JP2011241035A - Device for housing jib of wheel crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jib housing device of a wheel crane simplifying a housing operation, reducing weight and air resistance, thereby improving fuel economy.SOLUTION: The jib housing device 50 houses a jib 20 at a prescribed position in an upright placement posture on a vehicle body 1 when not used, wherein the jib is mounted at the top end of a boom 13 when used. The jib housing device includes: a support part 51 provided at a prescribed position on the vehicle body and supporting the jib by mounting it in the upright placement posture; and a rotation prevention and lowering guide means 52 guiding the lowering of the jib while preventing the rotation of the jib when performing jib lowering and housing operation of lowering the jib on the support part while the jib is suspended from the top end of the boom by a hoisting device.

Description

  The present invention relates to a jib storage device for a wheel crane, and more particularly to a device for storing a relatively short jib attached to the tip of a boom when in use in a vertical position at the rear of a vehicle body when not in use.

  In general, in a wheel crane, apart from a boom whose base end is swingably supported on a vehicle body, a relatively long long jib is provided to supplement the length of the boom, A short jib with a relatively short length may be equipped to increase the maximum load.

  And among this kind of jib, as a jib storage device for storing a long jib when not in use, one that is fixed and stored in a state where the jib is superimposed on the outer side surface of the boom or the like is disclosed in Patent Document 1. As described above, there are known ones in which a support portion is provided on a vehicle body frame, and a jib is fixedly stored in the support portion in a state of being placed horizontally in the front-rear direction.

  In addition, as a jib storage device that stores a short jib when not in use, a box-shaped storage box that opens upward is installed at the rear of the vehicle body, and the jib removed from the boom tip when not in use is suspended from the boom tip The hoisting device is temporarily lifted by using the hook of the hoisting device, the upper revolving body is swung by approximately 180 degrees, and then the jib is suspended by the hoisting device and is then wound into the storage box and stored in the vertical position. Are known.

JP-A-9-1551078

  However, among the conventional jib storage devices described above, in the case of the latter short jib, when the jib is suspended from the tip of the boom by the hoisting device, the jib is hooked to the hoisting device. Since it rotates together with this, there is a problem that it is necessary to assist workers other than the crane operator in order to store the jib in the storage box in a predetermined state. In addition, the storage box is large because it is necessary to store more than the lower half of the jib, and there is a problem in that the weight increases, the air resistance increases when the crane travels, and the fuel consumption increases.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and the object of the present invention is to provide a crane with a simple configuration when storing a short jib in a vertical position at a predetermined position on a vehicle body when not in use as described above. A wheel crane jib storage device that can be easily stored by a single driver so that the storage work can be simplified and the weight and air resistance can be reduced, which in turn contributes to improved fuel economy. Is intended to provide.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a wheel crane jib storage device that stores a jib mounted on the tip of a boom when in use in a vertical position at a predetermined position on the vehicle body when not in use. A support portion provided at a predetermined position on the vehicle body for supporting the jib in a vertical position, and winding the jib on the support portion with the hoisting device suspended from the tip of the boom. It is provided with a rotation prevention and lowering guide means for guiding the lowering of the jib while guiding the lowering of the jib while lowering the lowering of the jib.

  In this configuration, the jib removed from the tip of the boom when the jib is not in use is unwound and stored at a predetermined position on the vehicle body after being temporarily lifted by the hoisting device. This prevents the jib from rotating while guiding the lowering of the jib, and the jib is securely placed and stored in a vertical position on the support provided at the predetermined position. The jib can be stored safely. In addition, when the jib is placed on the support portion, the jib rollover is restricted by the rotation preventing and lowering guide means, so that the jib storage posture can be stabilized, and the configuration of the support portion and the jib storage can be achieved. The configuration of the apparatus can be made simple and compact.

  According to a second aspect of the present invention, in the jib storage device for a wheel crane according to the first aspect, a specific form of the rotation preventing and lowering guide means is provided. That is, the rotation prevention and lowering guide means is provided on the jib side or the jib side so that it can be inserted into the elongate hole or the depression and provided in the elongate hole or the depression on the jib side or the car body side. And a convex portion formed. In this configuration, rotation is performed by a vertically extending elongated hole or concave portion provided on the jib or vehicle body side, and a convex portion provided on the vehicle body side or jib side so as to be insertable into the elongated hole or concave portion. In addition to the simple construction of the prevention and lowering guide means, the function of guiding the lowering and lowering of the jib is reliably exhibited while preventing the rotation of the jib.

