Multifunctional telescopic herringbone ladder

Abstract

The utility model relates to a multifunctional telescopic herringbone ladder which comprises a pair of hinged ladder assemblies, each ladder assembly comprises a plurality of telescopic ladder sections which are sequentially distributed from top to bottom, and each telescopic ladder section comprises a pair of telescopic sections and a pedal connected between the two telescopic sections; a first bottom support is arranged at the bottom end of the fixed ladder section of one ladder frame, the first bottom support comprises first sleeves which are respectively sleeved on the outer walls of the bottoms of the two fixed ladder sections, and the bottom surface of each first sleeve is an arc-shaped surface; a second bottom support is arranged at the bottom end of the fixed ladder section of the other ladder frame, the second bottom support comprises a supporting rod and second sleeves connected to the two sides of the supporting rod, and the bottom surface of each second sleeve is a V-shaped surface. According to the herringbone ladder disclosed by the utility model, the first bottom support and the second bottom support which are of different structures are matched to realize supporting, and the contact between surfaces can be realized under various working conditions by utilizing the matching of the first sleeve with the arc-shaped surface and the second sleeve with the V-shaped surface, so that the stable supporting of the herringbone ladder is realized, and the undesirable phenomena such as shaking are avoided.

Description

Technical Field

[0001] The utility model relates to the field of herringbone ladders, in particular to a multifunctional telescopic herringbone ladder. Background Art

[0002] Ladders are often needed for repair or maintenance tasks in homes, apartments, farms, factories and other places. Ladders must be stored somewhere when not in use. Longer ladders allow people to reach higher heights, but they are inconvenient to carry and take up more space when stored. Telescopic ladders can be extended when in use and folded when stored.

[0003] For example, patent CN205936360U mentions a joint multi-section telescopic ladder, which includes two telescopic ladders, the tops of the two telescopic ladders are hinged by two joints; the telescopic ladder includes a plurality of slidably connected ladder sections, the ladder sections include two ladder tubes arranged on the left and right sides and a cross brace connecting the two ladder tubes, the cross brace is connected to the upper end of the ladder tube, wherein the ladder tube of the upper ladder section located at the top is inserted into the ladder tube of the lower ladder section located at the bottom, and except for the topmost ladder section, the left and right ends of the cross brace of each ladder section are provided with locking devices; the locking device includes an unlocking knob arranged on the side of the cross brace, a positioning pin arranged in the cross brace and a compression spring that contacts and presses the positioning pin, the lower end of the ladder tube is provided with a positioning hole adapted to the positioning pin, and the unlocking knob is connected to the positioning pin through a slot arranged on the side of the cross brace; a joint is provided at the top of the ladder tube, and a straight tube-shaped connecting portion is provided on the joint, and the two ends of the cross brace are connected to the joint through the connecting portion, and the positioning pin and the compression spring are located in the connecting portion.

[0004] The telescopic ladder in the above patent still has certain defects when in use: the bottom surface of the base at the bottom of the solid ladder section adopts a flat structure. When this structure is in use, since the solid ladder section needs to be opened to form a herringbone shape, the base used for support is often in point-to-surface contact or line-to-surface contact with the ground. The contact area is small and instability is prone to occur, especially when used under working conditions of varying heights, it is more prone to shaking. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a multifunctional telescopic herringbone ladder with stable support.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a multifunctional telescopic herringbone ladder, the innovation of which is: comprising

[0007] A pair of hinged ladder frames, the ladder frames comprising a plurality of telescopic ladder sections sequentially distributed from top to bottom, the telescopic ladder sections comprising a pair of telescopic sections and a pedal connected between the two telescopic sections, the pedal being fixed to the telescopic section by the cooperation of a locking assembly;

[0008] In the two adjacent telescopic ladder sections, the telescopic section constituting the upper telescopic ladder section is defined as the upper telescopic section, and the telescopic section constituting the lower telescopic ladder section is defined as the lower telescopic section. The upper telescopic section is sleeved in the lower telescopic section, and the upper telescopic section moves up and down along the inner wall of the lower telescopic section.

