Floor lock catch unit

Abstract

The utility model relates to a floor lock catch unit which comprises a tenon tongue end face and a mortise end face which are oppositely arranged and located on two adjacent connected floor blocks respectively, and each floor block is provided with an upper surface and a paving contact face. The tenon tongue end face and the mortise end face are spliced in a male-female mode to form a floor lock catch unit; the tenon end face is provided with at least one tenon concave part used for splicing and a tenon deformation part, the contact face back groove is formed beside the tenon deformation part so that the tenon deformation part can be stressed and deformed, and an opening of the contact face back groove faces the paving covering object of the floor lock catch unit. The mortise end face is provided with at least one mortise convex part which corresponds to the tenon concave part and can extrude the tenon deformation part to deform so as to be assembled. The floor lock catch unit is convenient to assemble and good in lock catch quality.

Description

Technical Field

[0001] The utility model relates to the field of flooring, in particular to a floor locking unit used for splicing and installing adjacent floorboards. Background Art

[0002] Currently, flooring lock systems are the primary method for connecting floor surfaces. Their fastening strength and assembly method have always been paramount factors affecting product quality and manufacturing costs in the flooring industry. Traditional flooring with mortise and tenon joints often struggles to balance lock strength with ease of assembly. Furthermore, due to their limited maximum elastic deformation, traditional locks often perform poorly in humid and other adverse environments, prone to warping and noise.

[0003] In order to solve the problem of "it is difficult to strike a balance between locking quality and assembly method", designing a locking system with a large elastic deformation range and the ability to specifically provide appropriate reaction force for various deformation conditions of the floor has become a difficult problem that the current flooring industry urgently needs to overcome.

[0004] To address this problem, existing technologies have incorporated a back groove into the tongue's convex portion to introduce elastic deformation. However, due to the small size of the tongue's convex portion in actual production and the uneven force distribution associated with curved surface machining, this technology places high demands on the precision of floor cutting tools and production lines. This results in high production costs and poor performance in actual use, making it difficult to cope with complex environmental conditions. This production technology has limited application in the floor lock industry and has not been widely adopted in actual production. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a floor locking unit which is easy to assemble and has good locking quality.

[0006] The technical solution to achieve the purpose of the present invention is to provide a floor locking unit, including two connecting end surfaces that are respectively located on two adjacent connected floor panels and are arranged opposite to each other and can be male-female spliced. Any of the connecting end surfaces is provided with a contact surface back groove for extrusion and deformation for male-female splicing during splicing, and the notch of the contact surface back groove directly faces the paving and covering object of the floor locking unit.

[0007] Furthermore, the floor locking unit comprises a tongue end surface and a groove end surface respectively located on two adjacently connected floorboards and arranged opposite to each other, wherein each of the floorboards has an upper surface and a paving contact surface;

[0008] The tongue end face and the groove end face are connected by male and female joints to form a floor locking unit; the tongue end face has at least one tongue recess for connection, a tongue deformation portion, and a contact surface back groove provided beside the tongue deformation portion to enable the tongue deformation portion to deform under force;

[0009] The end surface of the mortise and tenon groove has at least one mortise and tenon groove protrusion corresponding to the mortise and tenon tongue concave portion and capable of squeezing the mortise and tenon tongue deforming portion to deform for assembly;

[0010] The tenon concave portion of the tenon tongue end face is sleeved on the outer periphery of the corresponding tenon groove convex portion of the tenon groove end face.

[0011] Furthermore, the tenon tongue end surface includes a tenon tongue convex portion, a tenon tongue concave portion, a tenon tongue deformation portion and a contact surface back groove distributed from the outer upper portion to the inner lower portion;

[0012] The end surface of the mortise and tenon groove includes a mortise and tenon groove lower lip, a mortise and tenon groove convex portion and a mortise and tenon groove concave portion distributed from the outer lower portion to the inner upper portion;

[0013] The tongue end face of one floorboard is sleeved by its tongue concave part on the periphery of the mortise convex part of the mortise end face of the female part of another floorboard, and the tongue convex part is inserted into the mortise concave part.

