CN110966292A

CN110966292A - Hidden connecting mechanism

Info

Publication number: CN110966292A
Application number: CN201811148144.6A
Authority: CN
Inventors: 彭志军
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-09-29
Filing date: 2018-09-29
Publication date: 2020-04-07

Abstract

The invention relates to a hidden connecting mechanism, which comprises a first scarf joint body and a connecting rod, wherein the first scarf joint body comprises a first embedded block, a first fastening block and a first fastening screw, the first embedded block is provided with a first concave groove, a first guide inclined plane and an insertion hole, the wall of the insertion hole is provided with a first barb part, the first fastening block is arranged in the first concave groove, the inner wall of the first fastening block is tightly attached to the first guide inclined plane, the first fastening screw is arranged on the first penetrating hole in a penetrating mode and is in threaded connection with the first fastening block, one end of the connecting rod is provided with a second barb part, one end of the connecting rod is inserted into the insertion hole, and the second barb part is hooked on the first barb part. This coupling mechanism utilizes the inflation fixed to realize fixedly with barb formula locking structure and is connected, and fastness and reliability are very high, can not appear returning the pine, drop, the phenomenon of fracture, and this coupling mechanism application back is hidden between the work piece moreover, and not showing now is outside, and then does not influence the surperficial clean and tidy and pleasing to the eye of product.

Description

Hidden connecting mechanism

Technical Field

The invention relates to the field of assembly and connection between workpieces, in particular to a connecting mechanism for assembling and connecting the workpieces.

Background

At present, the assembly, connection and fixation between workpieces basically adopt the following modes: screw or bolt-nut connection, glue bonding connection and mortise and tenon type connection. For example, a wood workpiece and a wood workpiece are fixedly connected by a self-tapping screw, so that the phenomena of burst, loosening and loose connection at the connection position often occur, and the screw is exposed outside, so that the tidiness and the attractiveness of the product are influenced; or, the wood workpiece and the wood workpiece are connected by adopting the mortise and tenon joint, and although the problem that the screw is exposed at present is solved, the connection reliability is poor, and the phenomena of loosening and cracking are easy to occur. For another example, a metal workpiece or a plastic workpiece is fixedly connected by bolts and nuts, and although the connection is firm, the positions of the bolt heads and the nuts or the bolt holes and the nut holes are usually exposed outside, which affects the tidiness and beauty of the product; and two tools are usually needed for two-end operation, so that the assembly and connection efficiency is low. For another example, the workpieces are also bonded and connected by glue, the connection reliability is feasible when the glue is not aged, but the glue is easy to age after being used for a long time, and the workpieces are easy to fall off, loosen and unreliable in connection.

Therefore, in the present stage, the assembly connection between the workpieces has more defects: the connection is not firm, the back loosening and the cracking are easy to occur, the neat and beautiful appearance of the product is affected, the service life is short, and the like. Therefore, the applicant believes that it is necessary to develop a new connecting mechanism which is hidden, reliable and firm in connection, free from affecting the neat and beautiful appearance of the product and long in service life, so as to meet the requirements of connecting and assembling workpieces of various products.

Disclosure of Invention

The invention aims to solve the problems and the defects, and provides a hidden connecting mechanism which realizes fixation and connection by utilizing an expansion fixation and barb type locking structure, has high firmness and reliability, and can not generate the phenomena of loosening, falling off and cracking; and has the advantages of simple structure, convenient and fast assembly, strong applicability, wide application range and the like.

The technical scheme of the invention is realized as follows: a hidden connecting mechanism is characterized by comprising a first scarf joint body and a connecting rod, wherein the first scarf joint body comprises a first embedded block, a first fastening block and a first fastening screw, a first concave groove is formed in the side face of the first embedded block, a first guide inclined plane is arranged at the bottom of the first concave groove, a first penetrating hole penetrating through the first concave groove is formed in the top of the first embedded block, an insertion hole is further formed in the top of the first embedded block, a plurality of first barb parts are arranged on the wall of the insertion hole, the first barb parts are arranged side by side along the length direction of the center line of the insertion hole, the first fastening block is arranged in the first concave groove, a first anti-skidding concave-convex part is arranged on the outer wall of the first fastening block, the inner wall of the first fastening block is tightly attached to the first guide inclined plane, the first penetrating hole is arranged on the first penetrating hole, and a first threaded rod is in threaded connection with the first fastening block, the first limiting head is positioned at the top of the first embedded block, so that the first fastening block moves towards the outer side of the notch of the first concave groove under the guidance of the first guide inclined plane when the first fastening screw is screwed; a plurality of second barb parts are arranged on the outer wall of one end of the connecting rod, the second barb parts are matched with the first barb parts, the second barb parts are arranged side by side along the length direction of the connecting rod, one end of the connecting rod is inserted into the insertion hole, and the second barb parts are hooked on the first barb parts; the second barb part and the first barb part are arranged in opposite directions.

