JP4241965B2 - Portable crane - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable crane which is attached to a gondola (bucket) of an aerial work vehicle, a veranda handrail of a high-rise apartment, or an apartment, and is used to roll up or retract an object on the ground.
[0002]
[Prior art]
In recent years, in the construction work such as the construction of telephones, advertisements on wall surfaces, replacement of street lights, etc. An aerial work vehicle equipped with a gondola having a wide range is widely used.
The worker performs various forms of work in the gondola, but different tools are required for each work. Therefore, the worker requests a different tool for each work from the worker waiting downward, and pulls it into the gondola from the ground to perform a desired work. Moreover, since the weight of the tool used for the above-mentioned work is generally 10 to 30 kg, the worker in the gondola can lift it directly by hand using a hanging wire, or lift it using a double pulley, The tool is pulled into the gondola.
[0003]
[Problems to be solved by the invention]
However, the above-described work of retracting the tool into the gondola using the aerial work vehicle still has the following problems to be solved.
That is, if the weight of the tool is about 10 kg, there is no problem even if one operator pulls it up by hand, but if the weight of the tool becomes 20-30 kg, the one worker cannot pull in the tool, and by any means Two people work. In this case, since the space in the gondola is narrow, the pull-in operation becomes difficult. In addition, placing two workers on the gondola has a small space in the gondola, so there is a risk that the worker may drop or the aerial work vehicle may fall.
Moreover, in the operation | work etc. which attach an advertisement etc. to a wall surface, while one operator rolls up an advertisement, it is necessary for the other worker to support an advertisement in an unreasonable posture.
[0004]
The present invention has been made in view of such circumstances, and even one worker can easily and safely wind up or pull up an object placed on the ground, and can be attached. An object of the present invention is to provide a portable crane that can be easily removed.
[0005]
[Means for Solving the Problems]
And the portable crane which concerns on this invention for solving the said subject is the fixed formed by the vertical wall which integrally connected the base part of the horizontal collar part which a front part extends horizontally toward an outer side at the upper end. A portable crane attached to an object,
A mount detachably attached to the fixed object, and a horizontal swivel base mounted pivotally on the upper surface of the mount, the base is the horizontal swivel slide raised or lowered freely earlier portion pivotally supported by the co and raisably arm fitted with a wire support pulley, said while being mounted on a horizontal swivel base, the wire support pulley winding the suspension wire hung via a winch capable rewinding, the raisably arm comprising the electromotive tilt angle adjusting tube for adjusting the force folding angle of the,
The raising / lowering angle adjusting pipe includes a large-diameter adjusting pipe provided with a first pin insertion hole, and a plurality of second adjustment holes fitted into the large-diameter adjusting pipe and aligned with the first pin insertion hole at a predetermined pitch. A small-diameter adjusting pipe provided with a pin insertion hole, and a lock that is constantly urged in the advancing direction by a spring provided in the casing at a position corresponding to the first pin insertion hole of the large-diameter adjusting pipe A lock pin advance / retract mechanism is attached to support the pin so that it can freely advance and retract.
The mounting base includes 1) a pair of inverted U-shaped mounting frames in side view formed by laying a horizontal frame member between upper ends of the inner and outer vertical frame members, and 2) the portal shape. An upper connecting frame for connecting the upper parts of the mounting frame; and 3) a laterally long frame having both side portions coupled to the outer vertical frame member of the gate-shaped mounting frame by a coupling bolt, and a cylindrical screw attached to the center of the laterally long frame A clamping means having a wall surface pressing portion attached to the tip of the forward and backward screw shaft, and a forward and backward screw shaft screwed to the cylindrical screw portion,
The wall surface pressing portion, the outer surface of the vertical wall, and the horizontal flange portion are pressed by pressing the wall surface pressing portion of the clamping means against the outer surface of the connecting portion between the vertical wall and the horizontal flange portion of the fixed object. The vertical wall is configured to be clampable between the lower surface of each of the two.
[0006]
In the above configuration, the fixed object refers to an object having sufficient rigidity for mounting a portable crane. For example, in the case of an aerial work vehicle, it means a gondola, and in the case of a high-rise apartment or apartment, a veranda handrail. Means.
The horizontal swivel can be swung using a manual swivel device or automatically swiveled using a power swivel device.
