Patent GB-472315-A (GB)
Title: Improvements in or relating to apparatus for treating leather or other fibrous material with liquid under pressure
IPC: C14B1/00
Filed: 1936-02-21
Abstract: <PICT:0472315/IV/1> <PICT:0472315/IV/2> <PICT:0472315/IV/3> <PICT:0472315/IV/4> <PICT:0472315/IV/5> <PICT:0472315/IV/6> An apparatus for impregnating leather or other fibrous material with liquid, specially intended for tempering leather soles, comprises a pressure-sustaining receptacle for the work and liquid having a power-operated closure, power-operated means to raise the pressure in the receptacle, automatic means to relieve the pressure after a predetermined treatment and to release the closure and retract same to permit change of work.  The receptacle 10 has a closure 12 supporting a perforated work container 150. A gasket 20 provides a pressure tight joint when the closure is held against it by slides 14 with sloping ends engaging a bevel 17 on a ring secured to the receptacle.  The slides 14 have teeth gearing with pinions 81 themselves gearing with a cylindrical rack 80 on a piston rod 36 secured to a piston reciprocating in a cylinder 33 carried by a cross-head 30 secured to rods 24 forming guides for sleeves 25 secured to the closure 12.  An electric motor drives a pump supplying water to a control valve provided with two channels 116, 117 co-operating with an inlet pipe 96, pipes 101, 125 leading to the top and bottom, respectively, of the cylinder 33, and an exhaust port 158.  In the position shown, a control handle for the valve is latched in position by a lug 140 on a lever 141 engaging a pin 138 on the handle.  Pressure fluid from the pipe 96 depresses the piston 35 until the closure 12 is secured, pressure fluid then lifting a valve 130 and passing by a pipe 103 past a diaphragm 153 and a ball 154 to a pipe 106 opening into the receptacle 10.  The valve 130 is byepassed by a small port 129 and also by a passage 172 normally closed by a valve 170. In one form, when full pressure has been reached in the chamber 10 pressure fluid passes by a pipe 180 to raise a piston 182 against an adjustable spring 184 to trip the latch 140.  The valve control handle is then reversed by a spring 146, the pressure in the receptacle being reduced as soon as the diaphragm 153 can uncover an exhaust pipe 161, and the closure 12 is raised to permit change of work.  In a modification, a dashpot is substituted for the piston 182, an oil-containing cylinder 50 housing a piston 54 formed with a valve seat 65 and a spider 66 secured to a sleeve sliding on a tube 55, the lower end of which co-operates with the valve seat 65 and which tube houses a rod 56 having a cut-away portion co-operating with an aperture 70 in the tube.  The rod and tube can be relatively rotated to vary the speed of flow of oil, a scale 60 and pointer 61 indicating the adjustment.  The rod has a weight 74 secured to it and the tube has a collar 75 co-operating with the lever 141.  In operation, a lug 156 carried by the closure lifts the weight 74, oil passing freely to the lower side of the piston as this rises.  When the work has been changed and the lug 156 has left the weight 74, this commences to descend at a rate determined by the adjustment of the pointer 61.  When the collar 75 reaches the lever 141, the valve is reversed and the closure 12 is raised.  The play between the rod 56 and the tube 55 is determined by a nut 68.