JP2005075240A - Blade attaching structure in wiper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade attaching structure in a wiper device, eliminating a stopper mechanism, requiring inexpensive manufacturing cost, preventing a primary lever of a blade from accidentally coming off from a tip end of a wiper arm, and sharing the blade even if the length from the tip end of the wiper arm to an attaching groove is different. <P>SOLUTION: In the wiper device, coupling shafts 8, 9b provided on the blade for wiping a window surface are detachably and rotatably supported in the attaching groove 3 provided at the tip end 1a of the wiper arm 1. In the attaching groove 3, a groove deep portion 3a and a groove entrance portion 3b having narrower width than the groove back portion 3a are formed. The coupling shafts 8, 9b are journaled so as to move between a coupling position prevented from slipping off from the groove entrance portion 3b and a attaching/detaching position freely entering/coming out from the groove entrance portion 3b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention belongs to the technical field of a blade mounting structure in a wiper device to be mounted on a vehicle such as a passenger car, a bus, a truck, a railroad, an aircraft, and a ship.

  In general, in this type of wiper device, as shown in FIG. 18, a large-diameter groove depth portion 23a provided at the tip 20a of the wiper arm 20 and a groove inlet portion 23b narrower than the groove depth portion 23a. The chamfered portions 29g and 29g of the cylindrical sliding portion 29b fitted to the fixed shaft 28 provided at the longitudinal center portion of the primary lever of the blade for wiping the window surface (not shown) are formed in the formed mounting groove 23. Attachable to a connecting posture position that is prevented from coming off from the inlet portion 23b, and a detachable posture position along the chamfered portions 29g and 29g along the groove inlet portion 23b that can be moved in and out of the groove inlet portion 23b. The structure to get. The dimension of the tip 20a of the wiper arm 20 in the wiper device 22 is long as shown in FIG. 19, and even when rotated, it interferes with the mounting bracket 27 of the primary lever of the blade, and the groove inlet provided at the tip 20a of the wiper arm 20 The portion 23 and the chamfered portions 29g and 29g of the cylindrical sliding portion 29b do not match as shown in FIG.

  However, the blade mounting structure in the wiper device 22 requires a stopper mechanism, which increases the manufacturing cost.

Therefore, it is conceivable that the posture of the wiper arm 30 itself can be changed from the position shown in FIG. 20 to the position shown in FIG. 21 without the stopper mechanism. The length of the tip 30a must be shorter than that shown in FIG. 18 so that the wiper arm 30 itself can be rotated.
International Publication No. 00/61409 Pamphlet

  However, in such a prior art, the groove inlet portion 23b provided at the tip 30a of the wiper arm 30 and the chamfered portions 29g and 29g of the cylindrical sliding portion 29b coincide as shown in FIG. The primary lever of the blade is inadvertently detached from the tip 30a of the arm 30.

  The present invention has been made by paying attention to such a conventional technique, eliminates the stopper mechanism, reduces the manufacturing cost, prevents the primary lever of the blade from being inadvertently detached from the tip of the wiper arm, and removes the wiper. Provided is a blade mounting structure in a wiper device that can share a blade even if the length from the tip of the arm to the mounting groove is different.

  According to the first aspect of the present invention, the attachment groove provided at the tip of the wiper arm supports the connecting shaft provided on the blade for wiping the window surface in a detachable and rotatable manner, and the attachment groove. Is a wiper device formed by forming a large-diameter groove back part and a groove inlet part narrower than the groove back part, wherein the connecting shaft is prevented from coming off from the groove inlet part And an axially detachable posture that can be freely moved in and out of the groove entrance.

  The invention according to claim 2 is the blade mounting structure in the wiper device according to claim 1, wherein the connecting shaft is rotatably supported by the blade in a direction around the shaft, A large diameter portion that is the same as the groove back portion and a chamfered portion on the outer periphery of the large diameter portion form a small diameter portion that is the same as the groove inlet portion of the mounting groove.

  A third aspect of the present invention is the blade mounting structure in the wiper device according to the first or second aspect, wherein the connecting shaft has a direction around the axis of a fixed shaft that is pivotally supported by a primary lever of the blade. The fixed shaft and the holder integrated with the primary lever are engaged with the primary lever so that the connecting shaft formed with the same small diameter portion as the groove entrance portion of the mounting groove is formed. It is characterized by sticking.