The winch may be either a manual winch or a power winch such as an electric winch, and has a built-in brake mechanism to prevent the object from accidentally falling suddenly when the object is lifted.
The raising / lowering arm can be formed from a beam made of a single rigid body, or can be configured to be telescopic.
[0007]
The raising / lowering angle adjusting tube includes a large-diameter adjusting tube provided with a first pin insertion hole, and a plurality of second adjustment holes fitted into the large-diameter adjusting tube and aligned with the first pin insertion hole at a predetermined pitch. A lock pin having a small-diameter adjusting pipe provided with a pin insertion hole, which is constantly urged in a forward direction by a spring provided in the casing at a position corresponding to the first pin insertion hole of the large-diameter adjusting pipe A lock pin advancing / retracting mechanism for supporting the reciprocating movement is attached. By adjusting the length of the tilt angle adjusting tube, the tilt angle can be easily adjusted.
In such a portable crane, an object on the ground is attached to the tip of a suspension wire suspended from the tip of a raising and lowering arm, and then the winch is operated to attach the object to, for example, a fixed object. After moving to the position of the gondola, which is an example, the object can be easily, reliably, and safely pulled into the gondola by turning the raising / lowering arm.
Here, a lock means that can fix the horizontal swivel to an arbitrary swivel angle can be attached to the mount. By using such a locking means, for example, when the fixed object is a gondola of an aerial work vehicle, the horizontal swivel naturally turns even if the gondola tilts and the horizontal swivel tilts. This can be reliably prevented, and the safety of work at high places can be improved.
[0008]
When the fixed object is formed by, for example, a vertical wall of a gondola of an aerial work vehicle in which a base part of a horizontal hook part that extends horizontally toward the outer side at the upper end is integrally connected, for example, A pair of inverted U-shaped gate-shaped mounting frames in a side view formed by installing a horizontal frame member between the upper ends of the outer vertical frame members, and an upper connecting frame for connecting the upper portions of the portal-shaped mounting frames to each other. The mounting base is provided with clamping means having both side portions attached to the outer vertical frame member of the gate-shaped attachment frame and having a wall surface pressing portion that is movable forward and backward at the front portion . That is, the wall surface pressing portion of the clamping means is pressed against the outer surface of the connecting portion between the vertical wall and the horizontal flange portion, and the vertical wall is formed between the wall surface pressing portion and the outer surface of the vertical wall and the lower surface of the horizontal flange portion. By clamping, the portable crane can be easily and reliably attached to a fixed object.
The main part of the mounting base, the horizontal swivel base, the raising / lowering arm, and the winch constituting the main part of the portable crane can be made of an aluminum alloy. In this case, the weight of the portable crane can be significantly reduced while securing sufficient strength, and the portable crane can be easily and quickly attached to a fixed object.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
[0010]
First, with reference to FIGS. 1-3, the whole structure of the portable crane A which concerns on one embodiment of this invention is demonstrated. In the present embodiment, the portable crane A is attached to the gondola 17 of the aerial work vehicle 10 which is an example of a fixed object.
As shown in FIG. 1, an aerial work vehicle 10 includes a truck 14 fixed to the ground 11 via outriggers 12 and 13, and a gondola raising / lowering base that is connected to a loading platform 15 of the truck 14 in a freely tiltable manner. The arm 16 and the gondola 17 attached to the front part of the gondola raising / lowering arm 16 are provided.
As shown in FIGS. 1 to 3, the portable crane A has a horizontal swivel 19 attached to the upper surface of a mount 18 detachably attached to the gondola 17 and a wire support pulley 20 at the tip. The base of the mounted raising / lowering arm 21 is pivotally supported by the horizontal swivel base 19 so as to be tilted up and down, and the suspension wire 23 suspended by the winch 22 provided on the horizontal swivel base 19 via the wire support pulley 20 is wound up. The raising / lowering angle of the raising / lowering arm 21 is adjusted by the raising / lowering angle adjusting tube 24 which is an example of the rewinding / tilting angle adjusting means.
[0011]
Next, the configuration of each part of the portable crane A having the above-described configuration will be described with reference to FIGS.
First, the structure of the mounting base 18 is demonstrated with reference to FIGS.
