US2362979A - Abrasive band - Google Patents

Description

Nov. 21, 1944;

W. T. ANDERSON ABRASIVE BAND Filed Jan. 8, 1944 2 Sheets-Sheet l llulmnuup NOV. 21, 1944. w, T, ANDERSON 2,362,979

ABRAS IVE BAND Filed Jan. 8, 1944 2 Sheets-Sheet 2 H H ga ",6,

'5 H 28 I I Md/o/flyyz/ 145775777 T/lzwemm l6 -l4 Patented Nov. 21, 1944 UNITED ABRASIVE BAND William T. Anderson, Des Plaines, I1l., assignor to ContourSaws, Incorporated, Des Plaines, 111., a corporation of Illinois Application January 8, 1944, Serial No. 517,505

6 Claims. (Cl. 51-188) This invention relates to abrading machines of the flexibl band type, and has as its object to provide an abrading band in which the se ments of the band carrying the abrasive are directly supported against the thrust of the work and rigidly held against displacement from their straight lin movement through the working zone even though the lateral thrust applied on the bands may be substantial.

In the endless band type of abrading or filing machine heretofore in use, the filing or abrading elements were so mounted on the endless flexible carrier that the direct thrust of the work on the abrading surface was applied against the face of the carrier, 1. e., against the flat side of the bandlike carrier. Consequently, the carrier (whether it wa a band or a chain) had to be interposed between the abrading elements and the stationary guide and back-up which supports and guides the abrading elements in their passage through the working zone. It was difficult, therefore, to rigidly support the filing or abrading elements, particularly against lateral thrust.

Hence, this invention has as an object to provide' a bar for abrading elements wherein the actual abrasive surface is along an edge of the segments mounted on the flexible carrier and wherein the rigid guide and back-up directly engages the segments at their opposite edge to support them against lateral, as well as direct, thrust and wherein the flexible band or other carrier is attached to one face of the segment.

Another object of this invention is to provide means for securing the abradin elements 'per se to their carrying segments whereby the abrading elements are engaged only at their ends and no part of the securing means is exposed on the abrading surface.

In this respect, it is a further object of this invention to provide means for removably securing the abrading elements to their carrying segments.

With the above and other objects in view which will appear as the description proceeds, this invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described, and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope of the claims.

The accompanying drawings illustrate two complete examples of the physical embodiments of the invention constructed in accordance with the best modes so far devised for the practical application of the principles thereof, and in which:

Figure 1 is a view diametrically illustrating an abrading machine of the endless band type and showing the application of this invention thereto;

Figure 2 is an' enlarged detail view of one of the segments and illustrating the manner of removably securing the abrading element thereto;

Figure 3 is a perspective view of the component parts of a complete segment including the abrading element, shown separated and in their proper order of assembly;

Figurue 4 is a perspective view illustrating the manner in which the segments are supported in their passage through the working zone;

Figure 5 is a detail cross sectional view through a segment taken on the plane of the line 5--5 in Figure 4;

Figure 6 is a view similar to Figure 2, but illustrating a modified manner of securing the abrading elements to their carrier segments; and

Figure '7 is a detail cross-sectional view taken through Figure 6 on the plane of the lines 1-l.

Referring now particularly to the accompanying drawings, in which like numerals indicate like parts, the numeral 5 designates the frame of an abrading machine which, as is customary in a machine of this type, is substantially C- shaped to define an open throat 6. A work supporting table I is supported on the frame and the space above the table and within the throat 6 constitutes the working zone.

Vertically spaced pulleys 8 and 9 are mounted in the frame of the machine, and an endless abrading band indicated generally by the numeral I0 is trained thereover to have one stretch of the band travel downwardly in a straight line through the working zone.

The band I!) comprises a flexible steel ribbon or tape H of a length to encompass the full orbit of the abrading band and provided with means at the ends thereof (not shown) for separably connecting the same so as to make the band endless. Secured fiatwise to the ribbon II are barlike segments 12. Each segment has a shallow longitudinal groove l3 in the face thereof to reeeive the ribbon I I to which it is secured by rivets or other fastening means I 4. The rivets 14 pass through the bottom of the groove l3 and are relatively close together so that the attachment of each segment to the carrier ribbon is at a relatively localized area of the segment. Consequently, flexure of the band around the pulleys is not inhibited.

Each segment has an abrading element It secured to the front edge thereof, the surface formation of which may be varied to suit the work to be done. In the present instance, the abrading elements shown in one embodiment of the invention are round bars to provide a curved abrading surface while in the other embodiment of the invention they are substantially square bars to provide a flat abrading surface.

In the first instance, the front edge of the segments has a round bottomed groove is to fit the curvature of the abrading element and the ends of the abrading elements are oppositely mitered to provide inclined end surfaces l1. Clamping lugs 18 having inclined faces l9 complementary to the ends I! are drawn down tight onto the segments by screws 20 to removably secure the abrading segments in place. Dowel pins 2! carried by the clamping lugs and fitting into appropriate apertures in the segments guide the clamps for translation toward the edge of the segment.

With this manner of securing the abrading elements to the segments, spaces are left between the ends of adjacent elements, but with the band traveling at a sufficiently high rate of speed, this is not objectionable.

