Double zipper chain

Abstract

A double zipper chain according to one embodiment of the present invention is a double zipper chain in which a first chain unit and a second chain unit are coupled to each other in a longitudinal direction. The first chain unit or the second chain unit comprises: an inner chain unit continuously disposed in the longitudinal direction; and an outer chain unit provided on the outside of the inner chain unit and having one side and the other side to which the inner chain unit is connected. The inner chain unit comprises: an inner body part forming a body and having the outer chain unit on the outside thereof; an inner protrusion part formed to protrude inward from the inner body part; an inner concave part formed to be curvedly recessed between the inner protrusion part and the inner body part and having the inner protrusion part seated thereon when the first chain unit and the second chain unit are coupled to each other; a first rod coupled to the inner protrusion part and disposed in the inner concave part when the first chain unit and the second chain unit are coupled to each other; and a second rod coupled to the inner body part and integrally coupled to the outer chain unit.

Description

double zipper chain

[0001] The present invention relates to a double zipper chain, and more specifically, to a double zipper chain that improves vertical coupling strength and supports the lateral direction, thereby enabling it to be raised and lowered to a high height in the vertical direction.

[0002] A zipper chain is a device in which a pair of chains are interconnected in a zipper shape to generate a normal resistance in the longitudinal direction.

[0003] Since these zipper chains extend in the longitudinal direction, they can vertically raise or lower objects or devices attached to their longitudinal ends, making them a product that can replace hydraulic or pneumatic cylinders and applicable to various fields in industrial settings.

[0004] FIG. 1 is a schematic diagram of a general zipper chain, FIG. 1(a) is a front view of the zipper chain, and FIG. 1(b) is a side view of the zipper chain, specifically a side view of the left chain (A). Referring to FIG. 1, a pair of zipper chains are joined together by the rotation of a drive device (D) (sprocket), and as the zipper chains are continuously joined, a weight (M) attached to the end is raised.

[0005] At this time, the zipper chain is composed of a hook-shaped left chain (A) and a right chain (B) so that they can be joined together as shown in FIG. 1(a), and the left chain (A) has left links (AL, BL) connected continuously by rollers, and likewise the right chain (B) has right links (AL, BL) connected continuously by rollers.

[0006] In addition, a recess and a groove are formed so that the left chain (A) and the right chain (B) correspond to each other, and the groove of the right chain (B) is joined to the recess of the left chain (A), so as to have a structure that is continuously joined in the longitudinal direction like a zipper.

[0007] However, in this zipper chain, the connecting line where the left chain (A) and the right chain (B) come into contact is formed in one direction, and since a component force for vertical load is generated, a problem of buckling occurs.

[0008] In addition, the thickness of each link (AL, BL) and the bonding stability are proportional to each other. If the thickness of the links (AL, BL) is thin or if there is a gap between the links (AL, BL), the bonding stability is compromised, and a problem arises where the bonding of the links (AL, BL) collapses due to the gap in the roller.

[0009] In addition, as shown in Fig. 1(b), if there is no support structure for the lateral direction, each link (AL, BL) is joined in an alternating manner in the lateral direction due to a vertical load, and a moment in the lateral direction is generated, causing the connection to collapse.

[0010] Therefore, there is a need to develop a zipper chain that improves vertical bonding strength and supports the lateral direction, enabling it to be raised and lowered to a high height in the vertical direction.

[0011] The problem that the present invention aims to solve is to provide a double zipper chain that can be raised and lowered in the vertical direction by improving the bonding force in the vertical direction and supporting the lateral direction.

[0012] A double zipper chain according to an embodiment of the present invention for solving the above problem comprises, in a double zipper chain in which a first chain unit and a second chain unit are mutually coupled in the longitudinal direction, wherein the first chain unit or the second chain unit comprises: an inner chain unit continuously arranged in the longitudinal direction; and an outer chain unit provided on the outer side of the inner chain unit, to which the inner chain unit is connected on one side and the other side; wherein the inner chain unit comprises: an inner body portion forming a body and having the outer chain unit provided on the outer side; an inner protrusion formed by protruding inwardly from the inner body portion; an inner concave portion formed by being curvedly recessed between the inner protrusion portion and the inner body portion, wherein the inner protrusion is seated when the first chain unit and the second chain unit are mutually coupled; and a first rod coupled to the inner protrusion portion and disposed in the inner concave portion when the first chain unit and the second chain unit are mutually coupled. and a second rod coupled to the inner body part and integrally coupled to the outer chain unit; is included.

[0013] Additionally, the outer chain unit comprises: an outer body portion that forms a body and is provided with the inner body portion on the inside; an outer protrusion portion formed by protruding inwardly from the outer body portion; an outer concave portion formed by being curvedly recessed between the outer protrusion portion and the outer body portion, on which the outer protrusion portion is seated when the first chain unit and the second chain unit are mutually coupled; a third rod coupled to the outer protrusion portion, disposed in the outer concave portion when the first chain unit and the second chain unit are mutually coupled, and stacked on the first rod; and an outer shielding portion formed on the opposite side of the outer concave portion, formed by filling the space between the outer body portion and the outer protrusion portion.

[0014] In addition, the second rod is joined by integrally penetrating the inner body part and the outer body part.

[0015] In addition, the inner concave portion is formed symmetrically with respect to the centerline of the inner protrusion portion and the inner body portion.

[0016] In addition, based on the centerline of the outer protrusion and the outer body part, the outer concave part is formed on one side of the centerline, and the outer shielding part is formed asymmetrically on the other side of the centerline.

[0017] In addition, the outer shielding portion is formed to extend radially in a curved manner from the connection point of the third rod to the connection point of the second rod.

[0018] Additionally, when the first chain unit and the second chain unit are combined, the inner protrusion of the first chain unit is seated in the inner concave portion of the second chain unit to form a connection line, and the first rod of the first chain unit is laminated onto the first rod of the second chain unit.

[0019] Additionally, when the first chain unit and the second chain unit are combined, the outer protrusion of the first chain unit is seated on the outer concave portion of the second chain unit, and the third rod of the first chain unit is stacked on the third rod of the second chain unit.

[0020] Additionally, when the first chain unit and the second chain unit are coupled together, the outer shielding portion of the first chain unit comes into contact with the outer shielding portion of the second chain unit, and the outer shielding portion shields the coupling line from the outside to support the outer side of the inner protrusion and the inner concave portion.

[0021] In addition, the outer shielding portion shields the inner concave portion of the first chain unit and the inner protruding portion of the second chain unit.

[0022] According to a double zipper chain according to one embodiment of the present invention, the bonding force in the vertical direction is improved, and by supporting the lateral direction, it becomes possible to raise and lower it to a high height in the vertical direction.

[0023] Figure 1 is a schematic diagram of a typical zipper chain.

[0024] FIG. 2 is a perspective view of a double zipper chain according to one embodiment of the present invention.

[0025] FIG. 3 is a front view of a double zipper chain according to one embodiment of the present invention.

[0026] FIGS. 4 and 5 are perspective views of an inner chain unit (11, 21) and an outer chain unit (12, 22) according to an embodiment of the present invention.

[0027] FIGS. 6 and 7 are exploded perspective views of an inner chain unit (11, 21) and an outer chain unit (12, 22) according to an embodiment of the present invention.

[0028] FIG. 8 is an exploded perspective view of an inner chain unit (11, 21) according to one embodiment of the present invention.

[0029] FIG. 9 is an exploded perspective view of an outer chain unit (12, 22) according to one embodiment of the present invention.

[0030] FIG. 10 is a plan view in which the inner chain unit (11, 21) of the first chain unit (10) and the inner chain unit (11, 21) of the second chain unit (20) are combined according to one embodiment of the present invention.

[0031] FIG. 11 is a plan view in which the outer chain unit (12, 22) of the second chain unit (20) is combined with FIG. 10.

[0032] FIG. 12 is a plan view in which the outer chain unit (12, 22) of the first chain unit (10) is combined with FIG. 11.

[0033] FIG. 13 is a plan view in which the first chain unit (10) and the second chain unit (20) are connected in succession.

[0034] FIG. 14 is a plan view showing that the outer shielding part (124, 224) shields the connecting line (C) according to one embodiment of the present invention.

[0035] FIG. 15 is a side view illustrating that the outer chain unit (12, 22) supports the inner chain unit (11, 21) to support the lateral direction.

[0036] FIG. 16 is a schematic diagram illustrating that an inner chain unit (11, 21) and an outer chain unit (12, 22) are combined to form a truss structure according to one embodiment of the present invention.

[0037] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0038] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Identical reference numerals in each drawing indicate identical components.

[0039] Hereinafter, a double zipper chain according to an embodiment of the present invention will be described with reference to FIGS. 2 to 9.

[0040] FIG. 2 is a perspective view of a double zipper chain according to one embodiment of the present invention.

[0041] FIG. 3 is a front view of a double zipper chain according to one embodiment of the present invention.

[0042] FIGS. 4 and 5 are perspective views of an inner chain unit (11, 21) and an outer chain unit (12, 22) according to an embodiment of the present invention.

[0043] FIGS. 6 and 7 are exploded perspective views of an inner chain unit (11, 21) and an outer chain unit (12, 22) according to an embodiment of the present invention.

[0044] FIG. 8 is an exploded perspective view of an inner chain unit (11, 21) according to one embodiment of the present invention.

[0045] FIG. 9 is an exploded perspective view of an outer chain unit (12, 22) according to one embodiment of the present invention.

[0046] Referring to FIGS. 2 to 9, a double zipper chain according to one embodiment of the present invention has a first chain unit (10) and a second chain unit (20) joined together in the longitudinal direction.

[0047] FIG. 2 illustrates a first chain unit (10) and a second chain unit (20) being combined and arranged in a vertical direction. The Z-axis direction shown in FIG. 2 is defined as the vertical direction, and the Y-axis direction as the lateral direction. In this case, the length direction can be implemented in the same way as the vertical direction.

[0048] In the following description, the first chain unit (10) and the second chain unit (20) are described as being combined and arranged in a vertical direction, but the direction in which the first chain unit (10) and the second chain unit (20) are arranged is not limited.

[0049] The first chain unit (10) is formed to extend in the longitudinal direction. The first chain unit (10) can be raised or lowered in the vertical direction by the rotation of a driving device (D) as shown in FIG. 1.

[0050] The second chain unit (20) has the same shape as the first chain unit (10). The second chain unit (20) is positioned symmetrically to the first chain unit (10).

[0051] The second chain unit (20) can be raised or lowered in a vertical direction by the rotation of the drive device (D) as shown in FIG. 1. Since the second chain unit (20) is identical to the first chain unit (10), a detailed description is omitted below, and only the differences are described.

[0052] When the drive unit (D) is rotated, the first chain unit (10) and the second chain unit (20) are coupled by interlocking with each other. At this time, as the first chain unit (10) and the second chain unit (20) are continuously coupled, the weight (M) coupled to the end is raised.

[0053] Meanwhile, when the driving device (D) is rotated in the opposite direction, the connection between the first chain unit (10) and the second chain unit (20) is released. At this time, as the connection between the first chain unit (10) and the second chain unit (20) is continuously released, the weight (M) connected to the end is lowered.

[0054] Accordingly, the first chain unit (10) and the second chain unit (20) are combined to raise or lower the weight (M) attached to the end.

[0055] Here, the first chain unit (10) or the second chain unit (20) comprises: an inner chain unit (11, 21) arranged continuously in the longitudinal direction; and an outer chain unit (12, 22) provided on the outer side of the inner chain unit (11, 21), to which the inner chain unit (11, 21) is coupled on one side and the other side.

[0056] As described above, since the first chain unit (10) and the second chain unit (20) are identical, the first chain unit (10) will be described below, and the description of the second chain unit (20) will be replaced by the description of the first chain unit (10).

[0057] The inner chain units (11, 21) are arranged continuously in the longitudinal direction. The inner chain units (11, 21) are connected to the outer chain units (12, 22).

[0058] The outer chain unit (12, 22) is provided on the outer side of the inner chain unit (11, 21). In this case, the outer chain unit (12, 22) is provided in the Y-axis direction of the inner chain unit (11, 21) with respect to FIG. 4.

[0059] Inner chain units (11, 21) are connected to one side and the other side of outer chain units (12, 22). In this case, the first chain unit (10) is arranged continuously in the longitudinal direction in the order of outer chain units (12, 22), inner chain units (11, 21), outer chain units (12, 22), and inner chain units (11, 21).

