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A high-volume low pressure hand operated air pump comprised of a tube body with a plunger shaft inserted into one end thereof and a check valve at the other end thereof with a floating seal secured to the internal end of the plunger shaft comprised of a captured double sided annular disk having a cl

A high-volume low pressure hand operated air pump comprised of a tube body with a plunger shaft inserted into one end thereof and a check valve at the other end thereof with a floating seal secured to the internal end of the plunger shaft comprised of a captured double sided annular disk having a closed cell foam plastic seal on one side thereof and a plastic stiffener of the same plastic material integrated thereto for supporting the foam sealing side thereof

대표청구항 ▼

1. A high volume low pressure air pump comprisingan elongated tube body having a guide hole located proximate to a first end thereof and disposed on the cylindrical axis of said tube for surrounding the shaft of a plunger, said body forming an air chamber between the internal end of said plunger sha

1. A high volume low pressure air pump comprisingan elongated tube body having a guide hole located proximate to a first end thereof and disposed on the cylindrical axis of said tube for surrounding the shaft of a plunger, said body forming an air chamber between the internal end of said plunger shaft and a second end of said tube, an air intake passage disposed proximate said first end of said tube for allowing the intake of air into said tube through said passage, a plunger shaft disposed partially internally of said tube body and extending through said guide hole of said body and formed to reciprocate therein, said shaft including a handle secured at a first externally exposed end thereof, the length of said shaft being longer than the length of said body, an air intake floating seal secured to the internally disposed second opposite end of said shaft, said air intake seal including a piston secured to said second end of said plunger, said piston having its longest cross-wise dimension shorter than the internal diameter of said tube body whereby said the plunger can freely reciprocate in said tube and air can bypass around the edges of said piston as said plunger is withdrawn from said body, a circular seal engaged in a restrained floating relation to said piston on said air chamber side thereof and having a first side comprised of closed cell plastic foam, said first side being larger in diameter than the internal diameter of said tube body, and being frictionally engaged in sealing relation with the internal wall of said tube body, said circular seal having a second plastic stiffener side smaller in diameter than said internal diameter of said body and forming a backing to said foam side of said seal on said air chamber side of said seal and being disposed in facing relation to said piston on said air chamber side thereof, said stiffener side of said seal being comprised of the same material as said closed cell foam and integral thereto, said circular seal having at least one air passage formed there through which is closed when said seal is pressed against said piston, a circular seal cage having at least one central pedestal removably in secured to said piston on the air chamber side thereof and forming at least three radially outward projecting cantilevered bridge ring seal retainers disposed at equally spaced positions from each other, said retainers each being equally spaced from said piston a distance greater than the thickness of said circular seal to permit movement of said seal away from said piston a predetermined distance parallel to the cylindrical axis of said tube, said circular seal being captured between said outward projecting cantilevered bridges on the air chamber side of said piston and encircling the outer periphery of said central pedestal, a check valve disposed proximate to said second end of said tube and having an air flow block side and an air flow discharge side, said air block side being disposed to communicate with said air chamber of said body, an air delivery tube connected to said air flow discharge side of said check valve, whereby as said plunger is withdrawn from said tube body said check valve closes and said circular seal unseats from said piston and said circular seal cage captures said floating circular seal in restraining contact for stabilization thereof in perpendicular relationship with respect to the cylindrical axis of said tube body and said interior wall of said body at said pre-determined distance from said piston thereby allowing air to pass around the peripheral edges of said piston and to flow into and through said the air passages of said circular seal and into said air chamber, and whereby as said plunger is pushed into said tube body said the check valve opens and said circular seal seats against said piston closing said air passages in said circular seal and air is forced out from said air chamber through said check valve into said delivery tube.