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April 6, 1954 T. B. THOMAS ETAL 2,674,070 BELT SANDER Filed April 24, 1953 2 Sheets-Sheet l GS4 Sasayas INVENTORs 7 Aeo4ere A577 orzas W z zzz za ZAro to a B Y ATTORNEY April 6, 1954 T. B. THOMAS ETA 2,674,070 BELT SANDER Filed April 24, 1953 2 Sheets-Sheet 2 s NSNSNSAs4AA Yaaaaaaayaa Geese easy INVENTOR6 EsS Z/ze odore AZA or as Z2% FXX 88 a sasawawa %2. MeBY 722 z za za ZAre zo-ra. TTORNEY Patented Apr. 6, 1954 2,674,070 UNITED STATES PATENT OFFICE 2,674,070 BELT SANDER, Theodore B. Thomas and Virginia L. Brown, New London, Wis. Application April 24, 1953, Serial No. 350,966 8 Claims. 1. (C. 51-135) This invention relates to a novel form of belt 2 Sander and more particularly to a belt sander belt sander attachment in its entirety and com which is constructed to be utilized as a drill press prising the invention is designated generally 0 attachment utilizing the power furnished by the and includes an elongated base plate having a drill press for driving the sanding belt including narrow extension 2 constituting One end thereof a pulley Speed changer, which is conventional and which forms an extension of one side edge With drill presses, for varying the speed at which 3 of said base plate. the belt will be driven to thereby increase the Said narrow end 2 is provided with a pair of Versatility of the Sanding attachment. transversely spaced upwardly extending apertured Another object of the invention is to provide standards 4 to receive therebetween a portion of a belt sander including a drive pulley which is an elongated Supporting member 5 which is piv Separate from the remaining parts of the sander otally supported on said standards 4 by a pivot attachment and supported by a drill chuck where pin 6 which extends therethrough and through by endless sanding belts of different lengths may a portion of the support 5, for rocking movement be interchangeably employed with the sander at of Said Support in a vertical plane. A Substan tachment. 3 tially Semicircular end table 7 has a slotted bar A further object of the invention is to pro f8 fixed to and depending from an underside vide a Sander attachment which readily adapts thereof. A bolt of a bolt and wing nut fastening itself for sanding and dressing curved edges of extends through the slot of the bar 8 and different radii and which may also be employed through the outer end 20 of the rocking support for Sanding and dressing other portions of work 3 5 to detachably and adjustably mount the table pieces including corners of edges thereof, such thereon. as moldings. The rocking support 5 is provided with an Another object of the invention is to provide antifriction bearing 2 f, as best illustrated in a Sander attachment wherein tightening of the Figure 7, which is mounted therein between the Sander belt may be readily accomplished by mere pivot 6 and its outer end 20 and in which is ly shifting a supporting bedplate of the attach journalled the lower end of a small diameter ment relatively to a drill press table to which belt spindle 22 which rises substantially perpen the bedplate is clamped. dicularly from said support 5. A manually ad Other objects and advantages of the invention justable screw 23 is threaded downwardly through Will hereinafter become more fully apparent from 3) an inner end 24 of the support 15, inwardly of the the following description of the drawings, illus pivot 6, and has a lower end which rests nor trating a presently preferred embodiment thereof, mally upon a part of the bedplate portion 2 to and Wherein: limit rocking movement of the support 5 in a Figure 1 is a side elevational view, partly in clockwise direction as seen in Figure 1. Section, showing the belt sander attachment in an The inner straight edge of the end table T is operative position connected to a conventional provided intermediate of its ends with a notch change speed drill press; 25 which is disposed around the spindle 22. Figure 2 is a top plan view of the sander at The bedplate f has a supporting post 26 fixed tachment taken substantially along a plane a to and rising therefrom adjacent its side edge f3 40 and remote to the narrow bedplate end 2. The indicated by the line 2-2 of Figure : post 28 has flat sides disposed transversely of Figures 3 and 4 are enlarged cross sectional the bedplate if and has a bolt and wing nut views taken Substantially along planes as indi fastening 27 extending