Braking device for cable drum

Abstract

To provide a brake device for a cable drum which achieves high convenience in work for arranging the brake device below a flange part of a cable drum, can maintain a function for braking the cable drum for a relatively long time, and can be brought into a compact state when stored or carried.SOLUTION: The invention includes: a rubber strip; one side pillar which supports a part of one side of the rubber strip; the other side pillar which supports a part of the other side of the rubber strip; and a rubber strip tensile force application mechanism which can apply a tensile force to the rubber stip between one side support position and the other side support position. The rubber strip tensile force application mechanism brings up the rubber strip between the one side support position and the other side support position while gradually increasing a curvature radius of an arc state of the rubber strip in a side view. The one side pillar and the other side pillar are connected to the base member in a foldable manner. A rotation roller is provided at one side tip of the base member. The base member may be folded in two.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a braking device for a cable drum for braking the cable drum. [Background technology]

[0002] A cable drum generally has a cylindrical portion around which the cable is wound and flange portions (large diameter flange portions) provided on both the left and right ends of the cylindrical portion (having a shape similar to a spool of thread).

[0003] A rod is passed through the central hole of the cylindrical portion and the rod is rotatably supported, so that both the rod and the cable drum can be rotatably supported.

[0004] For example, the cable jack disclosed in Patent Document 1 by the present applicant comprises a main body having a cylindrical internal space that opens upward, a push-up rod whose lower side is housed in the internal space and moves up and down along the internal space, a head roller support part provided on the upper part of the push-up rod, a pair of head rollers journaled on the head roller support part, a protruding guard member that can be positioned in a guard area above the pair of head rollers and facing the pair of head rollers, and a locking mechanism that locks the protruding guard member in the guard area.

[0005] For example, if the cable drum rotates too much during cable extension work, the cable will bend, making it difficult to proceed with the work smoothly. It may also cause unwanted damage to the cable. This can be a problem related to the quality of the work and can even cause accidents.

[0006] On the other hand, cable drums are quite heavy, i.e., have a large inertia, so safety considerations are essential when braking a rotating cable drum.

[0007] Figure 16 is a photograph of a brake device (product name: "Cable Drum Auxiliary Brake") commercially available from Towa Supply Co., Ltd. The brake device shown in Figure 16 is arranged so as to pass under the flange of the cable drum from one side to the other in a horizontal direction perpendicular to the axial direction of the cable drum (from the front to the back in Figure 16), and is composed of multiple metal trays articulated together in an elongated shape in a plan view, as shown in Figure 16. A rubber plate (black rubber) for braking the flange is arranged on the bottom surface of each metal tray.

[0008] The front ends of the articulated metal trays are supported by a one-side support column via a dedicated one-side connecting piece at a position higher than the lower end of the flange. Symmetrically, the rear ends of the articulated metal trays are supported by a other-side support column via a dedicated other-side connecting piece and a tension chain at a position higher than the lower end of the flange. As a result, the articulated metal trays form a polygon with multiple sides (the number of sides is equal to the number of metal trays) that is close to a circular arc in side view.

[0009] The manual lever located at the innermost side can be rotated further toward the inner side, and in conjunction with this rotation, the tension chain pulls the inner ends of the articulated metal trays in a direction away from one of the support posts. At this time, the articulated metal trays are deformed to approach a straight line (approach an arc with a larger radius of curvature), i.e., the middle region is lifted upward. As a result, a rubber plate located on the bottom of one of the metal trays in the middle region comes into contact with the flange of the cable drum, and the frictional resistance between them brakes the cable drum (its flange).

[0010] The brake device shown in Figure 16 is very popular in the market as it provides sufficient braking performance. However, it has many parts and is heavy, which makes it somewhat difficult to carry around.

[0011] Furthermore, although the articulated metal trays can be deformed as a whole by utilizing the articulation, each metal tray (i.e., each rubber plate) does not deform in an arc along the flange. As a result, the contact between the rubber plate and the flange is always limited to a narrow area, which is prone to localized wear, and this wear progresses quickly. (However, the brake device shown in Figure 16 also has the advantage that if the wear of a rubber plate exceeds an allowable level, only that rubber plate (or the metal tray containing that rubber plate) needs to be replaced.)

[0012] Therefore, the inventor of the present invention developed a brake device for a cable drum that can maintain the function of braking the cable drum for a relatively long period of time, and obtained a patent for it (Patent Document 2).

[0013] The invention disclosed in Patent Document 2 includes a rubber strip that is elongated in a plan view and can be arranged so as to pass under a flange of a cable drum from one side to the other in a horizontal direction perpendicular to the axial direction of the cable drum; a one-side support pillar that supports a portion of one side of the rubber strip at a one-side support position that is higher than the lower end position of the flange; and an other-side support pillar that supports a portion of the other side of the rubber strip at an other-side support position that is higher than the lower end position of the flange; and a tension can be applied to the rubber strip between the one-side support position and the other-side support position. and a rubber strip tensioning mechanism that moves the other end of the rubber strip in a direction away from the other support position, thereby gradually increasing the radius of curvature of the arc-shaped form of the rubber strip in a side view between the one support position and the other support position, and lifts the rubber strip between the one support position and the other support position, and the rubber strip is made of a material containing synthetic rubber and cotton.

[0014] According to the invention disclosed in Patent Document 2, only a rubber strip is stretched from one support position to the other, resulting in a small number of parts and a sufficiently light weight. Furthermore, the rubber strip is raised while gradually increasing the radius of curvature of its arc-shaped form in side view, allowing it to abut against the flange in an arc-shaped form (although with a different radius of curvature) that conforms to the flange. This allows the rubber strip to abut against the flange over a longer (wider) area, reducing the degree of localized wear. This allows the cable drum's braking function to be maintained for a relatively long period without replacement of the rubber strip. (However, there is a disadvantage in that if the rubber strip needs to be replaced, the entire rubber strip must be replaced. However, according to the invention disclosed in Patent Document 2, the time until the rubber strip needs to be replaced (the product life of the rubber strip) is sufficiently long.)

[0015] The rubber strip of the invention disclosed in Patent Document 2 must be flexible enough to be able to deform into an arc shape that fits the flange when viewed from the side, and durable enough to generate sufficient frictional resistance when it comes into contact with the flange and withstand that frictional resistance. A rubber strip made of a material containing synthetic rubber and cotton can easily meet these requirements. [Prior art documents] [Patent documents]

[0016] [Patent Document 1] Patent Publication No. 2018-188293 [Patent Document 2] Patent No. 7231239 Summary of the Invention [Problem to be solved by the invention]

[0017] The cable drum brake device disclosed in Patent Document 2 is highly regarded at various construction sites and the like.

[0018] However, the inventors have discovered a way to significantly improve the convenience of the cable drum brake device.

[0019] Specifically, the inventors discovered that in a brake device in which one side support and the other side support are connected to a base member, by providing a rotating roller at the tip of one or the other side of the base member, the brake device can be moved while tilting it so that the rotating roller rolls on the ground, thereby significantly improving the convenience of placing the brake device below the flange of the cable drum (see Figures 6 and 7).

[0020] The inventors have also discovered that in such a brake device, if the base member can be folded in half with the underside facing inward, this will result in a compact configuration for storage or transport (see Figures 11 to 15), and further that in such a case, the presence of the rotating rollers as described above will make the folding and unfolding operations easier (see Figures 9 and 10).

[0021] Furthermore, the inventors have found that in such a case, if the one-side support column and the other-side support column can be folded relative to the base member, this will result in a more compact configuration when stored or carried, which is more preferable.

[0022] The present invention was devised based on the above findings. An object of the present invention is to provide a brake device for a cable drum that is highly convenient to place below the flange of the cable drum, can maintain its function of braking the cable drum for a relatively long period of time, and can be made compact when stored or carried. [Means for solving the problem]

[0023] The present invention relates to a rubber strip that is elongated in a plan view and can be arranged so as to pass under a flange of a cable drum from one side to the other in a horizontal direction perpendicular to the axial direction of the cable drum; a one-side support pillar that supports a portion of one side of the rubber strip at a one-side support position that is higher than the lower end position of the flange; an other-side support pillar that supports a portion of the other side of the rubber strip at an other-side support position that is higher than the lower end position of the flange; a rubber strip tensioning mechanism that can apply tension to the rubber strip between the one-side support position and the other-side support position; a base member to which the one-side support pillar and the other-side support pillar are connected on the upper surface side; and a rotating roller provided at the tip of one side or the other side, wherein the rubber strip tensioning mechanism moves the other side end of the rubber strip in a direction away from the other side support position, thereby gradually increasing the radius of curvature of the arc-shaped form of the rubber strip in a side view between the one side support position and the other side support position, and lifts the rubber strip between the one side support position and the other side support position, wherein the one side support pillar and the other side support pillar are foldable relative to the base member, and the base member is foldable in half with the lower surface side facing inward.

[0024] According to the present invention, the rubber strip is raised while gradually increasing the radius of curvature of the arc-shaped configuration in side view, so that it can contact the flange in an arc-shaped configuration that follows the flange (however, the radius of curvature is different). In other words, the contact between the rubber strip and the flange occurs over a longer (wider) area, reducing the degree of localized wear (see FIG. 8). This allows the rubber strip to maintain its function of braking the cable drum for a relatively long period of time without replacement.

[0025] Furthermore, according to the present invention, a rotating roller is provided at the tip of one or the other side of the base member, and by tilting and moving the brake device so that the rotating roller rolls on the ground, the convenience of placing the brake device below the flange of the cable drum is significantly improved (see Figures 6 and 7).

[0026] Furthermore, according to the present invention, the base member can be folded in half with the underside facing inward, resulting in a compact form for storage or carrying (see Figures 11 to 15), and furthermore, the presence of the aforementioned rotating rollers makes folding and unfolding operations easy (see Figures 9 and 10).

[0027] Furthermore, according to the present invention, the one-side support column and the other-side support column can be folded relative to the base member, so that the configuration becomes even more compact when stored or carried (see FIGS. 9 to 15).

[0028] In addition, in the present invention, it is preferable that the base member be foldable in half via a hinge portion, and that the base member be provided with an auxiliary handle near the hinge portion for folding and unfolding operations.

[0029] In this case, the presence of such an auxiliary handle makes the folding and unfolding operations even easier.

[0030] In addition, in the present invention, it is preferable that a main handle for carrying the brake device is provided on one of the left and right sides of the base member, and a spacer stand for placing the brake device is provided on the other of the left and right sides of the base member.

[0031] In this case, the presence of the main handle makes it easier to carry, and the presence of the spacer stand allows for stable, stationary storage.

[0032] Furthermore, similar to the invention of Patent Document 2, the rubber strip of the present invention must have sufficient flexibility to deform into an arc shape that fits the flange when viewed from the side, and sufficient durability to withstand the frictional resistance while generating sufficient frictional resistance when it comes into contact with the flange. A rubber strip made of a material containing synthetic rubber and cotton can easily meet these requirements. In particular, a rubber strip including a portion in which multiple layers of synthetic rubber (e.g., five layers each about 0.6 mm thick) and multiple layers of cotton (e.g., four layers each about 0.6 mm thick) are alternately laminated can achieve both high flexibility and high durability.

[0033] As with the invention of Patent Document 2, the overall thickness of the rubber strip is preferably within the range of 4 to 7 mm in order to achieve both high flexibility and high durability.

[0034] Furthermore, similar to the invention of Patent Document 2, it is preferable that the rubber strip tensioning mechanism has a pivoting moving part, a manual lever or a mounting part for mounting a manual lever provided on the pivoting moving part (it is also possible to sell a product that does not include the manual lever itself (to attach an appropriate pipe, etc. on site)), and a foot-operable pedal provided on the pivoting moving part.

[0035] In this case, it becomes possible to operate it with your feet as well as your hands, improving operability. Also, if the manual lever is attached at an acute angle (not parallel) to the rotating part, the direction of foot depression and the direction of hand lever operation can be made different. In other words, it is possible to design the direction of foot depression and the direction of hand lever operation independently.

[0036] Furthermore, similar to the invention of Patent Document 2, it is preferable that the rubber strip is provided with a pair of side guides rising from both side edges at an approximately midpoint between the one-side support position and the other-side support position.

[0037] This allows the pair of side guides to effectively prevent the rubber strip from coming off the flange during braking, making it possible to brake the flange more stably. It is sufficient for the pair of side guides to be located approximately midway along the rubber strip between the one-side support position and the other-side support position. (It is not necessary to provide side guides on the sides of all of the rubber plates (all of the metal trays) as in the brake device of FIG. 16.) [Effects of the Invention]

[0038] According to the present invention, the rubber strip is raised while gradually increasing the radius of curvature of the arc-shaped configuration in side view, allowing it to contact the flange in an arc-shaped configuration (however, the radius of curvature is different) that conforms to the flange. This allows the rubber strip to contact the flange over a longer (wider) area, reducing the degree of localized wear (see FIG. 8). This allows the rubber strip to maintain its braking function for a relatively long period without replacement. Furthermore, according to the present invention, a rotating roller is provided at the tip of one or the other side of the base member. By tilting the brake device so that the rotating roller rolls on the ground, the brake device can be positioned below the flange of the cable drum with significantly improved ease (see FIGS. 6 and 7). Furthermore, according to the present invention, the base member can be folded in half with the underside facing inward, resulting in a compact configuration for storage or transport (see Figures 11 to 15), and the presence of the aforementioned rotating rollers also makes folding and unfolding easy (see Figures 9 and 10). Furthermore, according to the present invention, the one-side support column and the other-side support column can be folded relative to the base member, resulting in an even more compact configuration for storage or transport. [Brief explanation of the drawings]

[0039] [Figure 1] 1 is a side view of a brake device for a cable drum according to an embodiment of the present invention; [Figure 2] FIG. 2 is a plan view of the brake device of FIG. [Figure 3]FIG. 2 is a bottom view of the brake device of FIG. 1. [Figure 4] FIG. 2 is a photograph corresponding to a plan view of the brake device in FIG. 1. [Figure 5] FIG. 2 is a photograph corresponding to a perspective view of the brake device of FIG. 1. [Figure 6] 3 is a photograph showing the operation of placing the brake device of FIG. 1 below the flange of the cable drum. [Figure 7] 3 is a photograph showing the operation of placing the brake device of FIG. 1 below the flange of the cable drum. [Figure 8] 8A and 8B are explanatory diagrams showing how the rubber strip of the brake device of Fig. 1 comes into contact with the flange portion. Fig. 8A shows the state before coming into contact with the flange portion, and Fig. 8B shows the state after coming into contact with the flange portion. [Figure 9] 2 is a photograph showing the folding / unfolding operation of the brake device of FIG. 1. [Figure 10] 2 is a photograph showing the folding / unfolding operation of the brake device of FIG. 1. [Figure 11] FIG. 2 is a photograph corresponding to a plan view of the brake device in FIG. 1 in a folded state. [Figure 12] 2 is a photograph corresponding to a perspective view of the brake device in FIG. 1 in a folded state. [Figure 13] FIG. 2 is a photograph corresponding to a perspective view of the brake device of FIG. 1 in a carried state. [Figure 14] FIG. 2 is a photograph corresponding to a perspective view of the brake device in FIG. 1 in a stationary storage state. [Figure 15] FIG. 2 is a photograph corresponding to a perspective view of the brake device in FIG. 1 in a stationary storage state. [Figure 16] 1 is a photograph of a conventional brake device. DETAILED DESCRIPTION OF THE INVENTION

[0040] [composition] An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a side view of a brake device 1 for a cable drum according to an embodiment of the present invention, Fig. 2 is a plan view of the brake device 1 of Fig. 1, and Fig. 3 is a bottom view of the brake device 1 of Fig. 1. Fig. 4 is a photograph corresponding to the plan view of the brake device 1 of Fig. 1, and Fig. 5 is a photograph corresponding to a perspective view of the brake device 1 of Fig. 1.

[0041] 1 to 5, the brake device 1 of this embodiment includes an elongated rubber strip 10 in a plan view. The rubber strip 10 has a width of 12.5 cm, a length of 141 cm, and a thickness of 5.5 mm.

[0042] Specifically, the rubber strip 10 is made of five layers of synthetic rubber (each about 0.6 mm thick) and four layers of cotton (each about 0.6 mm thick) laminated alternately. In order to increase frictional resistance against the collar, the synthetic rubber layer exposed on the surface is knitted (the cotton layer underneath is visible).

[0043] 1 to 5, an end (part) on the left side (one side) of the rubber strip 10 is supported by the upper end of the one-side support pillar 20. Specifically, the left end of the rubber strip 10 is fixed by a rubber strip fixing part 21 rotatably attached to the upper end of the one-side support pillar 20.

[0044] The rubber strip fixing portion 21 has a pair of side pieces 22 each having a pivot hole, a bottom plate connecting the lower ends of the pair of side pieces 22, and an upper fixing plate 23 that sandwiches and fixes the rubber strip between the bottom plate and the side pieces 22.

[0045] A cylindrical pin 28 fixed to the upper end of one of the side supports 20 is inserted into the pivot hole of the side piece 22, thereby allowing the pair of side pieces 22 (i.e., the rubber strip fixing portion 21) to rotate around the cylindrical pin 28.

[0046] 1 to 5, a part of the rubber strip 10 on the right side (other side) is supported by the upper end of the other-side support 30. Specifically, the right side of the rubber strip 10 passes between a cylindrical pin 38 attached to the upper end of the other-side support 30 and a top plate 39 (this area corresponds to the other-side support position), and the right end of the rubber strip 10 is fixed by a rubber strip fixing part 31 rotatably attached to a rotating moving part 61 described later.

[0047] The rubber strip fixing portion 31 has the same configuration as the rubber strip fixing portion 21. That is, the rubber strip fixing portion 31 has a pair of side pieces 32 each having a rotation hole, a bottom plate connecting the lower ends of the pair of side pieces 32, and an upper fixing plate 33 that sandwiches and fixes the rubber strip between the bottom plate and the side pieces 32.

[0048] A cylindrical pin 48 fixed to the pivoting portion 61 is inserted into the pivot hole of the side piece 32, thereby allowing the pair of side pieces 32 (i.e., the rubber strip fixing portion 31) to pivot around the cylindrical pin 48.

[0049] In this embodiment, the lower end of the one-side support pillar 20 is rotatably (foldably) connected to the base member 50, and similarly, the lower end of the other-side support pillar 30 is also rotatably (foldably) connected to the base member 50 (see Figures 9 to 15).

[0050] The height from the bottom surface of the base member 50 to the top end of the one-side support column 20 is, for example, 18 cm. Similarly, the height from the bottom surface of the base member 50 to the top end of the other-side support column 30 is, for example, 18 cm. The length of the base member 50 is, for example, 160 cm, and the distance between the one-side support column 20 and the other-side support column 30 is approximately 120 cm.

[0051] The base member 50 is provided with fixing plates 51 at two locations, one on the left and one on the right in Figures 1 to 5, for fixing to the floor surface. Each fixing plate 51 is provided with two height adjustment screws 52 for fixing to the floor surface. Each fixing plate 51 is, for example, 26 cm long and 10 cm wide.

[0052] A pivotable moving part 61 is pivotally mounted on the right end of the base member 50 via a cylindrical pin 58. The right end (distal end) of the pivotable moving part 61 is configured as a pedal 61p that can be operated by foot. The pedal 61p measures approximately 20 cm in front-to-back direction (left-to-right direction in FIGS. 1 to 5) and approximately 14 cm in left-to-right direction (up-to-down direction in FIGS. 2 and 4). A mounting part 61m for mounting (inserting) a manual lever (for example, a single-pipe) is provided midway along the pivotable moving part 61.

[0053] In this embodiment, the direction of foot depression and the direction of hand lever operation are designed to be independent of each other.

[0054] By rotating the pivoting movement part 61 (by stepping on it with your foot or operating the lever with your hand), the right end of the rubber strip 10 moves in a direction away from the other-side support position (between the cylindrical pin 38 and the top plate 39). This makes it possible to apply tension to the rubber strip 10 between the left-side rubber strip fixing part 21 (corresponding to the one-side support position) and the other-side support position. In other words, the pivoting movement part 61 (with the pedal 61p and the mounting part 61m) constitutes a rubber strip tension applying mechanism.

[0055] In addition, the pivoting portion 61 has a built-in return spring (not shown), so that when the operation of the pedal 61p or the manual lever is released, the pivoting portion 61 returns to its original position (the position shown in Figures 1 to 5).

[0056] The rubber strip 10 is also provided with a pair of side guides 19 that rise from both side edges at approximately the midpoint between the one-side support 20 and the other-side support 30 (see FIG. 2). The length of the side guides 19 is approximately 10 cm, and the height is approximately 5 cm.

