Automatic screwing and unscrewing of stud-bolts of large dimensions - by device incorporating second means of rotating bolting head when unscrewing effort exceeds predetermined value

• Main Author: PIERRE ANTOINE THEOPHILE GIBERT
• Format: Patent
• Language: English; French
• Published: 22.05.1981
• Subjects: COMBINED OPERATIONS; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; OTHER WORKING OF METAL; PERFORMING OPERATIONS; TRANSPORTING; UNIVERSAL MACHINE TOOLS

A device for the automatic screwing and unscrewing of stud- bolts of large dimensions comprises a first means of rotation of the bolting head in one or the other sense of rotation and a second independent means capable of being substituted for the first means when the unscrewing effort of the bolting head exceeds a predetermined value. The invention improves the means of screwing and unscrewing stud bolts of large dimensions described in the parent patent in that it resolves simply and efficiently the problem of overcoming the resistance when a difficult point is encountered e.g. when unscrewing necessitates the development of a couple near to or greater than the max. couple which the jack-free wheel system can develop. L'INVENTION CONCERNE LES AUTOMATES DE GOUJONNAGE OU DE DEGOUJONNAGE.ELLE EST CARACTERISEE EN CE QUE L'AUTOMATE COMPREND DES PREMIERS MOYENS DE ROTATION DE LA TETE DE GOUJONNAGE DANS L'UN OU L'AUTRE SENS DE ROTATION ET DES SECONDS MOYENS INDEPENDANTS SUSCEPTIBLES D'ETRE SUBSTITUES AUXDITS PREMIERS MOYENS LORSQUE L'EFFORT DEDEVISSAGE DE LADITE TETE DE GOUJONNAGE DEPASSE UNE VALEUR PREDETERMINEE.APPLICATION, NOTAMMENT AU DEVISSAGE DES GOUJONS DE FORTES DIMENSIONS ET POUR LESQUELS IL FAUT DEVELOPPER DES COUPLES IMPORTANTS.