Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Eiji Ando

Seiji Watanabe

Takashi Yumura

Takaharu Ueda

Hiroshi Kigawa

Naohiro Shiraishi

Kotaro Fukui

Yoshikatsu Hayashi

Takuo Kugiya

Mineo Okada

Naoyuki Maruyama

Hiroyuki Nakagawa

Masayuki Kakio

Atsushi Mitsui

Yoshihiko Koizumi

Kiyoshi Funai

Hideki Miyahara

Shiro Ikeda

Koei Matsukawa

In an elevator apparatus, an activating lever that activates an emergency safety gear is disposed on the emergency safety gear. A speed governor mechanism has: a speed governor sheave; a tensioning sheave; and a speed governor rope that is wound onto the speed governor sheave and the tensioning sheave, and that is connected to the activating lever. A resistance applying mechanism is disposed on the car. The resistance applying mechanism applies a resisting force during ascent of the car against movement of the activating lever in a direction that activates the emergency safety gear.

Elevator apparatus

An emergency stop device for an elevator car, including: a link configured to be rotated about a rotary shaft installed on a car by movement of a speed governor rope; a rail stopper provided to one end of the link; a roller guide mounted to the car; and an elastic member provided between another end of the link and the car. The elastic member causes a spring reaction force to be reduced to bring the rail stopper into abutment against the roller guide even when the rail stopper is displaced by the link, when the displacement exceeds a preset threshold value due to further displacement by the link along with the movement of the speed governor rope at a time of occurrence of rope breakage.

Emergency stop device for an elevator car

In an elevator apparatus, an abnormal acceleration detecting mechanism detects abnormal acceleration of an ascending/descending body due to breakage of a suspending body, and activates a safety device. The abnormal acceleration detecting mechanism includes: an inertia sheave that is rotatable around a sheave shaft independently from an interlocking sheave; a pawl that is connected to the interlocking sheave and the inertia sheave, and that is displaceable between a normal position, and an activating position that displaces a movable shoe to a gripping position; and an elastic body that holds the pawl in the normal position by applying an initial pressure, and that also rotates the inertia sheave together with the interlocking sheave.

In a multi-car elevator, if two vertically adjacent cars among the cars are designated first and second cars, then: a zone that is a distance in which the second car can be stopped in response to an abnormality, and into which the first car is not permitted to enter is set as an exclusion zone of the second car; a position before which it is necessary for the first car to stop is set as a stopping limit position of the first car; and a plurality of threshold values that progressively detect the abnormal approach are set so as to enable the first car to decelerate and stop before the stopping limit position of the first car.

Multi-car elevator using an exclusion zone and preventing inter-car collision

In a safety system for an elevator, slip detection means detects a slip between a drive sheave and a main rope. A safety gear is mounted to a car, the safety gear being electrically operated by an actuator to cause the car to make an emergency stop regardless of whether a running direction of the car is upward or downward. A safety gear controller cuts power supply to a hoisting machine motor and causes the safety gear to make a braking operation upon detection of the slip between the drive sheave and the main rope by the slip detection means.

Safety device for elevator and rope slip detection method

In a safety system for an elevator, a safety gear is mounted to a car, the safety gear being electrically operated by an actuator to cause the car to make an emergency stop regardless of whether a running direction of the car is upward or downward. A safety gear controller cuts power supply to a hoisting machine motor and causes the safety gear to make a braking operation upon detection of the slip between the drive sheave and the main rope based on a drive sheave acceleration exceeding a predetermined value.

Safety device for elevator and rope slip detection method using drive sheave acceleration

An elevator system in which a controller monitors whether or not a speed of an ascending/descending body reaches a preset overspeed. At a time of maintenance work, a stopper is interposed between a buffer and the ascending/descending body to limit a lowered position of the ascending/descending body. A stopper detector detects installation of the stopper onto at least one of the buffer and the ascending/descending body. When the stopper is detected by the stopper detector, the controller lowers a set value of the overspeed.

Elevator system which controls a value of overspeed

In an elevator apparatus, a main rope suspending a car and a balance weight is looped around a traction sheave and a driven sheave of a traction machine. A driving-side speed detecting portion for detecting rotational speed of the traction sheave and a driven-side speed detecting portion for detecting rotational speed of the driven sheave are electrically connected to an operation control device. The operation control device includes a determination portion determining presence or absence of an abnormality in an elevator by calculating speed difference between rotational speeds of the traction sheave and comparing the speed difference to a fixed reference value, set in advance, and a control portion for controlling the operation of the elevator based on information from the determination portion.

Elevator apparatus with sheave rotational speed difference determination for detecting an abnormality

In a rope supporting apparatus for an elevator, a column-like body along a guide rail provided within a hoist way is mounted on the guide rail through support bodies located at upper and lower ends of the guide rail. A rope end fixing member to which an end of a rope is fixed is fastened to the column-like body. The column-like body has a higher bending strength than the guide rail. Since the support bodies at both upper and lower ends of the column-like body are disposed with a sufficient distance between them, a pivoting reactive force, which is a load generated in the support bodies in a direction perpendicular to a center axis of the rail, becomes small, and any bending moment applied to the guide rail by the pivoting reactive force is smaller than the bending moment applied to the column-like body.

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Eiji Ando