Brush – broom – and mop making – Processes
Patent
1988-04-14
1990-06-26
Rosenbaum, Mark
Brush, broom, and mop making
Processes
A46D 100
Patent
active
049366335
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the production of bristle articles with a bristle carrier having on opposite sides at least one hole for receiving individual or bundlewise-combined plastic bristles for forming a bristle system on the opposite sides, as well as to bristle articles produced by this process.
Typical examples of bristle articles of the aforementioned type are hand washing brushes or toothbrushes with bristles on both sides, belts, bands or disks for industrial purposes with bristles on both sides, particularly for brushing machines, or mats provided on both sides with bristles, e.g. door mats. Such bristle articles have hitherto been produced in that the case of rigid bristle carriers, whereof both sides have blind holes, usually in reciprocally displaced form and in said holes are introduced the bristles, said bristles then being anchored in the holes. In the case of thin, flexible bristle carriers use is made of a perforated or fabric-like structure and bristles are threaded through the open structure and mechanically fixed to the bristle carrier. The processes are complicated and expensive from the manufacturing standpoint.
As a result of the increasing use of plastic bristles and bristle carriers made from plastics efforts have been made for many years in the case of bristle articles with bristles on one side to interconnect the bristle carrier and bristles by welding. The ends are pressed flush on to the also melted surface of the bristle carrier. The joint is formed following the solidification of the melt.
Problems occur with regards to the choice of plastics in the case of butt welding. In a manner satisfactory for continuous loading, it is only successful when the same materials are used for the bristles and bristle carrier. However, due to the fact that they are loaded, the bristles are made from relatively high quality plastics, so that the same high quality plastics must be used for the bristle carriers, which would not in fact be necessary from the manufacturing standpoint. Therefore the product is made unnecessarily expensive.
Unequal material pairs can be used if the bristles are inserted in blind holes and the latter have undercuts, behind which the melt can flow in order to obtain a completely satisfactory anchoring. However, the production of such undercuts in blind holes is only possible through the use of expensive tools.
For the production of a circular or cylindrical bristle article, it is also known to shape the planar, open structure with the edges and accompanied by the overlap thereof to form a ring and the melted end is forced by bristle bundles through the overlap zone. Following solidification, not only are the bristles anchord, but the ring is also closed.
The aforementioned prior art is described in DE-OS 23 35 468, the latter publication constituting an example for the entire field of the welded or melting connection of bristles and bristle carriers.
The problem of the present invention is to provide a process for the production of bristle articles with bristles on both sides, as well as bristle articles of this type, which allows a simple and inexpensive manufacture and a reliable anchoring of the bristles in the bristle carrier, whilst allowing a random material choice for the bristle carrier.
According to the invention this problem is solved in that the holes are formed in the bristle carrier in such a way that they pass into one another, that the bristles supplied from either side to the bristle carrier are melted at their ends facing said bristle carrier and are introduced into the opposite holes until there is engagement with the melt within the holes.
Unlike in existing technology, in which the bristles or bristle bundles are in each case only connected to the bristle carrier, according to the present invention the bristles on one side of the bristle carrier directly engage with the bristles on the other side, so that the melted ends are interconnected in the case of weldable plastics, or in the case of non-weldable plastics press against the wall
REFERENCES:
patent: 3053575 (1962-09-01), Zeilstra
patent: 3471202 (1969-10-01), Lewis, Jr.
patent: 3836199 (1974-09-01), Blankschein
Coronet-Werke Heinrich Schlerf GmbH
Rosenbaum Mark
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