Terminal accommodating chamber

The side walls 1 have a provisional engagement groove 6 formed at the rear portion thereof and a full engagement projection 7 at the front portion thereof.The side walls also have a guide groove 8 extending longitudinally.5b showing the terminal locking block provisionally engaged with the connector housing, and FIG. 6a showing the terminal locking block provisionally engaged with the connector housing, FIG. 6c showing the terminal lug disengaged by the jig; FIG. 8a showing the terminal lug being inserted into the connector housing and FIG. The connector housing A has terminal accommodating chambers 3 formed between side walls 1 on each side and an intermediate wall 2.

The stopper permits insertion of the terminal lugs into the terminal accommodating chambers when the terminal locking block is in the provisional engagement position.The terminal locking block is mounted to the connector housing in two steps, first in a provisional engagement condition and then in a full engagement condition.In the provisional engagement condition, a stopper formed at the rear inside of the terminal locking block stays out of terminal insertion passages, allowing terminal lugs to be inserted into the terminal accommodating chambers, in which the terminal lugs are held by resilient engagement pieces of the connector housing.Then the terminal locking block B is advanced forwardly to connect the full engagement holes 12 with the full engagement projections 7 to assume a fully engaged condition (FIG. In this state, the stopper 11 is positioned immediately behind a protrusion 14 of the terminal lug C, thus preventing the terminal lug C from slipping off backwardly (FIG. The backward slip-off of the terminal lug is therefore doubly blocked by the resilient engagement piece 5 and the stopper 11. 3 and 4, a restraining projection 15 is provided to the front inner side of the main plate portion 9 of the terminal locking block B'. From this state the terminal locking block B' is pressed down and advanced into the full engagement state (FIG. At this time, the restraining projection 15 prevents the resilient engagement piece 5 from being displaced excessively to protect it from damage (FIG. Pushing down the terminal locking block B" from the provisional engagement condition (FIG. 6a) immediately sets it into the full engagement condition (FIG. In the provisional engagement condition, the terminal lug C can be disengaged from the resilient engagement piece 5 by lifting the latter using the jig T (FIG. The construction and advantages of this invention may be summarized as follows.

In a provisionally engaged condition in which the provisional engagement projections 13 of the terminal grooves 6 of the connector housing A', the restraining projection 15 stays above the resilient engagement pieces 5 with a gap therebetween (FIG. The terminal locking block is connected to the connector housing containing terminal accommodating chambers in two steps, by first setting the block to a provisional engagement position and then to a full engagement position.

Furthermore, the attaching of the terminal locking block f to the connector housing a is not an easy work. 9, when a jig i is used to force up the resilient engagement piece d to disengage the terminal lug e and pull it back from the connector housing, the assembly worker may easily pry open the resilient engagement d excessively as shown by a broken line, which may result in breakage.