US134083A - Improvement in nailers for lasting boots and shoes - Google Patents

Description

a. McKAY."

NaiIers for Lasting Boots and Shoes.

N0. 134,083. v Patented Dec. 17, 1872.

I M I AM PHOTO-LITHOGRAPHICCQNX(0SBOI7N53 PRUCESS.)

UNITED STATES PATENT DrFIcE.

GORDON MCKAY, OF CAMBRIDGE, MASSACHUSETTS.

Specification forming part of Letters Patent No. 134,083, dated December 17, 18:72.

To all whom it may concern:

Be it known that I, GORDON MGKAY, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented an Improvement in Nailers for Boot and Shoe Last ing, &c.; and I do hereby declare that the following, taken in connection with the drawing which accompanies and forms part of this specification, is a description of my invention sufficient to enable those skilled in the art to practice it.

The inventionrelates to the construction of a tool designed particularly for use in lasting boots and shoes, for driving lasting nails or tacks, the purpose of the invention being to provide a tool containing in itself the power to drive the nails, or to operate the driver, the tool having-simply to be moved from place to place and the power brought into requisition by the hand of the operator, and preferably bythe same hand that moves the tool. My invention consists primarily in a mailer or naildriving tool, having provision in itself for operating the nail-driver.

Incarrying out the invention I prefer to use p a tool having a compressed-air chamber or reservoir and a valve through which connection may be alternately made and cut off between the reservoir and a piston-chamber, air

being let into the piston-chamber from the reservoir to drive the piston, and communication being then cut off between the reservoir and piston-chamber, and opened between the piston-chamber and the atmosphere, the piston being then thrown up by a spring. The combination of the compressed-air reservoir, pistonchamber, piston, spring, and slide-valve constitutes a part of my invention.

. The drawing represents a sectional view of a tool or mechanism embodying my invention.

a denotes a res ervoir for receivin g compressed 'air, this reservoir having preferably an inlettube, b, controlled by a valve, 0, which valve is forced down as the compressed air strikes it to enter the cylinder, the valve having its seat and permitting the air to pass by it into the reservoir and closing by the action of a spring, d, or by the back pressure of the compressed air within the reservoir when the charging supply is cut off. 6 denotes a pistoncylinder having a fixed connection with the main cylinder a. At the bottom of the cylin der a is a plate, f, between which and a seatplate, 9, is a slide-valve, w. The valve 00 has a pocket or passage, 6, extending through it, and with this pocket a passage, 70, in the plate f communicates, when the valve is in its normal position, as seen in the drawing, the valve being held in this position by the stress of a spring, I. \Vhen the valve is slid forward from this position the pocket '6 passes under the plate f (shutting ofi' communication between it and the chamber a) and over a tube or passage, m, which leads into the pistonchamber a. This chamber contains a piston, 0, (whose head 10 fits and slides in the chamber,) having at its lower end the driver q, the

piston being forced up by the stress of a suitable spring, 1", and down by the entrance of compressed air from the pocket t into the pis ton chamber above the piston. When the slide-valve is thrown back by its spring (after having been pressed forward) the tube or passage m is brought into connection with an exhaust-port, 8, through which and an outletpassage, t, the compressed air escapes from the piston-chamber, after having operated to forcethe piston down and to actuate the driver. The slide-valve may be thrown forward by a bar, it, pivoted at a, this bar being preferably so constructed and arranged that the operator, in grasping the cylinder 0, readily embraces also the bar If.

The operation of the mechanism is as follows: The air reservoir or tank a being charged with compressed air by a suitable air-compresser engine, the tool is held over and against the material to be nailed with the nail-plate 3 against the surface where the nail is to'enter,

a nail or strip of suitable nail-forming material being in the nail-tube q, a nail-forming material being preferably used, and preferably in the form of a strip T-shaped in section, the end of said strip entering the nail-tube through a-lateral guide-passage made of corresponding T-sha-pe, as seen at B, which shows an end view of the nail-plate y, to let the strip through it, the driver, as it descends, not only driving the nail, but cutting it from the strip by the same blow by which the nail is driven. Having the tool held in place, the parts being in normal position, as seen in the drawing, and the pocket t charged with compressed air from the reservoir a, the operator, grasping the cylinder e and bar 25, presses the bar in, thereby moving the slide-valve, cutting off communication between the pocket and the reservoir 11, and bringing the pocket into communication with the tube or passage m, the compressed air expanding and driving down the piston and nail-driver, thereby severing and driving the nail. Pressure upon the bar to being then withdrawn, the slide-valve is thrown back by the spring l, the tube m is brought into connection with the exhaust s, and the piston and driver are then driven up by the spring r, the air above the piston-head escaping through the exhaust, the movement of the slide-valve again bringing the pocket 6 into connection with the passage 7a leading into the reservoir or tank.

by this means, without any power connection, and without any exertion of force by the operator other than to push thevalve forward, the nails are automatically driven, or cut and driven, the instrument being moved from place to place for insertion of the several nails, or the work being moved under the tool and the tool held stationary.

Other power than the compressed air may be used, but I prefer the air as a driver.

I claim- The combination of the air-cylinder a, piston cylinder 0, and the valve and driving mechanism, arranged to operate substantially as shown and described.

GORDON MGKAY.

Witnesses:

FRANCIS GOULD, M. W. FROTHINGHAM.

Images