Process for making toothbrushes
View Patent ↗A process for making a toothbrush head comprising widthways adjacent sections, the process comprising the stages of first making the head in an injection moulding process with the sections relatively spaced apart from each other in a widthways direction, then secondly moving the sections of the so formed head relatively spaced closer to each other in a widthways direction. An apparatus for performing the process is also disclosed.
1. An apparatus adapted to be supplied with a plastics material skeleton of a toothbrush comprising a handle part and at least two sections spaced apart adjacent to each other on opposite sides of a toothbrush longitudinal direction, each section comprising a head part adapted to carry bristles and a neck part by which the head part is integrally connected to the handle, the sections being flexibly integrally linked to each other, the apparatus being adapted to move the head part and the neck part of the sections relatively closer together, the apparatus comprising a mould cavity to contain the handle part and the immediately longitudinally adjacent part of the neck parts, and further comprising means to inject a hot elastomeric material into the mould cavity to flow around and/or between the sections.
2. An apparatus according to claim 1 comprising first and second part moulds which can mate together and which incorporate first and second part mould cavities which when the first and second part moulds have mated together form a mould cavity capable of receiving said handle part and the immediately longitudinally adjacent part of the neck parts, and the apparatus incorporates one or more abutment surface positioned such that as the part of the skeleton and a part mould cavity relatively come together, one or more abutment surface abuts against at least one of the sections to urge the sections into the closer spaced together relationship.
3. An apparatus according to claim 2 wherein an abutment surface is provided by one or more of the part mould cavities having a ramp profiled abutment surface so that as a section is received by the part mould cavity, the ramp profiled surface abuts against the section to urge the section toward the closer spaced together relationship.
4. An apparatus according to claim 2 wherein an abutment surface is provided by a mould cavity capable of receiving the grip handle part and the neck part of the sections immediately adjacent to the grip handle part, but such that the head part of the section and the neck part of the section adjacent the head part extend outside of the part mould cavity, and an abutment surface is outside of a part mould cavity and positioned so that a section and the abutment surface may be brought into contact before the part moulds mate so that the abutment surface abuts against the section to urge the section toward the closer spaced together relationship.