[0060] Here, according to one embodiment of the present invention, the inner chain unit (11, 21) comprises: an inner body portion (111, 211) that forms a body and has the outer chain unit (12, 22) provided on the outer side; an inner protrusion portion (113, 213) formed to protrude inwardly from the inner body portion (111, 211); and an inner concave portion (112, 212) formed to be curvedly recessed between the inner protrusion portion (113, 213) and the inner body portion (111, 211), on which the inner protrusion portion (113, 213) is seated when the first chain unit (10) and the second chain unit (20) are mutually coupled. It includes: a first rod (115, 215) coupled to the inner protrusion (113, 213) and disposed in the inner concave portion (112, 212) when the first chain unit (10) and the second chain unit (20) are coupled to each other; and a second rod (116, 216) coupled to the inner body portion (111, 211) and integrally coupled with the outer chain unit (12, 22).

[0061] The inner body portions (111, 211) form a body. An outer chain unit (12, 22) is provided on the outer side of the inner body portions (111, 211). The inner body portions (111, 211) may be provided as a pair.

[0062] The inner protrusion (113, 213) is formed by protruding inwardly from the inner body part (111, 211). Here, the inner protrusion (113, 213) is formed by protruding in the X-axis direction as shown in FIG. 6. The inner protrusion (113, 213) is formed as a curved surface with a curved end.

[0063] The inner concave portion (112, 212) is formed curved between the inner protrusion portion (113, 213) and the inner body portion (111, 211). The inner concave portion (112, 212) is formed by being sunken. The inner concave portion (112, 212) is formed by being sunken in a shape corresponding to the inner protrusion portion (113, 213). When the first chain unit (10) and the second chain unit (20) are coupled together, the inner protrusion portion (113, 213) is seated in the inner concave portion (112, 212). In this case, the inner protrusion portion (113, 213) is mutually supported by the inner concave portion (112, 212).

[0064] The first rod (115, 215) is coupled to the inner protrusion (113, 213). A pair of inner body parts (111, 211) are provided, and the first rod (115, 215) is coupled to the inner protrusion (113, 213) to combine the pair of inner body parts (111, 211). The first rod (115, 215) is rotatably coupled to the inner protrusion (113, 213).

[0065] When the first chain unit (10) and the second chain unit (20) are combined, the first rod (115, 215) is placed in the inner concave portion (112, 212). In this case, the first rod (115, 215) of the first chain unit (10) is stacked on the first rod (115, 215) of the second chain unit (20).

[0066] The second rod (116, 216) is coupled to the inner body portion (111, 211). The inner body portion (111, 211) is provided as a pair, and the second rod (116, 216) is coupled to the inner body portion (111, 211) to combine the pair of inner body portions (111, 211). The second rod (116, 216) is rotatably coupled to the inner body portion (111, 211).

[0067] The second rod (116, 216) is integrally combined with the outer chain unit (12, 22). Accordingly, the inner chain unit (11, 21) and the outer chain unit (12, 22) can be connected along the longitudinal direction by the second rod (116, 216).

[0068] Here, according to one embodiment of the present invention, the outer chain unit (12, 22) comprises: an outer body part (121, 221) that forms a body and has an inner body part (111, 211) provided on the inside; an outer protrusion part (123, 223) formed to protrude inwardly from the outer body part (121, 221); and an outer concave part (122, 222) formed to be curvedly recessed between the outer protrusion part (123, 223) and the outer body part (121, 221), on which the outer protrusion part (123, 223) is seated when the first chain unit (10) and the second chain unit (20) are mutually coupled. It includes: a third rod (125, 225) coupled to the outer protrusion (123, 223), disposed in the outer concave portion (122, 222) when the first chain unit (10) and the second chain unit (20) are coupled to each other, and stacked on the first rod (115, 215); and an outer shielding portion (124, 224) formed on the opposite side of the outer concave portion (122, 222) and formed by filling the space between the outer body portion (121, 221) and the outer protrusion (123, 223).

[0069] The outer body portions (121, 221) form a body. An inner chain unit (11, 21) is provided on the inner side of the outer body portions (121, 221). An inner body portion (111, 211) is provided on the inner side of the outer body portions (121, 221). The outer body portions (121, 221) may be provided as a pair.

[0070] The outer protrusion (123, 223) is formed to protrude inwardly from the outer body part (121, 221). Here, the outer protrusion (123, 223) is formed to protrude in the X-axis direction as shown in FIG. 6. The outer protrusion (123, 223) is formed as a curved surface with a curved end.

[0071] The outer concave portion (122, 222) is formed curved between the outer protrusion (123, 223) and the outer body portion (121, 221). The outer concave portion (122, 222) is formed by being sunken. The outer concave portion (122, 222) is formed by being sunken in a shape corresponding to the outer protrusion (123, 223). When the first chain unit (10) and the second chain unit (20) are coupled together, the outer protrusion (123, 223) is seated on the outer concave portion (122, 222). In this case, the outer protrusion (123, 223) is mutually supported by the outer concave portion (122, 222).

[0072] The third rod (125, 225) is coupled to the outer protrusion (123, 223). A pair of outer body parts (121, 221) are provided, and the third rod (125, 225) is coupled to the outer protrusion (123, 223) to combine the pair of outer body parts (121, 221). The third rod (125, 225) is rotatably coupled to the outer protrusion (123, 223).

[0073] When the first chain unit (10) and the second chain unit (20) are combined, the third rod (125, 225) is placed in the outer concave portion (122, 222). At this time, the third rod (125, 225) of the first chain unit (10) may have the third rod (125, 225) of the second chain unit (20) placed on the upper side and the first rod (115, 215) of the second chain unit (20) stacked on the lower side.

[0074] The outer shielding portion (124, 224) is formed on the opposite side of the outer concave portion (122, 222). The outer shielding portion (124, 224) is formed by filling the space between the outer body portion (121, 221) and the outer protrusion portion (123, 223). The outer shielding portion (124, 224) is formed to extend outward by filling the empty space between the outer body portion (121, 221) and the outer protrusion portion (123, 223).

[0075] The second rod (116, 216) is integrally connected to the inner body part (111, 211) and the outer body part (121, 221). The inner body part (111, 211) is provided on the inner side of the outer body part (121, 221), and the second rod (116, 216) integrally penetrates the inner body part (111, 211) and the outer body part (121, 221) to connect the inner body part (111, 211) and the outer body part (121, 221). Accordingly, the outer chain unit (12, 22), inner chain unit (11, 21), outer chain unit (12, 22), and inner chain unit (11, 21) can be arranged continuously along the longitudinal direction.

[0076] Hereinafter, an inner chain unit (11, 21) according to an embodiment of the present invention will be described in detail with reference to FIG. 8.

[0077] FIG. 8 is a perspective view of an inner chain unit (11, 21) according to one embodiment of the present invention.

[0078] Referring to FIG. 8, the inner concave portion (112, 212) according to one embodiment of the present invention is formed symmetrically with respect to the centerline (L) of the inner protrusion portion (113, 213) and the inner body portion (111, 211).

[0079] That is, as shown in FIG. 8, the inner concave portion (112, 212) is formed symmetrically with respect to the center line (L) connecting the center of the inner protrusion portion (113, 213) and the inner body portion (111, 211). At this time, the inner protrusion portion (113, 213) is formed to protrude in a circular shape, and the inner concave portion (112, 212) can be formed to be sunken in a circular shape corresponding to the inner protrusion portion (113, 213).

[0080] In this case, as described below, when the first chain unit (10) and the second chain unit (20) are combined, the inner protrusions (113, 213) of the first chain unit (10) are seated on the inner concave portions (112, 212) of the second chain unit (20) to form a connecting line (C).

[0081] A guide roller (G) may be provided on the outer side of the second rod (116, 216). A guide roller (G) may be provided on the outer side of the outer body part (121, 221). The guide roller (G) guides the second rod (116, 216) so that it can rotate on the outer body part (121, 221). A snap ring (S) is attached to the guide roller (G) to prevent the guide roller (G) from detaching from the second rod (116, 216).

[0082] An outer chain unit (12, 22) according to an embodiment of the present invention will be described in detail below with reference to FIG. 9.

[0083] FIG. 9 is a perspective view of an outer chain unit (12, 22) according to one embodiment of the present invention.

[0084] Referring to FIG. 9, the outer chain unit (12, 22) according to one embodiment of the present invention is formed with an opening in a rod coupling hole (H) to which the second rod (116, 216) is coupled. In this case, the second rod (116, 216) is coupled to the rod coupling hole (H) to connect the inner body part (111, 211) and the outer body part (121, 221).

