US3585671A - Rotary brush - Google Patents
Rotary brush Download PDFInfo
- Publication number
- US3585671A US3585671A US763238A US3585671DA US3585671A US 3585671 A US3585671 A US 3585671A US 763238 A US763238 A US 763238A US 3585671D A US3585671D A US 3585671DA US 3585671 A US3585671 A US 3585671A
- Authority
- US
- United States
- Prior art keywords
- brush
- bristles
- collar
- bristle
- holder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B7/00—Bristle carriers arranged in the brush body
- A46B7/06—Bristle carriers arranged in the brush body movably during use, i.e. the normal brushing action causing movement
- A46B7/08—Bristle carriers arranged in the brush body movably during use, i.e. the normal brushing action causing movement as a rotating disc
Definitions
- a rotary end brush or cup brush is provided with a durable collar surrounding the bristles where they emerge from the bristle holder; the collar having a smooth convexly curved bristle support surface (e.g., as an O-ring) for supporting the bristles when they flare during brush rotation; the bristle support surface being elastomeric and having a hardness in excess of about 50 Shore A durometer; the collar being reinforced against expansion (e.g., by locating it at least partially within the bristle holder); and the bristle holder being constructed of either metal or plastic.
- This invention relates to rotary brushes and more particularly to end brushes and the like which are suitable for being driven in power machinery.
- End brushes or cup brushes are a category of brushes generally characterized by the fact that their bristle material, such as wire bristles for example, extends generally parallel to the axis of rotation of the brush and tends to are radially outwardly when the brush is driven at high speeds in power machinery.
- An important factor reducing the effective life of these brushes has been their tendency to undergo long bristle fracture i.e., breakage of the bristles at the point where they emerge from the bristle holder. When driven at high speeds, long bristle fracture often renders many of these brushes useless long before the bristles have worm down to unusably short lengths.
- Another brush has a length of plastic tubing covering the bristle holder and extending a short disance beyond the rim of the holder, with a narrow foam collar inserted beneath the tubing to encircle and engage the bristles where they emerge from the bristle holder.
- An important advantage of the present invention is that it provides a collar which supports the ared bristles away from the rim of the bristle holder, and that this collar presents a bristle support surface that permits the bristles to slide freely along the collar and is also very durable.
- Other collars such as have been constructed of foam, for example, may provide a satisfactory cushion for the bristles and also prevent the bristles from bending sharply at the cup rim, but such collars exert an undue drag upon the bristles and, as a result, not only may tend to cause bristle fatigue but are quickly damaged or destroyed by the abrasive rubbing action of the bristles.
- ⁇ It is another object of my invention to provide a novel power driven rotary brush in which the holder may be constructed of a plastic.
- FIG. 1 is an elevational view of a rnetal cup and brush constructed in accordance with my invention.
- FIG. 2 is a transverse section taken on the line 2 2 of FIG. 1.
- FIG. 3 is a longitudinal section taken on the line 3 3 of FIG. 1.
- FIG. 4 is a transverse section taken on the line 4-4 of FIG. 1.
- FIG. 5 is an exploded view of the brush shown in FIG. 1 prior to assembly.
- FIG. 6 is an elevational view with a portion shown in section of a plastic cup end brush constructed in accordance with my invention.
- FIG. 7 is a transverse section taken on the line 7-7 of FIG. 6.
- FIG. 8 is an exploded View of the brush shown in FIG. 6 prior to assembly.
- FIGS. 1-5 show a rotary end brush 1 having a metal holder 2 with a cup shaped bristle receiving portion 3 and a stem or shank portion 4 extending from the base 7 of the cup 3.
- the shank 4 is for mounting the brush 1 in an appropriate chuck in power machinery so that the brush 1 may be driven at high speeds e.g., on the order of 8-25,000 r.p.m.
- the cup shaped portion 3 of the holder 2 has rim 5, side wall 6 and base 7 portions.
- One end of a bundle of bristles 8 is disposed in the cup shaped portion 3 of the holder 2, and the other end extends from the cup so that the bristles extend generally in a direction parallel to the axis of the shank.
- the end of the bristles 8 held in the cup 3 is bound by a metal ring 9, and the bound bristles are held securely in the cup 1 by crimping the cup rim 5 inwardly.
- Other conventional modes of bristle anchoring may be employed such as by looping the bristles about a ring held in the bottom of the cup, or by setting the bristles in solder.
- a toroidal rubber collar 10 encircles the bristles 8 where they emerge from the cup portion 3 of the holder f 2, and is held there by the inwardly crimped cup rim 5.
