Patents in subclass Pumps/Annular
Parent class: Pumps
| Number | Patent title | Issue Date |
|---|---|---|
| 06935850 | Axially aligned dual piston cylinder air pump with a common head portion A dual-direction pump includes two cylinders arranged on opposite sides of a head portion and an inlet return-flow prevention device and a leakproof device mounted between the cylinder and the head portion for avoiding leakage at the... |
08/30/2005 |
| 06923348 | Pump with pneumatic motor A pump having a compressed-air-operated reciprocating motor for reciprocating a pump plunger through forward and return strokes. The motor comprises a motor cylinder and a motor piston operable in the cylinder and itself acting as a valve... |
08/02/2005 |
| 06863526 | Lantern and fuel system A lantern and fuel system with a pump subassembly. The pump subassembly includes a beveled seat having an interior end with a cylindrical configuration constituting an interior guard with a first O-ring on the seat adjacent to the... |
03/08/2005 |
| 06832620 | Apparatus for dosing lubricant into an air line An apparatus for dosing lubricant into a compressed air flow includes a lubricant container, a pneumatically operated lubricant pump, an injection channel, a non-return valve interposed between the outlet of the pump and the injection... |
12/21/2004 |
| 06817060 | Collapsible handle device for inflator A collapsible handle device for an inflator comprises an air cylinder having a shaft lever and a hollow grip, in which one end of the shaft lever is connected to a piston inside the air cylinder, and the other end is provided with a... |
11/16/2004 |
| 06739842 | Pump A pump includes a base, a tubular portion formed on the base and with an upper end and a lower end, a pressure gauge communicated with the tubular portion near the upper end, a cylinder communicated with the tubular portion near the lower... |
05/25/2004 |
| 06514058 | Compressor having an improved valved piston device A compressor includes a piston slidably received in a chamber of a housing and having an annular groove for receiving a sealing ring, and having one or more conduits and having a number of openings communicating with the annular groove of... |
02/04/2003 |
| 06497560 | High volume low pressure air pump 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... |
12/24/2002 |
| 06315534 | Air compressor having easily assembled structure An air compressor includes a pressure gage attached to a cylinder housing, a compression device having a piston container slidably received in the cylinder housing for supporting a compression valve and a positioning block and a valve... |
11/13/2001 |
| 06280163 | Spring blade intake valve for air compressor An air compressor includes a piston slidably received in a housing, and a sealing ring engaged between the piston and the housing. The piston includes an aperture for air to flow into the housing. A spring blade has one end secured to the... |
08/28/2001 |
| 06273690 | Downhole pump with bypass around plunger The downhole pump has a barrel with a reciprocating plunger therein. The barrel has a first one-way valve, while the plunger has a second one-way valve. A barrel chamber is formed between the two one-way valves. The barrel chamber expands... |
08/14/2001 |
| 06241491 | Device for supplying an apportioned minimum amount of fluid The invention relates to a pulse-triggered device for supplying an apportioned minimum amount of fluid, particularly oil for lubricating pneumatic systems. A valve actuated positive-displacement member may be moved using a pulse-triggered... |
06/05/2001 |
| 6120266 | Piston mechanism with a flow passage through the piston A piston mechanism with a flow passage through the piston includes a cylinder which has a closable cylinder passage at one extremity thereof; a piston, axially movable in the cylinder, which has a closable piston flow passage and has in... |
09/19/2000 |
| 6099270 | Single-piece piston for use in a pneumatically-activated pump A single-piece piston for use in a pneumatically-activated pump or other metering device to meter a predetermined amount of lubricant or other liquid. The piston is disposed within a chamber of the body of the metering device. The piston... |
08/08/2000 |
| 6071097 | Single-piece piston for use in a pneumatically-activated pump A single-piece piston for use in a pneumatically-activated pump to meter a predetermined amount of lubricant or other liquid. The piston has a grooved end that includes a head portion and a circumferentially-disposed angled channel for... |
06/06/2000 |
| 6065947 | Two-stroke operable pump A pump includes a main body, a piston slidably received in the main body, and a hose having a first end attached to an end of the main body and a second end attached to the piston. A handle is attached to a piston rod, which, in turn, is... |
05/23/2000 |
| 6017196 | Bicycle inflator A bicycle inflator includes a cylinder having a cap fixedly received in a first end thereof and an end member fixedly received in a second end of the cylinder. The cap has a passage defined therethrough. The end member has a tubular... |
01/25/2000 |
| 6017201 | Air pump with a hidden extension tube An air pump is provided with an outer tube, a piston sealingly and slidably movable in the outer tube, an operating rod securely engaged with the piston and slidably received within the outer tube, a plug securely inserted into one end of... |
01/25/2000 |
| 5984652 | Single-piece piston with central bore for use in a pneumatically-activated pump A single-piece piston for use in a pneumatically-activated pump to meter a predetermined amount of lubricant or other liquid. The piston has a grooved end that includes a head portion and a circumferentially-disposed angled channel for... |
11/16/1999 |
| 5980222 | Hermetic reciprocating compressor having a housing divided into a low pressure portion and a high pressure portion A compressor assembly includes a compressor mechanism mounted within a hermetically sealed housing. The housing is effectively divided into a low pressure area at a relatively low temperature and a high pressure area at a relatively high... |
11/09/1999 |
| 5924602 | Air operated liquid pump An air operated liquid pump includes a pump with a reciprocating plunger driven by a piston contained in a cylinder. The plunger is connected to and reciprocates a dispensing piston that moves between two positions relative to the plunger... |
07/20/1999 |
| 5860798 | Pump for pumping a fluid comprising a liquefied gas and apparatus having a pump The pump has a sleeve-like bearer. This contains a bush in which a piston is displaceable along an axis. The bearer inner surface and the bush outer surface are adjacent to one another in parts and are separated from one another in parts... |
01/19/1999 |
| 5788463 | Manual vacuum producing system having pressure indicator A vacuum system comprising a vacuum pump and a vacuum indicator. The vacuum pump comprises a cylinder, a piston disposed in the cylinder, a piston rod fixed to the piston and extending through an end of the cylinder, the rod being movable... |
08/04/1998 |
| 5775885 | Combination suction manifold and cylinder block for a reciprocating compressor A hermetically sealed reciprocating refrigeration compressor has a suction gas arrangement including a suction gas plenum formed integral with a cylinder block for supplying suction gas directly to a cylinder so as to eliminate the need... |
07/07/1998 |
| 5775886 | Gas compressor with reciprocating piston with valve sheath A highly manufacturable gas compressor includes a sheath removably attached to a piston by several resilient fingers that snap into place at the bottom of the piston. The fingers act to limit relative motion between the piston and sheath... |
07/07/1998 |
| 5634780 | Hand pump of a drinking device for pumping water to a diver A drinking device for a diver includes a water container and a hand pump for pumping water to the diver's mouth. The hand pump includes a piston rod slidably engaged in a housing and two discs secured to the piston rod for separating the... |
06/03/1997 |
| 5611376 | Vacuum container A vacuum container including a container body, a cover covered on the container body, the cover having a top recess with air vents and a side opening, a switch mounted in the top recess and controlled by hand to close/open the air vents... |
03/18/1997 |