Pulley device

Abstract

To provide a pulley device capable of performing arm stretching exercise.SOLUTION: A pulley device includes: a loop string including a ring-shaped loop portion formed in an upper portion and first and second string extension portions extending downward; a loop fixing stopper through which the first and second string extension portions pass and to which a loop portion can be connected to form a knot; and a pulley to which the first and second string extension portions are connected and which includes a pulley wheel.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a pulley device, and more particularly to a pulley device that can be used by connecting a pulley to a support base using a loop string.

Background Art

[0002] A pulley is a device that moves an object by hanging a rope or the like on a pulley wheel. A pulley is mainly used to change the direction of the action of a force.

[0003] A known pulley includes a pulley wheel and a pulley housing that rotatably supports the pulley wheel. The pulley fixes the pulley housing to a support and uses it by hanging a cable or the like on the pulley wheel.

[0004] A known pulley is provided with a metal hook, a ring, a hanger, etc. on the pulley housing to fix the pulley to a support, or is provided with a bracket for fixing through bolt fastening to the support. Such a known pulley structure has the disadvantage that the work of fixing the pulley to a support in order to use the pulley is troublesome.

[0005] For example, when fixing a pulley to a support for the purpose of lifting an object using a pulley, it is difficult to use if there is no support adjacent to which a hook or the like can be fastened.

[0006] In recent years, pulleys have also been used as exercise equipment for rehabilitation treatment. For example, Korean Utility Model Publication No. 20-1999-0001642 discloses an exercise device using a pulley. By the way, such a known pulley exercise device has a problem that the pulley must be fixed to a fixed surface of the ceiling using bolts.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] An object of the present invention is to provide a pulley device that can easily connect a pulley to a support base using a loop string and can easily adjust the position of the pulley.

[0009] Another object of the present invention is to provide a pulley device that allows the stretching movement of the arm.

Means for Solving the Problems

[0010] A pulley device according to an embodiment of the present invention includes a loop string, a pulley, and a loop fixing stopper. The loop string includes an annular loop portion formed on one side and first and second string extension portions extending to the other side on both strands of the loop portion. When the loop string is hung on a support base located on the upper side, the loop portion extends downward together with the first and second string extension portions. The loop fixing stopper includes a row of first and second through holes through which the first and second string extension portions penetrate, and a knot can be formed by hanging the loop portion that has been redirected downward by the support base on the back surface to fix the loop string. The pulley includes a pulley wheel rotatably attached by a coupling shaft between a pulley housing to which the ends of the first and second string extension portions are coupled and both-side coupling plates of the pulley housing. A groove is formed on the circumference of the pulley wheel through which a moving string can turn and pass.

[0011] According to an embodiment of the present invention, the row of first and second through holes of the loop fixing stopper includes upper through holes that allow the first and second string extension portions to extend from the back surface to the front surface, and lower through holes that allow the first and second string extension portions to extend from the front surface to the back surface.

[0012] According to an embodiment of the present invention, the loop fixing stopper includes a main plate in which the columns of the first and second through holes are formed, and both side walls protruding rearward from both sides of the main plate. The both side walls allow a loop portion hung between the rear surface of the main plate and the first and second string extension portions to extend between the both side walls. Thereby, the loop portion interferes with the first and second string extension portions to firmly fix the loop string.

[0013] According to an embodiment of the present invention, the pulley housing includes a string coupling portion formed by through holes in the upper surface through which each end of the first and second string extension portions extends. Each end of the first and second string extension portions inserted through the string coupling portion is fixed so as to be prevented from coming off from a coupling space formed in the upper part inside the pulley housing.

[0014] According to an embodiment of the present invention, it includes a moving string having both side moving string extension portions that are hung on the groove of the pulley wheel and extend downward, and a handle coupled to each lower portion of the moving string extension portions, and a stretching movement of the arm is formed to be possible.

[0015] According to an embodiment of the present invention, a hollow is formed in the handle through which the moving string extension portion is inserted and passes, and the moving string extension portion is provided with a string stopper that connects the handle and enables adjustment of the height of the handle. Inside the main body of the string stopper, a path of an insertion hole and a path of a fixing hole are formed.

