Patent GB-714775-A (GB)
Title: Improvements in or relating to counting devices
IPC: B61L1/16
Filed: 1951-10-31
Abstract: 714,775. Counting-apparatus. SIEMENS & HALSKE AKT.-GES. Oct. 31, 1951 [Jan. 6, 1949], No. 25505/51. Class 106 (1). [Also in Group XXX] In an impulse circuit arrangement for axle counters the axles to be counted actuate two impulse contacts spaced along the rails so that the sequence of their operation depends on the direction of travel of the axles, and each axle sets up an impulse series which is converted into a counting impulse, and the counting impulse acts, in dependence upon the direction of travel, either on a counting mechanism for counting-in, or on a counting mechanism for counting-out, each of which mechanisms can only be stepped forward in one direction, and the impulse circuit arrangement contains polarized relays, with the aid of which each impulse series, in which the duration of the individual impulses is dependent upon the speed of travel of the axles; is converted into a counting impulse the duration of which is independent of the speed. Contacts 1, 2, Fig. 1, are closed in the sequence 1 and 2 by an incoming axle and in the sequence 2 and 1 by an outgoing axle. The windings 10a of a polarized relay A and the winding 11 of a relay B are connected in series with the contact 1. The winding 10b of the relay A and the winding 12 of a relay C are connected in series with the contact 2. The condensers 3 and 4 are connected across the windings 11 and 12 respectively to make them slower to release. Contacts 101, 102 of the relay A are in circuit with a condenser 5, contacts 111, 112 of the relay. B. contacts 121, 122 of the relay C and the winding 13 of a polarized relay D which when energized closes one or other of two contacts 131, 132 in accordance, with the sequence of closing of the contacts 1, 2 to send an impulse to a counting-in mechanism EZ or a counting- out mechanism AZ. In operation when an incoming axle closes the contact 1 the windings 11 and 10a are energized whereupon the contacts 101, 102 are closed and the contacts 102, 111 opened so that the condenser 5 is charged through the circuit comprising the contact 101, the condenser 5 and the contacts 112, 121. When the contact 2 is closed the windings 12 and 10b are energized, because of its polarization there is no change in the position of the armature of relay A so contact 101 remains closed, energization of the winding 12 causes closing of contact 122 and opening of contact 121. When contact 1 opens the winding 10a is de-energized opening contact 101 and closing contact 102. The condenser 5 is discharged through the circuit comprising the contact 102, the condenser 5, contacts 112, 122 and the winding 13 of polarized relay D which is energized to close the contact 131 and so send an impulse to the counting-in mechanism EZ. The contact 2 is now opened and the circuit reverts to its initial position. An outgoing axle closes the contacts 2 then the contact 1 and the switching operations are similarly performed, the relays B and C interchanging their functions so that the relay winding 13 is energized by the charging current of the condenser 5 and relay D closes contact 132 to send the impulse to the counting-out mechanism AZ. The relays B and C may be made slow to release by holding windings instead of the condensers 3 and 4. Two polarized relays each having a unidirectional adjusted armature may be used instead of the polarized midposition relay D. There may be additional relays between the relay D and the contacts 131, 132, which may be kept closed by self-holding windings when the charging or discharging current of the condenser 5 has died down.