[0085] Here, according to one embodiment of the present invention, the outer concave portion (122, 222) and the outer shielding portion (124, 224) are formed asymmetrically. That is, based on the centerline (L) of the outer protrusion portion (123, 223) and the outer body portion (121, 221), the outer concave portion (122, 222) is formed on one side of the centerline (L), and the outer shielding portion (124, 224) is formed asymmetrically on the other side of the centerline (L).

[0086] At this time, the outer shielding portion (124, 224) is formed to extend radially in a curved manner from the connection point of the third rod (125, 225) to the connection point of the second rod (116, 216). In this case, the connection point of the second rod (116, 216) can be implemented as a rod connection hole (H). As described above, the outer shielding portion (124, 224) is formed by filling the recessed part formed by the outer concave portion (122, 222) with flesh, extending radially, and being formed in a curved manner.

[0087] With reference to FIGS. 10 to 15, the connection relationship of a double zipper chain according to one embodiment of the present invention will be described below.

[0088] FIG. 10 is a plan view in which the inner chain unit (11, 21) of the first chain unit (10) and the inner chain unit (11, 21) of the second chain unit (20) are combined according to one embodiment of the present invention.

[0089] FIG. 11 is a plan view in which the outer chain unit (12, 22) of the second chain unit (20) is combined with FIG. 10.

[0090] FIG. 12 is a plan view in which the outer chain unit (12, 22) of the first chain unit (10) is combined with FIG. 11.

[0091] FIG. 13 is a plan view in which the first chain unit (10) and the second chain unit (20) are connected in succession.

[0092] FIG. 14 is a plan view showing that the outer shielding part (124, 224) shields the connecting line (C) according to one embodiment of the present invention.

[0093] FIG. 15 is a side view illustrating that the outer chain unit (12, 22) supports the inner chain unit (11, 21) to support the lateral direction.

[0094] FIG. 16 is a schematic diagram illustrating that an inner chain unit (11, 21) and an outer chain unit (12, 22) are combined to form a truss structure according to one embodiment of the present invention.

[0095] Referring to FIG. 10, when the first chain unit (10) and the second chain unit (20) are combined, the inner protrusion (113) of the first chain unit (10) is seated in the inner concave portion (212) of the second chain unit (20).

[0096] That is, as illustrated in FIG. 10, the first chain unit (10) and the second chain unit (20) are combined with each other, and at this time, the inner protrusion (113) of the first chain unit (10) positioned on the left is seated in the inner concave portion (212) of the second chain unit (20) positioned on the right.

[0097] In this case, the inner protrusion (113) and the inner concave portion (212) are firmly zippered together so that they can support a load applied in the vertical direction.

[0098] At this time, the inner protrusion (113) is seated in the inner concave portion (212) and formed by creating a clearance, thereby forming a joint line (C). The joint line (C) is the part indicated by a thick line in FIG. 10, and can be formed up to a part of the inner body portion (111), the inner concave portion (112), and a part of the inner protrusion (113) based on the first chain unit (10).

[0099] In addition, as illustrated in FIG. 10, the first rod (115) of the first chain unit (10) is stacked on the first rod (215) of the second chain unit (20). At this time, it can be stacked in a vertical direction. Here, the vertical direction can be implemented in the longitudinal direction.

[0100] In this case, the first rod (115) of the first chain unit (10) and the first rod (215) of the second chain unit (20) can firmly support the load applied in the vertical direction.

[0101] According to the embodiment, when the load of the above-described heavy object (M) is small or non-existent, the tolerance formed in the connecting line (C) can absorb impact in the vertical direction. In this case, the first rod (115) of the first chain unit (10) can come into contact with the first rod (215) of the second chain unit (20) to support the load.

[0102] In addition, when the load of the heavy object (M) is large, a vertical load is applied as shown in FIG. 10. At this time, the inner protrusions (113, 213) can be elastically deformed in the horizontal direction.

[0103] In this case, the inner protrusion (113) of the first chain unit (10) is stretched by elastic deformation by the tolerance and can come into contact with the inner concave portion (212) of the second chain unit (20). At this time, the first rods (115, 215) stacked in the vertical direction come into surface contact with each other, generating a supporting force against high loads.

[0104] Accordingly, the inner chain unit (11, 21) can firmly support the load of the heavy object (M) applied in the vertical direction.

