JP2009078782A - Wiper arm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper arm capable of securely preventing the elongation of a hook at the base end side of a coil of an arm spring to obtain normal arm pressure all the time during the lock-back of a retainer. <P>SOLUTION: The wiper arm is provided with an arm head 21 having a base end 21a fixed to a pivot shaft 11 and a tip 21b with a support shaft 22 formed thereat; the retainer 25 having a base end 25a rotatably supported by the support shaft 22 and a tip 25b fitted with a wiper blade 30; and the arm spring 29 in which hooks 29c, 29d provided at both sides of the coil 29a are locked on a spring lock part 23 of the arm head 21 and a spring lock part 28 of the retainer 25 and which presses and energizes the tip 25b of the retainer 25 to the wiping face side. During the rotation of the retainer 25 with respect to the arm head 21, the base end 29b of the coil 29a of the arm spring 29 is made to abut on a regulation face 25B formed on the retainer 25. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wiper arm used to swing a wiper blade for wiping a wiping surface such as a windshield glass of an automobile.

  An example of this type of wiper arm is shown in FIG. 4 (see, for example, Patent Document 1).

  As shown in FIG. 4, the wiper arm 1 has a base end portion 2a fixed to a pivot shaft 8 via a nut 9, an arm head 2 having a tip end 2b and a support shaft 3, and a base end portion 4a. A retainer 4 that is rotatably supported by the support shaft 3 and that has a wiper blade (not shown) at the tip thereof, and a spring locking portion 2f of the arm head 2 and a spring locking portion of the retainer 4 Hook portions 7a and 7b provided on both sides of the coil portion 6 are respectively engaged with 4f, and arm springs 5 are provided to press and urge the tip of the retainer 4 toward the wiping surface.

  In the center of the lower surface 4 c of the base end portion 4 a of the retainer 4, a relief groove 4 d into which the hook portion 7 b on the base end side of the coil portion 6 of the arm spring 5 is inserted is formed. Abutting portions 4e as stoppers for restricting the hook portion 7b on the proximal end side of the coil portion 6 of the arm spring 5 from being accommodated in the inside of the escape groove 4d project on both opposing inner surfaces of the escape groove 4d. It is set up. Since the hook portion 7b on the proximal end side of the coil portion 6 of the arm spring 5 cannot be accommodated in the escape groove 4d by the contact portion 4e of the retainer 4, it is caused by a cross wind or the like during cleaning or high speed traveling. Transition of the retainer 4 to an unexpected lock-back state (a state in which the retainer 4 of the wiper arm 1 is locked in a completely upright position) is avoided in advance.

Japanese Patent Laying-Open No. 2004-345583 (FIG. 3)

  However, in the conventional wiper arm 1, if the lockback of the retainer 4 is restricted by the contact portion 4e, the coil portion 6 of the arm spring 5 may be extended. There arises a problem that it becomes impossible to obtain a pressing force (arm pressure) for wiping the wiping surface.

  Therefore, the present invention has been made to solve the above-described problems, and provides a wiper arm that can reliably prevent the coil portion of the arm spring from extending and always obtain a normal arm pressure when the retainer is locked back. The purpose is to do.

  According to the first aspect of the present invention, the base end portion is fixed to the pivot shaft, the arm head having a support shaft formed at the tip end portion, the base end portion is rotatably supported by the support shaft, and the tip end portion is The retainer to which the wiper blade is mounted, and the hook portions provided on both sides of the coil portion are engaged with the spring engaging portion of the arm head and the spring engaging portion of the retainer, respectively, and the tip of the retainer is wiped off. In a wiper arm provided with an arm spring that presses and biases toward the side, when the retainer rotates relative to the arm head, the base end of the coil portion of the arm spring abuts on a regulating surface formed on the retainer. It is characterized by that.

  The invention according to claim 2 is the wiper arm according to claim 1, wherein the restricting surface of the retainer is formed at a proximal end portion of the retainer.

  A third aspect of the invention is the wiper arm according to the first aspect, wherein the restricting surface of the retainer is a side wall of an arm spring storage portion formed on the retainer.

  The invention according to claim 4 is the wiper arm according to claim 3, wherein the coil portion of the arm spring housed in the arm spring housing portion of the retainer is biased toward the regulating surface. And

  As described above, according to the first aspect of the present invention, when the retainer rotates with respect to the arm head, the proximal end of the coil portion of the arm spring is brought into contact with the regulating surface formed on the retainer. The arm spring can be reliably prevented from being stretched at the time of lockback, and a normal arm pressure can always be obtained.

