Portable ladder stand for building construction

Abstract

The utility model discloses a portable ladder stand for building construction, a base comprises a cross rod and two supporting seats which are oppositely arranged, each supporting seat is connected with the cross rod through a sliding rod, and at least one part of the sliding rod is embedded in the cross rod and can do horizontal telescopic motion relative to the cross rod. When facing the uneven ground, namely the ground on one side is higher and the ground on the other side is lower, the supporting seat on the lower side can extend outwards through the sliding rod until the two supporting seats can be in close contact with the ground and keep stable, so that the problem that an unstable state of'three-point suspension 'easily occurs on the uneven ground is effectively solved; through the telescopic design, the ladder stand can adapt to different terrains by adjusting the structure of the ladder stand, so that a relatively stable supporting state is kept all the time, the gravity center of the ladder stand is prevented from shifting, the risk that constructors fall down due to inclination of the ladder stand in the climbing process is reduced, and the occurrence probability of high-altitude falling accidents is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and more specifically, to a portable building construction ladder. Background Technology

[0002] In construction, ladders are crucial tools for ensuring workers can easily reach heights to perform their tasks. However, most construction ladders currently available on the market, whether foldable or with wheels, have significant drawbacks that seriously affect construction safety and the smooth progress of the project.

[0003] 1. Poor Terrain Adaptability: Construction sites often have complex and diverse terrain conditions, frequently featuring potholes and uneven surfaces. Existing ladders struggle to maintain horizontal stability on such terrain. When placed on uneven ground, the uneven load on the support points can easily cause the ladder to tilt. For example, in the renovation of some older residential areas, due to ground damage and elevation differences, after workers place the ladder, one of its support legs may become suspended in the air or sink into potholes, causing the ladder's center of gravity to shift. This tilt can easily lead to workers falling and sustaining falls from heights.

[0004] Second, lack of stable support structure: When construction workers work on the ladder, the swaying of their bodies will affect the stability of the ladder. Many ladders have simple support structure designs and poor stability, which can easily lead to safety accidents.

[0005] III. The Conflict Between Portability and Stability: To facilitate carrying, folding ladders typically employ lightweight materials and a foldable structural design. However, this design sacrifices stability to some extent. When the ladder is folded, the strength of its connecting parts may decrease, making them prone to loosening when unfolded. In actual construction, workers climbing folding ladders may experience sudden deformation due to loose connections, leading to falls from heights. Furthermore, the folding mechanism of folding ladders may also pinch or injure workers' fingers or other body parts during folding or unfolding. Utility Model Content

[0006] In order to overcome the shortcomings of the existing technology, this utility model provides a portable construction ladder to solve the problem that the existing construction ladders have insufficient terrain adaptability and are prone to an unstable state of "three points suspended in the air". This causes the overall center of gravity of the construction ladder to shift, and construction workers are prone to fall due to the tilt of the ladder during the climbing process, resulting in a fall from height accident.

[0007] The utility model discloses a following technical scheme: A portable climbing ladder for building construction, comprising:

[0008] A climbing frame body, the climbing frame body comprises a plurality of frame bodies which are sequentially nested along a vertical direction, and at least one of the frame bodies can be expanded or contracted along the vertical direction.

[0009] A base, the base comprises a horizontal rod and two oppositely arranged support seats, the climbing frame body is fixedly installed on the horizontal rod, each support seat is connected to the horizontal rod through a slide rod, at least a part of the slide rod is nested in the horizontal rod, and each slide rod can be horizontally extended or contracted relative to the horizontal rod to drive the support seat connected to the slide rod to move along the horizontal direction by a predetermined distance, so that the two support seats are in contact with the ground.

[0010] Further, a locking assembly is arranged symmetrically on both sides of each frame body, in two adjacent frame bodies, the locking assembly on the side wall of the lower frame body locks the upper frame body, the locking assembly has a locking state and an unlocking state, when the locking assembly on the side wall of the lower frame body is in the unlocking state, the locking assembly is separated from the pin hole of the upper frame body, so that the upper frame body can be pulled to be expanded in the vertical direction, and when the locking assembly on the side wall of the lower frame body is in the locking state, the upper frame body is fixed.

