Patent GB-799406-A (GB)
Title: Improvements relating to receiver devices for remote control installations
IPC: H02J13/00
Filed: 1955-11-25
Abstract: 799,406. Actuation of switches; snap-action switches; electrically-released switches. ZELLWEGER, Ltd., FACTORIES FOR APPARATUS & MACHINES, USTER. Nov. 25, 1955 [Nov. 27, 1954], No. 33892/55. Class 38 (5). [Also in Group XXXVIII] A selector switching device or " receiver " for a remote control installation operating on the impulse-interval system has an impulse receiving circuit containing a relay which on receipt of a first or " starting " impulse starts a synchronous motor which drives a control drum through one revolution, the motor being located within the drum. The drum carries adjustable switch-operating pins which are deflected into a " switching-on " position if further impulses are received by the relay whilst the drum is rotating. An audiofrequency starting impulse charges a storage condenser 210 from terminals 201, 202 over a band-pass filter 203 ... 206, the coils 203, 204, of which act as a transformer. When the condenser is fully charged, a glow-discharge tube 213 breaks down and an impulse is applied to a relay coil 214, the armature 216 of which is attracted to unlatch a lever 218 which is swung clockwise about a pivot 234 by a spring 219. Contacts 221, 223 and 222, 223 are closed to respectively shunt the condenser 210 and start the motor 225 which drives the drum 227 through gearing 226. Lever 218 and contact 223 have projections 229, 230 which ride up the teeth 301, 302, &c. of the drum so that the lever 218 is again latched by the armature 216. When projections 229, 230 drop into the spaces between the teeth, contacts 221, 223 are opened, but 222, 223 remain closed. The drum 227 carries three selector rings 251, 252, 253 each with a spring ring 261, 262, 263 attached thereto, and each spring ring carries a pin 271, 272, 273 which is biased to the left, Fig. 3, against the side of the appropriate ring 251, 252, 253 by the spring ring. The rings 251, 252, 253, with the pins, are adjustable around the drum and are held in position by spring detents 255 engaging notches 414 &c. in the drum. Each pin is arranged to actuate a separate switch 241, 242, 243 (only the latter being shown), each of which switches has a switching-on lever 268 and a switching-off lever 284 arranged on either side of a fixed partition 257. When an impulse is received and the lever 218 is unlatched, projections 281, 282, 283 thereon are moved towards the drum so that they are engaged by the appropriate pin, which pin is therefore deflected to the right (Fig. 3) by the sloping edge of the projection 281, 282 or 283. When in the normal lefthand position, the pins pass to the left of partitions 257, but when so deflected they pass to the right thereof. Thus the switching-on lever 268 of the appropriate switch is engaged and the switch is moved " on." When the lever 218 is relatched, the projections 281, 282, 283 move away from the drum. The arrangement described is such that one or more of the switches are moved " on " when an impulse is received and moved " off " or left " off " when no impulse is received, but may be reversed so that the switches are moved " off " when an impulse is received. The relay 214 may be energized directly by the impulses instead of via the condenser 210. Each switch comprises two fixed contacts 244, 245, Fig. 5, and a moving contact 246 on an arm 248 pivoted at 249, the arm 248 being connected to lever 284 by a C-spring 266. The " on " lever 268 is pivoted at 269 and has an arm 270 engaging a pin 274 on lever 284 which is thus moved clockwise when lever 268 is moved anti-clockwise to the Fig. 5 position. The portion 267 of lever 284 extends through the front of the casing 247 to serve as an indicator and to enable the switch to be manually actuated.