US3042951A

US3042951A - Hold-down lug type brush section

Info

Publication number: US3042951A
Application number: US824332A
Authority: US
Inventors: Ralph F Tilgner
Original assignee: Pittsburgh Plate Glass Co
Current assignee: PPG Industries Inc
Priority date: 1959-07-01
Filing date: 1959-07-01
Publication date: 1962-07-10
Anticipated expiration: 1979-07-10

Description

July 10, 1962 R. F. TILGNER 3,042,951

HOLD-DOWN LUG TYPE BRUSH SECTION Filed July 1, 1959 46 WEN/TOR.

EMF/Y A mom-k t 46 44 Q 4| 47 42 ATTOkW/FY rates lfiatent 3&42351 Patented July it), 1362 3,042,951 HGLD-DQWN SLUG TYPE BRUSH SECTIIQN Ralph Id. Tilgner, Ellieott City, Mil, assignor to Pittsburgh Plate Glass Company, Allegheny County, Pa, a corporation of Pennsylvania Filed July 1, 1959, Ser. No. 824,332 13 Claims. (Cl. 15182) This invention relates to brushes and it has particular relation to the provision of simple and inexpensive units or sections that can be mounted singly or ganged in multiple upon an appropriate arbor or shaft to provide a rotary, power-driven brush. By use of the proper number of sections, brushes of substantially any length can be obtained. It will be manifest to those skilled in the art that the sections when they are ganged, may be of the same diameter, thus forming a cylindrical brush, or if preferred, the sections may be of difierent diameters appropriately stepped to impart tapered effects to the brush.

It has heretofore been disclosed to form brushes of relatively thin annular sections, which can be used singly or which can be ganged together as multiples upon a single shaft or arbor to produce brushes of desired length. Such sections and a method of forming the same are disclosed in Whittle Patent No. 2,288,337. The sections, as disclosed in the patent, are formed by distributing double length fill material between nested, inner and outer continuous or closed bands, and then flanging the edges of the bands radially outwardly in such manner as to provide brush sections in which the flanged inner band constitutes a channel-like backing element and the sides of the outer band are folded together to provide a core of more or less key-hole section, holding the fill material in the channel. The resultant sectional units being formed from closed bands must be fully formed as individual units and require a large amount of individual work and expense to fabricate.

This invention contemplates the provision of novel annular brush sections and a method of forming the same from short lengths of circularized, but discontinuous brush strip material having a channel backing element and fill material locked therein by an appropriate core. Such strip material may be formed in continuous manner by automatic machinery and in substantially any desired length, using a coiled ribbon or strip of sheet metal as a source of material from which the channel backing element of the strip can be formed. In accordance with this invention, this inexpensive brush strip is assembled into a highly useful, inexpensive brush section. v

For a better understanding of the invention, reference may now be made to the drawings, in which FIG. 1 is a view partly in elevation and partly in phantom of one form of a rotary brush'section constructed in accordance with the provisions of this invention.

FIG. 2 is a detail showing in plan one feature of the invention.

FIG. 3 is a fragmentary plan of a modified form of the construction.

FIG. 4 is a fragmentary plan view of a further modified form of the invention. a

FlG. 5 is a fragmentary section substantially upon the line V-V of H6. 4.

PEG. 6 is a fragmentary sectional view of a further form of the invention.

FIG. 7 is a sectional view of still another form of the invention.

In the construction as shown in FIGS. 1 and 2 of the drawings, the brush section 5 is provided and comprises an inner, rigid, circular band it? providing a core having lateral radially projecting flat lugs 11 formed integrally along the edges thereof. The lugs upon opposite sides are opposed to provide coacting pairs and as many pairs as may be required adequately to secure a brush strip are uniformly spaced peripherally along the edges of the band with the lugs on one side lying in a common plane.

A circularized brush strip 12 for the section comprises a channel backing 13 formed in the usual manner from a tape or ribbon of sheet steel or other appropriate metal, and having side walls which are disposed in approximately parallel planes so that the walls project substantially radially outwardly from the band it). The section formed by the turns of the brush strip is straddled by pairs of lugs 11. Within the channel is disposed the bight or median portion of fill material 1 The latter may be of Tampico, nylon fibers, cellulose acetate fibers, steel wire, or any other proper material appropriate for use as a fill for a rotary brush.

The fill material is secured in the channel backing element by a filamentary core 16, also of steel wire or other appropriate material, disposed within the bight portions of the fill material and extending longitudinally of the channel backing of the brush strip.

The brush strip is shown as comprising a single full turn 17, which starts upon one side of the section and terminates upon the other, and the intermediate turn of which is rather sharply angled or ofiset as at 18 to provide recesses or pockets extending oppositely from the lugs 11. These recesses receive the

end portions

19 and 21 of the strip in such manner that all portions of each side of the resultant brush section lie substantially in a common plane. In other words, the section provides a flat or nearly flat annulus encircling the hands it) and being held between the opposed pairs of lugs 11.

The termini of the strip in a zone subtending an arc of the length W, overlap and it will be observed that the ends of the channel backing element are feathered to correspond to the angle of the offset 18, thus further enhancing the flatness of the annulus formed by the strip.

It will be evident that, if desired, the offset 18 may be dispensed with and the requisite degree of flatness of the annulus formed by the brush section may be obtained by extending the feathering at the ends of the strip.

The overlapped portions at W between the termini of the strip and the offset portion 18, are disposed between a pair of lugs 11 and are secured together by appropriate piercing means, such as rivets 23, having upset ends 23a, piercing through the lugs 11 and also piercing the ends of the channel backing element where they overlap at W, whereby securely to hold the channel backing upon the band ill. If preferred, the rivets 23 instead of piercing the sides of the channel backing element, may merely bite into or indent the outer edges thereof to obtain a positive grip upon the latter.

It will be apparent that one of the rivet elements 23 extends directly across the end portions of the filamentary core 16 to hold the latter in place in the channel against centrifugal action exerted when a brush section is mounted upon a shaft orarbor and rotated. The rivets 23 draw the lugs 11 together to exert a clamping action upon the strip.

in order further to enhance the security of holding of the ends of the filamentary core 16 in the channels, the core may be provided with hooked portions 24 at each end engaging the rivets 23. These hooked portions constitute means holding the core against tensional forces.

One method of forming the brush section as disclosed in FIGS. land 2, comprises forming a spirally wound brush strip 12 which has a proper internal diameter and which may be of any appropriate length from a length to form a unit for a single brush section, to a length to provide many multiples thereof. In the latter instance,

r a s the long strip may be severed into sections of proper length for single brush units. The ends of the units may be feathered to the form shown in FIG. 2 manually, as

byfirst cutting or pulling out a portion of the fill material from the channel at each end, or by appropriate .mechanical equipment, and then crimping the sides together to give the desired angle of bevel. The short sections of spiral thus provided may be suitably squeezed in a press by pressure applied coaxially of the spirals in order to form the offset as at 18 in the full length turn 17. Ohviously, other methods may be employed in order to obtain the ofisetting' effect. One such method comprises applying side pressure by a rolle -upon the strip as it is wound to form a spiral.

The band portion 10 having the lugs 11 is then inserted in the inner perimeter of the brush strip. In order readily 'to efiect the latter operation, the band may be inserted the latter operation. It is also not precludedto employ pointed, self-lockingnail elements, which can be driven through the metal of the lugs without drilling, if desired. Subsequently, the points may be nipped olf and the blunted end portions thus formed may be headed over to hold the rivets securely in place. i e V In FIG. 2, but a single rivet is indicated. As shown in FIG. 3, the rivets may be paired as at 23b for purposes of greater security. The number of rivets may be increased, if so desired. The rivets may be replaced by self-threading screws, if preferred. The points of the screws, after they have been'threaded through the lugs 11, may be nipped off for purposes of improvement of finish of the, section. If desired, Tinnerman nuts, such as will be subsequently be described, may be used to hold the screws in place.

In some instances, it may be desired to form the brush section of single turns of brush strip material. For this purpose, a long brush strip in a helix-like coil of proper diameter for the formation of brush sections may be formed By sawing or otherwisecutting'through the channel backing element of this coil along a single line extending longitudinally of the coil, the latter is severed by a single cut into single turn units corresponding in number to the number of turns in thecoil. Each of,

or two or more of these severed turns may then be mounted upon a band having lugs as shown in FIGS. 1

and 2. The turns initially have spiral form of slight pitch, but this is easily overcome and the squarely cut ends are brought into register with respect to each other by the action of the gripping lugs.

