JP5454308B2 - crane - Google Patents

Description

  The present invention relates to a crane having a backstop attached to a undulation member.

  For example, as described in Patent Documents 1 and 2, a crane including a backstop that prevents a hoisting member (boom or mast) from falling backward is known. The backstop includes a backstop main pillar and a support (for example, a stay for supporting the main pillar). The lower end of the backstop main pillar is received by a bracket.

  In such a crane, a plurality of working postures are set. Specifically, the undulating member is set at a plurality of angles. For example, in the case of a counterbalance type crane in which a counterweight is suspended from the mast, the mast setting angle is changed according to the mass of the suspended load suspended by the boom and the boom working radius. That is, when raising the lifting capacity of the crane, the mast is tilted to the rear side of the crane, and the distance between the counterweight and the main body (the upper swing body and the lower traveling body) is increased. Thereby, it is suppressed that a crane falls to the crane front (suspended load side).

  When the mast angle is changed as described above, the backstop main pillar attached to the mast also rotates. Therefore, by changing the length of the support, the angle between the backstop main pillar and the undulating member is changed, and the length of the backstop main pillar is changed. In this way, the lower end of the backstop main pillar is aligned with the bracket position.

  Further, the angle between the backstop main pillar attached to the boom and the boom may be changed, and the length of the backstop main pillar may be changed. This changes the boom angle setting (the angle at which the boom can be raised).

JP 2007-290790 A Japanese Patent No. 4335554

  However, when the angle between the backstop main column and the undulating member is changed, that is, when the length of the support is changed, there is the following problem.

  When the crane is in a working posture (see the posture shown in FIG. 1), the support is located at a high place. Therefore, the work of changing the length of the support manually is a difficult and dangerous work. Moreover, even when the length of the support is changed using an auxiliary crane, it is difficult and time-consuming.

  Also, especially when changing the length of the support attached to the mast, there are the following problems. When the crane is in the working posture, the mast is loaded in a direction that tends to fall backward, so a large load is applied to the support. Therefore, the length of the support cannot be changed with the working posture. Therefore, it is necessary to change the length of the support by making the mast forward leaning position, but it takes time and effort to make the mast forward leaning position.

  In particular, it takes time and effort to put the mast of a counterbalance crane into a forward tilted posture. Specifically, the guide line connecting the mast and the counterweight is once removed from the counterweight before the mast is tilted forward. And after fixing this guy line to a mast, a mast is made into a leaning posture. Since these operations involve work at a high place, an auxiliary crane may be required. Further, after changing the length of the support, it takes time and labor to return the mast to the original position and lift the counterweight.

  In addition, there is a method in which the length of the support is changed by incorporating a hydraulic cylinder into the support and extending or contracting the hydraulic cylinder. In this case, a hydraulic cylinder driving device and a control device are required. Therefore, the structure of the crane becomes complicated and expensive. Furthermore, when a hydraulic cylinder is used, it is difficult to ensure position setting accuracy. That is, it is not easy to adjust the length of the hydraulic cylinder so that the lower end of the backstop main column matches the position of the bracket.

  The objective of this invention is providing the crane which can change the angle setting of a raising / lowering member, without having to change the angle of a backstop main pillar and the raising / lowering member.

  In order to achieve the above object, the crane according to the present invention has the following characteristics, and includes the following characteristics alone or in combination as appropriate.

  The first feature of the crane is a hoisting member attached to the upper swing body, a backstop main column attached to the hoisting member, a support connecting the hoisting member and the backstop main column, and the upper swing A bracket that is attached to the body and receives a lower end of the backstop main column, and the bracket receives the lower end of the backstop main column at a plurality of positions so as to correspond to a plurality of angle settings of the undulating member. That is.

  In this crane, the bracket receives the lower end of the backstop main column at a plurality of positions so as to correspond to a plurality of angle settings of the hoisting member. Therefore, the angle setting of the hoisting member can be changed without having to change the angle between the backstop main column and the hoisting member. As a result, the angle setting of the undulating member can be changed safely and easily.

  Moreover, in this crane, since it is not necessary to change the angle of a backstop main pillar and the raising / lowering member, it is not necessary to change the length of a support. Therefore, a hydraulic cylinder for changing the length of the support is unnecessary. Further, the drive device and the control device for the hydraulic cylinder are unnecessary. Therefore, the structure of the crane can be simplified as compared with the case where the hydraulic cylinder is provided. As a result, the crane can be manufactured easily and inexpensively. Further, since the hydraulic cylinder is not necessary, the problem of ensuring the position setting accuracy of the hydraulic cylinder does not occur.

