JP5352164B2 - Jib overhang storage device for crane equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jib extension/storage device for a crane device, capable of preventing a jib from being disengaged from a boom even when the boom is extended by making the jib continuously held on the boom side unless a foot attaching pin is attached in a locking hole at the base end of the jib. <P>SOLUTION: In this jib extension/storage device for the crane device, a rotatable jib storage link 56 is provided to the boom 21. The jib 36 is changeable between the side held state and the under folded state with the jib storage link 56. A jib holding arm 87 is rotatably provided to the boom 21 separately from the jib storage link 56. The pin holding hole 97 is provided to the projecting front end of the jib holding arm 87. The jib bolding pin 96 biased so as to be engaged with the pin holding hole 97 is provided to the jib 36. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a jib overhanging storage device for a crane device installed in a traveling vehicle, for example.

A crane device of a self-propelled crane uses a jib for the purpose of compensating the length of the boom or widening the pocket. The jib is stored along the boom when the jib is not in use, such as when traveling or after work is completed.
On the other hand, when the jib is used, the jib stored in the boom is extended. When extending the jib, first, the boom is reduced and the jib support shaft provided on the top head of the boom is inserted into the notch groove-shaped engagement hole formed at the base end of the jib, and the jib support shaft is A foot mounting pin is mounted on the entrance portion of the locking hole so as not to come out of the locking hole. Thereafter, the boom is raised, and the jib is projected forward from the retracted position so that the jib can be used.

  By the way, when the jib is extended from the storage position, the boom is raised.At this time, if the boom is raised without attaching the foot attachment pin to the jib engagement hole, And the jib becomes unstable, and there is a risk that the jib cannot be smoothly projected in a predetermined state.

Therefore, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2005-154071), when the boom is raised and the jib overhanging operation is started without mounting the foot mounting pin, the locking pin provided on the jib is used for fixing the boom. A jib fall prevention mechanism has been proposed in which the jib falls into the engagement hole of the bracket with its own weight and prevents further jib depression.
JP 2005-154071 A

  However, even if the above-described fall prevention mechanism of Patent Document 1 is provided, when the boom is extended beyond the engagement length of the locking hole at the base end of the jib, the boom-side jib support shaft comes out of the locking hole. As a result, the jib drop prevention function may not function sufficiently.

  The present invention has been made paying attention to the above problems, and the purpose thereof is to keep the jib held on the boom side unless the foot mounting pin is mounted in the locking hole at the base end of the jib. It is an object of the present invention to provide a jib overhanging storage device for a crane apparatus that prevents the jib from being detached from the boom even when the boom is extended.

The invention according to claim 1 is a jib overhanging storage device for a crane apparatus in which a jib is stored in a side surface of the boom along a longitudinal direction of the boom, and is rotatably supported by a support frame provided on the boom. A jib storage link capable of transferring the jib to a lower part of the boom and a side part of the boom by holding and rotating the jib, and a vertical direction independent of the jib storage link. A jib holding arm provided on the boom so as to be pivotable, and having a protruding length protruding downward from the jib storage link at a position where the jib storage link stores the jib in a side portion of the boom, and the jib A pin holding hole provided at the distal end portion of the holding arm and opened in the longitudinal direction of the boom, and provided in the jib and urged in the direction toward the proximal end side of the boom to hold the pin A jib projecting storage device of the crane apparatus being characterized in that anda jib retaining pin engageable with.
According to a second aspect of the present invention, there is provided a jib support provided in the jib and having a hole opened in the longitudinal direction of the jib, and provided in the boom, in a substantially longitudinal direction of the jib toward the tip side of the boom. 2. A jib overhang for a crane apparatus according to claim 1, further comprising a retractable lock pin that is urged in a protruding direction and is capable of entering and engaging with the hole of the jib support when facing the hole. It is a storage device.
According to a third aspect of the present invention, there is provided a stopper provided on the boom side, and a forward displacement of the jib that is provided on the jib side and hits the stopper when the jib is in a position to be stored in a side portion of the boom. 3. The jib overhanging storage device for a crane device according to claim 1 or 2, further comprising a forward slip prevention portion for preventing the above-described movement.

  According to the present invention, unless the foot mounting pin is attached to the locking hole at the base end portion of the jib, even if the jib is held on the boom side and the boom is extended, the jib does not come off the boom, I can keep it.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an entire self-propelled crane 1 which is a kind of mobile crane. The self-propelled crane 1 includes a traveling vehicle body 2 equipped with a crane device 3. A turntable (base) 5 is provided on the vehicle body frame 4 of the traveling vehicle body 2. The swivel base 5 is provided with a cab 6 in addition to the crane device 3. The cab 6 serves as a traveling cab and a crane operation room. Outriggers 7 and 8 are provided at a front part and a rear part of the body frame 4. Wheels 11 and 12 are provided in front of and behind the vehicle body frame 4 so as to be located closer to the center than the outriggers 7 and 8.

