Leg extension machine

Abstract

To provide a leg extension machine that enables a user to exercise by lifting a weight with movements of lifting a lever connected to the weight while being seated, and that is usable adapting not only to length of the user's leg but also with thickness of the leg.SOLUTION: A leg extension machine 1 includes: a frame part 10 standing upright while supported by a floor; a seat part 20 connected to the frame part 10, providing a space where a user can be seated, and whose standing angle and height are adjustable; an exercise rotation part 30 connected to the frame part 10, disposed adjacent to the seat part 20, provides a space where the seated user to hang his or her legs, and rotated by an external force applied by the user; a weight part 40 supported by the frame part 10 and accommodating a plurality of weights; a weight transmission part 50 which is connected to the frame part 10, mediates the exercise rotation part 30 and the weight part 40, and linked to the rotation of the exercise rotation part 30 to raise and lower the weight of the weight part 40.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a leg extension machine, and more particularly, to a leg extension machine that can lift and move a weight by lifting a lever connected to the weight while the user is seated, and can be used corresponding not only to the length of the user's leg but also to the thickness of the leg.

Background Art

[0002] Recently, due to the boom of obesity prevention or adult disease prevention and self-management, almost all people of all ages and both genders enjoy various exercises. Although the types of such exercises are very diverse, recently many people have registered at sports gyms to exercise.

[0003] The reason why many people exercise at sports gyms is that there are various exercise equipment and the weight load of muscle training can be appropriately adjusted according to their physical conditions and exercise amounts. In addition, sports gyms have the advantage that they can be used regardless of season, weather, and time.

[0004] Generally, exercises at sports gyms are roughly classified into aerobic exercises and equipment exercises, and are further classified into upper body muscle training, lower body muscle training, abdominal muscle training, etc. according to the exercise purpose.

[0005] Among them, typical exercise equipment for lower body muscle training includes a leg curl machine, a leg extension machine, an air walker machine, etc.

[0006] Existing leg extension machines only adjust the position of the seating part to correspond only to the length of the user's leg and do not consider various thickness levels of the thighs, so there is inconvenience in use.

[0007] Therefore, research on a leg extension machine that can be used corresponding not only to the length of the user's leg but also to the thickness of the leg is required.

Prior Art Documents

[0008] [Patent Document 1] Korean Registered Utility Model Publication No. 20-0453493 [Overview of the project] [Problems that the invention aims to solve]

[0009] The object of the present invention is to provide a leg extension machine that allows the user to exercise by lifting a weight connected to a lever while remaining seated, and that can be used in accordance with the user's leg length as well as leg thickness.

[0010] Furthermore, an objective of the present invention is to provide a leg extension machine that not only has a compact overall structure and reduces manufacturing costs, but also facilitates the maintenance and management of exercise facilities. [Means for solving the problem]

[0011] A leg extension machine according to one embodiment of the present invention includes: a frame section 10 that stands upright while supported on the floor; a seating section 20 connected to the frame section 10 that provides a space for the user to sit and allows for adjustment of the standing angle and height; a rotating section 30 connected to the frame section 10 but positioned adjacent to the seating section 20 to provide a space for the seated user to place their feet and rotated by an external force applied by the user; a weight section 40 supported by the frame section 10 that houses a plurality of weights; and a rotating section connected to the frame section 10. The seating area 20 may include a weight transmission unit 50 that mediates between the rotating unit 30 and the weight unit 40, and raises and lowers the weight of the weight unit 40 in conjunction with the rotation of the rotating unit 30, and the seating area 20 may include a buttock seating area 21 that supports the buttocks of a seated user, a back seating area 23 that supports the back of a seated user, a seating angle adjustment unit 25 that is connected to the frame unit 10 and the back seating area 23 to adjust the angle of the back seating area, and a plurality of grip units 27 that are connected to both sides of the buttock seating area 21 and provided parallel to the buttock seating area 21 so that the user can grip them.

[0012] Furthermore, the frame portion 10 according to one embodiment of the present invention includes a lower support portion 11 supported on the floor surface, a weight housing portion 13 positioned behind the anchoring portion 20 but rising from the lower support portion 11 and forming an internal storage space to provide a space for housing the weight portion 40, an anchoring support portion 15 rising from the lower support portion 11 and supporting the anchoring portion 20, a transmission support portion 17 rising from the lower support portion 11 but positioned adjacent to the weight housing portion 13 and supporting the weight transmission portion 50, and a motion support portion 19 mediating between the transmission support portion 17 and the anchoring support portion 15 and supporting the motion rotation portion 30. The anchoring support portion 15 may include a pair of anchoring support pieces 151 that support the rear anchoring portion 21, a pair of bending support pieces 153 that extend from a first point of the pair of anchoring support pieces 151, a rotating support piece 155 that mediates between the pair of anchoring support pieces 151 and the back anchoring portion 23, and is provided with a plurality of rotating links 1551 in the space between the pair of anchoring support pieces 151 so that the back anchoring portion 23 can rotate, and an anchoring height adjusting portion 157 which has one end linked to a point on the lower support portion 11 and the other end linked to the pair of bending support pieces 153 and is provided to adjust the height of the pair of bending support pieces 153.

[0013] Furthermore, the anchoring angle adjustment unit 25 according to one embodiment of the present invention may also include an angle adjustment plate 251 formed in a fan shape, which operates in conjunction with the back anchoring unit 23 while remaining fixed to the rotation link 1551; a plurality of angle adjustment holes 253 that penetrate the angle adjustment plate 251 but are spaced apart along an arc; a fixing lever module 255 which is connected to a second point of the anchoring support piece 151 and inserted into at least one of the plurality of angle adjustment holes 253 to fix the angle of the back anchoring unit 23; and a damper 257 which mediates between a third point of the anchoring support piece 151 and a point of the angle adjustment plate 251, and pulls the angle adjustment plate 251 toward the third point of the anchoring support piece 151 when the fixing lever module 255 is released.

[0014] Furthermore, the weight section 40 according to one embodiment of the present invention includes a weight stacking section 41 formed by stacking multiple weights that are separated from each other while being housed in the weight housing section 13, a wire 43 connected on one side to the weight transmission section 50 and on the other side to the weight stacking section 41, which raises and lowers the weight stacking section 41 by the movement of the weight transmission section 50, and a mediating element between the wire 43 and the weight stacking section 41, wherein the weights attached to it differ depending on the connection state with the weight stacking section 41. The weight transmission unit includes a weight mediating section 45, a mediating pin 47 that determines the connection state between the weight mediating section 45 and the weight stacking section 41, and a guide roller section 49 that provides a movement path for the wire 43 while being housed in the weight housing section 13. The guide roller section 49 includes a first upper roller piece 491 which is located on the upper side of the weight housing section 13 but is aligned with the weight mediating section 45, a second upper roller piece 492 which is housed in the weight housing section 13, is located adjacent to the first upper roller piece 491 and is deflected toward the weight transmission section 50, and a lower roller piece 495 which is housed in the weight housing section 13, is located below the second upper roller piece 492 but is located adjacent to the weight transmission section 50. The weight transmission section 50 includes a transmission pivot shaft 51 which is rotatably connected to the transmission support section 17, and a transmission adjustment plate 53 which is connected to the transmission pivot shaft 51 and is linked to and rotated by the wire 43. The transmission adjustment plate 53 may include a first fan-shaped portion 531 formed in a fan shape, a plurality of first through holes 533 that penetrate the first fan-shaped portion 531 but are spaced apart according to the arc shape, a wire fixing portion 535 formed on one side of the first fan-shaped portion to which the wire 43 is fixed, and a wire guide portion 537 that guides the wire 43 fixed to the wire fixing portion 535 so that it is positioned along the outer circumferential surface of the first fan-shaped portion 531.

[0015] Furthermore, the motion rotating part 30 according to one embodiment of the present invention includes a connecting rotating shaft 31 formed in concentric multi-stages so as to surround the outer circumferential surface of the transmission rotating shaft 51 and rotatably connected to the transmission rotating shaft 51, an interlocking bar 33 connected perpendicularly to the connecting rotating shaft 31, an adjustment rotating shaft 35 rotatably connected to the end of the interlocking bar 33, a motion adjustment plate 37 formed at the end of the interlocking bar 33, and a space for mounting a hanging part 38 connected to the adjustment rotating shaft 35 on which the user's foot can be placed. The motion adjustment plate 37 includes a motion connecting portion 39 which is detachably connected, and the connecting pivot shaft 31 is arranged parallel to the first fan-shaped portion 531, and the end of the bending selection portion 311 is located above the plurality of first through holes 533, and the end of the bending selection portion 311 is formed to be released from the through hole when an applied external force is applied while inserted into one of the plurality of first through holes 533, and when the applied external force is released, it returns to be inserted into the opposite through hole. The movement adjustment plate 37 includes a second fan-shaped section 371 formed in a fan shape and a plurality of second through holes 373 that penetrate the second fan-shaped section 371 but are spaced apart along an arc, and the movement connection section is arranged parallel to the second fan-shaped section 371, and its end is the The device includes a motion selection portion 391 positioned above a plurality of second through-holes 373, and a motion button portion 393 formed at the end of the motion selection portion 391, which, when inserted into any one of the plurality of second through-holes 373, is released from insertion by an applied external force, and returns to be inserted into the opposite through-hole when the applied external force is released, wherein the separation distance between the hanging portion 38 and the anchoring portion 20 changes depending on the connection position of the motion button portion 393 with the second fan-shaped portion 371. [Effects of the Invention]

[0016] According to an embodiment of the present invention, a leg extension machine can lift and move a weight by lifting a lever connected to the weight while the user is seated, and has an effect that it can be used corresponding not only to the length of the user's leg but also to the thickness of the leg.

[0017] Moreover, according to an embodiment of the present invention, a leg extension machine has an effect that not only can the overall configuration be made compact and the manufacturing cost be reduced, but also the maintenance and management of the exercise facility are easy.

Brief Description of the Drawings

[0018] [Figure 1] It is a diagram showing a leg extension machine according to an embodiment of the present invention. [Figure 2] It is a diagram showing a frame part according to an embodiment of the present invention. [Figure 3] It is a diagram showing a seating support part according to an embodiment of the present invention. [Figure 4] It is a diagram showing a seating part according to an embodiment of the present invention. [Figure 5] It is a diagram showing a seating angle adjustment part according to an embodiment of the present invention. [Figure 6] It is a diagram showing a movement rotation part according to an embodiment of the present invention. [Figure 7] It is a diagram showing a weight part according to an embodiment of the present invention. [Figure 8] It is a diagram showing a weight transmission part according to an embodiment of the present invention. [Figure 9] It is a comparison diagram of adjusting the angle and height of a leg extension machine according to an embodiment of the present invention.

Modes for Carrying out the Invention

[0019] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the idea of the present invention is not limited to the presented embodiments, and those skilled in the art who understand the idea of the present invention can easily propose other inventions that are regressive or other embodiments within the scope of the idea of the present invention by adding, changing, deleting other components, etc. within the scope of the same idea, and this can also be said to be included within the scope of the inventive idea of this application.

[0020] Hereinafter, the leg extension machine 1 of the present invention will be described in detail with reference to the attached FIGS. 1 to 8.

[0021] FIG. 1 is a view showing a leg extension machine according to an embodiment of the present invention.

[0022] Referring to FIG. 1, the leg extension machine 1 according to an embodiment of the present invention may include a frame part 10, a seating part 20, a moving and rotating part 30, a weight part 40, and a weight transmission part 50.

[0023] The frame part 10 can stand up while being supported on the floor. The frame part 10 will be described in more detail with reference to FIG. 2.

