The subject matter disclosed herein relates to elevator systems. More specifically, the subject matter disclosed herein relates to mitigation of sway of suspension and/or driving ropes for elevator systems.
Elevator systems typically include one or more ropes or other suspension members such as belts from which an elevator car is suspended, and with which the elevator car is driven along a hoistway. Tall buildings in particular, which have elevator systems servicing them, have some sway associated with them. This sway, most often experienced during periods of high winds, can seriously impact elevator performance and, in some instances, damage elevator components. For example, building sway can result in rope sway that, especially when the rope length is shortened as the car runs into an upper or lower landing, has a significant lateral amplitude that causes excessive vertical vibration and noise at the elevator car. Further, rope sway effects experienced at the elevator car are increased at certain floors where the rope sway frequency is at or near the building sway vibratory frequency.
In some systems, rollers or other devices may be utilized to prevent ropes from contacting walls of the hoistway, but such rollers can be costly, especially in buildings with an especially tall rise.
In one embodiment, a leader system for load bearing member sway prevention of an elevator system includes a plurality of leader members disposed in a hoistway of the elevator system, and a plurality of load bearing member guides each operably connected to at least one leader member of the plurality of leader members. Each load bearing member guide is movable along the hoistway via operation of the elevator system and includes one or more guide elements interactive with a load bearing member of the elevator system to prevent sway of the load bearing member.
Additionally or alternatively, in this or other embodiments the plurality of leader members are positioned in the hoistway between a top of the hoistway and an elevator car.
Additionally or alternatively, in this or other embodiments the plurality of leader members are positioned in the hoistway between a bottom of the hoistway and an elevator car.
Additionally or alternatively, in this or other embodiments the plurality of leader members are positioned in a nested arrangement in the hoistway.
Additionally or alternatively, in this or other embodiments the plurality of leader members includes three or more leader members.
Additionally or alternatively, in this or other embodiments each load bearing member guide is operably connected to a leader member via a guide holder.
Additionally or alternatively, in this or other embodiments the guide holder is a pulley around which the leader member is at least partially wrapped.
Additionally or alternatively, in this or other embodiments the leader members are configured for connection to a counterweight of the elevator system.
Additionally or alternatively, in this or other embodiments the load bearing member guides are configured to move along the hoistway in response to movement of the counterweight along the hoistway.
Additionally or alternatively, in this or other embodiments the load bearing member guide includes an eyelet through which the load bearing member extends.
In another embodiment, an elevator system includes a hoistway, an elevator car positioned in the hoistway, a load bearing member operably connected to the elevator car to move the elevator car along the hoistway and a leader system to prevent sway of the load bearing member. The leader system includes a plurality of leader members located in the hoistway and a plurality of load bearing member guides each operably connected to at least one leader member of the plurality of leader members. Each load bearing member guide is movable along the hoistway via operation of the elevator system and including one or more guide elements interactive with the load bearing member to prevent sway of the load bearing member.
Additionally or alternatively, in this or other embodiments the plurality of leader members are located in the hoistway between a top of the hoistway and the elevator car.
Additionally or alternatively, in this or other embodiments the plurality of leader members are positioned in a nested arrangement in the hoistway.
Additionally or alternatively, in this or other embodiments the plurality of leader members includes three or more leader members.
Additionally or alternatively, in this or other embodiments each load bearing member guide is operably connected to a leader member via a guide holder.
Additionally or alternatively, in this or other embodiments the guide holder is a pulley around which the leader member is at least partially wrapped.
Additionally or alternatively, in this or other embodiments the leader members are configured for connection to a counterweight of the elevator system.
Additionally or alternatively, in this or other embodiments the load bearing member guides are configured to move along the hoistway in response to movement of the counterweight along the hoistway.
Additionally or alternatively, in this or other embodiments the load bearing member guide includes an eyelet through which the load bearing member extends.
The following descriptions should not be considered limiting in any way. With reference to the accompanying drawings, like elements are numbered alike:
A detailed description of one or more embodiments of the disclosed apparatus and method are presented herein by way of exemplification and not limitation with reference to the Figures.
Shown in
The sheaves 18 each have a diameter, which may be the same or different than the diameters of the other sheaves 18 in the elevator system 10. At least one of the sheaves could be a traction sheave 52. The traction sheave 52 is driven by a machine (not shown). Movement of drive sheave by the machine drives, moves and/or propels (through traction) the one or more load bearing members 16 that are routed around the traction sheave 52. At least one of the sheaves 18 could be a diverter, deflector or idler sheave. Diverter, deflector or idler sheaves are not driven by a machine, but help guide the one or more load bearing members 16 around the various components of the elevator system 10.
In some embodiments, the elevator system 10 could use two or more load bearing members 16 for suspending and/or driving the elevator car 12. In addition, the elevator system 10 could have various configurations such that either both sides of the one or more load bearing members 16 engage the one or more sheaves 18 or only one side of the one or more load bearing members 16 engages the one or more sheaves 18. The embodiment of
The load bearing members 16 are constructed to have sufficient flexibility when passing over the one or more sheaves 18 to provide low bending stresses, meet belt life requirements and have smooth operation, while being sufficiently strong to be capable of meeting strength requirements for suspending and/or driving the elevator car 12.
In some embodiments, such as shown in
Referring again to
In the embodiment of
Each leader member 44 is connected to the counterweight 22 and to a respective load bearing member guide 48. In some embodiments, the leader member 44 is connected to the load bearing member guide 48 via a guide holder 54, which in some embodiments is a pulley or sheave around which the leader member 44 is at least partially wrapped. The guide holder 54 and the load bearing member guide 48 are configured to travel or translate in an upward direction in the hoistway 14 as the counterweight 22 moves downward in the hoistway 14, and likewise the guide holder 54 and the load bearing member guide 48 travel downward in the hoistway 14 when the counterweight 22 travels upward in the hoistway 22.
In some embodiments, such as shown in
Referring again to
Further, in some embodiments, the leader members 44 may be interconnected. For example, as shown in
Operation of the elevator system 10 and the leader system 42 will now be described with reference to
Referring now to
In another embodiment, shown in
In yet another embodiment, shown in
The leader system 42 described herein provides continuous guidance for the load bearing members 16, throughout operation of the elevator system 10, preventing sway of the load bearing members 16, which can cause objectionable noise and/or damage hoistway equipment.
The term “about” is intended to include the degree of error associated with measurement of the particular quantity based upon the equipment available at the time of filing the application. For example, “about” can include a range of ±8% or 5%, or 2% of a given value.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, element components, and/or groups thereof.
While the present disclosure has been described with reference to an exemplary embodiment or embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the essential scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this present disclosure, but that the present disclosure will include all embodiments falling within the scope of the claims.
This application claims the benefit of 62/527,292, filed Jun. 30, 2017, which is incorporated herein by reference in its entirety.
Number | Date | Country | |
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62527292 | Jun 2017 | US |