[0105] Referring to FIG. 11, when the first chain unit (10) and the second chain unit (20) are combined, the outer protrusion (223) of the second chain unit (20) is positioned in the inner concave portion (112) of the first chain unit (10).

[0106] That is, as shown in FIG. 11, the first chain unit (10) and the second chain unit (20) are combined with each other, and the outer protrusion (223) of the second chain unit (20) is placed in the inner concave portion (112) of the first chain unit (10).

[0107] At this time, as shown in FIG. 11, the third rod (225) of the second chain unit (20) is stacked on the first rod (115) of the first chain unit (10). At this time, it can be stacked in a vertical direction.

[0108] In this case, the first rod (215) of the second chain unit (20), the first rod (115) of the first chain unit (10), and the third rod (225) of the second chain unit (20) can be zipper-connected to form a trussed structure. Accordingly, it is possible to firmly support a load applied in the vertical direction.

[0109] Referring to FIG. 12, when the first chain unit (10) and the second chain unit (20) are combined, the outer protrusion (123) of the first chain unit (10) is seated in the outer concave portion (222) of the second chain unit (20).

[0110] That is, as shown in FIG. 12, the first chain unit (10) and the second chain unit (20) are combined with each other, and the outer protrusion (123) of the first chain unit (10) is seated in the outer concave portion (222) of the second chain unit (20).

[0111] In this case, the outer protrusion (123, 223) and the outer concave (122, 222) are firmly zippered together and zippered separately from the inner chain unit (11, 21), so that they are double zippered together, thereby enabling them to support a load applied in the vertical direction.

[0112] Additionally, as illustrated in FIG. 12, when the first chain unit (10) and the second chain unit (20) are combined, the third rod (125) of the first chain unit (10) is placed in the outer recess (222) of the second chain unit (20). In this case, the third rod (125) of the first chain unit (10) is stacked on the third rod (225) of the second chain unit (20). At this time, they can be stacked in a vertical direction.

[0113] Accordingly, as shown in FIG. 13, the first chain unit (10) and the second chain unit (20) can be continuously combined.

[0114] In this case, the first rod (215) of the second chain unit (20), the first rod (115) of the first chain unit (10), the third rod (225) of the second chain unit (20), and the third rod (125) of the first chain unit can be zipper-connected to form a truss structure. Accordingly, it is possible to firmly support a load applied in the vertical direction.

[0115] In addition, the inner chain units (11, 21) of the first chain unit (10) and the second chain unit (20) are zipper-connected, and the outer chain units (12, 22) of the first chain unit (10) and the second chain unit (20) are zipper-connected, so that they are double zipper-connected, thereby supporting the load and preventing buckling.

[0116] At this time, when the first chain unit (10) and the second chain unit (20) are combined, as shown in FIG. 13, the outer shielding part (124) of the first chain unit (10) comes into contact with the outer shielding part (224) of the second chain unit (20). In this case, surface contact may occur.

[0117] That is, as shown in FIG. 13, the outer shielding part (224) of the second chain unit (20) is in contact with the outer shielding part (124) of the first chain unit (10) and is mutually supported. Accordingly, it is possible to provide double support for the load component.

[0118] Referring to FIG. 14, the outer shielding portion (124, 224) according to one embodiment of the present invention shields the connecting line (C) from the outside and supports the outer side of the inner protrusion (113, 213) and the inner concave portion (112, 212).

[0119] That is, the outer shielding portion (124, 224) is a part formed by extending outward and protruding in a curved manner as described above, and shields the connecting line (C) from the outside as shown in FIG. 14.

[0120] As shown in FIG. 1(b), when the first zipper chain and the second zipper chain are joined in a long vertical direction, the joining line (C) forms a tolerance, so the tolerances accumulate due to the load of the heavy object (M) and can be joined in a mutually offset manner in the lateral direction.

[0121] At this time, the outer shielding part (124) of the present invention illustrated in FIG. 14 shields the connecting line (C) from the outside, and each outer shielding part (124, 224) is supported by contacting each other. Accordingly, it is possible to prevent the generation of a bending moment by preventing the connection from being misaligned in the lateral direction due to the accumulation of tolerances.

[0122] At this time, the outer shielding part (124) shields the inner concave part (112) of the first chain unit (10) and the inner protruding part (213) of the second chain unit (20).

[0123] That is, as shown in FIG. 14, a connecting line (C) is formed at the part where the inner concave portion (112) of the first chain unit (10) and the inner protruding portion (213) of the second chain unit (20) are joined, and the outer shielding portion (124) of the present invention shields the connecting line (C) formed by shielding the inner concave portion (112) of the first chain unit (10) and the inner protruding portion (213) of the second chain unit (20).

[0124] Accordingly, as shown in FIG. 15, the outer shielding part (124) shields the connecting line (C), and the inner chain unit (11, 21) and the outer chain unit (12, 22) are connected to each other in the vertical direction, thereby preventing misalignment in the lateral direction and preventing the occurrence of a bending moment.

[0125] In addition, as shown in FIG. 16, the first chain unit (10) and the second chain unit (20) are zipper-connected to form a truss structure, which firmly supports the load applied in the vertical direction and supports the component force, thereby preventing buckling.

[0126] For the time being, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without altering its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive.

[0127] The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention.

[0128] The present invention is a product capable of replacing hydraulic or pneumatic cylinders and can be applied to lifts for raising and lowering heavy objects, elevators, logistics centers, automotive logistics, machinery, and steel industry sites.

Claims

1. In a double zipper chain in which a first chain unit and a second chain unit are coupled to each other in the longitudinal direction, The above-mentioned first chain unit or the above-mentioned second chain unit is, Inner chain units arranged continuously in the longitudinal direction; and An outer chain unit provided on the outer side of the inner chain unit, with the inner chain unit connected to one side and the other side; comprising The above inner chain unit is, An inner body part that forms a body and is provided with the outer chain unit on the outer side; An inner protrusion formed by protruding inwardly in the inner body portion; An inner concave portion formed by a curved depression between the inner protrusion and the inner body portion, wherein the inner protrusion is seated when the first chain unit and the second chain unit are coupled together; A first rod coupled to the inner protrusion and disposed in the inner recess when the first chain unit and the second chain unit are coupled to each other; and A second rod coupled to the inner body portion and integrally coupled to the outer chain unit; A double zipper chain including 2. In Paragraph 1, The above outer chain unit is, An outer body part that forms a body and is provided with the inner body part on the inside; An outer protrusion formed by protruding inwardly from the outer body portion; An outer concave portion formed by a curved depression between the outer protrusion and the outer body portion, wherein the outer protrusion is seated when the first chain unit and the second chain unit are coupled together; A third rod coupled to the outer protrusion, disposed in the outer concave portion when the first chain unit and the second chain unit are coupled to each other, and stacked on the first rod; and An outer shielding portion formed on the opposite side of the outer concave portion and formed by filling the space between the outer body portion and the outer protrusion portion; A double zipper chain including 3. In Paragraph 2, The second rod is a double zipper chain that is integrally connected by penetrating the inner body part and the outer body part.

4. In Paragraph 2, The inner concave portion is a double zipper chain formed symmetrically with respect to the centerline of the inner protrusion portion and the inner body portion.

5. In Paragraph 2, A double zipper chain formed asymmetrically on the other side of the center line of the outer protrusion and the outer body part, wherein the outer concave part is formed on one side of the center line and the outer shielding part is formed on the other side of the center line.

6. In Paragraph 5, The above outer shielding portion is a double zipper chain formed by extending radially in a curved manner from the joining point of the third rod to the joining point of the second rod.

7. In Paragraph 2, When the first chain unit and the second chain unit are combined, The inner protrusion of the first chain unit is seated in the inner concave portion of the second chain unit to form a connection line, and The first rod of the first chain unit is a double zipper chain that is laminated to the first rod of the second chain unit.

8. In Paragraph 7, When the first chain unit and the second chain unit are combined, The outer protrusion of the first chain unit is seated on the outer concave portion of the second chain unit, and The third rod of the first chain unit is a double zipper chain that is laminated to the third rod of the second chain unit.

9. In Paragraph 8, When the first chain unit and the second chain unit are combined, The outer shielding portion of the first chain unit is in contact with the outer shielding portion of the second chain unit, and The above outer shielding portion is a double zipper chain that shields the connecting line from the outside to support the outer side of the inner protrusion and the inner concave portion.

10. In Paragraph 9, The above outer shielding portion is a double zipper chain that shields the inner concave portion of the first chain unit and the inner protruding portion of the second chain unit.

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