JP2006117116A - Wiper blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper blade for further improving wiping property by always bringing a blade rubber into contact with a wiping surface with equal pressure distribution in the longitudinal direction. <P>SOLUTION: The longitudinal length of a vertebra 25 of the wiper blade provided with a blade lever 12 for supporting both ends of the blade rubber 21 mounted with the vertebra 25 and pushed on the wiping surface W via a pair of connecting parts 13 and 30 is formed into substantially the same length as the whole longitudinal length of the rubber 21. Both the end parts of the rubber 21 are reinforced by a member 50 for reinforcing end parts for holding both the ends of the vertebra 25. The longitudinal length of the blade lever 12 is made substantially the same length as the whole longitudinal length of the blade rubber 21. When the whole length of the blade lever 12 is L, a distance between the pair of connecting parts 13 and 30 is X, X≥L/2 is set. Each arcuate-surface lower surface 13a of the pair of connecting parts 13 and 30 of the blade lever 12 is freely pushed on an abutting part 32 of the member 30 for connection for connecting the blade rubber 21 to the pair of connecting parts 13 and 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wiper blade that reliably wipes a wiping surface by swinging on a wiping surface such as a windshield glass of an automobile.

  An example of this type of wiper blade is shown in FIG. 19 (see, for example, Patent Document 1).

  As shown in FIG. 19, the wiper blade 1 has a blade rubber 3 that is held by a backing member 2 that is curved in the longitudinal direction and elastically deformed and pressed against a wiping surface such as a windshield glass (not shown). . A pair of connecting portions 2 a and 2 b are projected from a position separated from both ends of the backing member 2 by a predetermined distance. The pair of connecting portions 2 a and 2 b are supported by the connecting portions 4 a and 4 b at both ends of the lever yoke 4 via pins 5, respectively. Further, the tip end portion 6 a of the wiper arm 6 is supported via a pin 7 at the center of the lever yoke 4. As the wiper arm 6 swings, the wiper blade 1 wipes the curved wiping surface.

No. 5-6216

  However, in the conventional wiper blade 1, the distance between the pair of connecting portions 2 a and 2 b of the backing member 2 supported by the connecting portions 4 a and 4 b at both ends of the lever yoke 4 is the backing member 2 that holds the blade rubber 3. When the lift force is applied during high-speed driving, the pressure at the center of the blade rubber 3 is reduced due to wind drift (lifting by lift), and the center portion of the wiping surface is wiped off. Sex was impaired. Further, since the backing member 2 holding the blade rubber 3 is greatly bent and its rigidity is difficult to ensure, the blade rubber 3 can contact the wiping surface with a uniform pressing force (equal distribution load) in the longitudinal direction. However, since the backing member 2 holding the blade rubber 3 is largely bent and its rigidity is difficult to secure, judder (for example, small swaying and shaking) is likely to occur in the wiping, and the blade rubber 3 The longer the length, the more severe the judder. Furthermore, especially when, for example, snow is accumulated near the lower reversal position of the wiper blade 1 on the wiping surface, the backing member 2 is permanently deformed in the wiping direction with the connecting portion 2a as a fulcrum, and the wiping performance is greatly reduced. was there.

  Therefore, the present invention has been made to solve the above-described problem, and the blade rubber can always be brought into contact with the wiping surface with a uniform pressure distribution in the longitudinal direction, and the wiping property can be further improved. Another object of the present invention is to provide a wiper blade that is capable of generating judder and that does not cause permanent deformation of the vertebra.

