Plurality of mass-produced multi-component plastic housings

    公开(公告)号:US10583625B2

    公开(公告)日:2020-03-10

    申请号:US14755277

    申请日:2015-06-30

    申请人: Braun GmbH

    摘要: A plurality of mass-produced multi-component housings having a length and comprising at least a first component comprising a first plastic material, a second component comprising a second plastic material, and a third component comprising a third plastic material. Each of the housings includes at least one tolerance-elimination element made of the second plastic material and longitudinally attached to the first component along the housing's longitudinal axis. The tolerance-elimination element has an average length extending parallel to the housing's longitudinal axis, which average length is at least ten times less than the length of the housing. The third component at least partially forms an outer surface of the housing, so that the tolerance-elimination element is at least partially overmolded by the third plastic material. The tolerance-elimination elements of the plurality of multi-component housings are structured to cause lengthwise maximal dimension variations of the length L among the individual multi-component housings to be not greater than 0.1 mm.

    Method and apparatus for manufacturing individual brush unit of rotary toothbrush

    公开(公告)号:US10398219B2

    公开(公告)日:2019-09-03

    申请号:US14892574

    申请日:2015-07-08

    申请人: KURUN CO., LTD.

    发明人: Isao Hayashi

    摘要: An apparatus for manufacturing an individual brush unit constituting a rotary brush by being stacked in multiple layers, includes an anvil having an insertion hole through which a filament group passes, a filament feeding unit which feeds the filament group from a feeder including a ring cutter on a tip and holds the filament group while a predetermined amount of the filament group protrudes outward from the insertion hole of the anvil, and an ultrasonic welder including a horn having a horn tip portion which pushes and radially expands a protruding tip of the filament group and welds a central part of the expanded filament group, to form the individual brush unit. A core of the welded central part is sandwiched between the ring cutter and the horn tip portion and is cut out, to simultaneously form a shaft hole and separate the individual brush unit from the filament group.

    Method for producing a core brush comprising polyvinyl formalin bristles

    公开(公告)号:US10029399B2

    公开(公告)日:2018-07-24

    申请号:US15465979

    申请日:2017-03-22

    发明人: Briant E. Benson

    摘要: A method of producing a brush for the cleaning of electronic components. In this method, a plastic core is prepared and submerged into a solvent to melt the outer surface of the core. While the outer surface of the plastic core is still partially melted, it is rolled through a trough of powdered polyvinyl alcohol (PVA) such that granules of PVA melt into and subsequently become embedded at the outer surface. As the solvent evaporates, the outer surface of the core re-hardens and the granules of PVA become firmly entrapped at the outer surface. The PVA covered shaft is placed in a mold, which is then filled with a PVA solution. As the solution cures, it forms a strong bond with the PVA granules that are embedded at the surface of the plastic core. Thereafter, the mold components are disassembled, leaving behind the finished cored brush.