CN216430813U - Transition joint structure, pipeline assembly, telescopic supporting leg assembly and operation machine - Google Patents

Abstract

The embodiment of the utility model provides a transition joint structure, a pipeline assembly, a telescopic supporting leg assembly and an operating machine. The transition joint structure includes: a buffer seat, a spherical transition head and a pipe joint. A through spherical cavity is formed in the buffer seat, the spherical transition head is installed in the spherical cavity in a matching mode, and the spherical transition head can rotate in the spherical cavity in multiple degrees of freedom. A fluid channel penetrating through the spherical transition head is formed in the spherical transition head, and pipe joints are installed at two ports of the fluid channel. This transition joint can adapt to buckling and rocking of connecting tube, can effectively prevent that the pipeline from receiving the wearing and tearing of transition joint design. The looseness of the pipe joint and the spherical transition head can be effectively prevented, and the connection tightness of the pipeline and the transition joint structure is ensured. In addition, the transition joint can effectively absorb and slow down the pressure impact of fluid, effectively protects the transition joint structure and prolongs the service life of the transition joint structure.

Description

Transition joint structure, pipeline assembly, telescopic supporting leg assembly and operation machine

Technical Field

The utility model relates to the technical field of pipeline joints, in particular to a transition joint structure, a pipeline assembly, a telescopic supporting leg assembly and an operation machine.

Background

The support leg of the concrete pump truck comprises a boom and two booms, wherein the two booms are coaxially arranged in the boom. Simultaneously, still install a set of double-barreled pipe in the landing leg, along with the flexible of landing leg, the double-barreled pipe also can buckle and stretch out and draw back. As shown in fig. 1, the ends of the duplex hose are typically connected to the primary hose system using a straight-through bulkhead fitting. Because the straight-through partition plate joint is of a fixed rigid structure, the straight-through partition plate joint often abrades the duplex rubber pipe when the duplex rubber pipe is bent and stretched. After the support legs reciprocate for a period of time, the buckling head of the duplex rubber pipe and the joint of the straight-through partition plate can be loosened. In addition, because the straight-through partition plate joint is a fixed rigid structure, the impact effect of long-term fluid pressure is small, and the joint can be damaged.

SUMMERY OF THE UTILITY MODEL

The utility model provides a transition joint structure, a pipeline assembly, a telescopic supporting leg assembly and an operation machine, which are used for solving the problems that a pipeline connecting joint in the prior art is easy to abrade a pipeline, the pipeline and the pipeline joint are easy to loosen and the pipeline joint is easy to damage due to fluid impact, so that the pipeline is protected from being abraded by the pipeline joint, the connection tightness of the pipeline and the pipeline joint is ensured, and meanwhile, the effect that the pipeline joint is impacted by fluid pressure can be buffered.

According to a first aspect of the present invention, there is provided a transitional coupling structure comprising: a buffer seat, a spherical transition head and a pipe joint.

Wherein, a through spherical cavity is formed in the buffer seat. The spherical transition head is installed in the spherical cavity in a matching mode. And the spherical transition head can rotate in the spherical cavity with multiple degrees of freedom.

The spherical transition head is internally provided with a fluid channel penetrating through the spherical transition head, and the two ports of the fluid channel are both provided with the pipe joints.

According to the transitional joint structure provided by the utility model, the buffer seat comprises a first buffer seat and a second buffer seat. The first buffer seat is connected with the second buffer seat, and the first buffer seat and the second buffer seat can form a spherical cavity matched with the spherical transition head, so that the spherical transition head can rotate in the spherical cavity.

According to the transitional joint structure provided by the utility model, the first buffer seat and the second buffer seat are configured into a split structure, and the first buffer seat and the second buffer seat are detachably connected.

According to the transitional joint structure provided by the utility model, the two ends of the first buffer seat are both formed with the first connecting lugs. And second connecting lugs matched with the first connecting lugs are formed at two ends of the second buffer seat.

And each first connecting lug is provided with a first through hole, each second connecting lug is provided with a second through hole matched with the first through hole, and fastening bolts are arranged in the corresponding first through hole and the second through hole.

According to the transition joint structure provided by the utility model, a sliding sleeve is arranged between the buffer seat and the spherical transition head.

According to the transitional joint structure provided by the utility model, the lower end of the buffer seat is provided with the fixed connecting rod for fixing the transitional joint structure.

According to the transitional joint structure provided by the utility model, the two ports of the fluid channel are in threaded connection with the pipe joint. Or the two ports of the fluid channel are connected with the pipe joint through flanges.

