Resistance adjustable exercise apparatus

Abstract

The present application relates to the technical field of fitness equipment, and particularly relates to a resistance-adjustable fitness equipment, which comprises a resistance unit, a winding unit and a resistance adjusting unit, the resistance unit is an elastic element and externally forms a ratchet structure, and the resistance unit is used for providing training resistance; the winding unit is connected with the resistance unit; the resistance adjusting unit comprises a linear driving mechanism, a pawl and a torsional spring, the pawl is engaged with the ratchet structure, and the pawl and the torsional spring are installed on a shaft. The present application drives the linear driving mechanism to exert an oblique thrust on the pawl by external force, so that the pawl is disengaged from the ratchet, thereby realizing the adjustment of resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fitness equipment, in particular to a fitness equipment with adjustable resistance. BACKGROUND

[0002] Currently, the parts providing elastic force through torsion, such as clockwork spring, volute spring and other parts made of pre-tensioned metal belt, have been widely used in industrial and life scenes. The characteristic of such parts is that the material produces bending elastic deformation under the action of torque, which produces torsion in the plane, and the size of the deformation angle is proportional to the torque, and it can return to the initial state after the external force is removed. In strength training, the use of such parts providing elastic force through torsion can effectively reduce the weight and floor area of the equipment.

[0003] The biggest disadvantage of such parts providing elastic force through torsion, such as clockwork spring and volute spring, is that the resistance is not easy to adjust. Based on this, we propose a fitness equipment with adjustable resistance. SUMMARY

[0004] The present application solves the problem of inconvenient resistance adjustment of fitness equipment providing elastic force through torsion in the related art, and proposes a fitness equipment with adjustable resistance. The oblique pushing force is applied to the pawl by the straight-line driving mechanism driven by external force, so that the pawl and the ratchet wheel are disengaged, to realize the adjustment of resistance.

[0005] To solve the above technical problems, the present application is realized by the following technical scheme: a fitness equipment with adjustable resistance, comprising:

[0006] A resistance unit, which is an elastic element and forms a ratchet structure outside, is used to provide training resistance;

[0007] A winding unit connected with the resistance unit;

[0008] A resistance adjustment unit, which comprises a straight-line driving mechanism, a pawl and a torsion spring, the pawl is engaged with the ratchet structure, and the pawl and the torsion spring are installed on the shaft.

[0009] As a preferred scheme, the resistance unit comprises a clockwork spring, a plurality of clockwork boxes, a clockwork box cover and a transmission shaft, both ends of the transmission shaft are installed on the support plate through bearings; the clockwork spring is installed in the clockwork box, both ends of the clockwork box are connected with the transmission shaft through bearings, and the outside of the clockwork box forms a ratchet structure; the clockwork box remains relatively stationary with the support plate through the cooperation of the external ratchet structure and the pawl, and the clockwork box and the clockwork box cover are connected through a countersunk screw.

[0010] As a preferred scheme, one end of the transmission shaft is spline-shaped, the other end is cylindrical and has a slit, and the inner end of the spring is connected to the transmission shaft through the slit.

[0011] As a preferred scheme, the winding unit comprises a winding wheel, a nut sleeve, a flexible rope and an external force source, the winding wheel is installed at one end of the transmission shaft, the winding wheel comprises a tapered winding part and a cylindrical screw part, the tapered winding part is provided with a spiral groove on the surface, and the cylindrical screw part is externally threadedly connected with the nut sleeve; the flexible rope is wound on the tapered winding part and connected with the external force source.

[0012] As a preferred scheme, the winding wheel is internally provided with a spline groove, and the winding wheel is connected with the spline-shaped end of the transmission shaft through the spline groove; the two ends of the nut sleeve are fixed on the support plate through screws.

[0013] As a preferred scheme, the linear driving mechanism comprises a driving mechanism, a gear and a rack in engagement, the gear is driven by the driving mechanism, the gear is fixed with a retreat-stop ring above and a check ring below, and the rack is installed through a fixing block and provided with limit grooves at two ends.

[0014] As a preferred scheme, the linear driving mechanism comprises a driving mechanism, a screw rod and a nut in threaded connection.

[0015] As a preferred scheme, the linear driving mechanism comprises a driving mechanism, a linear motion rod and a cam, and the linear motion rod is provided with a plurality of grooves.

[0016] As a preferred scheme, the linear driving mechanism comprises a driving mechanism, a guide rail and a push rod in sliding connection, the push rod is provided with a boss, and the driving mechanism drives the boss to push the push rod to make linear motion on the guide rail.