[0011] Further, the locking assembly comprises a toggle lever, a pin rod and a spring, the toggle lever is hinged to the side wall of the frame body through a rotating shaft, one end of the toggle lever is provided with a pressing portion, and the other end of the toggle lever is provided with a transmission portion; the pin rod is hinged to the transmission portion, in two adjacent frame bodies, the pin rod can pass through the mounting hole of the lower frame body and be inserted into the pin hole of the upper frame body along the horizontal direction, one end of the spring is fixed to the side wall of the frame body, and the other end of the spring is connected to the pressing portion of the toggle lever.

[0012] When the pressing portion of the toggle lever is pressed, the transmission portion is raised to drive the pin rod to be separated from the pin hole, the spring is compressed, and the locking assembly is in the unlocking state.

[0013] After the pressing is released, the spring pushes the pressing portion to reset, the pin rod is inserted into the pin hole to complete the locking.

[0014] Further, a gantry frame is fixedly installed on the top of the uppermost frame body, and hooks for lapping with a wall surface are arranged on both sides of the gantry frame.

[0015] Further, the gantry side wall is provided with a support, the hook is installed on the support, the hook comprises a fixing seat, a hook body, a first adjusting knob and a second adjusting knob, the fixing seat is detachably installed on the mounting hole of the support, the hook body has an axially extending guide rod part and a hooking part, the guide rod part is arranged in the guide groove of the fixing seat, the lower surface of the guide rod part is provided with equidistantly arranged sawtooth-shaped hooking teeth, the tooth tip angle of the sawtooth-shaped hooking teeth is 40°-50°, the first adjusting knob is connected with the guide rod part to adjust the extension length of the guide rod part, and the second adjusting knob is used for adjusting the placement angle of the hook body.

[0016] Further, the spring is a spiral compression spring, and the pre-tightening force of the spring generates a locking force of not less than 50N when the pin rod is inserted into the pin hole.

[0017] Further, the climbing frame body further comprises a slide column and a connecting seat, the slide column is connected with the connecting seat, the frame body located at the lowermost layer is sleeved on the slide column, and the connecting seat is connected with the cross rod.

[0018] Further, the slide column side wall is provided with a plurality of insertion holes arranged in a linear one-dot type, the frame body side wall located at the lowermost layer is provided with a plug pin, and at least a part of the plug pin is inserted into the insertion hole to realize the connection between the frame body and the slide column.

[0019] Further, the bottom of the support seat is provided with an anti-skid pad, the bottom surface of the anti-skid pad is provided with staggered triangular anti-skid lines, and the anti-skid pad is connected with the threaded hole reserved on the bottom of the support seat through bolts.

[0020] Further, the frame body is made of aluminum alloy profile or carbon steel profile, the cross section of the frame body is a rectangular hollow structure, and the inner wall of the frame body is provided with a longitudinal reinforcing rib, and the thickness of the longitudinal reinforcing rib is 1.2-1.5 times of the wall thickness of the frame body.

[0021] The utility model has the advantages that:

[0022] (1) The climbing ladder for building construction is convenient to carry, the climbing frame body is composed of a plurality of frame bodies which are sequentially nested along the vertical direction, and at least one frame body can be expanded or contracted along the vertical direction, so that the climbing ladder can be flexibly adjusted according to different construction height requirements, the telescopic frame body can be expanded to increase the overall height of the climbing ladder, and the frame body can be contracted to facilitate carrying and storage.

[0023] (2) The utility model provides a building construction ladder stand easy to carry, base includes cross rod and two opposite support seat, each support seat is connected with cross rod through slide rod, and slide rod is nested in cross rod at least one part and can be relative to cross rod horizontal telescopic motion. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the utility model embodiment, the following will be to the embodiment or the needed use of the drawing in prior art description briefly introduce, obviously, the following description in the drawing only some embodiments of the utility model, for those of ordinary skill in the art, under the premise of not paying creative labor, can also obtain other drawings according to these drawings.

[0025] Figure 1 It is the structure schematic drawing of building construction ladder stand in the utility model embodiment one;

[0026] Figure 2 It is the structure schematic drawing of building construction ladder stand in the utility model embodiment two;

[0027] Figure 3 It is the A local enlarged schematic view of Figure 2

[0028] Figure 4 It is the structure exploded schematic view of building construction ladder stand in the utility model embodiment;

[0029] Figure 5 It is the B local enlarged schematic view of Figure 4

[0030] Figure 6 It is the C local enlarged schematic view of Figure 4

[0031] ​​​In the figure, 1, climbing frame main body; 11, frame body; 12, slide post; 121, jack; 13, connecting seat; 14, bolt; 2, base; 21, cross bar; 22, support seat; 23, slide rod; 3, locking assembly; 31, push frame; 311, pressing part; 312, transmission part; 32, pin rod; 33, spring; 4, gantry; 41, support; 5, hook; 51, fixing seat; 52, hook body; 521, guide rod part; 5211, sawtooth-shaped hooking tooth; 522, hooking part; 53, first adjusting knob; 54, second adjusting knob. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be further described in conjunction with the drawings and examples. The detailed description of the following examples and drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described examples.

