Elliptical machine for strengthening leg exercise

Abstract

An elliptical machine for strengthening and exercising legs comprises a base, two connecting rod assemblies and two grab rails, a base rod and two vertical rods are arranged on the base, the two vertical rods are located on the rear side of the base rod, the tops of the two vertical rods are transversely and fixedly connected with a first shaft rod, a connecting rod is arranged between the first shaft rod and the upper portion of the base rod, and the connecting rod is connected with the grab rails. A second shaft rod is transversely and fixedly connected to the connecting rod, a stand column is connected to the top of the base rod, a third shaft rod is transversely and fixedly connected to the lower portion of the stand column, a belt wheel is arranged on the right side of the base rod, a rotating shaft penetrates through the upper portion of the base rod and penetrates through the belt wheel, and cranks are connected to the left end and the right end of the rotating shaft correspondingly; one side surface of the crank is connected with a pivot; a pedal connecting rod is pivoted to the front end of the connecting rod assembly, and a pedal connecting plate is pivoted to the upper portion of the pedal connecting rod; a rotatable flywheel is arranged on the base, and the belt pulley is in transmission connection with the flywheel. The leg exerciser can strengthen the exercise of different parts of the legs.

Description

Technical Field

[0001] The utility model relates to a sports training device, in particular to an elliptical machine for strengthening leg training. Background Art

[0002] The elliptical machine is a common cardiopulmonary fitness training tool and is also widely loved by users. Using the elliptical machine to exercise can not only prevent, reduce and relieve cervical spondylosis, periarthritis of the shoulder and upper back pain, but also avoid the impact force generated when running, better protect the joints, and thus have a better safety factor. The elliptical machine can combine arm and leg exercises, which can better coordinate the limbs and beautify the body. Long-term exercise can also improve physical endurance, exercise cardiopulmonary function, calm the mind, and improve athletic ability.

[0003] The existing elliptical machine includes a base frame and a flywheel arranged on the base frame, a vertical pole is arranged at the front of the base frame, handle bars are rotatably arranged on both sides of the vertical pole, pedals are rotatably arranged on the handle bars, a connecting rod is rotatably arranged on the flywheel, and the connecting rod is rotatably connected to the pedals. When people exercise on the elliptical machine, the pedals can only move in an elliptical track in the front and back directions, and cannot simultaneously achieve a span movement in the left and right directions in the direction of the elliptical track, so that the legs cannot be fully exercised. Utility Model Content

[0004] The utility model provides an elliptical machine for strengthening leg exercise, and its main purpose is to overcome the problem that the pedals of the existing elliptical machines can only move in elliptical tracks in the front and rear directions.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The elliptical machine for strengthening leg exercise comprises a base, two groups of connecting rod assemblies and two handrails, the two groups of connecting rod assemblies and the two handrails are all arranged on the left and right, the base is provided with a base rod and two vertical rods, the two vertical rods are arranged on the left and right and are located at the rear side of the base rod, the tops of the two vertical rods are transversely fixedly connected with a first shaft rod, a connecting rod is provided between the first shaft rod and the upper part of the base rod, the connecting rod is transversely fixedly connected with a second shaft rod, the top of the base rod is connected with a column, the lower part of the column is transversely fixedly connected with a third shaft rod, a pulley is provided on the right side of the base rod, a rotating shaft is passed through the upper part of the base rod, the rotating shaft passes through the pulley, the left and right ends of the rotating shaft are connected with cranks, and one side of the crank is connected with a pivot; the two groups of connecting rod assemblies each comprise a first A swing arm, a first connecting rod, a link rod, a second connecting rod and a second swing arm, the two handrail rods are pivoted to the left and right ends of the third shaft rod respectively, the rear end of the first swing arm is pivoted to the end of the second shaft rod, the front end of the first swing arm is pivoted to the top of the first connecting rod, one end of the pivot extends into the middle part of the first connecting rod, the rear end of the link rod is pivoted to one end of the pivot, the front end of the link rod is pivoted to the bottom of the handrail rod, the bottom of the first connecting rod is pivoted to the middle part of the second connecting rod, the top of the second swing arm is pivoted to the end of the first shaft rod, the bottom of the second swing arm is pivoted to the rear end of the second connecting rod, the front end of the second connecting rod is pivoted to a pedal connecting rod, and the upper part of the pedal connecting rod is pivoted to a foot connecting plate; a rotatable flywheel is provided on the base, and the pulley is transmission connected to the flywheel.

[0007] Furthermore, the utility model also includes two rocking links and two parallel rods, each rocking link and each parallel rod corresponds to a group of link assemblies, the rear end of the rocking link is pivoted to the lower part of the first link, the front end of the rocking link is pivoted to the rear part of the pedal link, the rear end of the parallel rod is pivoted to the front part of the second link, and the front end of the parallel rod is pivoted to the bottom of the footrest connecting plate.