  According to the first aspect of the present invention, the connecting shaft is movably supported in a connecting posture in which the connecting shaft is prevented from coming off from the groove inlet portion and an attaching / detaching posture in which the connecting shaft can freely enter and exit from the groove inlet portion. Therefore, it is only necessary to change the posture of the connecting shaft, and the primary lever of the blade is not inadvertently detached from the tip of the wiper arm even though there is no stopper mechanism. Since there is no stopper mechanism, it is possible to provide a blade mounting structure in a wiper device that is inexpensive to manufacture. Since the blade can be shared with the wiper arms having different lengths from the tip to the mounting groove, mass production is possible, and the blade mounting structure in the wiper device can be manufactured at a low manufacturing cost.

  According to the second aspect of the present invention, the connecting shaft is pivotally supported by the blade so as to be rotatable in a direction around the shaft, and has the same large diameter portion as the groove deep portion of the attachment groove, and the large diameter portion. Since the same small diameter portion as the groove inlet portion of the mounting groove is formed by the chamfered portion of the outer periphery of the outer periphery, if the groove inlet portion of the mounting groove at the tip of the wiper arm and the small diameter portion of the connecting shaft are matched, The blade's connecting shaft can enter the groove entrance part of the wiper arm, and if the connecting shaft is rotated in the inserted state, the large diameter part larger than the groove entrance part faces the groove entrance part of the wiper arm. The connecting shaft of the blade does not come off from the groove entrance portion of the wiper arm.

  According to a third aspect of the present invention, the connecting shaft is pivotally supported by the fixed shaft that is pivotally supported by the primary lever of the blade so as to be rotatable about the axis, and the holder integral with the fixed shaft is the holder. By engaging with the primary lever, the direction of the connecting shaft formed by forming the same small diameter portion as the groove entrance portion of the mounting groove is fixed, so that the large diameter portion larger in diameter than the groove entrance portion is a wiper. The state facing the groove inlet of the arm is maintained, and the stable attachment state is maintained.

  To provide a blade mounting structure in a wiper device that can reduce the manufacturing cost, prevents the primary lever of the blade from being inadvertently detached from the tip of the wiper arm, and can share the blade even if the length from the tip of the wiper arm to the mounting groove is different. Therefore, the connecting shaft provided on the blade is pivotally supported in a connecting posture in which it is prevented from coming off from the groove inlet portion of the wiper arm and an attaching / detaching posture in which it can enter and exit from the groove inlet portion of the wiper arm. ,It was realized.

  Next, a first embodiment of the present invention will be described with reference to FIGS.

  In the figure, reference numeral 1 denotes a wiper arm made of synthetic resin. The wiper arm 1 has a base end attached to a pivot shaft P provided in a vehicle body (not shown), and is wiped back and forth integrally with the pivot shaft P. It swings. A blade 2 is supported at the tip of the wiper arm 1 so as to be rotatable and detachable as will be described later.

  At the tip of the wiper arm 1 of the first embodiment, as shown in FIG. 8, a mounting groove 3 having an opening on the lower side (blade 2 side) is formed in a state of being inclined toward the tip side of the wiper arm 1. Yes. The mounting groove 3 is formed by communicating a groove back part 3a and a groove inlet part 3b. The groove back part 3a is formed in an inner peripheral cylindrical shape having a diameter R (large diameter), and the groove inlet part 3b. Is a first groove side 3c formed in a straight line so as to coincide with a tangent line on the distal end side (left side in FIG. 8) of the groove back part 3a, and a base end side (right side in FIG. 8) of the groove back part 3a. ) And a second groove side 3d formed so as to be displaced toward the tip side beyond the tangential position, whereby the groove width S of the groove inlet portion 3b is smaller than the diameter R (large diameter). (S <R), which is a dovetail shape in side view.

  On the other hand, as shown in FIG. 1 and FIG. 2, the blade 2 includes at least a metal primary lever 4 and a blade rubber 6, and surrounds the periphery of the central portion in the longitudinal direction of the primary lever 4. The mounting bracket 7 formed in the state is fixed by the eyelet 5. As shown in FIG. 3, the dimension A is smaller than the diameter R of the groove depth portion 3 a of the mounting groove 3 between the mounting pieces 7 a and 7 a formed so as to stand upright in both short directions of the mounting bracket 7. A cylindrical fixed shaft 8 having a diameter X (R = A + X) is fixed.

