Decorative trees and tree stand thereof

This application claims priority to Chinese Patent Application No. 202410178370.8, entitled “DECORATIVE TREE AND TREE STAND THEREOF” filed on Feb. 8, 2024, which are incorporated herein in their entirety by reference.

The present application relates to the technical field of decorations, and in particular, to a decorative tree and a tree stand thereof.

With the improvement of living standards, people are beginning to focus on the comfort and aesthetics in the working and living environment, decorations such as artificial decorative trees (e.g., Christmas trees, decorative lighted trees, etc.) and the like are placed in many places to create an atmosphere, and are indispensable especially in various festivals. The common decorative lighted tree, as an example, usually consists of a light mesh and a tree stand. The light mesh is woven from light strings and cords, and then hanged or wrapped on the tree stand for use. In order to enhance the decorative effect of the decorative tree, the overall volume of the decorative tree is usually large. This leads to problems such as taking up a large amount of space during transportation and storage. In order to solve these problems, decorative lighted trees are usually designed as foldable structures in the industry. However, the unfolding and folding process of the current common decorative light trees is cumbersome.

According to various embodiments, a decorative tree and a tree stand thereof are provided.

A tree stand is provided. The tree stand includes: a pole assembly; support arms connected to a bottom end of the pole assembly and configured to be connected to a bottom of a decorative mesh; a first mounting member mounted on a top end of the pole assembly and including a locking portion; and a second mounting member movably disposed on the pole assembly. The first mounting member is configured to be connected to a top of the decorative mesh. The second mounting member includes an engaging portion which can be engaged with the locking portion to limit a movement of the second mounting member relative to the pole assembly.

The support arms are disposed at the bottom end of the pole assembly and connected to the bottom of the decorative mesh and the second mounting member is movably disposed on the pole assembly and connected to the top of the decorative mesh, so that a state of the decorative mesh can be changed by changing a position of the second mounting member, allowing the decorative mesh to be switched between an expanded state and a collapsed state. The first mounting member is mounted at the top end of the pole assembly and includes the locking portion, and the second mounting member includes the engaging portion capable of being locked with the locking portion, therefore, when the second mounting member is moved to the top end of the pole assembly, the user can interlock the locking portion with the engaging portion by operation, to fix the second mounting member, and thus the decorative mesh is maintained in the expanded state to play a good decorative role. Accordingly, the user can operate the first mounting member or the second mounting member to unlock the locking portion from the engaging portion, thereby separating the second mounting member from the first mounting member. When the second mounting member is separated from the first mounting member, the second mounting member automatically moves to the bottom end of the pole assembly under gravity, to switch the decorative mesh to the collapsed state, and thus, the volume of the decorative tree can be reduced. In other words, when it is required to unfold the decorative tree to achieve the decorative roll, the user may quickly pull the second mounting member to move to the top end, and then interlock the locking portion with the engaging portion by operation, and when it is required to reduce the volume of the decorative tree for storage or transportation, the user may unlock the locking portion from the engaging portion by operation. As such, the above tree stand is beneficial to simplify the steps of unfolding and folding the decorative tree and improve the efficiency of unfolding and folding the decorative tree.

In an embodiment, one of the locking portion and the engaging portion is a limiting protrusion, and another of the locking portion and the engaging portion is a limiting groove. The limiting groove is curved, and two ends of the limiting groove form a starting end and a locking end respectively. The second mounting member is movably sleeved on the pole assembly, and the first mounting member is rotatable relative to the second mounting member to enable the limiting protrusion to reciprocate between the starting end and the locking end. The first mounting member is fixed relative to the second mounting member when the limiting protrusion is engaged at the locking end.

In an embodiment, the starting end extends through an end face of the second mounting member facing the first mounting member. A sidewall of the limiting groove is provided with an engaging protrusion. The engaging protrusion is located at the locking end and configured to abut against the limiting protrusion to limit the limiting protrusion to the locking end.

In an embodiment, the second mounting member includes a locking sleeve and a connecting base connected to each other. The engaging portion is disposed on the locking sleeve, and the connecting base includes a connecting portion configured to be connected to the top of the decorative mesh.

In an embodiment, the engaging portion is a limiting groove. The limiting groove at least extends through an outer side surface of the locking sleeve. The locking portion is a limiting protrusion. A side of the first mounting member facing the second mounting member is provided with a rotation hole. The limiting protrusion is disposed on an inner wall of the rotation hole. At least a portion of the locking sleeve is received in the rotation hole and is connected to the first mounting member by a cooperation between the limiting protrusion and the limiting groove.

