JP2005343370A - Wiper device of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper device of a construction machine capable of extending a wiping area of a windshield without providing a plurality of wiper blades and wiper motors. <P>SOLUTION: The wiper device of the construction machine has a wiper blade 2 which is turnably supported by a pin 2c and rocked to wipe a windshield 1. The wiper device comprises a link member 5 which is turnably supported at a diagonally upper position of the pin 2c, a sub blade 3 which is connected to the wiper blade 2 and the link member 5 via a pin 3a and a joint 3b inserted in a long hole in the sub blade to wipe the windshield 1, and a joint 6 to be connected to the wiper blade 2 and the link member 5. The distance between the pin 3a and the joint 3b, and the distance between connection parts of the joint 6 to be connected to the wiper blade 2 and the link member 5 are changed so that the wiper blade 2 is rocked so that the link member 5 maintains the parallel condition to the wiper blade 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The invention of this application relates to a wiper device for a construction machine that wipes a front window of a cab in a construction machine such as an excavator or a crane.

  In construction machines such as excavators and cranes, a wiper device is attached in front of the cab in order to wipe off dust such as rain water and earth and sand adhering to the front window of the cab. Such a wiper device is also attached to a general vehicle such as a passenger car. However, the general vehicle is provided only for securing a forward view during traveling. On the other hand, in construction machinery, the operator can clearly see the status of construction work by the front (construction machine) such as excavation work by excavator, construction dismantling work, and lifting and lowering work by crane. Since the wiper device is provided mainly for the purpose, the performance required for the wiper device is naturally different from that of a general vehicle.

  Therefore, an outline of a normal wiper device that has been provided in a construction machine until now will be described. The conventional normal wiper device of a construction machine is configured such that a base portion is rotatably supported on the front side of a front window of a cab and swings. And a wiper blade that wipes the front window and a wiper motor that is a power source for driving the wiper blade to swing. The wiper blades constituting this wiper device are usually equipped with an arm portion whose base portion is pivotally attached to the front side of the front window of the cab and is driven to swing, and an arm portion attached to this arm portion. A wiper blade body that wipes the front window of the cab of the construction machine by swinging is provided.

  The outline of the wiper blade will be described more specifically with reference to FIG. FIG. 4 schematically shows the locus when the wiper blade swings, and shows a state when viewed from outside the cab. On the left side of FIG. 4, the wiper blade main body is schematically shown by a line segment BC, and the arm portion of the wiper blade is schematically shown by a line segment AB. Further, this arm portion is rotatably supported at a point A on the left side of the front window and is driven by a wiper motor, whereby the wiper blade is driven to swing so that the front window is attached to the wiper blade body. Wipe with a part.

  When the construction machine is a hydraulic excavator, the driver's cab is placed on the left side of the swivel frame with the traveling direction as a reference, while the front is installed on the right side of the cab. Attach it to the left of the front window so that the right field of view is not lost when the blade is not driven. When the construction machine is a crane, the operator's cab is placed close to the right side of the swivel frame, while the front is installed on the left side of the operator's cab, so the arm of the wiper blade can be used when the wiper blade is not driven. Attach it to the right side of the front window to avoid losing the view on the left side.

  Comparing general vehicles such as passenger cars and construction machinery with respect to the functions required for wiper devices, in general vehicles such as passenger cars, the front window, especially the central part of the front window, should be wiped away sufficiently in order to ensure forward visibility. It is most important to improve visibility. On the other hand, in construction machines, in order to be able to check the work status at the front, not only the central part of the front window but also the left and right sides where the front is installed should be wiped away to improve the visibility. Most importantly, this point is fundamentally different between a wiper device for a construction machine and a wiper device for a general vehicle.

  When the wiper blade shown in FIG. 4 is driven by a wiper motor, the wiper blade body moves so as to draw an arc, and the upper arcuate chain line CC′-C ″ shown in FIG. The front window is wiped in an area between the chain line BB′-B ″. Therefore, in the conventional wiper device of a normal construction machine, the front window cannot be wiped particularly in the outer region of the upper arc-shaped chain line CC′-C ″. Therefore, rainwater and dust during construction work Is attached to the front window, the visual field on the right side of the front window, which is most important for a hydraulic excavator, is lost.

  This type of problem naturally occurs not only in hydraulic excavators, but also in construction machines such as cranes that attach the arm portion of the wiper blade to the right side of the front window. In construction machines such as hydraulic excavators and cranes, construction work is performed using a wide space in the vertical direction, so that the operator can see the work status through the front window. Unlike the front window, the front window has a long rectangular shape. For this reason, in a conventional normal wiper device of a construction machine, an area that cannot be wiped by the wiper blade is generated over a considerable range, particularly above one of the left and right sides of the front window.

As a technique for solving such a problem, Patent Document 1 discloses a wiper device for a construction machine cab such as a hydraulic excavator and a crane. In the conventional wiper device for a construction machine disclosed in Patent Document 1, the arm part of the wiper blade is pivotally mounted on the top and bottom of the front window of the cab so as to be pivotable, and each wiper blade is swung. A pair of wiper motors for driving in such a manner is installed corresponding to each wiper blade. The wiper device for a construction machine according to the related art having such a structure can be wiped by the upper and lower wiper blades of the front window so that the front window can be wiped off. The wiping area of the window can be enlarged, and the above problem can be solved.
CD-ROM (No. 4-5, FIG. 1) of the actual application No. 4-40578 (No. 5-92012)

  This conventional construction machine wiper device has such advantages, but it is necessary to provide a pair of wiper blades and a wiper motor, so that these devices are more than conventional construction machine wiper devices. Must be provided. Along with this, a transmission mechanism for transmitting the driving force of the wiper motor to the wiper blade must be provided in excess of the conventional normal construction machine wiper device, which increases the manufacturing cost of the wiper device. A new problem arises.

  The invention of this application was created in order to solve the problems found in the prior art, and the technical problem is that the wiping area of the front window is not provided with a plurality of wiper blades or wiper motors. It is an object of the present invention to provide a wiper device for a construction machine that can be expanded more than a wiper device for a construction machine.

  In order to achieve the above technical problem, in “a wiper device for a construction machine having a wiper blade that is driven so that the base is pivotably supported and swings to wipe the front window of the cab of the construction machine” When such a wiper device is configured, the first invention of this application according to claim 1 of the claims is configured as the following 1), and the second of this application according to claim 2 is configured. In the present invention, the following 2) is provided.

1) A link member that is rotatably supported at a position obliquely above the base of the wiper blade, and a wiper blade that is connected to each tip of the wiper blade and the link member so that the wiper blade can be pivoted about a fulcrum. When the wiper blade is swung by providing a sub-blade for wiping the front window with assistance and joints respectively connected to the intermediate portions of the wiper blade and the link member, the link member is moved accordingly. The distance between the connecting portions of the sub-blade to the wiper blade and the link member and the distance between the connecting portions of the joint to the wiper blade and the link member can be changed so as to swing while maintaining a parallel state with the wiper blade. Configured.

2) A link member that is rotatably supported at a position obliquely above the base portion of the wiper blade, and a wiper blade that is connected to each of the tip portions of the wiper blade and the link member so that the wiper blade side can be rotated as a fulcrum. A sub blade for wiping the front window with assistance is provided, and when the wiper blade is swung, the link member is swung while maintaining a parallel state with the wiper blade. The distance between the connecting portion of the sub-blade and the base portion of the link member can be changed.

  In the first invention of this application, since the wiper device of the construction machine is configured as described in 1) above, when the wiper blade is driven to oscillate, the wiper blade and the link member are moved accordingly. While changing the distance between the connecting portions of the sub blades and the distance between the connecting portions of the joints to the wiper blade and the link member, the wiper blade is connected to the link member so as to keep it in parallel with the two distances. Rock. That is, in the first half of the process in which the wiper blade swings up to an inclination line connecting the support part (base part) of the wiper blade and the support part (base part) of the link member, the wiper blade Prior to this, the link member is swung, and eventually overlaps the link member on the inclined line. Further, in the latter half of the process after this, the wiper blade swings the link member subsequently, while gradually increasing the two distances.

