CN213711514U

CN213711514U - Corner connecting piece and storage box with same

Info

Publication number: CN213711514U
Application number: CN202022511636.6U
Authority: CN
Inventors: 兰文清
Original assignee: Fujian Mingta Toys Co ltd
Current assignee: Fujian Mingta Toys Co ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-07-16
Anticipated expiration: 2030-11-03

Abstract

The utility model relates to a corner connecting piece and have receiver of this connecting piece. The connecting structure comprises two connecting bodies, one ends of the connecting bodies are vertically crossed and connected, a side plate mounting groove is formed in the middle of each connecting body, a slot opening of each side plate mounting groove is formed in the side wall corresponding to the free end of each connecting body, and the side wall extends and is sunken towards the side corresponding to the fixed connecting end of each connecting body; the lower part of corner connecting piece still is equipped with the bottom plate mounting groove, and the slot mouth setting of bottom plate mounting groove is linked together on the inside wall of corner connecting piece lower part one side inwards and with the curb plate mounting groove of two connectors, and the both ends of the slot mouth of bottom plate mounting groove still link up respectively to the lateral wall of two connector free ends places side on. The utility model discloses this corner connecting piece can be simple and easy quick with each erect put curb plate and bottom plate and cooperate the concatenation, directly piece into the receiver, have stable in structure firmly, concatenation easy operation and increase the advantage of receiver aesthetic property.

Description

Corner connecting piece and storage box with same

Technical Field

The utility model relates to a corner connection structure is a corner connecting piece and has receiver of this connecting piece very much.

Background

Traditional wooden receiver adopts complicated falcon structure to assemble the concatenation more, and falcon structure is the extremely exquisite complicated component connection mode, needs skilled teacher's work several days of technique just can make the completion, and the cost of manufacture is very high. The current receiver also directly uses connecting pieces such as screw or nail to carry out fixed connection with each sheet material in corner position, but this corner connected mode's stability is relatively poor to the aesthetic property of receiver is comparatively ordinary.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the shortcoming provides a corner connecting piece and has receiver of this connecting piece above overcoming, and this corner connecting piece can be simple and easy quick with each erect put curb plate and bottom plate and cooperate the concatenation, directly piece up the receiver, have stable in structure firmly, concatenation easy operation and increase the advantage of receiver aesthetic property.

The utility model discloses a following technical scheme realizes:

the first scheme is as follows:

a corner connector characterized by: the corner connecting piece comprises two connecting bodies with one ends vertically crossed and connected, each connecting body extends along the vertical direction, a vertically arranged side plate mounting groove for inserting one end of a vertically arranged side plate is arranged in the middle of each connecting body, a slot opening of each side plate mounting groove is formed in the side wall corresponding to the free end of the connecting body, and the side wall extends and is sunken towards the side where the fixed connecting end of the corresponding connecting body is located;

the lower part of corner connecting piece still is equipped with the bottom plate mounting groove that is used for cartridge bottom plate one corner that the level set up, the slot opening setting of bottom plate mounting groove is on the inside wall of corner connecting piece lower part one side inwards and from this inside wall to the outside wall place orientation of corner connecting piece one side outwards extend sunken and be linked together with the curb plate mounting groove of two connectors, and the both ends of the slot opening of bottom plate mounting groove still extend respectively along the horizontal direction and link up to the lateral wall of two connector free end places sides on.

Preferably, the height of the position of the lower side groove wall of the side plate mounting groove is lower than the height of the position of the slot opening of the bottom plate mounting groove.

In order to facilitate locking and fixing the side plates, more than one thread through hole which is perpendicular to the corresponding connecting body and extends through the outer side wall of the corresponding connecting body to the corresponding side plate mounting groove is arranged on the outer side wall of each connecting body, and the thread through holes are used for facilitating the locking and fixing of the vertical side plates mounted in the side plate mounting grooves by screws through the thread through holes. When the number of the thread through holes on the corresponding connecting body is more than two, the thread through holes are arranged at intervals along the vertical direction.

