Guard mechanism for hoisting equipment drive device, chassis assembly and hoisting equipment

Abstract

The application relates to the technical field of engineering machinery, and discloses a protection mechanism for a driving device of a hoisting equipment, a chassis assembly and the hoisting equipment, which comprises a guard plate support for connecting a track frame, a pair of protection stop pieces which are detachably arranged on the two sides of the guard plate support and used for preventing the chain track from derailing, and a wear-resistant structure which is detachably arranged on the protection stop piece and used for reducing the wear of the protection stop piece and the chain track. The wear-resistant structure is arranged on the protection stop piece, and the protection stop piece is detachably installed on the two sides of the guard plate support, so that the traditional integral welded structure is adjusted into an assembled structure. On the basis of reserving the original mounting interface, the assembled gap requirement of the whole guard plate and the chain track can be met by reasonably arranging the protection stop piece and the wear-resistant structure, the original guard plate can be reused, the universal interchangeability is improved, the updating and maintenance cost is reduced, and the wear-resistant structure and the protection stop piece are designed to be detachable, so that the wear-resistant structure and the protection stop piece can be individually and conveniently replaced, and the maintenance cost is further reduced.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, specifically to a protective mechanism for a lifting equipment drive device, a chassis assembly, and the lifting equipment. Background Technology

[0002] In the chassis assembly of tracked cranes and other construction machinery, the flange of the support roller retainer is lower than that of the track chain, making the equipment prone to derailment during movement and turning. Therefore, track chain guards need to be installed on the track frame to prevent derailment. Existing track chain guards are mostly designed with integral welding, but in actual use, the continuous friction between the guard and the track chain causes track chain wear, a problem that has become a common pain point in the industry.

[0003] To address this pain point, the industry has adopted a solution of adding wear-resistant plates to welded track guards to reduce track wear. However, directly installing the wear-resistant plates would interfere with the track, requiring adjustments to the original mounting interfaces on the track frame and track guards, and re-drilling before assembly could be completed. This is not only cumbersome but also results in the new guards being incompatible with the original ones, adding extra cost. Utility Model Content

[0004] This application provides a protective mechanism, chassis assembly, and lifting equipment for the drive device of lifting equipment, in order to solve or improve the problem in the related art that after adding wear-resistant plates to welded track guard plates, it is necessary to re-drill holes for installation, which is cumbersome and results in the inability to interchange old and new guard plates, thus increasing additional cost.

[0005] In a first aspect, this application provides a protective mechanism for a lifting equipment drive device, comprising: Protective plate bracket, used for connection to the track frame; A pair of protective stops are respectively disposed on both sides of the guard plate bracket along the first direction. The protective stops are used to prevent the track from derailing, and the protective stops are detachably connected to the guard plate bracket. A wear-resistant structure is detachably disposed on the side of the pair of protective stops facing the track, the wear-resistant structure being used to reduce wear between the protective stops and the track.

[0006] In one optional embodiment, the wear-resistant structure includes: A pair of wear-resistant plates are provided and detachably connected to a pair of the aforementioned protective stops, the wear-resistant plates being located on the side of the protective stops facing the track.

[0007] In one optional embodiment, the wear-resistant plate is provided with at least two first mounting holes spaced apart along a second direction, and the protective stop is provided with at least two second mounting holes opposite to the first mounting holes; the protective mechanism further includes at least two first fixing members, which are sequentially inserted into the opposite second mounting holes and first mounting holes; And / or, the wear-resistant plate and / or the protective stop is provided with an arc-shaped surface on the side facing the track plate.

[0008] In one alternative implementation, it further includes: At least two pads are provided, each pad corresponding to a pair of protective stops, and the pads are detachably connected between the protective stops and the guard plate bracket.

[0009] In one optional embodiment, the guard plate bracket includes: A pair of first connecting plates extend along the first direction and are spaced apart along the second direction, the first connecting plates being used to connect to the track frame; A pair of second connecting plates are provided corresponding to a pair of first connecting plates, with the second connecting plates located on the side of the first connecting plates facing the track. Two pairs of third connecting plates are provided corresponding to one pair of second connecting plates. The pair of third connecting plates are respectively provided on both sides of the second connecting plate along the first direction. The protective baffle is detachably connected to the third connecting plate.

[0010] In one alternative embodiment, the second connecting plate is provided with a clearance portion for avoiding the track.

[0011] In one optional embodiment, the third connecting plate is provided with a third mounting hole, and the protective stop is provided with a fourth mounting hole opposite to the third mounting hole; The protective mechanism also includes a second fixing member, which is sequentially inserted into the corresponding fourth and third mounting holes.