  According to the invention of claim 2, the restraining surface of the retainer is formed at the base end portion of the retainer, so that the coil spring of the arm spring is more reliably prevented from being stretched at the time of the retainer lockback, and is always stable. Arm pressure can be obtained, and the base end of the coil portion of the arm spring can be reliably brought into contact.

  According to the invention of claim 3, the restricting surface of the retainer is the side wall of the arm spring housing portion formed on the retainer, so that the extension of the coil portion of the arm spring can be more reliably prevented when the retainer is locked back. A stable arm pressure can always be obtained, and a conventional retainer can be used as it is.

  According to the invention of claim 4, the coil portion of the arm spring housed in the arm spring housing portion of the retainer is biased toward the regulating surface side, so that the extension of the coil portion of the arm spring at the time of the retainer lockback. Can be more reliably prevented and a stable arm pressure can be obtained at all times, and the angle of rotation of the retainer relative to the arm head can be set small.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a wiper device using a wiper arm according to an embodiment of the present invention in partial cross section, FIG. 2 is a plan view of the wiper arm, and FIG. 3 is a side view of the wiper arm when lockback is prevented.

  As shown in FIG. 1, a wiper device 10 for an automobile includes a wiper arm 20 and a wiper blade 30 that is rotatably connected to a distal end portion of the wiper arm 20. The wiper blade 30 includes a rubber blade rubber 31 that is brought into contact with a wiping surface such as a windshield glass of an automobile, a pair of lever yokes 32 and 32 attached to both ends of the blade rubber 31, and the lever yokes. It is composed of a synthetic resin blade lever 33 that is rotatably supported with its both ends spanned around the center of 32. A central portion of the blade lever 33 is rotatably attached to the distal end portion 25 b of the retainer 25 of the wiper arm 20 via a support shaft 34.

  As shown in FIGS. 1 to 3, the wiper arm 20 includes a synthetic resin arm head 21 in which a base end portion 21 a is fixed to a pivot shaft 11 via a nut 12, and a support shaft 22 is integrally formed at a distal end portion 21 b. And a retainer 25 made of a synthetic resin that forms a locking recess 26 in which the support shaft 22 is rotatably supported at the base end portion 25a, and a wiper blade 30 is attached to the tip end portion 25b, and these arm heads 21 A metal arm spring 29 is provided between the retainer 25 and presses and urges the front end portion 25b of the retainer 25 toward the wiping surface side of a windshield glass of an automobile.

  As shown in FIGS. 1 to 3, the base end portion 21 a of the arm head 21 is formed with a stepped circular coupling hole 21 c into which the upper end 11 a of the pivot shaft 11 is fitted. Further, a recess 21d is cut out at the front center of the tip 21b of the arm head 21. A substantially elliptical column-shaped support shaft 22 is integrally formed in the lateral direction on the front side between the opposing inner surfaces of the recess 21d of the arm head 21, and the rear of the support shaft 22 on the opposing inner surface of the recess 21d. The arm spring locking pin (spring locking portion) 23 is integrally projected.

  As shown in FIGS. 1 and 3, the middle portion 25c of the retainer 25 is formed in a U-shaped cross section between the ceiling wall and both side walls, and an arm spring accommodating portion in which an arm spring 29 is accommodated. Is formed. Further, an arm spring locking pin (spring locking portion) 28 is integrally formed between the opposing inner surfaces of both side walls of the retainer 25 midway portion 25c. Further, hook-shaped tips of hook portions 29c and 29d provided on both sides of the coil portion 29a of the arm spring 29 are provided on the spring-locking pin 23 of the arm head 21 and the spring-locking pin 28 of the retainer 25, respectively. Are locked.