As shown in FIGS. 2 and 3, the mounting base 18 is a pair of inverted U-shaped in a side view formed by laying a horizontal frame member 27 between the upper ends of the inner and outer vertical frame members 25 and 26, respectively. The gate-shaped mounting frame 28, the upper connecting frame 28a for connecting the upper parts of the two portal-shaped mounting frames 28, and both sides are mounted on the outer vertical frame member 26 of the both-portal mounting frame 28, and can be moved forward and backward. A gondola clamp mechanism 30 which is an example of a clamp means having a wall pressing portion 29 is provided.
[0012]
As shown in FIGS. 3, 6 and 7, the gondola clamp mechanism 30 includes a laterally long frame 30a whose both side portions are coupled to the outer vertical frame member 26 of the double portal mounting frame 28 by coupling bolts 28b, and a laterally long frame 30a. A cylindrical screw portion 30b attached to the center of the cylindrical screw portion, an advance / retreat screw shaft 30c screwed into the cylindrical screw portion 30b, the wall surface pressing portion 29 attached to the tip of the advance / retreat screw shaft 30c, and an advance / retreat screw shaft. It is comprised from the handle 30d attached to the rear end of 30c. Further, the wall surface pressing portion 29 has a sufficient width W in the width direction.
[0013]
With this configuration, as shown in FIGS. 2 and 3, the mounting base 18 is attached to the upper portion of the vertical wall 31 of the gondola 17, and the wall pressing portion 29 of the advance / retreat screw shaft 30 c is extended to extend the gondola 17. The vertical wall 31 is clamped between the wall surface pressing portion 29 and the outer surface of the vertical wall 31 and the lower surface of the horizontal flange portion 32 by pressing the outer surface of the connecting portion of the vertical wall 31 and the horizontal flange portion 32. Can do. Further, even when an upward force is applied to the gondola 17, it is possible to reliably prevent the mounting base 18 from coming out of the gondola 17. As shown in FIGS. 2 and 3, the base portion of the horizontal flange 32 is integrally connected to the upper portion of the vertical wall 31 of the gondola 17, and the tip portion thereof extends horizontally toward the outside. Yes.
[0014]
Next, the configuration of the horizontal swivel 19 will be described with reference to FIGS.
As shown in the figure, a swivel 33 of the horizontal swivel 19 is mounted on the upper connection frame 28a of the mount 18 so as to be rotatable by 360 °. Specifically, a through hole is coaxially provided in each of the upper connecting frame 28a of the mounting base 18 and the central part of the swivel 33 of the horizontal swivel base 19, and the rotary shaft 34 is inserted through both through holes. Upper and lower flanges 35 and 36 are attached to both ends of the rotating shaft 34, respectively. In this way, by holding the horizontal frame member 27 of the mounting base 18 and the swivel 33 of the horizontal swivel base 19 between the upper and lower flanges 35 and 36 via the rotating shaft 34, the horizontal swivel base 19 is attached to the mounting base 18. Can be pivotally mounted.
As shown in FIGS. 2 to 4, a pair of vertically long brackets 37 are erected on the upper surface of the swivel board 33 with a parallel interval at which the base portion of the raising and lowering arm 21 can be inserted by the center distribution. Yes.
[0015]
Next, the configuration of the raising / lowering arm 21 will be described with reference to FIGS.
As shown in the figure, the base portion of the raising / lowering arm 21 made of a long rigid beam is pivotally connected to one side portion of the bracket 37 of the mounting base 18 by a pivot 38. On the other hand, a wire support pulley 20 is rotatably attached to the tip of the raising / lowering arm 21 by a pivot 39. An intermediate wire support pulley 40 is rotatably attached to the intermediate position of the raising / lowering arm 21 by a pivot 41.
[0016]
Next, the configuration of the winch 22 will be described with reference to FIGS.
As shown in the drawing, the winch 22 is attached to the upper portion of the bracket 37 of the mounting base 18, and the suspended wire 23 unwound from the winch 22 is wound around the intermediate wire support pulley 40 and the wire support pulley 20. After that, it hangs downward, and a hook 42 for locking an object is connected to the lower end thereof.
