Electric treadmill

Abstract

An electric treadmill includes a base, vertical posts coupled to the base, a desk with a treading belt, and a lifting and folding device. The lifting and folding device includes a linear actuator disposed on the desk and having a retractable lifting pipe, a lifting unit connected to the desk, a pivotal connection point protruding from the desk, first and second lateral panels, and a fixing stand disposed between the second lateral panels and connected to the lifting pipe, two movable pivotal connection elements disposed at free ends of the first lateral panels, respectively, two linking plates connected to the first lateral panels and a link, two position-limiting elements disposed between the base and the lifting unit, connected to two lateral bars of the base by an axle, and having a slot each, and two guide rods coupled to the first lateral panels and inserted into the slots.

1 . An electric treadmill, comprising:
 a base having two lateral bars spaced apart from each other and each having a first end portion and a second end portion which are disposed oppositely, and two positioning units fixedly disposed at the front ends of two lateral bars, respectively, and having an axial hole each;   vertical posts coupled to the base and extending upward;   a desk comprising two lateral panels, at least one fixing rod, and a treading belt, the lateral panels being spaced apart from each other and each having a first section portion and a second section portion which are disposed oppositely, the at least one fixing rod being fixedly coupled between the lateral panels to form a frame, and the treading belt having front and rear ends positioned within the frame and moving along a closed path; and   a lifting and folding device comprising a linear actuator, a lifting unit, two movable pivotal connection elements, two linking plates, a link, two position-limiting elements, and two guide rods, the linear actuator being disposed on the desk and having a lifting pipe capable of extending and retracting lengthwise, the lifting unit having a front end pivotally connected to the desk, a pivotal connection point protruding from the front of the desk, a first lateral panel and a second lateral panel which are spaced apart from each other, and a fixing stand fixedly disposed between the second lateral panels and connected to the lifting pipe of the linear actuator such that the lifting unit is guided by the lifting pipe of the linear actuator to perform gradient-related and elevation angle-related motion, the two movable pivotal connection elements being disposed at free ends at terminal sections of the first lateral panels of the lifting unit, respectively, the two linking plates each having an end connected to a corresponding one of the first lateral panels and positioned proximate to the movable pivotal connection elements, the two linking plates each having another end fixedly connected to the free end of the link, the two position-limiting elements being disposed between an inner side of the base and the lifting unit, the position-limiting elements each having an end pivotally connected to two lateral bars of the base by means of an axle, the position-limiting elements having a slot each, and the two guide rods each having an end fixedly coupled to a point of a corresponding one of the first lateral panels and each having another end inserted into the slot of a corresponding one of the position-limiting elements such that the guide rods slide axially relative to the slots under an applied force.   
     
     
         2 . The electric treadmill of  claim 1 , wherein the slot of each of the position-limiting elements has an upper starting point and a lower starting point, such that each of the guide rods can undergo position-limited motion between the upper starting point and the lower starting point of the slot. 
     
     
         3 . The electric treadmill of  claim 1 , wherein the link provided in form of an elongate rod, having a top surface with two pads thereon. 
     
     
         4 . The electric treadmill of  claim 3 , the link is flanked by and connected to two positioning elements, an end of each of the positioning elements is fixedly connected to the free end of the link, another end of each of the positioning elements is pivotally connected to the axial hole of each of the positioning units.