Patent GB-342665-A (GB)
Title: Improvements in and relating to automatic station-indicating and advertising apparatus
IPC: B61D41/00
Filed: 1929-07-23
Abstract: 342,665. Advertising or station-indicating apparatus. DOCKAL, A., Hodolany, Czecho-Slovakia. July 23, 1929, No. 22654. Convention date, June 14. [Class 3 (i).] An automatic advertising or station-indicating apparatus comprises an indicating band box detachably connected to a driving box such that the former may be removed in a direction at rightangles to a shaft connecting the guide roller with the driving box, the coupling in this shaft comprising pins on one member engaging a diametral slot in the other member, this slot being horizontal whenever an inscription on the band registers with the corresponding aperture in which position the switching mechanism is positioned to stop the motor driving the indicating band rollers. The motor 24 in the driving box 2 drives through gearing 38, a shaft 29, and by means of a coupling, comprising a disc 31 pins 57 on which engage holes 58 in a disc 30, a shaft 32 adapted to drive by means of belts 33, 34 either of rollers 35 or 36. The indicating band 4, Fig. 5, is wound on these rollers and passes over guide rollers 41, 41<1>, the former of which is mounted on a shaft 42 coupled at 44, 45 to the shaft 43. To remove the indicating band box 2 an arm 49, Fig. 5, is rocked to turn a spindle 154 carrying an arm 48, a finger on the end of which presses back the disc 30 against the action of a spring 141, the disc 30 in its retracted position being held by a catch 51 mounted on a rocking lever 52. The box 2 may now be removed at right angles to the shaft 42, the pins 47 of the member 45 sliding along the slot 46 of the member 44 the slot 46 being horizontal when the apparatus is normally indicating. Operation. When the display is to be changed contacts 28 are closed momentarily, either manually or by a ramp on the track, as when the apparatus is used on a vehicle for example a tram or train. When used for advertising these contacts may be periodically closed by a clockwork mechanism. A magnet 7 is energized, its armature 8 rocking a pivoted lever 9 against the action of springs 26, 27 until held by the recess 16, Fig. 2, in the sprung snap 11 pivoted at 12, the extension 20 of the lever 9 now being retracted from a slot 18 in a disc 15 fixed to the spindle 43. When the contacts 25 are opened to release the magnet 7, the motor 24 is energized over contacts 21, 25 and drives through the shafts 29, 32 the belt 34 and hence the roller 36, the belt 33 running on a loose pulley 37. The shaft 42 being driven frictionally by the band, the raised portion 19 of the disc 15 engages the bent end 17 of the snap 11 whereupon the lever 9 assumes an intermediate position, abutting against the cam face 15, until the shaft 42 has nearly completed a revolution when the extension 20 falls; into the slot 18, the motor circuit being interrupted at contacts 21, a lamp 98 being now illuminated over contacts 96 to indicate that the change in display has been effected. The slot 46 in the coupling 44, 45, being parallel to the diameter of the disc 15 containing the rise 19 and the slot 18 is thus always horizontal when at rest. When the band 4 has completely unwound from one of the rollers, spring contacts mounted in the vacant roller close, to energize a magnet 70 the armature of which causes a tooth 75 normally engaging a notch 76 in a slide 76 to release the latter, which, under the action of a spring 78 assumes the position shown in Fig. 1. A cam 79 will now on the rotation of shaft 29 engage the slide 77 to depress a sprung member 80, which, by means of a lever 81, 84 will move a sprung bolt 85 to the right, the latter being held in this position by a lever 89 engaging a tooth 90. A member 91 will at the same time so move the shaft 32 laterally that the drive is transferred from one indicating band roller to the other. During the following rotation of the shaft 29 a cam 92 thereon will move the slide 77 to the left so that the catch 75 again engages the notch 76. When the band is completely re-wound on the other roller, contacts in the now vacant roller may energize a relay to release the lever 89 allowing the bolt 85 to move under spring action to the left to again reverse the drive. An alternative method of reversing the drive is by means of a reversing switch operated by two relays selectively energized at the terminal positions of the indicating band, the switch reversing the direction of rotation of the motor 24. In this case both belts 33, 34 are positively driven, one way couplings being provided on the winding rollers 35 and 36. Each roller drives a pulley 94, Fig. 7, integral with a cam 131, Fig. 8, a cylindrical member 127 fixed to a roller shaft, 351 say, being driven frictionally by the balls 128 .. 130, when the cam 131 is rotated as indicated by the arrow. When the cam 131 rotates in the opposite direction the balls are forced against and held by the shaped edges of a member 133 held against lateral movement by a sprung disc 136 and bolted to a plate 134 free on the shaft 35<1> so that the latter is free to rotate in either direction.