  The invention according to claim 3 provides a preferable specific form of the jib in the jib storage device for a wheel crane according to claim 1 or 2. That is, the jib includes a support shaft that rotatably supports a plurality of sheaves, a pair of left and right foot members that are connected to both ends of the support shaft, and a connecting portion side of each foot member and the support shaft. A pair of left and right suspension rods whose one ends are rotatably connected, and a pair of left and right leg members whose one ends are rotatably connected via brackets to the intermediate portions of the respective foot members; When the jib is used, the other end of each foot member and the other end of each suspension rod are connected to a predetermined part of the boom tip so that the jib is attached to the boom tip, and the leg members are overlapped on the foot member side. When the jib is not used, the suspension rod and the leg member are overlapped on the foot member side and the sheave side is on the upper side. In this state, the jib is placed and stored on the support, and when the jib is removed from the tip of the boom and placed on the ground, the leg members protrude from the foot member so that the other end is grounded. The configuration is fixed with. In this configuration, of the three members that constitute the jib on both the left and right sides of the jib when the jib is not used, the suspension rod and the leg member are overlapped on the foot member side, and the jib is placed vertically with the sheave side facing up. Is placed and stored on the support portion, the jib storage space can be made as small as possible.

  According to a fourth aspect of the present invention, in the jib storage device for a wheel crane according to the third aspect, a recess formed at the other end of each foot member of the jib at the other end supports the sheave at the tip of the boom. The support portion is coupled by a pin in a state of being fitted to the end portion of the support shaft, and the support portion has a support rod having an outer diameter provided horizontally at a predetermined position on the vehicle body and substantially the same as that of the support shaft. The jib foot members are supported by being coupled by pins in a state where the recesses of the foot members of the jib are externally fitted to the support rod when not used. In this configuration, the recess formed in the other end of each foot member of the jib is fitted in the end of the sheave support shaft at the tip of the boom when the jib is used, and in the state of being fitted on the support rod of the support portion when the jib is not used. Since they are connected by the same pin, it is not necessary to store the pin.

  According to a fifth aspect of the present invention, in the wheel crane jib storage device according to the fourth aspect, the lower ends of the pair of left and right vertical members extending upward are fixed to both ends of the support rod, and the upper portions of the vertical members are fixed to the upper ends of the vertical members. A long hole extending in the vertical direction is provided, and this long hole is opposed to the pin hole provided in the bracket in the middle part of each foot member of the jib when the jib is wound and stored, and a pin is inserted into the pin hole and the long hole. Thus, the pin is configured so as to exhibit the function of the rotation preventing and lowering guide means together with the pin. In this configuration, a long hole provided in the upper part of a pair of left and right vertical members whose lower ends are fixed to both ends of the support rod on the vehicle body side, and a pin provided in a bracket in the middle part of each foot member of the long hole and the jib The anti-rotation and lowering guide means is simply configured by the pin inserted in the hole, and the function of the anti-rotation and lowering guide means, that is, the function of guiding the lowering of the jib while preventing the rotation of the jib is ensured. Demonstrated.

  According to a sixth aspect of the present invention, in the jib storage device for a wheel crane according to the fifth aspect, the lower part of each vertical member is in contact with the recess side end of each foot member of the jib when the jib is unwound. A structure is provided in which a guide plate is provided for guiding the recessed portion of the foot member to be fitted around the support rod of the support portion. In this configuration, when the jib is unwound and stored at a predetermined position on the vehicle body from the state where the jib is once lifted by the hoisting device, the rotation of the jib is prevented while the rotation prevention / winding guide means prevents rotation of the jib. Not only the bottom is guided, but also the support part provided at the predetermined position with the recess of each foot member in contact with the recess side end of each foot member of the jib to the guide plate provided at the lower part of each vertical member Since it is guided so as to be fitted around the rod, even when there is a gap between the long hole and the pin constituting the rotation prevention and lowering guide means, the jib is in a predetermined position and the recess of each foot member is in a predetermined position. It is possible to more reliably perform the storage in a vertically installed posture that fits around the support rod of the provided support portion.

