US2963730A - Brush element - Google Patents

Description

Dec. 13, 1960 B. E. NELSON BRUSH ELEMENT Filed April 9, 1958 INVENTOR.

BROOKS E. NELSON @JMW/#XM ATTORNEYS j essere@ Patented Dee. i3, i950 Fice BRUSH ELEMENT Brooks E. Nelson, Chagrin Falls, Chio, assignor to The Osborn Manufacturing Company, Cleveland, Ohio, a corporation of Ohio Filed Apr. 9, 1958, Ser. No. 727,461

17 Claims. (Cl. 15-182) This invention relates as indicated to a novel brush element, and more particularly to an improved form of brush strip adapted for circularization about a relatively small radius and including spacing means facilitating the outward ow of air for Ventilating and other purposes. This application is a continuation-in-part of my co-pending application Serial No. 452,320, led August 26, 1954, now abandoned.

The brush strip may be of the general type shown and described in Peterson Patent 2,303,386 and may preferably be of the type shown and described in Nelson and Peterson Patent 2,626,414, having transverse teeth extending from one side only of the channelform back to secure the elongated brush material retaining element thereunder. It is well known to mount annular brush elements, which may be formed of single turns of brush strip with the brush material extending generally radially outwardly for example, upon appropriate adapters having arms which support and slightly space apart adjacent brush sections. The radially outward flow of cooling air is facilitated by this arrangement, and adequate ventilation may be obtained. When mounted upon a proper hub, various uids may be fed to the interior thereof before distribution to the brush face under the influence of centrifugal force. Such uids may include entrained abrasive particles and other media for application to the Work.

When, however, the brush strip is circularized in the form of a helix comprising a number of turns, it is apparent that the usual adapters are not suitable for mounting the same, and such helically wound brush element will ordinarily be mounted directly upon a corresponding arbor or upon a cylindrical hub adapted itself in turn to be mounted upon the arbor. lt is possible to provide longitudinal grooves in the hub surface as well aS apertures in the hub so that fluid may be conducted to the inner periphery of the helical brush element. It is, however, necessary that the adjacent turns of the helix be somewhat spaced apart to permit further outward flow of such uid, and in the past it has been known to provide radial ribs and grooves in the sides ofthe brush strip channel back to facilitate such ow. It has been found, however, that when the brush strip is circularized, and particularly when it is circularized about a relatively small radius, such radial ribs and grooves tend to be stretched out, particularly adjacent the radially outward lips of the channel sides with the result that such lips of adjacent turns of the brush back contact each other substantially continuously.

It is accordingly a principal object of my invention to provide an improved brush strip in which the channel back is deformed in a novel manner to ensure adequate spacing of adjacent turns of `a brush strip helix even when such helix is of relatively small diameter.

Another object is to provide a tear-resistant brush strip channel back having teeth punched in from one side only but nevertheless especially effective to secure an elongated brush material retaining element thereunder.

Other objects of the invention Will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, said invention then comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and the annexed drawing setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principle of the invention may be employed.

In said annexed drawing:

Fig. 1 illustrates somewhat diagrammatically a length of brush strip in accordance with my invention circularized to form a helix adapted to be mounted upon a cylindrical hub;

Fig. 2 is La transverse section through two adjacent turns of the helix showing one embodiment of my invention;

Fig. 3 is a plan View of a short length of metal tape having teeth punched up therefrom and indentattions formed Itherein prior to shaping to channel form to serve as one embodiment of my brush strip back;

Fig. 4 is a transverse section through two adjacent turns of helically wound brush strip similar to Fig. 2 but showing another embodiment of my invention;

Figs. 5 and 6 are fragmentary detail views on an enlarged scale illustrating preferred shapes and proportions of brush strip spacing protuberances adapted to be deformed in the side of the brush strip channel back; and

Fig. 7 is a transverse section through brush strip such as that illustrated in Fig. 2 but having a modied form of tooth. It also illustrates employment of a body of plastic resin within the brush strip back further -to assist in securing the brush material therein and in maintaining the elongated bristle retaining element beneath the teeth.

Referring now more particularly to such drawing, the brush strip of my invention may comprise a sheet metal channelform back l having teeth 2 punched in from one side of the channel back only (Fig. 2) to overlie the elongated retaining element or wire 3 about which the brush material 4 is doubled and by which such material is secured in the channel back. The teeth may desirably be of the type disclosed in Peterson Patent 2,303,386, being shaped to leave corresponding apertures (such as 5 in Fig. 3) in the channel side having their edges adjacent the channel lip 6 parallel to such lip. This considerably reduces danger of tearing when the brush strip is circularized into helical conformattion as generally indicated in Fig. l, for example.

