JP2008254844A - Crane device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crane device capable of easily performing an operation for rotating an arm upward and locking the arm at a use position and an operation for making the arm fall from the use position to a storage position. <P>SOLUTION: This crane device 10 is provided with the arm 30 rotatably connected between the use position deployed in relation to a support 20 and the storage position made to fall downward, a locking device 50 for locking the arm 30 at the use position, a winding device 40, and a rope member 44. The crane device 10 is provided with an energizing means 28 for energizing the arm 30 to the use position, and an arm storage auxiliary mechanism 60 having one end connected to a locking device 54 and the other end connectable to a distal end 45 of the rope member 44 via a prescribed portion 63 of the support 20 and pulled by the rope member 44 to operate the locking device 50 to a lock releasing side and to rotate the arm 30 to a pulling and storing position via the rope member 44, when the rope member 44 is wound up by the winding device 40 in the state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention includes a support, an arm rotatably connected between a use position developed with respect to the support and a retracted storage position, a lock device that locks the arm in the use position, The present invention relates to a crane apparatus including a winding device provided on a support column or an arm, and a rope member that can be wound and unwound by the winding device, hangs down from the tip of the arm, and can connect a lifting object to the tip.

A technique relating to the above-described crane apparatus is described in Patent Document 1.
As shown in FIG. 5, a bracket 103 is fixed to the upper end portion of the column 101 of this crane apparatus, and the base end portion of the arm 102 is connected to the bracket 103 in a state in which the arm 102 can be turned up and down. A disc-like member 105 is fixed to the base end portion of the arm 102, and a rotation center shaft 104 is provided at the center of the disc-like member 105. A recess 105 h is formed on the outer peripheral surface of the disk-like member 105 so that an engagement protrusion 107 k of the lock lever 107 described later can be fitted therein.

The lock lever 107 is a lever that locks the arm 102 to the use position when the arm 102 is lifted to the use position by the user, and is connected to the bracket 103 in a rotatable state by a connection pin 107p. In the lock lever 107, the tip of the engagement protrusion 107 k is always pressed against the outer peripheral surface of the disk-like member 105 of the arm 102 by a spring force. When the arm 102 is rotated upward to the use position, the engagement protrusion 107k of the lock lever 107 is engaged with the recess 105h of the disk-like member 105 by a spring force, and the arm 102 is locked at the use position.
Further, the lock lever 107 is formed with an operation handle 107h at a position opposite to the engagement protrusion 107k and the connecting pin 107p. Accordingly, when the operating handle 107h is pushed against the spring force in a state where a lifting force is applied to the arm 102, the engagement between the engaging protrusion 107k and the recess 105h of the disk-like member 105 is released. . In this state, the arm 102 can be folded.

JP 2001-19362 A

In the above-described crane apparatus, it is necessary for the user of the wheelchair to work alone without the help of a caregiver because the arm 102 needs to be lifted to the use position during use.
Further, when the arm 102 in the use position is folded and stored, the operating handle 107h of the lock lever 107 is pushed and operated with the lifting force applied to the arm 102, and the engagement protrusion 107k and the disc-like member 105 are moved. It is necessary to release the engagement with the recess 105h. That is, it is necessary to push up the arm 102 with one hand and push the operation handle 107h of the lock lever 107 with the other hand. For this reason, it is difficult for a wheelchair user to work without the help of an assistant.

  The present invention has been made to solve the above-mentioned problems, and the problem to be solved by the present invention is to lock the arm to the use position by rotating the arm upward, and to move the arm from the use position to the storage position. It is to allow the user of the wheelchair to perform the operation of lying down.

The above-described problems are solved by the inventions of the claims.
According to the first aspect of the present invention, there is provided a support column, an arm that is rotatably connected between a use position developed with respect to the support column and a retracted storage position, and a lock device that locks the arm in the use position. A crane device comprising: a winding device provided on the support column or the arm; and a rope member that can be wound and unwound by the winding device, hangs down from the tip of the arm, and can connect an object to be lifted to the tip. A biasing means for biasing the arm to a use position; one end is coupled to the locking device, and the other end can be coupled to the tip of the cord member via a predetermined portion of the column; When the cable member is wound up by the winding device in a state where the end is connected to the tip of the cable member, the cable member is pulled by the cable member to operate the lock device to the unlocking side, and the cable member Through Characterized in that it comprises an arm storage auxiliary mechanism for rotating the said storage position pulling the arm Te.

