Patent GB-385804-A (GB)
Title: Improvements in or relating to weighing scales
IPC: G01G13/30
Filed: 1932-03-24
Abstract: 385,804. Electric signalling systems. DAYTON SCALE CO., 468, Huffman Avenue, Dayton, Ohio, U.S.A.-(Assignees of Pein, E. J. von ; -335, Watervliet Avenue, and Showalter, F. ; 34, South June Street, both in Dayton, Ohio, U.S.A.) March 24, 1932, No. 8826. Convention date, March 30, 1931. [Class 40 (i).] A weighing scale comprises auxiliary mechanism (such as indicating and recording mechanism) controlled in accordance with the position of a load-responsive element positioned by the load, and a control for the auxiliary mechanism embodying electrical circuits and a translator, the translator providing for the jumping of a spark or sparks between the load-responsive element and 'the translator and directing the same through the circuits for controlling the auxiliary mechanism. The indicating pointer 14, Fig. 2, carries an insulated strip 32 which moves in close proximity to an insulated conducting ring 29 and to the ends of a number of radial bars 28, one bar being provided for each pound graduation on the dial. Behind the bars 28 are a series of conducting rings 24 covered by a perforated sheet 25 of mica. In a weighing scale having a weighing capacity of 500 lbs. the outer four of the rings 24 represent readings in the hundreds denominations, viz. : 400 .. 100 ; the next nine -rings represent the tens denominations, viz. : 10 .. 90, and the innermost rings the units 1 . . 9. When the operator closes a switch a high tension circuit from an induction coil is established through the ring 29, strip 32, adjacent bar 28, a selection of the rings 24 corresponding to the selected bar 28, and electromagnets associated therewith so as to energize low-tension recorder magnets controlling differential pawls as described below, the spark gaps at the strip 32 bar 28, and rings 24 being jumped by the high tension current. In a modification where three induction coils are used corresponding to the three denominations of weight a contact strip vibrated by movement of the fluid in a dashpot connected'to the weighing, mechanism causes energization of a solenoid the core of which opens the primary circuits of the induction coils and thereby prevents an indicating and recording operation being initiated before the weighing mechanism has come to rest. The circuits are arranged to operate independently of the order in which spark gaps of the three denominations are jumped. In a further arrangement, the operative spark gaps of the denominations are jumped successively in predetermined order, viz., units, tens and hundreds, under the control of a rotary cam which closes and opens the primary of the induction coil, and of a rotating distributer controlling the high tension circuits through the rings 24, both the cam and the distributer being rotated by the movement of a solenoid core. The indicating and recording devices comprise a bank of recorder magnets for each of the three denominations, one electromagnet being provided for each of the rings 24. In Fig. 18 is shown one bank of recorder magnets 50 with the differential pawls 142 referred to above, for one of the denominations, vii., tens or units, the arrangement being similar for the hundreds denomination except that four recorder magnets are required instead of the nine shown. When the operator closes the switch and (as described above) energizes one of the recorder magnets 50, the selected. magnet attracts the corresponding differential pawl 142 into the path of the teeth 145 of a member 146 provided with a rack 147 meshing with a pinion 148 attached to a weightindicating disc 178. The movement of the switch also locks the differential pawls in set position and liberates a shaft 140 thereby permitting the operator to rotate the same by means of an operating handle 172 and to rotate resiliently the toothed member 146 into contact with the displaced differential pawl. The movement permitted to the toothed member represents the digit in the denomination concerned and is transferred by the pinion 148 to the corresponding indicating disc 178. In a modification of the arrangement shown in Fig. 2, the plurality of bars 28 is replaced by a single radial bar attached to the insulated strip 32 and arranged to move close to the perforated mica disc 25. Recording apparatus. - The readings of the weight-indicating discs are permanently recorded by perforating mechanism, shown in Fig. 16, which punches a tabulating card 186 according to the Hollerith system. On the shaft of each indicating wheel is a pinion 190 gearing with an interposer bar 188 which is thus moved over the punches 180 so as to hold down the requisite punch when a frame 182 holding the card is moved upwardly by a cam lever 195 actuated from the shaft 140. of the operating handle. Specification 281,220, [Class 143, Weighing-apparatus], is referred to.