US2595428A

US2595428A - Sander

Info

Publication number: US2595428A
Application number: US159917A
Authority: US
Inventors: Clarence D Trussell
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-05-04
Filing date: 1950-05-04
Publication date: 1952-05-06
Anticipated expiration: 1969-05-06

Description

May 6, 1 c. D. TRUSSELL SANDER 2 SHEETS -SHEET 1 Filed May 4, 1950 May 6, 1952 c. D. TRUSSELL SANDER 2 SHEETS-SHEET 2 Filed May 4, 1950 QINTOR.

0 0 V? r w y; & A r

Patented May 6, 1952 UNITED STATES FATEN'E @FFE'CE 8 Claims.

1 The invention herein disclosedrelates to what are generally known as sanders, and is a continuation-in-part of application for patent-Serial I'-Io.27 ,869,filed May 19, 194%,and now abandoned.

Particular objects of the invention are to provide means for holding sandpaper-or other rubbingmaterial in a convenient form for rubbing, smoothing, polishingand the like; and in a shape to-be readily grasped and heldinthe hands and of-- such construction that the sandpaper, emery cloth or other rubbing material may be quickly and easily placed in position-for use or be removed for replacement by fresh material 'ormaterial of a different grain or character.

Particularly it is a purposeofthe invention'to provide-a holder which will-have no parts protruding'beyond the sandpapen so that the device may be used to reach fully into'corners'and limited spaces.

Another important object of the invention is to provide the sandpaper or other-covering material in a prepared form, ready to be applied and to-closely fit the holder without-preliminary folding or other time consuming, troublesome operations.

In this connection it is a further purpose of the'invention to provide the sandpaper or other such material in a prefolded, flat condition, ready to be opened up and applied to the holder, and in such shape that the ends or the paper will project beyond the block or grip portion of the holder to prevent slivers or the like entering between the paper and the holder.

Further important objects of the invention are to effect automatic, secure locking in place of the sandpaper on the holder and at the same time to provide for quick, easy release and removal of the sandpaper.

A further important object of the invention is to provide an'easy operating trigger construction for effecting'the quick release of the sandpaper from the holder.

Special objects of the invention also are to provide a device having the characteristics outlined which will be of simple construction and low cost.

Other desirable objects attained, as well as the novel features constituting the invention, are set forth or will appear in the course of the following specification.

The drawings accompanying and forming part of the specification illustrate certain present preferred embodiments of the invention. Structure, however, may be further modified and changed,

all within the true intent-and scope'of the invention as hereinaftr'defined and claimed.

Fig. 1 in the drawings is a perspective view of one of the sanders;

Fig. 2 is a longitudinal sectional view of the same showing the holding bar fully lifted to clear the sandpaper, the end of the bar indicated as broken away;

Fig. 3 is an end view of the device showing the spring holding bar in the upstanding position clear of the sandpaper and with dotted-linesindicating howthe bar will be compressed to apply spring tension to the securing of the paper as it is lowered in the holding-groove;

Fig. 4 is a longitudinal sectional View of 'the device showing the bar fullylowered in holding position;

Fig. 5 isan end view ofthe device with the bar in this position;

Fig. 6 is a broken away and part sectional side elevation of a modified form of the device having the block orbody of the holder m-adeupof a piece offolded sheet metal;

Fig. '7 is an end elevation of the latter;

Fig. 8 15-2. plan view-of a sheetof abrasive material showing how it may be lined toaccurately fold-into closed gripping engagement about the holder block; 1

Fig. 9 is a broken perspective view showing. how the lined-rubbing material may becollapsed on the 'foldin'glines into a compactbundle for-shipument purposes;

Fig. 10 is'a longitudinal sectional viewof a modified formof'the invention: with the holding bar downin securing position;

Fig. 11 is a similar view showing the Lt'rigger operated totrip and release the holdingbar;

Fig. 12 is a View looking at the trigger 'endof the device;

Fig. 13 is an enlarged cross sectional vie-was Fig. 14 is a view of the opposite or hinge end of the device;

Fig. 15 is an end elevation showing a modified form of the tubular block.