According to the present invention, when the arm in the use position is laid down to the retracted position, the rope member is wound up by the winding device in a state where the other end of the arm retracting auxiliary mechanism is connected to the distal end of the rope member. As a result, the lock member is pulled to the unlocking side by being pulled by the cable member. Further, when the cord member is wound up by the winding device, the arm is pulled by the cord member, and the arm lies down to the retracted position with respect to the support column against the urging means. Thus, by operating the winding device in a state where the other end of the arm storage auxiliary mechanism is connected to the tip of the rope member, the arm can be laid down to the storage position. For this reason, an operation of lifting the arm and releasing the lock state of the lock device becomes unnecessary, and for example, the user of the wheelchair can store the arm in the use position alone.
Further, as described above, if the rope member of the winding device is extended while the arm is in the retracted position, the arm can be deployed to the use position with respect to the support column by the action of the urging means. Furthermore, the arm which has been deployed to the use position can be locked by the locking device. For this reason, it is not necessary to lift the arm to the use position, and the user can independently deploy the arm to the use position.

According to a second aspect of the present invention, the column is fixed when the arm is connected to the fixed column, the rotation column connected to the fixed column coaxially with the fixed column, and the arm is in the retracted position. A rotation lock mechanism for a column that can lock the rotation of the rotary column with respect to the column, and the rotation lock mechanism for the column is not rotatable about an axis with respect to the fixed column, and is in a non-engagement position and an engagement position. An engagement member configured to be movable in the axial direction between and an engaged member fixed to the rotating column and configured to be engageable with the engagement member at the engagement position; The arm is moved from the disengaged position to the engaged position by utilizing the force with which the arm is rotated from the use position to the storage position, and the arm is rotated from the storage position to the use position. The engagement member is moved to the engagement position using force. And having a link mechanism for moving up the disengaged position from the.
For this reason, by rotating the arm downward from the use position to the storage position, the support rotation lock mechanism automatically operates and the rotation support is automatically locked. Moreover, the rotation lock | rock of a rotation support | pillar is automatically cancelled | released by rotating an arm up from a storage position to a use position.

  According to the present invention, the user can independently perform the operation of expanding the arm with respect to the support column and locking the arm in the use position and the operation of falling down from the use position to the storage position.

[Embodiment 1]
Hereinafter, the crane apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4. The crane apparatus according to this embodiment is an apparatus installed in a passenger compartment of a passenger car, and is used when a wheelchair is mounted on a passenger car.
Here, FIG. 1 and FIG. 2 are side views showing a state in which the arm of the crane apparatus according to the present embodiment is deployed to the use position and a state where the arm is laid down to the storage position, and FIG. 3 and FIG. It is a longitudinal cross-sectional view showing a locking mechanism.

<About the whole structure of the crane apparatus 10>
As shown in FIG. 1 and the like, the crane apparatus 10 includes a column 20, an arm 30, a winding device 40 attached to the tip of the arm 30, and a lock mechanism that locks the arm 30 in a state where the arm 30 is deployed to a use position. 50 and an arm storage assist mechanism 60.
The support column 20 includes a base 21 fixed to the floor of the vehicle interior, a short tubular fixed support 22 erected on the base 21, and a flange portion 24f near the lower end that is smaller in diameter than the inner diameter of the fixed support 22. And a cylindrical rotary support 24 having the structure. The lower end portion of the rotating column 24 is inserted into the fixed column 22 from above, and the flange 24f is received by the upper end surface of the fixed column 22, so that the rotating column 24 can be rotated around the axis by the fixed column 22. Supported by
Further, between the fixed column 22 and the rotating column 24, a column rotation lock mechanism 70 that locks the rotation of the rotating column 24 with respect to the fixed column 22 is provided. The configuration of the support rotation lock mechanism 70 will be described later.

A box-shaped bracket 25 is attached to the upper end portion of the rotary column 24, and a disk-shaped member 32 is connected to a vertical wall surface 25 f of the bracket 25 so as to be rotatable around the center support shaft 33. The base end portion of the arm 30 is fixed to the disc-like member 32 so as to cross the disc-like member 32 through the center support shaft 33. As a result, the arm 30 can be turned up and down around the central support shaft 33.
Further, a gas spring 28 urged so as to push up (deploy) the arm 30 with respect to the rotating column 24 is installed between the outer surface of the rotating column 24 and the outer surface of the arm 30. Yes. The gas spring 28 includes a piston rod portion 28p connected to the rotary support column 24 and a cylinder portion 28s connected to the arm 30. A gas having a predetermined pressure is sealed in the cylinder portion 28s. The piston rod portion 28p is pushed out of the cylinder portion 28s by the gas pressure. As a result, the arm 30 is pushed upward with respect to the rotary support column 24 by the force of the gas spring 28 as described above.

