US2526528A - Magnetic layout punch - Google Patents

Description

Patented Oct. 17, 1950 -UNITED STATES PATENT OFFICE 2,526,528 I 'MAGNETIC LAYOUT PUNCH Charles R. Zickler, Charles R..Zickler, Jr., and -Warren 0.. Zickler, Yonkers, N. Y.

ApplicaticniDeceinber 31, 1948, Serial N0. 68,636

' 2 Claims.

This invention relates to a magnetic-layout punch.

It is an object of the present invention to provide a magnetic layout punch-adapted to be placed on a fiat surface having crossed lines for the purpose of retaining a punch over the exact intersection of the lines and to retain the punch in such a manner that it is not easily movable when the hammering action is effected upon the same, and wherein the need for setting up work on a jig, to provide the desired accuracy in the locating of punch holes, is avoided.

Other objects of the present invention are to provide a magnetic layout punch which is of simple construction, inexpensive to manufacture, easy to operate, of compact and sturdy construction and emcient in operation.

For other objects and for a better undestanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which Fig. 1 is a perspective View of a magnetic .layout punch set up on a piece of sheet material and with illustration made to a hammer which is used for striking the punch.

Fig. 2 is a vertical sectional view of the magnetic layout punch as viewed on line 2-2 of Fig. 1.

Fig. 3 is a top plan view of the punch.

Referring now to the figures, l represents a flat sheet of material on which has been disposed, at different locations, crossed lines I l and I2 at the intersection of the same there is to be punched an opening or center mark for the insertion of a drill point.

My layout punch device comprises an external shell I3 having a top inwardly extending flange l4 and a bottom outwardly extending flange l5 serving as a foot portion. On this foot portion are markings l6 and aligned notches l1. These markings and notches are disposed ninety degrees apart and are adapted to be aligned with the respective crossed lines H and I2. Fitted within the external sleeve I3 is a bushing l8 of non-magnetic material containing a hollow permanent magnet I9. Within the magnet is an internal bushing 2| having an outwardly extending foot portion 22 engaging with the bottom of the magnet and an outwardly bent top flange 2 3 resting on the flange I4 of the outer sleeve I3 whereby to positively support the magnet within the outer sleeve l3. The internal bushing 2| is of non-magnetic material and receives a metal punch 24 having a pointed operating end 25 and a top knurled handle portion 26 and a striking at locate a hole in the sheet material It]. As the punch is struck and with the magnetic layout device properly located on the crossed lines H and |2, a center punch mark exactly at the crossing of the two lines is effected after which a center drill can be used to drill through the sheet material. The bottom ends of the bushings, magnet and outer casing are exactly flush with one another and smooth so that good engagement is made with the flat sheet material. The magnet will also hold the punch in place within the inner bushing 2| so that it is unnecessary to hold the punch element 24 when striking the same, providing the sheet material is magnetic. If work is being performed on non-magnetic material, the device will be held in place by hand while striking the punch element.

All parts of the punch are held together with a press fit. The inner bushing 2| can be omitted if desired, whereby to provide a less expensive construction. The punch 24 would, accordingly, ride directly through the permanent magnet H! which may have a smaller internal diameter than that shown.

It will be further understood that our invention is not limited to the embodiment shown and described in our application, and that the principle of using a base of any shape, together with proper layout aligning lines, points or incisions, to suit the particular kind of layout that one may prefer, may also be embodied in our invention.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

Having thus set forth and disclosed the nature of our invention, what is claimed is:

1. A magnetic layout punch having an outer magnetic casing with a bottom foot portion thereon, a permanent inner magnet of hollow cylindrical shape tightly fitted within a nonmagnetic bushing and the outer casing, an inner bushing having a radially extended bottom flange engaging with the bottom end of the inner magnet, said outer casing having a radially inwardly extending flange on its upper end to provide a top face, said inner bushing having a radially outwardly extending flange on its upper end extending outwardly over the top face of the radially inwardly extending flange of the outer casing whereby to retain the inner magnet against outward and QQWnward displacement from the outer casing, and a punch element adjustable through the inner bushing and extendable through the lower end of the bushing.

2. A magnetic layout punch having an outer magnetic casing with a bottom foot portion thereon, a permanent inner magnet of hollow cylindrical shape tightly fitted within a nonmagnetic bushing and the outer casing, an inner bushing having a radially extended bottom flange engaging with the bottom end of the inner magnet, said outer casing having a radially inwardly extending flange on its upper end to provide a top face, said inner bushing having a radially outwardly extending flange on its upper end extending outwardly over the top face of the radially inwardly extending flange of the outer casing whereby to retain the inner magnet against outward and downward displacement from the outer casing, and a punch element adjustable through the inner bushing and extendaable through the lower end of the bushing, and

guide marks ninety degrees apart on the upper surface of said bottom foot portion on the outer casing, adapted to be aligned with crossed lines on a work piece.

CHARLES R. ZICKLER. CHARLES R. ZICKLER, JR.

WARREN C. ZI'CKLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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