Multifunctional connecting plate and boarding ladder

Abstract

The utility model discloses a multifunctional connecting plate and a vehicle boarding ladder thereof, wherein a multifunctional connecting plate comprises: a main board body and a reinforcing board body; the main board body has an outer board surface and an inner board surface facing each other; the reinforcing board body is installed on the outer board surface of the main board body; the main board body is provided with a first positioning hole, a second positioning hole and an axial hole for passing through the main board body; the first positioning hole and the second positioning hole can be selectively inserted by a locking rod; the first positioning hole, the second positioning hole and the axial hole are located on the front side of the reinforcing board body on the main board body; the upper end of the main board body is a hole plate portion, and the lower end is a main board connecting portion; the first positioning hole, the second positioning hole and the axial hole are all located in the hole plate portion.

Description

Technical Field

[0001] The utility model relates to a hanging ladder, in particular to a multifunctional connecting plate and a hanging ladder for boarding a vehicle. The hanging ladder for boarding a vehicle can be used for loading and unloading of trucks, and can also be used for other similar occasions. Background Art

[0002] When loading and unloading goods from a vehicle, since the bottom of the vehicle compartment is at a certain height from the ground, it often requires the cooperation of multiple people to smoothly load and unload the goods. In order to improve efficiency, some people use the method of tilting ladders or flat plates to facilitate climbing, but since the ladders or flat plates are tilted and supported on the ground, there is a problem of unstable support and easy to tip over, which poses a safety hazard.

[0003] In order to solve the above problems, a car ladder has been developed. The ladder has a hook, which is locked with the gap between the side plate of the car and the floor surface of the car, and has a pedal for people to stand on. The existing car ladder solves the problem of loading and unloading goods at heights. The reliability of the connection between the ladder and the vehicle is ensured by the setting of the hook. The pedal of the ladder is either fixed and cannot be adjusted, which is inconvenient to store, or it is time-consuming and laborious to unlock and adjust, which is inconvenient to use. Utility Model Content

[0004] In view of the above-mentioned deficiencies, an object of the present utility model is to provide an adjustable foldable vehicle boarding ladder with foldable pedals, wherein the pedal folding structure of the adjustable foldable vehicle boarding ladder has reliable structural strength and is easy to switch between folding states.

[0005] In order to achieve at least one of the above purposes, the present invention adopts the following technical solutions:

[0006] A multifunctional connecting plate, comprising: a main plate body and a reinforcing plate body;

[0007] The main board body has an outer board surface and an inner board surface facing each other; the reinforcing board body is installed on the outer board surface of the main board body;

[0008] The main board body is provided with a first positioning hole, a second positioning hole and an axial hole for the main shaft to pass through; the first positioning hole and the second positioning hole can be selectively inserted by a locking rod; the first positioning hole and the second positioning hole and the axial hole are located on the front side of the reinforcing plate body on the main board body; the upper end of the main board body is the orifice plate part, and the lower end is the main board connecting part; the first positioning hole and the second positioning hole and the axial hole are all located in the orifice plate part.

[0009] Preferably, the front end of the main board body is further provided with a stopper formed by bending.

[0010] Preferably, the thickness of the reinforcing plate body is greater than the thickness of the main plate body.

[0011] Preferably, a limiting body is provided at the upper end of the reinforcing plate body; a retaining groove opening toward the rear side is provided on the limiting body; the lower end of the reinforcing plate body is a sub-plate connecting part; the sub-plate connecting part and the main plate connecting part are stacked to form an insertion connecting end.

[0012] A vehicle boarding ladder, comprising:

[0013] A ladder body having a plurality of parallel steps;

[0014] A step platform rotatably connected to the upper end of the ladder body; the step platform has a folded position and an unfolded position;

[0015] A handrail connecting the two sides of the ladder body; the handrail has an erected position and a retracted position; the handrail is rotatably connected to the main ladder rod and switches between the erected position and the retracted position by rotating;

[0016] A locking assembly operable to move laterally and having an unlocked position and a locked position;

[0017] Wherein, when the locking assembly is in the locked position, the pedal platform can be positioned in the folded position or the unfolded position; when the locking assembly is in the unlocked position, the pedal platform is allowed to switch between the folded position or the unfolded position; the upper end of the main ladder rod is fixedly connected with the multifunctional connecting plate as described above, having a first positioning hole corresponding to the unfolded position and a second positioning hole corresponding to the folded position; wherein, the second positioning hole is higher than the first positioning hole.

[0018] Preferably, the locking assembly comprises a first locking member and a second locking member that move in a transverse direction; the first locking member and the second locking member both comprise a locking rod that moves in a transverse direction; one end of the locking rod is an insertion end, and the other end is provided with a force-applying portion, and the force-applying portion receives force to push the locking rod to move in a transverse direction; the outer ends of the two locking rods are respectively inserted into the first positioning holes or the second positioning holes of the multifunctional connecting plates on both sides when in the locking position, thereby positioning the pedal platform in the unfolded position or the folded position;

[0019] The locking assembly is provided with a third elastic member between the first locking member and the second locking member; the third elastic member applies an elastic force to the first locking member and the second locking member to make them move laterally outward toward a locking position.

[0020] Preferably, the rear end of the pedal platform has a transverse groove; the locking assembly is installed in the transverse groove; the force-applying part includes a platform button fixedly connected to the inner end of the locking rod; the platform button is fixedly connected to the locking rod by a screw; the platform button generates opposite movement by force to switch from a locked position to an unlocked position.

[0021] Preferably, a limit stop rod is further provided in the transverse groove; the two limit stop rods are respectively located on the lateral sides of the platform dial button, limiting the platform dial button to reciprocate only between the two limit stop rods, and then the dead point positions touching the two limit stop rods correspond to the locked position and the unlocked position respectively.

[0022] Preferably, the handrail rod can be rotated upward until it is embedded in the retaining groove of the limiting body and is limited to be located in the upright position; when the handrail rod is rotated downward and is parallel to the main ladder rod, it is located in the retracted position.

[0023] Preferably, the boarding ladder is also provided with an insertion pin; the handrail rod is rotatably connected to the main ladder rod through a handrail shaft; the ladder body is provided with a first socket above the handrail shaft and a second socket below the handrail shaft; the first socket and the second socket are at an equal distance from the handrail shaft; when in the upright position, the insertion pin is inserted into the first socket to position the handrail rod; when in the folded position, the insertion pin is inserted into the second socket to position the handrail rod. Beneficial Effects

[0024] The utility model provides an adjustable foldable boarding ladder. For truck owners who often transport goods, using a ladder specially used for climbing can not only improve the efficiency of cargo loading and unloading, but also greatly improve the safety of climbing. The adjustable foldable boarding ladder has a multifunctional connecting plate, and the pedal platform connected to it can be flipped and folded to reduce storage space. The adjustable legs are retractable and can meet the needs of vehicles of different heights.

[0025] With reference to the following description and the accompanying drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope.

[0026] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0027] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 This is a schematic diagram of the structure of a multifunctional connecting plate of an embodiment of the utility model;

[0030] Figure 2 yes Figure 1 Another view of;

[0031] Figure 3 yes Figure 1 Another view of;

[0032] Figure 4 Is adopted Figure 1 A schematic diagram of the locking assembly structure of the multifunctional connecting plate;

[0033] Figure 5 This is a schematic diagram of the structure of a vehicle-mounted hanging ladder in an unfolded state provided by an embodiment of the utility model;

[0034] Figure 6 yes Figure 5 A schematic diagram of the structure in a folded state;

[0035] Figure 7 yes Figure 5 A schematic diagram of the locking assembly structure;

[0036] Figure 8 yes Figure 5 A schematic diagram of a multifunctional connecting plate and its connecting structure;

[0037] Fig. 9 yes Figure 6 A schematic diagram of the locking assembly structure;

[0038] Fig.10 yes Figure 5 Another multifunctional connecting plate and a schematic diagram of its connecting structure;

[0039] Fig.11 yes Figure 6 A schematic diagram of the structure of a multifunctional connecting plate;

[0040] Fig.12 yes Figure 7 Schematic diagram of some structures;

[0041] Fig.13 yes Fig.12 Schematic diagram of the locking rod structure. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0045] like Figures 1 to 13 An embodiment of the utility model provides an adjustable foldable vehicle ladder, which comprises: a ladder body 1 having a plurality of parallel steps 12, and a step platform 2 which is flippably and foldably connected to the upper end of the ladder body 1. The front end of the step platform 2 is provided with a hook, and the rear end 21 is rotatably connected to the ladder body 1.

[0046] The pedal platform 2 has a folded position (such as Figure 2 ) and the expanded position (as Figure 1As shown); the locking assembly can be manipulated to move laterally and has an unlocked position and a locked position. When the locking assembly is in the locked position, the step platform 2 can be positioned in the folded position or the unfolded position; when the locking assembly is in the unlocked position, the step platform 2 can be switched between the folded position and the unfolded position. The ladder body 1 includes ladder legs arranged in parallel, and a multi-step 12 located between the two ladder legs. The ladder legs include a main ladder rod and an adjustable leg rod 15 slidably mounted on the main ladder rod 11. A foot shell assembly 50 is provided at the lower end of the adjustable leg rod 15; the foot shell assembly 50 includes a foot shell 51 fixedly connected to the lower end of the adjustable leg rod 15 and a tread plate 52 arranged on the foot shell 51.

[0047] It should be noted that the front, rear, left, right, top and bottom positions of the utility model are based on the positions of the hanging ladder in normal use. For example, the end of the pedal platform 2 where the hook is located is the front end, and correspondingly, the end of the pedal platform 2 connected to the ladder body 1 is the rear end 21; the left and right directions are based on the left and right directions when the user climbs the ladder, which is also the horizontal direction in this embodiment.

[0048] In this embodiment, the step platform 2 is folded by turning over at the upper end of the ladder body 1, and when the locking and unlocking of the locking assembly are coordinated, the step platform 2 switches between the folded position and the unfolded position.

[0049] In this embodiment, the locking assembly is installed at the rear end 21 of the pedal platform 2. The locking assembly includes a first locking member and a second locking member that move in the lateral direction. The first locking member and the second locking member both include a locking rod 23 that moves in the lateral direction. The lateral direction is also the left-right direction in this specification. Among them, one end of the locking rod 23 is an insertion end, and the other end is provided with a force-applying portion. The force-applying portion receives the force and directly pushes the locking rod 23 to move in the lateral direction. The first locking member and the second locking member switch from the locked position to the unlocked position by lateral relative movement.

[0050] Specifically, the upper end of the main ladder rod 11 is fixedly connected to the multifunctional connecting plate 4, which has a first positioning hole 43 corresponding to the unfolded position and a second positioning hole 41 corresponding to the folded position. The second positioning hole 41 is higher than the first positioning hole 43. The outer ends of the two locking rods 23 are insertion ends, which are respectively inserted into the first positioning hole 43 or the second positioning hole 41 of the multifunctional connecting plate 4 on both sides when in the locked position, thereby positioning the step platform 2 in the unfolded position or the folded position. Figures 1 to 7 As shown, the two locking rods 23 are located at the folded position when inserted into the second positioning holes 41, and are located at the unfolded position when inserted into the first positioning holes 43. The inner ends of the two locking rods 23 are arranged opposite to each other. The rear end 21 of the step platform 2 is rotatably connected to the multifunctional connecting plate 4 through the main rotating shaft 28. The lower end of the multifunctional connecting plate 4 has an insertion connecting end 46, which is inserted into the upper end of the main ladder rod 11 and fixedly connected to the main ladder rod 11.

