Back stretching machine

Abstract

The utility model provides a back stretching machine which comprises a base and a support fixed on the base, a seat is arranged above the base, two sets of power-assisted mechanisms are arranged on the support, each power-assisted mechanism comprises a power-assisted arm, a swing arm and a power-assisted pull rod, one end of each power-assisted arm is hinged to the support, and the other end of each power-assisted arm extends in the direction away from the support and is hinged to one end of the corresponding swing arm. One end of the power-assisted pull rod is hinged to the swinging arm, and the other end of the power-assisted pull rod is hinged to the support; the top of the support is hinged with two crosswise distributed tension arms, the top ends of the tension arms are provided with handles, the bottom ends of the tension arms are connected with the power-assisted arms through swing pull rods, one ends of the swing pull rods are hinged with the bottom ends of the tension arms, and the other ends are hinged with the power-assisted arms. The swing arm, the power-assisted arm and the power-assisted pull rod form a power-assisted mechanism capable of realizing force arm change, so that the starting difficulty of the pull-down action can be reduced, the training load can be ensured to meet the training effect, and a user can be better exercised.

Description

Technical Field

[0001] This utility model relates to the field of sports equipment technology, specifically to a latissimus dorsi stretching machine. Background Technology

[0002] A latissimus dorsi stretching machine is a fitness device used to strengthen back muscles and improve posture. This device consists of two handles or grips that can move in a scissor-like motion, allowing the user to exercise their back muscles by pulling on these handles. Through specific stretching movements, it effectively works the latissimus dorsi, rhomboids, trapezius, and other back muscle groups, thereby increasing muscle strength and endurance.

[0003] When using a latissimus dorsi stretching machine, the initial resistance is high, requiring the user to overcome inertia from a stationary position. At this point, the user's arms are extended, resulting in relatively low power output, necessitating significant effort to pull the machine. As the pull-down continues, the resistance gradually decreases, and the user's power output increases, making the pull feel easier than at the beginning. To facilitate a smooth start to the pull-down, a lighter load is needed. However, reducing the training load may lead to insufficient load for later training, affecting training effectiveness. Therefore, a trainer that can adjust its load according to the training movement is needed, reducing the difficulty of starting the pull-down without compromising later training results. Utility Model Content

[0004] To address the problems in the background art, this utility model proposes a latissimus dorsi stretching machine, including a base and a support fixed on the base. A seat is provided on one side of the support above the base. Two sets of assist mechanisms are provided on the support. Each assist mechanism includes an assist arm, a swing arm, and an assist rod. One end of the assist arm is hinged to the support, and the other end of the assist arm extends away from the support and is hinged to one end of the swing arm. The other end of the swing arm is provided with a barbell shaft. One end of the assist rod is hinged to the swing arm, and the other end of the assist rod is hinged to the support. The ends of the two assist arms that extend away from the support extend in opposite directions.

[0005] The top of the bracket is hinged with two cross-shaped tension arms. The top of the tension arms is provided with a handle. The bottom of the tension arms is connected to the assist arm through a swing rod. One end of the swing rod is hinged to the bottom of the tension arm, and the other end of the swing rod is hinged to the assist arm.

[0006] Preferably, the barbell shaft is located above the assist arm, the hinge point between the assist rod and the swing arm is located between the barbell shaft and the assist arm, the hinge point between the assist rod and the bracket is located above the hinge point between the assist arm and the bracket, and the hinge point between the swing rod and the assist arm is located between the bracket and the swing arm.

[0007] Preferably, two symmetrically distributed leg-pressing rollers are provided above the seat. One end of each leg-pressing roller is hinged to one end of a first connecting rod, and the other end of the first connecting rod is hinged to a bracket. The two first connecting rods are connected by a connecting rod.

[0008] A first adjustment plate is fixed on the bracket. The first adjustment plate is provided with a plurality of first adjustment holes. Each of the first connecting rods is provided with a first pin for inserting / disengaging from the first adjustment hole.

