Belt attachment structure for drum

Abstract

To improve integration of a belt and a drum with a simple configuration.SOLUTION: A belt attachment structure 10 for a drum comprises: a cylindrical winding trunk 14; a protrusion 14B formed on an outer peripheral surface OS of the winding trunk 14 to protrude outside in a radial direction; a belt 20 having a folding part 22 folded at the end to be formed into a layered structure at one end; and a fastener (screw 30) that penetrates the folding part 22 to fix the folding part 22 to the outer peripheral surface OS of the winding trunk 14.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a belt mounting structure for a drum. [Background technology]

[0002] Conventionally, drums for winding up belts have been known as devices constituting a part of winch devices and the like. In the belt winding device disclosed in Patent Document 1, one folded end of a belt is placed on the outer circumferential surface of the cylindrical body (winding drum) of the drum. A plate-shaped member curved along the outer circumferential surface of the winding drum is placed on the folded portion of the belt as a pressing member. The belt is then attached to the winding drum with a screw that passes through the pressing member and the folded portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 58-53752 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of Patent Document 1, a plate-shaped member is required as a pressing metal fitting to attach the belt to the drum, which causes a problem of a complicated structure for attaching the belt to the drum.

[0005] The present invention provides a belt mounting structure for a drum that can reliably secure the unity of the belt and the drum with a simple structure. [Means for solving the problem]

[0006] The belt mounting structure for a drum of the present invention comprises a cylindrical winding drum portion, a protrusion formed on a part of the outer peripheral surface of the winding drum portion and protruding radially outward, a belt having a folded portion at one end formed by folding the end portion back to form a layered structure, and a fastener that penetrates the folded portion and fixes the folded portion to the outer peripheral surface of the winding drum portion. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a belt mounting structure for a drum that can reliably secure the integration of the belt and the drum with a simple structure. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a front view illustrating a belt mounting structure for a drum according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Embodiments of the present disclosure will be described below. However, the present disclosure is not limited to the following embodiments. When embodiments are described with reference to drawings in the present disclosure, the configuration of the embodiment is not limited to the configuration shown in the drawings. Furthermore, the sizes of components in each drawing are conceptual, and the relative size relationships between components are not limited to these.

[0010] In the following description of the drawings, like parts are designated by like reference numerals. However, the drawings are schematic, and the relationship between thickness and planar dimensions, and the ratios of thickness, width, and depth of each device and each component differ from the actual ones. Therefore, the specific thickness and planar dimensions should be determined with reference to the following explanation. Furthermore, the drawings also include parts where the dimensional relationships and ratios differ from the actual ones. Furthermore, unless otherwise specified in the specification, the number of each component of the present disclosure is not limited to one, and multiple components may be present.

[0011] <Configuration of the drum belt mounting structure> As shown in Fig. 1, the belt mounting structure 10 for a drum according to this embodiment includes a drum 12, a belt 20, and a screw 30 as a fastener. The drum 12 also includes a hoisting body 14 and a protrusion 14B. The drum 12 is made of, for example, resin, but may also be made of other materials such as metal.

[0012] (winding drum) As shown in FIG. 2, the winding drum 14 of the drum 12 according to this embodiment is cylindrical and includes a winding drum 14X, which is a portion sandwiched between an outer peripheral surface OS and an inner peripheral surface IS, and a shaft insertion hole 14A, which is a void inside the inner peripheral surface IS. The winding drum 14 is the main body of the drum 12. A shaft 40 that transmits rotational force to the drum 12 is inserted into the shaft insertion hole 14A of the winding drum 14, and the winding drum 14X of the winding drum 14 and the shaft 40 are fixed to each other via a key 42. While the shaft 40 in this embodiment is cylindrical, the shaft of the present disclosure is not limited thereto and may have another shape, such as a cylindrical shape.

[0013] As shown in FIG. 2, the winding drum 14X of the winding drum 14 according to this embodiment has a keyway 14A1 formed therein that has a constant depth in the radial direction from the inner peripheral surface IS and a constant opening dimension (the length is along the longitudinal direction of the winding drum 14X, and the width is perpendicular to the length) over the entire length of the winding drum 14X. In the present invention, the depth and opening dimension of the keyway are arbitrary as long as the rotational force is transmitted safely and sufficiently from the shaft to the winding drum depending on the application, and the keyway is not essential. A key 42 is fitted into the keyway 14A1 according to this embodiment, and is also simultaneously fitted into a shaft-side keyway 40A provided on the shaft 40, so that the key 42 is arranged in a fitted state on both the shaft 40 and the winding drum 14.