[0014] Furthermore, the tenon and tongue protrusion includes a tenon and tongue upper lip, a tenon and tongue protrusion first contact surface, a tenon and tongue protrusion first transition surface, a tenon and tongue protrusion second contact surface and a tenon and tongue protrusion second transition surface. The tenon and tongue upper lip located at the outermost upper part is perpendicular to the pavement contact surface, and a recessed tenon and tongue protrusion first contact surface is provided below it. A protrusion protruding outward is provided below the tenon and tongue protrusion first contact surface, and the protrusion has a tenon and tongue protrusion first transition surface extending inward and downward. The tenon and tongue protrusion first transition surface is inwardly connected to the tenon and tongue protrusion second contact surface, and the tail end of the tenon and tongue protrusion second contact surface is connected to the tenon and tongue protrusion second transition surface extending inward and upward.

[0015] The tongue recess includes a first contact surface, a first transition surface, a second transition surface, and a second contact surface. The first contact surface is connected to the upper and inner portion of the second transition surface of the convex tongue portion. The first contact surface is connected inwardly to the downwardly inclined first transition surface. The first transition surface is connected inwardly to the curved second transition surface. The outwardly convex second contact surface is connected below the second transition surface.

[0016] The tongue deformation portion is located below and inside the second contact surface of the tongue recess. Its longitudinal cross-section is in the shape of an inverted trapezoid. The side where the tongue deformation portion connects to the second contact surface of the tongue recess is the tongue lower lip. A gap is formed between the lower end surface of the tongue deformation portion and the pavement contact surface.

[0017] The contact surface back groove is arranged on the inner side of the tenon-tongue deformation portion.

[0018] Furthermore, the end surface of the mortise includes a mortise lower lip, a mortise convex portion, and a mortise concave portion distributed from the outermost lower portion to the innermost upper portion. The mortise lower lip located at the outermost lower portion is perpendicular to the pavement contact surface. The mortise lower lip and the pavement contact surface transition through an inwardly inclined inclined surface, so that the pavement contact surface is retracted into the mortise lower lip. The upper portion of the mortise lower lip is connected to an outwardly protruding mortise convex portion. The mortise convex portion corresponds to the shape of the tenon tongue concave portion, so that the mortise convex portion includes a corresponding mortise convex portion second contact surface, a mortise convex portion second transition surface, a mortise convex portion first transition surface, and a mortise convex portion first contact surface. The mortise concave portion includes a shape corresponding to the tenon tongue convex portion, so that the mortise concave portion includes a mortise concave portion second transition surface, a mortise concave portion second contact surface, a mortise concave portion first transition surface, a mortise concave portion first contact surface, and a mortise upper lip. The mortise upper lip located at the innermost upper portion is perpendicular to the pavement contact surface.

[0019] Furthermore, the upper lip of the tenon tongue and the upper lip of the tenon groove are in contact with each other, the convex part of the tenon tongue is sunken into the concave part of the tenon groove, and the convex part of the tenon groove is sunken into the concave part of the tenon tongue. There are four contact surfaces at the end face joint, among which: the second contact surface of the longer convex part of the tenon tongue and the second contact surface of the concave part of the tenon groove are approximately horizontal to the paving contact surface; the first contact surface of the convex part of the tenon tongue and the first contact surface of the concave part of the tenon groove are in contact with each other, the first contact surface of the concave part of the tenon tongue and the first contact surface of the concave part of the tenon groove are in contact with each other, and the second contact surface of the concave part of the tenon tongue and the second contact surface of the convex part of the tenon groove are in contact with each other.

[0020] Furthermore, a chamfer with a higher outside and a lower inside is provided between the pavement contact surface and the lower lip of the mortise and tenon, and a chamfer with a higher outside and a lower inside is provided on the lower end surface of the deformed portion of the mortise and tenon tongue.

[0021] The present invention has positive effects: (1) The floor locking unit of the present invention is suitable for boards with a thickness of 3 mm to 18 mm and a certain elasticity. The boards can be placed on the ground or on a variety of cushioning materials. The upper surface of the board can include a variety of patch decorations, including imitation wood grain and imitation stone. The patch decoration can be made in any known way. In particular, the tool required for the locking system can be applied to any currently known floor manufacturing line, without the need to add additional production lines.

[0022] (2) The floor lock unit of the present invention introduces a large elastic deformation and tension into the lock structure by cutting a back groove on the floor contact surface. The deformation and internal stress can specifically provide appropriate reaction force for various deformation conditions of the floor, so that the connection between the floor panels is reliable in strength and can cope with various adverse working environments, greatly reducing the probability of warping and abnormal noise.

[0023] (3) The tongue end face and the groove end face of the floor lock unit of the present invention can be customized and adjusted when facing different working environments, such as humid environments, thicker boards and low-elastic materials.

[0024] (4) The floor lock unit of the present invention has at least three installation methods, including but not limited to the straight assembly method of applying a force perpendicular to the ground to the end of the tenon after the upper lip of the tenon tongue and the upper lip of the tenon groove are pressed against each other; the horizontal assembly method of applying a force horizontal to the ground to the board after the end face of the tenon tongue and the end face of the tenon groove are placed horizontally; the oblique assembly method of placing the end face of the tenon tongue at a certain angle to the end face of the tenon groove and then inserting and assembling them obliquely, etc.

[0025] (5) The floor locking unit of the present invention is suitable for a variety of assembly methods, including but not limited to straight laying, herringbone assembly, herringbone assembly, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of a floor locking unit of the present utility model;

[0027] Figure 2 for Figure 1 A schematic structural diagram of the tongue end surface in FIG.

[0028] Figure 3 for Figure 1 Structural schematic diagram of the mortise and tenon end face;

[0029] Figure 4 This is a schematic diagram of the assembly process of a floor lock unit of the present invention;

[0030] Figure 5 This is a structural diagram of the floor locking unit in Example 2;

[0031] Figure 6 This is a structural diagram of the floor locking unit in Example 3.

[0032] The markings in the above figures are as follows: upper surface 1, pavement contact surface 2,

[0033] Tongue end surface 3, tongue protrusion 30, tongue upper lip 301, tongue protrusion first contact surface 302, tongue protrusion first transition surface 303, tongue protrusion second contact surface 304, tongue protrusion second transition surface 305, tongue recess 3 1. The first contact surface 311 of the tongue recess, the first transition surface 312 of the tongue recess, the second transition surface 313 of the tongue recess, the second contact surface 314 of the tongue recess, the deformation part 32 of the tongue, the lower lip 321 of the tongue, the back groove 33 of the contact surface,

[0034] Tenon end face 4, tenon recess 40, tenon recess second transition surface 405, tenon recess second contact surface 404, tenon recess first transition surface 403, tenon recess first contact surface 402, tenon upper lip 401, tenon convex part 41, tenon convex part second contact surface 414, tenon convex part second transition surface 413, tenon convex part first transition surface 412, tenon convex part first contact surface 411, tenon lower lip 42. DETAILED DESCRIPTION

[0035] (Example 1)

[0036] See Figures 1 to 3 The floor locking unit of this embodiment includes a tongue end face 3 and a groove end face 4 which are respectively arranged opposite to each other on two adjacent connected floor panels. The floor panels all have an upper surface 1 and a paving contact surface 2. The upper surface 1 is arranged parallel to the paving contact surface 2. The paving contact surface 2 is the contact surface of the floor panel covering the installation object such as the ground paving surface or the wall paving surface. The tongue end face 3 and the groove end face 4 can implement a male-female connection when splicing, wherein the tongue end face 3 is the male part and the groove end face 4 is the female part; the tongue end face 3 is located at a certain side connection surface of the first floor panel, and the groove end face 4 is located at the corresponding side connection surface of the second floor panel to be connected with the aforementioned first floor panel. For example, for a rectangular floor panel, it is the two side faces of the two floor panels which are opposite to each other. For a hexagonal floor panel, it is one of the six side faces of the first floor panel and one of the six side faces of the second floor panel to be connected. For special-shaped floor panels, the tongue end face 3 and the groove end face 4 are also located at the corresponding opposite sides to be spliced.

[0037] The tongue end surface 3 includes a tongue protrusion 30, a tongue recess 31, a tongue deformation portion 32 and a contact surface back groove 33 distributed from the outside to the inside. The tongue protrusion 30 includes a tongue upper lip 301, a tongue protrusion first contact surface 302, a tongue protrusion first transition surface 303, a tongue protrusion second contact surface 304 and a tongue protrusion second transition surface 305. The tongue upper lip 301 located at the outermost top is perpendicular to the pavement contact surface 4, and a recessed tongue protrusion first contact surface 302 is provided below it. A convex portion protruding outward is provided below the tongue protrusion first contact surface 302, and the convex portion has a tongue protrusion first transition surface 303 extending inward and downward. The tongue protrusion first transition surface 303 is inwardly connected to the tongue protrusion second contact surface 304, and the tail end of the tongue protrusion second contact surface 304 is connected to the tongue protrusion second transition surface 305 extending inward and upward.

[0038] The tongue recess 31 includes a tongue recess first contact surface 311, a tongue recess first transition surface 312, a tongue recess second transition surface 313, and a tongue recess second contact surface 314. The tongue recess first contact surface 311 is connected to the upper and inner portion of the tongue protrusion second transition surface 305. The tongue recess first contact surface 311 is connected inwardly to the downwardly inclined tongue recess first transition surface 312. The tongue recess first transition surface 312 is connected inwardly to the curved tongue recess second transition surface 313. The tongue recess second transition surface 313 is connected below the outwardly convex tongue recess second contact surface 314.

[0039] The tongue-deformation portion 32 is located below and inside the second contact surface 314 of the tongue recess. Its longitudinal cross-section is an inverted trapezoidal shape. The side where the tongue-deformation portion 32 connects to the second contact surface 314 is the tongue lower lip 321. A gap exists between the lower end of the tongue-deformation portion 32 and the pavement contact surface 2 to prevent compression during deformation.

[0040] The contact surface back groove 33 is arranged on the inner side of the tenon deformation part 32, and the groove opening of the contact surface back groove 33 directly faces the paving covering object of the floor locking unit, such as the ground and the wall, so that the tenon deformation part 32 can deform inward, so that the axial front and rear ends of the contact surface back groove 33 are also open and run through the entire length of the tenon end face 3 in this direction.

[0041] The mortise end face 4 includes a mortise lower lip 42, a mortise protrusion 41 and a mortise recess 40 distributed from the outermost bottom to the innermost top. The mortise lower lip 42 located at the outermost bottom is perpendicular to the pavement contact surface 4. The mortise lower lip 42 and the pavement contact surface 4 are transitioned by an inwardly inclined inclined surface so that the pavement contact surface 4 is retracted into the mortise lower lip 42. The mortise protrusion 41 protruding outward is connected to the upper side of the mortise lower lip 42. The mortise protrusion 41 corresponds to the shape of the tenon tongue recess 31, so that the mortise protrusion 41 includes the corresponding mortise protrusion second contact surface 414, the mortise protrusion second transition surface 413, the mortise protrusion first transition surface 412 and the mortise protrusion first contact surface 411. The mortise and tenon recess 40 includes a shape corresponding to the tenon tongue protrusion 30, so that the mortise and tenon recess 40 includes a mortise and tenon recess second transition surface 405, a mortise and tenon recess second contact surface tenon 404, a mortise and tenon recess first transition surface 403, a mortise and tenon recess first contact surface 402 and a mortise and tenon upper lip 401, and the mortise and tenon upper lip 401 located at the innermost upper part is perpendicular to the pavement contact surface 4.

[0042] The tongue end face 3 and the groove end face 4 of this embodiment are arranged opposite to each other to implement cooperative splicing. After being spliced ​​into a floor lock unit, the tongue end face 3 of one floorboard, which serves as the male part, is sleeved by its tongue recess 31 on the outer periphery of the groove protrusion 41 of the groove end face 4 of the female part of the other floorboard. The tongue protrusion 30 is inserted into the groove concave 40, that is, the tongue upper lip 301 abuts against the groove upper lip 401, the tongue protrusion 30 sinks into the groove concave 40, and the groove protrusion 41 sinks into the tongue concave 31. There are four contact surfaces at the end face splicing. Specifically, the longer second contact surface 304 of the tongue protrusion and the second contact surface 404 of the groove concave are approximately parallel to the pavement contact surface 2, thereby preventing the locking structure from loosening in a direction perpendicular to the upper surface 1. The contact between the first contact surface 302 of the tongue protrusion and the first contact surface 402 of the groove concave, the contact between the first contact surface 311 of the tongue concave and the first contact surface 411 of the groove concave, and the contact between the second contact surface 314 of the tongue concave and the second contact surface 414 of the groove protrusion prevents the locking unit from loosening in a direction parallel to the pavement contact surface 2. Therefore, when the floor locking unit is assembled and installed, the contact surface back groove 33 provides a large threshold of elastic deformation space for the structure. Therefore, when the floor locking unit is subjected to an external force that is detrimental to the structural fit, the tongue deformation portion 32 will specifically deform, preventing loosening parallel to and perpendicular to the upper surface 1 of the floor locking unit, thereby ensuring the strength and stability of the floor locking unit under various external forces. When the floor locking unit is perfectly spliced ​​and matched, the contact surface back groove 33 and the tongue and groove end surface 4 do not undergo elastic deformation, and the floor locking unit will not be in a fatigue state due to long-term internal stress.

