JP2008189420A - Emergency stop device for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple-structured emergency stop device for an elevator capable of stopping a car at certain deceleration independently of an increase/decrease of the loading weight of the car even in a case wherein the car is accelerated downward. <P>SOLUTION: In the case wherein a light load is applied to the car 1, a brake body 11 reduces the clearance quantity in the vertical direction usually formed between a lower frame 3, and in the case wherein a heavy load is applied to the car 1, the brake body 11 increases the clearance quantity. In emergency, the brake body 11 rises in the clearance till the brake body 11 abuts on the lower frame 3, and presses a guide rail 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an emergency stop device for an elevator.

  A conventional elevator emergency stop device detects that the speed of the car has increased downward by means of a speed governor and raises the emergency stop shoe upward with respect to the car. The emergency stop shoe moves along the inclination of the emergency stop guide and contacts the guide rail. The emergency stop shoe moves up to contact with the upper plate arranged on the lower surface of the car floor, and pushes the emergency stop guide in the opposite direction of the guide rail. At this time, the clamp opens in a letter C shape with the emergency stop shoe side opened around the pin, and the opposite side is narrowed to compress the emergency stop compression spring. With the restoring force of the emergency stop compression spring, the emergency stop shoe is pressed against the guide rail. The amount of compression of the emergency stop compression spring at this time is determined by the distance between the upper plate lower surface of the lower frame on the upper surface of the emergency stop shoe, and braking force is generated by friction between the emergency stop shoe and the guide rail, and the car is stopped. Let The deceleration of the elevator safety device constructed in this way is set so as to satisfy a predetermined value when the car's payload is maximum, so if there are few passengers in the car, There is a problem that the deceleration becomes too large as compared with a case where the weight is almost equal to the maximum load weight (see, for example, Patent Document 1).

  Therefore, the weight of the car is measured by a weighing device, and a wedge piece position adjusting means for adjusting the movement amount of the wedge piece constituting the emergency stop shoe by moving the stopper according to the measured amount is provided. An elevator emergency stop device that sets a deceleration according to the loaded weight has been proposed (see, for example, Patent Document 2).

JP-A-5-147856 International Publication No. WO2006 / 064555 (FIGS. 4 and 5)

  However, the wedge piece position adjusting means of Patent Document 2 requires a complicated mechanism for moving the stopper. In addition, since the number of parts is large, there are problems that the cost of parts is increased and it takes time to produce parts.

  The present invention has been made in order to solve the above-described problems. The object of the present invention is to achieve a constant reduction regardless of increase / decrease in the load weight of the car even when the car is accelerated downward with a simple configuration. It is to provide an emergency stop device for an elevator that stops a car at a speed.

  The elevator emergency stop device according to the present invention includes a car floor, a lower frame disposed below the car floor, and disposed between the car floor and the lower frame, and depending on a load weight of the car, A scale device that supports a car while displacing the car in a vertical direction with respect to the lower frame, an emergency stop support that is disposed below the lower frame and is fixed to the car floor, and an amount of increase relative to the emergency stop support. A brake body provided on the emergency stop support body so as to increase the pressing force to the guide rail as the load increases, and the brake body, when a light load is applied to the car, Reduce the amount of vertical gap formed between the lower part and increase the amount of clearance when the car is heavily loaded, and increase the amount of clearance until it contacts the lower frame in an emergency. The guide rail It is intended to press the.

  The present invention provides a car floor, a lower frame disposed below the car floor, and is disposed between the car floor and the lower frame, and the car is attached to the lower frame in accordance with a load weight of the car. A balance device that supports the displacement while being displaced in the vertical direction, an emergency stop support that is disposed below the lower frame and is fixed to the car floor, and an increase in the amount of lift relative to the emergency stop support, as well as a push on the guide rail. A braking body provided on the emergency stop support so as to increase the pressure, and the braking body is formed between the lower part of the car frame in a normal state when a light load is applied to the car. When the car is under heavy load, increase the gap amount and, in an emergency, increase the gap amount until it touches the lower frame and press the guide rail. By adopting a configuration to A single structure, even when the car is accelerated downward, it is possible to provide a safety device for an elevator to stop the car at a constant deceleration regardless of the increase or decrease of the load weight of the car.

