CN209990438U

CN209990438U - Multifunctional folding ladder

Info

Publication number: CN209990438U
Application number: CN201920081783.9U
Authority: CN
Inventors: 程传昌
Original assignee: Anhui Guanting Technology Co Ltd
Current assignee: Anhui Guanting Technology Co Ltd
Priority date: 2019-01-18
Filing date: 2019-01-18
Publication date: 2020-01-24
Anticipated expiration: 2029-01-18

Abstract

The utility model provides a multifunctional folding ladder relates to ladder technical field. A multi-functional folding ladder comprising: ladder sections, connecting parts and locking parts; the connecting parts comprise a first connecting part, a second connecting part and a third connecting part; the retaining member includes a first retaining member, a second retaining member, an elastic member, and a bolt. The utility model provides a multifunctional folding ladder, when the ladder is needed to be fixed, only the second locking piece needs to be simply rotated, and the tooth sockets are automatically engaged; when the movable ladder section is needed, the meshed tooth sockets can be separated only by simply rotating and pressing the second locking piece, the two ladder sections can be rotated, and the movable ladder section has the characteristic of convenience in operation.

Description

Multifunctional folding ladder

Technical Field

The utility model relates to a ladder technical field, concretely relates to multi-functional folding ladder.

Background

The ladder is generally applied to daily life, and people can climb up and down by the aid of the ladder and can contact places which are inconvenient to touch.

Because the ladder occupation space is great, a plurality of folding ladders appear on the market at present, and the storage is convenient.

The folding ladder on the market uses the bolt to realize rotating the connection between two ladder sections more, when fixed, twists the bolt, fixes each ladder section through the packing force of bolt, when needs the activity, need not become flexible the bolt, all need realize through twisting the bolt when fixed ladder and activity ladder, and the operation is comparatively complicated.

Disclosure of Invention

Technical problem to be solved

Not enough to prior art, the utility model provides a multi-functional folding ladder has solved current folding ladder and has rotated or the complicated technical problem of fixed operation.

(II) technical scheme

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

a multi-function folding ladder, comprising:

the ladder sections at least comprise two ladder sections;

the adjacent ladder sections are rotatably connected through the connecting parts;

the adjacent ladder sections are relatively fixed through the locking pieces;

wherein the connecting portion includes:

the outer side of the first connecting part is provided with a first tooth groove;

the first connecting part and the second connecting part are oppositely arranged, and a groove is formed in the outer side of the second connecting part;

the third connecting part is positioned between the first connecting part and the second connecting part and is rotatably connected with the first connecting part and the second connecting part; the third connecting part is provided with a square through hole;

the retaining member includes:

a first locking member having a second tooth slot engageable with the first tooth slot of the first coupling portion and a square boss engageable with the square through-hole;

the second locking piece is provided with a buckle, the buckle can be clamped with the groove, and the second locking piece can be connected with the first locking piece;

and the elastic piece is positioned between the second locking piece and the second connecting part.

Preferably, the retaining member further comprises a bolt, the first retaining member is provided with a threaded hole, the bolt penetrates through the second retaining member, and the bolt is connected with the threaded hole.

Preferably, the ladder sections comprise:

the number of the side rods is two, and the side rods are arranged oppositely;

the cross rod is fixed between the oppositely arranged side rods.

Preferably, the connecting portion further includes:

a first rod-like structure, a first end of the first rod-like structure being connected to the first end of the side bar, and a second end of the first rod-like structure being connected to the first connection;

a second rod-like structure, a first end of the second rod-like structure being connected to the first end of the side bar, and a second end of the second rod-like structure being connected to the second connecting portion, there being a gap between the first rod-like structure and the second rod-like structure;

a third rod-like structure, a first end of the third rod-like structure being connected to the second end of the side bar, and a second end of the third rod-like structure being connected to the third connecting portion;

the third rod-like structure is capable of passing through a gap between the first rod-like structure and the second rod-like structure.

