US3007229A - Apparatus for forming sockets for drop rings - Google Patents

Description

G. A. LYON 3,007,229

3 Sheets-Sheet 1 APPARATUS FOR FORMING SOCKETS FOR DROP RINGS Nov. 7, 1961 Filed June 27, 1955 IZFE 27.227 I" h George A/berf Lyazz 2: L 7 M W, [r 75 Nov. 7, 1961 G. A. LYON 3,007,229

APPARATUS FOR FORMING SOCKETS FOR DROP RINGS Filed June 27, 1955 Sheets-Sheet 2 F .4 57.5 5, 5

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T INGS Era 11 U 2'" Geozye A/bez" 012 United States Patent 3,007,229 APPARATUS FOR FORMING SOCKETS FOR DROP RINGS George Albert Lyon, 13881 W. Chicago, Blvd., Detroit 28, Mich. Filed June 27, 1955, Ser. No. 518,323 2 Claims. (Cl. 29-1.21)

This invention relates to a method and an apparatus for forming hanger sockets.

More specifically this invention relates to a method and an apparatus for forming moisture proof bomb hanger sockets in the wall of the bomb so as to provide means by which the bomb may be suspended from the underside of the wing of an airplane or the like.

At the present time there is considerable attention being given by some manufacturers in developing a new type of streamlined low drag bomb. This particular bomb is of the 500-2000 lb. type. Due to the faster speeds now being developed by presently existing airplanes and the higher altitudes now attainable by them, the conventional bomb construction must be streamlined so as to permit precision bombing under these more exacting conditions.

Accordingly it is an object of this invention to provide a novel method and an apparatus so as to facilitate the manufacture of streamlined low drag type of bombs.

Another object of this invention is to providea new and improved method and apparatus for forming bomb hanger sockets in the wall of a bomb casing which may be cheaply and efliciently carried out'so as to lend itself to large scale production techniques.

Still another object of this invention is to provide a novel method and apparatus by which the large bombs may be provided with hanger sockets through the use of presses capable of developing the required punching power.

A further object of this invention is to provide a novel method and apparatus which is capable of simply converting a rivet blank to a rivet while at the same time attaching the rivet to the wall of a bomb.

A still further object of this invention is to provide a novel method and apparatus which is capable of forming a plurality of bomb hanger sockets in the wall of the bomb in the same operation.

Yet another object of this invention is to provide a novel method and apparatus in which bomb hanger stud sockets may be simply riveted to the wall of a bomb thereby eliminating other more cumbersome techniques now employed by manufacturers.

Another and still further object of this invention is to provide a novel method and apparatus which is capable of producing a moisture proof stud socket and bomb wall connection.

In accordance with the general features of this invention there is provided in a method of forming bomb hanger studs on the wall of a bomb casing, the steps of punching the wall of the bomb to form an apertured wall portion, inserting a die member within the casing, inserting a rivet slug through the aperture resting same on the die member, and compressing the slug to mushroom and firmly secure same on the radially inner and outer sides of the casing wall to form a bomb hanger' stud.

Other features relate to the provision of one form of apparatus adapted to carry out my method and which includes wedgingly cooperable die or anvil members insertable into the interior of the bomb casing for use in the riveting operation.

Other objects and features of this invention will more fully appear from the following detailed description taken ice in connection with the accompanying drawings which illustrate a single embodiment thereof and in which:

FIGURE 1 is a longitudinal cross-sectional view with parts in elevation showing a bomb casing having apparatus therein for effecting my novel invention;

FIGURE 2 is an enlarged cross-sectional view taken on the line II-II of FIGURE 1;

FIGURE 3 is an enlarged fragmentary cross-sectional view similar to FIGURE 2 but showing an early step in the carrying out of'my novel method and a portion of the press for effecting same;

FIGURE 4 is an enlarged fragmentary cross-sectional view taken on the line IV-IV of FIGURE 3 showing in greater detail an early step in my novel method and novel apparatus for carrying out same and with the apparatus in a press;

FIGURE 5 is an enlarged fragmentary cross-sectional view similar to FIGURE 3 but showing a later step in my novel method and other apparatus for carrying out same;

FIGURE 6 is an enlarged fragmentary cross-sectional view similar to FIGURE 5 showing a still later step in my novel method and the novel apparatus for effecting same; J

FIGURE 7 is an enlarged fragmentary cross-sectional view similar to FIGURE 6 showing a still later step in my novel method and the novel apparatus for carrying out same; and

FIGURE 8 is a plan view of a bomb casing showing the stud sockets in a completed state.