  In this way, the sub blade tilts in the process of swinging the link member in conjunction with the swing of the wiper blade. That is, in the first half process, the sub blade tilts so as to gradually increase the internal angle formed with the wiper blade, and when the wiper blade swings until reaching the tilt line, the sub blade tilts until the internal angle reaches 180 degrees. Next, in the latter half of the process, the sub blade tilts so as to gradually decrease the internal angle formed with the wiper blade. During these periods, the wiper blade wipes the front window by its swinging, but when the sub blade is tilted in this way, the area of the front window outside the wiper area of the wiper blade is wiped by the sub blade. can do.

  And, the wiping of the front window with such a sub blade can be achieved by swinging the link member in conjunction with swinging of one wiper blade with a wiper motor. According to this wiper device, it is possible to expand the wiping area of the front window as compared with a conventional normal wiper device without providing a plurality of wiper blades and wiper motors. By the way, in the conventional normal wiper device of a construction machine, the area where the front window should be wiped out is greatly enlarged in the vicinity of the diagonal of the front window, which is an intermediate passing point of the wiper blade. When the wiper blade swings on the inclined line, the sub blade is aligned with the outside of the wiper blade so that the wiper area of the front window at the sub blade is expanded to the maximum. Is designed to be positioned in the vicinity of the diagonal of the front window, it is possible to minimize the amount of unwiping of the front window.

  In the second invention of this application, since the wiper device of the construction machine is configured as described in 2) above, when the wiper blade is driven to swing, the sub blade to the link member is accompanied accordingly. The wiper blade swings the link member so as to maintain a parallel state with the distance between the connecting portion and the base portion of the link member being changed. That is, in the first half of the process in which the wiper blade swings to an inclination line connecting the support portion of the wiper blade and the support portion of the link member, the wiper blade moves the link member in advance, while gradually increasing the distance. It will be swung and will eventually overlap the link member on the inclined line. Further, in the latter half of the process after this, the wiper blade swings the link member subsequently, while gradually decreasing the distance.

  Thus, in the process of swinging the link member, the sub blade tilts in the same manner as in the first invention. That is, in the first half of the process, the sub blade tilts so as to gradually increase the internal angle formed with the wiper blade, and when the wiper blade swings until reaching the tilt line, the sub blade tilts until the internal angle reaches 180 degrees. In the latter half of the process, the sub-blade is tilted so as to gradually decrease its inner angle. Meanwhile, the sub blade wipes the area of the front window on the outer side of the wiper area of the front window with the wiper blade by the tilting.

  The wiping of the front window with such a sub-blade can be achieved by swinging one wiper blade with a wiper motor, like the wiper device of the first invention. Therefore, the construction of the second invention is performed. Even in the machine wiper device, the wiping area of the front window can be expanded as compared with a conventional normal wiper device without providing a plurality of wiper blades and wiper motors. Further, in the wiper device for a construction machine according to the present invention, as with the wiper device according to the first aspect, when the wiper blade swings up to the inclined line, the sub blade is aligned with the outside of the wiper blade. Side by side, the wiping area of the front window with the sub-blade is expanded to the maximum, so by designing the inclined line to be located near the diagonal of the front window, it is possible to minimize the wiping residue of the front window as much as possible. it can.

  As will be apparent from the following description, according to the first and second inventions of this application, “the base portion is rotatably supported and driven to swing, and the front window of the cab of the construction machine is In the case of constructing such a wiper device in the “wiper device for a construction machine provided with a wiper blade for wiping off”, the constructions of both inventions are constructed as described above in 1) and 2), respectively. According to the wiper device of the machine, the wiping area of the front window can be expanded as compared with a conventional normal wiper device without providing a plurality of wiper blades and wiper motors. As a result, the manufacturing cost of the wiper device can be reduced as compared with the wiper device for a construction machine according to the related art. Moreover, the construction machine wiper device of both inventions is obtained by adding a sub blade, a link member, etc. to the conventional construction machine wiper device without changing the basic structure of the conventional construction machine wiper device. When manufacturing a wiper device for a construction machine, it is possible to effectively use a conventional normal construction machine wiper device manufacturing apparatus without discarding it.

  Hereinafter, how the first invention and the second invention of this application will be actualized will be described with reference to FIGS. 1 to 7, and desirable modes for carrying out each invention will be described below. To clarify.