In order to prevent the curb plate extrusion deformation, be provided with more than one downward protrusion or the convex last rib that makes progress and rib down on the upper and lower both sides cell wall of every curb plate mounting groove respectively to still be provided with more than one respectively to convex side rib in the curb plate mounting groove on the two perpendicular side cell walls of putting of every curb plate mounting groove, when the quantity that is located the same perpendicular side rib of putting on the curb plate mounting groove side cell wall of curb plate mounting groove is more than two, each side rib is arranged along vertical direction interval, and go up rib, lower rib and side rib and all extend the setting along the horizontal direction.

Preferably, in the process of extending from the slot opening position of the side plate mounting groove to the side plate mounting groove, the distance between the bottom of the side wall connection of the upper rib, the lower rib and the side rib and the corresponding groove to the top far away from the connection bottom is gradually increased so that the vertical side plate can be inserted more and more tightly in the process of inserting into the side plate mounting groove.

In order to save manufacturing material, thereby the tank bottom of curb plate mounting groove is extended the crossing position of corner connecting piece and is link up as an organic whole with the tank bottom of opposite side plate mounting groove and form a intercommunication groove, the corner connecting piece still includes the limiting plate that sets up in the middle of the intercommunication groove on buckling the position more than a slice, the both ends of limiting plate extend the protrusion to the opening direction that is close to the intercommunication groove both ends respectively to make the both ends of limiting plate can carry on spacingly to the mounted position of two blocks of perpendicular curb plates of interpolation dress in the intercommunication groove respectively, when the quantity of limiting plate is more than two, each limiting plate top-down interval layering sets up.

In order to further guarantee the stability that the bottom plate supported, the middle bending position of the lower end of the communicating groove is provided with a supporting table protruding upwards, and the upper surface of the supporting table is flush with the lower edge line of the inserting groove opening of the bottom plate installing groove.

In order to facilitate the installation of the top plate, the corner connecting piece further comprises a supporting flange which is arranged on the inner side walls of the two connecting bodies and protrudes outwards along the horizontal direction and is used for supporting one corner of the top plate, and the supporting flange is positioned above the inserting groove opening of the bottom plate installation groove.

Preferably, the intersection position of the two connecting bodies is a circular arc transition.

Preferably, the corner connector is integrally injection molded.

Scheme II:

the utility model provides a receiver with scheme one corner connecting piece, its characterized in that: the storage box comprises four corner connecting pieces, four vertical side plates and a bottom plate, wherein the four corner connecting pieces are respectively located at four quadrilateral corners, two ends of each vertical side plate are respectively in plug-in connection with side plate mounting grooves of the corner connecting pieces corresponding to the corner positions, and the bottom plate is arranged between the vertical side plates and is respectively inserted into the bottom plate mounting grooves of the corner connecting pieces at four corners.

In order to facilitate the connection between the vertical side plates and the bottom plate, horizontal straight line slots which are arranged in a horizontally extending mode and used for being connected with four sides of the bottom plate in an inserting mode are further arranged at the positions, with the same height position as the slot openings of the bottom plate mounting grooves, of the lower portion of the inner side wall of each vertical side plate, and the four sides of the bottom plate are respectively inserted into the horizontal straight line slots of the vertical side plates.

In order to facilitate the separation of different storage areas, the storage box further comprises more than one partition plate which is arranged on the bottom plate and upwards extends along the vertical direction to divide the storage space formed by the inner side wall of each vertical side plate and the upper surface of the bottom plate into different storage areas.

Preferably, the storage box further comprises a top plate covered in a space surrounded by the vertical side plates, and four corners of the top plate are movably supported on the supporting flanges of the corner connecting pieces respectively.

In order to facilitate the taking out of the top plate, the top of the pair of vertical side plates at opposite positions is provided with an arc-shaped groove which penetrates through the inner side wall and the outer side wall of the corresponding vertical side plate, and the notch of the arc-shaped groove is arranged on the upper surface of the corresponding vertical side plate and is downwards sunken to a position lower than the top plate, so that the top plate can be taken out upwards through the arc-shaped groove.

In order to facilitate the positioning and installation between the top plate and the supporting flange, the upper surface of the supporting flange is provided with a positioning groove which is sunken downwards from the upper surface, and the bottom of the top plate is provided with a positioning body which is convex downwards and can be matched and installed with the corresponding positioning groove at the position corresponding to the positioning groove.

Preferably, the inner side wall of the vertical side plate is provided with a vertical linear slot which is convenient for the side edge of the separation plate to insert at a position adjacent to the separation plate, and the lower end of the vertical linear slot is communicated with the horizontal linear slot.