[0009] Among the telescopic ladder sections constituting the same ladder frame, the telescopic ladder section constituting the lowermost telescopic ladder section is defined as a fixed ladder section;

[0010] A first base is provided at the bottom end of the fixed ladder section of one of the ladder frames, the first base comprises a first sleeve respectively sleeved on the outer wall of the bottom of the two fixed ladder sections, the bottom surface of the first sleeve is an arc surface, and a plurality of grooves are formed on the bottom surface of the first sleeve, so that a plurality of supporting convex ribs are formed on the bottom surface of the first sleeve;

[0011] A second base is provided at the bottom end of the fixed ladder section of the other ladder frame, and the second base includes a supporting rod and a second sleeve connected to both sides of the supporting rod. A fixing groove for accommodating the supporting rod to be embedded and fixed is also provided at the bottom ends of the two fixed ladder sections. The second sleeves are respectively located on the outsides of the two fixed ladder sections. The bottom surface of the second sleeve is a V-shaped surface, and a plurality of grooves are provided on the bottom surface of the second sleeve, so that a plurality of supporting ribs are formed on the bottom surface of the second sleeve.

[0012] Furthermore, the pedal comprises a pedal body and connecting sections connected to both sides of the pedal body, the connecting sections are ring-shaped and are directly sleeved on the outer wall of the telescopic joint;

[0013] The locking assembly is as follows: a locking cavity is opened in the pedal body, a horizontally arranged locking rod and a locking sleeve for installing the locking rod are installed in the locking cavity, a cavity for installing and moving the locking rod is opened in the locking sleeve, a reset spring is also arranged between the locking rod and the locking sleeve, one side of the locking rod extends from the locking cavity and extends into the annular inner cavity of the connecting section, and at the same time, a movable hole for the locking rod to pass through is opened on the pedal body, and a plug hole for inserting the locking rod is opened on the telescopic joint, and a dial knob connected to the locking rod is also arranged on the outer wall of the pedal body.

[0014] Furthermore, a limiting ring is provided on the outer wall of a section of the locking rod placed in the locking cavity, and the size of the outer wall of the limiting ring is larger than the size of the movable hole on the pedal body.

[0015] Furthermore, a positioning component is provided between the telescopic joint and the connecting section. The positioning component is as follows: a positioning hole is provided on the outer wall of the telescopic joint, a positioning protrusion embedded in the positioning hole is provided on the connecting section, and an installation hole for accommodating the installation of the positioning protrusion is opened on the connecting section, an elastic plate is installed in the installation hole, and the positioning protrusion is installed on the elastic plate.

[0016] Furthermore, the support rod is fixed to the fixed ladder section by the cooperation of bolts and nuts. The bottom end of the fixed ladder section is provided with several circular through holes distributed vertically for the bolts to pass through, and the support rod is provided with a waist-shaped through hole for the bolts to pass through.

[0017] Furthermore, a limiting protrusion is also provided on the outer wall of the fixed ladder section.

[0018] The advantages of the utility model are: the herringbone ladder of the utility model adopts the cooperation of the first base bracket and the second base bracket of different structures to achieve support, and utilizes the cooperation of the first sleeve of the arc surface and the second sleeve of the V-shaped surface to achieve surface-to-surface contact under various working conditions, thereby achieving stable support for the herringbone ladder and avoiding undesirable phenomena such as shaking.

[0019] The second base is designed in the form of a combination of a support rod and a second sleeve, and the second sleeve is designed to be located outside the fixed ladder section, so that the bottom end of the ladder frame on this side is wider and the support is more stable.

[0020] The design of the positioning component between the telescopic joint and the connecting section plays a role in positioning and fixing the relative position between the connecting section and the telescopic joint through the cooperation of the positioning holes on the outer wall of the telescopic joint and the positioning protrusions on the connecting section.

