A lifting device for snowshoes

Abstract

A lifting device for snowshoes includes a support rod, the support rod being a U-shaped metal rod with left and right sides bent downward. A heel pedal is provided on the shoe upper, and the support rod is rotatably mounted on the shoe upper around the heel pedal. The device is characterized in that the left and right sides of the shoe upper have positioning slots for the ends of the support rod to pass through and lift the shoe into position. The ends of the support rod pass downward through the positioning slots and are directly or indirectly rotatably connected to a transverse metal plate with rear teeth fixed to the shoe frame. The present invention has a simple and reasonable structure, provides secure and stable positioning, and enhances the strength of the shoe frame. It not only meets the requirements of light, safe, and non-slip walking on snow, but also facilitates mountaineering, making it suitable for snow sports enthusiasts.

Description

Technical Field

[0001] The invention relates to an outdoor sports article, in particular to a lifting device for snowshoes. Background Art

[0002] Snowshoes, also known as snow paws, bear paw shoes, snowshoes, and snow boots, are footwear used for walking on snow. By distributing the body's weight over a larger area, they prevent the foot from sinking completely into the snow. Traditional snowshoes are constructed with a hardwood frame woven with rawhide leather straps, making them cumbersome and prone to falling off. Traditional snowshoes typically consist of a frame, upper, teeth, and a tread. For comfort, they often feature a heel pad or heel pedal at the rear of the upper, but lack a lift, making climbing more tiring.

[0003] Upon investigation, it was found that snowshoes with lifting devices have also appeared, such as the Chinese patent No. 200480003338.7 "Frame and buckle for snowshoes and related systems and methods". This snowshoe includes a lifter to help people climb mountains. The lifter includes a rod that is pivotally mounted on a peripheral component (i.e., a shoe frame) and maintained in an extended position. The rod is suspended above the base plate. The lifter includes a lifter mounting member that pivotally holds the rod. When the rod is so set and fixed to the peripheral component with rivets, the rod remains in an extended position. In the extended position, the rod can support the heel of a person's boot above the base plate so that the rod can form an angle relative to the base plate. This snowshoe structure lacks a heel pad, only a lifter to elevate the heel, but lacks a specific heel-lifting positioning structure. Furthermore, as shown in the attached figure, the rod is rotated approximately 120 degrees forward, so the support point for the sole of the foot is not at the heel but rather forward, causing fatigue and discomfort. Furthermore, the rod is fixed to the surrounding components on both sides and is very wide, relying solely on the crossbar for heel support, which can easily cause slippage. Furthermore, in this state, the rod is prone to deformation and breakage. Therefore, further structural improvements are needed.

[0004] Another Chinese patent, patent number 201320724866.8, discloses an alpine snowshoe comprising a frame and a covering stretched across the frame. The frame has a band-shaped, circumferential sidewall oriented transversely to the horizontal. This utility model proposes a climbing aid bow (similar to a lifting device) that can be pivotally mounted on the frame between two brackets fixed to the sidewalls. Although its serrations are transversely connected to the frame, the locking mechanism for the climbing aid bow is mounted on a separate sheet metal bracket, which is in turn fixed to the inside of the frame. This complicates the bracket and hinders manufacturing. Furthermore, the serrations, which are only transversely connected to the frame, lack strength and could be improved.

[0005] Moreover, the above two patented frames are made of plates, which are relatively heavy and inconvenient to carry and use, resulting in high raw material costs. The frame strength and support strength of the same weight are weak, and the side wall's ability to break ice and snow is not strong enough. Since the frame cross-section is basically unchanged, it cannot change with the thickness of the ice and snow layer, so its stability cannot be properly adjusted by itself. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a snowshoe lifting device with a simple and reasonable structure, good supporting strength and convenient positioning in response to the above-mentioned technical status quo.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a lifting device for snow boots, the lifting device includes a support rod, which is a U-shaped metal rod with left and right sides bent downward, a heel pedal is provided on the upper of the shoe, and the support rod is arranged on the upper of the shoe so as to be rotatable up and down around the heel pedal. It is characterized in that: positioning slots are provided on the upper of the shoe on the left and right sides of the heel pedal for the two ends of the support rod to pass through and lift and position, and the two ends of the support rod pass downward through the positioning slots and are directly or indirectly rotatably connected to a horizontal metal plate fixed on the shoe frame and having rear teeth.

