JP2006282361A5 - - Google Patents

Description

Crane equipment with extension jib

  The present invention relates to a crane device with an extension jib in which an extension jib is formed by adding a plurality of jib components to the tip of the extension boom of a crane vehicle provided with an extension boom. It relates to the structure of the tip of the extension jib.

  2. Description of the Related Art Conventionally, a crane device with an extension jib that is configured by further attaching an extension jib to the distal end of the telescopic boom is known (for example, see Patent Document 1).

  By the way, the crane device with an extension jib is essentially an elevator boom that is raised at a high elevation angle, and is attached to the tip of the extension boom so that the jib can be raised and lowered, and a hook block is attached from the tip of the extension jib. Suspending work can be performed with a high lift and a large working radius (a so-called luffing jib structure).

  However, in recent years, suspension work with a small work radius, high lift, and heavy load has been required, such as construction work for wind turbine power generation facilities that require installation of heavy objects at extremely high places. Increased.

  In order to meet such a demand in the work form, for example, in a crane apparatus having a luffing jib structure, a large work radius is not required. Therefore, the telescopic boom and the extension jib are both raised at a high elevation angle. Thus, the extension jib is suspended at a position close to the jib abdominal surface. Similarly, in a crane apparatus having a construction in which the extension jib is fixedly attached to the tip of the telescopic boom, the extension boom and the jib are integrally raised at a high elevation angle, and the extension jib is Hanging is performed at a position close to the jib abdomen.

  On the other hand, the hook block is suspended from the tip sheave provided at the tip of the extension jib. The shorter the axial length of the extension jib, the more advantageous in terms of strength performance. For this reason, instead of the conventional general arrangement structure in which the tip sheave is added and placed at a position close to the jib axis of the jib, the tip sheave is added and protruded toward the jib abdomen side, The axial length of the extension jib is shortened.

JP-A-63-180695.

  By the way, normally, an additional jib is disassembled and transported by being mounted on a vehicle for each jib component at the time of transportation. However, with the recent increase in the size of a crane apparatus, the joint jib is used. The added jib tends to increase in size, and naturally, each jib structure constituting the added jib is also increased in size.

  In this case, in the tip end jib structure of the extension jib having a configuration in which the tip sheave protrudes toward the jib belly surface side, when the tip sheave is mounted on the loading platform of the vehicle and transported, the tip sheave is the jib belly surface. Since the tip sheave portion is obstructed by the amount protruding to the side, the mounting work on the loading platform of the vehicle is troublesome and takes time, and in the state where the additional jib is mounted on the loading platform, its height is There is a concern that it will become higher and the safety during transportation will be impaired.

  As described above, in addition to the configuration in which the tip sheave projects to the abdomen surface side of the jib as described above, the support portion for supporting the sheave or the tension means is disposed in a projecting state to the back side of the jib. In addition to the jib, it is even more prominent, and there is a strong demand for improvement.

  Therefore, in the present invention, in the crane device with an extension jib, it was made for the purpose of ensuring the workability and transportation safety of loading and unloading the jib structure on the vehicle bed accompanying the disassembly and transportation of the extension jib. is there.

  In the present invention, the following configuration is adopted as a specific means for solving such a problem.

  In the first invention of the present application, an extension jib 5 configured by sequentially adding a plurality of jib constituent bodies 5A to 5F and 6A to 6E in the axial direction to the tip 3b of the telescopic boom 3 provided in the crane vehicle X, In the crane device with an extension jib to which 6 is attached, the tip sheave in a protruding state toward the jib abdominal surfaces 5a, 6a at the tip of the tip jib constituting bodies 5F, 6E located on the tip side of the extension jib 5, 6 26, and the tip sheave 26 is configured to be retractable toward the jib axis L1.

  In the second invention of the present application, in the crane device with an extension jib according to the first invention, the tip sheave 26 is pivoted by the pivot member 25 pivotally supported on the tip jib constituting body 5F, 6E side. It is provided at the end 25b.

  In the third invention of the present application, in the crane device with an extension jib according to the first or second invention, the extension jib 5 has a base end 5c swingable to a distal end 3b of the telescopic boom 3. On the other hand, on the side of the tip jib structure 5F located at the tip 5d, a support portion 36 to which the tension means 8 is connected is provided in a protruding state toward the jib back surface 5b, and the support portion 36 is provided on the jib axis L1. It is characterized in that it can be stored closer.

