CN101660337A - Self undercut anchor - Google Patents
Self undercut anchor Download PDFInfo
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- CN101660337A CN101660337A CN200910035045A CN200910035045A CN101660337A CN 101660337 A CN101660337 A CN 101660337A CN 200910035045 A CN200910035045 A CN 200910035045A CN 200910035045 A CN200910035045 A CN 200910035045A CN 101660337 A CN101660337 A CN 101660337A
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- Prior art keywords
- expansion sleeve
- self undercut
- undercut anchor
- open slot
- back taper
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Abstract
The invention relates to a self undercut anchor, which belongs to the technical field of fastening pieces. The self undercut anchor is provided with a roof bolt and an expansion sleeve sleeved on theroof bolt, wherein one end of the roof bolt is an inverted conical head. A pipe wall on one end of the expansion sleeve close to the inverted conical head is provided with an open slot distributed along circumference; and the pipe wall on one end of the expansion sleeve close to the inverted conical head is provided with an outside thread. An end of the roof bolt departing from the inverted conical head is provided with a circumferential restraining structure. When used, the roof bolt is inserted into a hole together with the expansion sleeve, and when the inverted conical head is located at the bottom of the hole, the expansion sleeve is pressed and screwed by an assistant tool of a restraining structure which restrains the external circumferential direction, thereby the expansion sleevescrew can expand while being screwed to the bottom of the hole as much as possible through the screwing effect of the thread. The expansion sleeve then can reach a perfect state by the stretching andexpanding force of the major diameter of the inverted conical head, thereby distinctly strengthening the anchoring effect.
Description
Technical field
The present invention relates to a kind of crab-bolt that is mainly used in building decorating industry, especially a kind of self undercut anchor belongs to technical field of fastening.
Background technology
Crab-bolt is industry securing members commonly used such as architectural decoration, and is of a great variety.Typical structure that it is basic such as application number are that 200320100106.6 Chinese invention patent is disclosed, comprise anchor pole, fixed muffle, branch sleeve and the connecting ring (formal name used at school expansion sleeve) of expanded radially can take place under external force.During use,, thereby contact and compress, make rock bolt shank be able to reliable anchoring, can not take place radially to rock with hole wall is installed because protruding deformation or spreading can take place expansion sleeve under external force.Yet, the expansion sleeve of this type of crab-bolt can not be positioned at the hole before expanding at the bottom of, though the trend of sinking is arranged in the expansion process, but external diameter enlarges during owing to expand, can't initiatively overcome hole wall and stop the resistance of sinking, therefore actual can't arriving at the bottom of the hole after expanding can not reach the maximum swelling diameter, do not given play to maximum anchorage effect.Retrieval finds, application number is that 200820123064.0 Chinese invention patent is considered the problems referred to above, discloses crab-bolt at the bottom of a kind of back expansion of using that matches with the back bottom expanding drill, its expansion sleeve by expand bottom, connecting portion and autotomy bottom form.But theory and practice can prove, its expansion sleeve is owing to there is no the function that positive guide is sunk, therefore its bottom of autotomying can not reach at the bottom of the hole, and also increasing the effect that hole wall hinders sinking bottom the expansion of its expansion sleeve, the result still exists above-mentioned prior art can not bring into play the deficiency of maximum anchorage effect.
Summary of the invention
The objective of the invention is to: the shortcoming at above-mentioned prior art exists proposes a kind of self undercut anchor with positive guide sinking effect, thereby makes it be brought into play maximum anchorage effect.
In order to reach above purpose, self undercut anchor of the present invention contains the anchor pole and the expansion sleeve that is enclosed within on the anchor pole that an end is the back taper head, has circumferential open slot on the tube wall of the first end of the contiguous back taper of described expansion sleeve; Its improvements are that the tube wall of the first end of the contiguous back taper of described expansion sleeve is shaped on external screw thread, and an end that deviates from the back taper head is shaped on circumferential restraining structure.Circumferentially restraining structure comprises and leaves radial slot, makes hexagonal counterbore or polygon gabarit termination etc.
During use, with anchor pole together with in the expansion sleeve patchhole, and when making the back taper head be positioned at the bottom of the hole, can when pressing down, screw expansion sleeve by the aid of the circumferential restraining structure in constraint expansion sleeve outer end, thereby precession effect by screw thread, make the expansion limit precession of expansion sleeve limit,, expanded the desired expansion state that reaches by the big footpath support of back taper head as far as possible near at the bottom of the hole, organically combine with the wedging function of external screw thread, thereby anchorage effect is obviously strengthened at hole wall.
It is that the open slot on the described expansion sleeve tube wall is the thread rotary orientation radial skew outwardly that the present invention further improves.Like this, tube wall can form cutting edge at the external screw thread place that disconnects, and when pressing down the precession expansion sleeve, cutting edge will produce shear action to hole wall, thereby forms the internal thread groove on hole wall, and expansion sleeve can be arrived at the bottom of the hole more swimmingly.
The present invention further improves again, the open slot on the described expansion sleeve tube wall towards described external thread rotary to axioversion.Like this, the cutting edge of open slot formation can incrementally in the precession process cut hole wall.
It is that the root of described open slot is by extending to the outer transition arc in the tube wall of expansion tube that the present invention further improves again.Like this, hole wall can be discharged by the bottom, hole, thereby be effectively reduced the precession resistance along the guiding with identical rotation direction open slot with screw thread gradually outwardly by the chip that the open slot cutting edge downcuts, and helps to guarantee that expansion sleeve arrives at the bottom of the hole.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of the embodiment of the invention one.
Fig. 2 is the lateral view of expansion sleeve among Fig. 1.
Fig. 3 is the structural representation of the embodiment of the invention two.
The specific embodiment
Embodiment one
The self undercut anchor of present embodiment as depicted in figs. 1 and 2, an end of anchor pole 2 has the back taper head that disjunctor is made, the other end is shaped on the trigonodont external screw thread.Expansion sleeve 1 is enclosed within on the anchor pole 2.Be shaped on external screw thread on the tube wall of the first end of expansion sleeve 1 contiguous back taper, and have four open slot a that are uniformly distributed along the circumference, these four open slots not only axially along external thread rotary to inclination, and radially also outwardly thread rotary orientation tilt, thereby form the cutting edge of acute angle A.The root of open slot a is by extending to outer transition arc b in the tube wall of expansion tube 1.The end that expansion sleeve 1 deviates from the back taper head is shaped on the radial slot c of two symmetries, thereby can constitute circumferential restraining structure with the respective protrusions of screwing tool.
Evidence, the axioversion angle of open slot (being the angle of open slot and expansion sleeve axis) is advisable between 5 °-15 °, and radial skew angle (being the supplementary angle of angle A) is advisable between 10 °-30 °.
During use, with anchor pole together with in the expansion sleeve patchhole, and the back taper head is positioned at the bottom of the hole, by aid, screw expansion sleeve when pressing down, the cutting edge that expansion sleeve open slot place external screw thread forms produces the precession shear action to hole wall, cuts out the internal thread groove on hole wall, the chip that downcuts is discharged smoothly along the guiding of open slot.The result, expansion sleeve is when being expanded expansion by the support of back taper head gradually, the internal thread that agrees with its external screw thread that cuts out gradually at hole wall screws under the guiding function, can arrive at smoothly at the bottom of the hole, the real realization autotomyed at the end, finally expanded by the support of the maximum outside diameter of back taper head to reach the maximum swelling state, thereby produces desirable mechanical lock bonding effect, the wedging function of external screw thread and hole wall obviously strengthens anchorage effect in addition.
Statistical test shows, the tension pull out force of the self undercut anchor of employing present embodiment and the like product of prior art on average are enhanced about more than once, and (the pulling force design standard of national standard M10 crab-bolt is 7kN at present, the tension pull out force can arrive 50kN after adopting present embodiment), effect is very remarkable.
Embodiment two
The self undercut anchor of present embodiment as shown in Figure 3, its basic structure and embodiment one roughly the same do not give unnecessary details in addition.The main difference part is that the end of thread of expansion sleeve 1 has the forward tapering, therefore can hole enlargement gradually as tapping screw when precession, and better effects if.In addition, because anchor pole 2 is longer, therefore constitute by whole threaded rod and the back taper head 2 ' that is screwed in its termination, also be with after the expansion tube 1 with expansion tube 1 by having the extension pipe 5 that is stuck in radial slot c structure cohesion, the outer end of extension pipe 5 is shaped on the similar circumferential restraining structure (not shown) with radial slot c.
