CN209925385U - Novel self-cutting bottom anchor bolt - Google Patents
Novel self-cutting bottom anchor bolt Download PDFInfo
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- CN209925385U CN209925385U CN201920513987.5U CN201920513987U CN209925385U CN 209925385 U CN209925385 U CN 209925385U CN 201920513987 U CN201920513987 U CN 201920513987U CN 209925385 U CN209925385 U CN 209925385U
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Abstract
The utility model provides a novel self-undercut crab-bolt, which is characterized in that the self-undercut crab-bolt comprises a screw rod, an expansion sheet, a nut and a flat pad, wherein the screw rod comprises a screw head, a screw part, a first cylindrical part, a second cylindrical part, a third cylindrical part, a circular table part, a screw tail and a spherical surface part which are sequentially connected from front to back; the utility model has the advantages that: when the self-cutting tool bit cuts a concrete hole, the self-locking key can firmly clamp the conical groove along with the increase of the torque, and the self-locking tool bit is stable and reliable; the expansion piece middle part is equipped with expansion round hole and expansion power bump, and expansion round hole and expansion power bump are crisscross along circumference and are set up, reduce the stress of expansion piece when rotatory cutting.
Description
Technical Field
The utility model relates to a building installation engineering field especially relates to a novel self-cutting end anchor bolt.
Background
The existing self-undercut anchor bolt in the market consists of a sleeve self-undercut head, an auxiliary sleeve, a screw rod, a flat gasket and a nut, wherein the screw rod is formed by cold heading, and the sleeve self-undercut head and the auxiliary sleeve are machined by a sleeve raw material lathe. Such a design has the following disadvantages: the material consumption is large, and the waste product is large; the volume is large, and the cost for transporting materials is high; automatic production cannot be realized, and the productivity is low; the material removing processing is adopted, the material crystal lattice is damaged, and the fatigue strength is poor: the installation speed is slow, and the installation cost is high; large stress, high requirement for edge spacing and sensitivity.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a novel from undercut crab-bolt.
In order to realize the purpose, the technical scheme of the utility model is that:
the novel self-undercut anchor bolt is characterized by comprising a screw rod, an expansion sheet, a nut and a flat pad, wherein the screw rod comprises a screw head, a screw part, a first cylindrical part, a second cylindrical part, a third cylindrical part, a circular table part, a screw tail and a spherical surface part which are sequentially connected from front to back, the screw part is connected with the nut in a threaded fit manner, the flat pad is positioned at the rear side of the nut, the outer diameter of the second cylindrical part is larger than that of the first cylindrical part, the outer diameter of the third cylindrical part is smaller than that of the first cylindrical part, the circular table part is gradually increased from front to back, the outer diameter of the screw tail is matched with that of the rear end of the circular table part, the outer diameter of the front end of the spherical surface part is matched with that of the rear end of the screw tail, the spherical surface part is gradually reduced from front to back, the outer side of the spherical surface part is in an outward convex arc shape, and the expansion sheet is sleeved on the outer side of the screw, the inner diameter of the expansion piece is smaller than the outer diameter of the second cylindrical part, and the front end of the expansion piece is propped against the rear end of the second cylindrical part;
the front part of the expansion sheet is convexly provided with a plurality of triangular anti-rotation points towards the outer side, the middle part of the expansion sheet is provided with a plurality of expansion force salient points, the middle part of the expansion sheet is also provided with a plurality of expansion round holes, the rear part of the expansion sheet is provided with a self-locking key along the circumferential direction, the outer diameter of the middle part of the self-locking key is larger than the outer diameters of the front part and the rear part of the self-locking key, the rear end of the expansion sheet is provided with a plurality of openings along the axial direction, the openings extend to the middle part of the expansion sheet, the rear part of the expansion sheet is divided into a plurality of self-cutting tool bits by the openings, the outer diameter of the rear end of the self-cutting tool bit is gradually increased from front to back, the self-cutting tool bit is arranged around the front part of the circular table part, the expansion sheet is provided with a groove along the axial direction, the semicircular anti-loosening groove is positioned between the two expansion force salient points.
