Deep-frying device

Abstract

To prevent a contact member from slipping against a vertical bar member to ensure that a material carrier is prevented from falling, when attaching a fall prevention mechanism to an unloading device.SOLUTION: An unloading device comprises an adjustment box 10 that moves up and down along a first guide pipe 50 having a circular cross section, and a material carrier 40 connected to the adjustment box 10. The adjustment box 10 comprises a box frame with a top plate, a lifting body 20 that slides up and down on the circumference of the first guide pipe 50, and a fall prevention mechanism that prevents the material carrier 40 from falling. The fall prevention mechanism comprises: an engagement portion that engages a lifting member of a lifting device; a hooked plate having a locking portion pressed against the circumference of the first guide pipe 50 when the lifting member is released from lifting; a coil spring that tilts the hooked plate and presses the locking portion against the circumference of the first guide pipe 50; and a guide frame that is attached to the top plate to guide the tilting of the hooked plate.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a hoisting device for transporting materials used for assembling a scaffold to a high place.

Background Art

[0002] In construction work, various scaffolds are used. For the materials of the scaffolds, steel pipes and the like are used. When assembling the scaffold, various pipes and the like are combined in order from the bottom, and a scaffold of a predetermined height is assembled. And, in order to assemble a medium- or high-rise scaffold, it is necessary to transport materials such as pipes used to a high place. At this time, a hoisting (lifting) device that raises and lowers a load platform on which materials are placed along a vertical rod-shaped member such as a guide rail by a winch or the like may be used. In this hoisting device, various fall prevention mechanisms are attached in order to prevent the load platform on which materials are placed from falling due to, for example, the breakage of a lifting wire rope such as a winch. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-81205) discloses a temporary structure hoisting device including a single guide rail fixed to a temporary structure, a lifting member that can move up and down along this guide rail, a lifting means attached to the upper end of the guide rail to move the lifting member up and down, and a load placement member attached to the horizontal portion of the lifting member so as to be rotatable. A lock mechanism for fixing the load placement member to the lifting member is provided on the load placement member and the lifting member (Patent Document 1 [Claim 1]). In this temporary structure hoisting device, a fall prevention mechanism connected to the wire of the lifting means is provided at the upper end of the lifting member. This fall prevention mechanism pivotally fixes a hanging hanger to the upper end of the lifting member so as to be swingable in the vertical direction, a connecting portion with the lifting means at the tip of the hanging hanger, and an outer fitting portion to the guide rail that is loosely fitted to the guide rail in the horizontal state of the hanging hanger and bites into the guide rail when the hanging hanger tilts are provided at the rear end, and it is formed by biasing the elasticity in the tilting direction of the hanging hanger (Ibid. [Claim 5]).

[0003] In the anti-falling mechanism of this Citation 1, when the wire is cut in the lifted state of the loading device, the lifting force at the tip of the hanging hook disappears, and the hanging hook inclines due to the elasticity of the spring. Therefore, the outer fitting part at the rear end acts so as to bite into the guide rail, and the loading device stops (see the same paragraph

[0044] ). However, in the loading device of Citation 1, since the guide rail is a square steel pipe and the outer fitting part of the anti-falling mechanism is configured to bite in while making line contact or surface contact along the circumferential surface of the guide rail, there is a problem that the outer fitting part easily slides downward along the circumferential surface of the guide rail and the anti-falling function cannot be fully exerted. Further, in the anti-falling mechanism of Citation 1, a shaft (shaft 71) for pivotally fixing the hanging hook is provided. When the wire of the loading device is cut, the hanging hook swings (rotates) about the shaft (shaft 71) and inclines due to the elasticity of the spring. As a result, the outer fitting part is pressed against the circumferential surface of the guide rail. Therefore, there is also a problem that the outer fitting part cannot be strongly pressed against the circumferential surface of the guide rail, the outer fitting part easily slides downward along the circumferential surface of the guide rail, and the anti-falling function cannot be fully exerted.

[0004] Next, Patent Document 2 (Japanese Patent Application Laid-Open No. 2014-84202) describes a temporary structure unloading device (Patent Document 2 [Claim 1]) including a pair of guide rails provided in parallel to each other and fixed to the temporary structure, two lifting members movably fixed up and down to each of the guide rails, a wire having both ends connected to the respective lifting members, and a wire feeding device for moving each lifting member up and down such that when one lifting member is lifted by feeding an intermediate portion of the wire attached above the guide rail, the other lifting member is lowered. In this temporary structure unloading device, a fall prevention mechanism for connecting to the wire is provided at the upper end of the lifting member. The fall prevention mechanism includes a hanging hanger provided at the upper end of the lifting member, having a tip connected to the wire and capable of advancing and retreating in the vertical direction, and a stopper connected to the rear end of the hanging hanger and pivotally supported such that the tip portion can be separated from and contacted with the outer peripheral surface of the guide rail. When the hanging hanger is on the upper side, the tip portion is loosely fitted to the guide rail, and when the hanging hanger is on the lower side, the tip portion acts to bite into the guide rail (Ibid. [Claim 4]).

[0005] In the fall prevention mechanism of this Cited Document 2, a rotating shaft (rotating shaft 232) is provided on the main body (main body 231) of the stopper (stopper 23), and the main body is configured to be rotatable around the rotating shaft. The rotating shaft is attached to a stopper attachment portion provided on the support column of the lifting member. On the front side of the main body of the stopper, an engaging protrusion (engaging protrusion 234) is provided. When the tension of the wire, such as wire cutting, is released, the hanging hanger moves downward, and the engaging protrusion of the stopper contacts the guide rail to fix the lifting member to the guide rail and restrict the movement of the lifting member (see the same paragraph

[0034] to

[0036] ). However, in the unloading device of Cited Document 2, similar to the unloading device of Cited Document 1, the guide rail is a square steel pipe, and the engaging protrusion of the stopper contacts the corner of the guide rail to restrict the movement of the lifting member. Therefore, although the engaging protrusion is provided on the stopper, the stopper only contacts the corner of the guide rail, and the stopper easily slides along the corner of the guide rail and moves downward, resulting in a problem that the fall prevention function cannot be fully exerted. Further, in the fall prevention mechanism of Cited Document 2, a rotating shaft for rotating the main body of the stopper is provided. When the tension of the wire is released, such as when the wire is cut, the main body of the stopper rotates around the rotating shaft, and thereby the engaging protrusion of the stopper is pressed against the corner of the guide rail. Therefore, the engaging protrusion of the stopper cannot be strongly pressed against the corner of the guide rail, and the engaging protrusion of the stopper easily slides along the corner of the guide rail and moves downward, also resulting in a problem that the fall prevention function cannot be fully exerted.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] The problem to be solved by the present invention is that when attaching a fall prevention mechanism using a contact member that contacts a vertical rod-shaped member to a unloading device that raises and lowers a material carrier loaded with materials along a vertical rod-shaped member by means of a winch or the like, the contact member is made difficult to slide with respect to the vertical rod-shaped member, and the contact member can be strongly pressed against the vertical rod-shaped member, and also the contact member is prevented from sliding with respect to the vertical rod-shaped member, so as to reliably prevent the material carrier from falling.

[0008] The invention according to claim 1 is a cargo unloading device comprising an adjustment box that moves up and down along a vertical rod-shaped member with a circular cross-section, and a material carrier connected to the adjustment box. The adjustment box includes a box frame body having an upper panel, a lifting body that moves up and down on the circumferential surface of the vertical rod-shaped member, and a fall prevention mechanism for preventing the material carrier from falling. The fall prevention mechanism includes an engaging portion that engages with a lifting member of a lifting device for lifting the adjustment box, a locking member that is pressed against the circumferential surface of the vertical rod-shaped member so as to sandwich the circumferential surface when the lifting of the lifting member is released, a biasing member that biases the locking member to press it against the circumferential surface of the vertical rod-shaped member , and a guide frame attached to the upper panel for guiding the locking member to incline without rotating. When the lifting member is pulled up and the engaging portion is lifted, the locking member is lifted. When the locking member contacts the upper panel and the locking member and the box frame body rise, and when the lifting of the lifting member is released, the locking member inclines without rotating due to the biasing force of the biasing member, and the locking member is pressed against the circumferential surface of the vertical rod-shaped member . At the same time, the weight of the material carrier acts on the locking member so as to increase the pressing of the locking member against the circumferential surface of of the vertical rod-shaped member , thereby providing a cargo unloading device to solve the above problems. the vertical rod-shaped member The invention according to claim 2 is a cargo unloading device in which the locking member is a hook-shaped plate composed of a locking portion formed with a notch and a flat plate portion continuous with the locking portion. The hook-shaped plate is arranged in the box frame body such that the flat plate portion comes to a position surrounded by the guide frame. When the lifting of the lifting member is released, the hook-shaped plate inclines without rotating due to the biasing force of the biasing member, and the notch is pressed against the circumferential surface of the vertical rod-shaped member , thereby providing a cargo unloading device to solve the above problems. the vertical rod-shaped member The invention according to claim 2 is a cargo unloading device in which the locking member is a hook-shaped plate composed of a locking portion formed with a notch and a flat plate portion continuous with the locking portion. The hook-shaped plate is arranged in the box frame body such that the flat plate portion comes to a position surrounded by the guide frame. When the lifting of the lifting member is released, the hook-shaped plate inclines without rotating due to the biasing force of the biasing member, and the notch is pressed against the circumferential surface of the vertical rod-shaped member , thereby providing a cargo unloading device to solve the above problems. of the vertical rod-shaped member The invention according to claim 2 is a cargo unloading device in which the locking member is a hook-shaped plate composed of a locking portion formed with a notch and a flat plate portion continuous with the locking portion. The hook-shaped plate is arranged in the box frame body such that the flat plate portion comes to a position surrounded by the guide frame. When the lifting of the lifting member is released, the hook-shaped plate inclines without rotating due to the biasing force of the biasing member, and the notch is pressed against the circumferential surface of the vertical rod-shaped member , thereby providing a cargo unloading device to solve the above problems.

[0009] The invention according to claim 2 is a cargo unloading device in which the locking member is a hook-shaped plate composed of a locking portion formed with a notch and a flat plate portion continuous with the locking portion. The hook-shaped plate is arranged in the box frame body such that the flat plate portion comes to a position surrounded by the guide frame. When the lifting of the lifting member is released, the hook-shaped plate inclines without rotating due to the biasing force of the biasing member, and the notch is pressed against the circumferential surface of the vertical rod-shaped member , thereby providing a cargo unloading device to solve the above problems. the vertical rod-shaped member The invention according to claim 2 is a cargo unloading device in which the locking member is a hook-shaped plate composed of a locking portion formed with a notch and a flat plate portion continuous with the locking portion. The hook-shaped plate is arranged in the box frame body such that the flat plate portion comes to a position surrounded by the guide frame. When the lifting of the lifting member is released, the hook-shaped plate inclines without rotating due to the biasing force of the biasing member, and the notch is pressed against the circumferential surface of the vertical rod-shaped member , thereby providing a cargo unloading device to solve the above problems.

Advantages of the Invention

[0010] In the unloading device of the present invention, when the lifting of the lifting member is released, the locking member is pressed against the peripheral surface of the vertical rod-shaped member having a circular cross section. Therefore, the locking member is less likely to slip with respect to the vertical rod-shaped member. Further, since the locking member is inclined without rotating and pressed against the vertical rod-shaped member, the locking member can be strongly pressed against the vertical rod-shaped member, and the effect of reliably preventing the material carrier from falling can be achieved.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Embodiments for Carrying Out the Invention

[0012] [Overall Configuration of Unloading System and Unloading Device] FIG. 1 is a perspective view showing the configuration of the unloading device of the present invention and the entire unloading system including the unloading device. In the figure, 1 is the unloading system, 2 is the unloading device, 3 is the hook portion of the lifting device, 4 is the wire rope, 10 is the adjustment box, 20 and 20' are the elevating bodies, 30 is the clamp, 40 is the material carrier, 50 is the first guide pipe, 60 is the second guide pipe, and 70 is the support column. In each figure, X is the left - right direction, Y is the front - rear direction, and Z is the up - down direction. As shown in FIG. 1, the unloading system 1 is composed of an unloading device 2, a lifting device with a hook portion 3, a wire rope 4 for lifting the unloading device 2, a first guide pipe 50 for guiding the elevation of the unloading device 2, a second guide pipe 60, and a support column 60 that supports the first guide pipe 50 and the second guide pipe 60. Further, the unloading device 2 of the present invention is composed of an adjustment box 10 and a material carrier 40 connected thereto.

[0013] [Adjustment Box 10] FIG. 2 is a plan view of the adjustment box 10 shown in FIG. 1, FIG. 3 is a front view of the adjustment box 10 shown in FIG. 1, FIG. 4 is a rear view of the adjustment box 10 shown in FIG. 1, FIG. 5 is a left - side view of the adjustment box 10 shown in FIG. 1, FIG. 6 is a right - side view of the adjustment box 10 shown in FIG. 1, FIG. 7 is a perspective view of the frame and the guide frame of the adjustment box 10 seen from the back side, and FIG. 8 is a perspective view of the key - shaped plate incorporated in the adjustment box 10 seen from the front. In the figure, 11 is a box frame, 11a is the top panel, 11b is the front panel, 11c is the bottom panel, 11d and 11e are notches, 11f and 11g are insertion holes, 11h is a hook hole, 12a to 12d are guide frames, 13 is a key-shaped plate, 13a is a locking part, 13b is a flat plate part, 13c is a notch, 13d is an insertion hole, 14 is an eyebolt, 14a is a ring, 14b is a shaft part, 14c is a nut, 14d is a washer, 15 is a coil spring, 15a and 15b are hooks, 16 is a ring bar, 17 is a mounting plate, 25 is a fixing bolt, 26 is a nut, 31 is a clamp body, 32 is a clamp piece, 33 and 34 are pins, 35 is a tightening bolt, 36 is a nut, 37 is a mounting bolt, and 38 is a nut. The adjustment box 10 is composed of a box frame 11, guide frames 12a to 12d, a key-shaped plate 13, an eyebolt 14, a coil spring 15, a ring bar 16, a lifting body 20, a clamp 30, etc., and all of these are made of metal. As shown in Fig. 7 etc., the box frame 11 includes a top panel 11a, a front panel 11b, and a bottom panel 11c. The top panel 11a is provided with a notch 11d and an insertion hole 11f, the bottom panel 11c is provided with a notch 11e, an insertion hole 11g, and a hook hole 11h, and an insertion hole (not shown) is provided at a position near the left end of the front panel 11b. Between the top panel 11a and the bottom panel 11c, guide frames 12a, 12b, 12c, and 12d, which are guiding members of the present invention, are attached by welding or the like. The key-shaped plate 13 serves as a locking member of the present invention. As shown in Fig. 8 etc., it consists of a U-shaped locking part 13a with a notch 13c formed therein and a flat plate part 13b continuous therewith, and the flat plate part 13b is provided with an insertion hole 13d. The eyebolt 14 includes a ring 14a and a shaft part 14b, which serve as an engaging part of the present invention. The tip of the shaft part 14b is a threaded part to which a nut 14c is screwed.

[0014] In the adjustment box 10, the locking portion 13a of the key-shaped plate 13 is positioned between the notch 11d on the upper surface plate 11a and the notch 11e on the bottom surface plate 11c of the box frame body 11, and the flat plate portion 13b of the key-shaped plate 13 is positioned so as to be surrounded by the guide frames 12a, 12b, 12c, and 12d. In this way, the key-shaped plate 13 is arranged inside the box frame body 11. The shaft portion 14b of the eye bolt 14 is inserted through the insertion hole 11f on the upper surface plate 11a, the insertion hole 13d on the flat plate portion 13b, and the washer 14d, and the nut 14c is attached to the threaded portion at the tip of the shaft portion 14b. Thereby, the key-shaped plate 13 is assembled to the box frame body 11. And a ring bar 16 is attached to the center of the right end on the lower surface side of the flat plate portion 13b of the key-shaped plate 13. The upper hook 15a of the coil spring 15, which is the biasing member of the present invention, is hooked on the ring bar 16, and the lower hook 15b of the coil spring 15 is hooked on the hook hole 11h of the bottom surface plate 11c of the box frame body 11. Thus, the coil spring 15 is assembled to the box frame body 11 and the key-shaped plate 13. Thereby, when the wire rope 4 hooked on the ring 14a of the eye bolt 14 is pulled up, the eye bolt 14 is lifted, the key-shaped plate 13 is also lifted by the nut 14c, the coil spring 15 is extended, the upper surface of the key-shaped plate 13 comes into contact with the lower surface of the upper surface plate 11a of the box frame body 11, and the key-shaped plate 13 and the box frame body 11 are pulled up by the wire rope 4 and ascend.

[0015] [Lifting body 20] FIG. 9 is a view showing the lifting body 20. FIG. 9(a) is a plan view, FIG. 9(b) is a rear view, FIG. 9(c) is a right side view, and FIG. 9(d) is a cross-sectional view taken along the line X-X of FIG. 9(b). In the figure, 21 is a frame, 21a is a frame body, 21b is an end portion, 21c is a ring portion, 21d is a hole, 22 is a first ball bearing, 23 is a second ball bearing, 24 is a split pin, and GA is a gap portion. The lifting body 20 has a structure including a C-shaped frame 21, a pair of first ball bearings 22, a pair of second ball bearings 23, and a split pin 24. The frame 21 is the ring-shaped frame of the present invention, and is composed of a frame body 21a with a circular cross-section, an end portion 21b, and a ring portion 21c located at a position facing the end portion 21b. A hole 21d is formed in the ring portion 21c. The end portion 21b of the left frame body 21a and the end portion 21b of the right frame body 21a are spaced apart to form a gap portion GA. The first ball bearing 22 is the first rotating body of the present invention, and is fitted on the ring portion 21c side of the frame body 21a, and is arranged in a pair so as to face each other. The second ball bearing 23 is the second rotating body of the present invention, and is fitted into the end portion 21b of the frame body 21a, and is arranged in a pair so as to face each other. In this case, the outer diameter of the end portion 21b is slightly smaller than the outer diameter of the frame body 21a, and the end portion 21b becomes a stepped portion so that the second ball bearing 23 does not move toward the frame body 21a side. The split pin 24 prevents the second ball bearing 23 from falling off, and is inserted into a pin hole provided at the tip of the end portion 21b. Then, the frame 21 is arranged on the bottom plate 11c of the box frame body 11 so that the hole 21d coincides with the insertion hole 11g. The fixing bolt 25 is inserted into the hole 21d and the insertion hole 11g, and the nut 26 is screwed onto the fixing bolt 25, whereby the lifting body 20 is fixed to the box frame body 11. Further, the lifting body 20' shown in FIG. 1 has the same structure as the lifting body 20, but its ring portion 21c is fixed to an L-shaped mounting plate 17 provided with the same insertion hole as the insertion hole 11g by the fixing bolt 25 and the nut 26. By adopting such a structure that the lifting bodies 20 and 20' are provided with a pair of first ball bearings 22 and a pair of second ball bearings 23, the first guide pipe 50 and the second guide pipe 60 (described later) along which the lifting bodies 20 and 20' move up and down (move) can be pipes with a circular cross-section. In this case, the interval of the gap GA is wider than the width of the arm portions (described later) attached to the circumferential surfaces of the first guide pipe 50 and the second guide pipe 60, so that the elevating bodies 20, 20' can pass through the arm portions of the first guide pipe 50 and the second guide pipe 60.

[0016] [Clamp 30] As shown in FIGS. 2 to 6, the clamp 30 includes a clamp body 31, a clamp piece 32, a mounting bolt 37, etc. In the clamp 30, the left end side of the clamp piece 32 is rotatably connected to the left end side of the clamp body 31 by a pin 33, a tightening bolt 35 is rotatably attached to the right end side of the clamp body 31 by a pin 34, and a mounting bolt 37 protrudes outward and is attached to the back side of the clamp body 31. Then, the mounting bolt 37 is inserted into an insertion hole provided at a position near the left end of the front plate 11b of the box frame body 11, and a nut 38 is screwed onto the mounting bolt 37 and tightened, so that the clamp 30 is fixedly attached to the box frame body 11. Also, the clamp 30 is fixedly attached to the mounting plate 17 to which the elevating body 20' is fixed by the mounting bolt 37 and the nut 38. In this case, the vertical pipe (described later) of the material carrier 40 is sandwiched between the clamp body 31 and the clamp piece 32, the right end sides of the clamp body 31 and the clamp piece 32 are opposed to each other, the tightening bolt 35 is passed through a notch on the right end side of the clamp piece 32, and a nut 36 is screwed onto the tightening bolt 35 and tightened, so that the clamp 30 can be clamped and fixed to the vertical pipe of the material carrier 40.

[0017] [Material carrier 40] FIG. 10 is a view showing the vertical frame and the horizontal frame constituting the material carrier 40. FIG. 10(a) is a perspective view of the vertical frame, FIG. 10(b) is a plan view of the vertical frame, and FIG. 10(c) is a perspective view of the horizontal frame. In the figure, 41 is the vertical frame, 42 is the vertical pipe, 43a to 43d are pocket fittings, 44a to 44d are pocket portions, 45 is the horizontal frame, 46 is the horizontal pipe, and 47a, 47b are wedge portions. The vertical frame 41 is a short support column used for a key-shaped scaffold (key-tightened scaffold), and is composed of a vertical pipe 42 and pocket fittings 43a to 43d, etc. The pocket fittings 43a to 43d have a U-shaped horizontal cross-section. Four pocket fittings 43a to 43d are arranged at 90-degree intervals with steps in the circumferential direction of the vertical pipe 42, and pocket portions 44a to 44d are formed between the pocket fittings 43a to 43d and the circumferential surface of the vertical pipe 42. The horizontal frame 45 is a handrail used in combination with the support columns of the key-shaped scaffold. The horizontal pipe 46 is composed of key portions 47a, 47b, etc. Then, by arranging four vertical frames 41 at the corners of a rectangular parallelepiped and fitting the key portions 47a, 47b of the horizontal frame 45 into the opposing pocket portions 44a to 44d of adjacent vertical frames 41, the material carrier 40 shown in Fig. 1 is assembled. Also, as shown in Fig. 1, among the four vertical frames 41 constituting the material carrier 40, the upper side of the vertical pipe 42 of the left-rear vertical frame 41 is clamped and fixed by a clamp 30 attached and fixed to the box frame body 11, and the lower side of the same vertical pipe 42 is clamped and fixed by a clamp 30 attached and fixed to the mounting plate 17. The upper and lower sides of the vertical pipe 42 of the right-rear vertical frame 41 are clamped and fixed by a clamp 30 attached and fixed to the mounting plate 17. As a result, a total of four elevating bodies 20, 20' are attached to the material carrier 40 via the box frame body 11 or the mounting plate 17. On the material carrier 40 configured in this way, various materials constituting the scaffold, specifically, support columns, handrails, tread boards, etc. can be placed.

[0018] [First guide pipe 50, second guide pipe 60, support column 70] Fig. 11 is a view showing the first guide pipe 50, the second guide pipe 60, and the support column 70. Fig. (a) of the same figure is a perspective view of the first guide pipe 50, Fig. (b) of the same figure is a partially enlarged longitudinal sectional view of the first guide pipe 50, Fig. (c) of the same figure is a perspective view of the second guide pipe 60, and Fig. (d) of the same figure is a perspective view of the support column 70. In the figure, 51, 61, 71 are vertical pipes, 52, 62 are arm portions, 53, 63 are key portions, 54 is a hook portion, and 72 is a pocket fitting. The first guide pipe 50 serves as the vertical rod-shaped member of the present invention and is composed of a long vertical pipe 51 with a circular cross-section, an arm portion 52 attached to its peripheral surface, and a wedge portion 52 attached to the tip of the arm portion 52. A number of hook portions 54 formed by recesses are provided on the peripheral surface of the vertical pipe 51. The second guide pipe 60, similar to the first guide pipe 50, is composed of a long vertical pipe 61 with a circular cross-section, an arm portion 62 attached to its peripheral surface, and a wedge portion 62 attached to the tip of the arm portion 62. No hook portions like those of the first guide pipe 50 are provided on the peripheral surface of the vertical pipe 61. The support column 70 is a support column of the wedge-type scaffold and is composed of a long vertical pipe 71 and a pocket fitting 72 attached to its peripheral surface. The pocket fittings 72 are arranged at intervals of 90 degrees with steps in the circumferential direction of the vertical pipe 71, four in number, similar to the pocket fittings 43a - 43d of the vertical frame 41. A pocket portion is formed between each pocket fitting 72 and the circumferential surface of the vertical pipe 51. Then, two support columns 70 are erected on the ground. As shown in FIG. 1, the wedge portion 52 is fitted into the pocket portion of the pocket fitting 72 of one support column 70, and the first guide pipe 50 is attached to the support column 70. The wedge portion 62 is fitted into the pocket portion of the pocket fitting 72 of the other support column 70, and the second guide pipe 60 is attached to the support column 70.

[0019] [Operation of the Cargo Handling System and the Cargo Handling Device] Next, the operation of the cargo handling system 1 and the cargo handling device 2 shown in FIG. 1 will be described. First, attach the first guide pipe 50 to one of the two support columns 70 erected on the ground, and attach the second guide pipe 60 to the other support column 70. Also, attach the box frame body 11 to which the lifting body 20 is fixed and three mounting plates 17 to which the lifting body 20' is fixed to the two vertical pipes 42 on the back side of the material carrier 40. Furthermore, pass the lifting body 20 and the lifting body 20' through the first guide pipe 50 and the second guide pipe 60 (position the first guide pipe 50 and the second guide pipe 60 between the first ball bearing 22 and the second ball bearing 23). In this state, engage one end of the wire rope 4 with the ring 14a of the eyebolt 14 of the adjustment box 10, hook the other end of the wire rope 4 on the hook portion 3 of the lifting device, and lift the wire rope 4 by the lifting device. As a result, the adjustment box 10 is lifted, the elevating bodies 20 and 20' rise along the first guide pipe 50 and the second guide pipe 60, and the material carrier 40 rises. When the lifting of the lifting device is released due to the wire rope 4 breaking or the like, the key-shaped plate 13 is guided by the guide frames 12a to 12d and inclined by the tension of the coil spring 15, and the locking portion 13a is pressed against the circumferential surface of the first guide pipe 50 so as to sandwich the circumferential surface, thereby stopping the descent of the adjustment box 10 and preventing the material carrier 40 from falling.

[0020] FIG. 12 is an explanatory diagram for explaining the state in which the adjustment box 10 is lifted by the lifting device and the state in which the lifting of the lifting device is released. FIG. 12(a) is a rear view of the adjustment box 10 in the lifted state, and FIG. 12(b) is a rear view of the adjustment box 10 in the state where the lifting is released. Now, when one end of the wire rope 4 is engaged with the ring 14a of the eyebolt 14 and the wire rope 4 is lifted by the lifting device, as shown in FIG. 12(a), the eyebolt 14 is lifted by the lifting force W, the nut 14c attached to the shaft portion 14b pushes up the lower surface of the key-shaped plate 13, and the key-shaped plate 13 becomes horizontal and its upper surface contacts the lower surface of the upper plate 11a of the box frame body 11. As a result, the adjustment box 10 is lifted, the elevating body 20 rises along the first guide pipe 50, the elevating body 20' rises along the first guide pipe 50 and the second guide pipe 60, and the material carrier 40 rises. When the adjustment box 10 is lifted and the carrier 40 is ascending, if the wire rope 4 breaks or the like and the lifting of the adjustment box 10 is released, as shown in Fig. 12(b), the eye bolt 14 drops by its own weight, and due to the pulling of the coil spring 15, the ring bar 16 is pulled downward and the key-shaped plate 13 is guided by the guide frames 12a - 12d and tilts. The notch 13c of the locking portion 13a is pressed against the peripheral surface of the first guide pipe 50 so as to sandwich it, thereby stopping the descent of the adjustment box 10 and preventing the drop of the material carrier 40. In this case, since the cross-section of the first guide pipe 50 against which the notch 13c of the key-shaped plate 13 is pressed is circular, compared with a pipe having a rectangular cross-section, the notch 13c of the key-shaped plate 13 can be pressed more strongly against the peripheral surface of the first guide pipe 50, reliably stopping the descent of the adjustment box 10 and reliably preventing the drop of the material carrier 40. Also, since the key-shaped plate 13 tilts without rotating and the notch 13c is pressed against the peripheral surface of the first guide pipe 50, the weight of the material carrier 40 acts on the key-shaped plate 13, and the notch 13c is pressed more strongly against the peripheral surface of the first guide pipe 50, reliably stopping the descent of the adjustment box 10 and reliably preventing the drop of the material carrier 40. Furthermore, when the weight of the material placed on the material carrier 40 is large, the notch 13c of the locking portion 13a pressed against the peripheral surface of the first guide pipe 50 slides on the peripheral surface and the adjustment box 10 descends. However, the notch 13c is hooked on the hooking portion 54 provided on the peripheral surface of the first guide pipe 50, stopping the descent of the adjustment box 10 and reliably preventing the drop of the material carrier 40.

[0021] [Another example of the unloading system] Fig. 13 is a perspective view showing the overall configuration of a unloading system with a different configuration from the unloading system 1 shown in Fig. 1. In the figure, 1' is the unloading system, 2' is the unloading device, 10' is the adjustment box, X is the left - right direction, Y is the front - rear direction, Z is the up - down direction, and the same devices and members as those constituting the unloading system 1 shown in Fig. 1 are given the same reference numerals. The unloading system 1' shown in Fig. 13 has substantially the same configuration as the unloading system 1. However, instead of the mounting plate 17 to which the lifting body 20' and the clamp 30 are fixed on the vertical pipe 42 at the upper right rear of the material carrier 40, an adjustment box 10' to which the lifting body 20 and the clamp 30 are fixed is attached, and on the right support column 70, a first guide pipe 50 is attached instead of the second guide pipe 60, which is different from the unloading system 1. That is, the unloading device 2 in Fig. 1 includes one adjustment box 10, and the adjustment box 10 is lifted by the wire rope 4 hooked on the hook portion 3 of the lifting device, and the material carrier 40 rises. In contrast, the unloading device 2' in Fig. 13 includes two adjustment boxes 10 and 10', and the adjustment box 10 and the adjustment box 10' are lifted by the wire rope 4 hooked on the hook portion 3 of the lifting device, and the material carrier 40 will rise.

[0022] Fig. 14 is a plan view of the adjustment box 10'. In the figure, 11' is the box frame body, and the same members as those constituting the adjustment box 10 shown in Figs. 2 to 6 are given the same reference numerals. As shown in Fig. 14, the adjustment box 10' is different only in that the box frame body 11' has a structure that is symmetric about the left and right with the box frame body 11, and the other configurations are the same. That is, the box frame body 11' includes a top plate, a front plate, and a bottom plate in the same way as the box frame body 11. The top plate is provided with a notch and an insertion hole, and the bottom plate is provided with a notch, an insertion hole, and a hook hole. However, the insertion hole provided in the top plate is located on the left side of the box frame body 11', and the notches provided in the top plate and the bottom plate are located on the right side of the box frame body 11'. As a result, in the adjustment box 10', the key-shaped plate 13 is arranged such that the locking portion 13 is located on the right side of the box frame body 11'. An eyebolt 14 is attached to the left side of the box frame body 11', and the lifting body 20 and the clamp 20 are attached to the right side of the box frame body 11'. The adjustment box 10 and the adjustment box 10' have a left-right symmetric structure. Therefore, as shown in FIG. 13, in the unloading system 1' (unloading device 2'), one end of the wire rope 4 is engaged with the ring 14a of each eyebolt 14 of the adjustment box 10 and the adjustment box 10'. Since the adjustment box 10 and the adjustment box 10' are lifted by the wire rope 4 hooked on the hook portion 3 of the lifting device, the left and right balance of the material carrier 40 is achieved, and the lifting body 20 can move more smoothly along the first guide pipe 50 and the carrier 40 can rise. In this case, even if one of the wire ropes 4 for lifting the adjustment box 10 and the adjustment box 10' breaks and the lifting is released, the other of the adjustment box 10 and the adjustment box 10' can continue to be lifted by the other wire rope 4, preventing the carrier 40 from falling. Also, if both of the wire ropes 4 for lifting the adjustment box 10 and the adjustment box 10' break simultaneously and both liftings are released at the same time, each locking plate 13 of the adjustment box 10 and the adjustment box 10' is pulled by the coil spring 15, and the notch 13c of each locking portion 13a is pressed against the circumferential surface of each first guide pipe 50 so as to sandwich it. However, the carrier 40 tilts to either the left or the right, and since the directions in which the locking plates 13 of the adjustment box 10 and the adjustment box 10' tilt are opposite to each other, a force to tilt further acts on the locking plate 13 that tilts in the same direction as the direction in which the carrier 40 tilts due to the self-weight of the carrier 40. As a result, the force (pressing force) for the locking plate 13 to bite into the circumferential surface of the first guide pipe 50 increases. Together with the notch 13c of the locking plate 13 being hooked on the hooking portion 54 provided on the circumferential surface of the first guide pipe 50, the fall of the carrier 40 is more reliably prevented.

Industrial Applicability

[0023] The unloading device of the present invention is an unloading device that raises and lowers a material carrier loaded with materials along a vertical rod-shaped member by means of a winch or the like, and is provided with a fall prevention mechanism using a contact member that contacts the vertical rod-shaped member. The contact member is difficult to slide with respect to the vertical rod-shaped member, and the contact member can be strongly pressed against the vertical rod-shaped member. Also, the contact member is prevented from sliding with respect to the vertical rod-shaped member, so that the fall of the loading platform can be surely prevented, and it can be used to transport the materials used for assembling the scaffold to a high place.

Explanation of Signs

[0024] 1 Unloading system 2 Unloading device 3 Hook portion of lifting device 4 Wire rope 10 Adjustment box 11 Box frame body 11a Top panel 11b Front panel 11c Bottom panel 11d, 11e Notch 11f, 11g Insertion hole 11h Hook hole 12a~12d Guide frame 13 Key-shaped plate 13a Lock portion 13b Flat plate portion 13c Notch 13d Insertion hole 14 Eye bolt 14a Ring 14b Shaft portion 14c Nut 14d Washer 15 Coil spring 15a, 15b Hook 16 Ring bar 17 Mounting plate, 20, 20’ Lifting body 21 Frame 21a Frame body 21b End portion 21c Ring portion 21d Hole 22 First ball bearing 23 Second ball bearing 24 Split pin 25 Fixing bolt 26 Nut 30 Clamp 31 Clamp body 32 Clamp piece 33, 34 Pin 35 Tightening bolt 36 Nut 37 Mounting bolt 38 Nut 40 Material carrier 41 Vertical frame 42 Vertical pipe 43a - 43d Pocket fitting 44a - 44d Pocket part 45 Horizontal frame 46 Horizontal pipe 47a, 47b Wedge part 50 First guide pipe 51 Vertical pipe, 52 Arm part 53 Wedge part 54 Hooking part 60 Second guide pipe 61 Vertical pipe 62 Arm part 63 Wedge part 70 Support column 71 Vertical pipe 72 Pocket fitting GA Gap part

Claims

1. A unloading device comprising an adjustment box that moves up and down along a vertical rod-shaped member with a circular cross-section, and a material carrier connected to the adjustment box, wherein the adjustment box includes a box frame body having an upper panel, a lifting body that moves up and down on the circumferential surface of the vertical rod-shaped member, and a fall prevention mechanism for preventing the fall of the material carrier, the fall prevention mechanism includes an engaging portion that engages with a lifting member of a lifting device for lifting the adjustment box, a locking member that is pressed against the circumferential surface of the vertical rod-shaped member so as to sandwich the circumferential surface of the vertical rod-shaped member when the lifting of the lifting member is released, a biasing member that inclines the locking member and presses the locking member against the circumferential surface of the vertical rod-shaped member, and a guide frame attached to the upper panel for guiding the locking member to incline without rotating and is characterized in that when the lifting member is pulled up and the engaging portion is lifted, the locking member is lifted, the locking member contacts the upper panel and the locking member and the box frame body rise, and when the lifting of the lifting member is released, the locking member inclines without rotating by the biasing force of the biasing member, the locking member is pressed against the circumferential surface of the vertical rod-shaped member, and the weight of the material carrier acts on the locking member so as to increase the pressing of the locking member against the circumferential surface of the vertical rod-shaped member. Unloading device.

2. The locking member is a key-shaped plate composed of a locking portion formed with a notch and a flat plate portion continuous with the locking portion, the key-shaped plate is arranged in the box frame body such that the flat plate portion comes to a position surrounded by the guide frame, and when the lifting of the lifting member is released, the key-shaped plate inclines without rotating by the biasing force of the biasing member, and the notch is pressed against the circumferential surface of the vertical rod-shaped member. The unloading device according to claim 1.

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