JPS6222608Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an opening/closing door having a locking device. When the door is closed, the door is automatically and reliably locked and can be easily unlocked.

The drawings will be explained using an example in which the present invention is applied to a cage of a steel tower elevator. A door B is connected to the open surface of the cage A by a hinge C. The upper pipe 1 and the lower pipe 2 are fixed to the open end side 4 of the cage A with an appropriate distance apart on the same axis. A middle pipe 5 is fixed to the free end side 3 of the door B corresponding to the open end side 4, and when the door is closed, the middle pipe 5 is inserted between the upper and lower pipes 1 and 2 and is on the same axis. It is possible to position it. The lock pin 6 has a stepped small diameter part 6a in the center and can move up and down within a certain distance within the upper pipe.For this purpose, a vertical slit 1a is provided in the upper pipe 1.
The tip of a screw 6b passing through this is screwed into the lock pin 6 in the radial direction. The screw 6b is provided with a key-shaped notch (not shown) in the slit 1a so that it can be locked at the upper limit of the slit 1a. As a result, the screw 6b
When the slit 1a is locked, the lower end of the lock pin 6 is housed in the upper pipe 1, allowing the middle pipe 5 to be inserted and removed, and when the slit 1a is at the lower limit, the lower end of the lock pin 6 passes through the middle pipe 5. The lock pin can be inserted into the lower pipe 2, and at this time, the middle pipe 5 and the small diameter portion 6a of the lock pin are at the same height. The door B is always biased to open outward, and a spring device D is provided for this purpose. The spring device D includes a sleeve 7, a push pin 8 which is slidable inside the sleeve, and a push pin 8 which is located at the bottom of the sleeve and which is always connected to the sleeve 7.
The sleeve 7 has a slit 7a having a predetermined length in the axial direction, and one end of a stop pin 8a passing through the slit 7a is fixed to the push pin 8. The sleeve 7 is fixed near the edge 4 of the cage, and the protruding push pin 8 can come into contact with the edge 3 of the door, so as to constantly push the door out of the closed position.

Note that the upper and lower pipes and the middle pipe can be attached to either the door or the cage, respectively.

The present invention is constructed as described above. The worker who has entered the cage closes the door against the spring, and in this state turns the screw 6b to push down the lock pin 6 so that the small diameter part of the lock pin corresponds to the middle pipe. When the worker leaves the door and begins the next task, the door moves in the opening direction due to the spring, and the upper end of the small diameter portion of the lock pin engages with the lower end of the upper pipe and is automatically locked. When opening the door, first open the middle pipe 5, then open the upper and lower pipes 1 and 2.
The lock is released by slightly pushing the door in the closing direction so that it is located on the axis of the door. Next, when the screw 6b is pulled up and locked in the upper end notch, the lock pin is removed from the middle pipe and the door is unclosed.

Since conventional lock pins were straight, vibrations caused by the movement of the cage up and down caused them to float up and cause the lock to be automatically released. However, in the present invention, since the door is biased in the outward opening direction by the spring, the upper end of the small diameter portion of the lock pin is locked to the lower end of the upper pipe due to slight eccentricity, and there is no fear that the lock pin will automatically come out.
That is, when the door is locked with the lock pin, it is automatically locked by the small diameter portion of the lock pin, resulting in a double lock and ensuring safety. Since the door is always open when it is unlocked, the fact that it is easy to identify also contributes to safety.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the cage, Figure 2 is an illustration of the relationship between the upper, middle and lower pipes when the door is open and Figure 3 is closed, and Figure 4 is a front view of the spring device. It is. A...Cage, B...Door, C...Hinge, D...
Spring device, 1... upper pipe, 1a... slit,
2...Lower pipe, 3, 4...End side, 5...Middle pipe, 6...Lock pin, 6a...Stepped small diameter part, 6
b...screw, 7...sleeve, 7a...slit, 8...push pin, 8a...stop pin, 9
...Spring.

Claims (1)

[Scope of utility model registration request] A door that is hinged to the open side of the cage and always urged to open outward by an attached spring, an upper and lower pipe fixed to the edge of the open side of the cage, and an upper and lower pipe fixed to the free edge of the door when the door is closed. It consists of a middle pipe that can be positioned on the same axis as the middle pipe, and a lock pin that has a small diameter part in the center and can be raised and lowered along a vertical slit cut in the upper pipe and can be locked on the upper end of the slit. A safety door for a cage, characterized in that the lock pin separates from the middle pipe when it is at the upper limit, and the small diameter part of the lock pin is in a position corresponding to the middle pipe when it is at the lower limit.