CN218553012U

CN218553012U - Stepping machine

Info

Publication number: CN218553012U
Application number: CN202222490103.3U
Authority: CN
Inventors: 蒋毅恒; 王加额
Original assignee: Xiamen Fuli Titanium Leisure Products Co ltd
Current assignee: Xiamen Fuli Titanium Leisure Products Co ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-03-03
Anticipated expiration: 2032-09-20

Abstract

The utility model discloses a treadmill, which comprises two pedal mechanisms and a main body mechanism, wherein each pedal mechanism is connected with two sides of the main body mechanism in a transmission way, and each pedal mechanism comprises a pedal, a pedal fixing part and an adjusting mechanism; the fixed end of the pedal is rotatably connected to one end of the pedal fixing piece, and the movable end of the pedal is movably attached to the pedal fixing piece; the footboard with set up between the footboard mounting adjustment mechanism to the angle between adjustment footboard and the footboard mounting, the laminating state that is parallel to each other or the separation state that has the contained angle between activity control footboard and the footboard mounting. The treadmill has sitting posture exercise mode and standing exercise mode, can improve the practicability and safety of the treadmill, and has simple structure and convenient use.

Description

Stepping machine

Technical Field

The utility model relates to the technical field of sports equipment, in particular to a treadmill for body building.

Background

The treadmill can make the body-builder constantly repeat the action of climbing the stair, can strengthen cardiovascular system's function, again can fully temper thigh and shank muscle. When the existing treadmill is used, a user needs to stand on the two pedals, and the pedals are lifted and lowered to perform stepping movement in situ so as to achieve the effect of body building and exercise. However, a person who is bloated in posture or has just contacted with the treadmill often feels exhausted after standing for a long time for strenuous exercise, and the person is easy to cause danger of unstable standing. In addition, the elderly and the disabled who are not able to stand or cannot stand for a long time cannot exercise with the treadmill. Therefore, the existing stepping machine has the defects that the stepping machine can only be used in a standing way and cannot be used for exercise in a sitting way.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can sit or stand to carry out the machine of marking time of taking exercise, have simple structure, convenient to use's advantage.

In order to achieve the above purpose, the solution of the present invention is:

a treadmill comprises two pedal mechanisms and a main body mechanism, wherein each pedal mechanism is connected to two sides of the main body mechanism in a transmission way and comprises a pedal, a pedal fixing part and an adjusting mechanism; the fixed end of the pedal is rotatably connected to one end of the pedal fixing piece, and the movable end of the pedal is movably attached to the pedal fixing piece; the pedal with set up between the footboard mounting adjustment mechanism to the angle between adjustment footboard and the footboard mounting, the movable control footboard is for the laminating state that is parallel to each other or the separation state that has the contained angle between footboard and the footboard mounting.

Further, the adjusting mechanism comprises a supporting piece and a limiting part; the fixed end of the supporting piece is rotatably connected to the bottom of the pedal, and the movable end of the supporting piece is movably connected and fixed to the limiting part arranged at the top of the stepping fixing piece; or the fixed end of the supporting piece is rotatably connected to the top of the stepping fixing piece, and the movable end of the supporting piece is movably connected with the limiting part which is fixed at the bottom of the pedal.

Furthermore, the limiting part is a groove arranged at the top of the stepping fixing piece or the bottom of the stepping.

Furthermore, the movable end of the supporting piece is provided with a buckling part, the limiting part is a hook part on a limiting part, and the limiting part is fixedly locked at the top of the stepping fixing piece or the bottom of the pedal.

Further, the pedal comprises a pedal body and a pedal connecting piece; the pedal body is fixed above the pedal connecting piece, and the adjusting mechanism is arranged between the pedal connecting piece and the pedal fixing piece.

Furthermore, a buckle groove is arranged on the pedal connecting piece, and the pedal connecting piece is movably buckled above the pedal fixing piece.