  As shown in FIGS. 1 and 2, the crane device 3 includes a telescopic boom 21 and a boom hoisting cylinder 22 for hoisting the telescopic boom 21. The telescopic boom 21 extends and contracts by telescopically extending the inner boom member by inserting a plurality of boom members in a stacked manner. The configuration of the telescopic boom 21 is as follows. A plurality of intermediate booms 26 and an innermost top boom 27 are sequentially stacked and inserted in a base boom 25 that is an outermost outer cylinder, and the intermediate boom 26 and the top boom 27 are not shown in the drawings. Is extended or retracted to extend and retract the entire boom length. The base end portion of the base boom 25 is pivotally attached to the swivel base 5. The boom hoisting cylinder 22 has its cylinder base pivoted to the swivel 5 and the tip of the rod is connected to the lower surface of the base boom 25.

  A top head (sheave block) 31 is provided at the tip of the top boom 27. The top head 31 is always provided so as to protrude from the tip of the base boom 25. The top head 31 is provided with a guide sheave 32 and a rooster sheave 33 for guiding the wire. On the left and right side surfaces of the top head 31, shaft-shaped jib support shafts (jib foot portions) 35 projecting sideways are provided. A base end portion of a jib 36 to be used is engaged with and pivotally attached to the pair of left and right jib support shafts 35 (see FIG. 3). The jib 36 may be a fixed length having a fixed length or a multistage jib whose total length can be adjusted.

  As shown in FIG. 4, the base end portion of the jib 36 has a pair of left and right mounting arms 37 that branch left and right. As shown in FIG. 3, a pair of upper and lower protrusions 38 protruding in a fork shape are formed at the distal ends of the pair of left and right mounting arms 37, and a long cut in the longitudinal direction of the jib 36 between the pair of upper and lower protrusions 38. A notch-like engagement hole 39 is formed in a groove shape. The base end side of the engaging hole 39 opens toward the base end side of the jib 36. Then, the left and right jib support shafts 35 on the top head 31 are respectively fitted in the engaging holes 39 of the pair of left and right mounting arms 37 so that the base end portion of the jib 36 can be pivotally attached to the jib support shaft 35. ing. Thereby, the engaging part which pivotally attaches the jib 36 to the front-end | tip in the top boom 27 of the telescopic boom 21 is comprised.

  As shown in FIG. 3, an insertion hole 40 in which a foot mounting pin 41 can be removably inserted is formed at the tip of the pair of protrusions 38 forming the engagement hole 39 so as to cross the engagement hole 39. Yes. When the foot attachment pins 41 are attached to these insertion holes 40, the jib support shaft 35 fitted into the attachment holes 39 is in a jib connection state that does not come off the attachment holes 39 (see FIG. 3). Further, when the foot mounting pin 41 is pulled out, the inlet of the mounting hole 39 is opened, so that the jib 36 can be detached from the jib support shaft 35.

  As shown in FIGS. 2 and 4, a jib top sheave 45 is provided at the tip of the jib 36. In the vicinity of the tip of the jib 36, a connecting portion for pivotally attaching the tip of a tension rod (not shown) is provided. On the lower surface of the jib 36, a rod support 46 for holding the tension rod is provided at an appropriate position.

  A holder mounting bracket 51 for storing the jib 36 along the base boom 25 of the multi-stage telescopic boom 21 and a front end side of the holder mounting bracket 51 in the middle of the longitudinal direction of the jib 36. A mounting plate 52, which will be described later, is provided.

  On the other hand, as shown in FIG. 4, a jib holder 55 for storing the jib 36 is provided on the base boom 25 side. The jib holder 55 holds a holder mounting bracket 51 provided on the jib side. The jib holder 55 includes a jib storage link 56 that is engaged with the holder mounting bracket 51, and the jib 36 is held by the jib storage link 56.

  As shown in FIG. 4, the jib storage link 56 has an integral frame structure in which two plate members 57 are fixedly connected at a position where two plate members 57 having the same rectangular shape are separated from each other in the front-rear direction. It has become. The jib storage link 56 is pivotally attached to a pivot shaft 58 disposed at a relatively lower position on the side surface of the base boom 25. The pivot shaft 58 is supported by a support frame 61 provided on the side surface of the base boom 25 as shown in FIGS. 4 (A), (B), and (C). The support frame 61 is composed of a pair of plate-like cross members 62 that are arranged apart from each other in the longitudinal direction of the boom. By supporting both end portions of the pivot shaft 58 on the pair of cross members 62, the pivot shaft 58 is attached to the support frame 61 while being spanned over the cross members 62. Therefore, the jib storage link 56 can be rotated in the vertical direction while the movement in the front-rear direction is restricted within the region corresponding to the width of the cross member 62 of the support frame 61.

  The pivot shaft 58 is inserted into a shaft hole 59 provided through a corner portion located on the boom side on the upper side of the jib storage link 56 in the state of holding the jib shown in FIGS. 5A and 5B (FIGS. 5A and 5B). (Refer to (A) and (B)), the jib storage link 56 is supported to be rotatable in the vertical direction. The jib storage link 56 is pivotally attached to the pivot shaft 58, so that the jib 36 is stored from the lower holding position (stored in the lower part of the boom) to the side holding position (side of the boom). It is held in a transferable state in which it moves to the state) or vice versa.