[0017]
A winch drum 43 around which the suspension wire 23 is wound in multiple layers is fixed to a rotating shaft 44 that is rotatably supported by a bracket 37. A base of a rotary lever 45 is fixed to one end of the rotary shaft 44, and a handle 46 is attached to the tip of the rotary lever 45. The base of the handle 46 is attached to the tip of the rotary lever 45 by a pivot 47 wound with a return spring, and a stopper 48 that is bent in a direction perpendicular to the axis of the handle 46 is connected to the base of the handle 46. Has been. Therefore, in use, as shown in FIG. 4, the handle 46 can be operated at a position perpendicular to the rotary lever 45 to wind or unwind the hanging wire 23, and the hand can be accidentally moved. Even when the handle 46 is separated from the handle 46, the handle 46 and the stopper 48 automatically return from the solid line position to the position indicated by the phantom line, and the stopper 48 is locked to the bracket 37, so that the rotation lever 45 is further rotated. Therefore, the winding and feeding of the hanging wire 23 can be stopped, and the safety of work can be improved. The winch 22 can be driven by power by connecting an electric motor or the like to the rotating shaft 44 instead of the rotating lever 45.
[0018]
Next, the configuration of the raising / lowering angle adjusting tube 24 will be described with reference to FIGS. 2 to 5 and 8.
As shown in the figure, the other end of the large-diameter adjusting tube 50 having one end pivotally connected to the top of the bracket 37 by a pivot 49, and one end having a small diameter pivotally connected to the middle part of the raising / lowering arm 21 by a pivot 51. The other end of the adjusting tube 52 is slidably fitted.
Further, as shown in FIGS. 8A and 8B, the large-diameter adjusting pipe 50 is provided with one first pin insertion hole 53, and the small-diameter adjusting pipe 52 has a large-diameter adjusting pipe 52 with a large diameter. A plurality of second pin insertion holes 54 aligned with the first pin insertion holes 53 at a predetermined pitch are provided in conjunction with relative sliding with respect to the diameter adjusting tube 50. Further, in the large diameter adjusting tube 50, a lock pin 55 that is constantly urged in the advancing direction by a leaf spring 55b provided in the casing 55a is supported at a position corresponding to the first pin insertion hole 53 so as to freely advance and retract. A lock pin advance / retreat mechanism 56 is attached. In the present embodiment, the lock pin advance / retreat mechanism 56 is formed of a sliding plate having a convex protrusion upward at the center.
[0019]
With the configuration described above, the lock pin advancing / retracting mechanism 56 is actuated to extract the lock pin 55 from the second pin insertion hole 53, and then the small diameter adjustment tube 52 is slid relative to the large diameter adjustment tube 50 to obtain a predetermined value. In the sliding position, the lock pin advancing / retracting mechanism 56 is operated again to insert the lock pin 55 into the second pin insertion hole 54, thereby adjusting the distance between the pivots 49, 51 and It can be held at a predetermined tilt angle.
[0020]
Moreover, in this Embodiment, as shown in FIGS. 3-5, FIG.9 and FIG.10, the swivel base which is an example of the locking means which can fix the horizontal swivel base 19 to arbitrary swivel angles to the mounting base 18. FIG. A fixing device 57 is provided.
As shown in the drawing, a large number of mountain-shaped claw fitting grooves 58 are formed at a predetermined pitch in the circumferential direction on the outer peripheral surface of the swivel 33 that forms the horizontal swivel base 19. On the other hand, a cylindrical casing 59 is disposed on the horizontal frame member 27 of the mounting base 18 at the same level as the horizontal swivel base 19. An advancing / retracting shaft comprising a front large-diameter screw shaft portion 60 and a rear small-diameter shaft portion 60a is mounted in the cylindrical casing 59 so as to freely advance and retract. An engaging claw mounting plate 62 having a pair of engaging claws 61 on the front surface is connected to the front end of the front large-diameter screw shaft portion 60, and a gripping portion 63 is provided at the rear end of the rear small-diameter shaft portion 60a. It is connected continuously. The front large-diameter screw shaft portion 60 is loosely screwed into a female screw portion provided on the inner surface of the front portion of the cylindrical casing 59. Further, in the cylindrical casing 59, a torsion spring 64 that advances and retreats toward the claw fitting groove 58 provided on the outer peripheral surface of the horizontal swivel base 19 by using its restoring force is disposed. ing.