  In order to explain the present invention in more detail, it will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

Embodiment 1 FIG.
1 is a front view of an emergency stop device for an elevator according to Embodiment 1 of the present invention, and shows a state where a light load is applied to a car. FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a front view of an emergency stop device for an elevator according to Embodiment 2 of the present invention, showing a state in which a heavy load is applied to the car.

  In general, a lower frame 3 constituting a lower part of a car frame (not shown) is disposed below the car floor 2 constituting the lower part of the car 1. In addition, a weighing device 4 having an elastic body 4a made of a plurality of rubbers and compression springs is disposed between the car floor 2 and the lower frame 3, and the elastic body 4a according to the increase or decrease of the load weight of the car 1. The car 1 is supported while being displaced in the vertical direction with respect to the lower frame 3. On the other hand, in the vicinity of the guide rail 5 below the lower frame 3, when the car 1 is accelerated below the preset speed, the emergency stop that holds the guide rail 5 and stops the descent of the car 1. A guide rail clamping part 6 of the apparatus is arranged. The guide rail clamping portion 6 includes an emergency stop support body 7 including an emergency stop support frame, a pair of clamps 8 that are pivotally supported by the emergency lock support body 7, and an end portion on the center side of the hoistway of the clamps 8. A compression spring 9 for emergency stop that is fixed at both ends thereof, a pressing body 10 comprising a pair of guides that are fixed to the ends of the pair of clamps 8 on the side of the guide rail 5, both rail surfaces of the guide rail 5, and a pair of It is comprised from the braking body 11 comprised with the wedge piece which consists of a pair of emergency stop shoes arrange | positioned between the press bodies 10. FIG.

  A plurality of brake bodies 11 are arranged on the pressing surface of the pressing body 10 in an emergency when it is detected by a speed governor (not shown) that the car 1 has been accelerated below a preset speed. An emergency stop support 7 is provided by a speed governor rope (not shown) with the guide surface along the pressing surface of the pressing body 10 via the roller 12 and with the braking surface in contact with the rail surface of the guide rail 5. It is installed so that it can be raised. Further, in the ascending process of these braking bodies 11, the pair of pressing bodies 10 are moved from the rail surface of the guide rail 5 as the amount of elevation of the braking body 11 with respect to the emergency stop support body 7 increases due to the wedge action of the braking body 11. Increase the amount of movement in the away direction. Following the movement of the pressing body 10, the movement amount in the direction in which the guide rail 5 side ends of the pair of clamps 8 are separated from both rail surfaces of the guide rail 5 is also increased. As a result, the hoistway center side end portions of the pair of clamps 8 rotating via the pins 13 increase the amount of movement in the direction approaching each other. Accordingly, the amount of compression of the emergency stop compression spring 9 whose both ends are fixed to the central ends of the hoistway of the pair of clamps 8 also increases. That is, these braking bodies 11 are configured to generate a braking force that stops the lowering of the car 1 in an emergency by increasing the pressing force on the rail surface of the guide rail 5 with an increase in the amount of lift relative to the emergency stop support 7. It has become. The elevator safety device according to the present invention has a simple configuration and stops the car 1 at a constant deceleration regardless of the increase or decrease of the load weight of the car 1. Hereinafter, the emergency stop device for an elevator according to the present invention will be described in detail.

