US749303A

US749303A - Rudolf kronenberg

Info

Publication number: US749303A
Authority: US
Publication date: 1904-01-12
Anticipated expiration: 1921-01-12

Description

PATENTED JAN. 12, 1904.

R. KRONENBBRG. PERFORATING 0R PUNOHING APPARATUS.

APPLIOATIOR FILED FEB, 24. 1903.

N0 MODEL.

' RUDOLF KRONENBERG,

Patented January 12, 1904.

PATENT OFFICE.

OF oHLIes, GERMANY.

PERFORATING on PUNCHING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 749,303, dated January 12, 1904.

Application filed February 24, 1908. Serial No. 144,798. (No model.)

- tical section of the apparatus, and Fig. 2 a plan view.

In the annular body I), with the foot I), exchangeable supporting-pins e are mounted one above the other in rows. The number of pins in each row depends on the diameter or crosssection of the material to be perforated and also on the nature of the said material. For each row of pins a ring f is provided, which is adapted to be rotated by suitable means in proportion to the advance of the perforatingtoolfor instance, mandrel or punch d. For each pin 6 in a row the respective ring f is provided with a recess f, which becomes deeper in the direction of rotation, thereby forming a cam, as shown in Fig. 2. The front surface of each pin 6 is shaped according to the cross-section of the material to be punched and the rear surface according to the recess f, and the said surfaces are in contact with the block and the recess, respectively.

The stamp or punch 03 can be operated in any suitable manner.

The foot or pedestal b is provided with an aperture 0, into which the punch d can enter.

the rings f, so that the rear ends of the pins enter the recess f, whereupon the pins are.

pressed against the block by rotating the rings. It is necessary to provide space for the material displaced by the punch ol. For this purpose the ring f belonging to the uppermost row of pins is first gradually rotated until the pins 6 are at the deepest parts of the recess f This rotation of the ring and outward movement of the pin 6 must take place in exact accordance with the advance of the punch, and so must, of course, the rotation of the following rings. If the perforation is continued through the entire block, all the rings will have to be rotated, but if the perforation only takes place to a certain depth only the rings to the corresponding level will be rotated.

With this apparatus the block remains perfectly straight during the operation, since the displacement of material is uniform toward all sides, and the supporting and guiding of the block by the pins can take place at as short intervals as desired.

After the perforation has been produced and the perforated block or the like removed from the body 6 the pins can be returned to their original positions by rotating or removing the rings f.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed,

I declare that what I claim is- The combination in a punching apparatus, of a stock-holding block, radial pins arranged in series longitudinally of said block and adapted to engage the stock and rings provided with cams adapted to engage the pins in a series or around a circumference whereby the pins may be forced in to engage the stock and then released with the forward movement of the punch to allow for the material displaced thereby.

In witness whereof I have hereunto set my hand in presence of two witnesses.

RUDOLF KRONENBERG.

Witnesses:

A.LBERT KLEIN,

VICTOR W. HELDT.