JP6439502B2 - Drawbar device for tow vehicle - Google Patents

Description

  The present invention relates to a drawbar device for a towing vehicle such as a towing tractor.

As a prior art of the drawbar device of a tow vehicle, for example, a vehicle tow coupler disclosed in Patent Document 1 can be cited.
The vehicle traction coupler disclosed in Patent Document 1 is a vehicle traction coupler in which a push-pull cable is operated by an operation lever and a traction pin is moved up and down via the cross lever. And the driven lever member are divided into two parts so that they can be bent halfway. According to the vehicle traction coupler, when the traction pin is lifted directly by hand, only the driven lever member is rotated, and the drive side lever member and the push-pull cable are not displaced at all. Trying to prevent buckling.

JP 2000-185533 A

  However, in the vehicle traction coupler disclosed in Patent Document 1, the cross lever is largely divided into two members (a drive side lever member and a driven side lever member), and when the traction pin is lifted, one member (driven) It is necessary to move only the side lever member). For this reason, the traction coupler for vehicles requires a configuration in which only two members are moved when the member for connecting the two members or the traction pin is lifted, in addition to the two members being dedicated parts. Thus, there is a problem that the number of parts increases.

  The present invention has been made in view of the above problems, and the object of the present invention is not to have a structure in which the link member is divided, and the cable is not pulled even if the drawbar pin is raised by operating the link member. It is to provide a drawbar device for a vehicle.

In order to solve the above problems, the present invention is provided with a drawbar bracket provided at the rear of a vehicle body, a drawbar pin that moves up and down with respect to the drawbar bracket, a link mechanism that raises and lowers the drawbar pin, and the vehicle body. An operation lever provided in a driver's seat and operating the link mechanism; a cable connecting the operation lever and the link mechanism; the link mechanism being connected to the draw bar pin; the cable; A drawbar device for a towing vehicle comprising: a shaft member that connects the link member; and a pivot shaft that rotatably supports the link member, wherein the link mechanism does not depend on the operation lever. The link member that keeps the position of the shaft member unchanged when the link member is rotated to raise the drawbar pin. Have a rotation allowing portion, the link member has a holding plate for holding said shaft member, said rotation allowing portion is provided on the holding plate, while inserting the shaft member, the shaft member A shaft member insertion hole that enables relative movement between the link member and the link member according to the rotation of the link member, and a rotation restricting member that restricts the link member to a preset rotation angle or less is provided. , the holding plate, characterized by have a controlled portion is restricted by the rotation restricting member.

  In the present invention, even if the link member is rotated so as to raise the drawbar pin by the operation of the link mechanism, the rotation permission portion of the link mechanism does not change the position of the shaft member that holds the cable and the link member. The rotation of the link member is allowed. For this reason, even if a draw mechanism pin is raised by operating a link mechanism, a cable does not buckle. Moreover, since it is not necessary to divide the link member in the middle, the link member does not have to be significantly changed from the members of the conventional link mechanism.

The link member by the operation of the link mechanism when rotated, the link member having a holding plate and the shaft member is inserted through the shaft member insertion hole of the holding plate is moved relative. Therefore, the position of the shaft member does not change when the link member rotates, and the cable does not buckle. Further, the holding plate can restrict excessive rotation of the link member.

Further, in the drawbar device of the tow vehicle described above, the pair of holding plates is provided with an interval in the axial direction of the shaft member, and both end portions of the shaft member are held by the pair of holding plates. Also good.
In this case, since the shaft member is held on both ends by the pair of holding plates, the posture of the shaft member with respect to the holding plate is always stable. Therefore, when the link member rotates, the shaft member and the link member can be relatively moved in a posture in which the shaft member is stabilized.

Further, in the drawbar device of the tow vehicle described above, the one holding plate is fixed to the link member, and a connecting member that connects the shaft member and the cable is provided, and the connecting member is fixed to the cable. And a pair of arm portions that extend from both ends of the cable fixing portion toward the shaft member and pivotally support the both end portions of the shaft member, and from the cable fixing portion of the arm portion to the shaft member. The length up to may be set to a length that allows the holding plate to pass between the arm portions.
In this case, since one holding plate can be used, the number of parts can be reduced. In addition, the holding plate can pass between the arm portions of the connection member, and the holding plate can function as the restricted portion.

Further, the present invention is provided in a draw bar bracket provided at a rear portion of a vehicle body, a draw bar pin that moves up and down with respect to the draw bar bracket, a link mechanism that lifts and lowers the draw bar pin, and a driver seat provided in the vehicle body, An operation lever for operating a link mechanism; and a cable for connecting the operation lever and the link mechanism. The link mechanism connects a link member connected to the draw bar pin, and the cable and the link member. A drawbar device for a tow vehicle comprising a shaft member and a pivot shaft that rotatably supports the link member, wherein the link mechanism raises the drawbar pin without relying on the operation lever. the link member has a rotation allowing portion of the link member to unchanged position of the shaft member when it is rotated, prior to The link member includes a boss portion into which the rotation shaft is inserted, and the boss portion is separated from the link side boss portion formed integrally with the link member and the link side boss portion, and holds the shaft member. A holding plate-side boss portion including a holding plate, and the rotation allowing portion may be provided between the link-side boss portion and the holding plate-side boss portion.
In this case, even if the drawbar pin is raised and the link member is rotated, the link member is allowed to rotate without changing the position of the shaft member due to the relative movement of the holding plate side boss portion and the link side boss portion. can do.

  ADVANTAGE OF THE INVENTION According to this invention, it is not set as the structure which divides | segments a link member, Even if it raises a draw bar pin by operation of a link member, the draw bar apparatus of the tow vehicle which a cable does not buckle can be provided.

It is a side view which shows the draw bar apparatus of the towing tractor which concerns on 1st Embodiment. It is a top view which shows the principal part of the draw bar apparatus of the towing tractor which concerns on 1st Embodiment. It is a side view which shows the principal part of the draw bar apparatus of a towing tractor. It is an enlarged front view which expands and shows the principal part of the draw bar apparatus of a towing tractor. It is an enlarged side view which expands and shows the principal part of the draw bar apparatus of a towing tractor. (A) is the enlarged front view which expands and shows the principal part of the draw bar apparatus of the towing tractor which concerns on 2nd Embodiment, (b) is a side view which expands and shows the principal part of the draw bar apparatus of a towing tractor. It is. (A) is an enlarged front view which expands and shows the principal part of the draw bar apparatus of the towing tractor which concerns on 3rd Embodiment, (b) is an AA arrow directional view in (a). (A) is an expanded front view which expands and shows the principal part of the draw bar apparatus of the towing tractor which concerns on the modification of 3rd Embodiment, (b) is a BB arrow directional view in (a). is there.

(First embodiment)
Hereinafter, a drawbar device for a tow vehicle according to a first embodiment will be described with reference to the drawings. In the present embodiment, a drawbar device (hereinafter referred to as “drawbar device”) of a towing tractor as a towing vehicle will be described.

  A vehicle body 11 of the towing tractor 10 shown in FIG. 1 includes a front wheel (not shown) and a rear wheel 12, and a driver seat 13 is provided in front of the rear wheel 12. The draw bar device 14 of the present embodiment is provided on the vehicle body 11. A frame member 15 that protrudes rearward is attached to the rear portion of the vehicle body 11.

  The draw bar device 14 includes a draw bar bracket 16 provided on the frame member 15, a draw bar pin 17, a link mechanism 18 that moves the draw bar pin 17 up and down, and a support member 19 that rotatably supports the link mechanism 18. Further, the drawbar device 14 includes an operation lever 20 provided in the driver's seat 13 and a cable 21 that connects the operation lever 20 and the link mechanism 18.

  As shown in FIG. 1, a swing shaft 22 is supported horizontally with respect to the vehicle body 11 on the base end side of the operation lever 20, and a base end portion of the operation lever 20 is fixed to the swing shaft 22. . A grip portion 23 is provided at the upper end of the operation lever 20, and the operation lever 20 is swingable about the swing shaft 22 by an operator's operation. A link lever 24 is fixed to the swing shaft 22, and the tip end portion of the link lever 24 and the end portion of the cable 21 on the driver's seat 13 side are connected via a clevis 25. The link lever 24 is displaced according to the swing of the operation lever 20, and the end of the cable 21 on the driver's seat 13 side is displaced by the displacement of the link lever 24 to operate the link mechanism 18. 2 and 3, the cable 21 has an inner cable 21A and an outer case 21B into which the inner cable 21A is inserted and protects the inner cable 21A. Both ends of the inner cable 21A are outer cases. It is exposed from 21B.

  As shown in FIG. 2, the frame member 15 is a member bent in a substantially U shape, and has a pair of left and right projecting portions 26 and a rear surface portion 27 connecting between the rear end portions of the projecting portions 26. A draw bar bracket 16 is fixed to the rear surface of the rear surface portion 27. The draw bar bracket 16 includes a substrate portion 28 fixed to the rear surface portion 27, an upper plate portion 29 formed on the substrate portion 28, and a lower plate portion 30 positioned below the upper plate portion 29. As shown in FIG. 3, the upper plate portion 29 has a triangular shape in plan view, is located above the lower plate portion 30, and has an insertion hole 31 through which the draw bar pin 17 is inserted. The lower plate portion 30 located below the upper plate portion 29 has an insertion hole 32 through which the draw bar pin 17 is inserted, similarly to the insertion hole 31.

  The drawbar pin 17 has a rod-shaped pin main body 33 and a head 34 connected to one end of the pin main body 33. The outer peripheral diameter of the pin main body 33 is slightly smaller than the insertion holes 31 and 32 of the draw bar bracket 16. The other end of the pin main body 33 is the lower end of the draw bar pin 17 and is formed with a tapered surface 35 whose outer diameter decreases toward the tip. The tapered surface 35 facilitates the insertion of the draw bar pin 17 into the insertion holes 31 and 32 of the draw bar bracket 16. The head portion 34 is the upper end portion of the draw bar pin 17 and has a size larger than the outer peripheral diameter of the pin main body portion 33, and has a pin hole 36 as shown in FIG. The head 34 and the link mechanism 18 are connected, and the draw bar pin 17 is raised and lowered with respect to the draw bar bracket 16 by the operation of the link mechanism 18.

  As shown in FIGS. 2 and 3, a horizontal member 37 is provided between the protruding portions 26 of the frame member 15 in the width direction. The horizontal member 37 is a plate-like member, and includes a horizontal portion 38 having a horizontal surface and an inclined portion 39 that is inclined forward and downward from the front edge of the horizontal portion 38. The horizontal portion 38 is provided with a support member 19 that rotatably supports the link mechanism 18. A cable bracket 40 that supports the outer case 21 </ b> B of the cable 21 is fixed to the inclined portion 39.

  The support member 19 has a pair of left and right plate portions 41 erected from the horizontal member 37, and shaft holes 42 are formed in the upper portions of the pair of plate portions 41. A rotation shaft 43 that rotatably supports the link mechanism 18 is inserted into the shaft hole 42. The rotation shaft 43 of this embodiment is fixed to the support member 19. The link mechanism 18 is rotatable with respect to the rotation shaft 43 and can be rotated with the rotation shaft 43 as a fulcrum. The link mechanism 18 includes a first link member 44 that is rotatably connected to the rotation shaft 43, and a pair of second link members 45 that are connected to the first link member 44 and connected to the draw bar pin 17. .

  The first link member 44 is a plate-like member and corresponds to a link member. A boss portion 46 having an insertion hole 47 through which the rotation shaft 43 is inserted is formed at the front end portion of the first link member 44. A pin hole 48 through which a connection pin 49 for connection to the second link member 45 is inserted is formed at the rear end portion of the first link member 44. The pin hole 48 is a long hole that allows the connecting pin 49 to move. A grip 50 is provided at the upper edge of the first link member 44. The grip part 50 is a member for rotating the link mechanism 18 without using the operation lever 20. A stopper surface 51 is formed at the lower edge of the first link member 44 so that the end of the first link member 44 on the pin hole 48 side is not displaced downward. When the stopper surface 51 comes into contact with the substrate portion 28 of the draw bar bracket 16, excessive rotation of the first link member 44 is restricted.

  The second link member 45 is a plate-like member and corresponds to a link member. Pin holes 52 are formed at both ends of the second link member 45, one pin hole 52 is inserted with a connecting pin 49 for connecting to the first link member 44, and the other pin hole 52 is a draw bar. A connecting pin 53 for connecting to the pin 17 is inserted. In the draw bar device 14 according to the present embodiment, the draw bar pin 17 is moved up and down by operating the first link member 44 by using a structure using two link members, the first link member 44 and the second link member 45. doing.

Next, the connection between the cable 21 and the link mechanism 18 will be described.
As shown in FIG. 4, the end 21 </ b> C on the rear side of the cable 21 is connected to a substantially U-shaped clevis 56 by a fixing member 55 as a cable fixing portion. The clevis 56 as a connecting member has a pair of arm portions, and a connecting pin 57 as a shaft member is pivotally supported at the tip of the arm portion. The connecting pin 57 pivotally supported by the clevis 56 is a pin for connecting and connecting the cable 21 and the link mechanism 18. A pair of left and right holding plates 58 are integrally formed with the boss portion 46 of the first link member 44. That is, the holding plate 58 is provided at an interval in the axial direction of the connecting pin 57. As shown in FIG. 5, the holding plate 58 is a member that extends in a substantially fan shape from the boss portion 46 to the outside in the radial direction, and the holding plate 58 has a substantially arc-shaped arc-shaped elongated hole as a shaft member insertion hole. 59 is formed.

  The arc-shaped long hole 59 is inserted through the connecting pin 57 connected to the clevis 56. Therefore, both ends of the connecting pin 57 are held by the pair of holding plates 58. The arc-shaped long hole 59 is formed based on an arc whose axis is the rotation shaft 43. Specifically, the holding plate 58 has semicircular arc surfaces 60 and 61 that form the front and rear portions of the arc-shaped long hole 59. The semicircular arc surfaces 60 and 61 have a diameter slightly larger than the outer peripheral diameter of the connecting pin 57. The holding plate 58 has two arc surfaces that form an intermediate portion that connects the front portion and the rear portion of the arc-shaped long hole 59. One of the two arc surfaces is an inner arc surface 62 that is close to the boss portion 46, and the other arc surface is an outer arc surface 63 that is farther from the boss portion 46 than the inner arc surface 62. The inner arc surface 62 has a diameter larger than the outer peripheral diameter of the boss portion 46, and the difference in radius between the outer arc surface 63 and the inner arc surface 62 corresponds to the diameter of the semi-arc surfaces 60 and 61.

  The dimension in the radial direction of the arc-shaped long hole 59 is set slightly larger than the outer peripheral diameter of the connecting pin 57. The circumferential dimension of the arc-shaped elongated hole 59 is such that even when the first link member 44 is rotated by the operation of the first link member 44, an external force that displaces the connecting pin 57 does not act, and the position of the connecting pin 57 is The dimensions are set to be invariant. Accordingly, when the holding plate 58 and the connecting pin 57 move relative to each other, the axial center of the connecting pin 57 draws an arc locus in the arc-shaped elongated hole 59. The arc-shaped elongated hole 59 corresponds to a rotation permission portion of the first link member 44 that does not change the position of connection of the connection pin 57. The arc-shaped long hole 59 sets a rotation allowable range S that allows relative movement between the holding plate 58 and the connecting pin 57 by rotation. By setting the rotation allowable range S, the rotation angle of the relative movement between the holding plate 58 and the connecting pin 57 is defined.

  In the present embodiment, a stopper plate 64 is attached between the plate portions 41 of the support member 19. The stopper plate 64 is a member for restricting excessive rotation of the first link member 44. On the other hand, the front end portion 65 of the holding plate 58 abuts against the stopper plate 64 and restricts excessive rotation of the first link member 44. The stopper plate 64 corresponds to a rotation restricting member that restricts the first link member 44 to a preset rotation angle or less, and the front end portion 65 of the holding plate 58 is a restricted portion restricted by the rotation restricting portion. Equivalent to. The stopper plate 64 can be provided with a shim 68 on the restricting surface of the stopper plate 64 by a bolt 66 and a nut 67. The shim 68 is a member for finely adjusting the rotation angle of the first link member 44. For example, when the number of shims 68 is increased, the rotation angle of the first link member 44 becomes smaller than when the shims 68 are not provided.

Next, the operation of the draw bar device 14 of this embodiment will be described. The draw bar device 14 according to the present embodiment can move the draw bar pin 17 up and down by operating the operation lever 20, and can rotate the first link member 44 to raise and lower the draw bar pin 17 without using the operation lever 20. It is also possible. In a state where the draw bar device 14 is not operated, the draw bar pin 17 is in a state of being inserted into the insertion hole 32 of the lower plate portion 30 in the draw bar bracket 16. In the state where the drawbar pin 17 is lowered, for example, the connection between the towing tractor 10 and the cart to be pulled is maintained. In addition, when the draw bar pin 17 is lowered, the operation lever 20 is located rearward and the cable 21 is not pulled. The connecting pin 57 of the clevis 56 is located in the front part of the arc-shaped long hole 59 of the holding plate 58. In FIG. 3, the state where the drawbar pin 17 is lowered is indicated by a solid line. Further, in FIG. 5, the holding plate 58 in a state where the draw bar pin 17 is lowered is indicated by a solid line.

  First, a case where the first link member 44 is rotated without using the operation lever 20 will be described. In this case, the operator first grips the grip 50 and pulls up the grip 50. By pulling up the grip portion 50, the first link member 44 is rotated about the rotation shaft 43 so that the end of the first link member 44 on the pin hole 48 side rises. The 1st link member 44 will raise the 2nd link member 45, and the 2nd link member 45 raises the draw bar pin 17 with a raise. As the draw bar pin 17 rises, the draw bar pin 17 is pulled out from the insertion hole 32 of the lower plate portion 30 in the draw bar bracket 16, and the lower end of the draw bar pin 17 is positioned in the insertion hole 31 of the upper plate portion 29. When the front end portion 65 of the holding plate 58 abuts against the shim 68 of the stopper plate 64, the rotation of the first link member 44 is restricted to a preset rotation angle or less. Since the first link member 44 is not excessively rotated by the contact between the holding plate 58 and the shim 68, the draw bar pin 17 does not come out of the insertion hole 31 of the upper plate portion 29 in the draw bar bracket 16. In FIG. 3, the state where the drawbar pin 17 is raised is indicated by a virtual line.

When the first link member 44 is pivoted about the pivot shaft 43 so that the end of the first link member 44 on the pin hole 48 side rises, the holding plate 58 is in the same direction as the first link member 44. Is rotated. In the rotation of the first link member 44 that raises the draw bar pin 17, the holding plate 58 is rotated from the rear to the front, but moves relative to the connecting pin 57 that connects the cable 21 and the holding plate 58. When the holding plate 58 rotates, the position of the connecting pin 57 in the arc-shaped elongated hole 59 moves relatively from the front portion to the rear portion of the arc-shaped elongated hole 59, but the absolute position of the connecting pin 57 remains unchanged. . Therefore, when the first link member 44 that raises the draw bar pin 17 is rotated, an external force that rotates the connecting pin 57 in the rotating direction is not input, and the connecting pin 57 and the clevis 56 are used. A force for buckling the cable 21 does not occur. Further, since the connecting pin 57 is held by both the pair of holding plates 58, the posture of the connecting pin 57 with respect to the holding plate 58 is always stable. In FIG. 5, the position of the holding plate 58 in a state where the draw bar pin 17 is raised is indicated by a virtual line.

  In a state where the draw bar pin 17 is pulled out from the insertion hole 32 of the lower plate portion 30 in the draw bar bracket 16, the connection between the towing tractor 10 and the cart to be pulled is released, or the operator prepares the connection with the cart. Is possible.

In order to operate the link mechanism 18 and return the draw bar pin 17 to the original position, the grip part 50 may be pushed down or the grip of the grip part 50 may be released. For example, when releasing the grip portion 50 , the first link member 44 is rotated by the rotation shaft 43 so that the end of the first link member 44 on the pin hole 48 side is lowered by the weight of the link mechanism 18 and the draw bar pin 17. Is turned around the fulcrum. The first link member 44 lowers the second link member 45, and the second link member 45 lowers the draw bar pin 17 as it descends. As the draw bar pin 17 is lowered, the draw bar pin 17 is inserted into the insertion hole 32 of the lower plate portion 30 in the draw bar bracket 16, and the lower end of the draw bar pin 17 is positioned below the lower plate portion 30. When the stopper surface 51 of the first link member 44 abuts against the substrate portion 28 in the draw bar bracket 16, the rotation of the first link member 44 is restricted at a predetermined rotation angle.

  When the first link member 44 is pivoted about the pivot shaft 43 so that the end of the first link member 44 on the pin hole 48 side is lowered, the holding plate 58 is in the same direction as the first link member 44. Is rotated. In the rotation of the first link member 44 that lowers the draw bar pin 17, the holding plate 58 is rotated from the front to the rear, but moves relative to the connecting pin 57 that connects the cable 21 and the holding plate 58. . When the holding plate 58 rotates, the position of the connecting pin 57 in the arc-shaped elongated hole 59 moves relatively from the rear part to the front part of the arc-shaped elongated hole 59, but the absolute position of the connecting pin 57 remains unchanged. . That is, when the first link member 44 for lowering the draw bar pin 17 is rotated, an external force for rotating the connecting pin 57 in the rotating direction is not input, and the connecting pin 57 and the clevis 56 are used. A force for buckling the cable 21 does not occur.

In the draw bar device 14 of the present embodiment, the draw bar pin 17 can be raised and lowered by operating the operation lever 20 in the driver's seat 13.
When the drawbar device 14 is operated by the operation lever 20, the operator tilts the operation lever 20 that is tilted backward. When the operation lever 20 is tilted forward, the link lever 24 pulls the cable 21 toward the driver's seat 13. The cable 21 tries to displace the connecting pin 57 of the clevis 56 downward. The connecting pin 57 to be displaced applies a force in a direction of rotating forward with respect to the holding plate 58 in a state where the connecting pin 57 is positioned at the front portion of the arc-shaped elongated hole 59. Accordingly, the first link member 44 to which the holding plate 58 is fixed rotates so as to raise the draw bar pin 17.

When the drawbar pin 17 is lowered by the operation of the operation lever 20, the operation lever 20 that is tilted forward may be returned to the original position. When the operation lever 20 is returned to the original position, the force from the connecting pin 57 to the holding plate 58 is released, and the first link member 44 is moved by the weight of the link mechanism 18 and the draw bar pin 17. The end on the pin hole 48 side is rotated in the descending direction. As a result, the draw bar pin 17 is lowered.

The draw bar device 14 of the present embodiment has the following operational effects.
(1) Even if the first link member 44 is rotated so as to raise the draw bar pin 17 by the operation of the link mechanism 18, the arc-shaped elongated hole 59 which is a rotation permission portion of the link mechanism 18 is not connected to the cable 21. The first link member 44 is allowed to rotate without changing the position of the connecting pin 57 that connects and connects the one link member 44. For this reason, even if the link mechanism 18 is operated and the draw bar pin 17 is raised, the cable 21 does not buckle. Moreover, since it is not necessary to divide the 1st link member 44 in the middle, it is not necessary to change the 1st link member 44 significantly from the member of the conventional link mechanism.

(2) When the first link member 44 is rotated by the operation of the link mechanism 18, the connection pin 57 inserted through the arc-shaped elongated hole 59 of the holding plate 58 and the first link member 44 including the holding plate 58; Moves relative to each other. Therefore, the position of the connecting pin 57 does not change when the first link member 44 rotates, and the cable 21 does not buckle. Further, since the holding plate 58 contacts the stopper plate 64 (or shim 68), excessive rotation of the first link member 44 can be restricted.

(3) Since the connecting pin 57 is held “both supported” by the pair of holding plates 58, the posture of the connecting pin 57 with respect to the holding plate 58 is always stable. Therefore, when the first link member 44 rotates, the connection pin 57 and the first link member 44 can be relatively moved in a posture in which the connection pin 57 is stabilized.

(4) The rotation angle at which the first link member 44 is rotatable is such that the stopper surface 51 of the first link member 44 and the substrate portion 28 of the draw bar bracket 16 are in contact with each other and the front end portion 65 of the first link member 44. And the contact between the stopper plate 64 and the stopper plate 64. Further, since the connecting pin 57 is inserted into the arc-shaped elongated hole 59 of the holding plate 58, the rotation angle of the first link member 44 is held by the holding plate 58 even if the stopper plate 64 and the stopper surface 51 are not formed. It is also possible to regulate this.

(5) Excessive rotation of the first link member 44 that raises the draw bar pin 17 is restricted by the contact between the front end portion 65 of the first link member 44 and the stopper plate 64. The position where the front end portion 65 of the first link member 44 abuts against the stopper plate 64 can be finely adjusted by using the shim 68.

(Second Embodiment)
Next, a draw bar apparatus according to the second embodiment will be described. The draw bar device of this embodiment is different from the draw bar device of the first embodiment in that the holding plate is one and the shape of the clevis provided with the connecting pin is changed. In the present embodiment, the description of the first embodiment is used for the configuration common to the first embodiment, and the reference numerals are used in common.

  As shown in FIGS. 6A and 6B, one holding plate 58 is integrally formed on the boss portion 46 of the first link member 71 in the draw bar device 70. The configuration of the holding plate 58 of the present embodiment is the same as the holding plate 58 of the first embodiment except that the plate thickness is set larger than that of the holding plate 58 of the first embodiment. For the sake of convenience, the same reference numerals are used. The holding plate 58 is located at the center of the boss portion 46 in the axial direction of the rotation shaft 43.

  On the other hand, the end 21 </ b> C on the rear side of the cable 21 is connected to a substantially U-shaped clevis 72 by a fixing member 55. The clevis 72 as a connecting member includes a pair of arm portions 72A facing each other. A connecting pin 73 for connecting and connecting the holding plate 58 and the cable 21 is provided near the tip of the arm portion 72A. The connecting pin 73 is inserted through the arc-shaped elongated hole 59 of the holding plate 58, and a pair of arm portions 72 </ b> A pivotally support both ends of the connecting pin 73. The cable 21 is connected to the clevis 72 via a fixing member 55. The dimensions of the clevis 72 are set so that the holding plate 58 can pass between the arms 72A. Specifically, the length of the arm portion 72A from the fixing member 55 to the connecting pin 73 is set to a length that allows the holding plate 58 to pass between the arm portions 72A. Accordingly, the length in the longitudinal direction of the arm portion 72A is set sufficiently larger than the length of the arm portion of the clevis 56 of the first embodiment.

  In the present embodiment, the holding plate 58 is located at the center of the boss portion 46 in the axial direction of the rotation shaft 43. Therefore, when the first link member 71 is rotated so that the draw bar pin 17 is raised, the front end portion 65 of the holding plate 58 contacts the bolt 66 provided on the stopper plate 64 and the first link member 71 is excessively rotated. Movement is regulated. Therefore, in this embodiment, the bolt 66 corresponds to a rotation restricting member.

  The draw bar device 70 of the present embodiment has the same effects as the effects (1) and (2) of the first embodiment. Moreover, according to this embodiment, the cable 21 and the 1st link member 71 can be connected and connected by the one holding | maintenance board 58 and the connection pin 73, and a number of parts can be reduced. Further, the rotation of the first link member 71 can be restricted by the bolt 66 without using the shim 68.

(Third embodiment)
Next, a draw bar device according to a third embodiment will be described. In the draw bar device of the present embodiment, the boss portion is divided into a link side boss portion integrally formed with the link member, and a holding plate side boss portion provided with a holding plate for holding the shaft member. This is different from the draw bar device of the first embodiment. In the present embodiment, the description of the first embodiment is used for the configuration common to the first embodiment, and the reference numerals are used in common.

  The rotation shaft 81 in the draw bar device 80 of the present embodiment shown in FIGS. 7A and 7B is rotatable with respect to the support member 19. The boss portion 83 of the first link member 82 is divided into two in the axial direction of the rotation shaft 81. One is a link side boss portion 84 formed integrally with the first link member 82, and the other is a holding plate side boss portion 85 adjacent to the link side boss portion 84.

  The link-side boss portion 84 includes an insertion hole 86 through which the rotation shaft 81 is inserted, and is rotatable with respect to the rotation shaft 81. The link-side boss portion 84 is formed with a notch 87 so that a part of the rotation shaft 81 is exposed. The notch portion 87 extends in the radial direction at the link-side boss portion 84 and extends in the axial direction of the rotary shaft 81 from both the circumferential wall surface 84A and the circumferential surface of the wall surface 84A. It is defined by a pair of existing wall surfaces 84B and 84C. As shown in FIG. 7B, the wall surface 84B is a front wall surface, and the wall surface 84C is a rear wall surface.

  The holding plate side boss portion 85 is provided with an insertion hole 88 into which the rotation shaft 81 is inserted, and the holding plate side boss portion 85 is fixed to the rotation shaft 81. The holding plate side boss portion 85 has a holding plate 89 provided with a circular pin hole 90. A connecting pin 91 as a shaft member provided in the clevis 56 is inserted into the pin hole 90 of the holding plate 89. In the present embodiment, the rotation shaft 81 is provided with a shaft 92 erected in the radial direction from the outer periphery of the rotation shaft 81. The shaft 92 is located in the notch 87. The shaft 92 functions as a member for transmitting a force to rotate the link-side boss portion 84 when the first link member 82 is rotated by the operation lever 20. The notch portion 87 formed in the link-side boss portion 84 corresponds to a rotation allowing portion of the first link member 82 that does not change the position of connection between the connection pin 91 and the holding plate 89. The rotation allowable portion sets a rotation allowable range S that allows relative movement between the link-side boss portion 84 and the holding plate-side boss portion 85 by rotation. By setting the allowable rotation range S, the rotation angle of the relative movement between the holding plate side boss portion 85 and the link side boss portion 84 is defined. Although not shown, a stopper plate 64 that contacts the holding plate 89 is provided.

  In the present embodiment, when the first link member 82 is operated to move the draw bar pin 17 up and down without using the operation lever 20, the first link member 82 is rotated about the rotation shaft 81 and the draw bar pin 17 is operated. To raise. When the first link member 82 is rotated with the rotation shaft 81 as a fulcrum, the link-side boss 84 integrated with the first link member 82 is rotated with respect to the rotation shaft 81. In the rotation of the first link member 82 that raises the draw bar pin 17, the link side boss portion 84 is rotated from the rear to the front, but moves relative to the holding plate side boss portion 85.

  When the link-side boss portion 84 rotates, the position of the shaft 92 in the notch portion 87 relatively moves from the front portion to the rear portion of the notch portion 87, but the absolute position of the shaft 92 remains unchanged. The absolute position of the shaft 92 is unchanged, and the position of the connecting pin 91 on the holding plate 89 of the holding plate-side boss 85 is also unchanged. That is, during the rotation of the first link member 82 that raises the draw bar pin 17, no external force in the rotation direction is input to the holding plate side boss portion 85, and the cable 21 is connected via the connecting pin 91 and the clevis 56. There is no force to buckle.

  When operating the first link member 82, the first link member 82 may be rotated until the wall surface 85 </ b> C contacts the shaft 92 due to the rotation of the first link member 82. Until the wall surface 85 </ b> C comes into contact with the shaft 92, the link-side boss portion 84 can be moved relative to the holding plate-side boss portion 85. When the first link member 82 is rotated in the direction in which the draw bar pin 17 is raised using the operation lever 20, the holding plate 89 is displaced downward by pulling the cable 21, and the holding plate side boss portion 85. Rotate. The rotation shaft 81 rotates together with the holding plate side boss portion 85. The shaft 92 presses the wall surface 85 </ b> B of the link-side boss portion 84 as the rotation shaft 81 rotates. By pressing the wall surface 85B of the shaft 92, the link-side boss portion 84 rotates together with the holding plate-side boss portion 85, and the first link member 82 is rotated in the direction in which the draw bar pin 17 is raised.

  According to the present embodiment, the rotation allowing portion can be realized by the boss portion 83. For this reason, even when it is not possible to provide a rotation allowing portion between the holding plate and the connecting pin, the first pin member 82 is connected and connected to the cable 21 without changing the position of the connecting pin 91. The rotation of the one link member 82 can be allowed. For this reason, even if the link mechanism 18 is operated and the draw bar pin 17 is raised, the cable 21 does not buckle.

(Modification of the third embodiment)
Next, a drawbar apparatus 100 according to a modification of the third embodiment will be described. As shown in FIGS. 8A and 8B, the boss portion 101 is divided into two parts, one being the link-side boss portion 102 formed integrally with the first link member 82, and the other being the other. Is a holding plate side boss portion 103 adjacent to the link side boss portion 102.

The link side boss portion 102 is rotatable with respect to the rotation shaft 81. A projecting piece 104 that protrudes in the axial direction of the rotation shaft 81 toward the holding plate side boss portion 103 is provided on the end surface of the link side boss portion 102 facing the holding plate side boss portion 103.
On the other hand, a notch portion 105 is formed in the holding plate side boss portion 103 so that a part of the rotation shaft 81 is exposed. The notch 105 extends in the radial direction in the holding plate side boss 103 and is formed in a sector shape in the circumferential direction, and from the both ends in the circumferential direction of the wall surface 103A in the axial direction of the rotation shaft 81. It is defined by the extending wall surfaces 103B and 103C. As shown in FIG. 8, the wall surface 103B is a front wall surface, and the wall surface 103C is a rear wall surface.

  The protrusion 104 of the link-side boss 102 is located in the notch 105, and the protrusion 104 can move in the circumferential direction at the notch 105. The cutout portion 105 corresponds to a rotation permission portion of the first link member 82 that does not change the position of connection between the connection pin 91 and the holding plate 89. The rotation permission portion sets a rotation allowable range S that allows relative movement between the link-side boss portion 102 and the holding plate-side boss portion 103 due to rotation. By setting the allowable rotation range S, the rotation angle of the relative movement between the holding plate side boss portion 103 and the link side boss portion 102 is defined.

  According to this modification, in the rotation of the first link member 82 that raises the draw bar pin 17, the link-side boss portion 102 is rotated from the rear to the front. Moving. When the link-side boss portion 102 rotates, the position of the protruding piece 104 in the notch portion 105 moves from the rear portion to the front portion, but the position of the holding plate-side boss portion 103 remains unchanged, and the connecting pin in the holding plate 89 The position 91 is also unchanged.

  When the first link member 82 is operated, the first link member 82 may be rotated until the projecting piece 104 comes into contact with the wall surface 103 </ b> B by the rotation of the first link member 82. The link-side boss portion 102 can be moved relative to the holding plate-side boss portion 103 until the projecting piece 104 contacts the wall surface 103B. When the first link member 82 is rotated in the direction in which the drawbar pin 17 is raised using the operation lever 20, the holding plate 89 is displaced downward by pulling the cable 21, and the holding plate-side boss portion 103. Rotate. The rotation shaft 81 rotates together with the holding plate side boss portion 103. The wall surface 103 </ b> C presses the protruding piece 104 of the link side boss portion 102 as the rotation shaft 81 rotates. By the pressing of the protruding piece 104 on the wall surface 103C, the link side boss portion 102 rotates together with the holding plate side boss portion 103, and the first link member 82 is rotated in the direction in which the draw bar pin 17 is raised. According to this modification, the same operational effects as those of the third embodiment are obtained.

  The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the invention. For example, the following modifications may be made.

In the above embodiment, the towing tractor as the towing vehicle has been described as an example, but the towing vehicle is not limited to the towing tractor. The towing vehicle is not particularly limited as long as it is a vehicle capable of towing a carriage such as a small towing vehicle.
In the first embodiment, the pair of holding plates are “both ends” supporting both ends of the shaft member (connection pin). However, the support of the shaft member by the holding plate is not limited to this. For example, of the pair of holding plates in the first embodiment, one holding plate is removed to form one holding plate, and one end of the connection pin is supported as “cantilever” supported by one holding plate. Also good.
In the first and second embodiments described above, the example of the arc-shaped elongated hole is described as the shaft member insertion hole, but the shape of the shaft member insertion hole is not limited to the arc-shaped elongated hole. The shape of the shaft member insertion hole is not limited and is not limited as long as it functions as a rotation permitting portion and realizes rotation of the link mechanism by lever operation.

DESCRIPTION OF SYMBOLS 10 Towing tractor 11 Car body 13 Driver's seat 14,70,80,100 Draw bar apparatus 16 Draw bar bracket 17 Draw bar pin 18 Link mechanism 19 Support member 20 Operation lever 21 Cable 40 Cable bracket 43, 81 Rotary shaft 44, 82 1st link member 45 Second link member 46, 83, 101 Boss portion 57, 91 Connecting pin (as shaft member)
58, 89 Holding plate 59 Arc-shaped long hole (as shaft member insertion hole)
64 Stopper plate (as a rotation restricting member)
65 Front end (as regulated part)
68 Shim 70 Drawbar Device (Second Embodiment)
71 First link member 72A Arm portion 73 Connecting pins 84, 102 Link side boss portions 85, 103 Holding plate side boss portions 87, 105 Notch portion 92 Shaft 104 Projection piece S Allowable rotation range

Claims (4)

A drawbar bracket provided at the rear of the vehicle body,
A drawbar pin that moves up and down relative to the drawbar bracket;
A link mechanism for raising and lowering the draw bar pin;
An operation lever provided in a driver's seat provided on the vehicle body and operating the link mechanism;
A cable connecting the operating lever and the link mechanism;
The link mechanism is
A link member connected to the draw bar pin;
A shaft member connecting the cable and the link member;
A drawbar device for a towing vehicle comprising a pivot shaft that rotatably supports the link member,
The link mechanism, the link member have a rotation allowing portion of the link member to unchanged position of the shaft member when it is rotated to raise the drawbar pin regardless of the operating lever ,
The link member has a holding plate that holds the shaft member;
The rotation allowing portion is provided on the holding plate and allows the shaft member to pass therethrough and allows the shaft member and the link member to move relative to each other according to the rotation of the link member. And
A rotation restricting member for restricting the link member to a preset rotation angle or less is provided,
The holding plate, drawbar device of the towing vehicle, characterized in that have a controlled portion is restricted by the rotation restricting member. A pair of the holding plates are provided at an interval in the axial direction of the shaft member,
The drawbar device for a towing vehicle according to claim 1 , wherein both end portions of the shaft member are held by a pair of the holding plates . One holding plate is fixed to the link member;
A connecting member for connecting the shaft member and the cable is provided,
The connecting member is
A cable fixing portion for fixing the cable;
A pair of arms extending from both ends of the cable fixing portion toward the shaft member and pivotally supporting the both ends of the shaft member;
Length from the cable fixing portion of the arm portion to the shaft member, the towing vehicle according to claim 1, characterized in that the holding plate is set to a length that can pass through between the arms Drawbar device. A drawbar bracket provided at the rear of the vehicle body,
A drawbar pin that moves up and down relative to the drawbar bracket;
A link mechanism for raising and lowering the draw bar pin;
An operation lever provided in a driver's seat provided on the vehicle body and operating the link mechanism;
A cable connecting the operating lever and the link mechanism;
The link mechanism is
A link member connected to the draw bar pin;
A shaft member connecting the cable and the link member;
A drawbar device for a towing vehicle comprising a pivot shaft that rotatably supports the link member,
The link mechanism includes a rotation permission portion of the link member that does not change a position of the shaft member when the link member is rotated to raise the draw bar pin without depending on the operation lever. ,
The link member includes a boss portion into which the rotation shaft is inserted,
The boss portion includes a link side boss portion formed integrally with the link member, and a holding plate side boss portion provided with a holding plate that is separated from the link side boss portion and holds the shaft member,
The draw bar device for a towing vehicle, wherein the rotation allowing portion is provided between the link side boss portion and the holding plate side boss portion .

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