Patent ID: 8584455

Claim:
A heating and cooling device comprising: a cylinder including a chamber having an inner periphery, with a guiding groove defined in the inner periphery of the chamber, with the chamber adapted for receiving a gas; and a piston assembly movably received in the chamber of the cylinder, with the piston assembly including first and second pistons and a connecting rod connected to the first and second pistons, with each of the first and second pistons having a first side and a second side, with the first side of the first piston abutting against the second side of the second piston, with the first piston being relative to the connecting rod, with each of the first and second pistons including a plurality of openings extending from the first side to the second side, with the first piston further including an outer periphery having a guiding block, with the guiding block slideably received in the guiding groove to rotate the first piston for aligning or misaligning the openings of the first piston with the openings of the second piston.