Safety devices for elevators with reduced clearances

摘要

In an elevator shaft (100), preferably having an anti creeping device (140) and reduced ends, the reduced ends being the elevator pit and the elevator overhead, a load sensing safety apparatus (110) facilitated to activate the emergency safety gear of the elevator, according to teachings of the present invention, the load sensing safety apparatus including a movable plate, one or more spacing devices (120) one or more pressure sensors (150), and a locking trigger mechanism for triggering the activation of the emergency safety gear of the elevator.

主权项

1. In an elevator including an elevator shaft, the elevator shaft having reduced ends, the reduced ends being an elevator pit and an elevator overhead, a load sensing safety apparatus facilitated to activate emergency safety gear of the elevator, the load sensing safety apparatus comprising:
a) a movable plate; b) one or more spacing devices; c) one or more pressure sensors; and d) a locking trigger mechanism for triggering said activation of the emergency safety gear of the elevator,
wherein said spacing devices maintain said movable plate at a predesigned distance from a surface of the respective reduced end of said elevator shaft, the elevator being in idle state;wherein said one or more pressure sensors are operatively connected to said movable plate;wherein when pressure is applied onto said movable plate towards said surface of said respective reduced end of said elevator shaft, the force of said pressure being over a predesigned threshold value, said movable plate moves towards said surface of said respective reduced end and said one or more pressure sensors sense said pressure, thereby activating said locking trigger mechanism; andwherein said locking trigger mechanism is an arm having a first end and a second end, wherein said first end is securely attached to said movable plate, and wherein when said movable plate moves towards said surface of said reduced ends of said elevator shaft, said second end moves to operatively activate the emergency safety gear of the elevator.