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    Nozzles
    2.
    发明授权
    Nozzles 失效

    公开(公告)号：US3007438A

    公开(公告)日：1961-11-07

    申请号：US68313757

    申请日：1957-09-10

    Applicant: THORN ELECTRICAL IND LTD

    Inventor： ALEKSANDER LANCUCKI MARIAN ,  WILLIAM STRANGE JOHN

    IPC: B05B15/04 ,  E03C1/084 ,  H01J9/20

    CPC classification number: H01J9/20 ,  B05B15/0406 ,  E03C1/084

    Abstract: Apparatus for coating the interiors of lamp bulbs with a suspension comprises a chamber 1 for the suspension which is in communication with the atmosphere, a filter 2 in the chamber, a pump 4 connected to draw the suspension continuously from the chamber 1 through the filter 2 to a nozzle 6, having at least one continuously open orifice through which the suspension flows continuously during operation of the pump, means for returning excess suspension from the nozzle 6 to the chamber 1, e.g. a trough 7 and a pipe 8, and means, e.g. a valve 10 in a by-pass pipe 9, for controlling the flow of suspension delivered through the orifice. The valve 10 may be automatically regulated by means responsive to the positioning of a bulb over the nozzle 6, the valve 10 being then wholly or partly closed, the suspension then being emitted from the nozzle orifice in the form of a jet. A loose-fitting lid 3 on the chamber 1 permits the suspension to communicate with the atmosphere. Returning suspension entering the chamber 1 by the pipe 8 serves to stir suspension in the chamber 1, the filter 2 being provided above an outlet pipe 11. In a modification, the valve 10 is retained, but regulation of flow of suspension from the nozzle 6 is provided by subsidiary orifices, e.g. longitudinal slits in the side walls of the nozzle and an external coaxial sleeve valve on the nozzle 6 which is rotated to close the slits during a coating operation, e.g. by engagement of a bulb with a handle on the sleeve. In another modification, Fig. 4, the nozzle 6 is slidable on the end of a pipe 5 leading from the pump 4 and is normally upwardly urged by a spring 21 to maintain subsidiary orifices 24 in the side walls of the nozzle 6 above the end of the pipe 5. The placing of a bulb on wings 26 on the nozzle 6 forces down the nozzle 6, the pipe 5 closing the orifices 24. A stop 19 working in a slot 20 in the wall of the nozzle 6 limits vertical movement of the nozzle 6. A baffle 25 directs suspension emerging from the orifices 24 to the trough 7. More than one main orifice 23, and only one subsidiary orifice 24, may be employed, and according to the Provisional Specification, one orifice only may be provided in the nozzle 6, the effective area of the orifice being varied to control the delivery of suspension from the nozzle 6.

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