Weight training apparatus with adjustable exercise angle

Abstract

A weight training apparatus includes: a main frame; first and second exercise bars hinge-coupled to one side of the main frame and configured for a user to push or pull using handles; and an exercise bar rotating unit configured to rotate the first and second exercise bars in mutually opposite directions with respect to their longitudinal central axes. The exercise bar rotating unit includes: a connecting plate having a securing pin, hinge-coupled to the main frame between the first and second exercise bars so as to be rotatable; a holder including a plurality of angle adjustment holes, formed to secure the securing pin inserted into one of the angle adjustment holes; and first and second connecting bars connecting the first and second exercise bars to the connecting plate, and configured to rotate the first and second exercise bars respectively with respect to the central axes.

Description

TECHNICAL FIELD

[0001] The present invention relates to a weight training apparatus, and more particularly, to a weight training apparatus capable of variously adjusting the operating angle of an exercise bar.BACKGROUND ART

[0002] Conventional mechanical upper and lower body weight apparatuses used in fitness centers have a disadvantage in that the angle for pushing or pulling the exercise bar is fixed to a single angle, thereby making it difficult to stimulate various muscle areas.DESCRIPTION OF THE INVENTIONTechnical Problem

[0003] The present invention has been conceived in view of the above-mentioned problems, and an object thereof is to provide a weight training apparatus capable of adjusting the angle of an exercise bar that a user pushes and pulls during weight training.Solution to Problem

[0004] To achieve the above object, a weight training apparatus according to the present invention comprises: a main frame; first and second exercise bars hinge-coupled to one side of the main frame and configured for a user to push or pull using handles; and an exercise bar rotating unit configured to rotate the first and second exercise bars in mutually opposite directions with respect to their longitudinal central axes. The exercise bar rotating unit includes: a connecting plate having a securing pin, hinge-coupled to the main frame between the first and second exercise bars so as to be rotatable; a holder including a plurality of angle adjustment holes, formed to secure the securing pin inserted into one of the angle adjustment holes; and first and second connecting bars connecting the first and second exercise bars to the connecting plate, and configured to rotate the first and second exercise bars respectively with respect to their central axes according to the rotation of the connecting plate.Advantageous Effects

[0005] The weight training apparatus according to the present invention allows a user to stimulate various muscle areas by adjusting the angle of the exercise bar.

[0006] The effects of the present invention are not limited to the above-described effects, and should be understood to include all effects inferable from the configuration of the invention described in the detailed description or claims of the present invention.DESCRIPTION OF DRAWINGS

[0007] FIG. 1 is a perspective view of a weight training apparatus according to a first embodiment of the present invention, viewed from the left rear.

[0008] FIG. 2 is a perspective view of a weight training apparatus according to a first embodiment of the present invention, viewed from the right rear.

[0009] FIG. 3 is an enlarged view of the exercise bar rotating unit (40) of the weight training apparatus according to the first embodiment of the present invention.

[0010] FIG. 4 is a side view showing the weight training apparatus according to the first embodiment of the present invention.

[0011] FIG. 5 is a detailed view showing first and second connecting brackets (50, 60) of the weight training apparatus according to the first embodiment of the present invention.

[0012] FIG. 6 is a perspective view showing a part of a weight training apparatus according to a second embodiment of the present invention.

[0013] FIG. 7 is a front view of FIG. 6.

[0014] FIG. 8 is a perspective view showing a part of a weight training apparatus according to a third embodiment of the present invention.

[0015] FIG. 9 is a front view of FIG. 8.

[0016] FIG. 10 is a perspective view showing a part of a weight training apparatus according to a fourth embodiment of the present invention.

[0017] FIG. 11 is a plan view of FIG. 10.

[0018] FIG. 12 is a perspective view of a weight training apparatus according to a fifth embodiment of the present invention, viewed from the right side.

[0019] FIG. 13 is a perspective view of a weight training apparatus according to a fifth embodiment of the present invention, viewed from the left side.

[0020] FIG. 14 is a view showing first and second exercise bars (520, 530), an exercise bar rotating unit (540), and an exercise bar angle adjustment unit (550) according to a fifth embodiment of the present invention.

[0021] FIG. 15 is a view showing a case where the left and right angles of the first and second exercise bars (520, 530) are set to 0 degrees by the exercise bar angle adjustment unit (550) according to the fifth embodiment of the present invention.

[0022] FIG. 16 is a view showing a case where the left and right angles of the first and second exercise bars (520, 530) are set to 10 degrees by the exercise bar angle adjustment unit (550) according to the fifth embodiment of the present invention.

[0023] FIG. 17 is a view showing a case where the left and right angles of the first and second exercise bars (520, 530) are set to −10 degrees by the exercise bar angle adjustment unit (550) according to the fifth embodiment of the present invention.

[0024] FIG. 18 is a view showing a seat (511) and a swing axis support unit (515) when a swing axis (514) and third and fourth rotation axes (524, 534) share a rotation axis according to the fifth embodiment of the present invention.

[0025] FIG. 19 is a view showing a seat (511) and a swing axis support unit (515) in a state where the position of the swing axis (514) is adjusted so that the distance between the swing axis (514) and the third and fourth rotation axes (524, 534) becomes farther according to the fifth embodiment of the present invention.

[0026] FIG. 20 is a view showing a seat (511) and a swing axis support unit (515) in a state where the position of the swing axis (514) is adjusted so that the distance between the swing axis (514) and the third and fourth rotation axes (524, 534) is maximized according to the fifth embodiment of the present invention.

[0027] FIG. 21 is a view showing a swing angle adjustment unit (560) according to the fifth embodiment of the present invention.

[0028] FIG. 22 and FIG. 23 are views for explaining free swing in a forward mode according to the fifth embodiment of the present invention.

[0029] FIG. 24 and FIG. 25 are views for explaining free swing in a reverse mode according to the fifth embodiment of the present invention.

[0030] FIG. 26 is a view showing an example of first and second swing brackets (585, 586) configured integrally according to the fifth embodiment of the present invention.

[0031] FIG. 27 is a view showing another example of first and second swing brackets (585, 586) configured separately to move independently according to the fifth embodiment of the present invention.

[0032] FIG. 28 is a view showing an example of first and second swing connectors (581, 582) coupled with the first and second swing brackets (585, 586) of FIG. 26.

[0033] FIG. 29 is a view showing another example of first and second swing connectors (581, 582) coupled with the first and second swing brackets (585, 586) of FIG. 27.BEST MODE OF THE INVENTION

[0034] Hereinafter, disclosed embodiments will be described in detail with reference to the accompanying drawings.