[0008] Furthermore, both ends of the second shaft rod are provided with a first step shaft section, the top of the first connecting rod is provided with a fourth shaft rod, the front and rear ends of the first swing arm are respectively provided with a first front pivot sleeve and a first rear pivot sleeve, the first rear pivot sleeve is provided with a first step hole that passes through the left and right sides, the first step shaft section extends into the first step hole, the first step shaft section is provided with a first threaded hole, the first step hole is provided with a first gasket, a first washer and a first screw, the first screw passes through the first washer and the first gasket in sequence and is threadedly connected to the first threaded hole, the end of the fourth shaft rod is provided with a second step shaft section, the first front pivot sleeve is provided with a second step hole that passes through the left and right sides, the second step shaft section extends into the second step hole, the second step shaft section is provided with a second threaded hole, the second step hole is provided with a second gasket, a second washer and a second screw, the second screw passes through the second gasket and the second gasket in sequence and is threadedly connected to the second threaded hole.

[0009] Furthermore, a first bearing sleeve is provided at the middle part of the first connecting rod, a first bearing is provided in the first bearing sleeve, a third step shaft section is provided at the end of the pivot, a second front pivot sleeve and a second rear pivot sleeve are provided at the front and rear ends of the connecting rod respectively, the second rear pivot sleeve is provided with a third step hole which passes through the left and right sides, the end of the second rear pivot sleeve is located in the first sleeve, the third step shaft section passes through the first bearing and extends into the third step hole, the third step shaft section is provided with a third threaded hole, a third gasket, a third washer and a third screw are provided in the third step hole, and the third screw passes through the The third washer and the third gasket are threadedly connected to the third threaded hole, and a first opening piece is provided at the bottom of the handrail rod, and the second front pivot sleeve is located in the first opening piece, and a second bearing is provided in the second front pivot sleeve, and a first half-tooth bolt is provided on the first opening piece, and the first half-tooth bolt passes through the second bearing, and a second bearing sleeve is provided in the middle part of the second connecting rod, and a third bearing is provided in the second bearing sleeve, and a second opening piece is provided at the bottom of the first connecting rod, and the middle part of the second connecting rod is located in the second opening piece, and a second half-tooth bolt is provided on the second opening piece, and the second half-tooth bolt passes through the third bearing.

[0010] Furthermore, an upper pivot sleeve and a lower pivot sleeve are respectively provided at the top and bottom of the second swing arm, a fourth bearing, a fourth gasket, a fourth washer and a fourth screw are provided in the upper pivot sleeve, a fourth step shaft section is provided at the end of the first shaft rod, the fourth step shaft section is provided with a fourth threaded hole, the fourth step shaft section passes through the fourth bearing, and the fourth screw passes through the fourth gasket and the fourth gasket in sequence and is threadedly connected to the fourth threaded hole, a third opening piece is provided at the rear end of the second connecting rod, a fifth bearing is provided in the lower pivot sleeve, a third half-tooth bolt is provided on the third opening piece, and the third half-tooth bolt passes through the fifth bearing, a first sleeve is provided at the front end of the second connecting rod, a pivot piece is provided at the rear end of the pedal connecting rod, a first rotating shaft is provided at the rear end of the pivot piece, the first rotating shaft is located in the first sleeve, a second sleeve is provided at the front end of the pedal connecting rod, a second rotating shaft is provided on the pedal connecting plate, and the second rotating shaft is located in the second sleeve.

[0011] Furthermore, a handrail pivot sleeve is provided at the lower middle portion of the handrail rod, a fifth step shaft section is provided at the end of the third shaft rod, the fifth step shaft section is provided with a fifth threaded hole, a sixth bearing, a fifth gasket, a fifth washer and a fifth screw are provided in the handrail pivot sleeve, the fifth step shaft section passes through the sixth bearing, and the fifth screw passes through the fifth gasket and the fifth gasket in sequence and is threadedly connected to the fifth threaded hole.

[0012] Furthermore, the lower side surface of the first connecting rod is provided with two first connecting ears arranged up and down, a third shaft sleeve is provided between the two first connecting ears, a fifth shaft rod is connected between the two first connecting ears, the fifth shaft rod is located in the third shaft sleeve, a sixth shaft rod is provided on the side of the third shaft sleeve, a sixth step shaft section is provided at the end of the sixth shaft rod, the sixth step shaft section is provided with a sixth threaded hole, a rocking pivot sleeve is provided at the rear end of the rocking connecting rod, a seventh bearing, a sixth gasket, a sixth washer and a sixth screw are provided in the rocking pivot sleeve, the sixth step shaft section is inserted into the seventh bearing, the sixth screw is threadedly connected to the sixth threaded hole through the sixth gasket and the sixth gasket in turn, the front end of the rocking connecting rod is threadedly connected with a fisheye rod end bearing, the pivot member is provided with a transverse fixing rod, the end of the fixing rod is provided with a fourth opening member, the bearing portion of the fisheye rod end bearing is located in the fourth opening member, a fourth half-tooth bolt is provided in the fourth opening member, and the fourth half-tooth bolt passes through the bearing portion of the fisheye rod end bearing.

[0013] Furthermore, a second connecting ear is provided on the front end side of the second connecting rod, and a seventh shaft rod facing downwards is provided on the second connecting ear, and a rear parallel pivot sleeve is provided at the rear end of the parallel rod, and the seventh shaft rod passes through the rear parallel pivot sleeve, and a seventh threaded hole is provided at the bottom of the seventh shaft rod, and a seventh gasket, a seventh washer and a seventh screw are provided below the bottom of the seventh shaft rod, and the seventh screw passes through the seventh gasket and the seventh gasket in sequence and is threadedly connected to the seventh threaded hole, and a front parallel pivot sleeve is provided at the front end of the parallel rod, and an eighth shaft rod facing downwards is provided on the pedal connecting plate, and the eighth shaft rod passes through the front parallel pivot sleeve, and an eighth threaded hole is provided at the bottom of the eighth shaft rod, and an eighth gasket, an eighth washer and an eighth screw are provided below the bottom of the eighth shaft rod, and the eighth screw passes through the eighth gasket and the eighth gasket in sequence and is threadedly connected to the eighth threaded hole.