[0008] Furthermore, the transverse metal plate is fixed to the lower end of the shoe frame corresponding to the bottom of the heel pedal, and the bent ends on both sides of the support rod pass downward through the positioning slots and are rotatably connected to the connecting plate fixed on the transverse metal plate.

[0009] Furthermore, the connecting plate is a U-shaped metal plate, which is fixed to the rear side of the horizontal metal plate by riveting, screwing or welding. Axial holes are provided on the left and right sides of the connecting plate. The ends of the bent ends on the left and right sides of the support rod are bent inward to form connecting short shafts that are connected and rotated with the axle holes. The support rod passes through the axle holes through the connecting short shafts on both sides and is rotatably connected to the connecting plate.

[0010] Preferably, the heel pedal has an isosceles trapezoidal structure, and the positioning slots on the left and right sides of the heel pedal have two front and rear limit slots. When the support rod falls on the front limit slot, the support rod is in a raised state, forming an angle with the heel pedal. When the support rod falls on the rear limit slot, the support rod is set on the shoe upper and is basically flush with the heel pedal.

[0011] Furthermore, the heel pedal is a plastic part, and the heel pedal and the upper are made into an integral part, or the heel pedal is fixed to the upper by riveting or screwing, and the upper end surface of the heel pedal is formed with multiple convex strips for easy pedaling.

[0012] Preferably, the rear crossbar of the support rod is a corrugated crossbar.

[0013] Furthermore, the shoe frame structure includes a shoe frame and a tail connector, wherein the shoe frame is made of a metal pipe with a triangular cross-section, and has an open rear end, a basically horizontal middle part, and upturned ends. The tail connector is fixedly connected to the rear end opening position of the shoe frame, and the upper end surface of the shoe frame is the mounting surface for mounting the upper. The lower end of the shoe frame is basically in the shape of a triangular tip, and a number of side teeth are arranged at intervals at the bottom of the triangular tip structure at the lower end of the shoe frame to increase the anti-slip effect.

[0014] Preferably, the tail connector is a V-shaped structure or a U-shaped structure with an arc transition shape, and the tail connector is arranged at the rear end opening position of the shoe frame by plugging, screw connection, riveting or welding to form a closed ring.

[0015] Furthermore, both ends of the tail connector are provided with plug-in parts that cooperate with the triangular holes of the metal pipe with a triangular cross-section at the opening of the shoe frame. The tail connector is fixed to the rear end of the shoe frame through size matching, and the middle part of the upper end surface of the tail connector is provided with a connecting part that is riveted or screwed to the rear end of the shoe upper.

[0016] Preferably, the metal tube with a triangular cross-section has an isosceles triangle or a right triangle cross-section. When the cross-section is an isosceles triangle, the bottom side serves as the upper end face of the shoe frame, the top angle serves as the lower end of the shoe frame, and the side teeth are arranged on the top angle end. When the cross-section is a right triangle, one of the right-angled sides serves as the upper end face of the shoe frame, the acute angle of the other right-angled side serves as the lower end of the shoe frame, the right-angled side serves as the inner side face of the shoe frame, and the side teeth are arranged on the inner side face of the shoe frame.

[0017] Furthermore, the bottom of the transverse metal plate is formed with bottom thorns as rear teeth, and side flanges extend from the left and right sides of the transverse metal plate, and the side flanges are fixed to the inner wall of the shoe frame by screw connection, riveting connection or welding connection.

[0018] Finally, the shoe upper is fixed to the upper end of the shoe frame by riveting or screwing. The shoe upper adopts a hard plastic base plate and a soft plastic panel, or other materials such as a kayak mask and the like.

[0019] Compared with the prior art, the advantages of the present invention are as follows: a liftable support rod is provided on the upper, the support rod can be lifted and lowered, and a positioning slot is provided on the upper, so that the support rod can be quickly positioned when it is lifted, and the positioning slot is easy to make; the heel pedal can be integrated with the upper, or fixed to the upper by riveting or screwing, and the heel pedal can be used as a heel pad when walking on flat ground, and can be used as a positioning frame for the support rod when climbing; the shoe frame is made of a metal pipe with a triangular cross-section as the main body, which is light in weight and has good strength, and the upper end surface of the shoe frame is flat, and the upper can be fixed by rivets or screws Alternatively, the shoe frame can be welded and fixed to the upper end surface, while the tooth piece can be easily installed and fixed to the side surface of the shoe frame, which is convenient to install and firm and stable. The lower end of the shoe frame is triangular in shape, which has a small contact area with the ground and low dragging friction. In addition, the shoe frame can penetrate the ice and snow layer to different depths depending on the softness or hardness of the ice and snow, thereby being able to self-adjust the penetration depth to a certain extent, thereby improving skiing stability. A rear tooth piece is arranged horizontally at the bottom of the shoe frame, and a U-shaped connecting plate is fixed to the rear tooth piece, which increases the anti-slip effect when walking on snow and is not easy to fall. Moreover, the reasonable installation of the rear tooth piece and the connecting plate can greatly improve the strength of the shoe frame and ensure a firm and stable connection. The present invention has a simple and reasonable structure, is not only light in weight and easy to carry, but also has high strength and is firmly and stably installed. Walking on snow is light, safe, and anti-slip, and is suitable for snow sports enthusiasts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a three-dimensional diagram of a snowshoe using the shoe frame structure according to an embodiment of the present invention;

