| 主权项 |
1. A back stretching device, comprising:
a handle unit, which has two parallel handgrip tubes, each of which has opposite front and rear ends; a support unit, which comprises a lower cross bar connecting between the front ends of the two handgrip tubes, the lower cross bar and the handgrip tubes collectively defining a first plane; a hold-down unit, which comprises two parallel guide rods, each of which has opposite upper and lower ends, an upper cross bar connecting between the upper ends of the guide rods, the upper cross bar being substantially parallel to the lower cross bar, the guide rods and the upper cross bar collectively defining a second plane, which intersects the first plane at a predetermined non-zero angle; and an adjustment unit, which couples the two guide rods to the two handgrip tubes in such a way that the upper cross bar is movable on the second plane with respect to the lower cross bar and is spaced from the first plane so as to define a distance-adjustable constraint space between the upper cross bar and the lower cross bar, whereby the constraint space is sufficient to receive the legs of a user to extend therethrough in a closely juxtaposed manner with the lower cross bar configured to support the underside of the legs, with the upper cross bar configured to constrain the upper side of the legs, the two handgrip tubes configured to be held by the hands of the user to support the legs and body of the user for carrying out a back stretching operation; wherein the adjustment unit comprises two sleeves respectively mounted to the front ends of the handgrip tubes, the lower cross bar being arranged to connect between the two sleeves, the two sleeves respectively receiving the two guide rods to slide therein for coupling, the two guide rods each forming a series of adjustment holes extending therethrough at different altitudes, the sleeves each forming a positioning hole corresponding to the adjustment holes, a pin being removably fit into the positioning hole and a respective one of the adjustment holes to secure the guide rod to the respective sleeve; the support unit comprises two parallel connection bars, each of which has opposite front and rear ends, the lower cross bar being connected between the front ends of the two connection bars, the two connection bars being respectively coupled to the front ends of the two handgrip tubes through the adjustment unit; the two connection bars each form a diameter-reduced neck section at the rear end thereof, a first assembling hole being formed diametrically through the neck section, the two sleeves each comprising a joint tube extending from an outer circumference thereof for receiving the respective connection bar to insert therein, the joint tube forming a second assembling hole corresponding to the first assembling hole, whereby a fastener set is receivable through the first and second assembling holes to connect the lower cross bar between the two handgrip tubes. |
