US1678820A - Cutter head - Google Patents

Description

July 31, 192s. 1,678,820

L. T. MEDHOLDT CUTTER HEAD July 31, 1928. 1,678,820

L. T. MEDHOLDT CUTTER HEAD Filed Maron 2o, v1925 2 lshams-sheet 2 Patented July 3l, 1928. i MIIB STATES PATENT OFFICE.

LOUIS T. MEDHOLDT, OF ROCKFORD, ILLINOIS, ASSIGNOR TO MATTISON MACHINE WORKS, OF EOCKFOB-D, ILLINOIS, A. CORPORATION OF ILLINOIS.

CUTTER HEAD.

Application filed March 20, 1925. Serial No. 16,902.

rlhe invention relates to cutter heads of stantially nearer the axis of the cutter than thetype used in moulders and other wood with the prior construction above referred working machines, and the object of the into, with the result that it is possible to opvention, generally stated, is te provide a crate the head at much higher speeds with- 5 head of improved construction whereby the out subjecting the same to undue strain due 60 cutter blades may be more efiectually mountto the action of centrifugal force. ed in the head than heretofore. In the accompanying drawings I have A common form of cutter head at present shown my invention as applied to a cutter in use in the wood working art is a subhead which is one instance comprises a holl stantially rectangular head providing upon low body having four side walls formed in- 55 its outer sides clamping faces for the cutter tegral with opposite end walls and in anblades, the latter being secured upon said other instance comprises a hollow body havfaces by means of bolts having flat heads ing two opposed side walls formed integral entered in undercut or T-slots formed in the with opposite end walls and two side walls l5 faces of the head. Considerable difficulty formed separately from the end walls so 70 has been experienced with heads as thus conas to be removable at will, the separable structed because the blades are subjected to walls being securely held in interengaginfr severe strains and being unsupported by the relation with the end walls. In a copendinr body or head are frequently broken loose application Serial No. 11,059, filed February 20 from the head, the clamping bolts giving 24, 1925, I have shown a cutter head cori- 75 away under the strain. struction in which four side walls are formed Various elforts have, in the past, been separately from the end walls, but clamped made to remedy this difficulty, but such eftogether into a rigid unit. Other embodiforts have not, so far as I am aware, met ments of the invention with various changes 25 with success. My invention therefore has in construction and arrangement may, it is 80 for its especial aim the solution of the diliicontemplated, be produced by those skilled culty in a thoroughly practical manner. in the art without departing from the spirit Thus it is desirable not only that a. rigid and scope of the invention as expressed inV support or backing be provided in the body the appended claims.

of the head for each blade, but it is desirable Figure 1 of the drawings is a fragmentary 85 that the strains incident to clamping each side elevational view of a cutter liead havblade in position in the head be confined to ing four side walls integral with opposite the side wall of the head to which it is seend walls.

cured so as to avoid distorting the head. I Fig. 2 is a longitudinal sectional view 35 attain this result by my invention which through the same. no

consists generally in making the head in Fig. 3 is a transverse sectional view taken the form of a hollow body having interior approximately in the plane of line 3-3 of dimensions transversely of the body substan- Fig. 1. l

tially greater than the diameter of the sup- Fig. 4c is a similar view but taken in the porting spindle passing through the body; plane of line 4-4 of Fig. 1. 95

providing slots 'in the body to receive the Fig. 5 is a fragmentary side elevational blades with their inner ends lying against view of a cutter head having'two side walls the inner faces of the side walls of the body; formed integral with the end wall and two and rigidly securing the blades upon said side walls formed separately therefrom.

inner faces by means of clamping bolts en- Fig. 6 is a transverse sectional view taken 100 tered through the blades and the side walls approximately in the plane of line 6-6 of with which they respectively engage. By Fig. 5.

this arrangement, each of the blades is lirm- Fig. 7 is a similar view but showing the ly supported or backed adjacent its cutting separable wall sections removed.

edge by the rigid side walls, and the strains Fig. 8 is a detached elevational view of a 105 incident to clamping each blade in position part of the means for clamping the head are confined to the side wall to which it is upon the spindle.

clamped. A further advantage is that the Referring first to the form shown in Figs. inner ends of the blades and the major por- 1 to 4l, the cutter head comprises a hollow tion of the clamping means are disposed subbody having opposite end walls 10 and 11 110 clamping faces 21.

apertured centrally thereof to receive the supporting spindle 12 and the clamping means whereby the head is secured to the spindle. Inasmuch as thisclamping means forms, per sano part of this invention, it may be described briefly as comprising a sleeve 13 (Fig. 8) having a conical head 14. at one end adapted to engage with a tapered bearing surface 15 in the end wall 11 of the head. The sleeve is slotted throughout its length so as to be contractible and at the end opposite the head 14- it is screw-threaded as indicated at 16 to receive a clamping nut 17 between which and the end wall 10 is interposed a split conical ring 18 bearing against a tapered surface 19 formed in. the wall 10 of the head. `rllightening the nut 17 serves to .clamp the head centrally upon the spindle 12.

y l have herein shown the body of the head having an outer surface generally cylindrical in form. The end walls are connected by four side walls 20, 20H, 20h and 20. Vxhile the outer sides of these walls are cirr cular or arcuate in form the inner sides are preferably shaped to provide flat inner These in the present instance form a substantially rectangular chamber the transverse dimensions of which are substantially greater than the diameter of the spindle 12, thus providing a space between the spindle and each of the faces 21 for accommodating the cutting blades and their securing means.