Outwardly protruding Irelatively shallow dimples 7 are formed in the other side of the channel back from the teeth 2 to space adjacent turns of the helically wound brush strip slightly apart :as shown. It Will be appreciated that such protuberances or dimples are equally effective to space apart adjacent individual turns of the brush strip when the latter are mounted side by side upon an appropriate hub. The protuberances 7 will preferably be of the form shown in Fig. 5 or alternatively in the form '7' shown in Fig. 6, being of elongated oval or rectangular form transversely of the brush strip back 1 and having smoothly rounded contours to minimize concentrations of stress. Such protuberances resist further deformation when the brush strip is circular-ized as shown in Fig. l, for example, andare not likely to cause tearing of the channel edge 6 under such circumstances. They are spaced both from the channel lip and the channel bottom, but may desirably extend about one-half the width of the channel side. When brush strip is circularized, it is, of course, necessary for the channel edges or lips to stretch relative to the inner periphery of the resultant brush element, and uniform stretching is interfered with if the protuberances are too closely adjacent the channel lip, By locating such protuberances asindicated, however, slightly closer the channel lip than to the channel bottom, they are etective toV resist the tendency of the channel lips of adjacent turns of brush strip Vto bear Yagainst each other in substantially continuous contact.

When the protuberances '1' are utilized in the Fig. 2 form of brush strip, they will preferably not be directly opposite the teeth 2, but instead will be staggered relative thereto as indicated in Fig. l.

While I consider the features of my invention to be of particular importance whenembodied in brush strip of the generale-type shown in Figs. 2 and 7 where teeth project Vinwardly from one -side of the channel backvonly, such brush strip being especially adapted -for circtilarization about a relatively small radius, I may on occasion also employ the spacing .protuberances 7 in brush strip of the type .disclosed in Peterson Patent 2,303,386 Vand shown in cross-section in Fig. 4. Here, pairs of vteeth 8 and 9 are punched inwardly from opposite sides of ythe channel back to overlie and secure the elongated brush material retaining element 3, and the protuberances 7 are formed in one side of the ,channel back intermediate adjacent teeth 8. In Fig. 3, there is shown a-s'ection of flat metal strip or rtape from which the teeth 3 and 9 have been struck up and in which the protuberances 7 have been formed (in the opposite direction) prior to shaping such tape to channel form as seen in Fig. 4, for example. It may be noted that in the Fig. 3 embodiment the .teeth 8 and 9 are uniformly staggered or oiset and the protuberances 7 are located equidistant between adjacent apertures left in the metal strip by punching up of the teeth 8. This arrangement further tends to reduce points of concentration of stress when the brush strip is subsequently circularized as shown in Fig. l, for example.

My new brush strip, Whether helically wound to form a plurality of continuous turns or circularized and severed to form individual turns, may be mounted upon a hollow cylindrical sheet metal hub such as l() with adjacent turns slightly spaced apart by the protuberances 7. Since such protuberances are preferably on one side only of the brush strip back, there is no chance of vtwo such protuberances being directly opposed to one another with consequent uneven spacing of the turns. rThe sheet metal hub lt) may be formed with a plurality of longitudinally extending external grooves 11 having openings such as l2 placing the grooves in communication with the interioro'i the hub. Other apertures such as 13 may be provided in the shell of the cylindrical hub proper through which fluid may also pass from the interior of the hub to the spaces between the turns of brush strip, such iiuid owing radially outwardly between the slightly spaced apart turns of the chanuelform brush back under the inuence of centrifugal force. A wide variety of hollow hubs may be utilized in the general manner indicated to provide for fluid flow, particularly Ventilating air ow, through the brush assembly.

The further modification of my invention illustrated in Fig. 7 resembles in certain basic aspects the construction of Fig. 2, the teeth 14 being punched in from one side only of the channel back with the outward protuberances 7 on the other side of the back only. While densely packed brush material 4 will assist in maintaining retaining wire 3 beneath teeth 2 of the Fig. 2 construction, it is often highly advantageous to provide a notched or hooked underside of the `tooth 14 to engage and secure the wire 3 against lateral shifting and possible escape. Such lateral displacement of the retaining wire 3 may also be guarded against by providing a suitable elastomeric composition 1S such as neoprene within the channel back and filling the latter to an extent at least suiiicient to embed the wire 3 as shown in Fig. 7. In some circumstances, other types of resins or synthetic plastic compositions may be preferably employed such as the `epoxy resin compositions, nylon, etc. Such material, of course, also embeds or bonds together portions of the brush material within the channel back, further securing the latter against withdrawal.

It will be seen from -the foregoing that I have provided novel brush strip particularly suited for circularization about a relatively small radius without danger of tearing the edges of the sheet metal channel back and yet ensuring that adjacent turns will be sui'liciently spaced 'apart to permit fluid -flow therebetween.Y -The channel back may be of any suitable sheet material, Vordinarily metal, including steel, stainless steel, aluminum and brass. The brush material may be any such material known in the art, including horsehair, Tampico fiber, metal wire, cord, plastic lcoated wire, .plastic coated cord, plastic coated glass ber, and fabric'bul materials, The elongated retaining elernent 3 Will `ordinarily be steel wire, vbut may be-of brass -or' other material depending on the operating conditions .to be encountered. VIt will be apparent that my new brush strip is readily adapted for manufacture in the usual manner on continuous automatic machines.

