U.S. patent number 3,881,265 [Application Number 05/363,965] was granted by the patent office on 1975-05-06 for steam-spray iron.
This patent grant is currently assigned to SCM Corporation. Invention is credited to John L. Eaton, Roger V. Eeckhout, John C. Fagan.
United States Patent |
3,881,265 |
Eaton , et al. |
May 6, 1975 |
Steam-spray iron
Abstract
An electric steam-spray iron having a pump and a bi-stable valve
in a single housing for drawing water from a reservoir and
delivering it to either a spray nozzle or a steam generating
chamber which communicates with steam ports in the sole plate. The
valve's stable state is changed by rocking movement of the pump's
piston.
Inventors: |
Eaton; John L. (Delanco,
NJ), Fagan; John C. (Philadelphia, PA), Eeckhout; Roger
V. (Warminster, PA) |
Assignee: |
SCM Corporation (New York,
NY)
|
Family
ID: |
23432471 |
Appl.
No.: |
05/363,965 |
Filed: |
May 25, 1973 |
Current U.S.
Class: |
38/77.5;
137/625.42 |
Current CPC
Class: |
D06F
75/18 (20130101); D06F 75/22 (20130101); F04B
53/14 (20130101); F04B 7/00 (20130101); B05B
11/00 (20130101); B05B 11/3015 (20130101); Y10T
137/86831 (20150401) |
Current International
Class: |
B05B
11/00 (20060101); D06F 75/18 (20060101); F04B
53/14 (20060101); F04B 7/00 (20060101); D06F
75/22 (20060101); F04B 53/00 (20060101); D06F
75/08 (20060101); D06f 075/06 () |
Field of
Search: |
;38/77.5,77.8,77.83,77.9 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Lawson; Patrick D.
Attorney, Agent or Firm: Fidelman, Wolffe & Leitner
Claims
What is claimed is:
1. In an electrical pressing iron having a sole plate with steam
ports, a steam generating chamber communicating with said steam
ports, a spray nozzle, a valve means with two outlets, one
communicating with said spray nozzle and the other with said steam
generating chamber, a reservoir, a pump having piston means, said
pump having an inlet communicating with said reservoir and an
outlet communicating with said valve, the improvement
comprising:
said valve means being bistable for allowing only one of said two
outlets to be open at a time, and
pump actuation means for operating said pump and for selecting said
one of said valve's stable states.
2. In an electrical pressing iron having a sole plate with steam
ports, a steam generating chamber communicating with said steam
ports, a spray nozzle, a valve means with two outlets, one
communicating with said spray nozzle and the other with said steam
generating chamber, a reservoir, a pump comprising a housing and an
inlet communicating with said reservoir and an outlet communicating
with said valve, the improvement comprising:
said valve means being bistable for allowing only one of said two
outlets to be open at a time, and
pump actuation means for operating said pump and for selecting said
one of said valve's stable states, said pump actuation means
comprises a piston having a first end within said pump housing, and
an actuator member having a first end telescopically received by
said piston's first end and a second end received by said valve
means.
3. The iron as in claim 2 wherein said pump actuation means
includes a biasing means between said piston and said actuator for
urging separation of said piston and said actuator.
4. In an electrical pressing iron having a sole plate with steam
ports, a setam generating chamber communicating with said steam
ports, a spray nozzle, a valve means with two outlets, one
communicating with said spray nozzle and the other with said steam
generating chamber, a reservoir, a pump with an inlet communicating
with said reservoir and an outlet communicating with said valve,
the improvement comprising:
said valve means being bistable for allowing only one of said two
outlets to be open at a time, said valve means comprising a valve
housing with both of said outlets being inside the bottom of said
valve housing, rocker means positioned in said valve housing above
said valve outlets for assuming one of two stable positions;
and
pump actuation means for operating said pump and for selecting one
of said valve's stable states.
5. The iron of claim 4 wherein said rocker means comprises a body,
two valve closing means on opposite ends of a first side of said
body, and a fulcrum between said valve closing means extending down
from said body's first side.
6. The iron of claim 5 wherein said rocker means includes a cam
surface on a second side of said body opposite said first side for
receiving an end of said pump actuation means for selecting said
rocker means' stable position.
7. The iron of claim 6 wherein said cam surface has an angular
cross-section and said valve closing means comprise
protruberances.
8. The iron of claim 4 wherein said pump actuation means comprises
a body and an actuator having a first end telescopically engaging
said pump actuation means' body and a second end engaging said
rocker means.
9. The iron of claim 8 wherein said rocker means includes an
angular cam surface for engaging said actuator's second end.
10. The iron of claim 9 wherein said actuator's second end is
substantially conical and said pump actuation means includes a
biasing means between said actuator and said pump actuation means
body for causing said actuator's conical end to rest on one side of
said rocker means angular cam surface or the other.
11. In an electrical steam-spray iron having a sole plate with
steam ports, a steam generating chamber communicating with said
steam ports, a spray nozzle, a reservoir, a piston pump whose inlet
communicates with said reservoir and an outlet, a valve means whose
inlet communicates with said pump's outlet and whose outlets
communicate with said spray nozzle and said steam generating
chamber, the improvement comprising:
said valve means and said pump having a common housing with one
inlet communicating with said reservoir and two outlets
communicating with said spray nozzle and said steam generating
chamber, respectively,
said valve having a bi-stable controller, and
said piston having an actuator means engaging said controller for
changing said controller's stable states in response to lateral
movement of said piston.
12. A steam-spray iron as in claim 11 wherein said controller
includes a fulcrum means adapted to engage the bottom interior of
said housing for producing said bi-stable action.
13. A steam-spray iron as in claim 12 wherein actuator means
includes a biasing means for maintaining said actuator means in
contact with said controller and for maintaining said controller in
a selected stable state after said piston's lateral movement.
14. A steam-spray iron as in claim 13 wherein said controller and
said actuating means each have convex cooperating angular surfaces
at the surface of engagement for insuring bi-stable action.
15. A steam-spray iron as in claim 14 wherein said controller is
disposed in a slot in said housing's bottom, and said two outlets
also are in said slot.
16. A steam-spray iron as in claim 15 wherein said actuating mean's
convex surface is disposed in said slot and said inlet is external
to said slot.
17. A steam-spray iron as in claim 11 including a tube connecting
said housing inlet and said reservoir, a filtering means in said
reservoir and encompassing an end of said tube.
18. A steam-spray iron as in claim 17 wherein said filtering means
includes a spiral wire encompassing an end of said tube.
19. A steam-spray iron as in claim 18 wherein said filtering means
includes a port whose axis is perpendicular to the axis of said
tube and said port being encompassed by said spiral wire.
20. A steam-spray iron as in claim 18 wherein said spiral of said
wire is tapered at one end.
21. A steam-spray iron as in claim 11 including a check valve
between said outlet and said steam generating chamber comprising a
diaphragm with a slit therein.
22. A steam-spray iron as in claim 21 wherein said check valve
includes a channel on one side of said diaphragm which is of
greater diameter than a channel on the outer side of said
diaphragm.
23. A steam-spray iron as in claim 11 including a check valve in
said spray nozzle comprising an elastic cup means encompassing an
end of a tube for maintaining a seal for pressure in one direction
and for deforming to allow flow for pressure in an opposite
direction.
Description
BACKGROUND OF THE INVENTION
The present invention relates generally to the electric iron art
and more specifically to the combination steam and spray electrical
irons.
DESCRIPTION OF THE PRIOR ART
In the field of electric irons, there have been many devices
combined in the housing of the electrical iron to provide moisture
to the item to be ironed. These devices have included a nozzle to
spray water droplets onto the object to be ironed in the path of
the iron. Also many irons have provided a needle valve which allows
small droplets of water to enter a steam generating chamber to
provide a continuous steam through steam ports in the sole plate of
the iron. Along with the water spray and the continuous steam,
irons have been developed which include a deep penetrating steam
produced by introduction of a large amount of water into a steam
generating chamber to produce a high velocity steam for the removal
of stubborn wrinkles or for deep penetration of thick fabrics.
The moisture producing electric irons fall within two basic
categories, i.e., steam pressure-type and the manual pump-type. In
the steam pressure-type, some of the normal steam is diverted by a
valve up to the spray nozzle and this steam flow aspirates water
from the tank so that a spray of water and steam emerges from the
nozzle.
The second type of moisture producing iron, namely the manual pump
type, has become more popular in the marketplace and is the subject
of the present invention. In this type of iron, water which is
withdrawn from a reservoir by a manual piston pump is delivered to
either a spray nozzle or to a steam generating chamber which
communicates with the steam outlets in the sole plate. The manual
pump irons of the prior art (for example, U.S. Pat. Nos. 3,599,357
and 3,691,660) have involved rotation of a member to operate
multiple valves or to relocate a sliding sleeve port.
In utilizing the iron of the prior art, one must either hold the
iron with one hand and make the selection of mode of moisture
delivery with the other hand, or else must place the iron in its
rest position and make this selection. Thus, in order to make a
moisture mode selection, the user must interrupt her normal ironing
process. This interruption for selecting the state of the moisture
to be delivered is annoying and time consuming.
Objects and Summary of the Invention
Thus it is a primary object of the present invention to provide a
pump and moisture selection means in a single housing with a
reduced number of parts.
Another object of the invention is to increase reliability by
reduction of the number of parts.
A further object of the invention is to provide a steam-spray iron
which is easy to use and uncomplicated to the normal user.
Still another object of the present invention is to provide an
improved electrical steam-spray iron having a combined pump and
valve mechanism wherein rocking movement of the piston selects the
path of discharge, either to the spray mechanism or into the steam
generating chamber.
An even further object of the invention is to provide steam-spray
iron which has a bi-stable valve mechanism operable without
interruption of the ironing process.
The objectives outlined above, as well as other objects and
features of the present invention, are accomplished by an improved
steam-spray iron wherein a bi-stable valve and a manual piston pump
share a common housing whereby movement of the pump handle provides
a selection of the bi-stable valve's stable state and also provides
the manual pump action. The bi-stable valve determines whether the
water drawn from the reservoir by the pump is distributed to the
spray nozzle or down into a steam generating chamber to produce a
high velocity steam through steam ports in the sole plate. Rocking
movement of the manual pump handle is transmitted to a valve rocker
by a spring biased actuator telescopically received within the face
of the piston. The valve rocker sits in the base of the combined
pump and valve housing and has a center fulcrum which causes the
rocker to have only two stable positions. The outlets in the base
of the combined housing directs the water either to the spray
nozzle or into the steam generating chamber to produce high
velocity steam. The lateral selection movement of the pump handle
may be made by the user with a single finger, preferably the same
finger which operates the pump, and may be made without
interruption of the ironing process.
Brief Description of the Drawings
FIG. 1 is a diagrammatic view showing the manner in which the steam
spray device of the invention is mounted within the body of an
electric iron;
FIG. 2 is a sectional view of parts broken away, showing on a
larger scale the combined pump valve housing communicating with the
spray and steam producing devices;
FIGS. 3a and 3b are perspective and sectional views, respectively,
of the combined pump and valve housing base;
FIGS. 4a and 4b are perspective and side views, respectively, of
the valve rocker;
FIG. 5 is a sectional view of the combined check valve and water
filter;
FIG. 6 is a sectional cut-away view showing the pump handle in the
down position and the bi-stable valve in the second stable
state.
Description of Preferred Embodiments
Referring to FIG. 1, an electrical steam-spray iron 10 is shown
incorporating the combination pump and valve mechanism of the
present invention. The iron 10 includes a sole plate 11 having a
plurality of steam ports (not shown) therein. Supported above the
sole plate 11 is case 13 and handle 14. A continuous steam switch
15 is shown in the top part of the casing 13 which is used to
control a needle valve (not shown) which provides a small gravity
flow of water from the reservoir into a steam generating chamber to
produce a continuous steam through the steam ports. The assembly to
produce this constant steam has been eliminated from the drawings
in order to avoid confusion with the present invention.
The front of the housing having a temperature selection switch 16
which controls a thermostatically controlled switch in the body,
also is not shown. Conduit 17 provides a means for inserting water
through the face of the iron down into reservoir 18.
The combined pump or valve housing 19 contained within the handle
has a button 20 which is used to manually activate the pump and to
select the position of the bi-stable valve. A tube or pipe 21
connects the reservoir 18 with the inlet to the combined pump valve
housing 19. The two outlets for the pump and valve housing 19 are
connected to a steam generating chamber by tube 22 and to spray
nozzle 24 by tube 23. At the end of tube 21 which rests within
reservoir 18, a combined filter and check valve 25 is provided.
Also, on the end of tube 22 connecting the combined pump and valve
housing 19 with the steam generating chamber, a unique check valve
26, discussed in more detail later, is used. It should be noted
that spray nozzle 24 also has a unique check valve enclosed therein
which will also be discussed later.
Iron 10 in FIG. 1 operates in four basic modes. The first mode is a
dry mode wherein switch 15 is switched to the dry position which
closes a needle valve to prevent water dripping into a steam
generating chamber. The second mode is a steady, continuous steam
produced by moving switch 15 to the steam mode and allowing water
to drip one drop at a time into a steam generating chamber. The
third and fourth modes are selected by pump button 20 through the
operation of combined pump and valve housing 19. The third mode is
the production of water from spray nozzle 24 selected by lateral or
rocking movement of pump button 20. Once the button has been moved
left, as viewed in FIG. 1 to move the bi-stable valve to a first
stable position, upward movement of the pump button draws water
from reservoir 18 through filter 25 to tube 21 into the housing 19
and downward movement forces the water out of the housing through
tube 23 to spray nozzle 24. The fourth mode of operation produces a
high velocity steam in which button 20 is rocked in the opposite
direction to move the bi-stable valve to a second stable position
so as to allow water to be withdrawn from reservoir 18 through
filter 25, tube 21, and into valve housing 19 by an upward movement
and then to be delivered through tube 22 and check valve 26 into a
steam generating chamber by a downward movement. It is apparent
from FIG. 1 that the selection of the third or fourth mode may be
made by the user's thumb, which may be the same finger used for the
up-down pump action. Both of these motions of the thumb are made
simultaneously with the use of the iron and without interruption of
the ironing process.
A more detailed explanation of the workings and contents of the
combination pump and valve mechanism in relationship to the spray
nozzle, the reservoir and the steam generating chamber will be
described with reference to FIGS. 2-4. The pump button 20 is shown
as having an inverted U-shaped section with a center member 28. The
center member 28 has a bore 27 for receiving piston rod 33 of
piston 32 therein. Secured to the top of pump button 20 may be a
metal plate 29 which exhibits indicia for aiding the user in
selecting spray or high velocity steam modes.
The combined pump and valve housing 19 is composed of two members,
i.e., pump housing 30 and pump base 40. The two pieces are press
fitted together to provide a tight seal therebetween. The housing
30 has an aperture 31 in the top thereof for receiving piston rod
33 and for permitting the rocking motion of the piston rod. Piston
32 is preferably formed of a single piece of material having a
piston rod 33 and a head 34. The head 34 has a circumferential
recess in which rests O-ring or any other sealing medium 35 which
provides a seal between the piston head 34 and the pump housing 30.
The O-ring may be coated with a lubricant to facilitate the
movement of the piston within the pump housing.
In the face of the piston head 34, an aperture 36, which continues
into the piston rod 33, receives the actuator 37 therein. The
diameter of the actuator 37 is smaller than the diameter of the
aperture 36 such that the actuator 37 is telescopically received
within the piston 32 and moves freely therein. The actuator 37 is
shown as having a modified conical head 38 with sides cooperating
to form angular surfaces having a partially rounded tip.
It is the shape of actuator head 38 which forms an important
camming surface to be used in combination with valve rocker 70 to
provide the bi-stable operation of the valve to be explained
hereafter. Spring 39 between the face of piston head 34 and the
base of actuator conical head 38 provides a biasing means which
urges the separation of the actuator 37 from the piston 32. It
should be obvious that the biasing means 39 may also be placed in
aperture 36. Besides keeping the actuator 37 in contact with valve
rocker 70, biasing means 39 also produces the upward or return
movement of the pump button 20. As mentioned previously, the
aperture or bore 36 in the piston 32 is deep enough so as to allow
the piston to travel its full stroke while telescopically receiving
the valve actuator 37 as shown in FIG. 6.
In the internal bottom of pump base 40 lies tapered valve seats 41
and 42, the openings of which communicate with external outlets 43
and 44, respectively. Inserted into outlet 43 is tube 23 leading to
the spray nozzle 24 and in outlet 44 is inserted tube 22 leading to
the steam generation chamber. Internal to pump housing 30 is inlet
45 communicating with an external inlet 46 having tube 21 inserted
therein which communicates with the reservoir 18. As the pump moves
up, water is drawn from the reservoir through tube 21, inlets 46
and 45 into the combined pump and valve housing 19. On the
downstroke, the water in the housing is forced through one of the
openings of valve seats 41 or 42 and into its respective tubes 23
or 22. The outlet through which the water exits the pump base 40 is
determined by the position of bi-stable rocket 70. As shown in FIG.
2, the water will exit out of opening 42, outlet 44, and down into
tube 22 to the steam generation chamber.
An examination of FIGS. 3a and 3b will reveal the precise
relationship of the inlet, outlets, and openings and tapered valve
seats of the pump base 40. The pump base 40 has an internal
structure or member 47 having a slot or recess 48 therein. The
valve seats 41 and 42 are in the bottom of said slot or recess and
the inlet 46 communicates with the internal inlet 45 at the top of
internal member 47. The slot or recess 48 provides a seat for
rocker 70 and also provides a stop for actuator head 38, thereby
limiting the movement of the combination actuator and thus the
piston to lateral movement within the slot or recess 48. The recess
does not interfere or in any way limit the vertical pumping
action.
The spray nozzle 24, as shown in FIG. 2, comprises a base or body
50 which threadably receives nozzle 54 which has an aperture 58
therein. A gasket 55 provides a water-tight seal between the nozzle
54 and the nozzle base 50. On one side of the nozzle base 50 is an
inlet 51 for receiving tube 23 which brings water from the
combination pump and valve housing 19. Tube 23 and inlet 51
communicate with a duct 52 in the center of the nozzle base 50.
Encompassing the end of said duct is a flexible cap valve 53,
preferably made of an elastomeric material. The cap valve 53
surrounds the projected exterior of the base at the circumferal
surface 56. This cap functions as a check valve, allowing water to
flow from duct 52 into the interior of the nozzle 54 and out of
aperture 58 on the downward stroke of the pump and sealing the end
of duct 52 on the reverse stroke of the pump, thus preventing air
from being conveyed through tube 23 into the pump and valve
housing.
To be more specific, in the pressurized or downward movement of the
piston, water is forced from the tube 23 into duct 52. The water
being pressurized forces the flexible cap 53 to deform and separate
from base 50 at circumferal surface 56 and water will flow
therefrom. On the inside of nozzle 54, there are channels 57 which
allow the water that flows out at the circumferal surface 56 to
exit from nozzle 58. Upon the reverse stroke of the piston, the cap
53 is sucked or moved back into contact covering duct 52, thereby
re-establishing an airtight surface 56 between the cap 53 and the
housing 50. Though valve cap 53 is used in the present spray nozzle
24, any other check valve system may be employed to allow water to
enter the nozzle in the downstroke of the pump and to seal the
nozzle to prevent air from being injected into the pump during its
upstroke.
Another novel check valve 26, shown in FIG. 2, is mounted on the
end of tube 22 leading from the housing into the steam generation
chamber. The interior of the check valve 26 consists of an upper
internal bore 60 and a lower internal bore 62 separated by
diaphragm 61. The diameter of upper bore 60 is smaller than the
diameter of the lower bore 62. Diaphragm 61 has a slit across its
diameter. Due to the relative size of the upper and lower bores, 60
and 62, and the flexibility of diaphragm 61 with a slit therein,
the diaphragm deforms and opens allowing water under pressure to
proceed from tube 22 into a steam generating chamber and it resumes
its normal shape and closes the slit upon reverse pressure to
prevent water or steam from re-entering tube 22 during the reverse
action of the pump. The total body of check valve 26 is comprised
of a flexible material and the exterior is shaped so as to provide
a water-tight seal with the steam generating chamber. Obviously,
any standard check valve may be utilized on the end of tube 22.
A coupling 65 is mounted on the end of tube 21 to receive and
maintain the combination filter and check valve 25. The filter and
check valve, which is more fully discussed below, functions to
allow water to be drawn from the reservoir into the pump and valve
housing 19 during the upstroke of the pump and to prevent water
from leaving the pump housing 19 and re-entering the reservoir. It
also prevents residue in the water from leaving the reservoir.
The major component of the bi-stable valve is rocker 70, shown in
FIG. 2 and shown still more explicitly in FIGS. 4a and 4b. The
rocker 70 has a body including a fulcrum surface 71 which lies upon
the bottom of the slot or recess 48 in the pump base 40. On either
side of fulcrum 71 are two hemispherical protuberances 72 and 73
extending from the body. These protrusions are received in openings
41 and 42 of the pump base 40 which are tapered to form seats for
the rocker protruberances 72 and 73. On the top surface of the
rocker 70 is an angular cam surface or protrusion 74 having the
form of an obtuse angle. As can be seen from FIG. 4b, the rocker 70
is of the same shape as the slot or recess 48 of the pump base.
This allows the rocker to sit in the base and teeter therein while
preventing angular movement of the rocker. It should be noted that
the protrusions 72 and 73 project from the angular surfaces of the
body which form the fulcrum 71.
When the rocker 70 is placed within the recess of the pump base, it
will not naturally assume a position other than tilted fully in one
direction or the other because of the tapered seats 41 and 42 and
the fulcrum 71. Only a force applied perpendicular to horizontal at
the apex of cam surface 74 will allow the rocker to assume a
totally horizontal position where neither of the protrusions 72 or
73 are fully seated within openings 41 or 42. To revent the rocker
from being held in this horizontal position, or to allow the rocker
to assume only its two stable states, thereby being purely
bi-stable, the actuator 37 has the conical head 38 which
continuously engages angular cam surface 74 because of the action
of biasing member 39. Since cam surface 74 and actuator head 38
both form angular surfaces, the two members when forced together
cannot assume a stable state with their respective apexes' mating.
Consequently, the conical head 38 must rest on one side of the apex
of cam surface 74 or the other. Thus, the interaction of the spring
biased actuator against the rocker 70 provides a truly bi-stable
valve switching mechanism.
As can be seen clearly in FIG. 2, by moving the pump button or
handle 20 laterally to the right, the spring biased actuator slides
to the left of cam surface 74 and forces protrusion 72 into opening
and seat 41 thereby sealing outlet 43. The actuator 37 and its head
38, and rocker 70, retain this position during the up-down motion
of the pump handle. To change the valve to its other bi-stable
state, the pump button 20 is moved laterally to the left whereby
actuator head 38 rides over the apex of cam surface 74 and slides
down on the right side of cam surface 74, forcing protrusion 73 to
seat in opening 42, thereby sealing outlet 44. This position is
shown in FIG. 6. As in the other position, actuator 37 is received
telescopically within aperture 36 of the piston of the pump. The
valve rocker 70 remains in this stable state during the pumping
action of the pump button. FIG. 6 also shows the pump button 20
surrounding the pump housing 30 when the pump button is in the
fully down position of the pump action.
It can be plainly seen from FIGS. 2 and 6 that the valve of the
present invention is truly bi-stable, having its stable position
selected by lateral movement of the pump handle or button by the
ironer using a single finger. Thus the present bi-stable valve is a
combined pump housing reduces the number of movable parts and also
the number of individual selectors and dials that the user must
actuate during the operation of the iron.
FIG. 5 shows the combination filter and check valve 25 which is
received on coupling 65 at the end of tube 21. The combination
filter and check valve has a housing 80 with a bottom 89 which is
adjacent the bottom of the reservoir 18. Parallel to the bottom 89
is a bore 85 extending diametrically through the housing 80.
Location of bore 85 at the bottom of the housing 80 allows for all
the water in the reservoir to be received within the filter-check
valve for use in the moisture systems of the present iron.
Communicating with horizontal bore 85 is a vertical bore 84 which
communicates with the seat 82 of the check valve formed by an
inclined surface narrowing the diameter of major bore 81. A sphere
83 is contained within bore 81 and is received at seat 82 to seal
bore 84. Functioning as a check valve, an upward force draws sphere
83 up and allows water to be drawn up through bore 81 into tube 21.
Upon a downward pressure, the ball 83 is seated in seat 82 and
seals bore 84 to prevent water from re-entering the reservoir
through horizontal bore 85.
One of the novel features of the present combination check valve
and filter is the use of a spiral wire 88 surrounding the body of
the check valve 80 for preventing debris in the reservoir from
entering the check valve and the follow-on system including the
pump housing. The wire coil has a plurality of turns wherein the
top turn 87 is received within notch 86 of the check valve housing
80. The spiral wire has smaller or tighter turns at the top and
thus tapered assumes a substantially constant diameter later on
which is displaced and parallel to the body 80. The spring rests on
bottom 89 of the check valve body 80. The space between the spiral
elements 88 is sufficient to allow water to enter horizontal bore
85, yet small enough to prevent large pieces of debris from
entering the check valve.
The present combination filter and check valve 25 may be replaced
by standard filters and check valves and check valve 26 and valve
cap 53 may also be replaced by standard check valves. Though those
three mentioned check valves may be replaced by standard check
valves, they provide three novel approaches to inexpensive and
effective check valves which have a function other than merely
regulating the flow, thus reducing the number of parts and the
amount of space needed.
As mentioned previously, the present steam-spray iron provides four
modes of operation. These modes are dry, constant steam, atomized
spray, and high velocity steam. The inventive combination pump and
bi-stable valve of the present invention allows for selection
between the atomized spray and the high velocity steam by mere
lateral movement of the pump handle or button. Also included herein
are three novel check valve systems for use in combination with the
pump-bi-stable valve.
Although the invention has been described and illustrated in
detail, it is to be clearly understood that the same is by way of
illustration and example only and is not intended to be taken by
way of limitation, the spirit and scope of this invention being
limited only by the terms of the appended claims.
* * * * *