In principle the invention comprises a block or base about which the sandpaper or other material is rolled, having a longitudinal groove .into which the ends of thematerial are tucked and held-by a clamping bar.

The block or'body of the holder is designated 1 I, and While shown in square cross section, may be of other desired angular 'or curvilinear section.

For practical reasons this holding .blocktmay be in the nature of a bar of wood or'otherimaterial,--of a length and cross section 'to'zbe con- 1 veniently gripped and held. intone: or hofthhands.

The groove i2 is shown extending full length down the center of one side of the block and the sandpaper H3 or other material used, as having infolded flaps I l, I5, tucked in over opposite side walls of the groove and held so by the spring clamping bar IS.

The clamping bar is shown made up of a single strip of springy sheet metal doubled to provide a rounded handle H at one end and having at the opposite free ends angularly extended lugs l8 pivotally engaged on the pivot pin or stud l9. These pivot lugs may be integral or attached portions of the spring clamping bar and they are shown in Fig. as inwardly ofiset toward each other at 20 to allow the doubled spring bar to expand to its widest extent as shown in full lines, Figs. 2 and 3, when the bar is opened up, fully clear of the groove in the block.

In this fully expanded condition the sides of the folded strip will frictionally grip the infolded edges of the sandpaper as soon as the bar is pivoted inward into the slot. And this gripping pressure will increase as the bar is lowered fully into position within the groove, as in Figs. 1, 4 and 5.

The groove i2 is shown extended angularly at 2| at the hinge end of the block to freely receive the offset hinge lugs [8 of the clamp bar. In the fully seated position the bar may rest on the bottom of the groove as in Figs. 4 and 5, wholly below the surface of the block and hence in non-interfering position.

To prevent the bar interfering in any way with free use of the device, the bar is preferably made of a length less or no greater than the length of the block, substantially as indicated in Fig. 4. And under such circumstances to provide access to the end of the bar, for raising it from its holding position, the end of the block may be recessed as indicated at 22, providing for engagement of a finger beneath the rounded handle forming end I! of the bar.

The block may be made all in one piece or, as indicated in Figs. 1 and 2, in two complemental portions suitably secured together as by means of dowels, pins, nails, screws or other through fastenings 23.

An advantage of this two-part construction is that relatively narrow strips of molding may be used, rabbeted at one corner so that two companion lengths of the molding may be put together with the rabbeted portions in face-to-face relation to complementally form the clamping groove l2.

The holding block may be made of wood, be molded in plastic or be otherwise formed. Wood is economical and provides desired weight and solidity.

The block also may be made of sheet material folded to shape, such as metal, very heavy cardboard or the like.

Figs. 6 and '7 illustrate a form of the block made up of sheet metal 24 folded to square cross sectional tubular form, except at the side for the groove where the free edges of the sheet material are turned inward at 25 to leave a full length open-ended groove for the clamp bar IS.

The inturned edge portions 25 of the folded sheet metal are shown extended at 26 at one end to provide lugs for the hinge pin z'l-which latter, as shown in Fig. '7, may be in the form ofa long rivet extending between opposite sides to hold the folded structure in its square cross sectional form.

The inturned portions 25, of the sheet. metal are further shown as having angularly "turned shown as

wi flanges

28, 29, projecting from one such portion toward the other, as appears in Fig. '7, to serve as spacers holding the groove forming side walls of the structure apart when this tubular form of block is riveted or otherwise secured in its squared-up form.

To facilitate the application of the sandpaper and the close folding of it about the block, it is preferred to have the sandpaper or other material in sheets, as shown in Fig. 8, of a proper size to accurately fit the block, and to score it or crease it on lines 30 near opposite edges to define the inwardly folding securing flaps I4, l5,

' and to score or crease it on intermediate lines such as 3|, to fit the corners of the block.

These pre-lined sheets may be shipped flat or, in some instances, they may be folded on the lines 30, 3|, as indicated in Fig. 9, to form a narrow, fiat, compact bundle suitable for shipping or possibly carrying in the pocket or the like.

