US3847532A - Apparatus for fabricating brushes having molded ends - Google Patents

Apparatus for fabricating brushes having molded ends Download PDF

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Publication number
US3847532A
US3847532A US00236938A US23693872A US3847532A US 3847532 A US3847532 A US 3847532A US 00236938 A US00236938 A US 00236938A US 23693872 A US23693872 A US 23693872A US 3847532 A US3847532 A US 3847532A
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United States
Prior art keywords
mold
filaments
brush
plug member
cavity
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Expired - Lifetime
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US00236938A
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English (en)
Inventor
E Bischoff
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Individual
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Individual
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Priority to US00236938A priority Critical patent/US3847532A/en
Priority to CA163,747A priority patent/CA974013A/en
Priority to GB777473A priority patent/GB1411340A/en
Priority to DE2313572A priority patent/DE2313572A1/de
Priority to FR7310351A priority patent/FR2177057B3/fr
Priority to JP48031974A priority patent/JPS496769A/ja
Application granted granted Critical
Publication of US3847532A publication Critical patent/US3847532A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D3/00—Preparing, i.e. Manufacturing brush bodies
    • A46D3/04—Machines for inserting or fixing bristles in bodies
    • A46D3/047—Machines for inserting or fixing bristles in bodies for clamping or gluing bristles into rings, e.g. paint brushes, brooms

