JP2022085077A - Lifting tool and lifting method - Google Patents

Abstract

To prevents clamp release during lifting.SOLUTION: A lifting tool 1 for lifting a pillar including an arm metal 3 includes a clamp portion 11, a lifting portion 13, and a clutch portion 15. The clamp portion 11 clamps the arm metal 3. The lifting portion 13 is connected to a lifting device. The clamp portion 11 includes a pressing member 27 capable of pressing/releasing the arm metal 3 by rotation of a screw shaft 51. The clutch portion 15 includes a screw shaft 51 that can be raised and lowered with respect to the lifting portion 13 below the lifting portion 13. When a distance between the screw shaft 51 and the lifting portion 13 is long, the clutch portion 15 is in a cutoff state in which the rotation of the lifting portion 13 is not transmitted to the screw shaft 51. When the distance between the screw shaft 51 and the lifting portion 13 is short, the clutch portion 15 is in a connected state in which the rotation of the lifting portion 13 is transmitted to the screw shaft 51. When the lifting portion 13 is lifted by the lifting device, the distance between the screw shaft 51 and the lifting portion 13 becomes long due to gravity.SELECTED DRAWING: Figure 1

Description

The present invention relates to lifting a pillared object including an arm.

Conventionally, a hanging tool for attaching a pole-mounted object to a pole such as a utility pole has been known. Patent Document 1 discloses this type of hanging tool.

The hanging tool of Patent Document 1 includes a link member and an auxiliary frame arranged so as to face each other. A holding portion for holding the dragonfly arm is formed between the link member and the auxiliary frame. A lock member is connected to the link member, and the lock member can be engaged with the tip end portion of the auxiliary frame. In this engaged state, the holding state of the dragonfly arm in the holding portion can be locked by screwing and tightening the tightening member to the tip end portion of the locking member.

Japanese Unexamined Patent Publication No. 7-193952

In the configuration of Patent Document 1, even after the holding state of the dragonfly arm is locked, if the tightening member comes into contact with a surrounding object in the process of lifting work, the tightening is loosened and the locking and holding are unintentionally released. There was a risk of being done.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent unintentional release of a clamp at the time of lifting.

Means and effects to solve problems

The problem to be solved by the present invention is as described above, and next, the means for solving this problem and its effect will be described.

According to the first aspect of the present invention, a mounting tool having the following configuration is provided. That is, this mounting tool is used to lift a pillar including an arm. The lifting tool includes a clamp portion, a lifting portion, and a clutch portion. The clamp portion clamps the arm metal. The lifting portion can be connected to the lifting device. The clutch portion is provided between the clamp portion and the lifting portion. The clamp portion includes a pressing member capable of pressing / releasing the arm metal by rotating the screw shaft. The clutch portion includes an elevating member that can be raised and lowered with respect to the lifting portion below the lifting portion. When the distance between the elevating member and the lifting portion is long, the clutch portion is in a shutoff state in which the rotation of the lifting portion is not transmitted to the screw shaft. When the distance between the elevating member and the lifting portion is short, the clutch portion is in a connected state in which the rotation of the lifting portion is transmitted to the screw shaft. When the lifting portion is lifted by the lifting device, the distance between the lifting member and the lifting portion becomes long due to gravity.

With this configuration, when the lifting portion is lifted by the lifting device, the distance between the lifting member and the lifting portion becomes long. Therefore, since the clutch portion is automatically shut off, the rotation of the lifting portion is not transmitted to the screw shaft. As a result, it is possible to prevent the arm clamp from being unintentionally released during lifting.

The lifting tool preferably includes an elastic member that applies an elastic force in a direction that increases the distance between the lifting member and the lifting portion.

As a result, when the lifting portion is lifted, the clutch portion can be reliably shut off.

In the lifting tool, the elastic force of the elastic member pushes up the lifting portion against the weight of the lifting portion in a state where the lifting portion is not connected to the lifting device to push the clutch portion. It is preferable that the size is such that it can be in a cut-off state.

As a result, the clutch portion can be maintained in the disengaged state even before the lifting tool is lifted.

The above-mentioned hanging tool preferably has the following configuration. That is, the clutch portion includes a rotation input member that rotates about a rotation axis in the vertical direction integrally with the lifting portion. A protrusion is provided on one of the rotation input member and the elevating member. A first recess and a second recess are formed on the other side of the rotation input member and the elevating member. The first recess is formed as an annular groove in which the inserted protrusion can move in the circumferential direction. The second recess is formed by connecting to the first recess. The second recess prevents the inserted protrusion from moving in the circumferential direction. When the protrusion enters the first recess, the clutch portion is in the disengaged state. When the protrusion enters the second recess, the clutch portion is in the connected state.

This makes it possible to realize a clutch portion having a simple and compact structure.

In the hanging tool, the clamp portion is preferably formed in a C shape.

This makes it possible to realize a clamp portion having a simple and lightweight configuration.

In the hanging tool, it is preferable to provide a support portion that is detachably attached to the clamp portion and supports the clamp portion above the ground plane.

This facilitates the work on the arm. In addition, after the work is completed, the hanging tool can be lifted together with the arm metal by a simple work.

In the hanging tool, it is preferable to include a lock portion that locks the clamp portion while being mounted on the support portion.

This makes it possible to prevent the clamp portion from being unintentionally disengaged from the support portion.

In the hanging tool, the support portion preferably includes a plurality of legs that can be opened and closed.

As a result, the support portion can be compactly stored when the hanging tool is not used.

According to the second aspect of the present invention, the following lifting method is provided. That is, in this lifting method, a pillar including an arm is lifted by using a lifting tool including a clamp portion, a lifting portion, and a clutch portion. The clamp portion clamps the arm metal by a pressing member capable of pressing / releasing the arm metal with the rotation of the screw shaft. The lifting portion can be connected to the lifting device. The clutch portion is provided between the clamp portion and the lifting portion. The lifting method includes a clamping step and a lifting step. In the clamping step, the clutch portion is rotated by rotating the lifting portion by setting the distance between the lifting portion and the elevating member that can be raised and lowered with respect to the lifting portion below the lifting portion to be short. The connection state is transmitted to the screw shaft. In the clamping step, in the connected state of the clutch portion, the screw shaft is rotated together with the lifting portion, and the arm metal is clamped by the pressing member. In the lifting step, by lifting the lifting portion with the lifting device, the distance between the lifting member and the lifting portion becomes long due to gravity, and the clutch portion is rotated by the rotation of the lifting portion. Is in a cutoff state in which is not transmitted to the screw shaft.

In this method, in the lifting process in which the lifting portion is lifted by the lifting device, the distance between the lifting member and the lifting portion becomes long. Therefore, since the clutch portion is automatically shut off, the rotation of the lifting portion is not transmitted to the screw shaft. As a result, it is possible to prevent the arm clamp from being unintentionally released during lifting.

The side view of the hanging tool which concerns on one Embodiment of this invention. Front view of the hanging tool. Perspective view of the hanging tool. Top side view of the hanging tool. Front view of the top of the hanging tool. Bottom view of the top of the hanging tool. A partially enlarged view of FIG. FIG. 7 is a cross-sectional view taken along the line AA of FIG. FIG. 5 is a cross-sectional view showing a state in which the lifting portion and the rotary cylinder are lowered from the state shown in FIG. FIG. 9 is a cross-sectional view showing a state in which the lifting portion, the rotary cylinder, and the screw shaft are rotated from the state of FIG. 9 and the pressing member is lowered by screw feeding. Side view of the bottom of the hanging tool. Front view of the bottom of the hanging tool. Bottom view of the bottom of the hanging tool. The figure which shows the state of lifting an arm metal using a hanging tool.

Next, an embodiment of the present invention will be described with reference to the drawings. First, with reference to FIGS. 1 to 3, the overall configuration of the suspension tool 1 according to the embodiment of the present invention will be described. FIG. 1 is a side view of the hanging tool 1. FIG. 2 is a front view of the hanging tool 1. FIG. 3 is a perspective view of the hanging tool 1.

The hanging tool 1 is used to lift a pillar object such as an arm metal 3 in the work of fixing the pillar object such as an arm metal 3 to the upper part of the support column 9 shown in FIG. The arm metal 3 is a linearly elongated member. A strip-shaped member (hanger band) (not shown) is fixed at an appropriate position of the arm metal 3, and the arm metal 3 can be fixed to the support column 9 via this member. The lifting tool 1 can be lifted together with the arm metal 3 by a lifting device 7 such as a winch.

Although the details will be described later, the hanging tool 1 can also be used to attach an instrument such as an insulator 5 to the arm metal 3 before the arm metal 3 is attached to the support column 9. Therefore, the hanging tool 1 can also be called a mounting tool.

When the insulator 5 is attached to the arm metal 3 by using the hanging tool 1, the arm metal 3 is in a state of being removed from the support column 9. The insulator 5 is attached to the arm metal 3, for example, with the hanging tool 1 installed on the ground. After that, the arm 3 to which the insulator 5 is attached is lifted by the suspension device 7 and attached to a predetermined position on the upper part of the support column 9.

As shown in FIGS. 1 to 3, the lifting tool 1 includes a clamp portion 11, a lifting portion 13, a clutch portion 15, and a support stand (support portion) 17. In the following, in order to explain the relative positional relationship of each configuration, the front-back direction, the left-right direction, and the up-down direction of the suspension tool 1 are defined according to the arrows shown in FIGS. 1 to 3. However, the definitions of these directions are for convenience. The left-right direction coincides with the longitudinal direction of the arm metal 3 attached to the hanging tool 1. The rear direction is the direction in which the arm metal 3 is set on the clamp portion 11. The forward direction is the direction in which the arm metal 3 is removed from the clamp portion 11.

The clamp portion 11, the lifting portion 13, and the clutch portion 15 are provided on the upper portion of the lifting tool 1. The clamp portion 11 is located below the lifting portion 13. The clutch portion 15 is arranged between the clamp portion 11 and the lifting portion 13 in the vertical direction. The support stand 17 is provided at the lower part of the hanging tool 1.

Next, the clamp portion 11 of the suspension tool 1 will be described with reference to FIGS. 4, 5 and 6. FIG. 4 is a side view of the upper part of the hanging tool 1. FIG. 5 is a front view of the upper part of the hanging tool 1. FIG. 6 is a bottom view of the upper part of the hanging tool 1.

The clamp portion 11 can clamp the arm metal 3. As shown in FIGS. 4 and 5, the clamp portion 11 is configured to be hollow. The internal space 31 of the clamp portion 11 is open on both sides in the left-right direction and is open in the front. The clamp portion 11 can be immovably fixed by passing the arm metal 3 through the internal space 31 in a state of being oriented in the left-right direction.

In the present embodiment, the clamp portion 11 is formed in a C shape that opens toward the front. The clamp portion 11 has a first extension portion 21, a second extension portion 23, a third extension portion 25, a pressing member 27, and a mounting portion 29.

The first extension portion 21 is provided so as to extend in the front-rear direction. The second extension portion 23 is provided so as to extend in the vertical direction. The third extension portion 25 is provided so as to extend in the front-rear direction. The first extension portion 21 and the third extension portion 25 are arranged substantially in parallel so as to face each other with a predetermined interval in the vertical direction. The second extension portion 23 is arranged between the first extension portion 21 and the third extension portion 25.

The rear end portion of the first extension portion 21 is connected to the lower end portion of the second extension portion 23. The rear end portion of the third extension portion 25 is connected to the upper end portion of the second extension portion 23. As a result, the first extension portion 21, the second extension portion 23, and the third extension portion 25 are continuously provided so as to have a substantially C shape as a whole.

Of the clamp portions 11, the first extension portion 21, the second extension portion 23, and the third extension portion 25 are configured by arranging a pair of C-shaped plate-shaped members. As shown in FIG. 3, an appropriate gap is formed between the two plate-shaped members.

The pressing member 27 is arranged in the internal space 31 of the clamp portion 11 (the space surrounded by the first extension portion 21, the second extension portion 23, and the third extension portion 25), and is provided so as to be movable in the vertical direction. .. The pressing member 27 is located on the side (upper side) closer to the third extension portion 25 with respect to the internal space 31. By moving the pressing member 27 downward with the arm metal 3 inserted in the internal space 31, the arm metal 3 can be sandwiched between the pressing member 27 and the first extension portion 21 in the vertical direction. As a result, the intermediate portion of the arm metal 3 in the longitudinal direction can be fixed to the clamp portion 11.

The vertical movement of the pressing member 27 is performed by the rotation of the screw shaft 51 via the clutch portion 15. This point will be described later.

As shown in FIG. 4, a first stopper 33 projecting upward is formed at the front end portion of the first extension portion 21. A second stopper 35 projecting downward is formed at the front end portion of the pressing member 27. The first stopper 33 and the second stopper 35 are arranged so as to face each other in the vertical direction. The first stopper 33 and the second stopper 35 partially close the opening in front of the internal space 31. With the arm metal 3 sandwiched between the first extension portion 21 and the pressing member 27, the arm metal 3 can be prevented from coming off the clamp portion 11 by the first stopper 33 and the second stopper 35.

The mounting portion 29 is used to attach and detach the clamp portion 11 to the support stand 17. The mounting portion 29 is provided on the lower side of the clamp portion 11. The mounting portion 29 is formed in a block shape. Insertion holes are formed in the mounting portion 29 in the vertical direction. As shown in FIG. 6, which is a bottom view, an insertion space 37 into which the protrusion 89 of the support stand 17, which will be described later, can be inserted is formed inside the insertion hole.

The mounting portion 29 is provided with a first pin 41 and a second pin 43. The first pin 41 and the second pin 43 are horizontally inserted into the mounting portion 29. The first pin 41 and the second pin 43 are arranged so as to be oriented in different directions from each other. The first pin 41 projects toward the center of the circular insertion space 37, and the second pin 43 projects along the tangential direction of the insertion space 37.

Each of the first pin 41 and the second pin 43 is supported by the mounting portion 29 so as to be movable in the longitudinal direction thereof. The first pin 41 and the second pin 43 can move between the lock position protruding inside the insertion space 37 and the unlock position retracted from the insertion space 37. In FIG. 6, the locked positions of the first pin 41 and the second pin 43 are shown by solid lines or broken lines, and the unlocked positions are shown by chain lines. As described above, the first pin 41 and the second pin 43 function as a lock portion for holding the mounting portion 29 in a state of being mounted on the support stand 17.

The first pin 41 and the second pin 43 are provided with a handle portion for an operator to hook a finger. Although not shown, the mounting portion 29 is provided with a known detent mechanism for holding the positions of the first pin 41 and the second pin 43.

Next, the lifting portion 13 of the lifting tool 1 will be described with reference to FIGS. 4 and 5.

The lifting portion 13 is connected to the lifting device 7 when the arm 3 is lifted by the lifting device 7. The lifting portion 13 is arranged above the clamp portion 11. The lifting portion 13 is connected to the clamp portion 11 via the clutch portion 15.

An opening 49 is formed in the lifting portion 13. As a result, as shown in FIG. 14, a hook fixed to the lower end of the lifting rope 47 of the lifting device 7 can be hung on the lifting portion 13 and connected. The ring-shaped portion formed with the opening 49 also functions as a handle portion on which the operator hangs a finger to rotate the lifting portion 13. The lifting portion 13 has a front-rear width and a left-right width smaller than the front-rear width and the left-right width of the clamp portion 11 having a C-shape, respectively, and is designed to be miniaturized.

Next, the clutch portion 15 of the suspension tool 1 will be described with reference to FIGS. 4, 5, 7, 8, 9, and 10. FIG. 7 is a partially enlarged view of FIG. FIG. 8 is a cross-sectional view taken along the line AA of FIG. FIG. 9 is a cross-sectional view showing a state in which the lifting portion 13 and the rotary cylinder 53 are lowered from the state of FIG. FIG. 10 is a cross-sectional view showing a state in which the lifting portion 13, the rotary cylinder 53, and the screw shaft 51 are rotated from the state of FIG. 9 and the pressing member 27 is lowered by screw feeding.

As shown in FIGS. 4 and 5, the clutch portion 15 is provided between the clamp portion 11 and the lifting portion 13. By rotating the screw shaft 51 provided in the clutch portion 15, it is possible to switch between holding / releasing the arm metal 3 by the clamp portion 11. Specifically, the vertical position of the pressing member 27 can be changed by screw feeding by rotating the screw shaft 51. As a result, it is possible to switch between a state in which the arm metal 3 is sandwiched between the first extension portion 21 and the pressing member 27 and a state in which the pressing member 27 is separated from the arm metal 3.

As shown in FIGS. 7 and 8, the clutch portion 15 has a screw shaft (elevating member) 51, a rotary cylinder (rotation input member) 53, and a first elastic member (elastic member) 55. .. The screw shaft 51 is provided so as to be relatively rotatable with respect to the clamp portion 11 about a vertical axis. Since the screw shaft 51 is screw-coupled to the clamp portion 11, the screw shaft 51 can move vertically with respect to the clamp portion 11 in conjunction with the relative rotation. The upper portion of the screw shaft 51 projects above the clamp portion 11. The upper end of the screw shaft 51 is covered with a rotary cylinder 53.

The screw shaft 51 is composed of a shaft-shaped member. The screw shaft 51 is arranged so that the axial direction is along the vertical direction. The screw shaft 51 is provided so as to penetrate the third extension portion 25 in the vertical direction. A pressing member 27 is supported on the protruding end (lower end) of the screw shaft 51 so as to be relatively rotatable.

The screw shaft 51 is provided with a male screw portion 67. The male screw portion 67 is screwed into the female screw portion of the nut portion 69 fixed to the third extension portion 25. In this way, the screw shaft 51 is connected to the third extension portion 25 (clamp portion 11). When the screw shaft 51 rotates to one side, the screw shaft 51 moves downward, and when the screw shaft 51 rotates to the opposite side, the screw shaft 51 moves upward.

The pressing member 27 moves in the vertical direction as the screw shaft 51 moves. The pressing member 27 is arranged so as to be sandwiched between two C-shaped plate-shaped members included in the clamp portion 11. As a result, even if the screw shaft 51 rotates, the pressing member 27 can be prevented from rotating due to being hung.

In the screw shaft 51, a first groove portion (first recess) 71 and a second groove portion (second recess) 73 are formed in a portion protruding upward from the third extension portion 25. A plurality (four) of the second groove portions 73 are formed in the present embodiment.

The first groove portion 71 is formed in an annular shape extending in the circumferential direction of the screw shaft 51.

The plurality of second groove portions 73 are formed so as to extend in the vertical direction (direction parallel to the rotation axis of the rotary cylinder 53). Each of the plurality of second groove portions 73 is arranged below the first groove portion 71. The upper end of each second groove portion 73 is connected to the first groove portion 71. The plurality of second groove portions 73 are arranged at predetermined intervals in the circumferential direction of the screw shaft 51.

A protrusion 79, which will be described later, in the rotary cylinder 53 can be inserted into the first groove portion 71 and the second groove portion 73. The protrusion 79 can move between the first groove portion 71 and the second groove portion 73.

When the protrusion 79 is included in the first groove 71 as shown in FIG. 8, the rotary cylinder 53 can rotate relative to the screw shaft 51. In this state, the distance L1 between the screw shaft 51 and the lifting portion 13 is relatively long, and corresponds to the disengaged state of the clutch portion 15.

When the protrusion 79 is included in the second groove 73 as shown in FIGS. 9 and 10, the rotary cylinder 53 cannot rotate relative to the screw shaft 51. In this state, the distance L1 between the screw shaft 51 and the lifting portion 13 is relatively short, and corresponds to the connected state of the clutch portion 15.

The rotary cylinder 53 is arranged so as to cover the upper portion of the screw shaft 51 from the side and the upper side. The rotary cylinder 53 is connected to the lifting portion 13. The rotary cylinder 53 is provided so as to be movable in the vertical direction with respect to the screw shaft 51.

The rotary cylinder 53 has a cylinder portion 77 with one end closed. The tubular portion 77 is arranged so that the opening faces downward. A lifting portion 13 is fixed to the upper end portion of the tubular portion 77 on the closed side. The upper end of the screw shaft 51 is inserted into the opening of the tubular portion 77. The tubular portion 77 is arranged coaxially with the screw shaft 51. The inner diameter of the tubular portion 77 is substantially equal to the outer diameter of the upper portion of the screw shaft 51.

A protrusion 79 is fixed to the tubular portion 77. The protrusion 79 is provided so as to project inward in the radial direction from the rotary cylinder 53. In the present embodiment, the protrusions 79 are composed of bolts and are provided with the same number (4 pieces) as the second groove portion 73. The plurality of protrusions 79 are arranged side by side at equal intervals in the circumferential direction of the tubular portion 77.

The first elastic member 55 is located inside the rotary cylinder 53 and above the screw shaft 51. The first elastic member 55 is arranged between the closed end of the rotary cylinder 53 and the upper surface of the screw shaft 51. The first elastic member 55 is configured by a spring in this embodiment. The expansion and contraction direction of the spring is directed in the vertical direction.

The rotary cylinder 53 is pushed upward with respect to the screw shaft 51 by the first elastic member 55. Since this spring force is larger than the weight of the rotary cylinder 53 and the lifting portion 13, the rotary cylinder 53 is usually located at a position upwardly separated from the screw shaft 51 as shown in FIG. At this time, the protrusion 79 is located in the first groove portion 71. In this state, the rotary cylinder 53 can rotate relative to the upper part of the screw shaft 51.

In the state of FIG. 8, even if the rotary cylinder 53 rotates, the rotation is not transmitted to the screw shaft 51. Therefore, the pressing member 27 does not move by the screw. In this way, it is practically impossible to switch the clamping / unclamping of the arm 3 by the clamp portion 11.

As shown in FIG. 9, the rotary cylinder 53 can be pushed downward against the pushing force of the first elastic member 55 by an external force. Along with this, the protrusion 79 moves from the first groove portion 71 to the second groove portion 73. In this state, the rotary cylinder 53 cannot rotate relative to the upper part of the screw shaft 51.

In the state of FIG. 9, the rotation of the rotary cylinder 53 can be transmitted to the screw shaft 51. Therefore, the pressing member 27 can be screwed up and down by the rotation of the screw shaft 51, and the clamping / unclamping of the arm metal 3 by the clamp portion 11 can be switched. FIG. 10 shows a state in which the pressing member 27 is slightly lowered to clamp the arm metal 3.

Next, the support stand 17 of the suspension tool 1 will be described with reference to FIGS. 11, 12, and 13. FIG. 11 is a side view of the lower part of the hanging tool 1. FIG. 12 is a front view of the lower part of the hanging tool 1. FIG. 13 is a bottom view of the lower part of the hanging tool 1.

The support stand 17 is attached to the clamp portion 11 from below. The support stand 17 can support the clamp portion 11 and the like in a state of being separated upward from the installation surface of the support stand 17. The clamp portion 11 can also be removed by pulling it upward from the support stand 17. As shown in FIGS. 11 and 12, the support stand 17 has a base 81 and a plurality of legs 83.

The base 81 is located above the support stand 17. The base 81 is removable from the mounting portion 29 of the clamp portion 11. The base 81 is composed of a frame 87 and a protrusion 89. The frame 87 is formed by bending a plate-shaped member into an inverted U shape. Inside the frame 87, one end (upper end) in the longitudinal direction of the plurality of legs 83 is inserted. Each leg 83 is rotatably supported with respect to the frame 87.

The protruding portion 89 is provided so as to project upward from the upper surface of the frame 87. The protrusion 89 is formed in a columnar shape. The protruding portion 89 can be inserted from below into the insertion space 37 of the mounting portion 29 included in the clamp portion 11. A tapered tapered portion is formed at the tip end portion (upper end portion) of the protrusion 89. As a result, the protruding portion 89 can be smoothly inserted into the insertion space 37 of the mounting portion 29.

A plurality of holes 91 (four in the present embodiment) are formed in the protrusion 89. The plurality of holes 91 are arranged side by side at equal intervals in the circumferential direction of the protrusion 89. Each of the plurality of holes 91 is formed so as to extend in the radial direction of the columnar protrusion 89. The first pin 41 provided in the mounting portion 29 can be inserted into the hole portion 91 in the longitudinal direction of the hole portion 91.

A third groove portion 93 is formed in the protruding portion 89. The third groove portion 93 is formed in an annular shape extending in the circumferential direction of the protruding portion 89. The second pin 43 provided in the mounting portion 29 can be inserted into the third groove portion 93 in the tangential direction of the annular third groove portion 93.

When attaching the clamp portion 11 to the support stand 17, first, the protruding portion 89 of the support stand 17 is inserted into the insertion space 37 of the mounting portion 29 in the clamp portion 11, and the clamp portion 11 is attached to the support stand 17 from above. do. At this time, the first pin 41 and the second pin 43 of the mounting portion 29 are moved to the unlocked positions that do not protrude into the insertion space 37.

Next, the second pin 43 is moved to the locked position and fitted into the third groove portion 93 of the protruding portion 89. This makes it possible to prevent the clamp portion 11 from being pulled out.

Next, in a state where the clamp portion 11 is rotated with respect to the support stand 17 and adjusted in an appropriate direction, the first pin 41 of the mounting portion 29 is inserted into any hole portion 91 of the protruding portion 89. As a result, the rotation of the clamp portion 11 can be stopped.

When the support stand 17 is removed from the clamp portion 11, the first pin 41 and the second pin 43 may be moved to the unlocked position, and the clamp portion 11 may be pulled up from the support stand 17.

The plurality of legs 83 are provided so as to extend in an inclined direction from the vertical direction. The plurality of legs 83 are arranged so as to be substantially radial in a plan view. Each leg 83 is supported by a base 81 so as to be rotatable about a horizontal axis. The posture of the plurality of legs 83 can be changed between the unfolded posture shown by the solid line in FIG. 11 and the stored posture shown by the chain line.

The unfolded posture can also be called an open leg posture. By setting the plurality of legs 83 in the deployed posture, the support stand 17 can be made to stand on the installation surface. In this state, the clamp portion 11 is attached to or removed from the support stand 17.

The storage posture is a posture in which a plurality of legs 83 are arranged together. By setting the plurality of legs 83 in the stowed posture, the support stand 17 can be made compact.

The support stand 17 is provided with a leg lock tool 101. With the leg lock tool 101, the plurality of legs 83 can be locked in the deployed posture and the lock can be released. The leg lock tool 101 has a third pin 103, a stopper 104, a cam 105, and a second elastic member 107.

As shown in FIG. 13, the third pin 103 is provided on the frame 87 of the base 81 so as to extend in the left-right direction. The third pin 103 is a linear member and is arranged so as to penetrate the internal space of the frame 87. The third pin 103 is supported by the frame 87 so as to be rotatable about an axis in the longitudinal direction and movable in the axial direction. The third pin 103 is formed with a handle portion on which a finger can be hung. The handle portion rotates integrally with the third pin 103.

As shown in FIGS. 11 and 12, the stopper 104 is provided inside the frame 87 included in the base 81 and near the upper end of the leg 83. The stopper 104 is a plate-shaped member. When the leg portion 83 is in the deployed posture, the stopper 104 hits an appropriate position of the leg portion 83 to prevent the leg portion 83 from further rotating in the leg opening direction.

The cam 105 is arranged in the frame 87. The cam 105 is fixed in the middle of the third pin 103 in the axial direction and rotates integrally with the third pin 103. The cam 105 has a substantially rectangular shape. When the longitudinal direction of the cam 105 is directed to the horizontal direction as shown in FIG. 11, the lock state is set, and in this state, the cam 105 prevents the leg portion 83 from changing from the deployed posture to the retracted posture. When the longitudinal direction of the cam 105 is turned in the vertical direction, the lock is released, and in this state, the leg portion 83 can freely change between the deployed posture and the retracted posture.

The second elastic member 107 is arranged between the frame 87 and the handle portion. The second elastic member 107 is configured as a coil spring, and the third pin 103 is inserted therein. As shown in FIG. 13 and the like, the stop plate 109 is fixed to the end of the third pin 103 on the side opposite to the handle portion. The stop plate 109 can rotate integrally with the third pin 103, and can move in the axial direction integrally with the third pin 103. A protrusion 111 is provided on the stop plate 109, and a hole 113 is formed in the frame 87 corresponding to the protrusion 111. The protrusion 111 can enter the hole 113 at the phase in which the cam 105 is in the locked state shown in FIG. The second elastic member 107 applies a force in the direction of inserting the protrusion 111 into the hole 113 to the third pin 103.

When the cam 105 is in the locked state shown in FIG. 11, the third pin 103 and the cam 105 cannot rotate because the protrusion 111 is inserted into the hole 113. When switching the locked cam 105 to the unlocked state, the operator pushes the handle portion in the axial direction of the third pin 103 against the second elastic member 107, and the protrusion 111 of the stop plate 109 is formed into the hole 113. Pull out from. This makes the third pin 103 and the cam 105 rotatable. By rotating the cam 105 together with the handle portion by about 90 ° in that state, the cam 105 can be unlocked. In this state, the legs 83 can be opened and closed. When the support stand 17 is not in use, the legs 83 can be placed in the retracted posture for transporting, storing, and the like in a compact state.

When switching the cam 105 in the unlocked state to the locked state, the operator sets the leg portion 83 in the unfolded posture in advance. Next, the operator rotates the handle portion by about 90 °. When the protrusion 111 of the stop plate 109 coincides with the position of the hole 113, the protrusion 111 is inserted into the hole 113 by the force of the second elastic member 107. As a result, the third pin 103 and the cam 105 cannot rotate. In this phase, the cam 105 is in the locked state shown in FIG. 11, so that the leg 83 does not unintentionally change to the retracted posture.

Next, an example of how to use the hanging tool 1 will be described with reference to FIGS. 1, 2, and 14. FIG. 14 is a diagram showing a state in which the arm metal 3 is lifted by using the hanging tool 1.

When the hanging tool 1 is used, the leg 83 of the support stand 17 is changed from the retracted posture to the deployed posture in advance, and the leg lock tool 101 is locked. After installing the support stand 17 on the ground, the clamp portion 11 is attached to the support stand 17. The clamp portion 11 is fixed to the support stand 17 by moving the first pin 41 and the second pin 43 to the locked position.

Next, the clamp portion 11 holds the arm metal 3. Specifically, as shown in FIG. 1, the operator inserts the longitudinal portion of the arm 3 into the internal space 31 of the clamp portion 11. In this state, the operator pushes the lifting portion 13 toward the clamp portion 11 (downward) against the pushing force of the first elastic member 55. As a result, the clutch portion 15 is in a connected state in which the rotation of the lifting portion 13 can be transmitted to the screw shaft 51.

The operator rotates the lifting portion 13 (in other words, the rotary cylinder 53) while pushing it downward. As a result, the screw shaft 51 is screw-moved, so that the pressing member 27 of the clamp portion 11 can be lowered to clamp the arm metal 3.

The operator clamps the lifting portion 13 with an appropriate strength by the pressing member 27, and then releases the pushing of the lifting portion 13 downward. With the release of the push-in, the rotary cylinder 53 is pushed up by the first elastic member 55. Therefore, the clutch portion 15 returns to the shutoff state in which the rotation of the lifting portion 13 is not transmitted to the screw shaft 51.

Next, as shown in FIG. 2, the insulator 5 is attached to the arm metal 3 held by the clamp portion 11. The arm 3 is held at a position above the installation surface of the support stand 17 by a predetermined height by the support stand 17 in a self-standing state. Therefore, since a wide work space can be easily secured around the arm metal 3, the work of attaching the insulator 5 to the arm metal 3 can be smoothly performed.

When the insulator 5 is attached to the arm metal 3, the clutch portion 15 is in the disengaged state. Therefore, even if the operator unintentionally touches the lifting portion 13 and the rotary cylinder 53 during the work on the arm metal 3, the rotary cylinder 53 only idles with respect to the screw shaft 51. Therefore, the clamp of the pressing member 27 with respect to the arm metal 3 is not unintentionally strengthened or weakened.

Next, the operator hooks the hook fixed to the lifting rope 47 of the lifting device 7 to the opening 49 of the lifting portion 13. Next, the operator moves the first pin 41 and the second pin 43 of the clamp portion 11 to an unlocked position where the clamp portion 11 can be separated from the support stand 17.

Finally, the lifting portion 13 is lifted by the lifting device 7. As a result, as shown in FIG. 14, the clamp portion 11 is disengaged from the support stand 17, and the clamp portion 11 is lifted together with the lifting portion 13. The support stand 17 separated from the clamp portion 11 is kept in a state of being placed on the installation surface. As shown by the chain line in FIG. 14, the arm metal 3 is fixed at an appropriate place on the upper part of the support column 9 in a state of being lifted to an appropriate height.

When the lifting portion 13 is lifted, the lifting portion 13 may rotate with respect to the clamp portion 11 due to twisting of the lifting rope 47 or the like. However, since the clutch portion 15 is in the disengaged state, even if the lifting portion 13 rotates, the rotary cylinder 53 only idles with respect to the screw shaft 51. Therefore, the clamp of the pressing member 27 on the arm 3 is not released unintentionally. In this way, the arm 3 can be lifted while reliably maintaining the clamped state.

When the lifting tool 1 of the present embodiment is used, the clutch portion 15 is kept in the disengaged state unless the lifting portion 13 is pushed down with respect to the clamp portion 11. In this way, since the clutch portion 15 is in a disengaged state in principle, the lifting portion 13 is rotated while being pushed down, and once the arm metal 3 is clamped in the clamp portion 11, the clamped state is released by releasing the force. Can be maintained. As described above, the hanging tool 1 can substantially lock the clamped state without any special operation, and is excellent in convenience.

As described above, the lifting tool 1 of the present embodiment is used for lifting a pillar-mounted object including the arm metal 3. The lifting tool 1 includes a clamp portion 11, a lifting portion 13, and a clutch portion 15. The clamp portion 11 clamps the arm metal 3. The lifting portion 13 can be connected to the lifting device 7. The clutch portion 15 is provided between the clamp portion 11 and the lifting portion 13. The clamp portion 11 includes a pressing member 27 capable of pressing / releasing the arm metal 3 by rotating the screw shaft 51. The clutch portion 15 includes a screw shaft 51 that can be raised and lowered with respect to the lifting portion 13 below the lifting portion 13. In the state of FIG. 8 in which the distance L1 between the screw shaft 51 and the lifting portion 13 is long, the clutch portion 15 is in a cutoff state in which the rotation of the lifting portion 13 is not transmitted to the screw shaft 51. In the states of FIGS. 9 and 10 in which the distance L1 between the screw shaft 51 and the lifting portion 13 is short, the clutch portion 15 is in a connected state in which the rotation of the lifting portion 13 is transmitted to the screw shaft 51. When the lifting portion 13 is lifted by the lifting device 7, the distance L1 between the screw shaft 51 and the lifting portion 13 becomes long due to the gravity acting on the screw shaft 51, the clamp portion 11, and the like.

With this configuration, when the lifting portion 13 is lifted by the lifting device 7, the distance between the screw shaft 51 and the lifting portion 13 becomes long. Therefore, since the clutch portion 15 is automatically shut off, the rotation of the lifting portion 13 is not transmitted to the screw shaft 51. As a result, it is possible to prevent the clamp of the arm metal 3 from being unintentionally released at the time of lifting.

Further, the lifting tool 1 of the present embodiment includes a first elastic member 55 that applies an elastic force in a direction that increases the distance L1 between the screw shaft 51 and the lifting portion 13.

As a result, when the lifting portion 13 is lifted, the clutch portion 15 can be reliably shut off.

Further, in the lifting tool 1 of the present embodiment, the elastic force of the first elastic member 55 is as shown in FIG. 8 against the weight of the lifting portion 13 in a state where the lifting portion 13 is not connected to the lifting device 7. The size is such that the clutch portion 15 can be pushed up to shut off the clutch portion 15.

As a result, the clutch portion 15 can be maintained in the disengaged state even before the lifting tool 1 is lifted.

Further, in the suspension tool 1 of the present embodiment, the clutch portion 15 includes a rotary cylinder 53. The rotary cylinder 53 rotates integrally with the lifting portion 13 about a rotation axis in the vertical direction. The rotary cylinder 53 is provided with a protrusion 79. A first groove portion 71 and a second groove portion 73 are formed on the screw shaft 51. The first groove portion 71 is formed as an annular groove in which the inserted protrusion 79 can move in the circumferential direction. The second groove portion 73 is connected to the first groove portion 71. The second groove portion 73 prevents the inserted protrusion 79 from moving in the circumferential direction. When the protrusion 79 enters the first groove portion 71, the clutch portion 15 is in a disengaged state. When the protrusion 79 enters the second groove portion 73, the clutch portion 15 is in the connected state.

As a result, the clutch portion 15 having a simple and compact configuration can be realized.

Further, in the suspension tool 1 of the present embodiment, the clamp portion 11 is formed in a C shape.

As a result, the clamp portion 11 having a simple and lightweight configuration can be realized.

Further, the suspension tool 1 of the present embodiment is provided with a support stand 17 that is detachably attached to the clamp portion 11 and supports the clamp portion 11 above the ground plane.

This facilitates work such as attaching the insulator 5 to the arm metal 3. Further, after the work is completed, the lifting tool 1 can be lifted together with the arm metal 3 by a simple work.

The suspension tool 1 of the present embodiment includes a first pin 41 and a second pin 43 that lock the clamp portion 11 while being mounted on the support stand 17.

As a result, the clamp portion 11 can be prevented from being unintentionally disengaged from the support stand 17.

In the suspension tool 1 of the present embodiment, the support stand 17 includes a plurality of legs 83 that can be opened and closed.

As a result, the support stand 17 can be compactly stored when the suspension tool 1 is not used.

In the present embodiment, the pillars including the arm metal are lifted by the lifting method including the clamping step and the lifting step. In the clamping process, the clutch portion 15 is rotated by the lifting portion 13 by setting the distance L1 between the lifting portion 13 and the screw shaft 51 that can be raised and lowered with respect to the lifting portion 13 below the lifting portion 13 to be short. Is transmitted to the screw shaft 51 in a connected state. In the clamping step, in this connected state, the screw shaft 51 is rotated together with the lifting portion 13, and the arm metal 3 is clamped by the pressing member 27. In the lifting process, by lifting the lifting portion 13 with the lifting device 7, the distance L1 between the screw shaft 51 and the lifting portion 13 is set to be long due to the gravity acting on the screw shaft 51 and the like, and the clutch portion 15 is accompanied by this. Is in a cutoff state in which the rotation of the lifting portion 13 is not transmitted to the screw shaft 51.