A special feature of the invention is the making of the sandpaper covering longer than the block and the infolding of the extended ends as indicated at 32, to provide doubled, reinforced edges beyond the ends of the block which will prevent the paper from slipping under slivers or splinters and being torn thereby. This double reinforcement of the exposed ends of the sandpaper also saves Wear and tear on the ends of the block and generally provides a more stable, useful form of article.

To provide for these end folds, the blank shown in Fig. 8 is illustrated as having score lines 33 where the ends are to be folded back to provide the double thickness.

The forming of the blank with score fold lines, in addition to saving time and trouble in locating and closely fitting the sandpaper about the block, saves breaking and tearing of the sandpaper which, particularly in the heavier grades, frequently follows when a piece of sandpaper is bent to form a folding line, and such bending usually results in irregular, non-straight lines which would cause the sandpaper to fit loosely or unevenly and in places bulge away from the block.

In the modified form of the invention shown in Figs. 10 to 14, the holding bar is of V-shaped cross section so as to wedge in place over the inturned edges of the sandpaper and automatically lock in that position by reason of the spring expansive force of the V cross section.

This expansive spring channel form of bar is designated 35.

In practice the locking of this bar is so effective and firm that difficulty may be experienced in releasing it. Accordingly, there is provided what has been termed a trigger, in the form of a trip lever 3% pivoted mid-length at 3? beneath the bar, at the end of the slot opposite the hinge, said trigger engageable at its opposite end with the her and having a thumb press portion 33 at its outer end. To accommodate the rockin action of ("is trigger, the bar receiving slot I2 is en-ed and deepened at 39 sufficiently for free operating clearance of the trigger or trip lever.

In both forms of the invention illustrated the trigger is shown as Ll shaped in cross section.

In the embodiment, in which the clamping bar made up of sprin separated, substan- ...'ily i. Hie} bars, the trigger is mounted with the U-shaped cross section inverted and the inner crowned end of the trigger arrangedto engage the lower edges of the parallel spaced bars,

the trigger is arranged with'the hollow or concave side of the same uppermost, as shown in Fig. 13, to engage beneath the-center of the V- shapedclamping bar, as particularly shown in .In both instances the opening trigger provides a quick acting means for immediately releasing and lifting the clamping bar from its seated, sandpaper holding relation in the holder.

To avoid sharp edges on the clamp bar which might cut into the hand applying pressure to the block, these edges may be rolled inward as indicated at 4B in Figs. 12, 13 and 14, and these pressure applying or hearing edges aiso serve as stiffening flanges reinforcing the sheet metal bar.

Fig. 15 illustrates the hand grip block 4| made in the hollow form but all in one continuous, unbroken piece, extruded or injection molded in plastic material. This material has advantages over wood or metal and in the extruded or injection molded form may be less expensive.

What is claimed is:

l. A sander of the character disclosed comprising a block having a groove to receive the ends of a sheet of rubbing material Wrapped about the block and a clamp bar engageable in said groove over the inturned ends of the rubbing material,

. said bar comprising a strip doubled on itself intermediate its ends and having angularly extended lugs at one end of the same pivoted in the block at a point to oiiset the bar from the adjoining end of the block when the bar is swung outwardly clear of holding engagement in the groove, said folded strip tensioned to spread apart and the pivot lugs being inwardly offset toward each other to permit the side portions of the folded strip to fully separate when the bar is swung open, offset from the end of the block.

2. A sander of the character disclosed comprising a block having a groove to receive the ends of a sheet of rubbing material wrapped about the block and a clamp bar engageable in said groove over the inturned ends of the rubbing material, said bar having angularly extended lugs at one end pivoted in the block at a point to offset the bar from the adjoining end of the block when the bar is swung outwardly clear of holding engagement in the groove, said block being of hollow tubular form, made up of sheet material rolled into the form of a tubular block with the ends of the same turned inward to provide the groove and said inturned ends having angularly projected edge flanges holding the inturned ends spaced apart in groove forming relation and the pivot for the bar consisting of a pin extending through opposite sides of the sheet material forming the block and through the pivot lugs on the end of the bar and holding the inturned ends together to the extent determined by said angularly projected edge flanges.