The winding device 40 is a device used for raising and lowering a wheelchair, and includes a device main body 43, a suspension wire 44, and a hook 45 attached to the tip of the suspension wire 44. The apparatus main body 43 includes a drum (not shown) configured to wind up the suspension wire 44 and to be able to pay out, and a motor (not shown) that rotates the drum. The motor is configured to be able to rotate in a drum winding direction and a feeding direction when a user operates a remote controller.
That is, the suspension wire 44 and the hook 45 correspond to the rope member of the present invention.

<About the lock mechanism 50>
The lock mechanism 50 is a mechanism that locks the rotation of the arm 30 with respect to the rotary column 24 in a state where the arm 30 is deployed to the use position. The lock mechanism 50 includes a lock lever 52 connected to the bracket 25 of the rotary column 24 and a recess 57 formed on the outer peripheral surface of the disk-shaped member 32 of the arm 30.
As shown in FIGS. 1 and 2 and the like, the lock lever 52 is formed with an engagement protrusion 53 that is curved in a hook shape on the distal end side, and a wire receiving portion 54 is provided on the proximal end side. The lock lever 52 is disposed along the vertical wall surface 25 f of the bracket 25, and is connected to the bracket 25 in a state where the position near the center base end portion of the lock lever 52 is rotatable around the axis by the connecting shaft 51. ing.

The engagement protrusion 53 of the lock lever 52 is configured to come into contact with the outer peripheral surface 32r of the disk-like member 32 when the lock lever 52 rotates counterclockwise. A coil spring (not shown) that is biased in a direction to rotate the lock lever 52 counterclockwise is mounted around the connecting shaft 51. Thereby, the engagement protrusion 53 of the lock lever 52 is always in contact with the outer peripheral surface 32r of the disk-like member 32 by the spring force of the coil spring.
On the outer peripheral surface 32r of the disk-like member 32, a recess 57 is formed in which the engagement protrusion 53 of the lock lever 52 can be engaged. The recess 57 is formed at a position where the engagement protrusion 53 of the lock lever 52 can be engaged when the arm 30 is deployed (upwardly rotated) to the use position. The engagement protrusion 53 of the lock lever 52 engages with the recess 57 of the disk-like member 32, whereby the rotation of the disk-like member 32 of the arm 30 with respect to the bracket 25 of the rotary column 24 is restricted, and the arm 30 is in the use position. (See FIG. 1).
Further, when the wire receiving portion 54 of the lock lever 52 is pulled downward by the wire 62 of the arm storing auxiliary mechanism 60 described later, the lock lever 52 rotates right against the spring force of the coil spring, and the engagement of the lock lever 52 is increased. The engagement between the mating protrusion 53 and the concave portion 57 of the disk-like member 32 is released.

<About the arm retracting auxiliary mechanism 60>
The arm storage auxiliary mechanism 60 is a mechanism for causing the arm 30 in the use position to fall down to the storage position (see FIG. 2) using the operation of the winding device 40. The arm storage auxiliary mechanism 60 includes the above-described wire 62, pulleys 63, 64, 65 on which the wire 62 is hung, and a hook 67 connected to one end of the wire 62.
The other end of the wire 62 opposite to the hook 67 is connected to the wire receiving portion 54 of the lock lever 52.
A first pulley 63 is attached to the rotary column 24 below the bracket 25, and a wire 62 is hung from below on the first pulley 63. For this reason, when tension is applied to the wire 62, the wire receiving portion 54 of the lock lever 52 is pulled downward.
A second pulley 64 is attached to the side of the arm 30 at a position near the base end, and a third pulley 65 is attached at a position near the tip. A wire 62 is hung from above on the second pulley 64 and the third pulley 65.
The length of the wire 62 is such that the hook 67 is positioned at the position of the third pulley 65 when the arm 30 is locked at the use position and the wire receiving portion 54 of the lock lever 52 is pulled upward by a spring force. Set to retained dimensions.