  In the fourth invention of the present application, in the crane device with an extension jib according to the first or second invention, the extension jib 6 fixes its base end 6c to the distal end 3b of the telescopic boom 3, A support portion 36 that supports the back side sheave 23 is provided on the side of the tip jib structure 6E located at the tip 6d so as to protrude toward the jib back surface 6b, and the support portion 36 is stored near the jib axis L1. It is characterized by being configured to be possible.

  According to a fifth invention of the present application, in the crane device with an extension jib according to the third or fourth invention, the support member 36 is pivotally supported on the tip jib structure 5E, 6E side. It is characterized in that it is provided at the rocking end 43b.

  In the present invention, the following effects can be obtained.

  (A) According to the crane device with an extension jib according to the first invention of the present application, the tip end of the tip jib constituting body 5F, 6E located on the tip side of the extension jib 5, 6 has a jib abdominal surface 5a, The tip sheave 26 is mounted in a state of protruding toward the 6a side, and the tip sheave 26 is configured to be retractable toward the jib axis L1, so that the tip jib constituting bodies 5F and 6E are mounted on the loading platform of the vehicle, and When carrying this, the tip sheave 26 attached in a protruding state toward the jib abdominal surfaces 5a and 6a is stored near the jib axis L1, so that the tip jib constituents 5F and 6E are loaded and unloaded on the loading platform of the vehicle. At this time, the tip sheave 26 portion does not get in the way, and the tip jib components 5F and 6E can be easily and quickly loaded and unloaded, improving the loading and unloading workability, and loading on the loading platform. When the tip sheave 26 is stored closer to the jib axis L1, the overall height is lower than when the tip sheave 26 protrudes toward the jib abdominal surfaces 5a and 6a, so that it is stable during transportation. And safety will be improved.

  (B) According to the crane device with an extension jib according to the second invention of the present application, in addition to the effect described in (a) above, the following specific effect is obtained. That is, according to the present invention, the tip sheave 26 is provided at the swing end 25b of the swing member 25 pivotally supported on the tip jib structure 5F, 6E side, so that the swing member 25 is simply provided. In addition, the tip sheave 26 can be stored and extended with an inexpensive configuration, and as a result, the structure of the crane device can be simplified and the cost can be reduced.

  (C) According to the crane device with an extension jib according to the third invention of the present application, in addition to the effect described in the above (a) or (b), the following specific effect is obtained. That is, according to the present invention, the extension jib 5 has its base end 5c slidably connected to the distal end 3b of the telescopic boom 3, while the distal end jib constituting body 5F located at the distal end 5d is tensioned. The support portion 36 to which the means 8 is connected is provided in a protruding state toward the jib back surface 5b side, and the support portion 36 is configured to be retractable toward the jib axis L1, so that the front end jib structure 5F is mounted on the vehicle. When mounting on the platform and transporting it, the front end jib structure 5F is placed on the platform of the vehicle by storing the supporting portion 36 attached in a protruding state toward the jib rear surface 5b near the jib axis L1. In the case where the support portion 36 does not get in the way when being loaded and unloaded, and the support portion 36 protrudes toward the jib abdomen surfaces 5a and 6a when the tip jib structure 5F is loaded on the loading platform. As a result, the front end jib configuration has a synergistic effect with the fact that the front end sheave 26 attached in a protruding state toward the jib abdominal surface 5a can be stored closer to the jib axis L1. The loading / unloading workability of the body 5F on the vehicle carrier and the safety during transportation are further improved.

  (D) According to the crane device with an extension jib according to the fourth invention of the present application, in addition to the effects described in the above (a) or (b), the following specific effects can be obtained. That is, in the present invention, the extension jib 6 fixes the base end 6c to the distal end 3b of the telescopic boom 3, while the rear side sheave 23 is located on the distal end jib construction body 6E located at the distal end 6d. The support portion 36 to be supported is provided so as to protrude toward the jib back surface 6b side, and the support portion 36 is configured to be retractable toward the jib axis L1, so that the tip jib structure 6E is placed on the loading platform of the vehicle. When mounted and transported, the front end jib structure 6E is unloaded on the loading platform of the vehicle by storing the supporting portion 36 attached in a protruding state toward the jib back surface 6b near the jib axis L1. In this case, the support portion 36 does not get in the way, and when the tip jib structure 6E is loaded on the loading platform, the overall height is higher than the case where the support portion 36 protrudes toward the jib abdomen surface 6a. Low As a result, as a synergistic effect that the tip sheave 26 attached in a protruding state to the jib abdominal surface 6a side can be stored near the jib axis L1, the tip jib structure 6E is transported. The unloading workability on the vehicle carrier and the safety during transportation are further improved.

