US2666954A - Method of making toothbrushes - Google Patents

Method of making toothbrushes Download PDF

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US2666954A
US2666954A US323290A US32329052A US2666954A US 2666954 A US2666954 A US 2666954A US 323290 A US323290 A US 323290A US 32329052 A US32329052 A US 32329052A US 2666954 A US2666954 A US 2666954A
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wafer
sponge rubber
adhesive
handle
shape
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US323290A
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Ralph B Potter
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34Auxiliary operations
    • B29C44/56After-treatment of articles, e.g. for altering the shape
    • B29C44/569Shaping and joining components with different densities or hardness
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/1285Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being foamed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34Auxiliary operations
    • B29C44/3492Expanding without a foaming agent
    • B29C44/3496The foam being compressed and later released to expand
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34Auxiliary operations
    • B29C44/56After-treatment of articles, e.g. for altering the shape
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/4981Utilizing transitory attached element or associated separate material
    • Y10T29/49812Temporary protective coating, impregnation, or cast layer

Definitions

  • This invention pertains to improvements in the method of making dental equipment, and is particularly directed to improvements in making a toothbrush or tooth cleaning device.
  • One of the objects of this invention is to provide an improved and economical method of making toothbrushes.
  • a further object of this invention is to provide a novel method of proceeding in the preparation of a sponge rubber type abrasive toothbrush in which the sponge rubber element is initially saturated with a suitable adhesive material, then compacted to a wafer thin shape and while in that condition held in the mold of a plastic injection machine at which time the plastic handle material is injected around a portion of the wafer so as to lock it into the handle with an hour glass shape, and then to finally dissolve the adhesive from the sponge rubber wafer member to allow it to expand to its normal operating shape.
  • Fig. 1 is a perspective view of the sponge rubber abrasive element at the beginning of the process.
  • Fig. 2 is a View showing the sponge rubber member of Fig. 1 being soaked in a suitable soluble adhesive material.
  • Fig. 3 ShOWs the saturated member of Fig. 2 compressed to wafer shape.
  • Fig. 4 shows the wafer after release from the compression operation of Fig. 3 and showing it retaining its wafer-like shape after drying of the adhesive material of Fig. 2.
  • Fig. 6 is an end elevation of the compressed wafer of Fig. 4.
  • Fig. 8 is a view similar to Fig. 7 but showing the situation after the plastic material has been injected in the mold.
  • Fig. 9 is a view on the line 99 of Fig. 11 showing the expansion of the wafer to normal operating shape after the adhesive material has been dissolved.
  • Fig. 10 is an enlarged perspective view of the slot formed in the handle by the wafer during the injection process of Fig. 8.
  • Fig. 11 shows the general perspective view of the completed toothbrush made by the process of applicant's invention.
  • Fig. 1 the initial sponge rubber abrasive carrying element for the brush ready to be placed through the novel process.
  • the sponge rubber element I5 is first soaked in a suitable adhesive, mucilage, or other similar material such as a colloidal solution of acacia (gum arabic) in water or any other suitable soluble adhesive capable of holding the sponge rubber in compressed condition after the adhesive sets.
  • a suitable adhesive mucilage, or other similar material
  • a colloidal solution of acacia gum arabic
  • Fig. 2 wherein the sponge rubber element 15 may be placed in a beaker [6 containing the solvent or vehicle I! containing the adhesive.
  • Fig. 8 is shown the situation after the plastic material 24 has been forced into the cavity 23 resulting in the hydrostatic pressure causing the side portions 25 of the wafer IM to be indented or formed in hour glass shape with the bulbous portion 26 of the wafer I511 embedded in the plastic material 24.
  • the serrations of the wafer at 20 also cause the plastic to form in corrugated or serrated hour glass shape sides at 2! shown in Fig. 10 so as to prevent the longitudinal deflection or movement of the abrasive sponge rubber member in the handle 28 of the toothbrush at the completion of the injection operation of Fig. 8.
  • Fig. 9 is shown the wafer at 15a at the time it is removed from the injection machine while still held in compacted form by the adhesive.
  • the element l 511 Upon dissolving the adhesive from the sponge rubber by soaking it in water or other suitable solvent for the adhesive selected, the element l 511 then expands to the normal operative shape l5b forming the abrasive carrying element for the toothbrushing device.
  • the element lib is held by the hour glass bulbous end 3 26 of the sponge rubber member 151) in the tooth brush handle in a rigid positive manner.
  • Fig. 11 The completed brushing device is shown in Fig. 11 wherein the element [5b is now secured to the outer end 28b of the toothbrush handle 28 and preferably at the same time that the handle 28 is formed a single tuft 29 may be formed at the other end of the handle together with a hanging hole 30 between the element [5b and the tuft 29 at the endof the handle.
  • the method of attaching a sponge rubber abrasive carrying element to a handle to form a tooth cleaning device comprising the steps of: (a) soaking said sponge rubber element in a soluble adhesive; ('12) compressing said sponge rubber element to a thin wafer shaped element; ('0) drying said compressed "element to retain said thin wafer shape; (11) securing said wafer shaped element in a die with a portion thereof projecting into the cavity to be filled in said the; (e) injecting plastic material in said cavity around said wafer shaped element to form a locking connection of hour glass shape between said wafer shaped element and said injected plastic material forming the handle of said device; and (f) finally dissolving said adhesive from said wafer shaped element projecting from said handle to expand said wafer to form the abrasive carrying medium for said tooth cleaning device.
  • the method of forming a sponge rubber toothbrush device comprising: (a) soaking the initial sponge rubber element in an adhesive; (1)) reducing said adhesive soaked sponge rubber element to a wafer shape; (0) drying said wafer shaped element to dry and be held in said shape by said adhesive; (d) injectinga plastic material around a portion of said wafer to form a handle therefor; (e) soaking the exposed portion of said wafer shaped element projecting from said plastic handle in a solvent to dissolve said adhesive to expand said element to its initial size and shape.
  • the method or making a sponge rubber type toothbrush comprising: (a) soaking the sponge rubber element in an adhesive solution; (b) compressing said so saturated sponge rubber element to wafer form with corrugated sides thereon and solidifying said wafer into said shape; "('0) placin'g said wafer with said corrugations engaging the dies of a plastic injection machine with a portion of said wafer projecting into the cavity to be filled with injected materials; (11) injecting plastic material in said cavity to form an hour glas locking connection between said wafer and sa'idfpla'stic material having longitudinally spaced corrugations in said hour glass connection therebetween; and (e) finally soaking said sponge rubber element in a solvent to remove said adhesi've material from the so mounted sponge rubber element to expand said sponge rubber to operating shape.

Description

Jan. 26, 1954 R. B. POTTER 2,666,954
METHOD OF MAKING TOOTHBRUSHES Filed Nov. 29, 1952 IN V EN TOR.
EH4 P// 5. P0 r7152.
ATTORNEY Patented Jan. 26, 1954 UNITED STATES PATENT OFFICE METHOD OF MAKING TOOTHBRUSHES Ralph B. Potter, Boulder, Colo.
Application November 29, 1952, Serial No. 323,290
3 Claims.
This invention pertains to improvements in the method of making dental equipment, and is particularly directed to improvements in making a toothbrush or tooth cleaning device.
One of the objects of this invention is to provide an improved and economical method of making toothbrushes.
Another object of this invention is to provide a method for making an improved brushing device for teeth including a sponge rubber abrasive cleaning element attached in an efficient manner to the operating handle for the device.
A further object of this invention is to provide a novel method of proceeding in the preparation of a sponge rubber type abrasive toothbrush in which the sponge rubber element is initially saturated with a suitable adhesive material, then compacted to a wafer thin shape and while in that condition held in the mold of a plastic injection machine at which time the plastic handle material is injected around a portion of the wafer so as to lock it into the handle with an hour glass shape, and then to finally dissolve the adhesive from the sponge rubber wafer member to allow it to expand to its normal operating shape.
Further features and advantages of this invention will appear from a detailed description of the drawings in which:
Fig. 1 is a perspective view of the sponge rubber abrasive element at the beginning of the process.
Fig. 2 is a View showing the sponge rubber member of Fig. 1 being soaked in a suitable soluble adhesive material.
Fig. 3 ShOWs the saturated member of Fig. 2 compressed to wafer shape.
Fig. 4 shows the wafer after release from the compression operation of Fig. 3 and showing it retaining its wafer-like shape after drying of the adhesive material of Fig. 2.
Fig. 5 is a side elevation of the compressed wafer of Fig. 4.
Fig. 6 is an end elevation of the compressed wafer of Fig. 4.
Fig. '7 is a fragmentary view showing the wafer held in the dies of a plastic injection machine.
Fig. 8 is a view similar to Fig. 7 but showing the situation after the plastic material has been injected in the mold.
Fig. 9 is a view on the line 99 of Fig. 11 showing the expansion of the wafer to normal operating shape after the adhesive material has been dissolved.
Fig. 10 is an enlarged perspective view of the slot formed in the handle by the wafer during the injection process of Fig. 8.
Fig. 11 shows the general perspective view of the completed toothbrush made by the process of applicant's invention.
As exemplary of one preferred method of making a toothbrush or the like in accordance with this invention there is shown in Fig. 1 the initial sponge rubber abrasive carrying element for the brush ready to be placed through the novel process. The sponge rubber element I5 is first soaked in a suitable adhesive, mucilage, or other similar material such as a colloidal solution of acacia (gum arabic) in water or any other suitable soluble adhesive capable of holding the sponge rubber in compressed condition after the adhesive sets. This is shown in Fig. 2 wherein the sponge rubber element 15 may be placed in a beaker [6 containing the solvent or vehicle I! containing the adhesive.
After the sponge rubber has been so treated in Fig. 2 it is placed in a press or suitable clamp means l8 and I9 which may be formed with serrations 20 and compressed to the flat wafer-like shape shown in Figs. 3, 4, 5, and 6. After the adhesive has set up the clamp members 18 and 19 may be removed resulting in the compressed wafer shape 15a shown in Figs. 4, 5 and 6. The thus formed wafer is then placed between the dies 2i and 22 of a plastic injection molding machine as shown in Fig. '7 having a cavity 23 formed by the dies having the correct cross sectional shape for the toothbrush handle to be utilized.
In Fig. 8 is shown the situation after the plastic material 24 has been forced into the cavity 23 resulting in the hydrostatic pressure causing the side portions 25 of the wafer IM to be indented or formed in hour glass shape with the bulbous portion 26 of the wafer I511 embedded in the plastic material 24. The serrations of the wafer at 20 also cause the plastic to form in corrugated or serrated hour glass shape sides at 2! shown in Fig. 10 so as to prevent the longitudinal deflection or movement of the abrasive sponge rubber member in the handle 28 of the toothbrush at the completion of the injection operation of Fig. 8.
In Fig. 9 is shown the wafer at 15a at the time it is removed from the injection machine while still held in compacted form by the adhesive. Upon dissolving the adhesive from the sponge rubber by soaking it in water or other suitable solvent for the adhesive selected, the element l 511 then expands to the normal operative shape l5b forming the abrasive carrying element for the toothbrushing device. It is to be noted that the element lib is held by the hour glass bulbous end 3 26 of the sponge rubber member 151) in the tooth brush handle in a rigid positive manner.
The completed brushing device is shown in Fig. 11 wherein the element [5b is now secured to the outer end 28b of the toothbrush handle 28 and preferably at the same time that the handle 28 is formed a single tuft 29 may be formed at the other end of the handle together with a hanging hole 30 between the element [5b and the tuft 29 at the endof the handle.
Thus by a highly novel and efficient process a completely new type of toothbrushing device is provided and in which the sponge rubber abrasive carrying element is securely, positively and quickly secured to the plastic handle 28 of the device While the apparatus herein disclosed and described constitutes a preferred form of. the invention, it is also to be understood that the apparatus is capable of mechanical alteration without departing from the spirit of "the invent-ion and that such mechanical arrangement and commercial adaptation as fall within the scope of the appendent claims are intended to be included herein.
Having thus fully set forth and described this invention, what is claimed and desired to be o'btained by United States Letters Patent is:
1. The method of attaching a sponge rubber abrasive carrying element to a handle to form a tooth cleaning device comprising the steps of: (a) soaking said sponge rubber element in a soluble adhesive; ('12) compressing said sponge rubber element to a thin wafer shaped element; ('0) drying said compressed "element to retain said thin wafer shape; (11) securing said wafer shaped element in a die with a portion thereof projecting into the cavity to be filled in said the; (e) injecting plastic material in said cavity around said wafer shaped element to form a locking connection of hour glass shape between said wafer shaped element and said injected plastic material forming the handle of said device; and (f) finally dissolving said adhesive from said wafer shaped element projecting from said handle to expand said wafer to form the abrasive carrying medium for said tooth cleaning device.
2. The method of forming a sponge rubber toothbrush device comprising: (a) soaking the initial sponge rubber element in an adhesive; (1)) reducing said adhesive soaked sponge rubber element to a wafer shape; (0) drying said wafer shaped element to dry and be held in said shape by said adhesive; (d) injectinga plastic material around a portion of said wafer to form a handle therefor; (e) soaking the exposed portion of said wafer shaped element projecting from said plastic handle in a solvent to dissolve said adhesive to expand said element to its initial size and shape.
3. The method or making a sponge rubber type toothbrush comprising: (a) soaking the sponge rubber element in an adhesive solution; (b) compressing said so saturated sponge rubber element to wafer form with corrugated sides thereon and solidifying said wafer into said shape; "('0) placin'g said wafer with said corrugations engaging the dies of a plastic injection machine with a portion of said wafer projecting into the cavity to be filled with injected materials; (11) injecting plastic material in said cavity to form an hour glas locking connection between said wafer and sa'idfpla'stic material having longitudinally spaced corrugations in said hour glass connection therebetween; and (e) finally soaking said sponge rubber element in a solvent to remove said adhesi've material from the so mounted sponge rubber element to expand said sponge rubber to operating shape.
RALPH B. POTTER.
References Cited in the file of this .patent UNITED STATES PATENTS Number Name Date 1,924,337 Troupa Aug. 29, 1933 2,150,196 Vaughn Mar. 14, 1939 2,643,158 Baldanza June 23, 1 953
US323290A 1952-11-29 1952-11-29 Method of making toothbrushes Expired - Lifetime US2666954A (en)

