Stair climber

Abstract

This invention provides a stair climber, comprising a body, supporting legs, a handrail assembly, and two foot pedals. The supporting legs are connected to the bottom of the front side of the body and can rotate and fold or unfold relative to the body. The handrail assembly is rotatably connected to the front end of the body, and an angle adjustment mechanism is provided between the handrail assembly and the body to adjust the relative angle between the handrail assembly and the body. The two foot pedals are connected to the body at left and right intervals and can slide back and forth alternately relative to the body. The stair climber also includes a secondary grip, which is detachably connected to the front end of the body. When the body is in a flat position and the user is kneeling on the two foot pedals in a prone position, the secondary grip is used for the user's hands to hold it. This invention has the advantage of multiple usage modes, thereby meeting different user needs.

Description

Technical Field

[0001] This invention relates to the field of fitness equipment technology, and more specifically, to a stair climber. Background Technology

[0002] A stair climber or mountain climber is a type of indoor fitness equipment. During use, the pedals can be moved up and down by stepping on them, achieving a similar exercise effect to climbing stairs or mountains indoors. Currently, Chinese Patent Publication No. CN223336699U discloses a new type of magnetically controlled stair climber. When using this stair climber for exercise, the main body needs to be supported on the ground by a support frame, and two movable pedals are used for the user's feet to step on them to achieve the purpose of exercise. However, the above-mentioned stair climber has the disadvantage of limited functionality. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a stair climbing machine that has the advantage of multiple usage methods, thereby meeting the different usage needs of users.

[0004] This invention provides a stair climber, comprising a body, supporting legs, a handrail assembly, and two foot pedals. The supporting legs are connected to the bottom of the front side of the body and can rotate and fold or unfold relative to the body. The handrail assembly is rotatably connected to the front end of the body, and an angle adjustment mechanism is provided between the handrail assembly and the body to adjust the relative angle between the handrail assembly and the body. The two foot pedals are connected to the body at left and right intervals and can slide back and forth alternately relative to the body. The stair climber also includes a secondary grip. The secondary grip is detachably connected to the front end of the body. When the body is in a flat position and the user is kneeling on the two foot pedals for a prone exercise, the secondary grip is used for the user's hands to hold it.

[0005] Compared to existing stair-climbing machines on the market, this invention has the advantage of diverse usage methods, thus meeting the different needs of users.

[0006] In one possible implementation, the secondary grip is shaped like an inverted "U," with bent sections at both ends that curve towards the fuselage. Each bent section has a vertically fixed insertion post. The bottom of the front of the fuselage has slots that vertically correspond to the two insertion posts. Each insertion post is inserted into its corresponding slot and fixed to the fuselage. Casters are fixed to the front side of the connection point between each bent section and the secondary grip. With this structure, after the insertion posts are inserted into the slots and fixed to the fuselage, [the process is complete]. This design allows the auxiliary handle to be reliably secured to the machine body. The plug-in post can be fixed to the machine body with fastening bolts, and the auxiliary handle has the advantage of being easy to disassemble from the machine body. In addition, by fixing casters to the front side of the connection between each bending section and the auxiliary handle, when the stair climber needs to be moved, the rear end of the machine body can be lifted. At this time, the casters can support the ground, which facilitates the movement of the stair climber. When the stair climber is moved to the target position and the machine body is returned to a horizontal state, the casters can be lifted off the ground.

[0007] In one possible implementation, each foot pedal mechanism includes a guide rail, a sliding seat, and a foot pedal assembly. The guide rail is fixed to the machine body and extends from front to back. Slide grooves extending along the length of the guide rail are provided on both the left and right sides. Roller sets are provided on both the left and right sides of the sliding seat, with each roller set rollingly engaged in the corresponding slide groove. By adopting the above structure, the foot pedal assembly is slidably connected to a single guide rail by the cooperation of two roller sets and two slide grooves. This effectively prevents the foot pedal assembly from tilting or jamming when sliding along the guide rail, thus improving the reliability and stability of the foot pedal assembly's sliding connection to the guide rail. Simultaneously, when the two foot pedal assemblies slide alternately back and forth along the two guide rails, the parallelism of the two foot pedal assemblies relative to the guide rails is ensured.

[0008] In one possible implementation, each roller group includes two rollers spaced apart front to back. The two rollers in each roller group are rotatably connected to the front end and rear end of the sliding seat, respectively. The two rollers in each roller group are rolled in the corresponding grooves. With this structure, the two rollers in each roller group can provide reliable support for the front and rear ends of the sliding seat, so as to ensure the smoothness of the sliding seat when it slides along the length of the sliding seat.