  As described above, according to the jib storage device for a wheel crane according to the present invention, when the jib is unwound and stored at a predetermined position on the vehicle body from the state where the jib is once lifted by the hoisting device, the anti-rotation and winding is performed. The lower guide means guides the lowering of the jib while preventing the jib from rotating, and the jib is securely placed and stored in a vertical position on the support provided at the predetermined position. However, the jib can be stored easily and safely, and the storing operation can be made easier and more efficient. Moreover, when the jib is placed on the support portion, the rotation prevention and lowering guide means regulates the jib rollover, so that the jib storage posture can be stabilized and the structure of the support portion and the jib storage device can be stabilized. The configuration can be made simple and compact. As a result, there is also an effect that the weight and the air resistance during traveling of the crane can be reduced, and the fuel efficiency can be improved.

  In particular, the invention according to claim 2 is provided on the vehicle body side or the jib side so as to be able to be inserted into the long hole or the concave strip portion, which is provided on the jib side or the vehicle body side and extends in the vertical direction. It is possible to easily constitute the rotation prevention and lowering guide means with the convex portions, and to reliably demonstrate the function of guiding the lowering of the jib while preventing the rotation of the jib. It is effective in planning.

  In the invention according to claim 3, of the three members constituting the jib on the right and left sides of the jib when the jib is not used, the suspension rod and the leg member are overlapped on the foot member side and the sheave side is on the upper side. Since the jib is placed and stored on the support portion in the standing state, the storage space for the jib can be made as small as possible, and the jib storage device can be made smaller and lighter, thereby improving the fuel efficiency. it can.

  In the invention according to claim 4, the recesses formed at the other ends of the foot members of the jib are respectively connected to the end of the sheave support shaft at the tip of the boom when the jib is used, and to the support rod of the support portion when the jib is not used. Since they are connected by the same pin in the fitted state, storage of the pin becomes unnecessary, and an effect excellent in practicality is achieved.

  In the invention according to claim 5, a long hole provided in the upper part of a pair of left and right vertical members each having a lower end fixed to both ends of the support rod on the vehicle body side, and a bracket in the middle part of each foot member of the long hole and the jib The rotation prevention and lowering guide means can be easily configured by a pin inserted into the pin hole provided in the pinhole, and the function of guiding the lowering of the jib can be surely exhibited while preventing the rotation of the jib. Therefore, it is effective for implementation.

  Further, in the invention according to claim 6, not only the rotation of the jib is guided by the rotation preventing and lowering guide means while the jib is retracted but also the lowering of the jib is guided and provided at the lower part of each vertical member. Since the guide plate is guided so that the end of the recess of each foot member on the jib comes into contact with the support rod of the support portion provided at a predetermined position on the vehicle body, the above-mentioned rotation prevention Even when there is a gap between the long hole and the pin constituting the double winding guide means, the vertical position is such that the recess of each foot member is fitted to the support rod of the support portion provided at the predetermined position of the jib. Can be more reliably stored, and the storage operation can be facilitated and speeded up.

FIG. 1 is a side view of a wheel crane according to an embodiment of the present invention. FIG. 2 is an enlarged view of the rear part of the vehicle body of the wheel crane. FIG. 3 is an arrow view taken along line XX in FIG. 4 is an enlarged view of the vicinity of the jib storage device of FIG. FIG. 5 is an arrow view taken along line YY of FIG. FIG. 6 is an arrow view taken along the line ZZ in FIG. FIG. 7 shows a state before the jib storage device is attached, in which (a) is a front view, (b) is a left side view, and (c) is a right side view. FIG. 8 is an explanatory view showing a state when the jib attached to the tip of the boom is removed. FIG. 9 is an explanatory diagram for explaining the operation of storing the jib in the jib storage device. FIG. 10 is also an explanatory diagram. FIG. 11 is also an explanatory diagram. FIG. 12 is also an explanatory diagram. FIG. 13 is also an explanatory diagram. FIG. 14 is an enlarged view of the vicinity of the jib storage device of FIG. FIG. 15 is a view corresponding to FIG. 14 showing a state where the jib is slightly lowered from the state of FIG.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments that are modes for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows an overall configuration of a wheel crane equipped with a jib storage device according to an embodiment of the present invention, wherein 1 is a lower traveling body having a uniaxial front wheel 2 and biaxial rear wheels 3, 4. Outriggers 5 and 6 are respectively provided at the front end portion and the rear end portion of the lower traveling body 1, and an upper swing body 11 is provided on the lower traveling body 1 so as to be able to turn.