Definitions

  • the present invention relates to brushes and apparatus and methods for making same. More particularly, the apparatus and method of the present invention are directed to fabricating brushes from synthetic materials, such as, for example, nylon filaments, polypropylene, polyester, and other thermoplastic and/or moldable material.
  • the handle is set into the ferrule by nailing, stapling, or the like.
  • the handle is generally bound to the filaments or bristles.
  • a method for fabricating brushes includes inserting a plurality of synthetic filaments into a hollow mold which defines a cavity therein, the mold including a movable plug member located substantially centrally of the mold and which is movable in the longitudinal direction of the filaments.
  • the movable plug in one embodiment, is located in a first position (either within the lower portion of the mold or outside the mold) during insertion of the synthetic filaments into the mold and is movable to a second position within the mold to effectively separate the mold into two cavities and to form a void space substantially centrally of the filaments.
  • the plug may be located above the mouth of the mold to receive filaments, and then retracted into the mold to form the two cavities therein and to form the void space. Free ends of the filaments are heated to liquify same, and a platen element is inserted into the liquified material. The liquified material is solidified adjacent the platen element, and the completed brush is removed from the mold. Preferably, removal from the mold is carried out by moving the movable plug in the direction of the platen to eject same from the mold.
  • apparatus for fabricating brushes includes a hollow mold defining a cavity therein, the cavity having an open end through which is received a plurality of synthetic brush filaments.
  • a movable plug member is inserted substantially centrally of the mold, and is movable in the longitudinal direction of the filaments.
  • the movable plug member is movable from a first position for receiving filaments in the mold, to a second position interior of the mold for engaging the filaments with the inner surface of the mold which effectively separates the mold into first and second cavity portions which are isolated from each other, and which substantially centrally separates the filaments during fabrication of the brush.
  • the movable plug member is preferably further movable to eject the finished brush from the mold.
  • the first position of the movable plug member may be inside the mold or exterior of the mold to receive filaments into the mold.
  • the plug member is preferably tapered to facilitate the passing of the filaments therearound, such as during insertion of the filaments into the mold, and during movement of the plug.
  • a plurality of molds may be mounted on a support device, such as a turret, for performing steps successively to mass produce brushes.
  • FIG. 1 is a sectional view of a mold and a partial sectional view of a movable plug for use in fabricating brushes in accordance with the present invention
  • FIG. 2 is an end view of the mold of FIG. 1;
  • FIG. 3 is a sectional view of the mold of FIG. I with synthetic brush filaments inserted therein and the plug in operating position, and showing the application of heat to the exposed filaments;
  • FIG. 4 is a sectional view of the mold with the brush handle inserted in the melted synthetic filament material
  • FIG. 5 illustrates the molded brush after removal from the mold
  • FIG. 6 illustrates a ferrule for use in a modification of the present invention
  • FIG. 7 is an abbreviated sectional view similar to that of FIG. 1 with the ferrule of FIG. 6 in place in the mold;
  • FIG. 8 is an abbreviated sectional view similar to that of FIG. 4 showing a metal movable platen instead of a brush handle for use in compression molding a brush without a handle;
  • FIG. 9 illustrates a brush which is compression molded without a handle using the technique and apparatus of FIG. 8;
  • FIG. 10 is a sectional view of an alternative filament loading arrangement of the mold and plug of the present invention.
  • I FIG. 11 shows a typical arrangement for mass production of brushes according to the present invention.
  • a movable metal positioning plug 1 is movably inserted in a mold 4 which defines a cavity 5 therein.
  • the mold 4 is cylindrical in shape when fabricating round brushes or rectangular in shape with rounded edges when fabricating fiat brushes.
  • the plug 1 has a pointed tip end 2 to divide and push through the mass of filaments 9 as they are inserted in the mold 4. As shown in FIG. 3, the plug 1 provides a central opening for the filaments to form a brush having excellent characteristics.
  • the plug 1 also has a shaft or pin portion 3 which extends from the tip end 2 through the closed end of the mold 4 through aperture 8.
  • Positioning of the plug 1 within the cavity of mold 4 is accomplished by movement of the shaft 3 in the direction of the arrows A and B.
  • the shaft 3 and tip end 2 of plug 1 may be integral with each other or may be connected together by, for example, screw threads, adhesives, etc.
  • the walls of the mold 4 are fabricated of metal, rigid fiber or other rigid material.
  • the cavity 5 within the mold 4 will be generally cylindrical in form as shown in FIG. 2 for round brushes, or oblong (not shown) for fiat brushes.
  • a shoulder 6 to give compression to the mass of filaments 9 when the plug 1 is in the advanced (or upward) position as shown in FIG. 3.
  • a cylindrical enlargement or trough 7 is also preferably formed in the mold cavity to permit the filament ends to deflect and pass the plug 1 when the filaments 9 are being placed in the mold with the plug retracted to its lower position as shown in FIG. 1.
  • the mechanical means 22 for moving the shaft 1 are not shown in detail so as not to unduly obscure the present inventive concept.
  • the tip end 2 of plug 1 is shown round in this embodiment. However, the shape thereof may be varied, depending upon the shape of the mold 4 and the shape of the brush being formed.
