Strip brush assembly having metal and polymer bristles and method of making
A strip brush assembly with a plurality of elongated polymer bristles forming a section and a plurality of elongated metal bristles forming another section adjacent the polymer bristles section, such that the metal bristles section is supported by the polymer bristles section. The polymer and metal bristles are bonded and encapsulated in a base formed by direct extrusion onto and around the polymer and metal bristles to secure them to the formed base. The strip brush assembly may be used on a tubular mandrel of a street sweeper.
1. A process of manufacturing a finished strip brush assembly for use with a strip brush having a cylindrical mandrel with a plurality of axial channels having a predetermined shape and size on the outer surface of the mandrel, comprising the steps of:
providing a plurality of pre-determined length polymer bristles that are adjacent to each other having first ends defining a generally planar first continuous layer;
providing a plurality of pre-determined length metal bristles that are adjacent to each other having first ends on top of said polymer bristles defining a generally planar second continuous layer, wherein said first ends of said plurality of metal bristles are in alignment with the first ends of said plurality of polymer bristles;
extruding a formed base that matches the shape and size of the channels directly onto and around said first ends of said plurality of polymer and metal bristles to bond and encapsulate said plurality of polymer and metal bristles in said formed base to be closely adjacent each other in a continuous fashion, with said first continuous layer of polymer bristles stacked above said second continuous layer of metal bristles;
cooling said formed base; and
cutting said formed base to a pre-determined length to form a strip brush assembly having uninterrupted, continuous, polymer and metal bristles with said first continuous layer of polymer bristles stacked above said second continuous layer of metal bristles across the entire length of the strip brush assembly for inserting said formed base directly into an axial channel of the cylindrical mandrel.
2. The process of claim 1 further comprising the step of:
providing a length of metal wire;
crimping said length of metal wire to form waves having a generally uniform amplitude;
cutting said length of metal wire to a pre-determined length to form a plurality of metal bristles.
3. The process of claim 1 wherein said polymer bristles form a distinctive polymer bristles section having at least one layer of polymer bristles and said metal bristles form a distinctive metal bristles section having at least one layer of metal bristles abutting said polymer bristles section.
4. The process of claim 1 wherein said first ends of said polymer bristles are pre-heated.
5. The process of claim 1 further comprising the step of polishing said formed base.