[0009] Preferably, a breast pad is provided above the leg press roller. The breast pad is connected to a mounting plate through a distance adjustment mechanism for adjusting the distance between the breast pad and the seat. A second connecting rod is hinged to each side of the mounting plate. The end of the second connecting rod away from the mounting plate is hinged to a bracket.

[0010] A second adjustment plate is fixed on the bracket. The second adjustment plate is provided with a plurality of second adjustment holes. Each of the second connecting rods is provided with a second pin for inserting / disengaging from the second adjustment hole.

[0011] Preferably, the distance adjustment mechanism includes a slide rod that is slidably connected to the mounting plate. The slide rod has multiple limiting holes, and any second connecting rod has a limiting pin for inserting into / disengaging from the limiting holes.

[0012] Preferably, one end of the first gas spring is hinged to any of the second connecting rods, and the other end of the first gas spring is hinged to the bracket.

[0013] Preferably, a third link is provided on each side of the seat, one end of the third link is hinged to the seat, and the other end of the third link is hinged to the bracket;

[0014] A third adjustment plate is fixed on the bracket, and the third adjustment plate is provided with multiple third adjustment holes. The seat is provided with a third pin for inserting / disengaging from the third adjustment holes.

[0015] The bottom of the seat is hinged to one end of the second gas spring, and the other end of the second gas spring is hinged to the bracket.

[0016] Preferably, the handle includes a first handle and a second handle, the second handle being located on the side of the first handle away from the seat, the handle ends of the two first handles being arranged in the front-back direction, and the handle ends of the two second handles being arranged in the left-right direction respectively.

[0017] Preferably, a curved frame is fixed to the side of the bracket away from the seat, and barbell placement shafts are fixed to both sides of the curved frame, with the ends of the two barbell placement shafts away from the curved frame tilting upwards.

[0018] Preferably, the bracket has two symmetrically arranged handles fixed on it, and the handles are located between the breast pad and the bracket.

[0019] Preferably, a support rod is fixed on the bracket, the support rod is located below the end of the assist arm with the swing arm, and a buffer pad is fixed on the top of the support rod.

[0020] Preferably, a pedal is fixed on the base, and the pedal is located below the seat.

[0021] The beneficial effects of this utility model are as follows:

[0022] This invention features an assistive mechanism that enables lever arm variation. The barbell plates are mounted on the swing arm of this mechanism. During training, the user pulls down the lever arm, which, via a swing rod, moves the assist arm upward. The swing arm, under the influence of the swing rod and the assist arm, rotates away from the support, lengthening the lever arm from the barbell plate to the hinge point. This increases the training resistance, allowing the training load to increase as the pull-down motion progresses. This invention reduces the difficulty of initiating the pull-down motion while ensuring the training load meets the desired effect, providing users with a better workout.

[0023] The chest pad, seat, and leg press rollers of this invention are all adjustable, which can meet the needs of trainees of different body types and improve the comfort of trainees. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present utility model. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the overall structure of the present utility model. Figure 2 ;

[0026] Figure 3 This is a side view of the present invention;

[0027] Figure 4 This is a front view of the present utility model;

[0028] Figure 5 This is a schematic diagram of the internal structure of the first pin of this utility model.

[0029] Labels in the diagram: 1. Base; 2. Bracket; 3. Seat; 4. Assist arm; 5. Swing arm; 6. Assist pull rod; 7. Barbell shaft; 8. Pull arm; 9. Leg press roller; 10. First connecting rod; 11. First adjusting plate; 12. First adjusting hole; 13. First pin; 14. Chest pad; 15. Mounting plate; 16. Second connecting rod; 17. Second adjusting plate; 18. Second adjusting hole; 19. Second pin; 20. Slide rod; 21. Limiting hole; 22. Limiting pin 23. First gas spring; 24. Third connecting rod; 25. Third adjusting plate; 26. Swinging rod; 27. Third pin; 28. Second gas spring; 29. ​​Fixed cylinder; 30. Pin head; 31. Adjusting handle; 32. Movable cavity; 33. Linkage rod; 34. Spring; 35. First handle; 36. Second handle; 37. Buffer block; 38. Bending frame; 39. Barbell placement axis; 40. Handle; 41. Support rod; 42. Buffer pad; 43. Pedal. Detailed Implementation

[0030] To make this utility model clearer and more understandable, the technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the given embodiments are only one of the implementation methods and do not represent all embodiments.

