Yieldable prop for roof and ground control
OwnerBen L. Seegmillerinventor
Life of this patent
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Abstract
The present invention is directed to a yieldable prop to resist a sagging roof or thrusting floor. The invention is directed to a support apparatus disposed between the floor and the roof. The apparatus comprises a load-bearing member having a length with an axis along the length and having repeating surface undulations along at least a portion of its length. The load-bearing member is capable of moving in the direction of its axis. The apparatus also comprises a resistance member positioned adjacent a portion of length of the load-bearing member. The resistance member resists movement of the load-bearing member by incrementally deforming the undulations on the surface of the load-bearing member adjacent the resistance member as the load-bearing member moves axially.
Claims9
A support apparatus disposed between two surfaces, a floor and a roof, the apparatus comprising:
- a load-bearing member, the load-bearing member adjacent one surface and having a length with an axis along the length and having cross-sectional areas substantially normal to the axis of the length, the load-bearing member capable of moving substantially axially;
- and
- a stationary resistance member and a support member therefor, the support member adjacent another surface, the resistance member positioned adjacent a portion of length of the load-bearing member, the resistance member providing a load resistance by incrementally reducing cross-sectional areas of the load-bearing member adjacent the resistance member as the load-bearing member moves axially.
A support apparatus disposed between two surfaces, a floor and a roof, the apparatus comprising:
- a load-bearing member, the load-bearing member adjacent one surface and having a length with an axis along the length and having threads along at least a portion of the length, the load-bearing member capable of moving substantially axially;
- and
- a stationary resistance member and a support member therefor, the support member adjacent another surface and the resistance member positioned adjacent a portion of the length of the load-bearing member having threads, the resistance member providing a load resistance by incrementally deforming the threads of the load-bearing member adjacent the resistance member as the load-bearing member moves axially.
A support apparatus disposed between two surfaces, a floor and a roof, the apparatus comprising:
- a load-bearing member, the load-bearing member adjacent one surface and having a length with an axis along the length and having repeating surface undulations along at least a portion of the length, the load-bearing member capable of moving substantially axially;
- and
- a stationary resistance member and a support member therefor, the support member adjacent another surface and the resistance member positioned adjacent a portion of the length of the load-bearing member having undulations, the resistance member providing a load resistance by incrementally deforming the undulations of the load-bearing member adjacent the resistance member as the load-bearing member moves axially.
Dependencies are inferred from the claim text.