U.S. patent number 3,680,790 [Application Number 05/127,644] was granted by the patent office on 1972-08-01 for dipper tube sprayer.
This patent grant is currently assigned to Societe Technique de Pulverisation. Invention is credited to Michel Boris.
United States Patent |
3,680,790 |
Boris |
August 1, 1972 |
DIPPER TUBE SPRAYER
Abstract
A sprayer wherein the dipper tube dipping into a liquid-carrying
container is connected with a tube ending with a spraying nozzle
through a sleeve-shaped piston controlled by the depression of last
mentioned tube. The valve closing normally the passage through the
piston is urged away by said depression of the tube against the
action of a spring and its novelty resides in the provision of a
thin peripheral lip provided in said valve and frictionally
engaging the inner surface of the chamber so as to produce
transiently a compression in said chamber when the valve is shifted
by the sliding tube, after which the compressed liquid passes past
the deformed lip towards the nozzle.
Inventors: |
Boris; Michel (Paris,
FR) |
Assignee: |
Societe Technique de
Pulverisation (Paris, FR)
|
Family
ID: |
9053006 |
Appl.
No.: |
05/127,644 |
Filed: |
March 24, 1971 |
Foreign Application Priority Data
|
|
|
|
|
Mar 26, 1970 [FR] |
|
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7011074 |
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Current U.S.
Class: |
239/353;
222/402.1; 222/402.13; 239/350; 239/354; 239/372; 222/321.2 |
Current CPC
Class: |
B05B
11/007 (20130101); B05B 11/3023 (20130101) |
Current International
Class: |
B05B
11/00 (20060101); B05b 007/30 () |
Field of
Search: |
;239/337,350,354,372,573,579,353 ;222/402.1,402.13 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wood, Jr.; M. Henson
Assistant Examiner: Grant; Edwin D.
Claims
What I claim is:
1. In a sprayer including a compression chamber, a dipper tube
forming an extension of said chamber, a sleeve-shaped piston
slidingly fitted in said chamber and provided with an annular seat
facing the chamber, a tube slidingly adapted to engage the end of
the piston opposed to the seat to urge said piston towards the
dipper tube, a spraying nozzle at the end of the tube opposed to
the piston and hand-operable means adapted to urge the tube
downwardly into engagement with the piston, the combination of a
flap valve adapted to engage the seat on the piston to close the
passage through the latter and to be urged away from said seat by
the sliding tube before the latter engages the piston end, said
valve being provided with a thin peripheral lip frictionally
engaging the inner surface of the chamber and elastic means fitted
inside the chamber and urging the flap valve against its seat
thereby to shift the piston away from the dipper tube.
Description
Dipper tube sprayers are known, which include a pumping chamber
connected with the dipper tube, a sleeve-shaped delivering piston
slidingly fitted inside said chamber, a tube axially slidable
inside the sleeve-shaped piston and opening into a spraying nozzle,
a flap valve at the end of said tube opposed to the nozzle and
adapted to engage a seat formed in the sleeve-shaped piston facing
the chamber, means urging elastically the flap valve against said
seat and consequently causing the sleeve-shaped piston to slide
inside the pumping chamber towards the end of the latter facing
away from the dipper tube and hand-operable means shifting the
sliding tube in antagonism with said elastic means to shift with a
lost motion the sleeve-shaped delivering piston.
When such a sprayer is to be used, the sliding tube is urged
downwardly in antagonism with the elastic means; the flap valve
moves first off its seat so as to connect the pumping chamber with
the nozzle, following which the sleeve-shaped piston is carried
along in its turn so that the liquid within the chamber is
propelled towards the nozzle and is sprayed by the latter.
If the sliding tube is depressed slowly, the delivering pressure is
very low at the start and the liquid is not correctly atomized and
it may sometimes pass out of the nozzle as a solid non-atomized
jet.
The present invention has for its object improvements in atomizers
of the above referred to type with a view to cutting out its
drawback.
According to said invention, the flap valve is provided with a thin
peripheral lip engaging the wall of the pumping chamber after the
manner of a piston.
Thus, when the sliding tube begins moving, no liquid can pass as
yet immediately into the atomizing or pumping chamber and is first
subjected to a preliminary compression by the flap valve and its
thin peripheral lip. Subsequently, when the pressure has reached a
predetermined value, the thin lip is deformed by said pressure and
allows the liquid to pass beyond it and to reach the nozzle under a
pressure which ensures its proper atomization.