  As shown in FIG. 4B, the support frame 61 is provided with a jib holder drive cylinder 65. The base end portion of the jib holder drive cylinder 65 is pivotally attached to the upper portion of the support frame 61, and the rod 66 is pivotally attached to the rotational end side portion of the jib storage link 56 via a connecting pin 67. By extending and contracting, the jib storage link 56 is rotated.

  4A, 4B, and 4C, pin insertion holes 71 that penetrate in the longitudinal direction of the boom are provided at the corners of the lower side of the jib storage link 56 at the jib holding position shown in FIGS. 5 (A) and (B)). Separate mounting pins 41 are detachably inserted into the respective pin insertion holes 71. The mounting pin 41 also serves as the foot mounting pin 41 described above. Of course, separate pins may be used.

  4A, 4B, and 4C, a lock hole 76 into which the storage lock pin 78 is inserted is formed in the longitudinal direction of the boom 21 at the corner on the protruding side of the upper side of the jib storage link 56 at the jib holding position. It is provided so that it may penetrate along. The lock hole 76 faces the lock hole 77 formed in the cross member 62 of the support frame 61 when the jib storage link 56 is pivoted upward and faces the lock hole 77 formed in the cross member 62. The storage lock pin 78 is inserted over the hole 77 to lock the jib storage link 56 in the raised position.

  On the other hand, as shown in FIGS. 4B and 4C, the holder mounting bracket 51 is separated from the front and rear in the longitudinal direction of the jib 36 and is held by a pair of plate-like cross members 81 attached to the jib 36. Consists of. The holding frame 82 is detachably mounted in a state of being attached to the surface of the jib 36 shown in FIGS. 4 (B) and 4 (C) and positioned on the upper side, and is attached to a bracket 84 provided on the side surface of the jib 36. On the other hand, it is detachably coupled. Here, the holder mounting bracket 51 is detachable from the jib 36, but may be fixed to the jib 36.

  As shown in FIGS. 4B and 4C, when the jib storage link 56 is rotated and positioned downward, the lower part of the jib storage link 56 enters the frame of the holder mounting bracket 51. The pin insertion hole 71 is also positioned within the frame of the bracket 51 after being positioned.

  As shown in FIG. 4 (B), the cross member 81 of the holder mounting bracket 51 is provided with two front and rear pin insertion holes 85 penetrating in the longitudinal direction of the jib. The foot mounting pin 41 can be inserted and mounted over the pin insertion hole 71 of the jib storage link 56 when it is disposed at a position where it can face and coincide with the pin insertion hole 71 of the jib storage link 56 that has entered the frame. When the foot mounting pin 41 is inserted through the pin insertion hole 71 and the pin insertion hole 85 of the jib storage link 56, the holder mounting bracket 51 and the jib storage link 56 as shown in FIGS. Can be connected.

  4B, 5C, and 5B, the support frame 61 has a jib holding arm 87, which is a link member different from the jib storage link 56, and the jib holder 55. It is provided in a state where it can rotate independently. The jib holding arm 87 is pivotally supported on the support frame 61 in a coaxial relationship with the jib storage link 56 using the pivot shaft 58. Therefore, it can be considered that the jib holding arm 87 is pivotally attached to the jib storage link 56. The jib storage link 56 may be pivotally attached to the jib storage link 56 using a pivot shaft different from the pivot shaft. Furthermore, you may make it pivotally mount on the base boom 25 side using another member, without utilizing the said support frame 61. FIG. Here, the jib holding arm 87 and the jib storage link 56 can be independently rotated separately. The jib holding arm 87 is disposed on the front side of the jib storage link 56 in the boom axis direction. Further, the base portions of the jib storage link 56 and the jib holding arm 87 are both disposed in a region corresponding to the width between the pair of cross members 62 when viewed from the side of the boom, and the pair of cross members 62 move in the boom axial direction. Movement is restricted.

  As shown in FIGS. 5A and 5B, the jib storage link 56 is provided with a first stopper 91 against which the jib holding arm 87 hits when rotated upward. The rotation of the jib holding arm 87 to the upper side is restricted. The support frame 61 is provided with a second stopper 92 against which a jib holding arm 87 rotated downward is brought into contact, and the jib holding arm 87 rotated downward is brought into contact with the second stopper 92 to hold more jib. The rotation of the arm 87 is restricted. That is, the position where the jib holding arm 87 hits the first stopper 91 is the upper end of rotation of the jib holding arm 87, and the position where the jib holding arm 87 hits the second stopper 92 is turned downward of the jib holding arm 87. When it does, it becomes the downward rotation end. Further, since the jib holding arm 87 rotates independently from the jib storage link 56, the terminal position of the upward rotation varies depending on the rotation position of the jib storage link 56. The upward rotation end position of the jib storage link 56 varies depending on the position of the first stopper 91 that follows the rotation of the jib storage link 56.

