Patent GB-733334-A (GB)
Title: Improved methods and apparatus for processing interior surfaces of tubular containers and other articles
IPC: B05B13/06
Filed: 1951-05-02
Abstract: Apparatus for processing the interior surfaces of tubular articles comprises a carriage to support the articles for substantially horizontal rectilinear motion in a direction substantially parallel to their axes, a cantilever support positioned to enter the interior of an article when so moved, a burnishing device and a coating device both mounted on the free end of the cantilever support, and control means arranged so that the burnishing device and the coating device are in operative relation to the surface to be processed as an article is moved on the carriage toward the cantilever support, but the burnishing device is disengaged from operative position as the carriage is moved away therefrom.  The carriage may have means for rotating an article about an axis thereof.  As shown, upstanding members 20 support longitudinal side members such as 24, on which a carriage 28 rides on small rollers.  Two longitudinal supporting bars are mounted on the carriage 28, and on these are mounted small rollers which support the article 10 to be treated, and permit its rotation about its axis.  A protruding arm connects the carriage 28 to a chain 42 at a point 40, the chain 42 running over idlers 44, 46 and a sprocket wheel 114, which is driven, through a reduction gear box 112, by a reversible electric motor 110.  A motor 210 and a flame spray unit 212 are mounted on an I-beam 216 which is mounted cantilever fashion on two upstanding beams 218, the motor 210 being on a parallel linkage consisting of pairs of arms 220, 222, the lower links 222 having bell-crank extensions which are interconnected by a cross support member 226.  A rod 228 connects the lower linkage to a solenoid operating device 230 for raising the motor 210 which drives a burnishing brush 234.  The flame spray unit 212 comprises a nozzle unit 236 and a blast tube 238, the lower end of which is surrounded by a spaced tubular sleeve, secured thereon by set screws, or pivoted <PICT:0733334/III/1> on an arm extending therefrom, and supported by a roller running on the article 10, the set screws being loosened in this case. The nozzle unit 236 is supplied with a powdered composition (e.g. polythene) from a supply means 16, which may be controlled by a vibratory means, and sprays it in molten form down the blast tube 238.  In operation, an article 10 is placed on the carriage in its extreme right-hand position, and the motor 110 started through suitable relay contacts by closing a foot switch 310 with which a normally closed, but now open, limit switch 312 is connected in parallel.  This causes the carriage 28 to move to the left allowing the switch 312 to close.  The brush 234 burnishes the portion to be coated, the motor 210 being in its lowered position, and the flame spray unit 212 subsequently applies a coating thereto. When the carriage 28 reaches its most left-hand position it closes a normally-open limit switch 314 which may be connected to relay means which causes reversal of the motor 110 and may (1) energize solenoid 230 to raise the brush 234, (2) cut off the supply means 16, (3) close holding contacts for holding the relay in operating position after movement of the carriage 28 allows switch 314 to open.  This holding circuit is broken when the carriage opens the limit switch 312.  Specification 733,401, [Group XXIX], is referred to.