| 摘要 |
<p>PURPOSE:To prevent a one-side lock and weight increasing and to make the increase of an overstroke for a both-side lock unnecessary by providing a part to be a slant face at an engaging part with the pair of stopper members of a pair of lock members. CONSTITUTION:Slant face parts 103 and 104 to have slant faces 101 and 102 are provided at an engaging parts 16a and 17a with stopper members 18 and 19 of lock arms (lock members) 16 and 17. Consequently, when a lock becomes an unlocked condition, a stopper lever lower edge 18a is abutted on the slant face 101 of the slant face part 103, and when the lock arm 16 is going to float by reaction force P, it receives a drag N of a vertical direction to the slant face 101. Then, an angular moment M is generated, and the lock arm 16 rotates in a lock canceling direction. Consequently, when the one side of the left and right locks becomes the unlocked condition, also the other side of the lock is canceled. Thus, a lock mechanism which is not one-side locked, is light and has a little over stroke for a both-side lock can be obtained.</p> |