[0021] As for the connection between the support rod and the fixed ladder section, through the cooperation of several circular through holes distributed above and below the bottom end of the fixed ladder section and the waist-shaped through holes on the support rod, the upper and lower positions and left and right positions of the support rod relative to the fixed ladder section can be fine-tuned to a certain extent, so as to be adjusted according to the on-site working conditions.

[0022] The setting of the limiting protrusion on the outer wall of the fixed ladder section is used to play a hard limiting role on the lower limit of the pedal connected to the fixed ladder section to ensure the position of the pedal. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model is a schematic diagram of a multifunctional telescopic herringbone ladder.

[0024] Figure 2 It is a front view of the multifunctional telescopic herringbone ladder of the utility model.

[0025] Figure 3 It is a side view of the multifunctional telescopic herringbone ladder of the utility model.

[0026] Figure 4 It is a schematic diagram of the pedal in the utility model.

[0027] Figure 5 It is a bottom view of the pedal in the utility model.

[0028] Figure 6 for Figure 5 AA section view.

[0029] Figure 7 It is a schematic diagram of the first sleeve in the utility model.

[0030] Figure 8 It is a front view of the first sleeve in the utility model.

[0031] Fig. 9 It is a schematic diagram of the second base in the utility model.

[0032] Fig.10 It is a side view of the second base in the utility model.

[0033] Fig.11 It is a schematic diagram of the telescopic ladder section in the utility model. DETAILED DESCRIPTION

[0034] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0035] like Figure 1-Figure 11 A multifunctional telescopic ladder is shown, comprising

[0036] A pair of hinged ladder frames, the ladder frames include a number of telescopic ladder sections distributed in sequence from top to bottom, such as Fig.11 As shown, the telescopic ladder section includes a pair of telescopic sections 1 and a pedal 2 connected between the two telescopic sections. The pedal 2 is fixed to the telescopic section 1 through the cooperation of a locking assembly. The telescopic section 1 is in the shape of a hollow circular tube.

[0037] In the two adjacent telescopic ladder sections, the telescopic section 1 constituting the upper telescopic ladder section is defined as the upper telescopic section, and the telescopic section 1 constituting the lower telescopic ladder section is defined as the lower telescopic section. The upper telescopic section is sleeved in the lower telescopic section, and the upper telescopic section moves up and down along the inner wall of the lower telescopic section.

[0038] like Figure 4-Figure 6As can be seen from the schematic diagram shown, the pedal 2 includes a pedal body 21 and a connecting section 22 connected to both sides of the pedal body 21. The pedal body 21 is in the shape of a rectangular parallelepiped, and a plurality of semicircular or arc-shaped grooves extending along the long axis direction of the pedal body 21 are provided on the upper end surface of the pedal body 21. The connecting section 22 is in the shape of a circular ring and is connected to both sides of the long axis direction of the pedal body 21. The connecting section 22 is directly mounted on the outer wall of the telescopic joint 1, and the inner wall of the connecting section 22 is in contact with the outer wall of the telescopic joint 1.

[0039] The locking assembly is as follows: a locking cavity 23 is respectively opened on both sides of the pedal body 21, the locking cavity 23 is a rectangular cavity, and the long axis direction of the locking cavity 23 is consistent with the long axis direction of the pedal body 21, a horizontally arranged locking rod 24 and a locking sleeve 25 for installing the locking rod 24 are installed in the locking cavity 23, the locking rod 24 is a cylindrical rod, and the long axis direction of the locking rod 24 is consistent with the long axis direction of the pedal body 21, the locking sleeve 25 is directly fixed in the locking cavity 23, and a cavity for installing and moving the locking rod 24 is opened on one side of the locking sleeve 25, the locking rod 24 is horizontally inserted into the locking sleeve 25, and a return spring 26 is also arranged between the locking rod 24 and the locking sleeve 25, one side of the return spring 26 is fixed on the locking sleeve 25, and the other side of the return spring 26 is fixed on the locking rod 24, and the locking rod 24 is pushed to move horizontally in the locking cavity 23 by the telescopic force of the return spring 26.