  • FIG. 3 illustrates a mass of filaments 9 positioned within the cavity of mold 4.
  • Plug 1 is shown advanced to the molding position.
  • the inner shoulder 6 of the mold wall engages the mass of filaments 9 pressed against it by the plug 1 to form an effective closure separating parts a and 15b of the mold cavity.
  • Heat is directed, for example by a flame element 20, towards the exposed filaments in the open mold cavity 15b.
  • the filament mass in cavity 150 is effectively insulated from the direct heat and molding pressure by the shoulder 6 which presses thereagainst. Sufficient heat is applied to completely liquify by melting the filament mass extending into cavity 15b.
  • This melting may be achieved by an open flame, a jet of heated inert gas, radiation from a hot metal mass that does not touch the filaments, directed and controlled heat rays, ultrasonic waves, direct contact by a heated platen, or any other suitable heating means.
  • the exposed filament material in cavity 15b is melted to liquifaction, and then the movable platen ltlI in the form of the brush handle is moved into the upper opening of the mold 4. Under slight pressure the melted filament material is pressed into the desired shape 11, being sealed at the same time to the handle 10 by engaging the circular indentation 12. Indentation 12 may be formed continuously on the periphery of handle 10 or may be spaced thereabout. In the molding process, after cooling, the filaments 9 are fused to each other at their heated ends and to the solidified filament material at 13, giving shape and rigid bonding to the brush components. As shown in FIG. 5, the solidified filament material at 11 provides a finished outer surface-for the brush where the filaments join the handle.
  • the handle 10 may be made of a material which will fuse with the molten filament material. In this event the indentations 12 can be eliminated. However, providing indentation 12 will provide a more secure structure.
  • the finished brush is preferably removed from the mold by pushing the pin 1 upward in the direction of arrow A to a position higher than that shown in FIG. 4 to push the finished brush out of the mold 4.
  • the handle 10 can be lifted for removal, but pushing out with plug 1 creates fewer stresses in the brush and is preferable.
  • a brush with a separately inserted ferrule can also be fabricated.
  • a ferrule 14 either of the same material as the filaments 9 or of other suitable materials, and having the desired color and composition, may be used.
  • the ferrule 14 is preferably a previously fabricated circular band (FIG. 6) and is inserted in the mouth of the mold 4 (FIG. 7) prior to inserting the filaments 9 in the mold.
  • the heat application procedure is the same as described in the foregoing example. If the ferrule 14 is of the same material as the filaments 9, fusion of the ferrule 14 to the filament material will occur. If the ferrule material is of different material, the ferrule 14 will adhere by compression of its molten surface (during the heat application) into the circular groove 12 of the handle 10. The filament material will fuse to the molten surface of the ferrule.
  • a movable metal platen 16 (FIG. 8) is substituted for the handle 10 of FIG. 4, producing a brush base 17 of contour and pattern according to the mold surface design of platen 16. Ejection of the brush is preferably by pushing same out of the mold by raising movable plug 1.
  • alternative arrangement of the present invention is to provide the plug 1 in an extended position above the open mouth of the mold 4 during insertion of the filaments therein.
  • the plug 1 is retracted into the mold to the position shown in FIG. 3.
  • the remainder of the operations described above are then carried out substantially without variation.
  • An advantage of this method is that when the plug is retracted downwardly into the mold after insertion of the filaments, the plug aids in firmly seating the filaments against the bottom of the mold to provide a more consistent contour of the resulting brush.
  • a further advantage of the embodiment of FIG. 10 whereby the movable plug 1 is extended above the open end of the mold 4 during the insertion of filaments 9, is that the mechanism for moving the plug up and down need only be movable between two positions. It is not necessary for the movable plug to be retractable to the bottom portion of the mold, and therefore, the only two positions required are a retracted position to the position shown in FIG. 3 and an extended position shown in FIG. 10. This simplifies the operating mechanism and upon ejection of the brush, it is merely necessary to move the plug to the position shown in FIG. 10, thereby ejecting the brush and simultaneously setting up the device for receipt of the next batch of filaments.
  • a still further arrangement (not shown) according to the present invention includes locating the plug outside the mold in the vicinity of the end of the mold remote from the end where heat is applied. After loading of the filaments through said remote end of the mold adjacent the plug, the plug is moved interior of the mold and the remainder of the steps are carried out.
  • an important feature of the present invention is the movable plug '1 which serves to position the filaments 9 in the desired direc- F ther, the plug 1 eliminates .the need for fabricating separate tufts to achieve separation in the bristle mass at the brush block. No brush block, per se, is required and excellent separation of the bristles is achieved by virtue of the use of the plug 1 of the present invention.
  • the movable plug 1 further serves as an element in the mold cavity closure to permit compression molding and to restrict heat absorption by the lower portions of the bristles. This eliminates undesired melting of the synthetic bristles below the portion at which the heat is applied. Plug 1 effectively serves as a heat sink during the molding process.
  • the movable plug 1 also preferably serves as a knock-out pin to eject the finished brush from the mold after the fabrication process.
  • the lower surface 23 of the mold 4 is preferably concave as shown in FIGS. 1, 3 and 4. This surface 23 locates the filaments so that the work end of the resulting brush has the proper shape or contour.