As a result, as shown in FIG. 5A, when the jib storage link 56 is rotated upward, the space between the first stopper 91 and the second stopper 92 is widened, and the first stopper 91 and the second stopper 92 are expanded. It can be rotated between the stoppers 92. On the other hand, as shown in FIG. 5B, when the jib storage link 56 is rotated downward , the jib holding arm 87 is positioned and fixed at a position between the first stopper 91 and the second stopper 92.

  The support frame 61 is provided with a storage state detection switch 93 for detecting the position of the jib storage link 56 as shown in FIG. The holder mounting bracket 51 is provided with a front shift prevention stopper 94 that faces the side surface of the jib storage link 56 and prevents the front shift of the jib 36 held by the jib storage link 56. The front displacement prevention stopper 94 can be adjusted in position to prevent front displacement by a screw.

  As shown in FIGS. 5A and 5B, a holding hole 97 for inserting the jib holding pin 96 is provided in the rotating tip end portion of the jib holding arm 87 so as to penetrate along the longitudinal axis direction of the boom. Yes. A pin receiving portion 98 is provided around the holding hole 97.

  As shown in FIG. 4B, the holder mounting bracket 51 is provided with a holding frame 99 for supporting the jib holding pin 96. As shown in FIGS. 4B and 4C, the holding frame 99 includes a guide cylinder 101 and a guide piece 102 through which the jib holding pin 96 is movable along the longitudinal direction of the jib. The guide cylinder 101 is attached to the holder mounting bracket 51, and the guide cylinder 101 and the guide piece 102 are connected and supported by a holding piece 103. The jib holding pin 96 is provided with a stopper piece 106 so as not to rotate around the axis, and is assembled to the guide cylinder 101 and the guide piece 102. The stopper piece 106 is fixed to the guide tube 101 by welding or the like.

  As shown in FIG. 4C, a coil spring 105 as a biasing member is wound around the jib holding pin 96. The coil spring 105 urges the jib holding pin 96 to protrude toward the holding hole 97 of the jib holding arm 87. The jib holding pin 96 holds the jib holding pin 96 in a predetermined protruding state, and the protruding amount of the jib holding pin 96 is a nut screwed into a screw portion formed at the rear end portion of the jib holding pin 96. It can be adjusted by rotating.

  The protruding tip of the jib holding pin 96 is provided with a slope 108 that curves obliquely as shown in FIG. The slope 108 serves as a guide for retracting the jib holding pin 96 against the urging force of the coil spring 105 when the protruding tip of the jib holding pin 96 hits the jib holding arm 87. That is, when the jib holding arm 87 rotates and hits the inclined surface 108 at the tip of the jib holding pin 96, the jib holding pin 96 is pushed and retracted against the urging force of the coil spring 105, and the jib holding pin 96 and the holding hole 97. The jib holding pin 96 automatically enters and engages with the holding hole 97 by the urging force of the coil spring 105 at a position where the two coincide with each other.

  Further, as shown in FIG. 4C, no slope is formed on the opposite side of the slope 108 at the tip of the jib holding pin 96. In other words, since no slope is formed on the side of the jib holding arm 87 in the direction in which the jib holding pin 96 comes out, once the jib holding pin 96 enters the holding hole 97, the jib holding arm 87 is held even if it tries to rotate. It is difficult to come off from the hole 97.

  On the other hand, as shown in FIGS. 6A, 6B and 6C, the base boom 25 is provided with a jib support 110 for supporting the mounting plate 52 of the jib 36 when the jib 36 is stored. ing. The jib support 110 includes a fixing bracket 121 that is fixed to the lower portion of the side wall surface of the base boom 25, and a lock pin holding frame 122 that is provided at the protruding tip of the fixing bracket 121. The lock pin holding frame 122 includes front and rear two plate portions 126 and 127 that support the lock pin 125 so as to be movable in the longitudinal direction of the boom, and a guide plate portion 128 disposed in front of the front plate portion 126. . As shown in FIG. 6B, a coil spring 129 as an urging member is wound around the middle portion of the lock pin 125 between the two plate portions 126 and 127. In FIGS. 6A and 6C, the coil spring 129 is not shown. The lock pin 125 is urged so as to protrude forward by the urging force of the coil spring 129.

  The front plate portion 126 is attached with a guide cylinder portion 131 into which the thickened tip portion of the lock pin 125 protruding forward is inserted. A guide portion for guiding the lock pin 125 in the longitudinal axis direction of the boom is constituted by the front and rear two plate portions 126 and 127 and the guide cylinder portion 131 of the lock pin holding frame 122. When the lock pin 125 protrudes from the front end of the guide cylinder 131 to the position shown in FIG. 6B, the nut 132 located at the rear end of the lock pin 125 hits the rear plate 127 and is stopped.

  As shown in FIG. 6 (B), an inclined surface 133 is formed at the distal end portion of the guide cylinder 131 by being cut obliquely. Similarly, the front end portion of the lock pin 125 facing the surface 133 is also formed with an inclined surface 135 that is cut obliquely. Since the attachment plate 52 on the jib 36 side contacts the surface 135 of the lock pin 125 when entering the lock pin holding frame 122, the attachment plate 52 on the jib 36 side moves to the front portion of the guide cylinder 131 while retracting the lock pin 125. You can enter. On the other hand, a guide surface 54 that assists the guide function is also formed at the tip of the mounting plate 52. Therefore, the mounting plate 52 is smoothly guided to a predetermined position and can automatically enter.