[0035] Prior to this, it is specified that the terms described later are defined in consideration of their functions in the present invention, and should be interpreted as concepts consistent with the technical idea of the present invention and meanings commonly or ordinarily recognized in the relevant technical field. Furthermore, if it is determined that a detailed description of publicly known functions or configurations related to the present invention may obscure the gist of the present invention, the detailed description thereof will be omitted.

[0036] The upper body weight training apparatus according to the present invention is described with Shoulder Press as an example, and the lower body weight training apparatus is described with Leg Extension as an example, but the present invention is not limited thereto and can be applied to various weight training apparatuses using exercise bars or handles.First Embodiment

[0037] FIG. 1 is a perspective view of a weight training apparatus according to a first embodiment of the present invention, viewed from the left rear, FIG. 2 is a perspective view of a weight training apparatus according to a first embodiment of the present invention, viewed from the right rear, FIG. 3 is an enlarged view of the exercise bar rotating unit (40) of the weight training apparatus according to the first embodiment of the present invention, FIG. 4 is a side view showing the weight training apparatus according to the first embodiment of the present invention, and FIG. 5 is a detailed view showing first and second connecting brackets (50, 60) of the weight training apparatus according to the first embodiment of the present invention.

[0038] As shown in FIGS. 1 and 2, the weight training apparatus according to the first embodiment of the present invention includes, as main components, a main frame (10), first and second exercise bars (20, 30), an exercise bar rotating unit (40), first and second connecting brackets (50, 60), a weight unit (70), third and fourth connecting bars (80, 90), and first and second stoppers (81, 91). Other components constituting the weight training apparatus may be further included, but the description will focus on the main components of the present invention.

[0039] The main frame (10) is formed to be seated on the ground and to support and couple other components. The main frame (10) may be provided with a seat (11) for an exerciser to sit on, and a footrest, etc.

[0040] One end of the first and second exercise bars (20, 30) is hinge-coupled respectively to one side of the upper front part of the main frame (10) at a certain interval, and handles (21, 31) are formed respectively at the other end of the first and second exercise bars (20, 30) so that the user can push or pull the first and second exercise bars (20, 30).

[0041] The exercise bar rotating unit (40) is configured to rotate the first and second exercise bars (20, 30) in mutually opposite directions with respect to the longitudinal central axes of the first and second exercise bars (20, 30). The stimulated muscle area changes as the angles of the first and second exercise bars (20, 30) change.

[0042] The exercise bar rotating unit (40) includes: a connecting plate (41) having a securing pin (42), hinge-coupled to the upper front part of the main frame (10) between the first and second exercise bars (20, 30) so as to be rotatable; a holder (43) including a plurality of angle adjustment holes (43a), formed on the front part of the main frame (10) to secure the securing pin (42) inserted into one of the angle adjustment holes (43a); and first and second connecting bars (44, 45) connecting the first and second exercise bars (20, 30) to the connecting plate (41), and configured to rotate the first and second exercise bars (20, 30) respectively with respect to their central axes according to the rotation of the connecting plate (41).

[0043] The connecting plate (41) includes an angle adjustment knob (42a) coupled to the securing pin (42), and the securing pin (42) can be attached to or detached from the angle adjustment hole (43a) by moving the angle adjustment knob (42a) up and down. The connecting plate (41) is configured to rotate around its central rotation axis (41a). If the securing pin (42) is lifted to separate it from the current angle adjustment hole (43a), and the angle adjustment knob (42a) is moved upward or downward, the connecting plate (41) rotates. When the connecting plate (41) rotates to an appropriate angle, releasing the lifted securing pin (42) causes the securing pin (42) to enter another angle adjustment hole (43a), fixing the angle. The angle adjustment holes (43a) are formed in the holder (43) at regular intervals along the path of movement of the securing pin (42) due to the rotation of the connecting plate (41).

[0044] By rotating the first and second exercise bars (20, 30) in this way, the angle of each handle (21, 31) can be adjusted. Although the connecting plate (41) shown in the drawing is configured as a flat plate, its shape or size can be changed in various ways.

[0045] Furthermore, by aligning the center of the handles (21, 31) with the central axes of the first and second exercise bars (20, 30), the position of the part grasped by hand does not change even if the first and second exercise bars (20, 30) rotate. Therefore, by rotating the first and second exercise bars (20, 30) to change their angle, the outer, middle, and inner parts of the muscle can be stimulated as intended.

[0046] One end of the first connecting bar (44) is hinge-coupled to the upper part of the left end of the connecting plate (41), and the other end of the first connecting bar (44) is hinge-coupled to a first bracket (22) fixed to the lower part of the first exercise bar (20). The first connecting bar (44) moves upward or downward due to the rotation of the connecting plate (41), and the first bracket (22) and the first exercise bar (20) rotate together due to the movement of the first connecting bar (44).

[0047] One end of the second connecting bar (45) is hinge-coupled to the lower part of the left end of the connecting plate (41), and the other end of the second connecting bar (45) is hinge-coupled to a second bracket (32) fixed to the lower part of the second exercise bar (30). The second connecting bar (45) moves leftward or rightward due to the rotation of the connecting plate (41), and the second bracket (32) and the second exercise bar (30) rotate together due to the movement of the second connecting bar (45).

[0048] The securing pin (42) is coupled to the right end of the connecting plate (41) so as to penetrate the connecting plate (41).

[0049] As described above, due to the connection relationship and respective positions of the connecting plate (41) and the first and second connecting bars (44, 45), the first and second exercise bars (20, 30) rotate by the same angle in opposite directions.

[0050] The first and second brackets (22, 32) are configured as flat plates inclined downward and inward at a certain angle, but their shape and size can be configured differently depending on the connection relationship of the connecting plate (41) and the first and second connecting bars (44, 45) and their positions. Furthermore, the positions of the contact points (22a, 32a) of the first and second brackets (22, 32) also vary depending on the connection relationship of the connecting plate (41) and the first and second connecting bars (44, 45) and their positions.

[0051] As shown in FIG. 3, angle A of the first bracket (22) inclined from the horizontal direction and angle C of the second bracket (32) inclined from the horizontal direction are the same angles facing each other, and these are the angles at which the deviation is minimized when adjusting the angles of the handles (21, 31), and these can be referred to as variable angles. Angle B of the connecting plate (41) is maintained at 90 degrees, so it can be called a constant angle. Angle B is the angle between a virtual straight line connecting the rotation axis (41a) of the connecting plate (41) and the contact point of the connecting plate (41) and the first connecting bar (44), and a virtual straight line connecting the rotation axis (41a) and the contact point of the connecting plate (41) and the second connecting bar (45). This angle minimizes deviation when adjusting the angles of the handles (21, 31). Depending on the change in variable angles and constant angle, the magnitude of the angle deviation between angle A and angle B changes when adjusting the angle. For example, if the constant angle is 90 degrees and the variable angle is 60 degrees, adjusting the angle adjustment knob (42a) step-by-step by 5 degrees from −20 degrees to +20 degrees results in a negligible deviation between angle A and angle B. However, if only the variable angle is changed to 65, 70, 75, or 80 degrees, the deviation between angle A and angle B becomes severe. This means that the angles of the left and right handles (21, 31) differ, leading to different exercise angles.

