Cement undercut self-tapping anchor bolt

Abstract

The utility model relates to the technical field of self-tapping anchor bolts, and discloses a cement undercut self-tapping anchor bolt which comprises an anchor rod and a regular hexagon boss fixedly installed at one end of the anchor rod, first spiral teeth are distributed on the outer side of the anchor rod, and a full outward protruding part is fixedly installed at the end, close to the regular hexagon boss, of each first spiral tooth. Short spiral teeth are further arranged on the outer side of the end, close to the regular hexagon boss, of the anchor rod, and the full outer protruding part is of an annular structure. According to the cement undercut self-tapping anchor bolt, when the double-thread anchor bolt is used, the first spiral teeth and the short spiral teeth are in double engagement, are matched with the full-outward-protruding part and are firmly locked in cement, when the three-thread anchor bolt is used, the first spiral teeth, the second spiral teeth and the short spiral teeth achieve triple engagement, and are combined with the half-outward-protruding part to achieve quadruple engagement, loosening is effectively prevented, and meanwhile the anchor bolt can be firmly locked in cement. The V-shaped spiral cutting groove can reduce screwing-in friction force and facilitate cutting-in, the inwards-concave part at the end of the screw head enhances the drilling-in effect, the overall structure is reasonable, and practicability is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to self -drilling anchor bolt technical field, concretely is cement cut bottom self -drilling anchor bolt. BACKGROUND

[0002] Anchors are devices used to secure objects to base materials such as concrete, masonry, rock, etc. They are usually made of metal and have threads or other special designs that allow them to safely connect or anchor objects, providing firm support and fixation. Double-threaded anchors are a special type of anchoring anchor, commonly used to connect elements in structures, especially in construction and civil engineering.

[0003] Chinese utility model patent publication number: CN210660952U, discloses: a hexagonal flange concrete threaded self-cut anchor bolt, the hexagonal flange concrete threaded self-cut anchor bolt, through the setting sharp self-cut anchor tail structure, can not need auxiliary processing, can directly drill hole, tapping and locking on concrete component, but, because the anchor bolt does not set anchor structure, lead to the bite, the adhesion ability between it and the hole position is seriously insufficient, under the action of severe environment such as vibration, impact, cannot form stable mechanical locking, prone to loose and fall off. UTILITY MODEL CONTENT

[0004] (I) technical problem solved

[0005] In view of the deficiencies of the prior art, the utility model provides a cement cut bottom self -drilling anchor bolt to solve the problems raised in the above background.

[0006] (II) technical scheme

[0007] In order to achieve the above object, the utility model provides the following technical scheme: cement cut bottom self -drilling anchor bolt, including anchor rod, and the hexagonal boss fixedly installed at one end of anchor rod, the outer side of anchor rod is distributed with first helical tooth, the one end fixedly installed with full external protrusion of first helical tooth close to hexagonal boss, the outer side of anchor rod close to hexagonal boss one end still is provided with short helical tooth, the full external protrusion is circular ring structure, first helical tooth and full external protrusion are integrally formed.

[0008] Through the above technical scheme, in the process of using, through the double bite of first helical tooth and short helical tooth, and the matching full external protrusion, can be locked in cement tightly, can effectively avoid that anchor bolt separates from cement.

[0009] Preferably, a screw head is fixedly installed at the end of the anchor rod away from the regular hexagonal boss, and a second helical tooth is provided on the outer side of the anchor rod. Cutting grooves are provided on the outer sides of the first helical tooth, the second helical tooth, and the short helical tooth. A semi-outer protrusion is fixedly installed at the end of the first helical tooth and the second helical tooth near the regular hexagonal boss. An inner concave portion is provided diagonally at the end of the screw head away from the regular hexagonal boss. A regular hexagonal recess is also provided at the end of the regular hexagonal boss away from the anchor rod. The cross-section of the semi-outer protrusion is a six-quarter circular annular structure. The semi-outer protrusion, the first helical tooth, and the second helical tooth are all integrally formed.

[0010] Preferably, the cross-sections of the first helical teeth and the second helical teeth are both serrated, the first helical teeth and the second helical teeth are arranged in parallel, the first helical teeth and the second helical teeth do not interfere with each other, and the first helical teeth and the second helical teeth have the same structure.

