Cable drum runaway prevention fixture

Abstract

To provide a cable drum runway prevention fixture which can satisfactorily execute temporary rolling restriction relative to plural kinds of cable drums with different outer diameters without enlarging the whole configuration thereof.SOLUTION: A cable drum runaway prevention fixture comprises: a square bar-shaped stopping member (2) which is arranged so as to be fitted into a space with a lower mounting face of a pair of flame plates of a cable drum (100); a strut member (3) which is erected from one end part of the stopping member (2) and fitted along an outer surface of the one flame plate (102A); a tubular member (5) mounted on the strut member in an orthogonal direction and inserted into a shaft hole (103) of the flame plate (102A); and a lock device (10) locked at an upper end part of the flame plate (102A) at a tip side of the strut member and releasably hanging and fixing the flame plate (102A) and the strut member (3). The tubular member (5) is slidably and releasably fixed along the strut member (3), and the lock device (10) is slidable along the strut member (3) in a released state.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cable drum escape prevention jig that is attached to a cable drum to temporarily prevent the cable drum from rolling off the loading surface of the platform of a tailgate lifter, for example, when loading or unloading a cable drum for electric wires using the tailgate lifter attached to the rear of a truck bed. [Background technology]

[0002] Electric wires used in overhead line construction are wound around large bobbin-like cable drums.

[0003] For example, as shown in Figure 9, such a cable drum 100 is composed of a cylindrical body 101 and a pair of disk-shaped flanges (102A, 102B) attached to both ends of the body 101, with the flanges having a larger diameter than the body 101. In addition to wooden ones, plastic ones using polypropylene are commonly used. In large ones, the outer diameter D of the flanges can be 1 m or more, and even exceed 2 m.

[0004] These cable drums are transported by truck, but for particularly large ones, lifting equipment such as a crane truck is used for loading and unloading. For cable drums large enough for people to handle, trucks equipped with tailgate lifters are used for transporting to sites where no lifting equipment is available.

[0005] A tailgate lifter is a lifting device attached to the rear of a loading platform that raises and lowers the platform on which cargo is placed. That is, the platform is driven to rise and fall vertically or by a rotating arm so that the loading surface can be moved between a height position where it is roughly flush with the loading platform surface and the ground.

[0006] Therefore, when the platform is lowered onto the ground, the load can be smoothly moved horizontally from the ground to the loading surface, and when the platform is raised, the load can be easily moved horizontally from the loading surface to the loading platform. This makes it easy to load and unload large or heavy loads onto the loading platform, and reduces the burden on the worker.

[0007] Normally, cable drums that are too heavy for a person to lift easily are moved by rolling a pair of flanges like wheels with the central axis of the body horizontal. Therefore, they are placed in the same orientation on the platform of the tailgate lifter, and are raised and lowered in a state that makes them prone to rolling when an external force is applied. A cable drum raised and lowered in this state may roll off the platform and run away, and this is more dangerous the larger and heavier the cable drum.

[0008] On the other hand, some tailgate lifters are provided with a stopper 310 that is provided near the rear edge of a platform 300 and is capable of freely moving in and out of a placement surface 301, as shown in Fig. 9. This stopper 310 is positioned at a retracted position and a protruding position by an elastic means (see, for example, Patent Documents 1 and 2).

[0009] However, such stopper 310 has a relatively small protruding height and is intended for small-diameter wheels such as wheels of dollies and casters of containers, and can easily be overcome by the flanges (102A, 102B) of the cable drum 101. Moreover, this stopper 310 has the drive device for the elastic means built into the mounting surface, and it is not practical to enlarge the stopper 310 to accommodate a large-diameter object such as the cable drum 101.

[0010] Therefore, in order to prevent the cable drum placed on such a platform from running away, a dedicated cable drum ratchet that is temporarily placed on the platform as a separate unit has been considered, as shown in Patent Document 3. In this case, anti-rotation members are placed on the front and rear of the contact surface of the cable drum flange and are provided perpendicular to the connecting member. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Publication No. 8-40132 [Patent Document 2] Japanese Patent Publication No. 2022-39841 [Patent Document 3] Japanese Utility Model Application Publication No. 6-42868 Summary of the Invention [Problem to be solved by the invention]

[0012] However, in order to make the above-mentioned cable drum pawl applicable to several different types of cable drums, including small, medium, and large, multiple anti-rotation members of different lengths are provided at different intervals, and the intervals between the two outermost anti-rotation members that correspond to the largest cable drum among the targets are large, making the jig as a whole large and difficult to handle.

[0013] Until now, there has been no easy-to-use dedicated jig that can be temporarily used on the platform of a tailgate lifter to prevent a cable drum from running away, and that can be applied to multiple types of cable drums with different outer diameters.

[0014] In view of the above problems, the object of the present invention is to provide a cable drum runaway prevention jig that is easy to handle and can be easily installed on the platform of a tailgate lifter when loading and unloading cable drums, can effectively restrict the temporary rolling of the cable drum, and can be applied to multiple types of cable drums with different outer diameters without increasing the size of the overall structure. [Means for solving the problem]

[0015] In order to achieve the above object, the cable drum runaway prevention jig according to the invention described in claim 1 is, for example, as shown in Figs. 1 and 2, a cable drum runaway prevention jig to be attached to a cable drum having a cylindrical body portion and a pair of disk-shaped flange plates having an outer diameter larger than the body portion and attached concentrically to both ends of the body portion, a square-shaped stopper member that is disposed on a mounting surface of a platform of the tailgate lifter so as to be fitted between the mounting surface below the pair of flange plates of the cable drum and the mounting surface, and that restricts the rolling of the pair of flange plates; a support member erected from one end of the stop member and aligned along the outer surface of one of the flanges; a tubular member attached to the support member so as to extend in a direction perpendicular to the support member and inserted into a shaft hole formed in the center of one of the flange plates; a locking device that is hooked to an upper end of the one flange plate at the tip end side of the support member and releasably clamps and fixes the one flange plate and the support member, The tubular member is slidable along the support member and releasably fixed at any position, and the locking device is slidable along the support member in the released state.

[0016] According to the cable drum escape prevention jig of claim 1 of the present invention, first, a square-shaped stop member is fitted between a pair of flange plates and between the mounting surface and both undersides of the flange plates near the contact points with the mounting surface, with respect to the cable drum placed on the mounting surface of the platform, and a tubular member is inserted into the axial hole of one of the flange plates so that the support member is aligned with the outer surface of the flange plate, thereby positioning the support member on the diameter of the flange plate.

[0017] In this case, since the tubular member is slidably and releasably fixed to the support member, it can be slid along the support member to adjust its position so that it is at the center of the flange depending on the size of the cable drum. When the tubular member is fixed to the support member at a position where it is inserted into the shaft hole, the diametric position of the support member relative to the flange is also fixed.

[0018] The cable drum is then prevented from rolling off the platform by sliding the locking device at the tip of the support member in an unlocked state to engage the upper end of the flange plate on the diameter, and clamping and fixing this upper end together with the support member, so that the cable drum runaway prevention jig of the present invention is attached and fixed to both the upper and lower ends of one of the flange plates on the same diameter, almost completely restricting the rolling of the flange plate on the mounting surface. As the rolling of one flange plate is restricted in this way, the rolling of the other flange plate is also restricted at the same time, preventing the cable drum from rolling off the platform and running away.

[0019] As described above, according to the cable drum escape prevention jig of the present invention, the position of the tubular member can be adjusted by sliding it along the support member even for cable drums of different sizes, i.e., for flange plates of different diameters, so only one tubular member needs to be inserted into the axial hole.

[0020] Similarly, the position of the locking device can be adjusted in the direction facing the stopper member on the same diameter, so that the same locking device can be hooked to the upper end of flange plates of different diameters, ensuring a good locking state at all times.

[0021] Therefore, the cable drum escape prevention jig of the present invention avoids the need to provide multiple components of each jig in order to accommodate cable drums of different sizes, and the resulting increase in size of the jig.Although it has a simple and easy-to-handle configuration with only one retaining member, tubular member, and locking device, it can be applied to prevent escape of multiple types of cable drums of different sizes.

[0022] Furthermore, since the square-shaped stopper member is used to simultaneously restrict the rotation of the pair of flanges, it is made longer than the outer width of the cable drum within the expected target size range, i.e., the distance between the outer surfaces of the pair of flanges. Furthermore, if the thickness of the stopper member is too small compared to the outer diameter of the flanges of the cable drum, there is a risk that the flanges will roll and ride up during installation of the jig, so the stopper member must have a certain thickness.

[0023] For example, among the commercially available large cable drums used for electric wires in overhead line construction, those made of plastic that are within a size range that can be loaded and unloaded by a person using a tailgate lifter, those with a flange outer diameter of 760 mm to 1150 mm, an outer width of 420 mm to 640 mm, a flange thickness of 46 mm to 56 mm, and a shaft hole diameter of 50 mm to 75 mm are commonly used.

[0024] Therefore, it is preferable to set the stopper member to a length of approximately 750 mm and a thickness of 40 to 50 mm, for example, so that it is difficult for the flange plate of the maximum diameter in this range to climb over it and to effectively restrict rolling. Furthermore, the support member should be longer than the maximum of the target outer diameter range. For example, in the above standard range, if it is assumed that the maximum flange diameter is 1150 mm, it is preferable to set the length to 1250 to 1300 mm.

[0025] Furthermore, since the tubular member of the present invention only needs to be able to be hooked into the axial hole of one of the flange plates, it only needs to have an outer diameter smaller than the axial hole, and its length can be, for example, slightly longer than the thickness of the flange plate. For example, assuming a cable drum within the above-mentioned standard range, the tubular member's outer diameter can be 40 mm, and its length can be approximately 100 mm or more. Such a tubular member can be much shorter than the retaining member, making it easy to insert and remove from the axial hole of the flange plate and without affecting the overall size of the jig.

[0026] The cable drum runaway prevention jig according to the invention described in claim 2 is characterized in that the support members are rotatable and foldable relative to the stop members, for example, as shown in Fig. 8. They are capable of being folded when rotated toward each other, and being deployed for use when rotated away from each other.

[0027] According to the cable drum runaway prevention jig of claim 2 of the present invention, the jig can be folded by rotating the support member in a direction toward the stop member, and can be deployed for use by rotating the support member in a direction away from the stop member. In the folded state, the space occupied by the jig is smaller than in the deployed state when in use, making it easier to store and transport when not in use.

[0028] For example, it can be used when the platform is raised and lowered to load the cable drum onto the loading platform, and once the loading is complete, it can be folded and stored in a corner of the loading platform, allowing it to be easily transported to the destination together with the cable drum. Once at the destination, it can be unfolded again and immediately used, making it easy to use when raising and lowering the platform to unload the cable drum from the loading platform.

[0029] The support member and the locking member are connected at their ends rotatably by a rotating bolt, rotating pin, etc. via a connecting fitting, but if these ends are directly connected, when the support member is rotated closer to the locking member, the tubular member erected perpendicular to the support member intervenes between them and prevents them from coming closer together. Therefore, the folded state of the support member and the locking member is V-shaped, and the distance between their tips is wider than the length of the tubular member.

[0030] Therefore, as shown in Figure 8, by making the ends of the support member and the stop member rotatable via an L-shaped connecting fitting and making the rising length of the L-shaped connecting member approximately the length of the tubular member, the support member can be folded to a parallel position relative to the stop member with a gap equal to the length of the tubular member.

[0031] Therefore, in this case, the maximum width is narrower than in the V-shaped folded state, resulting in a smaller folded state, which further reduces the space occupied during storage and transportation, making handling easier.

[0032] In the cable drum runaway prevention jig according to the invention described in claim 3, for example, as shown in Figs. 1, 2 and 3, the support member has a square rail shape, the tubular member is provided to protrude from an attachment portion that is slidably attached along the support member so as to extend in a direction perpendicular to the support member, The mounting portion is connected to an engaging member that is slidably engaged with the rail groove of the support member from the inside via a screw member, and is fixed to the support member by clamping both edges of the rail groove between the engaging member and the screw member by tightening the screw member.

[0033] According to the cable drum escape prevention jig of claim 3 of the present invention, by making the support member a square rail shape and providing a tubular member protruding from an attachment section connected to an engaging member that can slide in a hooked state inside the rail groove, a configuration can be easily realized in which the tubular member can slide relative to the support member and its position can be adjusted.

[0034] The square rail shape is a type of general rail shape, and has a square outline based on a rail cross section that is U-shaped.

[0035] Therefore, as a support member, the open side of the cross section (approximately U-shaped) becomes the rail groove, and the closed back side is connected to the retaining member in a direction that is flush with the outer surface of one of the flange plates.

[0036] More specifically, in this case, the mounting portion can be constructed of a square tubular member through which the support member is inserted, and the inner surface of the outer wall of this square tubular member abuts against the rail groove and the outer walls of both edges thereof.

[0037] Therefore, both edges of the rail groove are sandwiched between the outer wall of the square tubular member and the engaging member located inside the rail groove, and by tightening the outer wall and the engaging member with a screw member, the mounting portion consisting of this square tubular member is fixed to the support member.

[0038] In the above rail configuration, the tubular member is fixed to the support member via the mounting portion by clamping both edges of the rail groove between the engaging member and the mounting portion and then fastening them together with screw members.

[0039] Therefore, simply by loosening the screw member, the engaging member and the mounting portion, together with the tubular member, can be made slidable again relative to the support member.

[0040] Furthermore, in the above configuration, when the screw member is loosened, the mounting portion can be slid further and removed from the tip of the support member, and can also be attached.

[0041] The tubular member may have any diameter that can be inserted into the axial hole of the corresponding flange plate, but to avoid the risk of the tubular member being too small for the axial hole of a relatively large cable drum and easily coming loose, it is desirable to use a mounting part that has a tubular member with a relatively large diameter that can accommodate a large axial hole.

[0042] On the other hand, it is conceivable that a tubular member having a relatively large diameter will have a larger diameter than the smaller axial hole of a relatively small cable drum.

[0043] Therefore, if the mounting part is replaceable, multiple types of mounting parts with different diameters of tubular members can be prepared, and the appropriate tubular member can be selected according to the axial hole of the cable drum and attached to the support member, so that the tubular member can always be properly attached to the axial hole of any diameter.

[0044] In the cable drum escape prevention jig according to the invention described in claim 4, for example, as shown in Figs. 2, 4 and 5, the locking device is a substantially U-shaped clamping member fitted to the upper end of one of the flanges and having a pair of front and rear outer arm portions extending downward from the outer surface of the flange and an inner plate portion extending downward from the inner surface of the flange; a rectangular tube member through which the support member is inserted so as to be relatively slidable on the outer surface side of the one flange plate; a substantially U-shaped lever portion that rotates the clamping member to switch between a clamping lock state with respect to the upper end portion of one of the flange plates and a release state of the clamping lock state, the lever portion has both ends rotatably attached to both side surfaces of the square tube member via a substantially triangular eccentric cam member, and the eccentric cam member rotates together with the both ends of the lever portion and has a rotation angle at which it engages with the outer arm portion, The clamping member has a lower end portion of the outer arm portion rotatably connected to a lower portion of the square tube member, and the outer arm portion is displaced between a close position and a separate position with respect to the square tube member by a change in a rotation angle of the eccentric cam member accompanying the rotation of the lever portion, The separated position of the outer arm portion relative to the square tube member is the tightening lock state in which the inner plate portion urges the upper end of one of the flange plates in a direction relatively pressing it against the square tube member, and the approaching position is a state in which the tightening lock state is released.

[0045] The locking device of the present invention can be widely adopted as long as it is slidable relative to the support member, is hooked onto the upper end of one of the flange plates, and has a mechanism that can releasably clamp and fix this upper end to the support member.

[0046] However, it is desirable that the transition from the unlocked state to the locked state be as quick and easy as possible. For example, it is preferable that the locked state be achieved with a single action of pushing up or down the lever portion described in claim 3.

[0047] According to the cable drum runaway prevention jig of claim 4 of the present invention, the locking device is slidable along the support member by the square tube member through which the support member is inserted.

[0048] Therefore, the locking device can be positioned near the tip of the support member and above and away from the pair of flange plates, and this positioning is used as the initial state when the jig is started to be attached to the cable drum.

[0049] Furthermore, by positioning the stopper member on the platform so that it fits between the underside of the pair of flange plates and the support surface, and aligning the support member with the outer surface of one of the flange plates and inserting the tubular member into the axial hole of that flange plate, the support member is positioned on the diameter of that flange plate, and then sliding the locking device in the released state downward along the support member via the square tube member, the approximately U-shaped clamping member of the locking device can be fitted over the upper end of the diameter of the flange plate.

[0050] Once the locking device has been slid and its clamping member fitted onto the upper end of the flange, simply by rotating the lever, the support member is clamped and fixed to the upper end of the flange via the square tubular member of the clamping member which is rotated accordingly, thereby completing the installation of the cable drum runaway prevention jig of the present invention on the cable drum. Once this installation is complete, the flange is locked between the stopper member and the locking device, preventing it from rolling.

[0051] The locking device is switched between locked and unlocked states by rotating the lever portion, as the rotation angle of the approximately triangular eccentric cam member interposed between the square tube member and both ends of the lever portion rotatably connected to the bottom of it changes with the rotation of the lever portion.

[0052] That is, the eccentric cam member engages with a pair of outer arms of the clamping member, and when the lever portion rotates to the locked state, the eccentric cam member rotates to an angle where the corner furthest from the center of rotation engages with the outer arms and pushes them away from the rectangular tube member. This causes the inner plate portion of the clamping member to press the upper end of the flange plate against the rectangular tube member, creating a clamping and fixed state. At this time, the lever portion rotates with the center of rotation as the fulcrum, and as a result, the inner plate portion of the clamping member, which is the point of application, exerts a large pressing force.

[0053] Then, as the lever portion is rotated in the opposite direction to the released state, the eccentric cam member is also rotated, the corner that was pushing the outer arm portion is released from its engagement with the outer arm portion, and the outer arm portion is released from the pressing force that was causing it to move away from the square tube member, and the clamping fixation caused by the inner plate portion of the clamping member pressing against the upper end of the flange plate is also released.

[0054] As described above, the locking device can be locked by simply rotating the lever portion in one direction to change the rotation angle of the eccentric cam member, and can be released by simply rotating the lever portion in the opposite direction, so the locking device can be easily switched in a short amount of time with a single action of pushing down or up the lever portion.

[0055] Furthermore, in the clamping member, when the pair of outer arm portions and the inner plate portion are formed integrally, the inner distance between them is fixed, and this also fixes the width dimension of the clamping space into which the upper end of the flange plate is fitted. For this reason, the width dimension should be set to be slightly larger than the thickness of the upper end of the flange plate, so that when the clamping member is initially fitted onto the upper end in the released state, there is a slight loose fit.

[0056] Furthermore, in the above configuration, since the locking device can slide relative to the support member inserted into the square tube member when in the released state, the support member has a square rail shape that continues to the tip surface, and as long as a separate stopper or the like is not provided, the support member can be relatively pulled out from the square tube member and removed, or attached.

[0057] In this case, since the locking device is replaceable with respect to the support member, even if a partial malfunction occurs with long-term use of the locking device or if it is damaged for some reason, it can be easily replaced with a new locking device.

[0058] In addition, multiple types of locking devices are provided as selectable and interchangeable locking devices, each equipped with a clamping member with a different width dimension for the clamping space into which the upper end of the flange plate fits, so that the most appropriate locking device can be selected and attached to the support member depending on the thickness of the flange plate of the target cable drum. This allows the cable drum runaway prevention jig to accommodate a wider range of flange plate thicknesses, i.e., a wider range of cable drum sizes.

[0059] Similarly, with respect to the tubular member, the attachment portion that can slide along the support member when the screw member is loosened can be removed from and attached to the tip side of the support member, and is replaceable.

[0060] Therefore, by preparing a plurality of attachment parts with tubular members of different diameters and lengths, it is possible to attach an attachment part with a tubular member of a diameter suitable for hooking into the shaft hole of the target flange to the support member, thereby avoiding the risk of the tubular member being too short or too small for the flange thickness or shaft hole diameter of a relatively large cable drum, for example, and becoming easily pulled out.

[0061] The cable drum runaway prevention jig according to the invention described in claim 5 is characterized in that, as shown in, for example, Figures 6 and 7, the outer arm portion and the inner plate portion of the clamping member are separate from each other and are connected to each other via a spring member in the upper surface area of ​​the clamping member.

[0062] According to the cable drum escape prevention jig of claim 5 of the present invention, the locking device has a pair of outer arm portions and inner plate portions that clamp and fix the upper end of the flange plate and the support member, and because these are separate bodies, they can be displaced away from each other against the biasing force of the spring member.

[0063] Therefore, the range of flange thicknesses that can be clamped and fixed by the same locking device is wider, i.e., the range of applicable cable drum sizes is wider than in the case of a locking device in which the width dimension of the clamping space of the clamping members is fixed.

[0064] In this case, if the width dimension of the clamping space in which the upper end of the flange is fitted between the pair of outer arm portions and the inner plate portion is set to be slightly smaller than the thickness of the main flange that is expected to be the target when the spring member is in its natural state, the clamping state of the upper end can be achieved by tightening with the spring force of the spring member even when the locking device is in the released state.

[0065] This allows the position of the locking device to be maintained after the clamping member is fitted into the upper end portion until the transition to the locked state is completed without the need for manual pressure, making the locking operation easier. [Effects of the Invention]

[0066] As described above, the cable drum escape prevention jig of the present invention places a square-shaped stopper member between a pair of flanges and the cable drum resting on the platform mounting surface, and inserts a tubular member into the axial hole of one of the flanges while aligning the support member along the outer surface of the flange, thereby positioning the support member on the diameter of the flange. After that, the locking device on the tip end of the support member is engaged with the upper end of the flange to lock the support member. This simple procedure completes the fastening of the jig to the cable drum while reliably restricting the rolling of the cable drum. Therefore, despite its simple configuration, it has the effect of reliably preventing the cable drum from escapeing from the platform in a short period of time.

[0067] Furthermore, the tubular member and locking device of the present invention are slidable relative to the support member and their positions are adjustable, so that the structure is simple and easy to handle, with one stop member, one tubular member, and one locking device, and has the advantage of being applicable to preventing runaway of multiple types of cable drums of different sizes without increasing the size of the jig. [Brief explanation of the drawings]

[0068] [Figure 1] 1 is an overall perspective view showing the schematic configuration of a cable drum runaway prevention jig according to an embodiment of the present invention. [Figure 2] 2A to 2E are perspective views illustrating the procedure for attaching the cable drum runaway prevention jig shown in FIG. 1 to the cable drum, with (a) to (e) being state diagrams sequentially illustrating the attachment process. [Figure 3] 2A and 2B are partial views showing the configuration of the tubular member of the cable drum runaway prevention jig shown in FIG. 1 when it is inserted into the axial hole of the flange plate, where (a) is a transparent perspective view and (b) is a cross-sectional view in the direction of the arrows at the AA and BB portions in (a). [Figure 4] 2A and 2B are schematic diagrams showing the configuration of a locking device of the cable drum runaway prevention jig shown in FIG. 1, where (a) is a perspective view and (b) is an exploded view showing the components of the locking device. [Figure 5]5A and 5B are explanatory views showing the operation mechanism of the locking device shown in Fig. 4 in each step, where (a) is a side view in the released state, (b) is a side view in the neutral state, and (c) is a side view in the locked state. [Figure 6] 5 is a perspective view showing the configuration of a modified example of the locking device shown in FIG. 4. FIG. [Figure 7] 7A and 7B are explanatory views showing the operation mechanism of the locking device shown in Fig. 6 in each step, where (a) is a side view in the released state, (b) is a side view in the neutral state, and (c) is a side view in the locked state. [Figure 8] 1. FIG. 4 is a perspective view showing a modified example of the cable drum escape prevention jig shown in FIG. 1, in which the jig has a foldable configuration, (a) being a diagram showing the folded state, and (b) being a diagram showing the unfolded state. [Figure 9] FIG. 1 is a schematic perspective view showing an example of a stopper provided on a platform of a conventional tailgate lifter. DETAILED DESCRIPTION OF THE INVENTION

[0069] An embodiment of the present invention will be described below with reference to the drawings.

[0070] <Embodiment> 1 to 5 show an embodiment of a cable drum runaway prevention jig according to the present invention.

[0071] As shown in Figures 1 and 2, the cable drum escape prevention jig 1 in this embodiment has a basic structure consisting of a square-shaped stop member 2 that is arranged on the support surface 201 of the platform 200 of the tailgate lifter so as to be fitted between the pair of flange plates (102A, 102B) of the cable drum 100 below the support surface 201, thereby restricting the rolling of the pair of flange plates (102A, 102B), and a support member 3 that stands upright from one end of the stop member 2 and is aligned with the outer surface of one of the flange plates 102A.

[0072] Furthermore, the support member 3 is equipped with a tubular member 5 that is attached to extend perpendicular to the support member and is inserted into an axial hole 103 formed in the center of one of the flange plates 102A, and a locking device 10 that is hooked to the upper end of one of the flange plates 102A at the tip side of the support member 3 and releasably clamps and fixes one of the flange plates 102A and the support member 3.

[0073] In this embodiment, the target is a cable drum 100 having a standard range of flange plate (102A, 102B) outer diameter D of 760 mm to 1150 mm, outer width 420 mm to 640 mm, flange plate thickness 46 mm to 56 mm, and shaft hole diameter 50 mm to 75 mm.The retaining member 2 has a length of 750 mm and a thickness of 45 mm, and the length of the support member 3 is approximately 1300 mm.

[0074] In this embodiment, the support member 3 has a square rail shape, and the tubular member 5 slides along the rail groove 4. Specifically, as shown in Fig. 3, the support member 3 has a square cross section (approximately U-shaped) with the open side serving as the rail groove 4, and therefore is connected to the stop member 2 with the closed back side aligned with the outer surface of one of the flange plates 102A as shown in Figs.

[0075] 3, the tubular member 5 is integrally provided to protrude from the inner wall 6B of the mounting portion 6, which is made of a square tubular member through which the support member 3 is inserted, and this mounting portion 6 slides along the support member 3. The outer wall 6A of the mounting portion 6 is connected to an engaging member 7, which is slidable in a hooked state inside the rail groove 4, by a screw member 8.

[0076] Since both side edge portions R of the rail groove 4 are sandwiched between the outer wall 6A and the engaging member 7, by tightening the screw member 8, the both side edge portions R are sandwiched between the outer wall 6A and the engaging member 7, and the mounting portion 6 is fixed to the support member 3.

[0077] At this time, the tubular member 5 is positioned and fixed on the tributary member 3. Conversely, by loosening the screw member 8, the mounting part 6 becomes slidable along the support member 3 together with the tubular member 5. Therefore, the tubular member 5 can be moved and fixed to any position relative to the support member 3, and its position can be easily adjusted.

[0078] Furthermore, with the screw member 8 loosened, the mounting part 6 can be slid further and removed from or attached to the tip of the support member 3. Therefore, mounting parts 6 with different diameters of the tubular member 5 can be replaced with other mounting parts 6.

[0079] In this embodiment, for example, by attaching the mounting portion 6 from which the tubular member 5 having a diameter of 60 mm and a length of 150 mm protrudes to the support member 3, it is possible to create a cable drum escape prevention jig 1 suitable for a large cable drum having a flange diameter of 1150 mm, an outer width of 630 mm, a flange plate thickness of 56 mm, and a shaft hole diameter of 75 mm.

[0080] 4, the locking device 10 in this embodiment is basically composed of a roughly U-shaped clamping member 11 that is fitted onto the upper end of one of the flange plates 102A, and a square tube member 15 that is rotatably connected to the clamping member 11. The support member 3 is inserted into the square tube member 15 on the outer surface side of the flange plate 102A, and the square tube member 15 is slidable relative to the support member 3.

[0081] The clamping member 11 has a pair of outer arm portions (12a, 12b) at the front and rear that extend downward on the outer surface side of the flange plate 102A when fitted onto the upper end of the flange plate 102A, and an inner plate portion 13 that extends downward on the inner surface side of the flange plate 102A.

[0082] In this embodiment, a roughly U-shaped lever portion 14 is rotatably attached to both sides of the square tube member 15 by a rotating bolt, a rotating pin, or the like via a roughly triangular eccentric cam member 16 at each end. The rotation of the lever portion 14 causes the clamping member 11 to rotate, thereby switching between a clamping-locked state and a clamping-locked release state for the upper end of one of the flange plates 102A.

[0083] That is, as shown in FIG. 5, the eccentric cam members 16 rotate together with both ends of the lever portion 14 and have a rotation angle that engages with the recesses E of the outer arm portions (12a, 12b).

[0084] The lower ends (12ae, 12be) of the outer arms (12a, 12b) are rotatably connected to the lower part of the square tube member 15 by a rotating bolt, a rotating pin, or the like, and the outer arms (12a, 12b) are displaced relative to the square tube member 15 between the close position shown in Figure 5(a) and the separated position shown in Figure 5(c) as the rotation angle of the eccentric cam member 16 changes with the rotation of the lever portion 14.

[0085] The position (Figure 5(c)) of the outer arm portions (12a, 12b) away from the square tube member 15 is a tightening / locking state in which the inner plate portion 13 urges the upper end of one of the flange plates 102A in a direction relatively pressing it against the square tube member 15, and the close position (Figure 5(a)) is a state in which the tightening / locking state is released.

[0086] In this embodiment, by rotating the lever portion 14 downward, the eccentric cam member 16 is rotated to an angle such that the angle furthest from the center of rotation becomes the engagement angle Cc and engages with the recess E of the outer arm portion (12a, 12b) to push the outer arm portion (12a, 12b) away from the square tube member 15.

[0087] This results in a clamped and fixed state (FIG. 5(a)) in which the inner plate portion 13 of the clamping member 11 presses the upper end of the flange plate 102A against the square tube member 15. As a result, a clamped and locked state is obtained for the support member 3 inserted through the square tube member 15 via the clamped and fixed square tube member 15.

[0088] The specific shapes of the recess E and the engagement angle Cc can be various as long as they can engage with each other without slipping when engaged, but in this embodiment, the eccentric cam member 16 has a thick rounded triangular shape as its basic shape, with the engagement angle Cc having a chamfered flat portion. Meanwhile, the recess E has an inverted trapezoidal shape that receives the flat portion of the engagement angle Cc at its bottom. In this case, the flat portion of the engagement angle Cc engages well within the inverted trapezoidal recess E, making it less likely for the engagement angle Cc to slip off when engaged.

[0089] Furthermore, by rotating the lever portion 14 in the opposite direction upward, the eccentric cam member 16 is also rotated, and the engagement angle Cc that had been pushing out the outer arm portions (12a, 12b) is released from the engagement state with the recesses E of the outer arm portions.

[0090] Therefore, the outer arm portions (12a, 12b) are released from the pressing force that had been separating them from the square tube member 15, and the clamping fixation caused by the inner plate portion 13 of the clamping member 11 pressing against the square tube member 15 at the upper end of the flange plate 102A is also released. As a result, the clamping lock state with respect to the support member via the square tube member 15 is released.

[0091] In the locking device 10 of this embodiment, the upper end of the flange plate 102A is clamped between the square tube member 15 of the clamping member 11 and the inner plate portion 13, so the width W of this clamping space can be set to a dimension slightly larger than the thickness of the flange plate 102A of the target cable drum 100.

[0092] Furthermore, in this embodiment, the square tubular member 15 has a gripping piece G protruding from its surface. This is used when the flange 102A of the cable drum 100 has a rim portion formed on its edge that protrudes slightly outward, and the upper edge of the square tubular member 15 gets caught on a step in the rim portion, causing problems with installing the locking device 10. In other words, when a snag occurs, the snag can be resolved by grasping and pulling or shaking this gripping piece G.

[0093] The runaway prevention state achieved by attaching the cable drum runaway prevention jig 1 according to this embodiment having the above-described configuration to the cable drum 100 is achieved by the following procedure.

[0094] First, as an initial state, as shown in Figure 2(a), with the screw member 8 loosened, the mounting member 6 is slid along the support member 3, and the screw member 8 is lightly tightened to secure the tubular member 5 at a height position corresponding to the radius of the target cable drum 100, and the locking device 10 is moved to the tip of the support member 3.

[0095] In this initial state, as shown in Fig. 2(b), the cable drum 100 is placed on the support surface 201 of the platform 200, and the retaining members 2 are placed between the lower surfaces of the pair of flange plates (102A, 102B) and the support surface 201, and the support member 3 is aligned with the outer surface of one of the flange plates 102A, and the tubular member 6 is inserted into the axial hole 103 of the flange plate 102A. By inserting the tubular member 6 into the axial hole 103, the support member 3 is positioned along the diameter direction of the flange plate (102A).

[0096] Next, as shown in Figure 2(c), the insertion state of the tubular member 6 into the axial hole 103 is checked, and if necessary, fine position adjustments are made, and then the screw member 8 is tightened to fix the position of the mounting portion 6 to the support member 3.

[0097] Then, as shown in FIG. 2(d), the locking device 10 in the released state with the lever portion 14 raised upward is lowered from the tip along the support member 3, and the approximately U-shaped clamping member 11 is fitted into the upper end of the flange plate 102A.

[0098] Finally, as shown in Figure 2(e), when the lever portion 14 of the locking device 10 is lowered, the eccentric cam member 16 is rotated, and the clamping member 11 is also rotated in a direction that pushes the outer arm portions (12a, 12b) outward relative to the square tube member 15.

[0099] This clamps and fixes the square tube member 15 to the upper end of the flange plate 102A, and a tightened and locked state is obtained between the support member 3 inserted into the square tube member 15 and the upper end of the flange plate 102A, completing the attachment of the cable drum escape prevention jig 1 to the cable drum 100.

[0100] The cable door ram 100 has one flange plate 102A fixed between the lower stop member 2 and the locking device 10 at the upper end thereof, which is diametrically opposed to the lower flange plate 102A, thereby restricting its rolling. This eliminates the risk of the cable drum 100 escaping from the platform 200, allowing the cable drum 100 to be raised and lowered safely.

[0101] Furthermore, after the predetermined lifting and lowering has been completed, the lock can be released simply by rotating the lever portion 14 of the locking device 10 upward, and the cable drum escape prevention jig 1 can be easily removed from the cable drum 100 by simply moving the stopper member 2 while pulling the tubular member 6 out of the shaft hole 103. The cable drum 100 then becomes rollable, and can be moved by rolling it to the desired location.

[0102] In the locking device 10 according to the above embodiment, the width W of the clamping space into which the upper end of the flange plate 102A of the clamping member 11 is fitted is fixed, so that the thickness of the flange plate that can be accommodated is limited to some extent.

[0103] Therefore, as shown in Figure 6, if the pair of outer arms (22a, 22b) and the inner plate portion 23 of the clamping member 21 are separate from each other and are connected to each other via a spring member 27 in the upper surface area of ​​the clamping member 21, the distance between the outer arms (22a, 22b) and the inner plate portion 23 can be changed by the elastic displacement of the spring member 27.

[0104] In this case, the same locking mechanism as in the above-described embodiment is sufficient except for the connecting structure using the spring member 27. That is, in the clamping member 21 of the locking device 20, the lower ends (22ae, 22be) of the outer arm portions (22a, 22b) are rotatably connected to the lower part of the square tube member 25 through which the support member 3 is slidably inserted, and a substantially U-shaped lever portion 24 is rotatably attached to both side surfaces of the square tube member 25 via a substantially triangular eccentric cam member 26 at each end thereof.

[0105] 7, the eccentric cam members 26 rotate together with both ends of the lever portion 24, and have a rotation angle that engages with the recesses E of the outer arm portions (22a, 22b). Here, as in the previous embodiment, the eccentric cam members 26 are basically thick and have a rounded triangular shape with chamfered flat portions at the engaging corners, and the recesses E are in the shape of an inverted trapezoid that receives the flat portions of the engaging corners at their bottoms.

[0106] Therefore, the change in the rotation angle of the eccentric cam member 16 accompanying the rotation of the lever portion 24 causes the outer arm portions (22a, 22b) to be displaced between the close position shown in Fig. 7(a) and the separated position shown in Fig. 5(c) relative to the square tube member 25. The separated position (Fig. 7(c)) of the outer arm portions (22a, 22b) relative to the square tube member 25 is a tightening / locking state in which the inner plate portion 23 urges the upper end of one of the flange plates 102A in a direction relatively pressing it against the square tube member 25, and the close position (Fig. 7(a)) is a state in which the tightening / locking state is released.

[0107] In the above configuration, the width W' of the clamping space of the clamping member 21 can also be changed, so that the locking device 20 incorporating such a spring member can accommodate a wider range of flange thicknesses, allowing one locking device 20 to be used with a wider variety of cable drum sizes.

[0108] Furthermore, if the width W' of the clamping space in the natural state of the spring member 27 is smaller than the thickness of the target flange, when the upper end of the flange 102A stretches the spring member 27 and fits into the clamping space, the upper end of the flange 102A is clamped by the biasing force of the spring member 27. This clamping keeps the upper end of the flange 102A from shifting from a predetermined position even in the released state, as shown in FIG. 7(a), so that the lever 24 can be rotated downward without being pressed by hand to complete the transition to the locked state shown in FIG. 7(c). This makes the locking operation itself easier.

