US1497921A - Rotary brush - Google Patents

Description

June E? 1,497.921

A. LEVEDAHL ROTARY BRUSH Filed Jan. 26. 1921 Patented June 17, 1924.

NITED STATES AXEL LEVEDAEL, or AURORA, ILLrNoIs, AssIGNoR 'ro INDEPENDENT PNEUMATIC TOOL COMJPANY, F CHICAGO,

ILLINOIS, A. CORPORATION 0T DELAWARE.

ROTARY BRUSH.

Application filed January 26, 1921. Serial No. 439,915.

To all whom t may concern.'

Be it known that I, AXEL LEVEDAHL, a citizen of the United Aurora, in the county of Kane and State of Illinois, have invented new and useful Improvements in Rotary Brushes, of whlch the following is a specification.

This invention relates to rotary vwire brushes.

Among the objects of my invention is to rovide a rotary wire'brush which may be attached to the rotary s indle of a portable pneumatic or electrical y operated tool so that rust, scale, old paint, and dirt may be removed from iron surfaces, sand remove from castings after they are molded, and structural surfaces, ships, railway cars and `the like may be cleaned preparatory to finishing and painting, all by power, thus saving a great deal of time in this work and allowing the work to be dorre with much more rapidity and eliiciency than by hand brush as heretofore employed in this connection.

Another object of my invention is'to provide a brush which will stand up under the hard service to which it is subjected in this work. l

A further object of the invention 1s to have all the wire bristles of the brush of the same length, whether the brush is flat vor beveled, so thatv all of the bristles will have the same degree of rigidity and moreover avoid the necessity of making and carrying in stock bristles of diiferent lengths for one size of brush.

A still further object is to have the bristles extend outward from the block or body of the brush in a direction aglainst the direction of rotation of the brus and at such 4 angle that the points of the bristles contacting with the surface to be cleaned are retarded with respect to the direction ofr rotation of the brush, to lessen vibrations of the bristles as theyv strike that surface.

A. further object of the invention is to lessen the centrifugal force or eect of that force on the bristles by arranging them at angles'against that force.

The invention consists further in the matters hereinafter described and more articularly pointed out in the appended c aims.

In the accompanying drawmgs Fig. 1. is a s1de view of a rotarybrush constructed inaccordance with my invention States, residing at d other material, and, as shown in Figs. 1

and shown attached to the rotary spindle of a portable power driven tool;

Fig. 2 is an .enlarged vertical sectional view of said brush;

Fig. 3 is a rear view of the brush, with a portion of the metal cover broken away to show the rear facev of the brush back or body covered by the same;

Fig. 4 is an enlarged vertical sectional view taken on line 4-f-4 of Fi 3; and

Fig. 5 is a side view of a at brush embodying the features of my invention.

The'brush of my invention comprises an annular back or block 1 made of wood or and 2, the Ifront face 2 of said block is beveled outward from the annular edge of the block toward the center, while the rear face 3 'is beveled in the same direction inward, thus giving the block the crosssectional shape shown in Fig. 2. The block 1 is provided with a plurality of holes 4 extending through the same from the inner to the outer face thereof. These holes are distributed over the block and are arranged in concentric circles, as shown in Fig. 3. Ilihe holes are substantially parallel and are spaced circumferentially apart in each-row and each extends through the block at an angle of substantially 10 to the direction of rotation of the brush and at an angle of substantially 10 to the front face 2 of the block, as evidenced by the dot and dash line m in Fig. 2.

For each circular series of vholes 4 are provided bristles made of hardened wire or equivalent material. Each filler is made substantially U or staple shaped, as shown in Fig. 4, and is inserted into its associated holes -4 from the back of the block, one leg of the filler in one hole and the other leg in the adjacent hole. A plurality of bristles are inserted into these holes soV that there will be a'tuft or pack of bristles for each two holes, as show-n in the drawings.

The holes 4 being arranged at the angles mentioned serves two purposes. First, the bristles 5 extend backward against the div rection of rotation of the brush,A as indicated by the arrow in Fig. 4, and this causes the 105 points of the bristles, Contactin with the surface to be cleaned, to be retar ed as comared with the'direction of rotation of the rush. This lessens the vibrations on the bristles 5 as they strike the surfa, because Mil the bristles strike the surface on recoiling, thus reducing the likelihood of early breakage because free vibration is prevented. The legs or prongs of each'bristle 5 being parallel and set at the angle mentioned avoids stubbing of either prong when in contact with the surface.

Arranging the bristles 5 at angles of substantially 10 inward from right angles to the fiat front face of the block 1, lessens the centrifugal force or the strain of that force on the bristles as the brush is rotated. Such force naturally would be stronger when the wire bristles are at right-angles to the front face of the block, and by the arrangement mentioned the effect of this force on the bristles is diminished, thus guarding against free vibration with the attendant result `of early breakage.

By providing the brush block 1 with a beveled front face, as shown in Figs. 1 and 2, the working face of the wire bristles is given a like shape, while still having all of the bristles of the same length. This is an advantage because all of the bristles have the same degree of rigidity or strength and thus stand up to an equal extent as the brush is used. Furthermore, 'the bristles being of the same length whether in the inside circle or in the outside one or in any of the intermediate ones, requires only that bristles of the same length be kept in stock for any of the circles, Without being required to keep on h and for repairs, bristles of different lengths as is required in those brushes as heretofore made where the working face of the brush is given the general shape shown in Fig. 2 by having the bristles of the various concentric rows of different lengths.

