Invention Grant
US5020398A Hollow ended four-way socket wrench 失效
中空四通套筒扳手

Hollow ended four-way socket wrench
Abstract:
An improved four-way socket wrench includes elongated socket members having a lower tubular portion connected between a socket head portion and a cross bar member, the lower tubular portion having an axial bore therein that is in communication with the socket opening of the socket member. Rigid implements can be inserted into the socket member so as to impart increased leverage thereto so as to, in turn, impart increased rotational torques to a nut being tightened or loosened.
Public/Granted literature
Information query
Patent Agency Ranking
0/0