  The upper swing body 11 is provided with a cab 12 that constitutes a cab, and a base end of an extendable boom 13 is supported so as to be raised and lowered. An idler sheave 14 and a point sheave 15 are provided at the tip of the top boom 13a of the boom 13 as shown in an enlarged detail in FIG. 8, and the length is relatively long depending on the work contents. A short jib (not shown) or a short jib 20 having a relatively short length is mounted. The long jib is mainly used to supplement the length of the boom 13 and is stored in a state along the side surface of the base boom 13b of the boom 13 when not in use.

  The short jib 20 is for increasing the maximum load of a suspended load, and includes a support shaft 22 that rotatably supports a plurality (two in FIG. 5) of sheaves 21 and one end at each end of the support shaft 22. A pair of left and right foot rods 23 connected to each other, and a pair of left and right suspension rods 26 each of which is pivotally connected to a bracket 24 on the connecting portion side of each foot member 23 and the support shaft 22 by a pin 25. Each of the foot members 23 has a pair of left and right leg members 29, one end of which is pivotally connected to each other by a pin 28 via a bracket 27. When the short jib 20 is used, the other end of each foot member 23 and the other end of each suspension rod 26 are coupled to a predetermined portion at the tip of the top boom 13a of the boom 13, as shown in FIGS. As a result, the short jib 20 is attached to the tip of the top boom 13a of the boom 13, and the leg members 29 are fixed in a state of being superimposed on the foot member 23 side. At this time, the wire 30 of the hoisting device reaches the sheave 21 of the short jib 20 through the idler sheave 14 at the tip of the top boom 13 a of the boom 13, and reciprocates between the sheave 21 and the hanging hook 31. It is designed to be supported by three or four hooks. On the other hand, when the short jib 20 is not used, the suspension rod 26 and the leg member 29 are overlapped on the foot member 23 side and the sheave 21 side is on the upper side as shown in FIGS. The short jib 20 is stored in the rear end portion of the lower traveling body 1 through the jib storage device 50 in a vertically placed state. At this time, the wire 30 of the hoisting device reaches the hanging hook 31 through the idler sheave 14 and the point sheave 15 at the tip of the top boom 13a of the boom 13, as shown in FIGS. It is designed to be supported by hanging. Further, when the short jib 20 is removed from the tip of the top boom 13a of the boom 13 and placed on the ground or the like, each leg member 29 is, as shown in FIG. 8, a foot member 23 so that a roller 32 provided at the other end is grounded. It is fixed in a state of projecting at a substantially right angle.

  Each suspension rod 26 of the short jib 20 includes a hollow sheath material 26a and an inner material 26b inserted into the sheath material 26a. The sheath material 26a is provided with a long hole 33 extending in the longitudinal direction and penetrating in the lateral direction, while the inner material 26b has three through holes 34a, 34b, 34c corresponding to the long hole 33. The suspension rod 26 is provided at predetermined intervals in the longitudinal direction. By inserting a pin 35 into one of the three through holes 34 a to 34 c and the long hole 33, the suspension rod 26 can be used when the short jib 20 is used. The length dimension, and thus the offset angle of the short jib 20 is provided in three stages. When the short jib 20 is not used, the suspension rod 26 is minimized by inserting most of the inner member 26b into the sheath member 26a. At this time, although the pin 35 is inserted into any of the three through holes 34a to 34c, the relative position between the pin 35 and the long hole 33 changes to minimize the length of the suspension rod 26. In order to keep the length of 26 to a minimum, the pin 35 is inserted into the through hole 34 c and the long hole 33.

  In addition, a recess 36 is formed at the other end of each foot member 23 of the short jib 20 (that is, the end opposite to the connecting portion side to the support shaft 22), and when the short jib 20 is used, The other end of each foot member 23 is coupled by a coupling pin 38 in a state in which the concave portion 36 is externally fitted to an end portion of a support shaft 37 that supports the point sheave 15 at the tip of the top boom 13 a of the boom 13. A bracket 27 in the middle of each foot member 23 is L-shaped. A pin hole (not shown) for connecting one end of the leg member 29 with a pin 28 is formed in the middle of the bracket 27. A pin hole 39a for fixing the leg member 29 in a state of being superimposed on the foot member 23 side at one end portion, and the leg member 29 protruding from the foot member 23 at a substantially right angle at the other end portion of the bracket 27. Pin holes 39b (see FIG. 4) for fixing are respectively provided. One of the pin holes 39a and 39b is a pin hole 41 provided in the leg member 29 when the leg member 29 is overlapped on the foot member 23 side or is protruded at a substantially right angle from the foot member 23 (see FIG. 4). The leg member 29 is fixed by inserting a pin 42 together with the pin hole 41.

