Ladder with lifting handrail
By designing the structure of the lifting handrail on the folding aluminum ladder and using the articulated sleeve and telescopic handrail frame to adjust the handrail height, the problems of insufficient handrail height and limited storage space in the prior art are solved, and the safety and functionality of the ladder are improved.
Patent Information
- Application Number
- CN202420466228.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-11
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-03-11
AI Technical Summary
The handrail height of the existing folding aluminum ladder is limited, which cannot effectively support the user's safety at the highest level. At the same time, the fixed structure limits the storage space of the ladder, affecting use.
A ladder with lifting handrail is designed, the front and rear leg tubes are connected through a hinge sleeve, and the telescopic handrail frame is set up. The telescopic adjustment of the handrail is achieved by using the C-shaped side rod and the give way groove of the hinge sleeve, and the stability of the handrail is ensured through a locking device.
The height adjustment of the handrail is achieved, which meets different usage needs and improves user safety. At the same time, due to the flexibility of structural design, the space utilization of the ladders during storage is more efficient.
Smart Images
Figure CN222668090U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a folding aluminum ladder, in particular to a ladder with a lifting handrail. Background Art
[0002] Folding aluminum ladders are lightweight and easy to store. They are a common household tool and are sold in large supermarkets. Folding aluminum ladders can be roughly divided into two categories, depending on whether they have handrails or not. One is a V-shaped ladder without handrails, and the other is a herringbone ladder with handrails. The handrails can provide protection and help users stand more steadily on the top step.
[0003] However, most of the existing handrails are directly fixed to the leg tubes of the ladder, or are an integral structure.
[0004] It is either a welded structure or a bolt-locked structure, that is, the handrail is a fixed structure, taking into account the issue of convenient storage. Therefore, the height of the handrail is generally low. When a person is at the highest step of the ladder, the handrail is not very practical due to the height limitation. In addition, the fixation of the handrail limits the storage space, which affects the normal use of the ladder. Utility Model Content
[0005] The utility model provides a ladder with a lifting handrail, which overcomes the shortcomings of the background technology.
[0006] In order to solve the above technical problems, the utility model provides a ladder with a lifting handrail, comprising a ladder body and a handrail frame telescopically sleeved on the ladder, the ladder comprising two front leg tubes and two rear leg tubes, the front leg tubes and the rear leg tubes are hinged to form an openable herringbone structure; the handrail frame comprises a crossbar and two side bars symmetrically arranged on the left and right, the upper ends of the side bars are connected to the ends of the crossbar;
[0007] The ladder comprises two hinge sleeves, the two hinge sleeves are respectively covered on the tops of the two front leg tubes, and the tops of the two rear leg tubes are respectively rotatably hinged with the two hinge sleeves; the cross section of the side rod is C-shaped, and the C-shaped opening is arranged on the inner side; the side rod is covered on the outer side of the front leg tube with the C-shaped opening;
[0008] The hinge sleeve is provided with a clearance groove, and the side rods slide in the clearance groove. A locking device is provided at the lower end of at least one of the side rods, which serves as a telescopic adjustment switch for controlling the armrest frame.
[0009] In a preferred embodiment, a step surface is provided on the upper end surface of the hinge sleeve, and a clearance groove is provided on the outer side surface of the hinge sleeve;
[0010] When the handrail frame is retracted, the cross bar abuts against the step surface.
[0011] In a preferred embodiment, the hinge sleeve includes a first sleeve and a second sleeve, the first sleeve is sleeved on the front leg tube, the second sleeve is sleeved on the rear leg tube, and the second sleeve includes a space for the rear leg tube to rotate.
[0012] In a preferred embodiment, the rear leg tube is rotatably hinged in the second sleeve by rivets.
[0013] In a preferred embodiment, the locking device comprises a hand grip sleeve sleeved on the lower end of the side rod, a button is pivotally connected to the hand grip sleeve, at least one locking hole is provided on the side of the front leg tube, and a ball head is provided on the button corresponding to the locking hole;
[0014] The ball head can be inserted into or removed from the lock hole under the driving of the button.
[0015] In a preferred embodiment, the hand grip sleeve is clamped with the side rod, the middle part of the button is rotatably pivoted on the hand grip sleeve, and the button is arranged on the rear side of the hand grip sleeve; the ball head is arranged on the inner side of the lower end of the button, and an elastic member is arranged on the inner side of the upper end of the button, and the ball head can be inserted into the lock hole under the push of the elastic member.
