Patent ID: 7909218
Filing Date: 2011-03-22
Classification: B25C

Abstract:
1. A safety apparatus for a stapler having a power spring for storing energy as well as urging a driving blade to expel a staple upon releasing the stored energy, the safety apparatus comprising: a lock plate holding up the power spring for storing energy when in a first position, and releasing the power spring when the lock plate being moved substantially horizontally to a second position; a safety pin substantially vertically movable between a third and fourth position, the safety pin being in the third position when the stapler is not pressed against an object for being stapled, and the safety pin being in the fourth position when the stapler is pressed against an object for being stapled; an opening on the lock plate for accommodating a protruding member on the safety pin, wherein when the safety pin is in the third position, the second opening on the lock plate and the protruding member on the safety pin are not aligned with each other, and the protruding member on the safety pin stops the lock plate from being moved to the second position, wherein when the safety pin is in the fourth position, the protruding member on the safety pin is inserted into the second opening on the lock plate to allow the lock plate to be moved to the fourth position; and a first spring for urging the safety pin to the fourth position, wherein when in the third position, the safety pin stops the lock plate from being moved to the second position, and when in the fourth position, the safety pin makes room for the lock plate to be moved to the second position.