A wiper blade assembly which includes a blade, at least one backing which is fitted into an attachment groove of the blade, and an elongated holder member which is interconnected to the blade.
1. A wiper blade comprising:
a rubber blade that wipes a wiping surface, wherein the rubber blade includes a base and at least one attachment groove, which extends in a longitudinal direction;
at least one backing having a predetermined rigidity and including a central part outwardly curved opposite to the wiping surface, wherein the backing is formed from a spring material and fitted into the attachment groove of the rubber blade; and
an elongated holder member including a longitudinally central part coupled to a distal portion of a wiper arm, a first end and second end, which are arranged at two longitudinal sides, and a first holding portion and second holding portion, which are respectively arranged at the sides of the first end and the second end, wherein the first holding portion and the second holding portion hold the base of the rubber blade, wherein
the rubber blade projects in the longitudinal direction from the first and second holding portions of the holder member thereby forming a following end portion that follows a curve of the wiping surface,
the holder member has a substantially U-shaped cross-section and includes an upper wall portion facing an upper surface of the base of the rubber blade and side wall portions facing each other and extending towards the wiping surface from two widthwise sides of the upper wall portion,
the first holding portion and the second holding portion each include a holding piece extending from the side wall portions in a widthwise direction toward the inside of the rubber blade, a bridge portion arranged at an inside of at least one of the first holding portion and the second holding portion and connecting between the side wall portions, and two contact wall portions extending outward in the longitudinal direction from at least one of the first holding portion and the second holding portion and respectively contacting two side surfaces of the following end portion,
the two contact wall portions are at least one of first contact wall portions and second contact wall portions, wherein the first contact wall portions are arranged between the holding piece of the first holding portion and the first end, wherein the second contact wall portions are arranged between the holding piece of the second holding portion and the second end, and
at least one of the first contact wall portions and the second contact wall portions have a length in the longitudinal direction that is longer than a length of the holding piece of the corresponding first holding portion and the second holding portion in a longitudinal direction.
2. The wiper blade according to claim 1 , wherein the first holding portion and the second holding portion each include clamping wall portions further extending from the side wall portions toward the wiping surface and clamping the base of the rubber blade from two widthwise sides, and the holding piece extending from a distal portion of each clamping wall portion into a holding groove formed at a position closer to the wiping surface than the attachment groove of the rubber blade.
3. The wiper blade according to claim 2 , wherein the bridge portion contacts with the upper surface of the base of the rubber blade.
4. The wiper blade according to claim 2 , wherein the upper wall portion and the side wall portions of at least one of the first holding portion and the second holding portion extend outward in the longitudinal direction, and the upper wall portion and the side wall portions couple the two contact wall portions to each other at the extended portion.
5. The wiper blade according to claim 1 , wherein the contact wall portions include two pairs of contact wall portions extending outward in the longitudinal direction from both of the first holding portion and the second holding portion and respectively contacting the two side surfaces of the following end portion.
6. The wiper blade according to claim 1 , wherein:
the attachment groove is one of a plurality of attachment grooves extending in a longitudinal direction in widthwise sides of the base;
the rubber blade includes an end portion;
the backing includes a hooking portion;
the base of the rubber blade includes two longitudinal end portions;
the wiper blade further comprising two caps, wherein each of the two caps is attached to each of the two longitudinal end portions of the base of the rubber blade to prevent separation of the backing from the plurality of attachment grooves, wherein the cap includes a hooking portion arranged in the cap;
the end portion of the rubber blade includes a first hooking portion, which is hooked to the hooking portion of the cap, and a second hooking portion, which is hooked in a longitudinal direction to the hooking portion of the backing; and
the first hooking portion overlaps the second hooking portion in the longitudinal direction or the first hooking portion is located inward in the longitudinal direction from the second hooking portion.
7. The wiper blade according to claim 6 , wherein the second hooking portion is arranged at two end portions of the rubber blade.
8. The wiper blade according to claim 6 , wherein the backing includes two backings, the hooking portion of one of the backings is positioned a first distance from a longitudinal end portion of the one of the backings and the hooking portion of the other backings is positioned a second distance from a longitudinal end portion of the other backings, wherein the first distance is different than the second distance, and the hooking portion of each backing is hooked to the second hooking portion only when the two backings are attached to the plurality of attachment grooves in a normal attachment state.
9. The wiper blade according to claim 6 , wherein each of the two longitudinal end portions of the base includes a recessed upper surface.
10. The wiper blade according to claim 6 , wherein the first hooking portion is arranged on the upper surface of the base of the rubber blade.
11. The wiper blade according to claim 10 , wherein the first hooking portion is a protrusion formed on the upper surface of the base, and the hooking portion of one of the two caps, which is hooked to the first hooking portion, is a through-hole extending in a vertical direction of the one of the two caps.
12. The wiper blade according to claim 1 , wherein the first holding portion and the second holding portion each include:
side wall portions;
clamping wall portions further extending from a part of the side wall portions toward the wiping surface; and
a bridge portion that couples the clamping wall portions.
13. The wiper blade according to claim 1 , wherein
the first holding portion and the second holding portion each include clamping wall portions further extending toward the wiping surface from the side wall portions of the corresponding first holding portion and the second holding portion,
the clamping wall portions each have a distal end, which defines the holding piece extending in the widthwise direction toward the inside of the rubber blade,
the bridge portion connects between the clamping wall portions, and
the bridge portion contacts with the upper surface of the base of the rubber blade.