Entanglement prevention tool for metal wheel

Abstract

To provide an entanglement prevention tool for a metal wheel, which can be fitted to the metal wheel more easily within a short time than conventionally as a separate tool not affecting the manufacturing process of the metal wheel itself.SOLUTION: An entanglement prevention tool 1 for a metal wheel comprises a box-like body 2 formed by connecting the edges of lower end regions of first and second cover plates 10 and 20 on a bottom plate 40. The box-like body 2 is provided with an opening 3 through which the metal wheel can enter into / exit from the upper end regions, first and second lid plate members 30a and 30b that openably close the left and right regions excluding the center m of the opening 3, and locking means 35 and 15 for releasably fixing the closed states of the lid plate members. The bottom plate 40 is provided with rope insertion holes 42a and 42b through which both end sides of a rope R wound around the metal wheel are inserted and suspended.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an entanglement prevention device for a pulley wheel that is attached to the pulley wheel to prevent fingers from getting entangled in the pulley wheel. [Background technology]

[0002] During power transmission line installation work, the following steps are carried out: first, connect the electric wire to a wire rope that has been stretched in advance, and then, as the wire rope is wound up, pay out the electric wire from the drum and string the electric wire between the pylons. After stringing, the electric wire is attached to the insulators of the pylons while adjusting the wire so that it has the slack required by the design.

[0003] In each operation of such overhead line construction, a wire rope attached to a pulley is used to pull up and down tools, materials, etc. to workers standing high up on the tower.

[0004] As shown in FIG. 8, for example, a pulley 110 is sandwiched between a pair of support plates 120, and is supported by a rotating shaft 140 so as to be freely rotatable between a pair of frame bodies 130 that extend vertically from the outside to surround the pair of support plates 120 at their central positions. The pulley 100 is suspended at a predetermined position by a support hook F that is erected between the upper ends of the pair of frame bodies 120.

[0005] Usually, one of the upper parts of the frame body 120 has a door structure that can be opened and closed, and with this upper part open, the wire rope R can be wound around the pulley 110. In addition, an auxiliary hook fs is provided between the lower ends of the pair of frame bodies 120.

[0006] Such a pulley 100 is used, for example, to lift and lower tools, materials, etc. between a high place and the ground by means of a wire rope R wound around the pulley 110.

[0007] However, when using this pulley 100, there have been accidents in which the worker's fingers have been caught between the moving wire rope R and the rotating pulley 110.

[0008] In order to prevent fingers from becoming entangled, various prevention devices have been devised that are attached to the pulley so as to cover the entanglement area EA between the wire rope R and the surface of the pulley 110. For example, a pulley with entanglement prevention devices has been devised in which two cover plates having a larger outer shape than the support plates that sandwich the pulley are fixed to the outer surfaces of both sides of the pulley so that fingers cannot reach the entanglement area EA (see, for example, Patent Documents 1 and 2).

[0009] As disclosed in Patent Document 3, there is also an anti-entanglement device that is attached to the iron wheel separately and is made up of two side plates that have a width greater than the side width of the iron wheel and have a gap between their lower edges and are connected by a hinge.The two side plates are closed to sandwich the iron wheel and cover the sides, and the upper parts are fixed together with connecting holes and binding wires. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Utility Model Registration No. 3233879 [Patent Document 2] JP 2023-9431 A [Patent Document 3] Utility Model Registration No. 3233844 Summary of the Invention [Problem to be solved by the invention]

[0011] However, in a pulley with a protective device, in which two cover plates are each fixed to a support plate that sandwiches the pulley, the protective device is an integrated product, so it is always larger and heavier than a normal pulley, making it inconvenient to transport and store when not in use.

[0012] Furthermore, because the rope is attached to the pulley with the protective device attached, it becomes necessary to form a portion on at least one of the cover plates that corresponds to the opening and closing of the door structure of the support plate, and to provide a mechanism for displacing any part that becomes an obstacle when attaching the rope, which requires additional complicated design and manufacturing.

[0013] Because the manufacturing process of the protective device with such a complicated mechanism and the process of installing it are included in the manufacturing process of the pulley with the protective device, there is a risk that the number of processes and parts will increase, reducing the efficiency of the entire manufacturing process of the pulley.

[0014] In addition, the preventive device, which is separate from the caster wheel and is attached by sandwiching the caster wheel between two side plates, is closed by wrapping the two side plates around the caster wheel from below while the two side plates are open, and then the opposing upper parts are butted together and fixed in place. This requires the unstable jig to be held by hand in the clamping position of the caster wheel, which is a cumbersome task, making the installation process extremely cumbersome and inefficient.

[0015] In view of the above problems, the object of the present invention is to provide a entanglement prevention device for a pulley which can be attached to a pulley more easily and in a shorter time than conventional devices as a separate jig that does not affect the manufacturing process of the pulley itself. [Means for solving the problem]

[0016] In order to achieve the above object, the invention of claim 1 provides a tangle-prevention device for a tangle wheel that is detachably attached to a tangle wheel, as shown in, for example, Figs. 1, 5, 6, and 7, which: The box-shaped main body includes a first cover plate and a second cover plate that face each other and have a width larger than the side shape of the iron wheel and substantially the same outer shape, and a bottom plate that connects the edges of the lower end regions of the first and second cover plates to each other, forming a space for accommodating the iron wheel inside, the box-shaped main body has an opening between the edges of the upper end regions of the first and second cover plates through which the metal wheel can be inserted and removed, a first cover plate member and a second cover plate member which can be opened and closed and rotated to close the left and right regions of the opening except for the center, and a locking means which releasably fixes the first and second cover plate members in a closed state, The bottom plate is characterized in that it has two rope insertion holes formed therein, through which both ends of the rope wound around the pulley are inserted outward and hung down when the pulley is stored inside the box-shaped main body.

[0017] According to the entrapment prevention device for a metal wheel according to claim 1 of the present invention, the edges of the lower end regions of the first and second cover plates are connected by a bottom plate to form a box-shaped main body, and a storage space for the metal wheel is formed inside the box-shaped main body. Therefore, there is no need to rotate the cover plates together and hold the metal wheel enclosed by hand as in the conventional method, and the metal wheel can be easily attached to the metal wheel in a short time by simply inserting the metal wheel into the storage space inside from the opening at the top of the box-shaped main body, which is in a stable fixed form, and closing the left and right regions of the opening with the first and second cover plate members, respectively, and fixing them with a locking means.

[0018] At this time, the first and second cover plate members, which close the left and right areas of the opening and are fixed, are hooked onto the left and right shoulders of the pulley, thereby achieving a substantial attachment state to the pulley. At this time, the first and second cover plate members cover the left and right areas of the center of the opening from which the pulley's support hooks protrude, i.e., the area where the rope moves while wrapped around the pulley. Therefore, at the same time as attaching this pulley entrapment prevention device, a state is achieved in which the risk of the worker's fingers reaching the entrapment position where the rope contacts the pulley is almost completely avoided, and excellent entrapment prevention function is demonstrated.

[0019] When the pulley is inserted into the box-shaped body, the rope wound around the pulley of the pulley can be passed through a through hole formed in the bottom plate to hang down from the box-shaped body. If an auxiliary hook is provided at the lower end of the center of the pulley, the bottom plate may also be provided with an auxiliary hook through hole for projecting the auxiliary hook.

[0020] In the entanglement prevention device for a pulley according to the invention described in claim 2, for example, as shown in Figs. 1, 2 and 3, each of the first and second cover plates has an upper portion having an isosceles trapezoidal shape, Each of the first and second cover plate members has a rectangular plane that covers the left and right regions of the opening between the left and right leg sides of the opposing upper isosceles trapezoids, and one long side of each rectangular shape is rotatably attached to the left and right leg sides of the second cover plate, and the other long side is fixed to the surface side of the first cover plate by the locking means.

[0021] According to the entrapment prevention device for a pulley wheel set forth in claim 2 of the present invention, the upper parts of the first and second cover plates are each formed into an isosceles trapezoid shape. In the entrapment prevention device for a pulley wheel of the present invention, the first and second cover plate members cover the area between the rope and the pulley wheel in which fingers may become entangled, so the cover plate itself does not need to deviate significantly in contour from the outer shape of the pulley wheel, and can be shaped efficiently to match the outer shape of the pulley wheel.

[0022] Therefore, since the external shape of a typical iron wheel as shown in Figure 8 is approximately diamond shaped, by making the upper part, which functions as the hooking part for the iron wheel and the entanglement prevention part, into an isosceles trapezoid shape that roughly follows the diamond shape of the iron wheel, the upper parts of the first and second cover plates can be kept to an efficient area that is sufficient to perform the required function while having no wasted area.

[0023] In this case, the upper base and the left and right leg sides of each of the upper isosceles trapezoids of the first and second cover plates form the upper end regions, and the opening of the box-shaped main body is formed between them. Therefore, if the first and second cover plate members each cover the opening between the left leg sides and the right leg sides of the upper isosceles trapezoids facing each other, the space between the upper base sides of the upper isosceles trapezoids facing each other becomes the center of the opening, and the support hook of the metal wheel can be protruded as a substantially rectangular opening that is not blocked by the first and second cover plate members. Since the opening end surfaces between the left leg sides and the right leg sides on both the left and right sides of the center of this opening are rectangular, the first and second cover plate members may also have similar rectangular flat surfaces to block the openings on both the left and right sides.

[0024] Therefore, each cover plate member having a rectangular plane has one long side portion rotatably attached to the left and right leg sides of the second cover plate and the other long side portion fixed to the surface side of the first cover plate by an engaging means, thereby providing an opening and closing mechanism for both the left and right sides of the opening.

[0025] The entrapment prevention device for a metal wheel according to the invention described in claim 3 is characterized in that, for example, as shown in Figures 1, 2 and 3, the lower part of each of the first and second cover plates has an isosceles trapezoid shape that is in the opposite direction to the isosceles trapezoid shape of the upper part, and the outline of the entire cover plate is approximately hexagonal.

[0026] According to the entrapment prevention device for metal wheels described in claim 3 of the present invention, each of the first and second cover plates has an isosceles trapezoid shape not only at the upper part but also at the lower part, which is in the opposite direction to the isosceles trapezoid shape of the upper part, so that the contour of the entire cover plate is approximately hexagonal, thereby making it possible to reduce the area of ​​the required cover plate to a more efficient level with less waste.

[0027] Therefore, the lower parts of the first and second cover plates also have contours that follow the approximate diamond shape of a typical wheel. The bottom plate connects the edges of the lower end regions of the first and second cover plates so as to close the lower opening between the first and second cover plates, but in the present invention, the edges of the lower end regions of both cover plates form the contour edges consisting of the upper base and left and right leg edges of the lower isosceles trapezoid.

[0028] The bottom plate has a central region that closes the gap between the upper base sides of the lower isosceles trapezoid and left and right regions that communicate with both ends of the central region at an angle, and can be easily manufactured by simply adding an angle to a single piece of material. This type of bottom plate can be easily attached to the edges of the lower end regions of both cover plates, making the connection and fixing work easy.

[0029] Furthermore, as shown in Figures 4(a) and (b), the auxiliary hook insertion hole and the two rope insertion holes provided in the bottom plate can be easily installed in the entanglement prevention device by forming the auxiliary hook insertion hole in the central region of the single plate member of the bottom plate and the rope insertion holes in each of the left and right regions in advance, and then simply fixing them to the lower ends of both cover plates at an angle as described above.

[0030] In the entrapment prevention device for a metal wheel according to the invention described in claim 4, for example, as shown in Figs. 1 to 7, each of the first and second cover plate members is attached to an edge portion of the second cover plate so that one of the long sides is rotatably connected to the edge portion of the second cover plate via a hinge, The locking means is a hook portion having a protruding hook portion provided on a longitudinal side portion of each of the first and second cover plate members on a side opposite to the hinge; The snap lock is characterized by comprising a hook portion having a hook rod attached to the surface of the first cover plate and hooked to the hook portion when the first and second cover members are each blocking the opening, and a lever to which the hook rod is connected and which rotates to displace the hook rod between a fixed hook state and a released hook state.

[0031] According to the entrapment prevention device for a metal wheel described in claim 4 of the present invention, one of the long sides of the first and second cover plate members is rotatably attached to the edge of the second cover plate via a hinge, so that by simply rotating it outward, the entire opening at the top of the box-shaped main body can be exposed, making it easy to insert the metal wheel.

[0032] After the pulley is stored inside the box-shaped main body, it is possible to close and seal both the left and right areas of the opening and cover the entanglement area between the pulley and the rope simply by rotating it to the opposite side. The first and second cover members are fixed in their closed state with a locking means, and the attachment of the entanglement prevention device to the pulley is immediately completed.

[0033] Here, a snap lock is used as the locking means, which is a simple and inexpensive mechanism that allows the locking process to be completed easily and in a short time. The snap lock is composed of a hooked part with a hook part provided on the lid side that opens and closes, and a locking part that displaces a locking bar that is attached to the main body side and hooked on the hook part when the lid side is closed between a locked state and a released state by rotating a lever. The locked state of the snap lock is generally maintained by tension provided by a spring.

[0034] Therefore, in the present invention, by providing a hook portion on the long side opposite the hinge of the first and second cover plate members that open and close, and attaching a latch portion to the corresponding surface position of the first cover plate, a snap lock can be constructed that releasably engages and fixes the first and second cover plate members to the box-shaped main body in a closed state.

[0035] With this type of snap lock, after the metal wheel is inserted into the box-shaped main body through the opening at the top, the left and right regions of the opening can be closed by rotating the first and second cover plate members, which immediately locks and secures both cover plate members. This means that the anti-entrapment device can be easily attached to the metal wheel and stably fixed in place in a short amount of time.

[0036] In addition, the snap lock stably maintains the fixed state after the entanglement prevention device is attached to the pulley, but the fixation can be released immediately by simply rotating the lever of the hook in the opposite direction. Therefore, after the pulley is used, the entanglement prevention device can be easily removed from the pulley in a short time, and both can be easily removed, transported, and stored. Effect of the Invention

[0037] As described above, the entrapment prevention device for a chain wheel according to the present invention has a box-shaped body formed by connecting the edges of the lower end regions of the opposing first and second cover plates with a bottom plate to form a stable fixed form, and the chain wheel can be easily attached to the chain wheel and simultaneously prevented from being entrapped by simply inserting the chain wheel into the internal storage space through the opening at the top of the box-shaped body and closing the left and right regions of the opening with the first and second cover plate members to fix them in a sealed state.This has the effect of allowing the chain wheel to be attached more easily, in a shorter time, and more efficiently than conventional methods, as a detachable entrapment prevention device separate from the chain wheel, without any effect on the manufacturing process of the chain wheel itself. [Brief description of the drawings]

[0038] [Figure 1] FIG. 1 is a schematic overall diagram showing one embodiment of an entanglement prevention device for a metal wheel according to the present invention, in which (a) is an oblique view showing a state in which the opening of the box-shaped main body is closed by first and second cover plate members, and (b) is an oblique view showing a state in which the opening of the box-shaped main body is open. [Diagram 2] 1(b) is a perspective view showing a state in which the first and second cover plate members are further rotated outwardly from the state shown in FIG. [Diagram 3] 2A and 2B are front views of the entanglement prevention device for a metal wheel shown in FIG. 1, in which (a) is a view showing a state in which the first and second cover plate members are closed, and (b) is a view showing a state in which the first and second cover plate members are open. [Figure 4] 2A and 2B are bottom views of the entanglement prevention device for metal wheels shown in FIG. 1, in which (a) is a view showing a state in which the first and second cover plate members are closed, and (b) is a view showing a state in which the first and second cover plate members are open. [Diagram 5] 2 is a front view of the entanglement prevention device for a metal wheel shown in FIG. 1 with the metal wheel housed in the box-shaped main body and the first and second cover plate members open. FIG. [Figure 6] 6 is a front view showing the entanglement prevention device for a metal wheel in which the metal wheel shown in FIG. 5 is housed in a box-shaped main body, in a completely installed state in which the first and second cover plate members are closed and fixed. [Figure 7] FIG. 7 is a perspective view of the entanglement prevention device for a metal wheel in the completely installed state shown in FIG. 6. [Figure 8]FIG. 1 is a schematic front view illustrating a conventional use state of a pulley wheel without an entanglement prevention device for the pulley wheel. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0039] An embodiment of the present invention will now be described with reference to the drawings.

[0040] <Embodiment Mode> 1 to 7 show one embodiment of the entrapment prevention device for a pulley according to the present invention. As shown in Figs. 1, 2 and 3, the entrapment prevention device 1 in this embodiment is equipped with a box-shaped main body 2 having a space for accommodating the pulley 100 formed therein by a first cover plate 10 and a second cover plate 20 which face each other and have substantially the same outer shape, and a bottom plate 40 which connects the edges of the lower end regions of the first and second cover plates (10, 20).

[0041] An opening 3 through which the pulley 100 is inserted and removed is formed between the upper end regions of the first and second cover plates (10, 20) at the top of the box-shaped main body 2. The left and right regions of this opening 3, excluding a central portion m, are closed by a first cover plate member 30a and a second cover plate member 30b so as to be able to open and close.

[0042] Then, when these first and second cover plate members (30a, 30b) are closed and fixed by a locking means (to be described later), the attachment of the entanglement prevention device for a metal wheel 1 to the metal wheel 100 is completed.

[0043] In this embodiment, the first and second cover plates (10, 20) have approximately the same contour shape, and as shown by the diagonal line area in Figure 3(b), each has an isosceles trapezoidal shape (U, L) in opposite directions with the upper and lower parts connected at their bottom bases, and each cover plate (10, 20) has an overall contour that is approximately hexagonal.

[0044] Therefore, the box-shaped main body 2 has an outer shape that roughly follows the approximate diamond shape of the pulley 100, and each of the cover plates (10, 20) has an area that is minimally wasted.

[0045] In this case, the upper end region of the first cover plate 10 is made up of the upper base 12 and left and right leg sides (11a, 11b) of the upper isosceles trapezoid U, and the lower end region is made up of the lower base 13 and left and right leg sides (14a, 14b) of the lower isosceles trapezoid L. Similarly, the upper end region of the second cover plate 20 is made up of the upper base 22 and left and right leg sides (21a, 21b) of the upper isosceles trapezoid U, and the lower end region is made up of the lower base 23 and left and right leg sides (24a, 24b) of the lower isosceles trapezoid L.

[0046] Therefore, the opening 3 of the box-shaped main body 2 is formed between the upper end region (11a, 12, 11b) of the first cover plate 10 and the upper end region (21a, 22, 21b) of the second cover plate 20.

[0047] The space between the opposing upper base sides (12, 22) forms a center m of the opening 3, and the opening end faces formed between the left leg sides (11a, 21a) and between the right leg sides (11b, 21b) on both the left and right sides of this center m are rectangular. The first and second cover plate members (30a, 30b) have rectangular flat surfaces that close the rectangular openings on both the left and right sides, respectively.

[0048] Furthermore, the central portion m, which is not blocked by the first and second cover plate members (30a, 30b), allows the support hook F to protrude outside the box-shaped main body 2 when the present anti-entanglement device 1 for a metal wheel is attached to the metal wheel 100.

[0049] In this embodiment, each of the first and second cover plate members (30a, 30b) has a U-shaped cross section with extensions (31a, 32a), (31b, 32b) rising perpendicularly from both longer sides of the rectangular plane.

[0050] Each cover plate member (30a, 30b) is rotatably attached at one of its extension portions (31a, 31b) to the vicinity of the left and right leg sides (21a, 21b) of the upper isosceles trapezoid U of the second cover plate 20 via hinges (33a, 33b) as shown in Figure 4.

[0051] As shown in FIG. 2, by using the hinges (33a, 33b), each cover plate member (30a, 30b) can be rotated to a position far away from the opening 3, so that there is no interference when inserting the pulley 100 into the opening 3, and therefore the pulley entrapment prevention device 1 can be smoothly attached to the pulley 10.

[0052] In this embodiment, a spring-loaded snap lock is provided as a locking means for releasably fixing the first and second cover plate members (30a, 30b) in the closed state. Hook portions 35 of the latched portions constituting each snap lock are attached to the ends of the extension portions (32a, 32b) on the opposite side to the hinges (33a, 33b) of each cover plate member (30a, 30b), and latch portions 15 of the snap locks are attached to the surface of the first cover plate 10.

[0053] In the unlocked state, the lever 17 of the corresponding hanging portion 15 is raised in a direction away from the surface of the first cover plate 10 onto the hook portion 35 of each closed cover plate member (30a, 30b), and then the hanging rod 16 connected to the lever 17 is hooked onto the hook portion 35 of the corresponding cover plate member (30a, 30b), and the lever 17 is then rotated and lowered until it reaches the surface of the first cover plate 10, thereby entering the locked hanging state.

[0054] The lower surface of the box-shaped main body 2 is formed with an opening area extending between the lower end region (14a, 13, 14b) of the first cover plate 10 and the lower end region (24a, 23, 24b) of the second cover plate 20, and this opening area is closed by a bottom plate 40.

[0055] The bottom plate 40 has an auxiliary hook insertion hole 41 formed in the center, and rope insertion holes (42a, 42b) formed in the left and right regions thereof. Each rope insertion hole (42a, 42b) has an elongated shape extending along the left and right width direction of the box-shaped main body 2, and can allow left and right movement of the rope R inserted within this width.

[0056] Furthermore, the entrapment prevention device 1 for a pulley wheel according to this embodiment must maintain its shape and effectively prevent fingers from becoming entrapped, and considering that it will be attached and detached from the pulley wheel 100 and used repeatedly, it must be made of a material that can provide a certain level of mechanical strength, especially to the box-shaped main body 2.

[0057] As long as the mechanical strength requirement is met, there are no particular limitations on the constituent materials; however, since the box-shaped main body 2 is constructed by molding the constituent parts, i.e., the first and second cover plates (10, 20), the bottom plate 40, and the first and second lid plate members (30a, 30b), each of which has a specific shape, and joining these together, and the hinges (33a, 33b), the snap lock hook portion 35, and the latch portion 15 are fixed to the box-shaped main body 2, it is desirable to use a material that allows each operation to be performed relatively easily and at low cost.

[0058] For example, a suitable material would be a thin metal plate such as stainless steel, which can be manufactured relatively easily using common work processes such as punching or cutting and forming each component and fastening the components by riveting, and its corrosion resistance is suitable for repeated outdoor use.

[0059] The procedure for mounting the entanglement prevention device 1 having the above-mentioned configuration according to this embodiment onto the pulley 100 is as follows.

[0060] First, the pulley 100 is hung appropriately by the support hook F, and the rope R is wound around the pulley 110. The first and second cover plate members (30a, 30b) are rotated outward as far as possible relative to this pulley 100 to fully expose the opening 3 of the box-shaped main body 2, and then the box-shaped main body 2 is placed over the pulley 100 from below.

[0061] As a result, the pulley 100 is relatively inserted into the box-shaped body 2 through the opening 3. The pulley 100 is inserted by inserting both ends of the rope R wound around the pulley 110 into the left and right rope insertion holes (42a, 42b) of the bottom plate 40 and hanging them down to the outside.

[0062] When most of the metal wheel 100 is fitted inside the box-shaped main body 2 and the auxiliary hook fs provided at the lower end of the metal wheel 100 is inserted to a position where it protrudes downward from the auxiliary hook insertion hole 40 in the center of the bottom plate 40, the first and second cover plate members (30a, 30b) are rotated to close the left and right regions of the opening 3.

[0063] With each cover plate member (30a, 30b) closing the left and right regions of the opening 3, by hooking the locking rod 16 onto the hook portion 35 of each snap lock and rotating and lowering the lever 17, each cover plate member (30a, 30b) is engaged and fixed to the front surface side of the first cover plate 10, and at the same time, the first and second cover plate members (30a, 30b) are hooked onto both shoulder portions of the support plate 120 of the castor wheel 100, thereby achieving the attached state of the entrapment prevention device 1 for castor wheels.

[0064] With only a few simple steps as described above, the attachment of the pulley entrapment prevention device 1 according to this embodiment to the pulley 100 can be easily completed. After the attachment of the pulley entrapment prevention device 1 is complete, if the pulley 100 is hung via the support hook F at a high place where it will actually be used, it can be used to raise and lower tools and materials by raising and lowering the rope R.

[0065] At that time, the entrapment area EA is covered by the entrapment prevention device 1 for the metal car, so there is no risk of the worker's fingers becoming entangled between the pulley 120 and the rope R, ensuring high work efficiency and high safety at the same time.

[0066] In addition, when removing the pulley 100 after work is completed, the pulley entrapment prevention device 1 can be removed from the pulley 100 simply by releasing each snap lock and rotating and opening the first and second cover plate members (30a, 30b).

[0067] Therefore, the metal wheel 100 and the metal wheel entrapment prevention device 1 can be transported and stored separately, and handling is easy. [Industrial Applicability]

[0068] The entanglement prevention device for pulleys according to the present invention can be applied not only to pulleys used in power transmission line stringing work, but also to pulleys that are suspended in a variety of situations. [Explanation of symbols]

[0069] 1: Entrapment prevention device for metal car 2: Box-shaped body 3: Opening m: Center of the opening 10: First cover plate 20: Second cover plate U: Upper isosceles trapezoid shape L: Lower isosceles trapezoid shape 12,22: Upper base (upper isosceles trapezoid shape) 11a, 11b, 21a, 21b: Leg sides (upper isosceles trapezoid shape) 13,23: Upper base (lower upper isosceles trapezoid shape) 14a, 14b, 24a, 24b: Leg sides (lower part isosceles trapezoid shape) 15: Locking part (snap lock) 16: Locking rod (snap lock) 17: Lever (Snap lock) 30a, 30b: Lid plate member 31a, 32a, 31b, 32b: Extension part 33a, 33b: hinge 35; Hook part (snap lock) 40: Bottom plate 41: Auxiliary hook insertion hole 42a, 42b: Rope insertion holes 100: Gold wheel 110: Pulley 120: Support plate 130:Frame body 140: Rotation axis F: Support hook fs: Auxiliary hook R: Rope EA: Entrapment area

Claims

1. In the entanglement prevention device for a pulley which is detachably attached to the pulley, The box-shaped main body has a space for accommodating the iron wheel formed therein by a first cover plate and a second cover plate facing each other and having a width larger than the side shape of the iron wheel and substantially the same outer shape, and a bottom plate connecting the edges of the lower end regions of the first and second cover plates, the box-shaped main body has an opening between the edges of the upper end regions of the first and second cover plates through which the metal wheel can be inserted and removed, a first cover plate member and a second cover plate member which can be opened and closed and rotated to close the left and right regions of the opening except for the center, and a locking means which releasably fixes the first and second cover plate members in a closed state, This is an entanglement prevention device for a metal wheel, characterized in that the bottom plate is formed with two rope insertion holes through which both ends of the rope wound around the metal wheel are inserted outward and hung down when the metal wheel is stored inside the box-shaped main body.

2. Each of the first and second cover plates has an upper portion having an isosceles trapezoidal shape; The entrapment prevention device for a metal wheel as described in claim 1, characterized in that each of the first and second cover plate members has a rectangular plane that covers the left and right regions of the opening between the left and right leg sides of the upper isosceles trapezoidal shapes facing each other, and one long side of each rectangular shape is rotatably attached to the left and right leg sides of the second cover plate, and the other long side is fixed to the surface side of the first cover plate by the locking means.

3. 3. The entrapment prevention device for metal wheels according to claim 2, wherein the lower portion of each of the first and second cover plates has an isosceles trapezoid shape that is inverse to the isosceles trapezoid shape of the upper portion, and the contour of the entire cover plate is substantially hexagonal.

4. Each of the first and second cover plate members has one of the long sides pivotally attached to an edge of the second cover plate via a hinge, The locking means is a hook portion having a protruding hook portion provided on a longitudinal side portion of each of the first and second cover plate members on a side opposite to the hinge; The entrapment prevention device for a metal wheel as described in claim 1 or 2, characterized in that it is a snap lock comprising a hanging portion having a hanging bar attached to the surface of the first cover plate and hooked to the hook portion when the first and second cover members are each blocking the opening, and a lever to which the hanging bar is connected and which rotates to displace the hanging bar between a fixed hanging state and a released state.

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