  • the particular shape of the bottom surface 23 depends upon the desired characteristics of the brushes being fabricated.
  • the mold 4 may be made from plural parts with a removable bottom section so that the contour of surface 23 of the bottom section can be easily and economically changed, as desired.
  • the mold 4 defines a cavity which is divided into two sections by positioning of the movable plug after insertion of the filaments'9.
  • the section a contains the mass of filaments which form the body of the brush, the movable plug 1 and mold 4 combining to effectively insulate the lower portions of the filaments from direct heat and molding pressure.
  • Section 15b is an open mold cavity during heat application, and becomes a closed pressure mold on insertion of the handle as a movable pla ten.
  • the mold 4 is designed such that the heat is effecgively guided to the desired portions of the filaln er'its, and such that a ferrule can optionally be used with the present invention.
  • the mold may have straight inside walls (i.e.
  • shoulder 6 may be eliminated), but far better results are obtainable using the shoulder 6 to provide more distinct sections 15a and 15b to facilitate filament loading and to provide better heat isolation between cavities. Further, it is possible to use the mold of the present invention with a cold mold compression technique to give shape to the molten filament ends, after melting thereof.
  • a plurality of mold 4 and movable plug 1 combinations can be mounted on a movable platform, such as a turret, to provide an effective mass-production of brushes.
  • a turret 24 is advanceable (i.e.,
  • filaments 9 are inserted into the mold 4 with the movable plug 1 in its lower-most position as illustrated in FIG. 1.
  • the position of FIG. 10 may also be used.
  • the details of the insertion of filaments are not shown in FIG. 11 forthe sake of clarity.
  • the handle 10, or the like can be inserted at the heat application station, or the turret could be advanced to locate the mold at a handle insertion station (shown in FIG. 11) for insertion of the handle into the molten material.
  • a separate handle insertion station could be eliminated and the handle could be inserted at the heat application station.
  • the completed brush is ejected preferably by. raising the movable plug 1, as discussed hereinabove.
  • the mechanisms for moving the plug 1, for inserting the filaments and handle, and for applying the heat are not shown.
  • the advancing mechanism for the turret 21 is not shown. The implementation of the various mechanisms to carry out these functions should be apparent in view of the state of the art.
  • the molds could be stationary and the various operating mechanisms for applying heat, loading filaments, etc., can be movable relative to the fixed molds.
  • Apparatus for fabricating brushes comprising:
  • a hollow mold defining a cavity therein, said cavity being adapted to receive a plurality of synthetic brush filaments through anopen end thereof;
  • a movable plug member movably inserted substantially longitudinally centrally of said mold, and movable in the longitudinal direction of said filaments;
  • said movable plug member by said tightly pressing said filaments between itself and said inner surface of said mold substantially preventing flow of molten filament material between adjacent pressed portions of said filaments and shielding portions of said filaments in said mold cavity from heat applied to the filament ends in an end portion of said mold cavity.
  • Apparatus according to claim 1 including a funnel member. received in said open end of said mold for guiding filaments into said mold.
  • Apparatus according to claim 13 including heat ing means for heating the ends of said filaments to liquify same.
  • Apparatus according to claim 1 comprising a rotatable turret means which is adapted to receive a plurality of said molds, said turret means including means for rotating said turret to successively move said plurality of molds to respective operating stations.
  • Apparatus according to claim 14 wherein said operating stations comprise respective stations for inserting filaments, heating filaments and ejecting brushes from said mold.
  • Apparatus for fabricating brushes comprising:
  • a hollow mold having an inwardly projecting shoulder at an intermediate portion thereof to define a pair of cavities therein, said cavities being adapted to receive a plurality of synthetic brush filaments through an open end thereof;
  • a movable plug member movably inserted substantially longitudinally centrally of said mold, and movable in the longitudinal direction of said filaments;
  • said movable plug member further shielding portions of said filaments in said mold cavity from heat applied to the filament ends in an end portion of said mold cavity.
  • Apparatus according to claim 1 wherein said movable plug member has a tapered portion which tapers inwardly relative to the inner surface of said mold, the widest portion of said plug member tightly pressing said filaments against said inner surface of said mold.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Brushes (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Coating Apparatus (AREA)
US00236938A 1972-03-22 1972-03-22 Apparatus for fabricating brushes having molded ends Expired - Lifetime US3847532A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00236938A US3847532A (en) 1972-03-22 1972-03-22 Apparatus for fabricating brushes having molded ends
CA163,747A CA974013A (en) 1972-03-22 1973-02-14 Apparatus and method for fabricating brushes
GB777473A GB1411340A (en) 1972-03-22 1973-02-16 Apparatus and method for fabricating brushes or brush components
DE2313572A DE2313572A1 (de) 1972-03-22 1973-03-19 Verfahren und vorrichtung zur herstellung von pinseln, buersten und dergleichen
FR7310351A FR2177057B3 (fr) 1972-03-22 1973-03-22
JP48031974A JPS496769A (fr) 1972-03-22 1973-03-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00236938A US3847532A (en) 1972-03-22 1972-03-22 Apparatus for fabricating brushes having molded ends

