Pumps – Expansible chamber type – Plural pumping chambers
Reexamination Certificate
1999-04-23
2001-05-22
Walberg, Teresa (Department: 3742)
Pumps
Expansible chamber type
Plural pumping chambers
C092S256000
Reexamination Certificate
active
06234774
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention concerns pumps for fluids generally.
The most widely used pumps for fluids are the double-acting type in which there is an alternating piston that, drawing in a fluid, simultaneously compresses the fluid drawn in during the piston's previous stroke made in the opposite direction.
These devices are usually complex and bulky because of the need for valves to permit entry of air and exit of compressed air at each stroke of the piston.
Elastic means of reaction are used to return the valves to their closed position and re-open them, in line with the action of the moving piston and create a cyclic distribution of the fluid at the desired pressure, quantities and delivery.
Especially in the nautical field where such wide use is made of inflatable rubber craft, the possibililty of rapidly inflating them with light simple and compact means is of decisive importance.
The chief advantage of having a rubber dinghy lies just in the fact of being able to turn an easily-stowed object like a deflated dinghy into a real boat, even of some considerable size.
The presently known hand-operated pumps are tiring to use; motor-driven ones are excessively bulky and expensive.
SUMMARY OF THE INVENTION
It is therefore clear that such pumps are for the most part unsatisfactory on account of their cost, weight and the difficulty of using them.
The present invention eliminates these problems by proposing a pump that offers many advantages such as lightness, compactness, long life and simplicity in use as will be explained below.
Subject of the invention is a double-acting pump expecially for types of inflatable rubber boats.
This pump has a main cylindrical body in which a piston slides, with end chambers closed by flat bodies that serve as heads and also as valves. Therefore, when the piston moves in one direction, the valve of the head left free automatically opens and the valve of the head which the piston approaches automatically closes, the effect being to produce suction in the chamber formed when the piston moves away and simultaneous compression in the chamber to which said piston is directed.
The opposite phenomena occur when the piston changes direction. The valves are formed of an elastic diaphragm adhering to the inner face of the head on an area perforated with holes through to the open air. The effect of suction automatically distorts the membrane drawing it into the chamber, detaching it from the air entry holes, while the effect of compression is to make the diaphragm adhere to the inner face of the head and so keep the valve closed.
Alongside the main cylindrical body and in one piece with it, is an oblong secondary cylindrical body similarly extending from one head of the pump to the other.
Apertures are made in the ends of said secondary cylindrical body for communication with the chambers formed in the main cylindrical body by movement of the piston.
Said ends of the secondry cylindrical body are closed by small cylindrical valves with inward-facing bases.
Said bases each have a set of holes passing through them and comprise inward-facing elastic diaphragms that adhere to the faces of said bases. Between the small valves on the secondry cylindrical body there is a branch for external connection.
Therefore, when suction is taking place in one chamber in the main cylindrical body, the valve on the secondary cylindrical body placed at the end connected with said chamber continues, due to the effect of suction, to remain closed by adherence of the diaphragm to the perforated base of the small valve concerned.
When, on the contrary, compression of air takes place, the compressed air, emerging through the holes in the small valve in the chamber where compression has been created, distorts the diaphragm drawing it away from the holes so permitting passage of compressed air inside the secondary cylindrical body and therefore, through the branch, distributing compressed air to the device needing it, such as a dinghy.
The geometrical form of the heads is obtained by association of the circle corresponding to the ends of the main cylinder with that corresponding to the ends of the secondary cylinder thus making said form that of a circular plate with a lateral semicircular expansion of constant width.
The piston exhibits two symmetrical discoid ends with an annular space for seal washers and, substantially central, a parallelepiped chamber of a constant rectangular section, transversal to the axis of the piston and open to the outside.
Said chamber houses a small button on a crank that freely turns on a rotor supported by the main cylindrical body substantially on its transversal axis of symmetry.
The two discoid ends of the piston are connected by an axial body whose diameter is considerably smaller than that of said ends thus permitting the rotor to fit into a part of the main cylindrical body between the chambers created on either side during the relative stages of suction.
Said rotor and crank partly emerge from the pump's main cylinder. At its rear end the crank has a cylindrical shank with diametral slits in it, communicating with the outside of the pump by an axial hole in the support of said crank.
Said crank can therefore be rotated by a means of propulsion with a coupling comprising a central cylindrical core able to penetrate inside said crank and a diametral bar whose ends can penetrate inside the slits.
Said means of propulsion can be a device with an overgear in which is an axial seat for receiving the coupling able to match with the shank of the internal crank that can be operated by a manual crank.
At the free end of said manual crank is a handgrip parallel to the axis of the overgear but rotatable around a transversal axis so as to permit the handgrip to be bent back towards the pump thus considerably lessening bulk when out of use or during transport.
The means of propulsion can be an electric ratiomotor, an ordinary electric drill, the propelling means of the boat itself.
All these means of operating must permit application of the coupling with cylindrical core and transversal bar for insertion into the shank of the internal crank acting on the piston.
There is a branch in the secondary cylindrical body for a calibrating valve that permits air to flow out automatically when a certain level of pressure is exceeded.
The diaphragms on the small valves in the secondary cylindrical body are of a size and made of a material that, if calibrated pressure is exceeded, they start to vibrate and emit a warning hiss.
Practically all the components of the pump are of plastic material, a few being of stainless steel to permit air, water and fluids generally to be pumped.
The valves of the heads are formed of a flat annular diaphragm comprising a central disk connected to the annular part by two diametral tongues.
The small valves inserted at the ends of the secondary cylindrical body are made from a cylinder in whose base is a central hole into which fits the shank of a valve with a plate lying towards the inside of said secondary cylindrical body and with a set of holes made round the central hole.
Diameter of the plate on the small valve is greater than the geomentrlc circumference externally tangential to the set of holes.
The invention offers evident advantages.
A pump is obtained by means of the head-valves that close the two ends of the main cylindrical body and the small valves at the ends of the secondary cylindrical body alongside and parallel to the main cylindrical body, said pump being exceptionally compact and of minimum bulk.
The special and extremely simple flat valves, made of silicon diaphragms that also act as packing for the heads, ensure deficient operation even though the pump is so extremely compact.
The possibility, provided by the coupling with its cross bar, of using almost any type of propulsor, from a hand-operated overgear to a ratiomotor or an ordinary electric drill or even the propulsor of a boat especially of a rubber dinghy, facilitates use of the pump accentuating its practical and rational features.
The
Fastovsky Leonid
Striker Michael J.
Walberg Teresa
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