US 2626489 A
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Description (OCR text may contain errors)
Jan. 27, 1953 R. G. THOMPSON 2,626,489-
SANDING BLOCK CONSTRUCTIQN Filed June 19, 1948 .F/QZ jiaflm @Mm-Euv2 Patented Jan. 27, 1953 UNITED STATES PATENT OFFICE 2,626,489 SANDING BLOCK CONSTRUCTION Richard G. Thompson, Stillwater, Minn. 1 Application June 19, 1948, Serial No. 34,032
4 Claims. (Cl. 51-186) My invention relates to an improvement in sand paper block and deals particularly with a support for sheets of sand paper for use in sanding operations.
' In the smoothing of various objects with sand paper, it is usually desirable that the paper he held on a flat plane during use. Various devices have been supplied for clamping sheets of sand paper to a block or similar support. These means have usually been costly to manufacture or unhandy to use. Furthermore, such devices usually require sand paper sheets of a, predetermined size and shape and it is necessary to cut the sand paper to proper shape before the same can be used.
The object of the present invention lies in the provision of a support for sheets of sand paper or similar abrasive material which can be produced at low cost and which supports a series of sheets of sand paper. When a sheet of sand paper has become worn this sheet may be readily removed and the next adjacent layer of sand paper used. When all of the sand paper of the block has been used, the block may be discarded and a new block used.
A feature of the present invention lies in the provision of a sanding block having a substantial supply of sand paper thereon, the sheets of which may be consecutively used and the block discarded after use. The user need only remove the sheets from the support when the sheets have become worn.
An added feature of the present invention lies in the provision of an elongated block having substantially parallel ends and in securing the sand paper sheets to the block by bending the sheets about the corners of the block between the bottom surface and the ends and adhering the sheets along the end walls of the block. As a result the adhesive used in securing the sheets together does not damage the. portion of the sand paper to be used and the bending of the sheets about the corner provides an effective means of anchoring the sheets in place.
An added feature of the present invention lies in the provision of a plurality of superposed sheets of abrasive material secured together along lines of adhesive which may be spaced from one edge of the sheets. The projecting edges of the sheets thus project beyond the adhesive and pref erably beyond the adjacent portion of th block so that the individual sheets may be readily grasped by the fingers for removing the same.
An added feature of the present invention lies in the provision of a sanding block which may if desired be provided on opposite surfaces with sand paper of different particle size. A- relatively course sand paper or abrasive sheet may be applied to one surface'of the block and a finer sand paper may be attached to the opposite side, thus making the block useful for many purposes and permitting a rough sanding operation and a smooth sanding operation'to be accomplished with the same device.
An added feature of the present invention lies in the fact that the surfaces on opposite sides of the block, may, if desired be off-set one from the other so that the'free unattached ends of the sand paper sheets may be readily accessible. This is accomplished by either notching opposite ends of the block on opposite surfaces thereof or else by attaching two blocks together in off-set rela tion'.
These and other objects and'novel features of my invention will be more clearly and fully set forth in the following specification and claims.
In the drawings forming a, part of my specification:
Figure 1 is a perspective view'of my sanding block showing the constructionthereof.
Figure 2 is a side elevational View of the same. 7 The block A is extremely simple in construction. The block includes/an elongated block body 10 of suitable" size or dimensions. The block'lfl is provided with opposed parallel surfaces l l and I2; One end l3 of the block l0 is notched as indicated at M. The notch l4 communicates both with the end l3 of the block and also the surface I2 thereof and in effect forms a projecting lip I5 adjoining the block surface H which projects beyond the opposite surface l2 of the block.
A similar shoulder I6 is formed in the diagonally opposite corner of the block at the junc ture between the end wall I! and the block surface I I.-'This notch l6 shortens the surface II and forms aprojecting lip l9 adjacent the block surface 7 I2. Thus a step is provided atopposite ends of the block for a purpose which will be later described in detail.
In the foregoing description, I have described the block It) as being formed of a single piece of material. The same construction may be easily produced by attaching together two blocks of onehalf the thickness of the block l0. Such a construction is illustrated in Figure 2 of the drawings, the block it being shown composed of two blocks 20 and 2| which are off-set one from the other to form the projecting lips l5 and I9.
