CA1055836A - Steam iron having improved feed valve - Google Patents
Steam iron having improved feed valveInfo
- Publication number
- CA1055836A CA1055836A CA270,594A CA270594A CA1055836A CA 1055836 A CA1055836 A CA 1055836A CA 270594 A CA270594 A CA 270594A CA 1055836 A CA1055836 A CA 1055836A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- valve member
- plastics part
- steam iron
- aperture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Irons (AREA)
- Details Of Valves (AREA)
- Lift Valve (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A steam iron is provided with a feed valve to supply water to a vaporising chamber. The feed valve comprises a valve member of metal which is encased in a plastics part, both the valve member and plastics part having a through flow aperture which supplies water to the vaporisation chamber in response to operation of a valve stem. The said plastics part is so shaped and arranged that it extends into the vaporisation chamber.
In this way deposits of lime on the outer surface of the plastics part is avoided and movement of the valve stem in the aperture prevents lime deposits on the stem or in the aperture.
A steam iron is provided with a feed valve to supply water to a vaporising chamber. The feed valve comprises a valve member of metal which is encased in a plastics part, both the valve member and plastics part having a through flow aperture which supplies water to the vaporisation chamber in response to operation of a valve stem. The said plastics part is so shaped and arranged that it extends into the vaporisation chamber.
In this way deposits of lime on the outer surface of the plastics part is avoided and movement of the valve stem in the aperture prevents lime deposits on the stem or in the aperture.
Description
~ 5 S ~3 ~
This invention concerns steam irons and more particularly a feed valve for automatic steam irons which valve consists of a valve stem and valve member, In automatic steam irons the qu.antity of water required for the steaming process is conveyed dropwise from a water tank into an electrically heated vaporisation chamber, The required metering is effected via a feed valve, Automatic steam irons are already known which use a valve member made of metal or a heat-resistant silicone rubber for the feed valve, The valves have the disadvantage that valve members made of metal have a very great tendency to calcify on their outer surfaces and in the course of time the lime deposits take on such dimensions that the - lS throughflow aperture becomes incrusted in a drop shape and can no longer be kept open even by the valve stem extending therethrough, Valve members made of silicone rubber h~ve the disadvantage that in the course of time lime deposits on the valve stem enlarge the cross-section of the hole in the valve member when the feed valve is actuated and thus the quantity of water flowing ~ through becomes so great that the heat capacity of the : - 2 -551~3~
heater is no longer sufficlent to vaporise the water present in the steam chamber and unvaporised drops of water emerge from the sole plate of the iron, It is an object of thîs invention to provide a feed valve for a steam iron the ~ndividual parts of which present no surfaces for incrustation by lime precipitated upon vaporisation, : Accordingly the invention provid~sfor a steam iron ; a metal valve member provided with a throughflow aperture which valve member is encased by a plastics par-t arranged to extend into the vaporisation chamber of a steam iron, According to another aspect of the invention there is provided a steam iron having a water supply ~ontainer ~, ` and a vaporisation chamber communicating with each other , 15 through a feed valve which comprises a metal valve member encased in a plastics part, which extends into the vaporisation chamber, an aperture for water flow being provided through said metal valve member and said plastics part and a valve stem for regulating the flow of water through said aperture into said vaporisation chamber, . Preferably the plastics part and the v~lve ~:
member are connected to each other, and in one preferr,ed - 3 - .
'.
' ~ ;. , - ; : , ~ , , ", , ~ . ., . , ~ ~
5 ~ 3 ~
embodiment of the invention, the valve member has an annular groove in which the plastics part ls retained~
In this way it is ensured that, by using a metal valve member which is encased by a heat-resistant, water-repellent plastics part of constant shape, the deposit of lime on the outer surface is avoided and a constant throughflQw quantity is maintained On the other hand, lime deposits on the valve stem and in the throughflow aperture are prevented by the movement of the valve stem in the metal valve member, The quantlty of water Elowing through the valve ls not reduced b~ any incrustation resulting from lime deposit On the other hand, vaporisa~on residues have no opportunity of being deposited on the surface of the valve member facing the~vaporisation chamber Even over a long period of use, a valve according to the invention ensures that a constant quantity of steam is produced per unit of time One embodiment by way of example of the invention is s~own in the accompanying drawings which show part of an automatic steam iron in cross-section~ The drawing . shows the valve region of the steam iron which has a sole plate 1, a vaporisation chamber 2 and a heater 3 The-.
~ ~ 5 ~ 3 ~
vaporisation chamber 2 is sealed of:E at the top by a cover portion 4, in the usual way, Above the vaporisatlon chamber 2 is mounted a water supply container 5 which is connected to the vaporisation chamber 2 via a feed valve - 5 6, The feed valve 6 has a metal valve member 7 which is : encased by a plastics part 8 which extends into the vaporisation chamber 2, The plastics part 8 is retained in an annular groove 9 in the valve member 7, The valve member 7 and the plastics part 8 are provided with a through aperture 10~ The feed valve 6 is screwed to the water supply container 5, A valve stem 11 serves to open and close the throughflow aperture 10, Water inlet apertures 12 are provided in the valve member 7 inside the container 5, Between the water supply container 5 and the cover portion 4 the feed valve 6 is surrounded by an elastically deformable sleeve 13, .