  Reference numeral 9 denotes a holder that is incorporated in the fixed shaft 8 to engage the fixed shaft 8 and fix the blade 2 to the wiper arm 1. The holder 9 is made of synthetic resin and protrudes to the lever portions 9a, 9a adjacent to the mounting pieces 7a, 7a of the mounting bracket 7 and to the base end side (right side in FIG. 3) of the lever portions 9a, 9a. A cylindrical sliding portion 9b that is formed and is externally fitted to the fixed shaft 8 so as to be rotatable in the direction of the axis, and is formed so as to protrude outward from the distal end side (left side in FIG. 3) of the lever portions 9a and 9a. The mounting bracket 7 includes projecting pieces 9c and 9c that are detachably engageable with concave grooves 7b and 7b formed in the mounting pieces 7a and 7a. The cylindrical sliding portion 9b of the holder 9 rotates (slids) with the peripheral surface of the fixed shaft 8 as a rotation fulcrum, and the end 9f of the lever portions 9a, 9a is between the mounting pieces 7a, 7a of the mounting bracket 7. On the other hand, the swinging transformation between the standing posture (see FIGS. 6 and 7) protruding in a standing manner and the lying posture (see FIGS. 3 and 4) housed between the mounting pieces 7a and 7a of the mounting bracket 7 is performed. It is configured freely. The inner diameter of the cylindrical sliding portion 9b is formed to have the same dimension as the diameter X of the fixed shaft 8, and the outer diameter of the cylindrical sliding portion 9b is equal to the diameter R of the groove back portion 3a of the mounting groove 3. It is formed in the same dimension, The thickness of the cylindrical sliding part 9b is set to the dimension (refer FIG. 3) of the thickness dimension A / 2.

  Further, the cylindrical sliding portion 9b is formed with an opening 9d having a narrower dimension Y (X> Y) than the diameter X of the fixed shaft 8, and connects both end edges 9e, 9e of the opening 9d. The position is set so that the outer periphery of the fixed shaft 8 is substantially in contact with the virtual straight line L (see FIG. 3) (it may be just touching, or may protrude or sink somewhat within the allowable range from the virtual straight line L). ing. Here, the outer periphery of the fixed shaft 8 is substantially in contact with the virtual straight line L set by the opening 9d of the cylindrical sliding portion 9b, and the fixed shaft 8 does not easily come out of the cylindrical sliding portion 9b. Thereby, the fixed shaft 8 and the holder 9 are incorporated in a retaining shape. In this assembled state, the chamfered portions 9g and 9g formed at both ends 9e and 9e of the opening 9d of the cylindrical sliding portion 9b are formed, and the large-diameter portion R having the outer diameter of the cylindrical sliding portion 9b. And a small-diameter portion T that is perpendicular to the imaginary straight line L and passes through the axis of the fixed shaft 8 is formed in the chamfered portions 9g, 9g, and the small-diameter portion T is a groove in the groove inlet portion 3b. The size is set so that the diameter T is substantially equal to the width S or smaller than the width T (T ≦ S).

  When the lever portions 9a, 9a are in the lying posture (see FIGS. 3 and 4), the chamfered portions 9g, 9g of the opening 9d face the groove inlet portion 3b side of the mounting groove 3, and stand up (see FIG. 6, 7), the chamfered portions 9g and 9g of the opening 9d are set to face the opposite side of the first groove side 3c of the mounting groove 3. Incidentally, in the case where the virtual straight line L and the outer periphery of the fixed shaft 8 are just in contact with each other, or the outer periphery of the fixed shaft 8 slightly protrudes, the outer diameter X of the fixed shaft 8 and the cylindrical sliding portion 9b The sum of the thickness A / 2 corresponds to a small diameter T (X + 1 / 2A = T), and the small diameter T substantially matches the groove width S of the groove inlet portion 3b, but is smaller than this (T ≦ S) The dimensions are set.

  On the other hand, the lever portions 9a and 9a are formed with through-holes 9h that are continuous with the opening 9d of the cylindrical sliding portion 9b, and the lever portions 9a and 9a are mounted in a lying posture (see FIGS. 3 and 4). A guide groove 9 i is formed which is opened in the same direction as the groove 3. The groove width of the guide groove 9i is set so that the lever portions 9a, 9a are in a standing posture (see FIGS. 6 and 7) and become wider toward the blade 2 side.

