Patent GB-764638-A (GB)
Title: Improvements in remote indicating apparatus for meters
IPC: G01F15/06
Filed: 1955-02-03
Abstract: 764,638. Counting-apparatus. SANGAMO WESTON, Ltd. Feb. 3, 1955 [heb. 3, 1954], No. 3243/55. Class 106 (1). [Also in Group XXIV] A remote indicating- mechanism for a meter comprises an indicating register situated remotely from the meter and operatively connected to the meter through a gaseous fluid pulse - transmission system, said system comprising a pulse receiver arranged to operate said indicating register and connected by a fluid conduit to a diaphragm type fluid pulse transmitter at the meter. the upper part 15, Fig. 1, of the casing 10 of a conventional form of gas meter contains the flag rods 18, 19 which are oscillated by the bellows (not shown) at a rate proportional to the rate of gas flow and connected through a crank 26, a shaft 27, a worm 29a, Fig. 2, a worm-wheel 31, gears 45, 47, 48, 51, 52 to a snail cam 55 which co-operates with a cam following roller 61 carried by a U-shaped actuating head 62 screwed to a horizontal diaphragm 64 clamped by screws between the flange 102 of a cover 101 and a ring 103 above the inlet channel 17. The central part of the diaphragm is reinforced by metal discs 107, 108. The roller 61 is mounted on the end of a link 68 which passes through holes in the limbs of the U-shaped member 62, the other end 74, Fig. 3, of the link 68, being supported between a frame plate 41 and a bracket 84. A pin 71 Fig. 2, extends between the limbs of the U- shaped member 62 and a pin 73 is removably supported between the frame plate 41 and the bracket 84 above the end 74 of the link 68. A link 67 extends parallel to the link 68 and is notched at its ends to engage the pins 71, 73. A tension-spring 77 keeps the roller 61 against the cam 55. A spring closed valve 111 opens into the upper part of the diaphragm chamber so that as the roller 61 reaches the top of the cam 55 the valve 111 is opened to admit gas from the chamber 15 into the diaphragm chamber 65 and as the roller 61 drops a suction pulse is transmitted via the tubing 125, 131, Fig. 5, to the receiver 150 comprising a dial plate 151 and a counter including pointers 152 interconnected by transfer mechanism. The tubing 131 leads to a chamber 158 containing a diaphragm 164 clamped between the edge of a plate 161 and a ring 163. The receiver mechanism and glass cover unit is attached by a sealing band 176 to a mounting cup 170 held by screws 172 to a supporting wall 173. A sealing band 179 clamps the glass cover 156 to the plate 161. Cups 187, 187a attached to the diaphragm 164 carry a spindle 188 which is connected to a lever 189 pivoted at 190 and carrying a pawl 192 formed by a flexible strip of metal having a rectangular opening 195 through which project the teeth of a ratchet 193 connected through gearing to the first pointer 152 of the counter. As the diaphragm 164 flexes inwardly the pawl 192 steps on the ratchet 193 which is prevented from reverse movement by a detent pawl 197 similar to the pawl 192. In a modification where air is used as the transmission medium the valve 111 at the top of the diaphragm chamber 65 is completely enclosed by a cover, the enclosure being connected by tubing to the atmospheric exterior of the meter. The diaphragm of the receiver is spring-biased to return to a normal position.