- Rubber rings suitable for use as collars in the brush of the present invention are currently sold for use as sealing rings for valves and the like and are known generally in the trade as O-rings.
- O-rings Rubber rings suitable for use as collars in the brush of the present invention are currently sold for use as sealing rings for valves and the like and are known generally in the trade as O-rings.
- the O-ring collar 10 is formed of an elastomeric material, preferably a copolymer of butadiene and acrylonitrile, with a hardness of about 70 Shore A durometer although other elastomeric materials may be employed.
- the surface of the O-ring 10 is very smooth and its width is on the order of 1/8 so that the portion 11 of the collar 10 that supports the bristles when they flare (hereinafter referred to as the bristle support surface 11) has a radius of curvature of about 1/16".
- the bristle support surface 11 should have a radius of curvature of not less than about 1/32" or the bristles will undergo relatively sharp ftexing when they flare across the collar and an undue amount of bristle fatigue ensues. A too small radius of curvature also leads to reduced collar life since it results in a smaller bristle support surface and increased bristle pressure on that surface.
- both the shape and composition of the collar are very important to the longevity of the brush.
- a weak collar e.g., one that is of too soft material or that has a low abrasion resistance or, even though a proper elastomer be employed, if the collar has sharp edges that are susceptible to being cut by the bristles
- a collar must be constructed with a bristle support surface that takes into account not just its effect upon the bristles, but also the effect of the bristles upon it.
- FIGS. 6-8 inclusive there is shown a rotary end brush 12 constructed in accordance with the principles of the present invention, and having a holder 13 with a .polymeric or plastic cup shaped bristle receiving portion 14.
- the cup shaped portion 14 has base 15, side wall 16 and rim portions 17.
- the base 15 of the cup 14 is molded onto a metal shank or stem 18.
- the metal shank 18 has disc-like anchor fiange 19 over which the plastic cup 14 is molded and that ange 19 is provided with a number of bosses 20 to prevent the shank 18 from twisting in the plastic.
- the shank 18 is for mounting the brush 12 in the jaws of an appropriate chuck to drive the brush in power machinery at high speeds e.g., on the order of 8-25,000 r.p.m.
- One end of a bundle of bristles 21 is bound by a metal ring 22 and disposed in the holder cup 14 and the other end extends from the cup 14 so that the bristles lie generally in a direction parallel to the axis of the shank 18.
- Epoxy may be employed to cement the Ibristle bundle 21 in the cup and the binding ring 22 and/or the cup 14 may be provided with radially extending flanges (not shown) which t into corresponding slots (not shown) on the opposed surface and act to reinforce the bristle bundle 21 against twisting in the cup 14.
- a toroidal rubber collar 23 (preferably an O-ring) having a bristle support surface 24 encircles the bristles 21 where they emerge from the cup portion 14 of the holder 13.
- the plastic cup 14 is heated to make it deformable, whereupon its rim 17 is bent inwardly to assist in holding O-ring 23 and bristles 21 in place.
- Requirements for collar design in plastic cup brushes of the present invention are essentially the same as for the metal cup brushes of the invention.
- the polymeric cup 14 is formed from a solid synthetic resin, preferably nylon.
- Nylon has been chosen, among other reasons, for its good mechanical properties and for its high heat resistance.
- the suitability of the brush of the present invention for construction of its cup portion from plastic is an important advantage.
- the bristle holder having a plastic cup is less expensive and lighter weight than comparable metal holders. It is also attractive and protects the workpiece from accidental contact of the holder with the workpiece during the brushing operation.
- the bristles in both metal and plastic cup end brushes of the types 1 and 12 shown in the drawings are of steel wire between about .005" and .020 in diameter and the cup portions of such end brushes have interior diameters between about 1/2" and 1%".
- the principles of the present invention have applicability, however, to larger cup brushes of the type shown, for example, in U.S. Pat. No. 2,062,047.
- the shank or other portions serving to couple the brush to power machinery may also be constructed of polymeric material and may be of unitary construction with the bristle receiving holder portions at a substantial savings in cost, although generally higher cost plastics such as certain glass filled compounds are usually employed to obtain the desired strength.
- An improved rotary brush having a holder with a bristle receiving portion, a stem portion extending from the base of said bristle receiving portion or other means for mounting and driving the brush in power machinery, and a -bundle of bristles with one end of said bundle mounted in said bristle receiving portion and with the other end extending therefrom so that when said brush is driven in rotation about its axis, said bristles tend to are radially outwardly from the axis of rotation of said brush; said improvement comprising a collar encircling said bundle of bristles where they emerge from said holder, said collar having a smooth convexly curved bristle support surface for supporting said bristles when they iiare radially outwardly during brush rotation, said collar being of an elastomeric material with a hardness in excess of about 50 Shore A durometer, and means for reinforcing said collar against substantially expansion during use of said brush in power machinery.
