Variable trajectory Smith machine

Abstract

The present invention specifically relates to a variable trajectory Smith machine, characterized in that the frame includes an upper crossbeam, a movable side bracket and a bottom frame, the movable side bracket is a frame-shaped structure, a vertical counterweight guide rod is arranged inside the movable side bracket, a sliding counterweight group is arranged on the counterweight guide rod, the bottoms of the two movable side brackets are respectively hinged on the bottom frame through pins, the upper ends of the two movable side brackets are respectively suspended on the upper crossbeam through movable pulleys, the upper crossbeam includes two symmetrical circular tracks, the upper end faces of the circular tracks are arc-shaped, the radius of the circular tracks is the same as the distance from the lower end face of the movable pulley to the corresponding movable side bracket bottom pin, the two circular tracks are provided with a plurality of symmetrical track locking holes, the upper parts of the two movable side brackets are provided with matching movable side bracket locking holes, the locking bolts pass through the movable side bracket locking holes and the track locking holes, and the upper ends of the movable side brackets are fixed on the circular tracks. The present invention has the advantages of reasonable structure, flexible and convenient use, multiple functions, and good training and rehabilitation effects.

Description

Technical Field

[0001] The invention belongs to the field of fitness and rehabilitation equipment, and in particular relates to a variable-trajectory Smith machine. Background Art

[0002] The Smith machine, also known as the Smith rack, is a common fitness and rehabilitation equipment. The two ends of its barbell are controlled by longitudinal tracks, and the sliding track is restricted. The safety factor is high, and the trainee can use heavy weights with confidence. Moreover, it is not only limited to squat training, but also can do bench press (incline, flat, decline), prone rowing, biceps curl and other barbell training.

[0003] In October 2019, the article "The Influence of Training Trajectory on Upper Limb Muscle Synergy" was published in Volume 38, Issue 5 of Beijing Biomedical Engineering, which disclosed the following conclusions: The training trajectory of the upper limbs has a certain influence on the characteristics of the upper limb muscles. The muscle synergy structure brought about by different training trajectories is relatively similar, but the proportion of flexor groups and the degree of synergy contribution will change during the exercise in order to coordinate the movement. It can be inferred that the training intensity of different muscle groups may be different for different training trajectories. The Smith machine of the prior art has its weight guide rods arranged vertically and in parallel, and the weights on the weight guide rods can only move vertically upward and downward, resulting in the inability to change the movement trajectory, and it cannot adapt to different movement training requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a variable-trajectory Smith machine, which can change the movement trajectory of upper limbs when used for exercise and rehabilitation, is suitable for different movement training needs, and improves the training effect.

[0005] The present invention is achieved through the following technical solutions:

[0006] That is a variable trajectory Smith machine, characterized in that it includes a frame, the frame includes an upper crossbeam, a movable side bracket and a bottom frame, the movable side bracket is a frame-shaped structure, a vertical counterweight guide rod is arranged inside it, a sliding counterweight group is arranged on the counterweight guide rod, the bottoms of the two movable side brackets are respectively hinged on the bottom frame through pins, the upper ends of the two movable side brackets are respectively suspended on the upper crossbeam through movable pulleys, the upper crossbeam includes two symmetrical circular tracks, the upper end faces of the circular tracks are arc-shaped, the radius of the circular tracks is the same as the distance from the lower end face of the movable pulley to the corresponding movable side bracket bottom pin, the two circular tracks are provided with a plurality of symmetrical track locking holes, the upper parts of the two movable side brackets are provided with matching movable side bracket locking holes, the locking bolts pass through the movable side bracket locking holes and the track locking holes, and the upper ends of the movable side brackets are fixed on the circular tracks.

[0007] When the movable side bracket of the present invention is in the vertical direction, the present invention has the same structure as the straight-bar Smith machine of the prior art, and a barbell bar is arranged between the two sliding counterweight groups. The motion trajectory when doing bench press (incline, flat, decline) is that the barbell bar makes a straight up and down straight overall motion.

[0008] After disassembling the middle barbell bar, the movable side brackets on the left and right sides are adjusted inwardly to a suitable angle together with the sliding counterweight group, so that the two movable side brackets form a state of being wider at the bottom and narrower at the top. The handles on the inner side of the sliding counterweight group are held by hand to perform up and down weight-bearing movements to achieve movement trajectory conversion and change the training intensity of different muscle groups.

[0009] After the barbell bar is disassembled, the invention can be used for training with both hands, and can also realize left and right alternating training or unilateral training.