  The second feature is that the bracket includes a plurality of recessed standby portions for receiving the lower ends of the backstop main pillars.

  In this configuration, the bracket can have a simple structure. Therefore, the structure of the crane can be simplified.

  A third feature is that a guide is attached to the bracket, and the guide is provided along one of the plurality of standby units and closes the other standby unit adjacent to the one standby unit. It is formed as follows.

  In this crane, a guide is formed along one of the plurality of standby portions. Therefore, the lower end of the backstop main pillar can be easily arranged in one standby part.

  In addition, the guide is formed so as to block another standby unit adjacent to the one standby unit. Therefore, it can prevent that the lower end of a backstop main pillar is arrange | positioned at another waiting part.

  According to a fourth feature, each of the plurality of standby portions has a portion formed in an arc shape when viewed from the side (viewed from the left and right direction of the upper swing body) and receives a lower end of the backstop main column. A first standby part and a second standby part constituting the plurality of standby parts, the first standby part of the first standby part, and an inclined part extending outward from the concave part when viewed from the side. The indented part and the inclined part of the second standby part are adjacent to each other. When the guide is arranged so as to overlap the second standby portion when viewed from the side, a recess extension portion formed so as to extend the recess portion of the first standby portion to the outside of the recess, and the recess extension portion And a second closing portion formed so as to connect the hollow outer end portion of the hollow portion and the hollow outer end portion of the hollow portion of the second standby portion. Furthermore, when the guide is arranged so as to overlap the first standby part when viewed from the side, an inclined extension part formed to extend the inclined part of the second standby part to the outside of the depression, and the inclined extension And a first closing portion formed so as to connect a hollow outer end portion of the first portion and a hollow outer end portion of the inclined portion of the first standby portion.

In this crane, the guide includes the above-described depression extension. Therefore, when the guide is disposed so as to overlap the second standby portion when viewed from the side, the lower end of the backstop main pillar can be easily disposed on the first standby portion.
The guide includes a second closing part. Therefore, when it arrange | positions so that it may overlap with the said 2nd standby part seeing from the side, it can prevent that the lower end of a backstop main pillar arrange | positions in a 2nd standby part.

The guide also includes an inclined extension. Therefore, when the guide is disposed so as to overlap the first standby portion when viewed from the side, the lower end of the backstop main pillar can be easily disposed on the second standby portion.
The guide includes a first closing portion. Therefore, when the guide is disposed so as to overlap the first standby portion when viewed from the side, it is possible to prevent the lower end of the backstop main pillar from being disposed in the first standby portion.

  A fifth feature is that the bracket can be moved in at least one of the front-rear direction and the up-down direction so as to correspond to a plurality of angle settings of the hoisting member.

  In this crane, the bracket can be moved. Therefore, compared with the case where a bracket is fixed to an upper revolving body, the angle setting of the raising / lowering member which can respond can be made more various.

  Moreover, a person can get on the upper swing body to which the bracket is attached. Therefore, it is possible to easily move the bracket. Therefore, the angle setting of the undulating member can be easily changed.

  As described in the above description, the present invention particularly has a configuration in which the bracket receives the lower end of the backstop main column at a plurality of positions so as to correspond to a plurality of angle settings of the undulating member. Therefore, the angle setting of the hoisting member can be changed without having to change the angle between the backstop main column and the hoisting member.

1 is an overall view of a crane. It is the figure which looked at the bracket periphery shown in FIG. 1 from the side. FIG. 3 is a diagram corresponding to FIG. 2 of a modification of the first embodiment. FIG. 3 is a view corresponding to FIG. 2 illustrating a first state of the second embodiment. It is FIG. 2 equivalent view which shows the 2nd state of 2nd Embodiment. It is FIG. 2 equivalent view of the modification of 2nd Embodiment. It is FIG. 2 equivalent figure of 3rd Embodiment. It is FIG. 2 equivalent view of the modification of 3rd Embodiment.

  Hereinafter, an embodiment of a crane according to the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is an overall view of a crane. FIG. 2 is an enlarged view of the periphery of the bracket shown in FIG. 1, and is a view of the periphery of the bracket as viewed from the side. Hereinafter, the configuration of the crane 1 will be described in detail with reference to FIGS. 1 and 2.

