Distributor cap and dust shield with hermetic sealing and moisture detection apparatus

A spark ignition distributor cap assembly comprising in combination:

• A. a distributor cap fabricated from a plastic material comprising a cup-shaped member having an interior defined by an inner surface and an exterior defined by an outer surface with a circumferentially extending lower end intermediate said surface, said cap being at least partially translucent to permit viewing through said surfaces,
• B. a base having a circumferentially extending upper end adapted to receive said lower end of said distributor cap in overlapping relationship therewith,
• C. coupling means for removably securing said cap to said base during use of the ignition cap assembly,
• D. sealing means operatively associated with said cap and said base to provide a multiple barrier therebetween so as to prevent liquid such as road water splash or the like from entering the interior of said cap,
• E. said sealing means comprises:
• (1) a plurality of circumferentially extending concentrically formed grooves on said cap, each one of said grooves having an inner end terminating below said lower end of said cap, and
• (2) a plurality of circumferentially upwardly extending annular ribs formed on said base, each one of said ribs concentrically formed relative to each other and having a terminal end above said upper end of said base, said ribs adapted to extend in interfitting relationship with each other when said coupling means secures said cap and said base in assembled relationship to each other,
• F. engaging means operatively associated with each one of said ribs and said grooves, said engaging means comprising inclined surfaces on said ribs and said grooves for abutting engagement therebetween, each one of said corresponding pair of inclined surfaces of each one of said mating ribs and grooves providing sealing engagement therebetween such that a liquid barrier is obtained,
• G. detecting means operatively associated with said cap for indicating by visual means the moisture condition of the air within said cap, said detecting means comprises a chemical compound that changes its color when hydrated or percipitated,
• H. housing means mounted on said cap for receiving said detecting means therein, said housing means including an aperture communicating with said inner surface for receiving said detecting means therein,
• I. mounting means operatively associated with said housing means for permitting removal of said detecting means from said cap so as to facilitate replacement of said chemical compound,
• J. said mounting means comprising a threaded aperture on said cap and said housing means is threaded at one end thereof to be received in said threaded aperture.

A spark ignition distributor cap adapted to be assembled on a base, comprising:

• A. a cup-shaped cap member fabricated from a plastic material and having an interior defined by an inner surface and an exterior defined by an outer surface with a circumferentially extending lower end intermediate said surfaces,
• B. detecting means operatively associated with said cap for indicating by visual means the moisture condition of the air within said cap when assembled with the base, said detecting means comprises a chemical compound that changes its color when hydrated or percipitated,
• C. housing means mounted on said cap for receiving said detecting means therein,
• D. said housing means being contained on said inner surface and includes an aperture adapted to receive said detecting means therein, and
• E. magnifying means on said outer surface in overlapping relationship to said housing means so as to obtain an easier indication of the color of said detecting means, said magnifying means being provided on top of said cap so as to be readily visible, and integrally formed with said housing means.

A spark ignition distributor cap assembly comprising in combination:

• A. a distributor cap comprising a cup-shaped member having an interior defined by an inner surface and an exterior defined by an outer surface with a circumferentially extending lower end intermediate said surfaces,
• B. a base having a circumferentially extending upper end adapted to receive said lower end of said distributor cap in overlapping relationship therewith,
• C. coupling means for removably securing said cap to said base during use of the ignition cap assembly,
• D. sealing means operatively associated with said cap and said base to provide a multiple barrier therebetween so as to prevent liquid such as road water splash or the like from entering the interior of said cap,
• E. said sealing means comprises:
• (1) a plurality of circumferentially extending concentrically formed grooves on said cap, each one of said grooves having an inner end terminating below said lower end of said cap, and
• (2) a plurality of circumferentially upwardly extending annular ribs formed on said base, each one of said ribs concentrically formed relative to each other and having a terminal end above said upper end of said base, said ribs adapted to extend in interfitting relationship with each other when said coupling means secures said cap and said base in assembled relationship to each other,
• F. engaging means operatively associated with each one of said ribs and said grooves, said engaging means comprising inclined surfaces on said ribs and said grooves for abutting engagement therebetween, each one of said corresponding pair of inclined surfaces of each one of said mating ribs and grooves providing sealing engagement therebetween such that a liquid barrier is obtained, and
• G. said ribs and said grooves form a series of steps extending upwardly and inwardly from said exterior to said interior of said cap, with each said terminal end of each one of said ribs extending above the elevation of the preceding one of said ribs, and said inclined surface of each one of said ribs and each one of said grooves being in abutting engagement with each other.