[0021]
With such a configuration, the engaging claw 61 is engaged with the claw fitting groove 58 unless the holding portion 63 is grasped and the engagement between the engaging claw 61 and the claw fitting groove 58 is released. 19 is fixed to the mounting base 18. Therefore, even when the gondola 17 is tilted and, as a result, the horizontal swivel 19 is tilted, it is possible to reliably prevent the horizontal swivel 19 from turning naturally, and to improve work safety. it can.
[0022]
In the present embodiment, the main part of the mounting base 18, the horizontal swivel base 19, the raising / lowering arm 21, and the winch 22 that constitute the main part of the portable crane A can be made of aluminum alloy. In this case, the weight of the portable crane A can be significantly reduced while securing sufficient strength.
[0023]
Next, the lifting operation of the object by the portable crane A having the above-described configuration will be described.
During normal times, the raising / lowering arm 21 is held at the standby position (a) shown in FIG.
By grasping the handle 46 of the winch 22 and rotating the rotary lever 45 in one direction, the suspension wire 23 is rewound from the winch drum 43 and the hook 42 attached to the tip of the suspension wire 23 is lowered to the ground 11. To do. An object on the ground 11 is locked to the hook 42. By grasping the handle 46 of the winch 22 and rotating the rotary lever 45 in the reverse direction, the suspension wire 23 is wound around the winch drum 43 and the object is lifted to a position slightly higher than the gondola 17. After grasping the gripping portion 63 of the swivel base fixing device 57 and releasing the engaging claw 61 from the claw fitting groove 58, the raising and lowering arm 21 is swung 180 degrees integrally with the horizontal swivel base 19 to remove the object from the gondola 17 The object is removed from the hook 42. Thereafter, the raising / lowering arm 21 is turned 180 ° integrally with the horizontal turntable 19 and moved to the standby position (a) to complete the lifting operation.
[0024]
On the other hand, in FIG. 3, the horizontal holding position (b) is a position where the raising / lowering arm 21 can be held substantially horizontally, and is used, for example, when holding an object in a suspended state.
As described above, by using the portable crane A according to the present embodiment, an object that is normally placed on the ground 11 and has a weight of 10 to 30 kg is easily and safely wound up or pulled up. And can be held in place in the air.
In addition, when the mounting base 18, the horizontal swivel base 19, the raising / lowering arm 21, and the winch 22 that are the main parts of the portable crane A are made of an aluminum alloy, the portable crane A is portable while ensuring sufficient strength. The weight of the crane A can be significantly reduced, and the portable crane A can be easily and quickly attached to the gondola 17 and can be removed.
[0025]
Furthermore, by using the portable crane A according to the present embodiment, the portable crane A can be attached to the gondola 17 in a stable state even when the raising and lowering arm 21 swings back and forth and left and right, as will be described below. it can.
That is, the overturning moment M generated when the raising and lowering arm 21 suspending the object having the weight Q is in the position extending forward as shown in FIG. 11 is supported by the parts c and d of the gondola 17. Since the distance L1 between the portions c and d is sufficiently secured, the force P1 applied to the portions c and d can be reduced, and the vertical wall 31 and the horizontal flange 32 of the gondola 17 receive a large force. It can be prevented from being damaged.
The overturning moment M generated when the raising and lowering arm 21 suspending the object having the weight Q is in a position extending rearward as shown in FIG. 12 is supported by the parts c and e of the gondola 17. Since the distance L2 between c and e is sufficiently secured in this case as well, the force P2 applied to the parts c and e can be reduced, and the vertical wall 31 and the horizontal flange 32 of the gondola 17 receive a large force. And can be prevented from being damaged.
[0026]
Although the overturning moment M generated when the raising and lowering arm 21 suspending the object having the weight Q is in the position extending to the right side shown in FIG. 13 is supported by the parts f and g of the gondola 17, Since the distance L3 between the parts f and g is sufficiently secured in this case as well, the force P3 applied to the parts f and g can be reduced, and the vertical wall 31 and the horizontal flange 32 of the gondola 17 exert a large force. It can be prevented from being damaged.