[0016] In a preferred embodiment, the portion of the button where the ball head is disposed extends out of the grip sleeve and forms a limiting fit with a lock hole disposed on the front leg tube.
[0017] In a preferred embodiment, the lock hole is configured as a rectangular hole, and the cross-section of the ball head is a convex surface; the ball head includes a convex portion and two clamping edges, the clamping edges are clamped in the button, and the convex portion is placed outside the button and inserted into and cooperated with the rectangular hole.
[0018] In a preferred embodiment, the side surface of the front leg tube includes a plurality of locking holes; the plurality of locking holes are spaced apart along the length direction of the leg tube.
[0019] In a preferred embodiment, the armrest frame is U-shaped, and locking devices are provided at the lower ends of the two side rods.
[0020] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:
[0021] 1. The front and rear leg tubes are connected by setting a hinge sleeve. The connecting end sections of the front and rear leg tubes of this structure are in the same plane, making the overall ladder look simple, reliable and beautiful in appearance.
[0022] 2. By setting a retractable handrail on the ladder, the ladder can have the function of a handrail and can be folded and stored. The retractable handrail can also meet the needs of handrail use at different heights and is more functional.
[0023] 3. Through the rectangular hole setting of the lock hole, combined with the insertion of the ball head with a convex cross-section, compared with the structure of the conventional circular lock hole, the rectangular hole can better lock the ball head to form a more stable locking structure, which can avoid the phenomenon of the locking device being disengaged and improve the safety performance of the ladder. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a schematic diagram of the use status of the ladder in the preferred embodiment of the utility model;
[0025] Figure 2 It is a cross-sectional view of the hinge sleeve of the ladder in the preferred embodiment of the utility model;
[0026] Figure 3 for Figure 1 Enlarged view of part A;
[0027] Figure 4 for Figure 2 Enlarged view of part B;
[0028] Figure 5 This is a cross-sectional view of a locking device according to a preferred embodiment of the utility model;
[0029] Figure 6 This is a schematic diagram of the insertion and matching of the lock hole and the ball head in the preferred embodiment of the utility model;
[0030] Figure 7 It is a structural schematic diagram of the lock hole in the preferred embodiment of the utility model.
[0031] Explanation of the reference numerals: 1. ladder; 11. front leg tube; 111. lock hole; 12. rear leg tube; 13. hinge sleeve; 131. clearance groove; 132. first sleeve; 133. second sleeve; 134. rivet; 135. step surface; 2. handrail frame; 21. cross bar; 22. side bar; 3. locking device; 31. hand grip; 32. button; 33. ball head; 34. elastic member. DETAILED DESCRIPTION
[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.
[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted 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 the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.
[0035] refer to Figure 1-Figure 7 The present embodiment provides a ladder 1 with a lifting handrail, comprising a ladder body and a handrail frame telescopically sleeved on the ladder, the ladder 1 comprising two front leg tubes 11, two rear leg tubes 12 and two hinge sleeves 13, the front leg tubes 11 and the rear leg tubes 12 are hinged to form an openable herringbone structure, the two hinge sleeves 13 are respectively covered on the top of the two front leg tubes 11, and the top of the two rear leg tubes 12 are respectively rotatably hinged to the two hinge sleeves 13. Specifically, the upper end surface of the hinge sleeve 13 is a plane, the hinge sleeve 13 comprises a first sleeve 132 and a second sleeve 133, the first sleeve 132 is sleeved on the front leg tube 11, the second sleeve 133 is sleeved on the rear leg tube 12, the rear leg tube 12 is rotatably hinged in the second sleeve 133 through a rivet 134, and the second sleeve 133 comprises a space for the rear leg tube 12 to rotate. The front leg tube 11 and the rear leg tube 12 are opened and closed by using an articulated sleeve, so that the connection between the front leg tube 11 and the rear leg tube 12 is more stable and the opening and closing is more convenient. At the same time, the upper end surface planar structure of the articulated sleeve is convenient for hand-held support of the ladder, and is beautiful and neat.