[0009] In one possible implementation, vertical edges are provided at the top and bottom of the openings on the side of each groove. The vertical edges are used to abut against the outer surface of the outer edge of the roller to prevent the roller from laterally dislodging from the groove. With this structure, the vertical edges can prevent the roller from laterally dislodging from the groove, thereby further improving the reliability and stability of the sliding seat when it relies on the roller to slide on the guide rail.

[0010] In one possible implementation, the foot pedal assembly includes a pedal, a rotating frame, and a support frame. The pedal is fixed to the upper end of the rotating frame, the front end of the rotating frame is rotatably connected to the front end of the support frame, and the support frame is fixed to a sliding seat. An adjustment and locking assembly is movably connected to the support frame, the adjustment and locking assembly having an operating end and a locking end, and two locking parts are provided at the front of the rotating frame. When the operating end is released to engage the locking end with one of the locking parts, the pedal angle is locked in the current state. When the operating end is operated to disengage the locking end from the locking part, the rotating frame and the support frame are unlocked, and the rotating frame can rotate relative to the support frame to adjust the pedal angle. By adopting the above-mentioned foot pedal assembly, when it is necessary to adjust the pedal angle, simply operate the operating end of the adjustment locking assembly to disengage the locking end of the adjustment locking assembly from the locking part on the current rotating frame. Then, rotate the pedal and the rotating frame to adjust the pedal angle. Finally, release the operating end of the adjustment locking assembly to lock the locking end of the adjustment locking assembly with another locking part on the rotating frame, thus locking the pedal angle. Compared with the method of adjusting the pedal angle by plugging in pins and holes in the current stair climbers on the market, it has the advantages of convenient pedal angle adjustment and locking.

[0011] In one possible implementation, the adjustment locking assembly includes a movable frame and a reset unit. The movable frame is connected to and movable relative to the support frame. The front end of the movable frame has two symmetrically arranged locking portions, forming the locking end of the adjustment locking assembly. The rear end of the movable frame has an operating handle, forming the operating end of the adjustment locking assembly. The rotating frame has two symmetrically arranged first slots and two symmetrically arranged second slots. The two first slots form one locking portion, and the two second slots form the other locking portion. The two locking portions are used to engage with either the two first slots or the two second slots. The reset unit is located between the front end of the movable frame and the front end of the support frame. When the operating handle is released... The reset unit is used to drive the movable frame to move and reset relative to the support frame. With this adjustment and locking assembly, when the operating handle is operated to disengage the two locking parts from the two first locking slots and the two second locking slots, the pedal and rotating frame can rotate relative to the support frame. At this time, the pedal angle can be adjusted. When the operating handle is released to engage the two locking parts with the two first locking slots, the pedal angle is locked in the first angle state. When the operating handle is released to engage the two locking parts with the two second locking slots, the pedal angle is locked in the second angle state. Through this structure, the pedal angle can be easily adjusted, and after the pedal angle is adjusted, the pedal can be easily locked.

[0012] In one possible implementation, the adjusting locking assembly further includes a first slide rod and a second slide rod; the first slide rod is horizontally fixed to the front end of the movable frame, and the second slide rod is horizontally fixed to the middle of the movable frame; the front of the support frame is provided with two left-right symmetrical first slide holes, each first slide hole extending horizontally from front to back, and both ends of the first slide rod passing through one of the first slide holes and extending out of the first slide hole and slidingly engaging with the first slide hole, forming two locking portions at both ends of the first slide rod; the rear of the support frame is provided with two left-right symmetrical second slide holes, each second slide hole gradually sloping downwards from front to back, and both ends of the second slide rod slidingly engaging with one of the second slide holes; with this structure, when the operating handle is pressed, the movable frame can move backward relative to the support frame, at which point the two ends of the first slide rod can disengage from the two first locking slots or the two second locking slots, thus unlocking the rotating frame and the pedal, and allowing adjustment of the pedal angle. Section; When the operating handle is released, both ends of the first slide rod can engage with the two first slots or the two second slots. When both ends of the first slide rod engage with the two first slots, the pedal angle can be locked in a first angle state. When both ends of the second slide rod engage with the two second slots, the pedal angle can be locked in a second angle state. With the above structure, the pedal angle can be easily adjusted, and after the pedal angle is adjusted, the pedal can be easily locked. The reset unit includes a tension spring; one end of the tension spring is hooked to the middle of the first slide rod, and the other end of the tension spring is hooked to the front end of the support frame. With this reset unit, when the operating handle is released, the tension spring can drive the movable frame to move forward relative to the support frame to reset, and can make both ends of the first slide rod engage with the two first slots or the two second slots, thereby locking the pedal angle in a first angle state or a second angle state. This reset unit has the advantage of simple structure.