  On the other hand, as shown in FIGS. 2 to 7, the jib storage device 50 is provided at the rear end portion of the lower traveling body 1, and has a support portion 51 for placing and supporting the short jib 20 in a vertical position. The short jib 20 is hung on the support 51 while being hung from the tip of the boom 13 by the hoisting device. When the jib is unwound, the short jib 20 is prevented from rotating while being guided. And a rotation prevention and lowering guide means 52.

  The support portion 51 includes an attachment member 53 attached to the lateral frame 7 at the rearmost portion of the lower traveling body 1, and a support rod 54 made of a circular pipe provided horizontally above the attachment member 53 in the vehicle width direction. have. The outer diameter of the support bar 54 is set to be substantially the same as the outer diameter of the support shaft 37 that supports the point sheave 15 at the tip of the top boom 13a of the boom 13, and the jib storage device is used when the short jib 20 is not used. 50, when the recess 36 of each foot member 23 of the short jib 20 is externally fitted to the support rod 54 and is coupled by the coupling pin 38, the foot member 23 of the short jib 20 is supported in a fixed state. It has become.

  The rotation preventing and lowering guide means 52 has a pair of left and right vertical members 55, 55 extending upward from both ends of the support rod 54 of the support portion 51. Each of the vertical members 55 includes a lower inclined portion 55a that extends obliquely upward and forward from the lower end side fixed to the support rod 54 and the attachment member 53, and an upper vertical portion 55b that extends vertically upward from the lower inclined portion 55a. The pair of left and right vertical members 55 and 55 are connected to each other via horizontal connecting members 56 and 57 at two upper and lower positions (specifically, an upper end position of the upper vertical portion 55b and an upper end position of the lower inclined portion 55a). . The upper vertical portion 55b of each vertical member 55 is provided with a long hole 58 extending in the vertical direction. The long hole 58 is a bracket 27 at the middle portion of each foot member 23 of the short jib 20 when the jib is unwound. A long pin 59 is inserted between the left and right brackets 27 and 27 and between the vertical members 55 and 55 by inserting a long pin 59 into the pin hole 39b and the long hole 58 on the left and right sides, respectively. By spanning 59, the function of the rotation prevention and lowering guide means 52 is exhibited together with the long pin 59.

  On the outer side surface of the lower inclined portion 55c of each vertical member 55, the recess 36 of each foot member 23 comes into contact with the end of the foot member 23 of the short jib 20 when the jib is unwound. A guide plate 61 is provided so as to protrude laterally so as to be fitted to the support rod 54 of 51. Further, the upper vertical portion 55b of each vertical member 55 is provided with a substantially C-shaped belt passing portion 62 at two positions above and below the front edge, and the jib storage device 50 allows the short jib 20 to be placed in a vertical posture. When stored, the short jib 20 and the vertical member 55 of the jib storage device 50 are fastened by the two fastening belts 63 and 63 through the belt passing portions 62.

  Further, a base end portion of a pair of left and right mounting plates 64 and 64 extending rearward and upward from a position near the inner side of each vertical member 55 is fixed to the support bar 54 of the support portion 51. A pin hole 65 is provided at the tip. When the jib storage device 50 stores the short jib 20 in the vertical position, the pin hole 65 is connected to the end of the sheath material 26a of each suspension rod 26 of the short jib 20 with the tip of the top boom 13a of the boom 13. Each suspension rod 26 is fixed to the mounting plate 64 by inserting the pin 67 when the pin connection is removed into both the pin holes 65, 66 so as to face the pin hole 66 provided for the pin connection. It is like that.

  Next, in the wheel crane, the work procedure in the case where the short jib 20 attached to the tip of the boom 13 is stored in the vertical posture by the jib storage device 50 provided at the rear end of the lower traveling body 1 is shown in FIG. This will be described with reference to FIGS.