In order to further improve the reliability and the convenience of the connection between the other end of the connecting rod and a workpiece, a plurality of third barb parts are also arranged on the outer wall of the other end of the connecting rod, and the third barb parts are arranged side by side along the length direction of the connecting rod.

In order to further improve the applicability of the hidden connecting mechanism, the hidden connecting mechanism further comprises a second scarf joint body, the second scarf joint body comprises a second embedded block, a second fastening block and a second fastening screw, a second concave groove is formed in the side face of the second embedded block, a second guide inclined plane is arranged at the bottom of the second concave groove, a second penetrating hole penetrating through the second concave groove is formed in the bottom of the second embedded block, the second fastening block is arranged in the second concave groove, a second anti-skidding concave-convex part is arranged on the outer wall of the second fastening block, the inner wall of the second fastening block is tightly attached to the second guide inclined plane, the second fastening screw is composed of a second limiting head and a second threaded rod, one end of the second threaded rod is connected to the second limiting head, the diameter of the second limiting head is larger than that of the second penetrating hole, and the diameter of the second threaded rod is smaller than that of the second penetrating hole, the second threaded rod is arranged on the second penetrating hole in a penetrating mode, the second threaded rod is in threaded connection with the second fastening block, and the second limiting head is located at the bottom of the second embedded block so that the second fastening block can move towards the outer side of the notch of the second concave groove under the guiding direction of the second guiding inclined plane when the second fastening screw is screwed; the other end of the connecting rod is fixed at the bottom of the second embedded block.

In order to further improve the convenience of inserting the connecting rod, the first barb part is replaced by an elastic limiting block, and the elastic limiting block is embedded between the two second barb parts.

For the convenience of further improvement connecting rod installation, be equipped with the stationary blade on the connecting rod other end tip, be equipped with at least one perforation on the stationary blade.

In order to further improve the convenience and the reliability of the installation and the fixation of the connecting rod, the outer wall of the other end of the connecting rod is provided with an external thread.

In order to further improve the reliability of the installation and positioning of the first embedded block, a third anti-skidding concave-convex part is also arranged on the outer wall of the first embedded block.

In order to facilitate the hiding of the first set screw and reduce the processing difficulty of a workpiece, the first penetrating hole is composed of a large hole and a small hole, the large hole is formed in the top of the first embedded block, the small hole is formed in the bottom of the large hole and penetrates the small hole to the first concave groove, the first limiting head is arranged in the large hole, the diameter of the first limiting head is larger than that of the small hole, and the diameter of the first threaded rod is smaller than that of the small hole.

In order to further improve the stability and reliability of the movement of the first fastening block, a contact inclined plane is arranged on the inner wall of the first fastening block, and the contact inclined plane is tightly attached to the first guide inclined plane.

The invention has the beneficial effects that: (1) by adopting the nested expansion fixing mechanism consisting of the first embedded block, the first fastening screw, the first concave groove and the first guide inclined plane, the inserting hole with the barb part arranged on the first embedded block and the structure with the reverse barb part designed on the connecting rod, when in use, firstly, one of the two workpieces is provided with an installation hole, the expansion fixing mechanism is embedded in the hole, and tightened by the first fastening screw to make the first embedded block and the first fastening block expand tightly in the hole, in addition, the expansion fixing mode converts the locking force of the first set screw rotating around the vertical direction into the expansion force expanding transversely, realizes the steering of the fixing force, furthermore, the expansion fixing mechanism can be prevented from loosening or being infirm in tightening, and the firmness and reliability of tightening in the mounting hole can be effectively guaranteed; one end of the connecting rod is fixedly connected with the other workpiece of the two workpieces, the other end of the connecting rod is inserted into the insertion hole of the first embedded block, the barb part in the insertion hole and the reverse barb part on the connecting rod are mutually meshed together to achieve the purpose of locking, and the barb part in the insertion hole and the barb part on the connecting rod are in a structural design with opposite directions, so that the connecting rod cannot exit once inserted into the insertion hole, and the connecting rod can be inserted more and more tightly, and the inserting is more and more firm, so that the phenomena of loosening and falling cannot occur. (2) After the connecting mechanism is adopted to connect two workpieces, the whole connecting mechanism is completely hidden in the two workpieces, no part is exposed outside, and therefore the connection concealment can be effectively ensured, and the cleanness and the attractiveness of the surface of a product cannot be influenced. (3) The expansion fixing mechanism and the connecting rod are directly connected in an assembling mode in a plug-in mode, special tools are not needed, and the assembly is rapid, convenient and efficient. (4) The mechanism can be widely applied to the assembly connection among wood workpieces, metal workpieces and nonmetal workpieces, also can be applied to the assembly connection between the wood workpieces and the metal workpieces, or the assembly connection between the nonmetal workpieces and the metal workpieces, or the assembly connection between the wood workpieces and the nonmetal workpieces, and has the advantages of simple structure, convenient and quick assembly, strong applicability, wide application range and the like.