The hollow spacing protuberances 7 and 7" will .preferably be hat crowned as shown to aord greater area of contact with the opposed channel side of the adjacent Y turn. At least oneof the outer dimensions of the spacing protuberances will preferably 4be slightly greater than the size of the opening 5 left by a tooth in the channel side, to prevent nesting.

Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in any of the following claims or the equivalent of such be employed.

I therefore particularly point out and distinctly claim as my invention:

l. In brush strip having an elongated sheet metal channelforrn back, a wire retaining element disposed lengthwise within such channel, brush material doubled about said wire and protruding from said back, and teeth punched in from both channel sides closely overlying and securing said wire; protuberances projecting outwardly from one channel side only, said protuberances being staggered relative to said teeth and spaced both from the bottom of said back and from the adjacent channel lip.

2. VThe brush strip of claim l deformed into a plurality of closely adjacent turns spaced Yby said protuberances.

3. In brush strip having an elongated one-*piece channel back and brush material secured therein and protruding therefrom; protuberances integral with and projecting outwardly from one channel side only, said protuberances being spaced from each Aother longitudinally of said back and spaced both from the bottom of said back and from the adjacent channel lip.

4. The brush strip of claim 3 deformed into a plurality of closely adjacent turns spaced by saidprotuberances.

5. In brush strip having an elongated one-.piecechannel back and brush material secured therein and protruding therefrom; ,protuberances integral. with and projecting outwardly from one channelV side only. said protuberances being spaced from each other longitudinally vof said back and also spaced from the adjacent channel lin.

6. In brush strip having lan elongated one-piecechannel back and brush materialsecured therein and protruding therefrom; hollow protuberances integral with and projecting outwardly from one side only of such channel, such'channel having unbroken straight lips, said protuberances being spaced both from the bottom of said back and from the adjacent channel lip.

7. Turns of brush strip in accordance with claim 6 disposed in close side-by-side relationship but slightly spaced by said protuberances.

8. In brush strip having an elongated sheet metal channelform back, a wire retaining element disposed length- Wise Within such channel, brush material doubled about said wire and protruding from said back, and teeth punched in from one channel side only closely overlying and securing said wire; a notch in the underside of each said tooth engaging said wire.

9. The brush strip of claim 8, wherein a body of plastic is provided within said back embedding said brush material and wire.

10. The brush strip of claim 8, including protuberances projecting outwardly from the other channel side only.

l1. The brush strip of claim 8, including protuberances projecting outwardly from the other channel side only, said protuberances being staggered relative to said teeth and spaced both from the bottom of said back and from the adjacent channel lip, and said protuberances having flat crowns adapted to Contact the sides of adjacent turns of said brush strip to space them apart.

12. In brush strip having an elongated one-piece channel back and brush material secured therein and protruding therefrom; protuberances integral with and projecting outwardly from one channel side only, said protuberances being spaced from each other longitudinally of said back and also spaced from the adjacent channel lip, and said protuberances having at crowns adapted to contact the sides of adjacent turns of said brush strip to space them apart.

13. In brush strip having an elongated sheet metal channelform back, a wire retaining element disposed lengthwise within such channel, brush material doubled about said wire and protruding from said back, and teeth punched in from a channel side closely overlying and securing said wire; hollow protuberances projecting outwardly from one channel side only spaced both from the bottom of said back and from the corresponding channel lip, said protuberances having at crowns.

14. In brush strip having an elongated sheet metal channelform back, a wire retaining element disposed lengthwise within such channel, brush material doubled about said wire and protruding from said back, and teeth punched in from a channel side closely overlying and securing said wire; hollow protuberances projecting outwardly from one channel side only spaced both from the bottom of said back and from the corresponding channel lip, said protuberances having liat crowns extending approximately one-half the Width of the channel side.

15. The brush strip of claim 14, wherein said protuberances are of general oval shape widthwise of the channel side.

16. The brush strip of claim 14, wherein said pro tuberances are of general elongated rectangular shape widthwise of the channel side.

17. In brush strip having an elongated sheet metal channelform back, a wire retaining element disposed lengthwise within such channel, brush material doubled about sad wire and protruding from said back, teeth punched in from both sides of said channel back evenly staggered from side to side closely overlying and securing said wire, and flat crowned hollow protuberances projecting outwardly from one channel side only, said lprotuberances being equidistant between apertures left in said latter channel side by said teeth punched therefrom.

References Cited in the le of this patent UNITED STATES PATENTS 955,738 Abrahamson Apr. 19, 1910 1,631,998 Carman June 14, 1927 1,817,176 Curtis Aug. 4, 1931 1,829,665 Mertes Oct. 27, 1931 2,320,384 Peterson June 1, 1943 2,349,644 Wesemeyer May 23, 1944 2,409,309 Peterson Oct. 15, 1946 2,616,228 Schlegel Nov. 4, 1952 2,626,414 Nelson Jan. 27, 1953 2,821,729 Van Clief Feb. 4, 1958 2,826,776 Peterson Mar. 18, 1958

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