US1235230A - Can-perforating implement. - Google Patents

Description

C. MYERS.

CAN PERFORATING IMPLEMENT. APPLICATION FILED FEB. 9, 1917.

1,235,230, Patented July 31, 1917.

UNITED STATES PATENT oEEioE. I

CHESTER MYERS, OF ST. LOUIS, MISSOURI, ASSIGNOR TO E. MYERS LYE COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

CAN-PERFORATING IMPLEMENT.

Specification of Letters Patent.

Patented July 31, 1917.

Application filed February 9, 1917. Serial No. 147,728.

To all whom it may concern:

Be it known that I, CHESTER MYERS, a citizen of the United States, residing at the city of St. Louis, State of Missouri, have invented a certain new and useful Improvement in Can-Perforating Implements, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates broadly to metal cutting devices, and specifically to a special form of implement designed for use in perforating sheet metal receptacles of the sort commonly employed as containers for packaged material.

In the use of various materials which are customarily packaged in the familiar tin cans, it is frequently desired to so open or perforate the container that portions of the contents may be utilized from time to time as desired, and the balance retained in the can for storage and protection.

In the utilizing of various materials which are in granular or powdered form, this method of handling the package is particularly desirable. In the use of such materials, it is necessary to provide a discharge aperture of some size in order to permit the discharge of the material, and it is also desirable that the portion of the metal removed or displaced in order to form the aperture, be disposed in such fashion that it will not interfere with such discharge. Consequently, it is desirable that the edges of the aperture be left smooth, that the displaced portion of metal be not left loose as a blank or punching within the container, and that no appreciable bur be left about the margin of the aperture either projecting inwardly or outwardly. An inwardly projecting or ragged bur is undesirable for the reason that it forms a place for the collection of the comminuted material and interferes with its passage. through the aperture, and an outwardly projecting bur is undesirable especially in instances where the familiar rotary or slide closure cap is employed over the sealed cover of the can.

It is the purpose of my invention, accordingly, to provide a form of implement Which may be employed for puncturing sheet metal cans to provide the desired discharge aperture, and to form such aperture in such fashion that the edge of the aperture is left smooth and the metal removed is so shaped and disposed of as not to interfere with the utilization of the container.

In the accompanying drawings, I have illustrated embodiments of my invention,

Figure 1 being a perspective of the preferred form;

Fig. 2 being a sectional view illustrating the utilization of the device;

Fig. 3 being a sectional view of a portion of a tin can showing the manner in which the removed metal is disposed of; and

Fig. i being a perspective illustrating a modified embodiment of the invention.

Fig. 5 is a detail illustrating a third form.

Referring to these illustrations in detail by means of the reference characters applied, let it be understood that the numeral 1 designates a suitable handle for the device, and 2 designates the bit or cutting ferrule. The latter may be circular in cross section or of other form and is made of metal of the proper quality to cut or shear the sheet metal of the container upon which the. device is to be used. In the preferred form of the device,

the bit or cutting ferrule is aflixed to the handle so that it extends to an obtuse angle relative thereto. The extremity or cutting end of the ferrule is formed by making a section across the axis of the ferrule at an acute angle relative to its lower longitudinal surface, which latter surface is designated by the character a. This provides at the lower extremity of the device an entering edge or point which is designated bythe character I), from which leads a shearing edge, designated by the character 0, and

formed by the metal at the junction of the peripheral and sectional surfaces. The sectional surface of the metal forms a curling edge, which is designated by the character d, which curling edge extends about the periphery of the ferrule adjacent theshearing edge and at an angle relative to the longitudinal axis of the ferrule and the lower or guiding surface a.

As illustrated in Fig. 1, the curling surface d lies in a plane which intersects the axis of the handle 1 approximately at the upper extremity of the latter.

In the use of the device, the cutting ferrule is disposed on the metal which it is intended to puncture with the cutting edge or point 7) at the place where the aperture is to be started and with the upper extremity of the handle approximately perpendicularly above the point of contact between the cut ting ferrule and the metal. Then, in any suitable manner, as by blows from the palm of the hand delivered upon the upper extremity of the handle, the device is driven through the sheet metal. In this operation, the point makes the entering puncture and the shearing edge 0 passes through the metal with a clean shearing cut. As the ferrule is forced through the metal, the guiding sur face (4 causes a feed of the cutting portion of the tool in the direction of the slope of the ferrule from the handle, and the curlin surface (Z curls the blank, which is removed by the shearing edge, into a roll as at 4 immediately against the inside surface of the metal sheet which is being cut. The length of the aperture may be governed by the extent to which the ferrule is driven, as the lateral feed, occasioned by the sloping guiding surface (L, is proportionate to the longitudinal penetration of the ferrule. The tool is readily removed when an aperture of the desired size has been formed, and the blank or removed portion of metal is left attached to the can top as a compact roll, in which position it offers no objectionable impediment to the discharge of the material from the can. The cut made by this implement is smooth with no inwardly or outwardly proj ecting bur, such as would interfere with the operation of a supplemental top, such as that illustrated in Fig. 8, which may be rotated to close the aperture.

In the modified form illustrated in Fig. 4., the cuttin ferrule is not disposed at an angle relative to the handle, but is disposed on substantially the same axis. However, the relationship of the shearing edge, curling edge and guiding surface of the ferrule is substantially the same as in the preferred form. In the use of this modification, however, it is necessary that the handle be held at an inclination relative to the sheet of metal which is to be perforated, and the force applied directly on the line of move ment which the cutting ferrule is to take in making the cut.

I am aware that various other changes and modifications may be made in the device illustrated without departing from the spirit of the invention and the scope of the appended claims, as for example the modification illustrated in Fig. 5, wherein the curling surface (Z is continuous across the end of the bit, and the guiding surface a is narrowed to an edge to form a sharp entering point at the extremity of the bit.

IVhat I claim is:

1. An implement of the class described comprising a suitable handle equipped with a terminal cutting ferrule, which ferrule has a peripheral shearing edge and a guiding surface extending at acute angles relative to each other, and a curling edge lying sub stantially in the plane of the shearing edge.

2. An implement of the class described including a handle portion and a bit portion, the latter having a guiding surface and a shearing edge disposed at an acute angle relative thereto across the axis of the bit portion, and a curling edge presenting a surface substantially in the plane of the shearing edge.

3. An implement of the class described in cluding a handle portion and a bit portion, the latter terminating in a perforating edge with a shearing edge and a guiding surface diverging therefrom at an acute angle rela tive to each other, and a curling edge adjacent the shearing edge.

4. An implement of the class described including a handle portion and a bit portion disposed thereon and extending at an obtuse angle relative to the axis thereof, the bit portion having a terminal perforating edge, a shearing edge extending therefrom and toward the axis of the handle, and a curling edge extending adjacent the shearing edge.

In testimony whereof I hereunto affix my signature this 5th day of February, 1917.

CHESTER MYERS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G.

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