[0031] In this article, terms such as "front," "back," "up," "down," "left," "right," and "horizontal" are established based on the positional relationships shown in the attached drawings. Depending on the attached drawings, the corresponding positional relationships may also change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection.

[0032] Combined with appendix Figure 1 - Appendix Figure 5 A latissimus dorsi stretching machine includes a base 1 and a support 2 fixed on the base 1. A seat 3 is provided on one side of the support 2 above the base 1. The support 2 is provided with two sets of assist mechanisms, each assist mechanism including an assist arm 4, a swing arm 5, and an assist rod 6. One end of the assist arm 4 is hinged to the support 2, and the other end of the assist arm 4 extends away from the support 2 and is hinged to one end of the swing arm 5. The other end of the swing arm 5 is provided with a barbell shaft 7 for placing barbell plates. The barbell shaft 7 is located above the assist arm 4. One end of the assist rod 6 is hinged to the swing arm 5, and the other end of the assist rod 6 is hinged to the support 2. The hinge point between the assist rod 6 and the swing arm 5 is located between the barbell shaft 7 and the assist arm 4. The hinge point between the assist rod 6 and the support 2 is located above the hinge point between the assist arm 4 and the support 2. The two assist arms 4 extend in opposite directions away from the support 2.

[0033] The top of the bracket 2 is hinged with two cross-distributed tension arms 8. The top of the tension arms 8 is provided with a handle. The bottom of the tension arms 8 is connected to the assist arm 4 through a swing rod 26. One end of the swing rod 26 is hinged to the bottom of the tension arm 8, and the other end of the swing rod 26 is hinged to the assist arm 4. The hinge point between the swing rod 26 and the assist arm 4 is located between the bracket 2 and the swing arm 5.

[0034] Specifically, with reference to the position of the support 2, the seat plate is located on the front side of the support 2, the two assisting arms 4 are located on the left and right sides of the support 2 respectively, the ends of the two assisting arms 4 away from the support 2 extend to the left and right sides of the support 2 respectively, the hinge points of the two assisting arms 4 and the support 2 are coaxial, and the two barbell axes 7 are symmetrically distributed.

[0035] Specifically, two leg-pressing rollers 9 are symmetrically distributed on the upper part of the seat 3. One end of the leg-pressing roller 9 is hinged to one end of the first connecting rod 10, and the other end of the first connecting rod 10 is hinged to the bracket 2. The two first connecting rods 10 are connected by a connecting rod.

[0036] The bracket 2 is fixed with a first adjustment plate 11, which has a plurality of first adjustment holes 12. Each of the first connecting rods 10 is provided with a first pin 13 for inserting into / disengaging from the first adjustment hole 12.

[0037] When the first pin 13 disengages from the first adjustment hole 12, the leg press roller 9 can move up and down on the bracket 2 via the first connecting rod 10, thereby changing the position of the leg press roller 9. The first pin 13 moves with the first connecting rod 10, and multiple first adjustment holes 12 are spaced apart along the moving path of the first pin 13. When the leg press roller 9 moves to the desired position, the first pin 13 is inserted into the corresponding first adjustment hole 12, which fixes the leg press roller 9 relative to the bracket 2, thereby achieving the adjustment of the height position of the leg press roller 9, suitable for trainees of different body types.

[0038] Specifically, a breast pad 14 is provided above the leg press roller 9. The breast pad 14 is connected to a mounting plate 15 through a distance adjustment mechanism. The distance adjustment mechanism is used to adjust the distance between the breast pad 14 and the seat 3. A second connecting rod 16 is hinged to both sides of the mounting plate 15. The end of the second connecting rod 16 away from the mounting plate 15 is hinged to the bracket 2.