- a rotary brush comprising a holder with a cupshaped bristle receiving portion; a stem portion extending from the base of said cup-shaped portion for mounting and driving the brush in power machinery; a bundle of bristles with one end of said bundle mounted in said cupshaped portion and the other end extending from said cup-shaped portion so that when said brush is driven in rotation about the axis of said stem, said bristles tend to ilare radially outwardly from the axis of rotation of said brush; and a collar encircling said bundle of bristles where they emerge from said holder, said collar having a smooth convexly curved bristle support surface for supporting said bristles when they flare radially outwardly during brush rotation, said collar being of an elastomeric material with a hardness in excess of about Shore A durometer, at least a portion of said collar located within said bristle receiving portion of said holder to prevent substantial expansion of said collar during use of said brush in power machinery.
Landscapes
- Brushes (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US76323868A | 1968-09-27 | 1968-09-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3585671A true US3585671A (en) | 1971-06-22 |
Family
ID=25067262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US763238A Expired - Lifetime US3585671A (en) | 1968-09-27 | 1968-09-27 | Rotary brush |
Country Status (3)
Country | Link |
---|---|
US (1) | US3585671A (en) |
DE (1) | DE1948868A1 (en) |
GB (1) | GB1279645A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4884849A (en) * | 1988-12-12 | 1989-12-05 | Better Health Concepts Co Inc. | Apparatus for manufacture of end brush |
US5464275A (en) * | 1992-12-11 | 1995-11-07 | Jason, Inc. | End brush and method of making |
US5755003A (en) * | 1992-12-11 | 1998-05-26 | Jason, Inc. | End brush and method of making |
US20040187244A1 (en) * | 2003-03-26 | 2004-09-30 | Giertz Norman Paul | Twisted tuft end brush and method of making |
US20090260171A1 (en) * | 2006-04-10 | 2009-10-22 | Sajakorpi Oy | Brush element |
US20100186771A1 (en) * | 2006-06-02 | 2010-07-29 | Fariborz Rahbar-Dehghan | Portable dusting tool |
-
1968
- 1968-09-27 US US763238A patent/US3585671A/en not_active Expired - Lifetime
-
1969
- 1969-09-23 GB GB46866/69A patent/GB1279645A/en not_active Expired
- 1969-09-26 DE DE19691948868 patent/DE1948868A1/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4884849A (en) * | 1988-12-12 | 1989-12-05 | Better Health Concepts Co Inc. | Apparatus for manufacture of end brush |
US5464275A (en) * | 1992-12-11 | 1995-11-07 | Jason, Inc. | End brush and method of making |
US5755003A (en) * | 1992-12-11 | 1998-05-26 | Jason, Inc. | End brush and method of making |
US20040187244A1 (en) * | 2003-03-26 | 2004-09-30 | Giertz Norman Paul | Twisted tuft end brush and method of making |
US20090260171A1 (en) * | 2006-04-10 | 2009-10-22 | Sajakorpi Oy | Brush element |
US20100186771A1 (en) * | 2006-06-02 | 2010-07-29 | Fariborz Rahbar-Dehghan | Portable dusting tool |
Also Published As
Publication number | Publication date |
---|---|
DE1948868A1 (en) | 1970-08-20 |
GB1279645A (en) | 1972-06-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ADVANCE BRUSHES, INC.,STATELESS Free format text: CHANGE OF NAME;ASSIGNOR:MANUFACTURERS BRUSH CO., THE;REEL/FRAME:004843/0114 Effective date: 19810610 Owner name: MILWAUKEE BRUSH MANUFACTURING COMPANY, THE Free format text: MERGER;ASSIGNOR:ADVANCE BRUSHES INC., AN CORP. OF OHIO;REEL/FRAME:004775/0713 Effective date: 19861229 Owner name: ADVANCE BRUSHES, INC. Free format text: CHANGE OF NAME;ASSIGNOR:MANUFACTURERS BRUSH CO., THE;REEL/FRAME:004843/0114 Effective date: 19810610 Owner name: MILWAUKEE BRUSH MANUFACTURING COMPANY, THE, A CORP Free format text: MERGER;ASSIGNOR:ADVANCE BRUSHES INC., AN CORP. OF OHIO;REEL/FRAME:004775/0713 Effective date: 19861229 |