[0014] Furthermore, the rear end top of the pivot member has an extension portion extending backward, an eighth bearing is provided between the top of the first sleeve and the bottom of the extension portion, the top of the first rotating shaft passes through the top surface of the extension portion, the top outer periphery of the first rotating shaft is provided with a first keyway, the top surface of the extension portion is provided with a first stop washer, a first round nut and a plurality of ninth gaskets, the plurality of ninth gaskets are arranged up and down and are located on the top surface of the extension portion, the plurality of ninth gaskets, the first stop washer and the first round nut are arranged in sequence from bottom to top, the top of the first rotating shaft passes through a plurality of ninth gaskets, the first stop washer and the first round nut in sequence and is threadedly connected to the first round nut, the first stop washer has a first inner claw and a plurality of first outer claws, the first inner claw is clamped in the first keyway, the first round nut has a plurality of first slots, each first slot is for a first outer claw to be bent and clamped into.

[0015] Furthermore, the bottom of the second rotating shaft extends out of the bottom surface of the second sleeve, and the outer periphery of the bottom of the second rotating shaft is provided with a second keyway, and the bottom surface of the second sleeve is provided with a second stopping washer, a second round nut and a plurality of tenth washers, and the plurality of tenth washers are arranged up and down and are located on the bottom surface of the second sleeve, and the plurality of tenth washers, the second stopping washers and the second round nut are arranged in sequence from top to bottom, and the bottom of the second rotating shaft passes through the plurality of tenth washers, the second stopping washers and the second round nut in sequence and is threadedly connected with the second round nut, and the second stopping washer has a second inner claw and a plurality of second outer claws, and the second inner claw is clamped in the second keyway, and the second round nut has a plurality of second clamping grooves, and each second clamping groove is for a second outer claw to be bent and clamped into.

[0016] From the above description of the utility model, it can be seen that compared with the prior art, the utility model has the following advantages: when the elliptical machine is pedaled, the first swing arm, the first connecting rod, the connecting rod, the second connecting rod, the second swing arm and the handrail rod swing synchronously to move in an elliptical trajectory, the first connecting rod drives the pulley to rotate through the pivot and the crank when swinging, and the pulley then drives the flywheel to rotate, the pedal connecting rod can rotate left and right relative to the second connecting rod, and the foot pedal connecting plate can also rotate relative to the pedal connecting rod, so the foot pedal connecting plate can also swing left and right while the connecting rod assembly moves in an elliptical trajectory, thereby strengthening the exercise of different parts of the legs; in addition, the multi-link structure design of the connecting rod assembly ensures that no dead point will be generated when making an elliptical motion trajectory, the connecting rod assembly is smoother when swinging, and the handrail rod is connected through a pivot and a crank, which can produce an assisting driving function when driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model.

[0018] Figure 2 It is a structural exploded view of the utility model.

[0019] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0020] Figure 4 for Figure 2 A diagram of the structure from another angle.

[0021] Figure 5 This is a connection structure diagram of the pedal connecting rod and the pedal connecting plate of the utility model.

[0022] Figure 6 for Figure 5 Structural breakdown diagram. DETAILED DESCRIPTION

[0023] Reference Figure 1An elliptical machine for strengthening leg exercise comprises a base 1, two groups of connecting rod assemblies and two handrails 2, wherein the two groups of connecting rod assemblies and the two handrails 2 are arranged on the left and right sides. The base 1 is provided with a base rod 3 and two vertical rods 4, wherein the two vertical rods 4 are arranged on the left and right sides and are located at the rear side of the base rod 3, wherein the tops of the two vertical rods 4 are transversely fixedly connected with a first shaft rod 5, wherein a connecting rod 6 is provided between the first shaft rod 5 and the upper part of the base rod 3, wherein the connecting rod 6 is transversely fixedly connected with a second shaft rod 7, wherein the top of the base rod 3 is connected with a column 8, wherein the lower part of the column 8 is transversely fixedly connected with a third shaft rod 9. A pulley 10 is provided on the right side of the base rod 3, wherein a rotating shaft 11 is provided on the upper part of the base rod 3, wherein the rotating shaft 11 passes through the pulley 10, wherein the left and right ends of the rotating shaft 11 are connected with cranks 12, wherein a side of the crank 12 is connected with a pivot 13. The two groups of connecting rod assemblies each include a first swing arm 14, a first connecting rod 15, a connecting rod 16, a second connecting rod 17 and a second swing arm 18. The two handrail rods 2 are respectively pivoted to the left and right ends of the third shaft rod 9. The rear end of the first swing arm 14 is pivoted to the end of the second shaft rod 7. The front end of the first swing arm 14 is pivoted to the top of the first connecting rod 15. One end of the pivot 13 extends into the middle of the first connecting rod 15. The rear end of the connecting rod 16 is pivoted to one end of the pivot 13. The front end of the connecting rod 16 is pivotally connected to the bottom of the handrail 2, the bottom of the first connecting rod 15 is pivotally connected to the middle of the second connecting rod 17, the top of the second swing arm 18 is pivotally connected to the end of the first shaft rod 5, the bottom of the second swing arm 18 is pivotally connected to the rear end of the second connecting rod 17, the front end of the second connecting rod 17 is pivotally connected to a pedal connecting rod 19, the upper part of the pedal connecting rod 19 is pivotally connected to a pedal connecting plate 20, and the top surface of the pedal connecting plate 20 is used to connect the pedal. A rotatable flywheel 21 is provided on the base 1, and the pulley 10 is connected to the flywheel 21 through a belt transmission.