[0052] If the constant angle is not 90 degrees and the variable angle is not 60 degrees, for example, if the constant angle is 120 degrees and the variable angle is 50, 55, or 65 degrees, the deviation between angle A and angle B becomes more severe than when the constant angle is 90 degrees and the variable angle is 60 degrees, making it unusable as an exercise apparatus. Therefore, angles A and B can function as an exercise apparatus only within a limited angle condition range, and if these conditions are exceeded, the angle deviation between the left and right handles (21, 31) becomes large, making it impossible to function as an exercise apparatus. Thus, it is technically very important to specify a limited angle condition range for angles A and B. When the variable angle is 60 degrees and the constant angle is 90 degrees, the rate of change (deviation) between angle A and angle B is 0.57% within the adjustment range from −20 degrees to +20 degrees, which is suitable for an exercise apparatus.

[0053] As shown in FIGS. 4 and 5, the first and second connecting brackets (50, 60) are for fixing their original position and preventing the weight unit (70) from moving together even if the first and second exercise bars (20, 30) rotate. They are respectively coupled to the lower part of the first and second exercise bars (20, 30) facing the weight unit (70). Each of the first and second connecting brackets (50, 60) is a pair of upper and lower brackets with a certain distance between them. First and second stoppers (81, 91) connecting the connecting bars (80, 90) are located in the middle. The upper and lower connecting brackets include elongated holes (51, 61) in the shape of a sector arc with a spacing that allows the stoppers sharing the vertical central axis of the first and second exercise bars (20, 30) to be assembled.

[0054] The first and second stoppers (81, 91) are in the shape of a pipe with a certain thickness to allow a central securing pin to be inserted, and their length is such that they can be assembled into the space between the upper and lower connecting brackets, and their sides are configured to be assembled with the third and fourth connecting bars (80, 90).

[0055] The weight unit (70) is for providing weight to the first and second exercise bars (20, 30), and includes left and right weight plate holders (71) capable of mounting multiple weight plates.

[0056] The third and fourth connecting bars (80, 90) are assembled and connected respectively to the first and second stoppers (81, 91) coupled with the first and second connecting brackets (50, 60). Spherical bearings that rotate in all directions (front, rear, left, right) are installed at both upper and lower ends of the third and fourth connecting bars (80, 90), and their upper ends are assembled with the first and second stoppers (81, 91), and their lower ends are assembled with the left and right weight units (70) respectively.

[0057] The first stopper (81) is inserted inside the elongated hole (51) of the first connecting bracket (50), which consists of upper and lower brackets, and the second stopper (91) is inserted inside the elongated hole (61) of the second connecting bracket (60), which consists of upper and lower brackets.

[0058] The third stopper (25) is hinge-coupled to the lower end of the first exercise bar (20), and rotates with the first exercise bar (20) around its longitudinal central axis, but restricts the movement of the first exercise bar (20) to limit the downward movement range of the handle (21). The fourth stopper (35) is hinge-coupled to the lower end of the second exercise bar (30), and rotates with the second exercise bar (30) around its longitudinal central axis, but restricts the movement of the second exercise bar (30) to limit the downward movement range of the handle (31).Second Embodiment

[0059] FIG. 6 is a perspective view showing a part of a weight training apparatus according to a second embodiment of the present invention, and FIG. 7 is a front view of FIG. 6.

[0060] The weight training apparatus according to the second embodiment of the present invention is mostly the same as the first embodiment, including the main frame (10), first and second exercise bars (20, 30), first and second connecting brackets (50, 60), weight unit (70), third and fourth connecting bars (80, 90), and first and second stoppers (81, 91). However, the exercise bar rotating unit (240), first and second brackets (222, 232), and holder (243) differ from the first embodiment. Therefore, only the exercise bar rotating unit (240), first and second brackets (222, 232), and holder (243), which are different components of the second embodiment from the first embodiment, will be described.

[0061] The exercise bar rotating unit (240) of the second embodiment is also configured to rotate the first and second exercise bars (20, 30) in mutually opposite directions with respect to the longitudinal central axes of the first and second exercise bars (20, 30). The stimulated muscle area changes as the angles of the first and second exercise bars (20, 30) change.

[0062] The exercise bar rotating unit (240) of the second embodiment includes: a first bracket (222) fixedly coupled to one end of the first exercise bar (20) so as to rotate with the first exercise bar (20); a second bracket (232) having a securing pin (242), fixedly coupled to one end of the second exercise bar (30) so as to rotate with the second exercise bar (30); a holder (243) including a plurality of angle adjustment holes (243a), formed on the front part of the main frame (10) to secure the securing pin (242) inserted into one of the angle adjustment holes (243a); and a connecting bar (245) connecting the first bracket (222) and the second bracket (232), and configured to transmit the rotational force of the second bracket (232) to the first bracket (222) so that the first and second exercise bars (20, 30) rotate with respect to their longitudinal central axes according to the rotation of the second bracket (232). Here, the angle adjustment holes (243a) are formed in the holder (243) at regular intervals along the path of movement of the securing pin (242) due to the rotation of the second bracket (232). One end of the connecting bar (245) is hinge-coupled to one end of the first bracket (222), and the other end of the connecting bar (245) is hinge-coupled to the lower part of the second bracket (232).

[0063] The first bracket (222) is configured as a flat plate formed horizontally inward, but its shape and size can be configured differently depending on the connection relationship of the second bracket (232) and the connecting bar (245) and their positions.

[0064] In the case of the second bracket (232), it is preferable that the angle between a virtual straight line connecting the central axis of the second exercise bar (30) and the securing pin (242), and a virtual straight line connecting the central axis of the second exercise bar (30) and the contact point (232a), is set to 90 degrees. The securing pin (242) is formed to the left of the central axis of the second exercise bar (30), and the contact point (232a) is formed below the central axis of the second exercise bar (30). Also, the distance (d) from the central axis of the first exercise bar (20) to the contact point (222a) is the same as the distance (d) from the central axis of the second exercise bar (30) to the contact point (232a).

[0065] The second bracket (232) includes an angle adjustment knob (242a) coupled to the securing pin (242), and the securing pin (242) can be attached to or detached from the angle adjustment hole (243a) by moving the angle adjustment knob (242a) up and down.

