Biaxial-orientation blow-molded bottle-shaped container having opposed recesses and grooves for stable gripping and anti-buckling stiffness

Claim 1

A blow-molded bottle-shaped container of biaxially oriented thermoplastic synthetic resin comprising: a cylindrical container body defining a longitudinal center line and having a shoulder and neck portion at an upper end thereof and a bottom portion at a lower end thereof; a pair of recesses depressed inwardly on opposite sides of a rear half portion of the cylindrical container body substantially at a central height position of the cylindrical container body to form a grip to be grasped by one hand, said recesses including tapered parts disposed oppositely with respect to the longitudinal center line and having inclined surfaces substantially inclined in a direction from the rear half portion of said container body toward a center thereof, said recesses having a nadir area aligned with an area including a point defining the center of gravity of said container; a pair of parallel upper and lower circumferential reinforcing grooves extending around an exterior peripheral surface of said cylindrical container body, said upper circumferential groove being located between said shoulder and neck portion and said recesses, and said lower circumferential groove being located between said bottom portion and said recesses; a notch formed in the bottom portion at the rear half portion of the cylindrical container body and circumferentially extending between the recesses; and a pair of parallel upper and lower circumferential reinforcing rib grooves located entirely in the grip between upper and lower limits of the recesses and extending between the tapered part of one recess and the tapered part of the opposite recess without extending into the recesses.