WO1994026647A1

WO1994026647A1 - Apparatus for removing large-weight object lifting members

Info

Publication number: WO1994026647A1
Application number: PCT/JP1994/000689
Authority: WO
Inventors: Seiichiro Takai
Original assignee: Totetu Mfg. Co., Ltd.
Priority date: 1993-05-10
Filing date: 1994-04-26
Publication date: 1994-11-24
Also published as: BR9405361A; CA2139939A1; RU2110468C1; EP0650919A4; EP0650919B1; CA2139939C; RU95106038A; AU6582094A; CN1110874A; DE69421239D1; EP0650919A1; DE69421239T2; JPH0725578A; CN1048469C

Abstract

Upper wires (28) are provided between a base (12) and the hook (31a) of a crane (31), and lower wires (32) the base end portions of which are secured to the base are engaged with lifting member locking portions (11a) of a large-weight object (11), rings (32a) at the upper ends of the lower wires (32) being fitted around a mast (17) provided upright on the base. A slider (18) fitted slidably around the mast is pushed up by a first resilient member so that the upper end of the slider is flush with at least that of the mast in a no-load condition a slider lowering means (33) overcoming the resilient force of the first resilient member to lower the slider. A locking means temporarily fixes the slider lowering means with the slider in a lowered state, and an unlocking means disengages the locking means. The lower lifting members can be removed automatically from the large-weight object lowered to a predetermined place. A large-weight object of any shape can be lifted and lowered to a predetermined place without damaging the tension members, and an operation for hanging tension members on a hook of a crane becomes unnecessary.

Description

Description Heavy lifting material removal equipment Technical field

The present invention relates to a device for removing a lifting material such as a wire, a cable, a lobe, and a chain from which a heavy object is lifted.

Background art

When a heavy load of construction materials is lifted down by a crane using a lifting material such as a wire in construction work or civil engineering work, the wire engaged with the heavy load is usually removed manually. You.

On the other hand, if the specified location is underwater and workers cannot easily go to that location, such as when a breakwater or seawall is newly constructed or renovated, the wire should be heavy, for example, a net cage packed with stone. And left in that place (eg, Japanese Patent Publication No. 51-123).

If a large number of heavy objects such as net cages packed with stones are placed on the shore or jetty in the above work, the installation of wires with a unit price of about 10,000 yen per heavy object is a construction cost. Divers remove the wire in the sea to push up the water, but the removal work was not easy depending on weather conditions and the installation condition of heavy objects, and improvement was desired.

In order to solve these problems, the applicant has proposed that an upper lifting member is provided between a base and a hook of a crane, and a lower lifting member having a base end attached to the base is a lifting member engaging portion of a heavy object. The ring at the tip is engaged with the mast erected on the base, and the slider fitted slidably on the mast is elastic so that its upper end at least matches the upper end of the mast under no load. A patent application has been filed for a heavy lifting material removal device which is configured so that the slider lowering means overcomes the elastic force of the elastic body and lowers the slider in a state where the slider is lifted and the base is lifted (Japanese Patent Laid-Open No. — 7 3 9 8 6). If the slider lowering means is a pair suspended from the slider via a suspension, the lifted heavy object lands at a predetermined place, the weight is placed on the heavy object, and the base is further moved to a predetermined position. When descending by a distance, all the rings at the tip of the lower lifting material that had been fitted into the mast will fall out of the mast. When the base is raised by the crane in this state, the lower lifting material comes off the lifting material engaging portion of the heavy object. As a result, heavy objects can be installed using crane even in places where workers cannot be allocated for safety and hygiene.

Also, a constant pulley provided with a slider lowering means on a base, a tension member having one end attached to the slider through the pulley, and a lily having the other end of the tension member engaged with a hook of the crane and detachably formed. If the other end of the tendon is released from the releaser at a desired position before the heavy object lands, the heavy object lands at a predetermined location, and the base is placed on the heavy object. All of the rings at the tip of the lower lifting material come off the mast before contact.

However, in the above-described conventional detaching device, the suspension member and the tension member may be damaged because the suspension member and the tension member are relatively long and exposed.

In addition, in the removal device using the weight, when the heavy object is not flat, such as a tetrapot, when the heavy object is lowered to a predetermined position, the weight is not put on the heavy object in a stable state. There is fear.

Furthermore, in the above-mentioned detaching device using a releaser, the tendon material released from the releaser in order to lower the heavy object to a predetermined place must be locked to the releaser again when lifting another heavy object. a first object of the work is relatively troublesome a problem was _c present invention automatically remove the lower hoisting member had engaged with the heavy when lower the heavy in place from heavy It is an object of the present invention to provide an apparatus for removing heavy lifting materials which can be used.

A second object of the present invention is that a heavy object of any shape can be lifted and lowered to a predetermined place without damaging the tendon, and the work of locking the tendon to the hook of the crane can be performed. We will provide a device for removing heavy lifting materials that is no longer needed. Disclosure of the invention

The configuration of the present invention for achieving the above object will be described with reference to FIGS. 1, 2 and 7 corresponding to the embodiment.

The present invention is an apparatus for removing a lower lifting member 32 engaged with a heavy object 11 having a lifting member engaging portion 11a from the heavy object 11.

This detaching device is composed of a base 12, an upper lifting material 28 whose base end is attached to the base 12 and whose tip can be locked to the hook 31 a of the crane 31, and an erecting base mounted on the base 12. Mast 17 and a ring 32 a whose base end is attached to base 12 and whose tip can be fitted into mast 17, and is associated with lifting material engaging portion 11 a of heavy load 11. Lower lifting material 3 2, slider 18 that can be moved up and down on mast 17, and slider 18 with no load pushed up so that the upper end at least matches the upper end of mast 17 The first elastic body 21, the slider lowering means 33 for lowering the slider 18 by overcoming the elastic force of the first elastic body 21, and the slider lowering means 33 temporarily when the slider 18 is lowered There are provided a lock means 43 for fixing the lock and a lock release means 55 for releasing the lock means 43.

Using the upper lifting material 28, the base 12 and the lower lifting material 32, lower the heavy object 11 lifted by the crane 3 1 to the specified place, then release the locking means 4 3 by the unlocking means 5 5 Then, the slider lowering means 33 becomes inactive. As a result, the slider 18 is pushed up to at least the upper end of the mast 17 by the elastic force of the first elastic body 21, so that the ring 3 2 at the tip of the lower lifting material 3 2 fitted into the mast 17 a comes off the mast 17. In this state, when the base 12 is lifted by the crane 31, the lower lifting material 32 comes off the lifting material engaging portion 11 a of the heavy load 11 and separates from the heavy load 11.

