Free piston vacuum producing apparatus

Details Free piston vacuum producing apparatus Free piston vacuum producing apparatus

2002-12-12

2008-12-23

Cronin, Stephen K (Department: 3747)

Internal-combustion engines

Free piston

Single chamber; one piston

Reexamination Certificate

active

07467607

ABSTRACT:
The free piston vacuum producing apparatus is an internal combustion device with no piston rod or constraining mechanism attached to the free piston. After fuel ignition the piston is rapidly propelled toward the open end of a cylinder. As the combustion gases expand, the piston's momentum propels it past the point where the pressure is equal on both sides of the piston. A vacuum is created in the cylinder behind the piston. When the piston comes to a stop, the vacuum in the cylinder is secured. An air/gas/vapor entry port into the cylinder is then opened to allow outside air, gas, or vapors to enter the cylinder. The gases drawn into the cylinder's vacuum pass through a device, such as a turbine, in order to produce work or energy from the flowing gases. The cylinder's vacuum can thus be used as the basis for vacuum pumps, evaporators, or gas evacuation device.

REFERENCES:
patent: 168623 (1875-11-01), Daimler
patent: 178023 (1876-05-01), Otto
patent: 4399368 (1983-08-01), Bucknam
patent: 4484082 (1984-11-01), Bucknam
patent: 4491095 (1985-01-01), Coad
patent: 5144917 (1992-09-01), Hammett
patent: 6213097 (2001-04-01), Maucher

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