Device for preventing construction elevator landing door from opening outward

Abstract

This invention discloses a device to prevent construction elevator landing doors from opening outwards. The device includes a fixed support, a movable baffle, a return spring, a pin, and a buffer rubber pad. The fixed support is fixed to the elevator landing door frame or the floor door support. The movable baffle is hinged to the fixed support via the pin. The return spring connects the fixed support and the movable baffle, allowing the movable baffle to normally extend obliquely and prevent the door from opening outwards via a limiting boss. When the door is pushed inwards, the movable baffle is compressed and rotates to retract, automatically returning to its original position after the door is closed. This device requires no modification to the original elevator structure, is low in cost, and is easy to install and maintain.

Description

Technical Field

[0001] This invention relates to the field of construction safety protection equipment technology, and more specifically, to a device for preventing construction elevator landing doors from opening outwards. Background Technology

[0002] Construction elevators are critical vertical transportation equipment in high-rise building construction, and the safety of their doors is directly related to the lives of workers. Currently, most common construction elevators, such as the SC type, have manually operated push-pull doors. Due to long-term use, the locking mechanism of some doors may wear down, or the doors may accidentally open outwards due to operator error or external impact. Especially when the elevator is traveling to high floors, outward-opening doors could cause people to fall, leading to accidents.

[0003] Existing anti-outward opening solutions mainly fall into two categories: one is to modify the elevator door lock mechanism and add electronic limit switches. Although this provides good protection, it is costly, requires professional installation, and alters the original elevator structure, affecting equipment maintenance; the other is to use fixed baffles, which are low-cost but require manual insertion and removal of limit pins, making operation cumbersome and prone to failure due to forgetting to reset. Therefore, there is an urgent need for a simple anti-outward opening device that does not require modification of the elevator structure, is inexpensive, easy to operate, and can automatically reset. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art. This invention provides a device to prevent construction elevator landing doors from opening outwards, which is used to prevent the elevator doors from opening accidentally outwards without affecting the normal inward opening and closing of the doors. At the same time, it does not require modification of the original elevator structure, can be adapted to common construction elevator models, can be made of reusable materials, has an automatic reset function, and is easy to operate and maintain.

[0005] The present invention adopts the following technical solution:

[0006] A device for preventing construction elevator landing doors from opening outward includes a fixed support, a movable baffle, a return spring, a pin, and a buffer rubber pad. The fixed support has a first pin hole and a mounting hole, the mounting hole being used to connect to the construction elevator frame. One end of the movable baffle has a second pin hole, and the other end is welded with a limiting boss. The pin passes through the first and second pin holes, so that the movable baffle is hinged to the fixed support. The two ends of the return spring are respectively connected to the fixed support and the movable baffle, so that the movable baffle is in a diagonally extended state under normal conditions and is blocked by the limiting boss from opening outward. The buffer rubber pad is attached to the inner side of the movable baffle where it contacts the door. When the landing door opens inward, the door squeezes the movable baffle to rotate and retract around the pin. After the door closes, the movable baffle returns to its original position under the action of the return spring.

[0007] Furthermore, the fixed support is made of L50×5×150mm angle steel, the first pin hole is an M12 pin hole and is set at 30mm from one end of the fixed support, and the mounting hole is two M8 through holes with a spacing of 80mm between the two M8 through holes.

[0008] Furthermore, the mounting holes are compatible with M8×40mm expansion bolts, and the fixed support is fixed to the elevator landing door frame or floor door column by the M8×40mm expansion bolts.

[0009] Furthermore, the movable baffle is made of flat steel with a thickness of 3mm, a width of 40mm, and a length of 200mm. The second pin hole is an M12 pin hole and is located 20mm from one end of the movable baffle. The limiting boss is formed by welding 5mm×30mm×40mm steel plates.

[0010] Furthermore, the pin is made of M12×50mm bolt and nut, which passes through the first pin hole and the second pin hole to connect the fixed support and the movable baffle.

[0011] Furthermore, the reset spring is made of φ2mm spring steel wire, with a free length of 80mm and an elastic force of 3N-8N.

[0012] Furthermore, both the fixed support and the movable baffle are welded with spring hooks, which are made of φ6mm round steel, and the two ends of the reset spring are respectively hooked to the spring hooks.

