US1595700A - Abrading tool - Google Patents

Description

F. N. BACKLIND Aug.

ABRADI NG TOOL Filed Oct. 6 1924 g'mumtoz:

attain;

Patented Aug. 10, 1926.

UNITED STATES PATENT o FicE.

FREFDRIGK N.-

OF DETROIT, MINNESOTA.

AIB'RADING. T0014.

Application filed- October 1 9724.. Serial- No. 744,515.

The invention has for an; object to provide an improvedform of abrasive sheet holderfor rise in finishing various surfaces very materially increase the cuttingelliciency of the abrasive. 7 Another difficulty with prior devices of this nature is from the accumulation of dust between the abrasive sheet and the pad orblock,,- the accumulated dust causing the abrasive to bear excessively upon the work under such accumulation,

raising the remainder of the: sheet as well as causing uneven cutting effect. These objections are entirely overcome in my device.

A further object isto provide a durable device of this nature of extreinely simple form, involving mini-mum of complication and niovement-in-the removal and renewal of the abrasive sheet, as: wellas having. ad-

vantages in its; manufacture. It is also an important aim to enable the production of; such a device at an extremely low cost, tending to obviate entirely the need for any fastening devices to hold a sheet of, abrasive in place upon the body thereof. A further important advantage of my invention consists: in enabling the device to be grasped comfortably for the application of force manually with a minim-un of awkwardness and exertion. It is a further valuable attain-inent of the invention that the hand of the operator is protected at all times, soithatthere is a minimum liability of engaging splinters in fingers or. damaging the knuckles of-the hand. A further important aim of moldings of various shapes, at the sarne time enabling the use of the entire sheet of abrasiveeliiciently. A further important 0bject-is the utilization of the abrasive sheet in affording a firm gripping surface for the the device is to provide a formation therehand to provide a'minirnum liability of slipping of the hand onthe-tool.

Additional objiects, advantages and fea tures of invention reside in the structuralforni, relation and combination of parts as may be more readily understood from the following description and the drawings,

wherein.

Flgure 1 rs perspective view of my in:

vention with a sheet of abrasive engaged thereon as for operation, one: position, of the hand in use being indicated in dotted lines.

Ergure 2 is an end View of-the device.

Figure 3 is a top view thereof,th e abrasive sheet being omitted in the last two views.

Figure 4 illustrates onemethod of grasping the devicefor use.

Figure 5 is a similar view showing a different manner of grasping the appliance. Figure 6' isa section of a piece of molding showingvarious positions of my appliance for accomrnodati ngit to the various; angles, ml-S' awSje T here is illu'strated an abrad ing tool consisting ofa holder part 10 shown in Fig tires-2 and? upon which there is movably engaged a sheet of, abrasive'll, such as sand or emery paper or cloth. The; holder is of a type adapted to hold fine or coarse abrasive sheets, as. may beseen. I The holder comprises a. plate 12 of sheet steel, material about; three-siXty-fourths of an inch in thickness having been employed to goodadvantage. In ractice, the blank for this plate has been crmed five inches by five and a half inches. One endpo'rtion isturned inwardly to form: a lip' or flange 13 having somewhat the appearance of a hook with elongated bill as viewed from one side or end of the device (Figure 2). The flange portion extends in spaced relation with the body of the plate a short distance, usually aboution e quarter of an inch, the space under the flange being slightly greater than the thickness. of the abrasive sheet to be used. The opposite end portion of the plate is bent toward the same side as the flange 13 onni-uch greater radius, however, beginning on a line closelyadjacent or at the they sufficient to easily admit the ends of the fingers of a workman while the palm rests on the part 18. The extreme end edge portion of the inturned part 18 is recurved outwardly asat 15,'one edge of a sheet of cushion material being slipped under this recurved part, the latter being arranged to press up on the cushion material so as to hold it securely. The cushion material 16 comprises a sheet 'of soft rubber preferably smooth and without irregularities upon one side, as manufactured, while upon the other side parallel narrow V-shaped ribs 17 are formed very close together, the elasticity of the rubber as well as its quality being suchthat the material maybe easily deformed by compression. The ribs are more readily yieldable for local pressure such as might be caused by a high grain of sand or the like than would a plain flat surface. The apices of the ribs are spaced not more than inch apart.

