US 4,720,940 A · Rotary drum sander

Abstract

A drum sander (10) for woodworking which may be used in combination with a radial arm saw (25). The drum sander (10) includes a horizontal, rotatable sanding cylinder (31) which is supported above a work table (20). The wood (not shown) to be sanded is inserted beneath the sanding cylinder (31) on top of the work table (22). The sanding cylinder is supported, in two different embodiments, by either one (17) or two (17 and 55) vertical supports. The sanding cylinder (31) is also supported, in two different embodiments, by either a horizontal carriage arm (11) or a carrier bracket (52). The drum sander (10) also includes a slide fastener (34) which attaches the sandpaper strips (60) onto the sanding cylinder (31). Also disclosed is a removable dust collector (16) which covers the upper portion of the sanding cylinder (31) and is connected to the hose (49) of a vacuum.

Claims16

Dependent claims

A drum sander accessory for radial arm saws of the type having a vertical adjustable column supporting a horizontal saw arm which is parallel to a horizontal work table and having a motor with a drive shaft, comprising:

(a) a sanding cylinder substantially parallel to and spaced above said work table, having an inside and outside, and having a first end proximate said vertical column and an opposite second end, the outside of said cylinder having an abrasive strip thereon and the inside of said cylinder having a central shaft extending therethrough and beyond each end of said sanding cylinder;
(b) two vertical carriage legs attached to and extending above each end of said sanding cylinder, said vertical carriage legs each having an aperture to accommodate said central shaft;
(c) a substantially horizontal carriage arm spaced above said sanding cylinder, having a first and second end corresponding to said first and second end on said sanding cylinder, connected on each end to said vertical carriage legs;
(d) a clamp rigidly connected to said first end of said carriage arm which is clamped onto said vertical column for vertical adjustment and tightening of said sanding cylinder;
(e) a driven pulley having a central bore through which said first end of said central shaft is inserted;
and
(f) an arbor drive pulley connected to said drive shaft of said radial arm saw and connected to said driven pulley by means of a belt, whereby said sanding cylinder is rotated and wood is sanded when inserted beneath said sanding cylinder.

4 more elements

(a) a sanding cylinder substantially parallel to and spaced above said work table, having a first end proximate said vertical colummn of said radial arm saw and an opposite second end, said cylinder having an abrasive strip thereon and a central shaft extending therethrough and beyond each end of said sanding cylinder;
(b) a U-shaped carrier bracket having a first and second vertical end corresponding to said first and second ends on said sanding cylinder, with an integral horizontal member between said vertical ends, each vertical end of said bracket having an aperture to accommodate said central shaft;
(c) a column support rigidly attached to said work table and connected to said second vertical end of said carrier bracket for support thereof, said column support having an annular collar with a locking knob and set screw which surrounds said column support, whereby said second end of said sanding cylinder can be adjusted vertically and tightened into the desired position by said locking knob;
(d) a sleeve member connected to said first end of said carrier bracket proximate said horizontal member which is clamped onto said vertical adjustable saw column for vertical adjustment of said first end of said sanding cylinder;
(e) a driven pulley having a central bore through which said frist end of said central shaft is inserted;
and
(f) an arbor drive pulley connected to said drive shaft of said radial arm saw and connected to said driven pulley by means of a belt, whereby said sanding cylinder is rotated and wood is sanded when inserted beneath said sanding cylinder.

4 more elements

(a) an aluminum sanding cylinder substantially parallel to and spaced above said work table, having an inside and outside, and having a first end proximate said vertical column and an opposite second end, the outside of said cylinder having an abrasive sandpaper strip spiralled thereon and the inside of said cylinder having a central shaft extending therethrough and beyond each end of said sanding cylinder;
(b) two aluminum vertical carriage legs attached to and extending above each end of said sanding cylinder, said vertical carriage legs each having an aperture to accommodate said central shaft;
(c) an aluminum, substantially horizontal carriage arm spaced above said sanding cylinder, having a first and second end corresponding to said first and second end on said sanding cylinder, connected on each end to said vertical carriage legs;
(d) a clamp rigidly connected to said carriage arm and clamped onto said vertical column for vertical adjustment and tightening of said sanding cylinder, having a first end proximate said carriage arm and an opposite second end, comprising:
(i) a clamp support piece integral with said carriage arm, said clamp support piece having a substantially semicircular clamping surface disposed proximate said second end;
(ii) a clamp screw having a clamp screw handle;
and
(iii) a clamp jaw having a substantially semicircular clamping surface oppositely facing said clamping surface of said clamp support piece, said first end of said clamp jaw having a transverse threaded bore through which said clamp screw is inserted, wherein the rotation of said clamp screw handle causes said clamp jaw to move relative to said clamp support piece to allow vertical adjustment and tightening of said clamp and attached drum sander;
(e) an attachment mechanism for attaching sandpaper to said sanding cylinder, comprising:
(i) a sandpaper feed groove formed in an end of said sanding cylinder parallel to the axis of said sanding cylinder;
(ii) a rivet disposes proximate said sandpaper feed groove having a rivet head on said inside of said sanding cylinder;
(iii) a slide fastener having a longitudinal slot, held against said inside wall of said sanding cylinder by said rivet head, said longitudinal slot being substantially perpendicular to the axis of said sanding cylinder, wherein said slide fastener slides along said rivet head for the length of said slot, so that when said rivet head is at one end of said slot, said slide fastener covers said sandpaper feed groove and is in its holding position, and when said rivet head is at the opposite end of said slot, said slide fastener does not cover said sandpaper feed groove and is in its release position;
(f) a driven pulley having a central bore through which said first end of said central shaft is inserted;
and
(g) an arbor drive pulley connected to said drive shaft of said radial arm saw and connected to said driven pulley by means of a belt, whereby said sanding cylinder is rotated and wood is sanded when inserted beneath said sanding cylinder.

12 more elements

Dependencies are inferred from the claim text.

Rotary drum sander

Life of this patent

Rotary drum sander

Life of this patent

Abstract

Claims16