A coupling unit has an electrical-connector for push-fit electrical connection in the coupling unit axial direction to a mating electrical-connector of a unit. The electrical-connector and mating electrical-connector have engagement formations permitting push-fit connection only when the electrical-connector is in predetermined rotational alignment about axial direction with the mating electrical-connector. The coupling unit has a backshell in fixed rotational relationship with the electrical-connector and extending rearwardly therefrom to house, in use, one or more leads extending rearwardly from the electrical-connector. The coupling unit has coaxial actuation sleeve surrounding the backshell. The actuation sleeve axially moves to effect push-fit connection. The backshell and actuation sleeve are operatively connected so: actuation sleeve movement in forward axial direction towards the unit is resisted by electrical-connector contact with the mating electrical-connector to produce backshell rotation, thereby aligning the electrical-connector with the mating electrical-connector and allowing push-fit connection of the electrical-connector to the mating electrical-connector.

The utility model discloses an electrical connector for Christmas lamp trees which comprises an upper and a lower connecting base, first columnar electrodes and elastic devices are arranged in the upper connecting base, second arc-shaped electrodes are arranged in the lower connecting base, and the elastic devices cause the first electrodes to tightly abut against the second electrodes. The first columnar electrodes and the second arc-shaped electrodes form a point-to-surface contact, so that the reliability of electrical connection is increased greatly, allowing a Christmas lamp tree to be universal to high and low voltages. Moreover, sufficient contact between upper and lower layers and natural effect of the Christmas lamp tree can still be ensured even if the Christmas lamp tree is subjected to an external force, and multiple sets of first and second electrodes are electrically connected in one-to-one correspondence, leading to diversified functions of the Christmas lamp tree.

The utility model discloses an electrical connector for Christmas lamp trees which comprises an upper and a lower connecting base, first columnar electrodes and elastic devices are arranged in the upper connecting base, second arc-shaped electrodes are arranged in the lower connecting base, and the elastic devices cause the first electrodes to tightly abut against the second electrodes. The first columnar electrodes and the second arc-shaped electrodes form a point-to-surface contact, so that the reliability of electrical connection is increased greatly, allowing a Christmas lamp tree to be universal to high and low voltages. Moreover, sufficient contact between upper and lower layers and natural effect of the Christmas lamp tree can still be ensured even if the Christmas lamp tree is subjected to an external force, and multiple sets of first and second electrodes are electrically connected in one-to-one correspondence, leading to diversified functions of the Christmas lamp tree.

A one-way connection system with a female connection element having a female contact mounted at one end of a first electrical cable, and a male connection element having a male contact mounted at one end of a second electrical cable. The system further includes a central unitary module with a longitudinal through-hole configured to receive the male connecting element on a first surface and the female connecting element on a second surface so that the male contact of the male connection element is aligned with the female contact of the female connection element to make an electrical connection between the two connection elements.

A one-way connection system with a female connection element having a female contact mounted at one end of a first electrical cable, and a male connection element having a male contact mounted at one end of a second electrical cable. The system further includes a central unitary module with a longitudinal through-hole configured to receive the male connecting element on a first surface and the female connecting element on a second surface so that the male contact of the male connection element is aligned with the female contact of the female connection element to make an electrical connection between the two connection elements.

Provided is a first plug connector which is constructed to be connected at its first end to a first electrical component and at its second end to second plug connector, which is complementary to the first plug connector. The first plug connector enfolds at least one first part of a bayonet-like connection and at least a first locking element for a locking mechanism, which is arranged in such a way, that it extends in the plugging direction. Furthermore, a second plug connector complementary to the first plug connector and able to be connected to it and a comprehensive plug connector arrangement are provided.

Provided is a first plug connector which is constructed to be connected at its first end to a first electrical component and at its second end to second plug connector, which is complementary to the first plug connector. The first plug connector enfolds at least one first part of a bayonet-like connection and at least a first locking element for a locking mechanism, which is arranged in such a way, that it extends in the plugging direction. Furthermore, a second plug connector complementary to the first plug connector and able to be connected to it and a comprehensive plug connector arrangement are provided.

There is provided an electrical connection device (100) including a male portion including a head (21) having a groove for insertion of a driver, and a body portion (24) having a spirally penetrating first guide hole (26a) formed from a lower end and a second guide hole (26b); a female portion (116) having a hole portion (118) into which the body portion (24) is inserted; an elastic portion (40) to be disposed on an outer circumference of the body portion (24) when the body portion (24) is inserted into the hole portion (118); and a movable body (30) which is disposed below the elastic portion, and engages and penetrates through the first guide hole (26a) when the body portion (24) is inserted into the hole portion (11), in which a first conductive member (50) and a second conductive member (60) are interposed between an upper end of the elastic portion (40) and the head (21), and with the movable body (30) engaged in the first guide hole (26a), as the head (21) rotates to a predetermined rotation angle relative to the hole portion (118), a biasing force of the elastic portion (40) is increased due to a rise of the movable body (30) in contact with a lower end of the elastic portion (40), and when a rotation angle of the head (21) relative to the hole portion (118) exceeds the predetermined rotation angle, the movable body (30) engages in an end portion (29) of a second guide hole (26b) leading to the first guide hole (26a), the second guide hole being provided in a direction in which the biasing force is reduced, to suppress rotational movement of the movable body (30) relative to the body portion (24).

Provided is a first plug connector which is constructed to be connected at its first end to a first electrical component and at its second end to second plug connector, which is complementary to the first plug connector. The first plug connector enfolds at least one first part of a bayonet-like connection and at least a first locking element for a locking mechanism, which is arranged in such a way, that it extends in the plugging direction. Furthermore, a second plug connector complementary to the first plug connector and able to be connected to it and a comprehensive plug connector arrangement are provided.

Provided is a first plug connector which is constructed to be connected at its first end to a first electrical component and at its second end to second plug connector, which is complementary to the first plug connector. The first plug connector enfolds at least one first part of a bayonet-like connection and at least a first locking element for a locking mechanism, which is arranged in such a way, that it extends in the plugging direction. Furthermore, a second plug connector complementary to the first plug connector and able to be connected to it and a comprehensive plug connector arrangement are provided.