  As shown in FIGS. 6A, 6B, and 6C, the guide plate 128 of the jib support 110 is provided with a guide receiving plate 138. The guide receiving plate 138 holds the jib 36 under the holding state. At this time, a guide roller 137 provided on the side of the jib 36 hits and guides to a predetermined position.

  On the other hand, as shown in FIGS. 6A, 6 </ b> B, and 6 </ b> C, the attachment plate 52 provided on the jib 36 side is attached to the bracket 111 fixed to the upper surface of the jib 36. The mounting plate 52 protrudes upward from the bracket 111 substantially perpendicular to the outer surface of the jib 36. A lock hole 140 into which the above-described boom-side lock pin 125 is fitted is formed at the protruding tip portion of the mounting plate 52.

  As shown in FIGS. 6A and 6B, the mounting plate 52 is provided with a plate-like first forward shift prevention portion 142 that protrudes in a substantially horizontal direction on the upper surface of the jib 36 that is in the hugging and retracting state. It has been. Although the first forward shift prevention part 142 is formed integrally with the attachment plate 52, it may be attached to the attachment plate 52 as a separate member. The first forward shift prevention portion 142 attached to the attachment plate 52 is formed so as to protrude in a horizontal direction substantially parallel to the upper surface of the jib 36 in the under-holding storage state.

  The bracket 111 is provided with the above-described guide roller 137 located on the front side of the boom (the base end side of the jib) from the position of the mounting plate 52. The guide roller 137 and the central projecting portion 55a in which the lock hole 140 of the mounting plate 52 is formed are arranged so as to face each other in the longitudinal direction of the jib 36. As shown in FIG. 6 (A), the first forward shift prevention part 142 is arranged in a state of protruding from the facing region in a horizontal direction and shifted to the side of the boom. The above-described jib support 110 is provided with a plate-like first front displacement regulating stopper member 145 located in a region between the plate portion 126 located on the front side of the boom and the guide plate portion 128. In the posture shown in FIG. 6A in which the jib 36 is held under the holding state, the first forward deviation restricting stopper member 145 is provided at a position that does not interfere with the mounting plate 52 on the jib 36 side. Further, when the jib 36 is held in the horizontal holding state as shown in FIG. 6C, the first forward-slip prevention part 142 rises from the mounting plate 52, so that the tip of the guide cylinder 131 and the first forward-slip The narrow gap 146 between the restriction stopper member 145 and the rear end is entered. When the jib 36 is held sideways, the lock pin 125 enters and engages with the lock hole 140 of the mounting plate 52 to restrict the rotation of the jib 36, and at the same time, the first forward-prevention prevention portion 142 is the first front. It is positioned facing the rear end of the displacement restricting stopper member 145 and enters a narrow gap 146 between the front end of the guide cylinder 131 and the rear end of the first front displacement restricting stopper member 145. For this reason, when the jib 36 is in the horizontal holding state, the forward displacement of the jib 36 is regulated by the first forward displacement regulating stopper member 145.

  As shown in FIGS. 9 and 10, the mounting plate 52 is provided with a second forward shift prevention portion 151 that protrudes downward from the mounting plate 52 in a state where the jib 36 is held underneath. The second forward shift prevention portion 151 is formed integrally with the attachment plate 52, but may be attached to the attachment plate 52 as a separate member. As shown in FIG. 9, a front shift prevention plate 153 is attached to the lower end of the second front shift prevention portion 151. The reason why the forward slip prevention plate 153 inclines toward the pivot center of the boom in this way is that when the telescopic boom 21 is laid down to near horizontal, the forward slip prevention plate 153 of the jib 36 attached to the telescopic boom 21 is also This is to prevent the front displacement prevention plate 153 from interfering with the tip end portion of the stopper 162 during the overturning operation of the boom 21 or from being separated too much because the arc-shaped locus is drawn and rotated.

  As shown in FIGS. 7 to 10, the base on the vehicle body side that supports the telescopic boom 21, here the swivel base 5 is located at a position that can correspond to the second forward shift prevention portion 151, as described above. A second front displacement restricting stopper member 155 that can hit the displacement preventing portion 151 is provided. The second forward displacement restricting stopper member 155 includes a pin-shaped stopper 162 attached by screwing into a bracket 161 provided on the front inclined surface portion of the swivel base 5. The stopper tip of the stopper 162 protrudes from the bracket 161 to the rear of the swivel base 5 as shown in FIG. The amount of protrusion of the stopper tip toward the rear of the bracket can be adjusted by selecting the screwing amount of the pin-like stopper 162 with respect to the bracket 161.