Drawings

Fig. 1 is a schematic perspective view of a first embodiment of the present invention.

FIG. 2 is a schematic view of a split structure of the first embodiment of the present invention.

Fig. 3 is an enlarged schematic view of a portion a of fig. 2 according to the present invention.

Fig. 4 is a schematic structural diagram of a first design scheme of the first insert block in the invention.

Fig. 5 is a schematic structural diagram of a first fastening block in the present invention.

Fig. 6 is a schematic structural diagram of a first design scheme of the connecting rod in the invention.

FIG. 7 is a schematic sectional view of the second embodiment of the present invention.

FIG. 8 is a schematic view of the split structure of scheme two in the present invention.

Fig. 9 is a schematic structural view of a second embodiment of the first insert block of the present invention.

Fig. 10 is a schematic structural view of a second design of the connecting rod of the present invention.

Fig. 11 is a schematic perspective view of a third embodiment of the present invention.

Fig. 12 is a schematic structural view of a third design of the connecting rod of the present invention.

Fig. 13 is a schematic structural view of a fourth design of the connecting rod of the present invention.

Fig. 14 is a schematic perspective view of a fourth embodiment of the present invention.

FIG. 15 is a schematic view of the split structure of scheme four in the present invention.

FIG. 16 is a schematic view of an exploded view of the hidden connecting mechanism of the present invention.

FIG. 17 is a second exploded view of the hidden connecting mechanism of the present invention.

