Electric resistance heating devices – Heating devices – Vaporizer
Patent
1991-10-26
1994-04-19
Bartis, Anthony
Electric resistance heating devices
Heating devices
Vaporizer
219437, 219440, 220306, 220308, 220DIG14, 220DIG20, 392325, 392401, 392447, F22B 128, F22B 3704, H05B 382
Patent
active
053054156
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a steam generator particularly, though not exclusively, for use in a wallpaper steamer.
BACKGROUND OF THE INVENTION
Wallpaper steamers are known for moistening old wallpaper so that it can be readily removed from walls prior to redecorating.
In a steam generator for a prior wallpaper steamer, we attach the lid to the base of the steamer by means of C-section metal strips slid onto abutting flanges of the lid and base--which are of moulded plastics material. This means of attachment of the lid is restrictive on the design of the generator--i.e. requiring straight runs of the strip along the joints, making the generator rectangular. The strips add expense and assembly cost.
The present steam generator has been developed as a simpler, cheaper product.
Plastics material containers are known in which the lid resiliently engages the base and seals sufficiently tightly for storage of food for instance at ambient pressure. The lid has a circumferential groove into which an upstanding rim of the base extends. This arrangement is inadequately pressure tight for a steam generator. In particular a separate sealing element appears to be necessary.
THE INVENTION
A steam generator of the invention comprises: inter-engagement zone; with an engagement face directed generally away from the base (when assembled thereto); with an engagement face directed generally away from the lid (when assembled thereto); circumferential inter-engagement zone, between the base and the lid; with resilient deformation of either or both of the lid- and base-engagement members on assembly of the lid to the base so as to compress the sealing ring for sealing contact with both the base and the lid.
Preferably, the engagement face(s) of at least one of the lid- and base-engagement members is a lip adapted and arranged to engage the corresponding engagement face of the other engagement member(s). In the preferred embodiment, the engagement faces of both of the lid- and base-engagement members are respective lips, each adapted and arranged to engage the corresponding lip on the corresponding other engagement member. Conveniently, one of the lid- and base-engagement members extends generally towards the base or lid respectively and the other of the engagement members extends adjacent to the one engagement member (when assembled thereto).
Preferably, one or other of the base and lid, conveniently the base, includes a recessed seat for the elastomeric sealing ring and the other of the base and the lid has a plain sealing surface opposite the recessed seat. The recessed seat and the plain sealing surface are preferably arranged inwardly of the lid- and base-engagement members.
It is envisaged that the lid- and the base-engagement member(s) may be continuous circumferentially around the lid and the base. However if the or each lid-engagement member is arranged outwardly of the respective base-engagement member, its lip is difficult to remove from the moulding tool unless an expensive/complex tool is used. If a continuous base-engagement member engaging outside the lid-engagement member is used, even more severe difficulties are encountered. Accordingly it is preferred to employ a plurality of separate individual engagement members distributed circumferentially around the lid and the base. Moulding difficulties may still be encountered if the lid engagement members are outermost; accordingly they are preferably provided inwardly of the base engagement members and respective apertures are provided between the sidewall of the base and the individual base-engagement members for receiving the corresponding lid-engagement members. This arrangement permits a simple mould to be used.
The radially inner edge of each aperture may be provided with a stiffening flange, conveniently connected to the sidewall by one or more struts, and the corresponding lid-engagement member may be provided with an anti-disengagement surface, conveniently on a rib, abutting the stiffening flange.
The individual base-engagement mem
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Bartis Anthony
Earlex Limited
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