  The portion of the second forward displacement prevention portion 151 provided on the mounting plate 52 on the jib 36 side is raised and lowered with the raising and lowering of the jib 36 that is raised and lowered together with the base boom 25 of the telescopic boom 21. Can come into contact with the stopper 162 at a position where it is almost lying down. Specifically, as shown in FIG. 23A, the second forward shift prevention portion 151 enters the height position of the stopper 162 at the boom most-down position where the base boom 25 is most bent down. When the jib 36 tries to move forward at this position, the portion of the second forward deviation prevention portion 151 hits the stopper 162, and the forward movement of the jib 36 is prevented by suppressing the forward movement of the jib. Here, the boom most depressed position is a state in which the base boom 25 is substantially horizontal or the boom front end side is inclined lower than the boom base end side. In this embodiment shown in FIGS. It is assumed that the boom 25 is substantially horizontal.

  Further, the main body portion of the second forward deviation preventing portion 151 is retracted to the raised position where the stopper 162 does not hit at the position of the boom lowest position + α shown in FIG. However, the front displacement prevention plate 153 remains, and the front displacement prevention plate 153 is in a position where it can hit the stopper 162. For this reason, when the jib 36 tries to move forward, the stopper 162 hits the forward displacement prevention plate 153 when it moves slightly, and the forward movement of the jib can be prevented by preventing the forward movement of the jib. The front displacement prevention plate 153 that exhibits such a function can be regarded as a portion that functions as the second front displacement prevention portion 151.

  On the other hand, as shown in FIG. 23 (C), when the base boom 25 rises substantially horizontally or more and the boom forward position rises upward, the second forward slip prevention portion in the mounting plate 52 on the jib 36 side. Neither 151 nor the front displacement prevention plate 153 is retracted above the stopper 162 and does not hit the stopper 162 even if the jib 36 moves forward. When the base boom 25 is raised, the jib 36 is free to move forward.

  By the way, in a state where the boom extension operation lever is set to the neutral position after the telescopic boom 21 is contracted to the minimum position at the boom most-down position where the base boom 25 is most depressed, pressure oil wraps around the extension circuit of the telescopic boom 21; There is a case where the natural expansion occurs in the volume change such as the temperature change of the hydraulic oil in the boom telescopic cylinder. For this reason, if the tip of the jib 36 is connected to the tip of the boom, the jib 36 may be tangled and extended. However, in the present embodiment, the jib 36 is held on the swivel base 5 by the function of the second forward shift prevention unit 151 so that the forward shift of the jib can be prevented.

  Next, the procedure of the jib swing operation in the present embodiment will be described. When the jib 36 is not used, the jib 36 is stored on the side surface of the base boom 25 in a lateral holding state as shown in FIG. When in the side-holding storage state, as shown in FIG. 11D, the first forward shift prevention portion 142 is in a state in which the forward shift movement is suppressed by the first forward shift restricting stopper member 145. In FIGS. 11B, 11C, and 11D, the jib 36 is not shown for easy viewing.

  When swinging out the jib 36 from this jib storage state, as shown in FIG. 12A, only the top boom 27 is slightly extended and the top head 31 is retracted forward. In this state, the jib holder drive cylinder 65 is extended, the jib storage link 56 is rotated downward to cause the jib 36 to be side-down, and the jib 36 is held under the base boom 25. At this time, the first forward shift prevention portion 142 that rotates together with the mounting plate 52 is separated from the position of the first forward shift restricting stopper member 145, and the jib 36 is moved to the first position as shown in FIG. Thus, the vehicle can move forward without being restricted by the forward displacement restricting stopper member 145.

  On the other hand, since the base boom 25 is in a face-down state and the jib 36 is in a hugging state, the portion of the second forward slip prevention portion 151 provided on the mounting plate 52 on the jib 36 side is as shown in FIG. It enters the height position of the stopper 162 on the swivel base 5 side. Even if the jib 36 is about to move forward, the portion of the second forward shift prevention portion 151 hits the stopper 162 and the jib forward movement is suppressed.

The top boom 27 is pulled back in the retracted state of the underarm. Then, the jib support shaft 35 in the top head 31 is inserted into the engagement hole 39 of the jib 36. Then, the foot mounting pin 41 is pulled out from the pin insertion hole 71 of the jib storage link 56, and this foot mounting pin 41 is mounted between the tips of the pair of protrusions 38 that form the engaging holes 39 of the jib 36. The jib 36 is connected. (Although the same foot mounting pin 41 is used repeatedly, another pin may be used without replacing the foot mounting pin 41.)
At this time, the telescopic boom 21 may be in a state of being turned down so that the telescopic boom 21 can be easily operated for convenience of work. Yes, the jib 36 is also lowered forward. For this reason, the jib 36 tends to move forward by its own weight. However, the portion of the second forward slip prevention portion 151 provided on the mounting plate 52 on the side of the jib 36 is shown in FIG. 23 (A) at the boom most-down position where the base boom 25 shown in FIG. As shown, the stopper 162 provided on the swivel base 5 enters the height position. Therefore, even if the jib 36 tries to move forward, the portion of the second forward shift prevention portion 151 hits the stopper 162 to prevent the forward movement of the jib and prevent the forward shift of the jib 36.

