CN201013710Y - Flat top anti-theft and destroy prevention screw nail - Google Patents
Flat top anti-theft and destroy prevention screw nail Download PDFInfo
- Publication number
- CN201013710Y CN201013710Y CNU2007200790477U CN200720079047U CN201013710Y CN 201013710 Y CN201013710 Y CN 201013710Y CN U2007200790477 U CNU2007200790477 U CN U2007200790477U CN 200720079047 U CN200720079047 U CN 200720079047U CN 201013710 Y CN201013710 Y CN 201013710Y
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- China
- Prior art keywords
- screw
- nut
- thread
- inner bolt
- internal
- 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 utility model relate to a screw part of a fastener, in particular to an antitheft damage-proof screw with flat cap. The utility model consists of an internal screw and an external screw nut and is characterized in that the internal screw for fastening is provided, a bolt with conical cap and flat head consists of two concentric screw rods with different diameters, the cap is embedded into the conical slot of the external screw nut, the screw thread of the upper rod with bigger diameter is a shallow flight left hand fine thread which is meshes with the external screw nut, the external screw nut is a provisional nut which drives the internal screw to fasten and is in the shape of a hexagonal nut, a center hole has a left hand fine box thread which meshes with the worm of the upper part of the internal screw, the strength of fastening in the center hole is lower than that between the internal screw and the corresponding fastening screw nut, and the internal screw is put into the external screw nut to be screwed and to compose a set of composite screw for application. The composite screw is put into the fastening screw nut to be fastened with a wrench and the thread is broken by the thread of the provisional nut under a certain torque to make the short screw nut slip around the internal screw. .Thereby, the internal fastening screw can not be removed by normal methods or tools.
Description
Technical field
The utility model relates to a kind of screw part, especially license plate of fastening piece and decorates anti-theft screw.
Background technique
At present, known conventional screw is convenient to loading and unloading because of it, also is convenient to the theft of crime one's share of expenses for a joint undertaking and destroys; Some have the screw of anti-theft feature, are 0420098372.4,02153416.0 anti-theft screw as the patent No., but lack decorative artistic effect.
Summary of the invention
In order to overcome above-mentioned deficiency, the utility model provides a kind of flat-top anti-theft anti-damaged screw, just can reach purpose not only antitheft but also attractive in appearance.
The technical scheme in the invention for solving the technical problem is: the flat-top anti-theft anti-damaged screw that is combined by inner bolt and outer nut, it is characterized in that: the inner bolt of fastening effect together is set, external form is for two saving the conical cap bolt of tack that the concentric different screw combinations of diameter forms up and down, its cap embeds the cone-shaped groove of outer nut, the thick screw flight of last joint, it is the left-handed shallow thread of closely-pitched with the outer nut coupling, outer nut is only to work the short-lived nut that drives the fastening effect of inner bolt, the same hexagon nut of external form, mesopore be with inner bolt on the left-handed box thread of closely-pitched of joint screw rod coupling, its locking intensity is lower than the locking intensity of the nut of inner bolt and supporting locking. and elder generation is with inner bolt during use, the outer nut of packing into screws into a suit screw assemblies.This screw assemblies is packed into and is tightened by spanner behind the locking nut, when reaching rated torque, short-lived nut thread destroys stripped thread, can only skid in the inner bolt periphery, just again interior fastening screw trip bolt can't be unloaded with conventional means and instrument, to reach antitheft purpose. the bolt head cap with inner bolt covers in addition, be arranged to the plane end socket, available stainless steel or colored plastic, light not only attractive in appearance is gorgeous but also can't be with the dismounting of conventional tool holder, and that plays that general anti-theft screw can't play has a coloured decorating action of light.
The beneficial effects of the utility model are: simple in structure, tamper robber is functional, ornamental by force, cost is low.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples:
Fig. 1 is an inner bolt panorama schematic representation, and Fig. 2 is an outer nut panorama schematic representation, and Fig. 3 is the inner bolt front elevational schematic, and Fig. 4 is that outer nut is dissected schematic representation, and Fig. 5 is that the screw assemblies that is assembled into is dissected schematic representation, and Fig. 6 is a schematic top plan view.
The conical cap of 1. inner bolts is arranged to plane end socket among the figure, 2. with the left-handed shallow thread of closely-pitched of outer nut coupling, 3. with the coarse thread of nut coupling, 4. with inner bolt cap inner conical groove movingly, 5. with the left-handed box thread of closely-pitched of inner bolt coupling.
Embodiment
In the drawings, the inner bolt of fastening effect together is set, external form is for two saving the conical cap bolt of tack that the concentric different screw combinations of diameter forms up and down, its cap embeds the cone-shaped groove (4) of outer nut, the thick screw flight of last joint, it is the left-handed shallow thread of closely-pitched (2) with the outer nut coupling, outer nut is only to work the short-lived nut that drives the fastening effect of inner bolt, the same hexagon nut of external form, mesopore be with inner bolt on the left-handed box thread of closely-pitched (5) of joint screw rod coupling, its locking intensity is lower than the locking intensity of the nut of inner bolt and supporting locking. and earlier with inner bolt, the outer nut of packing into screws into a suit screw assemblies during use.This screw assemblies is packed into and is tightened by spanner behind the locking nut, when reaching rated torque, short-lived nut thread destroys stripped thread, can only skid in the inner bolt periphery, just again interior fastening screw trip bolt can't be unloaded with conventional means and instrument, to reach antitheft purpose. the bolt head cap with inner bolt covers in addition, be arranged to the plane end socket, available stainless steel or colored plastic, light not only attractive in appearance is gorgeous but also can't be with the dismounting of conventional tool holder, and that plays that general anti-theft screw can't play has a coloured decorating action of light.
Claims (3)
1. flat-top anti-theft anti-damaged screw, combine by inner bolt and outer nut, it is characterized in that: the inner bolt of fastening effect together is set, external form is for two saving the conical cap bolt of tack that the concentric different screw combinations of diameter forms up and down, the thick screw flight of last joint, it is the left-handed shallow thread of closely-pitched (2) with the outer nut coupling, outer nut is only to work the short-lived nut that drives the fastening effect of inner bolt, the same hexagon nut of external form, mesopore be with inner bolt on the left-handed box thread of closely-pitched (5) of joint screw rod coupling, its locking intensity is lower than the locking intensity of the nut of inner bolt and supporting locking.
2. by the described plane anti-theft and anti-damage nut of claim 1, it is characterized in that: the conical cap tack of its inner bolt, be arranged to the plane end socket.
3. by the described plane anti-theft anti-damaged screw of claim 1, it is characterized in that: the conical cap (1) of the tack of inner bolt, the cone-shaped groove (4) of embedding outer nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200790477U CN201013710Y (en) | 2007-04-09 | 2007-04-09 | Flat top anti-theft and destroy prevention screw nail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200790477U CN201013710Y (en) | 2007-04-09 | 2007-04-09 | Flat top anti-theft and destroy prevention screw nail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201013710Y true CN201013710Y (en) | 2008-01-30 |
Family
ID=39025499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200790477U Expired - Fee Related CN201013710Y (en) | 2007-04-09 | 2007-04-09 | Flat top anti-theft and destroy prevention screw nail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201013710Y (en) |
-
2007
- 2007-04-09 CN CNU2007200790477U patent/CN201013710Y/en not_active Expired - Fee Related
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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 |