Adjustable rock arm of a climbing treadmill

Description

BACKGROUND OF THE INVENTION

The present invention is related to a climbing treadmill, and more particularly to an adjustable rock arm of a climbing treadmill. The slope of the climbing treadmill is adjustable and the resistance against the rock arm is also adjustable in accordance with the slope and the natural swinging arch of a user's arms for exercising the arms to different extent.

FIG. 6 shows a conventional treadmill including a mainframe 61, a frame body 62, a front support 63 and a rear support 64. An electronic control instrument is disposed on the mainframe 61. Two handles bars 66 are mounted on two sides of the mainframe 61. The frame body 62 is looped with a running belt which revolves around the frame body 62. In addition, two rock arm assemblies 67 are respectively pivotally mounted on two pivot shafts 68 of front side of the mainframe 61 near upper end thereof. The two rock arm assemblies 67 have the same structure. Each rock arm assembly 67 includes a rotary bar 69 and a holding rock arm 70 having a holding end. One end of the rotary bar 69 is pivotally connected with a corresponding pivot shaft of the mainframe 61, while the other end of the rotary bar 69 is pivotally connected with one end of the holding rock arm 60. A cord-like resilient member 71 is additionally disposed between the rotary bar 69 and the bottom of the frame body 62 for providing a certain resistance against the holding rock arm 70. According to the above structure, a user cannot easily operate the treadmill and it is inconvenient to adjust the resistance. Moreover, the cord-like resilient member 71 tends to be clogged by an alien article. This will lead to malfunction of the treadmill. Furthermore, the structure of the treadmill is complicated and hard to manufacture or assemble.

SUMMARY OF THE INVENTION

It is therefore a primary object of the present invention to provide an adjustable rock arm of a climbing treadmill. The slope of the climbing treadmill is adjustable and the resistance against the rock arm is also adjustable in accordance with the slope and the natural swinging arch of a user's arms for exercising the arms to different extent.

According to the above object, the adjustable rock arm of the climbing treadmill of the present invention includes a swinging unit including a rock arm and an oil cylinder. A rear end of the rock arm via a shaft is pivotally connected with the upright support. The oil cylinder is disposed under the rock arm. By means of a fixing jacket, an upper end of the oil cylinder is connected with the rock arm. A lower end of the oil cylinder via a fixing member is fixed on an upright support.

The present invention can be best understood through the following description and accompanying drawings wherein:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective assembled view of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a sectional view showing the operation of the oil cylinder of the present invention in one state;

FIG. 4 is a sectional view showing the operation of the oil cylinder of the present invention in another state;

FIG. 5 is a side view showing the operation of the present invention; and

FIG. 6 is a side view of a conventional treadmill.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to FIGS. 1 to 5. The adjustable rock arm of the climbing treadmill of the present invention includes a fixed frame body 1 and two upright supports 2 respectively upward extending from two sides of the fixed frame body 1. Two handle bars 3 and an electronic instrument 4 are mounted on the upright supports 2. A swinging unit 5 is disposed on each upright support 2. A supporting frame 11 is mounted on the fixed frame body 1 and a swinging frame 12 is connected with the supporting frame 11. An electric circulating belt assembly 13 is mounted on the swinging frame 12. An electric telescopic actuator 14 is disposed under the swinging frame 12 for adjusting the elevation and slope of the swinging frame 12 in accordance with different trainings.

Each swinging unit 5 includes a rock arm 51 and an oil cylinder 52. A rear end of the rock arm 51 via a shaft 53 is pivotally connected with a lateral side of the upright support 2. The oil cylinder 52 is an exercise-used one and disposed under the rock arm 51. By means of a fixing bracket 54, the upper end of the oil cylinder 52 is connected with the rock arm 51. The lower end of the oil cylinder 52 via a fixing member 55 is fixed on the upright support 2. Referring to FIG. 3, a piston rod 521 and a piston 522 are disposed in the oil cylinder 52. When restoring spring 521 is pulled and extended, the piston 522 is driven to move upward. At this time, a part of the oil will flow out of the inner oil tube 525 and a part of the oil will flow through the oil hole 526 of the piston 522 and the hole 527 of the bottom of the inner oil tube 525 out of the inner oil tube 525. Accordingly, the oil can be released in two directions so as to save the strength of an operator.

Referring to FIG. 4, after restoring spring 521 is released from the pulling force, restoring spring 521 is retracted. At this time, the restoring spring 53 exerts a reverse force onto restoring spring 521 so that restoring spring 521 tends to restore to its initial position. The pressure in the inner oil tube 525 is reduced so that a part of the oil outside the inner oil tube 525 is sucked back through the oil outlet 528, while a part of the oil will flow through the oil hole 526 of the piston 522 back into the inner oil tube 525. Accordingly, restoring spring 521 can automatically retrieve to its initial position without manually pressing back restoring spring 521. The operator can temporarily rest at this buffering moment so as to avoid injury during exercise. By means of a regulating tuner 54 of the oil cylinder 52, the amount of the oil can be controlled to set different amount of tension and pulling force for exercising the operator's arms.

The operator can stand on the electric circulating belt assembly 13 with both hands holding the rock arms 51. The operator can tread the circulating belt assembly 13 and cooperatively swing the rock arms 51 with both hands. By means of the oil cylinders 52, the rock arms 51 can automatically restore. In addition, the tension and pulling force can be adjusted for training the operator's arms. The elevation of the circulating belt assembly 13 can be adjusted to form different slopes for different trainings.

The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. Many modifications of the above embodiments can be made without departing from the spirit of the present invention.