Patent GB-485677-A (GB)
Title: Improvements in or relating to apparatus for coating the wall interiors of hollow articles with fluids
IPC: B05C7/04
Filed: 1936-12-07
Abstract: <PICT:0485677/III/1> Paper pots &c. 12 are coated internally by apparatus which includes one or more movably mounted tables 1, 2, carrying batches of pots &c. on their upper faces, the platform or platforms being lowered below and then raised above the level of the coating fluid in a supply tank &c., 37, the fluid being conducted into and from the pot &c. interior.  The apparatus comprises hollow tables 1,2, with manually positioned cartons 13 thereon connected by a fluid transferring pipe 7.  The tables are carried by parallel-motion mechanism 3, 6, 1c, 2c and are oscillated, see-saw fashion, by an electric motor through reduction and friction clutch gear and an adjustable throw crank and connecting rod 54, the motor being set in motion by a switch gear 30, 31 automatically made when the carton &c. top closure devices 20a 20, 21 for the upper bank of cartons, are all closed.  For this purpose the top closure devices 20, spring urged about and pivotally mounted on a shaft 25, comprise backwardly projecting tongues 20b which when the tops are open, engage between collars on the longitudinally spring urged shaft 25. One tongue 20c longer than the others in a bank, on the movement of the corresponding closure device, disengages a spring urged catch to allow, when it is closed, the rod 25 to move longitudinally and to make the switch and set the motor in motion to change the vertical positions of tables 1, 2.  The springs 33 for the shafts 25 are compressed by rods 34 reciprocated about points 34b by pin engagements at 35 on lever 6.  The coating fluid, supplied by a heated constant lever tank 37 through a pipe 36 and a 3-way valve <PICT:0485677/III/2> <PICT:0485677/III/3> 46, then flows from the lower bank of cartons to the upper bank on the downward motion of the latter.  The tank 37, with ball valve 38, is fed through a pipe 43, a 3-way cock 44 allowing of cleaning fluid being run in through the pipe 45, when required.  A manually operable rod 42 permits drainage through the valve 37b, the pipes 47 being also fitted for this purpose.  The tank 37 and pipe 36 may be jacketed at 39, 40, a steam connection 41 being fitted therebetween.  The open bottoms of the cartons &c. 12 are positioned on sponge-rubber gaskets 11, but if smaller cartons are to be internally coated, adaptors 14 may be fitted to the tables 1, 2 to and held in place by bayonet joints 15, the cartons then bedding on gaskets 16.  A screw connection 17 between parts of the adaptor allows of adjustment for the height of the carton &c.  The top closure devices 20 are each fitted with curved vent pipes 23 which may drip into draining cups when the tops are opened. Instead of the rigid pipe 17, with slidable flange connections held in place by spring-urged shackles, rubber &c. pipes may be fitted from the supply.  Stop mechanism, actuated by a solenoid, and engaging with two slots in the crank disc, maintains the tables 1, 2, in their respective positions.  The Provisional Specification indicates the use a Bowden cable, actuated from the table-carrying arms, for compressing the spring which moves the switch rods.