3. A sander oi the character described comprising in combination, a block having a groove to receive the ends of a sheet of rubbing material wrapped around the block and a clamp bar engageable in said groove over the inturned ends of the rubbing material, said bar having angularly extended lugs at one end pivoted in the block at a point to offset the bar from the adjoining end 01" the block when the bar is swung outwardly clear of holding engagement in the groove, said block being of hollow tubular form. made up of sheet material rolled into the form of a tubular block with the ends of the same turned inwardly to provide the groove andsaid inturned ends having angularly projected edge flanges holding the inturned ends spaced apart in groove forming relation and a pin extending through opposite sides of the sheet material forming the block and through the pivot lugs on the'end of the bar and holding the inturned ends together to the extent determined by said angularly projecting flanges, said sheet of rubbing material having parallel fold lines impressed therein to match the angles of said block, andsaid sheet being folded on said fold lines as impressed around said block for conforming to the general shape thereof.

"4. A sander comprising a handgrip block having a longitudinal groove in one side, a sheet of sandpaper wrapped about the block and having preformed fold lines near opposite ends of the same defining securing flange portions at the ends of the sheet to be tucked into said groove and a clamp bar engageable in the groove over said tucked-in end flange portions of the sandpaper, said block being of angular cross section and said sheet of sandpaper having other preformed fold lines matching the corners of said angular block and fold lines at right angles thereto near those edges of the sheet which will be at the ends of the block for doubling over said edges at the ends of the block and said sheet being enough longer than the block for said doubled over edges to project out beyond the ends of the block into position for abutting engagement with the ends of the block and covering the lines of demarcation between the sides of the block and the surrounding sheet.

5. A sander of the character disclosed, comprising a block having a groove to receive the infolded ends of a sheet of rubbing material wrapped about the block, a clamp bar engageable in said groove over the inturned ends of the rubbing material, and a, finger actuated trigger pivoted in said groove beneath said clamp bar in position to lift the clamp bar out of its seated relation in said groove, said pivoted trigger having a projecting finger hold exposed at one end of the block.

6. A sander of the character disclosed, comprising a block having a groove to receive the infolded ends of a sheet of rubbing material wrapped about the block, a clamp bar engageable in said groove over the inturned ends of the rubbing material, and a finger actuated trigger mounted in the block in position to lift the clamp bar out of its seated relation in said groove, said clamp bar being pivotally mounted at one end in the block and said trigger being a finger lever pivotally mounted in the other end of the block beneath the free end of said pivoted clamp bar.

7. A sander of the character disclosed, comprising a block having a groove to receive the infolded ends of a sheet of rubbing material wrapped about the block, a clamp bar engageable in said groove over the inturned ends of the rubbing material, and a finger actuated trigger mounted in the block in position to lift the clamp bar out of its seated relation in said groove,

said clamp bar being pivotally mounted at one end in the block and said trigger being a finger lever pivotally mounted in the other end of the block beneath the free end of said pivoted clamp bar, said clamp bar being of V-shaped cross secltion and said trigger lever being of U-shaped pross section engageable beneath the edge of said 8. A sander comprising a hand grip block having a longitudinal groove in one side, a sheet of sandpaper wrapped about the block, said sheet having preformed fold lines in opposite ends of the same defining end flanges positioned to tuck into said groove when the sheet is folded about the block, said sheet in its wrapped position about the block projecting beyond one end of the block and having the projecting portions of the same folded inward over the end of the block to cover space between the sides of the block and the overlying sandpaper and in position for abutting engagement with the adjoining end of the block and a clamp bar yieldably engaged in said groove over said tucked-in end portions of the sandpaper.

CLARENCE D. TRUSSELL.

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

UNITED STATES PATENTS Number Name Date 449,930 Dubey Apr. 7, 1891 1,635,350 Simons July 12, 1927 1,656,981 Lewis Jan. 24, 1928 1,844,996 Walker Feb. 16, 1932 2,403,434 Gulden July 9, 1946 2,457,045 Kitterman Dec. 21, 1948 2,464,950 Smith Mar. 22, 1949