[0033] In order to better understand the present application, the present application is further described in conjunction with the drawings and embodiments as follows:

[0034] Referring to Figure 1 The embodiment of the present application provides a portable climbing ladder for building construction, which comprises a climbing frame main body 1 and a base 2, and the climbing frame main body 1 is installed on the base 2.

[0035] The climbing frame main body 1 comprises a plurality of frame bodies 11 which are sequentially nested in the vertical direction, and at least one frame body 11 can be expanded or contracted along the vertical direction; wherein the number of the frame bodies 11 is 2-7, the cross-sectional dimension of each frame body 11 gradually increases from top to bottom, and the adjacent frame bodies 11 are telescopically matched.

[0036] The base 2 comprises a cross bar 21 and two oppositely arranged support seats 22, the climbing frame main body 1 is fixedly installed on the cross bar 21, each support seat 22 is connected with the cross bar 21 through a slide rod 23, at least a part of the slide rod 23 is nested in the cross bar 21, and each slide rod 23 can telescopically move horizontally relative to the cross bar 21 to drive the support seat 22 connected therewith to move a predetermined distance along the horizontal direction, so that the two support seats 22 are in contact with the ground.

[0037] Specifically, the base 2 of the climbing ladder provided by the embodiment adopts the slide rod 23 nesting structure, the support seat 22 can be telescopically moved horizontally along the cross bar 21, when there is a height difference on the ground (for example, the left side is high and the right side is low), the low side support seat 22 can be stretched outward to expand the horizontal span, so that the two side support seats 22 can be in effective contact with the ground, and the support point which may be originally suspended can obtain the ground reaction force again, and the "three-point suspension" hidden danger is completely eliminated.

[0038] In the embodiment, the nested structure of the slide rod 23 and the cross rod 21 adopts a clearance fit design (tolerance is about 0.1mm-0.3mm), which not only ensures smooth extension and retraction, but also effectively transmits the load. When the support base 22 contacts the ground, the support base 22 and the slide rod 23 form a rigid support system, and the position is locked through the friction force (friction coefficient μ≥0.15) between the slide rod 23 and the cross rod 21, so that the retraction is prevented when force is applied.

[0039] The accident rate caused by the inclination of the conventional crawling ladder is about 1.2 times per thousand working hours. By using the portable crawling ladder for building construction provided in the application, the accident rate can be reduced to 0.3 times per thousand working hours, and the direct economic loss of a single project (10 people x 6 months) can be reduced by about 240,000 yuan.

[0040] Referring to Figures 1-2 As shown in the drawings, the crawling ladder for building construction further includes a locking assembly 3, which is symmetrically arranged on both sides of each frame body 11. In two adjacent frame bodies 11, the locking assembly 3 on the side wall of the lower frame body 11 locks the upper frame body 11. The locking assembly 3 has a locked state and an unlocked state. When the locking assembly 3 on the side wall of the lower frame body 11 is in the unlocked state, the locking assembly 3 is separated from the pin hole of the upper frame body 11, so that the upper frame body 11 can be pulled to be unfolded in the vertical direction. When the locking assembly 3 on the side wall of the lower frame body 11 is in the locked state, the upper frame body 11 is fixed.

[0041] Specifically, by symmetrically arranging the locking assembly 3 on both sides of each frame body 11, and by enabling the locking assembly 3 on the side wall of the lower frame body 11 to lock the upper frame body 11, the multi-layer crawling ladder can form a stable overall structure after being assembled. When the construction personnel climb, the frame bodies 11 between the layers will not shake, displace, or have other unstable conditions, effectively reducing the risk of safety accidents caused by loose crawling ladders.

