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1. WO1994002749 - DYNAMOMETRIC SCREW OR NUT

Publication Number WO/1994/002749
Publication Date 03.02.1994
International Application No. PCT/SE1992/000519
International Filing Date 15.07.1992
Chapter 2 Demand Filed 10.02.1994
IPC
F16B 31/02 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
31Screwed connections specially modified in view of tensile load; Break-bolts
02for indicating or limiting tensile load
CPC
F16B 31/02
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
31Screwed connections specially modified in view of tensile load; Break-bolts
02for indicating ; the attainment of a particular tensile load; or limiting tensile load
Y10S 411/931
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
411Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
924Coupled nut and bolt
929Thread lock
931Superposed nuts
Applicants
  • EXCELSIOR DEVELOPMENT INC. [US]/[US] (AllExceptUS)
  • WÄTTERBÄCK, Paul, Gunnar [SE]/[SE] (UsOnly)
Inventors
  • WÄTTERBÄCK, Paul, Gunnar
Agents
  • HYNELL, Magnus
Priority Data
Publication Language English (EN)
Filing Language Swedish (SV)
Designated States
Title
(EN) DYNAMOMETRIC SCREW OR NUT
(FR) VIS OU ECROU DYNAMOMETRIQUE
Abstract
(EN)
The invention relates to a torque nut or torque screw, i.e. a fastening device with fastening threads, i.e. threads which are operative for the fastening function of the device, and with an indication means which is integrated in the device to be released at a predetermined tightening torque. The invention comprises an inner fastening member (7) having said fastening threads (8) and outside of the inner fastening member an outer female member (10) rotatable by means of a spanner, a pair of pliers, a screw driver, or other tool, said female member being connected to the inner fastening member by means of a coupling (13) having a sufficient strength to transfer to the inner fastening member a torque of a magnitude for which the fastening device is designed. The outer female member (10) is provided, at the tightening of the coupling, to be released and rotated relative to the inner fastening member (7) but not until the predetermined torque is exceeded. The coupling between the outer female (10) and the inner fastening member (7) consists of a conical screw coupling.
(FR)
L'invention a trait à une vis ou un écrou de couple, c'est-à-dire un dispositif de fixation comportant un filetage, donc permettant cette fonction pour le dispositif qui est doté d'un moyen d'indication intégré devant se libérant à un couple de serrage prédéterminé. L'invention comprend un élément interne (7), qui porte ledit filetage de fixation (8), hors duquel se trouve un élément femelle externe (10) qu'on peut faire tourner grâce à une clé à vis, une paire de pinces, un tournevis ou autre outil, élément femelle connecté à l'élément de fixation interne au moyen d'un couplage (13) suffisamment solide pour transmettre à ce dernier un couple correspondant à la valeur pour laquelle est conçu le dispositif de fixation. L'élément femelle externe (10) est conçu, lorsqu'on serre le couplage, pour se libérer et tourner par rapport à l'élément de fixation interne (7) mais seulement quand on dépasse le couple prédéterminé. Le couplage entre l'élément femelle externe (10) et l'élément de fixation interne (7) est constitué d'une vis conique.
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