  As shown in FIG. 1, when the arm 30 is in the use position and the lock mechanism 50 is in the locked state, in order to cause the arm 30 to fall down to the retracted position, first, the hook 45 of the winding device 40 is moved to the arm retracting assist mechanism. Hang on 60 hooks 67. In this state, when the motor of the winding device 40 is driven and the suspension wire 44 is wound around the drum, the hook 67 of the arm storage auxiliary mechanism 60 is pulled by the hook 45 of the winding device 40. As a result, the wire receiving portion 54 of the lock lever 52 is pulled in the direction (downward) of the first pulley 63 by the wire 62 of the arm storage auxiliary mechanism 60. As a result, the lock lever 52 rotates upward (to the right) against the spring force of the coil spring, and the engagement between the engagement protrusion 53 of the lock lever 52 and the recess 57 of the disk-like member 32 is released. That is, the lock state of the lock mechanism 50 is released.

When the suspension wire 44 of the winding device 40 is continuously wound on the drum from this state, the wire 62 of the arm storage auxiliary mechanism 60 is pulled out from the third pulley 65 by the hook 67. At this time, since the other end of the wire 62 does not move from the position of the wire receiving portion 54 of the lock lever 52, when the wire 62 is pulled out from the third pulley 65 by the hook 67, the tension of the wire 62 causes the second pulley 64 to move to the second pulley 64. It acts to approach one pulley 63. As a result, the arm 30 rotates in the lying down direction against the force of the gas spring 28 and is returned to the retracted position shown in FIG.
Further, in order to deploy the arm 30 in the retracted position to the use position, the arm 30 is deployed by the force of the gas spring 28 by unwinding the suspension wire 44 of the winding device 40 from the drum. be able to.
That is, the gas spring 28 corresponds to the biasing means of the present invention.

<About the support rotation lock mechanism 70>
The support rotation lock mechanism 70 locks the rotation of the rotary support 24 with respect to the fixed support 22 in a state where the arm 30 is returned to the storage position shown in FIG. 2, and the arm 30 is deployed (rotated upward) from the storage position. It is a mechanism that sometimes releases the rotation lock.
As shown in FIGS. 3 and 4, the support rotation lock mechanism 70 includes an engagement member 72 housed in the fixed support 22, an engaged member 74 provided on the lower end surface of the rotation support 24, The link mechanism 78 is configured to move the engaging member 72 to the upper limit position for engaging with the engaged member 74 in conjunction with the downward rotation of the arm 30.
The engaging member 72 is formed in a short cylindrical shape, and includes a disk-like upper plate 72u and a lower plate 72d. The upper surface of the upper plate 72u has an unevenness 72m made up of a triangular ridge and groove. It is formed in the radial direction (radial). Further, a center hole 72h through which the axial link 78p of the link mechanism 78 passes is formed at the center between the upper plate 72u and the lower plate 72d. In addition, a plurality of vertical grooves (not shown) are formed on the outer peripheral surface of the engaging member 72, and the anti-rotation protrusions 22 t extending in the vertical direction on the inner peripheral surface of the fixed column 22 are fitted into these vertical grooves. It is. As a result, the engaging member 72 is accommodated in the fixed column 22 in a state where the engaging member 72 is allowed to move up and down and cannot rotate about the axis.

The engaged member 74 provided on the rotating column 24 is a disk-like member fixed to the lower end of the rotating column 24, and the unevenness 72m of the upper plate 72u of the engaging member 72 can be fitted to the lower surface side thereof. The unevenness 74m is formed in the radial direction (radial). Further, a center hole 74 h through which the shaft-like link 78 p of the link mechanism 78 is passed is formed at the center of the engaged member 74.
The link mechanism 78 includes the elongated shaft-shaped link 78p formed linearly, and the upper end of the shaft-shaped link 78p is connected to the disk-shaped member 32 of the arm 30 in a rotatable state. The shaft-shaped link 78p is connected to a position eccentric from the center support shaft 33 of the disk-shaped member 32 in the direction opposite to the extending direction of the arm 30 so that the arm 30 is pulled up when the arm 30 is rotated downward to the retracted position. Yes. Further, as described above, the shaft-shaped link 78p is passed through the center hole 74h of the engaged member 74 and the center hole 72h of the upper plate 72u and the lower plate 72d of the engagement member 72. The lower end portion of 78p protrudes downward from the lower plate 72d. A spring receiving plate 78z is fixed to the protruding end of the shaft-shaped link 78p, and a coil spring 78s is mounted between the spring receiving plate 78z and the lower plate 72d of the engaging member 72. The coil spring 78s is biased in a direction in which the engaging member 72 is pushed up. Further, a nut 78n for pushing down the lower plate 72d is attached to the shaft-shaped link 78p between the upper plate 72u and the lower plate 72d of the engaging member 72.

