Locking device for spade-type electrical connectors

A locking device for maintaining electrical connection in spade-type connectors comprising:

• a case and an insert, telescoping at least partially thereinto, both being interconnectable by a single, centrally-located attaching means, said case comprising opposed sidewalls and a top and bottom wall, thereby defining a rectangular box, said box containing upstanding wedges in opposed relationship to form a constriction;
• the distance between the wedges, when measured diagonally is greater than the width of the spade member of a spade connection, and the distance, when measured transversely, is less than the width of said spade member to thereby engage the rear edges of a spade member inserted into said case through a first end opening to prevent the spade member's withdrawal from said case;
• said case further having a flexible tongue integral with said bottom wall at a first end, said tongue having located at its free end a projection forming a part of said attaching means;
• and
• said insert comprising opposed sidewalls and top and bottom walls, thereby defining a rectangular box of slightly smaller dimensions than said box of said case, thereby permitting said insert to be partially telescoped into said case, said insert further comprising inwardly projecting detents integral with the top wall thereof to engage a spade-receiving member of a spade connection inserted into said insert through a first end opening to likewise prevent its withdrawal from said insert, said insert further comprising a wall extending parallel to and equidistant from said opposed sidewalls to divide said insert into two compartments, each having one of said detents projecting from said top wall downwardly thereinto, said top wall further including an upwardly convoluted portion adjacent a first end to accommodate the connection of a wire to said spade-receiving member;
• said insert being insertable into said case to cause said wedges and detents, respectively, to hold said spade portions and said spade-receiving portions in electrical connection when said projection is hooked behind said first end of said insert.