US799882A - Tensioning device for scissors and shears. - Google Patents

Description

N0. 799,882. PATENTED SEPT. 19, 1905. J. J. ANDERSON & J. P. FISHER. TBNSIONING DEVICE FOR SGISSORS AND SHEARS.

APPLIOATION FILED JAN.12. 1904.

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UNITED STATES PATENT or'rronf.

JOHN J. ANDERSON AND JOSEPH F. FISHER, OF FREMONT, OHIO, AS SIGNORS TO B. A. BYRNE, OF PHILADELPHIA, PENNSYLVANIA.

TENSIONING DEVICE FOR SClSSORS AND SHEARS.

Specification of Letters Iateni.

Patented Sept. 1 a, 1 905.

Application filed January 12,1904. Serial No. 188,771.

To all, whom, zit may concern:

Be it known that we, JOHN J. ANDERSON and JOSEPH F. FISHER, citizens of the United States, residing at Fremont, in the county of Sandusky and State of Ohio, have invented new and useful Improvements in'Tensioning Devices for Scissors and Shears, of which the following is a specification.

This invention relates to improvements in scissors and shears, and has for its object the provision of anew and novel tensioning means whereby the cutting edges of the blades are held firmly against each other to insure at all times even and uniform cutting, and 'a further Object of the invention is to lessen the wear on thehead of the pivotal screw.

The invention consists in the novel construction and arrangement of the several parts of the device as will be hereinafter described, illustrated in the drawings, and more particularly pointed out in the claim hereunto appended.

In the drawings, Figure 1 is a perspective View of a pair of shears having our improved tensioning device applied thereto. Fig. 2 is a longitudinal sectional view taken on the line 00 00, Fig. 1. Fig. 3 is a top view of one of the blades, the tension-plate being removed therefrom. Fig. 4: is a detail of the tensionplate, partly broken away, showing the screwthreaded opening or aperture for the tensionscrew; and Fig. 5 is a vertical longitudinal section thereof.

Referring to the several views, the numeral 1 indicates a pair of scissors or shears, 2 the bottom or right-hand blade, and 3 the top or lefthand blade. The blade 2 is provided with the usual screw-threaded openingt for the reception of the screw-threaded end 5 of the pivotal screw 6. This blade is of the same construction as the corresponding blade of the ordinary scissors or shears and needs no further description.

The top or left-hand blade 3 is provided with a suitable opening 7, through which the body of the pivot-screw 6 is passed,'and is substantially of the same construction of the corresponding blade of the ordinary scissors or shears, with the exception that the opening 7 is not screw-threaded. This opening 7 is slightly larger than the body of the pivotal screw to permit the free passage of said screwbody therethrough.

The numeral 8 indicates a suitable plate,

preferably curved, as shown, having therein an opening 9, also slightly greater than the diameter of the body of the pivotal screw 6, but smaller than the diameter of the head of said screw. One end 10 of this plate 8 is preferably forked or bifurcated for the purpose of providing'a firm bearing for the end of said plate 8, while near the opposite end 11 is a screw-threaded opening or aperture 12 for the reception of a set-screw 13. v

The numeral 14 indicates a seat in the outer face of the blade 3, into which the end of the set-screw 13 sets when the device is applied to a pair of scissors or shears.

This device is applied to the scissors or shears in the following manner: The blades are placed on one another in the usual way, and the tension-plate 8 is placed on the upper or left-hand blade, curve up, with its opening 9 registering with the openings 7 and 4 of the blades 3 and 2, respectively. The pivotscrew 6 is then passed into these openings and its screw-threaded end 5 screwed into the opening 4: in the blade 2 until the end of said screw is flush with the outer surface of the blade 2 and the head of said screw rests or impinges against said plate 8. The set-screw 13 is then placed in the aperture 12 and turned therein until the end thereof sets in the seat 14 in the face of the blade 3, as is apparent, and when thus assembled said scissors or shears are ready for use. When for any reason it is desired to increase the tension of the shears or scissors, the set-screw 13 is turned down hard against said blade 3, thereby, by reason of being connected with said plate by screwthreads, raising the end 11 and forcing the plate upward against the under side of the head of the pivotal screw, and thereby forcing the cutting edges of the two blades together, whereby the tension of the shears or scissors may be set-to any desired degree-that is, said blades may be so adjusted that there will be no tension at all or they may be tensioned to any degree up to a point where it will be difficult to operate the shears. This latter degree of tension is never of course used, but the extent of movement of the device is desirable for the reason that no matter how great the wear may be on the device such wear can never be so great as to prevent the proper tensioning of the blades, as will be evident. When for any reason it is desirable to loosen the tension of the blades, the same is accomplished by turning the set-screw up until the desired decreased tension is secured.

It is evident that this device may be applied to old as well as new shears by lengthening the pivot-screw suflicient to permit the plate 8 to set under the head thereof.

Having thus described our invention, what we claim, and desire to secure by Letters Patent, is

In a pair of scissors or shears, the combination with a pair of blades, one of said blades having a plain opening and the other a screwthreaded opening therein, and a pivotal screw of a greater length than the combined thickness of the two blades, said pivotal screw setting through the plain opening in one blade and having its end secured in the screwthreaded opening in the other blade, of a curved tensioning-plate having a plain opening therein and a screw-threaded aperture at or near one end thereof, and its opposite end forked or bifurcated to provide two fulcrumpoints upon which said plate rests when tilted, and a thumb-screw adapted to set in the screwthreaded aperture, said tensioning-plate being adapted to set under the head of said pivotal screw with its two fulcrum-points resting on the adjacent blade, whereby, when said thumb-screw is turned down against the adjacent blade, the tensioning plate will be forced up against the under side of the head of the pivotal screw, drawing the blades together and increasing the tension thereof, and loosening the tension of said blades when the thumb-screw is loosened.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JOHN J. ANDERSON. JOSEPH F. FISHER.

Witnesses:

JOHN J. LEHMANN, CLARA STEINHAUSER.

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