[0011] Preferably, the number of the semi-protrusions is twice that of the anchor rod, the semi-protrusions are symmetrically distributed about the vertical center line of the anchor rod, and the angles between the semi-protrusions and the first helical tooth, and between the semi-protrusions and the second helical tooth are all 120°.

[0012] Through the above technical solution, in the process of using cement-cut self-tapping anchors, the design of the first and second helical teeth can achieve a double thread engagement state. At the same time, the semi-outer protrusions located on the upper part of the first and second helical teeth can also be embedded in the cement, which can further enhance the engagement ability.

[0013] Preferably, the cutting groove has a "V" shaped cross-section, and the cutting groove is spirally distributed on the outside of the first helical tooth, the second helical tooth and the short helical tooth, with an included angle of 30° between two adjacent cutting grooves.

[0014] The above technical solution, through the design of the spirally distributed cutting grooves in a "V" shape, can effectively reduce the screwing friction and facilitate the insertion of the anchor bolt.

[0015] Preferably, the short helical tooth is located between the first helical tooth and the second helical tooth, and the short helical tooth is parallel to both the first and second helical teeth. The length of the short helical tooth is one-fifth of that of the first and second helical teeth.

[0016] Through the above technical solution, the design of short helical teeth between the first and second helical teeth can achieve triple engagement between the anchor bolt and the cement, which can further improve its engagement ability and prevent it from loosening.

[0017] Preferably, the hexagonal recess is located at the center of the top of the hexagonal boss, and the center line of the hexagonal recess and the center line of the hexagonal boss are on the same vertical line.

[0018] The above technical solution, with its hexagonal recessed design, allows for screwing in using either a hexagonal socket or an internal hex wrench, making the anchor bolt easy to operate with various tools.

[0019] Preferably, the top of the screw head has a "∩" shaped structure, and the concave portion is symmetrically distributed around the center line of the screw head.

[0020] The above technical solution, through the design of the concave portion, allows for better insertion into the cement.

[0021] Compared with the prior art, this utility model provides a cement-cut self-tapping anchor bolt, which has the following beneficial effects:

[0022] 1. This cement-cutting self-tapping anchor, when using a double-threaded anchor, can be tightly locked in the cement through the double engagement of the first helical tooth and the short helical tooth, and with the full external protrusion, effectively preventing the anchor from coming out of the cement.

[0023] 2. This cement-cutting self-tapping anchor, when using a triple-threaded anchor, achieves triple engagement through the first helical tooth, the second helical tooth, the semi-outer protrusion, and the short helical tooth. Combined with the semi-outer protrusion, it achieves quadruple engagement, effectively preventing the anchor from loosening during use. The design of the "V"-shaped spiral cutting groove and the concave part at the end of the thread head effectively reduces the screwing friction and facilitates the anchor's insertion. The concave part at the end of the thread head allows for better cutting into the cement. The overall design is reasonable and convenient to use. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the double-threaded anchor bolt of this utility model. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the double-threaded anchor bolt of this utility model. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the three-dimensional structure of the three-threaded anchor bolt of this utility model. Figure 1 ;

[0027] Figure 4 This is a schematic diagram of the three-dimensional structure of the three-threaded anchor bolt of this utility model. Figure 2 ;

[0028] Figure 5 This is a schematic diagram of the three-dimensional structure of the three-threaded anchor bolt of this utility model. Figure 3 ;

[0029] Figure 6This is a schematic diagram of the half-section structure of the present invention. Figure 1 ;

[0030] Figure 7 This is a schematic diagram of the half-section structure of the present invention. Figure 2 ;

[0031] Figure 8 This is a schematic diagram of the distribution structure of the first and second helical teeth of this utility model.

[0032] Among them: 1. Regular hexagonal boss; 2. Anchor rod; 3. First helical tooth; 4. Semi-outer protrusion; 5. Second helical tooth; 6. Short helical tooth; 7. Screw head end; 8. Inner recess; 9. Cutting groove; 10. Regular hexagonal recess; 11. Fully outer protrusion. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1:

[0035] like Figures 1-8 As shown, the cement-cut-bottom self-tapping anchor provided by this utility model includes an anchor rod 2 and a regular hexagonal boss 1 fixedly installed at one end of the anchor rod 2. The outer side of the anchor rod 2 is provided with first helical teeth 3. A fully external protrusion 11 is fixedly installed at one end of the first helical teeth 3 near the regular hexagonal boss 1. Short helical teeth 6 are also provided on the outer side of the anchor rod 2 near the regular hexagonal boss 1. The fully external protrusion 11 has a circular ring structure. The first helical teeth 3 and the fully external protrusion 11 are integrally formed.

[0036] The advantage is that during use, the double engagement of the first helical tooth 3 and the short helical tooth 6, along with the full external protrusion 11, can tightly lock the anchor bolt in the cement, effectively preventing it from coming off the cement.

[0037] Example 2:

[0038] like Figures 2-8 As shown, as an improvement on the previous embodiment, the anchor bolt's anti-loosening capability is further enhanced.

[0039] Specifically, a screw head end 7 is fixedly installed at the end of the anchor rod 2 away from the regular hexagonal boss 1. A second helical tooth 5 is provided on the outer side of the anchor rod 2. Cutting grooves 9 are opened on the outer sides of the first helical tooth 3, the second helical tooth 5 and the short helical tooth 6. A semi-outer protrusion 4 is fixedly installed at the end of the first helical tooth 3 and the second helical tooth 5 near the regular hexagonal boss 1. An inner concave part 8 is opened diagonally at the end of the screw head end 7 away from the regular hexagonal boss 1. A regular hexagonal recess 10 is also opened at the end of the regular hexagonal boss 1 away from the anchor rod 2. The cross-section of the semi-outer protrusion 4 is a six-sixth circular annular structure. The semi-outer protrusion 4, the first helical tooth 3 and the second helical tooth 5 are all integrally formed.

[0040] Specifically, both the first helical tooth 3 and the second helical tooth 5 have a serrated cross-section. The first helical tooth 3 and the second helical tooth 5 are arranged in parallel and do not interfere with each other. The first helical tooth 3 and the second helical tooth 5 have identical structures. The number of semi-protruding portions 4 is twice that of the anchor rod 2. The semi-protruding portions 4 are symmetrically distributed about the vertical centerline of the anchor rod 2. The angles between the semi-protruding portions 4 and the first helical tooth 3, and between the semi-protruding portions 4 and the second helical tooth 5, are both 120°. The advantage is that, during the use of cement-cut self-tapping anchors, the design of the first helical tooth 3 and the second helical tooth 5 enables a double-threaded engagement. Simultaneously, the semi-protruding portions 4 located on the upper part of the first helical tooth 3 and the second helical tooth 5 can also be embedded in the cement, further enhancing the engagement capability.

[0041] Specifically, the short helical tooth 6 is located between the first helical tooth 3 and the second helical tooth 5, and the short helical tooth 6 is parallel to both the first helical tooth 3 and the second helical tooth 5. The length of the short helical tooth 6 is one-fifth of the length of the first helical tooth 3 and the second helical tooth 5. The advantage is that the design of the short helical tooth 6 between the first helical tooth 3 and the second helical tooth 5 enables triple engagement between the anchor bolt and the cement, further enhancing its engagement ability and preventing loosening.

[0042] Example 3:

[0043] like Figures 2-8 As shown, as an improvement to Embodiment 1 and Embodiment 2, the anchor bolts are screwed in more easily.

[0044] Specifically, the cutting groove 9 has a "V" shaped cross-section and is spirally distributed on the outside of the first helical tooth 3, the second helical tooth 5, and the short helical tooth 6. The included angle between two adjacent cutting grooves 9 is 30°. The advantage is that the spiral distribution of the cutting groove 9 in a "V" shape can effectively reduce the screwing friction and facilitate the insertion of the anchor bolt.

[0045] Specifically, the tip of the screw head 7 adopts a "∩" shaped structure, and the concave portions 8 are symmetrically distributed around the center line of the screw head tip 7. The advantage is that the design of the concave portions 8 allows for better cutting into the cement.

[0046] Example 4:

[0047] like Figures 2-8 As shown, as an improvement to Embodiment 1, Embodiment 2 and Embodiment 3, in order to adapt to the twisting of various tools.

[0048] Specifically, the hexagonal recess 10 is located at the center of the top of the hexagonal boss 1, and the centerline of the hexagonal recess 10 and the centerline of the hexagonal boss 1 are on the same vertical line. The advantage is that the design of the hexagonal recess 10 allows for screwing in using either a hexagonal socket or an Allen wrench, making it convenient to use as the anchor bolt can be tightened with various tools.