  The crane 1 is a mobile crane. As shown in FIG. 1, the crane 1 mainly includes a lower traveling body 11, an upper swing body 15 attached to the upper side of the lower traveling body 11, a boom 21 (raising and lowering member) attached to the upper swing body 15, and A mast 51 (an undulating member). The boom back stop 30 is configured by the boom back stop main pillar 31 and the support 32 attached to the boom 21. A lower end 31 b of the boom back stop main pillar 31 is received by the bracket 40. The mast backstop main pillar 61 and the support 66 attached to the mast 51 constitute a mastback stop 60. A lower end 61 b of the mast backstop main pillar 61 is received by the bracket 70.

  The lower traveling body 11 is a portion that is used for traveling of the crane 1 and is, for example, a crawler traveling type (may be a wheel traveling type).

  The upper turning body 15 is a portion that turns with respect to the lower traveling body 11. The upper swing body 15 is attached to the upper side of the lower traveling body 11 via the swing bearing 12. Hereinafter, when referred to as “front-rear direction” and “left-right direction”, the upper swing body 15 is used as a reference. The upper swing body 15 includes a counterweight 17 attached to the rear end portion, a cab 16 attached to the front end portion, an engine, a hydraulic pump (not shown), and the like. A crane mast 18, a boom 21 and a mast 51 are attached to the upper swing body 15.

  The crane mast 18 is a box-shaped member that raises and lowers the mast 51, and is attached to the upper swing body 15. The crane mast 18 is raised and lowered by expanding and contracting a telescopic rope 19 that connects a drum (not shown) attached to the rear end of the upper swing body 15 and the tip of the crane mast 18. A backstop is not attached to the crane mast 18.

  The boom 21 (raising and lowering member) is a lattice structure member attached to the upper swing body 15. A hook 22 for suspending a suspended load is suspended from the tip of the boom 21. A base end portion of the boom 21 is attached to the front end portion of the upper swing body 15, and the boom 21 is raised and lowered around the base end portion. More specifically, the tip of the boom 21 and the tip of the mast 51 are connected by the guy line 23 (unwinding and unwinding) and the telescopic rope 24 (unwinding and unwinding), and the mast 51 is fixed. Unwind and wind the telescopic rope 24. As a result, the boom 21 is raised and lowered.

  The boom back stop 30 is a member that prevents the boom 21 from falling backward beyond a predetermined angle. The boom back stop 30 includes a boom back stop main pillar 31 and a support 32. Since the boom back stop 30 has the same configuration as a mast back stop 60 described later, only the outline will be described.

  The boom backstop main pillar 31 (backstop main pillar) is a rod-shaped member attached to the boom 21. The boom back stop main column 31 can absorb an axial impact by a spring (not shown).

  The support 32 is a member that connects the boom 21 and the boom back stop main column 31, and is a support stay for the boom back stop main column 31.

  The bracket 40 is a member that is attached to the upper swing body 15 and receives the lower end 31b of the boom back stop main pillar 31 and is also called a striker. Since the bracket 40 has the same configuration as a bracket 70 described later, only the outline will be described. The bracket 40 receives the lower end 31b of the boom back stop main pillar 31 at a plurality of positions so as to correspond to a plurality of angle settings of the boom 21. Further, the bracket 40 includes a plurality of recessed standby portions for receiving the lower end 31b of the boom backstop main pillar 31.

  The mast 51 (an undulating member) is a lattice structure member that is attached to the upper swing body 15. The mast 51 is a member that raises and lowers the boom 21 and is a member that suspends the counterweight 53. The mast 51 is disposed on the rear side of the boom 21 and on the upper side of the crane mast 18. A mast foot 51 f that is a base end portion of the mast 51 is attached to the upper swing body 15. The mast 51 undulates around the mast foot 51f. More specifically, the leading end of the crane mast 18 and the leading end of the mast 51 are connected by a guy line 25 (impossible to wind and unwind). To do. At this time, the mast backstop 60 also rotates around the mast foot 51f. A counterweight 53 is suspended from the tip of the mast 51.

  The counterweight 53 is a weight that suppresses the crane 1 from falling forward and improves the suspension capacity of the crane 1. The counterweight 53 is suspended from the tip of the mast 51 via a guy line 52 and is disposed on the rear side of the upper swing body 15. And the fall stability to the front side (suspended load side) of the crane 1 is adjusted according to the mass of the suspended load suspended by the boom 21 and the working radius. At this time, the mast 51 is raised and lowered, and the distance between the counterweight 53 and the upper swing body 15 is adjusted.