There is described hereinafter by way of example and in a
non-limited sense an embodiment of a dipper tube atomizer according
to the present invention, reference being made to the single figure
of the accompanying drawing showing said atomizer in axial
cross-sectional view.
As illustrated, the atomizer includes a cylindrical body 1 adapted
to be secured to a container 2 carrying the liquid to be atomized
and to form a stopper for said container; to this end the body 1,
made of plastics for instance, is tapped so as to be screwed over
the neck of the container 2. An outer sleeve 3 is fitted with a
force fit over the body 1.
Inside the body 1, there is provided a pumping chamber within an
annular wall 4 the upper end of which carries an outer flange 4a
held fast within a shoulder 1a closing partly the upper end of the
body 1. The pumping chamber extends at its lower end so as to
register with the dipper tube 5 which latter is closed at its upper
end by a non-return ball valve 6.
Inside the pumping chamber 4, a sleeve-shaped piston 7 is slidingly
fitted and, inside said piston 7, is again slidingly fitted a tube
8 the lower end of which abuts against the upper tail-end 9a of a
flap valve 9. A spring 10 fitted between the flap valve and the
lower end of the pumping chamber urges said flap valve against its
annular seat 11 provided at the lower end of the sleeve-shaped
piston 7; the tail end 9a of the flap valve engages then the bore
in said sleeve-shaped piston. A clearance 12 is provided within the
inner surface of the latter facing said tail end 9a and the lower
end of the tube 8 which latter shows also a radial bore 13.
The upper end of this tube 8 is secured to a pusher member 14 and
opens into an atomizing nozzle 15 extending through the side wall
of said pusher member.
The sliding tube is provided at a point of its length with an
annular shoulder 8a located, when the sprayer is inoperative, a
short distance above the sleeve-shaped piston 7. The outer diameter
of said annular shoulder is smaller than the inner diameter of a
socket 16 fitted in the upper opening of the pumping chamber 4 and
provided with an outer flange 16a clamped between the upper
shoulder 1a of the body 1 and the outer flange 4a of the chamber
wall.
The sleeve-shaped piston 7 is provided with an outer frustoconical
surface 7a which engages, when the sprayer is inoperative, the
lower edge of the socket 16.
According to the present invention, the flap valve 9 includes a
thin peripheral lip 9b acting as a piston inside the pumping
chamber 4 and the concavity of which faces the piston 7 in the case
illustrated.
The drawing shows the sprayer in its inoperative condition for
which the spring 10 holds the flap valve 9 on its seat 11 and also
holds the frustoconical surface 7a of the sleeve 7 in contact with
the edge of the socket 16 whereby the opening 17 connecting the
chamber 4 through the upper end of the container 2 with the upper
end of the chamber 4 through the wall of the latter is cut off. The
pumping chamber 4 and the inside of the container are thus closed
with reference to the external atmosphere above the piston 7 and no
leak can be observed.
When the operator depresses the pusher member 14, the flap valve 9
moves off its seat but the sleeve-shaped piston 7 remains
transiently in the position illustrated by reason of the friction
between it and the wall of the chamber 4. These conditions prevail
until the shoulder 8a on the tube 8 impinges against the piston.
From this moment onwards and as the operator continues depressing
the pusher member 14, the piston 7 moves in unison with the tube 8,
so that the liquid carried inside the chamber 4 is urged into the
spraying tube 8 through the clearance 12 and the radial bore 13,
the liquid being finally atomized through the nozzle 15.
Furthermore, the opening 17 which is now uncovered connects the
upper end of the container 2 with the atmosphere alongside the tube
8, which prevents said container from being subjected to a reduced
pressure.
When the flap valve 9 begins sinking inside the chamber 4, its
peripheral lip 9b first compresses the liquid inside said chamber,
after which it is deformed by the liquid under pressure, so that it
allows then the liquid to flow past it in a compressed condition
towards the nozzle 15.
When the operator releases the pusher member, the flap valve 10
rises and engages its seat 1 which cuts the chamber 4 off the bore
in the tube 8 and the atmosphere. At the same time, the piston 7
rises and reduces the pressure in the chamber 4. This leads to a
rise of the liquid out of the container 2 through the dipper tube
5. The frustoconical surface 7a of the sleeve 7 impinges then
against the lower edge of the socket 16 and closes thus the opening
17 while the piston 7 and the tube 8 stop in the position then
reached by them. The different parts of the sprayer have thus
returned into their inoperative starting position as
illustrated.
* * * * *