Drum belt attachment structure

Abstract

The belt and drum can be integrated with each other with a simple structure. [Solution] The drum belt mounting structure 10 comprises a cylindrical winding drum 14, a protrusion 14B formed on the outer peripheral surface OS of the winding drum 14 and protruding radially outward, a belt 20 having a folded-back portion 22 at one end which is folded back to form a layered structure, and a fastener (screw 30) which penetrates the folded-back portion 22 and fixes the folded-back portion 22 to the outer peripheral surface OS of the winding drum 14.

Description

[Technical field]

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

[0002] Conventionally, a drum for winding up a belt has been known as a device constituting a part of a winch device or the like. In the belt winding device disclosed in Patent Document 1, one end of a belt is folded over and placed on the outer circumferential surface of a cylindrical body (winding body) of a drum. A plate-shaped member curved along the outer circumferential surface of the winding body is placed as a pressing metal fitting on the folded-over portion of the belt. The belt is then attached to the winding body by a screw passing through the pressing metal fitting and the folded-over 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 winding drum, which causes a problem that the structure for attaching the belt to the drum becomes complicated.

[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, a protrusion formed on part of the outer surface of the winding drum and protruding radially outward, a belt having a folded portion at one end formed by folding the end over to form a layered structure, and a fastener that penetrates the folded portion and fixes the folded portion to the outer surface of the winding drum. Effect 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 unity of the belt and the drum with a simple structure. [Brief description of the drawings]

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

[0009] The following describes embodiments of the present disclosure. However, the present disclosure is not limited to the following embodiments. When an embodiment is described with reference to the drawings in the present disclosure, the configuration of the embodiment is not limited to the configuration shown in the drawings. In addition, the size of the members in each drawing is conceptual, and the relative relationship between the sizes of the members is not limited to this.

[0010] In the following description of the drawings, similar parts are given similar symbols. However, the drawings are schematic, and the relationship between thickness and planar dimensions, and the ratio of thickness, width, and depth of each device and each member are different from the actual ones. Therefore, the specific thickness and planar dimensions should be determined by taking into consideration the following explanation. In addition, there are parts in which the relationship and ratio of dimensions between the drawings differ from the actual ones. In addition, unless otherwise specified in the specification, the number of each component of the present disclosure is not limited to one, and there may be more than one.

[0011] <Configuration of the drum belt mounting structure> As shown in Fig. 1, the belt attachment 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 winding body 14 and a protruding portion 14B. The drum 12 is made of, for example, resin, but other materials such as metal may also be used.

[0012] (wrap part) As shown in Fig. 2, the winding drum 14 of the drum 12 according to this embodiment is cylindrical and has 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 a 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. The shaft 40 in this embodiment is cylindrical, but the shaft of the present disclosure is not limited to this and may have another shape, such as a cylindrical shape.

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

[0014] (protrusion) The protruding portion 14B is partially formed on the outer circumferential surface of the winding drum 14. As shown in FIG. 2, the protruding portion 14B protrudes radially outward (toward the lower side in FIG. 2) and is higher than other portions. The protruding portion 14B bites into the belt 20, and the resistance acting in the direction of holding the belt 20 to the winding drum 14 against the reaction force of the pulling force that pulls the belt 20 away from the winding drum 14 increases, and the locking effect of the winding drum 14 on the belt 20 is enhanced. As shown in FIG. 2, the protruding portion 14B is provided at a position opposite the key groove 14A1, and thus has 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, as long as an appropriate belt locking force is obtained depending on the application, the number of protruding portions is not limited to this and may be any number of one or more, and the position at which the protruding portion is provided is not limited to the position opposite the key groove and may be any position.

[0015] (Plane part) The winding drum 14X of the winding drum 14 according to this embodiment has a flat portion 14C. In the present invention, the flat portion is not essential. 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 portion 14E along the boundary line with 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 portion 14E formed by the flat portion 14C bites into the belt 20, thereby increasing the resistance acting in the direction of holding 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, and the locking effect of the winding drum 14 on the belt 20 is further enhanced. The flat portion 14C of the winding drum 14 is provided with a screw hole 14F with a female screw thread on the inner circumference as a female screw portion. In the present invention, the number of the 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 is formed in the center of each of the disks of the first flange portion 18A and the second flange portion 18B, the through hole being concentric with and having the same diameter as the shaft insertion hole 14A of the winding drum portion 14. The reference numerals in the drawings for the through holes of the first flange portion 18A and the second flange portion 18B are omitted.