Advantages of the Invention

[0016] According to the pulley device according to the present invention, the pulley can be easily connected to the support base using the loop string and the loop string stopper. Further, in a state where the pulley is suspended in the air using the loop string on a support base located at the upper part, the height at which the pulley is suspended in the air can be easily adjusted by moving the loop fixing stopper.

[0017] The pulley device according to the present invention can be used not only for lifting objects or towing objects, but also as an arm stretching exercise device for rehabilitation treatment and the like.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0019] Hereinafter, with reference to the accompanying drawings, specific details for implementing the present invention will be described. When explaining the present invention, for well-known functions involved, if it is determined that it is obvious to those skilled in the art and may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

[0020] FIG. 1 shows a pulley device according to an embodiment of the present invention, FIG. 2 shows an example of the use of the pulley device according to an embodiment of the present invention, showing a form in which the pulley device is connected to a support base, and FIG. 3 shows a form in which a loop string is coupled to a pulley housing in the pulley device according to an embodiment of the present invention.

[0021] Referring to the drawings, the pulley device according to the present invention includes a loop string 100, a loop fixing stopper 200, and a pulley 300.

[0022] According to an embodiment of the present invention, the pulley 300 is connected to a rod-shaped support base 10 via the loop string 100 and suspended in the air. The support base 10 includes various structures such as a straight rod and a bracket fixed to a wall body that can support the loop string 100.

[0023] The loop string 100 includes an annular loop portion 110 formed on one side, and first and second string extension portions 120, 121 that extend to the other side in a form branched into two strands at the loop portion 110. The loop string 100 may be hung in a manner of being passed over the support base located above, and the loop portion 110 is connected so as to be pulled downward to form a knot that fixes the loop string 100 to the support base 10 at the loop fixing stopper 200.

[0024] The ends 125 of the first and second string extensions 120, 121 are fixed to the pulley 300. As used herein, the loop string 100 means a string having an annular loop portion 110 in the middle portion, the folded portion where a loop is formed by a single string becomes the loop portion 110, and the portions branched from the loop portion 110 and extending in two strands become the first and second string extensions 120, 121. The string in this specification is used as a concept including all strings, ropes, cables, etc., and those similar thereto.

[0025] The pulley 300 includes a pulley wheel 310 and a pulley housing 320.

[0026] The pulley housing 320 includes two coupling plates 322 facing each other, and the pulley wheel 310 is disposed between the two coupling plates 322 and is rotatably supported by a coupling shaft 328.

[0027] On the upper surface of the pulley housing 320, a string coupling portion 325 to which the ends 125 on both sides of the loop string 100 are fixed is formed. The string coupling portion 325 may be formed by through holes through which the first and second string extensions 120, 121 respectively pass through.

[0028] The ends 125 on both sides of the loop string 100, that is, the ends 125 of the first and second string extensions 120, 121 enter the inside of the pulley housing 320 through the string coupling portion 325 and are fixed. The ends 125 of the loop string 100 may be tied inside the pulley housing 320 to form knots, or fixtures may be coupled and fixed. Thereby, the loop string 100 may be coupled so as not to be detached from the pulley housing 320.

[0029] At the upper part inside the pulley housing 320, a coupling space 324 is formed between the upper end of the pulley housing 320 where the pulley wheel 310 and the string coupling part 325 are formed and a knot or fixture formed at the end 125 of the loop string 100 so as not to interfere with the rotation of the pulley wheel 310.

[0030] A groove 312 through which the moving string 400 turns circumferentially is formed in the pulley wheel 310. The moving string 400 is hung on the groove 312 and its direction is changed. When the moving string 400 is pulled to one side or the other side, the pulley wheel 310 rotates as the moving string 400 moves. The string connected to the pulley wheel 310 operates together with the pulley wheel 310, so it is referred to as the moving string.

[0031] The loop fixing stopper 200 is movably coupled to the first and second string extension parts 120, 121 of the loop string 100.

[0032] The loop string 100 is passed over and hung on the support base 10 while its direction is changed, whereby it extends downward together with the loop part 110 and the first and second string extension parts 120, 121. The loop part 110 pulled by the position of the loop fixing stopper 200 is hung on the loop fixing stopper 200 and contacts the first and second string extension parts 120, 121 to form a knot for fixing the loop string 100. When the loop fixing stopper 200 is moved along the first and second string extension parts 120, 121, the position of the pulley 300 fixed to the first and second string extension parts 120, 121, that is, the height, is adjusted.

