Paint brush

Abstract

Described is a paint brush that includes: a handle; a ferrule secured to the handle; and a brush head including a plurality of synthetic bristle filaments extending in a longitudinal direction from the ferrule. The brush head has a width dimension and a thickness dimension in a plane perpendicular to the longitudinal direction, with the width dimension being greater than the thickness dimension. Each filament has a fixed end secured at the ferrule and an opposite free end longitudinally distant from the ferrule. The free ends of at least a portion of the filaments collectively define a substantially chisel-shaped tip profile in a plane perpendicular to the width dimension such that an apex of the chisel-shaped tip extends across the width of the brush head. Every filament in the brush head is tapered over at least 60% the filament length.

1 . A paint brush comprising:
 a handle;   a ferrule secured to the handle; and   a brush head comprising a plurality of synthetic bristle filaments extending in a longitudinal direction from the ferrule,   the brush head having a width dimension and a thickness dimension in a plane perpendicular to the longitudinal direction, with the width dimension being greater than the thickness dimension, and   each filament having a fixed end secured at the ferrule and an opposite free end longitudinally distant from the ferrule,   wherein the free ends of at least a portion of the filaments collectively define a substantially chisel-shaped tip profile in a plane perpendicular to the width dimension such that an apex of the chisel-shaped tip extends across the width of the brush head.   
     
     
         2 . The paint brush of  claim 1 , wherein the chisel-shaped tip is a symmetrical, rounded V-shaped tip with a rounded apex. 
     
     
         3 . The paint brush of  claim 2 , wherein sides of the V-shaped tip form an internal angle of less than 90 degrees. 
     
     
         4 . The paint brush of  claim 1 , wherein every filament in the brush head is tapered from its fixed end to its free end, with the taper of each filament extending over at least 60% of its length. 
     
     
         5 . The paint brush of  claim 4 , wherein each filament is tapered over at least 75% of its length. 
     
     
         6 . The paint brush of  claim 4 , wherein each filament is substantially linearly tapered. 
     
     
         7 . The paint brush of  claim 6 , wherein the thickness of each filament at its fixed end is substantially the same as the thickness of all other filaments. 
     
     
         8 . The paint brush of  claim 4 , wherein the thickness of each filament at its fixed end is in the range of 0.15 to 0.30 mm. 
     
     
         9 . The paint brush of  claim 4  wherein the thickness of each filament at its free end is in the range of 0.01 to 0.1 mm. 
     
     
         10 . The paint brush of  claim 1 , wherein the filaments within the brush head vary in length and at least a portion of the filaments have free ends which stop short of the chisel-shaped tip. 
     
     
         11 . The paint brush of  claim 10 , wherein filaments of varying length are distributed throughout the width and thickness of the brush head. 
     
     
         12 . The paint brush of  claim 11 , wherein a length of the shortest filaments is 30% to 60% of a length of the longest filaments, each measured from the ferrule to the filament tips. 
     
     
         13 . The paint brush of  claim 12 , wherein the length of the longest filaments is about 90 mm and the length of the shortest filaments is about 30 to 40 mm, each measured from the ferrule to the filament tips. 
     
     
         14 . A paint brush comprising:
 a handle;   a ferrule secured to the handle; and   a brush head comprising a plurality of synthetic bristle filaments extending in a longitudinal direction from the ferrule,   the brush head having a width dimension and a thickness dimension in a plane perpendicular to the longitudinal direction, with the width dimension being greater than the thickness dimension, and   each filament having a fixed end secured at the ferrule and an opposite free end longitudinally distant from the ferrule,   wherein every filament in the brush head is tapered from its fixed end to its free end, with the taper of each filament extending over at least 60% of its length.   
     
     
         15 . The paint brush of  claim 14 , wherein each filament is tapered over at least 75% of its length.