Heated hair roller

Claim 1

In a heating roller comprising a substantially cylindrical hollow body carrying therewithin a reservoir for holding under pressure a combustible material which is liquefied under said pressure, and a catalyst which sustains combustion of said material when contacted thereby, said catalyst being in contact with the ambient air inside the roller and freely accessible from outside said roller, the improvement which comprises a member positioned between the reservoir and the catalyst through which said material gradually diffuses and expands under the pressure within the reservoir to provide a small substantially constant flow of combustible gas, said member defining at least part of one wall of a chamber on the side of said member remote from said reservoir, and an elongated longitudinally unobstructed duct between said catalyst and chamber having an inlet opening directly into said chamber and an outlet, said duct and chamber being substantially sealed against said ambient air except at said outlet, whereby said duct receives a flow consisting essentially of combustible gas from said member, and said duct being positioned to direct said flow through said ambient air against the center of said catalyst.