FI112640B - Elevator safety device - Google Patents

Description

112640

LIFT SAFETY DEVICE

The invention relates to an elevator safety device as defined in the preamble of claim 1.

When installing lifts in old buildings, it is often necessary 5 to use solutions that take up minimal space. Possible extensions of the upper and lower spaces are often technically impossible or expensive to implement. However, there must be safety precautions above and below the body for maintenance purposes.

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According to Finnish application 980594, a safety buffer arrangement at the bottom of the shaft is known in order to secure the required safety space in the elevator shaft in the maintenance situation. Safety buffers thereof can be provided along the passage of the elevator car to block its movement closer to the bottom of the shaft a certain distance and under counterweight to prevent the movement of the body closer to the ceiling of the shaft. The safety devices according to that publication are arranged to lie on the bottom of the shaft, where they can be lifted, if necessary, to the path of the body or counterweight. However, when they are lying on the bottom of the shaft, they also take up some space vertically and are therefore unsuitable for very small space solutions. Removable bumper beams have also been used to provide a safe space, which is «installed during maintenance when a safe space is required». However, known solutions take up space under the body * while driving and are difficult to automate.

J A patent safety device for implementing a safety space is known from CH A 667638 and EP A 725033. At the bottom of the elevator shaft there is a 30 articulated safety device in the space between the outer edge of the basket unit and the opposite wall of the shaft. In the operating position, the safety device is pivoted underneath the basket unit, whereby the buffers of the basket unit; ; hit the safety device and the basket unit stops at a certain height from the bottom of the shaft. In the normal position, the safety device 35 is substantially vertical to the bottom of the shaft with respect to the basket unit; and the shaft wall. This solution also takes up space under the basket.

112640 2 It is an object of the present invention to provide a novel safety device for securing sufficient upper and lower space in a maintenance space in small shaft space elevators.

The invention is based on the idea of utilizing the empty space at the bottom of the shaft as efficiently as possible, so that the safety device does not have to extend the space below the basket unit (consisting of basket or basket and basket) while the elevator is operating normally. By positioning the safety device 10 in the space between the counterweight and the body unit at the bottom of the shaft, it is not in the path of the body unit while driving. If necessary, the safety device according to the invention prevents the passage of the basket unit by turning the safety device under it, whereby the buffers attached below the basket unit hit the safety device and the basket unit 15 stops at a certain height from the bottom of the shaft.

The invention is characterized in what is set forth in the characterizing part of claim 1. Other embodiments of the invention are characterized by what is disclosed in the other claims.

By using the safety device according to the invention, the realization of the safety space is preferably ensured with a small movement. The safety device according to the invention is easily automated. Because the safety device is positioned between the body unit and the counterweight, it does not occupy space under the elevator while driving. It is then possible to use it in elevators with a very small space. It is also possible to use this safety device in non-small-space elevators. The plate-like structure of the safety device also enables it to act as a protective structure between the moving parts of the shaft.

The invention will now be described in detail with reference to the accompanying drawings.

Figure 1 shows a safety device according to the invention.

·, ·; Figure 2 shows the safety device in the normal position.

* '35 Figure 3 shows the safety device in the operating position.

112640 3

Figure 1 illustrates a durable material according to the invention, such as a steel safety device 1 having a plate-like stop device 4 hinged to the bottom of the shaft at its pivot points 6. At the top of the stop device is a handrail 5 . The safety buffers can also be attached to the safety device and are intended to absorb the shock. The basket unit comprises a basket and a basket frame or a simple basket. The safety device rotates between its normal position and the operating position at its nip 10 points 6. The safety device also includes a locking device 7 which locks the safety device 1 in the operating position. The locking device can be manually opened and closed. The security device also has a holding mechanism 20, such as a magnet, for holding the security device in the operating position in addition to the locking device. The magnet 15 then grips the guide rails of the elevator. The retention mechanism also holds the safety device in its normal position so that the magnet is attached to one of the shaft structures, thereby holding the device upright. The safety device is equipped with a microswitch that recognizes the position that informs the elevator control 20 of the safety position.

In Figure 2, the safety device 1 is in the normal position, with the elevator moving normally between floors. The safety device is located on the bottom 10 of the heater in a space 14 where it is between the counterweight and the body unit. The basket unit comprises a basket 19 and a basket frame 25 18 or a basket 19. The space 14 comprises a space between one outer edge 15 of the basket unit and the shaft wall 13, in which the counterweight 16 also moves. The figure shows a counterweight 16, although in reality it cannot be at the bottom of the shaft when the basket unit is on the lower floor. In the situation shown in the figure, the basket unit 9 has driven to the lowest floor. It can be seen that the safety device is very suitable for a small space · solution as it does not take up space underneath the body unit while driving.

If desired, to work above the basket unit 9, the basket; | 35 toli, first stop the body unit at the point where the service, ·,: man opens the roof 11 after opening the doors. To secure the upper safe space to the service person on the roof of the body unit there is a handrail-like safety device 12 which can be swiveled on the roof of the body unit to the safe position.

Fig. 3 shows the safety device 1 in the operating position, whereby it stops the basket unit at a certain height from the bottom of the shaft 5 10 and ensures the safety space. The safety device 1 is secured to the bottom by its pivot points 6, which are two in total per one safety device. When a service technician wants to work at the bottom of the shaft, he first opens the lower floor door to prevent the elevator from running. After that, we go into the pit pit and release the tur-10 light assembly 1 from its retaining mechanism and turn it into its operating position on the passage of the basket unit. In this case, the safety device is locked by means of a locking device and holding mechanism and ensures a safe space in the pit. When the elevator is restored to normal operation, the safety device is turned back to its normal position. Then 15 exit the pit and the elevator control is informed that the elevator can drive.

It will be apparent to one skilled in the art that various embodiments of the invention are not limited to the above examples but may vary within the scope of the appended claims.

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Claims (8)

An elevator safety device (1) for providing a safety space comprising an elevator shaft, a shaft bottom (10), a basket unit 5 (9), a counterweight (16), a level door (11), one outer edge (15) of a basket unit and a corresponding shaft wall 13) a confined space (14) in which the counterweight is movable such that the safety device (1) is arranged on the bottom of the shaft (10) in a space defined by one outer edge of the basket unit and the safety device (1) can be arranged in the passage of the body unit (9) and that the safety device includes a microswitch which informs the elevator control about the safety position and the normal driving of the ban 15, characterized in that the above safety device (1) ) for locking into the operating position and for holding the above-mentioned safety device (1) of the magnet acting as a holding mechanism (20) together with the lock-2 0 with the lifting device (7) such that the magnet acting as the holding mechanism (20) above engages the guide rails of the elevator. Elevator safety device according to Claim 1, characterized in that, in the normal position when driving the elevator, the safety device (1) is substantially vertical between the bottom of the shaft (10) and the body unit (9) and counterweight (16). :, I (· Elevator safety device according to Claim 1 or 2, characterized in that the safety device comprises a stop device (4) which is pivotally connected to the bottom of the shaft (10). •• '30 Elevator safety device according to Claim 3, characterized in that the stopping device (4) is plate-like and is supported by its lower pivot points (6) to the dry bottom (10). Elevator safety device according to claim 3 or 4, characterized in that the stop device (4) has a handrail (5) at the top. 112640 5, 112640 Elevator safety device according to one of the preceding claims, characterized in that the magnet acting as a holding mechanism (20) holds the safety device (1) in a normal position so that the magnet is attached to the shaft structure. Elevator safety device according to Claim 5, characterized in that the safety device (1) has a bracket (5) in which the safety buffers below the basket unit hit the drive position. Elevator safety device according to Claim 1, characterized in that the roof of the body unit has a safety rail (12) to provide a sufficient headroom. »I i 7 112640