The transverse juncture between the surface II and the end wall [3 is rounded as indicated at 22 and the juncture between the surface H and the wall 23 of the notch I6 is similarly rounded as indicated at 24. The juncture between the end wall I! and the block surface 12 is also rounded as indicated at 25 and the juncture between the surface l2 and the wall 26 of the notch I4 is also rounded as indicated at 21.
A series of sheets of sand paper or other suitable material indicated by the numeral 29 overlie the surface I l of the block I 0. One end 30 of the innermost sheet of the series is adhered to'the wall 23 of the block by adhesive 38. The strip of adhesive is provided at the extremity of the sheet and adheres the innermost sheet to thesblock.
The next layer of material is adhered by a'simi body having a'pair of parallel bearing surfaces, a
lar strip 38 of adhesive to the innermost sheet. 7
and similarly the ends 30 of all of adhered to each other.
The other ends 3! of the sheets 29 are adhered by a strip of adhesive 32 to the end wall l3 of the block, and the next, successive sheets are adhered to each other by similar strips of ad hesive. The "adhesive strips 32 arespaced from the extremities 3| of the sheet so that'a free unadhered end preferably extends beyond the notched wall I 3 as indicated in .the drawings; Theend 3| of each sheet may be engaged'by the fingers and the outermost sheet may be readily stripped from the remaining sheets as indicated by the curved outermost sheet illustrated in the drawings. In a similar manner a seriesof superposed sheets 33 of sand paper or other suitable material overlie the block surface l2, one end 34 of each sheet. extending over" the curved juncture 21 and overlying the end wall 26. A strip' of adhesive 35 is provided between each sheet and the next lower sheet and also between the innermost sheet and the wall 26. Thus one end 34 of each sheet is anchored firmly tothe block.
The other ends 36 of the sheets 33 are folded about the rounded juncture 25 to overlie theend wall I! of the block. "Strips of adhesive131 are interposed between the various sheets and between the'innermost sheet and the block end wall IT. The strips of adhesive 31 are spaced "from the ends of these sheets so that theend's project beyond the adhesive and'rnay be 'i'ndividually grasped by the fingers. Theoutermost sheet'may accordingly be readilf'gra's'ped and separated from the remaining sheets'when the outermost sheet becomes w'orn. i It will be seen that the'adhesive securing'the various sheets in place is at the ends of the block so that the sheets fold about the corners joining the block ends to the'block surface' 'As a result a longitudinal pull upon the sheet must be trans mitted about the corner of the block, thereby permitting the outer strip of adhesive to'holdrthe sheet in place. Furthermore, after the 'sheets have been withdrawn the portion of the overlying sheets having adhesive thereon is at the end of the block where it does not contact the surface being sanded.
the sheets are the spirit of my invention.
. I claim:
1; A sand paper block including an elongated lip projecting from each end of said body, one of 7 said lips being flush with one surface of the body and the other being flush with the opposite sur- If it is desired the innermost sand paper layer face of the body, a series of abrasive sheets overlying each of said body surfaces, the sheets of each series having one end abutting one' of said lips and extending over the end of the other of said lips.
2. The structure described in claim land including strips of adhesive securing, the sheets of each series together, the adhesive strips being solely located outwardly of the ends of theblock. f 3. The structure described in claiml in which the sheets extend beyond the lips and adhesive strips secure the sheets together said adhesive strips lying solely outwardly of the ends of the block.
4. A sand paper block including an elongated body having parallel opposed bearing surfaces and walls connecting said surfaces, a series of sheets of abrasive -material overlying one of said bearing surfaces, the ends of the sheetsbeing curved to overlie portions of 'the' walls of the block, a second series of sheets overlying the opposite' bearing surface, the ends of the second series of sheets being bent to overlie portions of the walls of the block, and strips of adhesive lying solely outwardly of the walls of the block and securing the sheets together.
. RICHARD G. THOMPSON.
, REFERENCES CITED IThe following references are of record inithe file of this patent:
UN ITED. STATES PATENTS