Over-center toggle latch with integral safety switch

An over-center toggle latch for securing two members together, said latch comprising:

• (h) a latch housing adapted for being affixed to one of the members;
• (i) a keeper having a base portion adapted for being affixed to the other of the members, having a dog projection connected to said base portion and extending therefrom, said dog projection adapted for being received within said housing and retained therein when the latch is in a closed position and released when the latch is in an opened position;
• (c) a toggle member, pivotally mounted within said housing for pivotal movement between a first position, to receive said dog projection, and a second position in overlying disposition to said dog projection and in sandwich orientation to said base portion and said dog projection, whereby said dog projection is retained within said housing;
• (d) retaining means disposed within said housing and in pivotal contact with each of said housing and said toggle member for retaining said toggle member in said first and second positions, said retaining means comprising a first guide member and a second guide member in telescopic relation to said first guide member, said first guide member having a body portion and a head portion, said head portion having a generally convex outer surface in pivotal sliding engagement with a generally concave surface on said toggle member, said second guide member having a body portion and a head portion, said head portion having of said second guide member having a generally convex outer surface in pivotal sliding contact with an inner wall of said housing, and a coil spring disposed about said body portions of said first guide member and contacting said head portions of said first and second guide members, said coil spring comprising means for urging said guide members apart and for urging said head portions into contact with said toggle member and said housing wall;
• (e) wherein said base portion of said keeper comprises means for pivoting said toggle member from said first position to said second position upon the closing of said latch;
• (f) wherein said dog projection of said keeper comprises means for pivoting said toggle member from said second position to said first position upon the opening of said latch;
• and
• (g) wherein said dog projection of said keeper is disposed between said toggle member and said retaining means when said latch is in a closed position, and
• (h) a switch operable between a closed position and an open position wherein a circuit is closed only when said toggle means is in said second position and the circuit is open only when said toggle means is in said first position, said switch being inoperable until said keeper means is fully inserted into said housing;
• whereby the latch contains the switch requiring the latch to be in the latched position to complete the circuit such that accidental closing of the circuit is avoided.