  Next, as shown in FIGS. 13A, 13 </ b> B, and 13 </ b> C, the jib holder drive syringe 65 is reduced and the jib storage link 56 is rotated upward to side up the jib storage link 56. The jib storage link 56 is stored at the raised position. At this time, since the jib holding pin 96 is still inserted into the holding hole 97 of the jib holding arm 87, the jib holding arm 87 remains as it is, and the jib holding arm 87, the jib holding pin 96 and the holding frame 99 are interposed. The jib 36 is held by the jib holder 55 and held in a hugging state. Further, the jib holding arm 87 is in a state of protruding downward from the jib storage link 56, and only the jib storage link 56 is retracted upward while leaving the jib holding arm 87.

  In the state shown in FIG. 14A in which the jib 36 is held below, the auxiliary rope 170 is bridged over the auxiliary winding hook 171 and the jib top sheave 45 of the jib 36 and hung on the storage bracket 173 of the jib 36. Then, the boom 21 is raised and the top boom 27 is extended.

  As a result, the jib holding pin 96 comes out of the holding hole 97 of the jib holding arm 87 as shown in FIGS. At this time, the lock pin 125 in the jib support 110 at the rear of the boom is fitted in the hole of the mounting plate 52, and the state where the jib 36 is held is maintained (see FIG. 14D). Further, the portion of the second forward shift prevention portion 151 is also retracted from the stopper 162 on the swivel base 5 side.

  Next, as shown in FIG. 15A, when the top boom 27 is further extended, the jib 36 is pulled up, and the lock pin 125 in the jib support 110 at the rear of the boom is pulled out of the mounting plate 52 to release the jib 36. (See FIG. 15D). Further, the jib holding arm 87 is also released (see FIGS. 15B and 15C).

  Then, as shown in FIGS. 16A, 16 </ b> B, and 16 </ b> C, the jib 36 falls by the amount of slack of the auxiliary rope 150. The auxiliary rope 150 is further loosened so that the jib 36 is projected. The procedure for overhanging the jib 36 is as described above.

  Even if the foot mounting pin 41 is forgotten to be mounted between the tips of the engaging holes 39 of the jib 36 and the top head 31 and the jib 36 are not connected, the overhanging operation is continued and the top boom 27 is temporarily extended. The jib 36 cannot be pulled up. For this reason, since the jib holding pin 96 does not come out of the holding hole 97 of the jib holding arm 87, the jib 36 can be held by the jib holding arm 87. Therefore, the jib 36 is not released alone. Further, there is no possibility that the jib 36 protrudes in an unstable state where the jib 36 is not connected to the jib support shaft 35. Further, the lock pin 125 in the jib support 110 at the rear of the boom does not come out of the mounting plate 52 in the same manner.

  Next, the jib storage procedure of this embodiment will be described. First, as shown in FIGS. 17 (A), (B), (C), and (D), with the boom 21 raised, the auxiliary rope 170 is bridged between the auxiliary winding hook 171 and the jib top sheave 45 of the jib 36, It is hung on the storage bracket 173 of the jib 36. Then wind up the supplementary rope. Then, as shown in FIG. 18 (C), the lock pin 125 in the jib support 110 at the rear of the boom is automatically fitted and engaged with the hole of the mounting plate 52 on the jib 36 side. Further, the guide roller 137 hits and engages with the guide receiving plate 138. The jib storage link 56 so far is in the storage position rotated upward as shown in FIGS. 17 (B) (C) and 18 (A) (B).

  Next, as shown in FIG. 19 (A), the boom is in its lowest position, and the jib storage link 56 is extended in this state. By extending the jib storage link 56, the stopper 91 pushes out the jib holding arm 87. Then, as shown in FIGS. 20A and 20B, the jib holding pin 96 is automatically fitted into the holding hole 97 of the jib holding arm 87. At this stage, the jib 36 is held by the boom. Even if it is overlooked that the foot mounting pin 41 is mounted on the jib storage link 56 to be performed in the next work process, the jib 36 does not come off. At this time, since the boom is in the lowest position, the jib-side second forward-prevention preventing portion 151 hits the stopper 162 on the swivel base 5 and is in the jib-front-prevention-preventing state that suppresses jib forward movement. .

  Next, the foot mounting pin 41 at the base end of the jib 36 is pulled out, the foot mounting pin 41 is inserted into the pin insertion hole 71 of the jib storage link 56, and the jib storage link 56 is connected to the holder mounting bracket 51.

  Next, as shown in FIG. 21, the boom is extended and the top head 31 is retracted, and then the jib 36 is side-upped to be in a horizontal holding state. In this side-holding state, as described above, the forward displacement prevention stopper 94 performs the forward displacement prevention function, thereby preventing the forward displacement of the jib 36. The jib front shift prevention function by the jib side second front shift prevention part 151 and the stopper 162 on the swivel base 5 is released.