  According to the first aspect of the present invention, a blade rubber that is elastically deformed by extending in the longitudinal direction is mounted, and a blade rubber that is pressed against the wiping surface, and a position that is spaced a predetermined distance from both ends of the blade rubber via a pair of connecting portions. In a wiper blade having a blade lever to support, the longitudinal length of the vertebra is formed to be substantially the same as the overall length in the longitudinal direction of the blade rubber, and an end reinforcing member that holds both ends of the vertebra While reinforcing both ends of the blade rubber, the length of the blade lever in the longitudinal direction is formed to be substantially the same as the overall length of the blade rubber in the longitudinal direction. The length of the blade lever is L, and the pair of connecting portions When the distance between them is set to X, X ≧ L / 2 is set, while the blade lever is integrally formed of synthetic resin. The pair of connecting portions are integrally projected on the bottom surface of the blade lever, and the lower surfaces of the pair of connecting portions are formed in an arcuate shape that curves downwardly. The lower surface is configured to be freely pressed against a contact portion of a connecting member that connects the blade rubber to the pair of connecting portions.

  The invention according to claim 2 is the wiper blade according to claim 1, wherein the ratio of the distance X between the pair of connecting portions to the total length L of the blade rubber is set to 0.5 to 0.6. Features.

  A third aspect of the invention is the wiper blade according to the first aspect, wherein the vertebra is curved in a substantially M-shaped side surface so that a convex shape is formed downward between the pair of connecting portions of the vertebra. Features.

  As described above, according to the first aspect of the present invention, when the total length of the blade lever is L and the distance between the pair of connecting portions is X, X ≧ L / 2 is set. The rubber can be brought into contact with the wiping surface with a uniform pressing force in the longitudinal direction, the wiping property can be improved, and the judder of the blade rubber is hardly generated. Further, both ends of the vertebra, which is approximately the same as the entire length of the blade rubber, are held by end reinforcing members, and the length of the blade lever in the longitudinal direction is set to be approximately the same as the entire length of the blade rubber in the longitudinal direction. Since the vertebra is bent in the wiping direction over the entire length of the vertebra, the vertebra is permanently deformed in the wiping direction even when, for example, snow accumulates near the lower reversal position of the wiper blade on the wiping surface. There is no end. Further, the blade lever is integrally formed of a synthetic resin, and a pair of connecting portions are integrally formed on the bottom surface of the blade lever, and the lower surface of the pair of connecting portions is formed in an arcuate surface curved downwardly. When the blade lever is wiped to the wiping surface, the arc-shaped lower surfaces of the pair of connecting portions can be pressed against the contact portion of the connecting member that connects the blade rubber to the pair of connecting portions. In addition, it is possible to avoid that the followability to the wiping surface of the blade rubber is impaired, and it is possible to always obtain a uniform pressing pressure of the blade rubber.

  According to the invention of claim 2, since the ratio of the distance X between the pair of connecting portions with respect to the total length L of the blade rubber is set to 0.5 to 0.6, the blade rubber has a uniform pressing force in the longitudinal direction. It can always be made to contact a wiping surface, and the wiping property can be further improved.

  According to the invention of claim 3, even when the blade lever is wiped and moved on the wiping surface by a simple structure in which the vertebra is curved in a substantially M-shape on the side surface, a uniform pressing pressure can always be obtained. The wiping property can be further improved.

  Embodiment 1 of the present invention will be described below with reference to the drawings.

  1 is a side view showing a wiper blade according to a first embodiment of the present invention, FIG. 2 is a perspective view of a blade lever used in the wiper blade, FIG. 3 is a perspective view of the blade lever as seen from the bottom side, and FIG. FIG. 5 is a bottom view of the blade lever, FIG. 6 is an overall side view showing a state in which the blade rubber is separated from the blade lever, and FIG. 7 is a sectional view taken along the line AA in FIG. 8 is a cross-sectional view taken along line EE in FIG. 7, FIG. 9 is a cross-sectional view of the main part showing a state where the blade rubber is separated from the connecting portion of the blade lever, and FIG. 10A is the blade rubber. FIG. 10 (b) is a plan view of the connection fitting, FIG. 10 (c) is a cross-sectional view of the connection fitting, and FIG. Is a sectional view taken along line BB in FIG. 6, and FIG. FIG. 12B is a plan view of the reinforcing metal fitting used when reinforcing the middle portion of the blade rubber, FIG. 12C is a front view of the reinforcing metal fitting, and FIG. The front view of the edge part of the blade rubber, FIG. 14 (a) is a side view of the end reinforcing metal fitting used when reinforcing both ends of the blade rubber, and FIG. 14 (b) is the end reinforcing metal fitting. FIG. 14 (c) is a front view of the same end portion reinforcing metal fitting, FIG. 15 is a side view showing a state where the wiper blade is pressed against the wiping surface by the wiper arm, and FIG. 16 is a CC line in FIG. FIG. 17 is a view taken in the direction of the arrow D in FIG. 15, and FIG. 18 is an explanatory view showing the relationship between equally distributed load and deflection when the beam is supported at two points in the middle.

