US3616484A - Rotary brush with collar - Google Patents
Rotary brush with collar Download PDFInfo
- Publication number
- US3616484A US3616484A US17435A US3616484DA US3616484A US 3616484 A US3616484 A US 3616484A US 17435 A US17435 A US 17435A US 3616484D A US3616484D A US 3616484DA US 3616484 A US3616484 A US 3616484A
- Authority
- US
- United States
- Prior art keywords
- brush
- collar
- bristles
- bundle
- cup
- 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 power driven rotary end brush having a unitary tubular collar mounted on the bristle holding element and encircling the bundle of bristles in the region where the latter emerge from the holder, such collar being resiliently deformable and pre-stressed to exert an active controlled pressure grip within a predetermined pressure range upon lsuch bundle of bristles in both static and dynamic conditions of the brush.
- This invention constitutes an improvement in power driven rotary brushes of the general type disclosed in U.S. Pat. No. 2,989,767 to V. K. Charvat, dated June 27, 1961.
- the principal object of this invention is to provide a rotary end brush having a unitary tubular collar mounted on the bristle holding element and encircling the bundle of bristles in the region where the latter emerge from the holder, such collar being pre-stressed Iand resiliently deformable to exert an active controlled pressure grip on the bundle of bristles within ⁇ a predetermined desired pressure range regardless of whether such brush is in dynamic or static condition.
- Another object is to provide such brush collar which will neither tear nor take a set under conditions of use.
- Still another object is to provide such brush in which the collar is effective to prevent the brush from becoming out of balance in operation as well yas actively to support the bristles with the desired degree of pressure at all stages of opening Iand closing of the brush under the action of centrifugal force.
- a further object is to provide such collar which will be effective to constrict the bundle of bristles in static condition so that the width of the brush face will be no greater than the diameter of the brush body comprising the holder and collar mounted thereon.
- FIG. 1 shows a power driven rotary end brush in accordance with the present invention on an enlargd scale, the holder portion of the brush being broken away in longitudinal diametral section, and the ultimate dynamic position of the brush ⁇ fill material when the brush is rotated at high speed being indicated by dot and dash line.
- end brush fas shown comprises a cup shaped holder 1 which may, for example, be of steel or some other metal, with a short shank or stem 2 extending coaxi'ally from the bottom thereof.
- Such stem is adapted to be gripped in an appropriate chuck or collet for mounting in a power driven tool such as conventional hand-held air-operated tools ladapted to drive the brush at between y8,000 and 10,000 r.p.m., -for example.
- a bundle or brush bristle material such las ne wire bristles 3 is passed through an annular sheet metal ring 4 and rebent around the latter so that both ends of the bristles extend in the same direction side by side.
- This ring with the bristles extending therefrom is inserted within the cup shaped holder 1 and the lip portion 5 of such holder is compressed to lassist in securing the bundle of bristle material therein.
- the corresponding edge 6 of the inner bristle retaining ring 4 will normally be flanged slightly inwardly through transmitted pressure, likewise as shown.
- a preferred bristle material for typical brushing operations comprises fine carbon steel wire bristles having ⁇ a diameter on the order of .005 inch.
- the plastic sleeve or collar 7 will desirably be of the indicated thickness for the following listed standard brush sizes:
- the plastic sleeve 7 may desirably be of neoprene (polychloroprene) and will be substantially elastically stretched to t over and grip the exterior of cup 1 as shown; a cement or other bonding material will desirably be employed as there is some tendency for the sleeve to be pushed back by the force of the radiating bristles in use. Suitable cements include vinyl base adhesives such as Pliolite 'and Pliobond supplied by The Goodyear Tire and Rubber Co.
- the inward slope of lip 5 of the holder cup assists in resisting such rearward movement of the sleeve.
- the elastic material of which such sleeve is formed should desirably be c-apable of elongating in an amount of and subsequently returning to its original dimension and condition. It should also have good shelf life, meaning that it should not appreciably deteriorate in a period of one year despite the fact that the sleeve is in a moderately stretched condition.
- the sleeve material must ⁇ also be abrasion resistant, although slow erosion of the inner edge of the collar lip 'S is unobjectionable land expected.
- such collar material should desirably have a tensile strength of from about 1000 to 5000 p.s.i. and preferably of from about 2,000 to about 2,500 p.s.i., an elongation of about 200% with no tendency to tear, and a Durometer reading of from about 45 to about 65 A scale and preferably of 50 to 60 A scale.
