Plug connector

1. A plug connector for cooperation with a socket connector, comprising:

a plug housing for accommodating terminal means,

a cover for closing the plug housing, and

a CPA member for locking the connectors when mated;

the plug housing being formed with

a body portion,

a cylindrical plug projection and

a pair of latch arms;

the cylindrical plug projection having a hollow for accommodating portions of the CPA member, a pair of recesses facing the latch arms, and a pair of cross ribs;

the latch arms, each having a lug at its end for cooperation with an appropriate groove in the socket connector;

the CPA member comprising

a pair of locking legs and

a pair of spring arms, each having a free end lug and a nose which projects inwardly and is arranged in a predetermined distance from a spring arm end surface so that, when the CPA member and the plug connector are in a pre-locked position, the spring arm end surface is engaged by a flat upper surface of the cross ribs and the nose takes a short distance to a support surface, and when there are loads well in excess of mating force onto the CPA member in this condition, the noses make a stop on the support surface to keep the CPA member in the pre-locked position, whereas when the plug connector and the socket connector are in a pre-mounted position and there is a mating operation onto the plug connector and the CPA member, the free end lugs of the spring arms cooperate with inner walls of the socket connector to straddle the spring arms and keep the noses free from the support surface so as to allow the lugs getting past the respective cross ribs and to mate the plug connector with the socket connector.

2. The plug connector of claim 1 , wherein the nose has a stop surface which extends perpendicularly to the insertion direction of the CPA member in the plug connector, or slopes inwardly relative to the plug connector, the stop surface, which extends perpendicularly to the insertion direction or slopes inwardly relative to the plug connector, in case of an excessive load onto the CPA member, cooperating with the supporting surface of the body portion.

3. The plug connector of claim 1 , wherein each free end lug forms a flat end surface of the spring arms for resting upon the respective cross rib, the free end lugs also comprising cam surfaces which cooperate with inner walls of the socket connector and with the cross ribs, respectively, when mating and unmating the connectors.

4. The plug connector of anyone of claim 1 , wherein the cross ribs are arranged between respective parallel walls in the hollow of the plug projection.

5. The plug connector of claim 4 wherein each cross rib is split to form a gap therebetween which offers a frictional passage for the respective free end lug of the respective spring arm when an excessive force is placed upon the CPA member.

6. The plug connector of anyone of claim 1 , wherein each spring arm between the nose and the free end lug has a contour that encompasses the inner wall top ends of the socket connector.

7. The plug connector of claim 6 wherein the latch arms have a first length and the spring arms have a second length longer than the first length so that in the mated condition of the connectors, the free end lug of each spring arm extends deeper in the socket connector than does the end lug of each latch arm.

8. The plug connector of anyone of claim 1 , wherein the locking legs of the CPA member each has a guiding leg portion, a locking leg portion and a slanting step therebetween, the guiding leg portions clamping the CPA member between casing walls of the plug housing.

9. The plug connector of anyone of claim 1 , wherein the CPA member includes a plate defining a plate plane that extends perpendicularly to the insertion direction of the CPA member and wherein guiding walls defining a guiding plane and the spring arms extend parallel to one another and depend from said plate in a direction parallel to the insertion direction, the pairs of locking legs defining parallel leg planes which extend perpendicularly to the guiding plane of the guiding walls.

10. The plug connector of claim 9 , wherein the plate of the CPA member is basically rectangular having two pairs of opposed sides, one side pair, where the locking legs depend from the plate, being extended with grip rims, the other side pair being provided with the guiding walls and an actuator leg, respectively, which depend from opposed sides of the plate.

11. A plug connector for cooperation with a socket connector, comprising:

a plug housing for accommodating terminal means,

a cover for closing the plug housing, and

a CPA member for locking the connectors when mated;

the plug housing being formed with

a body portion,

a cylindrical plug projection and

a pair of latch arms;

the cylindrical plug projection having a hollow for accommodating portions of the CPA member, a pair of recesses facing the latch arms, and a pair of cross ribs; each cross rib is split to form a gap therebetween;

the latch arms, each having a lug at its end for cooperation with an appropriate groove in the socket connector;

the CPA member comprising

a pair of locking legs and

a pair of spring arms, each having a free end lug so that, when the CPA member and the plug connector are in a pre-locked position and when an excessive force is placed upon the CPA member said free end lugs push against the split cross ribs and deflecting them further apart and providing a frictional passage permitting the spring arms to pass into the gap without damage.

12. The plug connector of claim 11 wherein said socket connector includes an insert housing; and said cross ribs are prevented by said insert housing from deflecting apart to permit passage of the spring arms during the mating process.