Brush – broom – and mop making – Processes
Patent
1990-08-21
1992-05-19
Coe, Philip R.
Brush, broom, and mop making
Processes
151672, 15172, 15DIG5, 4285428, A46D 300, A46B 904
Patent
active
051142147
DESCRIPTION:
BRIEF SUMMARY
With the present invention the particular aim is to be able to produce a toothbrush which is provided with groups of bristles arrnged so that these can produce effective cleaning of the surfaces of the tooth and adjacent gum portions including the depressions or the passages between the tooth surfaces and the gum portions together with the intermediate spaced between the teeth.
First and foremost, the aim is a process with which the production can be carried out as far as possible in a wholly automatised manner. In this connection, the objective is a process with which a tooth brush can be produced which a) is effective in use and for one thing has a design which is compact and takes little space at the same time as it provides good brushing effects, and which b) can be made in an accurate and reliable manner, with a favourable positioning of the groups of bristles relative to each other and, which c) can be designed so that the least possible collection of food residues, tooth paste residues, and the like results at the root of the groups of bristles.
According to the invention, a particular objective is a tooth brush having three head portions, that is to say a middle head portion and two lateral head portions which are arranged each on its respective side of the middle head portion and which are separated from the middle head portion by means of an intermediate passage portion with a cavity or attenuation groove.
Alternatively, tooth brushes can be designed with for example four, five or six separate head portions arranged in an angled or arcuate cross-sectional profile
The present invention is of particular interest in connection with the production of a tooth brush, such as disclosed in NO Patent Application 880072 and U.S. Pat. Nos. 4,876,157 and 4,938,539, but is not limited to such a mode of production. In said patent application there is disclosed a tooth brush construction where the second and third head portion are to be subjected, after the mounting of the groups of bristles in the different head portions, to a first bending with a negative angle of curvature and thereafter to a second bending with a positive angle of curvature. The first bending with a negative angle of curvature is employed in order to be able to cut the size and finally treat (polish) the groups of bristles to established, locally defined bristle lengths with a single finishing equipment. The second bending with a positive angle of curvature is employed in order to be able to fashion the head portions with their final angled contours relative to each other, where it is decisive that the groups of bristles converge towards each other in the manner precisely intended.
After the groups of bristles are placed in position in for example a first, second and third head portion--while these head portions are flush with each other in the starting position--there is relatively limited space for the heating equipment arranged between the groups of bristles. With a negative bending of the head portions such as disclosed in NO Patent Application 880072, there is provided a better space between the groups of bristles for the heating equipment prior to a positive bending of the head portions, that is to say prior to a bending in an opposite direction to the negative bending effected by way of introduction.
With the hitherto proposed solutions, the cavities and the attenuation grooves between the head portions on the bristle-carrying side of the head are designed, so that with the subsequent positive bending to the final form the bending has been able to be effected at the same time as the cavities become compressed, that is to say at the same time as the head portions on the bristle-carrying side are pushed tightly together towards each other.
A problem with the last-mentioned solution is however that in the tightly pushed together grooves on the bristle-carrying side of the head portion there is a tendency for pockets to be formed for the collection of food residues, tooth paste and the like.
With the present invention the aim is a soluti
REFERENCES:
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patent: 1901646 (1933-03-01), Hicks
patent: 1928328 (1933-09-01), Carpentier
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patent: 2244615 (1941-06-01), Garcin
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patent: 2807820 (1957-10-01), Dinhofer
patent: 3263258 (1966-08-01), Burge
patent: 4449266 (1984-05-01), Northemann et al.
patent: 4757570 (1988-07-01), Haeusser et al.
Coe Philip R.
Hand Francis C.
Spisich Mark
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