[0012] In one alternative embodiment, the guard plate bracket is provided with a fifth mounting hole for connecting the track frame; And / or, the fifth mounting hole is configured as an oblong hole; And / or, the protective stop is provided with an arcuate groove for mounting the support roller.

[0013] Secondly, this application also provides a chassis assembly including a protective mechanism for a lifting equipment drive unit as described in any of the preceding claims.

[0014] Thirdly, this application also provides a lifting device, including the chassis assembly described above.

[0015] The protective mechanism for the drive device of lifting equipment provided in this application, by setting a wear-resistant structure on the protective stop and detachably installing the protective stop on both sides of the guard plate bracket, changes the traditional integral welded structure to an assembled structure. While retaining the original installation interface positions, the reasonable layout of the protective stop and the wear-resistant structure can meet the assembly clearance requirements between the guard plate and the track, eliminating the need for re-drilling, simplifying operation, and allowing the reuse of existing guard plates. This improves the versatility and interchangeability of the old and new guard plate structures, reducing replacement and maintenance costs. Furthermore, the detachable design between the wear-resistant structure and the protective stop facilitates individual disassembly and replacement without modifying other components, further reducing maintenance costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the protective mechanism for the drive device of lifting equipment according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the protective barrier according to an embodiment of this application; Figure 3 This is a schematic diagram of the wear-resistant plate according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the protective plate bracket according to an embodiment of this application; Figure 5 This is a schematic diagram of the operation of a protective mechanism for a lifting equipment drive device according to an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: 1. Protective plate bracket; 101. First connecting plate; 1011. Fifth mounting hole; 102. Second connecting plate; 1021. Clearance section; 103. Third connecting plate; 1031. Third mounting hole; 2. Protective stop; 201. Second mounting hole; 202. Fourth mounting hole; 203. Arc groove; 3. Wear-resistant structure; 301. Wear-resistant plate; 3011. First mounting hole; 4. First fastener; 5. Pad; 6. Second fastener; 7. Arc surface; 8. Track frame; 9. Track track; 10. Track plate; 11. Track roller. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] The following is combined Figures 1 to 4This application describes a protective mechanism, chassis assembly, and lifting equipment for a lifting equipment drive device according to embodiments of the present application.

[0024] According to embodiments of this application, in a first aspect, a protective mechanism for a lifting equipment drive device is provided, suitable for installation in the chassis assembly of engineering machinery such as crawler cranes and excavators. The protective mechanism includes a guard plate bracket 1, a pair of protective stops 2, and a wear-resistant structure 3. Specifically, as... Figure 1 and Figure 5 As shown, the guard plate bracket 1 is used to connect to the track frame 8 of the chassis assembly, and a pair of protective stops 2 are respectively arranged on both sides of the guard plate bracket 1 along a first direction. The protective stops 2 are used to prevent the track 9 from derailing, and the protective stops 2 are detachably connected to the guard plate bracket 1. The wear-resistant structure 3 is detachably arranged on the side of the pair of protective stops 2 facing the track 9. The wear-resistant structure 3 is used to reduce the wear between the protective stops 2 and the track 9, thereby extending the service life of the components. Specifically, during installation, the guard plate bracket 1 is connected and fixed to the track frame 8, and the guard plate bracket 1 spans the width direction of the track 9. Then, the protective stops 2 with the wear-resistant structure 3 are installed on the outer side of the end of the guard plate bracket 1, so that the two protective stops 2 form a rail clamping structure to prevent the track 9 from derailing. In this way, while using the original installation interface, the layout of the wear-resistant structure 3 and the protective stops 2 can be reasonably designed according to the actual installation requirements, so that the protective stops 2 with the wear-resistant structure 3 will not interfere with the track 9, and the assembly clearance requirements between the protective stops 2 and the track 9 are met. It should be noted that, in this embodiment, as Figure 1 As shown, the first direction is the width direction of the track 9; and in the first direction, the side facing the center of the track 9 is the inner side, and the side away from the center of the track 9 is the outer side.

[0025] This configuration, by incorporating a wear-resistant structure 3 on the protective stop 2 and detachably mounting the protective stop 2 on both sides of the guard plate bracket 1, transforms the traditional integral welded structure into a prefabricated structure. While retaining the original installation interface positions, the rational layout of the protective stop 2 and the wear-resistant structure 3 satisfies the assembly clearance requirements between the guard plate and the track 9, eliminating the need for re-drilling, simplifying operation, and allowing for the reuse of existing guard plates. This improves the versatility and interchangeability of the old and new guard plate structures, reducing update and maintenance costs. Furthermore, for already sold equipment, the protective mechanism in this embodiment retains the original installation interface, facilitating upgrades and reducing replacement costs. Simultaneously, the detachable design between the wear-resistant structure 3 and the protective stop 2 allows for individual disassembly and replacement without modifying other components, further reducing maintenance costs.

[0026] Optionally, in some embodiments of this application, such as Figure 1 and Figure 3As shown, the wear-resistant structure 3 includes a pair of wear-resistant plates 301, which are correspondingly and detachably connected to a pair of protective stops 2. The wear-resistant plates 301 are located on the side of the protective stops 2 facing the track 9. Optionally, the wear-resistant plates 301 can be made of padding cloth. With this arrangement, the two wear-resistant plates 301 are located on both sides of the track 9. By adding wear-resistant material, the wear-resistant protection function can be fully utilized, effectively reducing wear on the track 9 and extending the service life of the equipment. Moreover, the wear-resistant plates 301 adopt a detachable design, which greatly shortens the downtime of the equipment, improves maintenance efficiency, reduces maintenance costs, and eliminates the need to replace the entire component; only the worn wear-resistant plates 301 need to be replaced, saving materials and costs.

[0027] Optionally, in some embodiments of this application, such as Figure 3 As shown, the wear-resistant plate 301 is provided with at least two first mounting holes 3011 spaced apart along the second direction, such as... Figure 2 As shown, the protective stop 2 is provided with at least two second mounting holes 201 opposite to the first mounting hole 3011. Figure 1 As shown, the protective mechanism also includes at least two first fixing members 4, which are sequentially inserted into the corresponding second mounting holes 201 and first mounting holes 3011. Optionally, the first fixing members 4 can be bolts. During installation, each second mounting hole 201 and each first mounting hole 3011 is aligned, and then the bolts are screwed in to lock the wear-resistant plate 301 to the protective stop 2. It should be noted that the number of second mounting holes 201 and first mounting holes 3011 can be determined according to the actual design requirements, for example, such as... Figure 1 As shown, there are four second mounting holes 201 and four first mounting holes 3011, and correspondingly, there are also four first fasteners 4. Furthermore, the first mounting holes 3011 on the wear-resistant plate 301 can be threaded holes that mate with bolts, thereby simplifying the installation process and improving installation efficiency. In other embodiments, the first fasteners 4 can also be pins, dowels, etc. This arrangement, with multiple fixing points, makes the connection between the wear-resistant plate 301 and the protective stop 2 more robust and reliable, ensuring that the wear-resistant plate 301 is always stably fixed on the protective stop 2, continuously providing wear-resistant protection. The installation method is simple, the operation is convenient, and the assembly efficiency is improved.

[0028] Optionally, in some embodiments of this application, please also refer to Figures 1 to 3 As shown, the wear-resistant plate 301 and / or the protective stop 2 are configured with an arc-shaped surface 7 on the side facing the track plate 10. With this configuration, the bottom of the wear-resistant plate 301 and the protective stop 2 are designed with an arc surface, and their two ends are raised at a certain angle, which can avoid the raised track plate 10 and prevent interference with the raised track plate 10 during movement, thereby reducing wear on the track plate 10.

[0029] Optionally, in some embodiments of this application, such as Figure 1 As shown, the protective mechanism also includes at least two pads 5, each pad 5 corresponding to a pair of protective stops 2, and the pads 5 are detachably connected between the protective stops 2 and the guard plate bracket 1. It is understood that, as Figure 1 As shown, at both ends of the guard plate bracket 1 along the first direction, a pad 5 is provided between the protective stop 2 and the guard plate bracket 1. Furthermore, the protective stop 2, the pad 5, and the guard plate bracket 1 are all detachable. This arrangement allows for flexible adjustment of the gap between the protective stop 2 and the track 9 by adding the pad 5. This adapts to installation scenarios with different assembly gaps and accommodates the assembly requirements of different specifications of track 9, significantly improving the product's adaptability and versatility. The detachable design also facilitates installation and disassembly, enhancing assembly convenience.

[0030] Optionally, in some embodiments of this application, such as Figure 1 and Figure 4 As shown, the guard plate bracket 1 includes a pair of first connecting plates 101, a pair of second connecting plates 102, and two pairs of third connecting plates 103. Specifically, the pair of first connecting plates 101 extend along a first direction, and the pair of first connecting plates 101 are spaced apart along a second direction. The first connecting plates 101 are used to connect with the track frame 8. It should be noted that in this embodiment, the second direction is perpendicular to the first direction, and the second direction is the length direction of the track 9. The pair of second connecting plates 102 are correspondingly arranged with the pair of first connecting plates 101, and the second connecting plates 102 are located on the side of the first connecting plates 101 facing the track 9. That is, as shown... Figure 1 As shown, the upper surface of the first connecting plate 101 is connected to the track frame 8, and the lower surface of the first connecting plate 101 is connected to the second connecting plate 102. Two pairs of third connecting plates 103 are correspondingly arranged with one pair of second connecting plates 102. The pair of third connecting plates 103 are respectively arranged on both sides of the second connecting plate 102 along a first direction. The protective baffle 2 is detachably connected to the third connecting plate 103. Specifically, the inner side of the third connecting plate 103 is connected to the end face of the second connecting plate 102, the outer side of the second connecting plate 102 is connected to the protective baffle 2, and the top of the third connecting plate 103 abuts against the first connecting plate 101 to improve the structural stability of the protective plate bracket 1. It can be understood that, as... Figure 4 As shown, the first connecting plate 101, the second connecting plate 102 and a pair of third connecting plates 103 form a connecting bracket. The two connecting brackets are spaced apart along the second direction to form the entire guard plate bracket 1. The support roller 11 can be accommodated between the two bracket structures.

[0031] This configuration, through the splicing of multiple plates to form a rigid frame, significantly improves the structural strength and deformation resistance of the guard plate bracket 1, enabling it to stably withstand the loads and impacts during operation and ensuring the structural stability of the equipment during operation. Furthermore, the protective baffle 2 and the third connecting plate 103 adopt a detachable design, which improves production efficiency and assembly convenience, and also facilitates later replacement and maintenance.

[0032] Optionally, in some embodiments of this application, such as Figure 4 As shown, the second connecting plate 102 is provided with a clearance portion 1021 for avoiding the track track 9. This arrangement provides clearance space for the track track 9, preventing collisions and friction between the track track 9 and the second connecting plate 102 during movement. This ensures that the rotation and movement of the track track 9 in the track system are not hindered, maintaining the smooth operation of the track system, avoiding equipment failure or operational jamming due to interference, reducing component wear, extending the overall service life of the guard plate bracket 1 and the track track 9, and reducing equipment maintenance costs.

[0033] Optionally, in some embodiments of this application, such as Figure 4 As shown, the third connecting plate 103 is provided with a third mounting hole 1031, such as Figure 2 As shown, the protective stop 2 is provided with a fourth mounting hole 202 opposite to the third mounting hole 1031. Figure 1 As shown, the protective mechanism also includes a second fixing member 6, which is sequentially inserted into the corresponding fourth mounting hole 202 and third mounting hole 1031. Optionally, the second fixing member 6 can be a bolt. During installation, the fourth mounting hole 202 and the third mounting hole 1031 are aligned, and then the bolt is screwed in to lock the third connecting plate 103 to the protective stop 2. It should be noted that the number of fourth mounting holes 202 and third mounting holes 1031 can be determined according to the actual design requirements, for example, such as... Figure 1 As shown, there are four fourth mounting holes 202 and four third mounting holes 1031, and correspondingly, there are also four second fasteners 6. Furthermore, the third mounting holes 1031 on the third connecting plate 103 can be threaded holes that mate with bolts, thereby simplifying the installation steps and improving installation efficiency. In other embodiments, the second fasteners 6 can also be pins, dowels, etc. With this configuration, the connection between the third connecting plate 103 and the protective stop 2 can be completed simply by inserting the second fasteners 6, simplifying the operation, greatly shortening the installation time, improving installation efficiency, and facilitating later maintenance and replacement.

[0034] Optionally, in some embodiments of this application, such as Figure 1As shown, the guard plate bracket 1 is provided with a fifth mounting hole 1011 for connecting the track frame 8. Specifically, the fifth mounting hole 1011 is located on the first connecting plate 101, and the fifth mounting hole 1011 can be adapted to the mounting interface position on the original track frame 8 for upgrading. In this way, the connection and fixation between the guard plate bracket 1 and the track frame 8 can be completed by inserting bolts, pins, etc., which is convenient.

[0035] Optionally, the fifth mounting hole 1011 is configured as an oblong hole. This configuration, by providing an oblong hole, allows for adjustment space, which can compensate for machining errors and installation alignment deviations, facilitates the connection between the guard plate bracket 1 and the track frame 8, reduces assembly difficulty, and improves installation efficiency.

[0036] Optionally, in some embodiments of this application, such as Figure 2 As shown, the protective stop 2 is provided with an arc-shaped groove 203 for assembling the support roller 11. This design avoids interference with the support roller 11, ensures reliable operation of the equipment, and also serves to align the installation, improving the assembly efficiency of the protective mechanism.

[0037] According to embodiments of this application, in a second aspect, a chassis assembly is also provided, including a protective mechanism for a lifting equipment drive device as described in the various embodiments above. The derivation process of this beneficial effect is largely similar to the derivation process of the beneficial effect of the protective mechanism for the lifting equipment drive device described above, and therefore will not be repeated here.

[0038] According to an embodiment of this application, in a third aspect, a lifting device is also provided, including the chassis assembly as described in the above embodiments. Optionally, the lifting device may be a crawler crane, etc. The derivation process of this beneficial effect is roughly similar to the derivation process of the beneficial effect of the chassis assembly described above, and therefore will not be repeated here.

[0039] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A protective mechanism for a lifting equipment drive device, characterized in that, include: A protective plate bracket (1) is used to connect to the track frame (8); A pair of protective stops (2) are respectively disposed on both sides of the guard plate bracket (1) along the first direction. The protective stops (2) are used to prevent the track (9) from derailing, and the protective stops (2) are detachably connected to the guard plate bracket (1). A wear-resistant structure (3) is detachably disposed on the side of the pair of protective stops (2) facing the track (9), the wear-resistant structure (3) being used to reduce wear between the protective stops (2) and the track (9).

2. The protective mechanism for a lifting equipment drive device according to claim 1, characterized in that, The wear-resistant structure (3) includes: A pair of wear-resistant plates (301) are provided and detachably connected to a pair of protective stops (2), the wear-resistant plates (301) being located on the side of the protective stops (2) facing the track (9).

3. The protective mechanism for a lifting equipment drive device according to claim 2, characterized in that, The wear-resistant plate (301) is provided with at least two first mounting holes (3011) spaced apart along the second direction, and the protective stop (2) is provided with at least two second mounting holes (201) opposite to the first mounting holes (3011); the protective mechanism also includes at least two first fixing members (4), which are sequentially inserted into the opposite second mounting holes (201) and first mounting holes (3011); And / or, the wear-resistant plate (301) and / or the protective stop (2) are provided with an arc-shaped surface (7) on the side facing the track plate (10).

4. The protective mechanism for a lifting equipment drive device according to any one of claims 1 to 3, characterized in that, Also includes: At least two pads (5), each of the pads (5) is respectively provided corresponding to a pair of protective stops (2), and the pads (5) are detachably connected between the protective stops (2) and the guard plate bracket (1).

5. The protective mechanism for a lifting equipment drive device according to any one of claims 1 to 3, characterized in that, The guard plate bracket (1) includes: A pair of first connecting plates (101) extend along the first direction and are spaced apart along the second direction, the first connecting plates (101) being used to connect with the track frame (8); A pair of second connecting plates (102) are provided corresponding to a pair of first connecting plates (101), and the second connecting plates (102) are located on the side of the first connecting plates (101) facing the track (9); Two pairs of third connecting plates (103) are provided corresponding to a pair of second connecting plates (102). The pair of third connecting plates (103) are respectively provided on both sides of the second connecting plate (102) along the first direction. The protective baffle (2) is detachably connected to the third connecting plate (103).

6. The protective mechanism for a lifting equipment drive device according to claim 5, characterized in that, The second connecting plate (102) is provided with a clearance part (1021) for avoiding the track (9).

7. The protective mechanism for a lifting equipment drive device according to claim 5, characterized in that, The third connecting plate (103) is provided with a third mounting hole (1031), and the protective stop (2) is provided with a fourth mounting hole (202) opposite to the third mounting hole (1031). The protective mechanism also includes a second fixing member (6), which is inserted into the corresponding fourth mounting hole (202) and third mounting hole (1031) in sequence.

8. The protective mechanism for a lifting equipment drive device according to any one of claims 1 to 3, characterized in that, The guard plate bracket (1) is provided with a fifth mounting hole (1011) for connecting the track frame (8). And / or, the fifth mounting hole (1011) is configured as an oblong hole; And / or, the protective stop (2) is provided with an arcuate groove (203) for mounting the support roller (11).

9. A chassis assembly, characterized in that, Includes a protective mechanism for a lifting equipment drive unit as described in any one of claims 1 to 8.

10. A lifting device, characterized in that, Includes the chassis assembly as described in claim 9.

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