Although the overturning moment M generated when the raising and lowering arm 21 suspending the object having the weight Q is in the position extending to the left as shown in FIG. 14 is supported by the parts h and i of the gondola 17, Since the distance L4 between the parts h and i is sufficiently secured in this case as well, the force P4 applied to the parts h and i can be reduced, and the vertical wall 31 and the horizontal flange 32 of the gondola 17 exert a large force. It can be prevented from being damaged.
[0027]
As described above, the present invention has been described with reference to one embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. Other embodiments and modifications conceivable within the scope of the above are also included.
[0028]
【The invention's effect】
The portable crane according to any one of claims 1 to 3 , wherein a horizontal swivel is pivotally mounted on an upper surface of a mount that is detachably mounted on a fixed object, and a base portion of a raising / lowering arm having a wire support pulley attached to a tip thereof. The hanging wire is pivoted on the horizontal swivel so that it can be tilted up and down, and the suspension wire is wound up by the winch provided on the horizontal swivel via the wire support pulley. The tilt angle is adjusted. Therefore, by attaching an object on the ground to the tip of the hanging wire suspended from the tip of the raising and lowering arm, and then operating the winch, even one worker can use a gondola or condominium on an aerial work vehicle. It can be rolled up to the veranda of the apartment, and then the arm can be swung to pull the object easily, surely and safely into a gondola.
[0029]
3. The portable crane according to claim 2, wherein a lock means capable of fixing the horizontal swivel to an arbitrary swivel angle is attached to the mount, for example, the gondola of an aerial work vehicle tilts, resulting in a horizontal swivel. Even when the table is tilted, the horizontal swivel can be reliably prevented from turning naturally, and the safety of work at high places can be improved.
[0030]
In particular, in the portable crane according to claim 1 , the mounting base includes a pair of inverted U-shaped gate-shaped mounting frames, an upper connecting frame that connects the upper portions of both gate-shaped mounting frames, and a portal-shaped mounting frame. And clamping means attached to the outer vertical frame member, so that after the gate-shaped attachment frame is straddled on the vertical wall having the horizontal flange portion, the wall surface pressing portion of the clamping means is the vertical wall and the horizontal flange portion. The portable crane can be easily and reliably fixed to the fixed object by pressing against the outer surface of the connecting part of the wall and clamping the vertical wall between the wall surface pressing part and the outer surface of the vertical wall and the lower surface of the horizontal flange. Can be installed. Further, it is possible to prevent the vertical wall and the horizontal flange from being damaged by receiving a large force.
[0031]
In the portable crane according to claim 3 , sufficient strength can be obtained by making the main part of the mounting base, the horizontal swivel base, the raising and lowering arm, and the winch that constitute the main part of the portable crane from an aluminum alloy. The weight of the portable crane can be remarkably reduced while securing the load, and the portable crane can be easily and quickly attached to a fixed object.
[Brief description of the drawings]
FIG. 1 is a use state explanatory diagram showing a state in which a portable crane according to an embodiment of the present invention is installed on a truck.
FIG. 2 is a perspective view of a portable crane according to an embodiment of the present invention.
FIG. 3 is a side view of the same.
FIG. 4 is a front view of the same part cutout.
FIG. 5 is a plan view of the same.
FIG. 6 is a plan view of clamp means forming a part of a mount for a portable crane according to an embodiment of the present invention.
7 is a cross-sectional view taken along the line II of FIG.
FIG. 8 is a partially cutaway side view of the main part of the raising / lowering angle adjusting means of the portable crane according to the embodiment of the present invention.
FIG. 9 is a plan view showing the main part of the locking means of the portable crane according to one embodiment of the present invention.
FIG. 10 is a side view of the same.
FIG. 11 is an explanatory diagram showing a state of a force acting on the gondola when the raising and lowering arm is extended forward in the portable crane according to the embodiment of the present invention.
FIG. 12 is an explanatory diagram showing a state of a force acting on the gondola when the raising and lowering arm is extended rearward in the portable crane according to the embodiment of the present invention.
FIG. 13 is an explanatory diagram showing a state of a force acting on the gondola when the raising and lowering arm is extended rightward in the portable crane according to the embodiment of the present invention.
FIG. 14 is an explanatory diagram showing a state of a force acting on the gondola when the raising and lowering arm is extended to the left side in the portable crane according to the embodiment of the present invention.