In an embodiment, the first mounting member is located at the top end of the pole assembly and is movable in a length direction of the pole assembly relative to the pole assembly.

In an embodiment, the top end of the pole assembly is provided with a support cylinder. The support cylinder is provided with a coupling hole in communication with an inner cavity of the support cylinder. The first mounting member is provided with a guide post. The guide post extends through the coupling hole and is at least partially limited in the inner cavity of the support cylinder.

In an embodiment, the inner cavity of the support cylinder is provided with a stop block. The stop block is detachably connected to the guide post, and stopped by a bottom wall of the inner cavity of the support cylinder to limit at least a part of the first mounting member in the support cylinder.

In an embodiment, the tree stand further includes an elastic member disposed between the first mounting member and the pole assembly. The elastic member is configured to provide elastic force that enables the first mounting member to move away from the bottom end of the pole assembly.

In an embodiment, a side of the first mounting member facing the second mounting member is provided with a rotation hole. A bottom wall of the rotation hole is provided with a guide post. The top end of the pole assembly is provided with a support cylinder having a coupling hole. The guide post is movably inserted into the coupling hole, and the elastic member is sleeved on the guide post. Two ends of the elastic member are located between the coupling hole and the bottom wall of the rotation hole, and abuts against the support cylinder and the bottom wall of the rotating hole respectively.

In an embodiment, the pole assembly includes a fixed support tube assembly connected to the support arms and a movable support tube assembly connected to the first mounting member. The movable support tube assembly is detachably connected to the fixed support tube assembly. Or the movable support tube assembly is telescopically connected to the fixed support tube assembly.

In an embodiment, at least one of the fixed support tube assembly and the movable support tube assembly includes at least two support tubes. The at least two support tubes are detachably connected or telescopically connected.

In an embodiment, the tree stand further includes a support base fixed to the pole assembly. An end of each support arm is hinged to the support base to allow the support arm to switch between an unfolded state and a folded state, another end of each support arm is configured to be connected to the decorative mesh.

In an embodiment, the tree stand further includes: a movable base movably disposed on the pole assembly and connected to the support arms to drive the support arms to switch between the unfolded state and the folded state; and a first locking mechanism disposed on the movable base and having a locked state and an unlocked state. When the first locking mechanism is in the locked state, the movable base is limited from moving relative to the pole assembly to keep the support arms in the unfolded state or the folded state, and when the first locking mechanism is in the unlocked state, the movable base is allowed to move relative to the pole assembly to allow the support arms to switch between the unfolded state and the folded state.

In an embodiment, the pole assembly is provided with at least one locking recess, and the first locking mechanism includes a locking member disposed on the movable base and movable in a first direction. When the first locking mechanism is in the locked state, the locking member extends into one of the at least one locking recess to limit the movable base from moving relative to the pole assembly, and when the first locking mechanism is in the unlocked state, the locking member withdraws from the one of the at least one locking recess to allow the movable base to move relative to the pole assembly.

In an embodiment, the first locking mechanism further includes a first reset member abutting against the locking member to bias the locking member to move from an unlocked position to a locked position.

In an embodiment, the movable base includes a through channel and is sleeved on the pole assembly through the through channel. The movable base further includes a receiving cavity and a through hole. The through hole is in communication with the receiving cavity and the through channel. The first reset member is disposed in the receiving cavity. At least a portion of the locking member is movably disposed in the receiving cavity. Two ends of the first reset member abut against an inner wall of the receiving cavity and the locking member respectively, to bias the locking member to move in a direction of extending out of the through hole.

In an embodiment, the movable base includes an upper shell and a lower shell which are connected to each other. The through channel includes a first channel and a second channel. The upper shell includes an inner ring portion with the first channel and an outer peripheral portion surrounding the inner ring portion. The outer peripheral portion is connected to the inner ring portion, the receiving cavity is formed between the outer peripheral portion and the inner ring portion, and the inner ring portion has the through hole. The lower shell has the second channel.

In an embodiment, the tree stand further includes an unlocking mechanism including an unlocking member. The unlocking member is connected to the locking member and operatable to drive the locking member to move from a locked position to an unlocked position. The unlocking member has a first position and a second position. When the unlocking member is in the first position, the locking member is in the locked position, and when the unlocking member is in the second position, the locking member is in the unlocked position.

