Fluid sprinkling – spraying – and diffusing – Unitary plural outlet means – Having interior filter or guide
Reexamination Certificate
2000-03-14
2001-06-05
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Unitary plural outlet means
Having interior filter or guide
C239S462000, C239S504000, C239S523000, C239S524000, C239S548000, C239S554000, C239S559000, C239S567000, C239S590300, C239S596000, C239SDIG002
Reexamination Certificate
active
06241166
ABSTRACT:
This invention relates to a shower head rose.
The shower head roses concerned may be of relatively large diameter, for example substantially 101.6 mm (4 inches), 127 mm (5 inches), 152.4 mm (6 inches), 203.2 mm (8 inches), 254 mm (10 inches), 304.8 mm (12 inches) in diameter.
Shower head roses are known having an outer body of brass of an inverted-cup shape into an open mouth of which is fitted a circular spray plate of brass permanently clamped to the outer body by annular formations formed in the body by metal spinning; the outer body extending beyond the spray plate as an annular skirt which encircles the water spray emergent from the spray plate.
A number of drawbacks can arise with such known shower head roses. Deflections of the supplied water within the outer body can cause the water spray emergent from the spray plate to be deformed such that individual streams may cross one another instead of being generally parallel; the crossing over being an effect known as “chiselling”. At relatively high input water pressure, the spray plate can be forced out of the body. Normally the shower head roses are finished by chromium plating the outer surfaces of the outer body and the spray plate. As part of the procedure a coating of nickel is laid down on the brass. This coating is yellow. There can be some difficulty in getting the chromium-plating solution into the internal annular corner between the outer body and the spray plate. Thus the corner is not properly chromium-plated leaving yellow nickel uncovered to look like rust forming in the corner, which is not a desirable appearance to create. Also the plating solution can get inside the body and get trapped behind the spray plate making it difficult to fully drain off.
An object of the invention is to provide a construction of shower head rose which enables a shower head rose to be made which avoids one or more of the aforesaid drawbacks.
According to the invention there is provided a shower head rose comprising a first chamber comprising an outer wall or body and having an entrance to receive a supply of water, a second chamber defined by a second chamber wall comprising a first wall part and a second wall part, said first wall part being formed with water inlets opening into the first and second chambers whereby water from the first chamber can enter the second chamber, said second wall part being formed with water outlets through which water can emerge from the second chamber as relatively fine streams or spray, and said second chamber being disposed in the outer wall or body and clamped thereto by connection means urging the second chamber in a direction towards said entrance.
Preferably the first chamber is provided with deflection or baffle means for the supply of water along a first direction through the entrance to impinge on the deflection or baffle means and be deflected into one or more paths each along a direction transversely to said first direction and towards a water deflecting inner surface of the first chamber in which said inner surface is spaced from aforesaid water inlets.
Preferably, externally of the second chamber an outer surface of at least a portion of said first wall part is of a form which is generally convex or bulging outwardly with respect to the second chamber. Preferably, the convex or outwardly bulging form of said outer surface of said portion of the first wall part is of substantially conical shape. In another embodiment, the convex or outwardly bulging form of said outer surface of said portion of the first wall part may be of substantially segmental spherical shape. The said convex or outwardly bulging form of said portion of said first wall part may face in a general direction towards said entrance. One or more of said water inlets may each have a first side and an opposite second side, and the first side may be nearer to a top or crest of said convex or outwardly bulging form of said portion of said first wall part than the second side of the water inlet is to a base of said convex or outwardly bulging form of said portion.
Preferably, a seal is provided between the outer wall or body and the second chamber wall, and said seal surrounds the second chamber wall and makes water-tight contact therewith and with the outer wall or body. The seal may comprise a rubber. For example the seal may be a rubber O-ring. Preferably the connection means may be provided between the outer wall or body and the second chamber wall, said connection means being adapted for action causing clamping of the seal between the outer wall or body and said second chamber wall. If desired, the connection means may comprise a screw-threaded arrangement to oppose separation of the second chamber for said outer body or wall. The screw-threaded arrangement may be operable to vary clamping force exerted on the seal.
The second chamber may have an internal cross-sectional area in a plane transverse to emergent directions of aforesaid water spray from the second chamber, and said cross-sectional area may be a plurality of times greater than a total cross-sectional area of the said water inlets. The said internal cross-sectional area of the second chamber may be at least twenty times greater than the said total cross-sectional area of the water inlets, for example it may be at least forty times greater.
Aforesaid water inlets may be disposed in an array about an axis of revolution of the second chamber. The array may be a circle substantially centred on the axis, and a centre of each of at least three of said water inlets may lie substantially on said circle.
If desired, said second wall part is a spray plate having a turned over peripheral rim clamping onto a peripheral rim of the first wall part to form an external peripheral lip on the second chamber wall. An aforesaid seal may be disposed between the lip and an abutment on the outer wall or body.
Said outer wall or body may extend beyond the second wall part to provide a skirt which surrounds the emergent spray.
One or more water drain holes may be provided through the first wall part adjacent to a or the base of said convex or outwardly bulging form of said outer surface of said portion.
REFERENCES:
patent: 977389 (1910-11-01), Heldt
patent: 1891720 (1932-12-01), McCurdy et al.
patent: 1930227 (1933-10-01), Donahue
patent: 2086017 (1937-07-01), Donahue
patent: 2690930 (1954-10-01), Corson
patent: 2779625 (1957-01-01), Filliung
patent: 2874001 (1959-02-01), Webb
patent: 3081404 (1963-03-01), Hartmann
patent: 3831860 (1974-08-01), Gullaksen et al.
patent: 6113002 (2000-09-01), Finkbeiner
patent: 0 284 763 (1988-05-01), None
Gauntlet Leonard Paul
Overington John
Evans Robin O.
Michael & Best & Friedrich LLP
Purdie Elcock Limited
Scherbel David A.
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