[0049] Working principle: When using double-threaded anchors, the operator selects a hexagonal socket to screw the anchor in. The first helical tooth 3 cuts into the cement. Through the double engagement of the first helical tooth 3 and the short helical tooth 6, and with the full external protrusion 11, it can be tightly locked in the cement, effectively preventing the anchor from coming out of the cement. When using triple-threaded anchors, the operator can select a hexagonal socket or an Allen wrench to screw in the anchor according to the actual situation. During the screwing process, the design of the "V"-shaped spiral distribution cutting groove 9 can effectively reduce the screwing friction and facilitate the cutting of the anchor. When the entire anchor is screwed into the reserved hole, the semi-external protrusion 4 located at the rear end of the first helical tooth 3 and the second helical tooth 5 can be stuck into the cement. With the cooperation of the short helical tooth 6, quadruple locking can be achieved, which can effectively prevent the anchor from loosening.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cement-cut self-tapping anchor, comprising an anchor rod (2) and a regular hexagonal boss (1) fixedly installed at one end of the anchor rod (2), characterized in that: The anchor rod (2) has a first helical tooth (3) distributed on its outer side. The first helical tooth (3) is fixedly installed with a full external protrusion (11) at one end near the regular hexagonal boss (1). The anchor rod (2) is also provided with a short helical tooth (6) on its outer side near the regular hexagonal boss (1). The full external protrusion (11) has a circular ring structure. The first helical tooth (3) and the full external protrusion (11) are integrally formed.

2. The cement-cut self-tapping anchor bolt according to claim 1, characterized in that: The anchor rod (2) is fixedly installed with a screw head end (7) at the end away from the regular hexagonal boss (1). The anchor rod (2) is provided with a second helical tooth (5) on the outside. The first helical tooth (3), the second helical tooth (5) and the short helical tooth (6) are all provided with cutting grooves (9) on the outside. The first helical tooth (3) and the second helical tooth (5) are fixedly installed with a semi-outer protrusion (4) at the end near the regular hexagonal boss (1). The screw head end (7) is provided with a concave part (8) diagonally at the end away from the regular hexagonal boss (1). The regular hexagonal boss (1) is also provided with a regular hexagonal recess (10) at the end away from the anchor rod (2). The cross section of the semi-outer protrusion (4) is a six-sixth circular annular structure. The semi-outer protrusion (4) is integrally formed with the first helical tooth (3) and the second helical tooth (5).

3. The cement-cut self-tapping anchor bolt according to claim 2, characterized in that: The cross-sections of the first helical tooth (3) and the second helical tooth (5) are both serrated. The first helical tooth (3) and the second helical tooth (5) are arranged in parallel. The first helical tooth (3) and the second helical tooth (5) do not interfere with each other. The first helical tooth (3) and the second helical tooth (5) have the same structure.

4. The cement-cut self-tapping anchor bolt according to claim 2, characterized in that: The number of the semi-protruding parts (4) is twice that of the anchor rod (2). The semi-protruding parts (4) are symmetrically distributed about the vertical center line of the anchor rod (2). The angle between the semi-protruding parts (4) and the first helical tooth (3) and the semi-protruding parts (4) and the second helical tooth (5) is 120°.

5. The cement-cut self-tapping anchor bolt according to claim 2, characterized in that: The cutting groove (9) has a "V" shaped cross section. The cutting groove (9) is spirally distributed on the outside of the first helical tooth (3), the second helical tooth (5) and the short helical tooth (6). The included angle between two adjacent cutting grooves (9) is 30°.

6. The cement-cut self-tapping anchor according to claim 2, characterized in that: The short helical tooth (6) is located between the first helical tooth (3) and the second helical tooth (5), and the short helical tooth (6) is parallel to the first helical tooth (3) and the second helical tooth (5). The length of the short helical tooth (6) is one-fifth of that of the first helical tooth (3) and the second helical tooth (5).

7. The cement-cut self-tapping anchor bolt according to claim 2, characterized in that: The regular hexagonal recess (10) is located at the center of the top of the regular hexagonal boss (1), and the center line of the regular hexagonal recess (10) and the center line of the regular hexagonal boss (1) are on the same vertical line.

8. The cement-cut-bottom self-tapping anchor according to claim 2, characterized in that: The top of the screw head end (7) adopts a "∩" shaped structure, and the concave part (8) is symmetrically distributed around the center line of the screw head end (7).

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