- the plastic sleeve or collar may also be of various other suitable elastomeric materials such as polyurethane rubber, butyl rubber, natural rubber, and polysulphide rubber.
- the lip 8 of collar 7 may extend from about 1/8 inch to about 1A inch beyond the lip 5 of the holder cup l, and ordinarily it should project about 3/16 inch therebeyond.
- Such plastic sleeve 7 of unitary solid wall neoprene tubing will be distended to fit over cup 1 and the portion of such tubing projecting beyond the lip of the cup is elastically constricted actively to grip the bundle of bristles 3 with a pressure of from lbs. to 50 lbs. per square inch, and preferably about v lbs. per square inch, in the normal static condition of the brush.
- the bristles When the brush is rotated in use, the bristles will tlare outwardly under the influence of centrifugal force and will assume the generally radial position 3' indicated in dot and dash line if such brush is rotated at a suciently high speed.
- the plastic collar When the brush material 3 thus assumes a substantially radially outwardly extending position the plastic collar will of course be flexed outwardly as shown to the position 8 and such ilexed collar should desirably impose a pressure of not more than 75 lbs. per square inch, and desirably not more than 50 lbs. per square inch, against the layer of brush bristle material in such outwardly flared condition.
- Such pressures may be measured, as a practical matter, by engaging lip 8 with a small hook attached to an appropriate scales and applying sucient tension thereon to bring the lip into the respective positions illustrated in the drawing.
- the collar should not gap when squeezed while the brush is in static condition.
- the length of plastic tubing 7 mounted upon the outer surface of cup 1 should desirably be at least as long as the portion of such tubing extending beyond the lip of the cup and the plastic sleeve will desirably extend the entire length of the cup portion of the holder as shown in the drawing to prevent damage to a workpiece if the side of the holder should accidentally touch such work in use.
- the active squeezing action of the collar upon the bundle of brush material 3 is desirably suiiicient to compact such bundle so that the diameter of the brush face does not exceed the diameter of the holder with the sleeve mounted thereon; it is thus possible to insert the brush into any opening which is suiciently wide also to receive the holder portion of the tool.
- the projecting portion of the collar is resilient- 1y expanded where actively gripping the bundle or tuft of brush material only enough to cause it to exert sufriciently constricting force upon such bundle to keep the latter thus firmly compacted when the brush is in static condition.
- the collar 7 is formed of a section of unitary plastic tubing rather than wraps of plastic tape or the like inasmuch as it has been found that such tubing tlexes more uniformly and also avoids localization of stress in use so that there is considerably less likelihood of tearing. As shown in the drawing, such collar bridges the lip of the cup and first engages the bundle of brush bristle materials at a point very slightly beyond such lip. As noted above, the collar constricts the bundle of brush material so that the brush may be inserted even into rather small diameter holes and openings, and the brush material then flares outwardly to varying degrees in use depending upon the speed of rotation of the brush.
- the action of the elastomeric collar in thus supporting such brush bristle material is a function not only of the tensile strength of the collar material, but is dependent upon the co-acting resisting forces of bending and compression.
- these referred-to individual forces must adjust to various amounts of fill flare due to brush speed and to compensate for the conditions of non-symmetrical ll deflections attributable to contact with the work.
- a bridle of the proper physicals if it consists of a unitary structure of suicient length to allow the fixed end to be positively anchored on the cup shank.
- These requirements are vital in order to introduce the desirable damping effect since collar structural configuration, size and location inuence the amount of restraining force and its ability to keep the ll centerline as continually coincident with the axis of rotation as possible. This geometry of shape determines the efficiency of the collar.
- the bridle must maintain its axial position to assure the proper length at the Working end, otherwise its influence can be appreciably modified from gross over-control to no effective restraint.
- the material must be capable of yielding to the greatest load without tearing and yet avoid overpowering influence at low speed or light pressure.
- the bridle must be of a dimension (length beyond the cup) such that it will exert enough pressure at static conditions to confine the ll material suciently to close the brush face from its flare position to within the shank OD approximately. So, as above noted, even when the brush is in static condition the collar is prestressed sufficiently to exert an active, even though modest, clamping force upon the bundle of brush material. In this respect it differs considerably from the action of prior art collars which merely tightly or unyieldingly support the bundles of bristles.