  (E) According to the crane device with an extension jib according to the fifth invention of the present application, in addition to the effects described in the above (c) or (d), the following specific effects can be obtained. In other words, in the present invention, the support portion 36 is provided at the swing end 43b of the swing member 43 pivotally supported on the tip jib structure 5F, 6E side, so that the swing member 43 is simply provided. In addition, the support portion 36 can be stored and extended with an inexpensive configuration, and as a result, the structure of the crane device can be simplified and the cost can be reduced.

  Hereinafter, the present invention will be specifically described based on preferred embodiments.

A: 1st Embodiment (refer FIGS. 1-4)
In FIG. 1, the crane apparatus Z1 with an extension jib which concerns on 1st Embodiment of this invention is shown. This crane device Z1 is a luffing jib type crane device, and is a telescopic boom type crane vehicle X in which a base end 3a of a telescopic boom 3 is connected to a swivel 2 mounted on the vehicle 1 so as to freely pivot. And an extension jib 5 in which the base end portion 5c is connected to the tip 3b of the telescopic boom 3 of the crane vehicle X so as to be raised and lowered. The extension jib 5 includes six jib constituents, that is, a base end jib constituent 5A located on the base end side, a tip end jib constituent 5F located on the tip end side, and these base end jib constituents. The four jib structures 5B to 5E are sequentially connected between 5A and the tip jib structure 5F.

  The extension jib 5 connects the posts 7A and 7B provided upright at the distal end portion 5d and the proximal end portion 5c via the tension rod 9, the tension wire 10, and the tension rod 11, and is connected to one end of the tension rod 11. The connected jib support wire 12 is lifted up and wound up on the crane vehicle X side. Further, the hook block 14 is suspended from the distal end portion 5d by the work wire 13 drawn from the crane vehicle X to the distal end portion 5d of the extension jib 5, and the workpiece W is suspended by using the hook block 14. Work is to be done. The tension rod 9, the tension wire 10, the tension rod 11 and the jib support wire 12 constitute a “tension means 8”.

  By the way, this crane apparatus Z1 is mainly used for work such as installing a heavy work W on a very high structure B as shown in FIG. Although a radius is not required, it is required to be able to suspend a high load and a large load. Therefore, in this crane apparatus Z1, as shown in FIG. 1, the telescopic boom 3 and the extension jib 5 of the crane vehicle X are used in a state where both are set at a high elevation angle.

  On the other hand, in the above-mentioned extension jib 5, the shorter the axial length (in other words, the shorter the buckling length and the bending length) and the smaller the bending force applied to the extension jib 5 (in other words, For example, the force acting on the additional jib 5 is more effective as an axial force on the additional jib 5), which is advantageous in terms of strength performance. Further, since the extension jib 5 performs a suspension operation at a high head, the extension jib 5 and the workpiece W interfere with each other at a position near the distal end portion 5d of the extension jib 5. In order to avoid this, it is necessary to ensure a working radius that is greater than or equal to a predetermined value (ie, a pocket size that is greater than or equal to a predetermined value).

  In order to respond to such a demand, in this embodiment, as shown in FIGS. 1 and 2, the hanging position of the hook block 14, that is, the arrangement position of the sheave shaft 33 that supports the tip sheave 26 is generally set. In addition to securing the required pocket size by setting it at a position protruding by a predetermined dimension toward the jib abdomen surface 5a side of the extension jib 5 instead of on the jib axis L1 of the extension jib 5 which is a typical setting method, The axial length is shortened. Further, a support shaft 36 to which the jib axis L1 of the extension jib 5, the load line L3 extending in the vertical direction through the center of the hook block 14, and the tension rod 9 positioned at the tip of the tension means 8 are connected. The sheave shaft 33 and the sheave shaft 33 so that the three of the tension direction lines L2 extending in the axial direction of the tension means 8 pass through (corresponding to the “support portion 36” in the claims) at one point “P”. The position of the support shaft 36 with respect to the jib axis L1 is set, whereby the resultant force of the load due to the weight of the workpiece W acting in the direction of the jib axis L1 and the tension acting in the direction of the tension direction L2 Is aligned with the jib axis L1, and the resultant force acts on the jib 5 as an axial force.

