ELECTRICALLY CONDUCTIVE SCREW CONNECTION AND SPECIAL BUSHING FOR A SCREW CONNECTION OF SAID TYPE

• US 20140011409A1
• Filed: 03/26/2012
• Published: 01/09/2014
• Est. Priority Date: 05/20/2011
• Status: Abandoned Application

• Current Assignee: Ruia Global Fasteners Ag (Whitesell Group)
• Original Assignee: Ruia Global Fasteners Ag (Whitesell Group)
• Inventors: Schraer, Thorsten, Giraud, Wolfgang
• Application Number:
  US14/005,897
• Publication Number:
  US 20140011409A1
• Time in Patent Office: Days
• US Class Current: 439/784
• CPC Class Codes: B60B 7/0013 Hub caps
• CPC Class Codes: B60B 7/20 having an element mounted for rotation independently of wheel rotation
• CPC Class Codes: B60K 2360/16 Type of output information
• CPC Class Codes: B60K 2360/797 at the vehicle exterior
• CPC Class Codes: B60K 35/00 Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
• CPC Class Codes: B60K 35/28 characterised by the type of the output information, e.g. video entertainment or vehicle dynamics information; characterised by the purpose of the output information, e.g. for attracting the attention of the driver
• CPC Class Codes: B60K 35/60 Instruments characterised by their location or relative disposition in or on vehicles arrangements of lighting devices on dashboards B60Q3/10
• CPC Class Codes: B60Q 1/326 on or for wheels
• CPC Class Codes: B60Q 1/50 for indicating other intentions or conditions, e.g. request for waiting or overtaking
• CPC Class Codes: H01R 4/307 characterised by the thread of the screw or nut

Abstract

An electrically conductive screw connection between two parts (10, 12) which are screwed to one another by means of a screw (16) with a screw head (18) and with a shank (22) with an external thread (24) and by means of a nut (28), wherein the screw (16) runs through a bore (14) in one part (10), wherein the electrical contact between the other part (12) and the screw (16) is produced by teeth (27) on the workpiece-side surface of the screw head (18) and/or of the nut (28) or of a washer (30) arranged between the nut (28) and the other part (12), whereas the contact between the screw (16) and one part (10) is produced by a bushing (34; 34′) which is formed so as to be radially elastic and which is arranged coaxially with respect to the shank (22) of the screw (16) in a portion (15) of the bore (14) with an enlarged inner diameter.

Claims

1. Electrically conductive screw connection between two parts (10, 12) which are screwed to one another by means of a screw (16), having a screw head (18) and a shank (22) with an external thread (24), and by means of a nut (28), wherein the screw (16) runs through a bore (14) in the one part (10), characterised in that the electrical contact between the other part (12) and the screw (16) is produced by teeth (27) on the workpiece-side surface of the screw head (18) and/or of the nut (28) or of a washer (30) arranged between the nut (28) and the other part (12), whereas the contact between the screw (16) and the one part (10) is produced by a bushing (34;

34′

) which is formed so as to be radially elastic and which is arranged coaxially with respect to the shank (22) of the screw (16) in a portion (15) of the bore (14) having an enlarged internal diameter.

2. Electrically conductive screw connection according to claim 1, characterised in that the bushing (34;

34′

) is formed from a corrugated sheet metal strip, of which the corrugations (40, 42) are arranged parallel to the axis of rotation of the bore (14).

3. Electrically conductive screw connection according to claim 2, characterised in that three corrugation peaks (40) and three corrugation troughs (42) are arranged over a circumference of the bushing (34;

34′

).

4. Electrically conductive screw connection according to either claim 2 or claim 3, characterised in that the sheet metal strip from which the bushing (34) is formed is continuously closed.

5. Electrically conductive screw connection according to either claim 2 or claim 3, characterised in that the sheet metal strip from which the bushing (34′

) is formed is wound and the ends butt loosely in front of one another.

6. Electrically conductive screw connection according to either claim 2 or claim 3, characterised in that the sheet metal strip from which the bushing (34′

) is formed is wound and the ends are connected by means of dovetailing or simple guiding.

7. Electrically conductive screw connection according to claim 2, 3, 4, 5 or 6, characterised in that the bushing (34;

34′

) is provided in the region of the corrugation peaks (40) with stamped contact claws (44) or with embossed studs or with a cross-knurl or transverse knurl.

8. Electrically conductive screw connection according to claim 2, 3, 4, 5 or 6, characterised in that the surface of the bushing (34;

34′

) is at least partially corrugated or roughened.

9. Electrically conductive screw connection according to any of claims 1 to 8, characterised in that the portion (15) of the bore (14) having the enlarged internal diameter is arranged on the side of the one part (10) facing the screw head (18).

10. Electrically conductive screw connection according to claim 9, characterised in that the other part (12) has a hole (11) for the passage of the screw (16) of which the internal diameter is greater than the external diameter of the bushing (34;

34′

).

11. Electrically conductive screw connection according to claim 9, characterised in that the bushing (34;

34′

) is attached directly below the screw head so as to be rotatable but non-detachable on the shank (22) of the screw (16).

12. Electrically conductive screw connection according to claim 11, characterised in that, for installation of the bushing (34;

34′

), the shank (22) of the screw (16) is provided above the external thread (24) with a radial circumferential bead (32), of which the external diameter is less is than the enveloping circle of the bushing (34;

34′

).

13. Electrically conductive screw connection according to claim 12, characterised in that the circumferential bead (32) is chamfered towards the external thread (24) of the screw (16) so that the bead (32) merges into the external thread (24) as the height decreases.

14. Special bushing for low-resistance connection of a screw (16) to a workpiece (10) into which the screw (16) is inserted, characterised in that the bushing (34;

34′

) is formed from a corrugated sheet metal strip of which the corrugations (40, 42) are arranged parallel to the axis of rotation of the bushing (34).

15. Special bushing according to claim 14, characterised in that three corrugation peaks (40) and three corrugation troughs (42) are arranged over a circumference of the bushing (34;

34′

).

16. Special bushing according to either claim 14 or claim 15, characterised in that the sheet metal strip from which the bushing (34) is formed is continuously closed.

17. Special bushing according to either claim 14 or claim 15, characterised in that the sheet metal strip from which the bushing (34′

) is formed is wound and the ends butt loosely in front of one another.

18. Special bushing according to either claim 14 or claim 15, characterised in that the sheet metal strip from which the bushing (34′

) is formed is wound and the ends are connected by means of dovetailing or simple guiding.

19. Special bushing according to claim 14, 15, 16, 17 or 18, characterised in that the bushing (34;

34′

) is provided in the region of the corrugation peaks (40) with stamped contact claws (44) or with embossed studs or with a cross-knurl or transverse knurl.

20. Special bushing according to claim 14, 15, 16, 17 or 18, characterised in that the outer surface of the bushing (34;

34′

) is at least partially corrugated or roughened.