[0024] FIG. 2 is a view showing a frame part according to an embodiment of the present invention.

[0025] Referring to FIG. 2, the frame part 10 according to an embodiment of the present invention may include a lower support part 11, a weight storage part 13, a seating support part 15, and a transmission support part 17.

[0026] The lower support part 11 can be supported on the floor surface.

[0027] The weight storage part 13 is arranged behind the seating part 20, but stands up from the lower support part 11, forms an accommodation space inside, and provides a space for accommodating the weight part 40. The weight storage part 13 may be provided with an adjustment opening 131 that is opened from the front surface facing the seating part 20 so that at least a part of the weight part 40 is exposed to the outside.

[0028] The anchoring support portion 15 rises from the lower support portion 11 and can support the anchoring portion 20. The anchoring support portion 15 will be described in more detail with reference to Figure 3.

[0029] Figure 3 shows a fixed support portion according to one embodiment of the present invention.

[0030] Referring to Figure 3, the anchoring support section 15 according to one embodiment of the present invention may include a pair of anchoring support pieces 151, a pair of bending support pieces 153, a rotating support piece 155, and an anchoring height adjustment section 157.

[0031] The pair of anchoring support pieces 151 can support the tail anchoring portion 21.

[0032] The pair of bent support pieces 153 may extend from the first point of the pair of anchoring support pieces 151.

[0033] The rotating support piece 155 mediates between the pair of anchoring support pieces 151 and the back anchoring portion 23, but a plurality of rotating links 1551 are provided in the space between the pair of anchoring support pieces 151 so that the back anchoring portion 23 can rotate.

[0034] The anchoring height adjustment section 157 is linked at one end to a point on the lower support section 11 and linked at the other end to the pair of bendable support pieces 153, and is provided to adjust the height of the pair of bendable support pieces 153. The anchoring height adjustment section 157 may consist of two types of bars and a height adjustment button. A height adjustment grip section 159 may be provided at a point on the bendable support piece 153 for convenience when adjusting the height using the anchoring height adjustment section 157. The provision of the anchoring height adjustment section 157 has the effect of adjusting the angle of the rear anchoring section 21 by adjusting the height of one side of the rear anchoring section 21.

[0035] Referring again to Figure 2, the transmission support section 17 rises from the lower support section 11, but is positioned adjacent to the weight housing section 13 and supports the weight transmission section 50.

[0036] Referring again to Figure 1, the anchoring section 20 is connected to the frame section 10, providing a space for the user to sit, and can be equipped to allow adjustment of the standing angle and height. The anchoring section 20 will be described in more detail with reference to Figure 4.

[0037] Figure 4 shows an attachment portion according to one embodiment of the present invention.

[0038] Referring to Figure 4, the attachment portion 20 according to one embodiment of the present invention may include a buttock attachment portion 21, a back attachment portion 23, an attachment angle adjustment portion 25, and a pair of grip portions 27.

[0039] The buttock support section 21 supports the buttocks of the seated user.

[0040] The back support portion 23 supports the back of the seated user.

[0041] The anchoring angle adjustment unit 25 is connected to the frame unit 10 and the back anchoring unit 23, and can adjust the angle of the back anchoring unit 23. The anchoring angle adjustment unit 25 will be described in more detail with reference to Figure 5.

[0042] Figure 5 shows a mounting angle adjustment section according to one embodiment of the present invention.

[0043] Referring to Figure 5, the anchoring angle adjustment unit 25 according to one embodiment of the present invention may include an angle adjustment plate 251, a plurality of angle adjustment holes 253, a fixing lever module 255, and a damper 257.

[0044] The angle adjustment plate 251 remains fixed to the rotation link 1551 and operates in conjunction with the back attachment portion 23, and may be formed in a fan shape.

[0045] The multiple angle adjustment holes 253 penetrate the angle adjustment plate 251, but can be spaced apart along an arc shape.

[0046] The fixing lever module 255 is connected to the second point of the anchoring support piece 151 and inserted into at least one of the plurality of angle adjustment holes 253 to fix the angle of the back anchoring portion 23.

