Helical brush

Abstract

An improved rotary helical brush comprising a rotary axle and two helical brushing members slipping over the rotary axle, the helical brushing members are planted with bristles on surfaces of their corresponding continuous helical frames and are assembled by rotating in mutual contrary directions. The rings of one of the two helical brushing members are arranged alternately relative to rings of the other helical brushing member, the degrees of inclination of bristles on every ring of the helical frames are increased to increase the contact areas between the bristles on each ring and the surface of a plate being cleaned. Thereby the rotary axle rotates slower to reduce the centrifugal force and vibration, and thereby scrapes created on the surface of a plate can be reduced.

1 . An improved rotary helical brush, said rotary helical brush comprises a rotary axle and at least a first and a second helical brushing member slipping over said rotary axle, rotating of said rotary axle moves and rotates said two helical brushing members; said two helical brushing members are planted with bristles on surfaces of two corresponding continuous helical frames and are assembled to be alternately rotated, thereby rings of said first helical brushing member are arranged alternately relative to rings of said second helical brushing member and are mutually very close, degrees of inclination of bristles on each of said rings of said helical frames are increased to increase contact areas between said bristles on each of said rings and a surface of a plate being cleaned. 
   
   
       2 . The improved rotary helical brush as claimed in  claim 1 , wherein bristles on said second helical brushing member is substituted by sponge. 
   
   
       3 . The improved rotary helical brush as claimed in  claim 1 , wherein said rotary helical brush comprises three or more than three helical brushing members, rings of each of said helical brushing members are arranged alternately relative to rings of the remains of said helical brushing members, all said helical brushing members are assembled by rotating in directions contrary to one another.