  After the work using the short jib 20 is completed, first, as shown in FIG. 9, the boom 13 is lowered slightly from the fully contracted state until the undulation angle becomes substantially zero, and the sheave of the short jib 20 The suspension hook 31 that hangs down from the wire 21 of the hoisting device 21 is grounded. In this state, the leg member 29 of the short jib 20 is rotated around the pin 28 from the position where the leg members 29 are overlapped on the foot member 23 side to the position where the leg member 23 protrudes substantially perpendicularly, and is fixed by the pin 42 at this position. To do. Moreover, while removing the hanging hook 31, equipments (all not shown), such as an overwinding prevention limit switch and a weight relevant to this hanging hook 31, are removed.

  Subsequently, as shown in FIG. 10, the boom 13 is lowered to ground the sheave 21 of the short jib 20 and the rollers 32 of the leg members 29. In this state, each foot member 23 and each suspension rod 26 of the short jib 20 is disconnected from the boom 13 tip, and the short jib 20 is separated from the boom 13 tip. At this time, as shown in detail in FIG. 8, each suspension rod 26 of the short jib 20 is reduced to the minimum length, and the pin 35 is inserted into the long hole 33 and the through hole 34c. Further, the boom 13 is reduced to the minimum reduction state.

  Next, as shown in FIG. 11, after the wire 30 of the hoisting device is wound between the point sheave 15 at the tip of the boom 13 and the suspension hook 31 and the suspension hook 31 is attached, the boom 13 is placed in a substantially horizontal state (undulations). Raise the angle to approximately zero). In this state, equipment such as an overwinding prevention limit switch and a weight related to the hanging hook 31 are attached.

  Subsequently, as shown in FIG. 12, the end of each foot member 23 of the short jib 20 is lifted by the suspension hook 31 and the suspension belt 68 suspended from the tip of the boom 13, and each leg member of the short jib 20 is lifted. 29 rollers 32 are slightly separated from the ground. In this state, each leg member 29 of the short jib 20 is rotated to a position where it is superimposed on the foot member 23 side, and is fixed by a pin 42 at this position. Then, the hanging hook 31 is lowered and the short jib 20 is once laid down sideways, and the lifting position of the hanging hook 31 (specifically, the position where the hanging belt 68 is latched) is changed to the sheave 21 side of the short jib 20. The short jib 20 is lifted with the sheave side 21 facing upward.

  Next, as shown in FIG. 13, the upper revolving unit 11 is revolved by about 180 degrees, and the short jib 20 lifted by the suspension hook 31 of the hoisting device is provided at the rear end of the lower traveling unit 1. Move upward.

  Thereafter, the hoisting device shortens the pin holes 39b of the brackets 27 at the intermediate portions of the foot members 23 of the short jib 20 to positions where the pin holes 39b face the upper portions of the long holes 58 of the vertical members 55 of the jib storage device 50, respectively. Lower the jib 20 slowly. At that time, since the short jib 20 freely rotates around the vertical line together with the hanging hook 31, the bracket 27 at the middle portion of each foot member 23 of the short jib 20 is attached to the upper vertical portion 55 b of each vertical member 55 of the jib storage device 50. Roughly align with the top edge as appropriate.

  Next, as shown in FIG. 14, the pin hole 39b and the upper portion of the long hole 58 of the vertical member 50 of the jib storage device 50 are opposed to each other on the left and right sides of the short jib 20, and the long holes 39b and 58 are long. The long pin 59 is bridged between the left and right brackets 27 and 27 of the short jib 20 and the left and right vertical members 55 and 55 of the jib storage device 50 by inserting the long pin 59. At that time, since the short jib 20 is suspended by the suspension hook 31, the pin hole 39b and the long hole 58 can be easily aligned with a light force.

  Next, the short jib 20 is slowly lowered by the hoisting device. At this time, since the long pin 59 and the long hole 58 of each vertical member 55 of the jib storage device 50 are engaged with each other, the short jib 20 is not rotated and is inserted into the long hole 58 of the vertical member 55. Descent along.

