Elevator overspeed governor with automatic reset

Patent metadata

Field	Value
Publication number	US-2017190545-A1
Application number	US-201715398358-A
Country	US
Kind code	A1
Filing date	Jan 4, 2017
Priority date	Jan 4, 2016
Publication date	Jul 6, 2017
Grant date	—

Abstract

A governor assembly is provided including a sheave rotatably mounted on a shaft and a ratchet disc mounted on the shaft. Rotation of the ratchet disc is restricted. An overspeed assembly includes a swing jaw mounted to the sheave. The swing jaw is movable between a normal position and a tripped position. The swing jaw is biased into the tripped position. When the swing jaw is in the tripped position, rotation of the sheave in a first direction is restricted. A tripping lever is pivotally mounted to the sheave and is configured to cooperate with the swing jaw. Rotation of the sheave in a second, opposite direction is configured to automatically move the swing jaw against its bias to the normal position.

First claim

What is claimed is:

1 . A governor assembly, comprising:
a sheave rotatably mounted on a shaft; and an overspeed assembly including: a swing jaw mounted to the sheave movable between a normal position and a tripped position, the swing jaw being biased into the tripped position, wherein when the swing jaw is in the tripped position, rotation of the sheave in a first direction is restricted; and a tripping lever pivotally mounted to the sheave, the tripping lever being configured to cooperate with the swing jaw, wherein rotation of the sheave in a second, opposite direction is configured to automatically move the swing jaw against its bias to the normal position.

2 . The governor assembly according to claim 1 , wherein a biasing mechanism extending between the sheave biases the swing jaw into the tripped position.

3 . The governor assembly according to claim 1 , wherein the swing jaw includes a shoulder and the tripping lever includes a protrusion, and during normal operation, the protrusion is arranged in contact with the shoulder to oppose the bias of the swing jaw.

4 . The governor assembly according to claim 1 , further comprising a ratchet disc mounted on the shaft such that rotation of the ratchet disc is restricted, wherein the swing jaw includes an engagement end and when the swing jaw is in the tripped position, the engagement end contacts the ratchet disc to restrict rotation of the sheave.

5 . The governor assembly according to claim 4 , wherein the engagement end includes a resetting feature and movement of the sheave in the second direction causes the resetting feature to contact a portion of the ratchet disc and rotate the swing jaw opposite its bias.

6 . The governor assembly according to claim 5 , wherein the resetting feature is a lip.

7 . The governor assembly according to claim 5 , wherein the resetting feature is a tooth having an angled surface.

8 . The governor assembly according to claim 7 , wherein the ratchet disc includes a contact member extending perpendicularly from a surface thereof, the contact member being configured to contact the resetting feature of the swing jaw.

9 . The governor assembly according to claim 4 , wherein the ratchet disc includes a plurality of teeth extending about a periphery of the ratchet disc.

10 . The governor assembly according to claim 1 , further comprising at least one flyweight mounted to the sheave and movable between a retracted position and an extended position.

11 . The governor assembly according to claim 10 , wherein the tripping lever is operably coupled to the at least one flyweight such that movement of the at least one flyweight to a deployed position causes the tripping lever to rotate out of contact with the swing jaw.

12 . The governor assembly according to claim 10 , wherein a biasing mechanism biases the flyweight to the retracted position, the biasing mechanism being configured to bias the tripping lever into engagement with the swing jaw.

13 . The governor assembly according to claim 1 , further comprising a remote tripping assembly operably coupled to the tripping lever, the remote tripping assembly being configured to rotate the tripping lever out of contact with the swing jaw.

14 . The governor assembly according to claim 13 , wherein the remote tripping assembly includes:
an actuator; and a movable member operably connected to the actuator, wherein operation of the actuator moves the movable member relative to the tripping assembly.

15 . The governor assembly according to claim 1 , wherein the governor assembly is a part of an elevator system, the elevator system including:
an elevator hoistway; an elevator car movable along at least one car guide rail within said hoistway, the sheave being operably coupled to the elevator car; a counterweight movable along at least one counterweight guide rail within said hoistway; and at least one tension member operably coupling the car and the counterweight.

16 . A method of tripping an overspeed assembly of a governor assembly, comprising:
detecting an overspeed condition of a rotating sheave; rotating a tripping lever out of contact with an adjacent swing jaw; and biasing the swing jaw into contact with a ratchet disc capable of limited rotation.

17 . The method according to claim 16 , further comprising resetting the overspeed assembly, wherein resetting the overspeed assembly includes:
rotating the rotating sheave relative to the ratchet disc such that a resetting feature of the swing jaw engages a portion of the ratchet disc; rotating the swing jaw against its bias; and arranging the tripping lever in contact with a portion of the swing jaw to oppose the bias of the swing jaw.

18 . A method of remotely tripping an overspeed assembly of a governor assembly, comprising:
generating a signal to indicate remote trip; applying power to an actuator; contacting a tripping lever with a movable member operably coupled to the actuator to rotate the tripping lever out of contact with an adjacent swing jaw; and biasing the swing jaw into contact with a ratchet disc capable of limited rotation.

Assignees

• Otis Elevator Co

Inventors

• Dube Randall S
• Desai Aayush

Classifications

• B66B5/044 Primary

  Mechanical overspeed governors · CPC title

• B66B5/24

  by acting on guide ropes or cables · CPC title

• B66B5/046 Primary

  of the pendulum or rocker arm type · CPC title