US1029411A - Shears. - Google Patents

Description

G. ZELL & W. S. SHENK.

SHEARS.

APPLICATION FILED JULY 8, 1911.

Patented June 11, 1912.

Ill. I

SHEARS.

Specification of Letters Patent.

Application filed July 8, 1911.

Patented June 11, 1912. Serial No. 637,493.

To all whom it may concern:

Be it known that we, GEORGE ZELL and WILLIAM S. SHENK, citizens of the United States, residing at Lancaster, in the county of Lancaster and State of Pennsylvania, have invented new and useful Improvements in Shears, of which the following is a specification.

The invention relates to shearing machines, and more particularly to the class of iron shears.

The primary object of the invention is the provision of shears inwhich the cutting blade will be moved toward the work to be cut through the medium of a rack and locking link, and also will be retracted after the cutting operation by means of a lift bar which is manually moved into position for the raising of the cutting blade.

Another object of the invention is the provision of iron shears which possess maximum power, and that are compact in form and also that may be set upon a bench or block, and that will require the least possible leverage in the operation thereof.

A further object of the invention is the provision of shears which are simple in construction, thoroughly reliable and efficient in operation, and inexpensive in manufacture.

With these and other objects in view, the invention consists in the construction, com bination and arrangement of parts, as will be hereinafter more fully described, illus trated in the accompanying drawings, and pointed out in the claims hereunto appended.

In the drawings: Figure 1 is a side elevation of shears constructed in accordance with the invention, the blade carrying arm being in raised position. Fig. 2 is a similar view wit-h the blade carrying arm of the shears in lowered position. Fig. 3 is a sect-ional view on the line 33 of Fig. 1. Fig. l is a top plan view. Fig. 5 is a fragmentary vertical longitudinal sectional view, showing in detail the blade carrying arm and the rack bar. Fig. 6 is a side elevation of the rack bar.

Similar reference characters indicate corresponding parts throughout the several views of the drawings.

Referring to the drawings by numerals, the shears comprise a base 5, preferably of cast metal, the same being formed at opposite ends with vertically and horizontally projecting lugs providing forked bearings 6 and 7, respectively, which are united by a vertical web 8, the latter being offset to one side with respect to the longitudinal median line of the base, and is provided in one side face with a seat 9, in which is removably mounted a stationary cutting blade 10, the bearing 6 being formed at one side with a socketed extension 11, in which is detachably engaged a horizontal gage supporting rod 12, the same being detachably held in the said extension by means of a set screw 13, on which is carried an adjustable gage 14, the same being formed with a collar 15 surrounding the rod 12, and this collar is locked in adjusted position upon said rod by means of a set screw 16.

In the bifurcated upper end of the bearing 6 is arranged one end of a swinging knife blade carrying arm 17, the latter being connected in the bifurcated end of the said bearing by means of a pivot 18, the opposite end of the arm 17 being bifurcated to form spaced parallel ears 19, and cooperative with the stationary blade 10 is a knife blade 20, the same being detachably mounted upon the arm 17, so as to be moved into shearing relation with the said blade for the cutting ofmetal interposed between the said blades, during the operation of the shears.

In the bifurcated end of the bearing 7 is engaged the inner forked end 21 of an operating lever 22, the said forked end being connected in the bifurcation of the bearing 7 by means of a pivot pin 23 passed through the same, so that the lever may be swung vertically for raising and lowering the arm 17 in the operation of the shears. Connected in the forked end 21 of the lever 22 is a pull rack bar 24, one edge of which is formed with a plurality of rack teeth 25 adapted for engagement with a cross pin 26 mounted in the inset ends 27 of a pair of links 28, which latter are pivotally connected, as at 29, to the free end of the arm 17 at a pointslightly rearward of the bifurcation therein, the rack bar being slidably engaged in the said bifurcation in the arm 17, so that on the lowering of the lever 22, the rack bar 2 will engage the cross pin 26, causing the arm 17 to be lowered for the shearing of work interposed between the blades carried by the base and arm, respectively. It is apparent that the arm 17, through the medium of the links 28 and the cross pin 26 adjustably engaging the rack bar 24, may be adjusted relatively to the work to be operated upon by the shears. The rack bar 24 is adjustably connected in the forked end 21 of the lever 22 by means of a removable pin 30 adjustably engaged in the forked end of the lever.

