US1083871A - Shears. - Google Patents

Description

D. W. VAN TINE.

SHEARS.

APPLICATION FILED MAR. 21, 1908.

1,083,871, Patented Jan. 6, 1914.

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WTTEE SATE PATENT OFFIQE.

DAVID W. VAN TIN E, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO B. HEINISCHS SONS (30., OF NEWARK, NEYV JERSEY, A CORPORATION OF NEW JERSEY.

SHEARS.

To all whom it may concern:

Be it known that I, DAVID W. VAN TINE, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented new and useful Shears, of which the following is a specification.

This invention relates to an improvement in shears of the type used for cutting sheet metal such as sheet steel, sheet iron and the like.

It has for an object to facilitate the cutting of sheet metal work and especially work involving the trimming of sharp corners, following a sinuous outline, or any cutting in which the direction of the cut is changed. As well known the ordinary metal-cutting shears, or snips are so formed that the jaws interfere with the severed portions of the material and greatly increase the labor of cutting.

It consists of a pair of levers so pivoted as to afford a maximum leverage and provided with cutting jaws having side cheeks or reinforced portions that are cut away to make space for the material as it is severed in a cutting operation.

It further consists of a strengthened or reinforced fulcrum point formed by increasing the area of the metal at this portion so as to withstand all oppositely acting forces during a shearing movement.

For the purpose of illustrating my invention, I have shown in the accompanying drawings one form thereof which is at present preferred by me, since the same has been found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

Figure 1 represents a perspective view of a pair of shears embodying my invention. Fig. 2 represents a perspective View of one of the handles. Fig. 3 represents a section on line wm, Fig. 1. Fig. 4: represents a side elevation of a portion of one of the members.

Similar numerals of reference indicate corresponding parts in the figures.

Specification of Letters Patent.

Application filed March 21, 1908.

Patented Jan. 6, 1914.

Serial No. 422,487.

Referring to the drawings :-1 designates the handles of a pair of levers forming the shears embodying my invention and which have integral therewith jaws 2, faces 3, finished as a plane surface and adapted to be positioned in close proximity to each other. The edges 4- of the face 3 have a taper more or less gradual from the base of the jaw 2 to the toe thereof where they terminate in a sharp point, whereby a finished or clean out may be made in corners of the metal. These cheeks 5 terminate in the outer edge 6 of the jaws which is inclined forwardly, that is toward the toe and curves inward to meet the toe at the termination of the edges 4. By means of this tapered edge also a cut may be made throughout the length of the metal the finish of which is clean and sharp without leaving a burr or ragged edge. Furthermore this taper facilitates close following of a curved outline since there is suiiicient clearance provided thereby, so that the severed portions of the sheet metal do not press against the jaw of the shears to impede the operation.

From the face 8 the jaws 2 taper outwardly forming the inclined checks 5 for the purpose of allowing the cut edges of the metal to be only slightly depressed during the cutting operation. The two parts so far described are pivotally joined together by any suitable means as the bolt 7 and nut 8. This bolt 7 forms the fulcrumv point of the levers from which the handles 1 are offset a suliicient distance to permit an effectual leverage to be obtained whereby the jaws may easily be brought together to shear the material. This offset is formed of an upwardly extending portion 9 which inclines till it reaches a suitable point 10 where it takes a downward direction forming the handle 1. The point 10 where the contour of the handle changes is dependent on the length of the handle and the leverage desired.

Integral with the handles are hand grips 11 which are provided with projecting portions 12 adapted to contact with each other thus forming stops to allow the jaws to come into direct alinement with each other on completing a out. These grip members 11 are preferably located in the same plane to allow ease of manipulation, but as the handles approach the fulcrum point there is a divergence as indicated in Fig. 1 so that the inclined portions 9 throw the jaws directly over one another. In order to form a fulcrum point of exceeding strength to withstand the shearing operation, an excess of material or bulge 13 is provided forming an offset back portion allowing plenty of metal on either side of the fulcrum bolt 7 It will be noted that in cross-section through the fulcrum, the two handle members are practically flat on both sides and of substantially the same thickness as the handle for the reason that there is only a slight strain in a vertical plane at this point, the excess of material as shown at 13 allowing for the shearing strain. As the surfaces 14: approach the rear of the jaw members they have an outwardly inclined portion 15 in order to give a substantial backing to this portion of the jaw where the initial strain in a cutting operation takes place.

It will be apparent that l have devised an exceedingly simple and efiicient shearing implement adapted for the cutting of sheet metal such as steel, iron, copper or the like and one in which, owing to the leverage obtained and the novel shape cutting jaws I am enabled to make a out which will follow readily a sinuous outline or make a sharp turn as desired.

It will be apparent that while I have described my invention as being applicable to cutting metal, it is equally adapted for cutting carpet, linoleum, oil cloth and other heavy or thick material, as will be apparent to those skilled in the art.

Having thus described my 1nvent1on,what

I claim as new and desire to secure by Letone serving as a cutting edge, side cheeks extending outwardly from the side edges and converging with respect to each other, whereby said cutting blades, in cross section, are truncated triangular, a pivot suitably connecting said members, said pivotbeing situated in a plane passing tnrough the center of each of said cutting blades, and an operating handle integral with each blade, offset from the median line of the blades and in the plane thereof, and further laterally otlset out of the plane of the blades, whereby the operating handles are situated in the same plane without cutting away the material forming the members and so weakening the same, and a bulge adjacent the pivot opening on each member on the side thereof opposite to that of the cutting edge.

DAVID W. VAN TINEQ Witnesses:

E. HAYWARD FAIRBANKS,

C. D. MoVAx.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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