[0036] The handrail frame 2 is U-shaped, and includes a cross bar 21 and two side bars 22 symmetrically arranged on the left and right. The upper ends of the side bars 22 are connected to the ends of the cross bar 21; the cross section of the side bars 22 is a C-shaped cross section, and the C-shaped opening is arranged on the inner side; the inner side refers to the opposite surface of the two side bars 22, that is, facing the inner direction of the ladder 1. The side bars 22 are covered on the outer side of the front leg tube 11 with a C-shaped opening; the outer side of the hinge sleeve 13 is provided with a clearance groove 131, and the side bars 22 slide in the clearance groove 131. The C-shaped structure can make way better and avoid interference between the handrail frame 2 and the hinge sleeve 13 during the lifting process. The C-shaped structure is covered on the outer side of the front leg tube 11, which can be more stable during sliding and convenient for disassembly and assembly. The ladder 1 looks simple and reliable as a whole.
[0037] In order to make the ladder 1 and the handrail frame 2 more beautiful as a whole after being folded, a step surface 135 is set on the upper end surface of the hinge sleeve 13, and the upper end protrusion of the second sleeve 133 on which the rear leg tube 12 is installed is higher than the step surface 135. When the handrail frame 2 is retracted, the cross bar 21 is against the step surface 135, and the upper end surface of the cross bar 21 is exactly flush with the upper end surface of the second sleeve 133, forming a plane structure, so that the ladder 1 is more flat and simple as a whole after being folded.
[0038] In order to effectively perform telescopic locking of the handrail frame 2, locking devices 3 are provided at the lower ends of the two side rods 22 to serve as telescopic adjustment switches for controlling the handrail frame 2; locking devices 3 are provided on both sides to make the telescopic and locking more stable and firm.
[0039] The locking device 3 includes a hand-grip sleeve 31 sleeved on the lower end of the side rod 22, and a button 32 is rotatably pivoted on the hand-grip sleeve 31. At least one locking hole 111 is arranged on the side of the front leg tube 11, and the button 32 is provided with a ball head 33 corresponding to the locking hole 111; the ball head 33 can be inserted into or removed from the locking hole 111 under the drive of the button 32.
[0040] The middle part of the button 32 is pivotally connected to the hand grip 31 , the ball head 33 is arranged on the inner side of the lower end of the button 32 , and an elastic member 34 is arranged on the inner side of the upper end of the button 32 . The ball head 33 can be inserted into the lock hole 111 under the push of the elastic member 34 .
[0041] When in use, the ball head 33 is inserted into the locking hole 111 of the front leg tube 11 under the push of the elastic member 34, thereby restricting the side rod 22 of the handrail frame 2 and the front leg tube 11 of the ladder 1, so as to achieve the purpose of fixing the handrail frame 2. When the height of the handrail frame 2 needs to be adjusted, the button 32 is pressed, and the upper end of the button 32 presses the elastic member 34 so that the lower end of the button 32 rotates and tilts up, so that the ball head 33 can be disengaged from the locking hole 111, thereby releasing the restriction of the handrail frame 2, and the handrail frame 2 can be raised and lowered.
[0042] In order to allow the handrail frame 2 to have different height adjustments, the side of the front leg tube 11 includes a plurality of lock holes 111; the plurality of lock holes 111 are spaced apart along the length direction of the leg tube. The provision of the plurality of lock holes 111 enables the handrail frame 2 to have different height adjustment functions. The handrail frame 2 can be quickly lowered when stored, and the height of the handrail frame 2 can be adjusted according to the user's requirements when in use, thereby improving the safety of the ladder 1. The hand grip 31 is snap-fitted with the side rod 22, and the button 32 is disposed at the rear side of the side rod 22. In this way, while holding the hand grip 31 and pressing the button 32, the handrail frame 2 can be better grasped for lifting and lowering adjustment.
[0043] In order to simplify the locking structure of the ball head 33 and the lock hole 111, the part of the button 32 where the ball head 33 is set extends out of the hand grip 31, and forms a limited fit with the lock hole 111 set on the front leg tube 11. The part of the button 32 where the ball head 33 is set directly fits with the lock hole 111 on the front leg tube 11, and the pressing operation of the button 32 can be more flexible and more convenient. In addition, when designing the structure, it is only necessary to set the lock hole 111 of the front leg tube 11, and there is no need to open a clearance hole on the hand grip 31 and the side rod 22. The structural fit is more concise, and the corresponding insertion fit of the lock hole 111 and the ball head 33 is simpler, and there is no need for multi-hole alignment, which can avoid the phenomenon that the ball head 33 falls out and cannot be locked due to multi-hole errors.