  FIG. 1 is a perspective view of a wiper device for a construction machine that embodies the first invention of this application, and FIG. 2 shows a connecting portion of a sub blade to a link member in the wiper device for a construction machine of FIG. FIG. 3 is a front view showing an enlarged view, FIG. 3 is a perspective view of the construction machine wiper device of FIG. 1 with a detailed view of the portion A, and FIG. 4 is an operation of the construction machine wiper device of FIG. FIG. 5 is a perspective view showing a scene of the first half operation of the wiper device of the construction machine of FIG. 1, and FIG. 6 is a scene of the second half operation of the wiper device of the construction machine of FIG. FIG. 7 is a diagram schematically showing the operation of the wiper device for a construction machine constructed by embodying the second invention of this application.

  1 and FIGS. 3 to 7 illustrate a state where the wiper device is viewed from the outside of the cab. Therefore, in the following description, left and right means the direction when viewed from the outside of the cab for convenience.

  The wiper device for a construction machine constructed by embodying the first invention and the second invention of this application to be described below is similar to the conventional normal construction machine wiper device described above. A wiper blade that is rotatably supported and driven to swing and wipes the front window of the cab of the construction machine is provided. First, an example of a wiper device for a construction machine according to a first invention will be described with reference to FIGS.

  In these drawings, reference numeral 1 denotes a front window of a driver's cab of a rectangular construction machine that forms a window in front of the cab, and 1a denotes a support member for a wiper blade fixed to the front window 1, and 2 denotes a base that pivots. A wiper blade 2a that is driven so as to be swingable and wipes the front window 1, 2a is an arm portion of the wiper blade 2 whose base is pivotally mounted on the front side of the front window 1, and 2b is this arm A wiper blade main body 2c as a wiping portion of the wiper blade 2 that is attached to the portion 2a and wipes the front window 1 is a pin for pivotally supporting the arm portion 2a on the support member 1a of the wiper blade. is there.

  The wiper blade 2 is composed of an arm portion 2a and a wiper blade main body 2b. The arm portion 2a is rotatably supported and is driven to swing by a wiper motor (not shown), whereby the wiper blade main body is driven. The front window 1 is wiped by swinging 2b. The wiper blade body 2b is attached to the arm 2a so as to be replaceable. Although not shown, a wiper motor for driving the arm 2a is attached to the window frame of the front window 1. The wiper motor drives the arm portion 2a of the wiper blade 2 to swing about the pin 2c by converting the rotational motion into a swinging motion by a mechanism (not shown). The structure described above is also provided with a conventional normal construction machine wiper device.

  3 is a sub-blade connected to the tip of the wiper blade 2 (tip of the wiper blade main body 2b) and the tip of the link member 5 to be rotatable about the wiper blade 2 side, and 3a is the sub-blade. 3 is a pin for pivotally supporting the left end of 3 on the tip of the wiper blade 2 and rotatably supporting the pin, and 3b has an intermediate portion near the left end of the sub blade 3 at the tip of the link member 5 as described later. A joint fixed to the link member 5 for connection, 4 is a bracket of an inverted L-shaped link member fixed to the front window 1, and 5 is a base portion of the wiper blade 2 (support portion by the pin 2c). A rod-shaped link member 5a rotatably supported at an obliquely upper position is a pin for pivotally supporting the link member 5 on the bracket 4, Is a telescopic joint which is connected by structure to be described later to each intermediate portion of the wiper blade 2 (arms 2a) and the link member 5.

  The sub blade 3 assists the wiper blade 2 and functions to wipe the area of the front window 1 outside the wiping area of the front window 1 in the wiper blade body 2b. When the base portion of the link member 5 is pivotally supported by the pin 5a at a position obliquely above the base portion of the wiper blade 2, in the example shown here, the link between the support portion (base portion) of the wiper blade 2 by the pin 2c and the pin 5a. An inclined line connecting the support portion (base portion) of the member 5 is positioned substantially on the diagonal line of the front window. The distance between the connecting portion of the sub-blade 3 to the wiper blade 2 and the connecting portion of the sub-blade 3 to the link member 5, that is, the distance between the pin 3a and the joint 3b can be freely changed according to the external force. Therefore, the wiper device of the construction machine has the structure shown in FIG. In addition, it is necessary to be able to freely change the distance between the connecting portion of the joint 6 to the wiper blade 2 and the connecting portion of the joint 6 to the link member 5. The apparatus has the structure shown in FIG.

