A folding ladder with handrails

Abstract

A folding ladder with handrails comprises a ladder body and a handrail structure. The ladder body comprises two front leg tubes, two rear leg tubes, a folding step structure, an inverted U-shaped support and several rear cross beams. The handrail structure comprises two handrail components. The two handrail components are symmetrically arranged on the left and right sides of the ladder body. The handrail component comprises a fixed rod, a rotating rod and a handrail rod. One end of the fixed rod is fixedly connected with the outer side wall of the rear leg tube. The other end of the fixed rod extends upward and the extending direction is consistent with the rear leg tube. One end of the rotating rod is hingedly connected with the outer side wall of the front leg tube. The handrail rod is hingedly connected between the fixed rod and the rotating rod. When the ladder body is completely unfolded, the handrail rod is parallel to the front leg tube, and the rotating rod is parallel to the fixed rod. The handrail structure of the utility model can be automatically folded and unfolded with the ladder body, and the user does not need to manually operate the handrail structure, so that the folding and unfolding process of the handrail structure is more quick and convenient.

Description

Technical Field

[0001] This utility model relates to the field of ladder technology, specifically a folding ladder with handrails. Background Technology

[0002] A folding ladder typically consists of two front leg tubes, two rear leg tubes, a folding mechanism for the steps that rotatably connect the two front and two rear leg tubes, an inverted U-shaped bracket fixedly connected between the top ends of the two front leg tubes, and several rear crossbeams fixedly connected between the two rear leg tubes. When the top step of the folding mechanism is engaged with the top rear crossbeam, the folding ladder fully rotates and unfolds. At this point, the angle between the rear and front leg tubes is generally around 35°.

[0003] The applicant previously applied for and was granted a utility model patent with authorization announcement number CN207960474U, which discloses a foldable handrail structure for a ladder. The structure includes a handrail tube, two handrail tube support tubes, two support tube fixing parts, and a locking structure. The upper and lower ends of the handrail tube are respectively hinged to the front ends of the two handrail tube support tubes, and the rear ends of the two handrail tube support tubes are respectively hinged to the front ends of the two support tube fixing parts. The rear ends of the two support tube fixing parts are fixed to the front legs of the ladder. The locking structure includes a locking ring, a spring, a locking buckle, and a plastic spring buckle. The locking ring is located in front of the handrail tube and connected to the front end of the locking buckle. The plastic spring buckle is fixedly fitted inside the front end of the handrail tube support tube. A spring hole is provided at the center of the plastic spring buckle along its center line. The rear end of the locking buckle passes through the handrail tube from front to back, and its round head structure engages with the spring hole on the plastic spring buckle. This utility model greatly reduces the labor intensity of existing fixed handrail structures, requiring only one assembly. In use, simply pull the handrail tube outward, and the latch will automatically spring into the spring hole under the action of the spring, preventing it from closing and playing a locking role. It can be used immediately after opening, which is convenient. When storing, simply pull the latch ring to unlock and push it upward to close it, saving storage space and being convenient and practical.

[0004] However, after the ladder is unfolded, the handrail structure still requires manual operation to unfold, and similarly, before the ladder is folded, the handrail structure also needs to be folded manually. The folding and unfolding process of the handrail structure is still not quick and convenient enough, and there is still room for improvement.

[0005] Therefore, this utility model proposes a technical solution to address the problem that the folding and unfolding process of the aforementioned handrail structure is still not quick and convenient enough, and there is still room for improvement. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a folding ladder with a handrail, which aims to achieve the technical effect that the handrail structure automatically folds and unfolds with the ladder body, eliminating the need for manual operation of the handrail structure by the user, and making the folding and unfolding process of the handrail structure faster and more convenient.

[0007] A folding ladder with handrails includes a ladder body and a handrail structure. The ladder body includes two front leg tubes, two rear leg tubes, a folding platform structure, an inverted U-shaped bracket fixedly connected between the top ends of the two front leg tubes, and several rear crossbeams fixedly connected between the two rear leg tubes. The handrail structure includes two handrail components symmetrically arranged on the left and right sides of the ladder body. Each handrail component includes a fixed rod, a rotating rod, and a handrail bar. One end of the fixed rod is fixedly connected to the outer wall of the rear leg tube, and the other end of the fixed rod extends upward in the same direction as the rear leg tube. One end of the rotating rod is hinged to the outer wall of the front leg tube. The handrail bar is hinged between the fixed rod and the rotating rod. When the ladder body is fully unfolded, the handrail bar is parallel to the front leg tubes, and the rotating rod is parallel to the fixed rod.

[0008] By adopting the above technical solution, when the ladder body is rotated and unfolded, the rotation of the front leg tubes drives the rotating rod to rotate. The rotating rod then drives the handrail to rotate between the rotating rod and the fixed rod, moving away from the ladder body, thus automatically unfolding the entire handrail assembly. At this time, the handrail is parallel to the front leg tubes, and the rotating rod is parallel to the fixed rod. The parallelism of the handrail to the front leg tubes makes it easier for the user to grip the handrail. Furthermore, since the angle between the rear leg tubes and the front leg tubes is generally an acute angle of 35° when the ladder body is fully rotated and unfolded, and the parallelism of the handrail to the front leg tubes and the rotating rod to the fixed rod ensures that the angle between the fixed rod and the handrail is acute, the angle between the handrail and the rotating rod is obtuse, and the angle between the rotating rod and the front leg tube is acute. This facilitates the automatic folding of the handrail assembly when the ladder body is rotated and folded. The handrail structure of this invention can automatically fold and unfold with the ladder body, eliminating the need for manual operation and making the folding and unfolding process faster and more convenient.

[0009] A further feature of this invention is that both the handrail and the inverted U-shaped bracket are fitted with rubber sleeves.

[0010] By adopting the above technical solution, the rubber sleeve improves the comfort of users when holding the handrail and the inverted U-shaped support.

[0011] A further feature of this invention is that a tool tray located above the pedal folding structure is rotatably connected between the two front leg tubes via a pin. A positioning rod is fixed on one side of each of the two front leg tubes. A positioning plate corresponding to the positioning rod is provided on the tool tray. When the positioning plate is engaged with the positioning rod, the tool tray is in a horizontal state.

[0012] By adopting the above technical solution, after the ladder body is rotated and unfolded, the user can manually rotate the tool tray downwards until the positioning plate is locked on the positioning rod. At this point, the tool tray is locked and cannot be rotated downwards, keeping the tool tray in a horizontal position, and the user can place tools on the tool tray.

[0013] A further feature of this invention is that protrusions are fixed on the outer walls of both the left and right sides of the tool tray. The length of the protrusions is greater than the interval between the outer wall of the tool tray and the inner wall of the inverted U-shaped bracket. The end of the protrusion facing away from the tool tray is set as an arc-shaped curved surface.

[0014] By adopting the above technical solution, after the ladder body is rotated and folded, the user can manually rotate the tool tray upwards, so that the tool tray is located inside the inverted U-shaped bracket, and the protrusion is pressed against the inner wall of the inverted U-shaped bracket, thereby maintaining the stability of the tool tray when it is located inside the inverted U-shaped bracket.

[0015] A further feature of this invention is as follows: the bottom end of the top pedal in the pedal folding structure is provided with a safety buckle structure for fastening onto the top rear crossbeam. The safety buckle structure includes a rotating plate, a torsion spring, a shaft, and two fixed seats. Both fixed seats are fixed to the bottom end of the top pedal. The shaft is fixedly connected between the two fixed seats. Two rotating seats are fixed to the top end of the rotating plate. The top ends of the two rotating seats are rotatably sleeved on the outside of the shaft. A hook plate for hooking onto the top rear crossbeam is fixed to the bottom end of the rotating plate. The hook plate is provided with an inclined surface corresponding to the top rear crossbeam. The torsion spring is sleeved on the outside of the shaft, and its two torsion arms are respectively locked onto the bottom end of the top pedal and the top end of the rotating plate.

[0016] By adopting the above technical solution, after the ladder body is rotated and unfolded, the rotation of the top step causes the safety latch structure to move downwards. The inclined surface presses against the top rear crossbeam. Under pressure, the inclined surface causes the hook plate and rotating plate to rotate upwards around the axis via the rotating seat. Simultaneously, the torsion spring deforms and generates a rebound force. When the inclined surface separates from the top rear crossbeam, the hook plate and rotating plate rotate back to their original position under the rebound force of the double torsion springs. The hook plate hooks onto the top rear crossbeam, thus automatically fixing the top step to the top rear crossbeam via the safety latch structure after the ladder body is rotated and unfolded, improving the stability of the top step and preventing it from tilting upwards. Similarly, when the ladder body needs to be rotated and folded, the user first rotates the rotating plate upwards to separate the hook plate from the top rear crossbeam.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. A folding ladder with a handrail. The handrail structure of this utility model can automatically fold and unfold with the ladder body, eliminating the need for manual operation of the handrail structure by the user. The folding and unfolding process of the handrail structure is faster and more convenient.

[0019] 2. When the ladder body is unfolded, rotating the tool tray downwards will keep the tool tray stable and horizontal; when the ladder body is folded, rotating the tool tray upwards will keep the tool tray stable and within the inverted U-shaped bracket.

[0020] 3. After the ladder body is rotated and unfolded, the top step is automatically fixed to the rear crossbeam at the top by a safety buckle structure, which improves the stability of the top step and prevents it from tilting upwards. Rotating the rotating plate upwards will release the safety buckle knot; the process of releasing the safety buckle knot is quick and easy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a folding ladder with handrail according to the present invention. Figure 1 ;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0024] Figure 4 This is a schematic diagram of the structure of a folding ladder with handrail according to the present invention. Figure 2 ;

[0025] Figure 5 for Figure 4 Enlarged view of point C in the middle;

[0026] Figure 6 This is a partial structural diagram of a safety buckle structure for a folding ladder with handrail according to the present invention.

[0027] Reference numerals: 1. Front leg tube; 2. Rear leg tube; 3. Pedal folding structure; 4. Inverted U-shaped bracket; 5. Rear crossbeam; 6. Fixed rod; 7. Rotating rod; 8. Handrail rod; 9. Positioning rod; 10. Positioning plate; 11. Protrusion; 12. Rotating plate; 13. Torsion spring; 14. Shaft; 15. Fixed seat; 16. Rotating seat; 17. Hook plate; 18. Inclined surface; 19. Tool tray. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] A folding ladder with handrails, such as Figures 1-6 As shown, the ladder includes a ladder body, a tool tray 19, a handrail structure, and a safety latch structure. The ladder body includes two front leg tubes 1, two rear leg tubes 2, and a folding footplate structure 3. An inverted U-shaped bracket 4 is fixedly connected between the top ends of the two front leg tubes 1. Several rear crossbeams 5 are fixedly connected between the two rear leg tubes 2.

[0030] The ladder itself is a mature existing technology and will not be described in detail here. For reference, this embodiment can be found in the relevant description in Chinese Patent No. CN218581543U, "A Height-Adjustable Folding Ladder".

[0031] The handrail structure includes two handrail components. These two handrail components are symmetrically arranged on the left and right sides of the ladder body. Each handrail component includes a fixed rod 6, a rotating rod 7, and a handrail 8. One end of the fixed rod 6 is fixedly connected to the outer wall of the rear leg tube 2. The other end of the fixed rod 6 extends upwards in the same direction as the rear leg tube 2. One end of the rotating rod 7 is hinged to the outer wall of the front leg tube 1. The handrail 8 is hinged between the fixed rod 6 and the rotating rod 7. When the ladder body is fully extended, the handrail 8 is parallel to the front leg tube 1, and the rotating rod 7 is parallel to the fixed rod 6.

[0032] The tool tray 19 is rotatably connected between two front leg tubes 1 via a pin and is located above the pedal folding structure 3. Positioning rods 9 are fixed to opposite sides of each of the two front leg tubes 1. Positioning plates 10 corresponding to the positioning rods 9 are provided on the tool tray 19. When the positioning plates 10 are engaged with the positioning rods 9, the tool tray 19 is in a horizontal position. Protrusions 11 are fixed to the outer walls of both the left and right sides of the tool tray 19. The length of the protrusions 11 is greater than the distance between the outer wall of the tool tray 19 and the inner wall of the inverted U-shaped bracket 4. The end of the protrusion 11 facing away from the tool tray 19 is designed as an arc-shaped curved surface.

[0033] A safety latch structure is located at the bottom end of the top pedal in the pedal folding structure 3, and is used to fasten to the top rear crossbeam 5. The safety latch structure includes a rotating plate 12, a torsion spring 13, a shaft 14, and two fixed seats 15. Both fixed seats 15 are fixed to the bottom end of the top pedal. The shaft 14 is fixedly connected between the two fixed seats 15. Two rotating seats 16 are fixed to the top end of the rotating plate 12. The top ends of the two rotating seats 16 are rotatably sleeved on the outside of the shaft 14. A hook plate 17 for hooking the top rear crossbeam 5 is fixed to the bottom end of the rotating plate 12. The hook plate 17 is provided with an inclined surface 18 corresponding to the top rear crossbeam 5. The torsion spring 13 is sleeved on the outside of the shaft 14, and its two ends of the torsion arm are respectively locked at the bottom end of the top pedal and the top end of the rotating plate 12.

[0034] Additionally, both the handrail 8 and the inverted U-shaped bracket 4 are fitted with rubber sleeves. The rubber sleeves improve the comfort of users when gripping the handrail 8 and the inverted U-shaped bracket 4.

[0035] Working Principle: When the ladder body is rotated and unfolded, the rotation of the top step causes the safety latch structure to move downwards. The inclined surface 18 presses against the top rear crossbeam 5. Under pressure, the inclined surface 18 causes the hook plate 17 and the rotating plate 12 to rotate upwards around the shaft 14 via the rotating seat 16. Simultaneously, the torsion spring 13 deforms and generates a rebound force. When the inclined surface 18 separates from the top rear crossbeam 5, the hook plate 17 and the rotating plate 12 rotate back to their original positions under the rebound force of the double torsion springs 13. The hook plate 17 hooks onto the top rear crossbeam 5, thus automatically fixing the top step to the top rear crossbeam 5 via the safety latch structure after the ladder body is fully rotated and unfolded, improving the stability of the top step and preventing it from tilting upwards. Similarly, when the ladder body needs to be rotated and folded, the user first rotates the rotating plate 12 upwards to separate the hook plate 17 from the top rear crossbeam 5.

[0036] Furthermore, when the ladder body is rotated and unfolded, the rotation of the front leg tube 1 drives the rotating rod 7 to rotate. The rotating rod 7 then drives the handrail 8 to rotate between the rotating rod 7 and the fixed rod 6, moving it away from the ladder body, thus automatically unfolding the entire handrail assembly. At this time, the handrail 8 is parallel to the front leg tube 1, and the rotating rod 7 is parallel to the fixed rod 6. The parallelism of the handrail 8 with the front leg tube 1 makes it easier for the user to grip the handrail 8. Since the angle between the rear leg tube 2 and the front leg tube 1 is generally an acute angle of 35° when the ladder body is fully rotated and unfolded, and the parallelism of the handrail 8 with the front leg tube 1 and the rotating rod 7 with the fixed rod 6 ensures that the angle between the fixed rod 6 and the handrail 8 is acute, the angle between the handrail 8 and the rotating rod 7 is obtuse, and the angle between the rotating rod 7 and the front leg tube 1 is acute. This facilitates the automatic folding of the handrail assembly when the ladder body is rotated and folded. The handrail structure can automatically fold and unfold along with the ladder body, eliminating the need for manual operation by the user and making the folding and unfolding process faster and more convenient.