  However, with this setting, as shown in FIG. 2, in the tip jib structure 5F, the tip sheave 26 portion protrudes on the jib abdomen surface 5a side, and the support on the jib back surface 5b side. The portion 36 and the back side sheave 23 portion supported by the support portion 36 protrude. For this reason, when the extension jib 5 is disassembled into the tip jib components 5A to 5F and the tip jib component 5F is transported by the vehicle, the jib abdomen 5a faces downward and the jib When the axis L1 is placed on the loading platform of the vehicle in a substantially horizontal state, the tip sheave 26 portion protrudes downward from the jib abdomen surface 5a. The workability deteriorates, for example, the 26 part interferes with the loading platform side and takes a long time for loading work. Further, in order to place the tip sheave 26 portion on the loading platform so as not to interfere with the loading platform, a high loading table must be installed on the lower side of the distal end jib structure 5F. The ground height of the tip jib structure 5F increases and the center of gravity of the tip jib structure 5F also increases, which is not preferable in terms of safety during transportation.

  Considering such circumstances, in this embodiment, the tip sheave 26 portion is configured to be retractable. Hereinafter, this storage structure will be described with reference to FIGS.

  The distal end jib structure 5F is a lattice structure having a rectangular cross-sectional shape, and the distal end portion 5Fa on the jib back surface 5b side is configured to recede to the proximal side from the distal end portion 5Fb on the jib abdominal surface 5a side. ing. The tip portion 5Fa on the jib back surface 5b side and the tip portion 5Fb on the jib belly surface 5a side include a first member 21 and a second member 22, and a top 20a of which protrudes toward the jib back surface 5b. Is fixed. The back side sheave 23 is attached to the top 20 a of the support base 20 via a support shaft 36, and one end of a tension rod 9 constituting the tension means 8 is connected.

  On the other hand, the distal end 5Fb of the distal end jib constituting body 5F on the jib abdominal surface 5a side is in a direction in which the base end portion 25a of the swing member 25 having a predetermined length is brought into contact with and separated from the jib axis L1 via the pivot shaft 27. It is mounted so that it can swing. The tip sheave 26 is attached to the tip portion 25b of the swing member 25 via the sheave shaft 33, and the wire end stopper 35 and the sheave 24 are attached to each intermediate position.

  Further, a connecting link 30 having a pair of links 31 and 32 is provided between the sheave shaft 33 attached to the tip 25b of the swing member 25 and the support shaft 36 attached to the top of the support base 20. Has been placed.

  In the state where the swing member 25 swings and protrudes toward the jib abdomen surface 5a side of the tip jib structure 5F, the links 31, 32 of the connection link 30 extend linearly and the swing member 25 is extended. Is restricted from projecting to the jib abdominal surface 5a side. In this restricted state, the hanging work using the hook block 14 is performed.

  On the other hand, when an external force is applied to the swing member 25 in a direction to swing it toward the jib axis L1, the links 31 and 32 of the connecting link 30 bend and the swing member 25 As shown in FIG. 4, the swing member 25 swings to a position slightly closer to the jib axis L1 than the extended surface of the jib abdomen surface 5a of the tip jib structure 5F. At this time, the distal end portion of the stopper 28 provided on the swing member 25 side abuts on the stopper receiver 29 provided on the support base 20 side, thereby further restricting the swing, and fixing not shown. Fixed by pins.

  By configuring the tip jib structure 5F as described above, the work of transporting the tip jib structure 5F can be performed simply, quickly and safely.

  That is, when transporting the extended jib 5, the extended jib 5 is disassembled into the respective jib constituting bodies 5A to 5F. And when conveying the said front-end | tip jib structure 5F, as shown in FIG. 4, this front-end jib structure 5F is suspended by the appropriate number of suspension wires 71, 72, 73 on the ground side, In this state, a movable support base 34 is mounted in advance on the sheave shaft 33 that supports the tip sheave 26. When the movable support base 34 is mounted, the swing member 25 is in an overhanging state shown in FIG.

  Thereafter, when the distal end jib structure 5F is lowered together with the movable support base 34 and the movable support base 34 is grounded, the movable member 25 is moved to the movable member 25 by the descending force of the distal end jib structure 5F and the like. A force for swinging it upward (that is, toward the jib axis L 1) is applied via the support base 34, and gradually swings upward so that the stopper 28 comes into contact with the stopper receiver 29. Here, the rocking member 25 is fixed to the support base 20 side by a fixing pin. Therefore, in this fixed state, the rocking member 25 portion is stored in a position above the jib abdomen surface 5a of the tip jib structure 5F.

  Next, the tip jib structure 5F is again suspended by the appropriate number of suspension wires 71, 72, 73 and moved onto the loading platform of the transporting vehicle, and the movable support platform 34 portion attaches it to the loading platform. On the mounting table G1, the main body portion of the tip jib structure 5F is mounted on the mounting table G2, respectively. In addition, when lowering the tip jib structure 5F from the loading platform of the vehicle, the work is performed in the reverse procedure to the above-described procedure.

  As described above, in this embodiment, when the tip jib structure 5F is loaded onto the vehicle loading platform, the rocking member 25 is stored above the jib abdomen surface 5a. Even if the support base 34 protrudes downward from the jib abdominal surface 5a, the protrusion amount is small as compared with the case where the swinging member 25 is in an overhanging state (see the state of FIG. 2). It is possible to prevent the rocking member 25 from interfering with the loading platform as much as possible during the loading / unloading operation of the jib structure 5F onto the loading platform, and the loading / unloading operation can be performed safely and simply. Will be significantly improved.

  Further, in the state where the tip jib structure 5F is placed on the loading platform, the rocking member 25 portion is stored above the jib belly surface 5a. The height of the mounting table G2 can be kept low as compared with the case where the mounting table G2 is placed while protruding downward from 5a. This means that the overall height in the state where the tip jib structure 5F is placed on the vehicle bed can be kept low, and the stability during transportation by vehicle travel is improved by the amount that the overall height is low, Safer transportation work is realized.

B: Second embodiment (see FIGS. 5 to 7)
In FIG. 5, the crane apparatus Z2 with an extension jib which concerns on 2nd Embodiment of this invention is shown. This crane device Z2 is a luffing jib type crane device similar to the crane device Z1 according to the first embodiment, and has the same basic configuration as the crane device Z1, except that the support portion It is the structure of 36 side. That is, in the crane apparatus Z1 according to the first embodiment, the swing member 25 side has a structure that can be stored, whereas the support portion 36 side has a fixed structure. This can be stored not only on the swing member 25 side but also on the support portion 36 side, thereby further reducing the overall height dimension of the tip jib structure 5F in the transport state, thereby improving stability and safety during transport. This is a further improvement. Hereinafter, a specific structure on the support portion 36 side will be described with reference to FIGS.

  The tip jib structure 5F in this embodiment is a lattice structure having a rectangular cross-sectional shape, and the tip portion 5Fa on the jib back surface 5b side and the tip portion 5Fb on the jib belly surface 5a side are at substantially the same position in the jib axis direction. It is configured to be located. Then, a triangular support base 40 having a first member 41 and a second member 42 and having a top portion 40a positioned in the vicinity of the jib axis L1 is fixed to each of the tip portions 5Fa and 5Fb. ing.

  The top 40a of the support 40 is provided with a link 45 and a link 46, and is provided with one end of a first connecting link 44 that can be extended to the jib abdomen surface 5a side, a link 48 and a link 49, and can be extended to the jib back surface 5b side. One end of each second connection link 47 is connected.

  The other end of the first connection link 44 is connected to the distal end portion 25b of the swing member 25 whose base end portion 25a is pivotally supported by the pivot shaft 27 on the distal end portion 5Fb. Due to the bending and unfolding of the connecting link 44, the swing member 25 and the tip sheave 26 provided at the tip portion 25b thereof protrude outward from the jib abdomen surface 5a (in the direction away from the jib axis L1). The posture stored inward (in the direction approaching the jib axis L1) from the jib abdominal surface 5a can be taken selectively.

  On the other hand, the base end portion 43a of the swinging member 43 is pivotally attached to the distal end portion 5Fa of the distal end jib structure 5F by a pivot shaft 50. A tip side 43b of the swinging member 43 is attached to the back side sheave 23 via a support shaft 36 (corresponding to “supporting portion 36” in claims), and a tension rod 9 constituting the tension means 8. Are connected at one end. The other end of the second connecting link 47 is connected to the tip 43b of the swing member 43, and the tension rod 9 is in tension (that is, the operating state of the extension jib 5). 6), the second connecting link 47 is expanded by receiving the tension, and the swinging member 43 has the tip 43b outside the jib back surface 5b (in a direction away from the jib axis L1), as shown in FIG. ).

  On the other hand, in the state where the tension rod 9 is not tensioned (that is, the non-operating state of the extension jib 5), the second connecting link 47 is bent as shown in FIG. The swinging member 43 is set to a posture in which the tip end portion 43b is stored inward (in a direction approaching the jib axis L1) from the jib back surface 5b.