[0017] Compared with the prior art, the beneficial effects of the present application are as follows: the linear driving mechanism is driven by external force to exert an oblique pushing force on the pawl, so that the pawl is disengaged from the ratchet wheel, and the resistance is adjusted; in addition, the adjustment accuracy of the resistance depends on the resistance size that each elastic element can provide by torsion; the resistance curve of the elastic element can be limited by controlling the size of the elastic element, so that obvious force change is not felt during strength training. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of embodiment 1 of the present application;

[0019] Figure 2 is a schematic diagram of the overall structure of embodiment 1 of the present application;

[0020] Figure 3is the overall structure schematic view of embodiment 1 of the present application;

[0021] Figure 4 is the front view of embodiment 1 of the present application;

[0022] Figure 5 is the structure schematic view of the resistance unit of the present application;

[0023] Figure 6 is the structure schematic view of the transmission shaft of the present application;

[0024] Figure 7 is the structure schematic view of the winding wheel of the present application;

[0025] Figure 8 is the partial structure schematic view of embodiment 2 of the present application;

[0026] Figure 9 is the structure schematic view of embodiment 5 of the present application;

[0027] Figure 10 is the overall structure schematic view of embodiment 7 of the present application;

[0028] Figure 11 is the connection relationship schematic view of the guide rail, the push rod and the boss of embodiment 7 of the present application;

[0029] Figure 12 is the connection relationship schematic view of the guide rail, the push rod and the boss of embodiment 7 of the present application.

[0030] In the figure:

[0031] 1, fixed support, 101, support plate, 102, fixed block, 103, frame, 2, resistance unit, 201, clock spring, 202, clock spring box, 203, clock spring box cover, 204, transmission shaft, 3, winding unit, 301, winding wheel, 3011, tapered winding part, 3012, cylindrical screw part, 302, nut sleeve, 303, flexible rope, 304, external force source, 4, resistance adjusting unit, 401, driving mechanism, 402, gear, 403, rack, 404, check ring, 405, retreat ring, 405, linear motion rod, 406, cam, 407, pawl, 408, torsional spring, 409, guide rail, 410, push rod, 411, boss. DETAILED DESCRIPTION

[0032] Clearly, only the embodiments described are merely a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one example embodiment is merely illustrative in nature and is in no way intended to limit the application or its applications or uses. Based upon the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of the present application.

[0033] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0034] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application, unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale as the dimensions of the parts shown are for the purpose of illustration and description only. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail, but are to be considered as part of the description of the application. In all examples shown and discussed herein, any specific values are to be interpreted as illustrative only and not as a limitation. Thus, other examples of the example embodiments can have different values. It is to be noted that like numbers and letters refer to like elements throughout the several views of the drawings and that one or more specific embodiments thereof can be shown in the drawings and described below.

[0035] In the description of the application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the scope of protection of the application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0036] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0037] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0038] Example 1

[0039] like Figures 1 to 6 As shown, a fitness device with adjustable resistance includes a fixed support 1, a resistance unit 2, a winding unit 3, and a resistance adjustment unit 4.

[0040] The fixed bracket 1 is used to install and fix other units. The fixed bracket 1 includes a support plate 101, a fixing block 102 and a frame 103. The support plate 101 is fixed inside the frame 103 by welding or threaded connection.

[0041] Resistance unit 2 is an elastic element with an external ratchet structure. Resistance unit 2 provides training resistance. Specifically, resistance unit 2 includes a spring 201, several spring boxes 202, a spring box cover 203, and a drive shaft 204. Both ends of the drive shaft 204 are mounted on the support plate 101 via bearings. The spring 201 is installed inside the spring boxes 202, and both ends of the spring boxes 202 are connected to the drive shaft 204 via bearings. A ratchet structure is formed on the outside of the spring boxes 202. Structurally, the mainspring barrel 202 is kept relatively stationary with respect to the support plate 101 by the engagement of the ratchet structure on its exterior and the pawl 407. The mainspring barrel 202 and the mainspring barrel cover 203 are connected by countersunk screws, and both the mainspring barrel 202 and the mainspring barrel cover 203 have holes in their centers for the bearing and the drive shaft 204 to pass through. In addition, one end of the drive shaft 204 is splined, and the other end is cylindrical with a slit. The inner end of the mainspring spring 201 is connected to the drive shaft 204 through the slit.

[0042] The winding unit 3 is connected with the resistance unit 2; specifically, the winding unit 3 comprises a winding wheel 301, a nut sleeve 302, a flexible rope 303 and an external force source 304, the winding wheel 301 is installed at one end of the transmission shaft 204, wherein a spline groove is formed in the winding wheel 301, and a spline is arranged on the transmission shaft 204, and the winding wheel 301 is connected with the transmission shaft 204 through the spline groove and the spline; the winding wheel 301 comprises a tapered winding part 3011 and a cylindrical screw part 3012, the taper of the tapered winding part 3011 is used to balance the resistance of the clockwork spring 201 which increases with the increase of the deformation amount, a spiral groove is formed on the surface of the tapered winding part 3011, the cylindrical screw part 3012 is externally threaded connected with the nut sleeve 302, and the two ends of the nut sleeve 302 are respectively connected and fixed on the support plate 101 through screws, so that deformation is prevented when force is applied; the flexible rope 303 is wound in the threaded groove of the tapered winding part 3011 and is connected with the external force source 304, and the flexible rope 303 provides torque to the winding wheel 301.

[0043] The resistance adjusting unit 4 comprises a linear driving mechanism, a pawl 407 and a torsional spring 408, the linear driving mechanism is a meshing gear 402 and a rack 403 (wherein the gear 402 is a full gear), the gear 402 is driven through a driving mechanism 401, wherein the driving mechanism 401 adopts an adjusting knob, the bottom end of the adjusting knob is connected with the gear 402 through a D-shaped shaft and can output torque to the gear 402, the gear 402 is fixed with a retreat stop ring 405 above and a check ring 404 below, so as to limit the translational motion of the gear 402, so that the gear 402 can only rotate but cannot move horizontally; the rack 403 is installed through the fixed block 102 and the two ends of the rack 403 are provided with limiting grooves to prevent the rack 403 from falling; the support plate 101 is provided with a shaft, the pawl 407 and the torsional spring 408 are installed on the shaft, the pawl 402 is kept in meshing with the ratchet structure on the clockwork box 202 under the elastic force of the torsional spring 408, a small circular groove is arranged on one side surface of the pawl 407, and when the rack 403 abuts against the pawl 407, an upward inclined force can be provided to make the pawl 407 disengage from the ratchet on the clockwork box 202.

[0044] The working principle is as follows:

[0045] The knob is adjusted to drive the gear 402 to rotate but not to move, so that the rack 403 moves horizontally relative to the gear 402, the support plate 101 is provided with an avoiding hole for the rack 403 to pass through, and when the rack 403 moves to abut against the pawl 407, an upward inclined force can be provided to make the pawl 407 disengage from the ratchet wheel on the clockwork box 202, so as to control the size of the resistance to realize the adjustment of the resistance. When the external force of the external force source 304 acts, the flexible rope 303 drives the winding wheel 301 to rotate, and the winding wheel 301 also moves horizontally along the nut sleeve 302 under the action of the cylindrical screw rod part 3012 of the winding wheel 301, so as to ensure that the position of the flexible rope 303 connected with the external force source 304 does not change. At this time, the winding wheel 301 drives the clockwork spring 201 to deform through the transmission shaft 204 to generate resistance. In this process, since the taper of the winding wheel 301 is designed according to the elastic properties of the clockwork spring 201, with the horizontal movement of the winding wheel 301, the radius of the cross section circle providing torque to the external force source 304 is continuously increased, which can offset the increase of the elastic force of the clockwork spring 201 due to the deformation, and realize the relatively constant resistance provided for the trainer to train.

[0046] Embodiment 2

[0047] As shown in Figure 8 Unlike embodiment 1, the gear 402 is an incomplete gear, that is, intermittent motion can be realized. The number of revolutions of the incomplete gear is controlled to realize the adjustment of the resistance.

[0048] Embodiment 3

[0049] Unlike embodiment 1, the driving mechanism 401 adopts a motor, and the driving shaft of the motor is connected with the gear 402 through a D-shaped shaft.

[0050] Embodiment 4

[0051] Unlike embodiment 1, the linear driving mechanism adopts a threaded rod and a nut in threaded connection, and the nut is also limited from moving horizontally by the retainer ring 405 and the check ring 404, the driving mechanism 401 can adopt a motor or a knob, and the subsequent working principle is the same as that of embodiment 1, which will not be repeated here.

[0052] Embodiment 5

[0053] As shown in Figure 9As shown, unlike Embodiment 1, the linear drive mechanism uses a linear motion rod 405 and a cam 406. The linear motion rod 405 has several grooves. The cam 406 rotates under the drive of the adjustment knob or the motor. When its protruding end enters the groove of the linear motion rod 405, it pushes the linear motion rod 405 to make a linear motion, thereby resisting the pawl 407. The subsequent working principle is the same as that of Embodiment 1, and will not be repeated here. The stroke of each linear motion depends on the depth of the groove in the linear motion rod 405.

