US303314A - Machine for sharpening pencils - Google Patents

Description

(No Model.)

C. A.- NEUBRT.

MACHINE FOR SHARPENING PBHNQILS. NO. 303,314. Patented Aug;4 12, 1884. y

jlllllll III fwn wmp NITED STATES ATENT OFFICE.

CHARLES A. NEUERT, OF BOSTON, MASSACHUSETTS.

MACHINE FOR SHARPENING PENCTILS.l

SPECIFICATION formingvpart of LettersPatei-it No. 303,314-, dated August 12, 1884.

Application filed June 23, 1884/1.- (No model.)

To all 'whom t may concern.-

Bc it known that I, CniinLns A. NnUnR'r,

, of Boston, county of Suffolk, State of Massagrinding-wheel.

. My inventiu consists, primarily, in a rotating pencil holding and feeding chuck, combined with a grinding-wheel, theV surface of whiehis divided into sections which are adapted to reduce or cut away the material of the pencil at different rates of speed, the section 4of the greatestreducing power being arranged nearest to the chuck, while the section having the least power of reduction islocated farthest from the chuck.

My invention further consists in a pencil grinding or reducing wheel and a chuck or pencil-holder having a screw-threadon its eX- terior, combined with an interiorlythreadedstationary support or bearing for the threaded part of the chuck, and with mechanism for rotating the chuck, as will be hereinafter described.

Figure 1 is a front elevation of apencilsharpening machine embodying my invention; Fig. 2, a side elevation there'o'looking iu the direction of the arrow, Fig. l; and Fig. 3 a sectional detail of the chuck or pencil-holder.

The frame A, which may be of any suitable construction to support the operating parts, is preferably provided with the lips c af, and thumb-screw 5, passing through the lower lip,

c', to permit the frame to be clamped or held to a bench, table, or other'support.

The driving-wheel B, having the handle or crank b to enable it to be rotated, is secured on the stud c, attached to the lower part of the frame, and meshes with the long intermediate gear d, firmlyv secured to the shaft D, supported in the bearing 2 of the frame A, and receiving the grinding-wheel E at its other end, -said wheel being held thereon by means of the thumb-nut 3 engaging the screwthreaded end of the shaft l). The grindingwheel is made up of two or more sections or disks, e e el-in the present instance three which are each of different reducing power to the other-that is to say, the periphery of the disk, c, nearest the pencil-holder, (to be presently described,) is rough or provided with a coarse and sharp cutting material, such as sand or coarse emery, while the face of the next disk c is provided with a medium grade of sand or emery., and the face of the last disk, c2, has the finest cuttingior reducing material Vof the three, so that the first disk has the.

greatest reducing action to rapidly cut away or reduce the wood of the pencil as the latter is fed to the grindingwheel,while, as the peucil becomes in a measure roughly pointed,the last disk, e2, or that one farthest removed from the pencil-holder and which has the least power of reduction, acts upon the thin or tapered end of the pencil to properly point the Asame without breaking the thin or reduced end. By this construction, the grindingwheel has variable or different powers of reduction across its face. The grinding-wheel will preferably be made up of disks of wood arranged on a metal hub, 6, and having their faces coated with different grades of sand or emery, and secured together with screws, as shown in Fig. 2.

rThe pencil-holding chuck is composed of an inner split j aw-like sleeve, a, extended through another sleeve, F, provided externally with a fine screw-thread, 8, the inner split part, a, -of the chuck being provided with inclines 10 and with a threaded portion, 12, to receive a nut, 13, which, abutting against the rear end of the sleeve F, may be turned to cause the IOO pencihp, in the chuck, is as in full lines, Fig. 1. The sleeve F has fastened to it the toothed gear f, which engages the long intermediate gear, d, and as the latter is rotated by the toothed wheel B, the sleeve F and chuck are rotated, and at such time because of the fine threads 8 the chuck is moved forward slowly with the pencil, presenting the same to the grinding-wheel, which cuts away the material of the pencil and forms a conical point for it, as represented by the dotted lines. While the chuck is so moved forward, the wheel f is made to travel longitudinally in engagement with the long gear d. The face of the grindingwheel is beveled toward the chuck, as shown, to reduce or sharpen the pencil at the proper angle.

It is obvious, instead of the grinding-wheel made up of sections, that I may use a wheel the grinding-surface of which is uniform.

1. The combination, with a rotating pencilholder or chuck, of a grinding-wheel the face of which is divided into sections the surfaces of which are adapted to reduce or cnt away the material of the pencil at different rates of speed, the section of the greatest reducing power being arranged nearest to the chuck, while the section having the leastpower of reduction is farthest removed from the chuck, substantially as set forth.

2. The grinding-wheel and rotating pencilholder or chuck, provided on its periphery with a fine screw-thread combined witha stationary bearing having at its interior a screwthread to be engaged by the thread on the chuck, whereby the pencil is carried forward automatically as its point is being sharpened, substantially as set forth.

3. vThe rotating grinding -wheel, the long gear on its shaft, the external-threaded chuck or pencil-holder, and toothed gear f, secured thereto, and engaging the long gear d, combined with a threaded hub,f2, and with means, substantially as described, for rotating the long gear and grinding-wheel, to operate as set forth.

In testimony whereof I have signed my naine to this specification in the presence of two subscribing witnesses.

CHARLES A. NEUE-RT.

. Vitnesses:

G. XV. GREGORY, B. J. NoYns.

Images