  As shown in FIGS. 1, 6 and 15, the wiper blade 10 is positioned at a predetermined distance from both ends of the synthetic resin blade lever 12 mounted on the wiper arm 11 and the bottom surface 12c of the blade lever 12. And a blade unit 20 supported so as to be suspended by a pair of connecting portions 13 formed integrally projecting via a connecting metal fitting (connecting member) 30.

  The blade unit 20 includes a rubber blade rubber 21 pressed against a wiping surface W such as a windshield glass of an automobile, and a pair of vertebras (backing) disposed in the vertebra mounting portions 24a and 24a on both sides of the blade rubber 21. ) 25, 25, a pair of connecting brackets 30, 30 that connect the blade rubber 21 to the blade lever 12 while holding a position at a predetermined distance from both ends of the pair of vertebra 25, 25, and a pair of vertebra A pair of reinforcing metal fittings 40 and 40 as reinforcing members for reinforcing the middle part of the blade rubber 21 by holding the middle part of the blade rubber 21, and a blade by holding both ends of the pair of vertebras 25 and 25. From a pair of end portion reinforcing metal fittings 50 and 50 as end portion reinforcing members that reinforce both end portions of the rubber 21 It has been made.

  As shown in FIGS. 1 to 9, the blade lever 12 is integrally formed in a substantially triangular bar shape made of synthetic resin, and a block-shaped arm attachment portion 12a is integrally formed at the center thereof. The tip of the wiper arm 11 is attached to the arm mounting portion 12a. Further, a pair of connecting portions 13 and 13 each having a substantially quadrangular prism shape are integrally formed at positions spaced apart from both ends of the bottom surface 12c of the blade lever 12 by a predetermined distance. A connecting hole 14 having a rectangular cross section is formed through the lower surface 13a of each connecting portion 13 from the inclined upper surface 12b of the blade lever 12. A locking projection (locking portion) 15 having a triangular cross section is integrally formed on the wall portion 13b of the connecting portion 13 near the center of each connection hole 14. The wall portion 13b is elastically deformed by a relief hole 16 provided in the wall portion 13b. Further, as shown in FIG. 8, the lower surface 13a of each connecting portion 13 is formed in a circular arc shape that curves downward in the longitudinal direction, and the arc-shaped lower surface 13a of each connecting portion 13 is formed. Is pressed against a pair of horizontal portions (contact portions) 32, 32 of each connection fitting 30 described later.

  As shown in FIGS. 3, 5 and 9, on both sides of the bottom surface 12c of the blade lever 12, extending portions 12d and 12d extending downward from both end sides of the bottom surface 12c are integrally formed. . The blade unit 20 is accommodated between the pair of extending portions 12d, 12d. Further, as shown in FIGS. 3 and 5, a plurality of reinforcing ribs 12e are integrally formed in a zigzag shape inclined in a staggered manner between the pair of extending portions 12d, 12d of the bottom surface 12c of the blade lever 12. is there.

  As shown in FIGS. 1, 6 to 9, 11, 13, and 15 to 17, the rubber blade rubber 21 includes a lip portion 22, a neck portion 23, and a head portion 24, and a blade lever. 12 is formed to have substantially the same length as the entire length in the longitudinal direction. The lip portion 22 of the blade rubber 21 has a width dimension substantially the same as the width dimension of the head 24 and has a cross-sectional shape of an inverted triangle. A wiping surface sliding contact portion 22 a that contacts the wiping surface W when the lip portion 22 is pressed against a wiping surface W such as a windshield glass of an automobile is formed at the lower end of the lip portion 22.

