CN201810640U - Polycylinder combination head tapping screw - Google Patents
Polycylinder combination head tapping screw Download PDFInfo
- Publication number
- CN201810640U CN201810640U CN2010205583174U CN201020558317U CN201810640U CN 201810640 U CN201810640 U CN 201810640U CN 2010205583174 U CN2010205583174 U CN 2010205583174U CN 201020558317 U CN201020558317 U CN 201020558317U CN 201810640 U CN201810640 U CN 201810640U
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- CN
- China
- Prior art keywords
- screw
- head
- polycylinder
- center line
- combination head
- 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
Links
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 17
- 230000005611 electricity Effects 0.000 abstract description 3
- 235000013351 cheese Nutrition 0.000 abstract 1
- 230000007812 deficiency Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
The utility model discloses a polycylinder combination head tapping screw, which is used for fastening a meter cover and a meter bottom of an electric energy meter. The head of the polycylinder combination head tapping screw is formed by combining a plurality of part of cylinders which are same in radius and uniformly distributed along a circumference, and the head of the polycylinder combination head tapping screw is provided with a plurality of screwing grooves with the same quantity to the plurality of part of cylinders which are same in radius. The plurality of screwing grooves of the head are respectively formed by a plane coincident to a center line of the screw and a plane obliquely crossing the center line of the screw, the included angle between the two planes is smaller than 90 degrees and larger than 60 degrees, and the oblique direction of the plane obliquely crossing the center line of the screw inclines from the center of a polycylinder combination head towards the direction of an exoscopic screw thread section. Compared with a cross recessed cheese head screw used on the traditional electric energy meter, the polycylinder combination head tapping screw in the utility model cannot be dismounted and then mounted after the electric energy meter is opened, without using special tools, and has the advantage of effectively preventing electricity stealing.
Description
Affiliated technical field
The utility model relates to a kind of fastening piece, particularly relates to the fastening piece of using on a kind of anti-electricity-theft electric energy meter that does not have special tool to install and remove.
Background technique
The table lid and the screw at the table end that are used for fastening electric energy meter at present on the electric energy meter all are the cross recess fillister head screws, as long as the deficiency of this fastening screw trip bolt is to have " Phillips screw driver " just to be easy to electric energy meter is opened, change electric energy meter back panel wiring, make electricity filching person easily stealing succeed.
The model utility content
The purpose of this utility model is to overcome the deficiency that used fastening screw trip bolt all is on the present electric energy meter " cross recess fillister head screw ", and providing a kind of does not have special tool the table lid and the fastening screw trip bolt of table between the end of electric energy meter can't be pulled down the polycylindser combination head tapping screw of opening electric energy meter.
The purpose of this utility model is achieved through the following technical solutions.The threaded end of polycylindser combination head tapping screw has a self tapping flute, and the head of this screw is combined by the identical part cylinder along garden Zhou Junbu of a plurality of radiuses, at head part cylindrical section quantity identical a plurality of the screw grooves identical with a plurality of radiuses is arranged.This head a plurality of screw groove and become with a plane combinating face with the center line oblique of screw with plane that the center line of this screw coincides by one respectively, the angle on these two planes less than 90 ° greater than 60 °, tilt to export-oriented thread section direction with the oblique center on the center line oblique plane of this screw from the polycylindser combination head.
The utility model and present electric energy meter table lid and table between the end fastening used cross recess fillister head screw compare, the utility model is tightened or unscrewed all and must use special tool no matter be, there is not special tool just can't or unscrew with this screw-driving, electric energy meter is dispatched from the factory from factory packs into after the user uses, the user can't not open the stealing of can't juggling things with the table end with the table lid of this electric energy meter because of there being special tool, has anti-electricity-theft effectively advantage.
Description of drawings
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail, in the accompanying drawing, the self tapping flute of 1-threaded end; The 2-thread section; 3-polycylindser combination head; The plane of 4-and thread center's line oblique; The plane of 5-and screw central lines; The plane of α-coincide with the center line of screw and with the angle on screw center line oblique plane.
When implementing, earlier carry out the mould of taking the lead on the screw heading machine according to requirement of the present utility model, press the same manufacture method of cross recess half knob screw then, on the screw heading machine, polycylindser combination head 3 is created, on BT tapping screw thread-rolling machine, the self tapping flute 1 and the thread section 2 of threaded end created again, the utility model only is that with the difference of standard piece BT tapping screw the screw head shape is different, and all the other are the same.When the part socket cap number of polycylindser combination is 2, its cross-sectional face shape and elliptical-type are seemingly, partly the socket cap number is 3 o'clock, its head cross section shape and equilateral triangle are similar, partly the socket cap number is 4 o'clock, its cross-sectional face shape is similar with square, and partly the socket cap number can not be too many for it, is advisable to be no more than 5.And the longest section C on screw central lines plane 5 should polycylindser combination head total length 1/2～2/3 between for well.
When tightening, to use the utility model the special screw that matches with the utility model nose shape to revolve tool, active force acted on the plane 5 with the screw central lines the utility model is screwed, when special screw revolves the tool counterrotating, active force acts on the plane 4 with screw center line oblique, it can't be unscrewed and pull down.Unscrew when pulling down when needs, have only and use the special sleeve spanner that matches with nose shape of the present utility model just can pull down.The table lid that the utility model is used in electric energy meter and table are contained in counter sink when fastening between the end interior, and electricity filching person does not all have this special sleeve spanner, so can't take apart, is one of good anti-electricity-theft means.
Claims (2)
1. polycylindser combination head tapping screw, one self tapping flute is arranged in the termination of screw thread, the head that it is characterized in that screw is combined by the identical part cylinder along garden Zhou Junbu of a plurality of radiuses, at this head part cylindrical section quantity identical a plurality of the screw grooves identical with a plurality of radiuses is arranged.
2. by the described polycylindser combination head of claim 1 tapping screw, the a plurality of grooves that screw that it is characterized in that this head are combined by plane and plane with the center line oblique of this screw that a center line with screw coincides respectively, the angle on this two plane less than 90 ° greater than 60 °, with the center line oblique plane of this screw oblique be that center from the polycylindser combination head tilts to export-oriented thread section direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205583174U CN201810640U (en) | 2010-10-07 | 2010-10-07 | Polycylinder combination head tapping screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205583174U CN201810640U (en) | 2010-10-07 | 2010-10-07 | Polycylinder combination head tapping screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201810640U true CN201810640U (en) | 2011-04-27 |
Family
ID=43893582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205583174U Expired - Fee Related CN201810640U (en) | 2010-10-07 | 2010-10-07 | Polycylinder combination head tapping screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201810640U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993378A (en) * | 2015-05-22 | 2015-10-21 | 重庆从仁机电有限公司 | Self-tapping screw of spark plug cap |
-
2010
- 2010-10-07 CN CN2010205583174U patent/CN201810640U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993378A (en) * | 2015-05-22 | 2015-10-21 | 重庆从仁机电有限公司 | Self-tapping screw of spark plug cap |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110427 Termination date: 20191007 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |