Brush – broom – and mop making – Processes
Patent
1993-12-22
1995-02-21
Husar, John
Brush, broom, and mop making
Processes
A46D 304
Patent
active
053909844
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of producing tooth brushes with particular profiles of the tufts implanted in the head of the brush body.
After tufts of bristles have been implanted in the head portion of a brush body in conventional manner, the ends of the bristles can be trimmed to provide a desired profile different from a configuration wherein the ends of the bristles are aligned in a common plane. After the trimming of bristles, their ends are rounded to eliminate sharp edges. Such trimming and rounding of the bristle ends are additional finishing operations complicating the production of the tooth brushes and adding to the production costs.
The present invention provides a method of producing tooth brushes with particular desired profiles of tufts wherein the finishing steps of trimming and rounding of the bristle ends are eliminated.
More specifically, the present invention provides a method of producing tooth brushes wherein base members having through holes arranged in a pattern corresponding to the desired pattern of bristle tufts are provided and individual tufts of bristles to be implanted in these holes are picked from a supply of pre-cut bristles of equal length and having rounded utilization-side ends. Before their introduction into the holes of the base member, the tufts of bristles are introduced into through holes of a vise which are arranged in a pattern corresponding to that of the base member. Each hole of the vise is associated with clamping means for releasably clamping a tuft of bristles inserted therein. The ends of the bristles project from both sides of the vise. While the clamping means of the vise are in a released state, a die member having a profiled face is advanced with its face into engagement with the projecting ends of the bristles to push the bristles axially within the through holes, so that both ends of the bristles are aligned in parallel surfaces corresponding in shape to the profiled face. The clamping means are then engaged to hold the bristles in the vise while their ends are in an aligned state. The base ends of the bristles are then introduced into the holes of the base member. After the base ends of the bristles have been affixed to the base member, the clamping means of the vise are released, and the base member with the bristles attached thereto is removed from the vise. The base member with the bristles affixed thereto may then be further processed to yield a finished tooth brush. In a first embodiment, the base member is a brush body head having a recess in its rear face, the base ends of the bristles extending into this recess, and the recess is closed with a cover plate or filled with a molding material.
In another embodiment, the base member is a base plate adapted to be mounted in a recess of a brush body head. In another embodiment, the vise is part of one of the members of an injection mould delimiting a cavity wherein a brush body is moulded. In this embodiment, plastic material is injected around the base ends of the bristles.
According to a preferred embodiment, a counter-die member having a profiled face complementary to that of the die member is used, and the counter-die member is moved with its profiled face into engagement with those ends of the bristles opposite the ends engaged by the profiled face of the die member. The counter-die member is used to stop actual movement of the bristles pushed by the die member so that the bristle ends will be precisely aligned in a surface having the desired profile and configuration.
The supply of pre-cut and rounded fibers or bristles may be similar to that used in conventional tooth brush filling mechanisms, but the utilization-side ends of the bristles should be rounded so that a separate rounding step after implantation of the bristle tufts in the brush body head is avoided.
In order to pick individual tufts of bristles from the supply, a picking tube is used in the preferred embodiment. The picking tube has an internal channel corresponding in cross section to a desired cross-sectional shape
REFERENCES:
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patent: 3836199 (1974-09-01), Blankschein
patent: 4114221 (1978-09-01), Enchelmaier
patent: 4348060 (1982-09-01), Lewis, Jr.
patent: 4696519 (1987-09-01), Lewis, Jr.
patent: 4892698 (1990-01-01), Weihrauch
patent: 4979782 (1990-09-01), Weihrauch
patent: 5033797 (1991-07-01), Rueb
Boucherie Bart G.
Boucherie Leonel P.
G. B. Boucherie N.V.
Husar John
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