US2555946A - Sander - Google Patents

Description

June 5, 1951 c. 0. TRUSSELL 2,555,945

I SANDER Filed March 4, 1948 2 Sheets-Sheet 1 Hllllmlnnmll Canes/m5 5 751135214 INVENTOR.

HTTOF/VE) June 5, 1951 Filed March 4, 1948 C. D. TRUSSELL SANDER 2 Sheets-Sheet 2 BY Wm.

Patentecl June 5, 1951 UNITED STATES OFFICE 2,555,946 SANDER Clarence D. Trussell, Turnvvood, N. Y. Application March 4, 1911s; Serial so; iass'i invention herein disclosed is a device for e u 'l objects of the invention are to provide simp practical. means for holding a sheet of sandpaper in a f orm in; which it can be readily used for sanding and smoothing purposes.

objects of the invention will appear or .areset; forth in the course of the following specification.

The drawings accompanying and formingpart of the specification illustrate certain present practical embodiments of the invention. Actual physical structure, howeven may be modified and changed as regards the immediate illustration, all within the true intent andscopeof the invention as hereinafter defined and claimed:

F 1 iafih q a inesisa ne i eq view of one form of the holder with the sandpaper en; gaged thereon;

Fig; 2*isfa broken longitudinal. sectional view of; he holder with the clamp. lever shown in pa ly lifted and released'pos'ition;

Fig. 3 is a brokensectional view with the spring elan p lever in fully engaged and holding posi- Fig; 4 is an end View of theholder;

Fig. 5 is a cross sectional view as on substantially the plane of line 55 of Fig. 3, with the clamp bar in its expanded position, before entering the holding slot, shown in broken lines;

Figs. 6 and 7 are broken side and end views,

respectively, showing in particular a modified form of hinge mounting for the clamp bar;

Figs. 8 and 9 are side and end views, respectively, of a modified form of the invention, involving in particular a rectangula form of the holder;

Fig. 10 is an edge view of the spring clamp bar shown in the latter form of holder.

Basically the invention comprises a block or form over which the sandpaper is stretched and firmly held and which is of such a shape as to provide a convenient grip for holding in the hand and to give a desired contour to the sandpaper surface.

As first shown, the block H is in the form of 2 Claims. (01*. 51 -481) 2 a cylinder Ora" lehgthand diameter to be conveniently gripped in the fingers. v "The sandpaper l2 is wrapped about this block, with its ends turned at l3, l l, into a relative- 1y deep groove l5 running substantially the full length ofvthe' block. w I

A holding bar l6 overlies and secures the inturned ends of the sandpaper in the groove l5. this bar is shown particularly in Figs. lto 5 as comprising strip of sheet metal folded lorrgi tud inally into substantially y-shaped cross section to form two divergent springv wings I'I. [it s pa ated a heatr s edges sufficiently to en a in t e nd rn edges of th sandpaper, when forced down into fully seated position in the groove l5} f v 11 1. 5. m rh in p sition it n pansiye for-cabut it is considered preferable to pivotally secure the bar at one end as by means ofa cross pint!) driven through the end of the roll in position to intersect one end of the w i N P t e gos te d o hel n grip o i shown asrecessedor countersunk at 20 teaceornrnodate a finger fer lifting up the end of the ho her i wir s to he slo n clea it of holding engagement with the in-turned d o he nd ep r With this construction it is simply necessary to bend one end of the sandpaper, insert it in the grqove I 5, wrap the balanceof. the paper about the roll and turn in the final edge into the groove, after which the holding lever [6' may be forced down into the groove over the inturned ends to draw the paper smoothly and firmly about the roll and to secure itself in the fully seated position in the bottom of the groove. Fig. 5 shows in broken lines how the divergent wings ll, I8, of the holding bar, being wider than the groove or that portion of the groove occupied by the in-turned edges of the sandpaper, will necessarily engage and be compressed by the in-turned edges and so will, of necessity, firmly grip and hold the ends of the sandpaper and hence the body of sandpaper about the roll. Figs. 6 and '7 show how the pivot mounting for the clamping bar may be a partly cylindrical extension 2| on the end of the hand grip roll, having a center 22 corresponding to the axis of the pivot pin 23, thus to provide ample material for the mounting of this hinge pin.

This is desirable particularly in the case of the roll being made of wood, which by preference it normally would be. While for reasons of economy and availability Wood may be genwill 1m indefinitely.

erally preferred, it is contemplated that other materials may be employed for making the body of the holder.

Figs. 8 and 9 illustrate a holder made in substantially square cross sectional form.

In this particular instance the holder is made in two longitudinal sections or halves 24, 25, held together by dowel pins 26 or the like. In this case the groove 21 for the clamp bar may be formed partly in the meeting faces of the two block sections 24 and 25 and the pivot pin 28 may be held at its ends in sockets provided for it in the opposing side walls of the groove.

The clamp bar in this instance is shown as an elongated strip of metal doubled upon itself at 29 to form a handle end and having the separated ends engaged over the pivot pin 28. This strip is shown as having overlying lugs 30 punched out of the opposite sides of the same to position small spreader springs 3| which in quickly and immediately removed for replace ment by a fresh piece or by another piece of different grain.

The device can be produced at low cost and It may be made in any size, for example for gripping in either one or both hands.

- While the holding block has been shown as of solid material, it is contemplated that this may be of hollow formation, made up, for exfolded or rolled to the desired conformation. The bar holding the ends of the sandpaper, by reason' of its spring construction, holds itself firmly in place in the groove l5 and yet can be quickly andeasily released by lifting the free -end of the same.

The groove is preferably deep enough to fully receive'thebar so that it will not project bey ond the surface of the sandpaper when the device is in use.

The constructions disclosed permit the sandpaper to extend the full length of the holder prising a block for gripping in the hands and about which a piece of sandpaper may be wrapped, said block having a longitudinally extending groove into which the ends of the Wrapped sandpaper may be turned, and a clamp bar seated in said groove over the in-turned ends of the sandpaper for holding the latter in firmly wrapped position about the block, said bar being a transversely folded strip of sheet material with the oppositely folded sides of the same flared apart to yieldingly engage and grip the in-folded ends of the sandpaper, said bar further being of springy material and pivoted at one end in the groove with the folded edge of the strip to operate as spring tensioned grips ample, of sheet material, metal or otherwise;

pressing the infolded edges of the sandpaper inwardly as the bar is hinged inwardly into the groove and to then operate as spring retainers resisting outwardreleasin'g movement of the bar.

2. A sander of the characterdisclosed comprising a block composed of longitudinal sections secured together in face to face relation and having at one side of the block the complemental portions of a longitudinal groove formed partly in the meeting faces of the two block sections,

a pivot pin extending through said block sections across the groove at one end of the block and a bar spring tensioned to greater width than the width of said groove, pivotally engaged on said pivot pin at one and having its opposite end exposedat the opposite end of the block,

said bar having spring expanded sides for yieldingly gripping the ends of a sheet of sandpaper Wrapped about the block and turned into the groove formed between the two sections of the block.

: CLARENCE D. TRUSSELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Great Britain July 5, 1905

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