US613870A

US613870A - Pruning-shears

Info

Publication number: US613870A
Authority: US
Publication date: 1898-11-08
Anticipated expiration: 1915-11-08

Description

No. 6l3,870. Patented Nov. 8, I898. J.- SIMON. PRUNING SHEARS.

(Application filed Apr. s, 1698.)

(No Model.)

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' NITED STATES PATENT OFFICE.

JOSEPH SIMON, OFSANTA ROSA, CALIFORNIA.

PRUN|NG=SHEARS.

SPECIFICATION forming part of Letters Patent No. 613,870, dated November 8, 1898.

Application filed April 8, 1898. Serial No. 676 910. (No model.) I

T at whom it may concern.-

Be it'known that I, JosErH SIMON, a citizen of the United States, residing at Santa Rosa, county of Sonoma, State of California, have invented an Improvement in Pruning Shears; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to improvements in shears such as are used for pruning purposes.

It consists of the parts and the construction and combination of parts forming the improved shears hereinafter described and claimed.

Figure 1 is a view of the shears. a detail view of the jaw B.

In the usual construction of this class of shears the handles are separated either by fiat or other springs arranged between the bandles at such a point that it takes considerable power to overcome the tension of these springs and the hands of the operator become very tired after using them for a short while.

The object of my invention is to construct a pruning-shears in such a manner that a positive drawing out of the blade may be produced, while the strength of the pivot-joint is increased, and in conjunction with this to provide an automatic opening or separating device for the cutters which will not be hard and tiring upon the hands of the operator.

In my invention, A is one of the handles, having a concaved curved jaw B. C is the other handle, having the blade D fixed to it, with aconvex curvature of the cutting edge, which is essentially coincident with the concavity of the opposite jaw.

In order to produce a drawing out of the blade across the concave opposing jaw, the pivot-pin E, by which the two jaws and their handles are united, is located at one side of a line passing centrally through the blade and between the handles when the latter are closed. This is effected by forming the two handles and jaws with lugs F, which project, respectively, from the rear side of the handle which carries the blade and from the opposite side of the one which carries the opposing jaw. By thus locating the center of motion Fig. 2 is at one side the closing of the handles will cause the cutting edge of the blade to pass the concaved edge of the opposing jaw with a shearing or draw out, which is very effective in severing the limbs when pruning is being done.

In order to open the jaws whenever the handles are released without any necessity of pressure by the hands and at the same time to relieve the hands of the undue strain caused by heavy springs interposed between the handles, I have shown a small coilspring G, one end of which fits over a stud I-I, projecting from the handle 0 at a point close to the hinge-lug. This stud retains the end of the spring in proper position, and the opposite end of the spring fits into a socket or chamber I, which is formed upon the back of the handle A and close to its pivot-lug. The spring is thus supported between the two jaws, having a curvature corresponding to the exterior curvature of the pivot-lugs, and when the handles are closed together the compression of the spring carries it into the chamber, in which one end fits, the stud also following it into the chamber, so that the handles may be closed tight together, and the spring is all taken up and concealed within the cavity. Whenever the handles are released by relaxation of the hand, the elasticity of the spring is sufficient to separate them and open the cutting-jaws ready for another cut.

The leverage and the peculiar drawing action of the cutting-blade, by reason of the location of the f ulcrum-pin out of line with the handles and blades, make it easy for the operator and prevent the tiring of the hands as rapidly as with the ordinary construction.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A pruning-shears consisting of a convex cutting-blade and an opposing concave jaw with extensions forming handles which cross each other rearwardly therefrom, a lug projecting from one side, of the concave jaw, a corresponding lug projecting from the back of the cutting-blade superposed upon and coincident with the first-named lug, a pivot-pin passing through said lugs forininga fulcrum and is inclosed and concealed within the to one side of the blade and jaw, a socket socket when the handles are closed together. 10 formed in the handle of the jaw, a spiral In Witness whereof I have hereunto set my spring fitting and compressible within the hand.

socket, and-a stud upon the opposing handle JOSEPH SIMON. fitting the opposite end of the spring whereby WVitnesses:

said spring lies between the handles close to S. 11. NOURSE,

and concentric with the fulcrum pivot-lugs JESSIE O. BRODIE.