US159216A - Improvement in machines for polishing wood - Google Patents

Description

S. G. RANDALL.

Machine for Polishi ng Wood Patented Jan. 26, 1875.

OOOOOOOOOOO UNITED STATES PATENT OEErcE SILAS G. RANDALL, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO AMELIA A. RANDALL, OF SAME PLACE.

IMPROVEMENT IN MACHINES FOR POLISHING WOOD.

Specification forming part of Letters Patent No. 159,216, dated January 26, 1875; application filed July 6, 1874.

To all whom it may concern:

Be it known that I, SILAs G. RANDALL, of Providence, in the county of Providence and State of Rhode Island, have invented an Improvement in Machines for Polishing Wood, of which the following is a specification:

This invention relates to a novel method of smoothing or polishing moldings and other articles or surfaces by means of a polisher, which is reciprocated or moved over the art-icle or surface to be polished, or the latter similarly moved in relation with the polisher,

and which combines a flexible lining or facing and any liquid, fluid, or granular substance the particles of which are mobile, so that, on weight or pressure being applied to said sub. stance, the flexible lining or facing is caused, either directly or through the intervention of a polishing-cloth, to act upon and to conform to all irregularities in the surface of the mold ing or article being polished, and so to effect the desired end in the most perfect and regular manner over the entire molding or surface, and so that, by varying the weight or pressure of or 011 the mobile substance, the action of the polisher may have its force increased or diminished to suit different stages of the work. Labor also may be economized by substituting machine for hand labor to actuate the polisher or article under operation of it.

The accompanying drawing simply serves to show the invention as applied, in a rude form, to a single molding, without regard to the means used for operating the polisher, for clamping the polishing-cloth, or for supplying or controlling the substance used to act upon the flexible lining, and which it is preferred should be either air or water, and will here be described as air, although any fluid or liquid substance under pressure will answer; and the invention may be applied to numerous articles, whether of wood or other material, at one and the same time-as, for instance, to a series of moldings arranged parallel with one another.

Figure 1 is an end view of a polisher constructed in accordance with my invention as applied to a molding. Fig. 2 is an under view of the same, showing the flexible lining with the polishing-cloth thrown back. Fig. 3 is a transverse vertical section on the line a: a Fig. 4 5 and Fig. 4, a longitudinal vertical section on the line 3 y, Fig. 1.

A is the molding to be polished, suitably held down on or secured to a bed, B, which may be grooved or rabbeted on its edges, as shown, to provide for the reciprocating action. and guidance along it of the polishing block, form, or base 0, the interior of which conforms, or approximately so, to the shape of the molding. Said 'block, form, or base is lined with a flexible diaphragm, D, fastened down on its edges Z1 to the under side of the block. E is the polishing cloth or material, arranged below or externally to the lining D, and suitably secured on its edges d to the ends of the block. G is a flexible pipe or hose communicating with the interior of the block (J between said interior and the flexible lining D, within which space air (supposing such to be the acting medium) is forced, said air swelling out the lining D, and causing it and the polishingcloth E to conform to all portions of, and irregularities in, the molding, and with an equal pressure and the most perfect regularity at all points, as the block 0 or bed carrying the molding A is reciprocated to and fro, and with any desired force, according to the pressure thrown upon the lining.

I claim- The polishing block, form, or base, in combination with its attached lining, and air, under pressure, or its equivalent, applied to said lining, essentially as and for the purpose herein set forth.

SILAS G. RANDALL.

Witnesses:

WALTER R. BAKER, WALTER W. SrowE.

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