A foldable elevator pit ladder

Abstract

The present invention is a foldable elevator pit ladder comprising a ladder frame assembly, a plurality of folding structural assemblies disposed on both sides of the ladder frame assembly, and a safety switch assembly disposed on one of the folding structural assemblies. The ladder frame assembly includes a handrail and a plurality of tread rollers. The folding structural assembly comprises a connecting rod, a base, a first pin, and a second pin. One end of the connecting rod is hinged to the outer wall of the handrail via the first pin, and the other end is hinged to the base via the second pin. The safety switch assembly comprises a UKS switch, which is fixed to the outer wall of the base. An arc-shaped notch is provided at the edge of the second pin, where the connecting rod is hinged to the base. The trigger end of the UKS switch is disposed within the arc-shaped notch. The present invention can be folded without interfering with landing door sills, and can accommodate elevators with most door opening and hoistway sizes. Equipped with a UKS switch, it has excellent safety performance and is highly feasible, without affecting the existing hoistway layout. The structure and processing technology are simple.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator pit components, and in particular to a foldable elevator pit ladder. Background Art

[0002] With the rapid development of the elevator industry, more communities and individuals have installed elevators. While elevators bring convenience to people, elevator safety accidents also occur frequently. Summary of the Invention

[0003] The present invention provides a foldable elevator pit ladder for better performing operations in a pit.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] A foldable elevator pit ladder comprises a ladder frame assembly, a plurality of folding structure assemblies arranged on both sides of the ladder frame assembly, and a safety switch assembly arranged on one of the folding structure assemblies;

[0006] The ladder frame assembly includes handrails on the left and right sides and several tread rollers installed between the handrails on both sides;

[0007] The folding structure assembly includes a connecting rod, a base, a first pin and a second pin, wherein one end of the connecting rod is hinged to the outer side wall of the armrest through the first pin and the other end is hinged to the base through the second pin;

[0008] The safety switch assembly includes a UKS switch, which is fixed on the outer wall of the base. An arc-shaped notch is provided at the edge of the second pin shaft where the connecting rod is hinged to the base, and the trigger end of the UKS switch is arranged in the arc-shaped notch.

[0009] The first pin shaft includes two first end plates, a first pin shaft rod is provided between the two first end plates, an anti-rotation cut surface is provided on the side wall of the first pin shaft rod, an intermediate partition is fixed to the middle of the first pin shaft rod, the first pin shaft rod is passed through the handrail and the connecting rod, the handrail is clamped between one of the first end plates and the intermediate partition, and the connecting rod is clamped between the other first end plate and the intermediate partition;

[0010] One end of the connecting rod connected to the outer side wall of the handrail is provided with a gourd hole, and the first pin shaft rod is passed through the gourd hole.

[0011] The second pin shaft includes two second end plates and a second pin shaft rod connected between the two second end plates. One end of the connecting rod connected to the base is provided with a circular hole, and the second pin shaft rod is passed through the circular hole.

[0012] The base is an L-shaped structure consisting of a connecting plate and a contact plate, wherein the connecting plate and the connecting rod are hinged by a second pin shaft, the UKS switch is fixed on the outside of the connecting plate, and the contact plate is provided with a mounting hole for docking with the wall.

[0013] An extension plate is provided on one side of the connection plate where the UKS switch is installed.

[0014] The handrail is a U-shaped structure consisting of a middle vertical plate and two side vertical plates. The middle vertical plate is 40mm wide and 3mm thick, and the two side vertical plates are 15mm wide and 3mm thick. The width of the tread roller is ≥300mm, and the cross-sectional size is 30mm×30mm.

[0015] When the connecting rod and the handrail are opened at 90 degrees, the distance between the rear side of the tread roller and the wall is 240mm.

[0016] The beneficial effects of the present invention are: the present invention can be folded, will not interfere with the floor door sill, and can adapt to elevators with most door opening sizes and shaft sizes; it is equipped with a UKS switch and has good safety performance; the solution is easy to implement and does not affect the original shaft layout; the structure and processing technology are simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 is a schematic diagram of the folding structure assembly without the safety switch assembly installed;

[0019] Figure 3 A schematic diagram of a folding structure assembly with a safety switch assembly installed;

[0020] Figure 4 is a structural diagram of the connecting rod;

[0021] Figure 5 Schematic diagram of the structure of the first pin;

[0022] Figure 6 Schematic diagram of the structure of the second pin;

[0023] Figure 7 It is a usage state diagram of the present invention;

[0024] In the figure: 1- ladder frame assembly; 2- folding structure assembly; 3- safety switch assembly;

[0025] 101-handrail; 102-tread roller;

[0026] 201-connecting rod; 202-base; 203-first pin; 204-second pin; 205-gourd hole; 206-round hole;

[0027] 2021-connecting plate; 2022-contact plate; 2023-mounting hole; 2024-extension plate;

[0028] 2031-first end plate; 2032-first pin rod; 2033-anti-rotation cut surface; 2034-middle partition;

[0029] 2041-second end plate; 2042-second pin rod;

[0030] 301-UKS switch; 302-arc notch;

[0031] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention. The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in exact proportions. They are only used to facilitate and clearly illustrate the purpose of the embodiments of the present invention.