  The holder 9 is assembled in advance into the primary lever 4 of the blade 2 before being attached to the wiper arm 1, and the assembly is performed by applying the groove end portion of the guide groove 9i to the fixed shaft 8, and the lever portion 9a, By pressing down 9a, the cylindrical sliding portion 9b is fitted and attached to the fixed shaft 8 in a force-fit manner.

  Next, a procedure for attaching / detaching the blade 2 to / from the wiper arm 1 in this configuration will be described.

When blade 2 is installed:
As shown in FIG. 10, the chamfered portions 9 g and 9 g of the cylindrical sliding portion 9 b of the holder 9 are arranged in the first position of the mounting groove 3 of the wiper arm 1. Set so as to be parallel to the groove side 3c. By doing so, the small diameter portion T of the cylindrical sliding portion 9b of the holder 9 and the groove entrance portion 3b of the mounting groove 3 of the wiper arm 1 are opposed to each other. As shown in FIG. 11, the mounting groove 3 of the wiper arm 1 is incorporated, and the holder 9 is placed in the lying down posture, so that the cylindrical sliding of the holder 9 with respect to the first groove side 3c of the mounting groove 3 of the wiper arm 1 is performed. The chamfered portions 9g and 9g of the portion 9b are substantially perpendicular to each other. By doing so, the large-diameter portion R of the cylindrical sliding portion 9b of the holder 9 and the groove inlet portion 3b of the mounting groove 3 of the wiper arm 1 face each other and cannot be removed.

When removing blade 2:
When the tip end 9f of the lever portion 9a of the holder 9 in the connected state is in the standing posture as shown in FIG. 10 again, the chamfered portions 9g and 9g of the cylindrical sliding portion 9b of the holder 9 become the wiper arm. The first mounting groove 3 is parallel to the first groove side 3c. When the mounting groove 3 of the wiper arm 1 is pulled out in this state, the connection between the cylindrical sliding portion 9b and the mounting groove 3 is released.

  As described above, according to the blade mounting structure in the wiper apparatus according to this embodiment, the cylindrical sliding portion 9b and the mounting groove 3 as the connecting shaft are connected to each other so as to be prevented from coming off from the groove inlet portion 3b. Since the shaft is movably supported so as to be movable in and out of the groove entrance portion 3b, it is only necessary to change the posture between the cylindrical sliding portion 9b as the connecting shaft and the mounting groove 3, and the stopper. Although the mechanism is not provided, the primary lever 4 of the blade 2 is not inadvertently detached from the tip of the wiper arm 1. Since there is no stopper mechanism, it is possible to provide a blade mounting structure in a wiper device that is inexpensive to manufacture. As shown in FIG. 12, the wiper arm 1 having a different length c from the tip 1 a to the mounting groove 3 also has a limit in the rotation allowance due to the tip 1 a of the wiper arm 1 hitting the mounting bracket 7. Since the blade 2 can be shared without coming off, mass production is possible, and the blade mounting structure in the wiper apparatus can be manufactured at a low manufacturing cost.

  The cylindrical sliding portion 9b, which is the connecting shaft, and the mounting groove 3 are pivotally supported by the mounting bracket 7 of the blade 2 so as to be able to rotate about the axis. Since the same large diameter portion R as the groove back portion 3a and the chamfered portions 9g, 9g on the outer periphery of the large diameter portion R form the same small diameter portion T as the groove inlet portion 3b of the mounting groove 3, a wiper arm If the groove entrance portion 3b of the mounting groove 3 at the tip 1a of 1 and the small diameter portion T of the cylindrical sliding portion 9b as the connecting shaft and the mounting groove 3 are matched, the groove entrance portion 3b of the wiper arm 1 is inserted. The cylindrical sliding portion 9b, which is the connecting shaft of the blade 2, and the mounting groove 3 can enter, and if the cylindrical sliding portion 9b, which is the connecting shaft, and the mounting groove 3 are rotated relative to each other in the inserted state, the groove entrance The large-diameter portion R having a diameter larger than that of the portion 3b is a groove inlet portion 3b of the wiper arm 1. Since facing, so that the cylindrical sliding portion 9b and the attachment groove 3 from the groove inlet 3b of the wiper arm 1 is coupled shaft of the blade 2 does not come off.