If the lock means 43 is released by the lock release means 55 before the heavy load 11 is lowered to the predetermined place, the slider lowering means 33 becomes inoperable. Since the ring 3 2a of the lower lifting member 32 on which the load of 11 is applied is fitted, the slider 18 is held in a lowered state. As a result, when the heavy object 11 is lowered to a predetermined position, the slider 18 Since the elastic force of the body 21 pushes up to the upper end of the mast 17, the ring 3 2 a of the lower lifting material 3 2 fitted into the mast 17 comes off from the mast 17.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view of an essential part showing a state in which a heavy object is lifted by a crane via a device for removing a heavy object lifting material according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 showing a state in which the slider lowering means of the detaching device is inoperative and the slider is lifted.

FIG. 3 is a cross-sectional view corresponding to FIG. 2, showing a state where the slider lowering means operates and the slider is lowered.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a cross-sectional view taken along line CC of FIG.

FIG. 6 is a sectional view taken along line DD of FIG.

FIG. 7 is an enlarged perspective view of a portion E in FIG.

FIG. 8 is a configuration diagram of remote control means for remotely controlling the arm holder.

FIG. 9 is an enlarged cross-sectional view of a portion E in FIG. 2 showing a state in which the flexible bar is locked to the mouthpiece.

Fig. 10 is a cross-sectional view corresponding to Fig. 9 showing a state in which the arm rotates in a direction to release the locking of the swivel bar to the mouthpiece, and immediately before the mouthpiece descends. 0

FIG. 11 is a cross-sectional view corresponding to FIG. 9 showing a state in which the mouthpiece is being lowered.

FIG. 12 is a cross-sectional view corresponding to FIG. 9, showing a state where the member to be closed has been lowered to the lowermost end.

FIG. 13 is a main part front view showing a state in which the base is placed on a heavy object to be lifted from now on, and the ring at the tip of the lower lifting member is fitted into the mast.

FIG. 14 is a front view corresponding to FIG. 13 and showing a state in which the heavy object is lifted by a crane via the removing device.

FIG. 15 corresponds to FIG. 13 showing a state where the heavy object has landed at a predetermined place. FIG.

FIG. 16 is a front view corresponding to FIG. 13 showing a state in which the lock device is released by the lock release means, and the ring at the tip of the lower lifting material in which the slider has been fitted into the mast is removed from the mast.

FIG. 17 is a front view corresponding to FIG. 13 showing a state in which the removal device is lifted by a crane and a lower lifting member is pulled out from a lifting member engaging portion of a heavy object.

FIG. 18 is a perspective view corresponding to FIG. 7 and showing a state in which the adjustable bar according to the second embodiment of the present invention is locked to the mouthpiece.

FIG. 19 is a perspective view corresponding to FIG. 19, showing a state in which the arm rotates in the direction of releasing the locking of the free bar to the locked member and immediately before the locked member descends. .

FIG. 20 is a cross-sectional view corresponding to FIG. 7, showing a state in which the lock pin according to the third embodiment of the present invention is inserted into the through hole of the member to be closed.

FIG. 21 is a sectional view taken along line FF of FIG.

FIG. 22 is a cross-sectional view corresponding to FIG. 21, showing a state where the lock pin is pulled out of the through-hole of the mouthpiece.

FIG. 23 is a sectional view taken along line GG of FIG. 24 showing a state in which the slider lowering means of the fourth embodiment of the present invention is operated and the slider is lowered.

FIG. 24 is a sectional view taken along line HH of FIG.

FIG. 25 is a perspective view of a main part showing a state where a heavy object is lifted by a crane via the heavy lifting material removing device.

FIG. 26 is a cross-sectional view corresponding to FIG. 23, showing a state where the heavy object is lifted by a crane via the removing device.

FIG. 27 is a cross-sectional view corresponding to FIG. 23, showing a state in which the lock device is released by the lock release means, and the slider at the tip of the lower lifting member, into which the slider has been fitted, has been pulled out of the mast. BEST MODE FOR CARRYING OUT THE INVENTION

Next, a first embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 12, in this example, the heavy object 11 is a concrete block, and an inverted U-shaped wire engaging portion 11a is fixed to the upper surface at the center of both edges. The lifting material removal device includes a base 12 having a large T-shaped hole 12a formed in the center (FIGS. 1 to 4). The base 12 is composed of a pair of plates 13 and 13 formed by cutting a steel plate into a substantially rectangular shape, and both side edges of the plate 13 for joining the plates 13 and 13 at a predetermined interval. And a lower block 16 arranged in the center of the lower edge of the plate 13. The plates 13 and 13 are joined by welding via sides 14 and 14 and a lower block 16.

In the center of the pair of plates 13 and 13, large T-shaped large holes 12a and 12a are formed so as to face each other, and through holes 13 are formed at the left and right corners of the upper end of the plate 13. a, 13a are formed. A through hole 12b is formed in the center of the lower surface of the base 12 in a vertical direction toward the large-diameter hole 12a, and a lower portion of a cylindrical mast 17 is inserted and welded into the through hole 12b. . The mast 17 is erected on the base 12 so as to protrude into the large-diameter hole 12a. The mast 17 has a lower large-diameter portion 17a and an upper small-diameter portion 17b facing the large-diameter hole 12a. A first elastic body 21 is loosely fitted to the mast 17, and a small-diameter portion 17a of the mast 17 is fitted with a blade-shaped slider 18 slidable on the small-diameter portion 17a. At both ends of the slider 18, a pair of guide portions 18a, 18a slidably protruding between the pair of blades 13, 13 respectively, and a slider 18 is provided between the pair of plates 13, 13 from the mast 17. A pair of stoppers 19 and 19 for preventing the stoppers from coming off are fixed by the knock bin 23. The first elastic body 21 is a compression coil spring in this example. When the slider 18 is urged by the first elastic body 21 and the upper surface of the slider 18 slightly projects from the upper end of the mast 17, the guide portion 18a of the slider 18 comes into contact with the stopper 19 (see FIG. 2) Flanges 24, 24 extending substantially horizontally across the lower portions of the large-diameter holes 12a, 12a are welded to the surfaces of the pair of plates 13, 13, respectively. A pair of shackle holders 26, 26 are vertically welded to the center of the surface and the surface of the plate 13, respectively. The shirt hole holder 26 has a mounting hole 26a in which the shirt circle 27 can be loosely formed (FIGS. 1 and 4).

