US 2379054 A
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Description (OCR text may contain errors)
June 26, 1945.
SANDING MACHINE 7 Filed May 5 1944 I-INVENTOR. Jase i Zv/r w Wis l forge] Patented June 26, 1945 [awe A SANDING MACHINE I Joseph Zuk, Chicago, ll]. 7
r h Application Mayfi, 1944, Serial No. 534,215
.3 Claims. (oral-135) This invention relates to certain novel improvements in sanding machines, that is, a machine constructed and adapted to-sand panel surfaces and the like by means of a continuous traveling belt.
More specifically the invention is concerned with the novel and effective manner of holding the work in place during the sanding operation and taking out of the work any warp or uneven surface which would otherwise interfere with the effective sanding operation of the machine.
Among thesalient objects of the invention is theconstruction of a device of the character hereinafter described which will be highly efii- -cient in use-and economical in'manufacture.
' I-Ieretofore, in the art of sanding surfaces such as panels and the like, the panel is arranged upon a'supporting platform or grille plate be neath the traveling belt having an abrasive or sanding material thereon. In the sanding operation the position of the work is such that the operator has'veiy little, if any, opportunity of holding the work steadily in place or pressing the same down to remove the warps or other curved portions thereof, this being due to the fact that the work is oftentimes covered by the sanding belt. It is, therefore, one of the many objects of this invention to provide a simple and effective arrangement for holding the work in place and for maintaining it in a substantially fiat horizontal position during the sanding operation.
Other objects will appear hereinafter. The invention consists in the novel combination and arrangement of parts to be hereinafter described and claimed.
The invention will be best understood by refer- I ence to the accompanying drawing showing the preferred form of construction, and in which:
Fig. 1 is a typical side elevational view of a sanding machine illustrating my attachment associated therewith; and
Fig. 2 is a fragmentary plan view of the work holdin platform or grille.-
The drawing illustrates the preferred form of construction of my invention by which the several objects are accomplished.
The usual and standard sanding machine of the type with which my invention is associated, comprises a table ill on which is mounted a work platform or grille II. In some cases this grille H is slidable transversely of the table II] to. permit shifting of the work l2 beneath the sanding belt to be hereinafter referred to. In other cases, this work supporting platform or grille ll is stationary. Ineither case, my invention will be useful. I I v This sanding machine further includesbrackets l3 of any approved design and construction and supported from the 'table- I0- and having bearings l4 formed therein. In'these bearings.
l4 there are jo'u rnalled shafts 15. These shafts have'mounted thereon rollers-l6, either'on'e of which may be driven by a suitable driving agent such as an electric motor (not shown) orthe like. The'rollers l6 are so arranged as to guide a sand ing'belt I! in spaced parallel relation with respect to the grille II. In the present instancefthc upper run l8 of the belt passes over an idle roller Carried by the table In in anysuitablemanner as at 2|] is a supporting plate 2| .having trans versely extending bores 22 formed therein, Slidably mounted in each ofthesebores 22 is aconduit 23. Each conduit 23 terminates into anipp'le 24 and secured to this nipple in anyapproved manner as at 25 are suctioncups 26 preferably formed of rubber or other compressible or resilient material.
These cups 26 are disposed within an open area 21 formed in the grille II and are supported by the supporting plate 2| in such manner that each cup may be adjusted longitudinally of the grille II for reasons hereinafter set forth.
The opposite end of each of the conduits 23 likewise terminates into a nipple 28, and each of the nipples 28 has secured thereto the end 29 of a flexible hose 30, the flexibility of the hose 30 being such as to permit the ready adjustment of the cups 26 in the manner hereinbefore stated. Each hose 30 communicates with a valve structure 3| of any approved construction, but preferably including a foot-operated valve stem 32 comprising a foot pedal or plate 33. This valve structure 3| has communication through the medium of a conduit 34 with a suction pump 3i (symbolically illustrated in Figs. 1 and 2) of a well-known and approved construction which in its operation creates a suction within the cups 26 when the valve 3| is open.
In the usual operation of a standard sanding machine of the type hereinbefore described, the operator places the work 12 upon the grille and through the medium of the use of a flat trowel 35 or the like he presses the same down upon the belt ll, bringing the abrasive surface thereof into contact with the work by zig-zagging his hand transversely of the belt so as tocause the trowel 35 to impart a zig-zag movement to the belt ll and the abrasive surface thereof will likewise be tion over the open space 21 into contact with the tops of the cups 26 and then presses upon the foot pedal 33 by means of his foot, causing the valve stem 32 to move downwardly and upon the valve structure 3|, bringing about suction within the cups 26 by operation of the suction motor 3|. This suction created in these cups 26 will draw the ends of the panel down against the grille H and firmly hold the work I2 in sanding position.
:If the panel l2 be warped or buckled, this suctionwill also cause the panel l2 to flatten out upon the grille ll, thus permitting the operator to effectively perform the sanding operations.
In the drawing and description herein, I have described one form for carrying my invention into effect. This form may change without departing from the spirit of the invention and therefore I do not wish to be limited to the precise form shown, but desire to avail myself of all forms which come within the scope of the appended claims.
Having thus described my invention, what I work mounted on said grille, means for holding said work upon said grille during sanding operation on said work by said belt, said means including a suction pump, resilient cups adapted to engage the surface of said work, means providing conection between said cups and said pump, and means for mounting said cups for adjustment relative to said grille.
2. In combination with a sanding machine which comprises a grille upon which work to be sanded is mounted and a sanding belt movable in spaced parallel relation with respect to said grille and adapted to be brought into contact "with work mounted on said grille, means for holding said work upon said grille during sanding operation on said work by said belt, said means including a suction pump, resilient cups adapted to engage the surface of said work, means providing connection between said cups and said pump, foot-operated means controlling communication between said cups and said pump, and means for mounting said cups for adjustment relative to said grille.
3. In combination with a sanding machine which comprises a grille upon which work is adapted to be mounted and a continuously traveling sanding belt, a run of which extends in parallel spaced relation with respect to said grille and is adapted to be brought into contact with the work upon said grille, means for flattening said work upon said grille and for holding said work firmly in position upon said grille during the sanding operation comprising suction means disposed in position with respect to said grille in contact with the surface of said work, foot-oper-,
ated means for controlling the operation of said suction means, said suction means including spaced resilient cup-like members, and means for mounting said cup-like members for adjustment relative to said grille and work supported thereon.