Method and Device for Detecting Crack Formation in a Hoisting Member
First Claim
1. A method for detecting crack formation in a hoisting member, comprising the steps of:
- measuring a stress under load at least at two points of the hoisting member,comparing the measured stresses, andgenerating a warning signal when the measured stresses differ too much from each other.
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Accused Products
Abstract
The invention relates to a method for detecting crack formation in a hoisting member, comprising the steps of measuring a stress under load at two points of the hoisting member, comparing the measured stresses and generating a warning signal when the measured stresses differ too much from each other.
The invention also relates to a device for detecting crack formation in a hoisting member, comprising means arranged at two points of the hoisting member for measuring a stress under load, means connected to the measuring means for comparing the measured stresses, and means connected to the comparing means for generating a warning signal when the measured stresses differ too much from each other.
Finally, the invention relates to a hoisting frame, comprising a number of hoisting members which are mounted thereon close to its corners, and crack detection devices connected thereto.
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Citations
23 Claims
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1. A method for detecting crack formation in a hoisting member, comprising the steps of:
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measuring a stress under load at least at two points of the hoisting member, comparing the measured stresses, and generating a warning signal when the measured stresses differ too much from each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A crack detection device for detecting crack formation in a hoisting member, comprising:
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measuring means arranged at least at two points of the hoisting member for measuring a stress under load, comparing means connected to the measuring means for comparing the measured stresses, and warning signal-generating means connected to the comparing means for generating a warning signal when the measured stresses differ too much from each other. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A hoisting frame assembly, comprising:
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a hoisting frame having corners, a plurality of hoisting members which are mounted on the hoisting frame close to the corners of the hoisting frame, and crack detection devices connected to the hoisting members for detecting crack formation in the hoisting members, each crack detection device comprising; measuring means arranged at least at two points of one of the hoisting members for measuring a stress under load at each of the two points, comparing means connected to the measuring means for comparing the measured stresses, and means connected to the comparing means for generating a warning signal when the measured stresses differ too much from each other.
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Specification