Patent Application
20140363987
The present invention relates to an electrical connector, more specifically to a connector suitable for use in applications with higher mating cycles.
Connectors are commonly provided for applications where cycle times are low. For example, many input/output (IO) connectors are expected to undergo relatively few mating cycles. Certain applications, however, require substantially more mating cycles. Portable electronic devices, such as laptops and cellular phones for example, may undergo multiple mating cycles a day due to their power requirements. Similarly, medical devices may require at least one, if not more, mating cycles a day. Over a two year or three period this can cause a connector to experience more than 1000 mating cycles.
Existing, somewhat standards methods of addressing the need for a connector to survive a higher number of mating cycles have been to use more durable (and often more expensive) platings or wider contact areas. This becomes problematic, however, when viewed in light of the constant pressure to provide smaller devices and reduce costs. Magnetic interfaces have also been contemplated. For example, US Publication No. 2010/0197148 discloses the concept of providing a magnetic in a pocket, the magnet configured to press a flex circuit so that the flex circuit makes electrical connection with contact on an opposing side of the mating interface. In addition, certain designs have suggested the simple use of a magnet connection between two stationary contacts. Neither design, however, is particularly suitable for an application where one housing engages a second housing in a sliding manner. Therefore, certain individuals would appreciate further improvements to connectors suitable for high mating cycles.
A connector includes a housing and a terminal supported by the housing. The terminal includes an aperture positioned adjacent a pocket. Positioned in the pocket is a ball. When the connector is positioned adjacent a magnetic attraction element provided by a mating connector, the ball is attracted to the magnet attraction element and configured to partially extend through the aperture so as to engage a contact on an opposing connector, thus providing an electrical connection between the terminal and the contact.
The organization and manner of the structure and operation of the invention, together with further objects and advantages thereof, may best be understood by reference to the following description, taken in connection with the accompanying drawings, wherein like reference numerals identify like elements in which:
While the invention may be susceptible to embodiment in different forms, there are shown in the drawings, and herein will be described in detail, certain embodiments with the understanding that the present disclosure is to be considered exemplary and is not intended to limit the invention to that as illustrated and described herein. Therefore, unless otherwise noted, features disclosed herein may be combined together to form additional combinations that were not otherwise shown for purposes of brevity. The terms top, bottom, upper, lower and the like are used herein for convenience in describing the present invention and do not denote a required orientation during use.
As depicted, a power connector 20 includes a pair of connectors 22, 24 which are mated together via a dielectric housing 26. The connectors 22, 24 can be used to transmit power or signals, as desired. Features on the connector 22 are configured to provide for the ability to have a high number of mating cycles with connector 24 while providing an effective electrical connection. It should be noted that many other housing configurations are possible while still providing the benefits depicted.
The dielectric housing 26,
A cavity 42 is formed in the housing 26 and has a first entrance opening 44 and a second entrance opening 46. The cavity 42 is defined by the rear surface of the front wall 36, the inner surface of the side walls 32, 34 the front surface of the rear wall 38 and the upper surface of the lower walls 30a, 30b. The first entrance opening 44 corresponds in size to a side of the cavity 42 and is defined by the rear edge of the front wall 36, the lower edge of the side wall 32, the front edge of the rear wall 38 and the upper edges of the lower walls 30a, 30b. The second entrance opening 46 is provided by the space between the bottom walls 30a, 30b. The second entrance opening 46 is smaller than the first entrance opening 44. Connector 24 is insertable into the cavity 42 as discussed herein. An elongated protrusion 48 extends forwardly from the front surface of the rear wall 38 along its width. The protrusion 48 forms a key which mates with a corresponding keyway 50 on the connector 24 as described herein. The protrusion 48 is preferably arched, however, it may be linear.
A pair of slots 52, 54 are provided through the upper wall 28 and are in communication with the cavity 42. A passageway 56 is formed through the thickened front wall 36 and is in communication with the cavity 42. The front edge of the passageway 56 forms an entrance opening 57 which is perpendicular to the entrance opening 44. The upper and lower surfaces of the passageway 56 are preferably arched and preferably taper inwardly from the front end of the passageway 56 to the rear end of the passageway 56. If desired, the side surfaces of the passageway 56 may taper inwardly from the front end of the passageway 56 to the rear end of the passageway 56. The passageway 56 is smaller in width than the cavity 42. Connector 22 is insertable into the passageway 56 as discussed herein.
Connector 22,
A protrusion 72 extends upwardly from the upper wall 58 at its rear end. The protrusion 72 has a chamfered surface 74 along its rear end and is capable of being inserted into slot 52 when the connector 22 is mounted in the housing 24. The rear wall 66 has a plurality of spaced apart mounting flanges 76 extending perpendicularly therefrom and forwardly from its front surface into the cavity 68. A slot 78 is provided through the rear wall 66 directly above each mounting flange 76. A recess 79 is provided in the rear surface of rear wall 66 directly below each slot 78. A pocket 80 is provided in the center of the first recess 79.