[0014] (protrusion) The protrusion 14B is formed partially on the outer peripheral surface of the winding drum 14. As shown in FIG. 2, the protrusion 14B protrudes radially outward (toward the lower side in FIG. 2) and is higher than other portions. The protrusion 14B bites into the belt 20, thereby increasing the resistance acting in a direction that tries to hold the belt 20 to the winding drum 14 against the reaction force of the pulling force that tries to pull the belt 20 away from the winding drum 14, thereby improving the locking effect of the winding drum 14 on the belt 20. Also, as shown in FIG. 2, the protrusion 14B is provided at a position facing the key groove 14A1, thereby also having the effect of compensating for and reinforcing the thickness of the drum of the winding drum 14 that is thinned by the formation of the key groove 14A1. Note that in the present invention, the number of protrusions is not limited to this and can be any number greater than one, as long as an appropriate belt locking force is obtained depending on the application, and the position of the protrusion is also not limited to a position facing the key groove and can be any position.

[0015] (Plane part) The winding drum 14X of the winding drum 14 according to this embodiment includes a flat portion 14C. The flat portion 14C is not essential in the present invention. The flat portion 14C is partially formed on the outer peripheral surface OS of the winding drum 14. The flat portion 14C forms a corner 14E along the boundary between the flat portion 14C and the adjacent curved portion 14D. As shown in FIG. 2 , the winding drum 14 according to this embodiment has a substantially elliptical shape in cross section due to the formation of the protrusion 14B and the flat portion 14C. The corner 14E formed by the flat portion 14C bites into the belt 20, thereby increasing the resistance acting in a direction that tries to hold the belt 20 to the winding drum 14 against the reaction force of the pulling force that tries to pull the belt 20 away from the winding drum 14, further enhancing the locking effect of the winding drum 14 on the belt 20. The flat portion 14C of the winding drum 14 is provided with a screw hole 14F with a female thread on the inner periphery as a female thread portion. In the present invention, the number of screw holes may be any number greater than or equal to one, depending on the required tensile strength of the belt to be fixed using the screw holes.

[0016] (flange part) 1, the drum 12 according to this embodiment includes a first flange portion 18A and a second flange portion 18B. In the present invention, the first flange portion and the second flange portion are not essential.

[0017] The first flange portion 18A and the second flange portion 18B are disk-shaped. A through-hole of the same diameter and concentric with the shaft insertion hole 14A of the winding drum 14 is formed in the center of each of the disks of the first flange portion 18A and the second flange portion 18B. The reference numerals for the through-holes of the first flange portion 18A and the second flange portion 18B are omitted in the drawings.

[0018] In this embodiment, the first flange portion 18A is provided in a fixed state integral with one axial end side of the winding drum portion 14. On the other hand, the second flange portion 18B in this embodiment is provided in a detachable state with respect to the winding drum portion 14 in the other axial end side of the winding drum portion 14 with a gap between it and the first flange portion 18A that allows the belt 20 to be sandwiched in the width direction.

[0019] (belt) The belt 20 is a belt-shaped member. The belt 20 is made, for example, by twisting and / or weaving resin threads. In the present invention, the material of the belt is not limited to this as long as it has the required tensile strength, and may be made, for example, by weaving thin metal wires into plant fibers. The drum 12 using the belt 20 can be used for any purpose, such as towing or conveying, and the tensile strength of the belt 20 is a design option determined according to each purpose. The belt 20 has a folded portion 22 at one end, which is formed by folding back the end to form a layered structure. If the belt 20 is used for towing, for example, a hook or the like that engages with the object to be towed may be attached to the other end of the belt 20.

[0020] The folded portion 22 in this embodiment is a double portion formed by folding one end of the belt 20 back once. The number of overlapping layers in the folded portion of the present invention is not limited to double, and can be changed as appropriate to three, four, etc., as long as the tensile strength is sufficient for the application. The folded portion 22 is bonded to the surface of the flat portion 14C of the winding drum 14. A screw hole 22A is formed in the folded portion 22 of the belt 20 at a position opposite to the screw hole 14F formed in the flat portion 14C of the winding drum 14. The screw hole 22A in the folded portion 22 can be formed, for example, by pressing a heated metal rod against the belt 20 to partially melt the material of the belt 20.

[0021] Although not shown in the drawings, in the present invention, stitching may be performed on a part or the entire surface of the folded-back portion by sewing the layers together using a resin thread. The formation of stitching increases the adhesion between the folded-back portions and improves the tensile strength, thereby improving the unity between the belt and the hoisting drum. The same effect can be obtained by bonding the layers together with an adhesive or the like instead of sewing the layers together.

[0022] (Fixing fixture) The fastener according to this embodiment is a headed male screw, such as a headed screw 30. The screw 30 passes through a screw hole 22A provided in the turn-up portion 22 and threads into a screw hole 14F provided in the flat portion 14C of the winding drum 14. The screw 30 fastens and fixes the turn-up portion 22, which abuts its seat, to the flat portion 14C of the winding drum 14. Note that in the present invention, the screw is not limited to this, and any screw of any shape may be used as long as it has the required fastening force. Also, in the present invention, the fastener is not limited to a screw, and as long as it has the fixing force appropriate for the application, the turn-up portion and the flat portion may be fixed using, for example, a combination of a stud bolt (stud bolt) with a base embedded in the flat portion and a nut, adhesive, welding, or other means.