[0057] 1 to 5, a pair of rotating rollers 72 are provided at the tip of the left side (one side) of the base member 50. As a result, as shown in Figures 6 and 7, by moving the brake device 1 while tilting it so that the rotating rollers 72 roll on the ground, the convenience of the work of placing the brake device 1 below the flange of the cable drum is significantly improved. The diameter of the rotating rollers 72 is, for example, 4 cm.

[0058] The base member 50 can be folded in half with the underside facing inward by the hinge portion 71. This, combined with the fact that the one-side support column 20 and the other-side support column 30 can be folded relative to the base member 50, allows for a compact configuration for storage or transport, as shown in Figures 11 to 15. Furthermore, as shown in Figures 9 and 10, the folding and unfolding operations are assisted by the rotating rollers 72 rolling on the ground.

[0059] Furthermore, the base member 50 is provided with a pair of auxiliary handles 75 near the hinge portion 71. This makes the folding and unfolding operations even easier.

[0060] Furthermore, a main handle 74 for carrying the brake device 1 is provided on one of the left and right sides of the base member 50 (in this embodiment, the upper side in Fig. 2 (lower side in Fig. 3)), and four spacer stands 73 (made of hollow frames) for stationary placement of the brake device are arranged in a balanced manner on the other of the left and right sides of the base member (in this embodiment, the lower side in Fig. 2 (upper side in Fig. 3)). The presence of such main handle 74 makes it even easier to carry (see Fig. 13), and the presence of such spacer stands 73 allows for stable stationary storage (see Figs. 14 and 15).

[0061] [Effect] Next, the operation of the cable drum brake device 1 of this embodiment will be described with reference to Figures 6 to 8. Figures 6 and 7 are photographs showing the operation of placing the cable drum brake device 1 of this embodiment below the flange of the cable drum, and Figure 8 is an explanatory diagram showing the state in which the rubber strip 10 of the cable drum brake device 1 of this embodiment abuts against the flange, with Figure 8(a) showing the state before abutting against the flange and Figure 8(b) showing the state after abutting against the flange.

[0062] (installation) First, as shown in Figures 6 and 7, one side support 20 is folded relative to the base member 50 (the other side support 30 may be either folded or not), and the rubber strip 10 and base member 50 are arranged so as to pass under the flange of the cable drum from one side to the other in a horizontal direction perpendicular to the axial direction of the drum shaft (rod) supported by the cable jack and the cable drum.

[0063] At this time, as shown in Figures 6 and 7, by tilting and moving the brake device 1 so that the rotating roller 72 rolls on the ground, the operation of positioning the brake device 1 below the flange of the cable drum can be carried out significantly easily.

[0064] The pair of side guides 19 are then positioned so that they correspond to the lower end of the flange and are located on both sides of the flange (if necessary, the cable jack can be moved up and down). After positioning, the base member 50 is fixed to the floor using the height adjustment screws 52 of the fixing plate 51. Furthermore, the one-side support column 20 (and the other-side support column 30, if it was folded up) is returned to its upright position relative to the base member 50.

[0065] The cable drum brake device 1 of this embodiment can be used for cable drums with a flange diameter of up to 1700 mm. In other words, it can be widely applied regardless of the diameter of the cable drum or the size of the cable jack.

[0066] (operation) When it becomes necessary to brake the rotating cable drum, the pedal 61p is operated by foot, or a manual lever (e.g., a single pipe) is attached to the mounting part 61m and the manual lever is manually operated, causing the pivoting part 61 to pivot, and the right end of the rubber strip 10 to move away from the other support position (between the cylindrical pin 38 and the top plate 39) (see Figure 8(b)).

[0067] This applies tension to the rubber strip 10, and the arc-shaped form of the rubber strip 10 in a side view between the one-side support position (rubber strip fixing portion 21) and the other-side support position (between the cylindrical pin 38 and the top plate 39) is deformed so that the radius of curvature gradually increases. Accordingly, the rubber strip 10 between the one-side support position (rubber strip fixing portion 21) and the other-side support position (between the cylindrical pin 38 and the top plate 39) is lifted up.

[0068] Then, the rubber strip 10 comes into contact with the flange in an arc shape (however, the radius of curvature is different) that follows the flange, thereby starting the braking action.

[0069] At this time, the contact between the rubber strip 10 and the flange occurs over a relatively long (wide) area, which reduces the degree of localized wear, and thus the function of braking the cable drum can be maintained for a relatively long period of time without replacing the rubber strip 10.

[0070] Furthermore, the pair of side guides 19 effectively prevent the rubber strip 10 from coming off the flange during braking, allowing the flange to be braked more stably.

[0071] (Cancel operation) When the rotating cable drum is sufficiently braked, or when the need to brake the rotating cable drum is eliminated, the foot operation of the pedal 61p or the manual operation of the manual lever attached to the attachment part 61m is released, and the pivotable moving part 61 returns to its original position due to the action of the return spring, i.e., the right end of the rubber strip 10 moves in a direction approaching the other support position (between the cylindrical pin 38 and the top plate 39) (see Figure 8(a)).

[0072] This relieves the tension on the rubber strip 10, and the lifting action of the rubber strip 10 between the one side support position (rubber strip fixing portion 21) and the other side support position (between the cylindrical pin 38 and the top plate 39) disappears.

[0073] (Cancellation of installation) After removing the height adjustment screw 52, ​​while taking care not to cause interference (clash) between the side guide 19 and the flange (if necessary, the cable jack can be moved up and down), the rubber strip 10 and the base member 50 are pulled back from below the flange of the cable drum, with the one side support 20 folded against the base member 50 again as shown in Figures 6 and 7 (the other side support 30 may or may not be folded).

[0074] At this time, as shown in Figures 6 and 7, by tilting and moving the brake device 1 so that the rotating roller 72 rolls on the ground, the operation of pulling the brake device 1 back from below the flange of the cable drum can be performed significantly more easily.

[0075] [Guideline for maintenance work] It is preferable to replace the rubber strip 10 when wear marks become visible to the naked eye in the rubber strip 10. Furthermore, it is preferable to prohibit use of the rubber strip 10 when through holes due to wear become visible to the naked eye in the rubber strip 10.

[0076] [Collapse] The base member 50 is folded in half with the underside facing inward using the hinge portion 71. At this time, as shown in Figures 9 and 10, the folding operation can be performed significantly more easily by operating the rotating rollers 72 so that they roll on the ground.

[0077] The folded state of the base member 50 can be optionally locked by, for example, a corresponding hook 81 and pin 82 (see FIGS. 1 to 3) provided on the side of the base member 50.

[0078] The folding operation of the one-side support column 20 and the other-side support column 30 relative to the base member 50 precedes the folding operation of folding the base member 50 in half.

[0079] When the one-side support pillar 20, the other-side support pillar 30, and the base member 50 are all folded, the brake device 1 takes on a very compact form, and as shown in Figure 13, by using the main handle 74, it is extremely easy to carry.In addition, as shown in Figures 14 and 15, by using four spacer stands 73, the rubber strip 10 can be stored stably without coming into contact with the ground or the like and being rubbed.

[0080] [Unfold] After the hook 81 and the pin 82 are disengaged, the base member 50 is released from the folded state by again using the hinge portion 71 (rotating in the opposite direction to that of the folding operation). At this time, as shown in Figures 9 and 10, the rotating roller 72 is again operated so as to roll on the ground, which makes the unfolding operation significantly easier.

[0081] The unfolding operation of the base member 50 precedes the unfolding operation of the one side support column 20 and the other side support column 30 relative to the base member 50.

[0082] [Summary of effects] According to the cable drum brake device 1 of this embodiment, the rubber strip 10 is raised while the radius of curvature of the arc-shaped configuration in side view gradually increases, so that it can contact the flange in an arc-shaped configuration that follows the flange (however, the radius of curvature is different). In other words, the contact between the rubber strip 10 and the flange occurs over a longer (wider) area, reducing the degree of localized wear. This allows the rubber strip 10 to maintain its ability to brake the cable drum for a relatively long period of time without having to replace it.

[0083] Furthermore, according to the brake device 1 of this embodiment, a rotating roller 72 is provided at the tip of one side of the base member 50, and by tilting and moving the brake device 1 so that the rotating roller 72 rolls on the ground, the convenience of the work of placing the brake device 1 below the flange of the cable drum is significantly improved (see Figures 6 and 7).

[0084] Furthermore, according to the brake device 1 of this embodiment, the base member 50 can be folded in half with the underside facing inward, resulting in a compact form for storage or transport (see Figures 11 to 15), and furthermore, the presence of the rotating roller 72 makes the folding and unfolding operations easy (see Figures 9 and 10).

