US2719389A

US2719389A - Abrading disc or head

Info

Publication number: US2719389A
Application number: US466517A
Authority: US
Inventors: Leslie K Singley
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-11-03
Filing date: 1954-11-03
Publication date: 1955-10-04
Anticipated expiration: 1972-10-04

Description

0st. 4, 1955 1.. K. SINGLEY ABRADING DISC OR HEAD Filed Nov. 5, 1954 INVENTOR Lzsua KSINGLEY ATTORNEY ABRADTNG iBlSC (BR HEAD K. Singley, Hendersonviile, N. C.

Application November 3, 1954, Serial No. 466,517

6 Claims. (01. 51-197) The present invention relates to an abrading or sanding disc or head for use on power tools and the like.

A primary object of the invention is to provide an improved sanding disc for use upon a drill press or the like and designed particularly to facilitate the use of standard square sand paper, abrading cloth and the like.

Another object is to provide novel and simplified means for readily detachably securing the square abrading sheet to the disc, in a manner so that the sheet will be securely held in place at its four corners.

A further object is to provide an abrading disc or head for rotary power tools which is octagonal so that the four corner portions of the abrading sheet, which is square, may be turned up and over alternate marginal edge portions of the disc.

Another object is to provide simplified clamping means for securing the corner portions of the abrading or sanding sheet in place upon the disc, and including adjusting nuts which are restrained against separation from their screwthreaded studs, so that they cannot fly off of the studs during the operation of the same.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings, forming a part of this application, and in which like numerals are employed to designate like parts throughout the same,

Figure l is a plan view of a sanding disc or head embodying my invention,

Figure 2 is a side elevation of the same,

Figure 3 is an enlarged fragmentary central vertical section taken on line 3-3 of Figure 1,

Figure 4 is an enlarged vertical section taken on line d-- iof Figure l, and,

Figure 5 is a further plan view of the device on a reduced scale showing the position of the square abrading sheet and the clamps, prior to securing the four corners of the sheet to the disc.

in the drawings, where for the purpose of illustration is shown a preferred embodiment of the invention, the numeral designates generally a flat disc or plate of wood, plastics material, fibre board or the like. The disc is substantially rigid or stiff, and may be of considerable thickness, as shown. The flat disc 10 is octagonal in shape to facilitate using square sheets of sand paper or other suitable abrading material with the same, as will be fully explained. The lower surface of the disc 10 is preferably entirely covered by a resilient pad 11 of sponge rubber or the like, although felt or other suitable material may be used for the pad 11 if preferred. The pad 11 is of course also octagonal.

A metal hub 12 is arranged centrally upon the opposite side of the disc ill, and includes a mounting flange 13, integral therewith, and rigidly secured to the disc it by suitable screws il or the like. An adapter pin or shaft 15 is detachably rigidly secured within the bore of the hub 12 by means of a set screw 16, or the like. The adapter pin i5 is readily engageable within the chuck of a drill press or similar power tool used to impart rotation to the tes Patent 0 2,719,38 9 Patented ct. 4, 1955 disc lltl during its use. I also intend making the bore of the hub 12 screw threaded for receiving a screw-threaded shaft or spindle of a power tool or motor, in which case the adapter pin 15' and set screw 16 will not be employed. Any other suitable or conventional means of connecting the disc ill with a power tool may be employed if preferred.

The disc id is provided just inwardly of and parallel to alternate marginal edge portions 17 of the disc and in the upper face thereof with grooves or recesses 18, as shown. These grooves are four in number and elongated so as to extend along a considerable portion of the lengths of the adjacent marginal edge portions 17. The grooves or slots 18 are preferably arcuate or rounded longitudinally and transversely, as shown in the drawings, but they can be formed square in cross section or otherwise if pre ferred.

inwardly of and at the longitudinal center of each groove 18, the disc Ill is provided with an opening 19 extending therethrough and counterbored in the lower side of the disc til as shown at 20. Upwardly directed screw threaded bolts or studs 21 extend through the openings 19, and include square or polygonal heads 22, which are received by the counterbores 20, such counterbores being of the same shape as the heads 22 to prevent the studs 21 from turning. The upper screw-threaded ends of the studs 21 project a considerable distance above the top face of the disc 10, as shown. Winged nuts 23 are carried by the studs 21 above the disc lit, and the upper ends of the studs are scored or staked at 24 to prevent separation of the nuts 23 from the studs 21 during rotation of the disc.

Four L-shaped clamps or clips 25 are provided, and each of these clamps has an opening in its fiat horizontal portion 25 receiving a stud 21, as shown. Each stud 21 is arranged at the longitudinal center of the portion 26 of the clamp. The clamps 25 are loosely mounted upon the studs 21 prior to the tightening of the wing nuts 23. Each L-shaped clamp 25 further comprises a depending or vertical extension 27, integral therewith and projecting into the adjacent groove 18 and extending to the bottom of the groove. The extension 27 is slightly longer than the depth of the groove 18, so that when the nut 23 is turned downwardly into clamping engagement with the portion 26, the outer end portion of the clamp will remain elevated somewhat from the top surface of the disc :10, as clearly shown in Figures 2 and 3. The studs 21 are sulficiently long so that when the nuts 23 are loosened, the extensions 27 may be disengaged from the grooves in, thus permitting the clamps 25 to be turned upon the studs 21 to positions parallel with the grooves 113, as shown in Figure 5.

