US2657508A - Sanding device - Google Patents

Description

Nov. 3, 1953 J. HL SCHUBERT 2,657,508

SANDING DEVICE Filed July ll, 1952 Wei/WWW :I vlllllllll/A i by www Patented Nov. 3, 1953 UNITED STATES ENT OFFICE 7 Claims.

My invention relates to sanding devices, and particularly to devices of the type which are operated by hand and which comprise a block or the like to which a strip of sandpaper is attached.

The principal object of my invention is to provide a sanding device having an improved means whereby a strip of sandpaper may be readily attached thereto and, when worn, readily detached therefrom.

Another object is to provide a device of this character in which the means for attaching the strip of sandpaper thereto will, as it is being attached, pull said strip into firm, close contact with said device.

I accomplish these objects by means of the novel combination of elements described below and illustrated in the accompanying drawing in which- Fig. 1 is a side elevation of my device with a strip of sandpaper secured thereto;

Fig. 2 is a side elevation showing the parts in their relative positions when a strip of sandpaper is about to be secured to the device;

Fig. 3 is a section of Fig. l in the plane 3-3;

Fig. 4 is a fragmentary, perspective view of one end of the device;

Fig. 5 is a perspective view illustrating how the device is used in sanding a at surface; and

Fig. 6 is a perspective view showing how the device is used in sanding a concave, curved surface.

Referring to the drawings- My device comprises a base I, which may be of wood, and which has upstanding end portions 2 and 3 provided with opposed re-entrant portions II and 5 therein. The re-entrant portion 5 is shown as having a strip Ii of rubber embedded therein.

'I is the top element of the device, the upper surface of which is preferably curved, as shown, and which is provided on the sides thereof with recesses 8 for the thumb and forenger of the operator.

The bottom 9 of the base is a plane surface and the outer end surfaces of the upstanding end portions intersect the base in parallel-disposed straight lines, such as shown at I0 in Fig. 6. These upwardly-extending surfaces of the end portions are inclined inwardly toward each other, whereby two plane surfaces which intersecteach other at right angles may be sanded up to their line of intersection. The tops II of the end portions are approximately cylindrical and merge smoothly with the inwardly inclined surfaces I2 of the end portions. Thus, the sanding of concave surfaces I3, such as shown in Fig. 6, is facilitated. i

In order to secure the strip Iri of sandpaper to the device, I provide the bottom of the top element 'I with a toggle joint which may be an ordinary hinge having a centrally-disposed pintle I5 forming the knee of the joint and one side or leg I6 of which is secured to the top element by means of screws I1. The other side or leg I8 of the joint is free to swing. The overall length of the toggle, when the legs thereof are substantially coplanar, is somewhat in excess of the distance between the innermost portion of the recess 4 and the face I9 of the rubber block 6 in the recess 5.

In order to attach the strip of sandpaper to the base I, it is cut to such a length that when wrapped around the base, as shown in Fig. 2, the portions adjacent the ends thereof will be disposed in front of the recesses or re-entrant portions 4 and 5. The top element 'I is then placed in the position shown in Fig. 2 with the legs of the toggle in contact with the paper in front of the recesses. Downward pressure applied to the element 'I will force the knee of the toggle or pintle of the hinge downwardly from the position shown in Fig. 2, past its dead center to the position shown in Fig. l, thus securing the paper firmly to the base element. In pressing downwardly on the element 'I, the ends of the toggle legs tend to pull the paper tightly around the block as the element 1 moves from the position shown in Fig. 2 to that shown in Fig. l.

In order to replace the paper, it is necessary merely to pull upwardly on the element 1 which will move the knee of the toggle from the position shown in Fig. l to that shown in Fig. 2

whereby the top element I may be lifted out of,

the base, the worn strip of sandpaper removed and replaced by a fresh strip.

While I have described my invention in its preferred embodiment, it is to be understood that the words which I have used are words of description rather than of limitation and the changes, within the purview of the appended claims, may be made without departing from the true scope and spirit of my invention in its broader aspects.

What I claim is:

1. In a sanding device, the combination with an elongated base element having a plane bottom rigid throughout and spaced, upstanding end portions provided with opposed, transverselyextending, re-entrant portions therein; of means for securing thereto a strip of sandpaper extending around said base element and having its end portions disposed in front of said re-entrant portion; said means comprising a top element having a single toggle joint secured to the bottom thereof with its ends disposed in said re-entrant portions; the knee of said joint being movable by downward pressure applied to said top element from a zone above the general level of said reentrant portions to a zone below said level to force the end portions of said strip into and secure them in said re-entrant portions of said` base.

2. The structure set forth in claim 1 inl wliichf at least one of said re-entrant portions has a resilient lining of substantial thickness.

3. In a sanding device, the combination withan elongated base element having a plane bottom rigid throughout and spaced, upstand'ing' end portions provided with opposed, transversely-extending, re-entr'ant portions therein having their! innermost zones spaced somewhat above the topf` surface of said base extending therebetween; of a singlev toggle joint having its ends?y disposed in said re-entrant portions and its knee, when unstressed, disposed above the' general level of saidre-entrant portions but adapted to be forced by' downward pressure applied thereto into a Zone below said level; whereby, a strip" of sandpaper extending around said base element and having its ends disposed between the ends of said joint and said recesses may be' secured to said base element by downward pressure on thel knee of said joint.

4. The structure set forth in claim 3 in which at least one of said re-entrant portions' has a lining of resilient material of substantial thickness therein.

5. The structure set forth in claim 3 in which the outer end surfaces of the upstanding end portions of said base' element intersect the bottom thereof in parallel-disposed, straightA lines and are inwardly inclined towards each other;

whereby, surfaces which intersect each other at right angles may be sanded up to their line of intersection.

6. The structure set forth in claim 3 in which the outer end surfaces of the upstanding end portions of said base element intersect the bottom thereof in parallel-disposed, straight lines and thereafter curve smoothly upwardly and inwardly towards each other; whereby to facilitate the sanding of curved concave surfaces by the ends of said device.

7. A sanding device comprising an elongated base element having a plane bottom face rigid throughout; spaced, upstanding end portions,

- andi opposed re-entrant portions in said end p0rtions ;v a top element adapted to be disposed between said end portions and provided on the bottornthereof with a hinge having a transverselyextending pintle and one side thereof secured in fixed relation to said top element and the other side thereof free to swing; the overall length of said' hinge being slightly in excess of the distance' between the' innermost surfaces of said reentrant portions, andl said hinge projecting beyond the immediately adjacent portion of each end of said top element; whereby, a strip of sandpaper extending from a zone somewhat past one of said re-entrant portions, around the adjacent end portion of said base element, across theV bottom thereof and around the other end portion and past the re-entrant portion therein may be secured toY said bottom element by placing the opposite end portions of said hinge against the portions of said strip overlying said re-entran-t portions and pushing downwardly on said top element.

JOHN H. SCHUBERT.

References Cited inthe file of this patent UNITED STATES PATENTS Number Name Date 1,009,785 Peterson NOV. 28, 1911 1,183,444 Fisk May 16, 1916 2,402,069 Minnick et al. June 11, 1946

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