[0013] Furthermore, the buffer rubber pad is made of wear-resistant rubber material, with a thickness of 5mm and a size of 100mm×40mm, and is attached to the inside of the movable baffle with strong adhesive.

[0014] Furthermore, the movable baffle has an angle of 30° with the fixed support under normal conditions, and the limiting boss is in contact with the edge of the landing door; when the landing door opens inward, the movable baffle rotates and retracts, and the opening angle of the landing door can reach 90°; after the landing door is closed, the movable baffle resets within 1 second.

[0015] Furthermore, the limiting end of the movable baffle faces the outside of the landing door and is installed at a height of 1.2m above the ground, so that the landing door can only open to the inside of the floor and cannot open to the outside.

[0016] When the door is made of aluminum alloy, a 3mm thick steel plate lining is provided at the edge position where the door contacts the movable baffle, and the steel plate lining is fixed by rivets.

[0017] Beneficial effects

[0018] The automatic reset limit structure of this invention can prevent the door from opening outward in real time, and the buffer rubber pad reduces collision damage; it does not require modification of the original elevator structure, and can be adapted to common construction elevators by adjusting the installation position; it is made of construction site turnover materials such as angle steel and flat steel, so the cost is low; there is no need to manually operate the limit component, the door opens and closes smoothly, and only a simple check is required before each shift, so the maintenance cost is low. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention installed on the car door.

[0020] Figure 2 This is a schematic diagram illustrating the working principle of an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] As shown in the figure, this embodiment of the invention provides a device to prevent construction elevator landing doors from opening outwards, including a fixed support 1, a movable baffle 2, a return spring 3, a pin 4, and a buffer rubber pad 5. The fixed support 1 is fixed to the landing door frame 9 or the floor door column by expansion bolts 6. The movable baffle 2 is hinged to the fixed support 1 by the pin 4. The return spring 3 connects the fixed support 1 and the movable baffle 2. The buffer rubber pad 5 is located on the inner side of the movable baffle 2 at the contact point with the door body.

[0023] During the prefabrication of the device, take L50×5×150mm angle steel as fixed support 1, drill M12 pin hole with bench drill at 30mm from one end, and drill two M8 through holes with a spacing of 80mm at the other end. Chamfer the edges of the through holes to remove burrs.

[0024] Take a 3mm×40mm×200mm flat steel as the movable baffle 2, drill an M12 pin hole 20mm from one end, spot weld a 5mm×30mm×40mm steel plate at the other end as a limiting boss 21, and attach a 5mm thick rubber pad as a buffer rubber pad 5 with strong adhesive to the inside of the movable baffle 2.

[0025] Weld spring hooks 7 made of φ6mm round steel to the corresponding positions of the fixed support 1 and the movable baffle 2. Use M12×50mm bolts and nuts as pins 4 to connect the fixed support 1 and the movable baffle 2. Hook the return spring 3 onto the spring hooks 7 to ensure that the movable baffle 2 can rotate flexibly around the pins 4.

[0026] When installing the landing door, mark the installation point 1.2m above the ground on the side frame of the SC200 / 200 construction elevator landing door near the door hinge, and ensure that the distance between the device and the door frame is 10mm; then use M8×40mm expansion bolts 6 to fasten the fixed support 1 to the landing door frame 9, and tighten it to 25N·m with a torque wrench to ensure that the fixed support 1 is vertical and not loose.

[0027] During commissioning, close the landing door 8, adjust the angle of the movable baffle 2 so that the angle between the movable baffle 2 and the fixed support 1 is 30°, and make the limiting boss 21 fit tightly against the frame of the landing door 8; when pushing the door inward, check whether the movable baffle 2 retracts smoothly and the landing door 8 can open to an angle of 90°; after closing the door, the movable baffle 2 should reset within 1 second and the limiting boss 21 should re-fit the landing door 8.

[0028] During use, in the limited position, the reset spring 3 pulls the movable baffle 2 to extend at a 30° angle, and the limiting boss 21 fits against the frame of the landing door 8, preventing the landing door 8 from rotating outward; in the open position, when the door is pushed inward, the landing door 8 squeezes the movable baffle 2 to overcome the elastic force of the reset spring 3, and the movable baffle 2 rotates around the pin 4 to retract, allowing the landing door 8 to open normally; in the reset position, after the door is closed, the reset spring 3 pulls the movable baffle 2 to reset, restoring the anti-outward opening function.

