Abstract: A gradient adjusting structure of a treadmill includes two symmetrical adjusting members and a telescopic rod. The center of the adjusting member is pivotally connected with inner face of the column near bottom end thereof. The first ends of the adjusting members are respectively pivotally connected with two sides of front end of the tread platform. A transverse beam is fixed between the second ends of the adjusting members and positioned under the bottom of front end of the tread platform, whereby the stop block of the tread platform can abut against the transverse beam. One end of the telescopic rod is pivotally connected with one side of the transverse beam, while the other end of the telescopic rod is pivotally connected with the bottom of the tread platform.

Abstract: A stepper includes a base and two stands upwardly extending from a front portion of the base. Two swing arms are respectively pivotally connected to a rear portion of the base due to a pivot structure that is mounted in a corresponding one of the two swing arms. Each swing arm has an endless strap sleeved thereon for user to step thereon. A drive shaft pivotally extends through the pivot structures for driving the straps and supporting the two swing arms. A motor is mounted on the base for driving the drive shaft. A restitution structure is mounted under a corresponding one of the two swing arms for providing a restitution force to the corresponding swing arm after being downward stepped.

Abstract: An auxiliary folding device for a treadmill is mounted between a main frame and the platform of the treadmill. The platform is pivotally connected to the main frame. The auxiliary folding device includes an air cylinder having opposite ends respectively pivotally connected to the main frame and the platform. The air cylinder extends when the user folds the platform toward the main frame for user to fold the treadmill in a labor-saving way.

Abstract: A speed control device for a treadmill includes at least one contact switch mounted on a corresponding one of the arms of the treadmill and causing an analogy signal when a user touches the at least one contact switch. A control circuit assembly is mounted in the treadmill and electrically connected to the at least one contact switch for receiving the analogy signal transmitted from the at least one contact switch. The control circuit assembly includes a signal transform circuit receiving the analogy signal and transforming the analogy signal into a digital signal. A waveform process circuit receives the digital signal and transforms the digital signal into a 1/0 or 0/1 signal. A signal output circuit receives the 1/0 or 0/1 signal, amplifies and transmits the signal to a central process unit of the treadmill for controlling a speed of the treadmill.

Abstract: A speed control device of a treadmill includes a transmitter, a receiver, a transmitter end circuit and a receiver end circuit. The transmitter serves to generate and transmit ultrasonic wave, while the receiver serves to receive reflected ultrasonic wave. The transmitter end circuit has an oscillating IC circuit and an analog-digital converting circuit. The oscillating IC circuit serves to oscillate the ultrasonic wave generated by the transmitter to high frequency. The analog-digital converting circuit serves to convert digital signal into analog signal. The receiver end circuit has an amplifying circuit and an analog-digital converting circuit. The amplifying circuit serves to amplify the reflected ultrasonic wave received by the receiver into high frequency. The analog-digital converting circuit serves to convert the reflected analog signal into digital signal.

Abstract: An ascending/descending and folding structure for running exerciser. The running board frame is connected with a linking mechanism and driven thereby. A telescopic tube assembly of a supporting device is telescoped so as to move the caster support back and forth for adjusting the inclination of the running board. By means of rotating a threaded rod, a long sleeve of the linking mechanism is telescoped into a short sleeve, whereby the running board frame is turned upward. Therefore, the running board can be electrically folded. In the case that there is no power supply, a user can directly manually turn the running board upward and fold the running board.

Abstract: A running exerciser structure, a front end of the running board frame is pivotally connected with a second board of a linking mechanism. When a driving motor of the linking mechanism drive a threaded rod to forward or backward rotate, a first and a second threaded bushes are moved along the threaded rod opposite to each other. At the same time, a first and a third links and a third and a fourth links are driven to move opposite to each other. The second board can be continuously ascended or descended and the running board frame is upward or downward inclined to form an upward slope, a downward slope or a plane face. Therefore, a user can upgrade or downgrade or horizontally run on the running board to exercise his/her body to different extents.

Abstract: A Running exerciser structure including a base seat, a frame body and two rocking arms. Two support stems respectively upward extend from two sides of the base seat. Two vertical slide rails are respectively disposed on the support stems. Two sides of the frame body are respectively disposed with two rollers which can vertically roll along the slide rails. Two rocking arms are respectively pivotally disposed on two sides of the frame body and interconnected by a shaft. Two ends of the shaft are respectively disposed with two rollers. A telescopic rod is pivotally disposed between the frame body and the shaft. When a second motor drives the telescopic rod to extend, the rocking arms are driven to swing to elevate or lower the frame body. When the frame body is lifted, the rocking arms, telescopic rod and the frame body form a firm triangular supporting structure for stably supporting the running exerciser.

Abstract: A strength-saving structure for a foldable treadmill exerciser including a support stand, a movable frame body and two torque springs. The inner sides of the support bars of the support stand are disposed with oppositely extending circular tubes near the bottoms thereof. An arch board is disposed in each circular tube. The circular tube and the arch board define therebetween an arch rail. An arch projecting board of the frame body is slidably fitted in the arch rail. The two torque springs are respectively fitted around the circular tubes of the support bars. A hook section of each torque spring hooks an engaging pin under the circular tube, while a backing section of the torque spring backs the bottom of the long bar of the frame body. The torque springs are prestressed. Accordingly, before the frame body is downwardly unfolded, the frame body is backed by the prestressed torque springs and a part of the gravity making the frame body fall down is offset.

Abstract: An exerciser structure includes a fixed unit and a movable unit. The movable unit includes a pair of ring sections. One of the ring sections is fixed with a torque generating portion. The fixed unit is disposed with a fixing board on which an inner guide wheel and several outer guide wheels are rotatably disposed. The inner and outer guide wheels tightly contact with the ring section, so that the ring section can be stably rotated. The exerciser structure can be easily folded with strength saved. In addition, the stress exerted onto the pivot section of the exerciser structure is evenly distributed. The exerciser structure can be alternatively folded by an electric folding measure as necessary.

Abstract: Folding structure of an exerciser including a frame body and a support stand. The support stand has two support legs on two sides of the frame body. The inner sides of the support legs are respectively disposed with a large arch plate and a small arch plate positioned under the large arch plate. The large and small arch plates define an arch rail therebetween. An arch projecting block is disposed on each long side of the frame body for slidably fitting in the arch rail. When folding or unfolding the exerciser, a pressure is exerted onto the frame body. At this time, one side of the arch projecting block is pressed against one end of the top face of the small arch plate to form a supporting point, while the other side of the arch projecting block abuts against one end of the bottom face of the large arch plate to form another supporting point.