  With the above configuration, when the arm 30 is rotated downward to the retracted position, as shown in FIG. 4, the shaft-like link 78p of the link mechanism 78 is pulled up, and the engaging member 72 is pushed up by the spring force of the coil spring 78s. The unevenness 72m of the upper plate 72u of the engaging member 72 is engaged with the unevenness 74m of the engaged member 74 of the rotating column 24. Thereby, the rotation of the rotary column 24 relative to the fixed column 22 is locked. When the arm 30 is turned up to the use position, as shown in FIG. 4, the shaft-like link 78p of the link mechanism 78 is pushed down, and the engaging member 72 is pushed down by the nut 78n of the shaft-like link 78p. . Thereby, the unevenness 72m of the upper plate 72u of the engaging member 72 is separated from the unevenness 74m of the engaged member 74 of the rotating column 24, and the rotation lock of the rotating column 24 with respect to the fixed column 22 is released.

<Operation of the crane apparatus 10>
When the crane apparatus 10 is stored, as shown in FIG. 2, the hook 45 of the winding device 40 is hooked on the hook 67 of the arm storage auxiliary mechanism 60, and the suspension wire 44 of the winding device 40 is wound up. It has been. As a result, the arm 30 falls to the retracted position against the force of the gas spring 28 and is held at this position. Furthermore, when the arm 30 falls to the retracted position, the rotary support 24 is rotationally locked to the fixed support 22 by the support of the support rotation lock mechanism 70.
When the crane device 10 is used, first, the winding device 40 is operated to feed the suspension wire 44. As a result, the arm 30 deploys while rotating upward by the force of the gas spring 28. When the arm 30 is rotated upward, the tip (engagement protrusion 53) of the lock lever 52 of the lock mechanism 50 slides on the outer peripheral surface 32r of the disk-like member 32 of the arm 30 as the arm 30 rotates. Then, when the arm 30 is turned up to the use position, the lock lever 52 is engaged with the recess 57 formed on the outer peripheral surface 32r of the disk-like member 32 by the force of the coil spring, and the lock mechanism 50 is locked. . Thereby, the arm 30 is hold | maintained in a use position, and the upper rotation of the arm 30 stops.

Further, when the arm 30 is rotated upward, the shaft-like link 78p of the support rotation lock mechanism 70 is pushed down, the engagement member 72 is lowered, and the unevenness 72m of the upper plate 72u of the engagement member 72 is rotated. It moves away from the unevenness 74 m of the engaged member 74 of the support column 24. Thereby, the rotation lock of the rotary column 24 with respect to the fixed column 22 is released, and the arm 30 can be rotated horizontally together with the rotary column 24.
Next, while feeding the suspension wire 44 of the winding device 40, the hook 45 of the suspension wire 44 is removed from the hook 67 of the arm storage auxiliary mechanism 60, and the hook 45 is hung on a predetermined part of the wheelchair. In this state, the wheelchair can be lifted while winding the suspension wire 44 by the winding device 40, and the arm 30 can be horizontally rotated to carry the wheelchair out of the passenger compartment. Next, the wheelchair can be lowered to the side of the passenger car by feeding the suspension wire 44 by the winding device 40 in a state where the wheelchair is carried out of the passenger compartment.

After the wheelchair is lowered, the hook 45 of the suspension wire 44 is removed from the wheelchair, the hook 45 is hooked on the hook 67 of the arm storing auxiliary mechanism 60, and then the arm 30 is horizontally rotated to the vehicle interior. Next, the suspension wire 44 is wound up by the winding device 40. As a result, when the winding of the suspension wire 44 progresses and tension is applied to the wire 62 of the arm storage auxiliary mechanism 60, the lock lever 52 of the lock mechanism 50 is pulled by the wire 62, and the engagement protrusion 53 of the lock lever 52 is pulled. And the recess 57 of the disk-like member 32 of the arm 30 are released. When the suspension wire 44 is further wound from this state, the arm 30 rotates in the inclining direction against the force of the gas spring 28 and is returned to the retracted position shown in FIG.
Furthermore, when the arm 30 is rotated in the lying down direction, the shaft-like link 78p of the support rotation lock mechanism 70 is pulled up, and the engaging member 72 is pushed up by the spring force of the coil spring 78s. The unevenness 72m of the upper plate 72 is engaged with the unevenness 74m of the engaged member 74 of the rotating column 24. Thereby, the rotation of the rotary column 24 relative to the fixed column 22 is locked.