[0044] In order to facilitate the pressing operation of the button 32, the elastic member 34 is configured as a spring. A positioning pin is provided at the position of the button 32 corresponding to the elastic member 34, and a mounting hole is provided at the position of the hand grip 31 corresponding to the elastic member 34. One end of the elastic member 34 is fixed in the mounting hole, and the other end is plugged into the positioning pin. Both ends of the elastic member 34 are limited, and the structure is more stable.
[0045] In order to make the locking of the locking device 3 safer, the locking hole 111 is set as a rectangular hole, and the cross section of the ball head 33 is a convex surface; the ball head 33 includes a convex part and two clamping edges, the clamping edges are clamped in the button 32, and the convex part is placed outside the button 32 and inserted into the rectangular hole. Through the rectangular hole setting of the locking hole 111, the ball head 33 with a convex cross section can be inserted into the rectangular hole. Compared with the structure of a conventional circular locking hole, the rectangular hole can better lock the ball head 33, forming a more stable locking structure, which can avoid the phenomenon of the locking device 3 being disengaged, and improve the safety performance of the ladder 1.
[0046] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.
Claims
1. A ladder with a lifting handrail, comprising a ladder body and a handrail frame telescopically sleeved on the ladder; the ladder comprises two front leg tubes and two rear leg tubes, the front leg tubes and the rear leg tubes are hinged to form an openable herringbone structure; the handrail frame comprises a crossbar and two side bars symmetrically arranged on the left and right, the upper ends of the side bars are connected to the ends of the crossbar; Features: The ladder comprises two hinge sleeves, the two hinge sleeves are respectively covered on the tops of the two front leg tubes, and the tops of the two rear leg tubes are respectively rotatably hinged with the two hinge sleeves; the cross section of the side rod is C-shaped, and the C-shaped opening is arranged on the inner side; the side rod is covered on the outer side of the front leg tube with the C-shaped opening; The hinge sleeve is provided with a clearance groove, and the side rods slide in the clearance groove. A locking device is provided at the lower end of at least one of the side rods, which serves as a telescopic adjustment switch for controlling the armrest frame.
2. A ladder with lifting handrails according to claim 1, characterized in that: The upper end surface of the hinge sleeve is provided with a step surface, and the outer side surface of the hinge sleeve is provided with a clearance groove; When the handrail frame is retracted, the cross bar abuts against the step surface.
3. A ladder with lifting handrails according to claim 2, characterized in that: The hinge sleeve includes a first sleeve and a second sleeve, the first sleeve is sleeved on the front leg tube, the second sleeve is sleeved on the rear leg tube, and the second sleeve includes a space for the rear leg tube to rotate.
4. A ladder with lifting handrails according to claim 3, characterized in that: The rear leg tube is rotatably hinged in the second sleeve through rivets.
5. The ladder with lifting handrail according to claim 1, characterized in that: The locking device comprises a hand grip sleeve sleeved on the lower end of the side rod, a button is pivotally connected to the hand grip sleeve, at least one locking hole is arranged on the side of the front leg tube, and a ball head is arranged on the button corresponding to the locking hole; The ball head can be inserted into or removed from the lock hole under the driving of the button.
6. A ladder with lifting handrails according to claim 5, characterized in that: The hand grip sleeve is clamped with the side rod, the middle part of the button is rotatably pivoted on the hand grip sleeve, and the button is arranged on the rear side of the hand grip sleeve; the ball head is arranged on the inner side of the lower end of the button, and an elastic member is arranged on the inner side of the upper end of the button, and the ball head can be inserted into the lock hole under the push of the elastic member.
7. A ladder with lifting handrails according to claim 6, characterized in that: The portion of the button where the ball head is arranged extends out of the hand grip sleeve and forms a limiting fit with a lock hole arranged on the front leg tube.
8. The ladder with lifting handrail according to claim 5, characterized in that: The lock hole is set as a rectangular hole, and the cross section of the ball head is a convex surface; the ball head includes a convex portion and two clamping edges, the clamping edges are clamped in the button, and the convex portion is placed outside the button and inserted into and matched with the rectangular hole.
9. A ladder with lifting handrails according to claim 8, characterized in that: The side surface of the front leg tube includes a plurality of locking holes; the plurality of locking holes are distributed at intervals along the length direction of the leg tube.
10. The ladder with lifting handrail according to claim 1, characterized in that: The handrail frame is U-shaped, and locking devices are arranged at the lower ends of the two side rods.