Leading' from the interior of the head outwardly through the body at one longitudinal edge of each side wall is an approximately tangential slot 22 having one wall formed as a continuation of the clamping face 21, and upon each clamping` face 21 may be secured a cutting blade 23 the outer end portion of which projects through a slot 22 sliglrtly beyond the outer periphery of the head.

The means for clamping the connecting blades 23 upon their clamping faces 21 preferably comprises, in each case, a bolt 24.- entered through an elongated opening or .slot 25 in the side wall. The blades have their inner ends provided with longitudinal slots 26 for receiving the bolts 24, and preferably the bolt is passed from the interior of the head outwardly through the side wall, the outer end being provided with a nut 27 which together with a washer 28 is countersunk Iin an elongated recess 29 formed in the outer face of the side wall. The head 30 of the bolt is made relatively flat and the sleeve 13 may be cut away upon four .sides as shown clearly at 31 (Fig. 4') to provide increased space for the head 30 of the bolt.

It will be seen that by this construction a firm support or vbacking in the body of the head is provided for each blade, near its cutting edge, and that the blade is clamped in position in such a way that the clamping strains are conned entirely to the side wall to which it is secured, thus avoiding any possible distortion of the head. l

Referring now to Figs. 5 and 6, the construction is generally similar to that shown in 1 to l except that in this instance only the side walls 2O and 2OJ are formed integral with the end walls, the side walls 20a and 20C being made in ,separate approximately segmental sections interengaging at opposite ends with the end walls and secured in position by means of longitudinal clamping bolts 32. In order that these removable wall portions may be securely held in position their opposite ends are shaped to engage in grooves 34 having inclined faces 35 arranged to prevent radial outward movement of these wall sections. The latter are slid edgewise into place and securely clamped against movement in the grooves by means of the bolts 32 which are entered through elongated grooves 35 in the inner faces of the wall sections and near one edge thereof. The opposite ends of the bolts lpass through suitable apertures 37 in the end wallsV 10 and-.11.

lt frequently'is desirable to employ in the cutter head two blades only. It will be observed in this connection vthat the construction shown in Figs. 5V and 6 lends itself readily to the use of twoblades, it being only necessary to remove the separable sections 20 and 20", the clamping of each blade upon its clamping face being entirely independent of adjacent side walls.

I claim as my invention: l

1. A high speed cutter head comprising, in combination, a hollow body having rigid ond and side walls and adapted to be mounted upon a supporting' spindle, the interior dimensions of said body being substantially greater than the diameter of the spindle,

cutting blades having their inner ends lying within the body `and their outer ends projecting therefrom, there through, and radial clamping bolts entered perpendicularly through said blades and the side walls of the body for clamping the being openings inl the body to permit said blades to pass therelll) blades rigidly upon the inner faces of said f side walls, the heads of said bolts being d-isposed between the spindle and the blades upon the inner faces of the body so that tjhe spindle limits inward movement of the olt. i

2. A cutter head of the character described comprising a hollow body having end walls centrally apertured to receive the supporting spindle, and a plurality of side walls rigid with the end walls, the inner faces of said side walls extending to a point close to the adjacent blade and providing clamping surfaces for a pl rality of cutter blades, said body having longitudinally extending ifio lili) slots therein one wall of each of which is flush with the inner face of a side wall, blades entered through said slots and lying against said inner faces of the side Walls, and bolts entered radially through the side walls for clamping the blades in position upon said clamping surfaces.

l 3. A high speed cutter head comprising a hollow body, blades projecting outwardly through the body, the body having end walls and side walls with inner faces against.

which the inner portions of the blades may be secured, and means passing through the side walls of the body for clamping the blades against sail clamping surfaces, al ternate side walls of the body being formed integral with the end walls and the remaining side walls being formed separately therefrom and Vdetachably secured thereto.

ll. A high speed cutter head of the character described comprising, in combination, a hollow body having a pair of end walls and a pair of side walls formed integral with the end walls at opposite sides of the head, each of said side walls providing an inner face upon which a knife blade may be secured, said body also having a second pair of side walls formed separately from said end walls and having bevelled ends adapted to interengage with correspondingly bevelled surfaces on the adjacent sides of the end walls, said second pair of side walls also providing clamping surfaces for knife blades, and means for detachably securing said .second pair of side walls between said end walls.

5. A cutter head of the character. described comprising a hollow body having a pair of end walls and a pair of side walls formed integral with the end walls at opposite sides ofthe head, each of said side walls roviding an inner face upon which a cutting blade may be secured and an opening therein through which may extend a bolt for clamping the blade upon said inner face with the blade supported by the side wall at a point adjacent its cutting edge, said body also having a second pair of side walls formed separately from said end walls but interengaging therewith and each providing a clamping face for a cutting blade, and means for detaohably securing said second air of side wallsbetween said end walls.

6. A cutter head comprising a hollow body generally cylindrical in form and pro viding a substantially rectangular chamber therein, the walls of which are disposed approximately tangentially of the head, and clamping bolts entered radially through the side walls of said body and adapted to clamp cutting blades upon the inner faces of said walls, there being narrow slots in the body through which said blades may project beyond the outer periphery of the body.

7. A cutter head comprising a hollow body having rigid end and side walls and adapted to be mounted on a supporting spindle, cutting blades having their inner ends lying within the body and theirouter ends projecting therefrom, there being openings in the body to permit the blades to pass therethrough, and clamping bolts entered through said blades and the side walls of the body for clamping the blades rigidly to said side walls, said bolts having integral heads disposed between the spindle and the blades and being arranged for limited movement inwardly of the body when t-he cutter head is mounted upon the spindle.

In testimony whereof, I have hereunto affixed my signature. l

LOUIS T. MEDHOLDT.

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