Electrical contact having cleaning system

Patent metadata

Field	Value
Publication number	US-9698512-B2
Application number	US-201615192003-A
Country	US
Kind code	B2
Filing date	Jun 24, 2016
Priority date	Jun 25, 2015
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

Embodiments disclose an electrical contact including a metal housing and a fixed contact part, which is attached to the metal housing and has a contact surface that, during the attachment, is located within the metal housing, and a contact tab located outside the metal housing. The electrical contact includes a movable contact part, which can be inserted into the metal housing to form an electrical contact together with the contact surface of the fixed contact part. A cleaning system is provided in that at least one scraping edge is provided adjoining the contact surface, the movable contact part making contact with said scraping edge during insertion. A surface of the movable contact part passes over the scraping edge to remove possible dirt particles.

First claim

What is claimed is:

1. An electrical contact, comprising:
a metal housing;
a fixed contact part attached to the metal housing, the fixed contact part having a contact surface located within the metal housing and a contact tab located outside the metal housing; and
a movable contact part configured to be inserted into the metal housing to form an electrical contact with the contact surface of the fixed contact part;
wherein a surface of at least one of the fixed contact part or the movable contact part establishing the electrical contact forms a profile having low-profile portions, high-profile portions, and scraping edges formed between the low-profile and high-profile portions, and
wherein the scraping edges are angled less than 90° with respect to an insertion direction of the movable contact part into the metal housing, the scraping edges defining a plurality of rhombi.

2. The electrical contact according to claim 1 , wherein the scraping edges form an angle of 15 to 45° with respect to an insertion direction of the movable contact part into the metal housing.

3. The electrical contact according to claim 1 , wherein the plurality of rhombi have a larger length than width with respect to the insertion direction of the movable contact part into the metal housing.

4. The electrical contact according to claim 1 , wherein the profile is disposed on the contact surface of the fixed contact part.

5. The electrical contact according to claim 4 , wherein the fixed contact part further includes chamfers on narrow sides of the profile and debarred edges on broad sides of the profile.

6. The electrical contact according to claim 1 , wherein the profile is generated by embossing and stamping the contact part, and the love-profile portions of the profile have a smaller surface area than the high-profile portions.

7. The electrical contact according to claim 1 , further comprising: a cleaning lip located near the contact surface, the cleaning lip being configured to make contact with the movable contact part during insertion.

8. The electrical contact according to claim 7 , further comprising:
a dirt reservoir adjoining the cleaning lip, the dirt reservoir being configured to collect dirt particles during a relative movement between the fixed contact part and the movable contact part.

9. The electrical contact according to claim 7 , further comprising:
a connector housing enclosing the metal housing, the connecting housing having an opening for receiving the movable contact part, and wherein the cleaning lip is attached to the opening and configured to scrape off dirt particles when making contact with the surface of the movable contact part.

10. The electrical contact according to claim 9 , wherein the cleaning lip is made of a softer material than the connector housing, and the cleaning lip has a chamfered upper face downwardly sloping into the interior of the connector housing.

11. The electrical contact according to claim 7 , wherein the cleaning lip includes an opening for accessing the metal housing.

12. The electrical contact according to claim 9 , further comprising:
a dirt reservoir disposed between the end face of the fixed contact part and the connector housing, the dirt reservoir being configured to collect the scraped dirt particles.

13. The electrical contact according to claim 1 , further comprising:
a connector housing enclosing the metal housing;
a first latching device on an upper face of the metal housing; and
a second latching device on a lower face of the metal housing;
wherein the first and second latching devices are configured to secure the metal housing within the connector housing.

14. The electrical contact according to claim 1 , wherein the metal housing is box-shaped and lateral walls of the metal housing have cut-outs formed therein for attaching the fixed contact part to a lower face of the metal housing.

15. The electrical contact according to claim 1 , further comprising:
a leaf spring disposed in an interior of the metal housing, the leaf spring being configured to generate a pressing force between the contact parts.

16. The electrical contact according to claim 15 , further comprising:
a movable locking pin;
wherein:
the metal housing has a concave portion protruding into the housing interior for establishing a starting position and an end position of the movable locking pin, and
the end position is configured to lock the leaf spring in a pressured position to secure the contact parts to each other.

17. The electrical contact according to claim 1 , wherein the fixed contact part is a flat stamping having catch lugs on side regions, the side regions being configured to secure the fixed contact part to the metal housing.

18. The electrical contact according to claim 1 , wherein:
the contact parts are made of copper;
the surfaces of the contact parts are coated with silver; and
the metal housing is made of steel.

19. The electrical contact according to claim 1 , wherein a second dirt reservoir is formed between the low-profile and high-profile portions.

20. The electrical contact according to claim 19 , wherein the second dirt reservoir has a width of 0.2 to 1 mm.

21. The electrical contact according to either claim 19 , wherein the second dirt reservoir has a depth of 0.3 to 1.2 mm.

22. The electrical contact according to claim 19 , wherein the second dirt reservoir is formed by multiple gaps dividing the profile in a rectilinear manner, and the second dirt reservoir has sharp edges with respect to the contact surface.

Assignees

• Draexlmaier Lisa Gmbh

Inventors

• Saller Robert
• Zhang Xiayuan

Classifications

• H01R13/113 Primary

  co-operating with pins or blades having a rectangular transverse section · CPC title

• H01R13/46

  Bases; Cases · CPC title

• H01R13/11 Primary

  Resilient sockets (carrying separate resilient parts H01R13/15) · CPC title

• H01R13/193

  Means for increasing contact pressure at the end of engagement of coupling part {, e.g. zero insertion force or no friction} · CPC title