Ladder with handrails that retract easily

Abstract

The utility model belongs to ladder technical field especially relates to a ladder convenient to handrail contraction. A kind of ladder convenient to handrail contraction, comprising: mutually hinged on top to constitute herringbone folding structure's front pipe and rear pipe;Handrail frame is sleeved on the front pipe, and the vertical rod of the handrail frame is inserted into front pipe and is slidably matched with front pipe;With the vertical rod cooperation's elastic locking piece, the elastic locking piece can be elastically stretched along the radial direction of vertical rod, to realize the fixing or unlocking between front pipe and vertical rod;Unlocking piece is arranged on the front pipe or rear pipe;When front pipe and rear pipe are folded, the unlocking piece acts on the elastic locking piece, forces the elastic locking piece to cancel the locking state between front pipe and vertical rod, realizes the automatic contraction of handrail frame. The utility model has the advantages that handrail can be contracted conveniently.

Description

Technical Field

[0001] This utility model belongs to the field of ladder technology, and in particular relates to a ladder with retractable handrails. Background Technology

[0002] Chinese patent application number 201820415073.0 discloses a ladder handrail structure. In this patent, the handrail bar is inserted into the ladder bar, and the two are unlocked by a manually operated latch. Each time the handrail needs to be retracted, the user must actively pull the latch, causing inconvenience. Utility Model Content

[0003] To address the shortcomings of existing technologies, a ladder with retractable handrails is provided.

[0004] This utility model is achieved using the following technical solution: a ladder with retractable handrails, comprising:

[0005] The front and rear tubes are hinged together at the top to form a herringbone folded structure.

[0006] A handrail frame is fitted onto the front tube, and the vertical rod of the handrail frame is inserted into the front tube and slides in cooperation with the front tube;

[0007] An elastic locking element that cooperates with the vertical rod can elastically extend and retract along the radial direction of the vertical rod, thereby achieving the fixing or unlocking of the front tube and the vertical rod;

[0008] An unlocking device provided on the front or rear tube;

[0009] When the front tube and the rear tube are folded, the unlocking component acts on the elastic locking component, forcing the elastic locking component to release the locking state between the front tube and the vertical rod, thereby realizing the automatic retraction of the handrail frame.

[0010] When using the ladder, after unfolding it, pull the handrail upwards so that the elastic locking element passes through both the front tube and the vertical bar, thus securing the handrail to the front tube. When the ladder is not in use, simply fold it up. After the front and rear tubes are closed, the unlocking mechanism acts on the elastic locking element, forcing it to unlock and releasing the lock between the front tube and the handrail, allowing the handrail to retract automatically.

[0011] This solution involves setting an unlocking mechanism on the front or rear tube, which automatically unlocks the elastic locking mechanism when the front or rear tube is folded. Compared to the comparison file, this solution eliminates the need for the user to actively pull or press the elastic locking mechanism, making it very convenient.

[0012] Preferably, the front tube and the rear tube are arranged to overlap in the front-rear direction, the elastic locking member includes a locking protrusion and an elastic element, both the front tube and the vertical rod are provided with locking holes for the locking protrusion to pass through, and the unlocking member is provided on the front tube, which includes:

[0013] The fixing part is fixed to the outer wall of the front tube, and the fixing part is provided with a sliding groove that opens towards the rear tube side;

[0014] The movable part is slidably fitted in the groove and is arranged around the circumferential outer side of the front tube;

[0015] In its natural state, the elastic element applies elastic force to both the locking protrusion and the movable part, causing the locking protrusion to pass through the locking holes of the front tube and the vertical rod, and causing the movable part to move towards the rear tube side; when the front tube and the rear tube are folded together, the rear tube squeezes the movable part, forcing the locking protrusion to exit the locking holes of the front tube and / or the vertical rod, thereby releasing the locking state of the handrail frame and the front tube.

[0016] The movable part is arranged around the circumferential outer side of the front tube. The movable part has a slot through which the front tube passes. The diameter of the slot is larger than the diameter of the front tube, so that the movable part has space to move within the groove.

[0017] Preferably, the elastic locking member is disposed inside the vertical rod, and the elastic member directly applies an elastic force to the locking protrusion, so that the locking protrusion passes through the locking hole of the front tube and the vertical rod and abuts against the movable part, causing the movable part to move towards the rear tube side; the rear inner wall of the movable part is provided with an unlocking protrusion that abuts against the locking protrusion.

[0018] When the front tube and the rear tube are folded together, the rear tube presses against the movable part, causing the unlocking protrusion to extend into the lock hole, forcing the locking protrusion to at least exit the lock hole of the front tube.