[0066] If the securing pin (242) is lifted to separate it from the current angle adjustment hole (243a), and the angle adjustment knob (242a) is moved upward or downward, the second bracket (232) rotates. When the second bracket (232) rotates to an appropriate angle, releasing the lifted securing pin (242) causes the securing pin (242) to enter another angle adjustment hole (243a), fixing the angle. By rotating the first and second exercise bars (20, 30) according to the rotation of the second bracket (232) in this way, the angle of each handle (21, 31) can be adjusted.

[0067] One end of the connecting bar (245) is hinge-coupled to the contact point (222a) of the first bracket (222), and the other end of the connecting bar (245) is hinge-coupled to the contact point (232a) of the second bracket (232). The positions of the contact points (222a, 232a) of the first and second brackets (222, 232) vary depending on the connection relationship of the first and second brackets (222, 232) and the connecting bar (245) and their positions.

[0068] Due to the rotation of the second bracket (232), the second exercise bar (20) rotates, and the connecting bar (245) moves in the upper left or lower right direction, rotating the first bracket (222) and the first exercise bar (30) together. In this way, due to the connection relationship and positions of the first and second brackets (222, 232) and the connecting bar (245), the first and second exercise bars (20, 30) rotate by the same angle in mutually opposite directions.Third Embodiment

[0069] FIG. 8 is a perspective view showing a part of a weight training apparatus according to a third embodiment of the present invention, and FIG. 9 is a front view of FIG. 8.

[0070] The weight training apparatus according to the third embodiment of the present invention is mostly the same as the first embodiment, including the main frame (10), first and second exercise bars (20, 30), first and second connecting brackets (50, 60), weight unit (70), third and fourth connecting bars (80, 90), and first and second stoppers (81, 91). However, the first and second brackets (322, 332) and the first and second holders (343, 344) differ from the first embodiment. Therefore, only the first and second brackets (322, 332) and the first and second holders (343, 344), which are different components of the third embodiment from the first embodiment, will be described.

[0071] The first and second brackets (322, 332) of the third embodiment rotate independently without interlocking with each other. As shown in FIGS. 8 and 9, the first bracket (322) includes a first securing pin (342a) and is fixedly coupled to one end of the first exercise bar (20) so as to rotate with the first exercise bar (20). The second bracket (332) includes a second securing pin (342b) and is fixedly coupled to one end of the second exercise bar (30) so as to rotate with the second exercise bar (30).

[0072] The first holder (343) includes a plurality of first angle adjustment holes (343a) and is formed on the front part of the main frame (10) to secure the first securing pin (342a) inserted into one of the first angle adjustment holes (343a). The second holder (344) includes a plurality of second angle adjustment holes (344a) and is formed on the front part of the main frame (10) to secure the second securing pin (342b) inserted into one of the second angle adjustment holes (344a). The first holder (343) and the second holder (344) are formed in parallel on the front part of the main frame (10) with a spacing between them.

[0073] The first angle adjustment holes (343a) are formed in the first holder (343) at regular intervals along the path of movement of the first securing pin (342a) due to the rotation of the first bracket (322), and the second angle adjustment holes (344a) are formed in the second holder (344) at regular intervals along the path of movement of the second securing pin (342b) due to the rotation of the second bracket (332).

[0074] The first exercise bar (20) rotates with respect to its longitudinal central axis according to the rotation of the first bracket (322), and the second exercise bar (30) rotates with respect to its longitudinal central axis according to the rotation of the second bracket (332).

[0075] The first and second brackets (322, 332) are configured as flat plates formed horizontally inward, but their shape and size can be configured differently. The first securing pin (342a) is formed to the right of the central axis of the first exercise bar (20), and the second securing pin (342b) is formed to the left of the central axis of the second exercise bar (30).

[0076] Furthermore, the first bracket (322) includes a first angle adjustment knob (342c) coupled to the first securing pin (342a), and the first securing pin (342a) can be attached to or detached from the first angle adjustment hole (343a) by moving the first angle adjustment knob (342c) up and down. If the first securing pin (342a) is lifted to separate it from the current angle adjustment hole (343a), and the first angle adjustment knob (342c) is moved upward or downward, the first bracket (322) rotates. When the first bracket (322) rotates to an appropriate angle, releasing the lifted first securing pin (342a) causes the first securing pin (342a) to enter another first angle adjustment hole (343a), fixing the angle. By individually rotating the first exercise bar (20) according to the rotation of the first bracket (322) in this way, the angle of the left handle (21) can be individually adjusted.

[0077] Similarly, the second bracket (332) includes a second angle adjustment knob (342d) coupled to the second securing pin (342b), and the second securing pin (342b) can be attached to or detached from the second angle adjustment hole (343b) by moving the second angle adjustment knob (342d) up and down. If the second securing pin (342b) is lifted to separate it from the current angle adjustment hole (343b), and the second angle adjustment knob (342d) is moved upward or downward, the second bracket (332) rotates. When the second bracket (332) rotates to an appropriate angle, releasing the lifted second securing pin (342b) causes the second securing pin (342b) to enter other second angle adjustment hole (343b), fixing the angle. By individually rotating the second exercise bar (30) according to the rotation of the second bracket (332) in this way, the angle of the right handle (31) can be individually adjusted.Fourth Embodiment

[0078] FIG. 10 is a perspective view showing a part of a weight training apparatus according to a fourth embodiment of the present invention, and FIG. 11 is a plan view of FIG. 10.

[0079] The weight training apparatus according to the fourth embodiment of the present invention is mostly the same as the first embodiment, including the main frame (10), first and second exercise bars (20, 30), first and second connecting brackets (50, 60), weight unit (70), third and fourth connecting bars (80, 90), and first and second stoppers (81, 91). However, it uses a plurality of gears (444, 445, 446, 447) instead of the exercise bar rotating unit (240) and first and second brackets (222, 232) of the first embodiment. Therefore, only the plurality of gears (444, 445, 446, 447) and the holder (443), which are different components of the fourth embodiment from the first embodiment, will be described.

[0080] The exercise bar rotating unit (440) of the fourth embodiment includes four gears (444, 445, 446, 447) to rotate the first and second exercise bars (20, 30) in mutually opposite directions with respect to their longitudinal central axes.

[0081] The first gear (444) is fixedly coupled to one end of the first exercise bar (20) so as to rotate with the first exercise bar (20), and the second gear (445) is fixedly coupled to one end of the second exercise bar (30) so as to rotate with the second exercise bar (30). At least the gear ratios or rotation ratios of the first and second gears (444, 445) must be the same, and the gear ratios or rotation ratios of the third and fourth gears (446, 447) must be the same.

