US569226A - Metal-shearing machine - Google Patents

Description

3 Sheets-Sheet 2.

(No Model.)

J. B. MGLANE. METAL SHBARING MACHINE.

Patented Oct. 13, 1896.

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J. B. MGLANE.

METAL SHBARING MACHINE.

No. 569,226. Patented Oct. 13, 1896.

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.IARED B. HCLAN, OF READING, MASSACHUSETTS.

METAL-SHEARING MACHINE.

SPECIFICATION forming part of Letters Patent No. 569,226, dated October 13, 1896.

Application tiled February Z8, 1896. Serial No. 581,202. (No model.)

:To @ZZ whom it may con/cern,.-

Be it known that I, JARED B. MCLANE, of Reading, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Metal-Shearing Machines, of which the following is a specification.

This invention relates to metal-shearing machines, and has for its object to provide a simple and eicient machine adapted to be operated by hand and to be quickly adjusted for the performance of different kinds of work, or, in other words, changed from the conditions which are most advantageous when heavy pressure is required, as in cutting comparatively thick and heavy pieces, to the conditions which are desirable when lighter pressure is required.

To this end the invention consists in certain novel features of construction and combinations of parts hereinafter described, and partic ularly pointed out in the appended claims.

Of the accompanying drawings, forming a part of this specification, Figure l represents a side elevation of a shearing-machine embodying my invention. Fig. 2 represents an end elevation of the same. Fig. 3 represents a perspective view of a portion of one of the shear-blades. Fig. 4 represents a section on line 4 4 of Fig. l. Fig. 5 represents a side elevation showing certain additional features. Figs. 6 and 7 represent, respectively, a side view and an end view, showing certain features hereinafter described.

The same letters and numerals of reference indicate the same parts in all the figures.

In the drawings, a represents a fixed supporting-frame, and h represents a stout lever, one end of which is pivoted at b to ears formed at one'end of the frame a, said lever extending lengthwise of the frame, its free end being located at the opposite end of the frame from the pivoted end.

c represents a iixed operating member mounted on the frame a, said member being, as here shown, a shear-blade.

c represents a movable operating member secured to the lever b and arranged to cooperate with the xed member c.

Each of the members c c in a shearing-machine is preferably composed of a rectangular piece of metal, the angles 2 2 2 2 of which form interchangeable shearing or cutting edges, either of which may be brought into operative position by suitably changing the position of the said operating member.v Said members are inserted in recesses formed for their reception in the frame a and lever b, and are secured in said recesses by taperheaded bolts 3, the tapered heads of which engage recesses 4, formed in the ends of the said members. (See Figs. 3 and at.) A single bolt 3, with its accompanying nut 5, is sufficient to secure one of the said members, the tapering form of the head pressing the member endwise against the opposite end of the recess which receives it. Each member is therefore adapted to be quickly secured and removed.

d represents a cam-head pivoted at d' to an ear a', formed on the frame a and comprising two cams G 7, either of which is adapted to bear upon the upper edge of the lever b at a point near its swinging end.

The head d is provided with an operating arm or lever d2, which is grasped by the operator, who is thereby enabled to turn the head in either direction and thus force either of the said cams against the lever b. The cam 6 has alesser total rise from the pivot d' than the cam l7, its rise being more gradual, so that when the cam is thrown to the extreme of its movements (shown in Fig. 1') it gives the lever b a limited downward movement at a comparatively slow rate. The cam 7 has a greater total rise than the cam 6, its rise being more abrupt, so that when the head dand its operating-arm d2 are thrown over to the opposite side of the pivot from that shown in Fig. l the cam 7 will give the lever b a quicker downward movement than that imparted by the cam 6. Owing to the described form of the cams, the cam 6 is enabled to exert greater power upon the lever b and the operating member c' than the cam 7, although moving said lever more slowly and through a shorter path. Hence, when comparatively thick heavy metal is to be cut the cam 6 is employed, the muscular force of the operator being' enabled to cut a plate or piece IOO of metal that could not be cut by the use of ing-arm d2 are reversed to bring the cam 1 into action, thisf cam giving a more rapid, although less powerful, movement to the lever l) and operating member c'. Hence in cutting coinparatively-light pieces the operator can work more rapidly than by the use of the cam G.

