Patent GB-1426945-A (GB)
Title: Method and device for enamelling an object
IPC: C23D5/04
Filed: 1973-05-22
Abstract: 1426945 Enamelling apparatus SOC GENERALE DE FONDERIE 22 May 1973 [27 June 1972] 24493/73 Heading C1M A method of enamelling a heated, substantially vertical surface of an object comprises supplying enamel, in a direction substantially parallel to the substantially vertical surface, and simultaneously directing, using a gas jet, at least a portion of the enamel towards the substantially vertical surface to impinge enamel thereon. In a preferred embodiment a heated everted rim of a bath or wash basin is enamelled, the rim comprising a substantially vertical surface presented by an outer edge of the rim, the enamel being allowed to fall on to and near the outer edge of the rim. The invention also relates to a device for enamelling a heated object having a substantially vertical surface comprising an enamel-dusting unit and a support therefor, means for adjusting the position of the unit with respect to the substantially vertical surface of the object to be enamelled, a nozzle positioned with respect to the dusting-unit support so that the axis or an extension thereof of the nozzle intersects the vertical centre-line or an extension thereof of the dusting unit and means for producing a gas stream to pass through the nozzle, whereby enamel supplied from the dusting unit in a direction substantially parallel to the substantially vertical surface of the object is simultaneously directed by the gas stream, so that at least a portion of the enamel impinges on the substantially vertical surface. In one embodiment (Figs. 1, 2) the support for a dusting unit constituted by a sieve 5 comprises an articulated frame 1 and a turret 3. The frame comprises a boom 2 which is pivotally. mounted on the turret 3 and a fore-boom 4 which carries the sieve 5. The object to be enamelled, e.g. a bath, 12 is placed upright on a table 14 which is capable of rotation about a vertical axis and of horizontal translation so that the entire rim 13 of the bath 12 and its vertical termination 14 passes beneath the sieve 5. A blowing nozzle 11 is pivotally mounted on the turrent 3 and connected to means for producing a gas stream which may be air or nitrogen. The nozzle 11 is so arranged with respect to the turret 3 and the frame 1 that the axis Y-Y<SP>1</SP> of the nozzle intersects the vertical axis of the sieve 5. Means are provided for regulating the flow of gas through nozzle 11 and these comprise an iris-type diaphragm 16 which is mounted at the inlet of a duct 23 through which air is admitted into the nozzle 11 and further comprises a circular butterflyvalve 24 which serves to control flow rate. The nozzle is equipped with a fan as shown in Fig. 2. The rate of gas flow through 11 is intended to vary in direct proportion to the distance. At the commencement of the enamelling process the bath is displaced in horizontal motion in a direction parallel to its longest side. The enamel flux dust is directed on to the rim 13 and its vertical termination 14. When the bath's longest side has been coated the bath is rotated so that one of its shortest sides is coated. The bath takes up position 12a and then that surface of the rim 13a which is located beneath the sieve 5 is much larger and the vertical termination 14a is much closer to the nozzle 11. To take this into account the sieve 5 is moved backwards to position 5a in synchronism so that the surfaces to be enamelled are maintained vertically beneath the sieve.