In an embodiment, the unlocking member is disposed on the movable base and is movable in a second direction. When the unlocking member moves from the first position to the second position, the unlocking member drives the locking member to move from the locked position to the unlocked position in the first direction. The second direction is parallel to a radial direction of the pole assembly and not parallel to the first direction.

In an embodiment, the movable base includes an upper shell and a lower shell which are connected to each other. The upper shell includes an inner ring portion and an outer peripheral portion surrounding the inner ring portion. The outer peripheral portion is connected to the inner ring portion, a receiving cavity is formed between the outer peripheral portion and the inner ring portion. The inner ring portion is provided with a through hole. The unlocking mechanism further includes a guide member arranged in the receiving cavity and has a limiting hole corresponding to the through hole. The locking member is movably inserted into the limiting hole and is at least partially limited in the limiting hole. The outer peripheral portion is provided with an operation hole in communication with the receiving cavity. The unlocking member extends through the operation hole and is movably disposed in the receiving cavity. When the unlocking member moves from the first position to the second position in the second direction, the unlocking member pushes the guide member to move in the first direction to drive the locking member to move from the locked position to the unlocked position.

In an embodiment, the locking member is provided with a limiting boss and extends through the limiting hole. The limiting boss is capable of abutting against an opening edge of the limiting hole to limit at least a part of the locking member in the limiting hole.

In an embodiment, the unlocking member includes an operation button and a push arm. The push arm is movably disposed in the receiving cavity. The operation button extends through the operation hole to be connected to the push arm. When the operation button moves in the second direction, the pushing arm is driven to move in the second direction and cause the push arm to abut against the guide member.

In an embodiment, an end of the push arm away from the operation button has a driving bevel inclined relative to the second direction. The guide member has a guiding portion configured to abut against the driving bevel and be slidable along the driving bevel.

In an embodiment, the unlocking mechanism further includes a second reset member. Two ends of the second reset member abut against the operation button and the inner ring portion respectively to bias the unlocking member to move from the second position to the first position.

In an embodiment, two first locking mechanisms and two guide members are provided. The inner ring portion is provided with two through holes. The unlocking member includes two push arms. The two push arms are movably disposed in the receiving cavity and connected to the operation button. The unlocking member is located between two first locking mechanisms. One of the push arms abuts against one of the guide members, and another of the push arms abuts against another of the guide members. When the operation button moves in the second direction, the two push arms are simultaneously driven to move in the second direction and to abut against the guide members respectively.

In an embodiment, two unlocking mechanisms are provided. The two unlocking mechanisms and the two first locking mechanisms are alternately disposed in the movable base.

In an embodiment, the movable base includes first hinged portions. The tree stand further includes link members. The link members are hinged between the first hinged portions and the support arms respectively to drive the support arms to switch between the unfolded state and the folded state.

In an embodiment, the tree stand further included a bottom support mechanism including a support body and a support foot. An end of the support body is provided with an insertion hole configured to receive the bottom end of the pole assembly. A plurality of the support feet are provided and spaced apart in a circumferential direction of the support body.

A decorative tree is further provided. The decorative tree includes a decorative mesh and the tree stand according to any one of the above embodiments. The top of the decorative mesh is connected to the second mounting member, and the bottom of the decorative mesh is connected to the support arms.

: decorative tree,: tree stand,: pole assembly,: fixed support tube assembly,: first abutting end,: movable support tube assembly,: second butting end,: support tube,: third butting end,: fourth butting end,: elastic wire,: locking recess,: first locking recess,: second locking recess,: support arm,: first mounting member,: locking portion,: limiting protrusion,: rotation hole,: guide post,: second mounting member,: engaging portion,: limiting groove,: starting end,: locking end,: engaging protrusion,: limiting space,: first sidewall,: second sidewall,: locking sleeve,: connecting base,: connecting portion,: elastic member,: support cylinder,: coupling hole,: stop block,: support base,: first base body,: second base body,: second hinged portion,: third base body,: movable base,: connecting body,: first hinged portion,: first slot,: mounting gap,: through channel,: first channel,: second channel,: receiving cavity,: through hole,: upper shell,: inner ring portion,: first avoidance groove,: outer peripheral portion,: limiting post,: operation hole,: plate,: lower shell,: limiting portion,: limiting guide,: first limiting slot,: resisting member,: circular sleeve,: connecting foot,: link member,: first locking mechanism,: locking member,: first reset member,: limiting boss,: unlocking mechanism,: unlocking member,: operation button,: push arm,: driving bevel,: guide member,: limiting hole,: sliding guide groove,: guide portion,: second limiting slot,: second reset member,: bottom support mechanism,: support body,: insertion hole,: support foot,: decorative mesh,: light string,: cord.

