CN2686772Y - Post-cutting drill bit - Google Patents
Post-cutting drill bit Download PDFInfo
- Publication number
- CN2686772Y CN2686772Y CN 200420020872 CN200420020872U CN2686772Y CN 2686772 Y CN2686772 Y CN 2686772Y CN 200420020872 CN200420020872 CN 200420020872 CN 200420020872 U CN200420020872 U CN 200420020872U CN 2686772 Y CN2686772 Y CN 2686772Y
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- CN
- China
- Prior art keywords
- drill bit
- post
- double
- expansion link
- rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The purpose of the utility model is to design a rear-cutting drilling head of which structure adopts two double-edge blades provided with a main cutting edge and a bottom cutting edge. The bottom cutting can also be conducted when the two side cutting is conducted and thus the rapid temperature elevating condition can not be generated by over friction and also the hole expanding efficiency is improved. The fixing mode of the double-edge blades is the contacting between surfaces and thus the stress is uniform in cutting and the service lives of the double-edge blades can be prolonged. Meanwhile, the bottom of a telescopic rod is sheathed with a spring and the back returning of the double-edge blades is completed by the back returning of the elastic force of the spring after hole expanding and thus the operation is very convenient.
Description
Technical field
The utility model relates to a kind of drill bit, relates in particular to a kind of post-cut drill bit that is applied in the bolt counter-boring techniques.
Background technology
Efficient, life-span and the comfort level of the fine or not main distinction of drill bit on drill bit itself uses, but present drill bit product has just solved this technical barrier of reaming basically, do not consider that for problems such as the quality assurance of drill bit itself and service life are more the drill bit that causes present reaming to be used exists following shortcoming:
(1) with reference to being respectively the structural representation of existing drill bit before and after reaming shown in figure 1a, the 1b, the structure blade of existing drill bit fixedly be to adopt a some contact, promptly fix blade 1-1 by fixed axis 1-4, this fixed form is stressed to be concentrated, and causes axial region to disconnect easily;
(2) drill bit adopts the piston type telescopic method that a piston 1-3 is set in piston cylinder 1-2, and after reaming finished, the recovery of blade 1-1 belonged to passive type, inconvenience;
(3) the blade 1-5 tip of blade 1-1 acutangulates α, and it is too fast to wear and tear when cutting, and reduce service life;
(4) the bottom 1-6 of blade 1-1 will be subjected to frictional force and blade is sharply heated up when reaming, also influence the service life of blade 1-1;
(5) blade 1-1 cuts the reaming that simultaneously rubs by one side, certainly will influence reaming speed.
The utility model content
The present invention is for solving the problem that above-mentioned prior art exists, and its purpose just is to provide a kind of and can improves reaming efficient and can prolong the blade post-cut drill bit in service life.
For reaching above-mentioned purpose, post-cut drill bit of the present utility model is characterized in comprising: form female drilling rod; One connecting rod is made up of a body of rod and masthead, and it is formed with the through hole that runs through the described body of rod and masthead, and described body of rod periphery is formed with external screw thread and revolves with the internal thread with described drilling rod and join, and described masthead is formed with the opening of two symmetries; Expansion link, its bottom is arranged with spring, is inserted through the through hole of described connecting rod; Be formed with the pad of a breach, be sheathed on the described connecting rod; And two double-edged razor blades with major cutting edge and bottom sword, be formed with a permanent opening in described major cutting edge one side, and be embedded at respectively in the opening of described connecting rod symmetry.
Above-mentioned expansion link comprises a belly, a neck and a bottom.
The belly slightly larger in diameter of above-mentioned expansion link is in the diameter of above-mentioned neck and bottom.
Be to form an obtuse angle between the major cutting edge of above-mentioned double-edged razor blade and the bottom blade.
Above-mentioned double-edged razor blade is embedded at the said fixing opening by above-mentioned pad and fixes.
Above-mentioned double-edged razor blade is contacted with the belly of above-mentioned expansion link in the relative side of its permanent opening.
The diameter of above-mentioned through hole matches with the belly diameter of expansion link.
Adopt the post-cut drill bit of this spline structure, have following characteristics: the fixed form of (1) double-edged razor blade is a face and the contacting of face, thus double-edged razor blade when cutting stressed evenly, can prolong the service life of double-edged razor blade; (2) after reaming, the recovery of double-edged razor blade is to finish by the elastic returning that is sheathed on expansion link bottom spring self, and the owner is moving to reclaim, easy to operate; (3) double-edged razor blade has the two-sided blade of major cutting edge and bottom blade, also can carry out the bottom cutting when carrying out the both sides cutting, and the excessive rapid intensification situation that causes that neither can occur rubbing has improved the efficient of reaming again.
For further specifying above-mentioned purpose of the present utility model, design feature and effect, the utility model is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 a is the existing schematic diagram of drill bit before reaming.
Fig. 1 b is the existing schematic diagram of drill bit after reaming.
Fig. 2 a is the schematic diagram of post-cut drill bit of the present utility model before reaming.
Fig. 2 b is the schematic diagram of post-cut drill bit of the present utility model after reaming.
Fig. 3 a is the structural representation of expansion link.
Fig. 3 b is the structural representation of connecting rod.
Fig. 3 c is the left view of Fig. 3 b.
Fig. 3 d is the structural representation of pad.
Fig. 3 e is the structural representation of double-edged razor blade.
The specific embodiment
Shown in figure 2,3, post-cut drill bit of the present utility model, its structure comprises: form a female drilling rod 6; Expansion link 5, the slightly larger in diameter of its belly 5-2 is in the diameter of neck 5-3 and bottom 5-1; Connecting rod 2, comprise body of rod 2-4 and masthead 2-3, be formed with the through hole 2-1 that runs through body of rod 2-4 and masthead 2-3, body of rod 2-4 periphery is formed with external screw thread and revolves with the internal thread with drilling rod 6 and join, masthead 2-3 is formed with the opening 2-2 of two symmetries, and the diameter of through hole 2-1 matches with the belly 5-2 diameter of expansion link 5; Be formed with the pad 3 of a breach 3-1; Double-edged razor blade 4 with major cutting edge 4-2 and bottom blade 4-1 is formed with a permanent opening 4-3 in a side of major cutting edge; And spring 7 constitutes.
The connected mode of each parts is that behind the sheathed spring 7 of the bottom of expansion link 5 5-1, the company of being inserted through is by the through hole 2-1 of bar 2; Pad 3 is had externally threaded body of rod 2-4 bottom from connecting rod 2 be inserted in connecting rod 2; After rotation pad 3 makes its breach 3-1 and one of them opening 2-2 of connecting rod 2 overlaps, put into a double-edged razor blade 4, make blade back 4-4 contact fixing with the belly 5-2 of expansion link 5, after rotating pad 3 once more and making breach 3-1 and another opening 2-2 of connecting rod 2 overlaps, put into another double-edged razor blade 4 again, then pad 3 is rotated slightly, up to making breach 3-1 not overlap the place with any opening 2-2, such two double-edged razor blades 4 just are embedded in the opening 2-2 of 2 liang of symmetries of connecting rod respectively, and back cushion sheet 3 is embedded at permanent opening 4-3 and is fixed; Body of rod 2-4 with connecting rod 2 screws in the drilling rod 6 at last.
Thereby post-cut drill bit of the present utility model is to make double-edged razor blade 4 open the purpose that reaches reaming by stretching of expansion link 5.When expansion link 5 is in when normally not stressing state, in the opening 2-2 of two double-edged razor blades, 4 income connecting rods 2, can freely enter in the straight hole that common drill bit bored, as schematic diagram before Fig. 2 a reaming.When entering the straight hole bottom, the rotary drill rod 6 that pressurizes a little, spring 7 presses down expansion link 5, and double-edged razor blade 4 can slowly be opened and draw, thereby original straight hole hole undercutting is whittled into bellmouth, as the schematic diagram after Fig. 2 b reaming.After reaming finishes, mention drilling rod 6 slightly, then spring 7 is recovered to original position with double-edged razor blade 4 under the effect of elastic-restoring force.
Possess following advantage according to aforesaid post-cut drill bit of the present utility model:
(1) double-edged razor blade 4 of the utility model post-cut drill bit is to contact with expansion link belly 5-2 by blade back 4-4 to fix, spacing with pad 3, this fixed form is to contact fixing with face by face, therefore double-edged razor blade 4 is stressed even when cutting, can prolong the service life of double-edged razor blade 4;
(2) after reaming, the recovery of double-edged razor blade 4 is to finish by the elastic returning that is sheathed on expansion link 5 bottom 5-1 springs 7 self, and the owner is moving to reclaim, easy to operate;
(3) become an obtuse angles beta between the major cutting edge 4-2 of double-edged razor blade 4 and the bottom blade 4-1, when cutting, stand test, and owing to have two-sided blade, when carrying out the both sides cutting, also can carry out the bottom cutting, the excessive rapid intensification situation that causes that neither can occur rubbing has improved the efficient of reaming again.