[0019] Preferably, the locking protrusion is fixed on the inner wall of the front side of the movable part, and the elastic element is disposed between the inner wall of the front tube and the inner wall of the rear side of the movable part. The two ends of the elastic element abut against the outer wall of the front tube and the inner wall of the rear side of the movable part, respectively, thereby directly applying an elastic force to the movable part to make the movable part move towards the rear tube side, so that the locking protrusion is inserted into the locking hole of the front tube and the vertical rod from front to back.

[0020] When the front tube and the rear tube are folded together, the rear tube presses against the movable part, causing the locking protrusion to at least exit the locking hole of the vertical rod.

[0021] Preferably, the front tube and the rear tube are arranged to overlap in the front-rear direction, the elastic locking member is provided on the vertical rod, the front tube and the vertical rod have locking holes through which the elastic locking member passes, and the unlocking member is an unlocking protrusion provided on the outer wall surface of the rear tube facing the front tube. The unlocking protrusion is located on the rotation path of the locking hole. When the front tube and the rear tube are folded, the unlocking protrusion can enter the locking hole to force the elastic locking member to at least exit the locking hole of the front tube, so as to release the locking state of the handrail and the front tube.

[0022] Preferably, the front tube and the rear tube are staggered in the front-rear direction, the elastic locking member is disposed on the vertical rod, and the front tube and the vertical rod have locking holes through which the elastic locking member passes; the rear tube is provided with an extension that coincides with the front tube in the front-rear direction, and the extension is provided with the unlocking member, which is an unlocking protrusion; when the front tube and the rear tube are folded, the unlocking protrusion can enter the locking hole to force the elastic locking member to at least exit the locking hole of the front tube, so as to release the locking state of the handrail and the front tube.

[0023] When the front tube is located inside the rear tube, the extension is also located on the inner wall of the rear tube; when the front tube is located outside the rear tube, the extension is located on the outer wall of the rear tube.

[0024] Preferably, the front tube is provided with a foot pedal, and the rear tube is provided with a support plate that supports the foot pedal when the ladder is unfolded. The support plate constitutes the extension, and the unlocking member is disposed on the support plate.

[0025] The above settings allow for a more compact structure and reduced production costs.

[0026] Preferably, the handrail is a single-tube handrail or a double-tube handrail.

[0027] Compared with the prior art, the beneficial effects of this utility model are: by setting an unlocking component on the front tube or the rear tube, the unlocking component will automatically unlock the elastic locking component when the front tube and the rear tube are folded. Compared with the prior art, the user does not need to actively pull or press the elastic locking component, which is very convenient. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the ladder when it is unfolded.

[0029] Figure 2 This is a structural diagram of the handrail frame;

[0030] Figure 3 This is a structural schematic diagram of the ladder in Example 1 when it is unfolded, from another perspective.

[0031] Figure 4This is a schematic diagram of the ladder in Example 1 when it is folded and closed.

[0032] Figure 5 This is a cross-sectional view of the ladder in Example 1 when it is folded and closed.

[0033] Figure 6 This is a schematic diagram of the structure of Example 3;

[0034] Figure 7 for Figure 6 A sectional view;

[0035] Figure 8 This is a structural diagram of the unlocking component;

[0036] Figure 9 for Figure 8 A schematic diagram of the structure of the moving part and the fixing part of the unlocking component;

[0037] Figure 10 This is a cross-sectional view of Example 4.

[0038] Reference numerals: 1. Front tube; 11. Foot pedal; 12. Locking hole; 2. Rear tube; 3. Handrail frame; 31. Vertical bar; 4. Connecting rod; 5. Support plate; 6. Unlocking component; 61. Unlocking protrusion; 62. Fixed part; 621. Slide groove; 63. Movable part; 7. Elastic locking component; 71. Locking protrusion; 72. Elastic component. Detailed Implementation

[0039] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0040] Example 1

[0041] like Figure 1 As shown, this embodiment 1 discloses a front tube 1 and a rear tube 2 that are hinged together at the top to form a herringbone folding structure. The front tube 1 is provided with several foldable foot pedals 11. The foot pedals 11 are folded using existing connection methods, and all foot pedals 11 are connected by connecting rods 4. A parallelogram structure is used to achieve simultaneous folding and opening of all connecting rods 4. The rear tube 2 is provided with a support plate 5 corresponding to the topmost foot pedal 11. The support plate 5 is fixed to the rear tube 2. When the foot pedals 11 are unfolded, the topmost foot pedal 11 is supported on the support plate 5, and the connection of the connecting rods 4 maintains the flattened state of all foot pedals 11.

