JP2015161098A - Quick coupler, and industrial vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quick coupler capable of clearly displaying whether a lock pin is in an engagement position or not.SOLUTION: A quick coupler 100 includes: lock pins 30 and 31 movable between an engagement position where the lock pins engage with an attachment 120 and a non-engagement position where the lock pins do not engage with the attachment 120; and a display part 50 movable between a first position where the display part is hidden by a cover part 40 and a second position where the display part is exposed from the cover part 40 according to the movement of the lock pins 30 and 31. The display part 50 is positioned at one of the first position and the second position when the lock pins 30 and 31 are in the engagement position, and the display part 50 is positioned at the another of the first position and the second position when the lock pins 30 and 31 are in the non-engagement position.

Description

  Among industrial vehicles, wheel loaders and excavators have links (arms), and attachments such as buckets are attached to the ends of the links. The present invention relates to a quick coupler for easily attaching an attachment to the tip of this link.

  The quick coupler has a lock pin that engages with the attachment so that the attached attachment does not come off. The quick couplers described in the following Patent Documents 1 and 2 have a display portion on the back surface whose angular position changes in conjunction with the movement of the lock pin. According to such a configuration, the operator (driver) can visually check the angular position of the display unit, thereby confirming whether or not the lock pin is engaged with the attachment (engaged position).

Japanese Utility Model Publication No. 6-87448 No. 4-5569

  In the above quick coupler, the display unit is always visible to the operator regardless of whether the lock pin is in the engaged position or the non-engaged position. For this reason, it is difficult to determine whether the lock pin is in the engaged position or the non-engaged position at first glance, and it must be determined based on the angular position of the display section. In addition, even if the operator is in a relatively small place such as a driver's seat, the appearance of the display unit changes depending on the angle of the operator's viewing, etc., so there is a risk of misidentifying whether the lock pin is in the engaged position. There is.

  In view of the circumstances as described above, the present invention can clearly display whether or not the lock pin is in the engaged position, and the operator can quickly determine whether or not the lock pin is in the engaged position. It aims to provide a quick coupler that can be used.

  A quick coupler according to an aspect of the present invention is a quick coupler for attaching an attachment to a link of an industrial vehicle. A lock pin that moves between the engagement positions, a cover portion that is located on the back surface portion of the quick coupler body, a first position that is hidden by the cover portion as the lock pin moves, and is exposed from the cover portion. And a display unit that moves between the second position and the display unit is located in one of the first position and the second position when the lock pin is in the engagement position. When the lock pin is in the disengaged position, the display unit is located at the other of the first position and the second position.

  According to such a configuration, it can be confirmed whether or not the lock pin is in the engaged position by visually observing whether or not the display unit is hidden behind the cover unit. The confirmation of whether or not the display unit is hidden by the cover unit is not performed by determining where the angular position of the display unit is, but is determined by whether or not the display unit is visible. It is hardly affected by the viewing angle of the person. In particular, when the worker is in the driver's seat, the display unit can be confirmed without affecting the viewing angle of the worker. That is, according to said structure, the display about whether a lock pin exists in an engagement position is clear, and it can prevent misidentification.

  In the quick coupler, the display unit is in the first position when the lock pin is in the engagement position, and is in the second position when the lock pin is in the non-engagement position. It may be. In this case, while the industrial vehicle is working, that is, while the lock pin is engaged with the attachment, the display unit is in a position hidden behind the cover unit. Therefore, the display unit does not come into contact with trees or stones during work, and the display unit can be prevented from being damaged.

  In the quick coupler, the cover member may cover the display unit from at least the upper surface side and the rear surface side when the display unit is in the first position. According to this configuration, it is possible to reliably prevent the display unit from being damaged while the industrial vehicle is working.

  In the quick coupler, the display unit may be exposed outside the quick coupler main body when the lock pin is in the non-engagement position. According to such a configuration, since the display unit is positioned outside the link, the visibility of the display unit from the driver's seat of the industrial vehicle is not easily affected by the shape and arrangement of the members constituting the link. Therefore, such a quick coupler can be used regardless of the link configuration.

