US2694850A - Rotary file - Google Patents

Description

NOV. 23, 1954 HAGEN 2,6@4,85

ROTARY FILE Filed Jan. 29, 1952 INVEN United States Patent'() "ROTARY FILE William F.-Hagen, Eastbrange,--N. J. Application January 29, f1: 9"52,1 Seriiil"N0. 26 85797 .1 Claim. (Cl. 29%79) This'invention relates to cutters for use on sand'ersor grinders 'used normally in sandiri'g' or grinding "wood, plastic, soft {metal objects or-the like, such as in pattern making shops, etc.

Spindle sanders -or grinders'utiliiin'g :rotary spindles,

some carrying rubber expanding drums Ifitted with abrasive sleeves of sand paper; garnet paper or like abrasives, and disc sanders -or;grinders utilizing r otary discs having abrasive discs of sand, garnet paper or like abrasives are commonly used in pattern making shops, .woodfa'rid relatively soft metal working .S 1i S, plastic fabricating shops, by hobbyistsand *the like for finishing and often forming articles of various materials. Such machines provide accurate, quick and easy working of the material and result in substantial savings in labor and time. However, the abrasive surfaces of the abrasive sleeves and discs, being of what is commonly known as sand paper, wear rapidly, become clogged with pitch and otherwise rendered unusable after very short time periods of use, requiring frequent changing of the abrasive sleeves or discs with the loss of operating time of the machine,

labor costs of changing the abrasive member together with the cost of the numerous abrasive members used.

An object of the present invention is to provide a cutter which will perform all of the functions of the abrasive members used on such machines in at least a satisfactorily equal manner, in which while the initial cost thereof may be slightly in excess of the initial cost of each abrasive sleeve or disc now in use, will outlast many such abrasive members and thereby more than compensate for any slight increase in initial cost by not only the savings in the cost of the large numbers of abrasive members which it will replace, but will very materially reduce labor costs and time losses occasioned by changing the abrasive members.

Specifically, the invention comprehends a cutter to L replace abrasive members used in such machines which includes a metal carrying spindle having a plurality of hack saw or band saw elements or analogous devices carried thereby, the teeth or cutting surfaces on the edges of which protrude slightly from the surface of the spindle to provide the cutting or grinding action normally provided by abrasive surfaces of the abrasive members.

With these and other objects in view, as may appear from the accompanying specification, the invention con sists of various features of construction and combination of parts, which will be first described in connection with the accompanying drawings, showing a cutter for use on sanding or grinding machines of a preferred form embodying the invention, and the features forming the invention will be specifically pointed out in the claims.

In the drawings:

Figure 1 is a side elevation of the cutter for use on a spindle type sanding machine showing parts thereof broken away.

Figure 2 is a cross section on the line 2-2 of Figure 1.

Figure 3 is an enlarged fragmentary section of the cutter.

Figure 4 is a cross section taken on the line 4-4 of Figure 3.

Figure 5 is a perspective view of a holding cap used in the cutter for holding the cutter blades in position.

Figure 6 is a fragmentary view of a modified form of the cutting blade.

2,694,850 Patented Nov. '23, 1954 Figure 7 is a fragmentary view of another type of cutting blade.

Figure 8 is a cross section on the line '8-8 of Figure 7.

Figure 9 is a simplified side elevation of a spindle grinder-0r sander of the'type on which the cutter is employed.

Referring more particularly to the drawings and the spindle t-ype cutter 'shown in Figures 1 to 9 inclusive, a spindle type sander =or grinder on which the cutter is applicable for use includes a rotary'chuck 1 which is rotated about a vertical axis by any suitable type of power means (not shown). The chuck 1 removably receives a spindle 2 which has a collar-3 rigid thereon. The upper end of the spindle 2 is threaded as shown at '4 and a nut 5 is 'thr'eaded thereon. The cutter generieall-y referred to by the numeral -10 has an axial bore 11 by means of Whichit is mountedupon the spindle 2 with its lower end resting upon the collar 3 and the nut 5 is then threaded upon thethreaded end 4 of the spindle '2 to securely clamp the cutter 10 upon the spindle against independent movement relative to the spindle.

