US2909817A - Die stamp - Google Patents

Description

Oct. 27, 1959 c. PRIESMEYER DIE STAMP Filed March 27, 1956 INVENTOR: CHARLES PRIESMEYER FIGZ ATT'Y 2,909,817 Patented Oct. 27, 1959 DIE STAMP Charles Priesmeyer, Park Ridge, 111., assignor to Meyer- Wenthe, Inc., Chicago, 111., a corporation of Illinois Application March 27, 1956, Serial No. 574,238

5 Claims. (Cl. 22-67) This invention relates to die stamps and more particularly to a device for making male reverse or counter dies from matrix dies as used in corporate, notary and other seals.

It is often desirable to obtain male reverse or counter dies of impression seals in order to form raised imprints on documents. However, there has been heretofore no standard or inexpensive equipment for such a procedure. The process has required cumbersome machinery and the expenditure of considerable effort as well as a waste of materials.

It is accordingly an object of the present invention to provide a die stamp for making alloy metal male reverse or counter dies from the brass matrix dies which are used for corporate and notary seals.

Another object of the invention is to provide a device of the type indicated which is portable and can be easily used in various locations and service centers without the need for special skills on the part of the operator.

Another object of the invention is to provide a die stamp of the type indicated which is extremely compact and simple in construction adapted to protect the operator from molten metal which may be splashed in the process of making the male reverse or counter die.

Another object of the invention is to provide a die stamp from which the splashed molten metal may be readily removed. 7

Another object is to provide means for centering the brass matrix die in relation to the metal to be stamped so that the matrix die will be guided in perpendicular relationship to the molten metal to form a perfectly even, uniformly level andprecisely matched counter die.

Another object is to provide means for quickly supporting and guiding the matrix die for use with but slight effort on the part of the operator.

Other objects and advantages will become apparent as the description proceeds in accordance with the drawings in which:

Fig. 1 is a vertical sectional view of the die stamp according to the invention taken through the line 11 of Fig. 2; and I Fig. 2 is a top plan view of the die stamp.

Referring now to Fig. 1 the die stamp 10 comprises a circular metal base 12 of a suitably heat resistant material, a dome shaped cover 14 of similar material having a central guide boss 16 in the top thereof formed integrally therewith to support a plunger 18 slidably in guided relationship. The plunger is urged to its upper limit of movement by a spring 54. p 7 v The base 12 has a concentric, relatively thick'circular portion 20 formed therein as defined by sector-shaped recessed portions 22 in the base. A concentric circular shallow basin or cup 24, preferably with vertical side walls 26, is provided in the top of the base 12 for receiving therein the molten alloy metal from which the male reverse or counter die is to be formed. The annular outer depending flange 28 and the relatively thick central portion 20 thus ensure a firmv foundation :for the die stamp without the need for uniform solidity which would add to the weight and expense of the base.

As best seen in Fig. 2, a pair of laterally extending spaced apart trunions or journal posts 30 and 32 are formed preferably integrally with the base for receiving a hinged flange 34 formed integrally with the cover 14 therebetween and a hinge pin 36 is inserted through the journal posts and hinge flange so that the cover 14 may 4 be pivoted into overlying relationship with the base as shown in solid line of Fig. 1 or moved outwardly to expose the base as shown in broken lines 37 in Fig. 1.

The hinge flange is recessed at 38 so that the outer edge 40 of the base 12 will not come into engagement therewith when the cover is in the closed position or moved toward the closed position. Between the posts 30 and 32, the flange is provided with a protuberance or shoulder stop 42 formed integrally therewith which is adapted to engage with a complementary construction or stop 44 formed integrally with the base. The two stops engage when the cover is in the elevated position as shown in broken lines in Fig. 1. Accordingly, the cover, when opened, will be prevented from pivoting backwardly and downwardly far enough to disturb the levelness of the base 12 and spill molten material contained therein, yet the cover is in a position where it can be closed immediately when the metal is at the right temperature ready for the die stamping operation to be made.

The guide boss 16 projects vertically and concentrically above the dome-shaped cover 14 and perpendicularly to the base 12 when the cover is in the closed position of Fig. 1. This construction thus holds the plunger 18 so that it is guided downwardly in perfect perpendicular alignment with the shallow basin'24 as will be hereinafter described. To assure this throughout long .years of use, the boss is recessed centrally at 46 to receive therein a guide sleeve 48 having an annular shoulder 50 seating at the top 52 of the boss so that the plunger shaft 18 may be guided along an even greater portion of its length to stabilize the vertical alignment to the basin as described. The 'guide'sleeve also serves to position the helical spring 54 in concentric relation with the shaft 18 as supported at one end on the boss 16 at the other end against a plunger handle 56.' The handle 56 may be secured to the shaft 18 by any suitable means such as the threaded bolt 58 on the upper end of the shaft 18. Thus the entire plunger will be urged upwardly by the spring 54.

The lower end of the plunger carries an element 59 which receives a bolt 60 or other suitable means embedded in the base 64 of a suction cup 62 made of resilient material. The base 64 of the suction cup is relatively wider in diameter than the element 59 to provide a shoulder 61 that supports the lower end of a helical spring 66 thereagainst. The other end of the spring 66 is twisted onto the lower end of the plunger 18 as at 69 and serves as a stop for the upward movement of the plunger as well as assisting downward movement of the plunger, the spring end abutting against an upper wall 63 within the boss 16. The spring-54 is a light one so that the plunger is provided with a counter biasing means which will permit the plunger to be moved downwardly with a quick blow with relatively little force. The balance afforded by springs 54 and 66 also ensures that the plunger will not be impressed into basin 24 with excessive force.