  Further, the neck portion 23 of the blade rubber 21 is formed along the length direction of the lip portion 22 with a considerably smaller width size than the width size formed by the pair of flange portions 22b, 22b of the lip portion 22. For this reason, when the wiper blade 10 is pressed against the wiping surface W by the wiper arm 11, the lip portion 22 tilts with respect to the head 24.

  Further, as shown in FIGS. 7, 9, 11, 12, and 16, the head portion 24 of the blade rubber 21 is formed in a rectangular bar shape and integrally formed at the upper end of the neck portion 23. A pair of vertebra mounting parts 24a, 24a are formed in a lateral groove shape along the longitudinal direction from the substantially central position on both sides of the head 24 toward the center. A vertebra 25 is inserted into each of the pair of vertebra mounting portions 24a and 24a.

  As shown in FIGS. 1 and 6, each vertical bra 25 attached to the blade rubber 21 is formed in a plate shape by a metal spring material having elasticity, and is formed over the entire length of the blade rubber 21 in the longitudinal direction. In addition, the side surface is curved in a substantially M shape. The blade rubber 21 is curved downwardly between the pair of connecting metal fittings 30 and 30 by the vertebra 25 that is curved in a substantially M-shaped side surface, and the peripheral portion of each connecting metal fitting 30 is convex upward. Thus, the entire surface is formed in a substantially M-shape.

  Further, as shown in FIG. 6, when the total length of the blade rubber 21 is L and the distance between the pair of connecting metal fittings 30 and 30 is X, X ≧ L / 2 is set. is there. Specifically, the ratio of the distance X between the pair of metal fittings 30 and 30 to the total length L of the blade rubber 21 is set to 0.5 (50%) to 0.6 (60%). This ratio is derived as follows.

  FIG. 18 is an explanatory diagram showing the relationship between the evenly distributed load and the deflection when the beam is supported at two points in the middle part.

In FIG. 18, when the total length of the beam is L, the distance between the two points of support is L2, and the distance from the end to the support point is L1, the deflection νx = L / 2 at the center position is expressed by the following equation (1). expressed.
νx = L / 2 = WL2 ² (5L2 ² −24L1 ² ) / 384EI (1)

  Here, W is a load per unit length, E is a Young's modulus (longitudinal elastic modulus), and I is a cross-sectional secondary moment.

In order to project downward in the distance L2, the formula (1) needs to be ≧ 0. Since WL2 ² / 384EI is a positive value, it is sufficient if 5L2 ² -24L1 ² ≧ 0.

  Since L1 = (L−L2) / 2 and L> L2> 0, L2 ≧ 0.525L. In this embodiment, L2 = X, and therefore X ≧ 0.525L.

  In the first embodiment, for example, when the total length L of the blade rubber 21 is 650 mm, the distance X between the pair of connecting metal fittings 30 and 30 is 350 mm (about 54% of the whole). The distance from the metal fitting 30 to each end portion reinforcing metal piece 50 is set to be 150 mm.

  As shown in FIGS. 7 to 10, the connecting metal fitting 30 includes a vertical bent portion 31 and a pair of horizontal portions (contact portions) 32 extending horizontally outward from the lower end of the vertical bent portion 31. 32 and a pair of gripping portions 33 and 33 which are bent inward in a substantially U shape at the tip of each horizontal portion 32 and squeeze from the outside to the center of the vertebra 25 are formed into a substantially inverted T-shape in front. It is. A rectangular engagement hole (engagement portion) 31 a is formed in the center of the vertical folding portion 31 of the connection fitting 30.