In order to make the foregoing objects, features and advantages of the present application more apparent and understandable, a detailed description of the specific embodiments of the present application is set forth below with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the concept of the present application, and therefore the present application is not limited by the specific embodiments disclosed below.

is a perspective view of a decorative treeaccording to an embodiment of the present application. The decorative treemay include a decorative meshand a tree stand. The decorative treewill be detailed described below, as well as the decorative meshand the tree stand.

Referring to, in an embodiment, the decorative treeis illustrated, for example, as a decorative lighted tree. The decorative meshmay, for example, be a flexible woven mesh, so that ornaments (such as small pendants, light beads, etc.) may be hung thereon to provide a good decorative effect. Furthermore, the decorative meshmay, for example, be a light mesh, which is woven from a plurality of light stringsand a plurality of cords. Specifically, when expanded, the decorative meshhas a substantially conical structure, i.e., a space enclosed by the decorative meshgradually decreases in diameter from bottom to top. In other embodiments, when expanded, the decorative meshmay have other structures, such as a cubic structure or a cylindrical structure. In this embodiment, as shown in, the decorative mesh, which has a conical structure when expanded, is illustrated. Specifically, each of the light stringsis substantially circular. Diameters of the circular light stringsdecrease gradually from bottom to top. The circular light stringswith gradually decreasing diameters are connected one by one by means of the respective cords. Moreover, the plurality of cordsmay be spaced apart in a circumferential direction of the light strings. Alternatively, in other embodiments, each of the cordsis substantially in a shape of a circular ring. Diameters of the circular cordsdecreases gradually from bottom to top. The circular cordswith gradually decreasing diameters are connected one by one by means of the respective light strings. Moreover, the plurality of light stringsmay be spaced apart in a circumferential direction of the cords.

Referring to, the tree standincludes a pole assembly, a support arm, a first mounting memberand a second mounting member. The support armis connected to a bottom end of the pole assemblyand configured to be connected to a bottom of the decorative mesh. The first mounting memberis mounted at a top end of the rod assemblyand has a locking portion(see). The second mounting memberis movably disposed on the pole assemblyand configured to be connected to a top of the decorative mesh. The second mounting memberhas an engaging portion(see). The engaging portionis capable of being locked with the locking portionto limit movement of the second mounting memberrelative to the pole assembly.

The support armis disposed at the bottom end of the pole assemblyand connected to the bottom of the decorative mesh, and the second mounting memberis movably disposed on the pole assemblyand connected to the top of the decorative mesh, so that a state of the decorative meshcan be changed by changing a position of the second mounting member, allowing the decorative meshto be switched between an expanded state and a collapsed state. The first mounting memberis mounted at the top end of the pole assemblyand has the locking portion, and the second mounting memberhas the engaging portionwhich is capable of being locked with the locking portion, so that when the second mounting memberis moved to the top end of the pole assembly, the user can interlock the locking portionwith the engaging portionby operation, so as to fix the second mounting member, and therefore, the decorative meshis maintained in the expanded state to play a good decorative role. Accordingly, the user can operate the first mounting memberor the second mounting memberto unlock the locking portionfrom the engaging portion, thereby separating the second mounting memberfrom the first mounting member. When the second mounting memberis separated from the first mounting member, the second mounting memberautomatically moves to the bottom end of the pole assemblyunder pushing force or gravity, so as to bring the decorative meshinto the collapsed state, and thus, volume of the decorative treecan be reduced. In other words, when it is required to unfold the decorative treefor decorative effect, the user may quickly pull the second mounting memberto move to the top end, and then interlock the locking portionwith the engaging portionby operation. When it is required to reduce the volume of the decorative treefor storage or transportation, the user may unlock the locking portionfrom the engaging portionby operation. It can be seen that the above tree standcan simplify the folding process of the decorative treeand improves folding efficiency.