(Mast back stop)
The mast backstop main pillar 61 (backstop main pillar) is a member attached to the mast 51 and is a rod-like member that prevents the mast 51 from falling backward. The mast backstop main pillar 61 is provided as follows. It is arranged between the mast 51 and the upper swing body 15. A total of two masts 51 are arranged at each of the left and right ends of the mast 51 (FIG. 1 shows only one on the right side (front side in FIG. 1)). The upper end is attached to the mast 51 and fixed with a pin. The lower end 61 b is received by the bracket 70 attached to the upper swing body 15, but the lower end 61 b is not fixed to the bracket 70. Further, the angle between the axial direction of the mast backstop main pillar 61 and the axial direction of the mast 51 is constant (described later). And if the mast 51 undulates, it moves with the mast 51 (rotates around the mast foot 51f).

  As shown in FIG. 2, the mast backstop main column 61 includes an outer member 62 and an inner member 63 disposed inside the outer member 62. As the inner member 63 slides in the axial direction with respect to the outer member 62, the mast backstop main pillar 61 expands and contracts. Further, a pin hole 62p and a pin hole 63p are formed in each of the outer member 62 and the inner member 63, and the length of the mast backstop main pillar 61 is fixed by inserting a pin into these pin holes. In addition, if the apparatus which can expand-contract the mast backstop main pillar 61 easily, such as a screw-type expansion-contraction apparatus and a hydraulic cylinder, is provided, the change of the angle setting of the mast 51 becomes easier.

  As shown in FIG. 1, the support 66 is a member that connects the mast 51 and the mast backstop main pillar 61 and is a main pillar support stay. One end of the support 66 is fixed to the mast 51 with a pin, and the other end is fixed to the mast backstop main pillar 61 with a pin. Further, the support 66 does not expand and contract. As a result, the angle between the axial direction of the mast backstop main pillar 61 and the axial direction of the mast 51 is fixed.

(bracket)
The bracket 70 is a member attached to the upper surface of the upper swing body 15 in order to receive the lower end 61b of the mast backstop main column 61, and is also referred to as a striker. Moreover, the bracket 70 receives the lower end 61b of the mast backstop main pillar 61 at a plurality of positions so as to correspond to a plurality of angle settings of the mast 51. More specifically, the bracket 70 includes a plurality of recessed standby portions for receiving the lower end 61b of the mast backstop main pillar 61. This standby unit is provided in the same number as the number of angles of the mast 51 set. Specifically, as shown in FIG. 2, when the angle setting number of the mast 51 (see FIG. 1) is 2, the bracket 70 is formed on the first standby portion 71 formed on the front side and on the rear side. And a second standby unit 76.

  The first standby portion 71 is a hollow portion that receives the lower end 61 b of the mast backstop main pillar 61. The 1st waiting part 71 is provided with the 1st hollow part 72 formed in the back side, and the 1st inclination part 73 formed in the front side. In the following, the inner side of the dent (the back side of the dent, the lower side in FIG. 2) is referred to as “the inner side of the dent”, and the outer side of the dent (the front side of the dent, the upper side in FIG. 2) is referred to as “the outer side of the dent”.

  The first recess 72 is a portion that has a portion formed in an arc shape when viewed from the side (as viewed from the left-right direction of the upper swing body 15) and receives the lower end 61 b of the mast backstop main column 61. . In addition, the 1st hollow part 72 may have the part (for example, the linear part 72a extended upwards from the upper end of the circular arc part of the 1st hollow part 72) which is not formed in circular arc shape.

  The 1st inclination part 73 is a part extended from the 1st hollow part 72 to the hollow outer side seeing from the side. More specifically, it is a portion extending from the front end of the first depression 72 to the front side and the upper side (obliquely). By this first inclined portion 73, the lower end 61b of the mast backstop main pillar 61 can be slid into the inside of the dent (the first dent portion 72 side).

  The second standby portion 76 is a hollow portion that receives the lower end 61b of the mast backstop main pillar 61, and includes a second hollow portion 77 formed on the rear side, and a second inclined portion 78 formed on the front side. Is provided. A linear portion 77 a is formed in the second recess portion 77. Since the second standby unit 76 has the same shape as the first standby unit 71, a detailed description thereof will be omitted.

(Operation for changing the setting angle of the mast 51)
Next, the operation for changing the set angle of the mast 51 (see FIG. 1) will be described. Specifically, the operation when the mast 51 is raised forward will be described. First, the mast 51 (see FIG. 1) is raised forward from the state where the first standby portion 71 receives the lower end 61b of the mast backstop main pillar 61 (shown by the solid line in FIG. 2). Then, the mast backstop main pillar 61 moves upward. That is, the lower end 61b of the mast backstop main pillar 61 rotates around the mast foot 51f (see FIG. 1). Next, the mast backstop main pillar 61 is extended. That is, the pins are pulled out from the pin holes 62p and 63p, the inner member 63 is pulled out from the outer member 62, and the pins are inserted into the pin holes 62p and 63p. When the mast 51 is tilted backward, the lower end 61b of the mast backstop main pillar 61 is received by the second standby portion 76. Note that the work procedure can be changed as appropriate, such as removing the pins from the pin holes 62p and 63p before the mast 51 (see FIG. 1) is tilted forward. When the mast 51 is tilted backward, the work is performed in the reverse order.