  Further, when the short jib 20 is rolled down, as shown in FIG. 15, the end portions of the foot member 23 on the side of the recess 36 come into contact with the guide plate 61 on the side surface of the vertical member 55 of the jib storage device 50 as shown in FIG. Thus, the concave portion 36 of the foot member 23 is guided so as to be fitted onto the support rod 54 of the support portion 51 of the jib storage device 50. For this reason, even when there is a backlash due to a gap between the long pin 59 and the long hole 58 of the vertical member 55, the short jib 20 has the recess 36 of each foot member 23 as a support portion of the jib storage device 50. Thus, the short jib 20 can be easily and surely and quickly accommodated in a predetermined position where it is fitted on the support rod 54 of 51.

  Thereafter, as shown in FIGS. 4 to 6, the end of each foot member 23 of the short jib 20 on the side of the recess 36 is coupled to the support bar 54 of the support 51 of the jib storage device 50 by the coupling pin 38. Further, one end on the free side of each suspension rod 26 of the short jib 20 is coupled to a mounting plate 64 of the jib storage device 50 by a pin 67. Further, the short jib 20 and each vertical member 55 of the jib storage device 50 are fastened by the two fastening belts 63 and 63, so that there is no play between the short jib 20 and each vertical member 55 of the jib storage device 50. Prevents the occurrence of vibration and noise during running by eliminating the sticking. Finally, the suspension belt 68 is removed from the short jib 20.

  In the case of the above operation procedure, in particular, when the short jib 20 is suspended from the tip of the boom 13 by the hoisting device and is stored on the support 51 of the jib storage device 50, the long pin 59 is used. By engaging the long holes 58 of the vertical members 55 of the jib storage device 50, the short jib 20 is guided to be rolled down along the long holes 58 while preventing the short jib 20 from rotating or rotating. However, the crane jib storage device 50 can be placed and stored on the support portion 51 of the jib storage device 50 in a vertical orientation, so that even a crane operator can easily and safely carry out the lower jib 20 unwinding and storage operation. That is, the crane operator uses the hoisting device so that the pin holes 39b of the brackets 27 at the intermediate portions of the foot members 23 of the short jib 20 face the upper portions of the long holes 58 of the vertical members 55 of the jib storage device 50. When the short jib 20 is slowly rolled down to the inside of the cab 12, the pin hole 39b and the long hole 58 of the vertical member 50 of the jib storage device 50 are provided on the lower traveling body 1 on the left and right sides of the short jib 20, respectively. The long pins 59 are inserted into the holes 39b and 58 so as to be opposed to the left and right brackets 27 and 27 of the short jib 20 and between the left and right vertical members 55 and 55 of the jib storage device 50. Thus, by carrying out the work of bridging the long pin 59 by itself, the work of retracting and retracting the short jib 20 can be easily and safely performed.

  Moreover, when the short jib 20 is placed on the support portion 51 of the jib storage device 50, the short jib 20 rolls over due to the engagement between the long pin 59 and the long hole 58 of each vertical member 55 of the jib storage device 50. Therefore, the storage posture of the short jib 20 can be stabilized, and the configuration of the support portion 51 and the configuration of the jib storage device 50 can be made simple and compact. It is possible to reduce air resistance and improve fuel efficiency.

  In particular, in the case of the present embodiment, the suspension rod 26 and the leg member 29 are overlapped on the foot member 23 side among the three members constituting the short jib 20 on the left and right sides of the short jib 20 when the short jib 20 is not used. Since the short jib 20 is placed and stored on the support portion 51 in a vertically placed state with the sheave 21 side up, the storage space for the short jib 20 can be made as small as possible, and the jib storage The device 50 can be reduced in size and weight, and the fuel consumption can be further improved.

  Further, the recess 36 formed at the end of each foot member 23 of the short jib 20 is stored at the end of the point sheave support shaft 37 at the tip of the boom 13 when the short jib 20 is used, and when the short jib 20 is not used. Since they are coupled by the same coupling pin 38 while being fitted on the support rods 54 of the support portion 51 of the apparatus 50, it is not necessary to store the coupling pin 38, and an effect of excellent practicality is achieved.

