Foldable lifting herringbone ladder

Abstract

The utility model relates to a foldable lifting herringbone ladder which comprises a frame A and a frame B. The top end of the frame A is hinged to the top end of the frame B through a rotating shaft. The device is characterized in that each of the frame A and the frame B comprises a bottom frame, a lifting frame and a U-shaped limiting pin; the mode that the lifting frame is matched with the bottom frame is adopted for lifting of the herringbone ladder, the bottom frame is of a channel steel structure for containing the lifting frame in an embedded mode, the U-shaped pins are adopted between the bottom frame and the lifting frame for limiting, fixing of the bottom frame and the lifting frame after height adjustment is guaranteed, and the fixing mode of the U-shaped pins is simpler, more convenient and faster. The connection strength is high; in addition, the bottom end of the bottom frame is expanded towards the outer side, so that lateral stress support is increased, and the stability of the whole herringbone ladder is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of herringbone ladders, in particular to a foldable and liftable herringbone ladder. Background Art

[0002] The early herringbone ladder includes two fixed ladders and a positioning device arranged between the two fixed ladders. The top ends of the two fixed ladders are rotatably connected. The two fixed ladders can be opened to form a herringbone ladder or folded to form a straight ladder. The herringbone ladder is an independent ladder and is widely used. However, since the two fixed ladders cannot be adjusted in the length direction, the herringbone ladder has the following disadvantages: it can only be used in places flush with the ground, and the use of the herringbone ladder is greatly limited in steps or uneven places.

[0003] The common liftable herringbone ladder is troublesome to adjust and has poor stability. Therefore, a liftable herringbone ladder structure is needed to meet the height adjustment requirements and the requirements of convenient adjustment of the ladder. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a foldable lifting herringbone ladder, which can solve the problems of inconvenient adjustment and poor stability of traditional lifting herringbone ladders.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a foldable lifting ladder, comprising a frame A and a frame B, wherein the top end of the frame A is hingedly connected with the top end of the frame B through a rotating shaft; the innovation point is that the frame A and the frame B both comprise a bottom frame, a lifting frame and a U-shaped limit pin;

[0006] The bottom frame includes a first side frame and a first pedal rod; the first side frame has a pair of symmetrically arranged first side frames, the cross section of the first side frame is a U-structure to form a guide groove, and the opening directions of the two first side frames are arranged oppositely; a connecting hole for accommodating a U-shaped limit pin to pass through is opened near the top of the first side frame; there are a plurality of first pedal rods, and the first pedal rods are distributed between the two first side frames along the vertical direction; the end of the first pedal rod is connected to the side wall of the first side frame; both ends of the first pedal rod are opened along the axial direction with a first limit pin hole for accommodating the pin shaft to be embedded;

[0007] The lifting frame includes a second side frame and a second pedal rod; the second side frames have a pair and are arranged parallel to each other; the second side frame is provided with a through hole in the vertical direction for accommodating the horizontal installation of the second pedal rod; the bottom end of the second side frame is embedded from the top end of the first side frame, and the second side frame can be lifted and lowered along the extension direction of the guide groove formed by the U-shaped structure of the first side frame; there are a plurality of second pedal rods, and the second pedal rods are distributed between the two second side frames along the vertical direction, and the end of the second pedal rod is embedded in the through hole of the second side frame; the end of the second pedal rod is provided with a second limit pin hole along the axial direction;

[0008] One end of the U-shaped limit pin is embedded in the first limit pin hole at the end of the first pedal rod installed on the top end of the first side frame, and the other end of the U-shaped limit pin passes through the connecting hole near the end of the first side frame and is embedded in the second limit pin hole at the end of the second pedal rod installed on the second side frame.

[0009] Furthermore, the first side frame includes a vertical section and an inclined section, and the inclined section is connected to the bottom end of the vertical section; the vertical section and the inclined section are both channel steel structures; the inclined section is inclined outward, and the distance between the two first side frames gradually increases from top to bottom at the inclined section; an anti-slip rubber sleeve is embedded at the bottom end of the inclined section.

[0010] Furthermore, a stop threaded hole connected to the first limit pin hole is opened at a position near the end of the first pedal rod perpendicular to the axial direction, and a bolt is arranged in the stop threaded hole to lock the U-shaped limit pin in the first limit pin hole to prevent the U-shaped limit pin from detaching from the first limit pin hole.

[0011] The advantages of the utility model are:

[0012] 1) In the utility model, a lifting frame and a bottom frame are used to lift the stepladder, wherein the bottom frame adopts a channel steel structure to accommodate the lifting frame, and a U-shaped pin is used to limit the bottom frame and the lifting frame to ensure the fixation of the bottom frame and the lifting frame after the height is adjusted. The fixing method of the U-shaped pin is simpler and more convenient, and has a high connection strength. In addition, the bottom end of the bottom frame is extended outward to increase lateral force support and improve the stability of the entire stepladder. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0014] Figure 1 The utility model is a three-dimensional structural diagram of a foldable lifting herringbone ladder. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme 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. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] like Figure 1 The foldable lifting stepladder shown includes a frame A1 and a frame B2, and the top of the frame A1 is hingedly connected to the top of the frame B2 via a rotating shaft; the frame A1 and the frame B2 both include a bottom frame 3, a lifting frame 4 and a U-shaped limit pin 5.