In this method, in the lifting process in which the lifting portion 13 is lifted by the lifting device 7, the distance L1 between the screw shaft 51 and the lifting portion 13 becomes long. Therefore, since the clutch portion 15 is automatically shut off, the rotation of the lifting portion 13 is not transmitted to the screw shaft 51. As a result, it is possible to prevent the clamp of the arm metal 3 from being unintentionally released at the time of lifting.

Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

The clamp portion 11 is not particularly limited as long as it can accommodate a part of the arm metal 3 in the internal space 31 through the arm metal 3. For example, the clamp portion 11 may be provided with a member that can open and close the front of the internal space 31. The clamp portion 11 may be configured to be able to clamp the arm 3 in the horizontal direction instead of the vertical direction.

The configuration of the lifting portion 13 is not particularly limited, and for example, it may be configured in a hook shape instead of a ring shape.

The clutch portion 15 is provided with a first groove portion 71 and a second groove portion 73 on the screw shaft 51, and instead of providing the protrusion 79 on the rotary cylinder 53, the screw shaft 51 is provided with a protrusion and the protrusion is provided on the rotary cylinder 53. A first groove portion and a second groove portion corresponding to the above may be provided.

The configuration of the clutch portion 15 is also arbitrary. For example, the clutch function may be realized by forming teeth that mesh with each other in the vertical direction on the rotary cylinder 53 and the screw shaft 51.

For clamping / unclamping the arm 3 by the clamp portion 11, the operator can push the lifting portion 13 downward by hand to rotate it, or push it downward using a tool shown in the figure to rotate it. You can also.

The first elastic member 55 can be omitted. Even in this case, the clutch portion 15 can be in the disengaged state at the time of lifting shown by the chain line in FIG.

The support stand 17 may be configured so that the legs 83 cannot be closed.

In the hanging tool 1, the first pin 41 and the second pin 43 can be omitted. The support stand 17 and the mounting portion 29 may be omitted.

In view of the above teachings, it is clear that the present invention can take many modified and modified forms. Therefore, it should be understood that the invention may be practiced in ways other than those described herein, within the scope of the appended claims.

1 Suspension tool 3 Arm metal 7 Suspension device 11 Clamp part 13 Lifting part 15 Clutch part 17 Support stand (support part)
27 Pressing member 51 Screw shaft (elevating member)
53 Rotating cylinder (rotating input member)
55 First elastic member (elastic member)
71 1st groove (1st recess)
73 Second groove (second recess)
79 Protrusion 83 Leg L1 Distance

Claims (9)

A hanging tool used to lift pillars including arms.
A clamp portion for clamping the arm and a clamp portion
A lifting part that can be connected to a lifting device,
A clutch portion provided between the clamp portion and the lifting portion,
Equipped with
The clamp portion includes a pressing member capable of pressing / releasing the arm metal by rotating the screw shaft.
The clutch portion includes an elevating member that can be raised and lowered with respect to the lifting portion below the lifting portion.
When the distance between the elevating member and the lifting portion is long, the clutch portion is in a shutoff state in which the rotation of the lifting portion is not transmitted to the screw shaft.
When the distance between the elevating member and the lifting portion is short, the clutch portion is in a connected state in which the rotation of the lifting portion is transmitted to the screw shaft.
A lifting tool characterized in that when the lifting portion is lifted by the lifting device, the distance between the lifting member and the lifting portion becomes long due to gravity. The hanging tool according to claim 1.
A lifting tool comprising an elastic member that applies an elastic force in a direction that increases the distance between the lifting member and the lifting portion. The hanging tool according to claim 2.
The elastic force of the elastic member can push up the lifting portion against the weight of the lifting portion in a state where the lifting portion is not connected to the lifting device to bring the clutch portion into the disengaged state. A hanging tool characterized by its large size. The hanging tool according to any one of claims 1 to 3.
The clutch portion includes a rotation input member that rotates about a rotation axis in the vertical direction integrally with the lifting portion.
A protrusion is provided on one of the rotation input member and the elevating member.
On the other side of the rotation input member and the elevating member,
The first recess formed by the inserted protrusion as an annular groove that can move in the circumferential direction,
A second recess that is connected to the first recess and prevents the inserted protrusion from moving in the circumferential direction.
Is formed,
When the protrusion enters the first recess, the clutch portion is in the disengaged state.
A hanging tool characterized in that the clutch portion is in the connected state when the protrusion enters the second recess. The hanging tool according to any one of claims 1 to 4.
A hanging tool characterized in that the clamp portion is formed in a C shape. The hanging tool according to any one of claims 1 to 5.
A hanging tool that is detachably attached to the clamp portion and is provided with a support portion that supports the clamp portion above the ground plane. The hanging tool according to claim 6.
A hanging tool including a locking portion that locks the clamp portion while being mounted on the support portion. The hanging tool according to claim 6 or 7.
The support portion is a hanging tool including a plurality of legs that can be opened and closed. A clamp portion for clamping the arm with a pressing member capable of pressing / releasing the arm as the screw shaft rotates, and
A lifting part that can be connected to a lifting device,
A clutch portion provided between the clamp portion and the lifting portion,
It is a lifting method for lifting a pillared object including an arm using a hanging tool equipped with.
By setting the distance between the lifting portion and the lifting member that can be lifted and lowered with respect to the lifting portion below the lifting portion to be short, the rotation of the lifting portion is transmitted to the screw shaft through the clutch portion. As a connection state, the screw shaft is rotated together with the lifting portion, and the arm metal is clamped by the pressing member.
By lifting the lifting portion with the lifting device, the distance between the lifting member and the lifting portion becomes long due to gravity, and accordingly, the clutch portion and the rotation of the lifting portion move to the screw shaft. The suspension process, which is in a cut-off state where transmission is not transmitted,
A lifting method characterized by including.

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