The formation of a brush section in this manner is illustrated in FIGS. 4 and 5, in which a single turn 30 of a brush strip is shown as having substantially squarely .cut end portions as at 31. This single turn is mounted upon band 32, having integral opposed lugs 33 projecting radially outwardly from the margins thereof. The two ends of the single turn are held in tightly abutting relationship between the lugs by means such as self-threading screws 34 of well-known type having plain shank portions 34a and threaded tips as at 34b; .These screws .are threaded through the lugs and the side walls 36 of the channel backing of the'brush strip. It will be observed that they bite-into or indent the edges of the side walls ofthe channel backing as indicated at 37, to provide a positive lock holding the ends of the channel backing closely together. The screws also exert a tight clamping action, drawing the lugs 33 upon opposite edges of theband 32 toward each other, whereby to compress 4 the side walls of the channel, holding the fill material in the latter and also assisting in holding the core element 38 of the strip in place, the screws still further assisting in preventing dislodgeme'nt of the end of the core element.

In the form of the invention as shown in FIG. 6, the core element 41 of a brush strip 42 is formed of a ribbon or tape of sheet metal, which is folded to provide a key-hole section having sides 43 closely doubled upon each other. The sides are joined together by intermediate portion 44 of substantially circular shape, which provides a smooth bearing surface within the bight portion of the fill material, and thus reduces the chafing action upon the latter by the core to a minimum.

The ends of the single turn of the brush strip and also the ends of the filamentary core 41, are held in place between the lugs 46 projecting radially from the rigid hand 47 by means of transverse screws 48, which after they are threaded through the lugs, the side walls of the channel backing element and thesides 43 of the core, having their points nipped off. for purposes of improving finish. The screws may be self-threading and held in place by biting into the metal of the lugs or, as shown, conventional Tinnerman nuts 49 of U-shape may be clipped over lugs 46 and function positively to lock the screws in place. I

It is not precluded to insert short lengths of wire or rod 44d of appropriatediameter into the circular portion formed by the intermediate portion 44 connecting the sides 43 of the core element. This may further strengthen the construction and will also prevent the possibilityof fill material working out through the joint between the ends of the core. The sides of the rods may be roughened to increase the security with which they are held in the core. Alternatively, it is also contemplated toinsert short strips (not shown) of sheet metal between sides 43 to bridge the joint 31. The screws 48 will engage and hold the same.

In the form of the invention as illustrated in FIG. 7, the rigid internal band 50 the single turn 51 of brush strip material is cylindrical, that is, the lugs upon the edges thereof are omitted. In order to hold the single turn upon the core, u shaped clips represented by 52 and 52a and being of an internal width corresponding to the width of the band, are provided. These clips are in- 5 'serted within the band 50 and the legs thereof project radially outwardly upon each side to straddle the brush strip element. The latter element corresponds to the strip shown in FIG. 6 and is provided with a core 53 formed fiom a tape or ribbon of sheet steel'or similar 50 metal, folded to key-hole section as shown. 'A section offwire 54 may beinserted in one end of the core and allowed to project into the other end of'the core to hold the two ends together. The ends of the. single turn of brush strip material are held within the branches of the clip 52 by means of a pair of self-threading screws 55,

piercing-the sides of the clip and biting into the side walls of the channel backing element and also biting into or piercing the side portions 56 of the core. Tinnerman nuts could also be used on thescrews, if desired.

As many clips as-may be desired may be employed for purposes of appropriately securing the brush strip to the band 50. The clips may be distributed at uniform intervals in order to obtain proper balance of the assembly. If desired, the lugsll and rivets 23 in FIGS. 1

and 2 may be replaced by U-shaped clips corresponding to clips 52, and screws 55. a

It is not precluded to form the lugs 11 of FIGS. 1, 2, 3,

-co'axially upon artbors or shafts of appropriate diameter,

or if that is not practicable because of the large diameter .The brush sections of this invention may be mounted of the sections, the sections may be mounted upon intermediate adapters in well-known manner and then mounted upon a shaft.

The sections herein shown are relatively inexpensive to construct and at the same time, they are strong and well adapted for operation at high speed or under relatively heavy loads. The forms of the invention as shown are by way of illustration only. It will be apparent to those skilled in the art that numerous modifications may be made therein without departure from the spirit of the invention or the scope of the appended claims.