  In the figure, reference numeral 1 denotes a car that is guided by a guide rail 5 to move up and down, 2 a car floor that constitutes the lower part of the car 1, 3 a lower frame that is arranged below the car floor 2 and constitutes the lower part of the car frame, 4 Includes an elastic body 4a made of a plurality of rubbers and compression springs, and increases or decreases the amount of compression of the elastic body 4a in accordance with the increase or decrease of the load weight of the car 1, while the car 1 is displaced in the vertical direction with respect to the lower frame 3. It is the scale apparatus to support. A pair of emergency stop supports 7 constituting the guide rail clamping portion 6 of the emergency stop device of the present invention is disposed below the lower frame 3 and has an U-shaped longitudinal section with the opening facing the rail surface side of the guide rail 5. Is formed. These emergency stop supports 7 are fixed to the lower surface of the car floor 2 by a car floor connecting portion 7c that protrudes vertically upward from the intersection of the upper horizontal portion 7a and the vertical connecting portion 7b and passes through the lower frame 3, The car 1 is displaced in the vertical direction with respect to the lower frame 3 in accordance with the increase or decrease of the loaded weight. Further, between the lower surface of the upper horizontal portion 7a and the upper surface of the lower horizontal portion 7d of the emergency stop support body 7, a pin 13 extending in the vertical direction in the vicinity of the opposite portion of the center portion is pivoted to the emergency stop support body 7. A pair of supported jaws 8 are arranged. Both ends of the emergency stop compression spring 9 are fixed in the vicinity of the central side end of the hoistway of these clamps 8, while facing the guide rail 5 provided in the notch at the side end of the guide rail 5. A pair of pressing bodies 10 are fixed to the surface. These pressing bodies 10 are formed such that a pressing surface arranged on the rail surface side of the guide rail 5 is inclined in a direction away from the rail surface of the guide rail 5 from above to below.

  Further, between the pressing body 10 and the rail surfaces of the guide rail 5, a braking surface formed in parallel with the rail surface of the guide rail 5 and a pressing surface of the pressing body 10 are in parallel with each other. A pair of braking bodies 11 having guide surfaces formed in this manner are arranged. A plurality of these braking bodies 11 are arranged on the pressing surface of the pressing body 10 in the event of an emergency in which it is detected by the governor that the speed of the car 1 is increased below the preset speed, as in the past. A structure in which the guide surface is aligned with the pressing surface of the pressing body 10 via the roller 12 and is pulled up with respect to the emergency stop support 7 by the governor rope while the braking surface is in contact with the rail surface of the guide rail 5. It has become. In other words, the brake body 11 increases the amount of rise of the emergency stop support 7 and the amount of compression of the emergency stop compression spring 9 by the wedge action, thereby increasing the pressing force on the rail surface of the guide rail 5. The emergency stop support 7 is provided. Also, on the lower surface of the lower frame 3, a pair of protective side plates 14 and a pair of protective lower plates 15 projecting so as to face each other so as to wrap around the guide rail clamping portion 6 of the safety device are provided. Yes.

  In the elevator safety device constructed in this way, for example, as shown in FIG. 1, when there are no passengers in the car 1, that is, when a light load of only its own weight is applied to the car 1, The elastic body 4a is compressed based on its own weight, and the vertical gap amount formed between the upper surface of the braking body 11 and the lower surface of the lower frame 3 is L1 in a normal state. In this state, when it becomes an emergency when the speed governor detects that the car 1 has been accelerated below the preset speed, the braking body 11 stops the upper end from the rail surface of the guide rail 5 from below. The gap L1 with respect to the emergency stop support 7 is passed through the gap formed between the ends of the upper horizontal portion 7a of the support 7 on the guide rail 5 side until the upper surface is brought into contact with the lower surface of the lower frame 3. To rise.

  On the other hand, as shown in FIG. 3, when a passenger enters the car 1, that is, when the car 1 is subjected to its own weight and the weight of the passenger and is heavily loaded, the weight of the car 1 and the weight of the passenger are increased. Based on this, the elastic body 4a is compressed. In this case, the amount of compression of the elastic body 4a increases as compared with the case where a light load is applied to the car 1. At this time, the braking body 11 moves downward with respect to the lower frame 3 by the amount of the compression increase of the elastic body 4a together with the car 1, the emergency stop support body 7 and the like. As a result, the vertical gap formed between the upper surface of the braking body 11 and the lower surface of the lower frame 3 in the normal state is the amount of increase in compression of the elastic body 4a in L1 when a light load is applied to the car 1. The added L2. In this state, when it is an emergency that the speed governor detects that the speed of the car 1 has been increased below the preset speed, the brake body 11 has an upper end facing the rail surface of the guide rail 5 from below. The amount of clearance with respect to the emergency stop support 7 until the upper surface is brought into contact with the lower surface of the lower frame 3 through the gap formed between the ends of the upper horizontal portion 7a of the stop support 7 on the guide rail 5 side. Increase L2.