[0013] In one possible implementation, the handrail assembly includes a handrail and two uprights; both ends of the handrail are fixed to the upper end of one of the uprights, and the lower ends of the two uprights are rotatably connected to the left and right sides of the front of the machine body, respectively. An angle adjustment structure is provided between the lower end of each upright and the machine body, and the two angle adjustment structures constitute an angle adjustment mechanism. Each angle adjustment structure includes a nut sleeve and a hand-tightening bolt. The lower end of the upright is rotatably connected to one side of the machine body, the nut sleeve is fixed inside the machine body, and the screw portion of the hand-tightening bolt is axially movable through the lower end of the upright and threadedly fastened to the nut sleeve. The angle adjustment structure also includes a fixed plate and an adjusting plate; the fixed plate... Fixed to the outer wall of the machine body, the adjusting plate is fixed to the inner side of the lower end of the column, and the screw part is coaxially movably inserted through the fixed plate and the adjusting plate; the inner wall of the adjusting plate is provided with a set of pins, and the fixed plate is provided with a number of sets of holes spaced apart in the circumferential direction around the fixed plate; when the pins are engaged with the sets of holes at different positions, the column is locked at different angles relative to the machine body; in the above structure, the rotation limit of the adjusting plate and the fixed plate is achieved by the engagement of the pins and the sets of holes, that is, the rotation limit of the column and the machine body is achieved, thereby effectively improving the reliability and stability of the rotation limit between the handrail assembly and the machine body.

[0014] In one possible implementation, a connecting sleeve is fixed to the inner side of the lower end of each column. The screw part is coaxially and movably inserted into the connecting sleeve. An annular protrusion is provided on the outer end of the nut sleeve, which is axially inserted into the fixed plate. The annular protrusion is coaxially inserted into the inner end of the connecting sleeve and rotates with the connecting sleeve. With this structure, the coaxiality of the column relative to the machine body and the coaxiality of the adjusting plate relative to the fixed plate can be guaranteed by the interlocking and rotating action of the annular protrusion and the inner end of the connecting sleeve. At the same time, in this embodiment, when the hand-tightened nut is loosened, even if the lower end of the column moves away from the machine body, the annular protrusion is always inserted into the inner end of the connecting sleeve and rotates with the connecting sleeve.

[0015] In one possible implementation, each angle adjustment structure also includes a spring; the spring is sleeved on the screw portion located inside the connecting sleeve, one end of the spring abuts against the outer end of the annular protrusion, and the other end of the spring abuts against the inner side of the outer end of the connecting sleeve; with this structure, when the hand-tightening bolt is gradually loosened, under the action of the spring, the spring can automatically push the lower end of the column away from the machine body, thereby facilitating the disengagement of the pin group on the adjustment plate from the insertion hole group on the fixed plate; and since the spring is sleeved on the screw portion located inside the connecting sleeve, the column angle adjustment structure has the advantage of high structural compactness.

[0016] In one possible implementation, a limiting block is provided on the outer peripheral wall of the adjusting plate, and a limiting groove is provided on the outer peripheral wall of the fixed plate. When the column rotates relative to the machine body, the limiting block slides along the extension direction of the limiting groove, and the limiting block and the limiting groove are used to limit the rotation range of the column relative to the machine body. By adopting this structure, when the column rotates relative to the machine body, the rotation range of the column relative to the machine body can be limited by the cooperation of the limiting block and the limiting groove, thereby avoiding the situation where the column is excessively rotated.

[0017] In one possible implementation, a stud with an outer diameter smaller than that of the screw is coaxially provided on the inner end of the screw section, and a lock nut is threaded and tightened on the stud. With this structure, when the hand-tightened bolt is continuously loosened, the lock nut can eventually abut against the inner end of the nut sleeve, thereby preventing the bolt from being completely removed, that is, preventing the loss of the hand-tightened bolt, and preventing the lower end of the column from completely detaching from the machine body. Attached Figure Description

[0018] Figure 1 A three-dimensional structural diagram of the stair climber in its first usage state; Figure 2 A three-dimensional structural diagram of the stair climber in its second usage state; Figure 3 A three-dimensional structural diagram of the stair climber in its third usage state; Figure 4 for Figure 3 A partially disassembled three-dimensional structure diagram; Figure 5 This is a three-dimensional structural diagram of the foot pedal mechanism; Figure 6 A partial exploded 3D structural diagram of the foot pedal mechanism; Figure 7 This is a schematic diagram of the first three-dimensional structure of the pedal assembly; Figure 8 This is a schematic diagram of the second three-dimensional structure of the pedal assembly; Figure 9 This is a cross-sectional view of the stair-climbing machine. Figure 10 for Figure 9 A magnified structural diagram of point A in the middle; Figure 11 This is a partial exploded 3D structural diagram of the armrest assembly and the main body. Figure 12 This is a three-dimensional structural diagram of the adjusting plate after it is fixed to the column. Detailed Implementation

