Reticulate heater for steering wheel

A reticulate heater for steering wheel, comprising:

• a reticulate heat generating element having a plurality of insulated heater wires braided in a mesh form, and having flexibility and elasticity which allow the reticulate heat generating element to bond tightly to a curved surface of a ring portion of the steering wheel,
• waterproof stretch-films which cover respective opposing surfaces of said reticulate heat generating element water-tightly, each stretch film having one surface bonded to said reticulate heat generating element in a state retaining the flexibility and the elasticity of said reticulate heat generating element, and
• an elastic adhesive which remains flexible and elastic after curing, which is applied over the whole one surface of each of said stretch-films, and which bonds said stretch-films and said reticulate heat generating element together water-tightly even if said stretch-films are stretched within the allowable range of tensile strength,
• wherein:
• said reticulate heater being fixed to the ring portion of the steering wheel, covering the entire circumferential surface of the ring portion of the steering wheel,
• said stretch films are each formed in a size which covers said reticulate heat generating element including an overlap width which has sufficient space for adhesion by said elastic adhesive,
• said stretch-films being flexible and elastic polyvinyl chloride stretch-films,
• said elastic adhesive being a synthetic rubber adhesive, a silicone-modified epoxy resin adhesive or a silicone rubber adhesive,
• said reticulate heat generating element, said two stretch-films and said elastic adhesive have said flexibility and said elasticity respectively,
• said reticulate heater has waterproofness by bonding said reticulate heat generating element and said elastic adhesive together water-tightly by said two stretch-films, and
• said reticulate heater is fixed at an outer diameter surface portion of the ring portion of the steering wheel by stretching, wherein said reticulate heater has shrunk toward an original size at an inner diameter surface portion of the ring portion of the steering wheel by the elastic restoring force of said stretch films, such that said reticulate heater is fixed at said inner diameter surface portion of the ring portion of the steering wheel.