—Bolts 29, 29 into which the base ends of the pair of upper wires 28, 28 are inserted, are passed through the through holes 13a, 13a formed in the pair of plates 13, 13 (Figs. 2 and 3). A nut (not shown) is screwed into the bolt 29. The tip of the upper pin 28 is engaged with the hook 31a of the crane 31 (FIG. 1). The base end of the lower wire 32 is fitted into the shackle 27, and the shackle 27 is loosely inserted into the mounting hole 26a of the shirtcle holder 26 (FIGS. 1 and 4). A ring 32a that can be fitted into the mast 17 is formed at the tip of the lower wire 32 (FIGS. 1 and 3).

The base 12 has slider lowering means 33 (FIGS. 1, 2, 3, and 5) for lowering the slider 18 by overcoming the elastic force of the first elastic body 21. Locking means 43 for temporarily fixing the descending means 33 and unlocking means 55 for releasing the locking means 43 are provided (FIGS. 2 to 4 and FIGS. 7 to 12).

As shown in detail in FIGS. 2, 3 and 5, the slider lowering means 33 is a sensor rod 34 made of an inverted U-shaped steel plate which is vertically movably inserted into the base 12 and has a lower end protruding downward from the lower surface of the base 12. A movable pulley 41 rotatably mounted on the sensor rod 34; a fixed pulley 42 rotatably mounted on the base 12; and a movable pulley 41 mounted on the base 12 at one end and mounted on the slider 18 at the other end. And a tendon 36 routed via a constant pulley 42. The sensor rod 34 has a pair of legs 34a, 34a and a connecting portion 34b that connects the upper ends of the legs 34a, 34a. The lower ends of the pair of legs 34 a, 34 a project downward from the lower surface of the base 12 by the weight of the sensor rod 34 when the base 12 is lifted. The movable pulleys 41, 41 are attached to the centers of the pair of legs 34a, 34a, respectively, and a plate member 34c is hung over the lower ends of the pair of legs 34a, 34a, and bolts 34d and The nut 34e is fixed to the legs 34a, 34a, respectively (Fig. 4). Mast 1 protruding from lower block 16 The constant pulleys 4 2 and 4 2 are respectively mounted between a pair of blades 13 and 13 on both sides of the large-diameter portion 17 a of 7. The tendon 36 is a wire in this example, and when the leg 34 a of the sensor rod 34 is pushed into the base 12, the slider 18 moves against the elastic force of the first elastic body 21. It is arranged to descend. When the base 12 is lowered onto the heavy load 11, the leg 34 a of the sensor rod 34 overcomes the elastic force of the first elastic body 21 by the weight of the base 12. It has a mass that pushes it into the base 12 and lowers the slider 18.

As shown in detail in FIGS. 4, 7 and 9 to 12, the locking means 43 is integrally erected at the center of the connecting part 34b of the sensor rod 34, and is upward from the upper surface of the base 12. And a flat member having a long hole 46a that is loosely fitted in the locked member 44 and extends in the width direction of the locked member 44. And a flexible bar 46 formed in a bar shape. A box 47 having a lid 48 is attached to the upper surface of the base 12 with bolts 49 (FIG. 4), and the locked member 44 projects into the box 47. A roller 50 is rotatably attached to the upper end of the locked member 44, and the upper portion of the locked member 44 is formed to be narrower than the lower portion. The elongated hole 46a is formed substantially at the center of the universal bar 46 and extends in the longitudinal direction of the bar 46, and its length is formed slightly longer than the width of the lower part of the locked member 44.

The base end of the swivel bar 46 is provided with a mounting hole 46 b formed in a long hole extending in the longitudinal direction of the bar 46 and opened substantially in the horizontal direction, and the swivel bar 46 is fixed to the box 47. By inserting a pin 52 into the upper end of the substantially J-shaped bracket 51 and the mounting hole 46b, it is attached to the box 47 so as to be rotatable in the vertical plane and slidable in the longitudinal direction. . When the adjustable bar 46 is at a predetermined angle, the locked member 44 is configured to be locked in the elongated hole 46a. In other words, the swivel bar 46 rotates around the bin 52 and moves in the longitudinal direction, and the width of the lower end of the swivel member 4 4 is formed at both edges of the elongated hole 46 a of the swivel bar 46. When the both ends of the sensor rod 34 are locked, the locked member 44 is temporarily moved in a state where the leg 34 a of the sensor rod 34 is pushed into the base 12, that is, the slider 18 is lowered. Is fixed. At the end of the universal bar 4 6 is a universal bar 4 An adjusting bolt 53 for adjusting the locking angle of 6 is screwed in, and the bolt 53 is fixed by a lock nut 54.

As shown in detail in FIGS. 7 and 9 to 12, the lock release means 55 is a second elastic body 2 for urging the arm 57 in a direction to release the locked member 44 from the flexible bar 46. 2 and the arm 57 is held against the elastic force of the second elastic body 22 during operation, the locked member 44 is locked to the free bar 46, and the arm 57 is released when not operated. An arm holder 58 for releasing the mouthpiece member 44 from the flexible bar 46 is provided. The arm 57 is erected on the bottom surface of the box 47 and is rotatably mounted via a pin 61 to a bracket 59 fixed to the box 47. The roller 50 faces the side edge of the arm 57. On one side of the lower end of the arm 57, a receiving portion 5 7a for receiving the tip of the adjusting bolt 5 3 of the universal bar 46 protrudes, and at the top of the arm 57, a suction plate 62 is provided with a pin 63. It is rotatably mounted via a. The second elastic body 22 is a tension coil spring in this example, and is stretched between the upper end of the bracket 51 and the upper end of the arm 57. The spring 22 urges the arm 57 to rotate in a direction to push up the tip of the free bar 46. The arm holder 58 is attached to the upper part of the inverted L-shaped bracket 64 fixed to the box 47 by a long bolt 66 and a bag nut 67 so as to face the suction plate 62. A compression coil spring 68 is inserted into the. The arm holder 58 is configured to be movable in the direction approaching the bracket 64 against the elastic force of the compression coil spring 68. An electromagnet (not shown) is built into the arm holder 58. When the electromagnet is excited, the attracting plate 62 is attracted by its magnetic force. When the electromagnet is demagnetized, the attracting plate is attracted by the elastic force of the second elastic body 22. 6 2 is separated from the arm holder 5 8. The side edge of the arm 57 facing the roller 50 is formed on an inclined surface 57 b approaching the member to be locked 44 as it faces downward, and the inclined surface 57 b contacts the roller 50 and contacts the roller 50. By lowering 50, the arm 57 is rotated in the direction in which the suction plate 62 is pressed against the arm holder 58. As shown in detail in FIG. 8, the arm holder 58 is configured to be remotely operated wirelessly by remote operation means 71. The remote control means 7 1 is composed of a transmitting device 7 2 placed separately from the base 12, and a receiving device 73 provided in the box 47. Is provided. The transmission device 72 includes a switch operation panel 72a, a wireless transmission section 72b electrically connected to the operation panel 72a, and a transmission antenna 72c. The receiving device 73 includes a receiving antenna 73 c, a wireless receiving unit 73 a, and a driving unit 73 b electrically connected to the receiving unit 73 a and controlling the arm holder 58. By turning on and off a switch (not shown) provided on the switch operation panel 72a, the arm holder 58 is switched to an active or inactive state. That is, the wireless transmission section 72b transmits the control signal of the arm holder 58 from the transmission antenna 72c by the switch operation of the switch operation panel 72a. The wireless receiving section 73a receives the transmitted control signal via the receiving antenna 73c, and the driving section 73b controls the arm holder 58 based on the received signal.

A method of using the heavy lifting material removing device thus configured will be described with reference to FIGS. 1 to 3 and FIGS. 9 to 17.

First, the base 12 is lifted by the crane 31 via the upper wire 28 (FIGS. 1 and 2). At this time, the locked member 44 moves down to the lowermost end as shown in FIG. 12, and the roller 50 of the locked member 44 rotates the arm 57 in the direction of the solid line arrow to move the suction plate 62 to the arm holder. Since it is pressed against 58, the switch (not shown) of the switch operation panel 7 2a is turned on, the suction plate 62 is sucked by the arm holder 58, and the arm 57 moves in the direction of the broken arrow. Prevent rotation.

As shown in Fig. 3, when the base 12 is lowered onto the heavy load 11 to engage the lower wire 3 2 with the heavy load 11 to be lifted, the sensor rod 3 4 protruding downward from the lower surface of the base 12 The leg 34 a of the first elastic body 21 is pushed into the base 12, and the slider 18 descends against the elastic force of the first elastic body 21. At this time, the locked member 44 rises as shown in FIG. In this state, as shown in Fig. 13, the lower wire 32 is inserted through the wire engaging portion 11a of the heavy object 11, and then the ring 32a at the tip of the lower wire 32 is fitted into the mast 17. I do.

Next, as shown in Fig. 14, when the heavy object 11 is lifted by the crane 31 via the upper wire 28, the base 12 and the lower wire 32, the heavy bar 11 is drawn into the elongated hole 46a of the universal bar 46. As shown in 9, the locked member 4 4 locks, so the sensor port Head 3 4 does not descend.

Next, as shown in FIG. 15, when the heavy object 11 is lowered to a predetermined place G, the lower wire 32 is loosened. When the switch is turned off in this state, the arm holder 58 stops sucking the suction plate 62, and the arm 57 rotates in the direction indicated by the solid line arrow in FIG. 9 by the elastic force of the second elastic body 22. Then, the inclined surface 57 b of the arm 57 comes into contact with the roller 50 (FIG. 10). At the same time, the arm 57 pushes up the tip of the universal bar 46, so that the locked member 44 is released from the universal bar 46, and the roller 50 starts to descend together with the locked member 44 by its own weight (FIG. 11). ). At this time, the roller 50 rotates the arm 57 in the direction of the dashed arrow while rolling the inclined surface 57b of the arm 57, but the locked member is provided in the elongated hole 46a of the universal bar 46. 4 4 Since the upper narrow part is located, the long hole 46 a of the flexible bar 46 descends to the position shown in Fig. 12 without being locked to the The suction plate 62 is pressed against the arm holder 58. Simultaneously with the lowering of the locked member 44, the slider 18 in the no-load state rises due to the elastic force of the first elastic body 21, so that the ring 3 2a of the lower wire 32 as shown in FIG. Fall off the mast and fall.

Further, as shown in Fig. 17, when the crane wire (not shown) is wound up and the base 12 is lifted, the lower wire 32 is pulled out of the wire engaging portion 11a of the heavy object 11 and the base 1 Raised with 2. In this manner, the lower wire 32 can be automatically removed from the heavy object 11 lowered to the predetermined place G.

Also, even if the heavy object 11 is lowered to the predetermined place G, the heavy object 11 can be lifted again and lowered to another place if the switch is not turned off. When the switch is turned off with the heavy object 11 lifted as shown in the figure, the arm 57 rotates in the direction indicated by the solid line arrow in FIG. , The locked member 44 is released from the universal bar 46, and the locked member 44 descends (FIGS. 10 to 12). At this time, since the ring 3 2a of the lower wire 32 on which the load of the heavy object 11 acts is fitted into the mast 47, the slider 18 is held in a lowered state, and the tension member 36 is Relax. As a result, lower the heavy object 1 1 to the predetermined location G When the load 18 is in a no-load state, the slider 18 is pushed up to the upper end of the mast 17 by the elastic force of the first elastic body 21 and the lower pin 3 fitted in the mast 17 Ring 3 2a comes off the mast 17.

FIGS. 18 and 19 show a second embodiment of the present invention. In FIGS. 18 and 19, the same reference numerals as those in the first embodiment denote the same parts.

The free end of the free bar 86 of the locking means 83 is attached to the substantially U-shaped bracket 81 fixed to the box 47 so as to be rotatable and slidable in the longitudinal direction via the pin 82, and the lock is released. A substantially center of the arm 87 of the means 85 is rotatably attached to a substantially U-shaped bracket 88 fixed to the box 47 via a pin 89. The distal end of the arm 87 opposes the lower surface of the distal end of the universal bar 86, and an operating lobe 91 is attached to the base end of the arm 87. At the approximate center of the adjustable bar 86, an elongated hole 86a is formed that can be loosely fitted to the hooked member 84.