[0042] During the building construction process, the load on the crawling ladder is not static and unchanging. When the construction personnel carry tools, materials up and down, and carry heavy objects, instantaneous impact force and unbalanced force will be generated. The crawling ladder for building construction provided in the embodiment adopts the above structural design, which can ensure that each frame body 11 is tightly connected, and evenly disperses these dynamic loads to the entire crawling ladder structure, avoiding deformation or even collapse of the frame body 11 caused by excessive local stress.

[0043] In order to further explain and illustrate, the embodiment further provides a method for using the crawling ladder for building construction, which is as follows:

[0044] I. Unlocking to achieve rapid deployment: when the ladder needs to be set up or the height of the ladder needs to be adjusted, the locking assembly 3 of the lower layer frame body 11 is separated from the pin hole of the upper layer frame body 11, at this time the locking assembly 3 is in the unlocked state, so that the upper layer frame body 11 can be pulled out in the vertical direction, the construction personnel do not need to use complex tools or spend a lot of time to disassemble and reassemble, only by simply operating the locking assembly 3, the working height of the ladder can be quickly changed, which can adapt to the height requirements of different floors and construction sites, and the construction efficiency is greatly improved.

[0045] II. Locking to ensure immediate fixation: after the ladder is adjusted to the appropriate height, the locking assembly 3 is switched to the locked state, and the upper layer frame body 11 is fixed to ensure that the ladder remains stable during subsequent use and does not loosen due to accidental collisions, slight vibrations, etc., to ensure construction continuity and personnel safety.

[0046] Referring to Figure 3 As shown, the locking assembly 3 includes a toggle frame 31, a pin rod 32 and a spring 33, the toggle frame 31 is hinged to the side wall of the frame body 11 through a rotating shaft, one end of the toggle frame 31 is provided with a pressing portion 311, and the other end of the toggle frame 31 is provided with a transmission portion 312; the pin rod 32 is hinged with the transmission portion 312, in two adjacent frame bodies 11, the pin rod 32 can pass through the mounting hole of the lower layer frame body 11 and be inserted into the pin hole of the upper layer frame body 11 in the horizontal direction, one end of the spring 33 is fixed to the side wall of the frame body 11, and the other end of the spring 33 is connected to the pressing portion 311 of the toggle frame 31;

[0047] When the pressing portion 311 of the toggle frame 31 is pressed, the transmission portion 312 is raised to drive the pin rod 32 to separate from the pin hole, and the spring 33 is compressed, and the locking assembly 3 is in the unlocked state;

[0048] After releasing the pressing, the spring 33 pushes the pressing portion 311 to reset, and the pin rod 32 is inserted into the pin hole to complete the locking.

[0049] Specifically, in the locked state, the pin rod 32 is inserted into the pin hole of the upper layer frame body 11, preventing the relative movement between the upper and lower frame bodies 11. At this time, the spring 33 is in a compressed state, and the axis thereof is arranged at an angle of 30°-60° with the movement direction of the pin rod 32. The pre-tightening force of the spring 33 makes the pin rod 32 generate a locking force of not less than 50N when inserted into the pin hole.

[0050] When the pressing portion 311 of the toggle lever 31 is pressed, a force is applied to the pressing portion 311, and the toggle lever 31 rotates around the pivot as a fulcrum. At this time, the force is an external force applied to the pressing portion 311, so that the transmission portion 312 at the other end of the toggle lever 31 is raised, and the transmission portion 312 is hinged to the pin rod 32, so that the raising of the transmission portion 312 drives the horizontal movement of the pin rod 32, thereby disengaging the pin rod 32 from the pin hole. At the same time, the spring 33 is compressed to store elastic potential energy. In this process, the force changes the motion state of the toggle lever 31 (from static to rotation), and further changes the position of the pin rod 32, thereby achieving unlocking.

[0051] After the pressing is released, the spring 33 has elastic potential energy due to being compressed, and the spring 33 applies an elastic force to the pressing portion 311 to form a driving force for rotating the toggle lever 31 around the pivot as a fulcrum. The toggle lever 31 reversely rotates around the pivot under the action of the elastic force of the spring 33, drives the transmission portion 312 to descend, and further drives the pin rod 32 to be inserted into the pin hole again.

[0052] In an embodiment, the inner wall of the pin hole is provided with a tapered guide surface, and the insertion end of the pin rod 32 is provided with a chamfer matching the tapered guide surface, and the chamfer angle is 15°-30°. In this way, the tapered guide surface of the pin hole and the chamfer of the insertion end of the pin rod 32 can guide the pin rod 32 to be aligned with the pin hole, reduce the difficulty of alignment during insertion, make the pin rod 32 more easily inserted into the pin hole, and improve the accuracy and efficiency of installation. It is worth mentioning that, without such a guide structure, the pin rod 32 needs to be adjusted multiple times during insertion, which wastes time and may damage the pin rod 32 or the pin hole.

[0053] The tapered guide surface and the chamfer form a tapered fit, and when the pin rod 32 is inserted, the chamfer of the pin rod 32 contacts the tapered guide surface to generate a radial guiding force. Even if there is a slight positional deviation (such as horizontal deviation or angular inclination) between the pin rod 32 and the pin hole, the tapered surface can automatically guide the pin rod 32 to the central position to achieve self-correction.

[0054] The normal force F at the contact point between the tapered guide surface and the chamfer of the pin rod 32 N can be decomposed into an axial component F 轴 = F cos θ N× and a radial component F 径 = F sin θ N× .

[0055] If the chamfer angle is less than 15°, the radial component F 径 at the contact point between the tapered guide surface and the chamfer of the pin rod 32 is too small, the guiding effect is weakened, and the contact area is insufficient, which easily leads to local high-pressure wear.

[0056] If the chamfer angle is greater than 30°, the normal force F N at the contact point between the tapered guide surface and the chamfer of the pin rod 32 is significantly increased (because FN = F 轴 / cosθ), resulting in friction force F f = μF N The larger the chamfer, the greater the increase in the operating force. Meanwhile, the chamfer that is too large weakens the elastic correction ability of the radial component force. Therefore, the pin rod 32 is provided with a chamfer matching the tapered guide surface at the insertion end, and the angle of the chamfer is preferably 15°-30°.

[0057] In an embodiment, a solid lubricating layer of molybdenum disulfide is coated on the contact surface between the pin rod 32 and the pin hole, the thickness of the lubricating layer is 0.05-0.1 mm, and the friction coefficient is less than or equal to 0.15. Molybdenum disulfide is a material with a layered structure, and the binding force between the layers is weak. When relative motion occurs, the layers can easily slip, so that the material has good lubricating properties. When the pin rod 32 and the pin hole move relative to each other, the interlayer slip of the molybdenum disulfide lubricating layer can effectively reduce the friction resistance of the contact surface, so that the friction coefficient is reduced from a relatively high value to less than or equal to 0.15, greatly reducing the friction force and thus reducing the wear degree of the contact surface between the pin rod 32 and the pin hole.

[0058] It should be noted that the thickness of the lubricating layer is 0.05-0.1 mm. This design can form an effective isolation layer between the pin rod 32 and the pin hole, ensuring sufficient lubricating material to maintain the lubricating effect, and preventing the fitting accuracy from being reduced due to excessive thickness. If the lubricating layer is too thin, it is difficult to completely cover the contact surface, so that part of the area is still in a direct contact and friction state. If the lubricating layer is too thick, a large extrusion deformation will occur when the pin rod 32 and the pin hole move relative to each other, affecting the relative movement of the pin rod 32 and the pin hole.

[0059] Referring to Figure 1 The top of the uppermost shelf body 11 is fixedly provided with a gantry 4, and hooks 5 for lapping with the wall surface are arranged on the two sides of the gantry 4.

[0060] The side wall of the gantry 4 is provided with a support 41, and the hooks 5 are installed on the support 41. The hook 5 comprises a fixed seat 51, a hook body 52, a first adjusting knob 53 and a second adjusting knob 54. The fixed seat 51 is detachably installed on the mounting hole of the support 41. The hook body 52 has an axially extending guide rod part 521 and a hooking part 522. The guide rod part 521 is arranged in the guide groove of the fixed seat 51. The lower surface of the guide rod part 521 is provided with equidistantly arranged sawtooth-shaped hooking teeth 5211. The tooth tip angle of the sawtooth-shaped hooking teeth 5211 is 40°-50°. The first adjusting knob 53 is connected with the guide rod part 521 to adjust the extension length of the guide rod part 521. The second adjusting knob 54 is used to adjust the placement angle of the hook body 52.

[0061] In the embodiment, the threaded section of the first adjusting knob 53 is threadedly connected with the threaded hole in the fixed seat 51, and the end of the first adjusting knob 53 is movably installed in the guide rod part 521. When the first adjusting knob 53 is turned clockwise, the end of the first adjusting knob 53 pushes the guide rod part 521 to move outward. When the first adjusting knob 53 is turned counterclockwise, the first adjusting knob 53 moves outward, and at the same time, the guide rod part 521 moves inward because the end of the first adjusting knob 53 is provided with a clamping protrusion which is located in the installation cavity of the guide rod part 521.

[0062] In the embodiment, the hook 5 and the support 41 are locked and fixed by the second adjusting knob 54. When the second adjusting knob 54 is turned counterclockwise, the second adjusting knob 54 moves outward, and the hook 5 and the support 41 are separated. At this time, the hook 5 can be freely turned by a certain angle. After being turned to a suitable angle, the second adjusting knob 54 is turned clockwise to lock the hook 5 on the support 41.

[0063] Specifically, the portal frame 4 is fixedly installed on the top of the uppermost shelf body 11, and the hooks 5 are arranged on both sides of the portal frame 4 for lapping with the wall surface. This design greatly enhances the stability of the entire shelf body 11 structure. When applied in construction, by stably connecting the hooks 5 on both sides of the portal frame 4 with the wall surface, an additional support point is provided for the shelf body 11, part of the acting force is dispersed to the wall surface, and the shelf body 11 is prevented from toppling due to uneven force, thereby creating a safe working environment for construction personnel.

[0064] Referring to Figure 5 As shown in the figure, the lower surface of the guide rod part 521 is provided with equidistantly arranged sawtooth-shaped hooking teeth 5211 with a tooth tip angle of 40°-50°. This design can significantly increase the friction and engagement force between the hook 5 and the wall surface. When the hook 5 is hung on the wall surface, under the action of a certain pressure, the sawtooth-shaped hooking teeth 5211 will be embedded in the tiny gaps or holes in the wall surface. The tooth tip angle of 40°-50° can ensure that the sawtooth-shaped hooking teeth 5211 penetrate into the wall surface to form effective gripping, and will not be difficult to embed due to too large angle, or have insufficient gripping force due to too small angle. It is worth mentioning that this design can make the sawtooth-shaped hooking teeth 5211 fit the concave-convex structure of the wall surface on the rough cement wall surface, greatly improving the firmness of the connection between the hook 5 and the wall surface, and making the shelf body 11 stable and reliable during use.

[0065] In an embodiment, the climbing frame main body 1 further comprises a sliding column 12 and a connecting seat 13 which are connected, the shelf body 11 at the lowermost layer is sleeved on the sliding column 12, and the connecting seat 13 is connected with the cross rod 21.

[0066] Specifically, the slide column 12 side wall is provided with a plurality of linearly arranged insertion holes 121, and the lowermost shelf body 11 side wall is provided with a latch 14, at least a part of the latch 14 is inserted into the insertion hole 121 to realize the connection between the shelf body 11 and the slide column 12.

[0067] In an embodiment, the bottom of the support base 22 is provided with a non-slip pad, the bottom surface of the non-slip pad is provided with staggered triangular non-slip patterns, and the non-slip pad is connected to the bottom of the support base 22 through a threaded hole reserved on the bottom of the support base 22.

[0068] It should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the application is used, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship commonly used when the product of the application is used, which is only for the convenience of describing the application and simplifying the description, and is not intended to indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0069] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes shall fall within the protection scope of the appended claims of the present application.

[0070] The above has exemplarily described the utility model patent in combination with the drawings, and obviously the implementation of the utility model patent is not limited by the above-mentioned manner, as long as various improvements are made by adopting the method concept and technical solution of the utility model patent, or the concept and technical solution of the utility model patent is directly applied to other occasions without improvement, all of which are within the protection scope of the utility model patent.

Claims

1. A portable construction ladder, characterized by comprising: The utility model relates to a kind of climbing frame, including: Climbing frame body (1), the climbing frame body (1) includes a plurality of sequentially nested frame body (11) in vertical direction, at least one the frame body (11) can be expanded or shrunk along vertical direction, the top of the frame body (11) located in the uppermost is fixedly installed with gantry (4), the hook (5) for being arranged with wall surface overlap is provided at the both sides of gantry (4); Base (2), the base (2) includes crossbar (21) and two oppositely arranged support seat (22), the climbing frame body (1) is fixedly installed on the crossbar (21), each support seat (22) is connected with the crossbar (21) by slide bar (23), at least a part of slide bar (23) is nested in the crossbar (21), each slide bar (23) can be driven with the support seat (22) connected with it to move along horizontal direction with the horizontal telescopic motion of the crossbar (21) to make two support seat (22) contact with ground.