[0042] like Figures 1 to 5As shown, the front tube 1 and the rear tube 2 are staggered in the front-rear direction, and the two front tubes 1 are rotatably connected to the inner sides of the two rear tubes 2. When the front tubes 1 and the rear tubes 2 are folded, the front tubes 1 and the rear tubes 2 have overlapping parts in the left-right direction. The top of the front tube 1 is equipped with a handrail 3. In this embodiment 1, the handrail 3 is a double-tube handrail, that is, it includes two vertical rods 31. The two vertical rods 31 are respectively inserted into the inside of the front tube 1 and are in contact with and slidingly engaged with the inner wall of the front tube 1.

[0043] The vertical rod 31 is provided with an elastic locking member 7, which has a cylindrical locking protrusion 71 and an elastic element. The locking protrusion 71 and the elastic element can be integrally formed, for example, using a leaf spring plus a protrusion. Alternatively, they can be separate structures, using a spring and the locking protrusion 71, with an outward force applied to the locking protrusion 71. Both the vertical rod 31 and the front tube 1 are provided with locking holes 12 for the locking protrusion 71 of the elastic locking member 7 to extend out. The elastic locking member 7 is located inside the vertical rod 31. The head of the locking protrusion 71 of the elastic locking member 7 is spherical, thus facilitating its passage through the locking holes 12 of the vertical rod 31 and the front tube 1.

[0044] An unlocking element 6 is provided on the support plate 5, and the unlocking element 6 is set on the rotation trajectory of the lock hole 12. The unlocking element 6 has an unlocking protrusion 61, which is also cylindrical. When the folding operation between the front tube 1 and the rear tube 2 is performed, the unlocking protrusion 61 of the unlocking element 6 will be inserted into the lock hole 12 and squeeze the elastic locking element 7, forcing the elastic locking element 7 to retract inward and exit the lock hole 12 of the front tube 1, thereby releasing the locking state between the front tube 1 and the handrail 3, realizing the automatic retraction of the handrail.

[0045] Example 2

[0046] The difference between Embodiment 2 and Embodiment 1 is that in Embodiment 2, the front tube 1 and the rear tube 2 are arranged to overlap in the front-rear direction, and the unlocking component 6 is an unlocking protrusion 61, which is located on the outer wall surface of the rear tube 2 facing the front tube 1. (Not shown in the figure)

[0047] Example 3

[0048] like Figures 6 to 9 As shown, the difference between Embodiment 3 and Embodiment 1 is that the front tube 1 and the rear tube 2 in Embodiment 3 are arranged to overlap in the front-rear direction. The unlocking component 6 is disposed on the outer wall of the front tube 1. The unlocking component 6 includes a fixed part 62 and a movable part 63. The fixed part 62 is fixedly attached to the outer wall of the front tube 1 and has a groove 621 that opens towards the rear tube 2. The movable part 63 is slidably fitted into the groove 621. It is arranged around the outside of the front tube 1 and has a slot through which the front tube 1 passes. The diameter of the slot is larger than the diameter of the front tube, so that the movable part 63 can move in the front-rear direction within the groove 621.

[0049] The elastic locking member 7 is provided on the outside of the front tube 1. Both the front tube 1 and the vertical rod 31 are provided with locking holes 12 that open to the front side. The elastic locking member 7 includes a locking protrusion 71 fixed on the inner wall of the front side of the movable part 63, and an elastic member 72 provided between the outer wall of the rear side of the front tube 1 and the inner wall of the rear side of the movable part 63. The two ends of the elastic member 72 abut against the inner wall of the rear side of the movable part 63 and the outer wall of the rear side of the front tube 1, respectively.

[0050] In its natural state, the elastic element 72 causes the movable part 63 to move towards the rear tube 2, so that the locking protrusion 71 is inserted into the locking holes 12 of the front tube 1 and the vertical rod 31 from front to back, thereby achieving locking; when the front tube 1 and the rear tube 2 are folded together, the rear tube 2 presses the movable part 63, causing the movable part 63 to move forward, so that the locking protrusion 71 is at least withdrawn from the locking hole 12 of the vertical rod 31, thereby releasing the locking state of the handrail frame 3 and the front tube 1.

[0051] Example 4

[0052] like Figure 10 As shown, the difference between Embodiment 4 and Embodiment 3 is that the elastic locking member 7 in Embodiment 4 is disposed inside the vertical rod 31. The elastic locking member 7 can be a combination of a leaf spring and a locking protrusion 71, or it can be a combination of an existing spring and a locking protrusion 71. The unlocking member 6 in Embodiment 4 is structurally similar to the unlocking member in Embodiment 3. The difference is that the locking holes of the front tube 1 and the vertical rod 31 in Embodiment 4 both open towards the rear. After the locking protrusion 71 extends out of the locking hole 12 of the front tube 1, it directly presses against the rear inner wall of the movable part 63, causing the movable part 63 to move towards the rear tube 2. The rear inner wall of the movable part 63 is provided with an unlocking protrusion 61 that abuts against the locking protrusion 71. When the front tube 1 and the rear tube 2 are folded together, the rear tube 2 presses the movable part 63, causing the movable part 63 to press the elastic locking member 7 inward, so that the unlocking protrusion 61 enters the locking hole 12 of the front tube 1, forcing the elastic locking member 7 to exit the locking hole of the front tube 1, thereby releasing the locking state of the handrail frame 3 and the front tube 1.

