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1. (WO1979000991) AUTOMATIC GRAPPLE CONTROL SYSTEM
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000991 International Application No.: PCT/US1978/000220
Publication Date: 29.11.1979 International Filing Date: 11.12.1978
IPC:
B66C 1/58 (2006.01) ,B66C 3/16 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
66
HOISTING; LIFTING; HAULING
C
CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
1
Load-engaging elements or devices attached to lifting, lowering, or hauling gear of cranes, or adapted for connection therewith for transmitting forces to articles or groups of articles
10
by mechanical means
42
Gripping members engaging only the external or internal surface of the articles
58
and deforming the articles, e.g. by using gripping members such as tongs or grapples
B PERFORMING OPERATIONS; TRANSPORTING
66
HOISTING; LIFTING; HAULING
C
CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
3
Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
14
Grabs opened or closed by driving motors thereon
16
by fluid motors
Applicants:
Inventors:
Priority Data:
90063227.04.1978US
Title (EN) AUTOMATIC GRAPPLE CONTROL SYSTEM
(FR) SYSTEME DE COMMANDE AUTOMATIQUE D"UNE BENNE PRENEUSE
Abstract:
(EN) Maintenance of pressure in the hydraulic circuit controlling the closing of the tongs of a grapple in order to prevent a load carried by the tongs from falling or slipping. The grapple tong (12, 14) system has first (28) and second (30) hydraulic lines for closing and raising the grapple (13) tongs, respectively. A hydraulic (32) system is provided for automatically, controllably passing fluid from the second to the first line in response to a preselected pressure in the first (28) line and a higher pressure in the second (30) line for automatically, controllably urging the grapples (13) to a closed position.
(FR) On maintient la pression dans le circuit hydraulique commandant la fermeture des griffes d"une benne preneuse de maniere a empecher une charge portee par les griffes de tomber ou glisser. Le systeme de benne preneuse a griffes (12, 14) possede un premier (28) et un second (30) circuit hydraulique pour fermer et lever la benne preneuse a griffes (13) respectivement. Un systeme hydraulique (32) assure automatiquement le passage commande d"un fluide du second circuit au premier circuit en reponse a une pression predeterminee dans le premier circuit (28) et une pression superieure dans le second circuit (30) pour forcer automatiquement les griffes (13) a prendre une position fermee.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)