Further, the adjusting mechanism comprises a supporting piece and a limiting piece; the fixed end of the supporting piece is rotatably connected in the buckling groove of the pedal connecting piece, the movable end of the supporting piece is provided with a buckling part, and the supporting piece is movably accommodated in the buckling groove; the locating part includes locating part main part and protruding hook portion of locating in the locating part main part, and the locating part main part is fixed in footboard mounting top, and hook portion supplies to detain the portion activity card and links firmly.

Further, the main body mechanism comprises a main frame pipe set, a linkage mechanism and two hydraulic oil cylinders; the pedal mechanisms are respectively arranged on two sides of the main frame pipe group and are respectively in transmission connection with the hydraulic oil cylinders, and the hydraulic oil cylinders are connected to the main frame pipe group; the linkage mechanism is positioned between the two pedal mechanisms and is in transmission connection with the two pedal mechanisms.

Furthermore, the main frame pipe group comprises four support legs and a longitudinal rod for connecting the support legs, wherein a vertical rod is vertically arranged between the front left support leg and the front right support leg, and a left cross rod and a right cross rod extend from the left to the right of the upper part of the vertical rod; one end of the pedal fixing piece of each pedal mechanism is rotatably sleeved on the left cross rod or the right cross rod, the other end of the pedal fixing piece is rotatably connected to the output end of the hydraulic oil cylinder, and the body of the hydraulic oil cylinder is fixed on the front left supporting leg or the front right supporting leg on the same side.

Further, the main body mechanism further comprises a limit knob; the linkage mechanism is connected between the two pedal mechanisms and comprises a connecting piece, two connecting rods and a limiting rod, one end of the limiting rod is rotatably connected to the middle part of the connecting piece, the other end of the limiting rod extends into a through hole formed in the middle position behind the vertical rod, one end of each of the two connecting rods is rotatably connected to the left side and the right side of the connecting piece in the left-right direction respectively, the other end of each of the two connecting rods is rotatably connected to the linkage convex parts of the pedal fixing piece in the left-right direction respectively, and the linkage convex parts of the pedal fixing piece are convexly arranged at the connecting ends of the pedal fixing piece and the left-right cross rods; the perforation of montant link up around the middle part of montant, and the gag lever post stretches from the montant rear end and puts in the perforation, and the perforation of montant front end is then worn and is put spacing knob, spacing knob include stop screw and plum blossom knob, and stop screw supports with the tip activity of gag lever post with the montant is inside to lean on.

After the technical scheme is adopted, the angle between the pedal and the pedal fixing piece is adjusted by adjusting the adjusting mechanism, so that the pedal and the pedal fixing piece can be controlled to be in a mutually parallel fit state, the treadmill is in a standing exercise mode, and a user can normally stand to exercise; or the pedal is controlled to be in a separation state with a certain angle included angle between the pedal and the pedal fixing piece, so that the pedal can be in an inclined state, the pedal machine is switched to a sitting posture exercise mode, and a user can sit on the chair for use; namely, the practicability and the safety of the treadmill can be improved only by additionally arranging the adjusting mechanism without changing the main body mechanism, and the treadmill has the advantages of simple structure and convenient use.

Drawings

Fig. 1 is a perspective view of a sitting posture exercise mode according to an embodiment of the present invention;

fig. 2 is a side view of a sitting exercise mode of an embodiment of the present invention;

fig. 3 is a perspective view of a standing exercise mode according to an embodiment of the present invention;

fig. 4 is a side view of a standing exercise mode of an embodiment of the present invention;

fig. 5 is an exploded view of an embodiment of the present invention;

fig. 6 is a schematic diagram of the use of the standing exercise mode according to the embodiment of the present invention;

fig. 7 is a schematic diagram illustrating the use of the sitting exercise mode according to the embodiment of the present invention;

fig. 8 is a schematic view of an adjustment limit knob according to an embodiment of the present invention;

fig. 9 is a schematic usage diagram of a lacing pattern according to an embodiment of the present invention.

Description of the symbols:

walking-on machine 100

Pedal mechanism 10 pedal 1 pedal body 11 pedal attachment 12

Side wall 1211 of the fastening groove 121 is connected with the connecting shaft 123 of the lug 122

Pedal fixing piece 2 linkage convex part 21 adjusting mechanism 3 support piece 31

Connecting portion 311 and fastening portion 312 position limiting part 32 and position limiting portion 321

Connecting hole 323 of limiting member main body 322

Main body mechanism 20

Vertical rod 43 of vertical rod 42 of support leg 41 of main frame pipe group 4

Perforated 431 left crossbar 44 right crossbar 45

Connecting piece 51 connecting rod 52 limiting rod 53 of linkage mechanism 5

Limiting screw rod 71 plum blossom knob 72 of limiting knob 7 of hydraulic oil cylinder 6

Electronic watch 8 electronic head 81

The user 200.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the application usually place when in use, or the orientations or positional relationships that the skilled person usually understands, are only for convenience of description and simplification of description, and do not indicate or imply that the indicated devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the application.

Further, the term "plurality" means two or more unless specifically limited otherwise.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. To simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Further, the present application may repeat reference numerals and/or reference letters in the various examples for simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or arrangements discussed.

Further, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.

As shown in fig. 1 to 5, the treadmill 100 of the present invention includes two pedal mechanisms 10 and a main body mechanism 20, each pedal mechanism 10 is drivingly connected to both sides of the main body mechanism 20, and the foot of the user 200 contacts the pedal mechanism 10 to perform exercise.

The main body mechanism 20 assists the pedal mechanism 10 to be linked, and may be a hydraulic cylinder linked structure or a crank transmission structure of the elliptical treadmill, and the hydraulic cylinder linked structure is taken as an example in this embodiment.

The pedal mechanism 10 includes a pedal 1, a pedal fixing member 2, and an adjusting mechanism 3.

The pedal 1 is generally configured to conform to the shape of a human foot, and some surfaces of the pedal 1 are further provided with anti-slip stripes, massage structures, and the like. The pedal fixing member 2 can be a plate-shaped or tubular metal structure, is used for fixing the pedal 1 and is in transmission connection with the main body mechanism 20.

As shown in fig. 1, in this embodiment, the pedal fixing member 2 is a square tube, one end of the pedal 1 is rotatably connected to one end of the pedal fixing member 2, and the other end of the pedal 1 is movably attached to the pedal fixing member 2. Set up between footboard 1 and the footboard mounting 2 adjustment mechanism 3 to the angle between adjustment footboard 1 and the footboard mounting 2, steerable footboard 1 and the separation state that is parallel to each other's laminating state or is certain angle contained angle between the footboard mounting 2.

As shown in fig. 1 and fig. 5, in the present embodiment, the adjusting mechanism 3 includes a supporting member 31 and a limiting member 32, the supporting member 31 is rotatably installed at the bottom of the pedal 1, the limiting member 32 is fixedly installed at the top of the pedal fixing member 2, the limiting member 32 has a limiting portion 321 for the supporting member 31 to be fixedly connected, that is, the fixed end of the supporting member 31 is rotatably connected to the pedal 1, and the movable end of the other end is movably attached to the bottom of the pedal 1 or is fixedly connected to the limiting portion 321 of the limiting member 32, so that the pedal 1 is attached to and parallel to the pedal fixing member 2 (see fig. 4), or the pedal 1 is supported to form an included angle between the pedal 1 and the pedal fixing member 2 (see fig. 2).

Therefore, before use, the support member 31 is retracted to enable the pedal 1 to be in a horizontal state, so that the treadmill 100 is in a standing exercise mode for a user 200 to normally stand for exercise (see fig. 6); and prop up support piece 31, can make footboard 1 be the tilt state, make footboard 1 machine switch to position of sitting exercise mode, can supply user 200 to sit and use on the chair (refer to fig. 7), what user 200 foot lifted up the slope supports and leans on footboard 1, can sit and take exercise, need not to change main part mechanism 20, only add adjustment mechanism 3, can improve the practicality and the security of machine of marking time 100, and have simple structure, high durability and convenient use's advantage, and make user 200 sit and take exercise the shank in waist untimely, also make things convenient for the old man to sit and the crowd that can't stand to take exercise, it is more humanized, user experience who has the preferred.

As shown in fig. 5, in the present embodiment, the main body of the supporting member 31 of the adjusting structure of the pedal 1 is "U" shaped, and the upper end of the "U" shape is connected with a cross bar, that is, the fixed end of the supporting member 31 is convexly provided with a connecting portion 311 towards two sides for being rotatably connected to the pedal 1, and the movable end of the supporting member 31 is provided with a buckling portion 312 for being buckled and fixed with the limiting portion 321 of the limiting member 32. The position-limiting member 32 includes a flat position-limiting member main body 322 and the position-limiting portion 321, the position-limiting portion 321 is a hook portion protruding from the position-limiting member main body 322, the hook portion is used for being engaged with the buckle portion 312 of the supporting member 31, and the position-limiting member main body 322 is provided with a connecting hole 323 which can be locked at the middle position of the pedal fixing member 2 by a screw.

The number of the hook portions of the limiting member 32 in this embodiment is one, but may be a plurality of hook portions to change into different included angles. The limiting portion 321 of the limiting member 32 may also be a groove (not shown) directly opened on the top of the pedal fixing member 2, so that the fastening portion 312 of the supporting member 31 can be inserted and fixed. That is, the structure of the limiting member 32 can be varied and adjusted in a variety of ways, and the supporting member 31 can be connected and positioned. Similarly, the supporting member 31 may also have other structures, such as a plate shape (not shown), a fixed end rotatably connected to the pedal 1, a movable end movably inserted into the limiting portion 321 fixed to the limiting member 32, and so on.

In addition, the supporting member 31 of the adjusting mechanism 3 of the present embodiment is rotatably connected to the pedal 1, and the limiting member 32 is fixed to the pedal fixing member 2, but of course, the supporting member 31 may be rotatably connected to the pedal fixing member 2, and the limiting member 32 may be fixed to the pedal 1, so that the switching between the sitting posture and the standing posture can be realized.

As shown in fig. 5, in the present embodiment, the pedal 1 includes a pedal body 11 and a pedal connector 12, the pedal body 11 is made of plastic and is fixed above the pedal connector 12, and the pedal connector 12 is made of metal. The pedal connecting member 12 has a buckle slot 121, and the connecting portion 311 of the supporting member 31 is rotatably connected to two sidewalls 1211 of the buckle slot 121, so that the supporting member 31 can be rotatably received in the buckle slot 121; two connecting lugs 122 are convexly arranged at one end of the pedal connecting piece 12, the pedal connecting piece is rotatably connected to one end of the pedal fixing piece 2 through a connecting shaft 123, the pedal 1 and the pedal fixing piece 2 are rotatably connected into a whole, and the width of the buckling groove 121 is slightly larger than that of the pedal fixing piece 2, so that the pedal 1 can be buckled above the pedal fixing piece 2 through the buckling groove 121 (see fig. 4), and the connection stability of the pedal 1 and the pedal fixing piece 2 in a standing exercise mode is improved.

As shown in fig. 1, 3, and 5, the main body mechanism 20 of the present embodiment includes a main frame tube group 4, an interlocking mechanism 5, two hydraulic cylinders 6, a limit knob 7, and an electronic timepiece 8.

The pedal mechanisms 10 are respectively arranged on two sides of the main frame pipe group 4 and are respectively in transmission connection with the hydraulic oil cylinders 6, and the hydraulic oil cylinders 6 are connected to the main frame pipe group 4; the linkage mechanism 5 is located between the two pedal mechanisms 10 and is in transmission connection with the two pedal mechanisms 10.

The main frame tube group 4 includes four legs 41 and longitudinal bars 42 connecting the legs 41, a vertical bar 43 is erected between the left front leg 41 and the right front leg 41, and a left cross bar 44 and a right cross bar 45 extend from the upper portion of the vertical bar 43 to the left and right. The four supports are used for supporting the treadmill 100, one end of the pedal fixing member 2 of each pedal mechanism 10 is rotatably sleeved on the left cross bar 44 or the right cross bar 45, the other end is rotatably connected to the output end of one of the hydraulic cylinders 6, the body of the hydraulic cylinder 6 is fixed on the front left support leg 41 or the front right support leg 41 on the same side, and the pedal mechanism 10 is assisted to lift by the hydraulic cylinder 6.

The linkage mechanism 5 is connected between the two pedal mechanisms 10, the linkage mechanism 5 comprises a connecting sheet 51, two connecting rods 52 and a limiting rod 53, one end of the limiting rod 53 is rotatably connected to the middle part of the connecting sheet 51, the other end of the limiting rod 53 extends to a through hole 431 formed in the middle position behind the vertical rod 43, one end of each of the two connecting rods 52 is rotatably connected to the left side and the right side of the connecting sheet 51 in a left-right mode respectively, the other end of each of the two connecting rods 53 is rotatably connected to the linkage convex parts 21 of the left pedal fixing part 2 and the right pedal fixing part 2 respectively, and the linkage convex parts 21 of the pedal fixing parts 2 are convexly arranged at the connecting ends of the pedal fixing parts 2 and the left cross rod 45, so that the linkage movement of the left pedal mechanism 10 and the right pedal mechanism 10 can be realized by using the connecting rods 52 and the connecting sheet 51.

The through hole 431 of the vertical rod 43 penetrates through the front and the back of the middle part of the vertical rod 43, the limiting rod 53 extends into the through hole 431 from the back end of the vertical rod 43, the through hole 431 at the front end of the vertical rod 43 penetrates through the limiting knob 7, the limiting knob 7 comprises a limiting screw 71 and a plum blossom knob 72, and the limiting screw 71 can abut against the end part of the limiting rod 53 in the vertical rod 43. Therefore, the tightness of the limit screw 71 can be controlled by adjusting the quincuncial knob 72, the depth of the limit rod 53 extending into the vertical rod 43 can be controlled, and the two pedal mechanisms 10 can be fixed, namely, referring to fig. 8 and 9, the limit knob 7 can be locked, the end part of the limit rod 53 is abutted against the end part of the limit screw 71 to be limited and fixed, the two connecting rods 52 and the two pedal mechanisms 10 are linked to be fixed and cannot move, the treadmill 100 can be switched to a lacing wire mode, and a user 200 can lacing the feet.

As shown in fig. 1 and 5, the electronic watch 8 includes an electronic meter 81 and a detection device, the electronic meter 81 is disposed on the top of the vertical rods 43 of the main frame tube group 4, and the detection device is disposed inside (not shown) the main frame tube group 4, so that the recording and displaying of the exercise time and intensity or the number of steps can be realized. The structure of the electronic watch 8 is prior art here and will not be described in detail here.

To sum up, the utility model discloses a treadmill 100 through set up adjustment mechanism 3 between footboard 1 and the footboard mounting 2 in footboard mechanism 10, adjustable footboard 1 is in the height of footboard mounting 2, makes treadmill 100 have the position of sitting and takes exercise the mode and the mode of taking exercise of standing, more has the practicality.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that equivalent changes and modifications without departing from the principles of the present invention shall still fall within the protection scope of the present invention for those skilled in the art.

Claims

1. The utility model provides a treadmill, includes two pedal mechanism and a main part mechanism, and each pedal mechanism transmission is connected in the both sides of main part mechanism, its characterized in that: the pedal mechanism comprises a pedal, a pedal fixing piece and an adjusting mechanism; the fixed end of the pedal is rotatably connected to one end of the pedal fixing piece, and the movable end of the pedal is movably attached to the pedal fixing piece; the pedal with set up between the footboard mounting adjustment mechanism to the angle between adjustment footboard and the footboard mounting, the movable control footboard is for the laminating state that is parallel to each other or the separation state that has the contained angle between footboard and the footboard mounting.

