Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Reexamination Certificate
1998-12-03
2001-04-03
Noori, Max (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
C073S862420
Reexamination Certificate
active
06209401
ABSTRACT:
FIELD OF THE INVENTION
The following invention describes a device to measure tension force in pretensioned web and pretensioned wire without having any remaining affect on the measured object.
The device that is primarily expected to be used in the transport sector is a portable easy handled control instrument for authorities, transporters and senders.
BACKGROUND OF THE INVENTION
The background of the invention is the need in the transport sector for the possibility to easily and quickly check tension force in lashing bands to secure desired pretension forces in order to increase traffic safety and decrease transport damages.
DESCRIPTION OF THE PRIOR ART
The ability to control the so called pretension force in webs and wires is of primary importance in transport to achieve safe securing of cargo to carrier. This control should also be possible to be carried out in such a way that it doesn't permanently affect the lashing.
Today there are no such equipment that meets the above demand.
Measuring tension force in wire or similar objects by bending it over three points and measuring the force across the object for actual bending (approx. a linear function of the tension force), recalculating it to tension force (alt. calibrate it against actual force) and presenting it as the wanted force is a well known technique. This was described already in 1929 in the patent U.S. Pat. No. 1,722,036 and later in among others U.S. Pat. No. 1,871,776, UYS 3,653,258, U.S. Pat. No. 3,698,244 and U.S. Pat. No. 4,860,597 and now latest in U.S. Pat. No. 4,860,597 and FR 2 711 425.
The known technique, that mostly has been used for wires, has had its main use for lifting devices (cranes, traverses, etc.) where it has been used as a so called overload protection.
Because of that, the existing equipment is designed for wire and mainly planned to be used in fixed installations.
The known technique is not used in the transport sector, as well as on the type of lashing bands that are so common. For that reason no portable easy handled instrument has been developed for measuring tension force in webs and wires.
SUMMARY OF THE INVENTION
The purpose of the invention is to supply a device that makes it easy to check the force momentarily in a lashing from the time it is tightened until it is untightened.
Consequently, the tension force meter weights only approx. 3 kg and has the dimension approx. 20×10×30 cm. To achieve bending of the measured object the device utilizes rolls and axles. Beside that there is a measure unit (mechanical or electronic) that registrates the needed force to produce actual bending and by recalculation/calibration displays the searched tension force.
A significant advantage with a device according to the invention is that it easily can be moved across the object, perform the measuring and as easily be removed without having any remaining affect on the lashing. This calls for geometries to be chosen so that the measured object is permanently in its elastic state.
REFERENCES:
patent: 2307090 (1943-01-01), Pilliod et al.
patent: 2592868 (1952-04-01), Cushman
patent: 3359790 (1967-12-01), Dillon
patent: 3868662 (1975-02-01), Russell, Jr.
patent: 3879999 (1975-04-01), Saxl
patent: 4118978 (1978-10-01), Lowenheck
John Lezdey & Assoc
Noori Max
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