Brushing – scrubbing – and general cleaning – Implements – Brush or broom
Reexamination Certificate
2002-01-23
2004-11-02
Chin, Randall (Department: 1744)
Brushing, scrubbing, and general cleaning
Implements
Brush or broom
C015S172000
Reexamination Certificate
active
06810551
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a brush having a bristle carrier comprising at least two substantially parallel layers of different plastics, produced using the two-component injection molding process, and with bristles fixed to at least one of the layers.
Brushes produced in a two-component injection molding process are known in numerous different constructional forms. There are several reasons for constructing the bristle carrier from two different plastics. Thus, it can be advantageous for cost reasons alone to make a larger part of the bristle carrier from an inexpensive plastic, with the remainder being made from a higher grade, more expensive plastic, in order to obtain a cost saving. The higher grade plastic mainly fulfils strength functions, but can also fulfil special use functions. In addition, the plastic carrying the bristles can be chosen as a function of the bristle fastening mode. Fastening can take place in pre-shaped holes by punching, by injection molding of the fastening side ends in the plastic of the bristle carrier, by welding onto the bristle carrier or using other thermoplastic or mechanical processes.
From the manufacturing and also use standpoints special demands are made in the case of small brushes, particularly toothbrushes. A large number of bristles must be housed in a comparatively small surface area in order to bring about the cleaning action on the teeth and optionally a massaging action of the gums combined therewith. In addition, the large number of bristles must be housed on a bristle carrier with a small volume, because the bristle carrier must take account of the very different space conditions in the mouth of the maximum number of users. This makes necessary a narrow, flat brush head. The bristles must also have a high extraction resistance, which should be as constant as possible for all the bristles, because detached bristles not only lead to unpleasant effects in the mouth through jamming in the interdental gaps, but can also constitute a health hazard if they enter the esophagus or digestive tract.
A toothbrush head is made from two components (DE 3628722 Al) e.g. in order to wholly or partly envelop the brush head part having the necessary strength characteristics, which is made from a rigid plastic, with a softer, rubber-like material, e.g. an elastomer in order to reduce the injury risk in the mouth as a result of sharp edges and the like. In particular a layer-wise structure is known, in which the rigid plastic of the brush head is covered on its narrow sides and underside with the elastomer and the bristles are exclusively connected by welding to the elastomer layer. Through the fastening of the bristles in the elastomer layer the bristles also acquire a type of elastic mounting, which aids the sideways, elastic deflection of the bristles.
In another known construction (U.S. Pat. No. 1,770,195) the brush head of a hard material is integral with the handle and is completely surrounded by a rubber-like material provided on the bristle side with cup-shaped studs in which the bristle bundles are inserted, so as to acquire in this case again an additional springiness transversely to the bundle axis.
It is also known (U.S. Pat. No. 5,373,602) to construct the brush head in two parts, one part integral with the handle material and having a shorter construction, with the front end of the head being supplemented by a second elastomer part, which also engages over the top of the hard part and covers the latter. This is in particular intended to permit a bending of the front head part with respect to the rigid, short head part. If the handle and rear head part are made from conventional rigid plastics such as PS, PP, etc., these two different plastics cannot be adequately firmly interconnected, or this can only be achieved with considerable effort and expenditure. Conventional two-component injection molding processes are excluded, because the two plastics form no integral connection.
In another known construction (EP 310482) the brush head made from rigid plastic and in one piece with the handle is surrounded on the narrow sides and brush head end by an elastomer, whereas the bristles are exclusively fixed to the surface of the rigid part left free. This naturally leads to a deterioration of the area usable for the bristle configuration. The adhesion of the elastomer part compared with the aforementioned construction is improved in that said part engages in cap-like manner at the front end over the brush head and is fixed by a supplementary heat treatment on which EP 314482 provides no information.
It is finally known (WO 97/20484) to give a narrower construction to the hard part of the brush head in one piece with the handle in the longitudinal axis of the head and to increase the size in the vicinity of the front end to the contour dimension of the head. The narrow part forms the carrier for a type of skeleton structure with cup-shaped receptacles for the bristle bundles, said receptacles being made from the same rigid plastic. These cup-shaped receptacles are injected round with an elastomer, whilst completing the contour of the head and said elastomer may optionally surround the entire hard or rigid part. The bristles are partly fixed in the hard central part and partly in the cup-shaped receptacles of the elastomeric marginal parts. The latter are consequently able to give way in a flexible manner. In the latter construction as a result of the multiple penetration of the hard and soft components a secure connection between the two plastics can be assumed, but the structure of the brush head is extremely complicated and complicated injection moulds are required and the brush head flexibility desired in the case of toothbrushes is only obtained in the marginal areas and cannot be adapted to specific needs.
The problem of the invention, in the case of a brush, whose bristle carrier is made from different plastics, is to propose a construction which on the one hand permits an individual adaptation of flexibility to the particular requirements and on the other ensures a reliable and permanent connection between the two plastic components.
To solve this problem the invention is based on a brush having a bristle carrier comprising at least two substantially planar, parallel layers of different plastics produced in a two-component injection molding process, the bristles being fastened to at least one of the layers (DE 3628722). In a further development of this brush the problem of the invention is solved in that at least the bristle carrier layer remote from the bristles has openings, which are circumferentially closed and filled with the plastic of the other layer.
SUMMARY OF THE INVENTION
The invention firstly makes use of the clearly defined and relatively simple construction of the bristle carrier from substantially parallel layers offering for the at least two plastics large contact surfaces and correspondingly large adhesion surfaces as a consequence. In such a layer structure the use characteristics of the brush can be very precisely matched to the particular requirements without the need for complicated injection moulds for production purposes. It is in particular possible to very precisely adapt the flexibility over the entire length of the brush head or partial areas thereof to the given needs, by the selection of the plastics used, by a corresponding geometry of the layers and in particular the layer thickness with respect to the moment of inertia decisive for bendability. The circumferentially closed openings, which are provided at least in the layer remote from the bristle side are filled with the plastic of the other layer in two-component injection molding. This leads to an increase in the size of the adhesion surface and at the same time a type of tenon joint between the two layers, so as to permit an adequately firm and reliable interconnection of plastics, which are otherwise difficult to join together. In addition, the circumferentially closed openings, which lead to a weakening of the layer in which
Chin Randall
Coronet-Werke GmbH
Vincent Paul
LandOfFree
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