US2676439A

US2676439A - Rotary sander

Info

Publication number: US2676439A
Application number: US299723A
Authority: US
Inventors: Baker Dan Dysart
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-07-18
Filing date: 1952-07-18
Publication date: 1954-04-27
Anticipated expiration: 1971-04-27

Description

D. D. BAKER ROTARY SANDER April 27, 1954 Filed July 18, 1952 INVENTOR Dan 0 Baker BY M r%m ATTORN E YS Patented Apr. 27, 1954 UNITED STATES PATENT OFFICE I 2,676,439 ROTARY SANDER Dan Dysart Baker, New Orleans, La. Application July 18, 1952, Serial No. 299,723

6 Claims.

N This invention relates to a sander and more particularly to arotary sander which ismounted in cooperating relation to a table and is used for sanding edge faces of boards or side faces of timbers or the like.

When a sander of this type is in use, a board or the like is placed upon a table and moved lengthwise at an angle so that it progressively moves beyond the side of the table at which the rotary sander is mounted. During this movement the edge face of the board presented toward the rotary sander moves across a beveled edge face of the sander, thus causing this edge face of the board to be sanded and thus a smooth surface is produced. The sander must be provided with an abrading surface which is best suited to the type of wood being treated and it is, therefore, one object of the invention to provide a rotary sander wherein a disk is firmly mounted upon a rotatably mounted shaft and carries a ring which is firmly secured about the peripheral edge portion of the disk to turn therewith, the ring having a beveled edge face upon which a strip of sand paper or the like is mounted, but may be removed when it is worn to such an extent that replacement of the sand paper is necessary.

It is another object of the invention to provide a rotary sander wherein the disk carries a ring of such construction that it may be easily mounted about the disk and firmly but detachably secured thereto and thus allow a ring having a beveled edgeface of predetermined angle to be removed and another ring applied having a beveled edge face at an angle different from that of the ring previously used.

Another object of the invention is to provide a sander wherein the axis of the rotatably mounted shaft is disposed in such a horizontal plane that this axis will be midway the thickness of the board being operated upon and thus cause the beveled edge face of the ring to move in such a direction relative to the board that the edge face of the board will be sanded and smoothed without leaving'marks which will disfigure the surface of the board.

Another object of the invention is to provide a ring which is split along a radially extending plane through its circumference, thus providing a unitary ring which may be constricted about a disk to which the ring is applied and be very firmly held in .gripping engagement with the disk.

'Another object of the invention is to provide a ring which may be formed either of solid metal or of sheet metal and in each case consists of a splitring carrying ears projecting from the ring at opposite sides of the split and carrying a bolt by means of which force is exerted to constrict the ring about the disk upon which it is mounted.

It is another object of the invention to provide a sander having a novel beveled edge face covered with an abrasive material serving to impart a smooth surface to a confronting edge face of a board or the like moved longitudinally in crossing relation to the said edge face of the sander.

With these and other objects in view the invention consists of an improved construction and arrangement of parts illustrated in the accompanying drawings wherein:

Fig. lis a top plan view showing the rotary sander disposed at one side of a table and a board resting upon the table with a portion of the board projecting from a side thereof and across the beveled edge face of the sander;

Fig. 2 is a view showing the rotary sander in elevation and the shaft upon which it is mounted in transverse section;

Fig. 3 is 'a sectional view taken vertically through the sander along the line 33 of Fig. 2;

Fig. 4 is a perspective view of the rotary sander with a portion thereof broken away;

Fig. 5 is a perspective view showing a portion of a ring which is formed of sheet metal instead of solid metal;

Fig. dis a perspective view showing a rotary sander wherein a ring is omitted and a strip of sand paper or the like applied to a beveled edge face of the sander.

The sanding apparatus shown in Fig. 1 includes a table .I which is generally of the type shown in Patent 2,068,964, issued January 26, 1937. This table has a flat top across which extend metal channel. bars 2 which are countersunk in the table and between which is mounted a plate 3 formedwith an elongated opening 4 through which is exposed a slot 5 for reception of a rotary saw. This saw, which is not shown, is mounted under the table top in a conventional manner in order that it may be moved vertically through the slot 5 into and out of position for use, and it will be understood that when the table is used for-sanding, the saw blade is removed.

Strips 6 extend along opposite edges of the table top at which the metal strips 2 terminate and upon one of these strips or tracks 6 is mounted a block -1 which is shiftable along the track to adjusted positions. A work guide 8 is pivotally connected with the block 7 by. a fastener 9 in order that the work guide may be swung about its pivotal mounting to an angularly adjusted 3 position where it is releasably secured by a fastener In which may be a set screw or the like.