~' ' ' '', ' ' '- ' ' . ' ~
This invention concerns steam irons and more particularly a feed valve for automatic steam irons which valve consists of a valve stem and valve member, In automatic steam irons the qu.antity of water required for the steaming process is conveyed dropwise from a water tank into an electrically heated vaporisation chamber, The required metering is effected via a feed valve, Automatic steam irons are already known which use a valve member made of metal or a heat-resistant silicone rubber for the feed valve, The valves have the disadvantage that valve members made of metal have a very great tendency to calcify on their outer surfaces and in the course of time the lime deposits take on such dimensions that the - lS throughflow aperture becomes incrusted in a drop shape and can no longer be kept open even by the valve stem extending therethrough, Valve members made of silicone rubber h~ve the disadvantage that in the course of time lime deposits on the valve stem enlarge the cross-section of the hole in the valve member when the feed valve is actuated and thus the quantity of water flowing ~ through becomes so great that the heat capacity of the : - 2 -551~3~
heater is no longer sufficlent to vaporise the water present in the steam chamber and unvaporised drops of water emerge from the sole plate of the iron, It is an object of thîs invention to provide a feed valve for a steam iron the ~ndividual parts of which present no surfaces for incrustation by lime precipitated upon vaporisation, : Accordingly the invention provid~sfor a steam iron ; a metal valve member provided with a throughflow aperture which valve member is encased by a plastics par-t arranged to extend into the vaporisation chamber of a steam iron, According to another aspect of the invention there is provided a steam iron having a water supply ~ontainer ~, ` and a vaporisation chamber communicating with each other , 15 through a feed valve which comprises a metal valve member encased in a plastics part, which extends into the vaporisation chamber, an aperture for water flow being provided through said metal valve member and said plastics part and a valve stem for regulating the flow of water through said aperture into said vaporisation chamber, . Preferably the plastics part and the v~lve ~:
member are connected to each other, and in one preferr,ed - 3 - .
'.
' ~ ;. , - ; : , ~ , , ", , ~ . ., . , ~ ~
5 ~ 3 ~
embodiment of the invention, the valve member has an annular groove in which the plastics part ls retained~
In this way it is ensured that, by using a metal valve member which is encased by a heat-resistant, water-repellent plastics part of constant shape, the deposit of lime on the outer surface is avoided and a constant throughflQw quantity is maintained On the other hand, lime deposits on the valve stem and in the throughflow aperture are prevented by the movement of the valve stem in the metal valve member, The quantlty of water Elowing through the valve ls not reduced b~ any incrustation resulting from lime deposit On the other hand, vaporisa~on residues have no opportunity of being deposited on the surface of the valve member facing the~vaporisation chamber Even over a long period of use, a valve according to the invention ensures that a constant quantity of steam is produced per unit of time One embodiment by way of example of the invention is s~own in the accompanying drawings which show part of an automatic steam iron in cross-section~ The drawing . shows the valve region of the steam iron which has a sole plate 1, a vaporisation chamber 2 and a heater 3 The-.
~ ~ 5 ~ 3 ~
vaporisation chamber 2 is sealed of:E at the top by a cover portion 4, in the usual way, Above the vaporisatlon chamber 2 is mounted a water supply container 5 which is connected to the vaporisation chamber 2 via a feed valve - 5 6, The feed valve 6 has a metal valve member 7 which is : encased by a plastics part 8 which extends into the vaporisation chamber 2, The plastics part 8 is retained in an annular groove 9 in the valve member 7, The valve member 7 and the plastics part 8 are provided with a through aperture 10~ The feed valve 6 is screwed to the water supply container 5, A valve stem 11 serves to open and close the throughflow aperture 10, Water inlet apertures 12 are provided in the valve member 7 inside the container 5, Between the water supply container 5 and the cover portion 4 the feed valve 6 is surrounded by an elastically deformable sleeve 13, .
~' ' ' '', ' ' '- ' ' . ' ~
Claims (6)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A steam iron having a water supply container and a vaporisation chamber communicating with each other through a feed valve which comprises a metal valve member encased in a plastics part which extends into the vaporisation chamber an aperture for water flow being provided through said metal valve member and said plastics part and a valve stem for regulating the flow of water through said aperture into said vaporisation chamber.
2. A steam iron as claimed in claim 1 wherein said plastics part and said valve member are connected together.
3. A steam iron as claimed in claim 1 wherein said valve member has an annular groove in its surface in which said plastics part is retained.
4. A feed valve for a steam iron comprising a metal valve member having a throughflow aperture, said valve member being encased by a plastics part which is arranged in use to extend into the vaporisation chamber of a steam iron, the throughflow aperture of the valve member extending through the plastics part into the vaporisation chamber.
5. A feed valve as claimed in claim 4 wherein said valve member and said plastics part are connected together.
6. A feed valve as claimed in claim 4 wherein said valve member has an annular groove in its surface in which said plastics part is retained.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762604396 DE2604396A1 (en) | 1975-02-13 | 1976-02-05 | FUEL OIL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1055836A true CA1055836A (en) | 1979-06-05 |
Family
ID=5969084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA270,594A Expired CA1055836A (en) | 1976-02-05 | 1977-01-27 | Steam iron having improved feed valve |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1055836A (en) |
-
1977
- 1977-01-27 CA CA270,594A patent/CA1055836A/en not_active Expired
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