Publications (1)

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US3847532A true US3847532A (en) 1974-11-12

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Application Number Title Priority Date Filing Date
US00236938A Expired - Lifetime US3847532A (en) 1972-03-22 1972-03-22 Apparatus for fabricating brushes having molded ends

Country Status (6)

Country Link
US (1) US3847532A (fr)
JP (1) JPS496769A (fr)
CA (1) CA974013A (fr)
DE (1) DE2313572A1 (fr)
FR (1) FR2177057B3 (fr)
GB (1) GB1411340A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072482A (en) * 1989-08-31 1991-12-17 Professional Dental Technologies, Inc. End Brush with male projection, apparatus and method for making same, and apparatus for use thereof
WO2020083848A3 (fr) * 2018-10-22 2020-10-01 Zahoransky Ag Dispositif et procédé pour la formation de faisceaux de poils, machine de fabrication de brosses, utilisation d'un dispositif pour la formation de faisceaux de poils, brosse, programme informatique ainsi que support lisible par ordinateur
US10980336B2 (en) 2017-09-28 2021-04-20 The Procter & Gamble Company Method of making a unitary brush head and unitary toothbrush head
CN112867417A (zh) * 2018-10-22 2021-05-28 沙郎斯基股份公司 用于成形刷毛束的装置和方法、制刷机、用于成形刷毛束的装置的应用、刷、计算机程序以及计算机可读介质

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK148073C (da) * 1982-06-22 1985-09-30 Svensk Eldental Aktiebolaget Fremgangsmaade til fremstilling af et boerstehoved, fortrinsvis til tandbehandling
GB2139483B (en) * 1983-01-20 1985-06-05 Tucel Industries Tufted constructions
GB2159699B (en) * 1984-05-23 1988-06-02 Rodney David Cole An applicator for the application of cosmetic products
DE3832520A1 (de) * 1988-09-24 1990-04-05 Schiffer Fa M & C Verfahren und vorrichtung zum herstellen von buersten, insbesondere von buersten fuer hygienische beduerfnisse, wie zahnbuersten
DE4027288C2 (de) * 1990-08-29 2001-08-09 Coronet Werke Gmbh Vorrichtung zur Erzeugung von Borstenbündeln und Verfahren zur Herstellung von Borstenwaren mittels der Vorrichtung
DE102018126208B4 (de) * 2018-10-22 2022-10-13 Zahoransky Ag Vorrichtung und Verfahren zum Formen von Borstenbündeln, Bürstenherstellungsmaschine, Verwendung einer Vorrichtung zum Formen von Borstenbündeln, Bürste, Computerprogramm sowie computerlesbares Medium