[0010] When the movable side brackets of the present invention are tilted inward, the two movable side brackets can be tilted symmetrically or asymmetrically. When tilted asymmetrically, the present invention can perform unilateral multi-angle asymmetrical training.

[0011] Although the movable side bracket can also change the movement track by tilting to the outside, its safety is poor. The movable side bracket of the present invention is limited to tilting to the inside, and the tilt angle is adjusted according to the height and habits of the individual.

[0012] Furthermore, the sliding counterweight group of the present invention includes a base, a sliding handle is provided on the inner side of the base, and a bell rod is provided on the outer side. The sliding handle includes a handle main rod and a sliding handle cover. One end of the handle main rod is connected to the base through a bearing, and the hollow sliding handle cover is sleeved on the outside of the handle main rod. A sliding bearing or a sleeve is provided between the sliding handle cover and the handle main rod. A long sliding limit groove is provided on the side of the handle main rod, which passes through the rod body. A sliding limit pin is provided in the sliding limit groove. A handle cover end cover is provided at the outer end of the sliding handle cover. The handle cover end cover is threadedly connected to the sliding handle cover, and the handle cover end cover is provided with a through hole. The inner diameter of the through hole matches the outer diameter of the handle main rod and is smaller than the length of the sliding limit pin.

[0013] The sliding handle cover of the present invention is used for adjusting the length of the sliding handle and installing a barbell rod. A sliding bearing or a shaft sleeve is arranged between the sliding handle cover and the handle main rod. The sliding handle cover can slide smoothly left and right along the axial direction, thereby reducing friction resistance.

[0014] The sliding limit pin of the present invention has the following functions: 1) to limit the maximum sliding position of the sliding handle cover; 2) to prevent the sliding handle cover from axially rotating.

[0015] When the sliding handle cover slides outward, the sliding limit pin moves to the outermost end of the sliding limit groove, and when the sliding bearing or the sleeve touches the sliding limit pin, it can no longer slide outward; when the sliding handle cover slides inward, the sliding limit pin moves to the innermost end of the sliding limit groove, and when the handle cover end cover touches the sliding limit pin, it can no longer slide inward.

[0016] When the movable side bracket is vertical, both ends of the barbell rod are inserted into the sliding handle cover, and when the sliding handle cover moves to the outermost side, the inner end of the handle main rod is still at a certain distance from the inner end of the sliding handle cover, that is, no matter where the sliding handle cover slides to, the end of the barbell rod can be inserted into the sliding handle cover.

[0017] When the movable side bracket is tilted, the length of the sliding handle is not fixed, and the sliding handle can slide left and right along the handle main rod. When the sliding handle is held for training, the sliding handle follows a curved motion trajectory.

[0018] The bell plate rod of the present invention is used for installing bell plates (weight plates).

[0019] Furthermore, one or two handle main rods of the present invention extend to the outside of the base through the bearing on the base, and a safety hook is provided at the outer end thereof. A hook plate is provided on the vertical support of the corresponding movable side bracket, and a plurality of hook holes are provided on the hook plate from top to bottom.

[0020] Furthermore, the hook plate of the present invention and the vertical support column of the movable side support are an integrated structure, that is, the hook hole is provided on the vertical support column.

[0021] The sliding handle of the invention drives the safety hook to rotate, and the hook is inserted into the hook holes at different heights to change the position of the sliding counterweight group, and the sliding counterweight group is hung at a set height.

[0022] In order to more conveniently change the barbell bar, further, a sliding barbell bar is provided between the two sliding handles of the present invention, the sliding barbell bar comprises a rod body, symmetrical blind holes are provided at both ends of the rod body, a sliding inner shaft and a spring are respectively provided in the two blind holes, the sliding inner shaft is a variable diameter structure with a thin outside and a thick inside, the thick section of the sliding inner shaft is inserted into the blind hole, the outer diameter of the thick section matches the inner diameter of the blind hole, a limiting cap is provided at the front end of the blind hole, the limiting cap and the blind hole section are threadedly connected, a through hole is provided on the limiting cap, the inner diameter of the through hole is smaller than the outer diameter of the thick section of the sliding inner shaft, a sliding outer sleeve is provided at both ends of the rod body, the sliding outer sleeve is a variable diameter structure with a thin outside and a thick inside, the inner diameter of the thin section matches the outer diameter of the thin section of the sliding inner shaft, the outer diameter of the thin section matches the inner diameter of the sliding handle cover, the inner diameter of the thick section matches the outer diameter of the limiting cap, the outer ends of the sliding outer sleeve and the sliding inner shaft are inserted into the sliding handle cover, the inner end of the sliding outer sleeve is provided with a limiting ring, and the inner diameter of the limiting ring matches the outer diameter of the rod body.