[0019] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0020] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0021] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] See Figures 1-12 As shown in the figure, this application discloses a stair climber, including a body 1, support legs 2, handrail assembly 3, and two foot pedal mechanisms 4; the support legs 2 are connected to the bottom of the front side of the body 1 and can rotate and fold or open relative to the body 1; the handrail assembly 3 is rotatably connected to the front end of the body 1; an angle adjustment mechanism is provided between the handrail assembly 3 and the body 1 to adjust the relative angle between the handrail assembly 3 and the body 1; the two foot pedal mechanisms 4 are connected to the body 1 at left and right intervals and can slide back and forth alternately relative to the body 1; the stair climber also includes a secondary handle 5; the secondary handle 5 is detachably connected to the front end of the body 1; when the body 1 is in a flat position and the user is kneeling on the two foot pedal mechanisms 4 for prone exercise, the secondary handle 5 is used for the user's hands to hold.

[0024] Compared to existing stair-climbing machines on the market, this invention has the advantage of diverse usage methods, as detailed below: See you again Figure 1 As shown, Figure 1The invention provides a first mode of use in which the support legs are rotated open relative to the body. At this time, the body is tilted relative to the ground and supported on the ground by the support legs and the first support foot located at the rear of the body. At the same time, the armrest assembly is adjusted to be perpendicular to the ground. In this state, the user's hands can hold the armrest assembly, and the feet can step on the two pedal mechanisms for exercise (the pedals in the pedal mechanisms are adjusted to be horizontal).

[0025] See you again Figure 2 As shown, Figure 2 A second mode of use of the present invention is provided. In this mode, the support legs are rotated and folded relative to the body. At this time, the body is horizontal relative to the ground, and the body is supported on the ground by the second support foot located at the bottom of the auxiliary grip and the third support foot located at the bottom of the rear side of the body. At the same time, the armrest assembly is adjusted to be perpendicular to the ground. In this state, the user's hands can hold the armrest assembly, and the feet can step on the two pedal mechanisms for exercise (the pedals in the pedal mechanisms are adjusted to be horizontal).

[0026] See you again Figure 3 As shown, Figure 3 A third mode of use of the present invention is provided. In this mode, the support leg is rotated and folded relative to the body. At this time, the body is horizontal relative to the ground and is supported on the ground by the second support foot located at the bottom of the auxiliary handle and the third support foot located at the bottom of the rear side of the body. At the same time, the armrest assembly is folded to a horizontal state relative to the body. In this state, the user's hands can hold the auxiliary handle and the user's legs can kneel on the two pedal mechanisms for exercise (the pedals in the pedal mechanisms are adjusted to a horizontal state). In this mode of use, the user's abdominal muscles can be exercised.

[0027] The secondary grip 5 is shaped like an inverted "U". Both ends of the secondary grip 5 have bent sections 51 that bend towards the body 1. Each bent section 51 has a vertically fixed insertion post 52. The bottom front of the body 1 has slots 11 that vertically correspond to the two insertion posts 52. Each insertion post 52 is inserted into its corresponding slot 11 and fixed to the body 1. Casters 53 are fixed to the front side of the connection point between each bent section 51 and the secondary grip 5. With this structure, after the insertion posts and slots are engaged, and the insertion posts… Once fixed to the main body, the auxiliary handle can be reliably fastened to the main body. The plug-in post can be fixed to the main body with fastening bolts, and the auxiliary handle has the advantage of being easy to disassemble from the main body. In addition, by fixing casters to the front side of the connection between each bending section and the auxiliary handle, when the stair climber needs to be moved, the rear end of the main body can be lifted. At this time, the casters can support the ground, which facilitates the movement of the stair climber. When the stair climber is moved to the target position and the main body is returned to a horizontal state, the casters can be lifted off the ground.

[0028] Each foot pedal mechanism 4 includes a guide rail 41, a sliding seat 42, and a foot pedal assembly. The guide rail 41 is fixed to the body 1 and extends from front to back. The left and right sides of the guide rail 41 are provided with grooves 411 extending along the length of the guide rail 41. The left and right sides of the sliding seat 42 are provided with roller sets, and each roller set rolls in the corresponding groove 411. By adopting the above structure, the foot pedal assembly is slidably connected to a single guide rail by the cooperation of two roller sets and two grooves. Thus, when the foot pedal assembly slides along the guide rail, it can effectively avoid the foot pedal assembly from tilting or getting stuck, thereby improving the reliability and stability of the foot pedal assembly sliding on the guide rail. At the same time, when the two foot pedal assemblies slide alternately back and forth along the two guide rails, the parallelism of the two foot pedal assemblies relative to the guide rails can be guaranteed.