[0040] One side of the locking rod 24 extends from the locking cavity 23 and extends into the annular inner cavity of the connecting section 22. At the same time, a movable hole for accommodating the locking rod 24 to pass through is opened on the pedal body 21, and a plug hole for accommodating the locking rod 24 to be inserted is opened on the telescopic joint 1. The pedal and the telescopic joint 1 are locked by extending the locking rod out of the pedal body 21 and inserting it into the plug hole in the telescopic joint 1. A dial knob 25 connected to the locking rod 24 is also provided on the outer wall of the pedal body 21.

[0041] A limit ring 28 is also provided on the outer wall of a section of the locking rod 24 placed in the locking cavity 23, and the size of the outer wall of the limit ring 28 is larger than the size of the movable hole on the pedal body 21. The limit ring 28 is provided to limit the relative position of the locking rod 24 in the pedal body 21, so as to prevent the locking rod 24 from being pushed too far into the telescopic joint 1 by the reset spring 26, so that the locking rod 24 cannot be reset.

[0042] A positioning component is also provided between the telescopic joint 1 and the connecting section 22. The positioning component is as follows: a positioning hole is also provided on the outer wall of the telescopic joint 1, and a positioning protrusion 27 embedded in the positioning hole is also provided on the connecting section 22. The side of the positioning protrusion 27 close to the center of the connecting section 22 is a combined surface formed by a vertical surface located on the upper side and an inclined surface located on the lower side, and the inclination direction of the inclined surface is gradually inclined from top to bottom toward a direction away from the center of the connecting section 22. A mounting hole for accommodating the installation of the positioning protrusion 27 is opened on the connecting section 22, and an elastic plate 28 is installed in the mounting hole. The positioning protrusion 27 is directly installed on the side wall of the elastic plate 28 close to the center of the connecting section 22. The elastic plate 28 is used to realize the installation of the positioning protrusion 27, and the elastic effect of the elastic plate 28 is utilized. The positioning protrusion 27 can be pulled out of the positioning hole of the telescopic joint 1 by manually turning the elastic plate 28. The design of the positioning assembly between the telescopic joint 1 and the connecting section 22 is to position and fix the relative position between the connecting section and the telescopic joint 1 through the cooperation of the positioning holes on the outer wall of the telescopic joint 1 and the positioning protrusions 27 on the connecting section 22.

[0043] Among the telescopic ladder sections constituting the same ladder frame, the telescopic ladder section constituting the lowermost telescopic ladder section is defined as the fixed ladder section 11 .

[0044] A first base is provided at the bottom end of the fixed ladder section 11 of one of the ladder frames. The first base includes a first sleeve 3 which is respectively sleeved on the outer wall of the bottom of the two fixed ladder sections 11. Figure 7 , Figure 8 As shown in the schematic diagram, the first sleeve 3 is a cylindrical sleeve with an open upper end, and the bottom surface of the first sleeve 3 is an arc-shaped surface. A plurality of grooves 31 are formed on the bottom surface of the first sleeve 3, and the grooves 31 are rectangular in shape, and the grooves 31 are distributed parallel to each other, so that a plurality of supporting ribs 32 are formed on the bottom surface of the first sleeve 3, and the supporting ribs 32 are in the shape of long strips.