[0051] The multifunctional connecting plate 4 has a main plate body 4a and a reinforcing plate body 4b. The main plate body 4a has two opposite plate surfaces: an outer plate surface and an inner plate surface; the reinforcing plate body 4b is installed on the outer plate surface of the main plate body 4a. The main plate body 4a is provided with a first positioning hole 43, a second positioning hole 41 and an axis hole 44 that penetrate it. The first positioning hole 43 and the second positioning hole 41 can be selectively inserted by the locking rod 23. The axis hole 44 is penetrated by the main shaft 28, and the step platform 2 is rotatably connected to the upper end of the main ladder rod 11. The first positioning hole 43, the second positioning hole 41, and the axis hole 44 are located on the front side of the reinforcing plate body 4b on the main plate body 4a. The upper end of the main plate body 4a is a hole plate portion 442, and the lower end is a main plate connecting portion 441. The first positioning hole 43, the second positioning hole 41, and the axis hole 44 are all located in the hole plate portion 442. The main plate connecting portion 441 is a rectangular plate structure, which is inserted into the upper end of the main ladder rod 11 and connected by bolts. A stopper 45 is also provided at the front end of the main board body 4a. The stopper 45 is formed by bending a part of the board body on the main board body 4a. The stopper 45 is mounted on the left and right support plates 25 of the pedal platform 2 to prevent the pedal platform 2 from over-turning when switching positions. In addition, due to the existence of the stopper 45, the multifunctional connecting plate 4 and the pedal platform 2 form a mutual limit. When the user uses the handrail, the pedal platform 2 can also provide support for the entire multifunctional connecting plate 4, avoiding the deformation and failure of the multifunctional connecting plate 4 to cause safety hazards to the user, and further ensuring the safety of the user. In order to further strengthen the strength of the connection structure between the multifunctional connecting plate 4 and the main ladder rod 11, a secondary connecting plate 4c is also fixedly connected to the inner side of the insertion connection end 46 of the multifunctional connecting plate 4.

[0052] The thickness of the reinforcing plate body 4b is greater than that of the main plate body 4a. The reinforcing plate body 4b is connected to the main plate body 4a to strengthen the structural strength of the entire multifunctional connecting plate 4. A limiting body 42 is provided at the upper end 452 of the reinforcing plate body 4b. A retaining groove 421 with an opening toward the rear side is provided on the limiting body 42. When the handrail rod 3 is in the upright position, it is accommodated in the retaining groove 421 to limit the handrail rod 3 to prevent the handrail rod 3 from rotating forward, thereby providing a stable and reliable handrail structure for the user. The lower end of the reinforcing plate body 4b is a sub-plate connecting portion 451. The sub-plate connecting portion 451 and the main plate connecting portion 441 are stacked to form a structurally reinforced insertion connecting end 46, which is inserted into the upper end of the main ladder rod 11 and fixedly connected by bolts.

[0053] The locking assembly is provided with a third elastic member 29 between the first locking member and the second locking member. The third elastic member 29 applies elastic force to the first locking member and the second locking member to make them move laterally outward, so that the locking position is the initial position of the locking assembly, and the locking assembly is located in the locking position when the force-applying part loses the external force. The third elastic member 29 includes a locking spring located between the two locking rods 23. The locking spring is located between the two locking rods 23 in a compressed state, thereby pushing the two locking rods 23 laterally outward. The locking spring is a cylindrical spring, and its two ends are respectively sleeved on the inner ends of the two locking rods 23.

[0054] To install the locking assembly, the rear end 21 of the pedal platform 2 has a transverse groove 211. The locking assembly is installed in the transverse groove 211. The transverse groove 211 is located at the rear side of the main rotating shaft 28. The driving shaft is a short shaft, and the two main rotating shafts 28 are respectively located on the left and right sides (lateral sides) of the pedal platform 2 and connected to the left and right multifunctional connecting plates 4. The force-applying part is a platform dial button fixedly connected to the inner end of the locking rod 23. The two platform dial knobs 20 (the first platform dial knob 20 and the second platform dial knob 20) are arranged opposite to each other. The platform dial knob is fixedly connected to the locking rod 23 by a screw 24. The platform dial knob is an L-shaped mechanism, which includes a dial knob base 201 and a toggle handle 202 located on the dial knob base 201. By holding the two toggle handles 202 and moving them toward each other, the locked position can be switched to the unlocked position. The distance between the two toggle handles 202 is within 15 cm, which is convenient for users to operate with one hand. A limit stopper is also provided in the transverse groove 211. The two limit levers include an inner limit lever 26 and an outer limit lever 27, which are respectively located on the lateral sides of the first platform dial knob 20 or the second platform dial knob 20, and the platform dial knob is limited to reciprocate between the two limit levers (the inner limit lever 26 and the outer limit lever 27), and then the dead point positions touching the two limit levers correspond to the locking position (outer limit lever 27) and the unlocking position (inner limit lever 26). The two inner limit levers 26 are arranged adjacent to each other.

[0055] like Figure 1 , Figure 2 As shown, a retractable handrail 3 is also connected to the upper end of the ladder body 1. The handrail 3 has an erected position and a retracted position. The handrail 3 is rotatably connected to the main ladder rod 11, and switches between the erected position and the retracted position by rotation. A limiting body 42 is also fixedly provided on the multifunctional connecting plate 4. A retaining groove 421 is provided on the limiting body 42, and the retaining groove 421 opens toward the rear side. The handrail 3 rotates on the rear side of the step platform 2. The handrail 3 rotates upward until it is embedded in the retaining groove of the limiting body 42 and is limited, and is in the erected position at this time. The handrail 3 is in the retracted position when it rotates downward and is parallel to the main ladder rod 11.

[0056] The adjustable folding boarding ladder is also provided with an insertion pin 8. The handrail rod 3 is rotatably connected to the main ladder rod 11 through the handrail rotating shaft 35. The ladder body 1 is provided with a first plug hole above the handrail rotating shaft 35 and a second plug hole below the handrail rotating shaft 35. The first plug hole and the second plug hole are equidistant from the handrail rotating shaft 35. The insertion pin 8 is connected to the handrail rod 3, and a fourth elastic member is provided on the handrail rod 3 to elastically bias the insertion pin 8 outward to facilitate the insertion pin 8 to be pulled out. A threaded sleeve with a threaded hole is also fixed on the multifunctional connecting plate 4. The inner end of the insertion pin 8 is a threaded end, which passes through the plug hole (the first plug hole or the second plug hole) on the handrail rod 3 and is threadedly connected to the threaded hole of the multifunctional connecting plate 4. A pin ring is provided at the outer end of the insertion pin 8. The first plug hole is located on the multifunctional connecting plate 4, and the second plug hole is located on the main ladder rod 11. When in the erected position, the insertion pin 8 is inserted into the first plug hole to position the handrail rod 3. When in the stowed position, the insertion pin 8 is inserted into the second insertion hole to position the handrail rod 3 .

[0057] It should be understood that the above description is for illustration and not for limitation. By reading the above description, many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by these claims. For the purpose of comprehensiveness, all articles and references, including the disclosures of patent applications and announcements, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to abandon the subject matter, nor should it be considered that the inventor has not considered the subject matter as part of the disclosed utility model subject matter.

Claims

1. A multifunctional connecting plate, characterized in that: include: Main plate body and reinforcing plate body; The main board body has an outer board surface and an inner board surface facing each other; the reinforcing board body is installed on the outer board surface of the main board body; The main board body is provided with a first positioning hole, a second positioning hole and an axial hole for the main shaft to pass through; the first positioning hole and the second positioning hole can be selectively inserted by a locking rod; the first positioning hole and the second positioning hole and the axial hole are located on the front side of the reinforcing plate body on the main board body; the upper end of the main board body is the orifice plate part, and the lower end is the main board connecting part; the first positioning hole and the second positioning hole and the axial hole are all located in the orifice plate part.