As shown on the drawings:

The reference character 10 (FIGURE 8) indicates generally one of a series of bomb hanger stud sockets which are riveted to the cylindrical wall 11 of the bomb casing 12. It will be appreciated that after the bomb hanger stud sockets have been. formed in the wall of the bomb casing 12 that the other component parts of a completed bomb may be then assembled with the casing 12 including the tail assembly, the power charge and the war head (not shown).

In order to aid in the understanding of my invention I shall now proceed in detail to describe same following. generally the steps carried out in my novel method along with a description of my novel apparatus as effecting each step.

As seen in FIGURE 1, a pair of slidably adjustable interlocking complementally beveled-type die or anvil members 13 and 14 are disposed in the casing and have opposite ends projecting through the longitudinally opposed openings 15 and 16 of the bomb casing 12. They may be inserted in the casing 12 through end opening 16 and are thereafter adjustably assembled within the confines of the casing wall by means of a tongue and socket connection indicated generally at 17 (FIGURES l and 2) connecting the opposed inclined sliding surfaces 18 and 19 of the die members 13 and 14. The members 13 and 14- not only serve as a lower die member in my method but also can support the casing 12.

Each of the wedging die members 13 and 14 have a wedging arcuately curved surface 20 and 21 (FIGURE 2) which engages in an opposed relation against the radially inner surface 22 of the cylindrical wall 11.

The socket connection 17 is utilized to minimize radial and axial slippage of the die members 13 and 14 relative to one another and in addition, serves to bring the respective .arcuately curved surfaces 20 and 21 of the die members 13 and 14 into firm nested engagement with the inner surface 22 of the bomb wall 11 so as to minimize any undesired distortion of the bomb wall as a consequence of working the cylindrical wall 11 as hereinafter will be more evident.

Provided on the upper die member 13 are two dished Patented Nov. 7, 1961 shaped slots or female dies 23 and 24. The larger female die 23 is suitably capable of assisting in the formation of a plurality of sockets 10, three as shown. The smaller female die 24 is adapted to assist in the forming of a single socket 10. Due to the closeness of the spacing of the sockets required under international convention, and for reasons of manufacturing expediency, I have found it convenient to utilize a larger type female die 23 which is capable of assisting in the formation of three sockets 10 at the same time. It will be appreciated that all of the sockets could be separately formed by the use of a plurality of dies similar to female die 24 or all of the sockets 10 could be formed together by the use of a die similar to female die 23.

The die members are adjustably inserted in overlapped and wedged relation within the bomb casing 12 until the aforementioned dies 23 and 24 are positioned in a predetermined location relative to the cylindrical wall 11. This predetermined location preferably constitutes the center of mass area of the bomb so that the bomb may be suspended from the underside of a plane in such a man ner that there is a uniform distribution of mass relative to the hanger elements (not shown).

In the illustrated die arrangement, three vertical or transverse openings or bores 25 extend completely through the die member 13, one for each socket to be formed. The female die 24 has a single bore 25 since it is to assist in the formation of only one socket It The next step of my novel method after the assembly of the dies 13 and 14 within the bomb casing 12 is the insertion of the bomb or casing 12 into a suitable press, a part of which is shown in FIGURES 3 and 4- in the form of a hold-down die or a countersinking and punching holddown member 26. It will be appreciated that the die members 13 and 14 may be assembled within the bomb casing 12 before or after being placed in the press as desired; and that the press may be any conventional double toggle or double acting hydraulic press.

After the bomb casing 12 has been positioned in the press,rthe hold-down die 26 having male die members or projections or countersinking tools 27 and 28 are compressed against the outer surface of the cylindrical wall 11 at 29 and 30 and the wall thereof is dished or upset radially inwardly into the female dies 23 and 24 carried by the die member 13 to form two inset dished pockets 31 and 32, respectively, in the wall 11.

It will be noted that except for the male die members 27 and 28 the outer arcuate surface of the holddown external member 26 is adapted to engage nestingly with the cylindrical outer surface of the wall 11 to prevent any undesired deformation thereof.

Thereafter, press rams or punching tools 33 of predetermined variable diameters as desired are each contemporaneously urged radially inwardly through vertical bores 34 in die member 26 and inset pockets 31 and 32 in the bomb wall 11 thereby punching out suitably four openings or slots 35 from the wall 11. Since the bores 25 and 34 (FIGURES 1 and 3) are in vertical alignment each of the punched out slugs S is urged into the chutes 25 and may be readily removed as the die member 13 is withdrawn fro the interior of the casing 12 after the rams 33 are retracted. In other words, the slugs S drop out of the chutes after the die members 13 and 14 are disengaged. It is in this manner that the slugs are precluded from jamming and causing ditficulty in their removal.

In the next step of my invention, structurally different die and hold-down members 13a and 26a, respectively, are utilized as shown in FIGURES S, 6 and 7. The member 13a comprises a riveting and socket forming beveled die member and the member 26a comprises a riveting and socket forming holdd'own member. The die member 13a is adjustably mountable on the die member 14 in place of member 13 but in the same manner as in the case of die member 13.

The principal difference in the construction between the die member 13 and the die member 13a is that in each case where bores 25 were formerly employed in the die member 13, sockets 36 having radially projecting outwardly inclined or tapered walls 37 are now utilized in the die member 13a.

With respect to the hold-down member 26a vertical bores 38 of reduced diameter are now employed. These bores 38 are not only of a smaller diameter than that of the bores 34 but are also adapted to have projecting therethrough rivet forming rams 39 (FIGURE 5). Another feature of the hold-down member 2611 is that it is arcuate in configuration so as to be capable of snugly nesting with the outer cylindrical surface 40 of the wall 11 and thereby prevent any undesired deformation in the rivet forming operation (FIGURE 5 Since the formation of rivets in the respective sockets 36 is substantially the same in each case, the rivet forming operation has only been illustrated in connection with the inset dished pocket 32 (FIGURES 5-7).

The next step of my novel method after the removal of die member 13 and the insertion and adjustment of die member 13a along with the substitution of hold-down member 26a for member 26, is the insertion of one end 41 of a preferably preheated previously annealed rivet blank or slug 42 through the slot 35 in the inset dished pocket 32 with the end 41 resting in the socket 36 of the die member 13a. The other end 43 of the rivet blank 42 when the end 41 is in bottomed relationship with the socket 36 projects radially outwardly beyond the confines of the cylindrical wall 11 (FIGURE 5).

A solder ring 44, preferably of a silver composition, is then slipped over the end 43 of the rivet blank 42 and bottomed on the inset annular shoulder 45 of the inset dished shaped pocket 32.

The hold-down member 260 which is carried by the press has portions of it comprising riveting tools which are then brought into contact with the rivet blank 42. It will be noted that the radially innermost concave end of the ram 39 lies in the same plane as the lowermost concave surface 46 of the hold-down member 26a so that the ram is utilized in the forming of the rivet blank 42 into a rivet 42a (FIGURE 7). The ram 33 was also usable in this same manner in aiding in the formation of the dished inset pockets 31 and 32.

The press is first actuated with the hold-down member 26a urged downwardly against the blanks 42 and the die members and 14 to compress and mold the rivet blank 42 into an intermediately formed rivet 42b (FIGURE 6).

It will be noted that the head portion 47 of the rivet 42b is mushroomed out in the inset pocket 32 with the shank 48 conforming to the dimension of the hole or slot 35 and collapsed or mushroomed radially outwardly under the wall of inset pocket 32 beyond hole 35. Thus, the rivet blank head 47 is interlocked with both sides or surfaces of inset 32 radially beyond hole 35 and also the solder ring 44 is flattened tightly into position about the rivet 42 on inset 32.

After the innermost surface 46 of the hold-down member 26a is brought into nesting engagement with the outermost surface of the cylindrical wall 11, ram or socket forming tool 39 is then forcibly urged against and into the rivet 42b and a socket 50 is thereby formed in the rivet. As the socket 50 is formed, the metal of the rivet 42b is further deformed from the position shown in FIGURE 6 to that of FIGURE 7 wherein it is forced into snug contact with the inner surface of socket 36 and into tight contact with the under surface of inset 32. It will be noted that the inset dished pocket 32 includes radially, inner and outer upset surfaces 51 and 52 which are both utilized as dies and steps in the formation of the completed stud socket 10.

As shown in FIGURE 7, the exterior surface of the rivet head 47 is concavely cuiyed in the curved cylindrical plane of the outer surface of casing 11 so as not to detract from the streamlining of same.

The casing 12 is then removed from the press and the die members 13a and 14 are disengaged and removed from the interior of the bomb casing 12.

Thereafter, the casing may be stress relieved with the result that the flattened solder ring 44 is melted and any crevices or unsealed openings between the rivet or stud and the bomb wall are thereby filled.

It is in this manner that moistureproof stud sockets may be provided in the wall of a bomb casing so that a dry powder charge may be preserved in wet weather and the like. Also, the smooth lines of the bomb casing will remain substantially unaltered thereby meeting the need for streamlined bombs.

A further advantageous result which arises in the practice of the instant method and the apparatus used therefor, is that a plurality of stud sockets may be contemporaneously formed and secured to the streamlined bomb thus permitting of more rapid large scale production.

It will be understood that modifications and variations may be effected without departing from the novel concepts of the present invention.

I claim as my invention:

1. An expansible anvil for positioning and expanding within a bomb casing to rigidly back up the same during concurrent countersinking and punching operations comprising: a lower member having an upper inclined portion which extends from one end of said member, said inclined portion comprised of two upper flat portions which if extended would be mutually coplanar, said flat portions being spaced each from the other and separated therefrom by an integral key of constant cross sectional area which extends up and down said inclined portion from one end thereof to the other, a lower portion of said lower member beneath said inclined portion thereof being cylindrical so as to mate the cylindrical inner surface of said bomb casing; an upper member having a lower inclined portion which extends from one end of said upper member, said lower inclined portion being comprised of two lower flat portions which if extended would be mutually coplanar, said lower fiat portions be ing spaced each from the other and separated therefrom by a slot of constant cross sectional area which extends up and down said lower inclined portion from one end thereof to the other, said slot mating said key to guide the same and permit said two upper flat portions to abut against said two lower fiat portions, an upper portion of said upper member above said lower inclined portion thereof being cylindrical so as to mate said cylindrical inner surface of said bomb casing, said upper portion of said upper member having the desired countersink cavities and punch slug accommodating cavities; said upper member having an extension on the end opposite said lower inclined portion, said extension being adapted to protrude through the nose opening of said bomb casing; said lower member having an extension on the end opposite said upper inclined portion, the latter extension being adapted to protrude through the base opening of said bomb casing; whereby, incident to anvil assembly, first said upper member is admitted through said base opening and then said lower member is so admitted, the members mating and wedging together to form said anvil in said bomb casing with the aforesaid extensions protruding therefrom.

2. An expansible anvil as in claim 1 wherein said concurrent operations are rivet flattening and hole punching in the rivets and wherein said punch slug cavities are replaced by frusto-conical rivet holding cavities with the smaller ends thereof at the bottoms and the larger ends of said rivet holding cavities being larger than the holes previously punched through said bomb casing, the latter holes being readily alignable with said frusto-conical cavities so rivets may be installed on said bomb casing while using said expansible anvil as a rigid backing.

References Qited in the file of this patent UNITED STATES PATENTS 110,695 Tonham Jan. 3, 1871 452,482 Robischung May 19, 1891 747,583 Boyle et al. Dec. 22, 1903 916,991 Brinckmann Apr. 6, 1909 1,190,803 Rosenfeld July 11, 1916 1,207,948 Long Dec. 12, 1916 1,264,854 Possons Apr. 30, 1918 1,305,974 Pearne June 3, 1919 1,355,434 Sultemeyer Oct. 12, 1920 1,442,481 Lassiter et al. Jan. 16, 1923 1,516,762 Decker Nov. 25, 1924 1,625,854 Holt Apr. 26, 1927 1,678,451 Taylor July 24, 1928 1,884,914 Taylor Oct. 25, 1932 1,962,543 Wilson June 12, 1934 2,216,403 Oeckl Oct. 1, 1940 2,268,787 Wales Jan. 6, 1942 2,288,378 Veit June 30, 1942 2,356,526 Mayer Aug. 22, 1944 2,367,121 Hill Jan. 9, 1945 2,695,062 Taylor Nov. 24, 1954 FOREIGN PATENTS 11,969 Great Britain AD. 1847 749,761 Germany Dec. 4, 1944 800,271 Germany Oct. 25, 1950

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