The resilient sheet is applied with the ribs running longitudinally of the plate so that extend around the bend 14, and they are also exposed at the outer side of the sheet as applied, the flat surface being securely cemented to the metal 12 throughout the area of the sheet 1.6. The sheet 16 is cut off nearly, or quite, flush with thebight portion of the lip 13. As shown in Figure 2, it might be found preferable to allow the resilient sheet to project slightly beyond the plate 12 at this end, and it may similarly project at each side. The inturned upper part 18 of the plate thus affords a grip when covered with the abrasive sheet, as will be explained. The abrasive sheet has an end edge engaged under the flange 13, and is then extended longitudinally outward over the flange, then downwardly and inwardly under the sheet of resilient materiallG, then around the bend 14, inwardly over the edge 15 as shown in Figure 2, in snug'contact with the sheet 16, and the surplus portion is laid snugly within the bend 14, where its inherent elasticitywill cause it to tend to open out to its original planiform shape and so bind between the body of the plate and the grip 18, resisting tendency of the sheet to become disengaged, as may be understood. f

In the use of this device,the holder 10 is held in one hand while a sheet of sand paper of the proper width and l6I1gtll-,11SL1 ally one-half of the standard sheet of caroenters a eris taken in theother hand and one end inserted under the flange 13 while the abrasive side is turned toward the holder. The end of the sheet being snugly adjusted under the flange 13, the sheet is swung outwardly over the end of the holder, being next brought close against the bottom side and then around the bend 14, over the edge 15 and then longitudinally.

and into the bight under the grip parts 18 as shown in Figure 1. The device may then be grasped by resting the palm on top of the grip portion while the fingers are extended around the edge 15' and inserted under the grip; While grasping the device in this manner, the device may be applied most efficiently to the finishing of plain surfaces.

If it is desired to work in a corner, or close 7 r to a vertical surface, the device is readily adapted to use as shown in Figure 4, or

the grip may be varied, as indicated in Figure 5. The handling and application of the tool will be readily understood by those versed in the art. The'bend 14 is'adapted to use in finishing the concave surfaces of moldings, and in that event the device'may be grasped as shown in Figure 5, and applied to the molding as shown at the upper part of Figure 6. Where angular recesses are involved, the angle between the end of the holder adjacent the flange 13 and the bottom side shapes the abrasive in a manner most suitable to such work, and the device may be used, as dotted in the lowerportion justed as first described, when the-portion which has been over the grip and exposed in the bight under the grip will then be presented over the lower side of the device ready for use.

In applying the device to the work, in 7 case there happens to be a high grain on the sheet, the pressing of the device upon the work will cause the cushion material 16 to yield over such high grain, so'the other parts of the sheet may come into intimate contact with the work, preventing the filling V of alimited part of the sheet 15 with cuttings, which would render the sheet inefficient before other parts have been used at.

all. Any dust that may gain access to the device between the abrasive sheet and the resilient material 16 will be readily accom modated in 'the grooves between the ribs 17 preventing any local portion of the sheet from being raised or pressed excessively in to engagement with the work thereby.

It will be seen that the device is adapted to be produced at a very low cost and it will be found highly 'eflicient in use. liable in a, minimum degree to damage or deterioration from the mostsevere use, and materially increase the amount of work which may be done-by an operative.

' I claim:

1. A device of the character described comprising a sheet metal plate of rectangular form in the blank, one'edge being in-' turned to form a flange closely adjacent the of a sheet of resilient material and the edge body of the plate for the purpose described, of said last named end portion of the plate 10 the opposite end portion of the plate being is turned outward and downwardly upon the bent upwardly, then inwardly over the body resilient material.

5 of the plate in a relation to receive the digits In testimony whereof I allix my signaof a hand grasping said last named edge ture. portion. Y

2. The device of claim '1 having a facing FREDRICK N. BACKLIND.

Images