[0024] Reference Figure 1 The utility model further comprises two rocking links 22 and two parallel rods 23, each rocking link 22 and each parallel rod 23 corresponding to a set of link assemblies. The rear end of the rocking link 22 is pivotally connected to the lower part of the first link 15, the front end of the rocking link 22 is pivotally connected to the rear part of the pedal link 19, the rear end of the parallel rod 23 is pivotally connected to the front part of the second link 17, and the front end of the parallel rod 23 is pivotally connected to the bottom of the pedal connecting plate 20.

[0025] Reference Figures 1 to 4, both ends of the second shaft rod 7 are provided with a first step shaft section 71, the top of the first connecting rod 15 is provided with a fourth shaft rod 24, the front and rear ends of the first swing arm 14 are respectively provided with a first front pivot sleeve 141 and a first rear pivot sleeve 142, the first rear pivot sleeve 142 is provided with a first step hole 143 that passes through the left and right sides, the first step shaft section 71 extends into the first step hole 143, the first step shaft section 71 is provided with a first threaded hole 72, the first step hole 143 is provided with a first gasket 144, a first gasket 145 and a first screw 146, the first screw 146 passes through the first gasket 145 and the first gasket 144 in sequence and is threadedly connected to the first threaded hole 72, specifically, the first step hole 143 is also provided with a first Igus shaft sleeve, and the first step shaft section 71 is located in the first Igus shaft sleeve. The end of the fourth shaft rod 24 is provided with a second step shaft section 241, the first front pivot sleeve 141 is provided with a second step hole 147 that passes through from left to right, the second step shaft section 241 extends into the second step hole 147, the second step shaft section 241 is provided with a second threaded hole 242, the second step hole 147 is provided with a second gasket 148, a second gasket 149 and a second screw 140, the second screw 140 passes through the second gasket 149 and the second gasket 148 in sequence and is threadedly connected with the second threaded hole 242, specifically, the second step hole 147 is also provided with a second Igus shaft sleeve, and the second step shaft section 241 is located in the second Igus shaft sleeve. The above structural design allows the first swing arm 14 to swing relative to both the second shaft rod 7 and the first connecting rod 15.

[0026] Reference Figures 1 to 3A first bearing sleeve 151 is provided in the middle of the first connecting rod 15, a first bearing 152 is provided in the first bearing sleeve 151, a third step shaft section 131 is provided at the end of the pivot 13, a second front pivot sleeve 161 and a second rear pivot sleeve 162 are provided at the front and rear ends of the connecting rod 16, respectively, the second rear pivot sleeve 162 is provided with a third step hole 163 which passes through the left and right sides, the end of the second rear pivot sleeve 162 close to the first connecting rod 15 is located in the first sleeve 151, the third step shaft section 131 passes through the first bearing 152 and extends into the third step hole 163. The third step shaft section 131 is provided with a third threaded hole 132. The third step hole 163 is provided with a third gasket 164, a third washer 165 and a third screw 166. The third screw 166 passes through the third washer 165 and the third gasket 164 in sequence and is threadedly connected to the third threaded hole 132. Specifically, the third step hole 163 is also provided with a third Igus bushing, and the third step shaft section 131 is located in the third Igus bushing. The bottom of the handrail 2 is provided with a first opening member 25, and the second front pivot bushing 161 is located in the first opening member 25. A second bearing 167 is provided in the second front pivot sleeve 161, a first half-thread bolt 251 is provided on the first opening member 25, the first half-thread bolt 251 passes through the second bearing 167, a smooth section of the first half-thread bolt 251 is located in the second bearing 167, and a threaded section of the first half-thread bolt 251 is locked and connected with a nut located on the side of the first opening member 25. A second bearing sleeve 171 is provided in the middle of the second connecting rod 17, a third bearing 172 is provided in the second bearing sleeve 171, a second opening member 26 is provided at the bottom of the first connecting rod 15, the middle of the second connecting rod 17 is located in the second opening member 26, a second half-thread bolt 261 is provided on the second opening member 26, the second half-thread bolt 261 passes through the third bearing 172, a smooth section of the second half-thread bolt 261 is located in the third bearing 172, and a threaded section of the second half-thread bolt 261 is locked and connected with a nut located on the side of the second opening member 26. The above structural design enables the linkage rod 16 to swing relative to both the first link rod 15 and the handrail rod 2 , and the first link rod 15 to swing relative to the second link rod 17 .

[0027] Reference Figures 1 to 3The top and bottom of the second swing arm 18 are respectively provided with an upper pivot sleeve 181 and a lower pivot sleeve 182, and the upper pivot sleeve 181 is provided with a fourth bearing 183, a fourth gasket 184, a fourth washer 185 and a fourth screw 186. The end of the first shaft rod 5 is provided with a fourth step shaft section 51, and the fourth step shaft section 51 is provided with a fourth threaded hole 52. The fourth step shaft section 51 passes through the fourth bearing 183, and the fourth screw 186 passes through the fourth gasket 185 and the fourth gasket 184 in sequence and is threadedly connected with the fourth threaded hole 52. The rear end of the second connecting rod 17 is provided with a third opening piece 27, the lower pivot sleeve 182 is provided with a fifth bearing 187, the third opening piece 27 is provided with a third half-thread bolt 271, the third half-thread bolt 271 passes through the fifth bearing 187, the smooth section of the third half-thread bolt 271 is located in the fifth bearing 187, and the threaded section of the third half-thread bolt 271 is locked and connected with a nut located on the side of the third opening piece 27. The front end of the second connecting rod 17 is provided with a first sleeve 173, the rear end of the pedal connecting rod 19 is provided with a pivot piece 28, the rear end of the pivot piece 28 is provided with a first rotating shaft 281, the first rotating shaft 281 is located in the first sleeve 173, the front end of the pedal connecting rod 19 is provided with a second sleeve 191, the pedal connecting plate 20 is provided with a second rotating shaft 201, and the second rotating shaft 201 is located in the second sleeve 191. The above structural design enables the second swing arm 18 to swing relative to the first shaft rod 5 and the second connecting rod 17 , the pedal connecting rod 19 to swing relative to the second connecting rod 17 , and the pedal connecting plate 20 to swing relative to the pedal connecting rod 19 .

[0028] Reference Figures 1 to 4 The middle and lower part of the handrail bar 2 is provided with a handrail pivot sleeve 29, the end of the third shaft rod 9 is provided with a fifth step shaft section 91, the fifth step shaft section 91 is provided with a fifth threaded hole 92, the handrail pivot sleeve 29 is provided with a sixth bearing 291, a fifth gasket 292, a fifth washer (marked in the figure) and a fifth screw 293, the fifth step shaft section 91 is inserted into the sixth bearing 291, and the fifth screw 293 is threadedly connected to the fifth threaded hole 92 through the fifth gasket (marked in the figure) and the fifth gasket 292 in sequence. The above structural design allows the handrail bar 2 to swing relative to the third shaft rod 9.

[0029] Reference Figures 1 to 3 , Figure 5The lower side of the first connecting rod 15 is provided with two first connecting ears 153 arranged up and down, a third sleeve 154 is provided between the two first connecting ears 153, a fifth shaft rod 155 is connected between the two first connecting ears 153, the fifth shaft rod 155 is located in the third sleeve 154, a sixth shaft rod 156 is provided on the side of the third sleeve 151, a sixth step shaft section 157 is provided at the end of the sixth shaft rod 156, and the sixth step shaft section 157 is provided with a sixth threaded hole 158. The rear end of the rocking connecting rod 22 is provided with a rocking pivot sleeve 221, a seventh bearing 222, a sixth gasket 223, a sixth washer 224 and a sixth screw 225 are provided in the rocking pivot sleeve 221, the sixth step shaft section 157 penetrates into the seventh bearing 222, and the sixth screw 225 passes through the sixth gasket 224 and the sixth gasket 223 in sequence and is threadedly connected to the sixth threaded hole 158. The front end of the rocking link 22 is threadedly connected with a fisheye rod end bearing 30, the pivot member 28 is provided with a transverse fixing rod 282, the end of the fixing rod 282 is provided with a fourth opening member 283, the bearing portion of the fisheye rod end bearing 30 is located in the fourth opening member 283, a fourth half-thread bolt 284 is provided in the fourth opening member 283, the fourth half-thread bolt 284 passes through the bearing portion of the fisheye rod end bearing 30, the smooth section of the fourth half-thread bolt 284 is located in the bearing portion of the fisheye rod end bearing 30, and the threaded section of the fourth half-thread bolt 284 is locked and connected with a nut located on the bottom surface of the fourth opening member 283. The above structural design allows the rocking link 22 to rotate relative to both the first link 15 and the pedal link 19, and when the first link 15 swings, the pedal link 19 is driven to swing automatically through the rocking link 22.

[0030] Reference Figures 1 to 3 , Figure 5A second connecting ear 174 is provided on the front end side of the second connecting rod 17, and a seventh shaft rod 175 facing downward is provided on the second connecting ear 174. A rear parallel pivot sleeve 231 is provided at the rear end of the parallel rod 23. The seventh shaft rod 175 passes through the rear parallel pivot sleeve 231, and a seventh threaded hole (not marked in the figure) is provided at the bottom of the seventh shaft rod 175. A seventh gasket 176, a seventh washer (not marked in the figure) and a seventh screw 177 are provided below the bottom of the seventh shaft rod 175. The seventh screw 177 passes through the seventh washer (not marked in the figure) and the seventh gasket 176 in sequence and is threadedly connected to the seventh threaded hole (marked in the figure). The front end of the parallel rod 23 is provided with a front parallel pivot sleeve 232, and the pedal connecting plate 20 is provided with an eighth shaft rod 202 facing downward, the eighth shaft rod 202 passes through the front parallel pivot sleeve 232, and the bottom of the eighth shaft rod 202 is provided with an eighth threaded hole (marked in the figure), and the bottom of the eighth shaft rod 202 is provided with an eighth gasket 203, an eighth washer 204 and an eighth screw 205, and the eighth screw 205 passes through the eighth washer 204 and the eighth gasket 203 in sequence and is threadedly connected to the eighth threaded hole (marked in the figure). The above structural design allows the parallel rod 23 to rotate relative to the second connecting rod 17 and the pedal connecting plate 20, and when the second connecting rod 17 swings, the parallel rod 23 drives the pedal connecting plate 20 to swing automatically.

