US2073154A

US2073154A - Metal stamping device

Info

Publication number: US2073154A
Application number: US20518A
Authority: US
Inventors: Hoffmann Gustav
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-05-09
Filing date: 1935-05-09
Publication date: 1937-03-09
Anticipated expiration: 1954-03-09

Description

March 9, 1937. G. HOFFMANN 2,073,154

METAL STAMPING DEVICE Filed May 9, 1955 5 jf v J6 f fifi Patented Mar. 9, 1937 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to metal stamping devices and more particularly to devices for punching identication numbers into machines, castings, bars, etc., of metal.

An object o the invention is to provide a device of the kind described. which will insure that the die of the stamping device impacts against the material to be stamped in a fiat, even manner so as to give a clearly legible stamping.

Another object has been to provide efficient indicating means for indicating the die which is in position for stamping, and also means for truing or aligning the die in proper position and keeping it in said position.

l5 Another object has been to provide means for positioning the die which will insure the die to be positioned in the proper manner automatically.

Another object has been to provide means for sighting the device with respect to the material to be stamped to ascertain its position with respect to the material.

Another object among others has been to provide a stamping device which will have an efficient punching action.

Another object has been to provide a device oi the character described which will be durable and emcient, simple in operation and number of parts, and inexpensive to produce.

To accomplish these objects I have provided a device having a standard and a movable die disk in the standard, movably mounted whereby when the entire device is placed on the material to be stamped, a flat, full, and even contact is had between the die and the material to give a highly satisfactory stamping.

These and other objects and advantages will appear more fully hereinafter.

The invention will be best understood by ref-y erence to the accompanying drawing forming a 4o part of this specication, in which:

Fig. l is an elevational View; Fig. 2 is an end view; Fig. 3 is an enlarged View taken on the line 3 3 of Fig. 2; Fig. 4 is a central section of the device shown in Fig. 3; and

Fig. 5 is a detail section taken on the line 5--5 of Fig. 4.

The concrete exemplication which has been 5o selected to illustrate the principle of my invention and its application, includes a base I0, having upwardly extending walls II and I2 with elongated slots I3 in the walls. The walls are provided with cut-outs I4 as shown in Fig. 5, providing a horizontal face I5 in each wall and (Cl. lill- 29) vertical faces I6. A plunger I'l has legs I8. legs of the plunger are offset interiorly as at i3, having shoulders 23 to provide an enlarged recess 2| and a reduced recess 22 to accommodate a pawl, as will hereinafter be more fully apparent. 5 The legs i8 are adapted to straddle the walls l i and I2. The plunger is adapted to reciprocate in the cut-out portions i4, the vertical faces IS guiding the movement of the plunger. The legs I8 are provided with bores 23 to accommodate a 10 stud 2li which extends also through the slots I3, which stud is also adapted to extend through a bore 25 and a stamping wheel or disk 2G. The stud has a cap 2'! at one end and at the other end has an annular groove 28 for a spring locking 15 member 2S, as shown in Fig. 1.

The stamping wheel or disk 23 on its outer peripheral face 30 has a plurality of raised character dies 3l and notches 32, there being a notch between each pair of dies. Indices 33 are pro- 20 vided on a side of the wheel 26 which may be seen through sight slots 3ft in the walls II in the base I0. A pin 35 is mounted in the plunger I I and is connected to a ratchet 35 normally held by a spring 3l in one of the notches 32 to prop- 25 erly position the dies. While the ratchet does not prevent turning when turning is desired to adjust the wheel, the arrangement is suiiicient to prevent accidental turning and to maintain the dies in a true or aligned condition. 30

The plunger Il is normally held in raised position by means of a pair of springs located in the cut-outs I4. Each spring is located between a shoulder 20 and a horizontal face I5 of one of the walls II and I2, and also between one of the 35 offset walls I9 and the stamping disk, and also between a pair of vertical faces IE in one of the walls I I and I2. By this arrangement each of the springs 38 is bounded and held in position.

The base I0 is provided with an arcuate cut- 40 out portion 39 so as not to interfere with the arcuate wheel when it is hammered down to be stamped and to permit the die to extend therethrough to stamp the material.

It will be manifest from the foregoing that the 45 springs 38, abuting at one end against the walls II and I2 and with the other end against the plunger, cause the plunger and the wheel to which the plunger is connected through the elongated slot I3 to be normally held in elevated position. 50 The wheel may be turned until the desired die is lowermost and the ratchet will Serve to true or align the die. The fact of the true position of the die may be learned from the click of the ratchet in the proper notch and also by attempt- 55 The ing to gently move the wheel to see if it locked by the engagement of the ratchet in the groove. The ratchet will also keep the wheel in the desired true position. When it is desired to stamp material, the device may be placed upon the material with its base resting thereon and the entire device may be properly positioned by sighting through the cut-out portion 39 at the base, it being understood also that the sight slot 34 Will permit the user to determine what die is in lowermost position. With the device in proper position with respect to the material, it can then be assumed that the die itself is in proper position, and the plunger may be struck with a hammer or other device, and a full, ilat, even impact Will be had from the die upon the material to be stamped with a highly satisfactory impression.

It will be understood that While I have shown only one Wheel, any number of Wheels may be used.

The device of my invention has an advantage in respect to safety also, inasmuch as it is not necessary to hold the device in using it. The device may be allowed to rest by itself upon the material to be stamped without any need for holding it, and all that is necessary is to strike the plunger with a hammer.

By means of my device the human element in positioning the die on the material for the hammer blow is entirely eliminated, and a satisfactory result is insured.

While I have shown a, particular spring arrangement and a particular arrangement of plunger, etc., it will be understood that my disclosure relates only to one form of my invention which may take countless other forms.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modication without departing from the spirit of the invention. I, therefore, do not Wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claim.

Having thus described my invention what I claim as new and desire to secure by Letters Patent 1s:

In a metal stamping device, a base having a pair of upwardly extending walls provided with elongated slots and cut out at their upper end to provide a horizontal face and vertical faces in each wall, said base having a foot plate extending beyond the side faces and having a central aperture therein; a plunger having a pair of downwardly extending legs provided with bores and a recess, said legs being adapted to straddle the Walls of the base; a stud adapted to extend through the bores in the legs and the elongated slots in the walls for mounting the plunger in the base; a stamping wheel mounted on said stud; and means for normally holding the plunger and stamping wheel in raised position, said means including springs located between the walls of the base and the plunger, said stamping wheel having visible indicia on one side, and one of the Walls of the base having a sight slot for sighting said indicia.

GUSTAV HOFFMANN.