Preferably, the first locking piece comprises a round table, a square boss and a cylindrical boss;

the square boss is positioned between the circular truncated cone and the cylindrical boss;

the second gear groove is formed in the circular truncated cone and is positioned on the side, connected with the square boss, of the circular truncated cone; the threaded hole is formed in the cylindrical boss and is located on the opposite side, connected with the square boss, of the cylindrical boss.

Preferably, an annular groove is formed in one side of the buckle of the second locking piece, and the elastic piece is arranged in the annular groove.

Preferably, the opposite sides of the buckle of the second locking piece are provided with countersunk holes, and nuts of the bolts can be sunk into the countersunk holes.

Preferably, a handle is arranged on the side surface of the second locking member.

Preferably, a first boss is arranged on the outer side of the first connecting part, and a second boss is arranged on the outer side of the second connecting part;

wherein the first locking member is insertable into the first boss;

the second retaining member is insertable into the second boss.

(III) advantageous effects

The utility model provides a multifunctional folding ladder. Compared with the prior art, the method has the following beneficial effects:

the utility model provides a multifunctional folding ladder, which is composed of a plurality of rotatably connected ladder sections, can be folded to a small enough state when being idle, is convenient to place, saves space and is convenient to carry; when the ladder is used, due to the fact that the ladder sections have sufficient rotation performance, the ladder can be transformed into a herringbone ladder, a climbing ladder and a platform ladder through rotation, and can be used as a floating ladder in a horizontal state after being completely stretched and fixed, and multiple functions are achieved.

Furthermore, the utility model provides a connect through connecting portion and retaining member between the ladder section that multi-functional folding ladder respectively links to each other, realize rotating and relatively fixed.

The elastic component is located between second connecting portion and the second retaining member, and under the elastic component spring action, second connecting portion have the trend of separating with the second retaining member, through the transmission of bolt, make first retaining member with first connecting portion have the trend of being close to. Pass through like this the axial elasticity of elastic component lets second tooth's socket meshes with first tooth's socket mutually to obtain the axial power of perpendicular to, the first retaining member of relatively fixed, first retaining member is through the square boss with square through hole matched with, fixed third connecting portion, and third connecting portion are located the ladder section, make two adjacent ladder sections relatively fixed then.

When the needs activity ladder festival, through the handle rotates the second retaining member, makes the buckle rotates groove position presses this moment the second retaining member lets the elastic component compression, thereby makes first retaining member has had the space of drunkenness in the axial, makes the tooth's socket separation of meshing then, and perpendicular to axial ascending power disappears this moment, and first retaining member is rotatable to third connecting portion also can rotate, realizes that adjacent two ladder sections encircle the retaining member and rotate.

The multifunctional folding ladder provided by the utility model only needs to simply rotate the second connecting piece when the ladder section needs to be fixed, and the tooth grooves can be automatically meshed; when the movable ladder sections are needed, only the second connecting piece needs to be simply rotated and pressed, the meshed tooth sockets can be separated, and the two ladder sections can be rotated. The utility model discloses a from the stationary state to the rotating state to and change from the rotating state to the stationary state is simpler, has overcome the comparatively complicated technical problem of ordinary folding ladder operation.

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 described below, it is obvious that the drawings in the following description are only 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 schematic view of a multi-function ladder in a folded state;

FIG. 2 is a schematic view of the connecting portion and locking member of the multi-functional ladder;

FIG. 3 is a schematic view of a first connection portion of the multi-function ladder;

FIG. 4 is a schematic view of a second connection portion of the multi-function ladder;

FIG. 5 is a schematic view of the third connection portion of the multi-functional foldable ladder

FIG. 6 is a schematic view of a first locking member of the multi-function ladder;

FIG. 7 is a schematic view of a second locking member with a buckle surface of the multi-functional ladder;

FIG. 8 is a schematic view of the second locking member of the multi-functional foldable ladder with a countersunk hole;

FIG. 9 is a schematic view of the unfolded state of the multi-function ladder;

FIG. 10 is a schematic view of the multi-function ladder in a first state;

FIG. 11 is a schematic view of the multi-function ladder in a second state;

fig. 12 is a schematic view of a third shape of the multi-functional ladder.