[0039] The bracket 2 is fixed with a second adjustment plate 17, which has a plurality of second adjustment holes 18. Each of the second connecting rods 16 is provided with a second pin 19 for inserting into / disengaging from the second adjustment hole 18.

[0040] When the second pin 19 disengages from the second adjustment hole 18, the chest pad 14 can move up and down on the support 2 via the second connecting rod 16, thereby changing the position of the chest pad 14. The second pin 19 moves along the second connecting rod 16. Multiple second adjustment holes 18 are arranged along the movement path of the second pin 19. When the chest pad 14 moves to the desired position, the second pin 19 is inserted into the corresponding second adjustment hole 18 to fix the chest pad 14 relative to the support 2, thereby realizing the adjustment of the height position of the chest pad 14 to meet the needs of trainees of different body types.

[0041] Specifically, the distance adjustment mechanism includes a slide rod 20, which is slidably connected to the mounting plate 15. The slide rod 20 has multiple limiting holes 21 arranged along the sliding direction of the slide rod 20. Each of the second connecting rods 16 has a limiting pin 22 for inserting / disengaging from the limiting hole 21. When it is necessary to adjust the distance between the breast pad 14 and the seat 3, the limiting pin 22 is disengaged from the limiting hole 21. At this time, the slide rod 20 can slide relative to the mounting plate 15, pulling or pushing the breast pad 14 to change the distance between the breast pad 14 and the seat 3. After the position of the breast pad 14 is confirmed, the limiting pin 22 is inserted into the corresponding limiting hole 21, fixing the slide rod 20 relative to the mounting plate 15, thus completing the adjustment of the breast pad 14.

[0042] Specifically, one end of the first gas spring 23 is hinged to any of the second connecting rods 16, and the other end of the first gas spring 23 is hinged to the bracket 2. The first gas spring 23 provides a certain degree of support for the second connecting rod 16.

[0043] Specifically, the seat 3 is provided with third connecting rods 24 on both sides. One end of the third connecting rod 24 is hinged to the seat 3, and the other end is hinged to the bracket 2. A third adjusting plate 25 is fixed on the bracket 2, and the third adjusting plate 25 is provided with multiple third adjusting holes. The seat 3 is provided with a third pin 27 for inserting / disengaging from the third adjusting holes. One end of a second gas spring 28 is hinged to the bottom of the seat 3, and the other end of the second gas spring 28 is hinged to the bracket 2. The seat 3 can achieve height adjustment through the cooperation of the third connecting rods 24, the third adjusting plate 25, the third adjusting holes, and the third pin 27. The height adjustment principle is the same as that of the height adjustment of the chest pad 14 and the leg press roller 9, and will not be described in detail here. The second gas spring 28 provides a certain degree of support for the seat 3.

[0044] More specifically, the structure and working principle of the first pin 13 are as follows: The first pin 13 includes a fixed cylinder 29, a pin head 30, and an adjusting handle 31. One end of the fixed cylinder 29 is provided with a movable cavity 32, and the other end is provided with a sliding hole communicating with the movable cavity 32. The diameter of the sliding hole is smaller than the diameter of the movable cavity 32, and the diameter of the sliding hole is smaller than the radial dimension of the pin head 30. The pin head 30 is slidably disposed in the movable cavity 32. A connecting rod 33 is fixed at the end of the pin head 30 near the sliding hole. The end of the connecting rod 33 away from the pin head 30 extends through the sliding hole to the outside of the fixed cylinder 29. The end of the connecting rod 33 located outside the fixed cylinder 29 is fixedly connected to the adjusting handle 31. The diameter of the sliding hole matches the outer diameter of the connecting rod 33. A spring 34 is sleeved on the outer wall of the sliding rod 20. The spring 34 is located in the movable cavity 32 between the pin head 30 and the sliding hole.

[0045] The fixed cylinder 29 is fixedly connected to the first connecting rod 10. The pin head 30 is located at the end of the first connecting rod 10 near the first adjusting hole 12. When the spring 34 is in its natural state, the pin head 30 extends outside the fixed cylinder 29. When the pin head 30 corresponds to the position of the first adjusting hole 12, the pin head 30 is inserted into the first adjusting hole 12. When it is necessary to disengage the pin head 30 from the first adjusting hole 12, simply pull the adjusting handle 31. The adjusting handle 31 pulls the pin head 30 into the fixed cylinder 29 through the connecting rod 33, and the pin head 30 disengages from the first adjusting hole 12. When the pin head 30 is inside the fixed cylinder 29, the spring 34 is compressed. When it is necessary to re-insert the pin head 30 into the first adjusting hole 12, simply align the pin head 30 with the desired position of the first adjusting hole 12, and then release the adjusting handle 31. After releasing the adjusting handle 31, the pin head 30 will move outside the fixed cylinder 29 under the elastic force of the spring 34.

[0046] It should be noted that the structure and working principle of the second pin 19, the third pin 27 and the limiting pin 22 are the same as those of the first pin 13, and will not be described in detail here.

[0047] Specifically, the handle includes a first handle 35 and a second handle 36. The second handle 36 is located on the side of the first handle 35 away from the seat 3. The handle ends of the two first handles 35 are arranged in the front-back direction, and the handle ends of the two second handles 36 are arranged in the left-right direction. The trainee can choose the handle or handle position to hold according to their body type or habits.

[0048] More specifically, the top of the tension arm 8 is bent from the bracket 2 toward the seat 3, that is, the top of the tension arm 8 is set in a horizontal direction. The first handle 35 is fixed to the top end of the tension arm 8, and the second handle 36 is fixed to the arm body of the horizontally set part of the tension arm 8. The two horizontally set parts of the two tension arms 8 are respectively provided with buffer blocks 37 on the side that are close to each other. The two buffer blocks 37 are in corresponding positions, and the buffer blocks 37 prevent the two tension arms 8 from being directly collided and damaged.

[0049] The handle ends of the two first handles 35 can be tilted to the left and right respectively, and the handle ends of the two second handles 36 can be tilted upward.

[0050] Specifically, a curved frame 38 is fixed to the side of the support 2 away from the seat 3, and barbell placement shafts 39 are fixed to both sides of the curved frame 38. The ends of the two barbell placement shafts 39 away from the curved frame 38 are inclined upwards. Empty barbell plates are placed on the barbell placement shafts 39 for easy access by the trainee.

[0051] Specifically, two symmetrically arranged handles 40 are fixed on the bracket 2, and the handles 40 are located between the breast pad 14 and the bracket 2.

[0052] More specifically, a support rod 41 is fixed on the bracket 2. The support rod 41 is located below the end of the assist arm 4 where the swing arm 5 is located, and a buffer pad 42 is fixed to the top of the support rod 41. The buffer pad 42 cushions the assist arm 4 and prevents the assist arm 4 from being damaged by direct collision with the bracket 2.

[0053] A pedal 43 is fixed on the base 1, and the pedal 43 is located below the seat 3.

[0054] Although embodiments of the present invention have been shown and described, those skilled in the art will be able to make various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A latissimus dorsi stretch machine characterized by: The utility model provides a gym equipment, including base (1) and fixed in base (1) on support (2), be equipped with seat (3) in the support (2) one side above base (1), be equipped with two groups of power assisting mechanism on support (2), power assisting mechanism includes power assisting arm (4), swing arm (5) and power assisting pull rod (6), power assisting arm (4) one end is hinged with support (2), power assisting arm (4) other end extends to the direction away from support (2) and is hinged with swing arm (5) one end, swing arm (5) other end is equipped with barbell shaft (7), power assisting pull rod (6) one end is hinged with swing arm (5), power assisting pull rod (6) other end is hinged with support (2), two power assisting arm (4) away from the direction of extension of support (2) one end is opposite; Support (2) top hinged two cross distribution's tension arm (8), tension arm (8) top end is equipped with handle, tension arm (8) bottom end is connected with power assisting arm (4) through swing pull rod (26), swing pull rod (26) one end is hinged with tension arm (8) bottom end, swing pull rod (26) other end is hinged with power assisting arm (4).