  In the above quick coupler, the cover portion may have an opening, and the display portion may be exposed from the opening when the lock pin is in the non-engagement position. According to this structure, a display part can be visually observed through the clearance gap between the members which comprise a link.

  Further, in the above quick coupler, when the lower end of the entire working machine including the attachment, the link, and the quick coupler is at a predetermined height position, the opening is connected to the link from the driver's seat of the industrial vehicle. It is arrange | positioned in the position which can be visually observed through the clearance gap between each member which comprises. According to such a configuration, when the lower end of the attachment is at a predetermined height position, the opening can be visually observed from the driver's seat, and as a result, it can be confirmed whether or not the lock pin is in the engagement position.

  In the quick coupler, the predetermined height position may be a minimum ground height position of the industrial vehicle. According to such a configuration, it is possible to reliably and easily visually check the display unit from the driver's seat at a position where it is highly necessary to visually check the display unit, that is, when the lower end of the attachment is at the lowest ground position of the industrial vehicle.

  Furthermore, the industrial vehicle which concerns on one form of this invention is equipped with said quick coupler.

  According to the above quick coupler, it is possible to clearly display whether or not the lock pin is in the engaged position, and the operator can quickly determine whether or not the lock pin is in the engaged position.

FIG. 1 is a left side view of an industrial vehicle provided with a quick coupler according to the first embodiment. FIG. 2 is an enlarged view of the vicinity of the link of the industrial vehicle shown in FIG. FIG. 3 is a view showing an operation of attaching an attachment to the quick coupler shown in FIG. FIG. 4 is a rear view of the quick coupler shown in FIG. 1 when the lock pin is in the engaged position. FIG. 5 is a rear view of the quick coupler shown in FIG. 1 when the lock pin is in a non-engagement position. 6 is a longitudinal sectional view of FIG. FIG. 7 is a rear view of the quick coupler according to the second embodiment when the lock pin is in the non-engagement position. FIG. 8 is a longitudinal sectional view of FIG. FIG. 9 is a plan view of the display unit driving mechanism shown in FIG. FIG. 10 is a cross-sectional view illustrating a modification of the quick coupler according to the second embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. Below, the same code | symbol is attached | subjected to the element which is the same or it corresponds through all the drawings, and the overlapping description is abbreviate | omitted.

(First embodiment)
First, the quick coupler 100 according to the first embodiment will be described. In the following description, the upper, lower, left, and right when viewed from the driver's seat 110 (see FIG. 1) are simply referred to as “upper”, “lower”, “left”, and “right”, respectively. Further, in the quick coupler 100 and the attachment 120, “rear surface” refers to a surface that can be seen from the driver's seat 110. That is, the back surface of the quick coupler 100 is a surface opposite to the surface of the quick coupler 100 to which the attachment 120 is attached.

<Outline of quick coupler>
First, an outline of the quick coupler 100 will be described. FIG. 1 is a left side view of an industrial vehicle 101 provided with a quick coupler 100. As shown in FIG. 1, the industrial vehicle 101 has a link 102, and a quick coupler 100 is attached to the tip of the link 102. Although the industrial vehicle 101 shown in FIG. 1 is a wheel loader, the industrial vehicle of the present invention is not limited to a wheel loader. For example, the industrial vehicle 101 may be a shovel car or a bulldozer.

  FIG. 2 is an enlarged view of the vicinity of the link 102 of the industrial vehicle 101 shown in FIG. As shown in FIG. 2, the link 102 has a Z-link structure, and the quick coupler 100 is connected to a lift arm 103 and a rod 104 positioned at the tip of the link 102. The lift arm 103 has side plates (left side plate and right side plate) 111 on both the left and right sides. The left and right side plates 111 are positioned at the left outer portion and the right outer portion of the link 102, respectively, and are driven by a hydraulic lift cylinder 105, respectively. When the lift cylinder 105 expands and contracts, the angle of the lift arm 103 changes and the quick coupler 100 can be moved in the vertical direction. The left and right side plates 111 of the lift arm 103 are connected to each other by a cross pipe 106 extending in the left-right direction.

