US134185A - Improvement in pruning-shears - Google Patents

Description

E. L. YANCEY.

Pruning Shears. No. 134,185. Patented Dec. 24, i872.

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able, jaws, which are pivoted at a.

jaws have cutting-edges b b on both sides, so arranged that, while one produces the shear- UNITED STATES PATENT OFFTGE.

EDWIN L. YANCEY, OF BATAVIA, NEW YORK.

IMPROVEMENT IN PRUNING-SHEARS.

Specification forming part of Letters Patent No. 134,185, dated December 24, 1872.

To all whom it may concern:

Be it known that I, EDWIN L. YANGEY, of Batavia, in the county of Genesee and State of New York, have' invented a certain Improvement in Pruning-Shears, of which the following is a specification:

General Description.

In the drawing, Figure 1 is an elevation showing the shears in position for cutting on the convex side; Fig. 2, a similar view, showing the shears reversed, and in position for cutting on the concave side; Figs. 3 and 4, views of the ratchet-shank of the movable jaw and the stationary pawl which gives it motion,

. in positions corresponding with Figs. 1 and 2, respectively; Fig. 5, inside view of pawlg lever.

Arepresents the stationary, and B the mov- These in gcnt to sever the limb, the other cuts through the bark on the opposite side, and thus prevents tearing. The shears may either be used, as in Fig. 1, with the convex surface of the movable jaw cutting against the concave edge of the stationary one, or reversed, as in Fig. 2, with the concave edge of the movable jaw cutting against the convex edge of the stationary one. This change Iis made by simply turning the movable jaw on its axis round to the opposite position 5 and it is desirable in cutting limbs in various or difficult positions or at different angles. The shank B of the movable jaw projects outward some distance beyond its pivot, and is provided with a ratchet-head, o. Concentric with the teeth of this ratchet is a pin or screw, d, over which fits the slot g of the lever C. 0n the inside face of the head of the lever is a fixed pawl, j, of proper trian- V gular form, to fit into the teeth of the ratchethead. The slot g is of peculiar construction,

and, in connection with the pawl, forms the principal feature of my invention. It is made elongated, and of sufficient extent to allow the pawl to fall out of the teeth in moving back for a new hold. It has two bearing-sockets, h h, on one end, and a single one, t', at the other, -to catch and hold upon the pin d without slipping, and thus hold the pawl to its engagement in going forward or back. The use of these several sockets or bearings enables the pawl either to press the movable jaw up slowly to the out, tooth by tooth, as in Fig. 1, orto bear it back quickly in the same position for a new hold on another limb 5 or to operate in the reverse position, as in Fig. 2, in which several positions the slot changes its bearings upon the pin. A simply smooth elongated slot would not answer the purpose, as the pin would not hold in any given position. It is only by the use of the depressed socket-bearin gs that I am enabled to reverse the shears and make them effective in cutting in both positions. The elongated space of the slot simply gives the proper retraction of the lever, while the sockets hold it in place.

By this arrangement I dispense with all loose dogs, springs, Snc., and make all the parts stationary, by which a more ecient action is produced, and the apparatus is more simple and less expensive. Ialso adapt the ratchet arrangement to a reverse-actin g shears, cutting either way, right or left, which has never before been done.

By this construction I can give a slow or a rapid cut at pleasure. In Fig. 1, I can feed the cutter up tooth by tooth. In Fig. 2, Ican force the whole cut at a single movement. 1

It will be noticed that in the two different cuts shown in Figs. 1 and 2 the pawl has areversible bearing upon the teeth, in the first case striking against the square shoulder, while in the latter against the incline.

I am aware that a circular ratcheted cutter, pivoted to a movable lever, and operated upon by a pivoted pawl pressed up by a springdog, has before been used. Such I do not claim.

Ola/6m.

"What I claim, and desire to secure by Let.

ters Patent in a double orreverse aetingshears, lIn witness whereof I have hereunto signed ismy name in the presence of two subscribing The lever C, provided with the fixed pawl Witnesses.

fand soeketed slot, when combined With the EDWIN L. YANCEY.

ratchet-head c projecting from and forming Witnesses:

part of the movable jaw, the Whole arranged JOHN L. FOSTER.

as described7 for the purpose specified. O. D. HAMMOND.

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