Furthermore, the expansion round holes are arranged behind the expansion force salient points, and the expansion round holes and the expansion force salient points are arranged in a staggered mode along the circumferential direction of the expansion sheet.
Furthermore, the triangle rotation preventing points are distributed at equal intervals along the circumferential direction of the expansion piece, the expansion round holes are distributed at equal intervals along the circumferential direction of the expansion piece, and the expansion force salient points are distributed at equal intervals along the circumferential direction of the expansion piece.
Furthermore, the number of the triangular anti-rotation points, the expansion force salient points, the expansion round holes and the openings is 4.
Further, the cross section of the self-locking key is triangular.
The utility model has the advantages that: the material consumption is less, the utilization rate is high, the structure is simple, the volume is small, and the transportation is convenient; the self-locking key with the triangular protrusion is arranged on the outer side of the self-cutting tool bit, and when the self-cutting tool bit cuts a concrete hole, the self-locking key can firmly clamp the conical groove along with the increase of torque, so that the self-locking tool bit is stable and reliable; the expansion piece middle part is equipped with expansion round hole and expansion power bump, and expansion round hole and expansion power bump are crisscross along circumference and are set up, reduce the stress of expansion piece when rotatory cutting.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is another overall structure diagram of the present invention;
FIG. 3 is a schematic structural view of the screw rod of the present invention;
FIG. 4 is a schematic structural view of the expansion sheet of the present invention;
FIG. 5 is another schematic structural view of the expansion sheet of the present invention;
fig. 6 is a schematic structural view in the practice of the present invention.
Reference numerals:
1 screw 11 screw head 12 screw portion 13 first cylindrical portion 14 second cylindrical portion 15 third cylindrical portion
16 round platform part 17 screw tail 18 spherical part
2 expansion piece 21 self-locking key 22 self-cutting tool bit 23 triangular anti-rotation point 24 expansion force salient point
25 expanding round hole 26, groove 27, semi-circle anti-loosening groove 28 opening
3 nut 4 flat pad 5 marks the line.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model discloses a novel self undercut crab-bolt, a serial communication port, as shown in fig. 1 and fig. 2, including screw rod 1, inflation piece 2, nut 3 and flat pad 4, as shown in fig. 3, screw rod 1 includes by preceding screw head 11, screw rod portion 12, first cylinder portion 13, second cylinder portion 14, third cylinder portion 15, round platform portion 16, screw rod tail 17 and the spherical portion 18 that connects gradually after to, screw rod 1 is preferably cold-heading processing integrated into one piece.
As shown in fig. 1 ~ 3, the screw portion 12 is connected to the nut 3 by screw thread fit, the flat pad 4 is located at the rear side of the nut 3, the outer diameter of the second cylindrical portion 14 is larger than the outer diameter of the first cylindrical portion 13, the outer diameter of the third cylindrical portion 15 is smaller than the outer diameter of the first cylindrical portion 13, the outer diameter of the circular portion 16 increases gradually from front to rear, the outer diameter of the screw tail 17 matches the outer diameter of the rear end of the circular portion 16, the outer diameter of the front end of the spherical portion 18 matches the outer diameter of the rear end of the screw tail 17, the outer diameter of the spherical portion 18 decreases gradually from front to rear, the outer side of the spherical portion 18 is in a convex arc shape, the expansion piece 2 is sleeved on the outer side of the screw 1, the inner diameter of the expansion piece 2 is smaller than the outer diameter of the second cylindrical portion 14, and the front end of the expansion piece 2 abuts against the rear end of the second cylindrical.