[0021] Figure 2 This is the second three-dimensional diagram of a snowshoe using the shoe frame structure according to an embodiment of the present invention;

[0022] Figure 3 This is a three-dimensional exploded view of a snowshoe using the shoe frame structure according to an embodiment of the present invention;

[0023] Figure 4 This is one of the exploded views of the shoe frame structure of the embodiment;

[0024] Figure 5 This is the second exploded view of the shoe frame structure of the embodiment;

[0025] Figure 6 is a three-dimensional diagram of a shoe frame according to an embodiment;

[0026] Figure 7 is a three-dimensional exploded view of the shoe frame of the embodiment;

[0027] Figure 8 is a cross-sectional view of a shoe frame according to an embodiment;

[0028] Figure 9 This is a perspective view of the connection structure between the front gear and the upper of the embodiment;

[0029] Figure 10 This is the second stereoscopic view of the connection structure between the front gear and the upper of the embodiment;

[0030] Figure 11 This is one of the three-dimensional exploded views of the connection structure between the front gear and the upper in the embodiment;

[0031] Figure 12 This is the second exploded perspective view of the front gear and shoe upper connection structure in the embodiment; DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0033] like Figures 1 to 4 As shown, a snowshoe using the lifting device of the present invention includes a shoe frame 1, an upper 6, shoe teeth and an upper 5. The upper 6 is fixed to the upper end surface of the shoe frame 1 by rivets. The upper 6 adopts a hard plastic base and a soft plastic panel. The shoe teeth are arranged under the shoe frame 1. The upper 5 has an upper body, and the upper body is provided with components such as a heel strap 51, a drawstring 52 and a buckle 53.

[0034] The lifting device of the present invention includes a support rod 101, which is a U-shaped metal rod with left and right sides bent downward. The rear cross bar of the support rod 101 is a corrugated cross bar. A heel pedal 7 is provided on the shoe upper 6. The support rod 101 is arranged on the shoe upper 6 so as to be rotatable up and down around the heel pedal 7. The shoe teeth include side teeth 3, front teeth 9 and rear teeth 8. Positioning slots 62 are provided on the shoe upper 6 on the left and right sides of the heel pedal 7 for the two ends of the support rod 101 to pass through and lift and position. The two ends of the support rod 101 pass downward through the positioning slots 62 and are directly or indirectly rotatably connected to the horizontal metal plate 82 fixed laterally on the shoe frame 1 and having rear teeth.

[0035] The specific structure is as follows: the heel pedal 7 is a plastic component with an isosceles trapezoidal structure. The upper end surface of the heel pedal 7 is formed with multiple protrusions 71 for easy pedaling. The heel pedal 7 is fixed to the upper 6 by rivets. The left and right sides of the heel pedal 7 are recessed with concave surfaces corresponding to the positioning slot 62. The positioning slot 62 has two front and rear limiting notches 621 and 622. When the support rod 101 is located in the front limiting notch 621, the support rod 101 is in a raised state, forming an angle with the heel pedal 7 that is no greater than 90°. When the support rod 101 is located in the rear limiting notch 622, the support rod 101 is located on the upper 6 and is substantially flush with the heel pedal 7. The transverse metal plate 82 of the rear toothed member 8 is transversely fixed to the lower end of the shoe frame 1, corresponding to the lower front end of the heel pedal 7. The bent ends of the support rod 101 downwardly pass through the positioning slot 62 and are rotatably connected to the connecting plate 102 fixed to the transverse metal plate 82. The connecting plate 102 is preferably a U-shaped metal plate, a connecting hole is opened in the middle of the connecting plate 102, and a corresponding through hole is opened in the middle of the transverse metal plate 82. The connecting plate 102 is fixed to the rear side of the transverse metal plate 82 by rivet connection, screw connection or welding connection. Axial holes are provided on the left and right sides of the connecting plate 102, and the ends of the bent ends on the left and right sides of the support rod 101 are bent inward to form connecting short shafts that cooperate with the axle holes and rotate. The support rod 101 passes through the axle holes through the connecting short shafts on both sides to achieve rotational connection with the connecting plate 102.

[0036] The shoe frame structure of this embodiment includes a shoe frame 1 and a tail connector 2. Figure 6 、 7 The shoe frame 1 is made of a metal pipe with a triangular cross-section, and has a U-shaped structure with a rear end opening 11, a substantially horizontal middle portion, and upwardly curved ends. The metal pipe with a triangular cross-section can be made of aluminum alloy, stainless steel, or steel. The tail connector 2 is fixedly connected to the rear end opening of the shoe frame 1 to form a closed ring-shaped shoe frame. The upper end surface of the shoe frame 1 is a mounting surface 13 for mounting the upper 6. The mounting surface 13 is usually flat to facilitate the installation of the upper 6 and improve the connection strength. The lower end of the shoe frame 1 is a triangular tip, see Figure 8 At the bottom of the triangular tip structure at the lower end of the shoe frame 1, a number of side teeth 3 are installed at intervals to increase the anti-slip effect.

[0037] The head of the shoe frame 1 is bent upward at an angle of 15° to 45°, the middle portion of the shoe frame 1 is substantially horizontal, and the tail portion of the shoe frame 1 is bent upward at an angle of 5° to 30°. The width of the head portion of the shoe frame 1 is greater than the width of the tail portion, and the shoe frame 1 gradually narrows. The tail connector 2 is a V-shaped or U-shaped structure with a circular arc transition. The cross-sectional shape of the tail connector 2 is substantially consistent with the cross-sectional shape of the metal pipe, so that adjacent portions thereof can transition substantially flush. The tail connector 2 is disposed at the rear end opening 11 of the shoe frame 1 by means of a plug-in connection, screw connection, rivet connection, or welding connection. This embodiment utilizes a plug-in connection, so that in this embodiment, both ends of the tail connector 2 are provided with protruding plug-in portions 21 that mate with the triangular opening of the triangular cross-sectional metal pipe of the shoe frame 1. The tail connector 2 is plug-in fixed to the rear end of the shoe frame 1 by dimensional matching. A connecting portion 22 is provided in the middle of the upper end surface of the tail connector 2, which is riveted to the rear end of the shoe upper 6. The cross section of the metal pipe with a triangular cross section is preferably an isosceles triangle or a right triangle cross section, with a certain arc transition at the corner tip to avoid injury. This embodiment uses a metal pipe with a right triangle cross section, see Figure 8 , one right-angled side serves as the mounting surface 13 of the shoe frame 1, and the acute angle 14 of the other right-angled side serves as the lower end of the shoe frame 1, and the side tooth member 3 is fixed on the inner side of the right-angled side of the acute angle. The side tooth members 3 are distributed between the head bent end and the rear bent end of the shoe frame 1, and the lower end of the side tooth member 3 has a tooth-like structure with a pointed tip and a high and low interval distribution. The side tooth member 3 can be fixed to the inner side surface of the shoe frame 1 by welding, screw connection or riveting connection, and is connected to the inner side surface of the shoe frame 1 to form an integrated structure. In this embodiment, the side tooth member 3 is divided into a front first side tooth 30 and a rear second side tooth 31. The front first side tooth 30 and the rear second side tooth 31 are symmetrically installed on both sides of the shoe frame 1. The front first side tooth 30 and the rear second side tooth 31 are arranged one in front and one in back on one side of the shoe frame. A mounting hole 12 is provided on the vertical right-angled side of the triangular metal pipe of the shoe frame 1 to facilitate the side tooth member 3 to be riveted to the inner side surface of the shoe frame.