- the resisting force of the bridle consists essentially of a tensile restraint since compression and bending do not enter the picture until the bridle size and deformation expands beyond a cylindrical configuration larger than that of the portion embracing the shank.
- the stress or load of the collar on the fill material is substantially uniformly distributable around the 360 of the brush if the bridle is concentrically located by attachment to the shank.
- the constraining force exerted by the collar against the ilaring brush bristles increases steadily as the latter flare more and more towards the radially uttermost position. But nowhere does the bridle present other than a yielding large radius cushioned surface.
- the collar of the brush of the present invention since it actively clamps the brush bristles in the static condition, exerts a pressure thereon which is far less variable stated as a percentage of maximum pressure (with the bristles fully flaring) than the pressure of prior art tight collars which build up rapidly from approximately zero.
- a rotary end brush having a cup-shaped holder and a bundle of brush bristles secured therein and extending therefrom; an elastomeric plastic collar comprising a unitary section of tubular plastic material tightly encircling said holder and extending beyond the lip of said cup also to encircle and actively grip said bristles, said collar having a tensile strength between about 1000 p.s.i.
- said collar being resiliently distended where thus encircling said holder thus tightly to grip the latter and also being resiliently distended actively to grip said bundle of bristles with a pressure of not less than 15 lbs. per square inch to compact the latter when said brush is at rest, said collar being further resiliently distensible continuously actively to engage Said bundle of bristles with a pressure not in excess of 75 lbS. per square inch as said bristles flare in a radially outward direction under the influence of centrifugal force as said brush is rotated in use.
Landscapes
- Brushes (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1743570A | 1970-03-09 | 1970-03-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3616484A true US3616484A (en) | 1971-11-02 |
Family
ID=21782573
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17435A Expired - Lifetime US3616484A (en) | 1970-03-09 | 1970-03-09 | Rotary brush with collar |
Country Status (4)
Country | Link |
---|---|
US (1) | US3616484A (en) |
CA (1) | CA931310A (en) |
DE (1) | DE2105176A1 (en) |
GB (1) | GB1280793A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4041565A (en) * | 1975-03-24 | 1977-08-16 | Butterworth Systems Inc. | Rotatable brushes |
US6477731B2 (en) * | 2001-03-26 | 2002-11-12 | Patrick H. Monahan | Mop with self-contained wringer |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008048138A1 (en) * | 2008-09-20 | 2010-04-08 | Mtu Aero Engines Gmbh | Brush, particularly brush for mechanical surface working of metallic work pieces in aircraft engine, has multiple individual or bundled brush fibers for forming brush braid, where brush fibers are fastened in brush body |
-
1970
- 1970-03-09 US US17435A patent/US3616484A/en not_active Expired - Lifetime
-
1971
- 1971-01-14 GB GB0970/71A patent/GB1280793A/en not_active Expired
- 1971-02-04 DE DE19712105176 patent/DE2105176A1/en active Pending
- 1971-02-11 CA CA105164A patent/CA931310A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4041565A (en) * | 1975-03-24 | 1977-08-16 | Butterworth Systems Inc. | Rotatable brushes |
US6477731B2 (en) * | 2001-03-26 | 2002-11-12 | Patrick H. Monahan | Mop with self-contained wringer |
Also Published As
Publication number | Publication date |
---|---|
CA931310A (en) | 1973-08-07 |
GB1280793A (en) | 1972-07-05 |
DE2105176A1 (en) | 1971-10-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF BOSTON THE, MASSACHUSETTS Free format text: SECURITY INTEREST;ASSIGNOR:JASON INCORPORATED, A CORP OF DE.;REEL/FRAME:004549/0533 Effective date: 19860108 Owner name: FIRST NATIONAL BANK OF BOSTON THE Free format text: SECURITY INTEREST;ASSIGNOR:JASON INCORPORATED, A CORP OF DE.;REEL/FRAME:004549/0533 Effective date: 19860108 |
|
AS | Assignment |
Owner name: JASON INCORPORATED, A CORP OF DELAWARE, WISCONSIN Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:FIRST NATIONAL BANK OF BOSTON, THE;REEL/FRAME:005284/0149 Effective date: 19891027 |
|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF CHICAGO, THE Free format text: SECURITY INTEREST;ASSIGNOR:JASON INCORPORATED A CORP. OF DELAWARE;REEL/FRAME:005756/0863 Effective date: 19910628 |