Connecting device for wiper blade and wiper blade having the same

A connecting device for a wiper blade that is configured to be connected to a wiper arm through the connecting device, the connecting device comprising:

• a base member that includes an installation portion, to which a hook of the wiper arm configured into a U-shape form is adapted to be installed after installation of the base member to the wiper blade;
• and
• a lock member that is rotatably connected to the base member and is adapted to be engaged with an arcuate outer peripheral surface of the hook after installation of the hook to the installation portion, wherein:
• the lock member is rotatable between:
• a locking position, in which the lock member is engaged with the arcuate outer peripheral surface of the hook upon rotation of the lock member in a locking direction to lock the hook against the installation portion and thereby to disable relative movement between the installation portion and the hook;
• and
• an unlocking position, in which the lock member is disengaged from the arcuate outer peripheral surface of the hook upon rotation of the lock member in an unlocking direction, which is opposite from the locking direction, to enable detachment of the hook from the installation portion;
• the lock member includes an engaging portion, which is adapted to be engaged with the arcuate outer peripheral surface of the hook to exert a resilient force against the arcuate outer peripheral surface of the hook after the installation of the hook to the installation portion;
• the resilient force of the engaging portion is exerted as a rotational force in the locking direction of the lock member against the arcuate outer peripheral surface of the hook when the lock member is placed in the locking position;
• the engaging portion of the lock member has a flexing point, about which the engaging portion is flexed by the arcuate outer peripheral surface of the hook relative to a base end part of the engaging portion when the lock member is rotated in the locking direction from the unlocking position to the locking position;
• a center of an arc of the arcuate outer peripheral surface of the hook and a rotational axis of the lock member are located along an imaginary straight line after the installation of the hook to the installation portion;
• and
• the flexing point of the engaging portion of the lock member is placed at a corresponding position, which is spaced from the imaginary straight line in the locking direction of the lock member, when the lock member is placed in the locking position.