A method of using the heavy lifting material removing device thus configured will be described. Pulling the operating robe 91 in the direction of the solid line arrow in Fig. 18 while the heavy object is lifted or the heavy object is lowered to the specified place, the tip of the arm 87 becomes free. As shown in FIG. 19, the locking of the long hole 86 a of the adjustable bar 86 to the locked member 84 is released, and the locked member 84 descends. The usage other than the above is the same as that of the first embodiment, and the description thereof will not be repeated. FIGS. 20 to 22 show a third embodiment of the present invention. 20 to 22, the same reference numerals as those in the first embodiment denote the same parts.

The locking means 103 is a through-hole 114 formed in a locked member 114 projecting into a box 47 mounted on the upper surface of a base (not shown). A lock bin 106 that can be inserted into 4a is provided. The locked member 114 is provided integrally with the sensor rod 104 and protrudes upward from the upper end of the sensor rod 104. The lock bin 106 is slidably held by a pin holder 107 fixed to the box 47. The through hole 114a is in a state where the legs 104a, 104a of the sensor opening 104 projecting from the lower end of the base are pushed into the base, that is, the locked member 1 14 Most protruding into box 4 7 It is formed at a position facing the lock bin 106 in the state. The lock bin 106 has an insertion portion 106a inserted into the through hole 114a, and a flange portion 106b formed at the rear end of the insertion portion 106a. A third elastic body 108 that urges the lock bin 106 so as to be pushed out toward the locked member 114 is built in the bin holder 107. The third elastic body 108 is a compression coil spring in this example. Reference numeral 104b denotes a connecting portion for connecting the locked member 114 to the legs 104a and 104a.

The lock release means 105 is a means for pulling out the lock bin 106 inserted in the through hole 114a from the hole 114a, and is provided on the upper surface of the bin holder 107 in the longitudinal direction. An extended guide hole 107a, an operation pin 109 fixed to the lock pin 106 and protruding upward from the guide hole 107a, and a substantially center in the operation bin 109 An operation bar 1 1 1 for locking is provided. A locking hole 111a extending in the longitudinal direction is formed substantially at the center of the operation bar 111, and the locking hole 111a is loosely fitted to the operation bin 109. The base end of the operation bar 111 is rotatably attached to the box 47 via the bin 112, and an operation lobe 113 is attached to the tip of the operation bar 111.

A method of using the heavy lifting material removing device thus configured will be described. Pulling the operating lobe 1 1 3 in the direction of the solid arrow in Fig. 20 with the heavy object lifted or the heavy object lowered into the specified place, the operation bar 1 1 1 is centered on the bin 1 1 2 Then, since the lock bin 106 is pulled out from the through hole 114a in the direction of the dashed arrow (FIG. 22), the locked member 114 is lowered. The usage other than the above is the same as that of the first embodiment, and the repeated description is omitted.

FIG. 23 to FIG. 27 show a fourth embodiment of the present invention. 23 to 27, the same reference numerals as those in the first embodiment denote the same parts.

In this example, four inverted U-shaped wire engaging portions 211a are fixed near the four corners on the upper surface of the heavy object 211 (FIG. 25). The base 2 1 2 is a base frame 2 13 formed of an H-shaped steel in a substantially rectangular frame shape, a box-shaped base body 2 14 fixed to the center of the upper surface of the base frame 2 13, and a base body A reverse cross-section, which is fixed to substantially the center of the lower surface of 2 14 and has a flexible bar 2 4 6 A bar-shaped bar mounting base 2 15 and a fixed pulley 4 2 of slider lowering means 2 3 3 fixed to the lower surface of the bar mounting base 2 15 And The base body 214 is erected between the two reinforcing members 21a and 21a fixed to the base body 214 so as to be positioned parallel to each other in the base frame 213. The two reinforcing members 2 1 3 a and 2 13 a are made of H-shaped steel ^> o

At the center of the base body 214, a cylindrical mast 217 is erected. The mast 2 17 has a large-diameter portion 2 17 a inserted into the base body 2 14 and welded to the base body 2 14, and a small-diameter portion 2 17 b protruding above the base body 2 14. It has. After the first elastic body 221 is loosely fitted into the small diameter portion 217b, the slider 218 having a substantially truncated cone shape is vertically movably fitted. A boss 218a protrudes from the lower surface of the slider 218, and a long groove 217c extending vertically from near the upper end to the center of the small diameter portion 217b is formed. Boss 218a is screwed into bolt 219a by force, and the tip is loosely inserted into long groove 217c (Fig. 24). O Slider 218 is masted by this bolt 218. To prevent it from rotating and from falling out of the mast 217. The first elastic body 222 is a compression coil spring in this example. In addition, a vertical hole 217d extending upward from the lower surface is formed in the large diameter portion 217a of the mast 217.

The base 2 12 has slider lowering means 2 3 3 for lowering the slider 2 18 by overcoming the elastic force of the first elastic body 2 21, and slider lowering means 2 3 when the slider 2 18 is lowered. Lock means 243 for temporarily fixing 3 and lock release means 255 for releasing the lock means 243 are provided (FIGS. 23, 24, 26 and 27). The slider lowering means 2 3 3 has the upper end loosely inserted into the vertical hole 2 17 d of the mast 2 17 through the bar mounting base 2 15 and the pulley mounting base 2 16 and the lower end from the lower surface of the pulley mounting base 2 16 A sensor rod 2 3 4 protruding downward, a moving pulley 4 1 rotatably mounted substantially at the center of the sensor rod 2 3 4, and a fixed pulley 4 rotatably mounted on a pulley mounting base 2 16 2 and a tension member 2 36 having one end attached to the pulley mount 2 16 and the other end attached to the slider 2 18 and routed via the moving pulley 41 and the constant pulley 42. In this example, the sensor rod 2 3 4 extends in the vertical direction which is vertically movably held by slide bearings 2 2 3 and 2 2 4 mounted on the bar mount 2 15 and the pulley mount 2 16. A rectangular plate 234a is horizontally welded to the lower end of the flat bar, which protrudes downward from the lower surface of the pulley mounting base 216. The number of the moving pulleys 41 in this example is two, and they are attached to the sensor rods 23 and 34 on both sides substantially parallel to each other at a substantially center (FIG. 24). The number of the fixed pulleys 42 is two in this example, and they are respectively mounted on the pulley mounting base 2 16 so as to be located on both sides of the sensor rod 2 34. The tendon 2 3 6 is two wires in this example, and when the upper part of the sensor rod 2 3 4 is pushed into the vertical hole 2 17 d, the slider 2 18 changes the elasticity of the first elastic body 2 2 1 It is arranged to descend against the force. The tendon 236 is loosely inserted into the pipe 237 which extends and is fixed in the base body 214 in the vertical direction (FIGS. 23, 26 and 27).

In addition, a mouth receiving member 238 to which the lower end of the sensor rod 234 can contact can protrude below the base 212 and is attached to the base 212 so as to be vertically movable. In this example, the mouth receiving member 2 3 8 is formed by bending a steel plate, and is mounted between the two reinforcing members 2 1 3 a and 2 1 3 a so as to cover the lower surface of the pulley mounting base 2 16. Can be At each of the four corners of the rod receiving member 2 3 8, four bosses 2 3 8 a extending in the vertical direction are fixed, respectively, and these bosses 2 3 8 a are two reinforcing members 2 1 3 a, 2 1 3 It is loosely fitted to four shafts 2 13 c which are attached to the concave portions 2 13 b and 2 13 b opposed to each other in the vertical direction. A compression coil spring 239 that urges the boss 238a in a downward direction is loosely fitted to the shaft 213c. When the base 2 1 2 is lowered onto the heavy load 2 1 1, the sensor rod 2 3 4 is applied to the elasticity of the first elastic body 2 2 1 via the rod receiving member 2 3 8 when the base 2 1 2 is lowered onto the heavy load 2 1 1. It has a mass that can be overcome and pushed into the vertical hole 2 17 d to lower the slider 2 18. The upper portion of the shaft 2 13 c is formed to have a large diameter by a predetermined length, and the upper surface of the boss 2 38 a loosely fitted to the shaft 2 13 c is formed by the large diameter portion 2 1 3 of the shaft 2 13 c. d By contacting the step at the lower end, the rod receiving portion 238 and the base 2 12 can be prevented from approaching a predetermined distance or more.

The locking means 243 has a long hole 246a which is loosely fitted to the sensor rod 234. In addition, a free bar 246 formed in a flat bar shape extending in the width direction of the sensor rod 234 in a loosely fitted state is provided. The elongated hole 2464a is formed substantially at the center of the universal bar 2446 and extends in the longitudinal direction of the bar 2464, and its length is formed slightly longer than the width of the sensor rod 2334. The base end of the universal bar 2 46 is provided with a mounting hole 2 46 b formed in a long hole extending in the longitudinal direction of the bar 2 46 and opened substantially in the horizontal direction. By passing the pin 2 52 through the upper end of the bracket 2 5 1 erected on the bar mounting base 2 1 5 and the mounting hole 2 4 6 b, it can be rotated in the vertical plane and slides in the longitudinal direction. It is movably attached to the bar mounting base 2 15 (Fig. 23, Fig. 26 and Fig. 27). When the swivel bar 246 reaches a predetermined angle, the sensor rod 234 is configured to be locked in the elongated hole 246a. In other words, the swivel bar 2 46 rotates around the bin 25 2 and moves in the longitudinal direction, and the sensor rods 2 3 4 are attached to both ends of the elongated hole 2 4 6 a of the swivel bar 2 4 6 a. The sensor rods 2 3 4 are temporarily pushed into the vertical holes 2 17 d by locking the both edges in the width direction. It is fixed.

The lock release means 255 includes two substantially L-shaped arms 2557 and 2557 for rotating the flexible bar 2464 in a direction to release the sensor rod 2334 from the flexible bar 2464. These arms 257 and 257 are pivotally opposed to each other on the bar mount 215, and rotate in a vertical plane perpendicular to the rotating vertical plane of the swivel bar 246. It has become. Arms 257 and 257 have vertical portions 257a and 257a and horizontal portions 257b and 257b, respectively. Vertical portions 257a and 257a are bases. The horizontal portions 2557b and 2557b extend below the tip of the free bar 2446, respectively, extending upward along the outer surfaces on both sides of the main body 214 (FIG. 24). Operation lobes 26 1 and 26 1 are attached to the upper ends of the vertical sections 25 7 a and 25 7 a, respectively, and tension coil springs are provided between the upper ends of the vertical sections 2 57 a and 2 57 a. 2 5 8 is passed over. The spring 258 is passed through a pipe 259 which extends and is fixed in the base body 211 in the horizontal direction, and brings the vertical portions 257a, 257a closer to each other, that is, the horizontal portion. Separate 2 57 b and 2 57 b from free bar 2 46 and urge them in the direction of pressing onto bar mounting base 2 15 _c On the upper surface of the base frame 2 13, near the opposite ends of the two reinforcing members 2 13 a, 2 13 a, four inverted U-shaped shirt holders 2 26 are fixed. The base ends of the four upper wires 222 are respectively attached to the holders 222 through shackles 27, and the tips of the upper wires 222 are hooks 31 of the crane 31. Locked to a. In addition, four U-shaped shackle holders 229 are fixed to the four corners on the lower surface of the base frame 2 13, respectively. U-shaped wire guides 2 27 are respectively fixed. The base ends of the four lower wires 2 32 are respectively attached to the shackle holders 2 9 via the shirt cle 27, and the ring 2 3 2a formed at the tip of the lower wire 2 32 is a heavy load 2 11 After passing through the wire engaging part 2 1 1a and the wire guide 2 2 7, it is inserted into the mast 2 17 (Fig. 23, Fig. 26 and Fig. 27) o

A method of using the heavy lifting material removing device thus configured will be described. As shown in Fig. 23 and Fig. 24, when the base 2 12 is lowered onto the heavy load 2 1 1 to engage the lower wire 2 3 1 with the heavy load 2 1 1 The receiving member 238 contacts the upper surface of the heavy object 211, and the base 212 further descends and stops when approaching the rod receiving member 238 to a predetermined distance. At this time, the sensor rod 2 3 4 whose lower end is in contact with the upper surface of the rod receiving member 2 3 8 is pushed up relatively to the mast 2 17 and the upper part of the sensor rod 2 3 4 7 is pushed into the vertical hole 2 17 d, that is, since the moving pulley 41 moves upward with respect to the mast 2 17 together with the sensor rod 23 4, the other end of the tendon 2 36 Pull slider 2 18 down. As a result, the slider 218 descends against the elastic force of the first elastic body 221. In this state, the ring 2 3 2 a at the tip of the lower wire 2 3 2 is passed through the wire engaging portion 2 1 1 a of the heavy load 2 1 1 and the wire guide 2 2 7, and then the mast 2 17 Insert (Fig. 25).

