Cargo fastening buckle and cargo belt with cargo fastening buckle

Abstract

To provide a cargo fastening buckle capable of fastening a cargo in a short time regardless of the amount of the cargo.SOLUTION: A cargo fastening buckle 10 has: a frame-shaped body 20 having a pair of rod-shaped or plate-shaped side frames, a belt fixing shaft that is hung across the pair of side frames at one longitudinal end part of the side frames, and a belt locking shaft that is hung across the pair of side frames at the other longitudinal end part of the side frames; a belt pressing tool 30 that is attached to the body 20 so as to be able to move towards or away from the belt locking shaft and presses a belt 2 against the belt locking shaft; and a slip-out prevention device 40 that prevents the belt 2 from slipping out of the body 20. One of the pair of side frames has a belt insertion port 25 through which the belt 2 can be inserted, located along the surface where the belt fastening shaft and the belt pressing tool 30 come into contact. The slip-out prevention device 40 is attached to a side frame so as to be able to open and close the belt insertion port 25.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cargo securing buckle and a cargo securing belt equipped with the cargo securing buckle. [Background technology]

[0002] Conventionally, there have been known cargo securing belts that secure cargo to a support to prevent the cargo from falling over during transport, such as when stacking cargo such as cardboard boxes packed with items in multiple layers and loading them onto the bed of a freight truck, or when loading cargo onto the bed of a vehicle such as a flatbed freight truck (for example, Patent Document 1).

[0003] A tethering belt such as that described in Patent Document 1 includes a band-shaped belt and a buckle for fastening the belt. Generally, the buckle of a tethering belt includes a pair of rod- or plate-shaped side frames, a belt fixing shaft provided at one longitudinal end of the side frames and suspended between the pair of side frames, a belt locking shaft provided at the other longitudinal end of the side frames and suspended between the pair of side frames, and a belt retainer for holding the belt against the belt locking shaft. The belt retainer includes a belt retainer portion provided at a position slightly spaced from the circumferential surface of the belt locking shaft, and a lever portion for moving the belt retainer portion in a direction further away from the belt locking shaft.

[0004] These types of tethering belts include those that use a single belt looped into a loop and fastened at both ends with buckles to secure the load, and those that use two belts, one end of each belt fastened to a support such as the trunk of a vehicle, and the other end of each belt fastened with a buckle to secure the load to the support. A single-belt tethering belt secures the load by permanently attaching one end to a belt fixing shaft and hooking the other end to a belt locking shaft and pressing the belt against the belt locking shaft with a belt holder. A two-belt tethering belt secures the load by having one end of each belt fixed to a support and the other end of one of the belts permanently attached to a belt fixing shaft. The other end of the other belt is then hooked to a belt locking shaft and pressed against the belt locking shaft with a belt holder to secure the load. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-019028 Summary of the Invention [Problem to be solved by the invention]

[0006] However, with such a load-tightening belt, when hooking the belt onto the belt-holding shaft, the free end of the belt must be inserted between the belt-holding shaft and the belt holder, and the end of the belt must be pulled to a position where the load can be secured, adjusting the length of the belt, and then the belt must be held down with the belt holder. Generally, load-tightening belts tend to be long so as to be versatile. Therefore, when the amount of load is small and a short belt length is sufficient for securing the load, it is necessary to continue pulling the end of the belt until the belt length is shortened, which results in the problem of taking a long time to secure the load.

[0007] The present invention has been made to solve the above-mentioned problems, and aims to provide a cargo securing buckle that can secure cargo in a short time regardless of the amount of cargo, and a cargo securing belt equipped with the cargo securing buckle. [Means for solving the problem]

[0008] The cargo securing buckle of the present invention comprises a pair of rod-shaped or plate-shaped side frames, a belt fixing shaft provided at one longitudinal end of the side frames and spanning the pair of side frames, and a belt locking shaft provided at the other longitudinal end of the side frames and spanning the pair of side frames, a frame-shaped main body, a belt holder attached to the main body so as to be able to move toward or away from the belt locking shaft and press the belt against the belt locking shaft, and a stopper for preventing the belt from slipping out of the main body. One of the pair of side frames has a belt insertion opening through which the belt can be inserted, located along the surface where the belt locking shaft and the belt holder meet. The stopper is attached to the side frame so as to be able to open and close the belt insertion opening.

[0009] In a preferred embodiment of the cargo securing buckle, the retaining device includes a hook, a hook fixing shaft that rotatably fixes the hook, a hook locking projection that locks the hook, and a hook elastic member on the hook fixing shaft that urges the hook toward the side frame. The hook fixing shaft and the hook locking projection are provided on the side frame with the belt insertion opening between them.

[0010] In a more preferred embodiment of the cargo securing buckle, the hook has a tensile strength of 41 MPa or more.

[0011] In another more preferred embodiment of the cargo securing buckle, the hook is made of metal.

[0012] The cargo securing belt of the present invention comprises the cargo securing buckle described above and a belt attached to the cargo securing buckle. [Effects of the Invention]

[0013] The cargo securing buckle and cargo securing belt of the present invention can secure cargo in a short time regardless of the amount of cargo. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing a cargo securing belt according to one embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the securing buckle of the securing belt of FIG. 1. [Figure 3] FIG. 2 is a rear view of the securing buckle of the securing belt of FIG. 1. [Figure 4] FIG. 2 is a plan view of the securing buckle of the securing belt of FIG. 1. [Figure 5] 2 is a bottom view of the securing buckle of the securing belt of FIG. 1. FIG. [Figure 6] FIG. 2 is a left side view of the securing buckle of the securing belt of FIG. 1. [Figure 7] FIG. 2 is a right side view of the securing buckle of the securing belt of FIG. 1. [Figure 8] FIG. 2 is a vertical cross-sectional view of the securing buckle of the securing belt of FIG. 1. [Figure 9] FIG. 2 is a perspective view of the cargo securing belt of FIG. 1, showing a state in which the hooks are open. [Figure 10] 1 is a graph showing the results of a tensile test in Example 1. [Figure 11] 1 is a graph showing the results of a tensile test in Example 2. [Figure 12] 10 is a graph showing the results of a tensile test in Example 3. [Figure 13] 1 is a graph showing the results of a tensile test in Comparative Example 1. [Figure 14] 10 is a graph showing the results of a tensile test in Comparative Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0016] First, the lashing belt 1 according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a perspective view showing the lashing belt 1 according to this embodiment. In the following, as shown in Fig. 1, the front side is the side where the hook 41 is provided, and the left-right direction is the direction in which the belt 2 extends, and the front-rear direction and the left-right direction are defined. The direction perpendicular to the front-rear direction and the left-right direction is defined as the up-down direction.

[0017] As shown in Figure 1, the securing belt 1 includes a securing buckle 10 and a belt 2 attached to the securing buckle 10. The belt 2 is formed by weaving a yarn made of twisted natural or chemical fibers into a strip of any length, similar to the belts used in known securing belts. The belt 2 may consist of one belt 2 or two belts 2.

[0018] When the belt 2 is made up of a single piece of belt, one end of the belt 2 is permanently attached to one end of the securing buckle 10 (the right end in FIG. 1) by sewing, bonding, or welding. The belt 2 is used in a loop, and the other end of the belt 2 is fastened to the other end of the securing buckle 10 (the left end in FIG. 1) to secure the cargo.

[0019] When the belt is made up of two belts 2, a fastener (not shown) is attached to one end of each belt 2 for fastening to a support (not shown) such as the trunk of a car. The other end of one of the two belts 2, which does not have the fastener, is permanently attached by sewing, bonding, or welding to one end of the securing buckle 10, the right end in FIG. 1. The fastener of each belt 2 is attached to the support, and the belt 2 not attached to the securing buckle 10 is fastened to the other end of the securing buckle 10, the left end in FIG. 1, to secure the cargo to the support.

[0020] In the following, whether the belt 2 is configured as one piece or two pieces, the end that is irremovably attached to the securing buckle 10 will be referred to as the fixed end 2a of the belt 2, and the end that is not attached to the securing buckle 10 will be referred to as the free end 2b of the belt 2.

[0021] Next, the cargo securing buckle 10 according to this embodiment will be described with reference to Figs. 2 to 8. Fig. 2 is a front view of the cargo securing buckle 10 of the cargo securing belt 1 of this embodiment. Fig. 3 is a rear view of the cargo securing buckle 10 of the cargo securing belt 1 of this embodiment. Fig. 4 is a plan view of the cargo securing buckle 10 of the cargo securing belt 1 of this embodiment. Fig. 5 is a bottom view of the cargo securing buckle 10 of the cargo securing belt 1 of this embodiment. Fig. 6 is a left side view of the cargo securing buckle 10 of the cargo securing belt 1 of this embodiment. Fig. 7 is a right side view of the cargo securing buckle 10 of the cargo securing belt 1 of this embodiment. Fig. 8 is a vertical cross-sectional view of the cargo securing buckle 10 of the cargo securing belt 1 of this embodiment. Note that a vertical cross-sectional view is a cross-sectional view taken along a vertical plane extending in the left-right direction.

[0022] The cargo securing buckle 10 comprises a main body 20, a belt holder 30, and a slip-off prevention device 40.

[0023] The main body 20 has a frame shape. Specifically, the main body 20 includes a pair of side frames 21, a belt fixing shaft 22, a belt locking shaft 23, and a support member 24.

[0024] The side frame 21 is rod-shaped or plate-shaped. In this embodiment, the side frame 21 is plate-shaped and has an arbitrary shape when viewed from the front. The belt fixing shaft 22 is provided at one end of the side frame 21 in the longitudinal direction (left-right direction), i.e., the right end in this embodiment, and is suspended across the pair of side frames 21. The belt fixing shaft 22 is rod-shaped and has a substantially circular cross section. The belt locking shaft 23 is provided at the other end of the side frame 21 in the longitudinal direction, i.e., the left end in this embodiment, and is suspended across the pair of side frames 21. The belt locking shaft 23 is rod-shaped and has a substantially track-shaped cross section. The surface of the belt locking shaft 23 facing the belt presser 30, i.e., the right surface, is formed with multiple steps 231 extending along the longitudinal direction of the belt locking shaft 23 and having a stepped cross section in order to increase frictional force with the belt 2. The support member 24 is provided at the longitudinal center of the side frame 21 and suspended across the pair of side frames 21. The support member 24 has a rod shape with a rectangular cross section.

[0025] The belt fixing shaft 22, the belt locking shaft 23, and the support member 24 have lengths approximately equal to the width (front-rear) length of the belt 2, and are formed integrally with the pair of side frames 21. The main body 20 is made of a material such as metal or resin that is used for the main body of a buckle for securing any known cargo securing belt. The shape of the main body 20 is not limited to the above-mentioned shape, and can be the same shape as the main body of a buckle for securing any known cargo securing belt.

[0026] One of the pair of side frames 21, the front side frame 21 in this embodiment, has a belt insertion opening 25 into which the belt 2 can be inserted. The belt insertion opening 25 is formed at a position along the surface where the belt fastening shaft 23 and the belt presser 30 come into contact. Specifically, the belt insertion opening 25 is formed at a position along the surface (right surface) of the belt fastening shaft 23 that faces the belt presser 30. The belt insertion opening 25 has a width (left-right length) that allows the belt 2 to be inserted, and is provided across the entire short side direction (up-down direction) of the side frame 21. In other words, the side frame 21 in which the belt insertion opening 25 is provided is configured by arranging two plate-like members spaced apart in the left-right direction by a width slightly larger than the thickness of the belt 2.

[0027] The belt presser 30 is a device that presses the belt 2 against the belt fastening shaft 23. The belt presser 30 includes an operating part 31, a main body part 32, a presser shaft 33, and a presser elastic member 34.

[0028] The operating part 31 is a member that the user operates when attaching or detaching the free end 2b (see FIG. 1) of the belt 2 to or from the securing buckle 10. The main body 32 is a member that presses the belt 2 against the belt fastening shaft 23. The operating part 31 is plate-shaped, and the main body 32 is rod-shaped with a generally track-shaped cross section. The operating part 31 and the main body 32 are integrally formed, and have a width (length in the front-to-rear direction) that is generally equal to the width of the belt 2 and that can be disposed between the pair of side frames 21. A diagonal lattice-shaped groove 321 is formed on the surface of the main body 32 that faces the belt fastening shaft 23, i.e., the left surface, to increase the frictional force with the belt 2.

[0029] The presser shaft 33 is a member that attaches the belt presser 30 to the main body 20. The presser shaft 33 has a rod shape with a substantially circular cross section. The presser shaft 33 is installed across the pair of side frames 21 by being inserted into through holes (not shown) formed in the pair of side frames 21. The main body 32 has a through hole (not shown) for inserting the presser shaft 33, and by inserting the presser shaft 33 into the through hole, the main body 32 is rotatably attached to the main body 20. At this time, the main body 32 and the presser shaft 33 are positioned such that one curved surface of the main body 23, which in this embodiment is the right curved surface, is in contact with the belt fastening shaft 23, and by rotating the main body 32 as shown by the two-dot chain line in FIG. 8 , one curved surface of the main body 32 (the right curved surface) is positioned away from the belt fastening shaft 23. As a result, the belt presser 30 is attached to the main body 20 so as to be movable toward or away from the belt fastening shaft 23. The operation unit 31 is provided on the top surface of the main body 32, inclined with respect to the vertical plane.

[0030] The presser elastic member 34 is an elastic member that biases the belt presser 30 in a direction that presses the belt 2 against the belt-holding shaft 23. In this embodiment, the presser elastic member 34 is configured as a torsion spring consisting of a coil portion 341 and two straight portions 342 extending from both ends of the coil portion 341. The main body portion 32 is formed with a housing portion 322 for housing the presser elastic member 34. The presser elastic member 34 is housed in the housing portion 322 of the main body portion 32 and is attached to the presser shaft 33 by inserting the presser shaft 33 into the coil portion 341. At this time, one of the straight portions 342 contacts the upper surface of the support member 24, and the other contacts the lower surface of the operating unit 31. The presser elastic member 34 is configured so that, at its natural length, the main body portion 32 can be positioned in a state in which it is in contact with the belt-holding shaft 23. That is, when the main body 32 rotates and moves away from the belt fastening shaft 23 , the presser elastic member 34 biases the main body 32 in a direction in which it comes into contact with the belt fastening shaft 23 .

[0031] The belt holder 30 is made of a material such as metal or resin that is used for belt holders of any known cargo securing belt buckles. Note that the belt holder 30 is not limited to the above shape, and can have the same shape as any known belt holder of any known cargo securing belt buckle.

[0032] The stopper 40 is a device that prevents the belt 2 from slipping out of the main body 20. The stopper 40 is attached to the side frame 21 in which the belt insertion opening 25 is formed so as to be able to open and close the belt insertion opening 25.

[0033] In this embodiment, the retaining device 40 includes a hook 41, a hook fixing shaft 42 that fixes the hook 41 so that the hook 41 can rotate, a hook locking projection 43 that locks the hook 41, and an elastic member 44 for the hook.

[0034] The hook fixing shaft 42 is composed of a rod-shaped shaft body 421 having a generally circular cross section and a flange 422 provided at one end of the shaft body 421 and protruding circumferentially outward from the shaft body 421. The hook locking projection 43 is composed of a rod-shaped projection body 431 having a generally circular cross section and a flange 432 provided at one end of the projection body 431 and protruding circumferentially outward from the projection body 431. The hook fixing shaft 42 and the hook locking projection 43 are provided on the side frame 21 in which the belt insertion opening 25 is formed, with the belt insertion opening 25 sandwiched between them. In this embodiment, the hook fixing shaft 42 is provided on the side frame 21 to the left of the belt insertion opening 25, and the hook locking projection 43 is provided on the side frame 21 to the right of the belt insertion opening 25. In this case, the hook fixing shaft 42 and the hook locking projection 43 are spaced apart by the length of the hook 41 (length in the left-right direction).

[0035] The hook fixing shaft 42 and the hook locking projection 43 may be formed integrally with the side frame 21, or may be formed separately from the side frame 21 and attached to the side frame 21 by bonding, welding, or the like. Alternatively, male threads may be formed on the ends of the shaft body 421 of the hook fixing shaft 42 and the projection body 431 of the hook locking projection 43 where the flanges 422, 432 are not provided, and female threads may be formed on the side frame 21, and the hook fixing shaft 42 and the hook locking projection 43 may be attached to the side frame 21 by engaging the threads with each other. Since the hook 41 is rotatably attached to the shaft body 421 of the hook fixing shaft 42, the flange 422 is configured to be detachable if the hook fixing shaft 42 is formed integrally, or is attached to the side frame 21 after the hook 41 is engaged with the shaft body 421 if the hook fixing shaft 42 is formed separately.

[0036] The hook 41 has a plate shape. The hook 41 has an engagement opening 411 at one end that engages with the hook locking protrusion 43, and a through-hole 412 at the other end through which the hook fixing shaft 42 is inserted. The engagement opening 411 penetrates the hook 41 in the thickness direction (front-rear direction) of the hook 41 and is open from one end to near the center in the width direction (up-down direction) of the hook 41. The engagement opening 411 is engageable with the protrusion body 431 of the hook locking protrusion 43 and has a width (left-right length) smaller than that of the flange 432 of the hook locking protrusion 43. The through-hole 412 is formed by penetrating the hook 41 in the thickness direction (front-rear direction) of the hook 41. The shaft body 421 of the hook fixing shaft 42 can be inserted into the through-hole 412 so as to be rotatable about the shaft body 421 of the hook fixing shaft 42, and is smaller in size than the flange 422 of the hook fixing shaft 42. The engagement opening 411 and the through hole 412 are formed at a position where the hook fixing shaft 42 can be inserted into the through hole 412 and the hook locking projection 43 can be engaged with the engagement opening 411 .

[0037] The hook 41 has a length that allows it to be engaged between the hook fixing shaft 42 and the hook locking protrusion 43. The hook 41 also has a width that opens the belt insertion opening 25 when the hook 41 is rotated about the hook fixing shaft 42 as an axis, as shown by the two-dot chain line in Fig. 2. The hook 41 preferably has a width (vertical length) and a thickness (front-rear length) that are approximately equal to those of the side frame 21. In other words, the hook fixing shaft 42 is provided at a position where the belt insertion opening 25 opens when the hook 41 is rotated about the hook fixing shaft 42 as an axis and moved to a position where the longitudinal direction of the hook 41 is aligned with the vertical direction.

[0038] Hook 41 is made of any material such as metal or resin. Hook 41 preferably has a tensile strength of 41 MPa or more, which is the tensile strength of general vinyl chloride, and is particularly preferably made of metal, which has a tensile strength greater than that of vinyl chloride. Hook 41 may also be integrally formed with a grip that makes it easy to open and close hook 41.

[0039] The hook elastic member 44 is an elastic member that biases the hook 41 on the hook fixing shaft 42 toward the side frame 21. In this embodiment, the hook elastic member 44 is configured by a coil spring. The hook elastic member 44 has a diameter that is larger than the diameter of the shaft body 421 of the hook fixing shaft 42 and smaller than the diameter of the flange 422 of the hook fixing shaft 42. In addition, the hook elastic member 44 is attached to the shaft body 421 of the hook fixing shaft 42, and has a length that enables the biasing force of the hook elastic member 44 to press the hook 41 toward the side frame 21 when in contact with the flange 422 of the hook fixing shaft 42.

[0040] The hook 41 is attached to the main body 20 as follows. Generally, in order to rotatably attach the belt presser 30 to the main body 20, the main body 32 is disposed between a pair of side frames 21, and the presser shaft 33 is inserted sequentially through the through-hole of one side frame 21, the through-hole of the main body 32, and the through-hole of the other side frame 21, and attached to the side frames 21 by riveting the presser shaft 33 to the side frames 21 from the outside (front and rear sides) of the side frames 21. For this reason, it is preferable to interpose a washer 45 between the hook 41 and the side frame 21 in the hook fixing shaft 42, the washer 45 having a thickness equivalent to the thickness (front-rear length) of the rivet joining the presser shaft 33 to the side frame 21. That is, the hook fixing shaft 42 has the hook elastic member 44, the hook 41, and the washer 45 inserted into the shaft body 421 in this order from the side that abuts against the flange 422, and then the end of the shaft body 421 of the hook fixing shaft 42 is attached to the side frame 21. In this way, the hook 41 is attached to the main body 20.

[0041] Next, the use of the cargo securing belt 1 and the cargo securing buckle 10 will be described with reference to Fig. 9. Fig. 9 is a perspective view of the cargo securing belt 1 of this embodiment, showing the state in which the hook 41 is open.