[0033] Figures 4 and 5 are a front F perspective view and a rear B perspective view of the loop fixing stopper according to an embodiment of the present invention.

[0034] Referring to FIGS. 1 to 5, the loop fixing stopper 200 includes a main plate 210 and both side walls 220 protruding from the side ends of the main plate 210 in the direction of the rear surface B.

[0035] In the main plate 210, first and second rows 211, 212 of through holes are formed on the left and right. The first and second rows 211, 212 of through holes each include at least one through hole into which the first and second string extension parts 120, 121 are inserted and extend from the front surface F to the rear surface B.

[0036] According to an embodiment of the present invention, the first and second rows 211, 212 of through holes include upper through holes 211a, 212a and lower through holes 211b, 212b.

[0037] Each of the first and second rows 211, 212 of through holes forms a path along which the first and second string extension parts 120, 121 extend respectively. As can be seen from the enlarged view of FIG. 1, the upper through holes 211a, 212a form a path through which the first and second string extension parts 120, 121 penetrate from the rear surface B to the front surface F of the main plate 210. The lower through holes 211b, 212b form a path through which the first and second string extension parts 120, 121 drawn out to the front surface F through the upper through holes 211a, 212a penetrate from the front surface F to the rear surface B. The first and second string extension parts 120, 121 pass through the lower through holes 211b, 212b and extend toward the pulley 300, and are fixed to the pulley 300 via the string coupling part 325.

[0038] When the both side walls 220 form a knot for fixing the loop string 100 through the loop fixing stopper 200, the loop part 110 is fixed between the both side walls 220 to prevent detachment.

[0039] FIG. 6 is a diagram for explaining the process in which the loop part of the loop string is coupled and fixed to the loop fixing stopper.

[0040] Referring to FIG. 6, first, after passing the loop portion 110 of the loop string 100 over the support base 10 and hanging it on the support base 10, the loop portion 110 is pulled to the position of the loop fixing stopper 200. Then, after moving the loop portion 110 to the rear side of the loop fixing stopper 200, the pulley 300 is pulled downward.

[0041] Thereby, as can be seen from the enlarged view of FIG. 2, after the loop portion 110 passes through the rows 211, 212 of the first and second through holes from the rear surface B of the loop fixing stopper 200, it is hung on the first and second string extension portions 120, 121 extending downward. That is, the loop portion 110 is interposed between the rear surface B of the loop fixing stopper 200 and the first and second string extension portions 120, 121, and the first and second string extension portions 120, 121 that have passed through the rows 211, 212 of the first and second through holes pass through the loop portion 110 and extend downward.

[0042] When the pulley 300 to which the first and second string extension portions 120, 121 are coupled is pulled, a tension acts on the first and second string extension portions 120, 121 in the downward direction, and a tension acts on the loop portion 110 in the upward direction, generating a tightening force to fix the loop portion 110. In this specification, as described above through the loop fixing stopper 200, the formation of a knot where the loop string 100 is fixed is referred to. According to the present invention, the loop portion 110 extends between the both side walls 220, the loop portion 110 is not opened in the outer direction, jamming occurs while the loop portion 110 and the first and second string extension portions 120, 121 interfere with each other, and the knot is firmly fixed.

[0043] Since the loop string 100 is fixed by the knot formed by the loop fixing stopper 200, the pulley 300 can maintain the state of being suspended from the support base 10 by the loop string 100 at the adjusted position.

[0044] FIG. 7 is a diagram for explaining the adjustment of the length of the loop string and the height of the pulley by the movement of the loop fixing stopper. FIG. 7(a) shows a state where the loop fixing stopper 200 has moved upward along the first and second string extension portions 120 and 121, and FIG. 7(b) shows a state where the loop fixing stopper 200 has moved downward along the first and second string extension portions 120 and 121 to a position below the position visible from FIG. 7(a).