Compared with the prior art, the utility model has the advantages that:

1. the utility model relates to a corner connecting piece and have receiver of this connecting piece, this corner connecting piece can be simple and easy quick with each erect put curb plate and bottom plate and cooperate the concatenation, directly piece up the receiver, have stable in structure firmly, splice easy operation and increase the advantage of receiver aesthetic property.

2. The utility model relates to a corner connecting piece and have receiver of this connecting piece still are equipped with the screw thread through-hole on this corner connecting piece, and the screw can fix each curb plate closure through the screw thread through-hole to the stability and the fastness of receiver after further increasing the concatenation.

3. The utility model relates to a corner connecting piece and have receiver of this connecting piece still are equipped with rib, lower rib and side rib on this corner connecting piece, and each rib can reduce to erect the area of contact who puts curb plate and mounting groove, turns into the line contact by the face contact, can effectively prevent to erect the deformation of putting curb plate mounted position.

4. The utility model relates to a corner connecting piece and have receiver of this connecting piece, wherein each rib is that the slope sets up, and each curb plate can insert more tightly at the installation, and the fastness is good.

5. The utility model relates to a corner connecting piece and have receiver of this connecting piece, wherein two mounting grooves of corner connecting piece link up to a intercommunication groove to add the limiting plate in the intercommunication groove, this structure can reduce the material, practices thrift the cost.

6. The utility model relates to a corner connecting piece and have receiver of this connecting piece still is equipped with the support boss on the corner connecting piece wherein so that place the roof.

7. The utility model relates to a corner connecting piece and have receiver of this connecting piece, corner connecting piece injection moulding as an organic whole, processing is convenient and production efficiency is high.

8. The utility model relates to a corner connecting piece and have receiver of this connecting piece, wherein the whole aesthetic property of receiver is good, sound construction moreover.

Drawings

FIG. 1 is a first schematic view illustrating a usage state of a corner connector according to the present invention;

FIG. 2 is a schematic view showing a second usage state of the corner connector according to the present invention;

FIG. 3 is a first schematic structural view of the corner connector of the present invention;

FIG. 4 is a second schematic structural view of the corner connector of the present invention;

FIG. 5 is a first schematic structural view of the storage box of the present invention;

FIG. 6 is a second schematic structural view of the storage box of the present invention;

fig. 7 is an enlarged schematic view of a in fig. 1.

Description of reference numerals: the structure comprises 1-corner connecting piece, 11-connecting piece, 12-side plate mounting groove, 121-lower rib, 122-side rib, 13-bottom plate mounting groove, 14-thread through hole, 15-limiting plate, 16-supporting table, 17-supporting flange, 18-positioning groove, 2-vertical side plate, 21-horizontal straight line slot, 22-arc groove, 23-vertical straight line slot, 3-bottom plate, 4-partition plate, 5-top plate and 6-screw.

Detailed Description

The invention is explained in detail below with reference to the accompanying drawings:

the first embodiment is as follows:

as shown in fig. 1-7, a corner connector, comprising: the corner connecting piece 1 comprises two connecting bodies 11 with one ends vertically intersected and connected, each connecting body 11 extends along the vertical direction, a vertically arranged side plate mounting groove 12 for inserting one end of a vertically arranged side plate 2 is arranged in the middle of each connecting body 11, a slot opening of each side plate mounting groove 12 is arranged on the side wall corresponding to the free end of the connecting body 11, and extends and dents from the side wall to the side corresponding to the fixed connecting end of the connecting body 11;

the lower part of corner connecting piece 1 still is equipped with the bottom plate mounting groove 13 that is used for 3 one corners of cartridge bottom plate that the level set up, the slot mouth of bottom plate mounting groove 13 sets up on the inside wall of corner connecting piece 1 lower part one side inwards and from this inside wall to the outside lateral wall place direction of corner connecting piece 1 one side extend sunken and be linked together with the curb plate mounting groove 12 of two connectors 11, and the both ends of the slot mouth of bottom plate mounting groove 13 still extend along the horizontal direction respectively and link up to the lateral wall of two connectors 11 free ends places sides.

Preferably, the height of the lower side wall of the side plate mounting groove 12 is lower than the height of the slot opening of the bottom plate mounting groove 13.

In order to facilitate locking and fixing the side plates, more than one threaded through hole 14 is arranged on the outer side wall of each connecting body 11, is perpendicular to the corresponding connecting body 11, and extends through the outer side wall of the corresponding connecting body 11 to the corresponding side plate mounting groove 12, and the threaded through hole 14 is used for facilitating the screw 6 to lock and fix the vertical side plate 2 mounted in the side plate mounting groove 12 through the threaded through hole 14. When the number of the threaded through holes 14 on the corresponding connecting body 11 is two or more, the threaded through holes 14 are arranged at intervals in the vertical direction.

In order to prevent the side plate from extruding and deforming, more than one upward rib and lower rib 121 which protrude downwards or protrude upwards are respectively arranged on the upper side wall and the lower side wall of each side plate mounting groove 12, more than one side rib 122 which protrudes into the side plate mounting groove 12 is also respectively arranged on the two vertical side groove walls of each side plate mounting groove 12, when the number of the side ribs 122 which are positioned on the same vertical side groove wall of each side plate mounting groove 12 is more than two, each side rib 122 is arranged at intervals along the vertical direction, and the upper rib, the lower rib 121 and the side ribs 122 are all arranged along the extension of the horizontal direction.

Preferably, in the process of extending from the slot opening position of the side plate mounting slot 12 to the inside of the side plate mounting slot 12, the distance between the bottom of the connection of the upper rib, the lower rib 121 and the side rib 122 with the corresponding slot side wall and the top far away from the connection bottom is gradually increased so that the vertical side plate 2 can be inserted more and more tightly in the process of being inserted into the side plate mounting slot 12.

In order to save manufacturing material, thereby the tank bottom of curb plate mounting groove 12 extends the crossing position of corner connecting piece 1 and link up as an organic whole with the tank bottom of another curb plate mounting groove 12 and form a intercommunication groove, thereby corner connecting piece 1 still includes the limiting plate 15 that sets up in the middle of the intercommunication groove on the position of buckling more than a slice, the both ends of limiting plate 15 extend the protrusion to the opening direction that is close to the intercommunication groove both ends respectively to make the both ends of limiting plate 15 can carry on spacingly to the mounted position of two blocks of vertical curb plates 2 of interpolation dress in the intercommunication groove respectively, when the quantity of limiting plate 15 is more than two, each limiting plate 15 top-down interval layering sets up.

In order to further ensure the stability of the bottom plate support, an upward convex support platform 16 is arranged at the middle bending position of the lower end of the communication groove, and the upper surface of the support platform 16 is flush with the lower edge line of the insertion groove opening of the bottom plate installation groove 13.

In order to facilitate the installation of the top plate, the corner connector 1 further comprises a support flange 17 which is arranged on the inner side wall of the two connecting bodies 11 and protrudes outwards along the horizontal direction and is used for supporting one corner of the top plate 5, and the support flange 17 is positioned above the slot opening of the bottom plate installation slot 13.

Preferably, the intersection position of the two connecting bodies 11 is a circular arc transition.

Preferably, the corner connector 1 is integrally injection-molded.

Example two:

as shown in fig. 1 to 7, a storage box with a corner connector according to the first embodiment is characterized in that: the quantity of corner connecting piece 1 is four and is in the position at four tetragonal angles respectively, the receiver still includes that four erect and put curb plate 2 and a bottom plate 3, and each erects the both ends of putting curb plate 2 and respectively with the curb plate mounting groove 12 grafting connection of the corner connecting piece 1 that corresponds the corner position, bottom plate 3 sets up and erects between putting curb plate 2 and four angles cartridge respectively in the bottom plate mounting groove 13 of each corner connecting piece 1 at each.

In order to facilitate the connection between the vertical side plates and the bottom plate, horizontal linear slots 21 which are arranged in a horizontally extending manner and used for being in plug-in connection with four sides of the bottom plate 3 are further arranged at the positions, with the same height position as the slot openings of the bottom plate mounting grooves 13, of the lower portion of the inner side wall of each vertical side plate 2, and the four sides of the bottom plate 3 are respectively in plug-in connection with the horizontal linear slots 21 of each vertical side plate 2.

