Door restrictor
First Claim
1. A bi-stable restrictor for an elevator car door comprising:
- a primary source of electrical power;
a detecting member in electrical communication with said primary source of electrical power; and
a locking device connected to said detecting member and adapted to selectively move between a locked position to lock an elevator car door and an unlocked position to unlock the elevator car door in response to actuation controlled by said detecting member, wherein, in the event of a loss of said primary source of electrical power said locking device remains in the selected locked or unlocked position at the time of the loss of said primary source of electrical power.
1 Assignment
0 Petitions
Accused Products
Abstract
An elevator door restrictor system for preventing an elevator door from being opened unless the elevator car is near a floor landing, utilizing battery backed electronics for sensing the presence of a building landing such that the system will continue to maintain the mechanism in the correct state, either locked or unlocked, even if the elevator car continues to move. Wherein even if the battery backup were to become completely discharged, the mechanism will remain in the last state, either locked or unlocked and prevent the elevator car door from being opened until an authorized person takes the appropriate step to move the car or open the car door.
10 Citations
17 Claims
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1. A bi-stable restrictor for an elevator car door comprising:
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a primary source of electrical power;
a detecting member in electrical communication with said primary source of electrical power; and
a locking device connected to said detecting member and adapted to selectively move between a locked position to lock an elevator car door and an unlocked position to unlock the elevator car door in response to actuation controlled by said detecting member, wherein, in the event of a loss of said primary source of electrical power said locking device remains in the selected locked or unlocked position at the time of the loss of said primary source of electrical power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A bi-stable restrictor for an elevator car door comprising:
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a primary source of electrical power;
a secondary source of electrical power provided as a backup for said primary source of electrical power;
a detecting member in electrical communication with said primary source of electrical power and said secondary source of electrical power; and
a locking device connected to said detecting member and adapted to selectively switch said locking device between a locked position to lock an elevator car door and an unlocked position to unlock the elevator car door in response to actuation controlled by said detecting member, wherein, in the event of a loss of said primary source of electrical power and said secondary source of electrical power said locking device remains in the selected locked or unlocked position at the time of the loss of said secondary source of electrical power. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of controlling an opening of elevator car doors, comprising the steps of:
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a) providing a detecting member elevator connected to a primary source of electrical power and producing a signal from the detecting member responsive to a position of an;
b) selectively controlling a locking device for elevator car doors with the signal produced by the detecting member;
c) providing a secondary source of electrical power, and operating the secondary source of electrical power as a backup to the primary source of electrical power to supply electrical power to the detecting member upon loss of the primary source of power; and
d) causing the locking device to remain in the selected position upon a loss of the secondary source of electrical power.
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Specification