| 主权项 |
1. A collapsible mechanism for a treadmill, comprising:
a support frame; a stand pivotably attached to the support frame and having a frame body, a first positioning assembly, and a second positioning assembly, the frame body having a bottom side pivotably attached to the support frame, whereby the frame body is collapsible relative to the support frame, the first and second positioning assembly being connected with the frame body and the support frame respectively and located at the bottom side of the support frame, the first positioning assembly having a first fastener and a first sheet member, the second positioning assembly having a second fastener and a second sheet member, the first and second fasteners being mounted onto the support frame, each of the first and second sheet members having an arc-shaped guide slot having two first specific positions, each of arc-shaped climaxes of the arc-shaped guide slots being close to a front side of the first (second) sheet member, each of the two arc-shaped guide slots having two distal ends close to a top side and a bottom side of the first (second) sheet member, respective rear sides of the first and second sheet members being connected with the frame body, the first and second fasteners passing through the arc-shaped guide slots of the first and second sheet members respectively, the first fastener having a first operational knob, the second fastener having a second operational knob, each of the first and second knobs having a head portion and a neck portion, each of the head portions being located at a side of the first (second) sheet member; when each of the neck portions of the first and second fasteners is located at one of the two first specific positions of the arc-shaped guide slot, the stand is set erect relative to the support frame; when each of the neck portions is located at the other first specific position, the stand is set collapsed relative to the support frame; when the neck portions of the first and second operational knobs exit the two first specific positions respectively, the frame body can move along the two arc-shaped guide slots wherein the first positioning assembly further comprises a first sleeve and a first spring; the first fastener further comprises a first link located inside the arc-shaped guide slot of the first sheet member, the first link having an end threadably secured with and located inside the first sleeve, the first spring being sleeved onto the first link and located inside the first sleeve, the first operational knob being mounted onto the first link and located at the other end of the first link to be movable relative to the first link; the second positioning assembly further comprises a second sleeve and a second spring; the second fastener further comprises a second link located inside the arc-shaped guide slot of the second sheet member, the second link having an end threadably secured with the second sleeve and located inside the second sleeve, the other end of the second link being inserted through the head and neck portions of the second operational knob, the head portion of the second operational knob having a chamber for receiving the second spring, the second operational knob being movable relative to the second link; and an operational console pivotably attached to a top side of the frame body and collapsible relative to the stand. |