[0038] like Figures 9-12The front tooth piece 9 is horizontally arranged between the front inner walls of the shoe frame 1. The position of the shoe upper 6 corresponding to the front tooth piece 9 is provided with a hollow portion 61. The hollow portion 61 is generally trapezoidal in shape, with arc transitions at the corners. The main body of the front tooth piece 9 is a metal plate 90. Three first front teeth 91 and two second front teeth 92 are bent and pressed out of the front and back of the metal plate respectively. The first front teeth 91 and the second front teeth 92 both have bottom teeth of different heights. A horizontal local axis hole 93 is pressed out of the middle part of the metal plate of the front tooth piece 9. The metal plate of the front tooth piece 9 is riveted to the bottom of the front end of the shoe upper 5 and fixed at the front tooth piece 9. A mounting sleeve hole is formed between the metal plate and the bottom of the upper 5. A metal cross bar 4 passes through the mounting sleeve hole and is connected to the axial hole 15 on the front inner wall of the shoe frame 1. In order to improve the strength of the shoe frame, the axial hole 15 is usually opened on the overlapping part of the side gear 3 and the shoe frame 1. A shaft sleeve 41 is sleeved in the middle of the metal cross bar 4. The front gear 9 is rotatably connected to the shoe frame 1 through the shaft sleeve 41 and the metal cross bar 4. Usually, in order to limit the movement of the front gear 9 on the metal cross bar 4, limit sleeves 42 are respectively sleeved on the left and right ends of the metal cross bar 4, and each limit sleeve 42 is sleeved between the shaft sleeve 41 and the side of the shoe frame 1.

[0039] like Figure 2 、 4 5, the rear tooth member 8 is fixedly disposed transversely between the inner walls of the middle and rear portions of the shoe frame 1. The rear tooth member 8 comprises a transverse metal plate 82, the bottom of which is formed with a bottom spike, employing a spur-tooth structure. The bottom spikes are of substantially the same height. Side flanges 81 extend from the left and right sides of the transverse metal plate 82, each having mounting holes formed therein. The side flanges 81 are secured to the inner wall of the shoe frame 1 via connectors such as rivets or screws. The front first side teeth 30 and the rear second side teeth 31 are symmetrically arranged in two front and rear sections. The rear second side teeth 31 are integrally formed with the rear tooth member 8. The lower ends of the side flanges 81 of the rear tooth member 8 are folded outwardly to align substantially vertically with the bottom of the shoe frame 1, and the side spikes are formed at the bottom. The front first side teeth 30 are disposed on the left and right sides of the front portion of the shoe frame 1, corresponding to the positions of the front teeth 9. The front first side teeth 30 comprise a metal plate. The upper end of the metal plate has a through hole corresponding to the mounting hole 12 of the shoe frame 1. The lower end of the metal plate is folded outward to be substantially vertically aligned with the bottom of the shoe frame 1, and is formed with side teeth at the bottom. The front first side teeth 30 are fixed to the side of the shoe frame 1 via connectors such as rivets or screws. In this way, the side teeth 3, the front teeth 9, and the rear teeth 8 provide safety and anti-slip functions, making it less likely to fall when walking on snowy surfaces. Furthermore, the side teeth 3 enhance the mounting strength between the shoe frame 1 and the metal crossbar 4, while the rear teeth 8 enhance the strength of the shoe frame 1. Of course, the shoe frame 1 is not limited to a single-piece structure made of triangular-cross-section metal tubing. The shoe frame 1 can also be a two-piece structure formed by welding two left and right sections, with the metal crossbar 4 connecting the left and right sections to strengthen the structure.

[0040] During installation, first install the front first side tooth 30 in the shoe frame 1, and fix the front tooth part 9 to the front bottom of the shoe upper 5 by riveting. When fixing, first install the metal cross bar 4 and the shaft sleeve 41, and then install it through the mounting hole to rotate with the shoe frame 1, then plug and fix the tail connector 2 to the shoe frame 1, and then install the rear tooth part 8 to the shoe frame, and then fix the upper 6 to the shoe frame 1 by rivets, and then install the heel pedal 7 on the upper 6, and the lifting device 10 is ready.