[0053] The handrail 3 mentioned above can also be a single-tube handrail, that is, with only one vertical bar 31.

Claims

1. A ladder with retractable handrails, characterized in that, include: The front and rear tubes are hinged together at the top to form a herringbone folded structure. A handrail frame is fitted onto the front tube, and the vertical rod of the handrail frame is inserted into the front tube and slides in cooperation with the front tube; An elastic locking element that cooperates with the vertical rod can elastically extend and retract along the radial direction of the vertical rod, thereby achieving the fixing or unlocking of the front tube and the vertical rod; An unlocking device provided on the front or rear tube; When the front tube and the rear tube are folded, the unlocking component acts on the elastic locking component, forcing the elastic locking component to release the locking state between the front tube and the vertical bar, thereby realizing the automatic retraction of the handrail frame; The front tube and rear tube are arranged to overlap in the front-rear direction. The elastic locking member includes a locking protrusion and an elastic element. Both the front tube and the vertical rod are provided with locking holes through which the locking protrusion passes. The unlocking member is provided on the front tube and includes: a fixing part, which is fixed to the outer wall of the front tube, and the fixing part is provided with a groove opening towards the rear tube; a movable part, which is slidably fitted in the groove and surrounds the circumferential outer side of the front tube; in the natural state, the elastic element applies an elastic force to both the locking protrusion and the movable part, causing the locking protrusion to pass through the locking holes of the front tube and the vertical rod, and causing the movable part to move towards the rear tube; when the front tube and the rear tube are folded together, the rear tube squeezes the movable part, forcing the locking protrusion to exit the locking hole of the front tube and / or the vertical rod, thereby releasing the locking state of the handrail and the front tube; or The front tube and the rear tube are offset in the front-rear direction. The elastic locking member is provided on the vertical rod. The front tube and the vertical rod have locking holes through which the elastic locking member passes. The rear tube is provided with an extension that coincides with the front tube in the front-rear direction. The extension is provided with the unlocking member, which is an unlocking protrusion. When the front tube and the rear tube are folded, the unlocking protrusion can enter the locking hole to force the elastic locking member to at least exit the locking hole of the front tube, thereby releasing the locking state of the handrail and the front tube.

2. The ladder with retractable handrail as described in claim 1, characterized in that: The front tube and the rear tube are arranged to overlap in the front-rear direction. The elastic locking member is located inside the vertical rod. The elastic member directly applies an elastic force to the locking protrusion, so that the locking protrusion passes through the locking hole of the front tube and the vertical rod and abuts against the movable part, causing the movable part to move towards the rear tube side. The inner rear wall of the movable part is provided with an unlocking protrusion that abuts against the locking protrusion. When the front tube and the rear tube are folded together, the rear tube presses against the movable part, causing the unlocking protrusion to extend into the lock hole, forcing the locking protrusion to at least exit the lock hole of the front tube.

3. The ladder with retractable handrail as described in claim 1, characterized in that: The front tube and the rear tube are arranged to overlap in the front-rear direction. The locking protrusion is fixed on the inner wall of the front side of the movable part. The elastic element is arranged between the inner wall of the front tube and the inner wall of the rear side of the movable part. The two ends of the elastic element abut against the outer wall of the front tube and the inner wall of the rear side of the movable part, respectively, thereby directly applying an elastic force to the movable part to make the movable part move towards the rear tube side, so that the locking protrusion is inserted into the locking hole of the front tube and the vertical rod from front to back. When the front tube and the rear tube are folded together, the rear tube presses against the movable part, causing the locking protrusion to at least exit the locking hole of the vertical rod.

4. The ladder with retractable handrail according to claim 1, characterized in that: The front tube and the rear tube are staggered in the front-rear direction. The front tube is provided with a foot pedal, and the rear tube is provided with a support plate that supports the foot pedal when the ladder is unfolded. The support plate constitutes the extension, and the unlocking member is provided on the support plate.

5. The ladder with retractable handrail according to any one of claims 1 to 4, characterized in that: The handrail frame is a single-tube handrail frame or a double-tube handrail frame.

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