Patent ID: 7934617
Filing Date: 2011-05-03
Classification: B01D

Abstract:
1. A container having a detachable lid, comprising: a cup-shaped cylindrical casing having a closed upper end, an open lower end and a radial outer flange extending from the open lower end thereof, wherein the casing is made of stamp formed steel plate and the open end thereof comprises a double walled portion formed by folding back the steel plate of the open end back onto an outer surface of a main part of the casing, the radial outer flange being formed as an extension of the folded back steel plate; a disk-shaped lid closing the open end of the casing and provided with a plurality of engagement portions provided on an outer periphery of the lid at a prescribed angular interval; and an annular lock ring having a flange pressuring portion that engages an end surface of the radial outer flange to pressurize the radial outer flange against a peripheral part of the lid and a plurality of engagement portions formed at positions of the lock ring corresponding to the engagement portions of the lid; wherein each engagement portion of the lock ring engages a corresponding one of the engagement portions of the lid, and one of the mutually engaging engagement portions of the lock ring and lid is provided with a guide slot while the other of the mutually engaging engagement portions of the lock ring and lid is provided with an engagement projection received in the guide slot, the guide slot being provided with a first section extending substantially in parallel with an axial line of the casing and a second section extending substantially laterally from the first section; wherein the engagement portions of the lock ring are arranged at a regular angular interval, and the engagement portions of the lid are arranged at a same angular interval; wherein the lock ring comprises an annular peripheral wall extending downward from an outer edge of the flange pressuring portion of the lock ring and having an inner diameter greater than outer diameters of the radial outer flange and lid, and the engagement portions of the lock ring comprises engagement projections projecting radially inwardly from an inner circumferential surface of the peripheral wall; the radial outer flange being provided with notches that permit passage of the engagement projections of the lock ring in an axial direction; and the engagement portions of the lid comprising the guide slots, the first and second sections of each guide slot being defined by a notch and a rim formed in a periphery of the lid, respectively.