  Accordingly, first, the structure of the wiper device shown in FIG. 2 will be described. In the side portion of the sub blade 3, a long hole 3c is formed along the longitudinal direction of the sub blade 3 at an intermediate portion near the left end portion. ing. A joint 3b fixed to the link member 5 is fitted into the long hole 3c of the sub blade 3 so as to be slidable in the longitudinal direction of the long hole 3c. By adopting such a structure, the wiper device of the present construction machine appropriately slides the joint 3b in the longitudinal direction of the long hole 3c to link the pin 3a, which is a connecting portion of the sub blade 3 to the wiper blade 2, and the link. While changing the relative position with the joint 3b which is the connection part of the sub blade 3 to the member 5, it is comprised so that the distance between both can be changed freely.

  Next, the structure of the wiper device shown in FIG. 3 will be described. When the joint 6 is connected to the wiper blade 2 (arm portion 2a) and the link member 5, the joint 6 is configured to be expandable and contractable. The end portion is connected to the wiper blade 2 and the link member 5 so as to be rotatable about an axis perpendicular to the paper surface. That is, as shown in the detailed view of the portion A attached to FIG. 3, the shaft portion 2d protrudes from the front side of the wiper blade 2, the shaft portion 5b protrudes from the back side of the link member 5, and the link member 5 is provided with a bearing portion 6a for rotatably mounting the shaft portion 2d of the wiper blade 2, and at the other end portion of the link member 5, the shaft portion 5b of the link member 5 is provided. A bearing portion 6b for rotatably mounting is provided.

  In order to configure the joint 6 to be extendable / contractable, a mechanism for expanding / contracting the joint 6 as seen in a cylinder or an antenna may be employed. The wiper device of the present construction machine is a connecting portion of the joint 6 to the wiper blade 2 by adopting the above structure and expanding and contracting the joint 6 with respect to the wiper blade 2 and the link member 5. The distance between the bearing portions 6a and 6b can be freely changed while changing the relative position between the bearing portion 6a and the bearing portion 6b which is a connecting portion of the joint 6 to the link member 5. ing.

  The operation of the wiper device of the construction machine having the above structure will be described with reference to FIGS.

  In FIG. 4, point A is the support part (base part) of the wiper blade 2 by the pin 2c, point C is the connection part of the sub blade 3 to the wiper blade 2 by the pin 3a, and point D is the support part of the link member 5 by the pin 5a. (Base part), point E represents the connecting part of the sub blade 3 to the link member 5 by the joint 3b. A line segment AB and a line segment BC schematically show the arm portion 2a and the wiper blade main body 2b of the wiper blade 2, respectively. The line segment CF and the line segment (dotted line) DE are respectively sub blade 3 The link member 5 is schematically illustrated. Since the joint 3b is inserted into the long hole 3c of the sub blade 3 and moves in the long hole 3c, the point E moves on the line CF within the range of the length of the long hole 3c. Therefore, the line segment CE expands and contracts.

  Now, assume that the wiper blade 2 starts to swing from a state where the wiper blade 2 stands on the left side of FIG. At this time, the joint 3b is located at the right end of the long hole 3c in FIG. First, the first half process in which the wiper blade 2 swings from this state to an inclined line connecting points A and D will be described. When the wiper blade 2 is driven to swing to the right, the joint 3b gradually moves to the left in the long hole 3c, and the connecting portion C of the sub blade 3 by the pin 3a and the sub blade by the joint 3b. 3, while reducing the distance between the connecting portions E of the joint 6 and gradually reducing the distance between the connecting portions of the joint 6 to the wiper blade 2 and the link member 5. The link member 5 is swung to the right so as to maintain a parallel state.