According to a second aspect of the present invention, there is provided a pipeline assembly comprising a first pipeline, a second pipeline and a transitional joint structure as described above.

Wherein the first pipeline is installed on the pipe joint at one end of the fluid passage, and the second pipeline is installed on the pipe joint at the other end of the fluid passage.

According to a third aspect of the present invention, there is provided a telescopic leg assembly comprising a turntable on which a box is formed and a leg boom mounted in and telescopically movable in the box.

The telescopic leg assembly further comprises a pipe assembly as described above, wherein the transitional joint structure is mounted in the leg boom, the first pipe is at least partially located in the box, the second pipe is at least partially located in the leg boom, and the second pipe is movable with the leg boom.

According to a fourth aspect of the present invention, there is also provided a work machine comprising a pipe assembly as described above or a telescopic leg assembly as described above.

In the transitional joint structure provided by the utility model, a through spherical cavity is formed in the buffer seat. The spherical transition head is installed in the spherical cavity in a matching mode, and the spherical transition head can rotate in the spherical cavity in multiple degrees of freedom. And a fluid channel penetrating through the spherical transition head is formed in the spherical transition head, and the pipe joints are installed at two ports of the fluid channel.

Compared with the prior art, in the transition joint structure, a through spherical cavity is formed in the buffer seat, and the spherical transition head is installed in the spherical cavity of the buffer seat in a matching manner. Furthermore, the spherical transition head can rotate freely in the spherical cavity of the buffer seat. Therefore, the pipe joints installed at both ends of the fluid passage of the spherical transition head can rotate with multiple degrees of freedom. Furthermore, the transition joint can adapt to bending, shaking and the like of the connecting pipeline, and can effectively prevent the pipeline from being worn by the transition joint structure. Meanwhile, the transition joint structure can rotate at multiple degrees of freedom, so that the pipe joint and the spherical transition head can be effectively prevented from loosening, and the connection tightness of the pipeline and the transition joint structure is ensured. In addition, because the pipe joint can rotate with multiple degrees of freedom, the transition joint can effectively absorb and slow down the pressure impact of fluid, thereby effectively protecting the transition joint structure and prolonging the service life of the transition joint structure.

In the pipe assembly provided by the utility model, the pipe assembly also has the advantages as described above because the pipe assembly comprises the transitional joint structure as described above.

Further, in the telescopic leg assembly provided by the utility model, since the telescopic leg assembly comprises the pipeline assembly, the telescopic leg assembly also has the advantages as described above.

Similarly, in the working machine provided by the utility model, since the working machine comprises the pipeline assembly or the telescopic leg assembly, the advantages are also provided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a first perspective view of a transition joint structure according to the present invention;

FIG. 2 is a schematic perspective view of a second transitional joint structure according to the present invention;

FIG. 3 is a schematic cross-sectional view of a transition joint structure provided by the present invention;

reference numerals:

100: a buffer seat; 101: a first buffer seat; 102: a second buffer seat;

200: a spherical transition head; 300: a pipe joint; 401: a first connecting lug;

402: a second engaging lug; 403: fastening a bolt; 500: a sliding sleeve;

600: and fixing the connecting rod.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In embodiments of the utility model, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification to make the purpose, technical solution, and advantages of the embodiments of the present invention more clear, and the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are a part of embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A transitional joint structure, a pipeline assembly, a telescopic leg assembly and a working machine according to embodiments of the present invention will be described with reference to fig. 1 to 3. It should be understood that the following description is only exemplary embodiments of the present invention and does not constitute any particular limitation of the present invention.

Embodiments of the first aspect of the present invention provide a transitional coupling structure, as shown in fig. 1 to 3, including: a cushion socket 100, a spherical transition piece 200, and a pipe joint 300.

Wherein, a through spherical cavity is formed in the buffer seat 100, and the spherical transition head 200 is installed in the spherical cavity in a matching way. And, the spherical transition head 200 is capable of multiple degrees of freedom of rotation within the spherical cavity. Here, as shown in fig. 2, taking an end surface of the spherical transition head 200 facing the user in the schematic diagram of fig. 2 (i.e., the end surface indicated by reference numeral 200) as an X-Y plane, and taking a central axis of the through spherical cavity as a Z axis (i.e., a central axis of the fluid channel), the multi-degree-of-freedom rotation means that the multi-degree-of-freedom rotation can rotate at least in two planes of the X-Y plane, the X-Z plane, and the Y-Z plane. In this embodiment, the ball-type transition head 200 can rotate in three planes. A fluid passage is formed through the spherical transition head 200 in the spherical transition head 200. Pipe joints 300 are installed at both ends of the fluid passage.