[0042] As in the conventional method, the user places the belt 2 of the cargo securing belt 1 over multiple pieces of luggage to be secured, or over the luggage and a support, and brings the free end 2b of the belt 2 to the cargo securing buckle 10. At this time, the belt 2 is positioned near the cargo securing buckle 10 at a position where the luggage can be secured. When hooking the free end 2b of the belt 2 into the cargo securing buckle 10, the hook 41 is rotated to the position shown in FIG. 9 to open the belt insertion opening 25. Then, the user operates the operating unit 31 to move the main body 32 of the belt holder 30 away from the belt locking shaft 23, and inserts the belt 2 from the belt insertion opening 25 into between the main body 32 of the belt holder 30 and the belt locking shaft 23. The user then fine-tunes the length of the belt 2 to a length that allows the luggage to be securely secured to each other or to a support, and releases the operating unit 31.

[0043] When the user releases the operating part 31, the biasing force of the holder elastic member 34 moves the main body 32 of the belt holder 30 in a direction approaching the belt fastening shaft 23. Then, the belt holder 30 presses the belt 2 against the belt fastening shaft 23. After that, the user rotates the hook 41 to the position shown in FIG. 1, and engages the engagement opening 411 of the hook 41 with the hook fastening protrusion 43, thereby closing the belt insertion opening 25. [Example]

[0044] Next, the cargo securing belt 1 and the cargo securing buckle 10 according to the above embodiment will be specifically described using examples.

[0045] In this example, a tensile test is performed using the cargo securing belt 1 of the above embodiment to evaluate the tensile strength of the cargo securing belt 1. Here, the tensile test is performed on Examples 1 to 3 and Comparative Examples 1 and 2 based on the cargo securing belt 1 of the above embodiment.

[0046] The securing belt 1 used in Examples 1 to 3 and Comparative Examples 1 and 2 is constructed based on a commercially available securing belt (sold by Konan Shoji Co., Ltd.). That is, the belt 2, the main body 20 of the securing buckle 10, and the belt holder 30 are all the same in Examples 1 to 3 and Comparative Examples 1 and 2.

[0047] In Examples 1 to 3, the commercially available securing belt described above was used, but as shown in the above embodiment, a belt insertion opening 25 was formed in one of the side frames 21, and a stopper 40 was attached to that side frame 21. The stopper 40 was a plate-shaped hook 41 with a width (vertical length) of 13 mm and a thickness (front-rear length) of 3 mm. The hooks 41 in Examples 1 to 3 were made of different materials as follows: Material of the hook 41 in Example 1: chromium with a tensile strength of 418 MPa Material of the hook 41 in Example 2: Aluminum with a tensile strength of 60 MPa Material of the hook 41 in Example 3: vinyl chloride with a tensile strength of 41 MPa

[0048] Comparative Example 1 is the same as the commercially available lashing belt described above, but is not provided with the belt insertion opening 25 and the retaining device 40. Comparative Example 2 is a lashing belt that is different from the commercially available lashing belt described above, but has a belt insertion opening 25 formed in one of the side frames 21, as shown in the above embodiment. Comparative Example 2 is not provided with the retaining device 40.

[0049] Generally, a load-bearing capacity of 80 kgf is required for a cargo securing belt 1. The load generated when securing a load with the cargo securing belt 1 is a tensile load applied to the cargo securing buckle 10 when the belt 2 is pulled by the load. Here, the belts 2 extending in the left and right directions of the cargo securing belt 1 are cut to lengths of approximately 20 cm, and one of the belts 2 is irremovably attached to the belt fixing shaft 22 of the cargo securing buckle 10, while the other belt 2 is clamped between the belt retaining shaft 23 and the belt holder 30. In this state, the belts 2 are pulled in the left and right directions up to a maximum of 100 kgf, and a tensile test is performed.

[0050] The results of the tensile tests are shown in Figures 10 to 14. Figure 10 is a graph showing the results of the tensile test for Example 1. Figure 11 is a graph showing the results of the tensile test for Example 2. Figure 12 is a graph showing the results of the tensile test for Example 3. Figure 13 is a graph showing the results of the tensile test for Comparative Example 1. Figure 14 is a graph showing the results of the tensile test for Comparative Example 2. For Examples 1 to 3 and Comparative Example 1, each graph shows the results of three tensile tests. For Comparative Example 2, each graph shows the results of two tensile tests because a third test could not be performed due to deformation of the cargo securing buckle 10.