In the operation of the device a brass die for a notary seal or the like 70 is affixed to the plunger by pressing it against the suction cup 62' and the cover is raised to the position as shown in dot-and-dash in Fig. 1. Thereupon a suitable amount of molten metal for forming the reverse die is poured into the basin 24 and the cover is repositioned over the base as shown in solid line. Thereupon the plunger is given a quick blow which moves the shaft through the boss 16 in true normal relationship to the base and snaps the die stamp against the surface of the metal 72. The metal under this blow endeavors to flow from under the seal at a high rate, but being stopped and driven back by the wall 26 opposes any substantial escape of metal before a perfect image and a counter die of uniform thickness is accomplished.

Any metal which may be splashed out of the basin is thus prevented from flying into the face of the operator or onto his clothing by the cover 14. After the operation is completed and the metal has been hardened so that the counter die formed in the basin can be removed, the metal on the dome 14 can be taken oif by use of a chisel or by pounding the top of the cover, the curvature of the dome aiding in this because it permits a space to be formed between the dome and the molten metal adhering thereto upon contraction of the metal.

In assembling the device the plunger 13 is inserted through the relatively narrow sleeve 48 which is in turn inserted within boss 16. Thcreupon the lower extremity of the shaft receives the upper end of the spring 66 thereon as at 69 as already mentioned. The lower end of the spring 66 is secured to the upper portion of the suction cup 62 by means preferably of the element 59 and the bolt 60. Thus the suction cup 62 is received in supported relationship to the shaft within the cover 14. The cover 14 is then pivotally secured to the base 12 by inserting pin 36 in posts 30 and 32 and swaging the ends of the pin.

Having thus described the invention and certain embodiments thereof it will be readily apparent to those skilled in the art how the objects mentioned are accomplished and how various and further modifications and changes may be made without departing from the spirit of the invention, the scope of which is commensurate with the appended claims.

I claim:

1. In a die stamp structure of the character described, a fiat base having a relatively small centrally disposed recess therein for receiving a molten metal, a convex dome-shaped cover hingedly secured to said base for movement between an enclosing position overlying the base and an open position along an edge of the base to provide access to said recess, a pair of mating stops provided respectively by said base and cover for limiting the movement of the cover into the open position thereof to a generally vertical orientation relative to the base, said convex cover being equipped centrally with an outwardly extending boss having a bearing-equipped passage therethrough vertically aligned with said recess when said cover is in the enclosing position thereof, a handleequipped plunger axially reciprocable in said bearingequipped passage, a coil spring surrounding a portion of said plunger and biasing the same outwardly of said cover, a helical spring secured to said plunger at the inner end thereof and normally abutting an inner surface portion of said cover to constrain outward movement of the plunger under the biasing force of said coil spring, and a suction cup carried by said helical spring to support a die thereon for impressing the same into a body of metal contained within said recess when said cover is in the enclosing position thereof and said plunger is pressed downwardly.

2. In a die stamp structure of the character described, a flat base having a relatively small centrally disposed recess therein for receiving a molten metal, a convex dome-shaped cover hingedly secured to said base for movement between an enclosing position overlying the base and an open position along an edge of the base to provide access to said recess, said convex cover being equipped centrally with an outwardly extending boss hav ing a bearing-equipped passage therethrough vertically aligned with said recess when said cover is in the enclosing position thereof, a handle-equipped plunger axially reciprocable in said bearing-equipped passage, a coil spring surrounding a portion of said plunger and biasing the same outwardly of said cover, a helical spring secured to said plunger at the inner end thereof and normally abutting an inner surface portion of said cover to constrain outward movement of the plunger under the biasing force of said coil spring, and a suction cup carried by said helical spring to support a die thereon for impressing the same into a body of metal contained within said recess when said cover is in the enclosing position thereof and said plunger is pressed downwardly.

3. In a die stamp structure of the character described, a base having a relatively small centrally disposed recess therein having a fiat bottom for receiving a molten metal, a removable cover for said base to enclose the base and to provide access to said recess, said cover being equipped centrally with a boss having a bearing-equipped passage therethrough verticaly aligned with said recess when said cover is in said enclosing position, a handle-equipped plunger axially reciprocable in said bearing-equipped passage, resilient means for biasing the plunger outwardly with respect to said cover, a helical spring secured to said plunger at the iner end thereof, and means carried solely by said helical spring to support removably a die above said recess, said helical spring and said means impressing the die into a body of metal contained within said recess without excessive force when said cover is in the enclosing position thereof and said plunger is struck downwardly.

4. In a die stamp structure of the character described, a base provided centrally with means for receiving and containing a molten metal, a convex cover of generally dome-shaped configuration movable between an open position affording access to said means and a closed position overlying said means, a plunger reciprocable through said cover in vertical alignment with said means when said cover is in the closed position, and coil spring carried by the inner end of said plunger for supporting a die including an element releasably engaging the die, said spring constituting the sole support between said plunger and said die for relative cushioning movement of said die for impressing the same into a body of molten metal contained within the first mentioned means when said cover is in the closed position thereof and said plunger is struck downwardly.

5. The combination recited in claim 4 in which said element releasably engaging the die comprises a suction cup of resilient material.

References Cited in the file of this patent UNITED STATES PATENTS 10,438 Adams Ian. 24, 1854 340,171 Trimmer Apr. 20, 1866 1,358,648 Nichols Nov. 9, 1920 1,385,749 Mueller July 26, 1921 1,453,390 Hellberg May 1, 1923 1,611,840 Ralston Dec. 21, 1926 1,989,287 Parr Ian. 29, 1935 2,330,274 Fiske Sept. 28, 1943 FOREIGN PATENTS 89,997 Austria Oct. 10, 1922 420,792 Germany Nov. 2, 1925

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