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| Printed circuit board fabrication |
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Leg stretching device
| Details |
Inventors: Hsu, Frank;
Assignee:
Primary Examiner: Crow; Stephen R.
Assistant Examiner:
Attorney, Agent or Firm: Akin, Gump, Strauss, Hauer & Feld, L.L.P.
A leg stretching device includes a base unit, a connecting frame, a control mechanism, and a pair of leg support rods. The control mechanism includes a slide rod having a frame connecting portion mounted non-rotatably on the connecting frame, and a rack portion extending slidably into a stationary tube of the base unit. A ratchet wheel is mounted rotatably on the stationary tube and meshes with the rack portion. A control lever is mounted pivotally on the stationary tube, and a pawl unit is mounted on the control lever. The pawl unit engages the ratchet wheel to transmit a forward turning force applied on the control lever to the ratchet wheel, thereby enabling the ratchet wheel to rotate in a direction for retracting the slide rod into the stationary tube, and disengages the ratchet wheel when a rearward turning force is applied on the control lever. Each of the leg support rods is mounted pivotally on the connecting frame at one end, and is provided with an ankle support at the other end. |
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DETAILED DESCRIPTION Therefore, the main object of the present invention is to provide a leg stretching device that is capable of overcoming the aforesaid drawbacks that are commonly associated with the prior art.
According to the present invention, a leg stretching device comprises a base unit, a connecting frame, a control mechanism, and a pair of leg support rods.
The base unit includes a stationary tube with front and rear end portions spaced apart from each other in a longitudinal direction, and at least one seat member mounted on the rear end portion of the stationary tube.
The control mechanism includes a slide rod, a ratchet wheel, a control lever, and a pawl unit.
The slide rod has a frame connecting portion mounted non-rotatably on the connecting frame, and a rack portion opposite to the frame connecting portion and extending slidably into the front end portion of the stationary tube.
The ratchet wheel is mounted rotatably on the front end portion of the stationary tube about a pivot axis transverse to the longitudinal direction, and meshes with the rack portion of the slide rod.
The control lever is mounted pivotally on the front end portion of the stationary tube.
The pawl unit is mounted on the control lever, engages the ratchet wheel to transmit a forward turning force applied on the control lever to the ratchet wheel, thereby enabling the ratchet wheel to rotate in a direction for retracting the slide rod into the stationary tube, and disengages the ratchet wheel when a rearward turning force is applied on the control lever.
The leg support rods are disposed respectively on opposite lateral sides of the slide rod.
Each of the leg support rods includes a pivot rod body that has one end mounted pivotally on the connecting frame, and an ankle support that is mounted on the other end of the pivot rod body.
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