Wherein, ladder section 1, connecting portion 2, retaining member 3, first connecting portion 4, second connecting portion 5, third connecting portion 6, first retaining member 7, second retaining member 8, elastic element 9, bolt 10, sleeve pipe 11.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The folding ladder on the market now, the storage problem that can relax the ladder that leads to because length is fixed, but the connecting piece design between each ladder section of these folding ladders is very complicated, need twist the bolt at folding or expand fixed in-process, through the fixed two ladder sections of the packing force of bolt, to the user, the convenience that the folding ladder used has significantly reduced.

In order to solve the problem, the embodiment of the utility model provides a multifunctional folding ladder only needs to rotate the part that links to each other with the elastic component in the fixed use of expansion or folding, through the cooperation that changes recess and buckle and the effort of elastic component, changes the engaged state of tooth's socket to reach the purpose fixed with the movable ladder festival.

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.

A multi-functional folding ladder, as shown in figures 1-12, includes: ladder section 1, connecting portion 2 and retaining member 3.

The number of the ladder sections 1 is at least two, and the number of the ladder sections 1 is selected by a person skilled in the art according to actual needs;

the adjacent ladder sections 1 are in rotary connection through the connecting parts 2; and are relatively fixed through the locking piece 3;

wherein the connecting portion 2 includes: a first connection 4, a second connection 5 and a third connection 6. A first tooth groove 402 is formed in the outer side of the first connecting part 4, and a first through hole 403 is formed in the first connecting part 4; the first connecting part 3 and the second connecting part 5 are arranged oppositely, a groove 502 is arranged on the outer side of the second connecting part 5, and a second through hole 503 is arranged on the second connecting part 5; the third connecting part 6 is positioned between the first connecting part 4 and the second connecting part 5 and is rotatably connected with the first connecting part 4 and the second connecting part 5, and the third connecting part 6 is provided with a square through hole 601;

the retaining member 3 includes: a first locking member 7, a second locking member 8 and an elastic member 9. The first locking member 7 has a second tooth slot 702 and a square boss 703, the second tooth slot 702 can be engaged with the first tooth slot 402 of the first connecting part 4, the square boss 703 can be matched with the square through hole 601, and the first locking member 7 can be inserted into the first through hole 403 and the second through hole 503; the second locking member 8 is provided with a catch 802, the catch 802 can be caught by the groove 502, and the second locking member 8 can be connected with the first locking member 7; the elastic member 9 is located between the second locker 8 and the second connecting portion 5.

In particular, the second locking member 8 is rotatable; when changing from the rotation state to the fixed state, under the elasticity of elastic component 9, second connecting portion 4 has the trend of separating with second retaining member 8, second retaining member 8 can with first retaining member 7 is connected, drives first retaining member 7 with first connecting portion 4 has the trend of being close to. Thus, the second tooth groove 702 is engaged with the first tooth groove 402 by the elastic force of the elastic member 9 in the axial direction, so as to obtain a force perpendicular to the axial direction, and relatively fix the first locking member 7, the first locking member 7 fixes the third connecting portion 6 by the square boss 703 matched with the square through hole 601, and the third connecting portion 6 is located on the ladder section 1, so that the two adjacent ladder sections 1 are fixed.

When changing into the rotation state from the fixed state, rotate second retaining member 8 through handle 801, make buckle 802 rotate to recess 502 position, press this moment second retaining member 8 lets elastic component 9 compress to make first retaining member 7 have the space of drunkenness in the axial, then make the tooth's socket separation of meshing, the ascending power of perpendicular to axial at this moment disappears, first retaining member 7 is rotatable, thereby third connecting portion 6 also can rotate, realizes that two adjacent ladder sections encircle the retaining member and rotate.