As shown in fig. 1, the spherical cavity has openings at both ends, and the openings at both ends are communicated with each other. The spherical transition head 200 is fittingly installed in the spherical cavity and can rotate in any degree of freedom in the spherical cavity.

In the working process, the spherical transition head 200 is installed in the spherical cavity in the buffer seat 100 in a clearance fit manner, and the pipe joints 300 at both ends of the fluid passage are connected with pipelines. When the pipeline bends or shakes, since the spherical transition head 200 can rotate in the spherical cavity in the buffer seat 100, the pipe joint 300 can be adaptively adjusted in the direction along with the swing of the pipeline.

Compared with the prior art, in the above transitional joint structure, a spherical cavity is formed in the buffer seat 100, and the spherical transitional head 200 is fittingly installed in the spherical cavity of the buffer seat 100. Further, the spherical transition head 200 can freely rotate within the spherical cavity of the cushion socket 100. Thereby, the pipe joint 300 installed at both ends of the fluid passage of the spherical transition head 200 can be rotated in multiple degrees of freedom. Furthermore, this transitional joint structure can adapt to connecting line's buckle and rock etc. can effectively prevent that the pipeline from receiving the wearing and tearing of transitional joint structure. Meanwhile, the transition joint structure can rotate at multiple degrees of freedom, so that the pipe joint 300 and the spherical transition head 200 can be effectively prevented from loosening, and the connection tightness of the pipeline and the transition joint structure is ensured. In addition, because the pipe joint 300 can rotate with multiple degrees of freedom, the transition joint structure can effectively absorb and slow down the pressure impact of fluid, thereby effectively protecting the transition joint structure and prolonging the service life of the transition joint structure.

In one embodiment of the present invention, the cushion seat 100 includes a first cushion seat 101 and a second cushion seat 102. The first buffer base 101 is connected to the second buffer base 102. And, the first buffer seat 101 and the second buffer seat 102 can form a spherical cavity matched with the spherical transition head 200, so that the spherical transition head 200 can rotate in the spherical cavity.

Specifically, as shown in fig. 2 and 3, the transitional coupling structure includes: a first cushion seat 101, a second cushion seat 102, a spherical transition head 200, and a pipe joint 300.

Wherein, the first buffer seat 101 is connected with the second buffer seat 102 in a butt joint manner. And, the first buffer seat 101 and the second buffer seat 102 are connected in a butt joint manner to form a spherical cavity matched with the spherical transition head 200. The spherical transition head 200 is installed in the spherical cavity, and the spherical transition head 200 can rotate in multiple degrees of freedom in the spherical cavity.

Wherein a fluid passage is formed through the spherical transition head 200 in the spherical transition head 200. At both end ports of the fluid passage, pipe joints 300 are installed.

It should be noted here that the present invention is not limited in any way as to the connection manner between the first cushion seat 101 and the second cushion seat 102.

For example, in one embodiment of the present invention, the first cushion seat 101 and the second cushion seat 102 are configured as an integrally formed structure. For example, the first buffer seat 101 and the second buffer seat 102 may be cast as an integrally formed structure.

For another example, in one embodiment of the present invention, as shown in fig. 2, the first buffer seat 101 and the second buffer seat 102 are configured as a split structure, and the first buffer seat 101 and the second buffer seat 102 are detachably connected.

Specifically, the transitional joint structure includes: a first cushion seat 101, a second cushion seat 102, a spherical transition head 200, and a pipe joint 300.

The first buffer seat 101 and the second buffer seat 102 are of a split structure, and the first buffer seat 101 is detachably connected below the second buffer seat 102 in a butt joint manner. The first buffer seat 101 and the second buffer seat 102 are connected in a butt joint manner to form a spherical cavity matched with the spherical transition head 200. The spherical transition head 200 is installed in the spherical cavity, and the spherical transition head 200 can rotate in multiple degrees of freedom in the spherical cavity.

Wherein a fluid passage is formed through the spherical transition head 200 in the spherical transition head 200. At both end ports of the fluid passage, pipe joints 300 are installed.

It should be noted here that the present invention is not limited in any way as to the detachable connection manner between the first buffer base 101 and the second buffer base 102.

