Dispensing – Movable material discharge guide – Foldable – bendable – collapsible or flexible
Reexamination Certificate
1999-11-16
2001-09-04
Shaver, Kevin (Department: 3754)
Dispensing
Movable material discharge guide
Foldable, bendable, collapsible or flexible
C222S538000
Reexamination Certificate
active
06283340
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to nozzles for air hoses and particularly to a nozzle that has an adjustable telescoping end.
PRIOR ART AND INFORMATION DISCLOSURE
Air hoses discharging compressed air are used in many applications where a jet stream of air is the most effective way of blowing dust from a surface, drying, and particularly for dislodging debris lodged in cracks and crannies.
A typical “shop air hose” according to prior art includes a gun housing a conduit with an inlet port having a female thread on one end that is screwable onto a hose carrying forced air. An outlet port with a female thread is on the other end A button loaded by a spring on the central section of the body is depressed to open an internal valve permitting a blast of air to pass into the entry port, through the conduit and out of the exit port. An exit tube (shown detached) is screwed into the outlet port whose length depends on the circumstance of use.
In one circumstance, where it is desired to provide an air stream covering a wide area, the exit tube is very short. In another circumstance, where it is required to deliver a liquid (water) spray, the tube has a medium length(e.g., four inches and a side tube has one end connected perpendicularly to near the end of the exit tube and another end connected to a hose that dips into a container or source of the liquid so that the stream of air siphons the liquid out of the container.
In another application, where it is desired to direct a narrow air stream into otherwise inaccessible regions, the air stream is most effectively directed by attaching a long tube onto the outlet port.
In some work places, a combination of circumstances occur that require exchanges of tube having various lengths. In this case, it is necessary to have available a number of tubes and the user must suffer the inconvenience of having to frequently detach (unscrew) one tube from the body and attach a tube having a different length.
Various nozzle constructions for special applications have been disclosed in the prior art.
For example, U.S. Pat. No. 4,817,832 to Nagy discloses a nozzle assembly adapted for being secured on a container which comprises a helically formed member having one end secured to the container and another end extendable from the container by stretching the helix. This is not a practical construction for:“blowing out” debris from the cracks and crannies in accordance with the objects of the invention.
U.S. Pat. No. 5,595,461 to Miller discloses a density controller for conveying an air stream carrying particles wherein the nozzle is fitted onto a vacuum generator. This construction is not conveniently constructed for the purposes of this invention.
U.S. Pat. No. 5,706,983 discloses a trigger sprayer having a nozzle cover that telescopes onto the discharge orifice.
None of.
SUMMARY OF THE INVENTION
It is an object of this invention to provide an air gun with a nozzle that is useful in all circumstances requiring adjusting the length of the nozzle to a length that is adaptable to any one of various circumstances.
It is another object that the length-adjustable nozzle of this invention be constructed to prevent sudden inadvertent extension of the nozzle that might occur if the open end of the nozzle is suddenly (and accidentally) stopped up causing air pressure to increase inside the nozzle. Such accidental and sudden lengthening of the nozzle may cause damage and or injury to the user especially if he is “blowing off moving machinery such as an engine lathe.
This invention is directed toward an air gun having a telescoping nozzle of two or more sections. The overall length of the nozzle is variable by slidably positioning each section axially with respect to one another. The first section (opposite the open end of the nozzle) is secured to an “anchor” section that is secured to and communicates with the gun housing.
In one embodiment, the anchor section comprises an outer sleeve telescoped over an inner sleeve.
The inner sleeve encloses a cylindrical plug having a central bore extending from an entry opening to an exit opening through which air passes in normal use. Additionally there are one or more “planet” bores, parallel to the central bore extending from the exit end of the plug to a cavity between the plug and inner surface of the inner sleeve. The cavity is formed by a section of the plug between ends of the plug having a reduced diameter. Each sleeve has an aperture and when the apertures are aligned, excess pressurized air can pass back from the exit end of the plug, through the planet bores, into the cavity then out through the passageway formed by the apertures in the inner and outer sleeves. The outer sleeve can be positioned so as to vary the degree of misalignment of the sleeves and thereby vary the size of the passageway through the sleeve walls formed by the two apertures. When the apertures are aligned with one another and if the open end of the nozzle is inadvertently and suddenly closed, then the air otherwise passing through the nozzle passes out through the passageway so that air pressure in the nozzle does not increase and the nozzle does not suddenly lengthen.
In the construction just described, there will always be leakage of air from inside the inner sleeve through the unless the apertures are completely misaligned so that there is no opening from inside the sleeves to outside the sleeves. It is an embodiment of this invention that the rate of leakage and the force of air through the nozzle can be adjusted by adjusting the size of the passage. This is done by positioning the outside sleeve to establish a required passage size.
Two constructions are contemplated for adjusting the passageway size.
In one construction, the outer sleeve is axially positionable on the inner sleeve and in retracted position of the outer sleeve, the passageway is completely closed so that there is no air leakage through the passageway. When the open end of the nozzle is closed, the air pressure in the nozzle builds to a critical pressure above which the outer sleeve slides axially to a second position where the passage is open. The air escapes through the passage before the nozzle is able to extend. Critical pressure is selected by a collar having an adjustable diameter slipped over the outer sleeve. The tightness of the collar is adjusted to where resistance to sliding of the outer sleeve over the inner sleeve equals the force exerted by the critical pressure selected to extend the nozzle.
In a second construction, the outer sleeve is rotationally positionable on the inner sleeve. Degree of alignment of the apertures (size of the passageway is selected by appropriate rotation of the outer sleeve on the inner sleeve.
In yet another embodiment, the outer sleeve is positioned inside a porous tube such as fabric. The air escaping through the passageway is diffused in passing through tube thereby avoiding any problems accruing from a directed escaping stream of air that would otherwise occur without the tube.
REFERENCES:
patent: 3938218 (1976-02-01), DeAmicis
patent: 4817832 (1989-04-01), Nagy
patent: 4886212 (1989-12-01), Proctor et al.
patent: 5054160 (1991-10-01), Marino
patent: 5540359 (1996-07-01), Gobbel
patent: 5566858 (1996-10-01), Ducker, III
patent: 5595461 (1997-01-01), Miller
patent: 5944911 (1999-08-01), Winters et al.
patent: 5966847 (1999-10-01), Nathenson et al.
Deal David
Shaver Kevin
Smith Robert Samuel
LandOfFree
Telescopic nozzle for an air gun with safe pressure release does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Telescopic nozzle for an air gun with safe pressure release, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Telescopic nozzle for an air gun with safe pressure release will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2479225