[0045] A second base is provided at the bottom end of the fixed ladder section 11 of the other ladder frame. Fig. 9 , Fig.10As can be seen from the schematic diagram shown, the second base includes a supporting rod 4 and a second sleeve 41 connected to both sides of the supporting rod 4. The supporting rod 4 is a rectangular rod, and a fixing groove for accommodating the supporting rod 4 to be embedded and fixed is provided at the bottom ends of the two fixed ladder sections 11. The supporting rod 4 and the fixed ladder section 11 are fixed by the cooperation of bolts and nuts. A plurality of circular through holes 13 for accommodating bolts to pass through are provided at the bottom ends of the fixed ladder sections 11, and a waist-shaped through hole 42 for accommodating bolts to pass through is provided on the supporting rod 4, and the waist-shaped through hole 42 extends along the long axis direction of the supporting rod 4. As for the connection between the support rod 4 and the fixed ladder section 11, through the cooperation of several circular through holes 13 distributed above and below the bottom end of the fixed ladder section 11 and the waist-shaped through holes 42 on the support rod 4, the upper and lower positions and left and right positions of the support rod 4 relative to the fixed ladder section 11 can be fine-tuned to a certain extent, so as to adjust the position and height of the support rod 4 according to the requirements of the on-site working conditions so that the second base support can provide better support; and the support rod 4 and the fixed ladder section 11 are fixed by the cooperation of bolts and nuts. In subsequent use, the entire second base support can also be removed from the fixed ladder section 11, and the bottom surface of the fixed ladder section 11 can be directly used for support.

[0046] The second sleeves 41 are respectively located outside the two fixed ladder sections 11, that is, the length of the support rod 4 needs to be longer than the spacing between the two fixed ladder sections 11, and the bottom surface of the second sleeve 41 is a V-shaped surface, and a number of grooves 43 are also opened on the bottom surface of the second sleeve 41, so that a number of supporting convex ribs 44 are formed on the bottom surface of the second sleeve 41. For the design of the second bottom bracket, a combination of the support rod 4 and the second sleeve 41 is adopted, and the second sleeve 41 is located outside the fixed ladder section, so that the bottom end of the ladder frame on this side is wider and the support is more stable.

[0047] The bottom surfaces of the first sleeve 3 and the second sleeve 41 are both grooved to form convex ribs. This bottom surface has better anti-slip performance and more support advantages.

[0048] A limiting protrusion 14 is also provided on the outer wall of the fixed ladder section 11. There are several limiting protrusions 14, which are evenly distributed along the circumferential outer wall of the fixed ladder section 11, and the upper end faces of each limiting protrusion 14 have the same height. The setting of the limiting protrusion 14 on the outer wall of the fixed ladder section 11 is used to play a hard limit role on the lower limit of the pedal 2 connected to the fixed ladder section 11, so as to ensure the position of the pedal 2 and prevent the pedal 2 connected to the fixed ladder section 11 from sliding arbitrarily on the fixed ladder section 11.

[0049] In each telescopic ladder section constituting the same ladder frame, the top ends of the two telescopic ladder sections 1 located at the uppermost telescopic ladder section are further connected with a hinge joint 12, which is a hinge joint commonly used in herringbone ladders on the market.

[0050] When the stepladder of the present invention is in use, in a natural state, the return spring 26 is in a compressed state and will push the locking rod 24 to extend out of the pedal body 21 and against the outer wall of the telescopic section 1. Then, the telescopic section 1 located on the upper side is manually pulled to move upward. As the telescopic section 1 moves upward, when the locking hole on the telescopic section 1 moves to the locking rod 24, the locking rod 24 will be inserted into the locking hole under the push of the return spring 26, thereby achieving the fixation of the telescopic section 1 and the pedal to form a complete telescopic ladder section. This is repeated to pull the required number of telescopic sections 1 to move upward to form a ladder rack of the required height.

[0051] When the ladder frame needs to be folded and retracted, the knob 25 is manually pulled to move, and the knob 25 drives the locking rod 24 to translate until the locking rod 24 exits the locking hole of the telescopic section 1, and then the telescopic section 1 is manually pressed down so that the locking hole on the telescopic section 1 is staggered with the locking rod 24. At this time, the knob 25 can be manually loosened, and the locking rod 24 is pressed against the outer wall of the telescopic section 1 under the drive of the return spring 26. This is repeated to achieve the folding and retraction of each telescopic section 1.