[0045] As shown in FIG. 7(a), if the loop fixing stopper 200 moves downward along the first and second string extension portions 120 and 121, the length of the loop string 100 overlapping above the loop fixing stopper 200 increases. Accordingly, the length extending downward of the loop string 100 becomes shorter, and the pulley 300 located below the loop fixing stopper 200 rises. Conversely, as shown in FIG. 7(b), if the loop fixing stopper 200 moves upward along the first and second string extension portions 120 and 121, the length of the loop string 100 overlapping above the loop fixing stopper 200 decreases. Accordingly, the length that the loop string 100 extends downward becomes longer, and the pulley 300 located below the loop fixing stopper 200 descends.

[0046] According to the present invention, after hanging the loop string 100 on the support base 10 and then hanging the loop portion 110 on the loop fixing stopper 200, a knot for fixing the loop string 100 is made, so that the operation of suspending the pulley 300 in the air can be easily performed. Further, by moving the loop fixing stopper 200 along the first and second string extension portions 120 and 121, the distance between the support base 10 and the pulley 300 can be easily adjusted. Accordingly, the height at which the pulley 300 is suspended in the air can be easily adjusted.

[0047] FIG. 8 shows an example in which the pulley device according to an embodiment of the present invention is embodied as an arm stretching exercise device. The pulley device according to an embodiment of the present invention further includes a moving string and a handle, and enables an arm stretching exercise.

[0048] Referring to FIG. 8, the moving string 400 is hung on the groove 312 of the pulley wheel 310 and extends on both sides, and the extended portions form moving string extensions 401 and 402 respectively. One-side and the other-side handles 451 and 452 are fixed to each of the moving string extensions 401 and 402.

[0049] When pulling the one-side handle 451, the moving string 400 moves along with the rotation of the pulley wheel 310 and the other-side handle 452 rises. Accordingly, the stretching of the arm with the other-side handle 452 is performed. In the opposite case, the stretching of the arm with the one-side handle 451 is performed. In this way, the stretching exercise of both arms can be performed while alternately pulling the one-side and the other-side handles 451 and 452.

[0050] Hollows 455 are formed in the one-side and the other-side handles 451 and 452 so that the moving string extensions 401 and 402 can pass through.

[0051] According to an embodiment of the present invention, a string stopper 500 that connects the one-side and the other-side handles 451 and 452 to the moving string extensions 401 and 402 is included. The string stopper 500 is position-adjustable along the moving string extensions 401 and 402, whereby the heights of the one-side and the other-side handles 451 and 452 are adjusted.

[0052] FIG. 9 is a cross-sectional view of the string stopper of the pulley device according to an embodiment of the present invention, and FIG. 10 is a diagram for explaining that the height of the handle is adjusted using the string stopper shown in FIG. 9.

[0053] Referring to FIG. 9, inside the main body 510 of the string stopper 500, a path through which the moving string extensions 401 and 402 pass is formed. The path includes an insertion hole path 520 through which the moving string extensions 401 and 402 extending downward from the pulley 300 pass while being bent multiple times inside the main body 510 and are discharged to the outside of the main body 510, and a fixing hole path 530 into which the ends 405 of the moving string extensions 401 and 402 passing through the hollows 455 of the one-side and the other-side handles 451 and 452 are inserted and fixed.

[0054] The main body 510 can have a triangular shape with a rounded vertex portion. Also, the main body 510 may be formed of a plastic material.

[0055] The insertion hole path 520 includes a first insertion hole 522 formed at the upper part of the main body 510 and extending downward, a first side insertion hole 524 bent with respect to the first insertion hole 522 and extending to one side of the main body 510 inside, and a second insertion hole 526 bent with respect to the first side insertion hole 524 and extending downward. The first side insertion hole 524 intersects and extends orthogonally to the first insertion hole 522, and the second insertion hole 526 intersects and extends orthogonally to the first side insertion hole 524. The second insertion hole 526 is formed such that the outer wall 526a is shorter than the inner wall 526b, and the moving string extensions 401 and 402 passing through the second insertion hole 526 extend while opening outward toward the one-side and the other-side handles 451 and 452. However, it is not limited to this.

[0056] The connecting portion 525 between the first side insertion hole 524 and the second insertion hole 526 is formed to be open on one side surface of the main body 510. Also, it includes a second side insertion hole 528 connected to the first side insertion hole 524 and extending in the other-side direction of the main body 510.