  At this time, the wiper blade 2 is swung so as to move the link member 5 ahead in conjunction with the swing of the wiper blade 2, and eventually the wiper blade 2 swings to an inclination line connecting the point A and the point D. And the link member 5 overlap. In the process in which the wiper blade 2 and the link member 5 perform such a movement, the sub blade 3 gradually rises and tilts so as to increase the internal angle (） ACF) with the wiper blade 2. When reaching the inclined line, the sub-blade 3 stands up completely and its internal angle becomes 180 degrees. FIG. 5 three-dimensionally illustrates a scene in the middle of the wiper device reaching such a state.

  In FIG. 4, the state of the wiper blade 2 when the wiper blade 2 reaches the inclined line is represented by a line segment AC ′, the state of the sub blade 3 is represented by a line segment C′F ′, and the state of the link member 5 Is represented by a line segment DE ′. Further, the joint 3b moves to the position of the point E 'and is located at the left end of the long hole 3c. The sub blades 3 are arranged outside the wiper blades 2 so as to be in line with the wiper blades 2 to maximize the wiping area of the front window 1. In the first half of the operation of the wiper device described above, the tip of the sub-blade 3 moves from F to F ', and the tip trajectory is almost linear.

  The latter half of the operation of the wiper device after this will be described. When the wiper blade 2 is continuously swung, the swing joint 3b is moved rightward in the long hole 3c, and the connecting portion C of the sub blade 3 by the pin 3a and the connecting portion E of the sub blade 3 by the joint 3b The wiper blade 2 is now followed by increasing the distance between them, and simultaneously increasing the distance between each joint of the joint 6 to the wiper blade 2 and the link member 5 by gradually extending the joint 6 at the same time. In this way, the link member 5 is swung to the right. At that time, the link member 5 still swings so as to be kept in parallel with the wiper blade 2.

In the process of the wiper blade 2 and the link member 5 performing such a movement, the sub blade 3 gradually tilts and tilts so as to reduce the internal angle (∠AC _x F _x ) with the wiper blade 2 and starts swinging. When it is swung about 90 degrees later, the inner angle becomes approximately 90 degrees. In FIG. 4, the state of the wiper blade 2 at this time is represented by a line segment AC ″, the state of the sub blade 3 is represented by a line segment C ″ F ″, and the state of the link member 5 is represented by a line segment DE ″. . Further, the joint 3b moves to the position of the point E ″, and is located at the right end of the long hole 3c as in the case of starting the swing. In the latter half of the operation of the wiper device, the tip of the sub blade 3 Is moving from F ′ to F ″, and the tip trajectory is not substantially linear.

  FIG. 6 is a three-dimensional illustration of a scene where the wiper device is in such a state. As described above, the process of dividing the operation of the wiper device is completed, and this time, the wiper blade 2 is driven to swing to the left. Then, the wiper device performs the same operation as described above while swinging the wiper blade 2 in the opposite direction.

  In the process in which the wiper device performs the above-described operation, the wiper blade 2 (wiper blade body 2b) has an upper arcuate chain line CC′-C ″ and a lower arcuate chain line B− shown in FIG. The front window 1 is wiped in a region between B′-B ″ (a region indicated by a diagonal line rising to the right in FIG. 4). The sub-blade 3 is surrounded by an upper straight line CFF ′, a right straight line F′-F ″ -C ″, and an arc-shaped chain line CC′-C ″. 4 wipes the front window 1 in the region (shown by the slanting line in FIG. 4) As a result, in the wiper device of the construction machine, the wiper blade 2 and the sub blade 3 complement each other, The left straight line BC, the upper straight line CFF ', the right straight line F'-F "-C", and the lower arc-shaped chain line BB'. The front window 1 is wiped in a wide area surrounded by -B ".

  Therefore, in the wiper device of the present construction machine, the wiping area of the front window 1 can be expanded as compared with the conventional normal wiper device of the construction machine that wipes the front window 1 only with the wiper blade 2. Then, the wiping of the front window 1 by such a wiper device is achieved by oscillating the link member 5 in conjunction with the wiping of the single wiper blade 2 by the wiper motor. According to this wiper device, it is possible to expand the wiping area of the front window 1 as compared with a conventional normal wiper device without providing a plurality of wiper blades 2 and wiper motors.