The folding ladder on the market at present uses two ladder sections of bolt fixed more, and from the rotating state to the fixed state, and change from the fixed state to the rotating state needs to twist the bolt and realizes, and inevitable like this needs the help of the instrument, and often lack the instrument at the use scene, or need extra portable instrument, increase burden. The utility model provides a multi-functional folding ladder from the rotating-state to the stationary condition to and the change from the stationary condition to the rotating-state only needs simple rotation and presses second retaining member 8 and just can realize, easy operation, and need not be with the help of the instrument, simplified folding ladder's operation greatly.

Just because of simple and convenient fixing and rotating modes, the multifunctional folding ladder provided by the utility model can be folded into a folded state through simple and convenient operation, as shown in figure 1, the folding ladder is convenient to store and saves space on one hand when being folded to a small enough state; on the other hand, the portable electric heating cooker is convenient to carry;

meanwhile, the ladder can be folded to form a multi-purpose ladder state through simple operation, as shown in fig. 9, the ladder can be completely unfolded, the length of the ladder can be selected according to needs to form a climbing ladder, and climbing is realized, and the ladder can be used as a floating ladder and used for building a simple bridge if being completely unfolded and in a horizontal state.

Folded to the state shown in fig. 10, used as a herringbone ladder, or folded to the states shown in fig. 11 and 12. Thereby realizing the multi-purpose of one ladder.

In the above embodiment, in order to facilitate connection, as shown in fig. 1, the locking member 3 further includes a bolt 10 and a sleeve 11, the first locking member 7 is provided with a threaded hole 705, the second locking member 8 is provided with a third through hole 805, the bolt 10 penetrates through the third through hole 805 of the second locking member 8 and the sleeve 11, and the bolt 10 is connected with the threaded hole 705.

The first locking piece 7 and the second locking piece 8 are connected through the bolt 10, and therefore disassembly and maintenance are facilitated. When fixed, under the elastic force of the elastic member 9, the second connecting portion 4 and the second locking member 8 tend to separate, and the first locking member 7 and the first connecting portion 4 tend to be pulled close by the transmission of the bolt 10. Thus, the second tooth groove 702 is engaged with the first tooth groove 402 by the elastic force of the elastic member 9 in the axial direction, so that a force perpendicular to the axial direction is obtained, and the two ladder sections are fixed.

When the movable ladder section is rotated, the second locking part 8 is pressed and the bolt 10 compresses the elastic part 9 after the second locking part 8 is rotated, the first locking part 7 is allowed to have a space for play in the axial direction through the transmission of the bolt 10, then the meshed tooth sockets are separated, the force in the axial direction perpendicular to the moment disappears, and the two ladder sections can rotate.

In the implementation of the above embodiment, as shown in fig. 8, the ladder section 1 includes two oppositely disposed side bars 101, and a cross bar 102 between the side bars 101.

In the specific implementation process of the above embodiment, in order to obtain a larger rotation angle, the following design is adopted: the connecting portion 2 further includes: a first rod structure 404, a second rod structure 504, and a third rod structure 602; a first end of the first rod-shaped structure 404 is connected with a first end of the side rod 101, and a second end of the first rod-shaped structure 404 is connected with the first connecting part 4; the first end of the second rod-shaped structure 504 is connected with the first end of the side rod 101, the second end of the second rod-shaped structure 504 is connected with the second connecting part 5, and a gap is reserved between the first rod-shaped structure 404 and the second rod-shaped structure 504; the first end of the third rod-like structure 602 is connected to the second end of the side bar 10, and the second end of the third rod-like structure 602 is connected to the third connecting portion 6; the third rod structure 602 can pass through a gap between the first rod structure 404 and the second rod structure 504.

The third rod-shaped structure 602 can pass through the gap between the first rod-shaped structure 404 and the second rod-shaped structure 504, so that when the ladder section 1 is rotated, the rotation angle can be enlarged as much as possible, and the ladder section is suitable for more application scenarios.

In the above embodiment, as shown in fig. 6, in a specific implementation process, the first locking member 7 includes a circular truncated cone 701, a square boss 703, and a cylindrical boss 704; the square boss 703 is positioned between the round table 701 and the cylindrical boss 704; the second tooth groove 702 is arranged on the circular truncated cone 701 and is positioned on one side, connected with the square boss 703, of the circular truncated cone 701; the threaded hole 705 is formed in the cylindrical boss 704 on the side opposite to the side where the cylindrical boss 704 is connected to the square boss 703.

In the above embodiment, as shown in fig. 7, in order to facilitate the fixing and positioning of the elastic member 9, an annular groove 804 is formed inside the side of the buckle 802 of the second locking member 8, and the elastic member 9 is disposed in the annular groove 804.

In the above embodiment, as shown in fig. 8, the second locking member 8 has a counter-sunk hole 803 at the opposite side of the buckle 802, and the nut of the bolt 10 can be sunk into the counter-sunk hole 803.

In the above embodiment, in order to facilitate the rotation of the second locking member 8, the second locking member 8 is provided with a handle 801 at a side thereof, and the handle 801 is provided.

In the specific implementation process of the above embodiment, a first boss 401 is arranged on the outer side of the first connecting portion 4, and a second boss 501 is arranged on the outer side of the second connecting portion 5; wherein the first locking member 7 is insertable into the first boss 401; the second locking member 8 can be inserted into the second boss 501; the positioning of the first locking piece 7 and the second locking piece 8 is facilitated through the arrangement of the bosses; facilitating the engagement of the two tooth slots and the mating of the catch 802 with the recess 502.

When fixed, the second connecting part 5 and the second locking part 8 have a separation tendency, and the first locking part 7 and the first connecting part 4 have a tendency to approach through the transmission of the bolt 10. Thus, the second tooth groove 702 is engaged with the first tooth groove 402 by the elastic force of the elastic member 9 in the axial direction, so that a force perpendicular to the axial direction is obtained, and the two ladder sections are fixed.

When the movable ladder section is needed, the handle 801 rotates the second locking piece 8, the buckle 802 rotates to the position of the groove 502, the second locking piece 8 is pressed at the moment, the elastic piece 9 is compressed, the first locking piece 7 has a play space in the axial direction, then the engaged tooth sockets are separated, the force perpendicular to the axial direction disappears at the moment, and the two ladder sections can rotate.

The side bar 101 and the cross bar 102 described in the above embodiments may be made of an aluminum alloy material, a glass fiber reinforced plastic material, or a carbon fiber material.

The side rods 101 and the cross rods 102 may be of a circular tube structure, a square tube structure, an oval structure, a D-shaped tube structure, or other rod-shaped structures, and may be selected by a specific person skilled in the art as needed.

To sum up, the embodiment of the utility model provides a pair of multi-functional folding ladder, than prior art, possesses following beneficial effect:

the embodiment of the utility model provides a multifunctional folding ladder, when ladder sections need to be fixed, only the second connecting piece needs to be simply rotated, and tooth sockets are automatically engaged; when the movable ladder sections are needed, only the second connecting piece needs to be simply rotated and pressed, the meshed tooth sockets can be separated, and the two ladder sections can be rotated. The utility model discloses a from the stationary state to the rotating state to and change from the rotating state to the stationary state is simpler, has overcome the comparatively complicated technical problem of ordinary folding ladder operation.

The embodiment of the utility model provides a multifunctional folding ladder, which is composed of a plurality of rotatably connected ladder sections, can be simply folded to a small enough state when being idle, is convenient to place, saves space and is convenient to carry; when the ladder is used, due to the fact that the ladder sections have sufficient rotation performance and the fixed state and the rotation state are changed, the required operation is simpler, the ladder can be rotated and deformed into a herringbone ladder, a climbing ladder and a platform ladder through simple operation, and can be used as a floating ladder in a horizontal state after being completely stretched and fixed, and multiple functions are achieved.