By configuring as described above, as shown in FIG. 7, the extension jib 5 is disassembled into the respective jib constituting bodies 5A to 5F, and the tip end jib constituting body 5F is placed on the loading platform of the vehicle and transported. In this case, the swing member 25 portion is stored closer to the inner side than the jib abdomen surface 5a due to the bending of the first connecting link 44, and the swing member 43 portion is closer to the jib axis L1 than the jib back surface 5b. Therefore, the total height in the transport state in which the tip jib structure 5F is placed on the loading platform is further stored than the case of the first embodiment because the portion of the swinging member 43 is stored. As a result, further improvement in stability and safety during transportation can be expected.

  In addition, since all the structural members other than those described above and their operations and the like are the same as those in the first embodiment, each of the structural members in FIGS. 5 to 7 according to the second embodiment includes the first embodiment. The same reference numerals are assigned to the components shown in FIGS. 1 to 4 of the embodiment, and the corresponding description in the first embodiment is used to omit the description here.

C: Third embodiment (see FIGS. 8 and 9)
In FIG. 8, the crane apparatus Z3 with an extension jib which concerns on 3rd Embodiment of this invention is shown. The crane device Z3 is a fixed jib type crane device that is pivotally mounted on the vehicle 1 whereas the crane device Z1 according to the first embodiment is a luffing jib type crane device. A telescopic boom type crane vehicle X in which the base end 3a of the telescopic boom 3 is connected to the swivel base 2 so that it can be raised and lowered. It is configured with a fixedly connected extension jib 6. The extension jib 6 has five jib constituents, namely, a base end jib constituent 6A which is located on the base end side and is fixedly connected to the tip of the telescopic boom 3, and a tip end jib located on the front end side. The structure 6E is composed of three jib structures 6B to 6D that are sequentially added between the base end jib structure 6A and the distal end jib structure 6E.

  In the crane apparatus Z3 provided with the extension jib 6, as shown in FIG. 8, the work wire 13 drawn from the crane vehicle X to the tip 6d of the extension jib 6 is hooked from the tip 6d. The block 14 is suspended and the work W is loaded using the hook block 14. Further, as shown in FIG. 8, the crane device Z3 is mainly used for work such as installing a heavy work W on a structure B having a very high height. Although not required, since it is required to be able to suspend a large load with a high head, the telescopic boom 3 and the extension jib 5 of the integrated crane vehicle X are set at a high elevation angle. Used in state.

  And both the crane apparatus Z3 of this embodiment and the crane apparatus Z1 of the said 1st Embodiment disassemble the extension jib 5 and 6 with which this is equipped to each jib structure, and the front-end jib structure 5F, The problem in transporting 6E, that is, the workability when loading and unloading the tip jib structure 6E on the vehicle bed, the safety during transportation by vehicle travel, and the like can be improved.

  Thus, the extension jib 6 in this embodiment has a fixed jib structure, whereas the extension jib 5 in the first embodiment has a luffing jib structure, both of which are called jib usage forms. Although there is a difference in the point, the technical problem of improving the problem relating to the transportation of the tip jib structure 6E is the same.

  Accordingly, as shown in FIG. 9, the structure of the tip jib structure 6E in the crane device Z3 of this embodiment is that the extension jib 6 is a fixed jib type crane device. Except that the tension means 8 provided in the crane device Z1 is not provided, it is the same as the tip jib structure 5F of the crane device Z1 of the first embodiment.

  Hereinafter, the structure and operation effect of the tip jib structure 6E of the extension jib 6 will be described with reference to FIG. 9, and the corresponding description in the first embodiment will be used for other structures and operation effects.

  The distal end jib structure 6E is a lattice structure having a rectangular cross-sectional shape, and the distal end portion 6Ea on the jib back surface 6b side is configured to recede to the proximal end side from the distal end portion 6Eb on the jib abdomen surface 6a side. ing. The tip portion 6Ea on the jib back surface 6b side and the tip portion 6Eb on the jib belly surface 6a side are provided with a first member 21 and a second member 22, and a top 20a of which protrudes toward the jib back surface 6b. Is fixed. And the back side sheave 23 is attached to the top part 20a of the said support stand 20 via the spindle 36 (it corresponds to the "support part 36" in a claim).