  As shown in FIG. 2, the base end portion 25 a of the retainer 25 is formed in a size that can be accommodated in the concave portion 21 d of the distal end portion 21 b of the arm head 21. As shown in FIGS. 1 and 3, a substantially C-shaped locking recess 26 is formed from the center of the rear surface of the base end portion 25 a of the retainer 25 to the center, and an arm is formed in the locking recess 26. The support shaft 22 of the head 21 is detachably and rotatably connected. Further, a storage recess 27 is formed in the center of the lower surface 25A of the base end portion 25a of the retainer 25 to store the hook portion 29d on the base end 29b side of the coil portion 29a of the arm spring 29. The storage recess 27 is formed in a longitudinal groove shape so as to extend from the front surface 25B of the base end portion 25a of the retainer 25 to the rear surface 25C. Further, the front surface 25B of the base end portion 25a of the retainer 25 serves as a restricting surface as a stopper with which the base end 29b of the coil portion 29a of the arm spring 29 abuts. When the base end 29b of the coil portion 29a of the arm spring 29 comes into contact with the regulating surface (front surface) of the retainer 25, that is, the side wall 25B of the arm spring storage portion, the retainer 25 is stored in the storage recess 27 of the base end portion 25a. The extension of the hook portion 29d on the base end 29b side of the coil portion 29a of the arm spring 29 is prevented. At this time, the coil portion 29a of the arm spring 29 accommodated in the arm spring accommodating portion of the middle portion 25c of the retainer 25 is biased toward the side wall (regulating surface) 25B.

  According to the wiper arm 20 of the above embodiment, as shown in FIG. 3, the retainer 25 is unexpectedly locked back due to a crosswind or the like during cleaning or high-speed traveling (the retainer 25 of the wiper arm 20 is maintained in a complete standing posture). The hook portion 29d on the base end 29b side of the coil portion 29a of the arm spring 29 abuts on the top wall surface 27a of the storage recess 27 of the base end portion 25a of the retainer 25, and the arm spring 29 The base end 29b of the coil portion 29a of the 29 is abutted against the restricting surface 25B of the base end portion 25a of the retainer 25, and the lockback state of the retainer 25 is avoided in advance. Thereby, the extension of the coil portion 29a of the arm spring 29 can be reliably prevented when the retainer 25 shifts to the lockback, and the arm pressure (for wiping the wiping surface such as the windshield glass) of the distal end portion 25b of the retainer 25 can be prevented. The pressing force) can always be ensured in a normal and stable state.

  Then, the restriction surface with which the base end 29b of the coil portion 29a of the arm spring 29 abuts is used as the side wall 25B of the arm spring accommodating portion of the middle portion 25c of the retainer 25, so that the conventional retainer can be used as it is. .

  In addition, by restricting the coil portion 29a of the arm spring 29 housed in the arm spring housing portion toward the restricting surface 25B, the restricting angle of the rotation of the retainer 25 relative to the arm head 21 can be set small.

  In addition, according to the said embodiment, although the synthetic resin arm head and the retainer were used, not only synthetic resin but metal may be used.

It is a side view which shows the wiper apparatus using the wiper arm of one Embodiment of this invention in a partial cross section. It is a top view of the said wiper arm. It is a side view at the time of the lockback prevention of the said wiper arm. It is sectional drawing at the time of lock back prevention of the conventional wiper arm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Pivot shaft 20 Wiper arm 21 Arm head 21a Base end part 21b Tip part 22 Support shaft 23 Pin for arm spring locking (spring locking part)
25 Retainer 25a Base end portion 25b Tip end portion 25A Lower surface 25B Side wall (regulation surface) of arm spring storage portion
25C Rear surface 27 Vertical groove-shaped storage recess 28 Arm spring locking pin (spring locking portion)
29 Arm spring 29a Coil part 29b Base end of coil part 29c, 29d Hook part 30 Wiper blade

Claims (4)

An arm head having a base end fixed to a pivot shaft, a support shaft formed at the tip end, and a base end portion rotatably supported by the support shaft, and a wiper blade mounted at the tip end And hook portions provided on both sides of the coil portion are respectively engaged with the spring engaging portion of the arm head and the spring engaging portion of the retainer, and the tip portion of the retainer is pressed and biased toward the wiping surface side. In a wiper arm with a spring,
A wiper arm characterized in that, when the retainer rotates with respect to the arm head, a base end of a coil portion of the arm spring comes into contact with a regulating surface formed on the retainer. The wiper arm according to claim 1,
The wiper arm according to claim 1, wherein the restricting surface of the retainer is formed at a proximal end portion of the retainer. The wiper arm according to claim 1,
The wiper arm according to claim 1, wherein the restricting surface of the retainer is a side wall of an arm spring storage portion formed on the retainer. The wiper arm according to claim 3,
The wiper arm according to claim 1, wherein the coil portion of the arm spring housed in the arm spring housing portion of the retainer is biased toward the regulating surface.

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