[0037] After the ladder body is rotated and unfolded, the user manually rotates the tool tray 19 downwards until the positioning plate 10 is engaged with the positioning rod 9. At this point, the tool tray 19 is locked and cannot be rotated further downwards, keeping the tool tray 19 in a horizontal position, allowing the user to place tools on it. After the ladder body is rotated and folded, the user manually rotates the tool tray 19 upwards, causing it to be positioned within the inverted U-shaped bracket 4. The protrusion 11 presses against the inner wall of the inverted U-shaped bracket 4, thus maintaining the stability of the tool tray 19 when it is positioned within the inverted U-shaped bracket 4.

[0038] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A folding ladder with handrails, comprising a ladder body and a handrail structure, wherein the ladder body comprises two front leg tubes (1), two rear leg tubes (2), a folding step structure (3), an inverted U-shaped bracket (4) fixedly connected between the top ends of the two front leg tubes (1), and a plurality of rear crossbeams (5) fixedly connected between the two rear leg tubes (2), characterized in that: The handrail structure includes two handrail components, which are symmetrically arranged on the left and right sides of the ladder body. Each handrail component includes a fixed rod (6), a rotating rod (7), and a handrail (8). One end of the fixed rod (6) is fixedly connected to the outer wall of the rear leg tube (2), and the other end of the fixed rod (6) extends upward in the same direction as the rear leg tube (2). One end of the rotating rod (7) is hinged to the outer wall of the front leg tube (1). The handrail (8) is hinged between the fixed rod (6) and the rotating rod (7). When the ladder body is fully extended, the handrail (8) is parallel to the front leg tube (1), and the rotating rod (7) is parallel to the fixed rod (6).

2. A folding ladder with handrail according to claim 1, characterized in that: Both the handrail (8) and the inverted U-shaped bracket (4) are fixedly fitted with rubber sleeves.

3. A folding ladder with handrail according to claim 1, characterized in that: A tool tray (19) located above the pedal folding structure (3) is rotatably connected between the two front foot tubes (1) by a pin. A positioning rod (9) is fixed on one side of each of the two front foot tubes (1). A positioning plate (10) corresponding to the positioning rod (9) is provided on the tool tray (19). When the positioning plate (10) is engaged on the positioning rod (9), the tool tray (19) is in a horizontal state.

4. A folding ladder with handrail according to claim 3, characterized in that: The tool tray (19) has protrusions (11) fixed on the outer walls of both sides. The length of the protrusions (11) is greater than the interval between the outer wall of the tool tray (19) and the inner wall of the inverted U-shaped bracket (4). The end of the protrusion (11) facing away from the tool tray (19) is set as an arc-shaped curved surface.

5. A folding ladder with handrail according to claim 1, characterized in that: The bottom end of the top pedal in the pedal folding structure (3) is provided with a safety buckle structure for fastening onto the top rear crossbeam (5). The safety buckle structure includes a rotating plate (12), a torsion spring (13), a shaft (14), and two fixed seats (15). The two fixed seats (15) are fixed to the bottom end of the top pedal. The shaft (14) is fixedly connected between the two fixed seats (15). The top end of the rotating plate (12) is fixed with two rotating... The top ends of the two rotating seats (16) are rotatably sleeved on the outside of the shaft (14). The bottom end of the rotating plate (12) is fixed with a hook plate (17) for hooking the rear crossbeam (5) at the top. The hook plate (17) is provided with an inclined surface (18) corresponding to the rear crossbeam (5) at the top. The torsion spring (13) is sleeved on the outside of the shaft (14), and its two ends of the torsion arm are respectively locked at the bottom end of the top pedal and the top end of the rotating plate (12).

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