[0109] 8, a foldable type can be formed by making the support member 3 rotatable relative to the stopper member 2. Here, the support member 3 and the stopper member 2 are rotatably connected via an L-shaped connecting member 9, and the height h of the rising part of the L-shaped connecting member 9 is set to approximately the length of the tubular member 5.

[0110] With the above configuration, by rotating the support member 3 in a direction approaching the stop member 2, the support member 3 can be folded to a state parallel to the stop member 2, as shown in Figure 8(a). In this folded state, the distance L between the support member 3 and the stop member 2 can be kept constant all the way to the tip of both members, a distance approximately equal to the height h of the rising part of the connecting member 9, which corresponds to the length of the tubular member 5. This is the state in which the cable drum runaway prevention jig can be most efficiently housed in the smallest occupying space.

[0111] From this folded state, as shown in FIG. 8(b), the support member 3 can be simply rotated in a direction away from the stopper member 2 to transition to the unfolded state, which is the state in which it is used.

[0112] Therefore, when the cable drum 100 is attached to the unfolded state for use, and then folded after the cable drum 100 has been loaded onto the loading platform, it can be easily stored and transported. When the cable drum 100 is unloaded from the loading platform at the transport site, it can be unfolded again for immediate use. [Industrial Applicability]

[0113] The cable drum runaway prevention jig of the present invention regulates the rolling of a cable drum that is placed on the platform of a tailgate lifter and raised and lowered, but it is not limited to use on such lifting platforms and can be widely used as a stopper in a variety of situations, such as when it is necessary to temporarily stop a cable drum during rolling transport on the ground. [Explanation of symbols]

[0114] 1: Cable drum runaway prevention jig 2: Retaining member 3: Support member 4: Rail groove 5: Tubular member 6: Mounting part 7: Engagement member 8: Screw parts 9: Connecting fittings h: Height of connecting fitting D: Outer diameter of flange plate 10,20: Locking device 11,21: Holding member 12a, 12b, 22a, 22b: Outer arm 12ae, 12beb, 22ae, 22be: Lower end of outer arm 13,23:Inner plate part 14,24: Lever section R: Rail groove edge 15, 25: Square tube parts E: Recess 16, 26: Eccentric cam member Cc: Engagement angle 27: Spring material W, W': width of clamping space G: Grip piece 100: Cable drum 102A, 102B: Collar plate 103: Shaft hole 200,300:Platform 201, 301: Placement surface 310: Stopper

Claims

1. A cable drum runaway prevention jig to be attached to a cable drum having a cylindrical body portion and a pair of disk-shaped flanges having an outer diameter larger than the body portion and attached to both ends of the body on a concentric axis, a stopper member in the form of a square bar, which is disposed on a support surface of a platform of the tailgate lifter so as to be fitted between the support surface below the pair of flange plates of the cable drum and the support surface, and which restricts the rolling of the pair of flange plates; a support member erected from one end of the stop member and aligned along the outer surface of one of the flanges; a tubular member attached to the support member so as to extend in a direction perpendicular to the support member and inserted into a shaft hole formed in the center of one of the flange plates; a locking device that is hooked to an upper end of the one flange plate at the tip end side of the support member and releasably clamps and fixes the one flange plate and the support member, A cable drum escape prevention jig characterized in that the tubular member is slidable along the support member and is releasably fixed at any position, and the locking device is slidable along the support member in the released state.

2. The cable drum escape prevention jig according to claim 1, wherein the support member is rotatable and foldable relative to the stopper member.

3. The support member has a square rail shape, the tubular member is provided protruding from a mounting portion that is slidably attached along the support member, A cable drum escape prevention jig as described in claim 1 or 2, characterized in that the mounting portion is connected to an engaging member that is slidably engaged from the inside in the rail groove of the support member via a screw member, and by tightening the screw member, both edge portions of the rail groove are sandwiched between the mounting portion and the engaging member, thereby fixing the mounting portion to the support member.

4. The locking device is a substantially U-shaped clamping member fitted to the upper end of one of the flanges and having a pair of front and rear outer arm portions extending downward from the outer surface of the flange and an inner plate portion extending downward from the inner surface of the flange; a rectangular tube member through which the support member is inserted so as to be relatively slidable on the outer surface side of the one flange plate; a substantially U-shaped lever portion that rotates the clamping member to switch between a clamping lock state with respect to the upper end portion of one of the flange plates and a release state of the clamping lock state, the lever portion has both ends rotatably attached to both side surfaces of the square tube member via a substantially triangular eccentric cam member, and the eccentric cam member rotates together with the both ends of the lever portion and has a rotation angle at which it engages with the outer arm portion, The clamping member has a lower end portion of the outer arm portion rotatably connected to a lower portion of the square tube member, and the outer arm portion is displaced between a close position and a separate position with respect to the square tube member by a change in a rotation angle of the eccentric cam member accompanying the rotation of the lever portion, 4. The cable drum escape prevention jig of claim 3, wherein the separated position of the outer arm portion relative to the square tube member is the tightening / locking state in which the inner plate portion urges the upper end of one of the flange plates in a direction relatively pressing it against the square tube member, and the approaching position is a state in which the tightening / locking state is released.

5. A cable drum escape prevention jig as described in claim 4, characterized in that the outer arm portion and the inner plate portion of the clamping member are separate from each other and are connected to each other via a spring member in the upper surface area of ​​the clamping member.

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