  Then, as shown in FIG. 9, when the pair of vertebras 25 mounted in the pair of vertebra mounting parts 24 a, 24 a of the head 24 of the blade rubber 21 is clamped by the pair of clamping parts 33, 33 of the coupling metal 30. The head portion 24 of the blade rubber 21 is securely fixed and held between the step portions 34 and 34 at the boundary between the horizontal portion 32 of the connecting metal fitting 30 and the holding portion 33. From this state, when the vertical bent portion 31 of the connecting metal fitting 30 is inserted into the connecting hole 14 of the connecting portion 13 of the blade lever 12 from below, the vertical bent portion 31 is connected to the connecting portion 13 of the blade lever 12. It comes into contact with a locking projection 15 formed integrally with the wall 13b. Since the wall portion 13b of the connecting portion 13 is made elastic by the escape hole 16 provided side by side, the wall portion 13b is elastically deformed and the insertion of the vertical folding portion 31 is continued, and the vertical bending portion 31 is continued. When the locking projection 15 is engaged with the engagement hole 31a, the wall portion 13b returns to its original position. Thereafter, as shown in FIGS. 7 and 8, the pair of horizontal portions 32, 32 of the connection fitting 30 are pressed against the arcuate lower surfaces 13 a of the pair of connection portions 13, 13 of the blade lever 12. Therefore, further insertion is prevented, and the blade unit 20 is supported by the blade lever 12 via the pair of connection fittings 30 and 30 and the pair of connection portions 13 and 13. The downward support in FIG. 7 is provided by the locking projection 15 that engages with the engagement hole 31a, and the upward support in FIG. 7 is each connection portion of the blade lever 12 that contacts the pair of horizontal portions 32, 32. 13 arcuate surface-like lower surfaces 13a. The support in the left-right direction in FIG. 7 is made by the vertical bent portion 31 and the connecting hole 14 of the blade lever 12 into which the vertical bent portion 31 is inserted.

  As shown in FIGS. 11, 12, and 16, the reinforcing metal fitting 40 has a horizontal portion 41 and is bent inward in a substantially U shape at the tip of the horizontal portion 41 so as to extend from the outside to the center of the vertebra 25. The pair of holding portions 42 and 42 to be bent is formed to be bent in a substantially C shape on the front. Then, as shown in FIG. 11, the pair of vertebras 25, 25 mounted in the pair of vertebra mounting parts 24 a, 24 a of the head 24 of the blade rubber 21 is replaced by a pair of holding parts 42, 42 of the reinforcing bracket 40. When gripped, the head portion 24 of the blade rubber 21 is securely fixed and held between the step portions 43 and 43 at the boundary between the horizontal portion 41 of the reinforcing metal fitting 40 and the gripping portion 42.

  As shown in FIGS. 13, 14, and 17, the end portion reinforcing metal fitting 50 includes a horizontal portion 51 and a substantially U-shape that is bent inwardly at the tip of the horizontal portion 51, from the outside to the center of the vertebra 25. A pair of holding portions 52, 52 that rub the ridge and a pressing portion 53 that extends horizontally from one side portion of the horizontal portion 51 and is bent downward in an L-shape are bent into a substantially C-shape in front. . Then, as shown in FIG. 13, the pair of vertebras 25, 25 mounted in the pair of vertebra mounting parts 24 a, 24 a of the head 24 of the blade rubber 21 is replaced with a pair of gripping parts 52 of the end reinforcing metal fittings 50, When gripped by 52, the head portion 24 of the blade rubber 21 is securely fixed and held between the step portions 54, 54 at the boundary between the horizontal portion 51 of the end reinforcing metal fitting 50 and the gripping portion 52. Yes. At this time, the end portions of the blade rubber 21 and the end portions of the vertebra 25 are securely held without being displaced by the L-shaped pressing portions 53 of the end reinforcing metal fittings 50. It has become.

