Accessory device for an inflatable gas balloon

An accessory device for an inflatable gas balloon having an elastically expansible balloon neck integrally formed with an inflatable balloon body, comprising:

• a cup-shaped housing having an open end defining a rim, a closed bottom end and a shell extending from the rim of said open end down to the closed bottom end and defining a substantially cylindrical outer surface, the housing being adapted for insertion with its open end first into said balloon neck after having the balloon neck elastically expanded, such that the entire length of the expanded balloon neck is elastically tensioned in gas tight fashion against said cylindrical outer surface for retaining said balloon without substantial extension into said balloon body, said housing being made of injection-molded molded plastic material;
• an electric lamp bulb of a cross-sectional size substantially smaller than the inside cross-section of the housing, said lamp bulb being mounted with a first screw-type bulb cap;
• a reflector inserted into said shell at said open end of the housing and fixed to said shell to extend within the housing in spaced relation to said closed bottom end to define a chamber in the housing between the reflector and the closed bottom end, said reflector having a concave reflector surface adjacent the open end of the housing and surrounding a screw-type lamp socket receiving said first screw-type bulb cap, such that the lamp bulb is radially spaced substantially away from the rim of the shell at the open end of the housing and said concave reflector surface radially surrounds said bulb, said reflector occupying substatially completely the inside cross-section of the open end of the housing between said lamp socket and said shell, said lamp socket being connected to electrical conductors extending from said lamp socket towards said closed bottom end and being passed through said closed bottom end in a gas tight manner;
• a second screw-type bulb cap externally mounted at the closed bottom end of the housing and electrically connected to said electrical conductors;
• a transparent cap extending the shell of the housing at the open end thereof and being fitted on the open end of the housing to externally surround said lamp bulb, a closable gas feed duct formed at the shell near the bottom end of the housing, said gas feed duct oepning into said gas space;
• a first opening means passing said reflector from said chamber ot the open end of the housing, and
• a second opening means passing said transparent cap from the open end of the housing to the outside of the transparent cap,
• whereby gas can be passed through the gas feed duct, the gas space and the first and second opening means for inflation of the balloon body retained by said housing.