[0029] When installing the landing door, install the device in reverse on the columns on both sides of the landing door, so that the limiting end of the movable baffle 2 faces the outside of the landing door 8. The installation height is 1.2m from the ground. The debugging method is the same as the landing door installation example, to ensure that the landing door cannot be opened to the outside, but can only be opened to the inside of the floor.

[0030] If the door is made of aluminum alloy, attach a 3mm thick steel plate backing to the frame where the door contacts the movable baffle 2 and secure it with rivets to enhance the frame's strength and prevent door deformation. If the door's opening resistance is too high, replace it with a 3N return spring 3 to balance ease of opening and closing with effective limiting.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. For those skilled in the art, any simple modifications, equivalent changes, or alterations made to the above embodiments without departing from the essence of the technical solution of the present invention should fall within the scope of protection of the present invention.

Claims

1. A device for preventing an outer opening of a construction elevator landing door, characterized in that, The system includes a fixed support, a movable baffle, a return spring, a pin, and a buffer rubber pad. The fixed support has a first pin hole and a mounting hole, the mounting hole being used to connect to the construction elevator frame. One end of the movable baffle has a second pin hole, and the other end is welded with a limiting boss. The pin passes through the first and second pin holes, allowing the movable baffle to be hinged to the fixed support. The return spring connects the fixed support and the movable baffle at both ends, so that the movable baffle is in a diagonally extended state under normal conditions and is blocked from opening the landing door outward by the limiting boss. The buffer rubber pad is attached to the inner side of the movable baffle where it contacts the door. When the landing door opens inward, the door compresses the movable baffle, causing it to rotate and retract around the pin. After the door closes, the movable baffle returns to its original position under the action of the return spring.

2. The device for preventing the outside opening of the landing door of a construction elevator according to claim 1, characterized in that: The fixed support is made of L50×5×150mm angle steel. The first pin hole is an M12 pin hole and is located 30mm away from one end of the fixed support. The mounting hole consists of two M8 through holes with a spacing of 80mm between them.

3. The device for preventing the outside opening of the landing door of the construction elevator according to claim 1, characterized in that: The mounting hole is compatible with M8×40mm expansion bolts, and the fixed support is fixed to the elevator landing door frame or floor door column by the M8×40mm expansion bolts.

4. The device for preventing the outside opening of the landing door of the construction elevator according to claim 1, wherein: The movable baffle is made of flat steel with a thickness of 3mm, a width of 40mm, and a length of 200mm. The second pin hole is an M12 pin hole and is located 20mm from one end of the movable baffle. The limiting boss is formed by welding 5mm×30mm×40mm steel plates.

5. The device for preventing the outside opening of the landing door of the construction elevator according to claim 1, wherein: The pin is made of M12×50mm bolt and nut, which passes through the first pin hole and the second pin hole to connect the fixed support and the movable baffle.

6. The device for preventing the outside opening of the landing door of the construction elevator according to claim 1, wherein: The reset spring is made of φ2mm spring steel wire, with a free length of 80mm and an elastic force of 3N-8N.

7. A device for preventing construction elevator landing doors from opening outwards according to claim 1 or 6, characterized in that: Both the fixed support and the movable baffle are welded with spring hooks. The spring hooks are made of φ6mm round steel, and the two ends of the return spring are respectively hooked to the spring hooks.

8. The device for preventing the outside opening of the landing door of the construction elevator according to claim 1, wherein: The buffer rubber pad is made of wear-resistant rubber, with a thickness of 5mm and a size of 100mm×40mm, and is attached to the inside of the movable baffle with strong adhesive.

9. The device for preventing the outside opening of the landing door of the construction elevator according to claim 1, wherein: The movable baffle is at a 30° angle with the fixed support under normal conditions, and the limiting boss is in contact with the edge of the landing door; when the landing door opens inward, the movable baffle rotates and retracts, and the opening angle of the landing door can reach 90°; after the landing door is closed, the movable baffle resets within 1 second.

10. The device for preventing the outside opening of the landing door of the construction elevator according to claim 1, wherein: The limiting end of the movable baffle faces the outside of the landing door and is installed at a height of 1.2m above the ground, so that the landing door can only open to the inside of the floor and cannot open to the outside. When the door is made of aluminum alloy, a 3mm thick steel plate lining is provided at the edge position where the door contacts the movable baffle, and the steel plate lining is fixed by rivets.

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