US2219602A - Shearing tool - Google Patents

Description

5. l. RAYNER SHEARING TOOL Oct. 29. 1940.

Filed Dec. 20, 1938 m N m M A r TOR/VEy Patented Oct. 29, 1940 SHEARING TOOL 'Samuel I. Rayner, San Jose, Calif., assignor of one-half to Donald R. McCormack, San Jose,

Calif.

Application December 20, 1938, Serial No. 246,813

Claims.

The present invention relates particularly to shears for cutting corrugated sheet material such as corrugated iron. While corrugated cardboard or other material may be cut with equal facility,

5 corrugated iron willbe specifically referred to in the following specification.

It is one object of the present invention to provide a tool of the character indicated that may be quickly and easily made operable to out either corrugated material or fiat material.

It is another object of the invention to provide a tool of the character indicated constructed and arranged to hold the material firmly in place during the cutting operation, and to effect the cutting cleanly and accurately without deformation of the sheet.

It is still another object of the invention to provide a tool of the character indicated that will be economical to manufacture, positive inoperaposed in spaced parallel relation to each other as 7 shown. These plates are mounted upon a handle 3 at one end, which handle forms a spacing means for that end, and upon a link 4 at the other end, which link forms a spacing means for that end. The plates I, 2 are oblong in form, each plate having one of its longer edges straight and the other long edge undulating as shown at Ia and lb respectively, and 2a and 2b. These undulatory edges form a seat for the material to be cut, and of course the undulations have the same curvature as said material.

In the present instance the link 4 is bolted between the plates I and 2 as at 5 and has holes 6 and I formed therein and equally spaced on opposite side of bolt 5. The plates I, 2 are also bored through as at 8 so that the link may be rigidly tion, simple in form and construction, strong,

is a blade I0, this blade being disposed to lie in the plane of link 4 and to slide snugly between plates I and 2.

The cutting edge of the blade I0 is formed into spaced teeth-as at II, I2, I3, I4 with interven-' ing substantially straight edges I5, Iii, H, the edge asa whole being angularly disposed relative to the lever B, and the edge parts I5, IE5, I? having varying angular relationship thereto. The

teeth II, I2, I3, I4 are so spaced that when the blade is brought down to enter the slot I8 between the plates I, 2 they will successively enter the sheet metal, shown in dotted lines at I9, at the lowest and highest points of its undulations. The angularity of the edge sections I5, It, I1 and 29 is such that they cut in both directions from the entering tooth, each tooth entering the metal before the preceding portion has been entirely cut away, thereby holding the sheet solidly on the plates.

In the initial movement of the blade the tooth II enters the metal at I I a, then passes through positions I lb and I Ic, cutting in the direction I Id. During this operation the tooth I2 enters the metal at I2a and passes through the positions I 2b and I2c, with the edge portion 25 cutting in the direction 15d, and the edge portion I6 cutting in the direction ltd. Before the edge portion I 6 has cut entirely through the tooth I3 has passed through positions I3a, I3b to E30 where it enters the metal. This is followed by tooth I4 passing through positions I411, I41) and Me where it enters the metal and is followed by edge I! cutting in the direction I'Id. In the cutting operation described'a ribbon is cut out corresponding to the width of the slot I8.

If it is desired to cut fiat metal, then the bolt 2I is removed, the link 4 is swung around into the position shown in Figure 3, and the bolt ZI replaced through holes I and la. A blade as 22 on lever 8 and having a suitable cutting edge 23 may now be used in a manner similar to blade II].

It will be noted that in the device described the rear edges of the several teeth are concentric with the pivotal point of the lever 8 so that they exertno pressure against the metal tending to displace the same.

Although a certain specific embodiment of the invention has been illustrated and described it will be understood that variousalterations in the 50 details of construction and mode of assembly may 1 be made Without departing from the scope of the invention as indicated in the appended claims.

I claim:

1. Ina shearing tool including a pair of spaced parallel plates disposed to form a slot and having their corresponding longer edges similarly undulated to form a seat for corrugated sheet material, and a shearing blade pivotally mounted thereon in spaced relation to said plates and movable into the slot between the plates, said blade having spaced teeth formed thereon with intervening cutting edges, said edges being disposed to cut in opposite directions from the point at which each intermediate tooth enters corrugated material on the plates and said teeth cutting only in the direction of said pivot.

2. In a shearing tool including a pair of plates disposed to form a slot and having corresponding longer edges similarly undulated to form a seat for corrugated material and to form cutting edges therefor, and a blade pivotally mounted on the plates to enter said slot; said blade having teeth formed thereon spaced apart substantially equal to the spacing ofthe highest and lowest points of the undulations in the plates and adapted to engage the material at such points, those edges between the teeth being disposed to form obtuse angles with the teeth whereby to cut the material in opposite directions from the points of entry of the teeth into the material.

3. In a shearing tool including a pair of spaced parallel plates disposed to form a slot and having their corresponding longer edges similarly undulated to form a seat for corrugated material, and a shearing blade pivotally mounted thereon in offset relation to said plates and movable into the slot between the plates; said blade having spaced teeth formed thereon disposed to enter the lowest and highest points in the undulations of the material in succession and said teeth being formed to out only in the direction of the pivotal mounting.

4. In a shearing tool, including a bed plate having an upper shearing edge formed to conform to the undulations of a piece of corrugated material, a shearing blade, and a pivot connecting said shearing blade to said bed plate for cooperationtherewith; a plurality of spaced teeth on said shearing blade, the edges of said teeth facing towards said pivot connection being formed to provide cutting edges, the edges of said teeth remote from said pivot being defined by arcs concentric with said pivot, and intermediate shearing edges on said shearing blade between said teeth.

5. The structure of claim 4, and said teeth being spaced apart a distance substantially equal to the space between the highest and lowest points of the corrugations of said material and adapted to engage the material at such points.

SAMUEL I. RAYNER.

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