The shorter cam of course does not move the lever b to the same extent as the longer cam, and while the latter causes the edge of the blade c/ to pass the edge of the blade c throughout the full length of the blades, the former only causes said edges to pass each other through a part of their length, as shown in Fig. 1. This does not, however, affect the operativeness of the machine, for the material intended to be cut by use of the shorter cam is limited in lateral extent, and in order to sever it it is not necessary that the shearing-blades come together throughout their length. In this connection it is to be noted that it is essential to the successful employment of the double-acting cam that the movable cutting member be carried by a lever, for then under different extents of movement of the lever the blades can be caused to cut, the movable blade always starting from the same position and its cutting edge passing that of the fixed blade through greater or less of its length according as the longer or shorter cam is used.

e represents a guard which is secured to the frame c and is arranged to bear upon the upper side of a piece of metal while it is being cut by theV operating members and prevent the piece from tipping upwardly, said guard, as here shown, having downwardlybent ends e e', which are secured by bolts e2 to the frame ce. The guard may, however, be of any other suitable construction, and may be applied to the frame yin any other suitable way. I prefer to make the guard adjustable, and to this end I have provided additional holes e3 to receive the bolts e2, so that the guard may be raised or lowered on the frame.

To insure operative contact of the blades or operating members c c with each other, I p

provide adjustable bearing-plates f, one of which is shown in dotted lines in Fig. 2, said plates being located in recesses in the ear a and held by set-screws f against one side of the leverb. The said plate and screws press the plate or member c' on the lever h toward the fixed member c. When the contacting sides of the said blades or members become worn, the wear can be compensated for by setting up the screws f.

g represents a curved spring-arm which is engaged at one end with a stud g, affixed lby welding or otherwise to the lever b, and at the other end with a stud g2, affixed to the cam-head CZ, and acts to yieldingly hold the lever Z) in contact with the cam-head, the ends of the spring having a tendency to spring toward each other. By thus supporting the spring I avoid, all resistance by the spring to the downward movement of the lever.

In Fig. 5 I show the lever ZJ provided with an extension b3, to the outer end of which is pivoted a lever b4, connected by arod h5 with a lever 196, which is engaged with the camhead CZ. The rod b5 is adjustably connected to the levers b4 and h6, so that it can be set at various distances from the pivots of said levers. The described system of levers enables the operator to exert greater power on the lever b by grasping the lever h4. Vhen this extra power is not required, the rod h5 may be disconnected and the cam-head operated by the lever h6.

As above indicated, my invention may be embodied in a machine adapted for punching instead of shearing, suitable punchingdies being substituted for the shear blades or members here shown.

For the sake of convenience, I have referred in some of the following claims to the lever b as a carrier and to the lever b4 (shown in Fig. 5) as a primary operating-lever.

In Figs. G and '7 I show the cam-head d provided with a cam-shaped groove d5, which receives a stud CZ on an arm (Z7, affixed to the lever b. Said cam is formed to impart upand-down movements to the lever b through the arm d?, and to hold the lever h at all times in operative bearing against the cam-head. This arrangement is more positive and reliable than the spring g. (Shown in Figs. l and 2.)

In Figs. 6 and 7 I show also a guard or rest e5, composed of an angular bar, the lower end of which is bent inwardly and secured to the bottom of the frame by means of a block e6, secured by a bolt e7 to the frame u.. By loosening the bolt e7 the rest e5 can be released and removed from the machine.

I claiml. In a'machine of the character specified,

the combination of a supporting-frame hav-- IOO IIO

ing a fixed shear-blade; a lever pivoted at one end to said frame and carrying a shearblade adapted to coperate with that on the supporting-frame and a cam-head pivoted to the supporting-frame, arranged to bear on the Swingin g end of the lever, and having two interchangeably-operative differentiated camsurfaces and a median surface nearest the pivot, whereby movement of the cam-head from a position where said median surface engages the lever may operate to engage either cam-surface with the lever, each camsurface having a sufficient total rise to bring the shear-blades together but so dilferentiated that one brings said blades together through a greater portion of their length than the other under the same extent of movement of the cam-head, substantially as and for the purpose described.

2. In a machine of the character specified, the combination of a supporting-frame having a fixed cutting member, a lever pivoted pivot of the head; an arm fastened to the lever and engaging the cam-groove on the 15 upper side of the pivot; and an operating arm or lever on the cam-head.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 19th day of 2o February, A. D. 1895.

JARED B. MCLANE.

Witnesses:

A. D. HARRISON, A. D. ADAMS.

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