[0023] As shown in Fig. 2, the head of the screw 30 serving as the fastener according to this embodiment has an arched shape that protrudes upward in a cross-sectional view. Therefore, as shown in Fig. 1 or 2, the top of the screw 30 comes into contact with and bites into the belt 20 wound around the winding drum 14. This increases the resistance that acts in a direction that tries to hold the belt 20 to the winding drum 14 against the reaction force of the pulling force that tries to pull the belt 20 away from the winding drum 14, further improving the locking effect of the winding drum 14 on the belt 20. In the present invention, the shape of the screw head is not limited to an arched shape, and any cross-sectional and planar shape may be used, such as a flat plate or a truncated cone.

[0024] With screw hole 22A provided in folded portion 22 of belt 20 overlapping screw hole 14F provided in flat portion 14C of winding drum 14, screw 30 is inserted into screw hole 22A of folded portion 22 and screw hole 14F of winding drum 14, and the threaded portions are screwed together to fasten, thereby fixing folded portion 22 to winding drum 14.

[0025] (Action and effect) In the drum belt attachment structure 10 according to this embodiment, the protruding portion 14B of the winding drum 14 protrudes radially outward (toward the bottom in FIG. 2) and is higher than other portions, so that the protruding portion 14B abuts against and bites into the belt 20 being wound onto the outer peripheral surface OS of the winding drum 14, resulting in a resistance force acting in a direction that holds back the belt 20. This improves the unity between the belt 20 and the winding drum 14.

[0026] Furthermore, compared to an attachment method in which, for example, the flat surface 14C is not provided on the winding drum 14 and one end of the belt 20 is attached with an adhesive to a rounded, cylindrical surface portion of the winding drum 14, the present embodiment reduces the risk of the belt 20 coming off the winding drum 14. For example, when the drum 12 equipped with the belt attachment structure 10 for a drum of the present embodiment is used for towing work, even if a strong force acts on the belt 20 when towing a heavy load, the belt 20 is less likely to come off the winding drum 14. Furthermore, the adhesive that secures the belt 20 to the winding drum 14 will not melt due to high temperatures, for example in summer, causing the belt 20 to come off the winding drum 14.

[0027] In this embodiment, a flat portion 14C partially formed on the outer peripheral surface OS of the winding drum 14 forms a corner 14E along the boundary line with the adjacent curved portion 14D. Because the belt 20 bites into the corner 14E, the locking effect of the winding drum 14 on the belt 20 is enhanced compared to, for example, when the belt is wound around a winding drum having only a curved outer peripheral surface.

[0028] In this embodiment, a headed screw 30 is used as the fastener. The head of the screw 30 is arch-shaped and protrudes upward in a cross-sectional view. Therefore, as shown in FIG. 1 or 2, the top of the head of the screw 30 comes into contact with and bites into the belt 20 wound around the winding drum 14. This increases the resistance acting in a direction that tries to hold the belt 20 to the winding drum 14 against the reaction force of the pulling force that tries to pull the belt 20 away from the winding drum 14, further improving the locking effect of the winding drum 14 on the belt 20.

[0029] <Other embodiments> The present invention has been described using the embodiments disclosed above, but the descriptions and drawings that form part of this disclosure should not be understood to limit the present invention. It should be understood that various alternative embodiments, examples, and operating techniques will become apparent to those skilled in the art from the present invention. The present invention includes various embodiments not described above, and the technical scope of the present invention is defined only by the specific aspects of the invention in the claims that are appropriate from the above description. [Explanation of symbols]

[0030] 10 Drum belt mounting structure 12 drums 14 Winding body 14X cylinder part OS outer surface IS inner surface 14A Shaft insertion hole 14A1 keyway 40A Shaft side keyway 14B Protrusion 14C Flat part 14D curved section 14E Corner 14F screw hole (female thread) 18A First flange 18B Second flange 20 Belt 22 Folded section 22A screw hole 30 screws (fixing device) 40 shaft 42 keys

Claims

1. A cylindrical winding body; a protrusion formed on a part of the outer peripheral surface of the winding drum and protruding radially outward; a belt having a folded portion at one end formed by folding back an end portion to form a layered structure; a fastener that penetrates the folded-back portion and fixes the folded-back portion onto the outer peripheral surface of the winding drum; A belt mounting structure for a drum.

2. a flat portion formed partially on the outer circumferential surface of the drum portion, the flat portion forming a corner between the flat portion and an adjacent curved portion; 2. The belt mounting structure for a drum according to claim 1.

3. The fixing device is a headed male screw that screws into a female screw portion provided on the flat portion.

3. The belt mounting structure for a drum according to claim 2.

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