[0082] The third and fourth gears (446, 447) are hinge-coupled to the front part of the main frame (10) between the first and second gears (444, 445) so as to be rotatable, and rotate around their respective central rotation axes. The first, second, third, and fourth gears (444, 445, 446, 447) are arranged in a row and rotate by meshing with each other using teeth formed on their respective outer circumferences. As at least one of the third and fourth gears (446, 447) rotates, the third and fourth gears (446, 447) transmit rotational force to the first and second gears (444, 445). In order for the first and second exercise bars (20, 30) to rotate by the same angle, it is preferable that the gear ratios or rotation ratios of the first and second gears (444, 445) are the same, and the gear ratios or rotation ratios of the third and fourth gears (446, 447) are the same.

[0083] The exercise bar rotating unit (440) of the fourth embodiment includes a holder (443), which is formed on the front part of the main frame (10) between the main frame (10) and the fourth gear (447). The holder (443) includes a plurality of angle adjustment holes and is formed to secure a securing pin (442) formed on at least one of the third and fourth gears (446, 447) by inserting it into one of the angle adjustment holes. The angle adjustment holes are formed in the holder (443) at regular intervals along the path of movement of the securing pin (442) due to the rotation of one of the third and fourth gears (446, 447).

[0084] At least one of the third and fourth gears (446, 447) includes a securing pin (442) and an angle adjustment knob (442a), and the securing pin (442) can be attached to or detached from the angle adjustment hole by moving the angle adjustment knob (442a) up and down.

[0085] When one of the third and fourth gears (446, 447) is rotated using the angle adjustment knob (442a), this rotational force is transmitted to the first and second gears (444, 445), and thus the first and second exercise bars (20, 30) rotate by the same angle in mutually opposite directions.Fifth Embodiment

[0086] FIG. 12 is a perspective view of a weight training apparatus according to a fifth embodiment of the present invention, viewed from the right side, and FIG. 13 is a perspective view of a weight training apparatus according to a fifth embodiment of the present invention, viewed from the left side.

[0087] As shown in FIGS. 12 and 13, the weight training apparatus according to the fifth embodiment of the present invention includes, as main components, a main frame (510), a seat (511), a backrest (512), first and second exercise bars (520, 530), an exercise bar rotating unit (540), an exercise bar angle adjustment unit (550), a swing angle adjustment unit (560), and a weight unit (570). Other components constituting the weight training apparatus may be further included, but the description will focus on the main components of the present invention.

[0088] The first and second exercise bars (520, 530) are configured for a user to push or pull with their legs while seated on the seat (511). They are formed to be rotatable left and right respectively with respect to first and second rotation axes (523, 533) of vertical direction, and rotatable up and down respectively with respect to third and fourth rotation axes (524, 534) of horizontal direction.

[0089] The first and second exercise bars (520, 530) are respectively coupled to first and second exercise bar support units (522, 532). As shown in FIG. 14, when the user pushes or pulls the first and second exercise bars (520, 530), the first and second exercise bars (520, 530) and the first and second exercise bar support units (522, 532) rotate up and down together with respect to the third and fourth rotation axes (524, 534).

[0090] FIG. 15 is a view showing a case where the left and right angles of the first and second exercise bars (520, 530) are set to 0 degrees by the exercise bar angle adjustment unit (550), FIG. 16 is a view showing a case where the left and right angles of the first and second exercise bars (520, 530) are set to 10 degrees by the exercise bar angle adjustment unit (550), and FIG. 17 is a view showing a case where the left and right angles of the first and second exercise bars (520, 530) are set to −10 degrees by the exercise bar angle adjustment unit (550).

[0091] As shown in FIGS. 15 to 17, the exercise bar rotating unit (540) rotates the first and second exercise bars (520, 530) in mutually opposite directions with respect to the first and second rotation axes (523, 533) to variously change the left and right angles (e.g., −10 degrees, 0 degrees, 10 degrees, 20 degrees, etc.) of the first and second exercise bars (520, 530). To this end, the exercise bar rotating unit (540) includes first and second brackets (541, 542), a connecting plate (544), and first and second connecting bars (547, 548).

[0092] The first and second brackets (541, 542) are coupled to the first and second rotation axes (523, 533) so as to be rotatable with respect to the first and second rotation axes (523, 533), and rotate the first and second exercise bars (522, 532) respectively with respect to the first and second rotation axes (523, 533). The connecting plate (544) is configured to rotate with respect to its central axis by the exercise bar angle adjustment unit (550).

[0093] The first and second connecting bars (547, 548) connect the first and second brackets (541, 542) to the connecting plate (544), and are configured to rotate the first and second brackets (541, 542) respectively with respect to the first and second rotation axes (523, 533) according to the rotation of the connecting plate (544). One end of the first connecting bar (547) is hinge-coupled to one end of the connecting plate (544), and the other end of the first connecting bar (547) is hinge-coupled to the first bracket (541). One end of the second connecting bar (548) is hinge-coupled to the other end of the connecting plate (544), and the other end of the second connecting bar (548) is hinge-coupled to the second bracket (542).

[0094] To minimize the angle deviation of the first and second exercise bars (520, 530) during left and right rotation, the distance between the central axis of the connecting plate (544) and the contact point (544a) with the first connecting bar (547) and the distance between the central axis of the connecting plate (544) and the contact point (544b) with the second connecting bar (548) are set differently. The contact point (544b) of the central axis of the connecting plate (544) and the second connecting bar (548) is located on a virtual straight line, and the contact point (544a) with the first connecting bar (547) is located at a different angle, not on the virtual straight line. The aforementioned virtual straight line is a straight line passing through the central axis of the connecting plate (544) in the longitudinal direction on the connecting plate (544).

[0095] The exercise bar angle adjustment unit (550) is configured to control the exercise bar rotating unit (540) to adjust the angle of the first and second exercise bars (520, 530). It includes a handle (551) for angle adjustment, a securing pin (552) for fixing the angle, and a holder (554) including a plurality of angle adjustment holes (554a). When the securing pin (552) is lifted to separate it from the current angle adjustment hole (554a), and then released, the securing pin (552) is pulled into another angle adjustment hole (554a) by an elastic material (not shown), and the angle is fixed.

[0096] In this way, by rotating the first and second brackets (541, 542), the connecting plate (544), and the first and second exercise bar support units (522, 532) using the exercise bar angle adjustment unit (550), the angle of the first and second exercise bars (520, 530) can be adjusted.

[0097] FIG. 18 is a view showing a seat (511) and a swing axis support unit (515) when a swing axis (514) and third and fourth rotation axes (524, 534) share a rotation axis, FIG. 19 is a view showing a seat (511) and a swing axis support unit (515) in a state where the position of the swing axis (514) is adjusted so that the distance between the swing axis (514) and the third and fourth rotation axes (524, 534) becomes farther, and FIG. 20 is a view showing a seat (511) and a swing axis support unit (515) in a state where the position of the swing axis (514) is adjusted so that the distance between the swing axis (514) and the third and fourth rotation axes (524, 534) is maximized.