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000464A (en) * 1957-09-18 1961-09-19 Bolt Beranek & Newman Acoustic absorber
US3070476A (en) * 1960-07-22 1962-12-25 Hicks & Otis Prints Inc Ornamentation of resilient absorbent materials
US3110553A (en) * 1959-10-29 1963-11-12 Gen Motors Corp Method of molding prestressed elastomeric articles
US3189669A (en) * 1962-11-01 1965-06-15 Goldfein Solomon Process for shipping flexible polyurethane foam
US3193598A (en) * 1961-08-16 1965-07-06 Freeman Chemical Corp Process of molding laminating preforms of foamed polyurethane having open, connected cells
US3242239A (en) * 1961-08-16 1966-03-22 Freeman Chemical Corp Filling structural cavities
US3269887A (en) * 1963-08-07 1966-08-30 Dow Chemical Co Settable, flexible, foamed resins
US3306967A (en) * 1963-08-12 1967-02-28 Scholl Mfg Co Inc Molding of resinous foams
US3306966A (en) * 1962-06-15 1967-02-28 Matejcek Franz Process for preparing compact expandable urethane foams
US3493643A (en) * 1967-04-26 1970-02-03 Gilbert Schwartzman Method for making resilient foam applicators
US3519708A (en) * 1966-11-21 1970-07-07 Dow Chemical Co Method of forming selectively permeable bodies from flexible polyurethane foam
US4077672A (en) * 1976-09-27 1978-03-07 Tantera, Inc. Method of making a sponge mop part
US4443286A (en) * 1980-01-23 1984-04-17 Ikeda Bussan Co., Ltd. Method of making cushion material from foam slabs and comminuted soft foam scrap
US4529569A (en) * 1983-09-29 1985-07-16 Margaret Palau Method of manufacturing an expandable spongy member
US5045267A (en) * 1988-02-03 1991-09-03 Coronet-Werke Heinrich Schlerf Gmbh Process and apparatus for producing bristle articles
US5538328A (en) * 1993-10-18 1996-07-23 Tucel Industries, Inc. Method of fusing filament to a sponge
US5792407A (en) * 1996-03-18 1998-08-11 Berzack; Jeffrey A. Method for attaching flexible, low density or compressible structures to injection molded polymer parts
US20090094768A1 (en) * 2005-09-09 2009-04-16 Colgate-Palmolive Toothbrush
US20180177171A1 (en) * 2016-12-27 2018-06-28 Paul S. Kelley Method of manufacturing a fishing lure
US11701845B2 (en) * 2019-09-17 2023-07-18 Nike, Inc. Method for forming a composite sole structure component