  According to the wiper blade 10 of the first embodiment as described above, as shown in FIG. 6, the blade lever 12 and the blade unit 20 are separated from each other, and the pair of connecting members fixed to the blade rubber 21 and the pair of vertebras 25 and 25 are used. The vertical folding portions 31 of the metal fittings 30 are simply inserted into the connection holes 14 of the pair of connection parts 13 and 13 of the blade lever 12 from below, so that the vertical parts of the pair of metal fittings 30 and 30 are connected to each other. The engagement hole 31 a of the bent overlap portion 31 is engaged with the engagement protrusion 15 in each connection hole 14 of the pair of connection portions 13, 13 of the blade lever 12. As a result, the blade unit 20 is simply supported in the connection holes 14 of the pair of connection portions 13, 13 of the blade lever 12 so as to be suspended via the pair of connection fittings 30, 30.

  The wiper blade 10 is wiped on the wiping surface W by the swing of the wiper arm 11 to which the wiper blade 10 is attached. At this time, the arcuate surface-like lower surfaces 13 a of the pair of connecting portions 13, 13 integrally formed on the bottom surface 12 c of the synthetic resin blade lever 12 connect the blade rubber 21 to the pair of connecting portions 13, 13. Since the vertical bent portion 31 is pressed against the pair of horizontal portions 32, 32 of each connection fitting 30, the followability of the blade rubber 21 to the wiping surface W can be prevented from being impaired. Thus, it is possible to always obtain a uniform pressing pressure of the blade rubber 21.

  Further, when the ratio of the distance X between the pair of connecting metal fittings 30 and 30 to the total length L of the blade rubber 21 of the wiper blade 10 is, for example, the total length L of the blade rubber 21 is 650 mm, the pair of connecting metal fittings 30 , 30 is set to be about 54% (X ≧ L / 2) when the distance X is 350 mm so that the distance between the pair of connecting metal fittings 30, 30 of the blade rubber 21 is always convex downward. Therefore, the blade rubber 21 can always be brought into contact with the wiping surface W with a substantially uniform pressing force in the longitudinal direction. Thereby, even if the pressing force at the central portion of the blade rubber 21 is reduced due to win drift (lifting by lifting force) during high-speed traveling, it is possible to avoid wiping performance deterioration at the central portion of the wiping surface W.

  In addition, when the blade unit 20 including the blade rubber 21 and the pair of vertebras 25 and 25 is set on the blade lever 12, the blade unit 20 is small in bending and easy to secure its rigidity. It is possible to reliably prevent intense shaders (for example, wiggles and tremors) that tend to occur. As a result, the blade rubber 21 can be brought into contact with the wiping surface W with a uniform pressing force (equally distributed load) in the longitudinal direction, and the wiping property can be further improved. Furthermore, even if a long blade rubber 21 having a total length L of 650 mm is used, the main body strength can be shared by the constituent members constituting the blade unit 20, so that the rigidity is increased and the long wiper blade 10 can be used. It can respond sufficiently.

  Further, both ends of a pair of vertebras 25, 25 having substantially the same length as the entire length of the blade rubber 21 are sandwiched by end reinforcing metal fittings 50, 50, and the length of the blade lever 12 in the longitudinal direction is determined by the blade Since the rubber 21 is formed to have substantially the same length as the entire length in the longitudinal direction, the movement in the wiping direction at both ends of the vertebra 25 is such that the outer surface of the sandwiching portion 52 of each reinforcing bracket 50 contacts the lower extension portion 12d of the blade lever 12. It is regulated by touching. For this reason, the deflection in the wiping direction of the vertebra 25 is restricted over the entire length of each vertebra 25, and the vertebra 25 is also in the wiping direction even when, for example, snow is accumulated near the lower reversal position of the wiper blade 10 on the wiping surface W. Can be prevented from being permanently deformed.

  Further, the pair of connecting brackets 30 and 30 of the blade rubber 21 can always be formed in a downwardly convex shape with a simple structure in which the pair of vertebras 25 and 25 are each curved in a substantially M-shaped manner. it can. Thereby, when wiping the blade rubber 21 on the wiping surface W, a uniform pressing force can always be obtained and the wiping performance can be further improved. Further, the free packaging of the wiper blade 10 becomes compact.