  On the other hand, the distal end 6Eb of the distal end jib structure 6E on the jib abdominal surface 6a side is in a direction in which the base end portion 25a of the swing member 25 having a predetermined length is brought into contact with and separated from the jib axis L1 via the pivot shaft 27. It is mounted so that it can swing. The tip sheave 26 is attached to the tip portion 25b of the swing member 25 via the sheave shaft 33, and the wire end stopper 35 and the sheave 24 are attached to each intermediate position.

  Further, a connecting link 30 having a pair of links 31 and 32 is provided between the sheave shaft 33 attached to the tip 25b of the swing member 25 and the support shaft 36 attached to the top of the support base 20. Has been placed.

  When the swing member 25 swings and protrudes toward the jib abdomen surface 6a of the tip jib structure 6E, the links 31 and 32 of the connecting link 30 extend linearly to extend the swing member 25. Is restricted from protruding to the jib abdominal surface 6a side. In this restricted state, the hanging work using the hook block 14 is performed.

  On the other hand, when an external force is applied to the swing member 25 in a direction to swing it toward the jib axis L1, the links 31 and 32 of the connecting link 30 bend and the swing member 25 As shown in the chain line, the swing member 25 swings to a position slightly closer to the jib axis L1 than the extended surface of the jib abdomen surface 6a of the tip jib structure 6E. At this time, the distal end portion of the stopper 28 provided on the swing member 25 side abuts on the stopper receiver 29 provided on the support base 20 side, thereby further restricting the swing, and fixing not shown. Fixed by pins.

  The crane device according to the first embodiment is configured such that the distal end jib structure 6E can be retracted in this manner so that the transportation work of the distal end jib structure 6E can be performed easily, quickly and safely. As described for Z1.

D: Fourth embodiment (see FIGS. 10 to 11)
In FIG. 10, the crane apparatus Z4 with an extension jib which concerns on 4th Embodiment of this invention is shown. This crane device Z4 is a fixed jib type crane device similar to the crane device Z3 according to the third embodiment, and has the same basic configuration as the crane device Z3, and the difference is that the support device This is the structure on the part 36 side. That is, in the crane device Z3 according to the third embodiment, the swing member 25 side has a structure that can be stored, whereas the support portion 36 side has a fixed structure. Not only the swinging member 25 side but also the support portion 36 side can be stored, thereby further reducing the overall height dimension of the tip jib structure 6E in the transport state, thereby improving the stability and safety during transport. This is a further improvement. Hereinafter, a specific structure on the support portion 36 side will be described with reference to FIG.

  The tip jib structure 6E in this embodiment is a lattice structure having a rectangular cross-sectional shape, and the tip portion 6Ea on the jib back surface 6b side and the tip portion 6Eb on the jib belly surface 6a side are at substantially the same position in the jib axis direction. It is configured to be located. Then, a triangular support base 40 that is provided with a first member 41 and a second member 42 and whose top portion 40a is positioned in the vicinity of the jib axis L1 is fixed to each of the tip portions 6Ea and 6Eb. ing.

  The top 40a of the support base 40 is provided with a link 45 and a link 46, and is provided with one end of a first connecting link 44 that can be extended to the jib abdomen 6a side, a link 48 and a link 49, and can be extended to the jib back surface 6b. One end of each second connection link 47 is connected.

  The other end of the first connection link 44 is connected to the distal end portion 25b of the swinging member 25 whose base end portion 25a is pivotally supported by the pivot shaft 27 on the distal end portion 6Eb. Due to the bending and unfolding of the connecting link 44, the swing member 25 and the tip sheave 26 provided at the tip portion 25b thereof project outward from the jib abdomen surface 6a (in the direction away from the jib axis L1). Then, the posture stored inward (direction approaching the jib axis L1) from the jib abdominal surface 6a can be taken selectively.

  On the other hand, the proximal end portion 43a of the swing member 43 is pivotally attached to the distal end portion 6Ea of the distal end jib structure 6E by the pivot shaft 50. The back side sheave 23 is attached to the tip end portion 43b of the swing member 43 via a support shaft 36 (corresponding to “supporting portion 36” in claims). The other end of the second connecting link 47 is connected to the distal end portion 43b of the swinging member 43. When the second connecting link 47 is in the deployed state, the swinging member 43 has its tip end portion. 43b is set in a posture that protrudes outward from the jib back surface 6b (in a direction away from the jib axis L1).

  On the other hand, by bending the second connecting link 47, the swinging member 43 has a position in which the tip end portion 43b is stored inward (in a direction approaching the jib axis L1) from the jib back surface 6b. Is set.

