Dispensing – Fluid flow discharge
Patent
1995-11-13
1997-11-18
Huson, Gregory L.
Dispensing
Fluid flow discharge
222325, 239145, B05B 700
Patent
active
056878869
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to apparatus for dispensing a fine spray of liquid particles and more especially, but not exclusively to liquid dispensers known as air brushes.
My co-pending British patent applications Nos: 9013745.6 and 9225350.9 disclose apparatus for dispensing a fine spray of liquid particles which comprises a hand or foot operated pump connected to supply air under pressure directly to a nozzle so positioned that air leaving a nozzle is directed onto and over a nib of a pen-like container releasably supported within a holder with the nib of the container in close proximity to the nozzle outlet to cause liquid from the nib to be dispensed as a fine particulate spray in air. Typically the pen-like container is a felt tipped pen.
The present invention sets out to provide a simplified and less costly dispenser which removes the need for a pump but which produces the required fine spray from an absorbent nib of a reservoir pen.
An airbrush for use with a reservoir pen with a nib of absorbent material is disclosed in published British Patent Application 2257058. The reservoir pen disclosed in this application is of special design and includes an end cap formed with a hole to equalise the pressure within the pen reservoir to avoid the presence of a vacuum. Apparatus in accordance with the present invention does not require the presence of such an end cap and can operate effectively using conventional reservoir pens, eg felt-tipped pens. Also, the reservoir pen of GB-A-2257058 is positioned with its nib within the converging portion of the outlet nozzle of the airbrush. Applicant has established that, for best results, it is essential to position the absorbent nib so that it at least partially enters the outlet orifice of the nozzle. One advantage of the present invention is that the dispensing apparatus is constructed to ensure that the reservoir pen is correctly positioned.
JP-A-61042352 discloses an air brush in which high pressure air from a source connected to the air brush by a conduit and controlled by a valve enters a cylinder in which a felt tipped pen is located. An important advantage of the present invention is that the need for an expensive independent source of high pressure air is removed.
SUMMARY OF THE INVENTION
According to the present invention in one aspect there is provided apparatus for dispensing a fine spray of liquid particles which comprises a hollow tubular housing and a reservoir pen formed with a nib of absorbent material retained within and spaced from the inner wall of the housing, the tubular housing including at one end a nozzle whose interior defines a converging path and means for locating the pen within the housing with its absorbent nib at least partially within the boundary of the outlet orifice of the nozzle, the apparatus being characterised in that it has at its end remote from the nozzle a mouth piece through which air can be blown through the tubular housing and over the pen to the outlet orifice of the nozzle.
The nozzle and/or mouthpiece may be releasably secured to the tubular housing and the position of one, or both, may be varied to accommodate pens of different length. Alternatively, the nozzle and/or mouthpiece may be formed integrally with the housing, the pen being either removable from or permanently retained within the housing.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be described by way of example only with reference to the accompanying diagrammatic drawings in which:
FIG. 1 is a side view of dispensing apparatus in accordance with the invention;
FIGS. 2 and 3 are end views of the apparatus illustrated in FIG. 1 in the directions of arrows "A" and "B" respectively;
FIG. 4 is a side view in section of the apparatus illustrated in FIGS. 1 to 3 taken along line III--III of FIG. 2;
FIG. 5 is a side view of a barrel of the apparatus illustrated in FIGS. 1 and 4;
FIGS. 6 and 7 are end views of the barrel illustrated in FIG. 5 taken in the directions "C" and "D" respectively; and
FIG. 8 is a side view in
REFERENCES:
patent: 4446990 (1984-05-01), Stevenson et al.
patent: 5156684 (1992-10-01), Mayer et al.
patent: 5190220 (1993-03-01), Bolton
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