A square sheet 23 of sand paper, emery cloth or other suitable abrading material is used in conjunction with the octagonal disc ill. As shown in Figure 5, the disc it and associated elements is placed upon the sheet 28 of sand paper with the four corner portions 29 thereof arranged adjacent to the marginal edges 17 of the disc having the grooves 18. The nuts 23 are loosened, and the clamps 25 are turned to positions generally parallel with the grooves as shown in Figure 5. The corner portions 29 of the abrading sheet 28 are now folded upwardly and about the adjacent edges 17" of the disc and over the grooves 18, as best shown in Figure l. The clamps 25 are now returned to their positions shown in Figure 1, wherein the extensions 27 center the grooves 18 and engage upon the corner portions 29 of the sand paper. The winged nuts 23 are now tightened into clamping relation with the portions 26, and this forces the depending extensions 2.7 into clamping engagement with the corner portions of the sandpaper, which corner portions are now securely held by the extensions 27 against the bottoms of the grooves 18. The extreme corners or points of the portions 29 now underlie the clamp portions 26 as indi cated at 30. The arrangement provides for rendering the abrasive sheet 28 taut against the resilient pad 11; as the corner portions 29 are drawn downwardly into the grooves 18 by the clamps 25. Once the clamps are set, the abrading sheet 28 is securely held and cannot turn or slip relative to the disc 16. The marginal edges of the square sheet 28 may be flush with the marginal edges 17 of the disc between the grooves 18, as shown in Figure 5. The arrangement is neat in appearance and compact, and standard sizes of square sand paper sheets may be readily used. Obviously, it is a simple matter to remove or replace the abrasive sheet 28.

It is to be understood that the form of the invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size and arrangement of parts may be resorted to, without departing from the spirit of the invention or scope of the subjoined claims.

Having thus described my invention, I claim:

1. An abrading device comprising a polygonal disc, said disc being provided in one face and near and inwardly of marginal edge portions thereof with recesses, clamps carried by the disc adjacent to said recesses and including portions engagable within the recesses, means connected with the cl ps for forcing said portions of the clamps against the bottoms of the recesses, a polygonal abrading sheet to extend over the face of the disc remote from the clamps and recesses and having corner portions, said corner portions being foldable about the marginal edge portions of the disc adjacent the recesses and over the recesses so that the portions of the clamps which enter the recesses may force said corner portions into clamping engagement with the bottoms of the recesses, and means for attaching the disc to the spindle of a power tool or the like.

2. An abrading device comprising a polygonal disc, said disc being provided in one face thereof and near marginal edge portions of the same with grooves extending substantially parallel to said edge portions, screw threaded elements secured to the disc near and inwardly of said grooves, nuts mounted upon the screw-threaded elements, substantially L-shaped clamps connected with the screw threaded elements and having parts engagable within the grooves, a polygonal sheet of abrading material extending over the other face of the disc and having corner portions foldable about the marginal edges of the disc adjacent the grooves, said corner portions extending over the grooves and beneath said parts of the clamps which enter the grooves, and means for connecting the disc to a rotary power tool or the like.

3. An abrading device comprising a substantially rigid octagonal disc, said disc being provided in one face and near and inwardly of alternate marginal edge portions with grooves, screw-threaded studs secured to the disc inwardly of said grooves and extending above the disc, nuts carried by the screw-threaded studs, means for preventing the nuts from completely disengaging said studs, clamp elements connected with the studs between the disc and nuts and having parts engagable within the grooves and adapted to contact the bottoms of the grooves when the nuts are turned into engagement with the clamp elements, whereby the clamp elements may engage and clamp the corner portions of a rectangular abrading sheet within the grooves when the sheet is extended over the face of the disc remote from the grooves, and means for connecting the disc with a rotary element.

4. An abrading device comprising an octagonal disc, said disc being provided in one side and near and inwardly of alternate marginal edges of the disc with elongated grooves extending generally parallel with said marginal edges, said grooves being arcuate longitudinally and in transverse section, screw threaded elements carried by the disc near and inwardly of the grooves, nuts mounted upon the screw threaded elements, L-shaped clamps connected with the screw-threaded elements between the nuts and disc and being engagable within the grooves, a rectangular sheet of sand paper covering the other side of the disc and having corner portions foldable about the marginal edges of the disc adjacent the grooves, said corner portions extending across the grooves and under said clamps, whereby the clamps securely hold said corner portions against the bottoms of the grooves, and means for connecting the disc with a rotary element.

5. An abrading device comprising a disc, said disc having a plurality of substantially straight marginal edge portions, said disc being provided in one side thereof and near and inwardly of said straight marginal edge portions with a corresponding number of recesses, an abrading sheet having corner portions extending over the side of the disc remote from said recesses, said corner portions being foldable about the straight marginal edge portions of the disc into overlying relationship with the recesses in said one side of the disc, a plurality of separate clamping means connected with the disc near said recesses and having parts entering the recesses and forcing said corner portions of the abrading sheet into clamping engagement with the bottoms of the recesses, and means to support and drive the disc.

6. An abrading device comprising an octagonal disc having substantially straight edge portions and upper and lower faces, a substantially square abrading sheet folded at its corners to provide flap portions, said flap portions engaging against certain of the substantially straight edges and extending over the upper face, the edge portions of the abrading sheet between the folded flaps terminating substantially at the remaining substantially straight edge portions, and separate clamping devices mounted upon the upper face of the disc and engaging the flap portions to clamp them against said upper face.

References Cited in the file of this patent UNITED STATES PATENTS 528,024 Perry Oct. 23, 1894 577,860 Keighley Mar. 2, 1897 718,154 Pine Jan. 13, 1903 1,143,725 Reed June 22, 1915 1,353,966 Lorenz Sept. 28, 1920 2,127,703 Schwenke Aug. 23, 1938