Patent ID: 9486062
Filing Date: 2016-11-08
CPC Classification: A46B

Claim Text:
1. A bristle of a liquid-dispensing hairbrush designed to deliver liquids to a user's scalp during hair-brushing only by gravity, and not by capillary action, comprising: a tube with a tube wall and an outer surface, and with an internal channel, wherein the internal channel has a maximum diameter and a length; and a roller-ball nozzle, wherein the roller-ball nozzle has a ball with a ball diameter, and a ball seat into which the ball movably fits, and wherein the ball seat has plurality of radially spaced apart inwardly directed protrusion portions with protrusion portion spaces therebetween and a ball space, and wherein the protrusion portions have apexes, wherein a central hole is defined by an imaginary circle which contacts the apexes of the protrusion portions, and wherein the central hole has a diameter, and wherein the ball seat has a minimum cross-sectional area which is free for liquid flow; wherein the protrusion portion spaces and the ball space are large enough so that liquid can flow through the protrusion portion spaces and through the central hole, and through the ball space in the direction from the liquid reservoir to the ball only by gravity, and not by capillary action; and wherein the protrusion portion spaces and the ball space are large enough so that external air can enter the roller-ball nozzle and travel up through the ball space and through the protrusion portion spaces, and through the central hole, and then through the internal channel of the tube even if the roller-ball does not contact a user's scalp; and wherein a ratio of 8<L/√S<25 is satisfied, where L is the length of the internal channel and S is a minimum cross-sectional area of the ball seat which is free for liquid flow; and wherein the ratio of L/M>8 is satisfied, where L is the length of the internal channel and M is the maximum diameter of the internal channel; and wherein the ratio of M/B<1.3 is satisfied, where M is the maximum diameter of the internal channel and B is the diameter of the ball.