US 3517462 A
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Description (OCR text may contain errors)
June 30, 1970 H; A. IMHOF 3,517,462
nnnucme Am) ROUGHING TOOLS Filed Feb. 1, 1968 a Sheets-Sheet 1 Invenior Herman A. [mizaf -By his Aizorney June 30, H. A. IMHQF nanucme AND noueume TOOLS Filed Feb. 1, 1968 z Sheets-Sheet z 4 7 W x V V/Z//////\\\ H f5 \H/I 2% United States Patent O 3,517,462 REDUCING AND ROUGHING TOOLS Herman A. Imhof, Hamilton, Mass, assignor to USM uforporation, Flemington, N.J., a corporation of New ersey Filed Feb. 1, 1968, Ser. No. 702,283 Int. Cl. B24b 9/00 U.S. Cl. 51-128 3 Claims ABSTRACT OF THE DISCLOSURE A tool for simultaneously guiding and reducing the edge of a thin piece of material comprising a driven rotary tapered wheel or disk having a particulate abrasive surface and having spaced therefrom on the same shaft a free wheeling rotary disk which guides the piece of material being reduced.
BACKGROUND OF THE INVENTION Machines have heretofore been used for beveling or skiving the margin a shoe sole or part thereof in order to produce a thin edge which gives the finished shoe an appearance of lightness. Reduction of thickness is also desirable in order to render portions of a shoe sole or other material more flexible. In such a case it is preferable that the reduced portion or scarf be at an angle to the face of the sole thereby allowing a more uniform bend.
It is considered desirable that the opposite edges of the shank portion of a shoe sole be materially thinner than the normal thickness of the sole in order to give flexibility, to permit a superior finish and to cause a light appearance in the completed shoe. To this end, the opposite edges of the shank of the sole are sometimes beveled or skived at a considerable angle.
Not only does the beveled edge or scarf result in greater flexibility, lighter appearance and a better bond but also a stronger bond. The stronger bond between the shoe and sole results because the sole more easily follows the contours of the shoe bottom with less memory and therefore the adhesive is under less continuous stress from the sole memory.
The present invention contemplates a tool for use in preparing a shoe sole which will, without close operator attention, not only skive and reduce the edge of a sole but produce a roughened surface ready for the application of adhesive.
The use of a rapidly rotating tool which has grit deposited thereon of sufficient size to remove the desired material from a workpiece on a single pass will naturally result in a surface which is rough to both sight and touch. The rough surface is desirable in that it provides a superior bonding surface and in the case of a shoe sole a resultant superior shoe.
Many of the machines used prior to the present invention have required the sole to be hand fed under a knife whereas the present invention contemplates a tool which not only reduces the edge portion of a sole but also requires no operator attention in that the angle of reduction, ie the scarf angle is incorporated into the tool and the tool contains its own material guide means.
One object of the invention is to provide a tool whereby a rigid or semirigid piece of material may be beveled or reduced at a given angle while being guided by the tool.
Another object of the present invention is to provide a tool which has an abrasive surface which will reduce and rough the margin of a shoe sole without becoming clogged with the removed material.
In accordance with these objects and as a feature of the present invention, there is provided a tool for reducing the margins of semirigid material which comprises an abrasive surface upon a driven wheel or disk and a guiding disk spaced therefrom for holding the semirigid material against the abrasive surface.
As another feature of this invention, there is provided a tool which reduces or skives the margin of semirigid material at a predetermined angle and to a predetermined distance from the edge of the material. The tool leaves slight ridges and grooves which run parallel to the edge of the material allowing the material to be bent more easily along lines generally parallel to the edge of the material and which receive adhesive more readily. When the inventive tool is used upon a shoe sole, the sole has less resistance to conforming to the shoe bottom than heretofore when with many commercially available tools, the reducing left slight ridges which ran generally perpendicular to the edge of the shoe.
The particular feature which leaves the ridges and grooves is the shape of the tool. It is contemplated in the invention that the contact between the tool and the material reduced be as a plane tangent to a frustum of a cone. The desired contact may be achieved by having either the cutting surface or the guiding surface for the workpiece frustoconical in shape.
The above and other features of the invention including various novel details, construction and combinations of parts will now be more particularly described with reference to the accompanying drawings and pointed out in the claims.
