GB446109A - Improvements in or relating to locks for lift gates and the like - Google Patents

Abstract

446,109. Fastenings for lift gates. FOULDS, Ltd., E. A., and CATTERALL, H., Albert Works, Colne, Lancashire. Nov. 9, 1934, No. 32231. [Class 44] [See also Group XXX] Locking mechanism for lift gates &c. comprises a member the position of which is changed by the initial operation of the stopping and starting gear, and a rotary gate holding member the position of which is changed by the final closing and initial opening of the gate, but is held against rotation by an obstruction member when the lift is not stopped at a floor, the rotary member itself preventing the obstruction member from disengaging the starting mechanism when the gate is open. A gate can consequently only be opened when the lift is stopped at a floor and the lift cannot be started unless all the gates are closed. A casing a on the gate opening has a slot a<1> to admit the end of a catch bl on a sliding gate b and as the gate is closed the catch engages between teeth on a member c and turns it from the position shown in full lines to that shown in dotted lines. A rod i connected to the lift control cable is slidably mounted in the casing and has a V-notch i<1> to accommodate the enlarged end e<1> of a lever e loosely mounted on a spindle f. The lever e is connected by a spring h<1> and pin h to a lever g fixed on the spindle f and having an extension g<1> acted upon by a spring g<2> which urges the lever g, and with it the lever e, towards the position shown in chain lines where it engages beneath a projection c<3> on the member c when the gate is closed and prevents re-opening of the gate. The spindle f carries a second lever, not shown, carrying a roller jl adapted to be engaged by a ramp on the cage to move the lever e out of engagement with the projection c<3>, but unless the rod i is in the lift-stopped position so that the enlarged end e<1> of the lever e can enter the notch i the lever e is not moved, the spring h<1> merely being compressed. When the lift is stopped and the gate is open the member c prevents the lever e from being moved into the position shown in chain lines and consequently the rod i cannot be moved to start the lift. The rods i at each floor of the lift shaft may be connected by links l, Fig. 3, to a bell-crank lever m which is linked to a bell-crank lever n acted upon by a cam o on a pulley d. The control cables p are passed around this pulley and around tensioning pulleys q. The cable also passes around a pulley r having a cam s acting upon the lift control lever t<1>, the cam being so formed that the lift is only started or stopped when all of the rods i have been moved. The locking members may be duplicated on the opposite end of the lift, as shown, when gates are provided at each end of the lift.