Carried by the lever 22 is a lift bar 31 which is connected thereto by means of a pivot 32 and is formed with a notch 33 adapted to receive the pivot 29 connecting the links 28 to the arm 17, when the lever 22 is being raised, so that the arm 17 may be elevated to retract the blade 20 from the blade 10, after the workhas been severed by the i said blades. This 11ft bar 31 is extended beyond the notch 33 to form a handle 34, whereby the said lift bar may be engaged with and disengaged from the pivot 29, it

i being understood, of course, that the said cutting operation. The rack bar 2 1 may be positively connected to the arm 17 by the use of a pin 35 (see Fig. 5) which is passed through the bifurcated end of the said arm 17 and adjustably engages in suitable apertures formed in the said rack bar 24 which rests in the bifurcated end of the said arm 17, it being understood that the links 28 are shifted to the opposite side of the rack bar 24, so as not to engage with the rack teeth 2 25 thereof, when the said rack bar is positively connected with the arm 17. It will be seen that upon lowering the lever 22, the arm 17 will be swung so that the blade 20 will approach the blade 10, thus cutting the metal bar interposed between the blades for the severing of the said bar. Upon the raising of the lever 22, the blade 20 will be retracted from the blade 10 by reason of the elevation of the arm 17 carrying the said blade 20, and thereafter the cutting operation may be repeated.

Extending outwardly from the vertical bearing 6 are spaced parallel cars 36, while projecting outwardly from the horizontal bearing 7 is a bifurcated ear 37, the same I being arranged in the plane with the lowermost ear upon the vertical bearing, the bearlngs 36 being designed to support a turning screw member 38 ad ustably engaging one end of a rest bar 39, the same carrying at its opposite end a pivoted bolt 40 which is engaged in the bifurcated ear 37, and carries a wing nut 41, while the adjusting screw is also provided with a wing nut 42. Thus by turning the wing nuts, the said rest bar 39 may be adjusted for holding the work, when acted upon by the cutting blades of the copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

shears, it being understood, of course, that the work is passed between the cutting blades, so that one edge of the work will abut against the gage 14:, thereby holding the said work at proper length with respect to the cutting blades of the shears.

Arranged within the fork bearing 6, at

one side of the lmife blade carrying arm, is

a wearing plate 43, and threaded in the said bearing 6, at one side thereof, are set screws 44, which latter are adapted to work upon the wearing plate 43, so as to keep the arm tight and enable the cutting blade carried by the arm to work close to the stationary cutting blade, thereby assuring a clean out upon the bar.

What is claimed is: V

1. In shears of the class described, a base, a swinging arm connected therewith for vertical movement, an operating lever connected with the base for vertical movement, the said arm being provided with a bifurcated free end, a rack bar adjustably connected with the operating lever and working within the bifurcation, means pivotally connected with the arm and engageable with the rack bar, for lowering the said arm on the lowering of the operating lever, cutters carried by the base and arm respectively, and lifting means connected with the operating lever and engageable with the arm for raising the same after having been lowered and having an extension for bringing the said lifting means into and out of connection with the said arm.

2. In shears of the class described, a base, a swinging arm pivotally connected with the base at one end thereof, an operating lever pivotally connected with the base at the opposite end thereof, cooperative cutting blades carried by the base and arm respectively, the said arm being provided with .'a bifurcation in its free end, a rack bar adjustably connected with the operating lever and engaged in the bifurcation in the arm, opposed links detachably connected with the swinging arm and having a cross pin engageable with the rack bar, and a lifting bar pivoted tothe', operating lever and engageable withthe'pivotal connection of the links with the arm for lifting the latter after being lowered by the operating lever.

In' testimony whereofwe aflix oursignatures in presence of two witnesses.

GEORGE ZELL. WILLIAM s. SHENK.

Washington, D. G.

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