Patent ID: 6095762
Filing Date: 2000-08-01
Classification: F04B

Abstract:
An inflator mechanism comprising:a valve mechanism adapted for securing with a device to be inflated;a compressor mechanism fluidly coupled with said valve mechanism, said compressor mechanism accumulating fluid for inflating the device, said compressor mechanism including a motor mechanism for driving a piston, a piston, a piston cylinder, an outlet coupled between said piston cylinder and said valve mechanism, and a housing;a biasing member for exerting a force on said cylinder, said biasing member positioned in said housing;said biasing force maintaining said cylinder in a first position when fluid in said cylinder is at a low pressure and said cylinder moving in said housing against the biasing force of said biasing member to a second position when the fluid in said cylinder is at a high pressure;a displacement control valve means including an aperture and being associated with said piston cylinder for controlling displacement of the fluid such that, in a first position, the aperture is located below a bottom dead center position of the piston and, in a second position, the aperture is positioned above a bottom dead center position of the piston such that at low pressure, fluid displacement is high and as pressure in the cylinder increases, fluid displacement is reduced; anda power source for driving said motor.