The embodiment of the utility model provides a connecting piece quantity of multi-functional folding ladder is less, converts the elasticity of spring into the axial power of perpendicular to through specific structure, has guaranteed the reliability and the security of connecting.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

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

Claims

1. A multi-functional folding ladder, its characterized in that includes:

the ladder section (1), the ladder section (1) comprises at least two ladder sections;

the adjacent ladder sections (1) are rotatably connected through the connecting parts (2);

the locking pieces (3) are used for fixing the adjacent ladder sections (1) relatively through the locking pieces (3);

wherein the connecting portion (2) comprises:

the outer side of the first connecting part (4) is provided with a first tooth groove (402);

the first connecting part (4) and the second connecting part (5) are arranged oppositely, and a groove (502) is arranged on the outer side of the second connecting part (5);

a third connecting portion (6), the third connecting portion (6) being located between the first connecting portion (4) and the second connecting portion (5), and being rotatably connected to the first connecting portion (4) and the second connecting portion (5); the third connecting part (6) is provided with a square through hole (601);

the retaining member (3) comprises:

a first locking member (7), said first locking member (7) having a second spline (702) and a square boss (703), said second spline (702) being engageable with said first spline (402) of said first connector portion (4), said square boss (703) being engageable with said square through hole (601) of said third connector portion (6);

a second locking member (8), said second locking member (8) being provided with a catch (802), said catch (802) being capable of catching with said recess (502) and said second locking member (8) being capable of being connected with said first locking member (7);

an elastic member (9), the elastic member (9) being located between the second locking member (8) and the second connecting portion (5).

2. The multi-functional attic ladder of claim 1, wherein said locking member (3) further comprises:

the bolt (10), first retaining member (7) are equipped with screw hole (705), bolt (10) run through second retaining member (8), bolt (10) with screw hole (705) are connected.

3. The multi-functional attic ladder of claim 1, wherein said ladder sections (1) comprise:

the number of the side rods (101) is two, and the side rods (101) are arranged oppositely;

the cross rod (102), the cross rod (102) is fixed between the relative side rods (101).

4. The multi-functional attic ladder of claim 3, wherein said connecting portion (2) further comprises:

a first rod-shaped structure (404), a first end of the first rod-shaped structure (404) is connected with a first end of the side rod (101), and a second end of the first rod-shaped structure (404) is connected with the first connecting part (4);

a second rod-like structure (504), a first end of the second rod-like structure (504) being connected to a first end of the side bar (101), and a second end of the second rod-like structure (504) being connected to the second connecting portion (5), there being a gap between the first rod-like structure (404) and the second rod-like structure (504);

a third rod-like structure (602), a first end of the third rod-like structure (602) being connected to a second end of the side bar (101), and a second end of the third rod-like structure (602) being connected to the third connecting portion (6);

the third rod-like structure (602) is capable of passing through a gap between the first rod-like structure (404) and the second rod-like structure (504).

5. The multi-functional attic ladder of claim 2, wherein said first locking member (7) comprises a circular truncated cone (701), a square boss (703) and a cylindrical boss (704);

the square boss (703) is positioned between the circular truncated cone (701) and the cylindrical boss (704);

the second tooth groove (702) is arranged on the circular truncated cone (701) and is positioned on one side, connected with the square boss (703), of the circular truncated cone (701); the threaded hole (705) is formed in the cylindrical boss (704) and is located on the side, opposite to the side where the cylindrical boss (704) is connected with the square boss (703).

6. The multi-functional ladder of claim 1, characterized in that the second locking member (8) has a ring-shaped groove (804) inside the side of the catch (802), and the elastic member (9) is disposed in the ring-shaped groove (804).

7. The multi-functional attic ladder of claim 2, characterized in that the buckle (802) of the second locking member (8) is provided with a counter-sunk hole (803) on the opposite side, the nut of the bolt (10) being capable of being sunk into the counter-sunk hole (803).

8. The multi-functional attic ladder of claim 1, wherein the second locking member (8) is provided with a handle (801) at a side thereof.

9. The multi-functional folding ladder of claim 1, characterized in that, the first connection part (4) is provided with a first boss (401) on the outside, and the second connection part (5) is provided with a second boss (501) on the outside;

wherein the first locking member (7) is insertable into the first boss (401);

the second locking member (8) can be inserted into the second boss (501).