  Further, as described above, the boom back stop 30 and the bracket 40 shown in FIG. 1 have the same configuration as the mast back stop 60 and the bracket 70. When the boom 21 is raised to a predetermined angle, the lower end 31b of the boom back stop main pillar 31 is received by the bracket 40. The predetermined angle can be changed by changing the length of the boom back stop main pillar 31.

(Characteristics of crane of this embodiment)
The crane 1 of this embodiment has the following characteristics.

As shown in FIG. 1, the bracket 70 receives the lower end 61 b of the mast backstop main pillar 61 at a plurality of positions so as to correspond to a plurality of angle settings of the mast 51. Therefore, the angle setting of the mast 51 can be changed without having to change the angle between the mast backstop main pillar 61 and the mast 51. As a result, the angle setting of the mast 51 can be changed safely and easily.
In particular, when changing the angle setting of the mast 51 with the counterweight 53 suspended, it takes time and effort to remove the guy line 52 connecting the mast 51 and the counterweight 53 from the counterweight 53 and to allow the mast 51 to fall forward. Such work is unnecessary.

  Further, since it is not necessary to change the angle between the mast backstop main pillar 61 and the mast 51, it is not necessary to change the length of the support 66. Therefore, a hydraulic cylinder for changing the length of the support 66 is not necessary. Further, the drive device and the control device for the hydraulic cylinder are unnecessary. Therefore, the structure of the crane 1 can be simplified as compared with the case where the hydraulic cylinder is provided. As a result, the crane 1 can be manufactured easily and inexpensively. Further, since the hydraulic cylinder is not necessary, the problem of ensuring the position setting accuracy of the hydraulic cylinder does not occur.

  Further, the bracket 70 includes a plurality of recessed standby parts (a first standby part 71 and a second standby part 76) for receiving the lower end 61b of the mast backstop main pillar 61 main pillar. Therefore, the bracket 70 can have a simple structure. Therefore, the structure of the crane 1 can be simplified.

(Modification of the first embodiment)
FIG. 3 shows the periphery of the bracket 170 according to a modification of the first embodiment. The bracket 70 (see FIG. 2) can be deformed so that the first standby part 71 and the second standby part 76 are arranged in the vertical direction.

  More specifically, as shown in FIG. 3, the bracket 170 includes a first standby portion 71 formed on the lower side and a second standby portion 76 formed on the upper side. In the first standby portion 71, the first recess 72 is disposed on the lower side and the first inclined portion 73 is disposed on the upper side. In the second standby portion 76, the second recess portion 77 is disposed on the lower side, and the second inclined portion 78 is disposed on the upper side. Thereby, when changing the setting angle of the mast 51 (refer FIG. 1), the expansion-contraction amount of the mast backstop main pillar 61 can be decreased compared with the said embodiment.

  In addition, arrangement | positioning with the 1st standby part 71 and the 2nd standby part 76 is not restricted to said arrangement | positioning. For example, they may be arranged in the vertical direction and the front-rear direction (oblique direction).

(Second Embodiment)
4 and 5 show the periphery of the bracket 270 according to the second embodiment. The second embodiment is different from the first embodiment (see FIGS. 2 and 3) in the structure of the bracket 270 and the point that the guide 80 is attached to the bracket 270. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  As shown in FIGS. 4 and 5, the bracket 270 is in a state in which the arrangement pitch of the first standby part 71 and the second standby part 76 in the front-rear direction is short and the shape of the standby part is incomplete. Specifically, the first depression 72 and the second inclined portion 78 are adjacent to each other. That is, compared with the 1st hollow part 72 (refer FIG. 2) which concerns on 1st Embodiment, the 1st hollow part 72 of this embodiment has a shallow hollow shape. Moreover, compared with the 2nd inclination part 78 which concerns on 1st Embodiment, the 2nd inclination part 78 of this embodiment has a short inclination. Accordingly, there may be a case where the lower end 61b of the mast backstop main pillar 61 cannot be received by the target standby portion (regular position) if it remains as it is.

  The guide 80 is a member attached to the bracket 270, and has both a function of guiding (sliding in) the lower end 61b of the mast backstop main column 61 to a target standby part and a function of closing a non-target standby part. As shown in FIG. 4, the guide 80 includes a first state arranged so as to overlap the second standby unit 76 as viewed from the side, and a first standby unit 71 as viewed from the side as shown in FIG. There are two states, the second state, which is arranged so as to overlap. Switching between these two states is performed by rotating the guide 80 as shown in FIGS. More specifically, the switching is performed by rotating the guide 80 in the front-rear direction around the central axis 80a near the rear end of the first recess 72 (near the front end of the second inclined portion 78). The above switching may be performed by detaching the guide 80 from the bracket 270. Further, one guide 80 is attached to each of the left and right sides of the bracket 270 (that is, only the right part of the bracket 270 is shown in FIGS. 4 and 5).

(First state)
First, the first state shown in FIG. 4 will be described. That is, the case where the guide 80 is disposed so as to overlap the second standby portion 76 when viewed from the side will be described. At this time, the guide 80 is along the first standby unit 71 (one standby unit) among the plurality of standby units and closes the second standby unit 76 (other standby units) adjacent to the first standby unit 71. Specifically, the guide 80 includes a hollow extension portion 82 and a second closing portion 86.

  The recess extension portion 82 is a portion that is formed along the first standby portion 71 and is a portion that is formed so as to extend the first recess portion 72 to the outside of the recess. Moreover, the hollow extension part 82 has a part formed in circular arc shape seeing from the side. In other words, the shape obtained by combining the hollow extension portion 82 and the first hollow portion 72 is the same shape as the first hollow portion 72 (see FIG. 2) of the first embodiment. Thereby, the lower end 61 b of the mast backstop main pillar 61 can be reliably received by the first standby portion 71. In addition, the hollow extension part 82 may have the linear part 82a similarly to the 1st hollow part 72 (refer FIG. 2) of 1st Embodiment.

  The second closing portion 86 is a portion that closes the second standby portion 76, and is a portion that is formed to connect the hollow outer end portion 82 e of the hollow extension portion 82 and the hollow outer end portion 77 e of the second hollow portion 77. is there. The second closing portion 86 is formed in a straight line, for example.

(Second state)
Next, the second state shown in FIG. 5 will be described. That is, the case where the guide 80 is disposed so as to overlap the first standby portion 71 when viewed from the side will be described. At this time, the guide 80 is along the second standby unit 76 (one standby unit) among the plurality of standby units and closes the first standby unit 71 (other standby units) adjacent to the second standby unit 76. Specifically, the guide 80 includes an inclined extension portion 88 and a first closing portion 81.

  The inclined extension portion 88 is a portion that is formed along the second standby portion 76, and is a portion that is formed so as to extend the second inclined portion 78 to the outside of the recess. The combined shape of the inclined extension portion 88 and the second inclined portion 78 is the same shape as the second inclined portion 78 (see FIG. 2) of the first embodiment. Thereby, the lower end 61b of the mast backstop main pillar 61 can be slid into the second standby portion.

  The first closing portion 81 is a portion that closes the first standby portion 71, and connects the hollow outer end portion 88 e of the inclined extension portion 88 and the hollow outer end portion 73 e of the first inclined portion 73 of the first standby portion 71. It is a part formed in. The first closing portion 81 is formed in a straight line, for example.

(Characteristics of crane of this embodiment)
The crane 1 of this embodiment has the following characteristics.

  As shown in FIG. 4, a guide 80 is formed along the first standby portion 71 among the plurality of standby portions. Therefore, the lower end 61 b of the mast backstop main pillar 61 can be easily arranged in the first standby portion 71. Further, as shown in FIG. 5, a guide 80 is formed along the second standby portion 76. Therefore, the lower end 61 b of the mast backstop main pillar 61 can be easily disposed in the second standby portion 76.

  Further, as shown in FIG. 4, the guide 80 is formed so as to block the second standby portion 76 adjacent to the first standby portion 71. Therefore, it is possible to prevent the lower end 61 b of the mast backstop main pillar 61 from being disposed in the second standby portion 76. Further, as shown in FIG. 5, the guide 80 is formed so as to block the first standby part 71 adjacent to the second standby part 76. Therefore, it is possible to prevent the lower end 61 b of the mast backstop main pillar 61 from being disposed in the first standby portion 71.