[0057] The moving string extension parts 401 and 402 extending from the pulley 300 are inserted through the first insertion hole 522, bent, and inserted into the first side insertion hole 524. Since the first side insertion hole 524 intersects and extends orthogonally to the first insertion hole 522, it is difficult for the end of the moving string 400 inserted into the first insertion hole 522 to enter the first side insertion hole 524. At this time, a tool can be inserted into the second side insertion hole 528 to allow the moving string extension parts 401 and 402 to enter the first side insertion hole 524. The moving string extension parts 401 and 402 inserted through the first side insertion hole 524 can be pulled outside the main body 510 through the opened connecting part 525. Then, the moving string extension parts 401 and 402 are inserted into the second insertion hole 526 and pulled downward. As a result, the moving string extension parts 401 and 402 are discharged outside the main body 510 and extend toward the one - side and the other - side handles 451 and 452.

[0058] In the path 520 of the insertion hole, the moving string extension parts 401 and 402 are bent while passing through the first insertion hole 522, the first side insertion hole 524, and the second insertion hole 526, and are discharged outside the main body 510. At the boundaries of the first insertion hole 522, the first side insertion hole 524, and the second insertion hole 526 where the moving string extension parts 401 and 402 are bent, frictional force is generated. Such a friction point f plays a role in strengthening the fixing effect of the moving string 400 when tension is approved for the moving string 400. Since the bending occurs inside the main body 510 to form the friction point f, even if a large force is applied to the one - side and the other - side handles 451 and 452, it is possible to prevent the moving string extension parts 401 and 402 from slipping.

[0059] The moving string extension parts 401 and 402 discharged from the string stopper 500 pass through the hollows 455 of the one - side and the other - side handles 451 and 452, and the ends 405 are inserted into and fixed in the path 530 of the fixing holes of the string stopper 500.

[0060] The path 530 of the fixed hole is formed at the lower part of the main body 510 and includes an end fixing hole 532 where the ends 405 of the moving string extensions 401, 402 are fixed, and an end insertion hole 534 that intersects and is connected to the end fixing hole 532 and extends in the other side direction of the main body 510. The end fixing hole 532 and the first insertion hole 522 are arranged on the central axis of the main body 510. The other side surface of the main body 510 where the end insertion hole 534 is formed forms an opening 536 that is open in the lower and side directions. The opening 536 is located on the opposite side of the second insertion hole 526.

[0061] The moving string extensions 401, 402 are inserted into the end fixing hole 532 through the opening 536 and the end insertion hole 534 on the other side of the main body 510. The ends 405 of the moving string extensions 401, 402 are tied to form knots or are arranged in the end fixing hole 532 in a state of being combined with a fixture to prevent detachment. Thereby, the operation of connecting the one - side and the other - side handles 451, 452 to the moving string extensions 401, 402 is completed.

[0062] The opening 536 formed on the other side of the main body 510 allows the moving string extensions 401, 402 introduced into the end insertion hole 534 to extend symmetrically with respect to the string stopper 500. Therefore, the moving string extensions 401, 402 can form a symmetric arrangement with respect to the central axis of the string stopper 500 on the lower side of the main body 510.

[0063] Since the moving string 400 extends while bending multiple times inside the main body 510 of the string stopper 500, when tension is formed in the moving string 400, the frictional force increases, and the effect of fixing the moving string is enhanced.

[0064] Referring to FIG. 10, the positions of the one-side and the other-side handles 451 and 452 can be adjusted by moving the moving string 400 along the path 520 of the insertion hole. As shown in FIG. 10(a), when the string stopper 500 is moved downward along the moving string extensions 401 and 402, the length of the overlap of the moving string extensions 401 and 402 between the string stopper 500 and the one-side and the other-side handles 451 and 452 becomes shorter, so the positions of the one-side and the other-side handles 451 and 452 can be adjusted downward. On the contrary, as shown in FIG. 10(b), when the string stopper 500 is moved upward along the moving string extensions 401 and 402, the length of the overlap of the moving string extensions 401 and 402 between the string stopper 500 and the one-side and the other-side handles 451 and 452 extends, and the positions of the one-side and the other-side handles 451 and 452 can be adjusted upward. In this way, the heights of the one-side and the other-side handles 451 and 452 can be adjusted according to the user's body size.

