Electrical connection device

1. An electrical connection device to be attached to a wiring board for holding a plate conductive member so that the wiring board is electrically connected to the plate conductive member, comprising:

a contact piece including an arm portion, a leg portion, and a base portion disposed between the arm portion and the leg portion; and

a base member to be attached to the wiring board for supporting the contact piece at the base portion thereof,

wherein said base member is to be attached to the wiring board so that the base member is movable in parallel to the wiring board, and

said contact piece is arranged so that the plate conductive member pushes the arm portion to urge the leg portion against the wiring board with the base portion as a pivot when the plate conductive member contacts with the arm portion.

2. The electrical connection device according to claim 1 , wherein said arm portion is formed to extend along the plate conductive member when the electrical connection device holds the plate conductive member,

said leg portion is formed to extend along the wiring board when the electrical connection device is attached to the wiring board, and

said arm portion includes a contact point protruding toward the plate conductive member when the electrical connection device holds the plate conductive member.

3. The electrical connection device according to claim 1 , wherein said contact piece includes a first contact piece and a second contact piece arranged to face each other,

said first contact piece includes a first arm portion, a first leg portion, and a first base portion disposed between the first arm portion and the first leg portion,

said first contact piece further includes a first contact point formed on the first arm portion,

said second contact piece includes a second arm portion, a second leg portion, and a second base portion disposed between the second arm portion and the second leg portion,

said second contact piece further includes a second contact point formed on the second arm portion so that an insertion opening is formed between the first contact point and the second contact point for inserting the plate conductive member,

said insertion opening has a size smaller than a thickness of the plate conductive member,

said first contact piece is arranged so that the plate conductive member pushes the first arm portion to urge the first leg portion against the wiring board with the first base portion as a pivot when the plate conductive member contacts with the first arm portion, and

said second contact piece is arranged so that the plate conductive member pushes the second arm portion to urge the second leg portion against the wiring board with the second base portion as a pivot when the plate conductive member contacts with the second arm portion.

4. The electrical connection device according to claim 3 , further comprising a pressing member disposed between the first base portion and the second base portion.

5. The electrical connection device according to claim 4 , wherein said first contact piece further includes a first engaging hole,

said second contact piece further includes a second engaging hole,

said pressing member includes a first engaging portion, and

said base member includes a second engaging portion passing through the first engaging hole to engage with the first engaging portion.

6. The electrical connection device according to claim 5 , wherein said first engaging hole is formed to extend in a width direction of the first contact piece, and

said second engaging hole is formed to extend in a width direction of the second contact piece.

7. The electrical connection device according to claim 3 , further comprising a cover member for covering at least a part of the first contact piece and a part of the second contact piece.

8. The electrical connection device according to claim 1 , wherein said base member is formed of a metal material.