CN103557216A - Special expansion screw - Google Patents
Special expansion screw Download PDFInfo
- Publication number
- CN103557216A CN103557216A CN201310469718.0A CN201310469718A CN103557216A CN 103557216 A CN103557216 A CN 103557216A CN 201310469718 A CN201310469718 A CN 201310469718A CN 103557216 A CN103557216 A CN 103557216A
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- Prior art keywords
- special
- screw
- expansion screw
- cylindrical shell
- drift
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Abstract
The invention discloses a special expansion screw, namely the special-type expansion screw, which is a cast iron piece produced by precision casting technology and composed of a barrel body and a wedge. The special expansion screw is completely different from an existing expansion screw which is quite limited in bearing of drawing force due to the fact that an expansion part is too short. The special expansion screw can allow the barrel body to expand entirely to be in tight contact with a hole wall and exert huge and uniform expansion force upon the hole wall, so that the special expansion screw can be firmly fixed in a hole. Once mounted, the screw can never be pulled out again. The special expansion screw is easy to mount due to good expansion performance. The special expansion screw which is firm and attractive caters to taste for requirements on attractiveness. The existing expansion screw is entirely possible to be obsoleted with appearance of the special expansion screw.
Description
One. the shortcoming of existing setscrew.
, all there is obvious shortcoming in existing two class setscrew products.The structure of the first setscrew is: a middle longer screw mandrel, and outer surface cover the thin-walled iron pipe of a section shorter, and iron pipe lower end has 4 short grooves, on the screw mandrel of iron pipe top, is furnished with plain cushion bullet pad and nut.The end upsetting of screw mandrel greatly coning.The diameter of conical base biggest place is greater than iron pipe internal diameter and is less than iron pipe external diameter.During use, when fastening nut is up mentioned screw mandrel, cone expands thin walled tube and hole wall is produced to expansive force, just relies on this expansive force to be fixed in hole by screw.Another kind of setscrew, is a bit of thick walled tube, and a tooth has been attacked as nut in the top of inner chamber, and up big and down small taper is made in the Lower Half aperture of inner chamber, the interior middle drift that the rounding taper type that tapering is identical is set.On thick walled tube Lower Half tube wall, have 4 grooves, to facilitate distending, outer surface annular knurl, is intended to increase friction factor.During use, drift is down hammered into shape tightly, outwards expanding hole wall is produced to expansive force bottom of tube wall, just relies on this expansive force to be fixed in hole by screw.Above-mentioned two kinds of setscrews, their common shortcomings are that the position that can expand is too short, 1/4th of not enough total length.All the other tube walls of 3/4ths and hole wall do not have close contact at all, therefore have no expansive force, can say.Generally speaking, the pulling capacity that this setscrew can bear is very limited, and this is the most basic shortcoming.
Two. the superior function of special swollen screw.
The full name of special swollen screw is " expanding screw bolt ".Its performance is completely different from aforesaid two kinds of setscrews.It can allow the whole close contacts of hole wall of screw bulk expansion and hole.Under drift effect, produce huge and uniform expansive force is firmly fixed on by it among hole.Because expansion character is good especially, so installation is also very easy, the existing setscrew of energy force rate that bears drawing can be multiplied several times, and shear-stable ability also significantly improves.Once after special swollen screw installs, just cannot again it be pulled out at all.
Three. make the technological scheme of special swollen screw.
Special swollen screw is the ironcasting by precision pouring explained hereafter.It is comprised of cylindrical shell and drift two-part.As shown in drawings.The cylindrical shell section of being thick walled tube, outer surface substantially horizontal has the groove that several the depths do not wait, in order that remove, does not have effective material, weight reduction, and increase friction factor.Nut is used as in the top tapping of inwall.Up big and down small taper is made in the Lower Half aperture of inwall, centre arranges the drift of the rounding taper type that tapering is identical, the technical measures of most critical are on cylindrical shell, to open a vertical groove (quantity of Yin Siya is more more than one times than standard nut, the intensity of screw has greatly affluence, so hold a groove, can not affect the ability of bearing drawing).Cylindrical shell has laterally just had a stretchability like this, allows it can free expansion.When installing and using, to utilize all suitable iron staffs of a thickness and length, drift is withstood in lower end, hammering iron staff above, drift is moved down, until swelling completely, the outer surface of special so swollen screw will to the inwall generation of hole is huge, uniform expansive force be firmly fixed among hole the cylindrical shell of special swollen screw.After the object being fixed is laid and put in place, then the screw rod of configuration is in addition tightened from top to bottom, what be finally exposed is the hexagonal nuts of screw rod, if be used in the place of requirement attractive in appearance, not only firmly but also attractive in appearance.