  That is, when a light load is applied to the car 1, the braking body 11 reduces the vertical gap formed between the lower frame 3 and the car 1 at a normal time, and a heavy load is applied to the car 1. In such a case, the clearance is set to increase, and in an emergency, the clearance is increased and the rail surface of the guide rail 5 is pressed until the upper surface is brought into contact with the lower surface of the lower frame 3. Has been.

  According to the first embodiment described above, the braking body 11 reduces the amount of vertical gap formed between the brake body 11 and the lower frame 3 in a normal state when a light load is applied to the car 1. When a heavy load is applied to the car 1, it is installed so as to increase the gap amount. In an emergency, the gap amount is increased until the upper surface is brought into contact with the lower surface of the lower frame 3, and the guide rail is increased. 5 rail surface is pressed. For this reason, the braking body 11 can increase and decrease the pressing force to the guide rail 5 according to the increase and decrease of the load weight of the car 1, and can obtain a stable and constant deceleration of the car 1. Moreover, a highly reliable elevator emergency stop device can be obtained with a structure having a small number of parts without requiring a complicated mechanism.

Embodiment 2. FIG.
FIG. 4 is a front view of an elevator safety device according to Embodiment 2 of the present invention.

  In the second embodiment, a buffer body 16 made of rubber or the like is fixed to the upper surface of the brake body 11. In other respects, the configuration is the same as that of the first embodiment. In this case, in an emergency when it is detected by the governor that the speed of the car 1 has been increased below the preset speed, the shock due to the contact between the upper surface of the brake body 11 and the lower surface of the lower frame 3 is buffered. 16 absorbs.

  According to the second embodiment described above, in addition to the same effects as the first embodiment, the shock absorber 16 absorbs the shock caused by the contact between the upper surface of the braking body 11 and the lower surface of the lower frame 3, so 1 can be reliably prevented from being transmitted to the inside. The same effect can be obtained by fixing the buffer body 16 not at the upper surface of the brake body 11 but at a position facing the upper surface of the brake body 11 on the lower surface of the lower frame 3.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an elevator safety device according to Embodiment 1 of the present invention, showing a state where a light load is applied to a car. It is sectional drawing in the AA of FIG. It is a front view of the elevator safety device in Embodiment 1 of this invention, Comprising: It is a figure which shows the state in which the heavy load is applied to the cage | basket | car. It is a front view of the emergency stop apparatus of the elevator in Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car 2 Car floor 3 Lower frame 4 Weighing device 4a Elastic body 5 Guide rail 6 Guide rail clamping part 7 Emergency stop support 7a Upper horizontal part 7b Vertical connection part 7c Car floor connection part 7d Lower horizontal part 8 Retaining 9 Compression spring 10 Press body 11 Brake body 12 Roller 13 Pin 14 Protection side plate 15 Protection lower plate 16 Buffer

Claims (4)

The basket floor,
A lower frame disposed below the car floor;
A scale device disposed between the car floor and the lower frame, and supporting the car while displacing the car in a vertical direction with respect to the lower frame in accordance with a load weight of the car;
An emergency stop support disposed below the lower frame and fixed to the car floor;
A braking body provided on the emergency stop support so as to increase the pressing force on the guide rail with an increase in the amount of lift relative to the emergency stop support;
With
When the brake body is lightly loaded on the car, the vertical gap formed between the car frame and the lower part of the car frame in a normal state is reduced, and the car is heavily loaded. Is an emergency stop device for an elevator, which increases the gap amount and raises the gap amount and presses the guide rail until it comes into contact with the lower frame in an emergency.   2. The elevator emergency stop device according to claim 1, wherein the scale device is composed of an elastic body that increases or decreases the amount of compression in the vertical direction in accordance with an increase or decrease in the load weight of the car. The emergency stop support includes a pressing body formed so that a pressing surface disposed on the rail surface side of the guide rail is inclined in a direction away from the rail surface from above to below,
3. The elevator emergency stop device according to claim 1, wherein the brake body is configured by a wedge piece that rises with respect to the emergency stop support body along the pressing surface. 4.   The shock absorbing body which absorbs the impact by contact | abutting of the said braking body and the said lower frame is being fixed to the opposing position of the said braking body upper surface of a braking body upper surface or a lower frame lower surface. The elevator emergency stop device according to any one of 3 above.

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