Connecting device for wiper blade and wiper blade having the same

1. 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.

2. The connecting device according to claim 1 , wherein

the lock member includes at least one limiting portion, which is adapted to be engaged with the base member when the lock member is placed in the locking position to limit further rotation of the lock member in the locking direction upon exertion of the resilient force of the engaging portion against the arcuate outer peripheral surface of the hook.

3. The connecting device according to claim 1 , wherein:

the base member includes first and second side walls, which are opposed to each other in a direction perpendicular to a longitudinal direction of the base member and extend in the longitudinal direction of the base member from the installation portion;

the first and second side walls of the base member form an insertion space, through which the hook is inserted to the installation portion at a time of installing the hook to the installation portion; and

the lock member includes an upper wall, which is located above the base end part of the engaging portion and closes an opening of the insertion space in the locking position of the lock member.

4. The connecting device according to claim 3 , wherein

the upper wall of the lock member includes first and second limiting portions, which are adapted to be engaged with the first and second side walls, respectively, of the base member when the lock member is placed in the locking position to limit further rotation of the lock member in the locking direction upon exertion of the resilient force of the engaging portion against the arcuate outer peripheral surface of the hook.

5. The connecting device according to claim 3 , wherein the engaging portion of the lock member includes:

a first section, which extends from the base end part of the engaging portion into the insertion space in the locking position of the lock member; and

a second section, which extends continuously from the first section and is turned toward the installation portion in the locking position of the lock member; and

the flexing point is located in a turning connection between the first section and the second section.

6. The connecting device according to claim 5 , wherein

the second section of the engaging portion of the lock member includes an arcuate recess, which is configured to coincide with the arcuate outer peripheral surface of the hook.

7. The connecting device according to claim 1 , wherein

the lock member includes a cover, which extends toward the wiper arm to cover a portion of an upper surface of the wiper arm in the locking position of the lock member.

8. A wiper blade comprising:

a wiper strip that is elongated and is adapted to wipe a wiping surface;

a holder member that directly or indirectly holds the wiper strip; and

the connecting device of claim 1 , which is installed to the holder member.

9. The wiper blade according to claim 8 , wherein:

the wiper strip is located on a lower side of the holder member in a top-to-bottom direction of the holder member;

the holder member includes an opening that is placed in a center portion of the holder member in a longitudinal direction of the holder member and extends through the holder member in the top-to-bottom direction; and

the base member of the connecting device is installed in the opening of the holder member.

10. 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 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.

11. The connecting device according to claim 10 , wherein

the lock member includes at least one limiting portion, which is adapted to be engaged with the base member when the lock member is placed in the locking position to limit further rotation of the lock member in the locking direction upon exertion of the resilient force of the engaging portion against the arcuate outer peripheral surface of the hook.

12. The connecting device according to claim 10 , wherein:

the base member includes first and second side walls, which are opposed to each other in a direction perpendicular to a longitudinal direction of the base member and extend in the longitudinal direction of the base member from the installation portion;

the first and second side walls of the base member form an insertion space, through which the hook is inserted to the installation portion at a time of installing the hook to the installation portion; and

the lock member includes an upper wall, which is located above the base end part of the engaging portion and closes an opening of the insertion space in the locking position of the lock member.

13. The connecting device according to claim 12 , wherein

the upper wall of the lock member includes first and second limiting portions, which are adapted to be engaged with the first and second side walls, respectively, of the base member when the lock member is placed in the locking position to limit further rotation of the lock member in the locking direction upon exertion of the resilient force of the engaging portion against the arcuate outer peripheral surface of the hook.

14. The connecting device according to claim 12 , wherein the engaging portion of the lock member includes:

a first section, which extends from the base end part of the engaging portion into the insertion space in the locking position of the lock member; and

a second section, which extends continuously from the first section and is turned toward the installation portion in the locking position of the lock member; and

the flexing point is located in a turning connection between the first section and the second section.

15. The connecting device according to claim 14 , wherein the second section of the engaging portion of the lock member includes an arcuate recess, which is configured to coincide with the arcuate outer peripheral surface of the hook.

16. The connecting device according to claim 10 , wherein

the lock member includes a cover, which extends toward the wiper arm to cover a portion of an upper surface of the wiper arm in the locking position of the lock member.

17. A wiper blade comprising:

a wiper strip that is elongated and is adapted to wipe a wiping surface;

a holder member that directly or indirectly holds the wiper strip; and

the connecting device of claim 10 , which is installed to the holder member.

18. The wiper blade according to claim 17 , wherein:

the wiper strip is located on a lower side of the holder member in a top-to-bottom direction of the holder member;

the holder member includes an opening that is placed in a center portion of the holder member in a longitudinal direction of the holder member and extends through the holder member in the top-to-bottom direction; and

the base member of the connecting device is installed in the opening of the holder member.