[0043] The floor locking unit is suitable for boards with a thickness between 3mm and 18mm and exhibiting a certain degree of elasticity. The floorboards can be placed on the ground or on a variety of cushioning materials. The upper surface 1 of the floorboards can be decorated with a variety of decorative patches, including imitation wood grain and stone. These decorative patches can be manufactured using any known method.

[0044] See Figure 4 When the floor locking unit of this embodiment is spliced, due to the arrangement of the tongue deformation portion 32 and the contact surface back groove 33, the splicing can be carried out in three ways: the first floorboard with the tongue end face 3 is vertically embedded in the second floorboard with the groove end face 4 from above, or the first floorboard with the tongue end face 3 is horizontally inserted into the second floorboard with the groove end face 4 from the side, or the first floorboard with the tongue end face 3 is inserted obliquely from the side and screwed downwardly into the second floorboard with the groove end face 4. In this process, the tongue deformation portion 32 can be deformed from a stress-free state to a stress-extrusion deformation state into the contact surface back groove 33, and then elastically recovers to a stress-free state, thereby completing the splicing. Figure 1, the back groove 33 of the contact surface can specifically provide corresponding reaction force for various deformation conditions of the floor blocks caused by external force or external environment, so that the floor blocks are not loose in the direction orthogonal to and horizontal to the laying contact surface.

[0045] It should be noted that the floor locking unit of the present application will be appropriately modified in various use environments in actual production. Under the rule of following the technical core, i.e. the contact surface back groove 33 provides specific reaction force, the appearance of the contact surface back groove 33, the tongue end surface 3 and the tongue groove end surface 4 can all be changed, and embodiment 1 is only one recommended implementation case.

[0046] Embodiment 2

[0047] See Figure 5 Recommended implementation case modification one: the stepped structure near the tongue convex portion first contact surface 302 is simplified, and the included angle between the tongue convex portion first contact surface 302 and the orthogonal direction of the laying contact surface 2 is reduced. The above modification can improve the stability of the floor locking unit in the horizontal direction while reducing the orthogonal external force applied to the tongue end surface 3 during vertical assembly.

[0048] Embodiment 3

[0049] See Figure 6 Recommended implementation case modification two: a chamfer is introduced at the tongue groove lower lip 42 of the tongue groove end surface 4, which makes the range of tension and elastic deformation larger in actual use, and is more suitable for humid environments and low-elasticity plate materials.

[0050] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not a limitation on the embodiments of the present application. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to exhaust all the embodiments. These obvious changes or variations derived from the spirit of the present application are still within the protection scope of the present application.

Claims

1. A floor locking unit, characterized in that: It includes two connecting end surfaces that are respectively located on two adjacent connected floor blocks and are arranged opposite to each other and can be male-female spliced. Any of the connecting end surfaces is provided with a contact surface back groove for extrusion and deformation for male-female splicing during splicing. The notch of the contact surface back groove directly faces the paving covering object of the floor locking unit.

2. A floor locking unit according to claim 1, characterized in that: The floorboards comprise a tongue end surface and a groove end surface respectively located on two adjacently connected floorboards and arranged opposite to each other, wherein each of the floorboards has an upper surface and a paving contact surface; The tongue end face and the groove end face are connected by male and female joints to form a floor locking unit; the tongue end face has at least one tongue recess for connection, a tongue deformation portion, and a contact surface back groove provided beside the tongue deformation portion to enable the tongue deformation portion to deform under force; The end surface of the mortise and tenon groove has at least one mortise and tenon groove protrusion corresponding to the mortise and tenon tongue concave portion and capable of squeezing the mortise and tenon tongue deforming portion to deform for assembly; The tenon concave portion of the tenon tongue end face is sleeved on the outer periphery of the corresponding tenon groove convex portion of the tenon groove end face.

3. A floor locking unit according to claim 2, characterized in that: The end surface of the tenon tongue includes a tenon tongue convex portion, a tenon tongue concave portion, a tenon tongue deformation portion and a contact surface back groove distributed from the outer upper portion to the inner lower portion; The end surface of the mortise and tenon groove includes a mortise and tenon groove lower lip, a mortise and tenon groove convex portion and a mortise and tenon groove concave portion distributed from the outer lower portion to the inner upper portion; The tongue end face of one floorboard is sleeved by its tongue concave part on the periphery of the mortise convex part of the mortise end face of the female part of another floorboard, and the tongue convex part is inserted into the mortise concave part.

