Morris, Arnold M.; Trivedi, Jitendra K.;

Elevator system

A traction elevator system including elevator ropes, and hitch plates for terminating the elevator ropes. At least one of the hitch plates includes first and second vertically spaced, aligned support levels, with the rope terminations defining first and second complementary patterns, respectively, selected to reduce the maximum fleet angle by providing components thereof in the axial direction, with respect to the sheave axis, and transverse thereto, and by reducing the cross-sectional area occupied by the ropes at the hitch plate.

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We claim as our invention:

1. A traction elevator system, comprising:

first and second movable components including an elevator car and a counterweight each mounted for guided, vertical movement between predetermined travel limits,

drive means for said first and second movable components, including first and second hitch plate means associated with said first and second movable components, respectively, for terminating the plurality of ropes,

at least one of said first and second hitch plate means including upper and lower, vertically spaced support plate members and rope termination means distributed substantially equally between said support plate members to reduce the maximum fleet angle as the associated movable component travels between its limits,

said upper and lower plate members each having horizontally oriented, major, flat surfaces,

said upper plate member being disposed directly above the lower, with their facing flat surfaces being in parallel planes, said upper and lower plate members being rigidly spaced to provide a fixed dimension between them,

each of said rope termination means including a rope socket, a shackle rod connected to each rope socket, and a shackle spring disposed about each shackle rod, with the shackle spring being a compression spring, co-acting with a flat major surface of a support plate member,

each of said first and second plate members cooperating with predetermined rope termination means to provide two spaced rope termination levels, with the shackle rods of a predetermined termination level proceeding through openings disposed in the plate member associated with the other termination level,

the ropes of the two termination levels being disposed such that the shackle rods are interleaved on one of the levels with a predetermined pattern in which a rod from one level is closer to a rod from the other level than it is to another rod from its same termination level.

2. The traction elevator system of claim 1 wherein the openings in the support plate members include low friction guide bushings.

3. The traction elevator system of claim 1 wherein each support plate member includes openings having low friction guide bushings through which the shackle rods extend.

4. The traction elevator system of claim 1 wherein the rope termination means associated with the upper and lower support plate members are arranged in first and second different complementary patterns each having a plurality of rows, with the patterns being selected to reduce the fleet angle by reducing the cross-sectional area occupied by the ropes at the hitch plate means, and by distributing at least certain of the rope angles both axially, with reference to the axis of the sheave on the at least one movable component, and in a direction transverse to said axis.

5. The traction elevator system of claim 4 wherein each pattern or rope terminations defines a rectangular configuration aligned on common geometrical centers, but with their longest sides being transverse to one another.

6. The traction elevator system of claim 5 wherein one of the rectangular configurations additionally includes a rope termination disposed at the common geometrical center.

7. The traction elevator system of claim 1 wherein the means for roping the movable components ropes at least one of them 2:1, including a sheave on said at least one movable component and a dead-end hitch plate, with the at least one hitch plate means being said dead-end hitch plate.

8. The traction elevator system of claim 1 wherein the means for roping the movable components ropes at least one of them 1:1, including a hitch plate on said at least one movable component, with the hitch plate means being the hitch plate on said at least one movable component.