Detailed Description

As shown in fig. 1, the hidden connecting mechanism of the present invention comprises a first scarf body 1 and a connecting rod 2, wherein, as shown in fig. 2 and 4, the first scarf body 1 comprises a first embedded block 11, a first fastening block 12 and a first fastening screw 13; as shown in fig. 2 and 4, a first recessed groove 111 is formed in a side surface of the first insert block 11, a first guide inclined surface 112 is formed at a bottom of the first recessed groove 111, a first penetrating hole 113 penetrating through the first recessed groove 111 is formed at a top of the first insert block 11, an insertion hole 114 is further formed at the top of the first insert block 11, a plurality of first barb portions 115 are formed on a hole wall of the insertion hole 114, and the first barb portions 115 are arranged side by side along a length direction of a center line of the insertion hole 114; as shown in fig. 2 and 5, the first fastening block 12 is disposed in the first recessed groove 111, a first anti-slip concave-convex part 121 is provided on an outer wall of the first fastening block 12, and an inner wall of the first fastening block 12 is closely attached to the first guide slope 112; as shown in fig. 1 and 2, the first set screw 13 is composed of a first limiting head 131 and a first threaded rod 132, one end of the first threaded rod 132 is connected to the first limiting head 131, the diameter of the first limiting head 131 is larger than that of the first penetrating hole 113, and the diameter of the first threaded rod 132 is smaller than that of the first penetrating hole 113; as shown in fig. 1 and 2, the first threaded rod 132 is inserted into the first insertion hole 113, the first threaded rod 132 is screwed with the first fastening block 12, and the first limiting head 131 is located on the top of the first embedded block 11, so that when the first fastening screw 13 is screwed, the first fastening block 12 moves to the outside of the notch of the first recessed groove 111 under the guidance of the first guiding inclined plane 112; as shown in fig. 2 and 6, a plurality of second barb portions 21 are arranged on the outer wall of one end of the connecting rod 2, the second barb portions 21 are matched with the first barb portions 115, and the second barb portions 21 are arranged side by side along the length direction of the connecting rod 2; as shown in fig. 1 and 2, one end of the connecting rod 2 is inserted into the insertion hole 114, and the second barb 21 is hooked on the first barb 115, and the second barb 21 is disposed opposite to the first barb 115. Since the concealed connecting mechanism includes the first engagement element 1 and the connecting rod 2, and the first fastening block 12 can be moved to the outside of the notch of the first concave groove 111 under the guidance of the first guiding inclined surface 112 by screwing the first fastening screw 13 on the first engagement element 1, the first engagement element 1 can be expanded and fixed, and the fixing mode is very firm. Because the connecting rod 2 is provided with the second barb parts 21, the insertion hole 114 of the first insertion block 11 is provided with the first barb parts 115, and the first barb parts 115 are matched with the second barb parts 21, after the connecting rod 2 is inserted into the insertion hole 114, the first barb parts 115 and the second barb parts 21 interact with each other, so that the connecting rod 2 can be effectively prevented from loosening, the connecting mode is very firm, and the reliability of the hidden connecting mechanism is very high. Through set up first anti-skidding concave-convex part 121 on first tight fixed block 12, can further increase the reliability of first tight fixed block 12 installation location to can improve the fastness and the reliability of first scarf joint body 1 installation fixing effectively, avoid first scarf joint body 1 the condition that becomes flexible to appear droing. Because the hidden connecting mechanism can realize expansion fixation, the hidden connecting mechanism can be suitable for workpieces formed by sectional materials, wood and the like, and the hidden connecting mechanism has strong applicability. Because the hidden connecting mechanism adopts a combined structure of the connecting rod 2 and the first scarf body 1, and the first scarf body 1 can be installed in an embedding mode, the first scarf body 1 can be hidden well after being embedded and fixed; in addition, the connecting rod 2 is inserted into the insertion hole 114 of the first insert block 11, so that the connecting rod 2 can be hidden, and the aesthetic property and the grade of connection between workpieces can be prevented from being influenced.

The side surface and the top of the first embedded block 11 do not limit the use of the first embedded block 11, but the relative position relationship of each part on the first embedded block 11 when the first embedded block 11 is in the state shown in the drawing does not limit the state of the first embedded block 11 when being installed and used, and the first embedded block 11 can be turned for use when being used.

The first set screw 13 is a slotted socket cap screw, a slotted pan head screw, a slotted countersunk head screw, an inner hexagonal socket head cap screw, an inner hexagonal flat round head screw or an inner hexagonal countersunk head screw.

The farther a point on the first guide slope 112 is from the opening of the first penetration hole 113, the farther it is from the center line of the first penetration hole 113; thus, when the first holding block 12 gets closer to the first penetration hole 113, it moves outward of the opening of the first recess groove 111 under the guidance of the first guide slope 112.

The connecting rod 2 and the second barb part 21 on the connecting rod are made of plastic or rubber with certain elasticity; so that the connecting rod 2 can be inserted into the insertion hole 114 and a good connection is achieved. The first embedded block 11 and the first fastening block 12 can be made of plastic, rubber or metal.

When the hidden connecting mechanism is used for connecting two workpieces, the first scarf joint body 1 and the connecting rod 2 are respectively arranged on the butt joint surfaces of the two workpieces; specifically, the method comprises the following steps: embedding the first scarf body 1 on one workpiece and adopting expansion locking, wherein the other end of the connecting rod 2 is fixed on the other workpiece; then, by inserting one end of the connector link 2 into the insertion hole 114, the second barb portion 21 can be hooked onto the first barb portion 115 at the same time, which enables the connector link 2 to be connected to the first scarf body 1, so that two workpieces can be reliably connected together, which also enables the concealed connecting mechanism to be well concealed between the two workpieces, which contributes to improving the aesthetics and the grade of the connection between the workpieces.

On the basis of the above, in order to further improve the reliability and convenience of connecting the other end of the connecting rod with the workpiece, as shown in fig. 11 and 12, the outer wall of the other end of the connecting rod 2 is also provided with a plurality of third barb portions 22, and the third barb portions 22 are arranged side by side along the length direction of the connecting rod 2. When a workpiece is manufactured, a hole for inserting the other end of the connecting rod 2 can be formed in the workpiece, a plurality of barb parts are arranged on the hole wall of the inserting hole 114, the barb parts are matched with the third barb parts 22, and the barb parts are arranged side by side along the length direction of the center line of the inserting hole. By providing the third barb portion 22 at the other end of the connecting rod 2 in this way, the reliability and convenience of connection between the other end of the connecting rod 2 and the corresponding workpiece can be improved. As shown in fig. 13, a plurality of second barbs 21 may be respectively formed at both ends of the connecting rod 2; when the connecting rod 2 is provided with the second barb portions 21 at both ends, the connecting rod 2 can be inserted into the insertion holes 114 of the two first engagement bodies 1, respectively, so that the expansion fixation can be achieved at both ends of the connecting rod 2.

As shown in fig. 2, 3, 6, 10, 12 and 13, the first barb 115, the second barb 21 and the third barb 22 have trapezoidal or triangular cross sections. As shown in fig. 2 and 3, two surfaces of the first barb 115 opposite to each other are respectively provided with a first guiding inclined surface 103 and a first limiting surface 104, the first guiding inclined surface 103 is arranged in a staggered manner with respect to a center line of the insertion hole 114, and the first limiting surface 104 is perpendicular to the center line of the insertion hole 114. As shown in fig. 6, two surfaces of the second barb portion 21 opposite to each other are respectively provided with a second guiding inclined surface 201 and a second limiting surface 202, the second guiding inclined surfaces 201 are arranged in a staggered manner with respect to the center line of the connecting rod 2, and the second limiting surface 202 is perpendicular to the center line of the connecting rod 2. The third barb part 22 is a convex ring structure, and the end faces of the two ends of the third barb part 22 are respectively provided with a third guide inclined plane and a third limiting plane, the third guide inclined plane and the central line of the connecting rod 2 are arranged in a staggered manner, and the third limiting plane is perpendicular to the central line of the connecting rod 2.

In addition to the above, in order to further improve the applicability of the concealed connecting mechanism, as shown in fig. 14 and 15, the concealed connecting mechanism further includes a second engagement body 3, the second engagement body 3 includes a second insertion block 31, a second fastening block 32, and a second fastening screw 33, a second recessed groove 311 is formed on a side surface of the second insertion block 31, a second guide inclined surface 312 is formed on a groove bottom of the second recessed groove 311, a second insertion hole 313 penetrating through the second recessed groove 311 is formed on a bottom of the second insertion block 31, the second fastening block 32 is disposed in the second recessed groove 311, a second anti-slip concave-convex portion 321 is formed on an outer wall of the second fastening block 32, an inner wall of the second fastening block 32 is tightly attached to the second guide inclined surface 312, the second fastening screw 33 is composed of a second limiting head 331 and a second threaded rod 332, one end of the second threaded rod 332 is connected to the second threaded rod limiting head 331, the diameter of the second limiting head 331 is larger than that of the second penetrating hole 313, the diameter of the second threaded rod 332 is smaller than that of the second penetrating hole 313, the second threaded rod 332 penetrates through the second penetrating hole 313, the second threaded rod 332 is in threaded connection with the second fastening block 32, and the second limiting head 331 is positioned at the bottom of the second embedded block 31, so that when the second fastening screw 33 is screwed, the second fastening block 32 moves towards the outer side of the notch of the second recessed groove 311 under the guide of the second guide inclined plane 312; the other end of the connecting rod 2 is fixed at the bottom of the second embedded block 31. The first scarf body 1 and the second scarf body 3 can be installed on a workpiece in an embedded mode; thus, when the concealed connecting mechanism is used, the first scarf joint body 1 and the second scarf joint body 3 can be respectively embedded on two workpieces to be connected and locked, and then the connecting rod 2 is inserted into the insertion hole 114, so that the two workpieces can be connected together quickly and effectively, the connection reliability is high, and the concealed connecting mechanism is beneficial to further improving the applicability. The connecting rod 1 can be fixed on the second embedded block 31 by welding or bonding, or the connecting rod 1 and the second embedded block 31 are integrally formed.

The side surface and the bottom of the second embedded block 31 do not limit the use of the second embedded block 31, but the relative position relationship of the parts on the second embedded block 31 is not limited by the state of installing and using the second embedded block 31 when the second embedded block 31 is in the state shown in the drawing, and the second embedded block 31 can be used in a reversed direction when being used.

The second fitting block 31, the second fastening block 32, and the second fastening screw 33 may be assembled in the same manner as the second fitting block 31, the first fastening block 12, and the first fastening screw 13.

The second set screw 33 is a slotted socket cap screw, a slotted pan head screw, a slotted countersunk head screw, an inner hexagonal socket head cap screw, an inner hexagonal flat round head screw or an inner hexagonal countersunk head screw.

The further the point on the second guide slope 312 from the opening of the second penetration hole 313, the further it is from the center line of the second penetration hole 313; thus, when the second holding block 32 gets closer to the second passing hole 313, it moves outward of the notch of the second concave slot 311 under the guidance of the second guide slope 312.

In addition to the above, in order to further improve the convenience of inserting the connecting rod, as shown in fig. 7 to 9, the first barb portion 115 is replaced by an elastic stopper 116, and the elastic stopper 116 is inserted between the two second barb portions 21. Through the setting of elastic limiting block 116, the convenience of connecting rod 2 cartridge and the reliability of connecting rod 2 installation location can be improved. As shown in fig. 7, 8 and 10, when the elastic limiting block 116 is adopted, the second barb 21 may be made into a convex ring structure, and an inclined surface appears on an end surface of the second barb 21, so that the second barb 21 can smoothly enter the first penetrating hole 113 and cooperate with the elastic limiting block 116.

As shown in fig. 8 and 9, the elastic limiting stopper 116 is in a short strip structure, and the elastic limiting stopper 116 is disposed in an inclined manner with respect to the inner wall of the insertion hole 114, so that one end of the elastic limiting stopper 116 is fixed on the inner wall of the insertion hole 114.

In addition to the above, in order to further improve the convenience of installing the tie bar, as shown in fig. 1 and 2, a fixing plate 23 is provided on the other end portion of the tie bar 2, and at least one through hole 231 is provided on the fixing plate 23. By providing the fixing plate 23 and providing the fixing plate 23 with the through hole 231, the fixing of the connecting rod 2 can be facilitated by locking the fixing plate 23 to the workpiece through the through hole 231 with a screw.

On the basis of the above, in order to further improve the convenience and reliability of the installation and fixation of the connecting rod, as shown in fig. 6 and 10, an external thread 24 is provided on the outer wall of the other end of the connecting rod 2. Through the setting of external screw thread 24, accessible external screw thread 24 directly fixes connecting rod 2 on the work piece, helps improving connecting rod 2 installation fixed convenience and reliability. The external threads 24 may be attached to a thicker workpiece.

In the actual manufacturing process, the connecting rod can adopt the following structure: a limiting convex ring is arranged at the other end of the connecting rod 2; before the connecting rod 2 is used, through holes can be formed in workpieces to be connected; when the connecting rod 2 is used, the connecting rod 2 can be arranged on the through hole in a penetrating mode, the limiting convex ring is tightly pressed at the hole opening of the through hole, and therefore the connecting rod 2 and a workpiece needing to be connected can be assembled. The through hole can adopt a counter bore, and the limiting convex ring is positioned in the counter bore, so that the limiting convex part and the connecting rod 2 can be prevented from protruding out of the surface to be connected, and the attractiveness and the grade of the workpiece can be guaranteed.

In addition to the above, in order to further improve the reliability of the mounting and positioning of the first insert block, as shown in fig. 2 to 4 and 7 to 9, the third uneven part 14 is also provided on the outer wall of the first insert block 11. By providing the third anti-slip concave-convex portion 14, the reliability of the mounting and positioning of the first embedded block 11 can be improved, which contributes to the improvement of the reliability of the connection between the workpieces.

On the basis of the above, in order to facilitate the hiding of the first set screw and reduce the processing difficulty of the workpiece, as shown in fig. 2, 7 and 8, the first insertion hole 113 is composed of a large hole 101 and a small hole 102, the large hole 101 is opened at the top of the first embedded block 11, the small hole 102 is opened at the bottom of the large hole 101, and the small hole 102 penetrates through the first recessed groove 111, the first stopper 131 is arranged in the large hole 101, the diameter of the first stopper 131 is larger than that of the small hole 102, and the diameter of the first threaded rod 132 is smaller than that of the small hole 102. Through the structural design, the first threaded rod 132 is convenient to hide on the first embedded block 11, so that when the first embedded block 11 is embedded on a workpiece, the first fastening screw 13 can be prevented from protruding out of the workpiece, and a cavity groove for the first fastening screw 13 to hide is not required to be formed in another workpiece connected with the first fastening screw 13, so that the processing difficulty of the workpiece is reduced.

In order to further improve the stability and reliability of the movement of the first fastening block, as shown in fig. 1, 2 and 5, a contact inclined surface 122 is provided on the inner wall of the first fastening block 12, and the contact inclined surface 122 is closely attached to the first guide inclined surface 112. By arranging the contact slope 122 and making the contact slope 122 cling to the first guide slope 112, the stability and reliability of the movement of the first fastening block 12 can be improved.

As shown in fig. 14 and 15, the first insert block 11 may be formed in a cylindrical structure, and the first fastening block 12 may be formed in a fan-shaped structure. The first embedded block 11 and the first fastening block 12 may also adopt the following structures: the first embedded block 11 can also be made into a rectangular structure, and the first fastening block 12 can be made into a trapezoidal structure.

As shown in fig. 11, first recessed grooves 111 may be formed in two opposite outer surfaces of the first insert block 11, first insertion holes 113 penetrating through the first recessed grooves 111 may be formed in the top of the first insert block 11, first fastening blocks 12 may be disposed in the two first recessed grooves 111, and finally first fastening screws 13 may be inserted in the two first insertion holes 113, and the first fastening screws 13 may be screwed to the corresponding first fastening blocks 12. In this way, when the two fastening screws 13 are tightened, the two first fastening blocks 12 can be moved to both sides of the first insert block 11. When the first insert part 11 is inserted into a cavity in a workpiece, an effective fixing action is achieved by the two first fastening blocks 12, so that the first insert part 1 is firmly fixed to the workpiece.

As shown in fig. 16, when the hidden connection mechanism is required for connecting the thin plate 100 with other workpieces 200, the upper cylinder 200 can be installed on the surface of the plate 100, and the first embedded block 11 is embedded in the inner hole of the cylinder 200 and locked; then the second scarf body 3 is embedded on the workpiece 200 and locked; finally, the connecting rod 2 connected to the second engagement element 3 is inserted into the insertion hole 114 of the first engagement block 11, and the second barb 21 is hooked on the first barb 115, so that the workpiece 200 and the plate material 100 can be efficiently connected together. In the actual assembly process, the work 200 and the plate material 100 can be efficiently connected also by directly fixing the other end of the connecting rod 2 to the work 200 without using the second engagement body 3, inserting the connecting rod 2 into the insertion hole 114 of the first engagement block 11, and hooking the second barb 21 to the first barb 115.

As shown in fig. 17, when the hidden connection mechanism is required to connect two thick plates 100, two embedding grooves 110 may be formed on the surfaces of the two plates 100, and then the first scarf joint 1 and the second scarf joint 3 are embedded in the embedding grooves 110 of the two plates 100 and locked; finally, the two plate materials 100 can be efficiently joined together by inserting the connecting rod 2 connected to the second engagement element 3 into the insertion hole 114 of the first engagement block 11 and hooking the second barb 21 to the first barb 115. In the actual assembly process, the first engagement element 1 may be engaged in the engagement groove 110 of one of the plate materials 100 without using the second engagement element 3, and the other end of the connecting rod 2 may be directly fixed to the other plate material 100, and then the connecting rod 2 may be inserted into the insertion hole 114 of the first engagement block 11 and the second barb 21 may be hooked on the first barb 115, and the two plate materials 100 may be effectively connected together as well.

Claims

1. The utility model provides a hidden coupling mechanism which characterized in that: comprises a first scarf body (1) and a connecting rod (2), wherein the first scarf body (1) comprises a first embedded block (11), a first fastening block (12) and a first fastening screw (13), wherein

A first concave groove (111) is formed in the side face of the first embedded block (11), a first guide inclined plane (112) is arranged at the bottom of the first concave groove (111), a first penetrating hole (113) penetrating through the first concave groove (111) is formed in the top of the first embedded block (11), an insertion hole (114) is further formed in the top of the first embedded block (11), a plurality of first barb parts (115) are arranged on the wall of the insertion hole (114), and the first barb parts (115) are arranged side by side along the length direction of the center line of the insertion hole (114);

the first fastening block (12) is arranged in a first concave groove (111), a first anti-skid concave-convex part (121) is arranged on the outer wall of the first fastening block (12), and the inner wall of the first fastening block (12) is tightly attached to a first guide inclined surface (112);

the first threaded rod (132) is arranged on the first penetrating hole (113) in a penetrating mode, the first threaded rod (132) is in threaded connection with the first fastening block (12), and the first limiting head (131) is located at the top of the first embedded block (11) so that when the first fastening screw (13) is screwed, the first fastening block (12) moves towards the outer side of the notch of the first recessed groove (111) under the guiding of the first guide inclined plane (112);

a plurality of second barb parts (21) are arranged on the outer wall of one end of the connecting rod (2), the second barb parts (21) are matched with the first barb parts (115), the second barb parts (21) are arranged side by side along the length direction of the connecting rod (2), one end of the connecting rod (2) is inserted into the insertion hole (114), and the second barb parts (21) are hooked on the first barb parts (115); the second barb part (21) and the first barb part (115) are arranged in opposite directions.

2. The concealed connection mechanism according to claim 1, wherein: and a plurality of third barb parts (22) are also arranged on the outer wall of the other end of the connecting rod (2), and the third barb parts (22) are arranged side by side along the length direction of the connecting rod (2).

3. The concealed connection mechanism according to claim 1, wherein: the novel plastic pipe fitting is characterized by further comprising a second scarf body (3), wherein the second scarf body (3) comprises a second scarf block (31), a second fastening block (32) and a second fastening screw (33), and the second scarf block (31), the second fastening block and the second fastening screw are arranged in sequence

A second concave groove (311) is formed in the side face of the second embedded block (31), a second guide inclined plane (312) is arranged at the bottom of the second concave groove (311), and a second penetrating hole (313) penetrating through the second concave groove (311) is formed in the bottom of the second embedded block (31);

the second fastening block (32) is arranged in a second concave groove (311), a second anti-skid concave-convex part (321) is arranged on the outer wall of the second fastening block (32), and the inner wall of the second fastening block (32) is tightly attached to a second guide inclined surface (312);

the second set screw (33) is composed of a second limiting head (331) and a second threaded rod (332), one end of the second threaded rod (332) is connected to the second limiting head (331), the diameter of the second limiting head (331) is larger than that of the second penetrating hole (313), and the diameter of the second threaded rod (332) is smaller than that of the second penetrating hole (313);

the second threaded rod (332) is arranged on the second penetrating hole (313) in a penetrating mode, the second threaded rod (332) is in threaded connection with the second fastening block (32), and the second limiting head (331) is located at the bottom of the second embedded block (31) so that when the second fastening screw (33) is screwed, the second fastening block (32) moves towards the outer side of the notch of the second recessed groove (311) under the guiding of the second guiding inclined plane (312);

the other end of the connecting rod (2) is fixed at the bottom of the second embedded block (31).

4. The concealed connecting mechanism according to claim 1, 2 or 3, wherein: the first barb part (115) is replaced by an elastic limiting block (116), and the elastic limiting block (116) is embedded between the two second barb parts (21).

5. The concealed connection mechanism according to claim 1, wherein: the connecting rod (2) is provided with a fixing plate (23) at the other end of the connecting rod, and the fixing plate (23) is provided with at least one through hole (231).

6. The concealed connection mechanism according to claim 1, wherein: and an external thread (24) is arranged on the outer wall of the other end of the connecting rod (2).

7. The concealed connection mechanism according to claim 1, wherein: and a third anti-skidding concave-convex part (14) is also arranged on the outer wall of the first embedded block (11).

8. The concealed connection mechanism according to claim 1, wherein: the first penetrating hole (113) is composed of a large hole (101) and a small hole (102), the large hole (101) is formed in the top of the first embedded block (11), the small hole (102) is formed in the bottom of the large hole (101), the small hole (102) penetrates through the first recessed groove (111), the first limiting head (131) is arranged in the large hole (101), the diameter of the first limiting head (131) is larger than that of the small hole (102), and the diameter of the first threaded rod (132) is smaller than that of the small hole (102).

9. The concealed connection mechanism according to claim 1, wherein: the inner wall of the first fastening block (12) is provided with a contact inclined surface (122), and the contact inclined surface (122) is tightly attached to the first guide inclined surface (112).

10. The concealed connection mechanism according to claim 1, wherein: the first set screw (13) is composed of a first limiting head (131) and a first threaded rod (132), one end of the first threaded rod (132) is connected to the first limiting head (131), the diameter of the first limiting head (131) is larger than that of the first penetrating hole (113), and the diameter of the first threaded rod (132) is smaller than that of the first penetrating hole (113).