The brush is provided with a pressed steel back or cover 6 made cup shaped to lit against the rear face 3 of the block 1 and having an annular outerliange to lit about the outer annular edge of the block, as shown in Fig. 2. Both the block 1 and cover 6 haveregistering holes centrall arranged to receive the outer end of a sha 7, adapted to be connected by chuck with the outer end of the rotary spindle 8 of a portable pneumatic or electric tool 9, partly indicated in Fig. 1. .To

hold the brush on the shaft 7, a nut 10 is applied to the outer end of the shaft against the front face of the block 1, such face of the block being flat for that purpose, and on the shaft, back of the cover 6, is a washer or disc 11 clamped between a shoulder on the shaft 7 and the cover 6 when the-nut 10 is tightened. This construction allows for ready removal of the brush from the shaft 7, and.y when the brush has been removed the metal cover 6 may also be taken' olf of the block 1. To allow this to be done conveniently Y in case the cover 6-shou1d lit tightly on the block 1, the cover isprovided with' several apertures-12 to permit the pointed end of the tool to be inserted through the same and forced against the block 1 for pushing the latter out of the cover 6.

The metal cover 6 makes the brush safe,

as it prevents the block 1 from flying radial- `5 in case any of them become broken and otherwise damaged during the operation of y the brush. This also allowsY for repairs to the block 1 in case it should become broken or damaged while in use, and adds to the econom of the construction for the reason that bo ies 1 may be kept in stock filled with bristles 5. Only one metal cover 6 is made necessary by reason of this construction .for each tool, as the cover will stand a great deal of wear and will not often have to be replaced. y l

As shown in Figs. 2 and 3, the'block 1 is provided in its rear face 3 with a plurality ofconcentric. grooves 13, into which series of holes 4 open, and these" grooves are/deep enough to allow the wire bristles 5 to be held `firmly in place and be below the surface 3 "which are parallel and in planes at rightangles to the axis of rotation of the shaft or spindle 7a. This also has a metal cover 6a having a contour to conform to the body 1a and to lit over it in the same manner as in the beveled brush shown inthe preceding figures. This flat brush also has a plurality of wire bristles 5, similar to the ones in the beveled brush and arranged at the same angles as before. two brushes is that in the preceding figures the brush is conical, as indicated, while in Fig. 5 the brush is flat. Otherwise the features of construction remain the same.

A brush embodying the `features disclosed,

is capable of standing up under the hard Service and usage to which it is placed when cleaning iron surfaces, casings, and the'like,

and the wire bristles, being arranged to lesstion and arrangement of parts shownmay The only difference' between the be variously changed and modiied without departing from the spirit and scope of my invention.

I claim as my invention: r

1. A rotary brush, comprising a block, and a plurality of wire bristles secured to said block and projecting outward from the front face thereof in directions extending backward with respect to the direction of rotation of the brush.

2. A. rotary brush, comprising a block, and a plurality of wire bristles secured to said block and extending outward from the'ront face thereof, said bristles extending inward against the centrifugal forces set up on rotating the brush at angles less than ninety degrees to the front face of Said block.

3. A rotary brush, comprising a block, and a plurality of wire bristles secured to said block and extending outward from the front face thereof, said bristles extending inward against the centrifugal forces set up on rotating the brush at angles less than ninety degrees to the front face of the block, said bristles also extending backwardwith respect to thev direction of rotation of said brush.

4. A rotary brush, comprising an annular block, said block having a conical front'face, and a plurality of wire bristles secured to said block and extending outward from the front face thereof, said bristles all having the same length and extending backward with respect to the direction of rotation of the brush.

5. A rotary brush, comprising an annular block having a conical front face and a com plementary concave rear face, a plurality of wire bristles arranged in concentric rows and secured to the block and extending outward from the front face thereof, said bristles extending backward with respect to the direction of rotation of the brush and .inward against the centrifugal forces set up on rotating the brush at angles less than ninety degrees to the front face of the block, a cupshaped metal cover applied against the back of said block and fitting against the rear face thereof, said cover and block having centrally arranged, registering openings, a spindle extending through said openings, and means for securing said back and cover to said spindle. n

6. A rotary brush, comprising arrannular block provided with a plurality of holes extending therethrough rom the front to the rear face thereof andarranged in concentric circles, and a plurality of staple-shaped bristles, said bristles being inserted into said holes from the rear face of said block with the prongs of each bristle in adjacent holes and having their looped ends over the portion of the block between the holes, the back of the block being provided with concentric grooves to accommodate the looped ends of the bristles, said holes being drilled through the block at angles to cause the bristles to ex? tend .backward with respect to the direction of rotation of the brush and inward against centrifugal forces set up on rotating the brushl at angles less than ninety degrees to the front face of said block, and a cup-shaped metal cover applied over the block and itting against the rear face thereof to hold the bristles in pla-ce. said cover having an annular marginal flange fitting over the outer edge of said block, said cover and block having registering openings to receive a spindle.

In testimony that I claim the foregoing as my invention, I aix my signature, this 20 day of January, A. D. 1921.

AXEL LEVEDAHL.

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