Elevator escape arrangement

• US 20080078627A1
• Filed: 08/31/2006
• Published: 04/03/2008
• Est. Priority Date: 08/31/2006
• Status: Active Grant

• Current Assignee: Chiu Nan Wang
• Original Assignee: Chiu Nan Wang
• Inventors: Wang, Chiu Nan
• Granted Patent: US 7,556,126 B2
• Time in Patent Office: Days
• US Class Current: 187/314
• CPC Class Codes: B66B 11/0226 Constructional features, e.g. walls assembly, decorative panels, comfort equipment, thermal or sound insulation
• CPC Class Codes: B66B 5/027 to permit passengers to leave an elevator car in case of failure, e.g. moving the car to a reference floor or unlocking the door

Abstract

An elevator escape arrangement includes a hinged window on a car; an escape rope passed by the window; a spring biased linking mechanism interconnected the window and a door; and a drive assembly including a first shaft, a detent block on the first shaft and between two brake bars, a cam-like member engaged with a drive sheave, a pulley on the first shaft with the escape rope run, a first gear on the first shaft, a second gear meshed with the first gear, and a second shaft passed through the second gear and the cam-like member. In case of emergency with the car stuck between two floors, the car and a counterweight balanced, and the brake activated, opening the window will cause the linking mechanism to lock the door, pulling the escape rope will unbalance and move the car, and closing the window will unlock the door for escape therethrough.

Claims

1. An emergency arrangement for an elevator including a car, a counterweight, and hoist ropes having one ends connected to a top of the car, comprising:

a hinged window provided on a side wall of the car;

an escape rope provided vertically along a hoistway and passed by the window;

a switch provided on a frame of the window;

a linking mechanism provided proximate one side of the door of the car and including a linking rope having the other end extended to the hinge side of the window, and a spring biased bar having one end connected to one end of the linking rope; and

a drive assembly mounted in a machine room and including a motor, a drive sheave driven by the motor with the hoist ropes run, a brake attached between the motor and the drive sheave and including two opposite top brake bars, a first shaft provided on an upper portion of the brake, a detent block fixedly mounted on the first shaft and disposed between the brake bars, a cam-like member engaged with the drive sheave, a pulley assembly provided at one end of the first shaft distal the detent block with the escape rope run, a first gear provided around the first shaft between the pulley assembly and the detent block, a second gear meshed with the first gear, and a second shaft passed through the second gear and the cam-like member;

whereby in a case of emergency during an upward or a downward travel of the elevator with the car stuck between two floors, the car and the counterweight balanced, and the brake activated,

opening the window by a passenger trapped in the car will open the switch to lock the door and pull the linking rope to extend the other end of the bar for blocking the door from being opened forcedly;

pulling the escape rope will turn the pulley assembly to turn the first gear and the first shaft with (i) the detent block turned to release the brake by interconnecting the brake bars per a predetermined degree revolution of the first shaft and activate the brake by disconnecting the brake bars per a further predetermined degree revolution of the first shaft, and (ii) the cam-like member turned to turn the drive sheave intermittently, thereby unbalancing the car and the counterweight to move the car to a nearest floor; and

leaving the window will close the window automatically and unlock the door by closing the switch and retracting the other end of the bar into the linking mechanism.

2. The emergency arrangement of claim 1, wherein the detent block has an oval section.

3. The emergency arrangement of claim 2, wherein the predetermined degree revolution of the first shaft is 90 degree.

4. The emergency arrangement of claim 1, wherein the detent block has a square section.

5. The emergency arrangement of claim 4, wherein the predetermined degree revolution of the first shaft is 45 degree.

6. The emergency arrangement of claim 1, wherein the detent block has a hexagonal section.

7. The emergency arrangement of claim 6, wherein the predetermined degree revolution of the first shaft is 30 degree.

8. The emergency arrangement of claim 1, wherein the cam-like member has a section of oval and includes two pads at both ends.

9. The emergency arrangement of claim 1, wherein the cam-like member has a section of square and includes four pads at four corners.

10. The emergency arrangement of claim 1, wherein the cam-like member has a section of hexagon and includes six pads at six corners.

11. The emergency arrangement of claim 1, wherein the window includes one or more guard members.

12. The emergency arrangement of claim 1, wherein the pulley assembly comprises one or more pulleys.

13. The emergency arrangement of claim 1, wherein the drive assembly further comprises an auxiliary motor for driving the first shaft, and a backup power supply such that pulling the escape rope will activate the backup power supply to drive the auxiliary motor to move the car.