Configurations of the pole assembly, the first mounting memberand the second mounting memberwill be described below, one by one, in conjunction with the drawings.

Referring to, in an embodiment, the pole assemblygenerally includes a fixed support tube assemblyand a movable support tube assembly. The support armis connected to the fixed support tube assembly. The movable support tube assemblyis detachably disposed on the fixed support tube assemblyto allow the pole assemblyto switch between a use state (see) and a non-use state (see). The first mounting memberis mounted on the movable support tube assembly. Specifically, as shown in, when the pole assemblyis in the use state, the fixed support tube assemblyis connected to and is coaxial with the movable support tube assembly, and the second mounting memberis movable in an axial direction of the pole assembly, i.e., the second mounting membercan reciprocate between the fixed support tube assemblyand the movable support tube assembly. As shown in conjunction with, when the pole assemblyis in the non-use state, the movable support tube assemblyis separated from the fixed support tube assembly, in other words, the movable support tube assemblyis removed from the fixed support tube assembly. In this way, the height of the tree stand(i.e., the decorative tree) can be reduced, thereby reducing the volume of the tree stand(i.e., the decorative tree) and facilitating transferring or storing the decorative tree.

In an embodiment, one of the fixed support tube assemblyand the movable support tube assemblyincludes a first abutting end, and another of the fixed support tube assemblyand the movable support tube assemblyincludes a second abutting end. For example, the fixed support tube assemblyincludes the first abutting end(see), and the first abutting endis, for example, tapered. The movable support tube assemblyincludes the second abutting end. The first abutting endis detachably inserted into the second abutting endby a predetermined length, so that the movable support tube assemblyand the fixed support tube assemblyare detachably connected to form the pole assembly. In this way, the efficiency of disassembling and assembling the pole assemblycan be improved by the means of insertion. In another alternative embodiment, both the first abutting endand the second abutting endare provided with a thread, so that the first abutting endcan be threadedly connected to the second abutting endto improve stability and reliability when the fixed support tube assemblyis connected to the movable support tube assembly.

In an embodiment, at least one of the fixed support tube assemblyand the movable support tube assemblyincludes at least two support tubes. Specifically, in this embodiment, as shown in, the movable support tube assemblyincludes at least two support tubes. The at least two support tubesare either in detachable connection or in telescopic connection. It should be noted that the detachable connection includes, but is not limited to, a direct insertion connection, a threaded connection, or a rotating connection, etc., and the telescopic connection refers to that two adjacent support tubesare sleeved together so that a length of the movable support tube assemblycan be changed by means of telescoping. More specifically, in this embodiment, as shown in, the movable support tube assemblyincludes two support tubes. The two support tubesare in a detachable insertion connection. In order to avoid the two support tubesfrom being easily lost after being separated from each other, an elastic wireis connected between the two support tubes. Specifically, referring to, one of the support tubeshas an end forming the above second abutting end, and another end forming a third abutting end. Another of the support tubeshas an end configured to support the first mounting member, and another end forming a fourth abutting end. The third abutting endis detachably inserted into the fourth abutting endby the predetermined length, and in this case, inner cavities of the two support tubesare in communication with each other. More specifically, as shown in, the elastic wireis disposed in the inner cavities of the two support tubes. Two ends of the elastic wireare connected to the two support tubesrespectively. In this way, when it is required to shorten the length of the movable support tube assembly, the two support tubesare respectively pulled to move away from each other by hands to separate the fourth abutting endfrom the third abutting end, and then the two support tubesare placed parallel to each other. During this process, the elastic wireis stretched and then bent. In this embodiment, the height of the tree stand(or the decorative tree) can be adjusted in a larger range by providing the plurality of support tubes. Through the detachable connection or the telescopic connection, the tree stand(or the decorative tree) can be folded to have a small volume, which in turn makes it more convenient for storage or transportation.

Optionally, in another illustrated embodiment, the fixed support tube assemblyand the movable support tube assemblyare also telescopically connected, i.e., the movable support tube assemblyis inserted in the fixed support tube assembly, so that the movable support tube assemblyand the fixed support tube assemblycooperate with each other to form a telescopic pole structure. Specifically, a diameter of the fixed support tube assemblyis greater than a diameter of the movable support tube assembly, and the fixed support tube assemblyis sleeved on the movable support tube assembly. In this way, the height of the tree stand(i.e., the decorative tree) can be adjusted by means of telescoping.

