Tightening indicator fastening

The rivet, screw, or bolt comprises a rod-shaped body (10) having a head (14) and/or thread (12) on the outer periphery. A longitudinal hole (18) is open at one end. A rod (20) is disposed in the hole and fixed at its inner end (22) to the inner end (24) of the hole. A light transmissive window (34)...

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Bibliographic Details
Main Authors HIROSATO TAKEUCHI, OSAHIKO MIYAZAKI, NAOYA KURIHARA, YASUO KAZAMA
Format Patent
LanguageEnglish
Italian
Published 05.09.1990
Edition5
Subjects
BASIC ELECTRIC ELEMENTS
BLASTING
CURRENT COLLECTORS
DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS ORMACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS,CLIPS, WEDGES, JOINTS OR JOINTING
ELECTRICITY
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
LIGHTING
LINE CONNECTORS
MEASURING
MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE
MECHANICAL ENGINEERING
PHYSICS
TESTING
THERMAL INSULATION IN GENERAL
WEAPONS
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Summary:The rivet, screw, or bolt comprises a rod-shaped body (10) having a head (14) and/or thread (12) on the outer periphery. A longitudinal hole (18) is open at one end. A rod (20) is disposed in the hole and fixed at its inner end (22) to the inner end (24) of the hole. A light transmissive window (34) is fixed in the opening (30) of the hole. A flexible, light transmissive, fluid holder (38) holds a coloured fluid (40) and pressed by the free end of the rod against the window. When a longitudinal strain is developed in the body the rod releases the holder sufficiently for the coloured fluid to obscure the coloured indicator (36) on the free end of the rod. The position of the rod in the hole is adjustable to set the limit value of the stress to which the fastener should be subjected.
Bibliography:Application Number: IT19870021630