In sum, post-cut drill bit of the present utility model has been done significantly to improve to the structure in the use of drill bit itself on the basis of existing structure, is better choice to constructing, and can be widely used in journey.
Though the utility model is described with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, under the situation that does not break away from the utility model spirit, also can make the variation and the modification of various equivalences, therefore, as long as variation, the modification to the foregoing description all will drop in the scope of the utility model claims in connotation scope of the present utility model.
Claims (7)
1. post-cut drill bit is characterized in that comprising:
Form female drilling rod;
One connecting rod is made up of a body of rod and masthead, and it is formed with the through hole that runs through the described body of rod and masthead, and described body of rod periphery is formed with external screw thread and revolves with the internal thread with described drilling rod and join, and described masthead is formed with the opening of two symmetries;
Expansion link, its bottom is arranged with spring, is inserted through the through hole of described connecting rod;
Be formed with the pad of a breach, be sheathed on the described connecting rod; And
Two double-edged razor blades with major cutting edge and bottom blade are formed with a permanent opening in described major cutting edge one side, and are embedded at respectively in the opening of described connecting rod symmetry.
2. post-cut drill bit as claimed in claim 1 is characterized in that: described expansion link comprises a belly, a neck and a bottom.
3. post-cut drill bit as claimed in claim 2 is characterized in that: the belly slightly larger in diameter of described expansion link is in the diameter of described neck and bottom.
4. post-cut drill bit as claimed in claim 1 is characterized in that: be to form an obtuse angle between the major cutting edge of described double-edged razor blade and the bottom blade.
5. post-cut drill bit as claimed in claim 1 is characterized in that: described double-edged razor blade is embedded at described permanent opening by described pad and fixes.
6. post-cut drill bit as claimed in claim 1 or 2 is characterized in that: described double-edged razor blade contacts with the belly of described expansion link in the relative side of its permanent opening.
7. post-cut drill bit as claimed in claim 1 or 2 is characterized in that: the diameter of described through hole matches with the belly diameter of expansion link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420020872 CN2686772Y (en) | 2004-03-05 | 2004-03-05 | Post-cutting drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420020872 CN2686772Y (en) | 2004-03-05 | 2004-03-05 | Post-cutting drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2686772Y true CN2686772Y (en) | 2005-03-23 |
Family
ID=34669410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420020872 Expired - Fee Related CN2686772Y (en) | 2004-03-05 | 2004-03-05 | Post-cutting drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2686772Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012139435A1 (en) * | 2011-04-14 | 2012-10-18 | Li Guozhong | Specialized drill bit for deep hole inverted t-shaped pile and formation method thereof |
| CN103967414A (en) * | 2014-05-19 | 2014-08-06 | 郑州神利达钻采设备有限公司 | Drill with each drill piece provided with two working faces |
| CN106061697A (en) * | 2014-03-04 | 2016-10-26 | 木构造系统株式会社 | Device for forming expanded hole section |
| CN106903349A (en) * | 2017-04-27 | 2017-06-30 | 湖北武大珞珈工程结构检测咨询有限公司 | A kind of electric drill reaming bit |
-
2004
- 2004-03-05 CN CN 200420020872 patent/CN2686772Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012139435A1 (en) * | 2011-04-14 | 2012-10-18 | Li Guozhong | Specialized drill bit for deep hole inverted t-shaped pile and formation method thereof |
| CN106061697A (en) * | 2014-03-04 | 2016-10-26 | 木构造系统株式会社 | Device for forming expanded hole section |
| US9849606B2 (en) | 2014-03-04 | 2017-12-26 | Mokukouzou System Co., Ltd. | Device for forming expanded hole section |
| CN103967414A (en) * | 2014-05-19 | 2014-08-06 | 郑州神利达钻采设备有限公司 | Drill with each drill piece provided with two working faces |
| CN106903349A (en) * | 2017-04-27 | 2017-06-30 | 湖北武大珞珈工程结构检测咨询有限公司 | A kind of electric drill reaming bit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |