Adjustable chest expander

Abstract

The utility model relates to an adjustable chest expander, which comprises a box body, a resistance unit and an adjusting unit, the resistance unit comprises a central shaft arranged in the box body, a volute spiral spring with one end fixed on the central shaft and a tension rope for storing force through the volute spiral spring, and the adjusting unit comprises a worm wheel arranged on the central shaft and a worm meshed with the worm wheel. And the knob is used for driving the worm to rotate and is positioned on the outer side of the box body. According to the utility model, the wire wheel and the rotary elastic piece are arranged to serve as resistance of the pull rope, the central shaft and the worm gear are arranged in the middle of the volute spiral spring, and the worm drives the worm gear to rotate, so that the rotation resistance of the wire wheel is adjusted, and the worm is used for adjusting without locking; the adjusting efficiency can be improved by means of the reverse rotation self-locking function of the threads.

Description

Technical Field

[0001] The utility model belongs to the field of fitness equipment, and in particular relates to an adjustable tensioner. Background Art

[0002] Home portable pullers are used to exercise hand strength. Common pullers include a box, a resistance unit built into the box, and a gear adjustment unit. The resistance unit passes through the box through a tension rope to facilitate training, and the adjustment unit is used to adjust the initial position of the resistance element to change the gear of the resistance.

[0003] In common tensioner devices, the gear adjustment requires the following operations: releasing the fixed end of the resistance element, changing the gear by adjusting the fixed end, and fixing the fixed end of the resistance element after the gear adjustment again so that the fixed end of the resistance element can be subjected to force. This adjustment method does not have a self-locking structure and the operation is relatively complicated. Utility Model Content

[0004] The purpose of the utility model is to provide an adjustable tensioner in order to solve the above problems.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] An adjustable tensioner includes a housing, a resistance unit and an adjustment unit, wherein the resistance unit includes a central axis arranged in the housing, a spiral spring with one end fixed to the central axis, and a tension rope storing force through the spiral spring, and the adjustment unit includes a worm wheel arranged on the central axis, a worm meshing with the worm wheel, and a knob driving the worm to rotate, wherein the knob is located on the outside of the housing.

[0007] As a further optimization scheme of the utility model, the resistance unit also includes a pulley, and the end of the spiral spring away from the center axis is fixedly connected to the pulley, one end of the tension rope is wound around the pulley, and the other end passes through the outside of the box body. When in use, the spiral spring provides resistance to the tension rope, and the pulley can increase the retraction and release stroke of the tension rope.

[0008] As a further optimization scheme of the utility model, a strip-shaped observation groove is provided on the box body, and an identification unit is provided in the box body. The identification unit includes an identification piece, a threaded rod that drives the identification piece to move in the area of ​​the observation groove by rotation, and a gear assembly connected to the threaded rod. The gear assembly is also connected to the worm to drive the threaded rod and the worm to rotate synchronously. In order to facilitate the observation of the adjustment degree, the identification unit is set for observation. By setting the identification piece and the observation groove, the second gear shaft can drive the identification piece to move through the threaded sliding device when it rotates, so that the identification piece is in different positions in the observation groove, so as to facilitate the knowledge of the resistance size after adjustment.

[0009] As a further optimization scheme of the utility model, the gear assembly includes a first gear shaft that drives the worm to rotate and a second gear shaft that drives the threaded rod to rotate. A transmission gear shaft is provided between the first gear shaft and the second gear shaft. The gears of the first gear shaft and the second gear shaft are respectively meshed with the gears of the transmission gear shaft. Since an identification unit is provided, in order to make the identification unit run synchronously with the first gear shaft, an engaging structure is provided between the first gear shaft and the second gear shaft. Since the rotation speed requirements of the threaded rod and the worm are different, the first gear shaft and the second gear shaft are not directly meshed. Instead, a force transmission gear shaft is provided between the two for changing speed when the threaded rod and the worm rotate synchronously.

[0010] As a further optimization solution of the present invention, the end of any one of the first gear shaft, the second gear shaft and the transmission gear shaft extends to the outside of the box body and is connected to the knob.

[0011] As a further optimization solution of the present invention, the box body includes a cover plate, and the observation slot is arranged on the cover plate to facilitate observation from the outside.