[0051] As can be seen from Figure 13, displacement occurs as the tensile force increases even in the commercially available genuine load securing belt of Comparative Example 1. This displacement occurs because the belt 2 slides between the belt retaining shaft 23 and the belt retainer 30. Therefore, the displacement that occurs in Comparative Example 1 of Figure 13 is within the allowable range for products currently on the market. Taking this into consideration, the test results of Examples 1 to 3 and Comparative Example 2 are examined.

[0052] As can be seen from Figure 14, in Comparative Example 2, a tensile force of 67 kgf or more could not be applied the first time, and a tensile force of 55 kgf or more could not be applied the second time, resulting in large displacement. This occurs because the securing buckle 10 is deformed, and the belt 2 can no longer be firmly clamped between the belt locking shaft 23 and the belt holder 30. From this result, it can be seen that with a configuration in which a belt insertion opening 25 is simply provided in the side frame 21, the load is concentrated at a position opposite the belt insertion opening 25 on the side frame 21 on which the belt insertion opening 25 is not formed, causing the side frame 21 to deform, resulting in a strength that does not meet the 80 kgf load capacity required for a cargo securing belt in general.

[0053] 10 and 11, in Examples 1 and 2, a pulling force of up to 100 kgf was achieved in all three tests. The displacement was also the same as that of the genuine Comparative Example 1. In other words, by attaching a metal retainer 40 that covers the belt insertion opening 25 to the side frame 21 in which the belt insertion opening 25 is formed, the strength of the cargo tie-down belt in Comparative Example 1 is similar to that of the genuine commercially available product.

[0054] 12, in Example 3, the first test was able to pull up to a tensile force of 100 kgf. In the second test, the load resistance was also able to reach 80 kgf, which is generally required of a load securing belt. Since it is rare for a load as large as 80 kgf to be applied when actually securing a load, it can be seen that the load securing belt 1 can be made sufficiently durable even by attaching a retainer 40 made of a material with a tensile strength similar to that of the polyvinyl chloride used in Example 3 that covers the belt insertion opening 25 to the side frame 21 where the belt insertion opening 25 is formed.

[0055] As described above, the cargo securing buckle 10 of the present invention has a belt insertion opening 25 formed in the side frame 21, and the side frame 21 is provided with a stopper 40 that can open and close the belt insertion opening 25. Generally, the belt 2 attached to the cargo securing belt 1 is relatively long so that it can secure even a large amount of cargo. With the cargo securing buckle 10 of the present invention, even if the cargo is small and the belt 2 is long, the middle portion of the belt 2 can be inserted through the belt insertion opening 25 and between the belt locking shaft 23 and the belt retainer 30. Conventionally, the free end 2b of the belt 2 is inserted between the belt locking shaft 23 and the belt retainer 30, and the length of the belt 2 is adjusted by passing the belt 2 between the belt locking shaft 23 and the belt retainer 30. However, with the present invention, the length of the belt 2 can be adjusted to fit the cargo before being inserted between the belt locking shaft 23 and the belt retainer 30. This allows the belt 2 to be adjusted in a shorter time than when the belt 2 is passed through a narrow space, thereby shortening the time required to secure the cargo. Furthermore, even if the belt insertion opening 25 is provided, the strength of the securing buckle 10 is sufficient because the retaining device 40 is provided to block the belt insertion opening 25. In particular, by using the retaining device 40 made of a material with a tensile strength of 41 MPa or more, more preferably a metal retaining device 40, the securing buckle 10 can have the same strength as a securing belt 1 that does not have a belt insertion opening 25.

[0056] On the other hand, when there is a lot of luggage and not much slack in the belt 2, it is also possible to insert the free end 2b of the belt 2 between the belt locking shaft 23 and the belt retainer 30 as in the conventional method without using the belt insertion port 25. When there is not much slack in the belt 2, it does not take much time to adjust the length of the belt 2 even when using it in the conventional way. In addition, when used in this way, the effort of opening and closing the belt insertion port 25 can be reduced by using the stopper 40. As a result, the cargo securing belt 1 of the present invention can be used in two ways depending on the amount of luggage, and can secure luggage in a short time regardless of the amount of luggage.

[0057] In addition, in actual work sites, users may sometimes fasten luggage while wearing gloves. At this time, it may be difficult to insert the free end 2b of the belt 2 between the belt fastening shaft 23 and the belt retainer 30. Even in such cases, the belt 2 can be inserted between the belt fastening shaft 23 and the belt retainer 30 through the belt insertion opening 25, allowing the luggage to be fastened efficiently in a short time.

[0058] Furthermore, in the cargo securing buckle 10 of the present invention, the retaining device 40 is composed of a hook 41. Opening and closing the belt insertion opening 25 with the hook 41 is a relatively simple structure, which helps keep costs down. As a result, the cargo securing belt 1 of the present invention can be sold at a price not much different from conventional products.

[0059] Furthermore, the cargo securing buckle 10 of the present invention is provided with a hook elastic member 44 that biases the hook 41 toward the side frame 21. If the gap between the through hole 412 of the hook 41 and the hook fixing shaft 42 is small, a force is required to rotate the hook 41, making it difficult to open and close the belt insertion opening 25. Conversely, if the gap between the through hole 412 of the hook 41 and the hook fixing shaft 42 is large, the hook 41 easily moves relative to the hook fixing shaft 42. When opening the belt insertion opening 25 to insert the belt 2, the hook 41 moves on its own, closing the belt insertion opening 25. If a user tries to insert the belt 2 by grasping the hook 41 to prevent this, it becomes difficult to insert the belt 2. However, by providing the hook elastic member 44 as in the cargo securing buckle 10 of the present invention, the hook 41 moves smoothly when the user opens and closes the hook 41, and the hook 41 can be held stationary when the user wants to keep the belt insertion opening 25 open. As a result, the belt 2 can be easily inserted between the belt fastening shaft 23 and the belt retainer 30 from the belt insertion opening 25 without having to worry about the hook 41, and the luggage can be secured in a shorter time.

[0060] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0061] For example, in the above embodiment, the retaining device 40 is configured with the hook 41, the hook fixing shaft 42, the hook engaging projection 43, and the hook elastic member 44, but the present invention does not necessarily have to have this configuration. For example, the retaining device 40 may be configured as a slider that is slidably attached to the side frame 21. When the retaining device 40 is configured as a slider, an elastic member for the slider may be provided that moves the slider in a direction that closes the belt insertion opening 25 when the user releases their hand from the slider. [Explanation of symbols]

[0062] 1 cargo strap 2 Belt 10. Cargo buckle 20 Main Unit 21 Side frame 22 Belt fixing shaft 23 Belt retaining shaft 25 Belt insertion slot 30 Belt holder 40 Stopper 41 Hook 42 Hook fixing shaft 43 Hook locking protrusion 44 Elastic member for hook

Claims

1. a frame-shaped main body having a pair of rod-shaped or plate-shaped side frames, a belt fixing shaft provided at one longitudinal end of the side frames so as to span the pair of side frames, and a belt locking shaft provided at the other longitudinal end of the side frames so as to span the pair of side frames; a belt holder attached to the main body so as to be movable toward or away from the belt fastening shaft, and which presses the belt against the belt fastening shaft; a stopper for preventing the belt from coming off the main body, One of the pair of side frames has a belt insertion opening through which a belt can be inserted, the opening being located along a surface where the belt fastening shaft and the belt presser contact each other, The stopper is a cargo securing buckle attached to the side frame so as to be able to open and close the belt insertion opening.

2. The stopper includes a hook, a hook fixing shaft for rotatably fixing the hook, a hook locking projection for locking the hook, and a hook elastic member for biasing the hook toward the side frame on the hook fixing shaft, 2. The cargo securing buckle according to claim 1, wherein the hook fixing shaft and the hook engaging projection are provided on the side frame with the belt insertion opening interposed therebetween.

3. 3. The cargo securing buckle according to claim 2, wherein the hook has a tensile strength of 41 MPa or more.

4. 3. The cargo securing buckle according to claim 2, wherein the hook is made of metal.

5. The cargo securing buckle according to any one of claims 1 to 4, A cargo securing belt comprising: a belt attached to the cargo securing buckle.

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