[0047] The damper 257 acts as an intermediary between the third point on the anchoring support piece 151 and one point on the angle adjustment plate 251, allowing the angle adjustment plate 251 to be pulled towards the third point on the anchoring support piece 151 when the fixing lever module 255 is released.

[0048] Referring again to Figure 4, the pair of grip portions 27 may remain connected to both sides of the buttock rest portion 21 and be provided parallel to the buttock rest portion 21 so that the user can grip them.

[0049] Referring again to Figure 1, the rotating part 30 is connected to the frame part 10, but is positioned adjacent to the resting part 20 to provide space for a seated user to place their feet, and can be rotated by an external force applied by the user. The rotating part 30 will be described in more detail with reference to Figure 6.

[0050] Figure 6 shows a rotating part according to one embodiment of the present invention.

[0051] Referring to Figure 6, the motion rotating part 30 according to one embodiment of the present invention may include a connecting rotating shaft 31, an interlocking bar 33, an adjustment rotating shaft 35, a motion adjustment plate 37, and a motion connecting part 39.

[0052] The connecting pivot shaft 31 is formed in a concentric multi-stage configuration so as to surround the outer circumferential surface of the transmission pivot shaft 51, and can be rotatably connected to the transmission pivot shaft 51 as a reference. The connecting pivot shaft 31 may also include a bending selection section and an interlocking button section.

[0053] The bending selection portion 311 may be arranged parallel to the first fan-shaped portion 531, with its end positioned above the plurality of first through holes 533.

[0054] The interlocking button portion 313 is formed at the end of the bending selection portion 311 and, when inserted into one of the plurality of first through holes 533, can be released from the through hole by an applied external force, and when the applied external force is released, it can return to being inserted into the opposite through hole. The interlocking button portion 313 may be provided such that the height of the hanging portion 38 from the floor changes, by changing the forming angle of the interlocking bar 33 with the floor surface depending on the connection position with the first fan-shaped portion 531.

[0055] Specifically, the interlocking button section 313 allows the user to adjust the knee height according to their body type and physical condition. Normally, a user who has difficulty extending their knees may find it difficult to place their feet on the hook section 38 when lying face down, but in this case, the height of the hook section 38 can be raised to allow them to exercise.

[0056] The interlocking bar 33 can be connected perpendicularly to the connecting pivot shaft 31.

[0057] The adjustment pivot shaft 35 can be rotatably connected to the end of the interlocking bar 33.

[0058] The motion adjustment plate 37 can be formed at the end of the interlocking bar 33. The motion adjustment plate 37 may include a second fan-shaped portion 371 formed in a fan shape and a plurality of second through holes 373 that penetrate the second fan-shaped portion 371 but are spaced apart along an arc.

[0059] The motion connecting portion 39 is connected to the adjustment pivot shaft 35, provides space for mounting a hook portion 38 on which the user's foot rests, and can be detachably connected to the motion adjustment plate 37. The motion connecting portion may include a motion selection portion 391 arranged parallel to the second fan-shaped portion 371, with its end positioned above the plurality of second through holes 373, and a motion button portion 393 formed at the end of the motion selection portion 391, which, when inserted into one of the plurality of second through holes 373, is released from the through hole by an applied external force, and returns to be inserted into the opposite through hole when the applied external force is released. The motion button portion 393 may be provided such that the separation distance between the hook portion 38 and the anchor portion 20 changes depending on the connection position with the second fan-shaped portion 371.

[0060] Referring again to Figure 1, the weight section 40 is supported by the frame section 10 and can accommodate multiple weights. The weight section 40 will be described in more detail with reference to Figure 7.

[0061] Figure 7 shows the weight portion according to one embodiment of the present invention.

[0062] Referring to Figure 7, the weight section 40 according to one embodiment of the present invention may include a weight stacking section 41, a wire 43, a weight mediating section 45, a mediating pin 47, and a guide roller section 49.