[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. Meanwhile, the second flange portion 18B in this embodiment is provided in a detachable manner on the other axial end side of the winding drum portion 14 with a gap between the first flange portion 18A and the second flange portion 18B 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 by twisting and / or weaving, for example, 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 vegetable fibers. The drum 12 using the belt 20 may 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-back portion 22 at one end where the end is folded back to form a multi-layer structure. When the belt 20 is used for towing, for example, a hook or the like that engages with an object to be towed may be attached to the other end of the belt 20.

[0020] The folded portion 22 of this embodiment is a double portion formed by folding one end of the belt 20 once. The number of overlapping layers of the folded portion of the present invention is not limited to double, and can be changed appropriately to three, four, etc., as long as it has a tensile strength according to the application. The folded portion 22 is joined to the surface of the flat portion 14C of the winding drum 14. A screw hole 22A is provided at the position of the folded portion 22 of the belt 20 facing the screw hole 14F provided in the flat portion 14C of the winding drum 14. The screw hole 22A of 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, a seam may be formed on a part or the entire surface by sewing the layers of the folded-back portion together using a resin thread. The formation of the seam increases the adhesion between the layers of the folded-back portion, improving the tensile strength, and thus improving the unity between the belt and the hoisting body. 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 the present embodiment is a headed male screw, for example, a headed screw 30. The screw 30 passes through a screw hole 22A provided in the turn-back portion 22 and is screwed into a screw hole 14F provided in the flat portion 14C of the winding drum portion 14. The screw 30 fastens and fixes the turn-back portion 22, which abuts against its seat, to the flat portion 14C of the winding drum portion 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 according to the application, the turn-back 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 as a fastener according to this embodiment has an arch 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 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, and further improves the locking effect of the winding drum 14 on the belt 20. In the present invention, the shape of the head of the screw is not limited to an arch shape, and may be any cross-sectional shape and planar shape, such as a flat plate shape or a truncated cone shape.

[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 the folded portion 22 to the 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 portion 14 protrudes radially outward (toward the bottom in FIG. 2) and is higher than other portions, so that the protruding portion 14B comes into contact with and bites into the belt 20 being wound onto the outer circumferential surface OS of the winding drum portion 14, resulting in a resistance acting in a direction that holds back the belt 20. This improves the unity between the belt 20 and the winding drum portion 14.

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

[0027] In this embodiment, the flat portion 14C partially formed on the outer circumferential surface OS of the winding drum 14 forms a corner 14E along the boundary line with the adjacent curved portion 14D. Since 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, a case in which the belt is wound around a winding drum having only a curved outer circumferential surface.

[0028] In this embodiment, the screw 30, which is a headed screw, 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. Therefore, the resistance acting in the direction of holding the belt 20 to the winding drum 14 increases against the reaction force of the pulling force that tries to pull the belt 20 away from the winding drum 14, and the locking effect of the winding drum 14 on the belt 20 is further improved.

[0029] <Other embodiments> The present invention has been described by the embodiments disclosed above, but the descriptions and drawings forming part of this disclosure should not be understood as limiting the present invention. It should be considered that various alternative embodiments, examples and operation 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 invention-specific matters 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 Key groove 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 part 20 Belt 22 Folded section 22A screw hole 30 Screws (fixing device) 40 Shaft 42 Keys

Claims

1. A cylindrical winding body; A belt having a folded portion formed by folding back an end portion; a fastener for fastening the folded-back portion to an outer peripheral surface of the winding body; a protruding portion formed on a part of an outer circumferential surface of the winding body so as to protrude radially outward, around which the belt having the folded-back portion fixed thereto is wound; A belt mounting structure for a drum.

2. a flat portion formed partially on the outer circumferential surface of the winding drum and 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 fastener 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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