge by forming spaced cuts in the plate member adjacent opposite sides of said edge and within the area of said plate member and displacing simultaneously with said severing and in the direction of said work-piece integral tongue portions disposed at opposite sides of said work-piece, deforming simultaneously the said integral strip and upsetting said edge, and deforming said tongue portions toward said workpiece to bring the free edges thereof into contacting relation with opposite sides of said work-piece inwardly thereof from said edge and beneath said upset edge, whereby to interlock said upset edge between said deformed integral strip and said tongue portions of said plate member.

GEORG KARL J OHAN BROBERG.

Number Number Name Date Schoen Jan. 30, 1894 Stimpson Nov. 16, 1909 Furguson Nov. 29, 1910 Wenn June 8, 1926 Williams Sept. 2, 1941 Eckel Sept. 16, 1947 FOREIGN PATENTS Country Date Germany Oct. 15, 1930