[0023] The sliding barbell of the present invention is provided with sliding outer sleeves and sliding inner shafts at both ends. When the bar body is held and force is applied to one end, the bar body slides forward along the sliding inner shaft, and the total length is shortened. When the applied external force is reduced or disappears, the bar body is reset under the action of the spring, and the total length is restored to the initial value. The sliding barbell can be used to realize quick and convenient disassembly and assembly.

[0024] The present invention has the advantages of reasonable structure, flexible and convenient use, multiple functions, and good training and rehabilitation effects. When the present invention uses a barbell bar, it can realize the function of a traditional straight-bar Smith machine; after removing the middle barbell bar, the sliding counterweights on the left and right sides are adjusted inward to a suitable angle to form a lower wide and upper narrow state, and then combined with the left and right telescopic sliding of the sliding handle with variable length, the arbitrary conversion of the linear motion and the curved motion trajectory is realized, the training intensity of different muscle groups is changed, and the training and rehabilitation effects are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention after the barbell bar is disassembled;

[0026] Figure 2 for Figure 1 Schematic diagram of the planar structure;

[0027] Figure 3 It is a structural schematic diagram of the sliding matching group of the present invention;

[0028] Figure 4 for Figure 3 Schematic diagram of the planar structure;

[0029] Figure 5 It is a structural schematic diagram of the sliding handle of the present invention;

[0030] Figure 6 It is a three-dimensional exploded schematic diagram of the sliding handle of the present invention;

[0031] Figure 7 This is a schematic diagram of the three-dimensional structure of the present invention when the barbell bar is installed;

[0032] Figure 8 for Figure 7 Schematic diagram of the assembly structure of the middle sliding handle and the barbell bar;

[0033] Fig. 9 for Figure 8 Schematic diagram of the enlarged structure of part A in the middle.

[0034] As shown in the figure: 1. Base frame; 2. Counterweight guide rod; 3. Sliding counterweight group; 3-1. Weight plate rod; 3-2. Safety hook; 3-3. Base; 3-4. Sliding handle; 3-4-1. Handle main rod; 3-4-2. Sliding limit pin; 3-4-3. Sliding limit groove; 3-4-4. Sliding bearing; 3-4-5. Sliding handle cover; 3-4-6. Handle cover end cover; 4. Movable side bracket; 5. Track lock hole; 6. Circular track; 7. Moving pulley; 8. Upper crossbeam; 9. Hook plate; 10. Hook hole; 11. Sliding barbell rod; 11-1. Sliding inner shaft; 11-2. Sliding outer sleeve; 11-3. Spring; 11-4. Rod body; 11-5. Limit cap; 11-6. Limit ring; 11-7. Blind hole. DETAILED DESCRIPTION

[0035] The embodiments of the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and the protection scope of the present invention cannot be limited thereto. It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should be the common meanings understood by those skilled in the art to which the present invention belongs.

[0036] like Figure 1 , Figure 2 As shown: the two movable side brackets 4 are frame-shaped structures, the upper ends of which are suspended on the circumferential track 6 of the upper crossbeam 8 through the movable pulley 7, and the lower ends are hinged on the bottom frame 1 through the pin shaft. The upper end surface of the circumferential track 6 is arc-shaped, and the radius is the same as the distance from the lower end surface of the movable pulley 7 to the corresponding bottom pin shaft of the movable side bracket 4. The two circular tracks 6 are provided with a plurality of symmetrical track lock holes 5, and the upper parts of the two movable side brackets 4 are provided with matching movable side bracket lock holes. The locking bolts pass through the movable side bracket lock holes and the track lock holes 5 to fix the upper ends of the movable side brackets 4 on the circular tracks 6. Two vertical counterweight guide rods 2 are provided inside the movable side bracket 4, and a sliding counterweight group 3 is provided on the counterweight guide rod 2. A hook plate 9 is provided on the vertical support of one of the movable side brackets 4, and a plurality of hook holes 10 are vertically provided on the hook plate 9.

[0037] like Figure 3 , Figure 4 , Figure 5 , Figure 6As shown: the sliding counterweight group 3 includes a base 3-3, a sliding handle 3-4 is provided on the inner side of the base 3-3, a handle main rod 3-4-1 of the sliding handle 3-4 is installed on the base 3-3 through a bearing 3-5, a safety hook 3-2 and a bell rod 3-1 are provided on the outer side of the base 3-3, the safety hook 3-2 is connected to the handle main rod 3-4-1, a sliding handle cover 3-4-5 is sleeved on the outer side of the handle main rod 3-4-1, a sliding bearing 3-4-4 is provided therebetween, a sliding limit groove 3-4-3 in the shape of an elongated hole penetrating the rod body is provided on the side of the handle main rod 3-4-1, a sliding limit pin 3-4-2 is provided in the sliding limit groove 3-4-3, a handle cover end cover 3-4-6 is provided on the outer end of the sliding handle cover 3-4-5, and the handle cover end cover 3-4-6 is provided with a through hole, the inner diameter of the through hole matches the outer diameter of the handle main rod 3-4-1, and is smaller than the length of the sliding limit pin 3-4-2.

[0038] like Figure 7 , Figure 8 , Fig. 9 As shown: when the two movable side brackets 4 are in a vertical state, a sliding barbell rod 11 is arranged between the two sliding counterweight groups 3, and symmetrical blind holes 11-7 are arranged at both ends of the rod body 11-4 of the sliding barbell rod 11, and a sliding inner shaft 11-1 and a spring 11-3 are arranged in the two blind holes 11-7 respectively. The sliding inner shaft 11-1 is a variable diameter structure with a thin outer surface and a thick inner surface. The thick section of the sliding inner shaft 11-1 is inserted into the blind hole 11-7, and the outer diameter of the thick section matches the inner diameter of the blind hole 11-7. A limiting cap 11-5 is arranged at the front end of the blind hole 11-7, and the limiting cap 11-5 is threadedly connected to the blind hole section, and a through hole is arranged on the limiting cap 11-5. The inner diameter of the through hole is smaller than the outer diameter of the thick section of the sliding inner shaft 11-1. Both ends of the rod body 11-4 are covered with sliding outer sleeves 11-2. The sliding outer sleeve 11-2 is a variable diameter structure with a thin outer side and a thick inner side. The inner diameter of its thin section matches the outer diameter of the thin section of the sliding inner shaft 11-1, and the outer diameter of its thin section matches the inner diameter of the sliding handle cover 3-4-5. The inner diameter of its thick section matches the outer diameter of the limiting cap 11-5. The outer ends of the sliding outer sleeve 11-2 and the sliding inner shaft 11-1 are inserted into the sliding handle cover 3-4-5, and the inner end of the sliding outer sleeve 11-2 is provided with a limiting ring 11-6. The inner diameter of the limiting ring 11-6 matches the outer diameter of the rod body 11-4.

[0039] like Figure 7 As shown: when the two movable side brackets 4 are in the vertical direction, the structure of the straight-bar Smith machine of the present invention is the same as that of the prior art, a sliding barbell rod 11 is arranged between the two sliding counterweight groups 3, and the sliding handle 3-4 is rotated to disengage the safety hook 3-2 from the hook hole 10, so that the function of the traditional straight-bar Smith machine can be realized, and the motion trajectory when doing bench press (incline, flat, decline) is a straight up and down straight overall motion by sliding the barbell rod.

[0040] When installing the sliding barbell bar 11, first insert the sliding outer sleeve 11-2 and the sliding inner shaft 11-1 at one end thereof into the sliding handle cover 3-4-5 of the sliding handle 3-4 on the corresponding side, hold the rod body 11-4, apply force forward, and the rod body 11-4 slides forward a certain distance along the sliding inner shaft 11-1. At this time, the total length of the sliding barbell bar 11 is less than the distance between the two sliding handle covers 3-4-5. Align the sliding outer sleeve 11-2 and the sliding inner shaft 11-1 at the other end of the rod body 11-4 with the other sliding handle cover 3-4-5, loosen the rod body 11-4 or reduce the forward force of the rod body 1-4. Under the action of the spring 11-3, the sliding outer sleeve 11-2 and the sliding inner shaft 11-1 at the other end of the rod body 11-4 are automatically inserted into the sliding handle cover 3-4-5 on the corresponding side.

[0041] When the sliding barbell 11 needs to be disassembled, hold the rod body 11-4 and apply force forward. The rod body 11-4 slides forward a certain distance along the sliding inner shaft 11-1. At this time, the total length of the sliding barbell 11 is less than the distance between the two sliding handlebar gloves 3-4-5. The sliding outer sleeve 11-2 and the sliding inner shaft 11-1 at the other end of the rod body 11-4 are detached from the sliding handlebar gloves 3-4-5 on the corresponding side. The detached end is slightly tilted, and the rod body 11-4 can be pulled out from the other sliding handlebar gloves 3-4-5.

[0042] like Figure 1 , Figure 2 As shown: after disassembling the sliding barbell 11, unlock the locking bolts passing through the lock holes of the movable side brackets and the track lock holes 5, adjust the inclination angles of the two movable side brackets according to personal height and habits, and re-tighten the locking bolts after the angle adjustment. Hold the two sliding handles 3-4-5 with both hands at the same time or hold one of the sliding handles 3-4-5 with one hand in turn, and perform two-hand training or left-right alternating training or unilateral training, and the training is a curved motion trajectory.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the scope of the claims and specification of the present invention.

Claims

1. A variable trajectory Smith machine, characterized in that The frame includes an upper crossbeam, a movable side bracket and a bottom frame. The movable side bracket is a frame-shaped structure, a vertical counterweight guide rod is arranged inside the frame, and a sliding counterweight group is arranged on the counterweight guide rod. The bottoms of the two movable side brackets are respectively hinged on the bottom frame through pins, and the upper ends of the two movable side brackets are respectively suspended on the upper crossbeam through movable pulleys. The upper crossbeam includes two symmetrical circular tracks, the upper end faces of the circular tracks are arc-shaped, and the radius of the circular tracks is the same as the distance from the lower end face of the movable pulley to the corresponding bottom pin of the movable side bracket. The two circular tracks are provided with a plurality of symmetrical track locking holes, and the upper parts of the two movable side brackets are provided with matching movable side bracket locking holes, and locking bolts pass through the movable side bracket locking holes and the track locking holes to fix the upper ends of the movable side brackets on the circular tracks.

2. The variable trajectory Smith machine according to claim 1, characterized in that The sliding counterweight group includes a base, a sliding handle is provided on the inner side of the base, and a bell rod is provided on the outer side. The sliding handle includes a handle main rod and a sliding handle cover. One end of the handle main rod is connected to the base through a bearing, and the hollow sliding handle cover is sleeved on the outside of the handle main rod. A sliding bearing or a sleeve is provided between the sliding handle cover and the handle main rod. A long sliding limit groove is provided on the side of the handle main rod, which passes through the rod body. A sliding limit pin is provided in the sliding limit groove. A handle cover end cover is provided at the outer end of the sliding handle cover. The handle cover end cover is threadedly connected to the sliding handle cover. The handle cover end cover is provided with a through hole. The inner diameter of the through hole matches the outer diameter of the handle main rod and is smaller than the length of the sliding limit pin.

3. The variable trajectory Smith machine according to claim 2, characterized in that One or two handle main rods extend to the outside of the base through the bearing on the base, and a safety hook is arranged at the outer end thereof. A hook plate is arranged on the vertical support column of the corresponding movable side bracket, and a plurality of hook holes are arranged on the hook plate from top to bottom.

4. The variable trajectory Smith machine according to claim 3, characterized in that The hook plate and the vertical support of the movable side bracket are an integrated structure, that is, the hook hole is arranged on the vertical support.

5. The variable trajectory Smith machine according to claim 2, characterized in that A sliding barbell rod is provided between the two sliding handles, which includes a rod body. Both ends of the rod body are provided with symmetrical blind holes. A sliding inner shaft and a spring are respectively provided in the two blind holes. The sliding inner shaft is a variable-diameter structure with a thin outside and a thick inside. The thick section of the sliding inner shaft is inserted into the blind hole, and the outer diameter of the thick section matches the inner diameter of the blind hole. A limiting cap is provided at the front end of the blind hole. The limiting cap and the blind hole section are threadedly connected. A through hole is provided on the limiting cap. The inner diameter of the through hole is smaller than the outer diameter of the thick section of the sliding inner shaft. Both ends of the rod body are covered with sliding outer sleeves. The sliding outer sleeve is a variable-diameter structure with a thin outside and a thick inside. The inner diameter of its thin section matches the outer diameter of the thin section of the sliding inner shaft, the outer diameter of its thin section matches the inner diameter of the sliding handle cover, and the inner diameter of its thick section matches the outer diameter of the limiting cap. The outer ends of the sliding outer sleeve and the sliding inner shaft are inserted into the sliding handle cover, and a limiting ring is provided on the inner side of the inner end of the sliding outer sleeve, and the inner diameter of the limiting ring matches the outer diameter of the rod body.

Images