[0012] As a further optimization scheme of the utility model, the box body is provided with a first chamber and a second chamber, which are respectively used to accommodate the resistance unit and the adjustment unit. The central axis runs through the first chamber and the second chamber. The resistance unit and the adjustment unit are separated by the internal partition of the box body, and only the central axis is retained connected, which can prevent the resistance unit and the adjustment unit from interfering with each other during operation.

[0013] As a further optimization scheme of the utility model, a handle is provided at one end of the tension rope located outside the box, and a handle strap is provided on the side of the box away from the handle. The handle is used for convenient holding, and the handle strap can be tied to a suitable position for fixation as needed, or the handle strap can be held with the other hand.

[0014] The beneficial effects of the utility model are:

[0015] The utility model arranges a wire wheel and a rotating elastic member as the resistance of the tension rope, and arranges a central axis and a worm wheel in the middle part of the scroll spring, and further drives the worm wheel to rotate through the worm, so as to adjust the resistance of the wire wheel rotation. The worm does not need to be locked when adjusting, and the reverse self-locking function of the thread itself is relied on to improve the adjustment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of the overall structure of the utility model.

[0017] Figure 2 It is the overall structural front view of the utility model.

[0018] Figure 3The utility model Figure 2 Center AA view.

[0019] Figure 4 The utility model Figure 2 Middle BB view.

[0020] Figure 5 This is a structural view of the worm gear of the present utility model.

[0021] In the figure: 1. box body; 11. first chamber; 12. second chamber; 13. cover plate; 14. observation slot; 2. resistance unit; 21. volute spring; 22. reel; 23. tension rope; 24. handle; 25. center axis; 3. adjustment unit; 31. knob; 32. first gear shaft; 33. second gear shaft; 34. worm; 35. transmission gear shaft; 36. worm wheel; 4. identification unit; 41. threaded rod; 42. identification sheet; 5. handle strap. DETAILED DESCRIPTION

[0022] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0023] Example 1

[0024] like Figure 1-5 As shown, an adjustable tensioner includes a housing 1, a resistance unit 2 and an adjustment unit 3, the resistance unit 2 includes a central axis 25 arranged in the housing 1, a spiral spring 21 with one end fixed to the central axis 25, and a tension rope 23 storing force through the spiral spring 21, the adjustment unit 3 includes a worm wheel 36 arranged on the central axis 25, a worm 34 meshing with the worm wheel 36, and a knob 31 driving the worm 34 to rotate, and the knob 31 is located on the outside of the housing 1.

[0025] The resistance unit 2 also includes a pulley 22, and the end of the spiral spring 21 away from the central axis 25 is fixedly connected to the pulley 22. One end of the tension rope 23 is wound around the pulley 22, and the other end passes through the outside of the box body 1. When in use, the spiral spring 21 provides resistance to the tension rope 23, and the pulley 22 can increase the retraction and extension stroke of the tension rope 23.

[0026] A strip-shaped observation slot 14 is provided on the housing 1, and an identification unit 4 is provided in the housing 1. The identification unit 4 includes an identification piece 43, a threaded rod 41 that drives the identification piece 43 to move in the area of ​​the observation slot 14 by rotation, and a gear assembly connected to the threaded rod 41. The gear assembly is also connected to the worm 34 to drive the threaded rod 41 and the worm 34 to rotate synchronously. In order to facilitate the observation of the adjustment degree, the identification unit 4 is set for observation. By setting the identification piece 43 and the observation slot 14, the second gear shaft 33 can drive the identification piece 43 to move through the threaded sliding device when it rotates, so that the identification piece 43 is at different positions in the observation slot 14, so as to facilitate the knowledge of the resistance size after adjustment.

[0027] The gear assembly includes a first gear shaft 32 that drives the worm 34 to rotate and a second gear shaft 33 that drives the threaded rod 41 to rotate. A transmission gear shaft 35 is provided between the first gear shaft 32 and the second gear shaft 33. The gears of the first gear shaft 32 and the second gear shaft 33 are respectively meshed with the gears of the transmission gear shaft 35. Since an identification unit 4 is provided, a meshing structure is provided between the first gear shaft 32 and the second gear shaft 33 in order to make the identification unit 4 run synchronously with the first gear shaft 32. Since the rotation speed requirements of the threaded rod 41 and the worm 34 are different, the first gear shaft 32 and the second gear shaft 33 are not directly meshed, but a force transmission gear shaft 35 is provided between the two for changing the speed when the threaded rod 41 and the worm 34 rotate synchronously.

[0028] An end of any one of the first gear shaft 32 , the second gear shaft 33 and the transmission gear shaft 35 extends to the outside of the housing 1 and is connected to the knob 31 .

[0029] The box body 1 includes a cover plate 13 , and an observation slot 14 is disposed on the cover plate 13 for convenient observation from the outside.

[0030] The box body 1 is provided with a first chamber 11 and a second chamber 12, which are respectively used to accommodate the resistance unit 2 and the adjustment unit 3. The central axis 25 runs through the first chamber 11 and the second chamber 12. The resistance unit 2 and the adjustment unit 3 are separated by the internal partition of the box body 1, and only the central axis 25 is retained to be connected, which can prevent the resistance unit 2 and the adjustment unit 3 from interfering with each other during operation.

[0031] A handle 24 is provided at one end of the pulling rope 23 outside the box body 1, and a handle strap 5 is provided on the side of the box body 1 away from the handle 24. The handle 24 is used for easy holding. The handle strap 5 can be tied to a suitable position for fixing as needed, or the handle strap 5 can be held with the other hand.

[0032] The specific implementation method is as follows: when in use, the central shaft 25 is driven to rotate by rotating the knob 31, so that the initial position of the spiral spring 21 is changed, thereby adjusting the rotational resistance of the wire wheel 22, and when the second gear shaft 33 rotates, the resistance adjustment status can be observed through the identification unit 4.

[0033] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. An adjustable tensioner, characterized in that: The invention comprises a housing (1), a resistance unit (2) and an adjustment unit (3); the resistance unit (2) comprises a central shaft (25) arranged in the housing (1), a spiral spring (21) with one end fixed on the central shaft (25), and a tension rope (23) storing force through the spiral spring (21); the adjustment unit (3) comprises a worm gear (36) arranged on the central shaft (25), a worm (34) meshing with the worm gear (36), and a knob (31) driving the worm (34) to rotate; the knob (31) is located outside the housing (1).

2. An adjustable tensioner according to claim 1, characterized in that: The resistance unit (2) further comprises a wire wheel (22), the end of the spiral spring (21) away from the central axis (25) being fixedly connected to the wire wheel (22), one end of the tension rope (23) being wound around the wire wheel (22), and the other end being passed through the outside of the box (1).

3. The adjustable tensioner according to claim 1, characterized in that: The box body (1) is provided with a strip-shaped observation slot (14), and the box body (1) is provided with an identification unit (4), the identification unit (4) comprising an identification sheet (43), a threaded rod (41) which drives the identification sheet (43) to move within the observation slot (14) by rotation, and a gear assembly connected to the threaded rod (41), the gear assembly also being connected to a worm (34) to drive the threaded rod (41) to rotate synchronously with the worm (34).

4. The adjustable tensioner according to claim 3, characterized in that: The gear assembly comprises a first gear shaft (32) for driving a worm (34) to rotate and a second gear shaft (33) for driving a threaded rod (41) to rotate, a transmission gear shaft (35) is provided between the first gear shaft (32) and the second gear shaft (33), and the gears of the first gear shaft (32) and the second gear shaft (33) are respectively meshed with the gears of the transmission gear shaft (35).

5. The adjustable tensioner according to claim 4, characterized in that: The end of any one of the first gear shaft (32), the second gear shaft (33) and the transmission gear shaft (35) extends to the outside of the box body (1) and is connected to the knob (31).

6. The adjustable tensioner according to claim 3, characterized in that: The box body (1) comprises a cover plate (13), and an observation slot (14) is arranged on the cover plate (13).

7. The adjustable tensioner according to claim 1, characterized in that: The box body (1) is provided with a first chamber (11) and a second chamber (12) for accommodating the resistance unit (2) and the adjustment unit (3) respectively, and the central axis (25) passes through the first chamber (11) and the second chamber (12).

8. The adjustable tensioner according to claim 1, characterized in that: A handle (24) is provided at one end of the pulling rope (23) located outside the box body (1), and a handle belt (5) is provided at a side of the box body (1) away from the handle (24).

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