[0029] Each roller assembly includes two rollers 43 spaced apart front and rear. The two rollers 43 in each roller assembly are rotatably connected to the front end and rear end of the sliding seat 42, respectively. The two rollers 43 in each roller assembly are rolled in the corresponding grooves 411. With this structure, the two rollers in each roller assembly can provide reliable support for the front and rear ends of the sliding seat, so as to ensure the smoothness of the sliding seat when it slides along the length of the sliding seat.

[0030] Vertical edges 412 are provided at the top and bottom of the openings on the side of each slide groove 411. The vertical edges 412 are used to abut against the outer surface of the outer edge of the roller 43 to prevent the roller 43 from laterally dislodging from the slide groove 411. With this structure, the vertical edges can prevent the roller from laterally dislodging from the slide groove, thereby further improving the reliability and stability of the sliding seat when it slides on the guide rail by relying on the roller.

[0031] The foot pedal assembly includes a pedal 44, a rotating frame 45, and a support frame 46. The pedal 44 is fixed to the upper end of the rotating frame 45, and the front end of the rotating frame 45 is rotatably connected to the front end of the support frame 46. The support frame 46 is fixed to a sliding seat 42. An adjustment and locking assembly is movably connected to the support frame 46. The adjustment and locking assembly has an operating end and a locking end. Two locking parts are provided at the front of the rotating frame 45. When the operating end is released to engage the locking end with one of the locking parts, the angle of the pedal 44 is locked in the current state. When the operating end is operated to disengage the locking end from the locking part, the rotating frame 45 and the support frame 46 are unlocked, and the rotating frame 45 can move relative to the support frame 46. Rotate to adjust the angle of pedal 44; by adopting the above-mentioned foot pedal assembly, when it is necessary to adjust the angle of the pedal, simply operate the operating end of the adjustment locking assembly to disengage the locking end of the adjustment locking assembly from the locking part on the current rotating frame, then rotate the pedal and the rotating frame to adjust the angle of the pedal, and finally release the operating end of the adjustment locking assembly to lock the locking end of the adjustment locking assembly with another locking part on the rotating frame, thus locking the pedal angle; compared with the method of adjusting the pedal angle by plugging in the pin and socket in the current stair climber on the market, it has the advantages of convenient pedal angle adjustment and locking.

[0032] The adjustment locking assembly includes a movable frame 47 and a reset unit. The movable frame 47 is connected to the support frame 46 and can move relative to the support frame 46. The front end of the movable frame 47 has two symmetrically arranged locking parts, which form the locking end of the adjustment locking assembly. The rear end of the movable frame 47 has an operating handle 471, which forms the operating end of the adjustment locking assembly. The rotating frame 45 has two symmetrically arranged first slots 451 and two symmetrically arranged second slots 452. The two first slots 451 form one locking part, and the two second slots 452 form the other locking part. The two locking parts are used to engage with either the two first slots 451 or the two second slots 452. The reset unit is located between the front end of the movable frame 47 and the front end of the support frame 46. When the operating handle 471 is released, the reset unit drives the movable frame 47 to move and reset relative to the support frame 46. With this adjustment and locking assembly, when the operating handle is operated to disengage the two locking parts from the two first locking slots and the two second locking slots, the pedal and rotating frame can rotate relative to the support frame. At this time, the pedal angle can be adjusted. When the operating handle is released to engage the two locking parts with the two first locking slots, the pedal angle is locked in the first angle state. When the operating handle is released to engage the two locking parts with the two second locking slots, the pedal angle is locked in the second angle state. Through this structure, the pedal angle can be easily adjusted, and after the pedal angle is adjusted, the pedal can be easily locked.