<Advantages of the crane apparatus 10 according to this embodiment>
According to the crane device 10 according to the present embodiment, the hook 67 of the arm storage auxiliary mechanism 60 and the hook 45 of the suspension wire 44 are connected in a state where the arm 30 is in the use position, and the winding device 40 is moved in the winding direction. By operating, after releasing the lock state of the lock device 50, the arm 30 can be laid down to the storage position. For this reason, the operation which lifts the arm 30 and cancels the locked state of the locking device 50 becomes unnecessary. For example, a user of a wheelchair can store the arm 30 in the use position alone.
Further, when the arm 30 is in the retracted position, the arm 30 can be unfolded to the use position with respect to the rotating column 24 by the force of the gas spring 28 by feeding the suspension wire 44 by the winding device 40. Further, the arm 30 deployed to the use position can be automatically locked by the lock device 50. For this reason, it becomes unnecessary to lift the arm 30 to the use position, and the user can deploy the arm 30 to the use position independently.

<Modification example of vehicle seat 10>
In addition, this invention is not limited to the said embodiment, The change in the range which does not deviate from the summary of this invention is possible.
For example, in the present embodiment, an example in which the device main body 43 of the winding device 40 is provided at the tip of the arm 30 is shown, but the device main body 43 is provided on the bracket 25 of the support column 20 and the suspension wire 44 is provided at the tip of the arm 30. It is also possible to have a configuration in which a pulley or the like is provided.
In the present embodiment, the example in which the gas spring 28 is used as the urging means has been described. However, for example, a plate spring or the like can be used instead of the gas spring 28.
Further, in the present embodiment, an example in which two pulleys 64 and 65 of the arm storing auxiliary mechanism 60 are provided on the arm 30 is shown, but the number of pulleys can be appropriately changed depending on the length of the arm 30.
Further, in the present embodiment, the example in which the shaft-like link 78p is used as the link mechanism 78 of the support rotation lock mechanism 70 is shown, but a wire or the like may be used instead of the shaft-like link 78p.

It is a side view showing the state which developed the arm of the crane apparatus concerning Embodiment 1 of the present invention to the use position. It is a side view showing the state which fell the arm of the crane apparatus to the storage position. It is the longitudinal cross-sectional view (A figure) showing the lock release state of the rotation lock mechanism for support | pillars, and the B section enlarged view (B figure) of A figure. It is a longitudinal cross-sectional view showing the locked state of the rotation lock mechanism for supports. It is a side view showing the rotation lock mechanism of the arm of the conventional crane apparatus.

Explanation of symbols

20 ... post 22 ... fixed post 24 ... rotating post 28 ... gas cylinder (biasing means)
30 ... Arm 40 ... Winding device 44 ... Hanging wire (cord member)
45 ... Hook (Rope member)
50... Lock mechanism 60... Arm storage auxiliary mechanism 70... Rotating lock mechanism 72 for column. Engaging member 74.

Claims (2)

A strut, an arm rotatably connected between a use position developed with respect to the strut and a retracted position lying down, a lock device that locks the arm in the use position, and the strut or arm. A crane device comprising: a winding device provided; and a rope member that can be wound and unwound by the winding device, hangs down from the tip of the arm, and can connect a lifting object to the tip;
A biasing means for biasing the arm to a use position;
One end is connected to the locking device, the other end can be connected to the tip of the cable member via a predetermined part of the support column, and the other end is connected to the tip of the cable member, and the winding device When the cord member is wound by the arm member, the arm retracting aid is pulled by the cord member to operate the lock device to the unlocking side, and pulls the arm via the cord member to rotate to the retracted position. A crane apparatus comprising a mechanism. The crane apparatus according to claim 1,
The strut includes a fixed strut, a rotating strut connected to the arm in a configuration that can rotate coaxially with the fixed strut, and rotation of the rotating strut relative to the fixed strut when the arm is in the retracted position. A rotation lock mechanism for lockable struts,
The support rotation lock mechanism includes an engagement member configured to be non-rotatable about an axis with respect to the fixed support and movable in an axial direction between a non-engagement position and an engagement position, and the rotation support The engagement member is configured to be engaged with the engagement member that is fixed to the engagement position so that the engagement member can be engaged with the engagement member, and a force that rotates the arm from the use position to the storage position. The member is moved from the disengaged position to the engaged position, and the engaging member is moved from the engaged position to the disengaged position using a force by which the arm rotates from the retracted position to the used position. A crane apparatus comprising a link mechanism for movement.

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