I claim:

1. A rotary, power-driven brush section comprising a rigid, internal circular band having integral lugs formed at intervals about the edges thereof, the lugs upon one edge being paired with corresponding lugs upon the opposite edge, a brush strip having a channel backing with sides in substantially parallel planes and fill material disposed in the channel backing, the brush strip being spirally wound upon the band between the lugs, the ends of the strip being feathered, whereby the strip provides a substantially flat annulus, the ends of the strip in the spiral being overlapped between a pair of lugs and at least one fastening element piercing both lugs of a pairlof lugs and drawing the lugs together against the side walls, the lugs in the latter pair further engaging the side walls of the backing element, whereby to hold the ends of the spiral in place between the lugs.

2. A rotary, power-driven brush section comprising an internal circular band of metal having integral lugs formed at intervals around the edges thereof and being radially outwardly turned, a brush strip comprising a channel backing having side walls in substantially parallel planes, spirally wound upon the band and being held between the lugs upon opposite edges of the band, the ends of the strip being overlapped and being feathered, the overlapped portions being disposed between a pair of longitudinally opposed lugs, and a pair of rivets extending between the latter pair of lugs and drawing the lugs against the side walls of the channel backing and engaging the side walls of the channel backing element where the ends are overlapped, whereby the latter are positively held in place upon the band.

3. A rotary, power-driven brush section comprising an internal circular band of metal having integral lugs formed at intervals around the edges thereof and being radially outwardly turned, the lugs upon one edge of the band being paired with those upon the other edge, a spirally wound brush strip upon the band and being disposed between the pairs of lugs, said strip having a channel backing element with side walls in substantially parallel planes and fill material disposed therewith, the strip comprising at least one full turn, the ends comprising partial turns which are slightly greater than half-circles, whereby one end portion overlaps the end of the other, the overlapped portion being disposed between a pair of lugs, the full turn of the brush strip having an offset portion disposed between the overlapped end portion of the strip, the end portion being feathered to fit within the recesses formed by the offsetting of the full turn, and means piercing both lugs of the lugs of the latter mentioned pair of lugs and drawing lugs against the side walls and further engaging the side walls of the channel backing element, whereby the latter element is positively held upon the band.

4. A rotary, power-driven brush section comprising a rigid, internal circular band of metal, having integral lugs formed at intervals around the edges thereof and being radially outwardly turned, the lugs upon one edge of the band being paired with those upon the other edge, a spirally wound brush strip upon the band and being disposed between the pairs of lugs, said strip having a chan nel backing element with side walls and fill material disposed in the channel backing element, the strip comprising at least one full turn, the ends comprising partial turns greater than half-circles, whereby one end has a portion overlapping the other, the overlapped portion being disposed between a pair of lugs, the full turn of the brush strip material having an offset portion disposed between the overlapped end portions of the strip, the end portions being feathered to fit within the recesses formed by the ofisetting of the full turn, and securing means piercing the latter mentioned pair of lugs and engaging the side walls of the channel backing element, whereby the latter element is positively held upon the band, said brush strip having a filamentary core disposed within the channel backing element and positively holding the fill material in place in the channel backing element, the ends of the core being hooked about the securing means, whereby to hold the core in place in the channel backing element.

5. A rotary, power-driven brush section comprising a cylindrical band, a circularized brush strip comprising a channel backing having fill material disposed therein, wound around the band and holding clips of U-shape disposed astride the band and having the legs thereof projecting radially outwardly, and fastening means comprising screws transversely piercing opposed pairs of the legs to draw the legs together, whereby to grip the strip.

6. A rotary, power-driven brush section comprising a cylindrical band, a brush strip comprising a single circularized turn of brush strip material, comprising a channel backing having fill material disposed therein, extending around the band and holding clips of U-shape disposed astride the'band and having the legs thereof projecting radially outwardly, and screws extending through said legs and drawing the same together to clamp the channel backing.

