# US 5,350,219 A · Toothbrush without metal gasket

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- Number: US 5,350,219 A
- Document ID: US5350219A
- Status: Granted
- Kind: A
- Application number: 08/096,883
- Filed: 1993-07-26
- Granted: 1994-09-27
- Earliest claimed: 1993-07-26
- Assignees: Acumen, Inc.
- Inventors: Huang Shou-Jen
- Web page: https://patentgrep.com/patent/US5350219A

## CPC

- A46D 3/00: Preparing, {i.e. Manufacturing} brush bodies
- A46B 3/08: by clamping
- B29C 45/14385: {Coating a portion of a bundle of inserts, e.g. making brushes}
- B29C 45/14467: {Joining articles or parts of a single article (B29C45/14377, B29C45/14385, B29C45/14581, B29C45/14614 and B29C45/006 take precedence)}
- A46B 2200/1066: Toothbrush for cleaning the teeth or dentures (A61C17/16 takes precedence; bristles arrangements for toothbrushes A46B9/04)
- A46D: MANUFACTURE OF BRUSHES
- A46B: BRUSHES (handles not integral with brushware B25G)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)

## Abstract

The present invention is related to a toothbrush without metal gasket which is characterized in the following design and process: it consists of a head and a body to wrap and fuse the head, wherein the head is provided with a plurality of bristles-setting holes for setting bristles therein by a toothbrush manufacturing machine. A cross clamping piece is formed at the bottom of each bristles-setting hole, and after the bristles are set in the bristles-setting hole and pass through the cross clamping piece, the bristles can be tightly fixed at the bottom of bristles-setting hole through the cross clamping piece; and when the head with bristles well set thereon is disposed in an extruding molding die of toothbrush body, the head can be wrapped and fused and fixed integrally with the toothbrush body by molding under pressure at a high temperature to form a toothbrush without any metal gasket.

## Claims

### Claim 1

A toothbrush manufacturing process comprising the steps of:
a. forming a plastic bristle carrier with first and second major faces, and an array of bristle-reception holes extending between said faces;
b. stuffing a bundle of bristles into each bristle-reception hole so that each bundle of bristles has anchored portions thereof extending entirely through the associated hole from said first face to a point slightly beyond said second face;
c. providing a toothbrush mold having a mold cavity that includes a first cavity section for forming the head of a toothbrush, and a second cavity section for forming the handle of a toothbrush;
d. inserting said bristle carrier into said first section of the mold cavity so that said second face of the carrier faces the cavity interior space;
e. introducing moldable plastic material into the mold cavity; and
f. heating the moldable plastic material under bristles and bristle carrier.

### Claim 2 (depends on 1)

The toothbrush manufacturing process of claim 1, wherein step (a) is carried out so that each bristle-reception hole comprises a circular opening extending from said first major face of the carrier to a point near the second major face, and a slot opening extending from said circular opening to said second major face; said step (b) being carried out so that the slot openings clamp the bristles to the carrier.

### Claim 3 (depends on 2)

The toothbrush manufacturing process of claim 2, wherein each slot opening has a cross shape.