Load bearing traction members and method

Patent metadata

Field	Value
Publication number	US-11548763-B2
Application number	US-201816101097-A
Country	US
Kind code	B2
Filing date	Aug 10, 2018
Priority date	Aug 10, 2018
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

A lifting member for an elevator system is disclosed, including a rope formed from a plurality of strands comprising liquid crystal polymer fibers, with the strands extending along a length of the lifting member. A first polymer coating is disposed on outer surfaces of the fibers or on outer surfaces of the strands. A second polymer coating disposed over the first polymer coating.

First claim

What is claimed is:

1. A lifting member for an elevator system, comprising
a rope formed from a plurality of strands, each of the strands comprising liquid crystal polymer fibers, said strands extending along a length of the lifting member;
a first polymer coating on outer surfaces of the fibers or on outer surfaces of the strands;
a second polymer coating disposed over the first polymer coating;
a third polymer coating disposed over the second polymer coating;
wherein the third polymer coating is formed from a material different than a material forming the second polymer coating.

2. The lifting member of claim 1 , wherein the first polymer coating includes active groups selected from glycidyl, carboxyl, amino, isocyanate, amide or hydroxyl.

3. The lifting member of claim 1 , wherein the first polymer coating comprises an acrylic polymer, an epoxy polymer, a urethane polymer, melamine resins, or acrylamide polymer.

4. The lifting member of claim 1 , wherein the liquid crystal polymer comprises an aromatic polyester.

5. The lifting member of claim 1 , wherein the strands comprise at least 50 wt. % liquid crystal polymer fibers, based on total weight of the strands.

6. The lifting member of claim 1 , wherein the strands further comprise fibers selected from carbon fibers, glass fibers, polybenzoxazole fibers, or polyamide fibers.

7. The lifting member of claim 1 , wherein the second polymer coating comprises an elastomeric polymer selected from polyamides, olefins, elastomers, EPDM, fluoropolymers, chloropolymers, or chlorosulfurno elastomers.

8. The lifting member of claim 1 , wherein the third polymer coating comprises an ethylene propylene diene polymer.

9. The lifting member of claim 8 , wherein the third polymer coating further includes a UV stabilizer or both a flame retardant and a UV stabilizer.

10. A method of making the lifting element of claim 1 , the method comprising:
providing the plurality of strands comprising liquid crystal polymer fiber filaments, said fiber filaments or said strands coated with the first polymer coating or a precursor to the first polymer coating;
forming the plurality of strands into the rope;
disposing the second polymer coating over the plurality of strands;
disposing the third polymer coating over the second polymer coating as an outer layer of the rope.

11. The method of claim 10 , further comprising forming said strands from said liquid crystal polymer fiber filaments, said filaments coated with the first polymer coating or precursor to the first polymer coating.

12. A method of making the lifting element of claim 1 , the method comprising:
forming the plurality of strands comprising liquid crystal polymer fiber filaments into the rope;
impregnating the strands with a fluid composition comprising the first polymer coating or a precursor to the first polymer coating;
disposing the second polymer coating over the impregnated strands;
disposing the third polymer coating over the second polymer coating as an outer layer of the rope.

13. An elevator system, comprising
a hoistway;
an elevator car disposed in the hoistway and movable therein; and
a lifting member according to claim 1 , said lifting member operably connected to the elevator car to suspend and/or drive the elevator car along the hoistway.

14. The elevator system of claim 13 , wherein the first polymer coating includes active groups selected from glycidyl, carboxyl, amino, isocyanate, amide or hydroxyl.

15. The elevator system of claim 13 , wherein the first polymer coating comprises an acrylic polymer, an epoxy polymer, a urethane polymer, melamine resins, or acrylamide polymer.

16. The elevator system of claim 13 , wherein the liquid crystal polymer comprises an aromatic polyester.

17. The elevator system of claim 13 , wherein the strands comprise at least 50 wt. % liquid crystal polymer fibers, based on total weight of the strands.

18. The elevator system of claim 13 , wherein the strands further comprise fibers selected from carbon fibers, glass fibers, polybenzoxazole fibers, or polyamide fibers.

19. The elevator system of claim 13 , wherein the second polymer coating comprises an elastomeric polymer selected from polyamides, olefins, elastomers, EPDM, fluoropolymers, chloropolymers, or chlorosulfurno elastomers.

20. The elevator system of claim 13 , wherein the third polymer coating comprises an ethylene propylene diene polymer.

Assignees

• Otis Elevator Corp
• Otis Elevator Co

Inventors

• Zhao Chen Qian

Classifications

• D07B2501/2007

  Elevators · CPC title

• D07B2205/205

  Aramides · CPC title

• D07B2201/2044

  comprising polymers · CPC title

• B66B7/06 Primary

  Arrangements of ropes or cables · CPC title

• D07B1/162

  characterised by a plastic or rubber enveloping sheathing · CPC title