Patent GB-190411121-A (GB)
Title: Improvements in Means of Electrically Controlling the Movements of a Cage Working in a Lift or Hoist or of a Car Travelling on an Inclined or other Railway.
Inventor: MOORE ERNEST SHERWOOD WOOLLARD
Filed: 1904-05-14
Granted: 1905-04-13
Abstract: 11,121. Moore, E. S. W., and Bennitt, W. B. May 14. Motors, controlling.-Relates to the electric control of lifts and cars travelling on inclined and other railways by push-buttons on the car or cage at the stopping-places and at a central station, and comprises means for bringing the car to rest at the next station, if not already too near, upon the operation of an emergency switch. The arrangement is such that the disposition of the car and the push-button pressed in causes one of two levers to fall and rotate a spindle in a direction to start the motor, so that the required motion of the lift may take place. Contacts b<3>, d<2> arranged on an extension of the spindle J engage fixed contacts when the lift is at rest. If it is required to move the car to the terminal station corresponding to the push-button A, that button is pressed in, and a circuit is completed through a magnet D, the armature of which causes the release of a catch f holding up an arm F and the fall of a lever H riding loosely on the spindle J. A pivoted pawl p is carried with this lever in curved guides whereby it is tilted and engages an arm N keyed to the spindle J. The lever H moves an arm h, which displaces a detent j<1> normally retaining the arm N by depressing the incline j. Rotation of the spindle J takes place, and the motor starts, and the contacts b<3>, d<2> are replaced by contacts e<2>, f<2>. This causes short-circuiting of the magnet D, and puts a hold-on magnet R in circuit through a resistance W. The latter causes the catches t, s to hold the arm N in position. A disc E deriving motion from the motor has projections T<1> with inclines g<2> which raise the arm F and lever H when the lift moves ; these are now held up by the catch f, owing to short-circuiting of the magnet D. Considerable tension is thus put upon a spring k<1>, so that, when the hold-on magnet R is short-circuited by a contact m<1> on the disc T engaging yieldingly-supported contacts n<1> when the lift reaches the end of its travel, and the catches s, t are disengaged, the arm N returns to its central or 'off' position. To bring the lift to the floor A<3>, the other releasing-magnet D' is energized through the contact-plate C'. To bring the lift to an intermediate floor, the corresponding button being pressed in, current passes from fingers o' by slip-rings r<1> to two tripping-magnets U arranged around the disc T, one magnet U only being shown in Fig. 6, the return current passing through a common slip-ring r<2> and finger o<2>. This causes a finger v<2> to make contact with either of the plates C, C', so as to complete a circuit through the corresponding releasing-magnet D, D<1> and to release one or other of the arms H, H<1> according to the disposition of the lift and the button pushed. The contacts C, C' are fixed in circular arcs around the axis of the disc T with an interposed strip v. The spindle J having been turned in the required direction, the various operations are as before, excepting that the magnet U continues energized by the finger v<1> coming into contact with the plate v. Connected also to the finger v<1> and the armature of the electromagnet U are contacts w<1>, w<2>, one for each direction of the lift, which are pushed out and short-circuit the hold-on magnets R, R', when the lift arrives at its destination, by meeting the fixed contacts n'. Double inclines g<1> are provided to raise the arms H, H<1> whatever be the direction of motion of the lift and disc T. A rod s<2> connecting the catches f ensures that the rods F, F<1> shall not fall simultaneously. On closing the emergency switch B', which is maintained closed by an electromagnet g<2>, current passes from a fixed contact j<3> to the spring finger q<3> of the tripping-electromagnet U which is just coming into position, thus pushing out the contacts w<1>, w<2> and allowing the spindle to reassume its central position. The contact j<2> is made with two bearing-surfaces j<3>, so that only that contact w<1> or w<2> corresponding to the direction of motion of the lift may engage the fixed contacts n<1>. Arrangements are also described for stopping the car at any point and for raising the arms H, H' by a solenoid.