Referring to, in an embodiment, one of the locking portionand the engaging portionis a limiting protrusion, and another of the locking portionand the engaging portionis a limiting groove. Specifically, in this embodiment, the locking portionis the limiting protrusion, and the engaging portionis the limiting groove. As shown in, the limiting grooveis curved. Two ends of the limiting grooveform a starting endand a locking end, respectively. The second mounting memberhas a substantially annular structure, such as a hollow cylinder or a hollow truncated cone. The second mounting member is movably sleeved on the pole assembly. The second mounting membercan reciprocate in the axial direction of the pole assembly, and be rotatable around a center axis of the second pole assembly. The first mounting memberis rotatable relative to the second mounting member, so that the limiting protrusionis capable of reciprocating between the starting endand the locking end. Specifically, when the limiting protrusionla is engaged to the locking end, the first mounting memberis fixed relative to the second mounting member. More specifically, the starting endextends through an end face of the second mounting memberfacing the first mounting member, i.e., the starting endextends through an upper end face of the second mounting member. The limiting grooveextends in a curved shape along an outer periphery of the second mounting member, and the locking endof the limiting grooveis located below the upper end face of the second mounting member. A sidewall of the limiting grooveis provided with an engaging protrusion. The engaging protrusionis located at the locking end, and is configured to abut against the limiting protrusionto limit the limiting protrusionto the locking end. More specifically, the limiting groovehas a first sidewallat least partially facing a lower end face of the second mounting member, and a second sidewallfacing the first sidewall. The engaging protrusionis disposed on the first sidewallof the limiting grooveand protrudes towards the bottom end of the pole assembly.

It should be noted that the above wording “the first mounting memberis rotatable relative to the second mounting member” may include three possible implementations as follows: the first mounting memberis rotatable around the center axis of the pole assembly, but the second mounting memberis not rotatable relative to the pole assembly; or the second mounting memberis rotatable around the center axis of the pole assembly, but the first mounting memberis not rotatable relative to the pole assembly; or the first mounting memberand the second mounting memberare both rotatable around the center axis of the pole assembly. Specifically, in this embodiment, the first mounting membermounted on the top end of the pole assemblyis rotatable around the center axis of the pole assembly, and whether the second mounting memberis rotatable around the center axis of the pole assemblyis not specifically limited thereto.

In this embodiment, as shown in, the second mounting memberincludes a locking sleeveand a connecting basewhich are connected to each other. Both the locking sleeveand the connecting baseare annular and are movably sleeved on the pole assembly. Specifically, the locking sleeveis substantially in a shape of a cylinder, and the connecting baseis substantially in a shape of a truncated cone, and the locking sleeveis connected to an upper surface of the connecting base. The engaging portionis disposed on the locking sleeve. When the engaging portionis the limiting groove, the limiting grooveextends through at least an outer side surface of the locking sleeve. The starting endof the limiting grooveextends through an end face of the locking sleevefacing away from the connecting base. Specifically, as shown in, the connecting basehas a connecting portion. The connecting portionis configured to be connected to the top of the decorative mesh. Optionally, the connecting portionmay be, for example, a connecting through-hole. The cordson the top of the decorative meshextend through the connecting through-hole to form a knot by means of knotting. The knot abuts against an opening edge of the connecting through-hole to realize connection between the decorative meshand the second mounting member. In other embodiments, after extending through the connecting through-hole, the cordsat the top of the decorative meshmay be connected to a blocking member (not shown). The blocking member is configured to abuts against the opening edge of the connecting through-hole to limit the cordsfrom separating from the second mounting member.

In an embodiment, a plurality of connecting portionsare provided. The plurality of connecting portionsare spaced apart in a circumferential direction of the connecting base. The number of connecting portionsis equal to the number of cords. In this way, each of the cordscan be connected to the second mounting memberthrough the corresponding connecting portion. In addition, a plurality of (e.g., 2, 3, or 4, etc.) locking portionsand a plurality of (e.g., 2, 3, or 4, etc.) engaging portionsare provided. The number of locking portionsis equal to the number of engaging portions. The plurality of locking portionsare spaced apart in a circumferential direction of the first mounting member, and are symmetrically distributed. The plurality of engaging portionsare spaced apart in the circumferential direction of the second mounting memberand are symmetrically distributed. In this way, the stability of the connection between the second mounting memberand the first mounting membercan be improved.