Dec. 24, 1946. T, |_, BONKQWSK] 2,413,165 `SHIELD FOR SANDING DRUM SLOTS Filed April 24, 1945 INVENTOR: \-> *1ro .3 TEOF IL L. BONKOWSKI .awww/Pfff@ AGENT Patented Dec. 24,1946 2,413,165 UNITED STATES PATENT OFFICE 2,413,165> l , SHIELD FUR SANDING DRUM SLOTS Teoíil L. Bonkowski, Los Angeles, Calif. Application April 24, 1945, Serial No. 590,025 2 Claims. (Cl. 51-194) l 2 This invention relates to rotating shaft mounted drums or wheels for the sanding of wooden, plastic, metal and other articles whose spective said shields in said edge-protecting surfaces have narrowly recessed sections more or shield and certain shield-retaining means, as seen less inaccessible to ordinary sanding means, the drum containing a plurality of flexible sanding or abrasive strips of cloth, paper or otherwise, the free or working ends of the strips protruding out in the plane 4_4 in Figure 1. Referring to Figures 1 and 2, the respective sanding drum is indicated by I ll. The main body thereof is constituted of a base plate II, secured to a rotating shaft, not shown, by a hub I2, and integral with a peripheral Wall I3, which may be of circular cross-sectional form or of any other symmetrical form. The axis of symmetry of the drum, which is also the aXis of rotation thereof, is indicated by S-S. A detachable cover for the 15 drum is indicated by I4, side of the peripheral wall of the drum or wheel and respectively thru a corresponding plurality of slots, each of said free ends being generally stili" ened or backed by a thereto respective, adjacent one of a corresponding plurality of stiffening means, generally small brushes. Sanding strips are coated only on one side with means. Figure 4 is an enlarged sectional View of said thereto bonded grains of abrasive material. The coated side therefore of the working end exercises an abrading effect on the coated-side-confronting edge of the respective slot. Since a longer life successively spaced around the drum in periph eral wall I3, is a plurality of strip-slots or open ings or, simply, slots, I5, I6, Il, I8, I9, 2U, 2| and 22. Corresponding to them respectively are the of the drum or wheel is a desideratum and since 20 shields, 23, 24 25, 26, 21, 28, 29 and 30, which are the body of the drum or wheel is preferably of a soft metal or plastic to permit ease and economy conceivably of spring steel and which are adapted to embrace and ’be retained by the coated-side of fabricating it, this invention concerns itself particularly with special protecting means for confronting edges respectively of said slots in the abrading of said coated-side-confronting edge cated by 3I, 32, 33, 34, 35, 36, 31'and 38. order given. The free or working ends of the eliminating the otherwise more or less serious 25 thereto respective said sanding strips are indi and the thereupon consequent premature con In. Figure 3, the disposition of the abrasive- or sumption of the drum. No means for this purpose coated-side-confronting edge of the respective have ever been employed before on sanding said strip slot is indicated by the plane G-G. drums. The combination therefore of a drum 30 Referring to Figure 4, one of saidshields, 23, is with such means constitutes the basic object and shown embracing and being retained by the re advantage of this invention, in which a certain ' spective said co-ated-side-confronting edge I5A of replaceable shield constitutes one of the elements slot I5, which edge is provided with a therein thereof. molded or cast bead I5B, which permits one, when A subsidiary object and advantage is quick and the cover I4 is removed for the purpose, to slip facile replaceability of said shield. the shield 23 axially parallelwise onto said edge A further object and advantage is a guarantee IEA and, yet, because of the locking disposition against the accidental dislodgement of said shield of bead IEB within the arced section 23A of the while the drum is in use. shield, bead I5B restrains any appreciable move Although there are many arrangements of 40 ment of shield 23 toward the opposed, other edge of slot I5, with the thereupon ensuing obstruction edge-protecting means based on the principles of of the slot. AXially parallel displacement of shield 23 is prevented by cover I 4. The described rela tionship between the bead or shield-retaining means, I5B, and the arced section 23A constitutes said previously mentioned guarantee against the this invention that will be conceived by persons skilled in the art, I prefer to select a simple and typical one of them as illustrative of said princi ples and constituting therefore the subject of this speciñcation and of the herewith accompanying drawing, in which accident-al dislodgment of said shield.` Figure 1 is a plan view of a drum embodying said selected arrangement of edge-protecting tively provided wlth the two mutually coacting parts, namely, bead IEB and arced section 23A, means. Said slot I 5 and the shield are therefore respec 50 which are adapted to permit the drum-axially parallel removal and installation of the shield from the side thereof that is opposed to the shaft from and in said drum and to restrain ‘displace mounted side. ment of the shield toward the other ofthe two Figure 3 is an enlarged view of one of the re 55 edges of the slot. The above applies of course to Figure 2 is an elevation view of the same as seen 2,413,165 each combination of slot and shield among said slots and shields. In Figure 4, the arced section 23A is schematically represented as being larger than the bead by a greater amount than is ac tually the case in practice. The space defined by the arced section, in which the bead is received, is in practice somewhat smaller. I claim: 1. In a sanding drum, the combination of a drum having a peripheral Wall formed with a 10 plurality of spaced slots, one long edge of said slots being formed with a bead therealong and a shield removably ñtted over each said long edge 4 and bead, and said shield having an enlarged por tion to receive the beaded edge of the drum, and parallel leg sections embracing the peripheral Wall beyond the bead. 2. In a sanding drum, the combination of a drum having a peripheral wall formed with a plu rality of slots spaced therearound through which abrasive strips are extended, a peripheral wall along one long edge of each slot being beaded, and removable wear clips passed over the peripheral Wall and over beaded edges thereof and being held to the peripheral Wall behind said beads. TEOFIL L. BONKOWSKI.