Then, as shown in FIGS. 25 and 26, the heavy object 2 11 is lifted by the crane 31 via the upper wire 2 28, the base 2 12 and the lower wire 2 32, and the base 2 1 2 Rises with the rod receiving member 2 38 in contact with the upper surface of the heavy load 2 11. Reinforcement member 2 1 3a recess 2 1 3 b by raising base 2 1 2 When the boss 2 3 8a of the rod receiving member 2 38 reaches the lower end of the shaft 2 13 c, the rod receiving member 2 3 8 moves from the heavy load 2 1 1 Ascend with base 2 1 2 away. At this time, since the sensor rod 2 34 is locked in the long hole 2 46 a of the free bar 2 46, the sensor rod 2 3 4 is kept pressed into the vertical hole 2 17 d of the mast 2 17. As a result, the rod receiving member 238 is separated from the lower end of the sensor rod 234.

Next, when the heavy object 2 11 is lowered to a predetermined place, the lower wire 2 32 is loosened. At this time, the base 2 12 is maintained in a state of being lifted by the crane 31 so that the rod receiving member 2 38 does not come into contact with the heavy load 2 11. In this state, pull one of the operation lobes 26 1 and 26 1 in the direction of the solid arrow in Fig. 24, and the horizontal part 2 57 7 b of the arm 2 57 Since the lower surface is pushed up, the sensor rod 234 is released from the universal bar 246. The sensor rod 234 descends due to its own weight and the elastic force of the first elastic body and contacts the rod receiving member 238, and at the same time, the slider 218 which is in a no-load state due to the landing of the heavy load 211. Rises due to the elastic force of the first elastic body 221 (FIG. 27), so that the ring 232 a of the lower wire 232 falls off the mast 217. Further, when the crane wire (not shown) is taken up and the base 2 12 is lifted, the lower wire 2 32 becomes the wire guide 2 2 7 and the wire engaging portion 2 1 1 of the heavy load 2 1 1. Exits from a and is pulled up with base 2 1 2.

In the first embodiment described above, an example is shown in which the lifting material removing device of the present invention is applied to civil engineering and construction work.However, the device of the present invention is not limited to this, and the work is performed at a place where heavy objects are installed. It can also be applied when there is a safety or hygiene problem for people to go.

Further, in the first and fourth embodiments, examples of wires are shown as the upper lifting members 28, 228, the lower lifting members 32, 232, and the tension members 36, 236. Cables, lobes, chains, etc. may be used instead of wires.

In the first embodiment, the base 12 is formed by joining a pair of steel plates 13 and 13 by welding via a pair of side plates 14 and 14 and the lower block 16. However, the base may be integrally formed from steel and steel, In the first and fourth embodiments, concrete blocks are used as heavy objects, and inverted U-shaped hooks are used as lifting member engaging portions. However, heavy objects may be cylindrical bodies such as telephone poles. It may be one having a plurality of protrusions such as a tetrapod. In these heavy objects, the entire peripheral surface of these heavy objects serves as a lifting member engaging portion, and the lower lifting member is wound around these peripheral surfaces.

In the first and fourth embodiments, a moving pulley is attached to the sensor rod, a constant pulley is attached to the base, and a tension member having one end attached to the base is routed via the moving pulley and the constant pulley. Although the end is attached to the slider, if one end of the tendon is attached to the sensor rod, the other end is attached to the slider, and the tendon is routed via a fixed pulley, the moving pulley becomes unnecessary.

In the first and fourth embodiments, the bases 1 and 2 11 are engaged with the lower rails 32 and 23 2 as shown in FIGS. 2, 2 1 2 was dropped on heavy load 1 1, 2 1 1 1. If the load is not flat, such as a tetrapod or telephone pole, the base 1 2, 2 1 2 should be placed on the heavy load. The sliders 18 and 118 are lowered and locked on the ground near the ground, and the bases 12 and 21 are lifted up again by a crane and moved above the heavy objects in this state. The lower wires 3 2, 2 32 are engaged with the object, and the ends of the wires 3 2, 2 32 can be fitted into the masts 17, 1 17.

In the first and second embodiments, the locked member is formed in a flat bar shape. However, if the locked member can be locked in the long hole of the flexible bar, the locked member is formed of a round bar, a round pipe, or a member of another shape. You may.

Although the through hole is formed in the locked member of the sensor rod in the third embodiment, it may be formed in the leg portion or the connection portion of the sensor rod.

Further, the shapes and structures of the masts 17, 1 17, sliders 18, 1 18, elastic bodies 21, 22, 22, etc. in the first to fourth embodiments are merely examples. It is not limited to the above example as long as they have equivalent functions.

As described above, according to the present invention, the base is lifted to the hook of the crane via the upper lifting member, and the lower lifting member whose base end is attached to the base is engaged with the lifting member engaging portion of the heavy object. , A mast installed on the base In the state where the slider is lowered by the slider lowering means by overcoming the elastic force of the first elastic body, the ring at the tip of the lower lifting material is fitted into the mast, and the licking means lowers the slider. In this state, the slider lowering means is temporarily fixed, and the unlocking means is configured to release the locking means.When the heavy object is lowered to a predetermined place, the locking means is unlocked by the unlocking means. Then, the slider is lifted by the elastic force of the first elastic body, and the ring of the lower lifting member comes off the mast. As a result, if the base is raised by a crane, the lower lifting material can be automatically removed from the heavy object, which not only saves a great deal of labor but also improves safety and hygiene. A heavy object can be easily installed using a crane even in a place where it cannot be placed.

A sensor rod having a slider lowering means movably inserted into the base and having a lower end protruding downward from the lower surface of the base; a movable pulley rotatably mounted on the sensor rod; and a rotatable mount rotatably mounted on the base. A fixed pulley, and a tension routed through the moving pulley and the fixed pulley so that the slider is lowered when one end is attached to the base and the other end is attached to the slider and the sensor rod is pushed into the base. If it is configured to have a tension member, the tension member is hardly exposed and is relatively short compared to the conventional detachment device using ゥ, in which the tension member is relatively long and exposed. I will not do it.