  Further, when the jib 36 is held in the horizontal holding state as shown in FIG. 6C, the first forward-slip prevention part 142 rises from the mounting plate 52, so that the tip of the guide cylinder 131 and the first forward-slip The narrow gap 146 between the restriction stopper member 145 and the rear end is entered. When the jib 36 is held sideways, the lock pin 125 enters and engages with the lock hole 140 of the mounting plate 52 to restrict the rotation of the jib 36, and at the same time, the first forward-prevention prevention portion 142 is the first front. It is positioned facing the rear end of the displacement restricting stopper member 145 and enters a narrow gap 146 between the front end of the guide cylinder 131 and the rear end of the first front displacement restricting stopper member 145.

  The top head 31 is pulled back as shown in FIG. As a result, the jib 36 is in the retracted state as shown in FIG. 2, and is stored in the boom in a posture slightly inclined along the longitudinal axis direction of the boom, thereby completing a series of storing operations.

  Further, when the jib 36 is moved from the lower holding position to the horizontal holding position by the jib holder driving syringe 65, the jib 36 is rotated and moved. When the jib rotation center axis at this time is set so as to pass near the center of gravity G of the jib 36, the jib 36 It is possible to reduce the jib rotation when 36 is displaced, and to prevent shaking.

The side view which shows the whole self-propelled crane. (A) is a side view which shows roughly the crane apparatus with which a self-propelled crane is equipped, (B) is a top view which shows the crane apparatus schematically. The side view which expands and shows the one end part of the base end part of the jib engaged with a boom front-end | tip. (A) is a perspective view of the boom holding the jib in the holding state of the underarm, (B) is an enlarged view of the X part of (A) in a state where the boom-side jib holder is connected to the above-mentioned jib holder mounting bracket. FIG. 7C is a cross-sectional view taken along the center of the jib holding pin of the X part of FIG. 8A in a state where the bracket for attaching the jib holder and the jib holder on the boom side are coupled together. (A) and (B) are cross-sectional views showing, in an enlarged manner, the Y portion of FIG. 4 in a state in which the jib holder mounting bracket and the boom-side jib holder are connected. (A) is a perspective view in the holding state where both the jib attachment plate and the jib support supporting the jib are engaged, and (B) is both the jib attachment plate and the jib support supporting the same. FIG. 4C is a perspective view in a side-holding storage state in which both a jib attachment plate and a jib support supporting the jib are engaged. The perspective view of the turntable vicinity which provided the 2nd front deviation control stopper part. The perspective view which expands and shows the X section in FIG. The side view of the 2nd stopper part for forward deviation control. The longitudinal cross-sectional view of the 2nd stopper part for front deviation control. Explanatory drawing which shows the swing-out procedure of a jib. Explanatory drawing which shows the swing-out procedure of a jib. Explanatory drawing which shows the swing-out procedure of a jib. Explanatory drawing which shows the swing-out procedure of a jib. Explanatory drawing which shows the swing-out procedure of a jib. Explanatory drawing which shows the swing-out procedure of a jib. Explanatory drawing which shows the storing procedure of a jib. Explanatory drawing which shows the storing procedure of a jib. Explanatory drawing which shows the storing procedure of a jib. Explanatory drawing which shows the storing procedure of a jib. Explanatory drawing which shows the storing procedure of a jib. Explanatory drawing which shows the storing procedure of a jib. Explanatory drawing which shows the storing procedure of a jib.

Explanation of symbols

3 ... Crane device, 21 ... Telescopic boom, 25 ... Base boom, 36 ... Jib,
41 ... Foot mounting pin, 56 ... Jib storage link, 87 ... Jib holding arm,
96 ... Jib holding pin, 97 ... Pin holding hole, 142 ... First forward slip prevention part,
145... First forward deviation restricting stopper member 151, Second forward deviation prevention portion,
155... Second forward deviation restricting stopper member, 162.

Claims (3)

In the jib overhanging storage device of the crane apparatus, in which the jib is stored on the side surface of the boom along the longitudinal direction of the boom,
A jib that is rotatably supported by a support frame provided on the boom and that can move the jib to a lower part of the boom and a side part of the boom by holding and turning the jib. A storage link;
Protruding length protruding downward from the jib storage link at the position where the jib storage link is stored in the side part of the boom at a position where the jib is stored in the boom so as to be pivotable in the vertical direction independently of the jib storage link. A jib holding arm having
A pin holding hole provided at the tip of the jib holding arm and opened in the longitudinal direction of the boom;
A jib holding pin provided on the jib, biased in a direction toward the base end side of the boom, and engageable with the pin holding hole;
A jib overhanging storage device for a crane device, comprising: A jib support provided on the jib and having a hole opened in the longitudinal direction of the jib;
A storage lock pin provided on the boom, biased in a direction protruding in a substantially longitudinal direction of the jib toward the tip side of the boom, and capable of entering and engaging the hole when facing the hole of the jib support;
The jib overhanging storage device for a crane device according to claim 1, comprising: A stopper provided on the boom side;
A forward slip prevention portion that is provided on the jib side and prevents the forward shift of the jib by hitting the stopper when the jib is in a position to be stored in a side portion of the boom;
The jib overhanging storage device for a crane device according to claim 1 or 2, characterized in that

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