US1400245A - Cutter-head - Google Patents

Description

C. P. SMITH. DECD.-

A. L. JONES, ADMINISTRATOR- c ImR HEAD. I,4:OO,245. APPLICATION FILED NOV. 5, 1919. 1 11 12 3 I I l .9 I I I I,

I I i 12 I (ID I 1 L? 7 I I I I I I I L I I I I I f I I I I I 10 I I I I 'I -5 I I I'| I I UNITED STATES PATENT OFFICE.

CHRISTIAN P. SMITH, OF SOUTH BEND, INDIANA; ARTHUR I). JONES ADMINISTRATOR OF SAID CHRISTIAN 1. SMITH, DECEASED.

' CUTTER-HEAD.

To all whom it may concern Be it known that I, CHRISTIAN P. SMITH, a citizen of the United States, residing at South Bend, in the county of St. Joseph and State of Indiana, have invented certain new and useful improvements in Cutter-Heads, of which the following is a specification.

The invention relates to a cutter head for wood working machinery, such as shapers and planers, and has for its object the provi sion of means designed for more securely holding the cutting knives upon the. supporting cutter heads. Another object resides in the provision of means for holding or clamping the knives to the cutter head in a manner whichpermits a greater portionof the knife blades, as they are worn away in the sharpening process,- to be used and effectively held to place, thus prolonging the usefulness of the knives materially over the type of cutter heads and knife clamping means as now generally employed, whereby a considerable saving in'the cost of replacements of the relatively expensive cutting knives is effected. Still another objectresides in the provision of a clamping means for holding the cutting knife to the cutter head, which will function to exert a tremendous pressure upon the cutting edge of the knife, and thus prevent shavings and splinters from working in between the knife blade and the cutter head, and acting as a wedge with a tendency to force said members apart.

With the foregoing and other objects in view, the invention in the preferred form of details will be described in the following specification, reference being had particularly to the accompanying drawings, in which Figure 1 is an end elevation, partly in section, of a cutter head embodying the improvement.

Fig. 2 is a top or plan view thereof, with the cutter head in the position shown in Fig. 1.

As appears in the drawings, the cutter head 3 is of the usual form, being provided with T-form slots 4 extending the full length thereof, and outwardly extending lip portions 5 at diagonal corners thereof, the type shown being adapted for the reception of two cutting knives. Inasmuch as the knives and the securing means therefor are identical, a showing of one and description thereof is deemed sufiicient for all practical purposes.

Specification of Letters Iatent. Pate ted D 13 1921 Application filed. November 5, 1919.

Serial No. 335,969.

Adapted to be mounted upon the cutter head 3 is a knife blade 6, having a cutting edge 7, and preferably two or more slots 8 open toward the rear edge of the blade, whereby the blade may be adjusted in effective position, as the cutting edge thereof becomes worn away in the sharpening process, with respect to clamping bolts 9 which pass through said slots. Adapted to bear upon the knife blade is what may be termed a clamp ng bar 10, apertured to permit the clamping bolts to pass therethrough, and which bar is of flexible metal, but flexible only under great stress. Threaded through the clamping bar at the end opposite the cutting edge of the knife blade, are screw members 11, preferably corresponding in num ber with the clamping bolts, and provided with slots 12 for the reception of a screw driver or other suitable tool for manipulating the same. The cutter head is provided with an aperture 13 for the reception of a spindle or shaft (not shown) for revolving the cutter head'at a high rate of speed, as in the manner and for the purpose wellunderstood in the art.

As will be apparent from the drawings, the head ends of the bolts 9 are held in the slots 4 in a manner to anchor the same against movement radially of the axis of thecutter head, while at the same time adjustment thereof may be had lengthwise of the cutter head, which arrangement permits the ready removal of the bolts from the head for replacement or other purposes, and permits adjustment thereof so as to coincide with different spacings between the apertures or slots in difierent knife blades.

The method of manipulating the improved knife clamping means is as follows: The knife edge is'first adjusted with respect to the edge-of the cutter head, and the clamping bar applied thereon, with the screw members 11 in position to permit the clamping bar to be drawn as tight as possible upon the knife blade by manipulation of the clamping bolts, whereupon the screw members are turned to force the clamping bar end remote from the cutting edge of the knife away from the cutter head, which action flexes the clamping bar and brings the end thereof bearing upon the knife blade under still greater stress. In such position of the clamping blade, and with the nuts 14 on the clamping bolts serving as a fulcrum,

great pressure will. be exerted upon the knife blade adjoining its cutting edge, so'

. of the Clamping bar may first be raised away i from the knife blade by the screw members 11, and the bolts 14 then drawn home, with the effect to flex the clamping bar in the same manner and with the same results as first explained; In additionto the advan-' tages already pointedout by the flexing of the clamping bar, the same exerts a constant and powerful tension a ainst the underside.

of the clamping nuts, thus serving as an efiective nut lock, which, considering the highjspeed at which cutter heads are revolved and the danger which may result from'any of the parts becoming loose ordis placed, is of first importance.

While the foregoing is the preferred form of my invention, it is to be understood that I do not limit myself to the precise structure shown and described, as it is obvious that same may be variously modified without departing from the spirit of the invention. 1' i What is claimed is "1., Theicombination with a cutter head having a flatjknife blade receiving surface for the reception of a knife blade, ofa flexible clamping bar having its under face flat and its rear'edge extending beyond the rear edge of the knife blade and disposed on said knife blade, a holding down bolt carried by the cutter head and spaced'from its edges and passing through a notch the knife blade and through an aperture 1n the flexible bar at a point spaced from its edges.

and an adjusting screw threaded through the flexible clamping bar'adjacent its rear edge and rearwardly disposed in relation to the holding down bolt and forming means whereby .the pressure of the flexible clamp- "ing baron the knife blade may be varied from a point adjacent the holding down bolt to its forward edge. W V

2; The combination with a cutter head having a flat knife blade receiving surface for the reception of aiknife blade, ofa flexible clamping bar having its under face flat and its rear edge extending beyondthe rear edge of the knife blade and disposed on said knife blade, holding down bolts carried by the cutter head and spaced from its edges and passing throughnotches in the knife blade and through apertures inthe flexible clamping bar at. points spaced from each other and spaced from its edges, "and adjusting screws threaded through the flex ble clamping bar adjacent itsrear edge and rearwardly disposed in relation'to the holding down bolts and forming means whereby the pressure of the flexible clamping bar on the knife may be varied from a point adjacent the holding down bolts to its forward edge.

ter heads, said device comprising a holding down bolt carried by the-cutter head and spaced from its edge, the face of the cutter head being flat for the receptionof a cutter blade, a clamping bar disposed on the cutter blade and provided With an aperture for the reception ofthe'holding downboit,'a nut threaded onthe holding down; bolt,

3... L knife blade securing device for cut means for flexing upwardly the rear, side of the clamping bar for increasing the pres sure onthe cutter knife from cent the holdingjdown: bolt to its forward edge. V

a point adjain testimony Whereofl my signature.

CHRISTIAN P. SMITH.

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