  The cylindrical sliding portion 9b, which is a connecting shaft, and the mounting groove 3 are supported by a fixed shaft 8 that is supported by the primary lever 4 of the blade 2 so as to be rotatable about the axis. When the integral holder 9 is engaged with the primary lever 4, the orientation of the connecting shaft cylindrical sliding portion 9 b and the mounting groove 3 formed with the same small diameter portion T as the groove entrance portion 3 b of the mounting groove 3. Therefore, the state where the large diameter portion R larger in diameter than the groove entrance portion 3b faces the groove entrance portion 3b of the attachment groove 3 of the wiper arm 1 is maintained, and a stable attachment state is maintained.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  In the second embodiment, the blade 2 side is the same as the first embodiment, and the wiper arm 10 side is different from the first embodiment.

  That is, the wiper arm 10 has a long dimension c ′ from the rotating shaft 8 to the tip 10a, and is otherwise the same as the wiper arm 1, and the wiper arm 10 can be attached to the mounting bracket even if the rotation angle is small. 7 shows that the rotation is limited and it is difficult to detach from the blade 2.

The front view which shows the blade attachment structure in the wiper apparatus which concerns on 1st Example of this invention. The perspective view which shows the braid | blade of FIG. The expanded sectional view which shows the attachment bracket and holder of the braid | blade of FIG. FIG. 4 is a perspective view showing a state where the holder is in a lying posture on the mounting bracket of FIG. 3. The perspective view which shows the state before a holder attaches to the attachment bracket of FIG. FIG. 6 is a perspective view showing a state after the holder is attached to the attachment bracket of FIG. 5. The expanded sectional view which shows the state of FIG. The front view of the front-end | tip part vicinity of the wiper arm of FIG. FIG. 9 is a top view of FIG. 8. The front view which shows the state just before a wiper arm attaches to the holder of FIG. The front view which shows the state which attached the wiper arm to the holder of FIG. The front view which shows the state which rotated the wiper arm of FIG. FIG. 9 is a front view corresponding to FIG. 8 according to a second embodiment of the present invention. FIG. 14 is a top view of FIG. 13. The front view which shows the state just before a holder attaches to the wiper arm of FIG. FIG. 14 is a front view showing a state where a holder is attached to the wiper arm of FIG. 13. The front view which shows the state which rotated the wiper arm of FIG. The front view which shows the state which attached the wiper arm to the conventional holder. The front view which shows the state which rotated the wiper arm of FIG. The front view which shows the state which attached the wiper arm to the other conventional holder. The front view which shows the state which rotated the wiper arm of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 10 Wiper arm 1a Tip of wiper arm 2 Blade 3 Mounting groove 3a Groove inner part 3b Groove inlet 3c First groove side 3d Second groove side 4 Primary lever 7 Mounting bracket 7a Mounting piece 7b Concave groove 8 Fixed shaft 9 Holder 9a Cylinder Sliding part 9d Opening 9g Chamfered part

Claims (3)

A connecting groove provided on the blade for wiping the window surface is detachably and pivotally supported in a mounting groove provided at the tip of the wiper arm, and the mounting groove includes a large-diameter groove depth portion and the groove. In the wiper device formed with a groove inlet portion that is narrower than the back portion, the connecting shaft is connected to the groove inlet portion so as to be prevented from coming off, and can freely enter and exit from the groove inlet portion. A blade mounting structure in a wiper device, wherein the blade mounting structure is pivotally supported in a detachable posture. The blade mounting structure in the wiper device according to claim 1, wherein the connecting shaft is pivotally supported by the blade so as to be rotatable in a direction around the shaft, and has a large diameter portion that is the same as a depth of the mounting groove. A blade mounting structure in a wiper device, wherein a chamfered portion on the outer periphery of the large diameter portion forms a small diameter portion that is the same as the groove entrance portion of the mounting groove. 3. A blade mounting structure in a wiper device according to claim 1 or 2, wherein the connecting shaft is pivotally supported by a fixed shaft pivotally supported by a primary lever of the blade so as to be rotatable about the axis. The fixed shaft and the holder are engaged with the primary lever so that the connecting shaft formed with the same small-diameter portion as the groove entrance portion of the mounting groove is fixed. Blade mounting structure in wiper device.

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