4. A floor locking unit according to claim 3, characterized in that: The tongue convex portion comprises a tongue upper lip, a tongue convex portion first contact surface, a tongue convex portion first transition surface, a tongue convex portion second contact surface and a tongue convex portion second transition surface, wherein the tongue upper lip located at the outermost upper portion is perpendicular to the pavement contact surface, and a recessed tongue convex portion first contact surface is provided below the tongue convex portion, and a convex portion protruding outward is provided below the tongue convex portion first contact surface, the convex portion having a tongue convex portion first transition surface extending inwardly and downwardly, the tongue convex portion first transition surface is inwardly connected to the tongue convex portion second contact surface, and a rear end of the tongue convex portion second contact surface is connected to the tongue convex portion second transition surface extending inwardly and upwardly; The tongue recess includes a first contact surface of the tongue recess, a first transition surface of the tongue recess, a second transition surface of the tongue recess and a second contact surface of the tongue recess; The first contact surface of the tongue recess is connected to the upper inner portion of the second transition surface of the tongue protrusion. The first contact surface of the tongue recess is connected inwardly to the downwardly inclined first transition surface of the tongue recess. The first transition surface of the tongue recess is connected inwardly to the arcuate second transition surface of the tongue recess. The lower portion of the second transition surface of the tongue recess is connected to the outwardly convex second contact surface of the tongue recess. The tongue deformation portion is arranged below and inside the second contact surface of the tongue recess, and its longitudinal section is in the shape of an inverted trapezoid, and the side surface where the tongue deformation portion connects with the second contact surface of the tongue recess is the tongue lower lip; There is a gap between the lower end surface of the deformed portion of the tongue and the pavement contact surface; The contact surface back groove is arranged on the inner side of the tenon-tongue deformation portion.

5. The floor locking unit according to claim 4, characterized in that: The end surface of the mortise and tenon groove includes a mortise and tenon groove lower lip, a mortise and tenon groove convex portion, and a mortise and tenon groove concave portion, which are distributed from the outermost lower portion to the innermost upper portion. The mortise and tenon groove lower lip is perpendicular to the pavement contact surface. The mortise and tenon groove lower lip and the pavement contact surface are transitioned by an inwardly inclined inclined surface, so that the pavement contact surface is retracted into the mortise and tenon groove lower lip. The mortise and tenon groove convex portion protruding outward is connected to the upper portion of the mortise and tenon groove lower lip. The mortise and tenon groove convex portion corresponds to the shape of the tenon tongue concave portion, so that the mortise and tenon groove convex portion includes a corresponding mortise and tenon groove convex portion second contact surface, a mortise and tenon groove convex portion second transition surface, a mortise and tenon groove convex portion first transition surface, and a mortise and tenon groove convex portion first contact surface. The mortise and tenon recess includes a shape corresponding to the tenon tongue protrusion, so that the mortise and tenon recess includes the mortise and tenon recess second transition surface, the mortise and tenon recess second contact surface tenon, the mortise and tenon recess first transition surface, the mortise and tenon recess first contact surface and the mortise upper lip, and the mortise upper lip located at the innermost upper part is perpendicular to the pavement contact surface.

6. The floor locking unit according to claim 5, characterized in that: The upper lip of the tenon tongue and the upper lip of the tenon groove are against each other, the convex part of the tenon tongue is sunken into the concave part of the tenon groove, and the convex part of the tenon groove is sunken into the concave part of the tenon tongue. There are four contact surfaces at the end face joint, among which: the longer second contact surface of the convex part of the tenon tongue and the second contact surface of the concave part of the tenon groove are approximately horizontal to the paving contact surface; the first contact surface of the convex part of the tenon tongue and the first contact surface of the concave part of the tenon groove are in contact with each other, the first contact surface of the concave part of the tenon tongue and the first contact surface of the concave part of the tenon groove are in contact with each other, and the second contact surface of the concave part of the tenon tongue and the second contact surface of the convex part of the tenon groove are in contact with each other.

7. The floor locking unit according to claim 5, characterized in that: A chamfer with a higher outside and a lower inside is set between the pavement contact surface and the lower lip of the mortise and tenon, and a chamfer with a higher outside and a lower inside is set on the lower end surface of the deformed portion of the mortise and tenon tongue.

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