Force sensing device
AssigneeDr. -Ing. Ludwig Pietzsch
InventorsLudwig Pietzsch, Knud Overlach
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Abstract
The invention relates to a force sensing device which is to be inserted in a force transmitting structural member, like a rope, especially a rope for lifting a jib or a load of a crane. The force sensing device has a flat body provided with weak locations at which strain measuring devices are fixed. The flat body is dimensioned with respect to a high degree of safety against overload, to high duration working stability and reproducibility as well as to a simple and cheap production.
Claims11
A force sensing device, which is to be inserted in a force transmitting structural member like a rope and is itself designed as a force transmitting member, the device comprising a flat body having between two connection openings at opposed ends of the body a central through hole of greater diameter than the connection openings, said through hole being closed at both ends and having fixed on its inner wall at least one strain measuring element, wherein
- the flat body has a constant small thickness over its total length and a constant width at least in the body portion extending along the distance of the centers of the connection openings,
- the diameter of the central through hole and thickness and width of the flat body are dimensioned such that the stress produced by nominal load at the weakest section of the body between the control hole and the longitudinal rim is lower than the proportional limit and amounts at most to 1/3 of the yield stress of the body material, and
- spherical bearings are inserted in the connection openings, said bearings accomodating usual connection elements like shackles or the like for connecting the sensing device to the structural member.
Dependencies are inferred from the claim text.