In order to facilitate the separation of different storage areas, the storage box further comprises more than one partition plate 4 which is arranged on the bottom plate 3 and extends upwards along the vertical direction to separate the storage space formed by enclosing the inner side wall of each vertical side plate 2 and the upper surface of the bottom plate 3 into different storage areas.

Preferably, the storage box further comprises a top plate 5 covered in the space enclosed by each vertical side plate 2, and four corners of the top plate 5 are movably supported on the supporting flanges 17 of each corner connecting piece 1 respectively.

In order to facilitate the taking out of the top plate, the top of the pair of vertical side plates 2 at opposite positions is provided with an arc-shaped groove 22 penetrating between the inner side wall and the outer side wall of the corresponding vertical side plate 2, and the notch of the arc-shaped groove 22 is arranged on the upper surface of the corresponding vertical side plate 2 and is downwards sunken to a position lower than the top plate 5, so that the top plate 5 can be taken out upwards through the arc-shaped groove 22.

In order to facilitate the positioning and installation between the top plate and the supporting flange, the upper surface of the supporting flange 17 is provided with a positioning groove 18 which is recessed downwards from the upper surface, and the bottom of the top plate 5 is provided with a positioning body which is protruded downwards at a position corresponding to the positioning groove 18 and can be installed in a matching way with the corresponding positioning groove 18.

Preferably, a vertical linear slot 23 which is convenient for inserting the side edge of the partition plate 4 is arranged on the inner side wall of the vertical side plate 2 at a position adjacent to the partition plate 4, and the lower end of the vertical linear slot 23 is communicated with the horizontal linear slot 21.

While the present invention has been shown and described with reference to particular embodiments and alternatives thereof, it will be understood that various changes and modifications can be made without departing from the spirit and scope of the invention. It is understood, therefore, that the invention is not to be limited, except as by the appended claims and their equivalents.

Claims

1. A corner connector characterized by: the corner connecting piece (1) comprises two connecting bodies (11) with one ends vertically intersected and connected, each connecting body (11) extends along the vertical direction, a vertically-arranged side plate mounting groove (12) for inserting one end of a vertically-arranged side plate (2) is formed in the middle of each connecting body (11), a slot opening of each side plate mounting groove (12) is formed in a side wall corresponding to the free end of each connecting body (11), and the side wall extends and is sunken towards the side where the fixed connecting end of each connecting body (11) is located;

the lower part of corner connecting piece (1) still is equipped with bottom plate mounting groove (13) that the level set up be used for cartridge bottom plate (3) one corner, the slot opening setting of bottom plate mounting groove (13) is on the inside wall of corner connecting piece (1) lower part one side inwards and from this inside wall to corner connecting piece (1) outside lateral wall place direction of one side extend sunken and be linked together with curb plate mounting groove (12) of two connectors (11), the both ends of the slot opening of bottom plate mounting groove (13) still extend along the horizontal direction respectively and link up to the lateral wall of two connectors (11) free end place sides on.

2. The corner connector according to claim 1, wherein: the height of the position of the lower side groove wall of the side plate mounting groove (12) is lower than that of the position of the slot opening of the bottom plate mounting groove (13).

3. The corner connector according to claim 1, wherein: more than one thread through hole (14) which is perpendicular to the corresponding connecting body (11) and extends to penetrate through the outer side wall of the corresponding connecting body (11) to the corresponding side plate mounting groove (12) is arranged on the outer side wall of each connecting body (11), and the thread through holes (14) are used for facilitating the locking and fixing of the vertical side plates (2) mounted in the side plate mounting grooves (12) through the thread through holes (14) by screws (6).

4. The corner connector according to claim 1, wherein: be provided with more than one downward protrusion or convex last rib and lower rib (121) that makes progress on the upper and lower both sides cell wall of every curb plate mounting groove (12) respectively to still be provided with more than one convex side rib (122) in curb plate mounting groove (12) groove respectively on the two perpendicular side cell walls of putting of every curb plate mounting groove (12), when the quantity that is located the same side rib (122) of putting of curb plate mounting groove (12) on the side cell wall of erectting is more than two, each side rib (122) are arranged along vertical direction interval, and go up rib, lower rib (121) and side rib (122) and all extend the setting along the horizontal direction.

