| 摘要 |
This invention relates to the hoist means employing the principle of the scissor action between a pair of the structural frames pivotably coupled to one another. The scissor hoist of the present invention employs either a combination of a pair of the structural frames of two different lengths wherein one extremity of the first structural frame with the other extremity resting on the floor or the ground is pivotably connected to the second structural frame intermediate one extremity raised to midair and the other extremity resting on the floor or the ground, which combination includes the mechanical or hydraulic means for creating the scissor movement between said two structural frames and the means for securing the hoist cable or chain to said one extremity of said second structural frame, or another combination including another pair of the structural frames pivotably connected to one another by the hinge joint disposed intermediate the one extremities raised to mid-air and the other extremities resting on the floor or the ground of said two structural frames, which combination includes the mechanical or hydraulic means for creating the scissor movement between said two structural frames and the means for securing the hoist cable or chain to a horizontal structural member secured to said pair of the structural frames at said hinge joint; whereby the raising and lowering movement of said horizontal structural member resulting from the scissor movement between said two structural frames raises and lowers the objects.
|