2. The treadmill of claim 1, wherein: the adjusting mechanism comprises a supporting piece and a limiting part; the fixed end of the supporting piece is rotatably connected to the bottom of the pedal, and the movable end of the supporting piece is movably connected and fixed to the limiting part arranged at the top of the stepping fixing piece; or the fixed end of the supporting piece is rotatably connected to the top of the stepping fixing piece, and the movable end of the supporting piece is movably connected with the limiting part which is fixed at the bottom of the pedal.

3. A treadmill as recited in claim 2, wherein: the limiting part is a groove arranged at the top of the stepping fixing piece or the bottom of the stepping.

4. A treadmill as recited in claim 2, wherein: the movable end of the supporting piece is provided with a buckling part, the limiting part is a hook part on a limiting part, and the limiting part is fixedly locked at the top of the stepping fixing piece or the bottom of the pedal.

5. The treadmill of claim 1, wherein: the pedal comprises a pedal main body and a pedal connecting piece; the pedal body is fixed above the pedal connecting piece, and the adjusting mechanism is arranged between the pedal connecting piece and the pedal fixing piece.

6. The treadmill of claim 5, wherein: the pedal connecting piece is provided with a buckling groove, and the pedal connecting piece is movably buckled above the pedal fixing piece.

7. A treadmill as claimed in claim 5, characterised in that: the adjusting mechanism comprises a supporting piece and a limiting piece; the fixed end of the supporting piece is rotatably connected in the buckling groove of the pedal connecting piece, the movable end of the supporting piece is provided with a buckling part, and the supporting piece is movably accommodated in the buckling groove; the locating part comprises a locating part main body and a hook part convexly arranged on the locating part main body, the locating part main body is fixed at the top of the pedal fixing part, and the hook part is movably clamped and connected with the buckle part.

8. The treadmill of claim 1, wherein: the main body mechanism comprises a main frame pipe set, a linkage mechanism and two hydraulic oil cylinders; the pedal mechanisms are respectively arranged on two sides of the main frame pipe group and are respectively in transmission connection with the hydraulic oil cylinders, and the hydraulic oil cylinders are connected to the main frame pipe group; the linkage mechanism is positioned between the two pedal mechanisms and is in transmission connection with the two pedal mechanisms.

9. The treadmill of claim 8, wherein: the main frame pipe group comprises four support legs and longitudinal rods for connecting the support legs, a vertical rod is vertically arranged between the front left support leg and the front right support leg, and a left cross rod and a right cross rod extend from the left to the right of the upper part of the vertical rod; one end of the pedal fixing piece of each pedal mechanism is rotatably sleeved on the left cross rod or the right cross rod, the other end of the pedal fixing piece is rotatably connected to the output end of the hydraulic oil cylinder, and the body of the hydraulic oil cylinder is fixed on the front left supporting leg or the front right supporting leg on the same side.

10. A treadmill as recited in claim 9, wherein said tread support comprises: the main body mechanism further comprises a limit knob; the linkage mechanism is connected between the two pedal mechanisms and comprises a connecting sheet, two connecting rods and a limiting rod, one end of the limiting rod is rotatably connected to the middle part of the connecting sheet, the other end of the limiting rod extends into a through hole formed in the middle position behind the vertical rod, one ends of the two connecting rods are respectively rotatably connected to the left side and the right side of the connecting sheet in a left-right mode, the other ends of the two connecting rods are respectively rotatably connected to linkage convex parts of the pedal fixing piece on the left side and the right side, and the linkage convex parts of the pedal fixing piece are convexly arranged at the connecting ends of the pedal fixing piece and the left transverse rod and the right transverse rod; the perforation of montant link up around the middle part of montant, and the gag lever post stretches from the montant rear end and puts in the perforation, and the perforation of montant front end is then worn and is put spacing knob, spacing knob include stop screw and plum blossom knob, and stop screw supports with the tip activity of gag lever post with the montant is inside to lean on.