Patent ID: 7217306

Claim:
A trap apparatus comprising: an exhaust passage for evacuating a hermetically sealed chamber by a vacuum pump; a hermetically sealed trapping and regenerating casing extending across said exhaust passage; a regenerating passage adjacent to said exhaust passage; a trap unit movably housed in said trapping and regenerating casing for selective movement between a trapping position connected to said exhaust passage and a regenerating position connected to said regenerating passage, said trap unit being mounted on a shaft, wherein said trap unit has disk-shaped cooling bodies in said casing and cooling fins disposed between the disk-shaped cooling bodies, and said cooling fins comprise fins of arcuate shape and fins of flat shape, and wherein each disk-shaped cooling body includes an internal cooling jacket so that coolant can be supplied through a pipe in the shaft to said cooling jacket, and said coolant jacket has a coolant inlet port and a coolant outlet port in the disk-shaped cooling body.