[0018] The bottom frame 3 includes a first side frame 31 and a first pedal rod 32; the first side frame 31 has a pair of symmetrically arranged first side frames, the cross-section of the first side frame 31 is a U-structure to form a guide groove, and the opening directions of the two first side frames 31 are arranged opposite to each other; a connecting hole for accommodating the U-shaped limit pin 5 to pass through is opened near the top position on the first side frame 31; there are a plurality of first pedal rods 32, and the first pedal rods 32 are distributed between the two first side frames 31 along the vertical direction; the ends of the first pedal rod 32 are connected to the side walls of the first side frame 31; the two ends of the first pedal rod 32 are opened along the axial direction with first limit pin holes for accommodating the pin shaft to be embedded.

[0019] The lifting frame 4 includes a second side frame 41 and a second pedal rod 42; the second side frame 41 has a pair of and is arranged parallel to each other; the second side frame 41 is provided with a through hole in the vertical direction to accommodate the horizontal installation of the second pedal rod 42; the bottom end of the second side frame 41 is embedded from the top end of the first side frame 31, and the second side frame 41 can be raised and lowered along the extension direction of the guide groove formed by the U-shaped structure of the first side frame 31; there are a plurality of second pedal rods 42, and the second pedal rods 42 are distributed between the two second side frames 41 along the vertical direction, and the end of the second pedal rod 42 is embedded in the through hole of the second side frame 41; the end of the second pedal rod 42 is provided with a second limit pin hole along the axial direction.

[0020] One end of the U-shaped limit pin 5 is embedded in the first limit pin hole at the end of the first pedal rod 32 installed on the top end of the first side frame 31, and the other end of the U-shaped limit pin 5 passes through the connecting hole near the end of the first side frame 31 and is embedded in the second limit pin hole at the end of the second pedal rod 42 installed on the second side frame 41.

[0021] The first side frame 31 includes a vertical section and an inclined section, and the inclined section is connected to the bottom end of the vertical section; the vertical section and the inclined section are both channel steel structures; the inclined section is inclined outward, and the distance between the two first side frames 31 gradually increases from top to bottom at the inclined section; an anti-slip rubber sleeve is embedded at the bottom end of the inclined section.

[0022] At a position near the end of the first pedal 32, a stop threaded hole connected to the first limit pin hole is opened perpendicular to the axial direction, and a bolt is arranged in the stop threaded hole to lock the U-shaped limit pin 5 in the first limit pin hole to prevent the U-shaped limit pin 5 from escaping from the first limit pin hole.

[0023] The working principle of the utility model is: for the lifting of the herringbone ladder, a lifting frame and a bottom frame are matched, wherein the bottom frame adopts a channel steel structure to accommodate the lifting frame for embedding, and a U-shaped pin is used for limiting between the bottom frame and the lifting frame to ensure the fixation of the bottom frame and the lifting frame after the height is adjusted. The fixing method of the U-shaped pin is simpler and more convenient, and the connection strength is high; in addition, the bottom end of the bottom frame is expanded outward to increase lateral force support and improve the stability of the entire herringbone ladder.

[0024] Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements shall fall within the scope of the present invention to be protected.

Claims

1. A foldable lifting ladder, comprising a frame A and a frame B, wherein the top of the frame A is hingedly connected to the top of the frame B via a rotating shaft; characterized in that: The frame A and the frame B both include a bottom frame, a lifting frame and a U-shaped limit pin; The bottom frame includes a first side frame and a first pedal rod; the first side frame has a pair of symmetrically arranged first side frames, the cross section of the first side frame is a U-structure to form a guide groove, and the opening directions of the two first side frames are arranged oppositely; a connecting hole for accommodating a U-shaped limit pin to pass through is opened near the top of the first side frame; there are a plurality of first pedal rods, and the first pedal rods are distributed between the two first side frames along the vertical direction; the end of the first pedal rod is connected to the side wall of the first side frame; both ends of the first pedal rod are opened along the axial direction with a first limit pin hole for accommodating the pin shaft to be embedded; The lifting frame includes a second side frame and a second pedal rod; the second side frames have a pair and are arranged parallel to each other; the second side frame is provided with a through hole in the vertical direction for accommodating the horizontal installation of the second pedal rod; the bottom end of the second side frame is embedded from the top end of the first side frame, and the second side frame can be lifted and lowered along the extension direction of the guide groove formed by the U-shaped structure of the first side frame; there are a plurality of second pedal rods, and the second pedal rods are distributed between the two second side frames along the vertical direction, and the end of the second pedal rod is embedded in the through hole of the second side frame; the end of the second pedal rod is provided with a second limit pin hole along the axial direction; One end of the U-shaped limit pin is embedded in the first limit pin hole at the end of the first pedal rod installed on the top end of the first side frame, and the other end of the U-shaped limit pin passes through the connecting hole near the end of the first side frame and is embedded in the second limit pin hole at the end of the second pedal rod installed on the second side frame.

2. The foldable lifting ladder according to claim 1, characterized in that: The first side frame includes a vertical section and an inclined section, and the inclined section is connected to the bottom end of the vertical section; the vertical section and the inclined section are both channel steel structures; the inclined section is inclined outward, and the distance between the two first side frames gradually increases from top to bottom at the inclined section; an anti-slip rubber sleeve is embedded at the bottom end of the inclined section.

3. The foldable lifting ladder according to claim 1, characterized in that: A stop threaded hole connected to the first limit pin hole is opened at a position near the end of the first pedal rod perpendicular to the axial direction, and a bolt is arranged in the stop threaded hole to lock the U-shaped limit pin in the first limit pin hole to prevent the U-shaped limit pin from escaping from the first limit pin hole.

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