The cutter 10 includes a cylindrical carrier 12 which may be of met'al or any other suitable material and it has a plurality of radial slots 13 cut therein and open ing out through its outer surface. The slots 13 are of such depth that the cutter blades 14 will fit snugly therein with their inner or back "edges fitting tightly against the inner-ends of the slot. In Figures 1 to 4 inclusive of the drawings the cutter blades 14 are shown as being hack saw blades of the usual type purchased upon the open market and having cutting teeth 15 formed on their cutting edges. The teeth 15 of a hack saw blade are inclined longitudinally in one direction as clearly shown in Figures 1 and 3 of the drawings. This is the usual construction of hack saw blade. The teeth 15 also have what is commonly known as set, that is, they are bent laterally slightly, as clearly shown in Figure 4 of the drawings. Also, as clearly shown in Figures 2 and 4 of the drawings, the outer ends of the slots 13 are enlarged for a short distance inwardly from the outer surface of the cylindrical carrier 12, as shown at 16, to accommodate the set of teeth 15. The slots 13 are of such depth that the teeth of the saw blade or cutter blade will protrude slightly beyond the outer surface of the cylindrical carrier 12. To provide the best results it has been found that the teeth should protrude approximately .10 to .015 inch beyond the outer surface of the cylindrical carrier 12 and wherever the term slightly is used in the specification and claims it is to be understood it means approximately these distances.

Hack saw blades have rounded ends as clearly shown at 17 in Figures 1 and 3 of the drawings and holding caps 18 are provided for engagement with the ends of the cylindrical carrier 12 and the ends of the cutter blades 14 to securely hold the cutter blades in position and prevent their movement relative to the carrier 12. The holding caps 18 have flat outer surfaces 19 which engage either the collar 3, the nut 5, or a washer 20, particularly between the nut 5 and the holding cap 18. The inner surface of the holding caps 18 is cut away as shown at 21 providing concave portions 22 near the perimeter of the holding cap. The concave portions 22 are curved so that when the holding caps 18 are clamped against the ends of the cylindrical carrier 12 and the cylindrical carrier 12 is securely held in position on the spindle 2 by means of the nut 5 and collar 3 the holding caps will tightly and snugly fit the curved ends of the cutter blades 14 thereby preventing displacement of the cutter blades.

While the above description and drawings show the cutter blades as being hack saw blades with rounded ends, it is to be understood that band saw blade sections or similar cutter blades may be employed without departing from the spirit of the present invention and that in such cases the blades may have square ends instead of round so that the present invention comprehends the holding caps having recesses in their inner surfaces the contour of the walls of which recesses are so shaped as to tightly fit against the ends of the cutter blades to hold them in position.

In Figure 6 of the drawings the teeth 15 of the cutter blade 14 have their points indicated by dotted lines, cut or ground away, so as to provide straight, sharp outer edges 24 which are parallel to the plane of the longitudinal axis of the cutter blade or are parallel to the back edge of the cutter blade.

Figure 7 of the drawings shows a further modified form of the cutter blade. In this figure and in Figure 8 the cutter blade 25 which fits in the radial grooves or slots in the cylindrical carrier 12 have straight continuous flat outer edges as shown at 26, i. e., they are free of teeth and the cutting is provided by the sharp corners of the cutting edges of the blade.

In inserting toothed cutter blades in the slots in the cylindrical carrier 12 it is desirable to face the teeth of one cutter in the opposite direction to the teeth of the adjacent cutter as is clearly shown at the left-hand side of Figure 1 of the drawings, thus providing over lapping of the cutting action of the teeth of the cutter blade so as to provide a smooth finish on the material being worked upon. If it is so desired, cutter blades having teeth such as the cutter blades 14 and cutter blades having the straight untoothed cutting edge such as the cutter blades 25 may be used alternately or in any desired relation in the carrier head to provide quick cutting by the toothed blades and smoothing action by the straight edged blades.

It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown, but that within the invention defined by the claim.

What is claimed is:

A cutter for use on a sanding or grinding machine inthey may be widely modified eluding a rotary spindle, comprising a cylindrical carrier having a plurality of circumferentially spaced longitudinal slots therein, cutter blades inserted in said slots and having their cutting edges projecting slightly from the outer surface of the cylindrical carrier, said cutter blades having inclined cutting teeth on their cutting edges with all of the teeth of each blade inclined longitudinally of the blade in the same direction, and wherein the cutter blades carried by the carrier are arranged so that the teeth of one blade inclines in the opposite direction of the teeth of an adjacent blade, said teeth being set laterally as in a saw blade, said slots being enlarged near the working surfaces of the carrier to accommodate the set of the teeth.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 842,903 Napier Feb. 5, 1907 927,846 Flett July 13, 1909 1,379,146 West et al. May 24, 1921 1,395,309 Taber Nov. 1, 1921 1,856,887 Scheppy May 3, 1932 2,205,343 Carelli June 18, 1940 FOREIGN PATENTS Number Country Date 372,215 Germany Mar. 23, 1923 505,442 Great Britain May 10, 1939

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