[0063] The weight stacking section 41 is formed by stacking multiple weights that are separated from each other while remaining housed in the weight housing section 13.

[0064] The wire 43 is connected to the weight transmission section 50 on one end and to the weight stacking section 41 on the other end, allowing the weight stacking section 41 to be raised and lowered by the movement of the weight transmission section 50.

[0065] The weight mediating section 45 mediates between the wire 43 and the weight stacking section 41, but the weight to which it is attached can vary depending on the connection state with the weight stacking section 41.

[0066] The mediating pin 47 can determine the connection state between the weight mediating section 45 and the weight stacking section 41.

[0067] The guide roller section 49 can provide a movement path for the wire 43 while remaining housed in the weight housing section 13.

[0068] The guide roller section 49 may include a first upper roller piece 491, a second upper roller piece 492, and a lower roller piece 495.

[0069] The first upper roller piece 491 is positioned on the upper side within the weight housing section 13, but may be positioned on the same line as the weight mediating section 45.

[0070] The second upper roller piece 492 is housed in the weight housing section 13, is positioned adjacent to the first upper roller piece 491, and may be positioned so as to be deflected toward the weight transmission section 50.

[0071] The lower roller piece 495 is housed in the weight housing section 13 and is positioned below the second upper roller piece 492, but may be positioned adjacent to the weight transmission section 50.

[0072] The guide roller section 49 can improve the efficiency of transmitting external forces by ensuring that tension is maintained without twisting of the wire 43 from the weight stacking section 41 to the weight transmission section 50.

[0073] Referring again to Figure 1, the weight transmission unit 50 is connected to the frame unit 10 and acts as an intermediary between the moving / rotating unit 30 and the weight unit 40, allowing the weight of the weight unit 40 to be raised and lowered in conjunction with the rotation of the moving / rotating unit 30. The weight transmission unit 50 will be described in more detail with reference to Figure 8.

[0074] Figure 8 shows a weight transmission section according to one embodiment of the present invention.

[0075] Referring to Figure 8, the weight transmission unit 50 according to one embodiment of the present invention may include a transmission pivot shaft 51 and a transmission adjustment plate 53.

[0076] The transmission pivot shaft 51 can be rotatably connected to the transmission support section 17.

[0077] The transmission adjustment plate 53 remains connected to the transmission pivot shaft 51 and is linked to it, and can be rotated by the wire 43.

[0078] The transmission adjustment plate 53 may include a first fan-shaped portion 531, a plurality of first through holes 533, a wire fixing portion 535, and a wire guide portion 537.

[0079] The first sector-shaped portion 531 may be formed in a sector shape.

[0080] The multiple first through holes penetrate the first sector-shaped portion 531, but are spaced apart along the arc shape.

[0081] The wire fixing portion 535 is formed on one side of the first fan-shaped portion 531, and the wire 43 can be fixed thereto.

[0082] The wire guide portion 537 can guide the wire 43, which is fixed to the wire fixing portion 535, so that it is positioned along the outer circumferential surface of the first fan-shaped portion 531.

[0083] The wire guide portion 537 can prevent the wire 43 from detaching from the first fan-shaped portion 531 when the wire 43 is wound or unwound along the outer circumferential surface of the first fan-shaped portion 531.

[0084] Furthermore, the following section will explain an example of angle adjustment for the leg extension machine, referring to Figure 9.

[0085] Figure 9 is a comparative diagram showing the angle and height of a leg extension machine according to one embodiment of the present invention.

[0086] As shown in Figure 9, the leg extension machine 1 of the present invention can be used in a wider variety of embodiments than those illustrated in (a) and (b).

[0087] As described above, according to one embodiment of the present invention, the user can lift the weight by raising a lever connected to the weight while remaining seated, and it has the effect of being usable not only for the length of the user's legs but also for the thickness of their legs.

[0088] Furthermore, the leg extension machine according to one embodiment of the present invention not only has a compact overall structure and reduces manufacturing costs, but also has the effect of making the maintenance and management of exercise facilities easier.

