Method of making rotary brush with removable brush elements

• US 5,045,091 A
• Filed: 02/05/1991
• Issued: 09/03/1991
• Est. Priority Date: 06/26/1987
• Status: Expired due to Fees

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Abrahamson, Gerald R., Duwell, Ernest J.
• Primary Examiner(s): Schmidt, Frederick R.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/652,383
• Time in Patent Office: 210 Days
• Field of Search: 51/334, 15/183
• US Class Current: 51/293
• CPC Class Codes: A46B 7/04 interchangeably removable bristle carriers
• CPC Class Codes: A46B 7/044 Sliding connections for bristle carriers
• CPC Class Codes: A46B 7/10 as a rotating cylinder
• CPC Class Codes: B24D 13/10 comprising assemblies of brushes

Abstract

A rotary brush with removable brush elements is provided. The brush elements are disposed on a hub in a radial display. The brush elements include a resiliently flexible element which permits the brush to deflect at a greater angle from a rest position than the angle of deflection of the bristles of the brush from a normal position when the hub is rotated with the bristles in contact with the workpiece.

Claims

1. Method of making a brush element, said method comprising the steps of:

(a) forming a dead soft, cold rolled steel plate to provide a U-shaped metal channel having sidewalls extending in the same direction from a channel bottom;

(b) folding a segment of polymer reinforced fabric having opposite terminal ends at its longitudinal center to form a temporary looped end with the folded portions of the fabric touching between the looped end and the terminal ends of the fabric;

(c) fastening together the touching folded portion of the fabric to provide a permanent looped end and unfastened terminal ends;

(d) adhesively bonding one terminal end of the fabric segment over each opposite sidewall of said U-shaped metal channel with the fabric adjacent the exterior of the metal channel so that the permanent loop projects from said channel bottom in an opposite direction as said sidewalls;

(e) inserting into said U-shaped channel a plurality of filaments folded at their midportion;

(f) locking the folded filaments into the channel by placing a core rod over the folded midportion of said folded filaments; and

,

(g) crimping the metal channel locked core rod and filament midportions inside the metal channel to provide said brush element.

2. Method of making a rotatable brush, said method comprising:

(a) preparing a plurality of brush elements according to claim 1;

(b) providing rotatable hub having a peripheral surface and opposite side edges, said hub being slotted to provide a plurality of circumferentially spaced brush fastening slots, each of said slots being open to said peripheral surface and to said side edges and being shaped to have a larger opening at said side edges than at said peripheral surface;

(c) inserting the looped ends of said brush elements into said slots by sliding said looped end from the side edge of said slot into said opening; and

(d) inserting an element into each of said loops of said brush elements which is of a size which prevents the withdrawal of said brush element through said peripheral surface while said hub is rotated in use.

3. Method of making a brush element, said method comprising the steps of:

(a) folding a segment of polymer reinforced fabric having opposite terminal ends at its longitudinal center to form a temporary looped end with the folded portions of the fabric touching between the looped end and the terminal ends of the fabric;

(b) fastening together the touching folded portions of the fabric to provide a permanent looped end and touching terminal ends;

(c) assembling a stack comprised of sheets having a bundle of filaments between each of said sheets with the touching terminal ends of said fabric segment within the stack; and

(d) mechanically fastening together the sheets, filaments and fabric ends in said stack to provide said brush element.

4. Method of making a rotatable brush, said method comprising:

(a) preparing a plurality of brush elements according to claim 3;

(b) providing rotatable hub having a peripheral surface and opposite side edges, said hub being slotted to provide a plurality of circumferentially spaced brush fastening slots, each of said slots being open to said peripheral surface and to said side edges and being shaped to have a larger opening at said side edges than at said peripheral surface;

(c) inserting the looped ends of said brush elements into said slots by sliding said looped end from the side edge of said slot into said opening; and

(d) inserting an element into each of said loops of said brush elements which is of a size which prevents the withdrawal of said brush element through said peripheral surface while said hub is rotated in use.