Patent GB-458860-A (GB)
Title: Improvements in or relating to spray painting and the like
IPC: B05B13/00
Filed: 1935-05-25
Abstract: <PICT:0458860/III/1> <PICT:0458860/III/2> A machine for treating the outer surface of a stationary railway coach or wagon with paint, varnish, cleansing fluid, or the like, comprises a spray gun mounted on a compound carriage, the parts of which are so moved that the gun is traversed in two dimensions over the surface, movement in one dimension being to-and-fro, and in the other dimension step-by-step. Such a machine is shown in Figs. 1 and 2, and comprises a wheeled platform 10 running on a double track 12 extending along each side of the coach.  A framework 13 carries a shield comprising a back plate 14 and adjustable side and top plates 15, 16.  The back plate is provided with inspection windows 17, and the interior of the shield is illuminated by lamps 18.  At the bottom of the shield is an air extractor funnel 19 connected with a fan 20 and a baffled fume box 20a.  A paint gun 22 is mounted on a counterbalanced slide 23 engaging vertical guide rails 25, and operates through a vertical slot 26 in the back plate 14.  The slide 23 is moved by means of an endless belt 27 arranged over pulleys 28, 29, a variable speed gear coup ling the motor 21 to the pulley 29.  The slide 23 can be connected alternately with the upgoing and downgoing sides of the belt 27 by a compressed-air-operated device 32, the piston <PICT:0458860/III/3> <PICT:0458860/III/4> rod 33 of which engages belt-gripping members 34 which co-operate with brackets 38 on the slide.  The device 32 is controlled by stops 62, on a rod 63, which are engaged by a rod 61 on the slide 23.  Rollers on the gun 22 engage cam tracks 44 shaped to the contour of the coach side.  The needle valve of the paint gun is pneumatically controlled by a rotary valve which may be turned by the passing engagement of the cross-bar 78 with yieldable arms 79, 80, adjustably mounted on a vertical rod 83.  This rod can be turned, by means of the handle 86, into operative position when it is desired to stop the paint spray while passing a window in the coach being painted.  Compressed air is supplied through a valve 87 and air storage cylinders 88, and passes, in part through an electric heater 89, by pipes 90, 91 to the device 32, to the needle valve control device, and to the paint gun.  Paint is supplied to the gun from a container 93 to which compressed air is applied through the pipe 94.  The horizontal traverse of the machine is effected by ratchet mechanism 95, 97, operated by a pneumatically moved piston rod 99, the rotary compressed-air valve 101 being controlled by a dashpot 106 and operated by the engagement of the bracket 49 with collars 108, 111, on rods 51, 52 pivoted to the lever 105.  The belt clamping device and the traversing ratchet device may be operated electrically instead of p  pneumatically.  In order that the machine may be moved round to the other side of the coach road 113 after one side of the coach has been painted, a ramp 114, engaging a castor wheel 115 on the machine, is provided.  According to the Provisional Specification, the horizontal traverse of the machine may be continuous instead of step-by-step.