2. A latissimus dorsi stretching machine according to claim 1, wherein: Barbell shaft (7) is located power assisting arm (4) above, the hinged point of power assisting pull rod (6) and swing arm (5) is located between barbell shaft (7) and power assisting arm (4), the hinged point of power assisting pull rod (6) and support (2) is located power assisting arm (4) and the hinged point of support (2) above;The hinged point of swing pull rod (26) and power assisting arm (4) is located between support (2) and swing arm (5).

3. A lathe according to claim 1, wherein: The seat (3) is provided with two symmetrically distributed leg pressing rollers (9) above, one end of the leg pressing roller (9) is hinged to one end of the first connecting rod (10), the other end of the first connecting rod (10) is hinged to the support (2), and the two first connecting rods (10) are connected by a connecting rod. The first adjusting plate (11) is fixed on the support (2), a plurality of first adjusting holes (12) are arranged on the first adjusting plate (11), and a first pin (13) for inserting / detaching the first adjusting hole (12) is arranged on any first connecting rod (10).

4. A lathe according to claim 3, wherein: A chest pad (14) is arranged above the leg pressing roller (9), the chest pad (14) is connected with a mounting plate (15) through a distance adjusting mechanism for adjusting the distance between the chest pad (14) and the seat (3), second connecting rods (16) are hinged to both sides of the mounting plate (15), and one end of the second connecting rod (16) away from the mounting plate (15) is hinged to the support (2). The second adjusting plate (17) is fixed on the support (2), a plurality of second adjusting holes (18) are arranged on the second adjusting plate (17), and a second pin (19) for inserting / detaching the second adjusting hole (18) is arranged on any second connecting rod (16).

5. A lathe according to claim 4, wherein: The distance adjusting mechanism comprises a sliding rod (20), the sliding rod (20) is in sliding connection with the mounting plate (15), a plurality of limiting holes (21) are arranged on the sliding rod (20), and a limiting pin (22) for inserting / detaching the limiting hole (21) is arranged on any second connecting rod (16).

6. A lathe according to claim 4, wherein: One end of a first gas spring (23) is hinged to any of the second connecting rods (16), and the other end of the first gas spring (23) is hinged to the support (2).

7. A lathe according to claim 1, wherein: A third connecting rod (24) is arranged on each side of the seat (3), one end of the third connecting rod (24) is hinged to the seat (3), and the other end of the third connecting rod (24) is hinged to the support (2). A third adjusting plate (25) is fixed on the support (2), a plurality of third adjusting holes are arranged on the third adjusting plate (25), and a third bolt (27) for being inserted into or separated from the third adjusting hole is arranged on the seat (3). One end of a second gas spring (28) is hinged to the bottom of the seat (3), and the other end of the second gas spring (28) is hinged to the support (2).

8. The latissimus dorsi stretching machine of claim 1, wherein: The handle includes a first handle (35) and a second handle (36), the second handle (36) is located on the side of the first handle (35) away from the seat (3), the handle ends of the two first handles (35) are arranged in the front-rear direction, and the handle ends of the two second handles (36) are respectively arranged in the left-right direction.

9. The latissimus dorsi stretching machine of claim 1, wherein: A bent frame (38) is fixed on the side of the support (2) away from the seat (3), bent frame (38) is fixed on both sides of the barbell placing shaft (39), and the ends of the two barbell placing shafts (39) away from the bent frame (38) are inclined upward.

10. The latissimus dorsi stretching machine of claim 4, wherein: Two symmetrical handrails (40) are fixed on the support (2), and the handrails (40) are located between the chest pad (14) and the support (2).

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