7. A circular brush section comprising a circular, internal band constituting a core for the section, a brush strip having two ends and having a channel backing circularly wound upon the band, said backing having double length fill material projecting radially therefrom and being held in place by a filamentary locking core disposed within the bight portions of said fill material, said band having spaced flat lugs radially outwardly projecting about the edges thereof, each lug upon an edge being paired with a lug upon the opposite edge, the lugs upon a side being in a common plane, both ends of said brush strip being disposed between a pair of lugs, and piercing means extending through the outer ends of both lugs of a pair and across the filamentary core and securing the same in place, said piercing means engaging both ends of said brush strip to hold the same between said pair of lugs, and having head means upon both ends securing both lugs together whereby the filamentary core is secured in place against centrifugal force when the section is rotated and whereby the lugs are secured against the sides of the channel backingto secure the brush strip upon the band.

8. A rotary, power-driven brush section comprising a circular, internal band constituting a core for the section, said core having integral flat lugs formed about the edges thereof, the lugs being radially outwardly turned and the lugs upon an edge lying in a common plane, and each lug being paired with a lug upon the other edge, a brush strip circularly wound upon the band and having a channel backing, radially projecting, double length fill material disposed between the walls of the channel backing and being held in place by a filamentary core, and screws transversely threaded through both of a pair of lugs and crossing the filamentary core, said screw having nut means threaded thereupon whereby when the screws are relatively rotated therein, the sides of the channel backing element are drawn toward each other to clamp the channel backing element, said screws biting into the edges of the channel backing element whereby to secure the strip upon the band.

9. A rotary, power-driven brush section comprising an internal, circular band of metal constituting a core, said core having integral flat lugs formed at intervals around each of the edges thereof, the lugs upon opposite edges being paired with corresponding lugs upon the opposite edge, and the lugs upon an edge lying in a common plane and "being radially outwardly turned, and a brush strip having a channel backing with sides in substantially parallel planes, and fill material disposed within the channel backing and radially projecting therefrom, said strip comprising a single turn circularized upon the band and having abutting end portions, the abutting ends of the channel backing element being disposed between a pair of lugs and a pair of piercing fastening elements extending through the latter pair of lugs, one fastening element being disposed in each end of the channel backing element whereby the latter element is held in circularvform when the brush is rotated.

10. A rotary, power-driven brush section comprising a circular band constituting a core for the section and having integrally formed, radially outwardly turned, fiat lugs formed about both of the edges of the band, the lugs on each edge being disposed in a common plane and lugs upon one edge being paired with corresponding lugs upon the other edge, a brush strip having a channel backing element and fill material disposed in said channel backing element, saidstrip comprising a single turn wound about the band with the sides of the channel backing element in substantially parallel planes and being disposed between pairs of lugs, the lugs of one pairl'gripping the ends of the single turn and pairs of fastening elements extending through the abutting ends, the latter of said pairs of-lugs near theprojecting ends thereof, said fasetening elements being screws and nut means upon the band and between the lugs.

11. A rotary, power-driven brush section comprising an internal, circular band constituting a brush core and having a circularized ebrushrstrip comprising-a channel backing having doubled fill material, said channel backing being disp'osed'upon the band, said band having means associated therewith for clamping the brush strip in place and comprising a separate U -snaped clip element having opposed legs straddling the band and abight portion disposed Within the band, and having fastening means piercing both legs'and drawing them together'in clamping engagement with'respect to the side walls of the channel backing element.

12. The rotary, power-driven brush section as defined in claim 11 wherein the fastening means comprises a screw element having nut means threaded thereupon for drawing the legs of the U-shaped clamping element together. V v

13. The construction asdefined inclaim 7 wherein the filamentary locking core is provided at its ends with means engaging the piercing means to hold the filamentary core in place against tensional forces.

References Cited in the tile of this'patent V UNITED STATES PATENTS 612,157 Cook Oct. 11, 1898 1,475,074. McLaughlin Nov. 20, 1923 1,683,618 Hoffman Sept. 11, 1928- 1,706,159 Herold Mar. 19, 1929 2,316,185 Peterson Apr. 13, 1943 2,349,643 Wesemeyer May 23, 1944 2,379,205 5 Wesemeyer June 26, 1945 2,609,559 Peterson Sept. 9, 1952 2,820,235 Nelson Ian. 21, 1958 p FOREIGN PATENTS 347,597 Germany Ian; 23, 1922 555,950 Great Britain Sept. 14, 1943 789,508 Great Britain Jan. 22, 1958