2. The multifunctional connecting plate according to claim 1, characterized in that: The front end of the main board body is also provided with a stopper formed by bending.

3. The multifunctional connecting plate according to claim 1, characterized in that: The thickness of the reinforcing plate body is greater than the thickness of the main plate body.

4. The multifunctional connecting plate according to claim 1, characterized in that: The upper end of the reinforcing plate body is provided with a limiting body; the limiting body is provided with a retaining groove opening toward the rear side; the lower end of the reinforcing plate body is a sub-plate connecting part; the sub-plate connecting part and the main plate connecting part are stacked to form an insertion connecting end.

5. A vehicle-mounted ladder, characterized in that: include: A ladder body having a plurality of parallel steps; Rotating a step platform connected to the upper end of the ladder body; The pedal platform has a folded position and an unfolded position; A handrail connecting the two sides of the ladder body; the handrail has an erected position and a retracted position; the handrail is rotatably connected to the main ladder rod and switches between the erected position and the retracted position by rotating; A locking assembly operable to move laterally and having an unlocked position and a locked position; Wherein, when the locking assembly is in the locked position, the pedal platform can be positioned in the folded position or the unfolded position; when the locking assembly is in the unlocked position, the pedal platform is allowed to switch between the folded position and the unfolded position; the upper end of the main ladder rod is fixedly connected to a multifunctional connecting plate as described in any one of claims 1 to 4, having a first positioning hole corresponding to the unfolded position and a second positioning hole corresponding to the folded position; wherein, the second positioning hole is higher than the first positioning hole.

6. The vehicle-mounted ladder according to claim 5, characterized in that: The locking assembly comprises a first locking member and a second locking member that move in a transverse direction; the first locking member and the second locking member both comprise a locking rod that moves in a transverse direction; one end of the locking rod is an insertion end, and the other end is provided with a force-applying portion, and the force-applying portion receives force to push the locking rod to move in a transverse direction; the outer ends of the two locking rods are respectively inserted into the first positioning holes or the second positioning holes of the multifunctional connecting plates on both sides when in the locking position, thereby positioning the pedal platform in the unfolded position or the folded position; The locking assembly is provided with a third elastic member between the first locking member and the second locking member; the third elastic member applies an elastic force to the first locking member and the second locking member to make them move laterally outward toward a locking position.

7. The vehicle-mounted ladder according to claim 6, characterized in that: The rear end of the pedal platform has a transverse groove; the locking assembly is installed in the transverse groove; the force-applying part includes a platform dial button fixedly connected to the inner end of the locking rod; the platform dial button is fixedly connected to the locking rod by a screw; the platform dial button generates opposite movement by force to switch from a locked position to an unlocked position.

8. The vehicle-mounted ladder according to claim 7, characterized in that: A limit stopper is also provided in the transverse groove; the two limit stoppers are respectively located on the lateral sides of the platform dial button, limiting the platform dial button to move back and forth only between the two limit stoppers, and then the dead point positions touching the two limit stoppers correspond to the locked position and the unlocked position respectively.

9. The vehicle-mounted ladder according to claim 8, characterized in that: The handrail rod can be rotated upward until it is embedded in the retaining groove of the limiting body and is limited to be located in the upright position; when the handrail rod is rotated downward and is parallel to the main ladder rod, it is located in the retracted position.

10. The vehicle-mounted ladder according to claim 9, characterized in that: The boarding ladder is also provided with an insertion pin; the handrail rod is rotatably connected to the main ladder rod through a handrail rotating shaft; the ladder body is provided with a first plug hole above the handrail rotating shaft and a second plug hole below the handrail rotating shaft; the first plug hole and the second plug hole are at an equal distance from the handrail rotating shaft; when in the upright position, the insertion pin is inserted into the first plug hole to position the handrail rod; when in the folded position, the insertion pin is inserted into the second plug hole to position the handrail rod.

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