[Explanation of symbols]
A Portable crane M Falling moment L1 distance L2 distance L3 distance L4 distance P1 force P2 force P3 force P4 force W width c part d part e part f part g part h part i part 10 aerial work platform 11 outrigger 13 outrigger 13 DESCRIPTION OF SYMBOLS 14 Truck 15 Loading platform 16 Gondola raising / lowering arm 17 Gondola 18 Mounting stand 19 Horizontal swivel stand 20 Wire support pulley 21 Lifting arm 22 Winch 23 Hanging wire 24 Tilting angle adjustment pipe 25 Inner vertical frame member 26 Outer vertical frame member 27 Horizontal Frame member 28 Portal mounting frame 28a Upper connection frame 28b Connection bolt 29 Wall pressing part 30 Gondola clamp mechanism 30a Horizontal long frame 30b Cylindrical screw part 30c Advance / retreat screw shaft 30d Handle 31 Vertical wall 32 Horizontal flange 33 Rotating disc 34 Rotating shaft 35 Upper flange 36 Lower flange 37 Racket 38 Pivot 39 Pivot 40 Intermediate wire support pulley 41 Pivot 42 Hook 43 Winch drum 44 Rotation shaft 45 Rotation lever 46 Handle 47 Pivot 48 Stopper 49 Pivot 50 Large diameter adjustment tube 51 Pivot 52 Small diameter adjustment tube 53 First pin insertion hole 54 Second pin insertion hole 55 Lock pin 55a Casing 55b Leaf spring 56 Lock pin advance / retreat mechanism 57 Pivot stand fixing device 58 Claw fitting groove 59 Cylindrical casing 60 Front large diameter screw shaft portion 60a Rear small diameter shaft portion 61 Engaging claw
62 engaging claw mounting plate 63 gripping part
64 Torsion spring

Claims (3)

It is a portable crane attached to a fixed object formed by a vertical wall integrally connected to the base of a horizontal saddle that extends horizontally toward the outer side at the top end,
A mounting base that is detachably attached to the fixed object, a horizontal swiveling base that is pivotably attached to the upper surface of the mounting base, and a base that is pivotably supported by the horizontal swiveling base and is supported by a wire at the front part. A raising / lowering arm to which a pulley is attached, a winch that is mounted on the horizontal swivel and that is capable of winding and unwinding a suspension wire suspended via the wire support pulley, and a raising / lowering of the raising / lowering arm. A tilt angle adjustment tube for adjusting the tilt angle;
The raising / lowering angle adjusting pipe includes a large-diameter adjusting pipe provided with a first pin insertion hole, and a plurality of second adjustment holes fitted into the large-diameter adjusting pipe and aligned with the first pin insertion hole at a predetermined pitch. A small-diameter adjusting pipe provided with a pin insertion hole, and a lock that is constantly urged in the advancing direction by a spring provided in the casing at a position corresponding to the first pin insertion hole of the large-diameter adjusting pipe A lock pin advance / retract mechanism is attached to support the pin so that it can freely advance and retract .
The mounting base includes 1) a pair of inverted U-shaped mounting frames in side view formed by laying a horizontal frame member between upper ends of the inner and outer vertical frame members, and 2) the portal shape. An upper connecting frame for connecting the upper parts of the mounting frame; and 3) a laterally long frame having both side portions coupled to the outer vertical frame member of the gate-shaped mounting frame by a coupling bolt, and a cylindrical screw attached to the center of the laterally long frame A clamping means having a wall surface pressing portion attached to the tip of the forward and backward screw shaft, and a forward and backward screw shaft screwed to the cylindrical screw portion,
The wall surface pressing portion, the outer surface of the vertical wall, and the horizontal flange portion are pressed by pressing the wall surface pressing portion of the clamping means against the outer surface of the connecting portion between the vertical wall and the horizontal flange portion of the fixed object. A portable crane configured such that the vertical wall can be clamped with the lower surface of the crane.   The portable crane according to claim 1, further comprising a lock unit attached to the mount and capable of fixing the horizontal swivel to an arbitrary swivel angle. The portable crane according to any one of claims 1 and 2 , wherein the mounting base, the horizontal swivel base, the raising / lowering arm, and a main part of the winch are made of an aluminum alloy.

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