5. The corner connector according to claim 4, wherein: in the process of extending from the slot opening position of the side plate mounting groove (12) to the inside of the side plate mounting groove (12), the distance between the bottom of the upper rib, the lower rib (121) and the side rib (122) connected with the corresponding groove side wall and the top far away from the connected bottom is gradually increased so that the vertical side plate (2) can be inserted more and more tightly in the process of inserting into the side plate mounting groove (12).

6. The corner connector according to claim 1, wherein: the tank bottom of curb plate mounting groove (12) is extended the crossing position of corner connecting piece (1) and is link up as an organic whole with the tank bottom of opposite side plate mounting groove (12) thereby to form a intercommunication groove, corner connecting piece (1) still includes limiting plate (15) that set up in the middle of the intercommunication groove on buckling the position more than a slice, the both ends of limiting plate (15) extend the protrusion to the opening direction that is close to the intercommunication groove both ends respectively to the both ends that make limiting plate (15) can be respectively to the mounted position of two blocks of erectting in the intercommunication groove and put curb plate (2) spacing, when the quantity of limiting plate (15) is more than two, each limiting plate (15) top-down interval layering sets up.

7. The corner connector according to claim 6, wherein: the middle bending position of the lower end of the communicating groove is provided with an upward convex supporting table (16), and the upper surface of the supporting table (16) is flush with the lower edge line of the inserting groove opening of the bottom plate installing groove (13).

8. The corner connector according to claim 1, wherein: the corner connecting piece (1) further comprises a supporting flange (17) which is arranged on the inner side walls of the two connecting bodies (11) and protrudes outwards along the horizontal direction and is used for supporting one corner of the top plate (5), and the supporting flange (17) is located above the insertion groove opening of the bottom plate installation groove (13).

9. The corner connector according to claim 1, wherein: the intersection position of the two connecting bodies (11) is in arc transition.

10. The corner connector according to claim 1, wherein: the corner connecting piece (1) is integrally formed by injection molding.

11. A storage box with the corner connector of any one of claims 1-10, wherein: the storage box comprises four corner connecting pieces (1), four vertical side plates (2) and a bottom plate (3), wherein the two ends of each vertical side plate (2) are connected with side plate mounting grooves (12) of the corner connecting pieces (1) corresponding to corner positions in an inserting mode, the bottom plate (3) is arranged between the vertical side plates (2) and four corners are respectively inserted into the bottom plate mounting grooves (13) of the corner connecting pieces (1).

12. The storage cassette of claim 11, wherein: the lower part of the inner side wall of each vertical side plate (2) is also provided with a horizontal straight line slot (21) which is arranged in a horizontal direction in an extending way and is used for being in plug-in connection with four edges of the bottom plate (3) at the position with the same height position as the slot opening of the bottom plate mounting groove (13), and the four edges of the bottom plate (3) are respectively plugged in the horizontal straight line slots (21) of each vertical side plate (2).

13. The storage box according to claim 12, wherein: the receiver still includes more than setting up on bottom plate (3) and along vertical direction upwards extend the setting be used for respectively erectting the division board (4) that the storage space that sets up the curb plate (2) inside wall and bottom plate (3) upper surface encloses to establish and forms becomes different storage area.

14. The storage cassette of claim 11, wherein: the storage box further comprises top plates (5) covered in the space enclosed by the vertical side plates (2), and four corners of each top plate (5) are movably supported on supporting flanges (17) of the corner connecting pieces (1) respectively.

15. The storage box according to claim 14, wherein: wherein a pair of perpendicular curb plate (2) top of putting that are in the relative position is equipped with and link up and corresponds to erect arc recess (22) between the curb plate (2) inside and outside lateral wall of putting, the notch setting of arc recess (22) is corresponding to erect the upper surface of putting curb plate (2) and undercut to being less than the below of roof (5) position to make and to take out roof (5) upwards through this arc recess (22).

16. The storage box according to claim 14, wherein: the upper surface of support flange (17) is equipped with from upper surface undercut constant head tank (18) to the bottom of roof (5) is equipped with the convex positioning body that just can cooperate the installation downwards with corresponding constant head tank (18) in the position corresponding with constant head tank (18).

17. The storage box according to claim 13, wherein: erect and be equipped with the position adjacent with division board (4) on the inside wall of putting curb plate (2) and be convenient for division board (4) side edge male and erect and put sharp slot (23), erect the lower extreme and horizontal sharp slot (21) intercommunication of putting sharp slot (23).