Fluid handling – Inflatable article – With gauge or indicator
Patent
1998-04-23
1999-03-09
Rivell, John
Fluid handling
Inflatable article
With gauge or indicator
137229, 731468, F16K 1116, B60S 504
Patent
active
058787747
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a tire inflation gun.
Tire inflation guns are known in the art. They generally comprise a gun structure connected by a pipe to a compressed air receiver and extend into a tube provided with an element for its connection to a tire nozzle. A pressure gauge is connected to the gun structure for checking the tire pressure.
The inflation gun is used by connecting the gun to the tire, the pressure gauge then indicating the tire pressure. If the internal pressure is less than the correct value, the user operates the gun trigger to connect the compressed air receiver to the tire and hence inflate it. If the internal pressure is too high, the user causes air to escape from the tire by again operating the trigger, but moving it only a short distance.
However, this known inflation gun has the drawback that, during inflation, the pressure gauge is connected to the compressed air receiver, with consequent damage to the sensor element and to the pointer of the pressure gauge graduated scale, which has an end-of-scale value which is distinctly less than the pressure in the receiver.
An object of the invention is to eliminate this drawback by providing an inflation gun which, during tire inflation, closes the connection between the pressure gauge and the compressed air receiver.
It is another object of the invention to provide a tire inflation gun allowing a tire to be inflated or deflated and measure the pressure within the tire. It is another object of the invention to provide a valve that may be used in a tire inflation device that allows the tire to be deflated while measuring the pressure in the tire but protects the pressure gauge from exposure to high pressure during tire inflation.
SUMMARY OF THE INVENTION
The tire inflation gun has three chambers; one communicates with the pressurized air supply, a second leads to a tube that can be connected to a tire and the third communicates with the pressure gauge. A valve separates the first chamber from the second and third. The valve has a first valve body in a valve seat and a second valve body within a through-bore of the first valve body. A trigger engages the head of the second valve body to move it axially. When moved a small distance, air is allowed to flow from the second chamber into the through-bore and passed the second valve body to the atmosphere. When the trigger is fully depressed, the second valve body head engages the first valve body thereby sealing the through-bore and raising the first valve body. As this occurs, the first chamber is in fluid communication with the second chamber but the third chamber is sealed from the pressurized air supply.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the invention is described in detail hereinafter by way of non-limiting embodiment with reference to the accompanying drawings, in which:
FIG. 1 is a longitudinal section through a gun according to the invention;
FIG. 2 is an enlarged detailed view of the operating valve when checking the tire pressure;
FIG. 3 shows the operating valve in the same view as FIG. 3 during tire inflation; and
FIG. 4 shows the operating valve during deflation.
DETAILED DESCRIPTION OF THE INVENTION
As can be seen from the figures, the inflation gun according to the invention, comprises a gun structure 2 provided with a threaded insert 4 for connection to the pipe 5 of the compressed air receiver and a tube 6 provided with an element 8 for connection to the tire nozzle. A pressure gauge 10 is also mounted on the gun structure.
Within the gun structure, there is provided a cylindrical seat 12 for a valving element indicating overall by 14. The cylindrical seat 12 for the valving element 14 comprises a first aperture 16 provided at one end facing a trigger 18 hinged to the gun structure. In a substantially central position in the seat, there is a second aperture 20 which connects the seat to a chamber 22 connected to the compressed air pipe 5. The seat comprises a third aperture 24 for connecting the seat to a chamber
REFERENCES:
patent: 229023 (1880-01-01), Amneus
patent: 1420997 (1922-06-01), Freeman
patent: 1495679 (1924-05-01), Donaldson
patent: 1666283 (1928-04-01), Farley
patent: 1781121 (1930-11-01), Mc Farland
patent: 1834033 (1931-12-01), Michelin
patent: 1933610 (1933-11-01), Wahl
patent: 1981586 (1934-11-01), Crowley
patent: 2001233 (1935-05-01), Anderberg
patent: 2039638 (1936-05-01), Druge et al.
patent: 2173619 (1939-09-01), Ames
patent: 2296622 (1942-09-01), Wehe
patent: 2635623 (1953-04-01), Moffett
patent: 4116245 (1978-09-01), Ayers
patent: 4424831 (1984-01-01), Nugent
patent: 4658869 (1987-04-01), Soon-Fu
Rivell John
Schoenfeld Meredith H.
Walmec S.p.A.
LandOfFree
Tyre inflation gun does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tyre inflation gun, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tyre inflation gun will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1311850