US678474A - Metal-cutting shears. - Google Patents

Description

No. 678,474. Patented Jul 16, l90l.

G. J; CAPEW-ELL.

METAL CUTTlNG-SHEARS.

. (Appliention filad Aug. 16, 1900.) (No Ilodel.) 2 Sheets-Sheet l.

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No. 678,474, Patented July 16, I90l. a. J. CAPEWELL.

METAL CUTTING SHEARS.

(Application filed Aug. 16, 1900.) (No Model.) 2 Sheets-Sheat 2.

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UNITED STATES PATENT OFFICE.

GEORGE J. CAPEWELL, OF HARTFORD, CONNECTICUT.

M ETAL-CUTTING SHEARS.

SPECIFICATION forming part of Letters Patent No. 678,474, dated July 16, 1901.

Application filed August 16, 1900. Serial No. 27,085. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE J. OAPEWELL, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Metal-Cutting Shears,of which the following is a specification.

This invention relates to those shears for cutting metal which have-a movable shearblade that is caused by means of a powerful lever to reciprocate at substantially right angles to a stationary blade.

The object of the invention is the production of simple and powerful shears of this nature having the blades so arranged and supported that a continuous sheet or strip may be easily out without being bent out of shape.

Each of the embodiments of the invention illustrated in the accompanying drawings has a frame so shaped that the fixed blade is secured to one side and the movable blade is supported upon the other side, allowing the blades to cooperate for shearing the metal without oifering obstruction to the passage of the severed parts past the blades.

Figure 1 of the views shows a side elevation of one form of shears embodying the invention. Fig. 2 shows an end elevation of this form. Fig. 3 shows a cross-sectional view takenon the plane indicated by the dotted line 3 3 of Fig. 1. Fig. 4 shows a side elevation of another form of shears that embody. the invention, and Fig. 5 is a section taken on the plane indicated by the line 5 5 of Fig. 4.

The frame of the shears shown in Figs. 1 and 2 has a base 6, a bed 7, and a standard 8, that is connected with, but offset from, the rear end of the bed, so that the standard extends in a plane one side of the plane of the bed.

The fixed blade is secured to one side of the frame and the cooperating movable blade is attached to the other side of the frame, which construction is made possible by offsetting the standard from the bed. The fixed blade 9 is located ina mortise in the back face of the bed and secured by bolts 10, that pass through slots 11 in the bed into the blade. The movable blade 12 is loosely held against the front face of the standard by a bar 13, that is fastened by screws 14. A stud 15 is arranged to extend from one side of the movable blade into a slot 16, formed in the wall of the standard for guiding the blade in its reciprocating movement toward and from the fixed blade. A stud 18 connects the upper end of the movable blade with a lever 17, which is provided with a handle 19. This lever is pivoted upon a stud 20, projecting from a block 21, that is located between the back face of the lever and the front face of the standard and has a threaded stem 22, that passes through a slot 23 and back of the standard bears a nut 24. When this nut is loosened, the pivot-block may be moved so as to adjust the lever and the movable blade toward or from the fixed blade. When the movable blade has been properly adjusted, the nut is tightened to clamp the pivot-block in position, and then the set-bolt 25, that turns in a threaded perforation in a lug 2' at the top of the standard, is set against the top of the block to hold it from possible movement upwardly when metal is being sheared. A nut 27 is provided for clamping the set-bolt. A spring 28 is located in a recess in the front face of the standard in such position that it thrusts between the bottom wall of the recess and a pin 29, projecting backwardly from the movable blade. This spring normally holds the movable blade away from the fixed blade. The fixed blade is adjusted and secured in the desired position by means of the bolts 10, and the movable blade is located in the desired relation to the fixed blade by adjusting the lever pivot-block 21. Screws 30, turning in the standard near the lower edge of the movable blade, are provided for keeping the cutting edge of that blade in proper relation transversely with the cutting edge of the fixed blade. The cutting edges of the blades are formed at an angle with each other in order that the proper shearing action may be had.

When the handle is depressed, the movable blade is moved toward the fixed blade in substantially a right line very powerfully, for the connection between the lever and the movable blade is very close to the lever-pivot.

When the handle is released, the spring pushes the movable blade away from the fixed blade and causes the handle to be lifted.

On account of the offset of the frame one part of a sheet of metal that is being severed by these shears may pass without obstruction upwardly and rearwardly on one side, as at 31, and the other part of the severed metal may pass without obstruction downwardly and rearwardly, as at 32, Fig. 2. In other words, as the back face of the bed of the frame is on one side of the plane of severance 33, Fig. 2, and the front face of the standard of the frame is on the other side of the plane of severance, sheets may be sheared and the severed parts may pass backwardly without hindrance. By means of this construction a shear is provided in which large sheets or long strips may be cut by the cooperation of a lever operated reciprocating blade and a fixed blade, the cutting action of which is as powerful at one point as at another along the length of the cutting edges of the blades.

Instead of having the bed for the fixed blade provided with a fiat base, as shown in Fig. 1, the upper end of the standard 3f may be extended l'earwardly and provided with a handle 35, as'shown in Fig. at. In this form of shears the movable blade 36 is held to the standard 3f by the head 37 of a stud 38, that extends through a slot 89 in the standard into the blade. The lever 40 is pivoted to the standard by a stud 41, that is between the handle 42 and the stud 43, that connects the lever with the movable blade. In the form first described the movable blade is closed toward the fixed blade by a lever of the second class and is opened by a spring, while in the second form the movable blade is closed toward the fixed blade bya lever of the first class, and while a spring could be employed the weight of the handle will open the movable blade from the fixed blade, so that a spring for this purpose is unnecessary. In this latter form the frame is offset and the cooperating blades are held to the opposite sides as in the other form and allow the free passage to the rear of the strips which are cut when a sheet is being sheared.

I claim as my invention 1. Metal-cutting shears having an offset frame, an arm fixed to and projecting from one part of the frame, an arm pivoted to and projecting from the other part of the frame in substantially the same direction as the fixed arm, a blade fixed to one side of the part of the offset frame from which the fixed arm projects, a blade movably held to the other side of the part of the offset frame from which the pivoted arm projects, and a stud connecting the pivoted arm and the movable blade, substantially as specified.

2. Metal-cutting shears having an offset frame, an arm fixed to and projecting from one part of the frame, an arm pivoted to and projecting from the other part of the frame in substantially the same direction as the fixed arm, a blade fixed to one side of the part of the offset frame from which the fixed arm projects, a blade movably held to the other side of the part of the offset frame from which the pivoted arm projects, a stud connecting the pivoted arm and the movable blade, and a spring thrusting between the frame and the movable blade and normally holding the movable blade away from the fixed blade, substantially as specified.

3. Metal-cutting shears having an offset frame, an arm fixed to and projecting from one part of the frame, an arm pivoted to and projecting from the other part of the frame in substantially the same direction as the fixed arm, a blade fixed to one side of the part of the offset frame from which the fixed arm projects, a blade movably held on the face of the part of the offset frame from which the pivoted arm projects, a bar fastened to the face of the frame and loosely retaining the movable blade in position, and a stud connecting the pivoted arm and the movable blade, substantially as specified.

4. Metal-cutting shears having an offset frame, a blade fixed to one side of the offset frame, a blade movably held to the other side of the offset frame, a pivot adjustably connected with the frame, means for clamping the pivot in position, means for holding the clamped pivot against movement and a lever mounted upon the pivot and loosely connected with the movable blade, substantially as specified.

GEORGE J. CAPEWELL.

Witnesses:

HARRY R. WILLIAMS, V. R. HoLcoMB.

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