[0054] Example 6

[0055] Unlike Embodiment 5, cam 406 is replaced with a Geneva mechanism.

[0056] Example 7

[0057] like Figures 10 to 12 As shown, unlike Embodiment 1, the linear drive mechanism consists of a slidingly connected guide rail 409 and a push rod 410. The push rod 410 is driven by a drive mechanism 401. In this embodiment, the drive mechanism 401 uses external force. One end of the push rod 410 is vertically provided with a boss 411. The upper and lower sides of the guide rail 409 form groove structures. One end of the push rod 410 is vertically upwardly formed with a mounting part that matches the groove structures on both sides of the guide rail 409. The mounting part extends upward to form a boss 411. The push rod 410 is mounted on the guide rail 409 through the mounting part at one end. External force is applied to the drive boss 411, thereby pushing the push rod 410 to make linear motion on the guide rail 409. The distance of the linear motion directly controls the number of springs 201 that enter the working state, thereby realizing the adjustment of resistance.

[0058] The above are preferred embodiments of the present invention. Those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments described above. Any obvious improvements, substitutions or modifications made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. An adjustable resistance exercise machine, comprising: It includes: Resistance unit (2), the resistance unit (2) is an elastic element and externally forms a ratchet structure, the resistance unit (2) is used to provide training resistance, the resistance unit (2) includes a clockwork spring (201), a plurality of clockwork boxes (202), a clockwork box cover (203) and a transmission shaft (204), both ends of the transmission shaft (204) are installed on the support plate (101) through bearings;The clockwork spring (201) is installed in the clockwork box (202), both ends of the clockwork box (202) are connected with the transmission shaft (204) through bearings, and the clockwork box (202) externally forms a ratchet structure, the clockwork box (202) is kept relatively stationary with the support plate (101) by the cooperation of the external ratchet structure and the pawl (407), the clockwork box (202) is connected with the clockwork box cover (203) through a countersunk screw; Winding unit (3), the winding unit (3) is connected with the resistance unit (2); Resistance adjusting unit (4), the resistance adjusting unit (4) includes a linear drive mechanism, a pawl (407) and a torsion spring (408), the pawl (407) is engaged with the ratchet structure, the pawl (407) and the torsion spring (408) are installed on the shaft, the linear drive mechanism includes a drive mechanism (401), a gear (402) and a rack (403) engaged with each other, the gear (402) is driven by the drive mechanism (401), the gear (402) is fixed with a stop ring above and a check ring (404) below, the rack (403) is installed through a fixed block (102) and both ends of the rack (403) are provided with limiting grooves; By adjusting the knob to drive the gear (402) to rotate but not move, so that the rack (403) moves horizontally relative to the gear (402), the support plate (101) is provided with an avoidance hole for the rack (403) to pass through, when the rack (403) moves to resist the pawl (407), an upward inclined force can be provided to make the pawl (407) and the ratchet on the clockwork box (202) disengage.

2. Adjustable resistance exercise apparatus according to claim 1, characterized in that: One end of the transmission shaft (204) is spline-shaped, the other end is cylindrical and has a slit, the inner end of the clockwork spring (201) is connected with the transmission shaft (204) through the slit.

3. The adjustable resistance exercise apparatus of claim 1 wherein: The winding unit (3) includes a winding wheel (301), a nut sleeve (302), a flexible rope (303) and an external force source (304), the winding wheel (301) is installed at one end of the transmission shaft (204), the winding wheel (301) includes a conical winding part (3011) and a cylindrical screw part (3012), the surface of the conical winding part (3011) is provided with a spiral groove, the cylindrical screw part (3012) is externally threaded connected with the nut sleeve (302);The flexible rope (303) is wound on the conical winding part (3011) and connected with the external force source (304).

4. Adjustable resistance exercise apparatus according to claim 3, wherein: The winding wheel (301) is internally provided with a spline groove, and is connected with a spline-shaped end of a transmission shaft (204) through the spline groove.

5. The adjustable resistance exercise apparatus of claim 1 wherein: The linear driving mechanism comprises a driving mechanism (401), a screw rod and a nut in threaded connection.

6. The adjustable resistance exercise apparatus of claim 1 wherein: The linear driving mechanism comprises a driving mechanism (401), a linear motion rod (405) and a cam (406), and a plurality of grooves are formed in the linear motion rod (405).

7. The adjustable resistance exercise apparatus of claim 1 wherein: The linear driving mechanism comprises a driving mechanism (401), a slidingly connected guide rail (409) and a push rod (410), the push rod (410) is provided with a boss (411), and the driving mechanism (401) drives the boss (411) to push the push rod (410) to do linear motion on the guide rail (409).

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