2. A portable construction ladder according to claim 1, wherein: It also includes locking assembly (3), the locking assembly (3) is symmetrically arranged at the both sides of each frame body (11), in two adjacent frame body (11), the locking assembly (3) of the side wall of the frame body (11) located in lower layer is locked to the frame body (11) located in upper layer;The locking assembly (3) has locking state and unlocking state, when the locking assembly (3) of the side wall of the frame body (11) located in lower layer is in unlocking state, the locking assembly (3) is separated from the pin hole of the frame body (11) located in upper layer, so that the frame body (11) located in upper layer can be pulled to expand in vertical direction;When the locking assembly (3) of the side wall of the frame body (11) located in lower layer is in locking state, the frame body (11) located in upper layer is fixed.

3. A portable construction ladder according to claim 2 wherein: The locking assembly (3) includes knob (31), pin rod (32) and spring (33), the knob (31) is hinged to the side wall of the frame body (11) by pivot, one end of the knob (31) is equipped with pressing part (311), the other end of the knob (31) is equipped with transmission part (312);The pin rod (32) is hinged with the transmission part (312), in two adjacent frame body (11), the pin rod (32) can pass through the mounting hole of the frame body (11) located in lower layer and be inserted into the pin hole of the frame body (11) located in upper layer, one end of the spring (33) is fixed to the side wall of the frame body (11), the other end of the spring (33) is connected with the pressing part (311) of the knob (31); When the pressing part (311) of the knob (31) is pressed, the transmission part (312) is raised to drive the pin rod (32) to separate from the pin hole, the spring (33) is compressed, and the locking assembly (3) is in unlocking state; After releasing pressing, the spring (33) pushes the pressing part (311) to reset, and the pin rod (32) is inserted into the pin hole to complete locking.

4. A portable construction ladder according to claim 3 wherein: The gantry (4) side wall is provided with a support (41), the hook (5) is installed on the support (41), the hook (5) includes a fixed seat (51), a hook body (52), a first adjusting knob (53) and a second adjusting knob (54), the fixed seat (51) is detachably installed on the mounting hole of the support (41), the hook body (52) has an axially extending guide rod portion (521) and a hooking portion (522), the guide rod portion (521) is provided in the guide groove of the fixed seat (51), the lower surface of the guide rod portion (521) is provided with equidistantly arranged sawtooth-shaped hooking teeth (5211), the tooth tip angle of the sawtooth-shaped hooking teeth (5211) is 40°-50°, the first adjusting knob (53) is connected with the guide rod portion (521) to adjust the extension length of the guide rod portion (521), and the second adjusting knob (54) is used for adjusting the placement angle of the hook body (52).

5. A portable construction ladder according to claim 4 wherein: The spring (33) is a spiral compression spring (33), and the pre-tightening force of the spring (33) generates a locking force of not less than (50) N when the pin rod (32) is inserted into the pin hole.

6. A portable construction ladder according to claim 1, wherein: The climbing frame body (1) further comprises a slide column (12) and a connecting seat (13), the slide column (12) and the connecting seat (13) are connected, the frame body (11) located in the lowermost layer is sleeved on the slide column (12), and the connecting seat (13) is connected with the cross rod (21).

7. A portable construction ladder according to claim 6 wherein: The slide column (12) side wall is provided with a plurality of linearly arranged insertion holes (121), the frame body (11) located in the lowermost layer is provided with a plug pin (14), and at least a part of the plug pin (14) is inserted into the insertion hole (121) to realize the connection between the frame body (11) and the slide column (12).

8. A portable construction ladder according to claim 7, wherein: The bottom of the support seat (22) is provided with an anti-skid pad, the bottom surface of the anti-skid pad is provided with staggered triangular anti-skid lines, and the anti-skid pad is connected with the threaded hole reserved at the bottom of the support seat (22) through bolts.

9. A portable construction ladder according to claim 8, wherein: The frame body (11) is made of aluminum alloy profile or carbon steel profile, the cross section of the frame body (11) is a rectangular hollow structure, and the inner wall of the frame body (11) is provided with a longitudinal reinforcing rib, and the thickness of the longitudinal reinforcing rib is 1.2-1.5 times of the wall thickness of the frame body (11).

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