  As a result, in the wiper device of the present construction machine, the manufacturing cost of the wiper device can be reduced as compared with the wiper device of the construction machine according to the related art. In addition, the construction machine wiper apparatus adopts the structure without changing the basic structure of the conventional ordinary construction machine wiper apparatus, and adds the sub blade 3 and the link member 5 to the structure. Therefore, when manufacturing this, it is possible to effectively utilize a conventional manufacturing apparatus for a wiper device of a normal construction machine without discarding it.

  By the way, in the conventional wiper device of a normal construction machine, the area where the front window 1 is to be wiped off is remarkably enlarged in the vicinity of the diagonal of the front window 1, which is an intermediate passing point of the wiper blade 2, as shown in FIG. In other words, a wide unwiped area of the front window 1 is formed in the vicinity of the line segment C′F ′. In construction machines, in order to be able to check the work situation at the front, it is necessary to wipe off the left and right sides where the front is installed sufficiently to improve the field of view. Is a problem. On the other hand, in the wiper device of this construction machine, when the wiper blade 2 swings to reach the inclined line connecting the point A and the point D, the sub blade 3 is aligned with the outside of the wiper blade 2. Side by side, the wiping area of the front window 1 with the sub blade 3 is expanded to the maximum, so that the inclined line is positioned in the vicinity of the diagonal of the front window 1 so that the amount of unwiping of the front window 1 is reduced as much as possible. can do.

  In the wiper device of this construction machine, when the front window 1 is wiped, the wiper blade 2 and the sub blade 3 wipe the wiping area accurately without overlapping, so a wide area of the front window 1 is wasted. Can be wiped out. In that case, the upper and left and right side contours of the wiping area of the front window 1 are linearly formed by a straight line CFF ', a straight line BC, and a straight line F'-F "-C". If the specifications of the sub blade 3 and the link member 5 are appropriately set according to the standard of the front window 1, the rectangular front window 1 of the construction machine can be wiped evenly along the periphery.

  Finally, an example of a wiper device for a construction machine according to the second invention of this application will be described with reference to FIG.

  This construction machine wiper device is configured so that the link member 5 in the above-described construction machine wiper device can be expanded and contracted by employing an expansion and contraction mechanism found in a cylinder, an antenna, or the like. 3 is connected to the tip of the link member 5 by a pin 3c so as to be pivotable and immovable instead of being connected by a joint 3b, and the joint 6 is removed.

  That is, the link member 5 is supported so that the base portion can be pivoted obliquely above the base portion of the wiper blade 2, and the wiper blade 2 and the link member 5 have respective distal ends so that the wiper blade 2 can be pivoted about the fulcrum. When the wiper blade 2 is swung by providing a sub-blade 3 that is connected to assist the wiper blade 2 and wipes the front window 1, the link member 5 is brought into a state parallel to the wiper blade 2. The distance between the connecting portion of the sub-blade 3 to the link member 5 and the base portion of the link member 5 can be changed by expansion and contraction of the link member 5 so as to swing while maintaining.

  In the wiper device for a construction machine configured as described above, when the wiper blade 2 is driven to swing, the link member 5 supporting portion (base portion) D by the pin 5a and the pin 3c are associated therewith. While the distance (line segment DE) between the link member 5 and the connecting portion E of the sub blade 3 is changed by expanding and contracting the link member 5, the wiper blade 2 maintains the parallel state with the link member 5. 5 is swung. That is, in the first half of the process in which the wiper blade 2 swings to an inclination line connecting the support part A of the wiper blade 2 and the support part D of the link member 5, the wiper blade 2 increases the distance while gradually increasing the distance. The link member 5 is swung so as to be preceded, and eventually, the link member 5 is overlapped on the inclined line. In the latter half of the process after this, the wiper blade 2 swings the link member 5 so as to follow it while gradually decreasing the distance.

In the process of swinging the link member 5 in this way, the sub blade 3 tilts in the same manner as the example according to the first invention. That is, in the first half process, the sub blade 3 tilts so as to gradually increase the internal angle (角 ACF) formed with the wiper blade 2, and the wiper blade 2 tilts the support portion A and the support portion D. When it swings to reach the line, it tilts until its inner angle reaches 180 degrees, and in the latter half of the process, the sub blade 3 tilts so as to gradually decrease its inner angle (∠AC _x F _x ). Meanwhile, the sub blade 3 wipes the area of the front window 1 outside the wiping area of the front window 1 with the wiper blade 2 by its tilting. In the entire process of the operation of the wiper apparatus described above, the tip of the sub blade 3 moves as FF′-F _x -F ″, and the tip locus is as shown by the dotted line above FIG. It has a curved line shape that is symmetrical with respect to the inclined line.