Where the abrading surface should be continuous, the construction illustrated in Figs. 6 and '7 may be employed. In this case, the abrading surface of each element is continuous for its entire length, and the ends of the element have notches 22 to receive clamping members 23. The clamping members 23 are secured to the ends of the segments which are suitably cut out as at 24 to accommodate the clamping members. As in the other case, complementary inclined sur faces on the abrading elements and the clamps draw the elements tight against the segments.

In lieu of the round bottom groove, IS the edge of the segment to which the abrading element is secured may have a square bottomed groove 25 as specifically shown in Fig. '7 and the back of the abrading element may be provided with a tongue 26 to fit this groove.

In both cases, the coaction between the clamping members and the groove in the front edge of the segment locks the abrading element in proper position on the segment.

How the abrading elements are made forms no part of this invention. They may be made of coarse or fine carborundum, or they may be made by compressing suitable powdered metal impregmated with diamond dust to the desired shape.

The back edge of each segment has a deep V- shaped groove 2! to slidably receive the correspondingly tapered front edge of a guide and back-up 28. The guide and back-up is preferably a bar of brass or other metal softer than the metal of the segments 12 so as to take the wear. It is suitably mounted in the frame of the machine by supports engaging its top and bottom ends so that the guide spans the working zone.

The upper end of the guide and back-up is secured to a vertically adjustable post 29 supported from the overhanging arm of the frame. Mounted on post 29 above the guide and back-up 28 are guide pulleys 30 to engage the opposite faces of the segments as they approach the working zone. The arrangement and spacing of these pulleys is such that at least two pair spaced verticall along the path of the band engage a segment at one time. Thus, the segments are firmly guided into proper alignment with the guide and back-up.

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As shown in Fig. 5, the width of the guide and back-up bar is less than that of the segments so that its presence does not interfere with work to be done in relatively narrow channels or passageways.

From the foregoing description, taken in connection with the accompanying drawings, it will be readily apparent to those skilled in the art that this invention overcomes many of the problems and difiiculties of past abrading machines.

This application is a continuation in part of the copending application of William T. Anderson, Serial No. 516,291, flled December 30, 1943.

What I claim as my invention is:

1. In an abrading machine, the combination of an endless flexible carrier mounted to travel in a straight line through a working zone; a plurality of work performing segments mounted on said carrier, each of said segments comprising a bar-like supporting member secured fiatwise to the carrier and a bar-like abrading element removably secured to and extending along one edge of the supporting member; a guide and back-up for supporting the segments as they move through the working zone, said guide and back-up having a tapered front edge and having an all-over width no greater than that of the segments; and the bar-like supporting member 01 each segment having a tapered longitudinal groove to receive the tapered edge of the guide and back-up.

2. In an abrading machine: a flexible bar-like carrier mounted to have straight line movement through a working zone; bar-like segments secured flatwise to said carrier in a manner to permit fiexure oi the carrier around supporting pulleys and end to end disposition of the barlike members as they move through the working zone; an abrading element for each bar-like segment; means removably securing an abrading element to one edge of each bar-like segment; and a rigid guide and back-up for supporting the segments in their passage through the working zone, said rigid guide and back-up having an engaging sliding tongue and groove connection with the bar-like segments to rigidly Support the same against direct and lateral thrust applied on the abrading elements.

3. In an abrading machine: a flexible endless band trained about supporting pulleys to have a stretch thereof travel in a straight line through the working zone of a machine; bar-like segments secured flatwise to said band with the band recessed into one face thereof; an abrading element for each segment; means removably securing an abrading element to one edge of each segment, the opposite edge of each segment having a substantially V-shaped longitudinal groove; and a rigid guide and back-up of a length to be simultaneously engaged by a number of segments, said rigid guide and back-up having a substantially V-shaped edge to fit the longitudinal groove in the segments and having an allover width no greater than that of the abrading elements.

4. A flexible band for abrading machines comprising: a plurality of similar bar-like segments each having a longitudinal groove in one face thereof; an abrading element for each segment; means engaging only the ends of the abrading elements and clamping one to one edge of each segment; a flexible carrier band received in the longitudinal grooves of the segments; and means for securing each segment ata localized area thereof to said flexible band.

5. A band for abrading machines and the like comprising: a plurality of flat bar-like segments each having an abrading element along one edge thereof, said abrading elements being separate from the bar-like segments; means engaging only the ends of the abrading elements for clamping the same to their respective bar-like segments; and a flexible carrier having all'of said bar-like segments secured flatwise thereto.

6. An abrading band for abrading machines and the like comprising: a plurality of identical flat bar-like segments each having a shallow longitudinal groove in one face thereof and a deep V-shaped groove in one edge thereof; an abrading element for each segment; clamping means engaging only the ends of the abrading elements for securing the same to the edge of each segment opposite its V-shaped groove, said clamping means and the portions of the abrading elements engaged thereby having complementary inclined faces so disposed that the tightening of the clamping means firmly locks the abrading elements to the segments; a flexible carrier; and means for securing all of the segments to the carrier with the carrier received in the shallow longitudinal groove in one face 0! the segments and with the securement concentrated at localized points on the segments to permit flexure of the band around supporting pulleys as well as straight line movement along a line defined by a guide slidably engaging in the longitudinal V-shaped grooves of the segments.

WILLIAM T. ANDERSON.

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