A ball 82,
A terminal 84 is mounted through each slot 78 and abuts against the respective mounting flange 76 and the rear surface of the rear wall 66. As depicted, each terminal 84 includes an upper leg 86 connected to a lower leg 88. The lower leg 88 of each terminal 84 can be perpendicular to the upper leg 86. Each lower leg 88 has an aperture 90 provided therethrough. Respective terminals 84 are mounted in respective slots 78 such that the upper leg 86 extends through the slot 78 and sits on its associated mounting flange 76, and the lower leg 88 is seated within the respective first recess 79 and covers the associated pocket 80. The ball 82 rests in the pocket and can partially extend through the aperture 90, but cannot completely pass therethrough. As a result, the balls 82 are trapped in the second recesses 80 by the lower legs 88. Each upper leg 86 is depicted as including a retention feature 91 for engaging the front surface of the rear wall 66 to prevent the removal of the terminals 84 once attached to the connector 24.
Connector 24,
The connector 24 has a flexible circuit 110 provided therein. The flexible circuit 110 commences at the front surface 96 of the upper wall 94, extends through the connector 24 and exits the lower surface 112 of the lower wall 92. The flexible circuit 110 has a plurality of contact pads 114, shown as three in
To assemble the connectors 22, 24 with each other and with the housing 26, connector 22 is first inserted into the housing 26 by inserting the rear end of the connector 22 into the passageway 56 and pushing the connector 22 into the housing 26 until the protrusion 72 enters into the slot 52 in the top wall 28. The balls 82 may partially extend into the cavity 42.
Next, the connector 24 is slid into the cavity 48 with the rounded or chamfered corners 108 of the upper wall 94 entering through the first entrance opening 44 and into the cavity 48 and the second wall 92 entering through an end of the second entrance opening 46 and into the second entrance opening 46. The second wall 92 extends downwardly from the second entrance opening 46. The protrusion 48 on the housing 26 mates with the keyway 50 on the connector 24 to ensure that the connector 24 is inserted in the proper direction into the housing 26. Once the front wall 96 engages the balls 82, the balls 82 roll along front wall 96 of the connector 24. This reduces wear on the contact pads 114 since the rolling action of the balls 82 minimizes the frictional wear between the connectors 22, 24 during mating and during separation of the connectors 22, 24. Since the walls 28, 30a, 30b of the housing 26 and the walls 100, 102a, 102b of the connector 24 are arched, the connector 24 pivots around a centerpoint of the housing 26 as it is inserted therein.
When the connector 24 is completely inserted into the housing 26, the magnetic attraction member 116 attracts the ball 82 which causes the ball 82 to engage the conductive pad 114 to complete the electrical connection between the terminal 84 and the conductive pad 114. If necessary, the second legs 88 of the terminals 84 can flex away from the rear wall 66 of the connector 22 to compensate for any tolerances between the terminal 84 and the conductive pad 114, which is expected to be stationary, result from manufacturing and/or design constraints. Therefore, power can flow from a source (not shown) through the contact pads 114, through the conductive balls 82, and through the terminals 84 so as to allow for an electrical connection that can be reliably made. The conductive coating on the balls 82 reduces electrical resistance and improves conductivity.
As can be appreciated, the ball 82 can be one of magnetic or ferrite based and the plate 116 can be the other. In addition, it is to be understood that both can be magnetic based. While a flexible circuit 110 is described as supporting the contact pad 114, the contact pad can readily be provided by a convention terminal.
While the protrusion 48 is shown on the housing 26 and the keyway 50 is shown on the connector 24, the positions of these components can be reversed. Also, while the connectors 22, 24 and the housing 26 are shown with arched walls, the walls can be flat, if desired.
Turning to
It should be noted that in an embodiment the contact 135 is supported by a member 130, which could be positioned on a housing (not shown). The contact 135 could be a second terminal supported by an insulative housing with a magnetic attraction member 150 positioned adjacent the contact 135. For example, the contact could be a copper-based terminal with a plating. Alternatively, the magnetic attraction member 150 could be used as the terminal (thus combining the contact and the magnet attraction member) and could be plated to help prevent corrosion on the surface of the magnetic attraction member 150. As can be appreciated, the magnetic attraction member 150 can be a ferrite-based substance if the ball 190 is magnetic or the magnetic attraction member 150 could be magnetic if the ball 190 was ferrite-based. In addition, both the ball 190 and the magnetic attraction member 150 could be formed of magnetic material if desired.
To help ensure the electrical connection between the terminal 180 and the contact 135 is maintained, the ball 190 presses against the finger 185 and deflects it when the ball 190 moves toward the contact 135. In this way, tolerances between the terminal 180 and the contact 135 are accounted for. Of course, as noted above, the terminal 180 could also deflect toward the contact to account for possible tolerances. Alternatively, the first and second terminal could be manufactured such that tolerances were not an issue. However, it is generally expected that such careful manufacturing would be overly expensive and therefore having some degree of flexibility to ensure tolerances are managed is desired. It can be beneficial to have the pocket sized so that the ball is kept in close proximity to the aperture.
It should be noted that the connector system is suitable for use in a wide range of configurations. For example, a sliding engagement between the first and second connector is not required unless otherwise noted.
While certain embodiments are shown and described, it is envisioned that those skilled in the art may devise various modifications without departing from the spirit and scope of the appended claims.
This application claims priority to U.S. Provisional Application No. 61/486,094, filed May 13, 2010, which is incorporated herein by referenced in its entirety.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/US12/37781 | 5/14/2012 | WO | 00 | 8/20/2014 |
| Number | Date | Country | |
|---|---|---|---|
| 61486094 | May 2011 | US |
