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Publication numberUS2269749 A
Publication typeGrant
Publication dateJan 13, 1942
Filing dateSep 16, 1940
Priority dateSep 16, 1940
Publication numberUS 2269749 A, US 2269749A, US-A-2269749, US2269749 A, US2269749A
InventorsWilkie Robert John
Original AssigneeContinental Machines
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
File band
US 2269749 A
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Description  (OCR text may contain errors)

R. .J; ,WILKIE Jan. 13, .1942.

FILE BAND Filed Sept. 16, 1940 rv/ A wwm 250175- 1"! Mfr IF Patented Jan. 13, 1942 FILE BAND Robert John Wilkie, Minneapolis, Minn., assignor to Continental Machines, Incorporated, Minneapolis, Minn., a corporation of Minnesota Application September 16, 1940, Serial No. 357,001

7 Claims. (01. 29-79) This invention relates to filing machines of the type shown in Patent No. 2,180,078 issued to Leighton A. Wilkie, November 14, 1939, and refers particularly to the file band thereof.

These machines are quite similar to the conventional band saw in that they have an endless file band composed of a plurality of file elements arranged end to end on a flexible endless carrier trained over spaced pulleys with one stretch thereof traveling in a vertical straight line through a working zone between the pulleys.

Inasmuch as the files must be so secured to the carrier as to permit the carrier to flex as it travels around the pulleys, the files are apt to shift laterally with respect to the carrier and each other.-

In the aforesaid patent interengaging connections between the ends of adjacent file elements are employed for the purpose of holding the ends of the file elements against lateral shifting. These connections are automatically established as the file band enters its straight stretches so that as the band passes through the working zone the connections between the file elements are effective or operative.

So connecting the adjacent ends of the file elements undoubtedly aided materially in maintaining proper alignment, but was found not entirely satisfactory for while the file elements were thus interconnected with each other, their ends were free to shift with relation to the carrier band, which is the only laterally rigid part of the assembly. I

It is therefore an object of the present inven-- tion to provide a file band so constructed that lateral shifting of the individual file elements is positively precluded not only with respect to each other, but also with respect to the laterally rigid carrier.

Inasmuch as these filing machines are employed for precision machining, every precaution must be taken to insure the file elements traveling in their intended path. In the past where the file elements were directly secured to the fiat ribbon-like carrier band, the accumulation of chips or filings behind the file elements and consequently between the file elements and carrier band, constituted a serious threat to the maintenance of the desired accuracy,

The present invention greatly minimizes this objection through the provision of a novel manner of securing the'file elements to the carrier band whereby a substantial portion of the file element is held spaced from the'carrier band so that the presence of chips orfilings will not disturb the accuracy of the position of the file element with relation to its backup or support.

To this end it is another object of this invention to provide a file band wherein the attachment of the individual file elements to the carrier includes a spacer-leaf under an end portion of each file element and projecting therefrom to engage under the free end of the next adjacent file element so that the major portion of each file element is held spaced from the carrier band per se.

With a view toward reducing manufacturing costs and precluding weakening of the flexible carrier band, it is another object of the present invention to provide the spacer leaves with the band carried part of the complementary connections between the band and the ends of the file elements for preventing lateral shifting of the files.

I More specifically, it is an object of this invention to form the spacer leaves with outwardly projecting tongues which engage in grooves formed by sockets in the ends of the file elements.

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 drawing illustrates two complete examples of the physical embodiment 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 perspective view illustrating part of a file band constructed in accordance with this invention with one of the file elements removed to more clearly show the relationship of its socket to the tongue on the spacer leaf;

Figure 2 is a side view of a portion of a file band embodying this invention; and

Figure 3 is a view similar to Figure l illustrating a slightly modified embodiment of this invention.

Referring now more particularly to the accompanying drawing in which like numerals indicate like parts, the numeral 5 designates a flexible ribbon-like steel carrier band, the ends of which are adapted to be connected so as to form one endless unit which, as is customary is trained over the pulleys of the filing machine to be driven thereby.

Inasmuch as the construction of the filing machine forms no part of this invention it has not been shown, and if desired, reference may be had to the aforesaid Patent No. 2,180,078, for an illustration of one form of such a machine.

The flexible ribbon-like band 5 carries the file elements 6 which are preferably identical and consist of rigid rectangular bars having a front abrading surface and sockets or notches I at both ends in their under surfaces.

The width of the file elements is at least equal to that of the carrier band so that no part of the band projects beyond the file, and the backup support (not shown) which supports the file element as it crosses the working zone,.likewise is no wider than the file elements.

Each file element is secured to the flexible carrier band by two rivets B or their equivalent. The rivets 8 also pass through spacer leaves 9, preferably formed of the same material as the band 5 and interposed between the band and the file elements.

The location of the point of attachment of each file element to the carrier band and the relative position of its associated spacer leaf is such that the spacer leaf underlies only an end portion of the file element and projects a short distance therefrom.

It is the leading end of the file element with relation to the direction of motion of the file band which is secured to the carrier.

The projecting end portion of each spacer leaf has a lug [0 formed thereon which constitutes a tongue to engage in the sockets l and provide a tongue and groove connection between the ends of the file elements and the carrier band. This connection, as will be readily apparent, holds the adjacent ends of the file elements against relative lateral shifting, not only with respect to each other but also with respect to the file band by virtue of the nearness of the point of attachment of the spacer leaf to the carrier band. The lug It! may be formed in any desired manner, but preferably consists merely of an outward protrusion struck from the metal of the spacer leaf itself.

The width of the lug should be as close to that of the sockets I as free running clearance will permit and by having the side Walls of the sockets perpendicular with the rear and front surfaces of the file elements and the sides of the lugs sharply defined, the file elements will be securely held against any possible shifting.

By forming the lugs ID on the spacer elements, it will be readily apparent that weakening of the file band is avoided, and likewise cost of production will be decreased due to the simplicity of stamping the spacer leaves in large quantities as distinguished from forming lugs directly on the carrier band.

The, spacer leaves, however, have another important function, namely, that of spacing the file elements from the carrier band, for being considerably shorter than the file elements, it is obvious that a substantial portion of each file element is spaced from the carried band at all times. This reduces the probability of inaccuracies resulting from the accumulation of chips or filings under the file elements during operation of the machine.

In some filing machines heretofore in use, the ends of the file e ment w re ut 0 f? obliquely in a transverse direction for the stated purpose of insuring smooth transfer from one file element to another.

This angular disposition of the juncture between the adjacent file elements under severe strain tended to shift the elements laterally and to avoid this possibility, the ends of the file elements are preferably either square as shown in Figure 1 or formed with an edgewise angularity as shown in Figure 3.

The latter construction provides, in effect, an overlap of the trailing end of the leading file element over the leading end of the next following file element.

From the foregoing description, taken in connection with the accompanying drawing, it will be readily apparent that this invention provides an exceedingly simple but effective manner of making a file band for continuous filing machines which not only incorporates means for insuring proper alignment of the file elements, but also incorporates protection against loss of accuracy due to the accumulation of chips and filings under the file elements, and that it achieves the optimum of simplicity and economy in construction by utilizing the same means to perform both functions.

What I claim as my invention is:

1. A file band for filing machines comprising: a flexible carrier; a plurality of rigid file elements each having a socket in its under surface at least at one end; a plurality of spacer leaves having projections adapted to enter the sockets of the file elements; and means securing the file elements and spacer leaves to the flexible carrier with the spacer leaves confined fiatwise between the file elements and the adjacent side of the flexible carrier and in such a position that the portions of the spacer leaves having the projections, extend from the associated file elements for engagement in the sockets of adjacent file elements to preclude lateral shifting of the files with respect to each other.

2. A file band for filing machines comprising: a flexible carrier adapted to have its ends connected to form an endless band; a plurality of rigid file elements; means for securing the file elements to one side of the carrier; a spacer secured flatwise on said side of the carrier between each file element and said side of the carrier and having a part projecting from one end of the file element for disposition under the end of the adjacent file element; and interengaging means on each spacer projection and adjacent end of the file element for holding the file elements in alignment.

3. In a file band for filing machines: a flexible carrier; a plurality of rigid file elements; a plurality of spacer leaves one for each file element and substantially shorter than the file elements; means rigidly securing the file elements and spacers to the carrier with an end portion of the spacer projecting from one end of each file element to underlie the end of the next adjacent file element, the differential in length between the file elements and spacer leaves spacing the carrier and file elements from each other for a substantial part of the length of the file elements; and cooperating means on the projecting ends of the spacer leaves and the ends of the adjacent file elements under which said projecting ends engage for preventing relative lateral displacement between said parts to thereby hold the file elements in alignment.

4. In a file band for filing machines: a flexible carrier; a plurality of rigid file elements; a plurality of spacer leaves one for each file element and considerably shorter than the file element; means rigidly securing the file elements to one side of the carrier with the spacers clamped between the files and said side of the carrier and with part of each spacer extending beyond one end of each file element to engage under the end of the next adjacent file element; and cooperating tongue and groove means on the spacer leaves and the file elements for holding the adjacent ends of the file elements against lateral shifting.

5. In a file band for filing machines: a flexible ribbon-like carrier; a plurality of rigid file elements; a plurality of spacer leaves one for each file element but shorter than the file elements, said spacer leaves being of stock similar to that of the ribbon-like carrier; means rigidly securing the file elements and spacer leaves to one side of a the carrier with the spacer leaves clamped between the file elements and said side of the carrier and with a part of each spacer leaf projecting from one end of its file element for engagement under the end of the next adjacent file element, the file elements having sockets in their under surfaces at both ends providing the groove of a tongue and groove connection; and a projection struck from each spacer leaf providing the tongue for said tongue and groove connection by which the file elements are held in alignment.

6. In a file band for filing machines: a flexible ribbon-like carrier; a plurality of short spring leaves mounted on the carrier at spaced intervals; a plurality of rigid file elements overlying the side of the carrier on which the spring leaves are mounted and held spaced from the carrier by said spring leaves; common securing means by which the file elements and the spring leaves are secured to the carrier, the securement of the file elements and spring leaves to the carrier being so located with relation to the lengths of the file elements and the spring leaves that the spring leaves are secured near one end leaving their opposite end portions free to flex toward and from the carrier while the file elements overlie the spring leaves at one end portion only, which end terminates short of the adjacent end of the spring leaves so that each spring leaf projects beyond one end of its associated file element; and cooperating means on the projecting ends of the spring leaves and the unsecured ends of the file elements interengageable to hold said unsecured ends of the file elements against lateral shifting and in alignment with the secured ends of the adjacent file elements.

'7. In a file band for filing machines: a flexible ribbon-like carrier; a plurality of short spring leaves mounted fiatwise on one side of the carrier at spaced intervals; a plurality of rigid file elements overlying the side of the carrier on which the spring leaves are mounted and held spaced from said side of the carrier by said spring leaves; common securing means by which the file elements and the spring leaves are secured to the carrier, the securement of the file elements and spring leaves to the carrier being so located with relation to the lengths of the file elements and the spring leaves that the spring leaves are secured near one end leaving their opposite end portions free to flex toward and from the carrier while the file elements overlie the spring leaves at one end portion only, which end terminates short of the adjacent end of the spring leaves so that each spring leaf projects beyond one end of its associated file element; and a tongue struck up from the unsecured end portion of each spring leaf and engaging in a socket formed in the under surface of the unsecured end of the adjacent file element to hold the file elements in axial alignment.

ROBERT JOHN WILKIE.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2431605 *Sep 1, 1944Nov 25, 1947William B BoiceEndless band tool
US2552611 *Nov 15, 1946May 15, 1951Rockwell Mfg CoEndless tool carrier chain
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Classifications
U.S. Classification407/29.11, 29/76.1, 29/76.3
International ClassificationB23D67/00
Cooperative ClassificationB23D67/00
European ClassificationB23D67/00