US1727059A - Metal shears - Google Patents

Description

septs, 1929. R, HEINRICH T 1,727,059

METAL SHEARS Fi'ied Aug. e, 192'? Patented Sept: 3, `1929.

unirsi) i STAT-Es ROBERT Hmmm, OF-RACINB. WISCQNSlN- METAL sHnAns.

Application Viiled. August 6, :1927, Seria1'No.211,172.l

This invention relates to metal shearsy and shape cutters. Y v 1 rlhis invention is an improvement over that disclosed in an application for metal shears, filed May 16, 1927, Serial No. 191,711', in

which I am a jointapplicant, and has in general the same objects as those set forthin such application. f

In sheet metal work it is frequentlyY desirable to form cuts terminating in rounded ends. rThis work has heretofore been done by drilling the holes in the sheet metal to form the rounded ends,y and thereafter making straightcuts to the drilled holes. g

The object of my invention is to provide a new, scientifically designed cutter that isr for use in pattern shops and tool rooms when manufacturing templates and gauges. It cuts sheet metal into any design as easily as l a paper shears cuts paper. It cuts template- `making costs to a full tenth of former slowv inetiicient methods. j

Furthermore, this metal shears and shape cutter is so accurately designed that it can 1' cut sheet metal into any pattern without necessitating much filing.v A few quick, short downstrokes do the work. kThe concave cutting knife shears along any curved line. The semi-circular punch cuts out the hard-to get-at corners. V 4

An embodiment of the invent-ion is shown in the accompanying drawings, in which:

Figure 1 is a sideelevation partly broken away of the device; f

Figure 2 is afsectional' view on the line 2-2 ofFigurel; j, `l ,Y

Figure 3 is a sectional View on the line 3 3 of Figure 1;

Figure 4 is a plan view of the upper blade; Figure .5 is a view showing a piece of sheet metal cut by means of the shears Aand illustrating the type of work performed by the shears. Referring to the drawings, it will be seen that the device comprises a main body portion 1 which is provided with a Vmovable blade 2 pivotally mounted, as indicated at 3, and provided with an operating yhandle 4. This movable blade, as may be seen from Figure 4, is provided with a rounded outer end 5 for a purpose hereinafter to appear. e Pref-` erably, the lower surface of the blade is curved, as shown in Figure 1, so as to get a gradual shearing action from the inner portion of the shears outwardly as the movable blade is forced downwardly.

The body pore@ 1 is provided with an offset lower portion towhich the bladef is j secured bymeans of a pair of screws 7. The

blade 6 is provided with an inwardly turned.

lip 8 (see Figure') which cooperates with the rounded end 5 of themovable blade 2.` The blade 6 is bevelled throughout itslength including the rounded or inwardly curved lip '8, as may be seen from Figures 1 and 2. Further, it is to be noted .that the lopposite edge of the movable blade is also bevelled inthe reverse direction, as may be seen from Figure 2. It is to benoted also from Figure 1, Athat the blade is provided with a cutout 9 extending from the lower edge, asy shown in 1 Figure l, upwardly to approximate its cener. A

Weheny it is desired to make merely a l straight Acut without theiinish of curved ends,

the blade may be reversedto present thev straight edge without the inwardly curved lip. This straight edge cooperates with the blade 2 in the usual manner.

Itis preferable to provide the metal shears with supporting means whereby it may be either securelyk gripped in the vise, as described in our copendingy application, or may be secured to the bench or floor. For instance, a pair of angle iron feet 10 may be secured to thebody portion 1, as shown in Figures 1 and 2. These angle iron feet extend continuouslyonone side from one end ofthe device to the other andon the other side stop short at the linesL indicated by the reference char-` acter l1 in Figure 1. This provides an open space on one side of the device. The body portion 1 is provided' with a'cutout correl sponding to the lines 11 and with sockets 12 which receive the trunnions 13 of. a wedge shaped pivoted lip 14. Thisvpivoted lip,as

maybe seen from Figures 1 and 2, is prefer-.

ably made of twofhlalf sections riveted together witha spacing block 15 between them. v

It is adapted to be gripped between the vise jaws 16 (see Figure 2) and the upward tav pering construction will prevent withdrawal may be used as the ordinary type of metal shears for cutting straight slots, if desired, or by a suitable adjustment, that is to say, reversal of the stationary blade may be used for cutting slots terminating in rounded ends. Y

It will be seen further that the device is very simple in construction and is eminently practical.

TWhile I have mentioned in a general Way certain shapes Which the blades are capable of cutting, it should be distinctly understood that due to this peculiar blade combination I am enabled to cut any desired shape, such as square, hexagon, polygonal, U-shape, halfround, yogee curves, or the like, all of Which configurations can be cut in various sizes.

Although the invention has been described in considerable detail, such descriptlon is intended as illustrative rather than limiting as the invention maybe variously embodied and as the scope of such invention is to be determined as claimed.

I claim:

1. A pair of metal shears comprising a rigid body portion7 a normally stationary plural-edged blade, having a cut-out in one end thereof eXtending from one edge of the blade to approximately the longitudinal eenter thereof, means f-or securing said blade to the body portion with either cutting edge uppermost, a movable blade secured to said body portion and cooperating with the rst Amentioned blade, said movable blade having a rounded end, an inwardly curved end on the first mentioned blade yon one of its cutting edges at one side of the cut-out and having its other cutting edge continuous and straight.

2. A pair of metal shears comprising a rigid body portion, a movable blade pivotally secured thereto and provided With a curved end, means for opening said movable blade, a normally stationary blade having cutting edges on opposite sides thereof and formed With a cut-out portion in one end extending` from one cutting edge to approximately the longitudinal center thereof, one of said cutting edges on the stationary blade having an. inwardly turned lip at one side of the cut-out to cooperate with the curved end of the movable blade, and securing means passing through the body portion and engaging said last mentioned blade approximately along its central line.

In testimony that I claim the foregoing I have hereunto set my hand at Racine, in the county of Racine and State of Wisconsin.

ROBERT HEINRICH..

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