[0085] Furthermore, according to the brake device 1 of this embodiment, the one-side support pillar 20 and the other-side support pillar 30 can be folded relative to the base member 50, so that the brake device 1 can be made even more compact when stored or carried (see FIGS. 9 to 15).

[0086] In addition, the rubber strip 10 of this embodiment is made of a material in which five layers of synthetic rubber (each approximately 0.6 mm thick) and four layers of cotton (each approximately 0.6 mm thick) are alternately laminated, thereby achieving both high flexibility and high durability.

[0087] Furthermore, the cable drum brake device 1 of this embodiment can be operated not only by hand but also by foot, improving operability. Also, since the manual lever is attached at an acute angle (not parallel) to the rotational movement part 61, the direction of foot depression and the direction of hand lever operation are different. In other words, the device is designed so that the direction of foot depression and the direction of hand lever operation are independent of each other, making it easy to operate.

[0088] Furthermore, the rubber strip 10 of this embodiment is provided with a pair of side guides 19 that rise from both side edges at a substantially midpoint between the one-side support position and the other-side support position. This effectively prevents the rubber strip 10 from coming off the flange during braking, enabling more stable braking of the flange. [Explanation of symbols]

[0089] 1 Brake device 10 rubber strips 19 Lateral guide 20 One side support 21 Rubber strip fixing part 22 Lateral piece 23 Upper fixing plate 28 Cylindrical pin 30 Other side support 31 Rubber strip fixing part 32 Lateral piece 33 Upper fixing plate 38 Cylindrical pin 39 Top plate 48 Cylindrical pin 50 Base material 51 Fixed plate 52 Height adjustment screw 58 Cylindrical pin 61 Rotating moving part 61m attachment point 61p Pedal 71 Hinge part 72 Rotating Roller 73 Spacer stand 74 Main handle 75 Auxiliary Handle 81 Hook 82 pins

Claims

1. a rubber strip that is elongated in a plan view and that can be arranged to pass under the flange portion of the cable drum from one side to the other side in a horizontal direction perpendicular to the axial direction of the cable drum; one side support pillar supporting a portion of one side of the rubber strip at a one side support position higher than a lower end position of the flange portion; an other-side support pillar that supports a part of the other side of the rubber strip at an other-side support position that is higher than the lower end position of the flange portion; a rubber strip tensioning mechanism capable of applying tension to the rubber strip between the one-side support position and the other-side support position; a base member having the one-side support column and the other-side support column connected to an upper surface thereof; a rotating roller provided at a tip end of one side or the other side of the base member; Equipped with the rubber strip tensioning mechanism moves the other end of the rubber strip in a direction away from the other support position, thereby gradually increasing a radius of curvature of the arc shape of the rubber strip between the one support position and the other support position in a side view, and lifting the rubber strip between the one support position and the other support position, The one side support column and the other side support column are foldable relative to the base member, The base member can be folded in half with the lower surface side facing inward. A brake device for a cable drum, characterized in that

2. The base member can be folded in half via a hinge portion, The base member is provided with an auxiliary handle for folding and unfolding near the hinge portion.

2. A brake device for a cable drum according to claim 1.

3. a main handle for carrying the brake device is provided on one of the left and right sides of the base member; A spacer stand for stationary placement of the brake device is provided on the other of the left and right sides of the base member.

3. A brake device for a cable drum according to claim 1 or 2.

4. The rubber strip is made of a material containing synthetic rubber and cotton.

3. A brake device for a cable drum according to claim 1 or 2.

5. The rubber strip includes alternating layers of synthetic rubber and cotton.

5. A braking device for a cable drum according to claim 4.

6. The rubber strip has a thickness in the range of 4 to 7 mm.

5. A braking device for a cable drum according to claim 4.

7. The rubber strip tensioning mechanism includes: A rotational movement part; a manual lever or a mounting portion for mounting the manual lever provided on the rotational movement portion; a foot-operable pedal provided on the rotational movement part; have 3. A brake device for a cable drum according to claim 1 or 2.

8. The rubber strip is provided with a pair of side guides rising from both side edges at a substantially midpoint between the one-side support position and the other-side support position.

3. A brake device for a cable drum according to claim 1 or 2.

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