US2864427A - Dimpling apparatus having a resiliently supported ram - Google Patents

Description

Dec. 16, 1958 w, c, sT M 2,864,427

DIMPLING APPARATUS HAVING A RESILIENTLY SUPPORTED RAM Filed June 4, 1954 F1/ rr 4 h .4

23 IN V EN TOR.

WILLIAM C. STRATMAN FIG. 4

ATTORNFY William C. Stratman, Los Angeles, Calif., assignor to North American Aviation, Inc.

Application June 4, 1954, Serial No. 434,507 6 Claims. (Cl. 1553-21) This invention pertains to coin dimpling rams of the type illustrated in Patent 2,441,790 issued May 18, 1948 to F. B. Bolte, et al.

In coin dimpling, as carried out according to the teaching of that patent, the ram portion of the die was found to break with considerable frequency. This resulted in considerable expense and delays in replacing the parts in the equipment.

The arrangement in that patent was also found not to operate with uniformity of results because of inability to properly adjust the yielding support of the rubber supporting the ram member.

Many attempts have been made over a period of years to avoid this breakage and'to provide proper support to the ram member.

The material of the ram must be hard to withstand the dimpling action and the walls of the ram member arenecessarily thin because of the space limitations. In the past the ram member has consisted of an upper portion adapted to receive the pilot of the punch member and a lower guiding or base portion. These have been integral in the past and any misalignment of the ram member in the die body resulted in stress being set up in the ram causing it to fail.

It is, therefore, an object of this invention to provide a ram member that will withstand the dimpling forces with a minimum of breakage.

It is also an object of this invention to provide a ram that is interchangeable in diiferent styles of die bodies.

It is a further object of this invention to provide a ram that is separable so that the portion which is sub jected to the greatest stress and accordingly more likely to break will be readily replaceable.

It is yet a further object of this invention to provide an adjusting arrangement with respect to the resilient supporting pad for properly supporting the ram during the coin dimpling operation and also returning the ram to normal position upon completion of the coin dimpling operation.

It is still a further object of this invention to provide pins for readily fastening the parts of the assembly together so that they may be easily disassembled and re assembled.

Other objects of this invention will become apparent from the following description taken in connection with the accompanying drawings.

Fig. 1 is an elevational view partly in section showing the invention.

Fig. 2 is a perspective view of the ram member.

Fig. 3 is a perspective view of the base member.

Fig. 4 is a section of the shank member disassembled from the die body.

Fig. 5 is a perspective of material after it is dimpled.

Referring to Fig. 1, a punch member 1 having a pilot element 2 is adapted to cooperate with ram member 3 of die body 4 to coin dimple material 28. Ram 3 is slid ably received in die body 4 at 5 and is provided with an enlarged portion 6 received in recess 7 of body 4. P01- States Pater tion 6 is adapted to engage the upper portion 8 of recess 7 to limit the upward movement of member 3. Memher 3 operatively engages base member 9 slidably received in recess 10 of member 4. Base member 9 in turn rests upon a pad 11 of rubber provided with a cylindrical opening 12. Rubber pad-11 in turn is supported upon shank 13 adapted to be fastened to the die body by pins 14 and 15 slidably received in recesses 16 and 17. In their extended positions pins 14 and 15 are received respectively in recesses 18 and 19 contained in die body 4. A screw threaded member 20 is adapted to be adjustably received in shank 13 by engagement with corresponding threads in the shank member. Member 20 is provided with a conical portion 23 for engaging pins 14 and 15 to move them into engagement with recesses 18 and 19 but also serves to vary the resistance of member 11. During the coin dimpling operation member 11 serves to support the underportion of material 28 to avoid damage thereto during the dimpling operation. By adjustment of screw member 20 with respect to cylindrical opening 12 in member 11, the resistance of member 11 may be varied to provide a proper support for material 28 during the dimpling operation. Base member 9 is provided with recesses 21 for collecting detritus particles which are rubbed off or broken away from material 28 during the coin dimpling operation. Collection of this material on: and around the ram member in the past has resulted in causing the ram member to be improperly placed with the result that it does not function to the best advantage and the coin dimpling is not the best obtainable. These particles pass through opening 22 of ram member 3.

In the operation of the device, punch 1 is moved downwardly under a force of several hundred pounds in a manner well known in the art. Pilot member 2 passes through opening 29 in material 28 and is received in recess 22 of ram member 3 and guides the punch member into proper engagement with material 28. This material is engaged by portion 24 of the punch element against the upper portion 25 of ram member 3 which yields on account of compression of rubber member 11 and the under surface of portion 25 is adapted to project above member 4 as shown in Fig. 1. The yielding action permits deformation of material 28 in the area where the coin. place until the material to be coin dimpled, is firmly engaged by surface 24 and surface 26 of die:

dimpling takes member 4. During this operation ram member 3 slides vertically without any lateral stress thereby reducing: breakage of member 3 to a minimum. The force from ram 3 is transmitted to member 9 which in turn trans-- mits it to rubber member 11. Granular material, chips or the like resulting from the coin dimpling operation pass through opening 22 and are received in recess 21 of member 9. These chips or material may be removed from time to time as found necessary.

In the event it is desired to provide greater or less support to the underside of material 28 during the coin dimpling operation, it is only necessary to adjust screw 20 within the shank 13 by engaging recess 27 thereof with the screwdriver to move it relatively to the cylindrical opening 12 of rubber member 11 thereby increasing or decreasing the resistance to yield of that member.

If it is desired to disassemble the members, it is only necessary to back olf screw 20 to a point where pins 14 and 15 may be driven out of engagement with recesses 18 and 19 into the position shown in Fig. 4 and then disengage shank 13 from the die body 4. Members 3, 9 and 11 may then be replaced as desired and chips removed from recess 21.

Assembly of the bers 3, 9 and 11 13 with openings screw member 20 parts is obtained by placing ram memin position then placing shank member 16, 18, 17 and 19 aligned and adjusted until conical portion 23 forces pins 14 and 15 into engagement with openings 18 and 19 of member 4.

Having thus described my invention, what I claim and desire to secure by Letters Patent is: I

1. A die member for use with apparatus for. forming dimples around an opening comprising a hollow member having a die face at one end and a closure at the other end, a ram and a resilient supporting element for said ram received within said die member, pins carried by said closure for lateral movement with respect thereto, openings in said die member for receiving said pins, and means operatively engaging said closure for moving pins laterally into said openings.

2. Apparatus for forming dimples around an opening in a sheet of coinable material comprising punch means having a frusto-conical portion and a pilot element, die means having an opening provided with a frusto-conical portion corresponding with the frusto-conical portion of said punch means, ram means slidably received in said opening and provided with an opening for receiving said pilot element, means resiliently urging the upper surface of said ram means above the frusto-con'ical surface of said die means, said resilient means comprising a block of resilient material having an opening therein, a base element separate from said rarn element for transmitting coining forces from said ram element to said resilient means whereby to coin the material between said frustoconical portions, and means adjustably received in said resilient material opening for varying the resistance of the resilient means.

3. A device as recited in claim 2 in which said base element is of larger diameter than said ram element.

4. Apparatus for forming dimples around an opening in a sheet of coinable material comprising punch means having a frusto-conical portion and a pilot element, die means having an opening provided with a frusto-conical portion corresponding with the frusto-conical portion of said punch means, ram means slidably received in said opening and provided with an opening for receiving said pilot element, means resiliently urging the upper surface of said ram means above the frusto-conical surface of said die means, and a base element separate from said ram element for transmitting coining forces from said ram element to said resilient means whereby to coin the material between said frusto-conical portions, said base element being provided with recesses for receiving detritus material resulting from the coin dimpling operation.

5. A device as recited in claim 4 and further including means for changing the resistance of said resilient element.

6. A die member for use with apparatus for forming dimples around an opening comprising a hollow member having a die face at one end and a closure at the other end, a ram and a resilient supporting element for said ram received within said die member, pin means carried by said closure for latching engagement with said die member, openings in said die member for receiving said pin means, and means for operatively engaging said closure and movable relative thereto for moving said pin's into latching engagement with said die member openings, said pin moving means being progressively movable into operative contact with and thereby regulating the deformation of said resilient supporting element whereby the amount of deflection of the same may be controlled.

References Cited in the file of this patent UNITED STATES PATENTS 2,438,837 Archer et al Mar. 30, 1948 2,441,790 Bolte et al May 18, 1948 FOREIGN PATENTS 155,204 Great Britain Jan. 12, 1922

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