Adjacent one side of the table is a rotary sander H carried by a shaft l2 which is rotatably mounted through a suitable number of bearings l3 each of which has a depending shank l4 connected with a supportin standard H). In Fig. 3, the shank 14 of the bearing l3 has been shown formed with a longitudinally extending slot 16 through which a bolt I1 passes in order that the bearing may be vertically adjusted and the longitudinal axis of this shaft disposed in a horizontal plane which will dispose the axis of the rotary sander above the the board It that the said axis of the shaft will be midway the thickness of the board, as clearly shown in Fig. 2. This board rests upon thetable with an edge face of the board presented towards and in fiat contacting engagement with a side face of the work guide 8 and as the board is moved longitudinally of the work guide it progressively moves across the edge face of the rotary sander and its side edge face which confronts the work guide will be acted upon by the sander and this edge face of the board sanded in such a manner that the surface will be very smooth.

When a board is, pushed forwardly along the table and across the beveled edge face of the sander it progressively moves the table and its portion projecting from the table will be liable to sag and tip the board vertically and out of accurate engagement with the wheel. This may be prevented by placing an auxiliary table in position to receive the forwardly projecting portion of the board or by provision of a shelf (not shown) extending diagonally from the table top and supported from the table by a suitable mounting such as a bar extending transversely across connected with the strip or track at the other side of the table from the track 6 with which the rip fence 8 is connected.

The rotary sander consists of a circular disk l9 which is of an even thickness throughout its area and at its center formed with a rearwardly projecting bossor hub 29 through which is formed a bore or opening 2| to snugly receive the reduced forward end portion 22 of the rotatable. shaft l2. After the disk has been, applied to the shaft a set screw 23 mounted in a radially extending threaded opening 24 formed in the hub or boss is tightened and the disk willthus be firmly secured to the shaft and turn with the shaft.

A ring 25 fits about the disk and is firmly secured so that it has frictional gripping engagement with the disk and turns with the disk. This ring may be a solid ring formed of resilient metal or. other suitable material and at one point about its circumference the ring is slit as shown at 26 so that. the ends of the ring are spaced from each other a slight distance, as shown in- Fig. 2.

A recess 21 is formed about the inner marginal portion of the ring and is of such dimensions that the disk will fit snugly therein.

Ears

28 and 29. project. rearwardly from the ring at. opposite sides, of the slit 26' and one of these cars is formed with a threaded opening 30; while the other is formed with an opening 3| which is unthreaded. Therefore, after the ring has been applied about the disk a securing; screw 32 may be passed, through the. unthreaded opening 31 and screwed into the threaded opening 30- until the ends of the ring are drawn towards each other to such an extent that the ring will be tightly table in such relation toforwardly beyond the rear end of the shelf and 4 clamped about the disk. The outer marginal edge face 33 of the ring is beveled for its full width and against this beveled edge face of the ring is mounted a strip 34 having its outer surface coated with an abrasive material which may be sand, emery, or the like. The angle of the beveled surface of the ring may be any angle desired, such for instance, as an angle of 20 or 45, and it will be understood that the rings may be made in sets each of which has its beveled edge face at a different angle from other rings of the set. Therefore, a person usin the sander may select a ring having its edge face at a desired angle and by setting the work guide so that it extends at the same angle as the edge face of the ring, a board placed against the rip fence and slid longitudinally across the edge face of the rotary sander will move, at such an angle that it conforms to the angle of the rotary sander, and as the board moves across the rotary sander the sanding action will be diagonally of the board and produce a very smooth surface.

Instead of forming the ring of solid resilient metal or other suitable material, it may be formed of sheet metal. Such a ring is illustrated in Fig. 5. This ring is preferably formed from a single blank of sheet metal, but it may be made from two or more pieces welded or otherwise secured together. It has a circular rear wall 35 and from the outer peripheral edge of this rear wall extends a diagonally disposed outer marginal wall 36 corresponding to the diagonally extending edge face of the ring 25. An annular flange 31 extends from the marginal wall 36 towards the rear wall 35 and carries a wall portion 38 which cooperates with it to form a recess 39 correspond.- ing to the recess 21. About the inner marginal edge of the rear wall 35 the sheet metal is bent to form a narrow circumferentially extending inner edge face or marginal wall 49 which in its turn is bent to form a flange 41 to which the wall portion 38 is welded or otherwise firmly secured. The sheet metal ring thus conforms to the shape of the solid metal ring and has its ends spaced from each other to provide a slit 42 corresponding to the slit 25. Tongues 43 which are integral with the rear wall 35 are bent so that they extend rearwardly from the rear wall at. opposite sides of the slit 42, and. through these tongues or cars 43 are formed aligned openings 44 to receive a bolt 45 carrying a nut 46. By tightening the nut 46 the ring will be constricted about the disk about which it is disposed and have firm gripping engagement with the disk.

In. Fig. 6 there has been shown an embodiment of the invention wherein a disk 47 is formed at its center with a rearwardly extending hub 43 through which a bore or opening 19 is formed to receive the reduced end portion 22 of the shaft l2. A set, screw 5.?! is threaded into the hub radially thereof and after the disk has been appliedto the shaft the set screw is tightened. to firmly hold the disk upon the shaft. This disk corresponds in diameter to the diameter of. the ring which is mounted about the disk 19' and has abevelededge face 5! upon which is mounted astrip. 52 having its outer surface coated with sand, emery, or any other suitable abrasive material.