  In addition, this invention is not limited to the said embodiment, A various other form is included. For example, in the above embodiment, the upper vertical portion 55b of each vertical member 55 of the jib storage device 50 is provided with a long hole 58 extending in the vertical direction, and the pin hole 39b is provided in the bracket 27 at the middle portion of each foot member 23 of the short jib 20. The long pin 59 is inserted between the left and right brackets 27 and 27 and between the vertical members 55 and 55 by inserting the long pin 59 into the pin hole 39b and the long hole 58 on the left and right sides of the short jib 20, respectively. However, the present invention is not limited to this. For example, the pin hole 39b and the long hole 59 are separately provided on the left and right sides of the short jib 20, respectively. It is configured so that the function of the rotation preventing and lowering guide means 52 is exhibited by inserting a normal pin, or a pin hole is provided on the jib storage device 50 side and a long hole is provided on the short jib 20 side. May be provided or configured to perform the function of anti-rotation and winding under the guide means 52 by inserting a pin into and the pin hole and the elongated hole. Further, a link mechanism or the like may be used instead of the long hole and the pin, or a convex portion may be provided on the vehicle body side or the jib side instead of the pin.

  Further, in the above-described embodiment, the support portion 51 configured to support the long jib 20 placed in a vertical position is provided with the support rod 54 formed of a circular tube. Needless to say, for example, a horizontal pedestal may be provided, and the short jib 20 may be placed and supported on the pedestal.

1 Lower traveling body (car body)
13 Boom 15 Point Sheave 20 Short Jib 21 Sheave 22 Support Shaft 23 Foot Member 26 Suspension Rod 27 Bracket 29 Leg Member 31 Hanging Hook (Hoisting Device)
36 concave portion 37 support shaft 38 coupling pin 39b pin hole 50 jib storage device 51 support portion 52 rotation prevention and lowering guide means 54 support rod 55 vertical member 58 long hole 59 long pin (convex portion)
61 Guide plate

Claims (6)

A jib storage device for a wheel crane that stores a jib attached to the tip of the boom when in use, in a vertical position at a predetermined position on the vehicle body when not in use,
A support portion provided at a predetermined position on the vehicle body and supporting the jib in a vertical position;
An anti-rotation and lowering guide means for guiding the lowering of the jib while preventing the rotation of the jib while the jib is being unwound when the jib is suspended from the tip of the boom by the hoisting device on the supporting portion. A jib storage device for a wheel crane, comprising:   The rotation preventing and lowering guide means is provided on the vehicle body side or the jib side so that it can be inserted into the long hole or the grooved portion, and is provided in the jib side or the vehicle body side and extending in the vertical direction. The wheel crane jib storage device according to claim 1, further comprising a convex portion.   The jib includes a support shaft that rotatably supports a plurality of sheaves, a pair of left and right foot members that are respectively connected to both ends of the support shaft, and one end of each foot member that is connected to the support shaft. A pair of left and right suspension rods that are pivotably coupled to each other, and a pair of left and right leg members that are pivotally coupled to each other at intermediate portions of the respective foot members via brackets. At the time of use, the other end of each foot member and the other end of each suspension rod are respectively connected to a predetermined part of the boom tip so that the jib is attached to the boom tip, and the leg members are overlapped on the foot member side. When the jib is not used, the suspension rod and the leg member are superimposed on the foot member side and the sheave side is on the upper side The jib is placed and stored on the support part, and when the jib is removed from the tip of the boom and placed on the ground, the leg members are fixed in a state of protruding from the foot member so that the other end is grounded. The wheel crane jib storage device according to claim 1 or 2, wherein the wheel crane jib storage device is configured as described above.   The other end of each foot member of the jib is coupled by a pin in a state where a recess formed at the other end when the jib is used is fitted over the end of a spindle that supports the sheave at the tip of the boom. Has a support rod that is horizontally provided at a predetermined position on the vehicle body and has an outer diameter substantially the same as that of the support shaft, and the recess of each foot member of the jib is fitted on the support rod when the jib is not used. The jib storage device for a wheel crane according to claim 3, wherein each foot member of the jib is supported by being coupled with a pin in a state.   The lower ends of a pair of left and right vertical members extending upward are fixed to both ends of the support rod, and a long hole extending in the vertical direction is provided at the top of each vertical member. Opposite to the pin hole provided in the bracket of the middle part of each foot member of the jib during unwinding storage, and inserting the pin into this pin hole and long hole, the function of the rotation prevention and lowering guide means together with this pin is demonstrated The jib storage device for a wheel crane according to claim 4, wherein the jib storage device is a wheel crane.   A guide plate that guides the lower part of each vertical member so that the concave part of each foot member comes into contact with the support rod of the support part by contacting the end part of the concave part of each foot member of the jib when the jib is rolled down. The jib storage device for a wheel crane according to claim 5, wherein: