Patent GB-297801-A (GB)
Title: Improvement in elevator system
IPC: B66B1/52
Filed: 1928-09-28
Abstract: 297,801. Waygood-Otis, Ltd., (Assignees of Dunn, E. L.). Sept. 28, 1927, [Convention date]. Electric push-button systems. - In a pushbutton lift system it is arranged that when several calls are made at approximately the same time during upward travel the lift will stop in response to the pressing of all up floor buttons at the floors in succession at which buttons have been pressed without regard to the order in which the buttons have been pressed, and in response to the pressing of a down floor button provided that no buttons remain unresponded to for floors above the floor at which this down floor button is pressed. The system acts in a similar manner during downward travel of the lift. When the lift is travelling in a certain direction, if a floor button for that direction is pressed after the lift has passed the point at which the stop is initiated for the floor at which the button is situated, the lift will reverse after its last stop in that direction and will stop at the floor while travelling in the opposite direction provided that no buttons have been pushed for floors beyond that floor, and in the event of such buttons being pushed, will reverse again after its last stop in the opposite direction and proceed to that floor where it is stopped. Preference as to the starting of the lift and establishing its direction of travel is given to a passenger in the lift over an intending passenger at a floor for a predetermined time interval after the gate has been closed if when the passenger entered the. lift there were no calls to be responded to. The direction of travel of the lift may be reversed at any floor or only at the terminal floors. When the lift is loaded to its normal capacity it will run past floors at which otherwise it would stop. to pick up intending passengers. A direction indicator is provided in the lift for advising intending passengers as to the direction of travel. The system is described as applied to a building having five floors. The hoisting motor 23, Fig. 1, is controlled by electromagnetic switches mounted on the control panel 1. The direction of travel of the lift and the stops are controlled by a floor controller 310, and a motor 44 is provided for controlling the locking and unlocking of the well doors. An up push-button (hot shown) is provided at the bottom floor, a down push-button D5 is provided at the fifth floor, and up and down push buttons D4, U4. &c. are provided at the intermediate floors. These buttons are referred to as floor buttons and cause (1) starting of the lift in a direction determined by the floor controller and (2) the floor controller to stop the lift at the floors. Push buttons L1 - - L5 having similar functions are mounted in the lift and are referred to as lift buttons. The floor buttons and lift buttons act through floor switches mounted on the panel 2. The floor controller has a vertical threaded shaft 336, Fig. 3, mounted in it which is rotated by steel tapes 335, 336 attached to the lift. A crosshead 334 is mounted on the threaded part of the shaft 326 and is constrained by guides so that it is moved vertically without rotation. The pawl magnet 357 and the pawl switches 358, 360, 361 for controlling the slowing down and stopping of the lift are carried by a bracket 356 formed on a part of the crosshead. The switches open in the order 360, 361, 358 and are referred to as the pawl first slow down switch, the pawl second slow down switch, and the pawl stop switch, respectively. Each switch comprises a stationary contact 362, Fig. 7, adjustably mounted in an insulating plate 364, and a movable contact 363. The movable contacts are slidably mounted in apertures in the outer ends of levers 372, 373, 374, of which the lever 372 is for the pawl first slow down switch, the lever 373 is for the pawl second slow down switch, and the lever 374 for the pawl stop switch. A spring 383 presses a movable contact into engagement with its stationary contact when the switch is closed. The levers 372, 373, 374 are mounted on a shaft 384. The contact arm of the lever 372 is enlarged below the movable contact to form an opening 387, Fig. 8, and this opening is continued through the arms 390, 391 which extend at right angles to the contact arm. The end of the arm 390 is formed as a weight 392, and lugs 394, 395 are formed on the sides of the arm 391. Each of the levers 373, 374 is formed with an arm 396 which extends outwardly from the pivot point and is enlarged to form a weight 399. An adjustable abutment screw 398 is mounted in a lug depending from the inner end of the arm 396 on the lever 374, and is in the path of movement of the lug 394. The abutment screw on the lever 373 is in the path of the lug 395. The lever 372 has an adjustable abutment screw 400 which engages the bracket 356 when the switch is dosed. The armature 411 of the pawl magnet is mounted on the shaft 384 and is moved into unattracted position when the coil is de-energized by its unbalanced weight and a spring 421. A lever 424 mounted on the shaft 384 within the opening 387 in the lever 372 is formed with two spaced upwardly extending arms 425, 426 and two spaced downwardly extending arms 427, 428. Shafts 431, 433 are mounted in the ends of these arms and have centrally disposed apertures which slidably receive the inner ends of links 434, 435. The outer ends of these links are enlarged and formed with slots in which are pivotally mounted pawls 195, 242. These pawls are also pivotally connected to the arms 391, 390 of the lever 372. When the pawls are extended they engage collars 196 mounted on standards 314, 315, and as the movement of the crosshead continues, the arms 390, 391 and the lever 372 are rocked, and the first slow down switch is opened. As the arms 390, &c. continue to turn, first the lag 395 engages the abutment screw of the operating lever of the second slow-down switch, and secondly the lug 394 engages the abutment screw of the stop switch, thereby opening these switches in succession, and stopping the lift. The pawls are withdrawn from operative engagement with the stopping collars 196 when the magnet coil 100 is energized again. Bars 462, Fig. 2, are arranged between standards 312, 313 to form mountings for the floor controller stationary contacts which are arranged in columns 466, 467, 468. The contacts in column 466 are used in initiating the stopping of the lift in response to the pressing of up floor buttons for the intermediate floor and the floor button for the top floor. The contacts in column 467 are used similarly in connection with the down floor buttons, and the contacts in column 468 are used in initiating the stopping of the lift in response to lift buttons. Brushes 97, 98, 99, 227. 228, 234 for engaging the stationary contacts are mounted on an insulating panel 471 connected to the crosshead. Brushes 97, 98, 99 co-operate with the stop contacts to initiate the stopping of the lift when travelling in the up direction, and the brushes 227, 228, 234 function when the lift is travelling downwards. Each brush comprises a contact piece 474, Fig. 3, mounted on a lever 475 pivoted at 477 in a bracket adjust ably mounted on the panel 471. A spring 485 maintains the brush in extended position with its inwardly bent lower end in contact with the bracket. Additional brushes and columns of contacts may be provided for con. trolling other circuits, e.g. for lights or magnetic door locks. Direction switches such as 229 are mounted on each bar 462 for determining the direction of travel. Each switch comprises a brush contact arm 488 pivoted at 492 in a bracket on the bar. A switch lever 493 is connected by a pivot 494 to the arm 488 and its upper end 495 co-operates with a stationary contact.496. A spring 498 normally maintains these contacts in engagement. The brush contact arms are engaged by a cam 502 composed of three spaced sections, viz. up direction cam section 84, down section 220, and centre direction cam section 272, Fig. 2. The sections 84, 220 are provided with binding nuts for connection in the system. The. centre section is insulated from the others and is not connected in the system. Lugs 506, 507 formed on the bracket for the brushes 97, 284 carry rollers 194, 241 of insulating material which lift the brush contact arms of the direction switches off the cam sections 84, 220. The direction cam is so connected in the circuit that it causes the direction switches for floors above the floor at which the lift is stopped to be in an up circuit, and for floors below to be in a down circuit. The floor controller also is provided with mechanism for ensuring preference being given to lift buttons over floor buttons in starting the lift. This mechanism comprises a switch 246 for each intermediate floor of the same construction as the direction switches and an actuating cam 269 mounted on the crosshead. The cam is so positioned on the panel that with the lift at rest at an intermediate floor, it engages the brush contact arm of the lift preference, switch for that floor, and causes this switch to be open. Flexible conductors connect the various electrical parts to binding posts on a panel 515. Each of the floor switches, Figs. 11 and 12, mounted on the panel 2, or on the panel 515, comprises a pair of stationary contacts 72, 74 and a'pair of movable contacts 73, 75. The contacts 72, 73 control the stopping of the lift, and the contacts 74, 75 control the starting and running of the lift. A contact arm 525 rotatably mounted on a pin 526 carried by a bracket 522 on the panel is formed with an aperture 531 through which passes a pin 528. The head of the pin is received in a recess in the panel, and a spring 540 urges the arm 525 against a pin 532 passed through the end of the pin. The upper end of the arm is inclined at 533 and formed as a hook at 534. A contact blade 537 is mounted on the pin 528. The contacts are moved to engaged posit