  On the other hand, the rod 104 is positioned between the left and right lift arms 103 and is connected to a hydraulic tilt cylinder 108 via a lever 107. The lever 107 is rotatably held by a support member 109 provided on the cross pipe 106. Then, when the tilt cylinder 108 expands and contracts, the front-rear position of the rod 104 changes, and the front-rear angle of the quick coupler 100 can be changed. In this embodiment, the rod 102, the lever 107, and the tilt cylinder 108 included in the link 102 are one set. However, if the industrial vehicle 101 is large, there may be two sets. In this case, the rod attachment portions 19 of the quick coupler 100 may be provided at two locations according to the rod 104 or the like. The link 102 is not limited to the Z link type structure. For example, the link 102 may have a parallel link structure.

  FIG. 3 is a diagram illustrating an example of an operation for attaching the attachment 120 to the quick coupler 100. In FIG. 3, a bucket is shown as an example of the attachment 120, but there are many types of attachments 120 other than buckets, such as forks and plows. As shown in FIG. 3, the attachment 120 that is a bucket includes a bucket main body 125 and an engagement portion 122 provided at the rear of the bucket main body 125. The engaging portion 122 is a portion that is attached to the quick coupler 100 and has a hook 121, an engaging hole 123, and a receiving portion 124. The operation of attaching the attachment 120 placed on the ground to the quick coupler 100 is generally performed as follows.

  First, as shown in FIG. 3A, the quick coupler 100 is tilted in the front-rear direction so that the upper part is forward, and is brought close to the rear surface of the attachment 120. Subsequently, as shown in FIG. 3B, the hitch 22 (see FIG. 4) of the quick coupler 100 is hooked on the hook 121 provided on the attachment 120. Subsequently, from the state shown in FIG. 3B, the quick coupler 100 is moved upward, and the entire work machine 112 including the attachment 120, the link 102, and the quick coupler 100 is at least to the lowest ground level (work machine 112 Lift up until the lower edge of the bottom reaches the ground clearance. The “minimum ground height position” refers to the height position of the bottom surface of the industrial vehicle 101. Then, with the work implement 112 as a whole raised to the lowest ground level, as shown in FIG. 3C, the quick coupler 100 is moved back and forth so that the upper part moves backward (clockwise in FIG. 3C). Tilt in the direction. Accordingly, the lower shaft member 21 (see FIG. 4) of the quick coupler 100 abuts on the receiving portion 124 of the attachment 120, and the attachment 120 is positioned with respect to the quick coupler 100. Finally, the lock pins 30 and 31 (see FIG. 4) of the quick coupler 100 are inserted into the engagement holes 123 formed in the engagement portion 122 of the attachment 120.

<Details of quick coupler>
Next, a detailed configuration of the quick coupler 100 will be described. 4 and 5 are rear views of the quick coupler 100. FIG. 4 and 5 are views of the quick coupler 100 as viewed from the driver's seat 110 (see FIG. 1) of the industrial vehicle 101. FIG. 4 shows a state in which the right lock pin 30 and the left lock pin 31 are in an engagement position where the right lock pin 30 and the left lock pin 31 are engaged with the attachment 120. FIG. It shows when in the engaged position.

  As shown in FIGS. 4 and 5, the quick coupler 100 includes a quick coupler main body 10, a right lock pin 30 and a left lock pin 31, a cover unit 40, and a display unit 50. Hereinafter, each of these components will be described in order.

  The quick coupler body 10 includes a right outer plate member 11, a right inner plate member 12, a central right plate member 13, a central left plate member 14, a left inner plate member 15, and a left outer plate member 16 in order from the right side. . These plate members 11 to 16 are all formed in a plate shape, and are perpendicular to the left-right direction and arranged in parallel to each other.

  The right outer plate member 11 and the right inner plate member 12 are located on the right side portion of the quick coupler main body 10. The right outer plate member 11 and the right inner plate member 12 have a lift arm attachment portion 17 to which a lift arm 103 (see FIG. 2) of the industrial vehicle 101 is attached via a hinge pin (not shown) in a lower portion. . Further, the right outer plate member 11 and the right inner plate member 12 have cylindrical sleeves 18 through which the right lock pin 30 passes through the opposing surfaces. Both sleeves 18 are provided at a distance from each other, and an engaging portion 122 (see FIG. 3) of the attachment 120 is inserted between the sleeves 18.

  The center right plate member 13 and the center left plate member 14 are located in the center portion of the quick coupler body 10 in the left-right direction. The central right plate member 13 and the central left plate member 14 have a rod attachment portion 19 to which a rod 104 (see FIG. 2) of the industrial vehicle 101 is attached at the central portion in the vertical direction. 6 is a longitudinal sectional view of FIG. Specifically, FIG. 6 is a cross-sectional view of the quick coupler main body 10 shown in FIG. 5 divided into front and rear (a back side portion and a front side portion of the paper surface) and a vertical plane passing through each sleeve 18. As shown in FIG. 6, the central right plate member 13 and the central left plate member 14 are partly cut out in the central portion in the vertical direction. Thus, an internal space in which a lock pin drive mechanism 32 (to be described later) can be disposed is formed between the right inner plate member 12 and the left inner plate member 15 in the quick coupler main body 10.

  The left inner plate member 15 and the left outer plate member 16 are located on the left side portion of the quick coupler body 10. As shown in FIGS. 4 and 5, the left inner plate member 15 and the left outer plate member 16 are attached to a lift arm 103 to which the lift arm 103 (see FIG. 2) of the industrial vehicle 101 is attached via a hinge pin (not shown). A portion 17 is provided in the lower part. Further, the left inner plate member 15 and the left outer plate member 16 have cylindrical sleeves 18 through which the left lock pin 31 passes through the opposing surfaces. Both sleeves 18 are provided at a distance from each other, and an engaging portion 122 (see FIG. 3) of the attachment 120 is inserted between the sleeves 18.

  The quick coupler main body 10 has an upper shaft member 20 located in the upper portion and a lower shaft member 21 located in the lower portion. Among these, the upper shaft member 20 is a columnar member extending in the left-right direction. The upper shaft member 20 connects the upper portions of the plate members 11 to 16. Of the upper shaft member 20, a portion located between the right outer plate member 11 and the right inner plate member 12 and a portion located between the left inner plate member 15 and the left outer plate member 16 are hooks 121 of the attachment 120. A hitch 22 for hooking (see FIG. 3) is configured. The lower shaft member 21 is a columnar member extending in the left-right direction. The lower shaft member 21 connects the lower portions of the plate members 11 to 16. In a state where the attachment 120 is attached to the quick coupler 100, the lower shaft member 21 abuts on the receiving portion 124 of the attachment 120 (see FIG. 3C).

  The right lock pin 30 and the left lock pin 31 are members for fixing the attachment 120 to the quick coupler 100. As shown in FIG. 6, the right lock pin 30 moves in the sleeve 18 provided in the right outer plate member 11 and the right inner plate member 12. Further, the left lock pin 31 moves in a sleeve 18 provided in the left inner plate member 15 and the left outer plate member 16. The right lock pin 30 and the left lock pin 31 are driven by a lock pin drive mechanism 32 described below.

  The lock pin drive mechanism 32 includes a connecting member 33 and a hydraulic lock pin cylinder 34. Among these, the connecting member 33 has a right vertical part 35, a left vertical part 36, and a horizontal part 37. The right vertical portion 35 has a lower end portion fixed to the base end (left end) of the right lock pin 30, and the left vertical portion 36 has a lower end portion fixed to the base end (left end) of the left lock pin 31. The horizontal portion 37 penetrates the left inner plate member 15 and the left outer plate member 16 and connects the upper end portion of the right vertical portion 35 and the upper end portion of the left vertical portion 36. 4 and 5, the left end portion of the horizontal portion 37 and the left vertical portion 36 of the connecting member 33 are located on the left side of the quick coupler body 10.

  The lock pin cylinder 34 has a right lock pin 30 fixed to the tip of the cylinder rod. Thereby, when the lock pin cylinder 34 changes from the contracted state to the extended state, the right lock pin 30 moves to the right. Along with this, the connecting member 33 moves to the right, and the left lock pin 31 also moves to the right in conjunction with it. When the lock pin cylinder 34 is in a contracted state, as shown in FIG. 5, the tip of the right lock pin 30 is located in the sleeve 18 provided on the right inner plate member 12, and the tip of the left lock pin 31. Is located in a sleeve 18 provided on the left outer plate member 16. Therefore, the attachment 120 is engaged between the sleeve 18 provided on the right outer plate member 11 and the right inner plate member 12 and between the sleeve 18 provided on the left inner plate member 15 and the left outer plate member 16. The part 122 (see FIG. 3) can be taken in and out. That is, the right lock pin 30 and the left lock pin 31 are in the disengaged position.

  On the other hand, when the lock pin cylinder 34 is in the extended state, as shown in FIG. 4, the right lock pin 30 passes both sleeves 18 provided on the right outer plate member 11 and the right inner plate member 12. , Appearing between these sleeves 18. Similarly, the left lock pin 31 also appears between these sleeves 18 so as to pass both sleeves 18 provided on the left inner plate member 15 and the left outer plate member 16. At this time, the right lock pin 30 and the left lock pin 31 can be inserted into the engagement hole 123 (see FIG. 3) formed in the engagement portion 122 of the attachment 120 and engaged with the engagement hole 123. it can. That is, the right lock pin 30 and the left lock pin 31 are in the engaged position.

  The cover portion 40 is a member located on the back surface portion of the quick coupler main body 10. The cover part 40 has three central covers 41, 42, 43 and a connecting member cover 44. The central covers 41, 42, 43 are respectively located between the right inner plate member 12 and the central right plate member 13, between the central right plate member 13 and the central left plate member 14, and between the central left plate member 14 and the left. It is arranged between the inner plate member 15. The above-described lock pin cylinder 34 and the like are covered by these central covers 41, 42, 43 from the back side. The connecting member cover 44 is disposed between the left inner plate member 15 and the left outer plate member 16, and a portion of the connecting member 33 located between the left inner plate member 15 and the left outer plate member 16 is disposed. Cover at least from the back side. From the viewpoint of protecting a portion of the connecting member 33 located between the left inner plate member 15 and the left outer plate member 16, the connecting member cover 44 is configured to cover the portion from the upper surface side and the rear surface side. Is preferred.

  The display unit 50 is a part that displays whether or not the right lock pin 30 and the left lock pin 31 are in the engaged position. The display unit 50 according to the present embodiment is a plate-like member having a color different from that of parts other than the display unit 50 constituting the quick coupler 100. For example, the entire quick coupler 100 may be painted yellow and the display unit 50 may be painted red. As shown in FIG. 6, the display unit 50 is attached to the left end portion of the horizontal portion 37 of the connecting member 33. As shown in FIG. 4, when the right lock pin 30 and the left lock pin 31 are in the engaged position, the display unit 50 is hidden by the connecting member cover 44. That is, the display unit 50 has a position (first position) where the whole is hidden by the cover part 40 (the connecting member cover 44) and a position where the whole is exposed from the cover part 40 (second state) as the lock pins 30 and 31 move. Position). As shown in FIG. 5, when the right lock pin 30 and the left lock pin 31 are in the non-engagement position, the display unit 50 is exposed on the left side (outside) of the quick coupler body 10. The display unit 50 may be fixed to the connecting member 33 using a bolt or by welding.

  The above is the configuration of the quick coupler 100 according to the present embodiment. According to such a configuration, an operator (driver) of the industrial vehicle 101 can reliably and easily determine whether or not the lock pins 30 and 31 are in the engaged position by visually checking the display unit 50. can do. That is, whether or not the lock pins 30 and 31 are in the engaged position is not determined by determining where the angular position of the display unit 50 is, but by whether or not the display unit 50 is visible. Done. Therefore, the display unit 50 does not appear to be hidden by the cover unit 40 or exposed, depending on the viewing angle of the operator, so whether or not the lock pins 30 and 31 are in the engaged position. Can prevent misunderstandings about In particular, when the worker is in the driver's seat, the display unit can be confirmed without affecting the viewing angle of the worker. Further, according to the quick coupler 100 according to the present embodiment, the display unit 50 is attached to the cover unit 40 while the industrial vehicle 101 is working, that is, when the lock pins 30 and 31 are in the engaged position. Since it is in a hidden position, damage to the display unit 50 can be prevented. Furthermore, in the quick coupler 100 according to the present embodiment, the display unit 50 moves in the same direction as the movement direction of the right lock pin 30 and the left lock pin 31, and thus a mechanism for changing the direction of the force is unnecessary. Therefore, the configuration of the quick coupler 100 can be simplified.

(Second Embodiment)
Next, the quick coupler 200 according to the second embodiment will be described. FIG. 7 is a rear view of the quick coupler 200 according to the present embodiment when the right lock pin 30 and the left lock pin 31 are in the disengaged position. As shown in FIG. 7, the quick coupler 200 according to this embodiment is the first embodiment in that the display unit 50 is exposed from the opening 45 when the right lock pin 30 and the left lock pin 31 are in the disengaged position. The configuration is different from the quick coupler 100 according to the embodiment. Details will be described below.

  As shown in FIG. 7, the center cover 41 located between the right inner plate member 12 and the central right plate member 13 and the center cover 43 located between the central left plate member 14 and the left inner plate member 15. Each has an opening 45 formed therein. The opening 45 is located below the center in the up-down direction of the center covers 41, 43 and outside the center in the left-right direction of each center cover 41, 43.

  However, the position where the opening 45 is formed is not limited to this. The opening 45 may be in a position where it can be seen from the driver's seat 110 of the industrial vehicle 101 through the gaps between the members 103 to 109 constituting the link 102. Furthermore, considering the attachment work of the attachment 120, the opening 45 has a lower end of the work implement 112 from the lowest ground level to a horizontal position (a straight line connecting the arm pin 113 supporting the hoist arm 103 and the lift arm attachment part 17). It is preferable that visual observation is possible somewhere between the position up to and parallel to the ground. In particular, the opening 45 is preferably visible when the lower end of the work implement 112 is at the lowest ground level. As described with reference to FIG. 3, the lock pins 30 and 31 are generally inserted into the engagement holes 123 of the attachment 120 in a state where the lower end of the attachment 120 is at the lowest ground height position of the industrial vehicle 101. Therefore, if the opening 45 is formed at the above-described position, it can be efficiently determined whether or not the lock pins 30 and 31 are in the engaged position.

  FIG. 8 is a cross-sectional view of FIG. 7 and corresponds to FIG. 6 of the first embodiment. As shown in FIG. 8, the quick coupler 200 has two display portions 50, and both display portions 50 are located inside the quick coupler main body 10. In addition, all the display units 50 are provided so that the position in the vertical direction is the same as that of the opening 45. As shown in FIG. 8, the right display unit 50 is driven by a right display unit drive mechanism 51, and the left display unit 50 is driven by a left display unit drive mechanism 52.

  FIG. 9 is a plan view of both display unit driving mechanisms 51 and 52. 9 is the front side of the quick coupler 200, and the lower side of the page is the back side of the quick coupler 200. FIG. 9A shows a state in which the right lock pin 30 and the left lock pin 31 are in the disengaged position, and FIG. 9B shows that the right lock pin 30 and the left lock pin 31 are in the engaged position. It shows a certain time.

  As shown in FIG. 9A, the right display unit drive mechanism 51 includes a holding member 53, a receiving member 54, a slide member 55, and an urging member 56. The holding member 53 is a member that holds the right display unit 50. The receiving member 54 is a plate-like member that is connected to the holding member 53 and has a slit 57 (see FIG. 8) formed in the horizontal direction. The slide member 55 is a plate-like member that has a proximal end portion fixed to the right lock pin 30 and a distal end portion that passes through a slit 57 formed in the receiving member 54. The urging member 56 is a spring disposed between the holding member 53 and the right inner plate member 12.

  When the right lock pin 30 moves to the right from the non-engagement position shown in FIG. 9A, the slide member 55 moves to the right in the slit 57 formed in the receiving member 54. When the slide member 55 reaches the right end portion of the slit 57, the slide member 55 pushes the holding member 53 to the right via the receiving member 54. As a result, the urging member 56 is contracted, and the right display drive mechanism 51 is in the state shown in FIG. At this time, the right display unit 50 is located on the right side of the opening 45 formed in the central cover 41 and is hidden by the central cover 41.

  On the contrary, when the right lock pin 30 moves to the left from the engagement position shown in FIG. 9B, the urging member 56 pushes the holding member 53 to the left, and the display unit 50 moves to the position shown in FIG. ) To the disengaged position shown in FIG. At this time, the right display unit 50 is positioned in the same horizontal direction as the opening 45 formed in the central cover 41 and is exposed from the opening 45.

  As shown in FIG. 9A, the left display unit driving mechanism 52 includes a holding member 58, a link member 59, and a biasing member 60. The holding member 58 is a member that holds the left display unit 50. The link member 59 has a proximal end connected to the holding member 58 and a distal end located inside the sleeve 18 provided on the left inner plate member 15 (see FIG. 8). The biasing member 60 is a spring disposed between the holding member 58 and the left inner plate member 15.

  When the left lock pin 31 moves rightward from the non-engagement position shown in FIG. 9A and the tip of the left lock pin 31 contacts the link member 59, the link member 59 rotates (in FIG. 9, clockwise). The holding member 58 is pushed leftward. As a result, the urging member 60 is contracted, and the left display portion drive mechanism 52 is in the state shown in FIG. At this time, the left display unit 50 is located on the left side of the opening 45 formed in the central cover 43 and is hidden by the central cover 43.

  On the contrary, when the left lock pin 31 moves leftward from the engagement position shown in FIG. 9B, the urging member 60 pushes the holding member 58 rightward, and the link member 59 rotates ( In FIG. 9, counterclockwise), the left display unit 50 returns to the disengaged position shown in FIG. At this time, the left display unit 50 is located in the same horizontal direction as the opening 45 formed in the central cover 43 and is exposed from the opening 45.

  The above is the configuration of the quick coupler 200 according to the present embodiment. As described above, also in the case of the quick coupler 200 according to the present embodiment, the display unit 50 is located at the position where the entire display unit 50 is hidden by the cover unit 40 (the central covers 41 and 43) in accordance with the movement of the lock pins 30 and 31. Position) and a position where the whole is exposed from the cover portion 40 (second position). In the above description, the case where the display unit 50 held by the holding members 53 and 58 is driven by the lock pins 30 and 31 via a link or the like has been described. However, the configuration for driving the display unit 50 is limited to this. Absent. For example, the display unit 50 may be driven by directly attaching the display unit 50 to the connecting member 33.

  In the case of the quick coupler 100 according to the first embodiment, when the industrial vehicle 101 becomes large, the display unit 50 is hidden by members (particularly, the lift arm 103) constituting the link 102, and the display unit 50 is visually observed from the driver's seat 110. It may be difficult to do. On the other hand, according to the quick coupler 200 according to the present embodiment, the display unit 50 is visually observed from the driver's seat 110 through the gaps between the members 103 to 109 constituting the link 102. Therefore, unlike the case of the first embodiment, when the industrial vehicle 101 becomes larger, the gap between the members constituting the link 102 becomes larger, so that the display unit 50 becomes easier to see.

  In addition, when the lock pins 30 and 31 are in the non-engagement position as in the present embodiment, the configuration in which the display unit 50 is exposed from the opening 45 formed in the cover unit 40 is a right-side lock as illustrated in FIG. It can also be employed in a quick coupler that moves both the pin 30 and the left lock pin 31 from the inner side to the outer side in the left-right direction. In the quick coupler shown in FIG. 10, the display unit 50 is directly fixed to the right lock pin 30 and the left lock pin 31. Further, the lock pin cylinder 34 is not fixed to the quick coupler 100 in the left-right direction (axial direction), and the movable range in the left-right direction is limited by a stopper (not shown). When the lock pin cylinder 34 is contracted and the lock pins 30 and 31 are in the disengaged position, the opening 45 is formed at a position where the display unit 50 and the opening 45 (see FIG. 7) overlap. When the lock pin cylinder 34 changes from the contracted state to the extended state, the right lock pin 30 moves to the right and the left lock pin 31 moves to the left until the stopper hits. As a result, the display unit 50 fixed to the lock pins 30 and 31 also moves in the left-right direction. Instead of the above-described configuration, a mechanism similar to the right display unit driving mechanism 51 described above may be employed for the right lock pin 30 and the left lock pin 31 as a mechanism for driving the left and right display units 50.

  In the above, the display unit 50 is hidden by the cover unit 40 when the lock pins 30 and 31 are in the engaged position, and the display unit 50 is exposed from the cover unit 40 when the lock pins 30 and 31 are in the non-engaged position. In contrast to this, the display unit 50 is exposed from the cover unit 40 when the lock pins 30 and 31 are in the engaged position, and the display unit is displayed when the lock pins 30 and 31 are in the non-engaged position. 50 may be hidden behind the cover 40.

  Moreover, although the above demonstrated the case where the display part 50 was a plate-shaped member, the structure of the display part 50 is not restricted to this. For example, instead of fixing the plate-shaped display unit 50 to the connecting member 33, a part of the connecting member 33 may be painted in a color different from that of the other parts, and this painted part may be used as the display unit 50.

  Furthermore, although the quick coupler 100 according to the first embodiment and the quick coupler 200 according to the second embodiment have been described separately above, the configurations of the quick couplers 100 and 200 may be combined. That is, when the lock pins 30 and 31 are in the non-engagement position, the display unit 50 is exposed outside the quick coupler body 10 in the left-right direction, and the display unit 50 is exposed from the opening 45 of the cover unit 40. Good.

  According to the quick coupler of the present invention, it is possible to clearly display whether or not the lock pin is in the engaged position. Therefore, it is useful in the technical field of quick couplers for industrial vehicles.

DESCRIPTION OF SYMBOLS 10 Quick coupler main body 30 Right side lock pin 31 Left side lock pin 40 Cover part 45 Opening part 50 Display part 100,200 Quick coupler 101 Industrial vehicle 102 Link 110 Driver's seat 112 Work machine 120 Attachment

Claims (8)

A quick coupler for attaching attachments to industrial vehicle links,
Quick coupler body,
A lock pin that moves between an engagement position that engages with the attachment and a non-engagement position that does not engage with the attachment;
A cover part located on the back part of the quick coupler body;
In accordance with the movement of the lock pin, a display unit that moves between a first position hidden in the cover unit and a second position exposed from the cover unit,
When the lock pin is in the engaged position, the display unit is located in one of the first position and the second position, and when the lock pin is in the non-engaged position, the display unit is A quick coupler located in the other of the first position and the second position.   The quick coupler according to claim 1, wherein the display unit is in the first position when the lock pin is in the engaged position, and is in the second position when the lock pin is in the non-engaged position. .   The quick coupler according to claim 2, wherein the cover member covers the display unit from at least a top surface side and a back surface side when the display unit is in the first position.   The quick coupler according to claim 2, wherein the display portion is exposed outside the quick coupler main body when the lock pin is in the non-engagement position. The cover has an opening;
The quick coupler according to claim 2, wherein the display unit is exposed from the opening when the lock pin is in the non-engagement position.   When the lower end of the entire work machine including the attachment, the link, and the quick coupler is at a predetermined height position, the opening portion defines a gap between the members constituting the link from the driver's seat of the industrial vehicle. The quick coupler according to claim 5, wherein the quick coupler is disposed at a position where it can be visually observed.   The quick coupler according to claim 6, wherein the predetermined height position is a lowest ground height position of the industrial vehicle.   The industrial vehicle provided with the quick coupler as described in any one of Claims 1-7.

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