Patent GB-627204-A (GB)
Title: Improvements in controlling means
IPC: G05D16/16
Filed: 1947-02-04
Abstract: 627,204. Gauges. FAIRWEATHER, H. G. C. (Sandvikens Jernverks Aktiebolag). Feb. 4, 1947, No. 17321/44. [A Specification was laid open to inspection under Sect. 91 of the Acts, March 25, 1945.] [Class 106 (ii)] [Also in Group XXIX] A control and/or measuring apparatus comprises an indicating, recording or controlling device adapted to be operated by a pressure difference between two bellows 25, 26 controlled by_ a multiple valve 2. Pressure air is supplied through inlet ports in the valve to the bellows while air escapes through outlet ports also in the valve in known manner, the outlet ports of the valve being characterised by being adjustable as by screwing relatively to the body of the valve. The Specification as open to inspection under Sect. 91 also includes the following subjectmatter. In Fig. 5 (Cancelled), compressed air is fed to a chamber 37 maintained at constant pressure under the control of a bellows 31, lever 41 and blow-off valve 42. The chamber 37 feeds air to chambers 6, 7 through small nozzles 8, 9, outlet nozzles 10, 11 being masked to a greater or less extent by valves 12, 13 carried by a member 45, rockable by a spring- pressed feeler 60 on contact with the workpiece being gauged. Movement of the member 45 from the neutral position throttles one nozzle 10, 11 more than the other so that pressure in one chamber 6, 7 increases while pressure in the other decreases. The chambers 6, 7 communicate with the outside and inside, respectively, of a capsule 71 which therefore responds to the pressure difference which is indicated by a pointer 84. The sensitiveness of the device can be varied by moving the member 45 towards or away from the nozzles under the control of a micrometer screw 54, the adjustment of which is indicated on a scale 56. The valve 13 is adjustable through an aperture 47. In the modification (Figs. 6, 7, both Cancelled and not shown), the outlet nozzles are adjacent and at an angle and the feeler rocks a wedge-shaped lever towards one nozzle or the other. In Fig. 9 (Cancelled), the pressure in the constant-pressure chamber 142 is adjustable according to the amount of fluid pumped into a bellows 143, and the chambers 130, 131, corresponding to the chambers 6, 7 in Fig. 5 (Cancelled), communicate with separate bellows 127, 128, acting differentially through a lever system on a pointer 122. The outlet from chamber 131 is adjusted by a feeler 133 contacting the workpiece but the outlet from chamber 130 is controlled by an arm 135 manually adjustable between stops 136, 137. The several bellows may be partially filled with wood so as to have a quick response. In Fig. 14 (Cancelled), the movement to be measured or controlled actuates a feeler 227 to affect bellows 212, 213 which rock arms 217, 218 to affect a like pressure system, whereby the movement is multiplied twice. The pressure of the supply to the chambers 205, 206 is adjustable by a conical throttle valve 228 controlled by a hand-wheel 229. In the case when only one outlet is affected by the quantity to be measured or regulated, the corresponding bellows may rock a shaft 232, Fig. 15 (Cancelled), and via levers 234, 235 displace a valve 239 opposite the outlet 241 of the other chamber 240, whereupon the second bellows 260 reacts to increase the effect of the first bellows on the rock-shaft 232, which operates indicating or regulating mechanism. The apparatus may include recording mechanism operated by a chopper bar or by electric sparking. Indicating mechanism, for use with the apparatus, may comprise a wide-angle U-tube manometer in which deviation from the neutral position closes electric circuits. The apparatus is applicable to the testing of nozzles against a standard nozzle, the continuous gauging and/or controlling of sheet material, or for measuring round or irregular shaped object by having a slit nozzle of the desired form. This subjectmatter does not appear in the Specification as accepted.