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US638738A (en) * 1898-10-17 1899-12-12 Burton D Knickerbocker Method of and machine for producing hollow rubber articles.
US2397471A (en) * 1942-11-18 1946-04-02 Carbide & Carbon Chem Corp Method of producing strain-free thermoplastic articles
US2653056A (en) * 1948-12-20 1953-09-22 Modglin Company Inc Method of making brooms
US2652580A (en) * 1947-02-24 1953-09-22 Edwin A Neugass Brush
US2664316A (en) * 1948-02-05 1953-12-29 Lambert Company Method of making brushes
FR1111028A (fr) * 1954-10-28 1956-02-21 Pinceau
US3200451A (en) * 1962-05-11 1965-08-17 Worswick Alan Eng Ingot casting machines
US3642415A (en) * 1970-08-10 1972-02-15 Shell Oil Co Plunger-and-diaphragm plastic sheet forming apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US638738A (en) * 1898-10-17 1899-12-12 Burton D Knickerbocker Method of and machine for producing hollow rubber articles.
US2397471A (en) * 1942-11-18 1946-04-02 Carbide & Carbon Chem Corp Method of producing strain-free thermoplastic articles
US2652580A (en) * 1947-02-24 1953-09-22 Edwin A Neugass Brush
US2664316A (en) * 1948-02-05 1953-12-29 Lambert Company Method of making brushes
US2653056A (en) * 1948-12-20 1953-09-22 Modglin Company Inc Method of making brooms
FR1111028A (fr) * 1954-10-28 1956-02-21 Pinceau
US3200451A (en) * 1962-05-11 1965-08-17 Worswick Alan Eng Ingot casting machines
US3642415A (en) * 1970-08-10 1972-02-15 Shell Oil Co Plunger-and-diaphragm plastic sheet forming apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072482A (en) * 1989-08-31 1991-12-17 Professional Dental Technologies, Inc. End Brush with male projection, apparatus and method for making same, and apparatus for use thereof
US10980336B2 (en) 2017-09-28 2021-04-20 The Procter & Gamble Company Method of making a unitary brush head and unitary toothbrush head
US11425992B2 (en) 2017-09-28 2022-08-30 The Procter & Gamble Company Mold insert and method of making a mold insert
US11666136B2 (en) 2017-09-28 2023-06-06 The Procter & Gamble Company Mold insert and method of making a mold insert
US11819118B2 (en) 2017-09-28 2023-11-21 The Procter & Gamble Company Method of making a unitary brush head and unitary toothbrush head
US12011082B2 (en) 2017-09-28 2024-06-18 The Procter & Gamble Company Mold insert and method of making a mold insert
WO2020083848A3 (fr) * 2018-10-22 2020-10-01 Zahoransky Ag Dispositif et procédé pour la formation de faisceaux de poils, machine de fabrication de brosses, utilisation d'un dispositif pour la formation de faisceaux de poils, brosse, programme informatique ainsi que support lisible par ordinateur
CN112867417A (zh) * 2018-10-22 2021-05-28 沙郎斯基股份公司 用于成形刷毛束的装置和方法、制刷机、用于成形刷毛束的装置的应用、刷、计算机程序以及计算机可读介质
CN112867416A (zh) * 2018-10-22 2021-05-28 沙郎斯基股份公司 用于使刷毛束成形的装置和方法、制刷机、用于使刷毛束成形的装置的用途、刷子、计算机程序以及计算机可读介质
US20210353047A1 (en) * 2018-10-22 2021-11-18 Zahoransky Ag Apparatus and method for forming bristle bundles, brush manufacturing machine, use of an apparatus for forming bristle bundles, brush, computer program and computer-readable medium

Also Published As

Publication number Publication date
JPS496769A (fr) 1974-01-21
DE2313572A1 (de) 1973-10-11
FR2177057A1 (fr) 1973-11-02
CA974013A (en) 1975-09-09
FR2177057B3 (fr) 1976-03-19
GB1411340A (en) 1975-10-22

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