DETAILED DESCRIPTION It is an object of this invention to provide a glass run of an automobile which can achieve the following effects (1) to (4).
(1) A seal lip is thickened in its wall thickness at its middle portion in a manner that the back side of the seal lip projects more to the other side at the middle portion than at its root portion, thereby forming a convex at the middle portion on the back side of the seal lip.
Accordingly, when a door glass moves, and a contact position on the door glass, where the door glass slidably contacts the seal lip, varies, the radius of curvature on the outer surface of the seal lip hardly varies over its full length except for the root portion of the seal lip.
Therefore, the contact width of the seal lip and the door glass, consequently, their contact area, hardly varies, which never causes adverse effect for slidable movement of the door glass.
(2) when the door glass moves, and the contact position on the door glass, where the door glass slidably contacts a seal lip, varies, the seal lip easily bends by its root because of the concave formed in the root portion on the back side of the seal lip.
Moreover, the elasticity of the seal lip is reinforced by a sponge elasticity-reinforcing member.
As a result, the door glass is prevented from rattling without increasing the force in controlling the movement of the door glass.
(3) When a door is strongly closed with the door glass being slightly opened, the door glass swings widely.
Even if the door glass swings widely, the seal lip is prevented from contacting a side wall of a channel portion by the sponge elasticity-reinforcing member intervening therebetween, which prevents generation of a contacting sound.
(4) With the sponge elasticity-reinforcing-member, occurrence of permanent set in fatigue or abnormal deformation of the seal lip is prevented, and the follow-up quality of the seal lip to the door glass and the sealing quality of the seal lip are not deteriorated.
A first invention resides in a glass run comprising a channel portion including a bottom portion and inner and outer side walls
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Gutter-related 