As shown in fig. 4, a plurality of triangular rotation preventing points 23 are convexly arranged at the front part of the expansion sheet 2 towards the outside, the triangular rotation preventing points 23 are preferably distributed at equal intervals along the circumferential direction of the expansion sheet 2, a plurality of expansion force protruding points 24 are arranged at the middle part of the expansion sheet 2, the expansion force protruding points 24 are preferably distributed at equal intervals along the circumferential direction of the expansion sheet 2, a plurality of expansion round holes 25 are further arranged at the middle part of the expansion sheet 2, the expansion round holes 25 are preferably distributed at equal intervals along the circumferential direction of the expansion sheet 2, the expansion round holes 25 are preferably arranged at the back part relative to the expansion force protruding points 24, the expansion round holes 25 and the expansion force protruding points 24 are preferably arranged in a staggered manner along the circumferential direction of the expansion sheet 2, the expansion round holes 25 and the expansion force protruding points 24 are matched to reduce the stress of the expansion sheet 2 during the rotary cutting, a self-locking key 21 is arranged at the back part of the expansion sheet 2 along the circumferential direction, the, the rear end of inflation piece 2 is cut forward along the axial and is equipped with a plurality of openings 28, opening 28 extends to the middle part of inflation piece 2, the front end of opening 28 does not surpass the rear end of expansion round hole 25, opening 28 is divided into a plurality of autogenous cutter head 22 with the rear portion of inflation piece 2, the external diameter from the front to back crescent of autogenous cutter head 22 rear end to adaptation round platform portion 16 is by the shape of preceding external diameter increase to the back, autogenous cutter head 22 encircles the anterior setting of round platform portion.
As shown in fig. 5, the expansion sheet 2 is provided with a groove 26 along the axial direction, the groove 26 traverses the front end and the rear end of the expansion sheet 2, the groove 26 radially penetrates the expansion sheet 2, a semicircular anti-loosening groove 27 is provided in the middle of the groove 26, the semicircular anti-loosening groove 27 is located between the two expansion force protrusions 24, and the bottom edge of the semicircular anti-loosening groove 27 is located on the rear side of the arc edge.
In specific implementation, as shown in fig. 4 and 5, the number of the triangular anti-rotation points 23, the expansion force protruding points 24, the expansion circular holes 25 and the openings 28 is 4.
The cross section of the self-locking key 21 is triangular, the outer diameter of the middle part of the self-locking key 21 is larger than the outer diameters of the front part and the rear part of the self-locking key 21, and the self-locking key has a positioning effect when an anchor bolt is drilled.
During specific implementation, as shown in fig. 6, be equipped with the workstation subaerial, will pass the workstation and drill downwards from the undercut anchor bolt, under the initial condition one tooth line department mark line 5 is drawn to the front portion of screw rod portion 12, uses the undercut anchor bolt to drill on the concrete substrate, and the drill bit model is selected according to the crab-bolt model, and the drilling depth deepens 10mm according to tooth line department mark line 5 again, knocks into the crab-bolt with the hammer to concrete surface and flushes with tooth line department mark line 5, sheathes in by the fixed object, sheathes in plain cushion 4 and nut 3, and the rear end of plain cushion 4 supports the workstation upper end, then screws up nut 3.