  According to the first embodiment, the pair L of the coupling members 30 and 30 with respect to the total length L of the blade rubber 21 is set such that the total length L of the blade rubber 21 is 650 mm and the distance X between the pair of coupling brackets 30 and 30 is 350 mm. Although a specific example in which the ratio of the distance X between them is set to about 54% has been described, it is needless to say that the present invention is not limited to these numerical values.

It is a side view which shows the wiper blade of Example 1 of this invention. It is a perspective view of the blade lever used for the said wiper blade. It is the perspective view which looked at the said blade lever from the bottom face side. It is a top view of the said blade lever. It is a bottom view of the said blade lever. It is a whole side view which shows the state which isolate | separated the blade rubber from the said blade lever. It is sectional drawing which follows the AA line in FIG. It is sectional drawing which follows the EE line in FIG. It is sectional drawing of the principal part which shows the state which isolate | separated the blade rubber from the connection part of the said blade lever. (A) is a side view of a connecting bracket used when the blade rubber is connected to the connecting portion of the blade lever, (b) is a plan view of the connecting bracket, and (c) is a sectional view of the connecting bracket. It is. It is sectional drawing which follows the BB line in FIG. (A) is a side view of the reinforcing metal fitting used when reinforcing the middle part of the blade rubber, (b) is a plan view of the reinforcing metal fitting, and (c) is a front view of the reinforcing metal fitting. It is a front view of the edge part of the said blade rubber. (A) is a side view of the end-reinforcing metal fitting used when reinforcing both ends of the blade rubber, (b) is a plan view of the same-end reinforcing metal fitting, and (c) is the end-reinforcing metal fitting. It is a front view. It is a side view which shows the state by which the said wiper blade was pressed on the wiping surface by the wiper arm. It is sectional drawing which follows the CC line in FIG. It is a D arrow line view in FIG. It is explanatory drawing which shows the relationship between equal distribution load and bending when a beam is supported by two points of the middle part. It is a side view of the conventional wiper blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Wiper blade 12 Blade lever 12c Bottom surface 13 Connection part 13a Arc-shaped lower surface 21 Blade rubber 25 Vertibra 30 Connection metal fitting (connection member)
32 Horizontal part (contact part)
50 End reinforcement brackets (end reinforcement members)
W Wiping surface L Total length of blade rubber X Distance between a pair of connecting parts

Claims (3)

It is equipped with a blade rubber that is attached to a vertebra that extends in the longitudinal direction and elastically deforms and is pressed against the wiping surface, and a blade lever that supports a position at a predetermined distance from both ends of the blade rubber via a pair of connecting portions. In the wiper blade
The length in the longitudinal direction of the vertebra is formed to be substantially the same as the entire length in the longitudinal direction of the blade rubber, and both end portions of the blade rubber are reinforced by end reinforcing members that sandwich both ends of the vertebra. When the length in the longitudinal direction of the blade lever is formed to be substantially the same as the overall length in the longitudinal direction of the blade rubber, the overall length of the blade lever is L, and the distance between the pair of connecting portions is X, X ≧ While setting to be L / 2,
The blade lever is integrally formed of synthetic resin, and the pair of connecting portions is integrally formed on the bottom surface of the blade lever, and the lower surface of the pair of connecting portions is formed in an arcuate surface curved downwardly. A wiper blade characterized in that each arcuate lower surface of the pair of connecting portions can be pressed against a contact portion of a connecting member for connecting the blade rubber to the pair of connecting portions. The wiper blade according to claim 1,
The wiper blade according to claim 1, wherein a ratio of a distance X between the pair of connecting portions with respect to a total length L of the blade rubber is set to 0.5 to 0.6. The wiper blade according to claim 1,
A wiper blade characterized in that the vertebra is curved in a substantially M-shaped side surface so that a convex shape is formed downward between the pair of connecting portions of the vertebra.

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