Four. accompanying drawing explanation
Accompanying drawing is the front elevation view of special swollen screw.In figure:
1. special swollen screw cylindrical shell
2. a tooth position
3. drift
4. vertical slot.
Claims (1)
1. special swollen screw is the ironcasting by precision pouring explained hereafter.It is comprised of cylindrical shell and drift two-part.The cylindrical shell section of being thick walled tube, outer surface substantially horizontal has the groove that several the depths do not wait, in order that remove, does not have effective material with weight reduction and increases friction factor.Nut is used as in the top tapping of inwall.Up big and down small taper is made in Lower Half endoporus aperture, and centre arranges the drift of the rounding taper type that tapering is identical.The technical measures of most critical are on cylindrical shell, to open a vertical groove, and cylindrical shell has laterally just had a stretchability like this, allow it can free expansion.When installing and using, to utilize all suitable iron staffs of a thickness and length, drift is withstood in lower end, hammering iron staff above, drift is moved down, until swelling completely, the outer surface of special so swollen screw will to the inwall generation of hole is huge, uniform expansive force be firmly fixed among hole the cylindrical shell of special swollen screw.If this screw is used in the place of requirement attractive in appearance, not only firmly but also attractive in appearance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310469718.0A CN103557216A (en) | 2013-09-25 | 2013-09-25 | Special expansion screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310469718.0A CN103557216A (en) | 2013-09-25 | 2013-09-25 | Special expansion screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103557216A true CN103557216A (en) | 2014-02-05 |
Family
ID=50011543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310469718.0A Pending CN103557216A (en) | 2013-09-25 | 2013-09-25 | Special expansion screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103557216A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2139640Y (en) * | 1992-09-29 | 1993-08-04 | 佛山市石湾区紧固件厂 | Bolt combined with expanding sleeve |
| CN2177118Y (en) * | 1993-10-14 | 1994-09-14 | 朱耀明 | Expansion rod |
| EP0791756A1 (en) * | 1996-02-21 | 1997-08-27 | Societe De Prospection Et D'inventions Techniques Spit | Dowell anchor for solid and hollow materials |
| CN2318444Y (en) * | 1996-11-25 | 1999-05-12 | 方江于 | Hidden expansion nut cover |
| WO2003106848A1 (en) * | 2002-06-14 | 2003-12-24 | Turner Intellectual Propertty Limited | Wall plug |
| CN202381475U (en) * | 2011-10-31 | 2012-08-15 | 宣伯民 | Steel expansion bolt having hole wall with relatively large friction surface |
-
2013
- 2013-09-25 CN CN201310469718.0A patent/CN103557216A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2139640Y (en) * | 1992-09-29 | 1993-08-04 | 佛山市石湾区紧固件厂 | Bolt combined with expanding sleeve |
| CN2177118Y (en) * | 1993-10-14 | 1994-09-14 | 朱耀明 | Expansion rod |
| EP0791756A1 (en) * | 1996-02-21 | 1997-08-27 | Societe De Prospection Et D'inventions Techniques Spit | Dowell anchor for solid and hollow materials |
| CN2318444Y (en) * | 1996-11-25 | 1999-05-12 | 方江于 | Hidden expansion nut cover |
| WO2003106848A1 (en) * | 2002-06-14 | 2003-12-24 | Turner Intellectual Propertty Limited | Wall plug |
| CN202381475U (en) * | 2011-10-31 | 2012-08-15 | 宣伯民 | Steel expansion bolt having hole wall with relatively large friction surface |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20170412 |
|
| AD01 | Patent right deemed abandoned |