[0031] Reference Figures 1 to 5 When the elliptical machine is pedaling, the first swing arm 14, the first connecting rod 15, the linkage rod 16, the second connecting rod 17, the second swing arm 18 and the handrail rod 2 are synchronously swung to form an elliptical trajectory. When the first connecting rod 15 swings, it drives the pulley 10 to rotate through the pivot 13 and the crank 12, and the pulley 10 drives the flywheel 21 to rotate, thereby forming resistance during the pedaling process. When the first connecting rod 15 swings, the pedal connecting rod 19 is automatically swung in the left and right directions relative to the second connecting rod 17 through the shaking connecting rod 22, and when the second connecting rod 17 swings, the foot connecting plate 20 is automatically swung in the left and right directions relative to the pedal connecting rod 19 through the parallel rod 23. The first swing arm 14, the first connecting rod 15, the connecting rod 16, the second connecting rod 17 and the second swing arm 18 in the connecting rod assembly form a multi-link structure design, so that the connecting rod assembly will not produce a dead point when performing an elliptical motion trajectory, and the connecting rod assembly is smoother when swinging. The handrail rod 2 is connected to the crank 12 through the pivot 13, and can assist in driving the pulley 10 when driving, making it easier to start the elliptical machine.

[0032] Reference Figure 3 , Figure 5 and Figure 6The top of the rear end of the pivot member 28 has an extension portion 285 extending backward, an eighth bearing 31 is provided between the top of the first sleeve 173 and the bottom of the extension portion 285, the top of the first rotating shaft 281 passes through the top surface of the extension portion 285, and the top periphery of the first rotating shaft 281 is provided with a first keyway 286, the top surface of the extension portion 285 is provided with a first stop washer 32, a first round nut 33 and three ninth washers 34, the three ninth washers 34 are arranged up and down and are located on the top surface of the extension portion 285, the three ninth washers 34, the first stop washers 32 and the first round nut 33 are arranged in sequence from bottom to top, the top of the first rotating shaft 281 passes through the three ninth washers 34, the first stop washers 32 and the first round nut 33 in sequence and is threadedly connected with the first round nut 33. The first stop washer 32 has a first inner claw 321 and a plurality of first outer claws 322, the first inner claw 321 is clamped in the first keyway 286, and the first round nut 33 has a plurality of first clamping grooves 331, each of which is provided for a first outer claw 322 to be bent and clamped in. The first stop washer 32 is clamped in the first keyway 286 by the first inner claw 321 to achieve fixed connection with the first rotating shaft 281, and the first round nut 33 is locked and then clamped in the first clamping groove 331 by the first outer claw 322 after being bent to achieve connection between the first rotating shaft 281 and the pivot member 28, and at the same time, the bottom of the extension part 285 can press the eighth bearing 31, and the eighth bearing 31 adopts a plane thrust ball bearing, and the setting of the eighth bearing 31 makes the swing of the pedal connecting rod 19 smoother.

[0033] Reference Figure 3 , Figure 5 and Figure 6The bottom of the second rotating shaft 201 extends out of the bottom surface of the second sleeve 191, and the outer periphery of the bottom of the second rotating shaft 201 is provided with a second keyway 206. The bottom surface of the second sleeve 191 is provided with a second stop washer 35, a second round nut 36 and three tenth washers 37. The three tenth washers 37 are arranged up and down and are located on the bottom surface of the second sleeve 191. The three tenth washers 37, the second stop washers 35 and the second round nut 36 are arranged in sequence from top to bottom. The bottom of the second rotating shaft 201 passes through the three tenth washers 37, the second stop washers 35 and the second round nut 36 in sequence and is threadedly connected with the second round nut 36. The second stop washer 35 has a second inner claw 351 and a plurality of second outer claws 352. The second inner claw 351 is clamped in the second keyway 206. The second round nut 36 has a plurality of second clamping grooves 361, and each second clamping groove 361 is for a second outer claw 352 to be bent and clamped. The second stop washer 35 is fixedly connected to the second rotating shaft 201 by the second inner claw 351 being clamped in the second keyway 206 , and the second round nut 36 is locked and then bent by the second outer claw 352 and clamped in the second clamping groove 361 to connect the second rotating shaft 201 and the pedal connecting rod 19 .

[0034] The above is only a specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any non-substantial changes to the utility model using this concept shall be deemed as an infringement of the protection scope of the utility model.