[0041] When in use, place the shoe on the treading surface of the upper 6, insert it into the upper 5 and fix it, then you can walk on the snow. Since the shoe frame 1 is made of a metal pipe with a triangular cross-section, it is light in weight and has good strength. In addition, the contact area with the ground is small, the dragging friction is small, and walking is lighter. It is convenient to set and fix various teeth, and the fixation is firm and reliable and not easy to loosen. In addition, due to the provision of the side teeth 3, the front teeth 9 and the rear teeth 8, the anti-skid effect is good, it is not easy to fall, and walking is safer. The entire shoe frame is strong and not easy to deform. The addition of a reasonable lifting device facilitates manufacturing, improves the strength of the frame, and extends the service life of the snow boots.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A snowshoe lifting device, comprising a support rod, the support rod being a U-shaped metal rod with left and right sides bent downward, a heel pedal being provided on the upper surface, the support rod being rotatably disposed about the heel pedal on the upper surface, and characterized in that: Positioning slots are provided on the left and right sides of the shoe upper for the support rods to pass through and be raised for positioning. The two ends of the support rods pass downward through the positioning slots and are directly or indirectly rotatably connected to a horizontal metal plate with rear teeth fixed to the shoe frame. The positioning slots on the left and right sides of the heel pedal have two front and rear limit slots. When the support rod falls on the front limit slot, the support rod is in a raised state and forms an angle with the heel pedal. When the support rod falls on the rear limit slot, the support rod is set on the shoe upper and is basically flush with the heel pedal.

2. The lifting device according to claim 1, characterized in that: The transverse metal plate is fixed to the lower end of the shoe frame corresponding to the bottom of the heel pedal, and the bent ends on both sides of the support rod pass downward through the positioning slots and are rotatably connected to the connecting plate fixed on the transverse metal plate.

3. The lifting device according to claim 2, characterized in that: The connecting plate is a U-shaped metal plate, which is fixed to the rear side of the horizontal metal plate by riveting, screwing or welding. Axial holes are provided on the left and right sides of the connecting plate. The ends of the bent ends on the left and right sides of the support rod are bent inward to form connecting short shafts that cooperate with the axle holes and rotate. The support rod passes through the axle holes through the connecting short shafts on both sides to achieve rotational connection with the connecting plate.

4. The lifting device according to claim 1, characterized in that: The heel pedal is in an isosceles trapezoidal structure.

5. The lifting device according to claim 4, characterized in that: The heel pedal is a plastic part, and the heel pedal and the upper are made into an integral part, or the heel pedal is fixed to the upper by riveting or screwing. The upper end surface of the heel pedal is formed with multiple convex strips for easy pedaling.

6. The lifting device according to claim 1, characterized in that: The rear cross bar of the support rod is a corrugated cross bar.

7. The lifting device according to claim 1, characterized in that: The shoe frame structure includes a shoe frame and a tail connector, wherein the shoe frame is made of a metal pipe with a triangular cross-section of the main body, and has an open rear end, a basically horizontal middle part, and upturned ends. The tail connector is fixedly connected to the rear end opening position of the shoe frame. The upper end surface of the shoe frame is the mounting surface for mounting the upper. The lower end of the shoe frame is basically in the shape of a triangular tip. At the bottom of the triangular tip structure at the lower end of the shoe frame, a number of side teeth are arranged at intervals to increase the anti-slip effect.

8. The lifting device according to claim 7, characterized in that: The tail connector is a V-shaped structure or a U-shaped structure with an arc transition shape. The tail connector is arranged at the rear end opening position of the shoe frame by plugging, screw connection, riveting or welding to form a closed ring.

9. The lifting device according to claim 8, characterized in that: Both ends of the tail connector are provided with plug-in parts that cooperate with the triangular holes of the metal pipe with a triangular cross-section at the opening of the shoe frame. The tail connector is fixed to the rear end of the shoe frame through size matching. The middle part of the upper end surface of the tail connector is provided with a connecting part that is riveted or screwed to the rear end of the shoe upper.

10. The lifting device according to claim 9, characterized in that: The metal pipe with a triangular cross-section has a cross-section of an isosceles triangle or a right triangle. When the cross-section is an isosceles triangle, the bottom side serves as the upper end face of the shoe frame, the top angle serves as the lower end of the shoe frame, and the side teeth are arranged on the top angle end. When the cross-section is a right triangle, one of the right-angled sides serves as the upper end face of the shoe frame, the acute angle of the other right-angled side serves as the lower end of the shoe frame, the right-angled side serves as the inner side face of the shoe frame, and the side teeth are arranged on the inner side face of the shoe frame.

11. The lifting device according to claim 1, characterized in that: The bottom of the transverse metal plate is formed with bottom teeth as rear teeth, and side flanges extend from the left and right sides of the transverse metal plate. The side flanges are fixed to the inner wall of the shoe frame by screw connection, riveting connection or welding connection.

12. The lifting device according to claim 1, characterized in that: The shoe upper is fixed to the upper end of the shoe frame by riveting or screwing, and the shoe upper adopts a hard plastic bottom plate and a soft plastic panel.

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