Patent GB-252122-A (GB)
Title: Improvements in or relating to electric elevator systems
IPC: B66B1/52
Filed: 1926-02-02
Abstract: 252,122. Waygood-Otis, Ltd., (Assignees of Lindquist, D. L., Dunn, E. L., and Larson, D. C.). May 13, 1925, [Convention date]. Electric plant.-In lifts particularly intended for use in department stores the lift is started in either direction by the attendant moving the switch 342, Fig. 1, to the same position. The direction of travel is determined automatically by a director switch 20 having two operative positions for up and down travel, respectively, and also an intermediate neutral position. The switch 20 is moved to neutral position when the lift approaches a terminal floor by hatchwav cams 77 and when the lift stops at the floor is moved further into the reverse position ready for the next journey by a motor 117. This motor may also be actuated at intermediate points in the travel by the attendant by means of the switch 588. The lift is stopped at any intermediate floor by turning the switch 342 to neutral position prior to the lift reaching its stopping distance from the selected floor, but the lift can be stopped at all the intermediate floors automatically by a floor stop machine 135 if this machine is put in action by a switch 430. This machine includes automatic slow down, stop and other switches for either direction of travel which are actuated by a mechanical device moved in accordance with the travel of the lift and carrying electromagnetically controlled pawls adapted to engage stops corresponding to the several floors. The switch 342 may be arranged to effect the closing and opening of the lift gate and well doors and a switch 595 may be provided for operating the lift with the gate and doors open. The director switch, Fig. 2, comprises an annular contact support 27 having arcuate slots 28, 30 in which insulating contact bases 31 are adjustably mounted. Spring contacts 33, 32 secured to these bases control the circuits for actuating the up and down direction switches and contacts 34 - - 37 control the circuits for the accelerating switches. Feed contacts 38, 40 are also mounted on the support 27. The segment 44 for bridging the contacts comprises an arcuate channel member formed of outer and inner flanged portions, connecting webs and a supporting arm. The outer flange bridges either of the set of contacts 32, 34, 35: 33, 36, 37, and the inner flange engages either of the contacts 38, 40. The supporting arm of the segment 44 is mounted on a shaft 52, Fig. 3, between insulating plates 53. 54 which are connected together and attached to the flange 61 of a sleeve 60. A pinion 65 has a dividing connection with the sleeve 60 and is driven by a segmental gear 71 mounted on a shaft 72 which carries arms 75, 78 and a segment 80. Friction plates 85, 86 mounted on the sleeve 60 co-operate with a stationary annular disc 87 to maintain the switch in any position to which it has been moved. The arm 75 carries a roller 76 for engaging the cams 77, and the arm 78 is connected by a link 81, Fig. 5, to a segmental gear 121 meshing with a pinion 120 on the shaft of the motor 117. The link 81 is made in two parts separated by a spring. Cams 98 adjustably mounted on the segment 80 engage the actuating rollers 97 of switches 95, 96 controlling the motor 117. The floor stop machine comprises a frame formed by a base 136, Fig. 9, standards 137, 138, 140, 141, and a top 142. The eight following automatic switches are provided on the top of the machine, viz. up first slow down switch 145, second slow down switch 146, stop switch 147 and door sequence switch 148, and the corresponding down switches 150 - - 153, Fig. 11. The stationary contacts 155 of the switches 145 - - 14S are mounted on an insulated plate 157. Each movable contact is mounted on a lever 161 and is connected to a corresponding binding post on the plate 157. The levers 161 . . are pivotally mounted on a pin 168 and are biased by weights 171 to maintain the switches closed. A bell-crank lever 172 pivotally mounted on the pin 168 has a T-shaped vertical arm, the cross member 174 of which is provided with lugs which engage abutment screws 175 . . mounted in the levers 161. . . The screws are so adjusted that the switches 145, 146 are opened consecutively and then the switches 147, 148 are opened simultaneously. A socket 180 pivoted to the lever 172 receives a vertical tube 182 which at its lower end is mounted in a similar socket 184 pivoted on a bell-crank lever 186 which is mounted on the base. The switches 150 - - 153 are actuated bv similar mechanism but the horizontal arms of the bell-crank levers 191, 193 extend towards the corresponding arms 172, 186. The depending arms of the lower bell-crank levers are joined by a rod 196, the end of which bears against an adjustable screw stop 197. A weight 201 on the tube 182 maintains the switch opening mechanism in the position in which the end of the rod 196 bears against the stop 197. The driving sheaves, Fig. 1, for the machine are secured to a shaft 207 which is connected by bevel gears 218, 216 to a threaded vertical shaft 214. A crosshead 224 threaded on the shaft has a forked end 222 which embraces a vertical guide bar 225. A frame 228 carried by the crosshead supports a pawl magnet comprising a coil 231 and central core 232. The magnet armatures 236, 237 are pivoted in arms 240 extending from the frame 228. The bifurcated end of an extension 241 of the armature 236 engages a sleeve 242 mounted on a pin 243 attached to the frame 228 and depressed by a spring. The amount of outward movement of the armature is limited by a screw 246. The armature 237 is constructed similarly. Pawls 248, 250 attached to the armatures engage stopping collars 251 on the tubes 182, 194. The switches 145, 150 are arranged in the circuits for the actuating coils of the second and third accelerating switches of the hoisting motor control system and the switches 146, 151 are arranged in the circuits for the actuating coil of the first accelerating switch. The automatic stop switches 147, 152 are arranged, respectively, in the circuitsfor the actuating coils of the up and down direction switches of the hoisting motor. The automatic sequence switches 148, 153 are arranged in parallel relation in the circuit for one of the coils of the door contact sequence relay. Bars 255, Fig. 10, of insulating material are supported by adjustable collars on standards 140, 141 and carry the stationary contacts of the machine arranged in two columns. The reversing contacts in the left hand column are arranged in the control circuits for the director switch 117, and the stop contacts in the other column are arranged in the control circuits for effecting the de-energization of the pawl magnet. The travelling brushes for engaging the contacts are mounted on a panel 262 secured to the crosshead frame 224. A single brush 265 is provided for engaging the reversing contacts, and two brushes 266, 267 for engaging the stop contacts. Only the brush 266 is "alive" during up motion of the lift, and only the brush 267 during the down travel. Each brush is of the same construction and comprises contact pieces 268, Fig. 13, having slots through which is passed a pivot pin 271 mounted in the frame arms. Springs 275 in recesses in the brushes abut against the pin 271. A blade 277 for centring the contact pieces is mounted loosely on a guide bushing 278 secured to the frame 270. A compression spring 283 mounted on the bushing 278 bears against the blade. A pair of limit switches 284, 285, Fig. 15, are adjustably mounted on the standard 138, and are actuated by a cam 290 secured' to the forked end 222 of the crosshead. A diagram of circuits given in the Specification shows the invention applied to a lift system having a gearless hoisting motor and variable voltage speed control, and in which the power is supplied through a motor generator set. the exciter of which also supplies current for the control circuits.