[0033] The adjustment locking assembly also includes a first slide rod 48 and a second slide rod 49. The first slide rod 48 is horizontally fixed to the front end of the movable frame 47, and the second slide rod 49 is horizontally fixed to the middle of the movable frame 47. The front of the support frame 46 is provided with two left-right symmetrical first slide holes 461, each of which extends horizontally from front to back. The two ends of the first slide rod 48 pass through one of the first slide holes 461 and extend out of the first slide hole 461, slidingly engaging with the first slide hole 461. The two ends of the first slide rod 48 form two locking parts. The rear of the support frame 46 is provided with two left-right symmetrical second slide holes 462, each of which gradually slopes downward from front to back. The two ends of the second slide rod 49 slidely engage with one of the second slide holes 462. With this structure, when the operating handle is pressed, the movable frame can move backward relative to the support frame. At this time, the two ends of the first slide rod can disengage from the two first locking slots or the two second locking slots. In this state, the rotating frame and the pedal can be unlocked. This structure enables adjustment of the pedal angle. When the operating handle is released, the two ends of the first slide rod engage with the two first slots or the two second slots. When the two ends of the first slide rod engage with the two first slots, the pedal angle is locked in a first angle state. When the two ends of the second slide rod engage with the two second slots, the pedal angle is locked in a second angle state. This structure allows for convenient adjustment of the pedal angle and easy locking of the pedal after adjustment. The reset unit includes a tension spring 40. One end of the tension spring 40 hooks into the middle of the first slide rod 48, and the other end hooks into the front end of the support frame 46. With this reset unit, when the operating handle is released, the tension spring drives the movable frame to move forward relative to the support frame and reset, allowing the two ends of the first slide rod to engage with the two first slots or the two second slots, thereby locking the pedal angle in a first or second angle state. This reset unit has the advantage of simple structure.

[0034] The handrail assembly 3 includes a handrail 31 and two uprights 32. Both ends of the handrail 31 are fixed to the upper ends of one of the uprights 32, and the lower ends of the two uprights 32 are rotatably connected to the left and right sides of the front end of the machine body 1. An angle adjustment structure is provided between the lower end of each upright 32 and the machine body 1, and the two angle adjustment structures constitute an angle adjustment mechanism. Each angle adjustment structure includes a nut sleeve 33 and a hand-tightening bolt 34. The lower end of the upright 32 is rotatably connected to one side of the machine body 1, the nut sleeve 33 is fixed to the inner side of the machine body 1, and the screw portion 341 of the hand-tightening bolt 34 is axially inserted into the lower end of the upright 32 and threadedly fastened to the nut sleeve 33. The angle adjustment structure also includes a fixed plate 35 and an adjusting plate 36. The fixed plate 35 is fixed to... On the outer wall of the body 1, the adjusting plate 36 is fixed to the inner side of the lower end of the column 32, and the screw part 341 is coaxially and movably inserted in the fixed plate 35 and the adjusting plate 36. The inner wall of the adjusting plate 36 is provided with a pin group 361, and the fixed plate 35 is provided with a number of insertion hole groups 351 distributed at intervals around the circumference of the fixed plate 35. When the pin group 361 is engaged with the insertion hole group 351 at different positions, the column 32 is locked at different angles relative to the body 1. In the above structure, the rotation limit of the adjusting plate and the fixed plate is achieved by the engagement of the pin group and the insertion hole group, that is, the rotation limit of the column and the body is achieved, thereby effectively improving the reliability and stability of the rotation limit between the handrail assembly and the body.

[0035] Each column 32 has a connecting sleeve 37 fixed to its inner side at the lower end. The screw part 341 is coaxially and movably inserted into the connecting sleeve 37. The outer end of the nut sleeve 33 is provided with an annular protrusion 331 that is axially inserted into the fixed plate 35. The annular protrusion 331 is coaxially inserted into the inner end of the connecting sleeve 37 and rotates with the connecting sleeve 37. With this structure, the coaxiality of the column relative to the machine body and the coaxiality of the adjusting plate relative to the fixed plate can be guaranteed when the annular protrusion and the inner end of the connecting sleeve are engaged and rotated. At the same time, in this embodiment, when the hand-tightened nut is loosened, even if the lower end of the column moves away from the machine body, the annular protrusion is always inserted into the inner end of the connecting sleeve and rotates with the connecting sleeve.

[0036] Each angle adjustment structure also includes a spring 38; the spring 38 is sleeved on the screw part 341 located inside the connecting sleeve 37, one end of the spring 38 abuts against the outer end of the annular protrusion 331, and the other end of the spring 38 abuts against the inner side of the outer end of the connecting sleeve 37; with this structure, when the hand-tightening bolt is gradually loosened, under the action of the spring, the spring can automatically push the lower end of the column away from the machine body, thereby facilitating the disengagement of the pin group on the adjustment plate from the insertion hole group on the fixed plate; and since the spring is sleeved on the screw part located inside the connecting sleeve, the column angle adjustment structure has the advantage of high structural compactness.

[0037] A limiting block 362 is provided on the outer peripheral wall of the adjusting plate 36, and a limiting groove 352 is provided on the outer peripheral wall of the fixing plate 35. When the column 32 rotates relative to the machine body 1, the limiting block 362 slides along the extension direction of the limiting groove 352, and the limiting block 362 and the limiting groove 352 are used to limit the rotation range of the column 32 relative to the machine body 1. By adopting this structure, when the column rotates relative to the machine body, the rotation range of the column relative to the machine body can be limited by the cooperation of the limiting block and the limiting groove, thereby avoiding the situation where the column is excessively rotated.

[0038] A stud 342 with an outer diameter smaller than that of the screw part 341 is coaxially provided on the inner end of the screw part 341. A lock nut 39 is threadedly fastened on the stud 342. With this structure, when the hand-tightened bolt is continuously loosened, the lock nut can eventually abut against the inner end of the nut sleeve, thereby preventing the bolt from being completely removed, that is, preventing the loss of the hand-tightened bolt, and preventing the lower end of the column from completely detaching from the machine body.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A stair climber, comprising a body (1), supporting legs (2), a handrail assembly (3), and two foot pedal mechanisms (4); the supporting legs (2) are connected to the bottom of the front side of the body (1) and can rotate and fold or open relative to the body (1); the handrail assembly (3) is rotatably connected to the front end of the body (1); an angle adjustment mechanism is provided between the handrail assembly (3) and the body (1), the angle adjustment mechanism being used to adjust the relative angle between the handrail assembly (3) and the body (1); the two foot pedal mechanisms (4) are connected to the body (1) at left and right intervals and can slide back and forth alternately relative to the body (1); characterized in that: The stair climber also includes a secondary grip (5); the secondary grip (5) is detachably connected to the front end of the body (1); when the body (1) is in a flat position and the user is kneeling on the two foot pedals (4) for prone exercise, the secondary grip (5) is used for the user's hands to hold.

2. The stair-climbing machine according to claim 1, characterized in that: The secondary grip (5) is in the shape of an inverted "U". Both ends of the secondary grip (5) are provided with bent sections (51) that bend toward the side of the body (1). Each of the two bent sections (51) is vertically fixed with a plug post (52). The bottom of the front end of the body (1) is provided with a slot (11) that corresponds vertically to the two plug posts (52). Each plug post (52) is inserted into the corresponding slot (11) and fixed to the body (1). Each bent section (51) is fixed with a caster (53) at the front side of the connection between it and the secondary grip (5).

3. The stair-climbing machine according to claim 1, characterized in that: Each of the foot pedal mechanisms (4) includes a guide rail (41), a sliding seat (42), and a foot pedal assembly; the guide rail (41) is fixed on the body (1) and extends from front to back, and the left and right sides of the guide rail (41) are provided with sliding grooves (411) extending along the length direction of the guide rail (41), and the left and right sides of the sliding seat (42) are provided with roller groups, and each roller group rolls in the corresponding sliding groove (411).

4. The stair-climbing machine according to claim 3, characterized in that: Each roller group includes two rollers (43) spaced apart front and back. The two rollers (43) in each roller group are rotatably connected to the front end and rear end of the sliding seat (42) respectively. The two rollers (43) in each roller group are rolled in the corresponding groove (411).

5. The stair-climbing machine according to claim 4, characterized in that: The top and bottom of the openings located on the side of each groove (411) are provided with vertical edges (412), which are used to abut against the outer surface of the outer edge of the roller (43) to prevent the roller (43) from laterally dislodging from the groove (411).

6. The stair-climbing machine according to any one of claims 3-5, characterized in that: The foot pedal assembly includes a pedal (44), a rotating frame (45), and a support frame (46); the pedal (44) is fixed to the upper end of the rotating frame (45), the front end of the rotating frame (45) is rotatably connected to the front end of the support frame (46), and the support frame (46) is fixed on a sliding seat (42); an adjustment and locking assembly is movably connected to the support frame (46), the adjustment and locking assembly has an operating end and a locking end, and two locking parts are provided at the front of the rotating frame (45); when the operating end is released to allow the locking end to engage with one of the locking parts, the angle of the pedal (44) is locked in the current state; When the operating end is operated to disengage the locking end from the locking part, the rotating frame (45) and the support frame (46) are unlocked, and the rotating frame (45) can rotate relative to the support frame (46) to adjust the angle of the pedal (44).