therethrough. An elon ofcated Figure by 1;the lines 3-3 and 4-5, respectively, gated side table 28 has a slotted bar 29 fixed to Figure 5 is a central sectional view, partly and depending therefrom and disposed substan in elevation, taken through the larger drive spin tially intermediate of the ends thereof. The bar dle of the sander attachment; 29 extends downwardly on one side of the post Figure 6 is a fragmentary vertical sectional 26 and the bolt of the fastening 27 extends there view of a portion of the backing plate and the through for adjustably securing the bar 29 to mounting thereof; and Said post for supporting the side table 28 there Figure 7 is an enlarged fragmentary cross sec above. tional view taken Substantially along a plane as A back or backing plate 30 has a pair of legs 3. secured to an inner or back side thereof by indicated by the line 7-7 of Figure 1. fastenings 32. The legs 3 extend downwardly Referring more specifically to the drawings, the from a bottom edge of the backing plate 30 and 2,674,070 4. 3 ii. The peripheries of both spindles or pulleys terminate in right angularly turned iongitudi may be provided with a suitable non-slip coating, nally slotted foot portions 33 which extend away as indicated at 48 in Figure 5 in reference to the from the plane of the backing plate 38 and which Spindle 4. Likewise, the diameters of the rest on the base plate . Screw fasteniags 34 Spindles can be increased by securing a sleeve extend loosely through the slots or foot members thereafound, such as illustrated in Figure 7 by 33 and threadedly engage in the base plate it the sleeve 49 applied to the spindle 22. for Securing the backing plate 3 above said base From the foregoing it will be readily apparent plate and in a vertical plane, and Substantially that the belt AG will be driven when the drill longitudinally of the base plate. An outer face chuck 65 is revolved at different speeds depend 35 of the backing plate 3) is spaced from the ad iing upon the speed of rotation of said drill chuck jacent inner edge 36 of the side table 28. Said and as variably controlled by the conventional outer face 35 is shown provided with one groove Speed change pulleys of the drill press. The end 3. Which extends fron end-to-end thereof; now table may be utilized to suport a workpiece for ever, the face 35 may be provided with one or is detailed Sanding and finishing a rounded portion more grooves of different croSS Sectional sizes and Cf Small radii, by utilizing the portion of the belt Shapes, ior a purpose which Will hereinafter be (8 passing around the small spindle 22. By apparent. loosening the fastening 9 the table 7 may be All of the parts previously described are di tilted at different angles for supporting a work rectly or indii'ectly supported by the base plate giece, not shown, for angle sanding and dressing. if. The wide end of Said base plate, which is lo cated reinote to the arrow end portion 2 there Likewise, the side table 28 can be employed as of, is adapted to rest or a portion of a table 38 a rest for a Workpiece for edge S2nding utilizing of a conventional cinainge speed drill press, a the portion of the reach or flight of the belt 46 portion of which is illustrated at 39. Said base Which is passing across the outer face 35 of the 25 sacking plate 38, said backing plate preventing plate portion is secured to the drill press table said belt, reach from yielding in Wardly and away 38 by a conventional clamp 6), adjacent the ionin the workpiece. Likewise, the table 28 inay edge of the base plate which is located remote le aligularly adjusted for Supporting a workpiece to Said aforeilientioned edge 3. A relatively large drive spindle or pulley 4, for angle Sanding and dressing to various shapes. 30 Also, detailed Sanding and dressing Such as of a diameter Substantially greatei' than that of irounded corners of edges and faces of a Workpiece the Spindle 23, has an intermediate portion of a inay be accomplished where the workpiece is shaft or stem 42 extending centrally there Supported on the table 28 and said table is em through and Secured therein. As best seen in ployed in conjunction with the groove 37 which Figure 5, the ends of the shaft or stem 42 extend penits a portion of the belt fight or reach to from the ends of the spindle or pulley 4. One yield inwardly, for irounding off corners and edges shaft end A3 is larger than the other shaft end of the workpiece.