As the nut 3 is screwed, the autogenous cutter head 22 of the expansion piece 2 cuts a concrete hole to form a taper hole, when the concrete hole is cut, the semicircular anti-loosening groove 27 is matched with the opening 28 to play a role in cutting the expansion piece 2, the autogenous cutter head 22 behind the semicircular anti-loosening groove 27 is unfolded outwards along with rotation, the previous part of the semicircular anti-loosening groove 27 is kept closed, the triangular bulge structure of the self-locking key 21 is firmly clamped at the taper groove along with the increase of torque, and at the moment, the installation of the self-undercut anchor bolt is completed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (5)
1. The novel self-undercut anchor bolt is characterized by comprising a screw rod, an expansion sheet, a nut and a flat pad, wherein the screw rod comprises a screw head, a screw part, a first cylindrical part, a second cylindrical part, a third cylindrical part, a circular table part, a screw tail and a spherical surface part which are sequentially connected from front to back, the screw part is connected with the nut in a threaded fit manner, the flat pad is positioned at the rear side of the nut, the outer diameter of the second cylindrical part is larger than that of the first cylindrical part, the outer diameter of the third cylindrical part is smaller than that of the first cylindrical part, the circular table part is gradually increased from front to back, the outer diameter of the screw tail is matched with that of the rear end of the circular table part, the outer diameter of the front end of the spherical surface part is matched with that of the rear end of the screw tail, the spherical surface part is gradually reduced from front to back, the outer side of the spherical surface part is in an outward convex arc shape, and the expansion sheet is sleeved on the outer side of the screw, the inner diameter of the expansion piece is smaller than the outer diameter of the second cylindrical part, and the front end of the expansion piece is propped against the rear end of the second cylindrical part;
the front part of the expansion sheet is convexly provided with a plurality of triangular anti-rotation points towards the outer side, the middle part of the expansion sheet is provided with a plurality of expansion force salient points, the middle part of the expansion sheet is also provided with a plurality of expansion round holes, the rear part of the expansion sheet is provided with a self-locking key along the circumferential direction, the outer diameter of the middle part of the self-locking key is larger than the outer diameters of the front part and the rear part of the self-locking key, the rear end of the expansion sheet is provided with a plurality of openings along the axial direction, the openings extend to the middle part of the expansion sheet, the rear part of the expansion sheet is divided into a plurality of self-cutting tool bits by the openings, the outer diameter of the rear end of the self-cutting tool bit is gradually increased from front to back, the self-cutting tool bit is arranged around the front part of the circular table part, the expansion sheet is provided with a groove along the axial direction, the semicircular anti-loosening groove is positioned between the two expansion force salient points.
2. The anchor according to claim 1, wherein said expansion holes are disposed rearwardly of said expansion force projections, said expansion holes and said expansion force projections being staggered circumferentially of said expansion sheet.
3. The anchor bolt as claimed in claim 2, wherein the triangular rotation preventing points are distributed at equal intervals along the circumferential direction of the expansion piece, the expansion circular holes are distributed at equal intervals along the circumferential direction of the expansion piece, and the expansion force protruding points are distributed at equal intervals along the circumferential direction of the expansion piece.
4. The novel self-undercut anchor bolt of claim 3, wherein said triangular anti-rotation points, said expansion force protrusions, said expansion holes and said openings are all 4 in number.
5. The novel self-undercut anchor as claimed in claim 1, wherein said self-locking tab is triangular in cross-section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920513987.5U CN209925385U (en) | 2019-04-16 | 2019-04-16 | Novel self-cutting bottom anchor bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920513987.5U CN209925385U (en) | 2019-04-16 | 2019-04-16 | Novel self-cutting bottom anchor bolt |
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| Publication Number | Publication Date |
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| CN209925385U true CN209925385U (en) | 2020-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920513987.5U Active CN209925385U (en) | 2019-04-16 | 2019-04-16 | Novel self-cutting bottom anchor bolt |
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| CN (1) | CN209925385U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973484A (en) * | 2019-04-16 | 2019-07-05 | 上海贤奕电梯配件有限公司 | A kind of novel self undercut anchor |
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2019
- 2019-04-16 CN CN201920513987.5U patent/CN209925385U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973484A (en) * | 2019-04-16 | 2019-07-05 | 上海贤奕电梯配件有限公司 | A kind of novel self undercut anchor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220412 Address after: 201602 Building 2, No. 2199, Shebei Road, Sheshan Town, Songjiang District, Shanghai Patentee after: SHANGHAI XIANGRUI FASTENER CO.,LTD. Address before: 201602 building 22, No. 2199, Shebei Road, Sheshan Town, Songjiang District, Shanghai Patentee before: Shanghai Xianyi Elevator Accessories Co.,Ltd. |
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| TR01 | Transfer of patent right |