Claims

1. An elliptical machine for strengthening leg exercise, characterized in that: The invention comprises a base, two groups of connecting rod assemblies and two handrail rods, wherein the two groups of connecting rod assemblies and the two handrail rods are arranged on the left and right sides, the base is provided with a base rod and two vertical rods, the two vertical rods are arranged on the left and right sides and are located at the rear side of the base rod, the tops of the two vertical rods are transversely fixedly connected with a first shaft rod, a connecting rod is provided between the first shaft rod and the upper part of the base rod, the connecting rod is transversely fixedly connected with a second shaft rod, the top of the base rod is connected with a column, the lower part of the column is transversely fixedly connected with a third shaft rod, a pulley is provided on the right side of the base rod, a rotating shaft is passed through the upper part of the base rod, the rotating shaft passes through the pulley, the left and right ends of the rotating shaft are connected with cranks, and one side of the crank is connected with a pivot; the two groups of connecting rod assemblies each comprise a first swing arm, a first connecting rod , a connecting rod, a second connecting rod and a second swing arm, the two handrail rods are pivoted to the left and right ends of the third shaft rod respectively, the rear end of the first swing arm is pivoted to the end of the second shaft rod, the front end of the first swing arm is pivoted to the top of the first connecting rod, one end of the pivot extends into the middle part of the first connecting rod, the rear end of the connecting rod is pivoted to one end of the pivot, the front end of the connecting rod is pivoted to the bottom of the handrail rod, the bottom of the first connecting rod is pivoted to the middle part of the second connecting rod, the top of the second swing arm is pivoted to the end of the first shaft rod, the bottom of the second swing arm is pivoted to the rear end of the second connecting rod, the front end of the second connecting rod is pivoted to a pedal connecting rod, and the upper part of the pedal connecting rod is pivoted to a foot connecting plate; a rotatable flywheel is provided on the base, and the pulley is transmission connected to the flywheel.

2. An elliptical machine for strengthening leg exercise as claimed in claim 1, characterized in that: It also includes two rocking links and two parallel rods, each rocking link and each parallel rod corresponds to a group of link assemblies, the rear end of the rocking link is pivoted to the lower part of the first link, the front end of the rocking link is pivoted to the rear part of the pedal link, the rear end of the parallel rod is pivoted to the front part of the second link, and the front end of the parallel rod is pivoted to the bottom of the footrest connecting plate.

3. The elliptical machine for strengthening leg exercise according to claim 1, characterized in that: Both ends of the second shaft rod are provided with a first step shaft section, the top of the first connecting rod is provided with a fourth shaft rod, the front and rear ends of the first swing arm are respectively provided with a first front pivot sleeve and a first rear pivot sleeve, the first rear pivot sleeve is provided with a first step hole that passes through the left and right sides, the first step shaft section extends into the first step hole, the first step shaft section is provided with a first threaded hole, the first step hole is provided with a first gasket, a first washer and a first screw, the first screw passes through the first washer and the first gasket in sequence and is threadedly connected to the first threaded hole, the end of the fourth shaft rod is provided with a second step shaft section, the first front pivot sleeve is provided with a second step hole that passes through the left and right sides, the second step shaft section extends into the second step hole, the second step shaft section is provided with a second threaded hole, the second step hole is provided with a second gasket, a second washer and a second screw, the second screw passes through the second gasket and the second gasket in sequence and is threadedly connected to the second threaded hole.

4. The elliptical machine for strengthening leg exercise according to claim 1, characterized in that: A first bearing sleeve is provided at the middle part of the first connecting rod, a first bearing is provided in the first bearing sleeve, a third step shaft section is provided at the end of the pivot, a second front pivot sleeve and a second rear pivot sleeve are provided at the front and rear ends of the connecting rod respectively, the second rear pivot sleeve is provided with a third step hole which passes through the left and right sides, the end of the second rear pivot sleeve is located in the first sleeve, the third step shaft section passes through the first bearing and extends into the third step hole, the third step shaft section is provided with a third threaded hole, a third gasket, a third washer and a third screw are provided in the third step hole, and the third screw passes through the third gasket in sequence The ring and the third gasket are threadedly connected with the third threaded hole, the bottom of the handrail rod is provided with a first opening piece, the second front pivot sleeve is located in the first opening piece, the second front pivot sleeve is provided with a second bearing, the first opening piece is provided with a first half-tooth bolt, the first half-tooth bolt passes through the second bearing, the middle part of the second connecting rod is provided with a second bearing sleeve, the second bearing sleeve is provided with a third bearing, the bottom of the first connecting rod is provided with a second opening piece, the middle part of the second connecting rod is located in the second opening piece, the second opening piece is provided with a second half-tooth bolt, and the second half-tooth bolt passes through the third bearing.

5. The elliptical machine for strengthening leg exercise as claimed in claim 2, characterized in that: The top and bottom of the second swing arm are respectively provided with an upper pivot sleeve and a lower pivot sleeve, the upper pivot sleeve is provided with a fourth bearing, a fourth gasket, a fourth washer and a fourth screw, the end of the first shaft rod is provided with a fourth step shaft section, the fourth step shaft section is provided with a fourth threaded hole, the fourth step shaft section is inserted into the fourth bearing, and the fourth screw passes through the fourth gasket and the fourth gasket in sequence and is threadedly connected to the fourth threaded hole, the rear end of the second connecting rod is provided with a third opening piece, the lower pivot sleeve is provided with a fifth bearing, the third opening piece is provided with a third half-tooth bolt, the third half-tooth bolt passes through the fifth bearing, the front end of the second connecting rod is provided with a first sleeve, the rear end of the pedal connecting rod is provided with a pivot piece, the rear end of the pivot piece is provided with a first rotating shaft, the first rotating shaft is located in the first sleeve, the front end of the pedal connecting rod is provided with a second sleeve, the pedal connecting plate is provided with a second rotating shaft, and the second rotating shaft is located in the second sleeve.