By constructing as described above, when the extension jib 6 is disassembled into the respective jib constituent bodies 6A to 6E and the tip end jib constituent body 6E is placed on the loading platform of the vehicle and transported, the swing member Since the 43 portion is stored closer to the jib axis L1 than the jib back surface 6b, the total height in the transported state in which the tip jib constituting body 6E is placed on the loading platform is as much as the swing member 43 portion is stored. As a result, the stability and safety during transportation can be further improved.

Since all components and its operation or the like other than the above is the same as that of the second embodiment, by aid of appropriate description of the second embodiment, the description thereof is omitted.

It is a general view of the crane apparatus with an extension jib which concerns on 1st Embodiment of this invention. It is an enlarged view of the II part of FIG. It is the III-III arrow line view of FIG. It is the mounting state explanatory drawing at the time of conveyance of the front-end | tip jib structure of the crane apparatus shown in FIG. It is a general view of the crane apparatus with an extension jib which concerns on 2nd Embodiment of this invention. It is an enlarged view of VI part of FIG. It is a mounting state explanatory drawing at the time of conveyance of the front-end | tip jib structure of the crane apparatus shown in FIG. It is a general view of the crane apparatus with an extension jib which concerns on 3rd Embodiment of this invention. It is an enlarged view of the IX part of FIG. It is a general view of the crane apparatus with an extension jib which concerns on 4th Embodiment of this invention. It is an enlarged view of the XI part of FIG.

Explanation of symbols

1 .. Vehicle 2 .. Swivel 3 .. Telescopic boom 4 .. Jib mounting base 5 .. Extension jib 6 .. Extension jib 7A .. Post 7B .. Post 8 .. Tensioning means 9. Rod 10 ·· Tension wire 11 · · Tension rod 12 · · Jib support wire 13 · · Work wire 14 · · Hook block 20 · · Support base 21 · · First member 22 · · Second member 23 · · Back Side sheave 24 .. Sheave 25 .. Oscillating member 26 .. Tip sheave 27 .. Pivot shaft 28 .. Stopper 29 .. Stopper receiver 30 .. Link 31 31 Link 32 Link 33 Sheave shaft 34 .. Movable support base 35 .. Wire end stopper 36.. Support shaft (support part)
······································································································ 47 ..Link 50 ..Pivot shaft 71 ..Hanging wire 72 ..Hanging wire 73 ..Hanging wire G1 ..Mounting table G2 ..Mounting table W ..Work B ..Structure L1 ..Jib axis L2・ Tension direction line L3 ・ ・ Load line X ・ ・ Extension boom type crane vehicle Z1 ・ ・ Crane device with extension jib Z2 ・ ・ Crane device with extension jib Z3 ・ ・ Crane device with extension jib Z4 ・ ・ Additional jib Crane equipment

Claims (5)

An extension jib constructed by sequentially adding a plurality of jib structures (5A to 5F) and (6A to 6E) in the axial direction to the tip (3b) of the telescopic boom (3) provided in the crane vehicle (X). (5) A crane device with an extension jib to which (6) is attached,
The tip sheave (5a) and the tip sheave (5a) are projected toward the tip of the tip jib structure (5F) and (6E) located on the tip of the extension jib (5) and (6). 26) A crane device with an extension jib characterized in that the tip sheave (26) can be stored closer to the jib axis (L1) while being attached. In claim 1,
The tip sheave (26) is provided at a swing end (25b) of a swing member (25) pivotally supported on the tip jib structure (5F), (6E) side. Crane equipment with additional jib. In claim 1 or 2,
The extension jib (5) has a proximal end (5c) pivotably connected to a distal end (3b) of the telescopic boom (3), while the distal end jib structure located at the distal end (5d). On the (5F) side, a support portion (36) to which the tension means (8) is connected is provided in a protruding state toward the jib back surface (5b) side, and the support portion (36) is closer to the jib axis (L1). A crane device with an extension jib characterized by being configured to be retractable. In claim 1 or 2,
While the base end (6c) of the extension jib (6) is fixed to the distal end (3b) of the telescopic boom (3), the distal end jib structure (6E) side located at the distal end (6d) Is provided with a support portion (36) for supporting the back side sheave (23) so as to protrude toward the jib back surface (6b), and the support portion (36) can be stored closer to the jib axis (L1). The crane apparatus with the extension jib characterized by being comprised. In claim 3 or 4,
The support portion (36) is provided at a swing end (43b) of a swing member (43) pivotally supported on the tip jib structure (5F), (6E) side. Crane equipment with additional jib.