During use, crab-bolt identical with embodiment one with regard to method for position, treat its arrive at the bottom of the Dutch position safe in place after, relending the packing ring 3 and the nut 4 that help the outer end need the fixture secure fixation.
In addition to the implementation, the present invention can also have other embodiments.For example, the quantity of open slot can increase as required with the increasing of expansion sleeve diameter, and externally threaded tooth form also can be other shape.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (9)
1. a self undercut anchor contains anchor pole and the expansion sleeve that is enclosed within on the anchor pole that an end is the back taper head, has circumferential open slot on the tube wall of the first end of the contiguous back taper of described expansion sleeve; It is characterized in that: the tube wall of the first end of the contiguous back taper of described expansion sleeve is shaped on external screw thread, and an end that deviates from the back taper head is shaped on circumferential restraining structure.
2. self undercut anchor according to claim 1 is characterized in that: described open slot towards the external screw thread swing to inclination.
3. self undercut anchor according to claim 2 is characterized in that: the open slot on the described expansion sleeve tube wall towards described external thread rotary to axioversion.
4. according to claim 2 or 3 described self undercut anchors, it is characterized in that: the root of described open slot is by extending to the outer transition arc in the tube wall of expansion tube.
5. self undercut anchor according to claim 4 is characterized in that: the end of thread of described expansion sleeve has the forward tapering.
6. self undercut anchor according to claim 5 is characterized in that: described anchor pole is made of whole threaded rod and the back taper head that is screwed in its termination.
7. self undercut anchor according to claim 6 is characterized in that: also be with extension pipe behind the described expansion tube.
8. self undercut anchor according to claim 7 is characterized in that: the axioversion angle of described open slot is 5 °-15 °, and the radial skew angle is 10 °-30 °.
9. self undercut anchor according to claim 8 is characterized in that: described circumferential restraining structure is one of radial slot, hexagonal counterbore or polygon gabarit termination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100350451A CN101660337B (en) | 2009-09-09 | 2009-09-09 | Self undercut anchor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100350451A CN101660337B (en) | 2009-09-09 | 2009-09-09 | Self undercut anchor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101660337A true CN101660337A (en) | 2010-03-03 |
| CN101660337B CN101660337B (en) | 2011-04-13 |
Family
ID=41788579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100350451A Expired - Fee Related CN101660337B (en) | 2009-09-09 | 2009-09-09 | Self undercut anchor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101660337B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606586A (en) * | 2012-03-08 | 2012-07-25 | 刘平原 | Bolt sleeve with cutting structure at front end |
| CN102839753A (en) * | 2012-09-07 | 2012-12-26 | 中国人民解放军63983部队 | Anchoring device used between FRP (Fiber Reinforced Plastic) pipe and metal bar |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2462128Y (en) * | 2001-01-12 | 2001-11-28 | 中国建筑科学研究院 | Tooth shape building anchor bolt for concrete |
| CN2818883Y (en) * | 2005-08-29 | 2006-09-20 | 徐洁媛 | Anchor bolt |
| DE102006025268A1 (en) * | 2006-05-31 | 2007-12-06 | Ccg-Concept Consulting Gmbh | Splaying anchor for construction technique, has sleeve formed with screw head according to type of screw with outer thread, so that anchor is screwed-in in mounting hole, and splaying cone of anchor bolt is retractable in splaying sleeve |
| CN2934417Y (en) * | 2006-07-29 | 2007-08-15 | 吴广祝 | Split type wall swelling type anchor bolt |
| CN201496356U (en) * | 2009-09-09 | 2010-06-02 | 朱国强 | Undercut anchor |
-
2009
- 2009-09-09 CN CN2009100350451A patent/CN101660337B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606586A (en) * | 2012-03-08 | 2012-07-25 | 刘平原 | Bolt sleeve with cutting structure at front end |
| CN102839753A (en) * | 2012-09-07 | 2012-12-26 | 中国人民解放军63983部队 | Anchoring device used between FRP (Fiber Reinforced Plastic) pipe and metal bar |
| CN102839753B (en) * | 2012-09-07 | 2014-09-17 | 中国人民解放军63983部队 | Anchoring device used between FRP (Fiber Reinforced Plastic) pipe and metal bar |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101660337B (en) | 2011-04-13 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110413 Termination date: 20180909 |
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| CF01 | Termination of patent right due to non-payment of annual fee |