6. The elliptical machine for strengthening leg exercise according to claim 1, characterized in that: A handrail pivot sleeve is provided at the middle and lower part of the handrail rod, a fifth step shaft section is provided at the end of the third shaft rod, the fifth step shaft section is provided with a fifth threaded hole, a sixth bearing, a fifth gasket, a fifth washer and a fifth screw are provided in the handrail pivot sleeve, the fifth step shaft section passes into the sixth bearing, and the fifth screw passes through the fifth gasket and the fifth gasket in sequence and is threadedly connected to the fifth threaded hole.

7. The elliptical machine for strengthening leg exercise as claimed in claim 5, characterized in that: The lower side surface of the first connecting rod is provided with two first connecting ears arranged up and down, a third shaft sleeve is provided between the two first connecting ears, a fifth shaft rod is connected between the two first connecting ears, the fifth shaft rod is located in the third shaft sleeve, a sixth shaft rod is provided on the side of the third shaft sleeve, a sixth step shaft section is provided at the end of the sixth shaft rod, the sixth step shaft section is provided with a sixth threaded hole, a rocking pivot sleeve is provided at the rear end of the rocking connecting rod, a seventh bearing, a sixth gasket, a sixth washer and a sixth screw are provided in the rocking pivot sleeve, the sixth step shaft section is inserted into the seventh bearing, the sixth screw is threadedly connected to the sixth threaded hole through the sixth gasket and the sixth gasket in turn, the front end of the rocking connecting rod is threadedly connected with a fisheye rod end bearing, the pivot member is provided with a transverse fixing rod, the end of the fixing rod is provided with a fourth opening member, the bearing portion of the fisheye rod end bearing is located in the fourth opening member, a fourth half-tooth bolt is provided in the fourth opening member, and the fourth half-tooth bolt passes through the bearing portion of the fisheye rod end bearing.

8. The elliptical machine for strengthening leg exercise as claimed in claim 2, characterized in that: A second connecting ear is provided on the front end side of the second connecting rod, and a seventh shaft rod facing downwards is provided on the second connecting ear. A rear end of the parallel rod is provided with a rear parallel pivot sleeve, and the seventh shaft rod passes through the rear parallel pivot sleeve. A seventh threaded hole is provided at the bottom of the seventh shaft rod, and a seventh gasket, a seventh washer and a seventh screw are provided below the bottom of the seventh shaft rod. The seventh screw passes through the seventh gasket and the seventh gasket in sequence and is threadedly connected to the seventh threaded hole. A front parallel pivot sleeve is provided at the front end of the parallel rod, and an eighth shaft rod facing downwards is provided on the pedal connecting plate. The eighth shaft rod passes through the front parallel pivot sleeve, and an eighth threaded hole is provided at the bottom of the eighth shaft rod. An eighth gasket, an eighth washer and an eighth screw are provided below the bottom of the eighth shaft rod, and the eighth screw passes through the eighth gasket and the eighth gasket in sequence and is threadedly connected to the eighth threaded hole.

9. The elliptical machine for strengthening leg exercise according to claim 5, characterized in that: The rear end top of the pivot member has an extension portion extending backward, an eighth bearing is provided between the top of the first sleeve and the bottom of the extension portion, the top of the first rotating shaft passes through the top surface of the extension portion, the top outer periphery of the first rotating shaft is provided with a first keyway, the top surface of the extension portion is provided with a first stop washer, a first round nut and a plurality of ninth washers, the plurality of ninth washers are arranged up and down and are located on the top surface of the extension portion, the plurality of ninth washers, the first stop washer and the first round nut are arranged in sequence from bottom to top, the top of the first rotating shaft passes through a plurality of ninth washers, the first stop washer and the first round nut in sequence and is threadedly connected to the first round nut, the first stop washer has a first inner claw and a plurality of first outer claws, the first inner claw is clamped in the first keyway, the first round nut has a plurality of first slots, each first slot is for a first outer claw to be bent and clamped into.

10. The elliptical machine for strengthening leg exercise according to claim 5, characterized in that: The bottom of the second rotating shaft extends out of the bottom surface of the second sleeve, and a second keyway is provided on the outer periphery of the bottom of the second rotating shaft. The bottom surface of the second sleeve is provided with a second stopping washer, a second round nut and a plurality of tenth washers. The plurality of tenth washers are arranged up and down and are located on the bottom surface of the second sleeve. The plurality of tenth washers, the second stopping washer and the second round nut are arranged in sequence from top to bottom. The bottom of the second rotating shaft passes through the plurality of tenth washers, the second stopping washer and the second round nut in sequence and is threadedly connected with the second round nut. The second stopping washer has a second inner claw and a plurality of second outer claws. The second inner claw is clamped in the second keyway. The second round nut has a plurality of second clamping grooves, and each second clamping groove is for a second outer claw to be bent and clamped into.

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