7. The stair-climbing machine according to claim 6, characterized in that: The adjustment and locking assembly includes a movable frame (47) and a reset unit; the movable frame (47) is connected to the support frame (46) and can move relative to the support frame (46); the front end of the movable frame (47) is provided with two symmetrically arranged latching parts, which form the locking end of the adjustment and locking assembly; the rear end of the movable frame (47) is provided with an operating handle (471), which forms the operating end of the adjustment and locking assembly; the rotating frame (45) is provided with two symmetrically arranged first slots (45... 1) and two second slots (452) that are symmetrical about left and right, the two first slots (451) form one locking part, the two second slots (452) form the other locking part, and the two locking parts are used to engage with the two first slots (451) or the two second slots (452); the reset unit is disposed between the front end of the movable frame (47) and the front end of the support frame (46). When the operating handle (471) is released, the reset unit is used to drive the movable frame (47) to move and reset relative to the support frame (46).

8. The stair-climbing machine according to claim 7, characterized in that: The adjustment and locking assembly further includes a first slide rod (48) and a second slide rod (49); the first slide rod (48) is horizontally fixed to the front end of the movable frame (47), and the second slide rod (49) is horizontally fixed to the middle of the movable frame (47); the front of the support frame (46) is provided with two first sliding holes (461) that are symmetrical about left and right, each first sliding hole (461) extends horizontally from front to back, and the two ends of the first slide rod (48) pass through one of the first sliding holes (461) respectively and extend out of the first sliding hole (461) and are connected to the first sliding hole (461). The first slide rod (48) has two locking parts at both ends; the support frame (46) has two second sliding holes (462) that are symmetrical about left and right at the rear. Each second sliding hole (462) gradually slopes downward from front to back. The two ends of the second slide rod (49) are respectively slidably engaged with one of the second sliding holes (462); the reset unit includes a tension spring (40); one end of the tension spring (40) is engaged with the middle part of the first slide rod (48), and the other end of the tension spring (40) is engaged with the front end of the support frame (46).

9. The stair-climbing machine according to claim 1, characterized in that: The handrail assembly (3) includes a handrail (31) and two uprights (32); the two ends of the handrail (31) are respectively fixed to the upper end of one of the uprights (32), and the lower ends of the two uprights (32) are respectively rotatably connected to the left and right sides of the front end of the body (1). An angle adjustment structure is provided between the lower end of each upright (32) and the body (1), and the two angle adjustment structures constitute the angle adjustment mechanism; each angle adjustment structure includes a nut sleeve (33) and a hand-tightening bolt (34). The lower end of the upright (32) is rotatably connected to one side of the body (1), the nut sleeve (33) is fixed to the inner side of the body (1), and the screw part (341) of the hand-tightening bolt (34) is axially movably inserted through the upright (32). The lower end of the column (32) is threaded and fastened to the nut sleeve (33); the angle adjustment structure also includes a fixed plate (35) and an adjusting plate (36); the fixed plate (35) is fixed on the outer wall of the machine body (1), the adjusting plate (36) is fixed on the inner side of the lower end of the column (32), and the screw part (341) is coaxially and movably inserted in the fixed plate (35) and the adjusting plate (36); the inner wall of the adjusting plate (36) is provided with a pin group (361), and the fixed plate (35) is provided with a number of insertion hole groups (351) spaced apart around the circumferential direction of the fixed plate (35); when the pin group (361) is engaged with the insertion hole group (351) at different positions, the column (32) is locked relative to the machine body (1) at different angles.

10. The stair-climbing machine according to claim 9, characterized in that: Each column (32) has a connecting sleeve (37) fixed on the inner side of its lower end. The screw part (341) is coaxially and movably inserted in the connecting sleeve (37). The outer end of the nut sleeve (33) is provided with an annular protrusion (331) that is axially inserted in the fixed plate (35). The annular protrusion (331) is coaxially inserted in the inner end of the connecting sleeve (37) and rotates with the connecting sleeve (37).

11. The stair-climbing machine according to claim 10, characterized in that: Each of the angle adjustment structures also includes a spring (38); the spring (38) is sleeved on the screw portion (341) located inside the connecting sleeve (37), one end of the spring (38) abuts against the outer end of the annular protrusion (331), and the other end of the spring (38) abuts against the inner side of the outer end of the connecting sleeve (37).

12. The stair-climbing machine according to any one of claims 9-11, characterized in that: A limiting block (362) is provided on the outer peripheral wall of the adjusting plate (36), and a limiting groove (352) is provided on the outer peripheral wall of the fixing plate (35). When the column (32) rotates relative to the machine body (1), the limiting block (362) slides along the extension direction of the limiting groove (352), and the limiting block (362) and the limiting groove (352) are used to limit the rotation range of the column (32) relative to the machine body (1).

13. The stair-climbing machine according to any one of claims 9-11, characterized in that: A stud (342) with an outer diameter smaller than that of the screw part (341) is coaxially provided on the inner end of the screw part (341), and a lock nut (39) is threaded on the stud (342).

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