TECHNICAL FIELD

The present invention relates to an elevator apparatus that makes a car perform an emergency stop using an emergency safety gear if a suspending body breaks, for example.

BACKGROUND ART

In conventional elevator apparatus speed governors, a first overspeed Vos (an activating speed of an operation stopping switch) is set to approximately 1.3 times a rated speed Vo, and a second overspeed Vtr (a safety tripping speed) is set to approximately 1.4 times the rated speed Vo. If it is detected that car speed has exceeded the rated speed and reached the first overspeed Vos, due to an abnormality in the controlling apparatus, for example, power supply to a hoisting machine is interrupted to stop the car urgently using a hoisting machine brake. If it is detected that the car is falling due to breakage of a main rope, etc., and the car speed reaches the second overspeed Vtr, an emergency safety gear activates to make the car perform emergency stopping.

However, if the car is positioned in a vicinity of a lowest floor in a hoistway, and the car reaches a bottom portion of the hoistway before the car speed reaches the first overspeed Vos and the second overspeed Vtr, the car is made to decelerate and stop by a buffer. For this purpose, a longer buffering stroke is required in the buffer as the speed that must be decelerated increases, and the length of the buffer is determined by the first overspeed Vos and the second overspeed Vtr. Furthermore, if the buffer is lengthened, pit depth of the hoistway must be increased.

In answer to that, in conventional double-deck elevators, inertial masses are added to speed governor ropes that are respectively installed on an upper car and a lower car that can mutually move in opposite vertical directions inside a car frame. If a rope that drives the upper car or the lower car breaks, an emergency safety gear is activated at high response by forces of inertia that arise as a result of acceleration of a car falling (see Patent Literature 1, for example).

In other conventional elevator apparatuses, an emergency safety gear is activated by a large car acceleration that arises due to rope breakage. An angle of an activating lever, tension of a speed governor rope, and rotational inertial mass of a speed governor mechanism are also set such that the emergency safety gear does not malfunction at a small acceleration (see Patent Literature 2, for example).

CITATION LIST

Patent Literature

[Patent Literature 1]

Japanese Patent Laid-Open No. 2012-62124 (Gazette)

[Patent Literature 2]

Japanese Patent Laid-Open No. 2012-162374 (Gazette)

SUMMARY OF THE INVENTION

Problem to be Solved by the Invention

In conventional elevator apparatuses such as those described above, if an ascending car is stopped suddenly by a hoisting machine brake for any reason, then the car decelerates by approximately 0.3 G. In other words, a downward acceleration occurs at the car. Because of that, there is a risk that the emergency safety gear may malfunction due to rotational inertial mass of the speed governor mechanism.

The present invention aims to solve the above problems and an object of the present invention is to provide an elevator apparatus that enables space saving in a hoistway by a simple configuration, while preventing malfunction of an emergency safety gear.

Means for Solving the Problem

An elevator apparatus according to the present invention includes: a car that ascends and descends through a hoistway; a car guide rail that guides ascent and descent of the car; a suspending body that suspends the car; an emergency safety gear that is disposed on the car, and that grips the car guide rail to make the car perform emergency stopping; an activating lever that is disposed on the emergency safety gear, and that activates the emergency safety gear; a speed governor mechanism that includes: a speed governor sheave; a tensioning sheave that is disposed so as to be spaced apart from the speed governor sheave in a vertical direction; 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; and a resistance applying mechanism that is disposed on the car, and that applies a resisting force during ascent of the car against movement of the activating lever in a direction that activates the emergency safety gear.

An elevator apparatus includes: a car that ascends and descends through a hoistway; a car guide rail that guides ascent and descent of the car; a suspending body that suspends the car; an emergency safety gear that is disposed on the car, and that grips the car guide rail to make the car perform emergency stopping; an activating lever that is disposed on the emergency safety gear, and that activates the emergency safety gear; a speed governor mechanism that includes: a speed governor sheave; a tensioning sheave that is disposed so as to be spaced apart from the speed governor sheave in a vertical direction; 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; and an activation restricting mechanism that is disposed on the car, and that restricts movement of the activating lever in a direction that activates the emergency safety gear during ascent of the car.

Effects of the Invention

In an elevator apparatus according to the present invention, because a resisting force is applied to movement of an activating lever, or movement of the activating lever is restricted, during ascent of a car, space saving in a hoistway can be achieved by a simple configuration, while preventing malfunction of an emergency safety gear.

