Cylindrical brush
AssigneeMinnesota Mining and Manufacturing Company
InventorEugene J. Dupre
Life of this patent
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Abstract
Cylindrical brush and method of making thereof. The brush comprises an inner layer formed from a first strip of fabric helically wound to form a hollow cylinder, an outer layer formed from a second strip of fabric helically wound over said first strip, a third layer of adhesive interposed between said first and second layers. The curve of the helix formed by the second fabric strip intersects the curve of the helix formed by said first fabric strip. The peripheral surface of the second fabric strip also has bristles attached to it.
Claims12
A cylindrical brush comprising
- (a) an inner layer comprising a first elongate fabric strip formed of low-stretch cloth having a tensile strength greater than 200 psi and less than 8% stretch at 100 lbs. load and having parallel sides wound into a first helix with adjacent coils in said first helix abutting to provide a cylindrical shell having a hollow core,
- (b) an outer layer comprising a second elongate fabric strip having parallel sides wound into a second helix with adjacent coils in said second helix abutting to provide a substantially continuous outer surface, said outer layer contacting and overlapping said inner layer, the curve formed by said second helix intersecting the curve formed by said first helix,
- (c) adhesive material interposed between said layers to adherently bond together said inner layer and said outer layer;
- and
- (d) bristles fastened to and covering at least a portion of the outer surface of said outer layer.
Method of preparing a cylindrical brush comprising the steps of:
- (a) providing a cylindrical mandrel having two ends and comprising a plurality of separable elongated elements, which elements, when separated, form a circumferential plane having greater circumference than when unseparated,
- (b) inserting at each end of said mandrel a means for separating said elongated elements,
- (c) winding a first elongate fabric strip formed of low-stretch cloth having a tensile strength greater than 200 psi and less than 8% stretch at 100 lbs. load helically around said mandrel and in contact therewith,
- (d) applying to at least one of said first fabric strip or to a second elongate fabric strip a curable adhesive material,
- (e) while said adhesive material is still uncured, winding said second elongate fabric strip helically over said first strip and in contact therewith, the curve of said first helix intersecting the curve of said second helix, said first strip and said second strip forming a hollow cylinder,
- (f) curing said adhesive material to form an adherent bond between said first fabric strip and said second fabric strip,
- (g) removing aaid separating means to allow said elongated elements to become unseparated,
- (h) removing said mandrel from said hollow cylinder.
Dependencies are inferred from the claim text.