In the crane 1, the guide 80 includes a recess extension 82 as shown in FIG. 4. Therefore, when the guide 80 is disposed so as to overlap the second standby portion 76 when viewed from the side (first state), the lower end 61b of the mast backstop main pillar 61 can be easily disposed on the first standby portion 71.
The guide 80 includes a second closing part 86. Therefore, in the first state, it is possible to prevent the lower end 61b of the mast backstop main pillar 61 from being disposed on the second standby portion 76.

As shown in FIG. 5, the guide 80 includes an inclined extension 88. Therefore, when the guide 80 is disposed so as to overlap the first standby part 71 when viewed from the side (second state), the lower end 61b of the mast backstop main pillar 61 can be easily disposed on the second standby part 76.
The guide 80 includes a first closing part 81. Therefore, in the second state, it is possible to prevent the lower end 61b of the mast backstop main pillar 61 from being disposed on the first standby portion 71.

(Modification of the second embodiment)
FIGS. 6A and 6B show the periphery of a bracket 270A according to a modification of the second embodiment. FIG. 6A shows the first state, and FIG. 6B shows the second state. As shown in FIGS. 6A and 6B, the guide 80A may be attached to the inner side in the left-right direction of the bracket 270A.

  Further, the guide 80 is mounted on a bracket (see the bracket 170 in FIG. 3) in which a plurality of standby portions are arranged in the vertical direction or a bracket (not shown) in which the plurality of standby portions are arranged in the vertical and front-back directions (oblique direction). It may be attached.

(Third embodiment)
FIG. 7 shows the periphery of a bracket 370 according to the third embodiment. This embodiment is different from the first embodiment (see FIG. 2) in that the bracket 370 can be moved. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  As shown in FIG. 7, the bracket 370 can be moved in the front-rear direction so as to correspond to a plurality of angle settings of the mast 51 (see FIG. 1) (the transfer will be described later). Near the lower end of the bracket 370, a plurality of pin holes 370p are formed at intervals in the front-rear direction. In addition, the bracket 370 includes a first standby unit 71. On the other hand, the second standby unit 76 (see FIG. 2) shown in the first embodiment may be omitted.

  The bracket attachment portion 390 is a member that moves and fixes the bracket 370 to the upper swing body 15. The bracket attachment portion 390 is a linear member, and is fixed to the upper surface of the upper swing body 15 along the front-rear direction, and is disposed inside the bracket 370 in the left-right direction, for example. The bracket mounting portion 390 is formed with pin holes 390p having positions and numbers corresponding to the angle setting of the mast 51 (see FIG. 1).

  Next, the operation of the bracket 370 when changing the angle setting of the mast 51 (see FIG. 1) (when raising the mast 51 forward) will be described. First, as in the first embodiment, the mast 51 is raised to the front side. Next, the bracket 370 is moved rearward along the bracket attachment portion 390. More specifically, the bracket 370 is moved rearward along the bracket mounting portion 390 so that the first standby portion 71 is disposed at the position of the second standby portion 76 (see FIG. 2) in the first embodiment (slide). (Transfer to the position indicated by the two-dot chain line in FIG. 7). Note that the bracket 370 may be temporarily detached from the bracket mounting portion 390 and the bracket 370 may be moved. Next, the bracket 370 is fixed to the bracket mounting portion 390 by inserting a pin into the pin hole 370p and the pin hole 390p. Then, as in the first embodiment, the mast backstop main column 61 is extended, and the lower end 61 b of the mast backstop main column 61 is received by the first standby portion 71. When the mast 51 (see FIG. 1) is tilted backward, the work is performed in the reverse order.

(Characteristics of crane of this embodiment)
The crane 1 of this embodiment has the following characteristics.

  The bracket 370 can be moved in the front-rear direction so as to correspond to a plurality of angle settings of the mast 51 (see FIG. 1). Therefore, compared to the case where the bracket 370 is fixed to the upper swing body 15, the angle setting of the mast 51 that can be handled can be more various.

  Moreover, a person can get on the upper swing body 15 to which the bracket 370 is attached. Therefore, the relocation work of the bracket 370 can be easily performed. Therefore, it is possible to easily change the angle setting of the mast 51 (see FIG. 1).

(Modification of the third embodiment)
FIG. 8 shows the periphery of a bracket 370A according to a modification of the third embodiment. In the above embodiment, the bracket 370 (see FIG. 7) can be moved in the front-rear direction, but the bracket 370A can be moved in the up-down direction.

  The pin hole 370p of the bracket 370A is formed, for example, near the rear end of the bracket 370A. Further, the bracket attachment portion 390A is disposed along the vertical direction, and is disposed, for example, on the rear side of the bracket 370A. The bracket 370A can be moved (slid) in the vertical direction.

Since the bracket 370A can be moved in the vertical direction as described above, it is not necessary to extend or contract the mast backstop main pillar 61 when changing the angle setting of the mast 51 (see FIG. 1). More specifically, when the mast 51 is raised and lowered without expanding and contracting the mast backstop main column 61, the lower end 61b of the mast backstop main column 61 moves substantially vertically. The bracket 370A is moved in the vertical direction in accordance with the vertical movement. Thereby, the lower end 61b of the mast backstop main pillar 61 can be received by the first standby portion 71 without expanding or contracting the mastbackstop main pillar 61.
As a result, it is possible to save time and labor for expanding / contracting (particularly reducing) the mast backstop main pillar 61. More specifically, the mass of the inner member 63 of the mast backstop main pillar 61 is large, and it is difficult to push it up manually. Therefore, in order to reduce the mast backstop main pillar 61, it is necessary to use some kind of device or to defeat the mast 51, but the time and labor required for these can be saved.

  Note that the direction in which the bracket mounting portion 390A is moved can be variously changed. For example, the bracket attachment portion 390A may be movable in the front-rear direction and the vertical direction (oblique direction).

  As mentioned above, although embodiment of this invention was described based on drawing, a specific structure is not restricted to these embodiment, It can change in the range which does not deviate from the summary of invention.

  For example, in the embodiment described above, the mast backstop 60 and the bracket 70 (170, 270, 270A, 370, 370A) have been mainly described (see FIGS. 2 to 8). It can also be applied to the top 30 and the bracket 40. That is, the above-described features relating to the mast 51, the mast backstop main column 61, the support 66, and the bracket 70 also include the boom 21, the boom backstop main column 31, the support 32, and the bracket 40.

  In addition, for example, a mode in which one (see FIGS. 7 and 8) or two (FIGS. 1 to 6) standby portions is provided on the bracket is shown, but three or more standby portions may be provided on the bracket.

  Further, for example, the configurations shown in the first to third embodiments shown in FIGS. 1 to 8 may be combined. For example, two standby portions may be formed on the transferable bracket 370 (see FIG. 7), and the guide 80 (see FIGS. 4 and 5) may be attached to the bracket 370.

1 Crane 15 Upper swing body 21 Boom (raising / lowering member)
31 Boom backstop main pillar (backstop main pillar)
32, 66 Support 40, 70, 170, 270, 270A, 370, 370A Bracket 51 Mast (undulation member)
61 Mast backstop main pillar (backstop main pillar)
61b Lower end 71 First standby part (standby part)
72 First indentation (indentation)
73 1st inclination part (inclination part)
76 Second standby unit (standby unit)
77 Second indentation (indentation)
78 2nd inclined part (inclined part)
80, 80A Guide 81 First closing part 82 Indentation extension part 86 Second closing part 88 Inclination extension part

Claims (3)

An undulating member attached to the upper swing body;
A backstop main pillar attached to the undulation member;
A support connecting the undulating member and the backstop main pillar;
A bracket attached to the upper swing body and receiving a lower end of the backstop main pillar;
A guide attached to the bracket;
With
The bracket, the order receiving the lower end of the backstop main column at a plurality of positions so as to correspond to a plurality of angular settings of the relief member, recess-shaped with a plurality of waiting portions respectively,
The guide is formed so as to follow one of the plurality of standby units and to block the other standby unit adjacent to the one standby unit.
crane. Each of the plurality of standby units is
A recess having a portion formed in an arc shape when viewed from the side and receiving a lower end of the backstop main pillar;
An inclined part extending from the hollow part to the outer side of the hollow when viewed from the side,
In the first standby part and the second standby part constituting the plurality of standby parts, the recess part of the first standby part and the inclined part of the second standby part are adjacent to each other,
The guide is
A hollow extension formed so as to extend the hollow of the first standby part outward from the hollow when arranged so as to overlap the second standby part when viewed from the side, and a hollow outer end of the hollow extension And a second closing part formed so as to connect the outer end part of the hollow part of the hollow part of the second standby part,
An inclined extension formed so as to extend the inclined portion of the second standby portion to the outside of the recess when arranged so as to overlap the first standby portion as viewed from the side, and a recess outer end of the inclined extension portion comprising a first closing part which is formed so as to connect the parts and the recess outer end of the inclined portion of the first waiting unit, the crane according to claim 1. The crane according to claim 1 or 2 , wherein the bracket can be moved in at least one of a front-rear direction and a vertical direction so as to correspond to a plurality of angle settings of the hoisting member.

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