Method and apparatus for detecting overload distortion
First Claim
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1. A method for detecting overload distortion in lifting gear comprising:
- (i) providing a hook which is susceptible to overload distortion;
(ii) providing said hook with three reference points at locations thereon defining, in an undistorted state of said hook, an isosceles or equilateral triangle; and
(iii) comparing the dimensions of two sides of said isosceles or equilateral triangle, one of which includes the dimension of said hook which is the more liable to dimensional increase in the case of overload distortion, after subjecting said hook to possible overloading.
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Abstract
A method and apparatus for detecting overload distortion in lifting and the like gear is disclosed. The apparatus includes a hook with two reference points thereon defining, in the undistorted state of the hook, a reference dimension. The hook also has a standard dimension provided on the hook and conveniently accessible for reference purposes. The standard dimension is also a pair of points and one of this pair is coincident with one of the reference points thereby forming a triangle of points on the hook.
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10 Claims
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1. A method for detecting overload distortion in lifting gear comprising:
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(i) providing a hook which is susceptible to overload distortion; (ii) providing said hook with three reference points at locations thereon defining, in an undistorted state of said hook, an isosceles or equilateral triangle; and (iii) comparing the dimensions of two sides of said isosceles or equilateral triangle, one of which includes the dimension of said hook which is the more liable to dimensional increase in the case of overload distortion, after subjecting said hook to possible overloading. - View Dependent Claims (2)
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3. A hook which is susceptible to overload distortion;
- said hook comprising two reference points thereon defining, in the undistorted state of said hook, a reference length in a portion of said hook which is liable to dimensional increase in the case of overload;
said reference length being comparable with known length data after subjecting said hook to possible overloading, in order to determine whether overload distortion has occurred; and
said hook comprising, in addition to said two reference points defining said reference length, at least one further reference point that at least partially defines said known length data, said further reference point being provided on said hook and conveniently accessible for reference purposes. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
- said hook comprising two reference points thereon defining, in the undistorted state of said hook, a reference length in a portion of said hook which is liable to dimensional increase in the case of overload;
Specification