[0033] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The present invention will be further described below with reference to the accompanying drawings and examples:

[0036] like Figures 1 to 6 As shown, a foldable elevator pit ladder includes a ladder frame assembly 1, a plurality of folding structure assemblies 2 arranged on both sides of the ladder frame assembly 1, and a safety switch assembly 3 arranged on one of the folding structure assemblies 2.

[0037] The ladder frame assembly 1 includes left and right handrails 101 and a plurality of tread rollers 102 installed between the handrails 101 on both sides;

[0038] The ladder frame assembly 1 primarily consists of a tread roller 102 and a handrail 101. The tread roller 102 is fabricated from square tubing, ensuring a width that meets standard requirements and provides performance, allowing for comfortable support for the worker's feet. The handrail 101 is formed by bending cold-rolled steel sheet, providing a convenient grip for the worker. The ladder frame assembly 1 is formed by welding the tread roller 102 and handrail 101 together, followed by rust-proofing and aesthetic treatment.

[0039] The folding structure assembly 2 includes a connecting rod 201, a base 202, a first pin 203 and a second pin 204. One end of the connecting rod 201 is hinged to the outer wall of the armrest 101 through the first pin 203 and the other end is hinged to the base 202 through the second pin 204.

[0040] The first pin 203 includes two first end plates 2031, with a first pin rod 2032 disposed between the two first end plates 2031. The sidewall of the first pin rod 2032 is provided with an anti-rotation cut surface 2033. A middle partition 2034 is fixed to the middle of the first pin rod 2032. The first pin rod 2032 passes through the handrail 101 and the connecting rod 201. The handrail 101 is sandwiched between one of the first end plates 2031 and the middle partition 2034, and the connecting rod 201 is sandwiched between the other first end plate 2031 and the middle partition 2034.

[0041] A calabash hole 205 is provided at one end of the connecting rod 201 connected to the outer wall of the handrail 101 , and the first pin shaft rod 2032 is passed through the calabash hole 205 .

[0042] The second pin shaft 204 includes two second end plates 2041 and a second pin shaft rod 2042 connected between the two second end plates 2041 . A circular hole 206 is provided at one end of the connecting rod 201 connected to the base 202 , and the second pin shaft rod 2042 is passed through the circular hole 206 .

[0043] The base 202 is an L-shaped structure consisting of a connecting plate 2021 and a contact plate 2022, wherein the connecting plate 2021 is hinged to the connecting rod 201 through a second pin 204, the UKS switch 301 is fixed on the outside of the connecting plate 2021, and the contact plate 2022 is provided with a mounting hole 2023 for docking with the wall.

[0044] The connecting rod 201 is machined from 4mm steel plate. The end closest to the wall is a circular hole 206, which is only used for rotation. The end closest to the handrail 101 is a gourd hole 205, which is used for rotation when opened and fixation when folded. The first pin 2032 is machined from round steel, and an anti-rotation cut surface 2033 is cut on the working circular surface. It is used in conjunction with the gourd hole 205 of the connecting rod 201. When the ladder needs to be folded, the first pin 2032 will fall along the oblong portion of the gourd hole 205 and get stuck through the anti-rotation cut surface 2033, playing a fixing role. When the ladder needs to be opened, the ladder frame is manually lifted up, and the first pin 2032 is raised to the large circular hole of the gourd hole 205 to rotate the connecting rod 201.

[0045] The base 202 can connect and fix the connecting rod 201 to the wall.

[0046] The safety switch assembly 3 includes a UKS switch 301 , which is fixed to the outer wall of the base 202 . An arc-shaped notch 302 is provided at the edge of the second pin 204 hinged between the connecting rod 201 and the base 202 , and the trigger end of the UKS switch 301 is arranged in the arc-shaped notch 302 .

[0047] An extension plate 2024 is provided on one side of the connection plate 2021 on which the UKS switch 301 is mounted.

[0048] The UKS switch 301 is a normally closed switch. When the ladder's connecting rod 201 is opened, the second pin 204 rotates, and its arc-shaped notch 302 toggles the UKS switch 301, causing it to open. The UKS switch 301 is connected in series to the safety circuit, which disconnects the elevator. This ensures that the elevator remains stationary when the ladder is open, preventing the risk of the elevator car moving and damaging the ladder or even hitting maintenance personnel.

