Patent GB-190005206-A (GB)
Title: Safety Locking and Releasing Apparatus for Various Parts of Lifts.
Inventor: WALKER HENRY CLAUDE
Filed: 1900-03-19
Granted: 1901-02-09
Abstract: 5206. Walker, H. C., and Hildred, C. W. March 19. Lifts, cage. Relates (1) to apparatus for automatically unlocking and locking well doors or gates upon the arrival and departure of the cage ; and (2) to apparatus for automatically locking the handing-rope or other operating-apparatus during the time a well door is open. Fig. 1 shows a front view of a rigid sliding gate fitted with balance weights c. When the cage is not at the floor, the door is locked down by a spring lever e, which bears against a stop a<1> on the gate. As the cage arrives, a striker upon it strikes and presses inwards the upper end e<5> of the lever e, thus disengaging the lower end and leaving the gate free. As the gate is raised, it pushes a spring catch e<2> on the lever e to one side, until a stop a<2> has passed above it, when it engages with it and holds the gate up. As the cage leaves the floor, the spring e', coming into action, rotates the lever sufficiently to withdraw the catch e<2> from the stop a<2>, when the gate descends and closes under its own weight. To prevent shock, weights c* are threaded upon the chains c<1>. Just before the gate reaches the bottom in descending, the weights c* are picked up from cross-bars c', and these serve to check the descent. The invention is also shown in the Specification applied to gates which slide downwards to open, to vertically-collapsing gates, and to swing gates. Fig. 17 shows one form of the apparatus for locking the handing-rope. The latter passes around a drum h with a recess h<1> in its periphery, which, when the cage is at rest, comes opposite to the hooked end of a lever h<3> connected to a rod h'. A pivoted catch for securing the door g engages by its tail a collar h<5> on the rod h<4> so that, when the catch j<1> is raised by the operation of a handle i, the rod h<4> is lowered and the lever h<3> operated to lock the drum h, and heave the rope h<2>. The catch j is held up by a spring catch as long as the door g is open. Fig. 29 shows another arrangement, as seen from the interior of the cage, for locking the handing-rope. The well door g is locked by a catch n which, when the cage is away from the door, is prevented from rising by a sliding bolt l with two inwardly-projecting pins l<1>. The handing-rope h<2> passes between a fixed curved surface o<6> on the cage and a cam surface o<5> on the inner end of the pivoted cross-bar o. This cross-bar is connected by a link o<2> to a lever o<3> pivoted to the side of the cage and having a lateral flange which passes between the pins l<1> as the cage stops at the landing. When, therefore, the bar o is raised, the rope h<2> is locked, and the locking-bar l is withdrawn so as to leave the latch n free to rise. Fig. 32 shows an arrangement whereby the unlocking of the well door shuts off the pressure water in hydraulic lifts. The plunger t<2> of a cut-off valve t is pivoted to a lever t<3> connected by a link t<4> to the valve casing, and is kept in its inoperative position by a weight. A rope u<3>, fixed to the outer end of the lever t<3>, passes up the well, around pulleys u<1> and u<2> on a bell crank lever u mounted in the cage, and thence to a fixed point at the top of the well. In the position of the lever u shown in full lines, the valve t is open. When the lever is put over into the position shown in broken lines, to unlock the bar closing the well door, it shortens the effective length of the rope u<3>, raises the valve rod t<3>, and closes the valve t. In a modification, the rope passes round three pulleys on the cage, one of which is moved laterally by the door-unlocking mechanism to shut the valve t. In another modification, the lever t<3> rocks about a middle pivot, and is fitted with end pulleys round which the operating-ropes pass.