For example, in one embodiment of the present invention, as shown in fig. 2, both ends of the first cushion seat 101 are formed with first coupling lugs 401. Both ends of the second cushion seat 102 are formed with second coupling lugs 402 that are matched with the first coupling lugs 401.

Wherein, each first connecting lug 401 is formed with a first through hole. Each second engaging lug 402 has a second through hole matching the first through hole. Fastening bolts 403 are installed in the corresponding first and second through holes.

Specifically, as shown in fig. 2 and 3, the transitional coupling structure includes: a first cushion seat 101, a second cushion seat 102, a spherical transition head 200, and a pipe joint 300.

The first buffer seat 101 and the second buffer seat 102 are separated. First coupling lugs 401 are formed at both sides of the first cushion seat 101. The second cushion seat 102 is formed with second engaging lugs 402 on both sides thereof. The first engaging lug 401 and the second engaging lug 402 can be fitted and mounted in a butt joint. A first through hole is formed in the first engaging lug 401, and a second through hole is correspondingly formed in the second engaging lug 402. That is, when the first cushion seat 101 and the second cushion seat 102 are installed in a butt joint manner, the first engaging lugs 401 on both sides of the first cushion seat 101 and the second engaging lugs 402 on both sides of the second cushion seat 102 are in corresponding contact with each other. And the first through hole and the second through hole are corresponding to each other and are matched with each other. Fastening bolts 403 are installed in the first and second through holes to fasten the first cushion seat 101 and the second cushion seat 102.

And, after the first buffer seat 101 and the second buffer seat 102 are connected in a butt joint manner, a spherical cavity matched with the spherical transition head 200 can be formed. The spherical transition head 200 is installed within the spherical cavity. The spherical transition head 200 is capable of multiple degrees of freedom rotation within the spherical cavity.

Wherein a fluid passage is formed through the spherical transition head 200 in the spherical transition head 200. At both end ports of the fluid passage, pipe joints 300 are installed.

According to the embodiment described above, by using the fastening bolt 403 to connect the first buffer seat 101 and the second buffer seat 102 in a butt joint manner, the worker can detach the first buffer seat 101 and the second buffer seat 102 more conveniently when performing maintenance and repair of the transitional joint structure, and the maintenance and repair efficiency is greatly improved.

Further, in one embodiment of the present invention, as shown in fig. 2 and 3, a sliding sleeve 500 is installed between the buffer seat 100 and the spherical transition head 200.

For example, the sliding sleeve 500 is a wear-resistant concentric ball type sliding sleeve having two half bowl shapes. Two half bowl-shaped concentric spherical sliding sleeves are butt-jointed and installed between the spherical transition head 200 and the buffer seat 100.

The sliding sleeve 500 is arranged between the buffer seat 100 and the spherical transition head 200, so that the spherical transition head 200 can smoothly rotate in the sliding sleeve 500, dry friction between the spherical transition head 200 and the buffer seat 100 can be effectively avoided, the transition joint structure is effectively protected, and the service life of the transition joint structure is prolonged.

In one embodiment of the present invention, the lower end of the cushion housing 100 is formed with a fixing link 600 for fixing the transitional joint structure.

For example, as shown in fig. 1 to 3, the fixed link 600 is disposed below the first cushion seat 101.

Through setting up fixed link 600 at the buffing pad 100 lower extreme, can fix the transition joint design inside the landing leg of mobile concrete pump, perhaps other required places, and then can guarantee the stability of transition joint work.

It should be noted here that the above-described embodiment is only one exemplary embodiment of the present invention. That is to say, the structure and the setting position of fixed connecting rod 600, the staff can adjust by oneself according to actual need. For example, the fixed connection bar 600 may be replaced with a connection plate or the like. The connection plate may also be mounted at other desired locations.

It should also be noted here that the present invention is not limited in any way as to the manner of connection between the pipe joint 300 and the spherical transition head 200 at both ends of the fluid passage.

For example, as shown in FIG. 1, in one embodiment of the utility model, both ends of the fluid passage are threadedly connected to a pipe joint 300.

For another example, as shown in FIG. 2, in one embodiment of the present invention, both ends of the fluid channel are connected to the pipe joint 300 by flanges.

The above-described embodiments are only two illustrative embodiments of the present invention and do not limit the present invention in any way. In other words, the connection between the pipe joint 300 and the spherical transition head 200 at both ends of the fluid passage includes, but is not limited to, a threaded connection and a flanged connection.

Embodiments of the second aspect of the utility model provide a pipeline assembly comprising: a first pipeline, a second pipeline, and a transitional joint structure as described above.

Wherein the first line is mounted on the pipe joint 300 at one end of the fluid passage. The second line is mounted on the pipe joint 300 at the other end of the fluid passage.

For example, the pipe joints 300 on both sides of the fluid passageway of the transitional joint structure are a first pipe joint and a second pipe joint, respectively. The first pipeline is installed on the first pipe joint, and the second pipeline is installed on the second pipe joint. Along with the bending and shaking of the first pipeline and the second pipeline, the first pipe joint and the second pipe joint can perform multi-degree-of-freedom adaptive rotation.

Therefore, the first pipeline and the second pipeline can be effectively protected. Meanwhile, the loosening phenomenon caused by shaking between the first pipeline and the first pipe joint and between the second pipeline and the second pipe joint can be reduced. In addition, because the pipeline assembly comprises the transitional joint structure, the pipeline assembly has the function of buffering fluid impact.

Embodiments of a third aspect of the utility model provide a telescopic leg assembly comprising a turntable and a leg boom. The turntable is provided with a box body. The outrigger arm is installed in the box and can stretch out and draw back in the box.

The telescopic leg assembly further comprises a conduit assembly as described above. Wherein the transitional joint structure is arranged in the outrigger arm. The first conduit is at least partially located in the tank. The second pipeline is at least partially positioned in the support leg arm. And the second pipeline can move along with the outrigger arm.

Further, embodiments of a fourth aspect of the present disclosure provide a work machine including a pipe assembly as described above or a telescoping leg assembly as described above.

For example, in one embodiment of the present invention, the work machine comprises a fire truck, a pump truck, a crane, or an aerial lift truck.

It should be noted that the above-mentioned embodiment is only an illustrative embodiment of the present invention, and does not constitute any limitation to the present invention. In other words, the work machine includes, but is not limited to, a fire truck, a pump truck, a crane, or an aerial work vehicle. All work machines incorporating the above-described plumbing assembly or telescoping leg assembly are intended to be within the scope of the present disclosure.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A transitional coupling structure, comprising: a buffer seat, a spherical transition head and a pipe joint,

wherein a through spherical cavity is formed in the buffer seat, the spherical transition head is arranged in the spherical cavity in a matching way, and the spherical transition head can rotate in the spherical cavity with multiple degrees of freedom,

the spherical transition head is internally provided with a fluid channel penetrating through the spherical transition head, and the two ports of the fluid channel are both provided with the pipe joints.

2. The transition joint structure of claim 1, wherein the buffer seat comprises a first buffer seat and a second buffer seat, the first buffer seat is connected to the second buffer seat, and the first buffer seat and the second buffer seat can form a spherical cavity adapted to the spherical transition head, so that the spherical transition head can rotate in the spherical cavity.

3. The transitional joint structure of claim 2, wherein the first and second damping seats are configured as a single-piece structure, and the first and second damping seats are detachably connected.

4. The transitional joint structure of claim 3, wherein the first cushion seat has first connecting lugs formed at both ends thereof, the second cushion seat has second connecting lugs formed at both ends thereof for matching with the first connecting lugs,

and each first connecting lug is provided with a first through hole, each second connecting lug is provided with a second through hole matched with the first through hole, and fastening bolts are arranged in the corresponding first through hole and the second through hole.

5. The transition joint structure of claim 1, wherein a sliding sleeve is mounted between the bump stop and the ball transition head.

6. The transitional joint structure of claim 1, wherein the lower end of the cushion socket is formed with a fixing connecting rod for fixing the transitional joint structure.

7. The transition joint structure of any one of claims 1 to 6, wherein both ports of the fluid passage are threadedly connected to the pipe joints, or both ports of the fluid passage are flanged to the pipe joints.

8. A manifold assembly, comprising: first and second conduits and a transition joint structure according to any one of claims 1 to 7,

wherein the first pipeline is installed on the pipe joint at one end of the fluid passage, and the second pipeline is installed on the pipe joint at the other end of the fluid passage.

9. A telescopic leg component is characterized by comprising a rotary table and a leg extension arm, wherein a box body is formed on the rotary table, the leg extension arm is installed in the box body and can be stretched in the box body,

the telescoping leg assembly further comprising the pipe assembly of claim 8, wherein the transition joint structure is mounted in the leg boom, the first pipe is at least partially located in the tank, the second pipe is at least partially located in the leg boom, and the second pipe is movable with the leg boom.

10. A work machine comprising a pipe assembly according to claim 8 or a telescopic leg assembly according to claim 9.

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