[0049] The handrail 101 is formed by bending a 3mm thick cold-rolled steel plate. The handrail 101 is a U-shaped structure consisting of a middle vertical plate and two side vertical plates. The width of the middle vertical plate is 40mm and the width of the two side vertical plates is 15mm. The tread roller 102 is made of a 30mm×30mm square tube with a width ≥300mm.

[0050] When the connecting rod 201 and the handrail 101 are opened at 90 degrees, the distance between the rear side of the step roller 102 and the wall is 240 mm.

[0051] When the present invention is used, Figure 7As shown, the ladder can be placed ≤ 600mm from the edge of the landing door entrance, and the vertical distance between the end of the handrail 101 and the sill must be ≥ 1.1m, making it easy for workers to access it. When the ladder is open, the distance between the rear of the tread roller 102 and the wall reaches 240mm, ensuring that pit workers can stand on the ladder stably. When the ladder is closed, it only occupies the width of the ladder frame of 40mm in the hoistway, without affecting the opening of the landing door or the movement of the car.

[0052] The present invention is foldable and will not interfere with the floor door sill, and can adapt to elevators with most door opening sizes and hoistway sizes; it meets the latest requirements of the new national standard for pit ladders; it is equipped with UKS switch 301 and has good safety performance; the solution is easy to implement and does not affect the original hoistway layout; the structure and processing technology are simple, and the materials used are all commonly used materials for elevators.

[0053] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or they are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A foldable elevator pit ladder, characterized in that: It comprises a ladder frame assembly (1), a plurality of folding structure assemblies (2) arranged on both sides of the ladder frame assembly (1), and a safety switch assembly (3) arranged on one of the folding structure assemblies (2); The ladder frame assembly (1) includes left and right handrails (101) and a plurality of step rollers (102) installed between the handrails (101) on both sides. The handrails (101) are formed by bending 3mm thick cold-rolled steel plates. The folding structure assembly (2) comprises a connecting rod (201), a base (202), a first pin (203) and a second pin (204); one end of the connecting rod (201) is hinged to the outer wall of the armrest (101) via the first pin (203) and the other end is hinged to the base (202) via the second pin (204); The first pin shaft (203) includes two first end plates (2031), a first pin shaft rod (2032) is provided between the two first end plates (2031), an anti-rotation cut surface (2033) is provided on the side wall of the first pin shaft rod (2032), an intermediate partition plate (2034) is fixed to the middle of the first pin shaft rod (2032), the first pin shaft rod (2032) is passed through the handrail (101) and the connecting rod (201), the handrail (101) is clamped between one of the first end plates (2031) and the intermediate partition plate (2034), and the connecting rod (201) is clamped between the other first end plate (2031) and the intermediate partition plate (2034); a gourd hole (205) is provided at one end of the connecting rod (201) connected to the outer wall of the handrail (101), and the first pin shaft rod (2032) is passed through the gourd hole (205); The second pin shaft (204) includes two second end plates (2041) and a second pin shaft rod (2042) connected between the two second end plates (2041); a circular hole (206) is provided at one end of the connecting rod (201) connected to the base (202); and the second pin shaft rod (2042) is inserted into the circular hole (206); The base (202) is an L-shaped structure composed of a connecting plate (2021) and a contact plate (2022), wherein the connecting plate (2021) and the connecting rod (201) are hinged via a second pin (204), the UKS switch (301) is fixed to the outside of the connecting plate (2021), and the contact plate (2022) is provided with a mounting hole (2023) for docking with a wall. The safety switch assembly (3) includes a UKS switch (301), which is a normally closed switch. The UKS switch (301) is fixed to the outer wall of the base (202). An arc-shaped notch (302) is provided at the edge of the second pin shaft (204) hinged between the connecting rod (201) and the base (202). The trigger end of the UKS switch (301) is arranged in the arc-shaped notch (302). The UKS switch (301) is connected in series to the safety circuit.

2. A foldable elevator pit ladder according to claim 1, characterized in that: An extension plate (2024) is provided on one side of the connection plate (2021) on which the UKS switch (301) is installed.

3. The foldable elevator pit ladder according to claim 2, characterized in that: The handrail (101) is a U-shaped structure consisting of a middle vertical plate and two side vertical plates, wherein the middle vertical plate has a width of 40 mm and a thickness of 3 mm, and the two side vertical plates have a width of 15 mm and a thickness of 3 mm; the width of the step roller (102) is ≥300 mm, and the cross-sectional size is 30 mm×30 mm.

4. The foldable elevator pit ladder according to claim 3, characterized in that: When the connecting rod (201) and the handrail (101) are opened at 90°, the distance between the rear side of the step roller (102) and the wall is 240 mm.

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