[0052] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A multifunctional telescopic ladder, characterized by: include A pair of hinged ladder frames, the ladder frames comprising a plurality of telescopic ladder sections sequentially distributed from top to bottom, the telescopic ladder sections comprising a pair of telescopic sections and a pedal connected between the two telescopic sections, the pedal being fixed to the telescopic section by the cooperation of a locking assembly; In the two adjacent telescopic ladder sections, the telescopic section constituting the upper telescopic ladder section is defined as the upper telescopic section, and the telescopic section constituting the lower telescopic ladder section is defined as the lower telescopic section. The upper telescopic section is sleeved in the lower telescopic section, and the upper telescopic section moves up and down along the inner wall of the lower telescopic section. Among the telescopic ladder sections constituting the same ladder frame, the telescopic ladder section constituting the lowermost telescopic ladder section is defined as a fixed ladder section; A first base is provided at the bottom end of the fixed ladder section of one of the ladder frames, the first base comprises a first sleeve respectively sleeved on the outer wall of the bottom of the two fixed ladder sections, the bottom surface of the first sleeve is an arc surface, and a plurality of grooves are formed on the bottom surface of the first sleeve, so that a plurality of supporting convex ribs are formed on the bottom surface of the first sleeve; A second base is provided at the bottom end of the fixed ladder section of the other ladder frame, and the second base includes a supporting rod and a second sleeve connected to both sides of the supporting rod. A fixing groove for accommodating the supporting rod to be embedded and fixed is also provided at the bottom ends of the two fixed ladder sections. The second sleeves are respectively located on the outsides of the two fixed ladder sections. The bottom surface of the second sleeve is a V-shaped surface, and a plurality of grooves are provided on the bottom surface of the second sleeve, so that a plurality of supporting ribs are formed on the bottom surface of the second sleeve.

2. The multifunctional telescopic ladder according to claim 1 is characterized in that: The pedal comprises a pedal body and connecting sections connected to both sides of the pedal body, wherein the connecting sections are ring-shaped and are directly sleeved on the outer wall of the telescopic joint; The locking assembly is as follows: a locking cavity is opened in the pedal body, a horizontally arranged locking rod and a locking sleeve for installing the locking rod are installed in the locking cavity, a cavity for installing and moving the locking rod is opened in the locking sleeve, a reset spring is also arranged between the locking rod and the locking sleeve, one side of the locking rod extends from the locking cavity and extends into the annular inner cavity of the connecting section, and at the same time, a movable hole for the locking rod to pass through is opened on the pedal body, and a plug hole for inserting the locking rod is opened on the telescopic joint, and a dial knob connected to the locking rod is also arranged on the outer wall of the pedal body.

3. The multifunctional telescopic ladder according to claim 2 is characterized in that: A limiting ring is also arranged on the outer wall of a section of the locking rod placed in the locking cavity, and the size of the outer wall of the limiting ring is larger than the size of the movable hole on the pedal body.

4. The multifunctional telescopic ladder according to claim 2, characterized in that: A positioning component is also provided between the telescopic joint and the connecting section. The positioning component is as follows: a positioning hole is also provided on the outer wall of the telescopic joint, a positioning protrusion embedded in the positioning hole is also provided on the connecting section, and an installation hole for accommodating the installation of the positioning protrusion is opened on the connecting section, an elastic plate is installed in the installation hole, and the positioning protrusion is installed on the elastic plate.

5. The multifunctional telescopic ladder according to claim 1 is characterized in that: The support rod is fixed to the fixed ladder section by the cooperation of bolts and nuts. A plurality of circular through holes distributed up and down for the bolts to pass through are opened at the bottom end of the fixed ladder section, and a waist-shaped through hole for the bolts to pass through is opened on the support rod.

6. The multifunctional telescopic ladder according to claim 1, characterized in that: A limiting protrusion is also arranged on the outer wall of the fixed ladder section.

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