Also, in the case of a heavy object such as a tetrapot having a non-planar upper surface, the present invention provides a weight reduction in comparison with a conventional detaching device using a gate which does not rest on a heavy object in a stable state. Any shape of object can be lifted and lowered into place.

Furthermore, when a heavy object is lowered to a predetermined place, the tendon released from the releaser must be re-engaged with the releaser in order to lift another heavy object, compared to a conventional release device using a releaser. Thus, the present invention makes such work unnecessary.

In particular, if remote control means are used, heavy objects can be easily lowered to a remote place. Industrial applicability

The device for removing heavy lifting materials according to the present invention can easily remove lifting materials such as wires, cables, ropes, chains, etc. from heavy materials, which have been used for lifting construction materials in civil engineering and construction works. The lifting material can be used repeatedly.

Claims

The scope of the claims

1. A device for removing a lower lifting member (32, 232) engaged with a heavy object (11.211) having a lifting member engaging portion (11a, 211a) from the heavy object α1, 211),

Base (12,212),

An upper lifting member (28, 228) having a base end attached to the base (12, 212) and a tip formed to be hookable to a hook (31a) of the crane (31);

A mast (17, 217) erected on the base (12, 212);

A ring (32a, 232a) having a base end attached to the base (12, 212) and a tip end capable of being fitted into the mast (17, 217) is formed, and a lifting material engaging portion of the heavy object (11, 211) is formed. (1 la, 211a), the lower lifting material (32, 232),

The slider (18, 218) provided vertically movable on the mast (17, 217) and the slider (18, 218) in a no-load state have their upper ends at least coincide with the upper end of the mast (17, 217). First elastic body (21, 221)

Slider lowering means (33,233) for lowering the slider (18, 218) by overcoming the elastic force of the first elastic body (21, 221);

Locking means (43, 83, 103, 243) for temporarily fixing the slider lowering means (33, 233) with the slider (18, 218) lowered;

Unlocking means (55, 85, 105, 255) for releasing the locking means (43, 83, 103, 243);

A lifting device for a heavy lifting material, comprising:

2. A mast (17, 217) is formed in a cylindrical shape, a slider (18, 218) is slidably fitted into the mast (17, 217), and a first elastic body (21, 221) is attached to the mast (21, 221). The lifting of the lifting material according to claim 1, wherein the lifting coil is a compression coil spring that is loosely fitted to the lifting member.

3. Slider lowering means (33, 233)

A sensor rod (34, 104, 234) which is vertically movably inserted into the base (12, 212) and whose lower end projects downward from the lower surface of the base (12, 212);

A fixed pulley (42) rotatably mounted on said base (12, 212); One end is attached to the sensor rod (34, 104, 234), the other end is attached to the slider (18, 218), and the sensor port (34, 104, 234) is inside the base (12, 212). The tension members (36, 236) routed through the constant pulley (42) so as to lower the sliders (18, 218) when pushed into the

The heavy lifting material removing device according to claim 1, further comprising:

4. Slider lowering means (33, 233)

A sensor rod (34, 104, 234) inserted vertically movably into the base (12, 212) and having a lower end protruding downward from a lower surface of the base (12, 212);

A moving pulley (41) rotatably mounted on the sensor rod (34, 104, 234); a constant pulley (42) rotatably mounted on the base (12, 212);

When one end is attached to the base (12, 212), the other end is attached to the slider (18, 218) and the sensor rod (34, 104, 234) is pushed into the base (12, 212). Tension members (36, 236) routed through the moving pulley (41) and the constant pulley (42) so as to lower the sliders (18, 218);

5. Locking means (43, 83)

A sensor rod (34) inserted vertically movably into the base (12) and having a lower end protruding downward from the lower surface of the base (12) and protruding upward from the upper surface of the base α2). Covered members (44, 84),

The base (12) has elongated holes (46a, 86a) loosely fitted in the locked members (44, 84) and is rotatable in a vertical plane and slidable in the longitudinal direction in the loosely fitted state. Swivel bar (46,86) attached to

With

When the free bar (46, 86) is at a predetermined angle, the locked member (44, 84) is configured to be locked in the elongated hole (46a, 86a),

An arm (57, 87) for rotating the free bar (46, 86) in a direction in which the unlocking means (55, 85) releases the locked member (44, 84) from the free bar (46, 86). With

The heavy lifting material removing device according to claim 1.

6. The unlocking means (55)

A second elastic body (22) for urging the arm (57) in a direction to release the locked member (44) from the universal bar (46);

During operation, the arm (57) is held against the elastic force of the second elastic body (22), and the locked member (44) is locked to the free bar (46). Five

7) to release the locked member (44) from the free bar (46) by releasing the arm holder (58).

6. The heavy lifting material removing device according to claim 5, comprising:

7. The arm holder (58) is configured to be remotely controlled by remote control means (71),

The remote control means (71) is provided separately from the base (12), and is provided on the base (12) and a transmitting device (72) for wirelessly transmitting a control signal for controlling the arm holder (58). The control signal from the transmitter (? 2) is received and the arm holder (5

8) a receiving device (73) for controlling the

7. The heavy lifting material removal device according to claim 6.

8. The locking means (103)

A through-hole (114a) formed in a sensor rod α04) inserted vertically movably into the base (12) and having a lower end protruding downward from the lower surface of the base (12);

A lock bin (106) attached to the base (12) and insertable into the through hole (114a);

A third elastic body (108) for urging the lock bin (106) in a direction to enter the through hole (114a);

With

The mouth release means (105) includes an operation lever (111) for pulling out the mouth bin (106) from the through hole (114a) against the elastic force of the third elastic body (108). Was

The heavy lifting material removing device according to claim 1.

9. The rod receiving member (238), to which the lower end of the sensor rod (234) can abut, protrudes below the base (212) and is attached to the base (212) so as to be vertically movable. Heavy lifting material removal equipment.

10. The lip means (243) is vertically movably inserted into the base (212), and the lower end is loosely fitted to the sensor rod (234) projecting downward from the lower surface of the base (212). A free bar (246) having a hole (246a) and attached to the base (212) so as to be rotatable in the vertical plane and slidable in the longitudinal direction in the loosely fitted state;

When the free bar (246) is at a predetermined angle, the sensor rod (234) is configured to be locked in the long hole (246a),

An unlocking means (255) is provided with an arm (257) for rotating the swivel bar (246) in a direction to release the sensor rod (234) from the swivel bar (246).

The heavy lifting material removing device according to claim 1.