(57) The invention is concerned with releasably assembling component parts of a device
such as the spray unit (20) of a shower head (10). A first component part (40) is
formed with a cylindrical member (44) having three equispaced and radially extending
lugs (45) and is adapted to engage within an annular portion (34) of a second component
part (30). The annular portion (34) of component (30) includes three equispaced cam
surfaces (36) formed in the inner walls thereof for co-operation with the said lugs
(45), the cam surfaces having recesses (37) adapted to receive the lugs (45) of the
first component (40), whereby insertion of the cylindrical portion (44) of the first
component (40) into the annular portion (30) of the second component (30) and rotation
thereof causes the lugs (45) to co-operate with the cam surfaces (36) and snap into
the recesses (37) thereby locking the components together. At least one of the component
parts should be formed from a resilient plastics material.
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