It will be understood that the particular tool embodying the invention is shown by way of illustration only and not as a limitation of the invention. The principles and features of this invention may be employed in various and numerous embodiments without departing from the scope of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS In the drawings,
FIG. 1 is a perspective view of an illustrative tool embodying the invention with the edge of a partially reduced shoe sole in the position it assumes during roughing;
FIG. 2 is a sectional view through an alternative embodiment of the subject invention; and
FIG. 3 is a plan view of the illustrative tool of FIG. 2 with the guide disk partially broken away.
DESCRIPTION OF THE PREFERRED EMBODIMENTS As can be seen in the figures, the reducing tool comprises a lower disk or wheel 4 rigidly connected to a driven shaft 6 and having a plurality of cutting particles 8 (FIG. 1) on its upper beveled surface 9. The particles 8 deposited upon the reducing surface 9 of the disk 4 can be of any desired size but when the tool is used to reduce shoe soles, it has been found that tungsten carbide particles of US. Standard screen size 30+40 are the most desirable. This size particle adequately reduces the margin of the sole, leaves ridges enabling ease in con formity with the shoe bottom, a roughness adequate for bonding and yet a smooth appearing finished shoe.
The shaft is connected to any known rotating power source (not shown). Radially extending in the beveled surface 9 of the disk 4 is a plurality of grooves 10. R0- tatably mounted upon the shaft 6 adjacent to but spaced from the disk 4 on the same side as the beveled surface 9 is an idler disk 12 having a bottom hub 13. The disk 12 is rotatably mounted upon shaft 6 by means of roller bearings 14 which are force fit upon the shaft.
The spacing between the cutter disk 4 and the idler disk 12 will depend upon the amount of reduction desired. To assure a uniform reduction to the predetermined depth the tool is adjusted by moving the cutter disk in accordance with an external gauge and thus accurately setting the distance between the cutter disk and the idler disk which in turn accurately predetermines the depth of reduction. The spacing need only be enough to allow the edge 19 of the workpiece 16 to be in contact with the hub 13 whereby a sharp feather edge will be produced with the scarf Width measured inwardly from the edge 19 at a. maximum. Greater spacing results in a more blunt edge and a narrower scarf.
In operation, a shoe sole 16 or other rigid or semirigid material to be reduced is fed by hand or appropriate mechanical means to the reducing tool 2. The material is kept in contact with the tool so that the bottom surface 17 of the margin of the sole will be in contact with the particles 8 on the then rotating wheel 4, the sole edge 19 will be in contact with the hub 13, and the upper surface 21 of the sole will be held down by the idler disk 12. As the sole is passed through the reducing tool 2, the particles 8 remove a portion of the margin of the sole, leaving a reduced portion or scarf 18. The radially extending grooves 10 are important in that when the tool is used to cut leather or a similar substance, the tool has a tendency to clog with the removed material. The radial grooves allow an exhaust for the removed material and said material will be exited by means of centrifugal force.
As can be seen in FIG. 2, the illustrative tool may well comprise all of the elements heretofore described but incorporating an enlarged hub portion which acts as a flywheel tending to maintain constant speed of the tool during heavy removal periods.
The reducing tool may well be used in conjunction with a through-feed machine such as that disclosed in copending United States application Ser. No. 632,046, now US. 3,435,474, filed Apr. 19, 1967 in the name of the present inventor. The tool is shown in FIG. 2 in conjunction with a table 20, such as that disclosed in the co-pending application. A reading of the co-pending case will show that an individual sole is fed through the machine by means of an automatic feeder and roller combination and the tools are designed to move toward and away from the center line of the machine to follow the contours of a sole passing thereby. Appropriate guides are used to maintain the straight line movement of the sole and to keep the sole in contact with the tool. This tool could very easily be mounted in the same manner upon the same machine.
Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the 'United States is:
1. A tool for providing a reduced margin of predetermined angle and width on a semirigid shoe sole comprising a rotatable shaft carrying a fixedly mounted reducing disk and a freely mounted guide disk, the reducing disk having a particulate, abrading surface in opposing, spaced relationship to a work engaging surface of the guide disk, the guide disk having a sole edge engaging boss portion projecting from the work engaging surface of the same, and, at least one of said surfaces having a frustoconical shape.
2. A tool as in claim 1 wherein the abrasive disk has a plurality of exhausts whereby the material removed is expelled.
3. A tool as in claim 2 wherein the exhausts are radially extending grooves.
References Cited UNITED STATES PATENTS 888,129 5/1908 Tone 51206 2,993,312 7/1961 Holland et a1. 51173 X 3,122,865 3/1964 Kolling 51173 OTH-ELL M. SIMPSON, Primary Examiner US. Cl. X.R. 694-39