  Then, the wiping of the front window 1 with the sub blade 3 can be achieved by swinging one wiper blade 2 with a wiper motor as in the example according to the first invention. Even in the apparatus, the wiping area of the front window 1 can be expanded more than the conventional wiper apparatus of a construction machine without providing a plurality of wiper blades 2 and wiper motors. As a result, in the wiper device of the present construction machine, the manufacturing cost of the wiper device can be reduced as compared with the wiper device of the construction machine according to the related art. In addition, the construction machine wiper apparatus adopts the structure without changing the basic structure of the conventional ordinary construction machine wiper apparatus, and adds the sub blade 3 and the extendable link member 5 to the structure. Therefore, the number of parts to be added is small, the structure is simple, and when manufacturing this, the conventional normal construction machine wiper device manufacturing equipment should be used effectively without being discarded. Can do.

  Furthermore, in the wiper device of the construction machine, as in the example according to the first aspect of the invention, when the wiper blade 2 swings up to the inclined line, the sub blade 3 is aligned with the outside of the wiper blade 2. In order to maximize the wiping area of the front window 1 with the sub-blade 3, the wiping area of the front window 1 is minimized as much as possible by setting the inclined line to be near the diagonal line of the front window 1. Can be reduced. Further, when the front window 1 is wiped, the wiper blade 2 and the sub blade 3 accurately wipe the wiping area without overlapping, so that a wide area of the front window 1 can be wiped without waste. it can.

It is a perspective view of the wiper apparatus of the construction machine which actualized and constituted the 1st invention of this application. It is a front view which expands and shows the connection part of the subblade to the link member in the wiper apparatus of the construction machine of FIG. It is the perspective view which looked at the wiper apparatus of the construction machine of FIG. It is a figure which shows typically operation | movement of the wiper apparatus of the construction machine of FIG. It is a perspective view which shows one scene of operation | movement of the first half of the wiper apparatus of the construction machine of FIG. It is a perspective view which shows one scene of operation | movement of the second half of the wiper apparatus of the construction machine of FIG. It is a figure which shows typically operation | movement of the wiper apparatus of the construction machine which actualized and comprised the 2nd invention of this application.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front window 1a Wiper blade bracket 2 Wiper blade 2a Arm part 2b Wiper blade main body 2c Pin 2d Shaft part 3 Sub blade 3a, 3c Pin 3b Joint 4 Link member bracket 5 Link member 5a Pin 5b Shaft part 6 Joint 6a, 6b Bearing part

Claims (2)

  In a wiper device for a construction machine having a wiper blade that wipes a front window of a cab of a construction machine by being rotatably supported and pivoted, the base is positioned obliquely above the base of the wiper blade. A link member that is rotatably supported, and a sub-blade that is connected to the wiper blade and each tip of the link member so as to be able to rotate about the wiper blade side as a fulcrum, and wipes the front window by assisting the wiper blade; When a wiper blade and a joint connected to each intermediate portion of the link member are provided, and the wiper blade is swung, the link member swings while maintaining a parallel state with the wiper blade. , The distance between each connecting portion of the sub blade to the wiper blade and the link member, and the wiper Wiper system for a construction machine, characterized by being configured so as changing the distance between the connecting portions of the joint to the blade and the link member.   In a wiper device for a construction machine having a wiper blade that wipes a front window of a cab of a construction machine by being rotatably supported and pivoted, the base is positioned obliquely above the base of the wiper blade. A link member that is rotatably supported, and a sub blade that is connected to the wiper blade and each tip of the link member so as to be rotatable about the wiper blade side and assists the wiper blade to wipe the front window. When the wiper blade is oscillated, the link member is oscillated while maintaining the parallel state with the wiper blade. A wiper device for a construction machine, characterized in that the distance between them can be changed.

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