[0089] As described above, one embodiment of the present invention has been explained based on a limited number of embodiments and drawings. However, one embodiment of the present invention is not limited to the embodiments described above, and a person with ordinary skill in the art to which the present invention belongs can make various modifications and variations from this description. Therefore, one embodiment of the present invention should be understood only by the claims described below, and all equivalent or equivalent variations can be said to fall within the scope of the present invention. [Explanation of symbols]

[0090] 1: Leg extension machine 10: Frame section 20: Safeguards 30: Rotating part 40: Part by weight 50: Weight transmission section

Claims

1. A frame section (10) that stands upright while being supported on the floor; A seating area (20) connected to the frame (10) provides a space where the user can sit, and allows for adjustment of the standing angle and height; A rotating part (30) connected to the frame (10), but positioned adjacent to the anchoring part (20) to provide space for a seated user to rest their feet, and which is rotated by an external force applied by the user; A weight section (40) supported by the frame section (10) and which houses a plurality of weights; and A weight transmission unit (50) connected to the frame unit (10), mediating between the rotating motion unit (30) and the weight unit (40), and raising and lowering the weight of the weight unit (40) in conjunction with the rotation of the rotating motion unit (30); Includes, The aforementioned attachment portion (20) is A seated area (21) that supports the buttocks of the seated user; A back support area (23) that supports the back of a seated user; An attachment angle adjustment unit (25) connected to the frame portion (10) and the back attachment portion (23) for adjusting the angle of the back attachment portion (23); and Multiple grip portions (27) are provided parallel to the buttock rest portion (21) and remain connected to both sides of the buttock rest portion (21) so that the user can grip them; Includes, The frame portion (10) is Lower support part (11) supported by the floor surface; A weight housing section (13) is positioned behind the aforementioned anchoring section (20), but rises from the lower support section (11), forming a housing space inside which the weight section (40) is housed; A mounting support portion (15) that rises from the lower support portion (11) and supports the mounting portion (20); A transmission support section (17) which rises from the lower support section (11) but is positioned adjacent to the weight housing section (13) and supports the weight transmission section (50); and A motion support part (19) mediates between the transmission support part (17) and the anchoring support part (15) and supports the motion rotation part (30); Includes, The aforementioned anchoring support portion (15) is A pair of anchoring support pieces (151) that support the aforementioned anchoring portion (21); A pair of bendable support pieces (153) extending from the first point of the pair of anchoring support pieces (151); A rotating support piece (155) that mediates between the pair of anchoring support pieces (151) and the back anchoring portion (23), wherein a plurality of rotating links (1551) are provided in the space between the pair of anchoring support pieces (151) so that the back anchoring portion (23) can rotate; and A fixing height adjustment unit (157) is provided, with one end linked to a point on the lower support unit (11) and the other end linked to the pair of bendable support pieces (153), and is configured to adjust the height of the pair of bendable support pieces (153); A leg extension machine that includes [a specific feature / feature].

2. The aforementioned mounting angle adjustment unit (25) is An angle adjustment plate (251) that remains fixed to the aforementioned rotating link (1551) and operates in conjunction with the aforementioned back attachment portion (23), forming a fan shape; Multiple angle adjustment holes (253) that penetrate the angle adjustment plate (251) but are spaced apart along an arc shape; A fixing lever module (255) is connected to a second point of the aforementioned attachment support piece (151) and inserted into at least one of the plurality of angle adjustment holes (253) to fix the angle of the back attachment portion (23); and A damper (257) mediates between the third point of the anchoring support piece (151) and one point of the angle adjustment plate (251), and pulls the angle adjustment plate (251) toward the third point of the anchoring support piece (151) when the fixing lever module (255) is released; A leg extension machine according to claim 1, comprising:

3. The aforementioned weight portion (40) is A weight stacking section (41) is formed by stacking multiple weights that are separated from each other while remaining housed in the weight housing section (13); A wire (43) is connected on one side to the weight transmission section (50) and on the other side to the weight stacking section (41), causing the weight stacking section (41) to be raised and lowered by the movement of the weight transmission section (50); A weight mediator (45) that mediates between the wire (43) and the weight stacking section (41), such that the weights attached to it differ depending on the connection state with the weight stacking section (41); A mediating pin (47) that determines the connection state between the weight mediating portion (45) and the weight stacking portion (41); and A guide roller section (49) that provides a path for the movement of the wire (43) while remaining housed in the weight housing section (13); Includes, The guide roller portion (49) is A first upper roller piece (491) is positioned on the upper side within the weight housing section (13), but is aligned with the weight mediating section (45); A second upper roller piece (492) is housed in the weight housing section (13), is positioned adjacent to the first upper roller piece (491), and is positioned deflected toward the weight transmission section (50); and A lower roller piece (495) is housed in the weight housing section (13) and positioned below the second upper roller piece (492), but adjacent to the weight transmission section (50); Includes, The aforementioned weight transmission unit (50) is A transmission pivot shaft (51) rotatably connected to the transmission support portion (17); and A transmission adjustment plate (53) that remains connected to the transmission rotation shaft (51), is linked to it, and is rotated by the wire (43); Includes, The transmission adjustment plate (53) is A first sector-shaped portion (531) formed in a sector shape; Multiple first through-holes (533) that penetrate the first sector-shaped portion (531) but are spaced apart along an arc; A wire fixing portion (535) formed on one side of the first fan-shaped portion to which the wire (43) is fixed; and A wire guide portion (537) guides the wire (43), which is fixed to the wire fixing portion (535), so that it is positioned along the outer circumferential surface of the first fan-shaped portion (531); A leg extension machine according to claim 1, comprising:

4. The aforementioned rotating motion unit (30) A connecting pivot shaft (31) is formed in multiple concentric stages so as to surround the outer surface of the transmission pivot shaft (51) and is rotatably connected to the transmission pivot shaft (51) with respect to the transmission pivot shaft (51); An interlocking bar (33) is connected perpendicularly to the aforementioned connecting pivot shaft (31); An adjustable pivot shaft (35) is rotatably connected to the end of the interlocking bar (33); Motion adjustment plate (37) formed at the end of the interlocking bar (33); and A movement connecting part (39) is detachably connected to the movement adjustment plate (37), providing space for a foot rest (38) to be mounted on the adjustment pivot shaft (35) and for the user to place their foot on; Includes, The aforementioned connecting pivot shaft (31) is A bending selection portion (311) is arranged parallel to the first fan-shaped portion (531), with its end positioned above the plurality of first through holes (533); and An interlocking button (313) is formed at the end of the bending selection portion (311) and, when inserted into one of the plurality of first through holes (533), is released from the through hole by an applied external force, and returns to its original position so as to be inserted into the opposite through hole when the applied external force is released; Includes, The aforementioned interlocking button section (313) is Depending on the connection position with the first fan-shaped portion (531), the angle of formation with the bottom surface of the interlocking bar (33) changes, so that the height of the hanging portion (38) from the bottom surface changes. The motion adjustment plate (37) is A second sector-shaped portion (371) formed in a sector shape; and Multiple second through-holes (373) that penetrate the second sector-shaped portion (371) but are spaced apart along an arc; Includes, The aforementioned motion coupling portion is A motion selection unit (391) arranged parallel to the second fan-shaped portion (371), with its end positioned above the plurality of second through holes (373); and A motion button portion (393) is formed at the end of the motion selection portion (391) and, while inserted into one of the plurality of second through holes (373), is released from the through hole by an applied external force, and returns to its original position so as to be inserted into the opposite through hole when the applied external force is released; Includes, The aforementioned motion button portion (393) is The leg extension machine according to claim 3, characterized in that the distance between the hanging portion (38) and the anchoring portion (20) changes depending on the connection position with the second fan-shaped portion (371).

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