[0065] In the string stopper 500 according to the present invention, since the moving string 400 bends while passing through the inside of the main body 510, the bent portion is not exposed to the outside, so the appearance is beautiful. In addition, since sufficient rigidity can be ensured even when the main body 510 is formed of a plastic material, the manufacturing cost can be reduced compared to a stopper made of a metal material.

[0066] The protection scope of this field is not limited to the description and expression of the embodiments explicitly described above. Also, it is re-stated that the protection scope of the present invention is not limited by obvious changes and substitutions in the technical field to which the present invention belongs.

Claims

1. A loop string having a loop portion formed in an annular shape on one side and first and second string extension portions extending to the other side on both strands of the loop portion, wherein when the loop string is hung on a support base located on the upper side, the loop string in which the loop portion extends downward together with the first and second string extension portions, A loop fixing stopper having a first and a second row of through holes through which the first and second string extension portions penetrate, and the loop portion can form a knot that is hung on the rear surface to fix the loop string, A pulley including a pulley housing to which ends of the first and second string extension portions extending through the loop fixing stopper are connected, and a pulley wheel rotatably attached by a coupling shaft between both side coupling plates of the pulley housing, and having a groove formed around the circumference through which a moving string can turn. The pulley device is characterized by including the pulley.

2. The pulley device according to claim 1, wherein the loop fixing stopper is movably coupled along the first and second string extension portions so that the position where the pulley is suspended in the air by the loop string can be adjusted.

3. The rows of the first and second through holes of the loop fixing stopper are The pulley device according to claim 2, including an upper through hole that allows the first and second string extension portions to extend from the rear surface to the front surface, and a lower through hole that allows the first and second string extension portions to extend from the front surface to the rear surface.

4. The loop fixing stopper includes a main plate in which the rows of the first and second through holes are formed, and both side walls protruding rearward from both sides of the main plate, The pulley device according to claim 2, wherein the both side walls can support the loop portion hung between the first and second string extension portions and the rear surface of the main plate so as to extend between the both side walls.

5. The pulley housing includes a string coupling portion formed by through holes on the upper surface into which respective ends of the first and second string extension portions are inserted, The pulley device according to claim 1, wherein the ends of the first and second string extension parts are fixed so as to be prevented from detaching from a coupling space formed at the upper part inside the pulley housing.

6. A moving string having moving string extension parts on both sides that are hung on the groove of the pulley wheel and extend downward, The pulley device according to claim 1, further comprising a handle coupled to each lower part of the moving string extension parts, and being configured such that a stretching movement of an arm is possible.

7. The handle has a hollow through which the moving string extension part is inserted and passes, The moving string extension part is provided with a string stopper that connects the handle and enables adjustment of the height of the handle, An insertion hole path and a fixing hole path are formed inside the main body of the string stopper, The insertion hole path is such that the moving string extension part is discharged while being bent inside the main body and extends to the handle side, and the moving string extension part can be fixed by a frictional force formed while being bent inside the main body, The pulley device according to claim 6, wherein the fixing hole path is such that the end of the moving string extension part that has passed through the hollow of the handle is inserted and fixed.

8. The insertion hole path is a first insertion hole formed at the upper part of the main body and extending downward, a first side insertion hole intersecting the first insertion hole and extending to one side of the main body, and a second insertion hole intersecting the first side insertion hole and extending downward, and is characterized by including these. The pulley device according to claim 7.

9. The connecting part of the first side insertion hole and the second insertion hole is formed to be open on one side surface of the main body, The pulley device according to claim 8, wherein a second side insertion hole is formed that is connected to the first side insertion hole and extends to the other side of the main body.

10. The fixing hole path includes an end fixing hole where the end of the moving string extension part is fixed, and an end insertion hole that intersects the end fixing hole and extends in the other side direction of the main body, and the end of the moving string extension part is inserted into the end fixing hole. The pulley device according to claim 8, characterized by including these.

11. The path of the first insertion hole and the end fixing hole are arranged on the central axis of the main body. The pulley device according to claim 10, wherein the moving string extension part forms a symmetric arrangement with respect to the central axis of the main body on the lower side of the main body.

12. The pulley device according to claim 11, wherein an opening through which the moving string extension part passes is formed on the main body on the side opposite to the second insertion hole.

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