I claim:

1. A rotary sander comprising a rotatable shaft, a. circular disk of an even thickness throughout its area, a central boss carried by said disk and extending rearwardly therefrom, said bos being formed with a'center' bore passing through the disk and with a threaded side opening, said disk being mounted upon said shaft with the shaft fitting snugly in the bore and firmly held therein by a set screw mounted in the threaded opening, a ring about said disk split transversely at a plane through its circumference and at its end carrying rearwardly projecting ears formed with aligned openings, the opening in one ear being threaded and the opening in the other ear unthreaded, an adjusting screw passing freely through the unthreaded opening and engaged with the threads of the threaded opening, said ring having its inner marginal portion formed with a circumferentially extending recess constituting a seat into which the marginal portion of the disk snugly fit and is firmly held by tightening the adjusting screw, said ring having a sloping peripheral edge face extending at an incline the full distance between front and rear sides of the ring, and abrading material covering the entire sloping edge face of said ring.

2. A rotary sander comprising a circular disk of even thickness throughout its area and having at it center a socket for receiving a rotatable shaft and thereby mounting the disk upon the shaft to turn therewith, a resilient split ring fitting about the circumference of said disk and having spaced ends carrying cars, a fastener carried by said ears and holding the ring constricted about the disk in tight gripping engagement therewith, said ring being formed about its innner periphery with a continuous recess open along the front and inner side edge faces of the ring and constituting an annular seat into which marginal portions of the disk fit, said ring having a transversely sloping outwardly peripheral edge face, and abrasive material covering the said peripheral edge face of said ring.

3. A sander comprising a ring of dimensions adapting it to fit about a circular disk of predatermined diameter adapted to be mounted upon a rotatable shaft, said ring being split at a point about its circumference and formed of resilient sheet material and having a flat circular rear wall, a sloping outer peripheral wall extending forwardly from the outer marginal edge of the rear wall at an inward incline, a short inner peripheral wall extending forwardly f om the inner marginal edge of the rear wall and of appreciably less depth than the outer peripheral wall, a front wall disposed in spaced parallel relation to said rear wall and about its inner marginal edge being connected with the front edge of the inner peripheral wall, an annular shoulder extending between the front edge of the sloping outer peripheral wall to the outer marginal edge of the front wall and together with the said front wall defining an annular disk-receiving recess, perforated ears extending rearwardly from ends of the rear wall at opposite sides of the split in the ring, and a fastener passing through the perforated ears and serving to contract the ring into binding engagement about a disk seated in the rece s when tightened.

4. In a sanding apparatus, a table having a top, a rotatable shaft spaced from a side edge of the table top and disposed at right angles to the said side of the table top, a track extending along a side edge of the table top at right angles to the said side edge of the table top, a rotary sander mounted upon said shaft at the end thereof adjacent the first mentioned side edge of the table top and having a beveled peripheral edge face sloping towards the table, and a work guide shiftable along said track towards and away from the first mentioned side edge of the table top to adjusted positions and extending across the table top and pivotally mounted for movement to a position in which it extends parallel to the transverse slope of the said beveled edge face of the rotary sander.

5. In a sanding apparatus, a table having a flat top, a rotatable shaft spaced from a side edge of the table and disposed at right angles to the said side edge of the table and shiftable vertically to a position in a horizontal plane above the plane of the upper surface of the table top a distance corresponding to one-half the thickness of a board to be sanded, a rotary grinder carried by said shaft at the end thereof presented towards the table and having a beveled peripheral edge face constituting a grinding surface, and a work guide shiftable along the upper face of the table top towards and away from the said side edge thereof to adjusted positions and pivotally mounted for horizontal swinging movements to an angularly adjusted position disposing it parallel to the transverse incline of the beveled edge face of the rotary grinder.

6. A rotary sander comprising a rotatable shaft, a circular disk of an even thickness throughout its area mounted upon and turning with said shaft, a ring about said disk split transversely at a plane through its circumference and at its ends carrying rearwardly projecting ears formed with aligned openings, an adjustable fastener passing through said openings and tightened to draw the ears towards each other and contract the ring about said disk in tight gripping engagement therewith, said ring having its inner peripheral portion formed with a circumferentially extending recess constituting a seat in which marginal portions of the disk fit and are firmly held by frictional grip of the ring, said ring having a radially sloping peripheral edge face extending at an incline the full thickness of the ring, and abrading material covering the sloping edge face of said ring.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,193,525 Dosch Aug. 8, 1916 1,288,561 Gouldbourn Dec. 24, 1918 1,292,372 Reisch et al Jan. 21, 1919 1,929,960 Teebe Oct. 10, 1933 1,965,707 Levoy July 10, 1934 2,483,369 Louoony et a1. Sept. 27, 1949