[0098] The seat (511) and backrest (512) are configured to swing with respect to a horizontal swing axis (514) formed at the front of the seat (511). The swing axis support unit (515) is coupled to the main frame (510) to support the swing axis (514) and to adjust the position of the swing axis (514). The swing axis support unit (515) is configured to share the rotation axis between the swing axis (514) and the third and fourth rotation axes (524, 534) as shown in FIG. 18, or to adjust the position of the swing axis (514) so that the distance between the swing axis (514) and the third and fourth rotation axes (524, 534) changes, as shown in FIGS. 19 and 20. The swing axis support unit (515) includes a swing axis position adjustment unit (516) for variously changing and fixing the distance between the swing axis (514) and the third and fourth rotation axes (524, 534). The swing axis position adjustment unit (516) includes a plurality of holes (516a) formed on the side of the swing axis support unit (515) and a securing pin (516b). The position of the swing axis (514) changes according to the position of the hole (516a) to which the securing pin (516b) is coupled.

[0099] The swing angle adjustment unit (560) is configured to allow the swing of the seat (511) and backrest (512) or to adjust the inclination of the seat (511) and backrest (512). To this end, as shown in FIGS. 12 and 21, the swing angle adjustment unit (560) includes: a swing angle adjustment lever (561) for allowing free swing of the seat (511) and backrest (512) or fixing them at a certain angle; a securing bracket (563) coupled to the main frame (510) and including a plurality of holes (563a) for securing the swing angle adjustment lever (561); and an elastic member (565) formed between the main frame (510) and the backrest (512).

[0100] The swing angle adjustment lever (561) includes: a handle (561a), an adjustment pin (561b) for fixing the angle, a retainer (561c) for spacing and fixing the adjustment pin (561b), a first link (561d) coupled to the lower part of the swing angle adjustment lever (561), and an adjustment linker (561e) coupled between the seat (511) and the first link (561d) to compensate for the angle difference between the seat (511) and the first link (561d). When the adjustment pin (561b) is separated from the hole (563a), free swing is allowed. When the adjustment pin (561b) is inserted into the hole (563a), the seat (511) and backrest (512) are fixed at a certain angle (e.g., 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees).

[0101] If the locking operation of the retainer (561c) of the swing angle adjustment lever (561) separates and fixes the securing pin (516b) from the hole (563a) and thus free swing of the seat (511) and backrest (512) is allowed, the seat (511) and backrest (512) rotate together with respect to the swing axis (514) when the first and second exercise bars (520, 530) rotate up and down with respect to the third and fourth rotation axes (524, 534). Conversely, if the retainer (561c) of the swing angle adjustment lever (561) is unlocked, causing the securing pin (516b) to be inserted and fixed into the hole (563a), thereby fixing the seat (511) and backrest (512) at a certain angle, the seat (511) and backrest (512) do not rotate when the first and second exercise bars (520, 530) rotate up and down with respect to the third and fourth rotation axes (524, 534).

[0102] FIG. 22 and FIG. 23 are views for explaining free swing in a forward mode, and FIG. 24 and FIG. 25 are views for explaining free swing in a reverse mode.

[0103] The first and second swing connectors (581, 582) are hinge-coupled to the seat (511) and backrest (512), and the first and second swing brackets (585, 586) are coupled to the weight unit (570). The first and second swing brackets (585, 586) transmit rotational force to the first and second swing connectors (581, 582) during the up and down rotation of the weight plate support unit (571) interlocked with the first and second exercise bars (520, 530), causing the seat (511) and backrest (512) to rotate up and down in either forward or reverse mode.

[0104] Free swing proceeds in a selected mode, either forward mode or reverse mode. In the case of forward mode, as shown in FIG. 22, the inclination angle of the seat (511) is set to the highest (−5 degrees). At this time, the spring operates to relieve the load of the adjustment pin (561b) pressed by the user's body weight, allowing the swing angle adjustment lever (561) to be easily operated with a small force. Then, the first and second swing connectors (581, 582) are coupled to the rear holes (585a, 586a) of the first and second swing brackets (585, 586), and the adjustment pin (561b) is spaced apart from the securing bracket (563) and fixed by the retainer (561c). As shown in FIG. 23, when the first and second exercise bars (520, 530) are then lifted, the seat (511) moves from top to bottom, and when the first and second exercise bars (520, 530) are lowered, the seat (511) returns to its original position as shown in FIG. 22. At this time, since the adjustment pin (561b) is separated from the securing bracket (563), the swing angle adjustment lever (561) also swings with the seat (511).

[0105] In the case of reverse mode, as shown in FIG. 24, the inclination angle of the seat (511) is set to the lowest (−25 degrees). At this time, the spring operates to relieve the load of the adjustment pin (561b) pressed by the user's body weight, allowing the swing angle adjustment lever (561) to be easily operated with a small force. Then, the first and second swing connectors (581, 582) are coupled to the front holes (585b, 586b) of the first and second swing brackets (585, 586), and the adjustment pin (561b) is spaced apart from the securing bracket (563) and fixed by the retainer (561c). As shown in FIG. 25, when the first and second exercise bars (520, 530) are then lifted, the seat (511) moves from bottom to top, and when the first and second exercise bars (520, 530) are lowered, the seat (511) returns to its original position as shown in FIG. 24. At this time, since the adjustment pin (561b) is separated from the securing bracket (563), the swing angle adjustment lever (561) also swings with the seat (511).

[0106] FIG. 26 is a view showing an example of the first and second swing brackets (585, 586) configured integrally, and FIG. 27 is a view showing another example of the first and second swing brackets (585, 586) configured separately to move independently. FIG. 28 is a view showing an example of the first and second swing connectors (581, 582) coupled with the first and second swing brackets (585, 586) of FIG. 26, and FIG. 29 is a view showing another example of the first and second swing connectors (581, 582) coupled with the first and second swing brackets (585, 586) of FIG. 27.

[0107] As shown in FIG. 26, when the first and second swing connectors (581, 582) are configured integrally, as in FIG. 28, the first and second swing brackets (585, 586) are formed with different structures to secure space for simultaneous attachment and detachment of the first and second swing connectors (581, 582). Space for attaching and detaching the first swing connector (581) is provided at the front and rear ends of the first swing bracket (585). The first and second swing connectors (581, 582) are hinge-coupled to both sides of the seat support (513) that supports the seat (511) so as to be rotatable.

[0108] Furthermore, for attachment and detachment with the first and second swing connectors (581, 582) and the first and second swing brackets (585, 586), an elastic member (583) such as a spring is installed on the shaft for rotational coupling of the swing connectors (581, 582) with the seat inside at least one of the first and second swing connectors (581, 582), and a handle (not shown) that can be pulled is formed.

[0109] To allow the seat (511) and backrest (512) to rotate in forward or reverse directions, securing members such as rear holes (585a, 586a) and front holes (585b, 586b) are included on the left and right sides around the rotation axis of the first and second swing brackets (585, 586) so that the securing pins (587) of the first and second swing connectors (581, 582) can be secured.

[0110] To allow the seat (511) and backrest (512) to rotate in the forward direction, the left securing member, which is the front hole (585b, 586b), located on the left side around the rotation axis of the first and second swing brackets (585, 586), remains on the left side of the rotation axis even when the weight plate support unit (571) is lifted. To allow rotation in the reverse direction, the right securing member, which is the rear hole (585a, 586a), located on the right side around the rotation axis of the first and second swing brackets (585, 586), remains on the right side of the rotation axis even when the weight plate support unit (571) is lifted. To rotate from the forward to the reverse direction, when the left securing member, which is the front hole (585b, 586b), located on the left side around the rotation axis of the first and second swing brackets (585, 586), lifts the weight plate support unit (571) to a certain height, it moves to the right side.

[0111] As shown in FIG. 27, when the first and second swing connectors (581, 582) are configured to move individually, as in FIG. 29, the first and second swing brackets (585, 586) are formed with the same structure for individual attachment and detachment with the first and second swing connectors (581, 582). In this case, a pullable handle (584), a securing pin (587), and an elastic member (not shown) are further included inside the first and second swing connectors (581, 582) for attachment and detachment with the first and second swing connectors (581, 582) and the first and second swing brackets (585, 586).

[0112] When the first and second swing connectors (581, 582) are configured integrally, if the distance between the rotation center point of the first and second swing connectors (581, 582) and the left securing member of the first and second swing connectors (581, 582) is the same as the distance between the rotation center point of the first and second swing connectors (581, 582) and the right securing member of the first and second swing connectors (581, 582), it is configured in an I-shape. If the distance between the rotation center point of the first and second swing connectors (581, 582) and the left securing member of the first and second swing connectors (581, 582) is not the same as the distance between the rotation center point of the first and second swing connectors (581, 582) and the right securing member of the first and second swing connectors (581, 582), the first and second swing connectors (581, 582) are configured in a V-shape or W-shape.

[0113] The present invention is not limited by the above-described embodiments and accompanying drawings. Various modifications and applications are possible within the scope of the technical idea of the present invention, and it is also possible to replace components and change to equivalent other embodiments. Therefore, content related to variations and applications of the features of the present invention should be interpreted as being included within the scope of the present invention.

Claims

1. A weight training apparatus comprising:a main frame;first and second exercise bars hinge-coupled to one side of the main frame and configured for a user to push or pull using handles; andan exercise bar rotating unit configured to rotate the first and second exercise bars in mutually opposite directions with respect to their longitudinal central axes,wherein the exercise bar rotating unit includes:a connecting plate having a securing pin, hinge-coupled to the main frame between the first and second exercise bars so as to be rotatable;a holder including a plurality of angle adjustment holes, formed to secure the securing pin inserted into one of the angle adjustment holes; andfirst and second connecting bars connecting the first and second exercise bars to the connecting plate, and configured to rotate the first and second exercise bars respectively with respect to the central axes according to the rotation of the connecting plate.

2. The weight training apparatus of claim 1, wherein one end of the first connecting bar is hinge-coupled to an upper part of one end of the connecting plate, and the other end of the first connecting bar is hinge-coupled to a first bracket fixed to the first exercise bar, and one end of the second connecting bar is hinge-coupled to a lower part of one end of the connecting plate, and the other end of the second connecting bar is hinge-coupled to a second bracket fixed to the second exercise bar.

3. The weight training apparatus of claim 2, wherein an angle A of the first bracket inclined from a horizontal direction and an angle C of the second bracket inclined from the horizontal direction are the same angles facing each other, and the angle A and angle C are angles at which deviation is minimized when adjusting angles of the handles; and an angle B of the connecting plate, which is an angle between a virtual straight line connecting a rotation axis of the connecting plate and a contact point of the connecting plate and the first connecting bar, and a virtual straight line connecting the rotation axis of the connecting plate and a contact point of the connecting plate and the second connecting bar, is an angle at which deviation is minimized when adjusting angles of the handles.

4. The weight training apparatus of claim 1, further comprising:first and second connecting brackets respectively coupled to the first and second exercise bars so that a weight unit does not rotate together even if the first and second exercise bars rotate; andthird and fourth connecting bars respectively connecting the weight unit providing weight to the first and second connecting brackets,wherein the first and second connecting brackets are each an upper and lower pair with a certain distance, respectively, and each include one or more elongated holes, the elongated holes being in a shape of a sector arc sharing the longitudinal central axis of the first and second exercise bars, and their thickness is formed so that a securing pin of the first and second stoppers can be inserted; and the first and second stoppers have a certain thickness and are in the form of a hollow pipe, their length being so that they can be inserted between the upper and lower brackets of the first and second connecting brackets, and the securing pin of the first and second stoppers penetrates and is fixed through their center; andwherein spherical bearings that rotate in all directions (front, rear, left, right) are installed at both upper and lower ends of the third and fourth connecting bars, and are assembled with the first and second stoppers and the weight unit respectively.

5. A weight training apparatus comprising:a main frame;first and second exercise bars hinge-coupled to one side of the main frame and configured for a user to push or pull using handles; andan exercise bar rotating unit configured to rotate the first and second exercise bars in mutually opposite directions with respect to their longitudinal central axes,wherein the exercise bar rotating unit includes:a first bracket fixedly coupled to one end of the first exercise bar so as to rotate with the first exercise bar;a second bracket having a securing pin, fixedly coupled to one end of the second exercise bar so as to rotate with the second exercise bar;a holder including a plurality of angle adjustment holes, formed to secure the securing pin inserted into one of the angle adjustment holes; anda connecting bar connecting the first bracket and the second bracket, and configured to transmit a rotational force of the second bracket to the first bracket so that the first and second exercise bars rotate with respect to the central axes according to the rotation of the second bracket.

6. The weight training apparatus of claim 5, wherein a distance (d) from the central axis of the first exercise bar to a contact point of the first bracket and the connecting bar, and a distance (d) from the central axis of the second exercise bar to a contact point of the second bracket and the connecting bar, are lengths at which deviation of angles of the handles is minimized when adjusting the angles of the handles; the angle of the first bracket and the angle of the second bracket inclined from the horizontal direction are angles at which deviation is minimized when adjusting the angle of the handles; and one end of the connecting bar is hinge-coupled to one end of the first bracket, and the other end of the connecting bar is hinge-coupled to a lower part of the second bracket.

7. A weight training apparatus comprising:a main frame;first and second exercise bars hinge-coupled to one side of the main frame and configured for a user to push or pull using handles;a first bracket having a first securing pin, fixedly coupled to one end of the first exercise bar so as to rotate with the first exercise bar;a second bracket having a second securing pin, fixedly coupled to one end of the second exercise bar so as to rotate with the second exercise bar;a first holder including a plurality of first angle adjustment holes, formed to secure the first securing pin inserted into one of the first angle adjustment holes; anda second holder including a plurality of second angle adjustment holes, formed to secure the second securing pin inserted into one of the second angle adjustment holes,wherein the first exercise bar rotates with respect to its longitudinal central axis according to the rotation of the first bracket, and the second exercise bar rotates with respect to its longitudinal central axis according to the rotation of the second bracket.

8. A weight training apparatus comprising:a main frame;first and second exercise bars hinge-coupled to one side of the main frame and configured for a user to push or pull using handles; andan exercise bar rotating unit configured to rotate the first and second exercise bars in mutually opposite directions with respect to their longitudinal central axes,wherein the exercise bar rotating unit includes:a first gear fixedly coupled to one end of the first exercise bar so as to rotate with the first exercise bar;a second gear fixedly coupled to one end of the second exercise bar so as to rotate with the second exercise bar,third and fourth gears hinge-coupled to the main frame between the first and second gears so as to be rotatable, and configured to transmit rotational force to the first and second gears as they mesh and rotate; anda holder including a plurality of angle adjustment holes, formed to secure a securing pin formed on at least one of the third and fourth gears by inserting it into one of the angle adjustment holes.

9. A weight training apparatus comprising:a main frame;first and second exercise bars formed to be rotatable left and right respectively with respect to first and second rotation axes of vertical direction and rotatable up and down respectively with respect to third and fourth rotation axes of horizontal direction, and configured for a user to push or pull;an exercise bar rotating unit configured to rotate the first and second exercise bars in mutually opposite directions with respect to the first and second rotation axes; andan exercise bar angle adjustment unit configured to control the exercise bar rotating unit to adjust angles of the first and second exercise bars,wherein the exercise bar rotating unit includes:first and second brackets coupled to the main frame so as to be rotatable with respect to the first and second rotation axes, and configured to rotate the first and second exercise bars respectively with respect to the first and second rotation axes;a connecting plate rotating with respect to its central axis by the exercise bar angle adjustment unit; andfirst and second connecting bars connecting the first and second brackets to the connecting plate, and configured to rotate the first and second brackets respectively with respect to the first and second rotation axes according to the rotation of the connecting plate.

10. The weight training apparatus of claim 9, further comprising:a seat and a backrest configured to swing with respect to a swing axis;a swing axis support unit configured to support the swing axis, and to include a swing axis position adjustment unit to adjust a position of the swing axis so that the swing axis and the third and fourth rotation axes share a rotation axis or a distance between the swing axis and the third and fourth rotation axes is changed and fixed; anda swing angle adjustment unit configured to allow free swing of the seat and backrest or to fix them at a certain angle.

11. The weight training apparatus of claim 10, wherein the swing angle adjustment unit includes:a swing angle adjustment lever for allowing free swing of the seat and backrest or fixing them at a certain angle;a securing bracket coupled to the main frame for securing the swing angle adjustment lever; andan elastic member formed between the main frame and the backrest,wherein the swing angle adjustment lever includes: a handle, an adjustment pin for fixing an angle, a retainer for spacing and fixing the adjustment pin, a first link, and an adjustment linker for compensating for an angle difference between the seat and the first link.

12. The weight training apparatus of claim 10, further comprising:first and second swing connectors hinge-coupled to the seat and backrest so as to be rotatable and being an integral or separate type;first and second swing brackets configured to transmit rotational force to the first and second swing connectors during up and down rotation of a weight plate support unit interlocked with the first and second exercise bars, thereby causing the seat and backrest to rotate up and down in a forward or reverse direction.

13. The weight training apparatus of claim 12, wherein when the first and second swing connectors are configured integrally, the first and second swing brackets are formed with different structures to secure space for simultaneous attachment and detachment with the first and second swing connectors, and the first and second swing connectors are hinge-coupled to a seat support supporting the seat so as to be rotatable;wherein for attachment and detachment with the first and second swing connectors and the first and second swing brackets, an elastic member is installed on a shaft for rotational coupling of the first and second swing connectors with the seat inside at least one of the first and second swing connectors, and a handle that can be pulled is formed, and when the first and second swing connectors are configured to move individually, the first and second swing brackets are formed with the same structure for individual attachment and detachment with the first and second swing connectors;wherein for the seat and backrest to rotate in a forward or reverse direction, securing members are further included on left and right sides around rotation axes of the first and second swing brackets, so that the first and second swing connectors can be secured, andwherein for the seat and backrest to rotate in the forward direction, a left securing member, located on the left side around the rotation axis of the first and second swing brackets, remains on the left side of the rotation axis even if the weight plate support unit is lifted, and for rotation in the reverse direction, a right securing member, located on the right side around the rotation axis of the first and second swing brackets, remains on the right side of the rotation axis even if the weight plate support unit is lifted, and for rotation from the forward to the reverse direction, the left securing member, located on the left side around the rotation axis of the first and second swing brackets, moves to the right side when the weight plate support unit is lifted to a certain height.

14. The weight training apparatus of claim 13, wherein when the first and second swing connectors are configured integrally, if a distance between a rotation center point of the first and second swing connectors and the left securing member of the first and second swing connectors is the same as a distance between a rotation center point of the first and second swing connectors and the right securing member of the first and second swing connectors, it is configured in an I-shape, and if the distance between the rotation center point of the first and second swing connectors and the left securing member of the first and second swing connectors is not the same as the distance between the rotation center point of the first and second swing connectors and the right securing member of the first and second swing connectors, the first and second swing connectors are configured in a V-shape or W-shape.

15. The weight training apparatus of claim 9, wherein one end of the first connecting bar is hinge-coupled to an upper part of the connecting plate, and the other end of the first connecting bar is hinge-coupled to the first bracket, and one end of the second connecting bar is hinge-coupled to a lower part of the connecting plate, and the other end of the second connecting bar is hinge-coupled to the second bracket.

16. The weight training apparatus of claim 15, wherein to minimize an angle deviation of the first and second exercise bars during left and right rotation of the first and second exercise bars, a distance between a central axis of the connecting plate and a contact point with the first connecting bar and a distance between the central axis of the connecting plate and a contact point with the second connecting bar are set differently, and a contact point of the central axis of the connecting plate and the second connecting bar is located on a virtual straight line, and the contact point with the first connecting bar is located at a different angle, not on the virtual straight line.

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