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1924337A (en) * 1933-08-29 troupa
US2150196A (en) * 1936-11-25 1939-03-14 Sidney P Vaughn Method and means for attaching spongy material to backings or holders
US2643158A (en) * 1947-06-25 1953-06-23 Columbia Protektosite Co Inc Method of making molded brushes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1924337A (en) * 1933-08-29 troupa
US2150196A (en) * 1936-11-25 1939-03-14 Sidney P Vaughn Method and means for attaching spongy material to backings or holders
US2643158A (en) * 1947-06-25 1953-06-23 Columbia Protektosite Co Inc Method of making molded brushes

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000464A (en) * 1957-09-18 1961-09-19 Bolt Beranek & Newman Acoustic absorber
US3110553A (en) * 1959-10-29 1963-11-12 Gen Motors Corp Method of molding prestressed elastomeric articles
US3070476A (en) * 1960-07-22 1962-12-25 Hicks & Otis Prints Inc Ornamentation of resilient absorbent materials
US3193598A (en) * 1961-08-16 1965-07-06 Freeman Chemical Corp Process of molding laminating preforms of foamed polyurethane having open, connected cells
US3242239A (en) * 1961-08-16 1966-03-22 Freeman Chemical Corp Filling structural cavities
US3306966A (en) * 1962-06-15 1967-02-28 Matejcek Franz Process for preparing compact expandable urethane foams
US3189669A (en) * 1962-11-01 1965-06-15 Goldfein Solomon Process for shipping flexible polyurethane foam
US3269887A (en) * 1963-08-07 1966-08-30 Dow Chemical Co Settable, flexible, foamed resins
US3306967A (en) * 1963-08-12 1967-02-28 Scholl Mfg Co Inc Molding of resinous foams
US3519708A (en) * 1966-11-21 1970-07-07 Dow Chemical Co Method of forming selectively permeable bodies from flexible polyurethane foam
US3493643A (en) * 1967-04-26 1970-02-03 Gilbert Schwartzman Method for making resilient foam applicators
US4077672A (en) * 1976-09-27 1978-03-07 Tantera, Inc. Method of making a sponge mop part
US4443286A (en) * 1980-01-23 1984-04-17 Ikeda Bussan Co., Ltd. Method of making cushion material from foam slabs and comminuted soft foam scrap
US4529569A (en) * 1983-09-29 1985-07-16 Margaret Palau Method of manufacturing an expandable spongy member
US5045267A (en) * 1988-02-03 1991-09-03 Coronet-Werke Heinrich Schlerf Gmbh Process and apparatus for producing bristle articles
US5538328A (en) * 1993-10-18 1996-07-23 Tucel Industries, Inc. Method of fusing filament to a sponge
US5792407A (en) * 1996-03-18 1998-08-11 Berzack; Jeffrey A. Method for attaching flexible, low density or compressible structures to injection molded polymer parts
US20090094768A1 (en) * 2005-09-09 2009-04-16 Colgate-Palmolive Toothbrush
AU2010227072B2 (en) * 2005-09-09 2012-06-28 Colgate-Palmolive Company Toothbrush
US8696964B2 (en) * 2005-09-09 2014-04-15 Colgate-Palmolive Company Method of manufacturing a toothbrush head
US9364075B2 (en) 2005-09-09 2016-06-14 Colgate-Palmolive Company Toothbrush
US20180177171A1 (en) * 2016-12-27 2018-06-28 Paul S. Kelley Method of manufacturing a fishing lure
US10561128B2 (en) * 2016-12-27 2020-02-18 Paul S. Kelley Method of manufacturing a fishing lure
US11701845B2 (en) * 2019-09-17 2023-07-18 Nike, Inc. Method for forming a composite sole structure component

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