Patent ID: 7589494
Filing Date: 2009-09-15
Classification: H01M,H02J,Y02E

Abstract:
1. A slim battery charger, comprising: a) a main charging body having a swivelable plug at a bottom thereof for connecting to a mains socket to obtain alternating current (AC) from the mains socket; b) two charging grooves adapted to accommodate batteries, the charging grooves being disposed at left and right sides of the main charging body; and c) a charging control circuit board installed in a cavity in a central portion of the main charging body, two conducting spring strips being coupled to a front end thereof for electrically connecting to the plug, two first terminals being electrically coupled to a rear end of the charging control circuit board, contact surfaces of the first terminals respectively extend into recesses at a rear end of the left and the right charging groove for receiving a positive contact of batteries to be charged, a second terminal being disposed at an opposite end of each respective charging groove opposite to a corresponding one of the first terminals, the second terminal being electrically coupled to the charging control circuit board, each second terminal including an external sleeve engaged into a corresponding locking groove disposed at the opposite end of the respective charging groove, the external sleeve having a closed proximal end, an open distal end and a through bore extending therebetween, each second terminal further including an internal sleeve telescopically engaged within the through bore of the external sleeve and biased by a spring to extend outwardly from the distal end of the external sleeve to be reversibly extendable and retractable for abutting a negative contact of a corresponding battery to be charged such that the charging grooves each accommodate a 3/AA or a 4/AAA secondary battery for the charging process wherein the external sleeve of the second terminal includes, a locking portion extending inwardly adjacent the open distal end thereof; internal sleeve being formed as a hollow body having an opening at the front end thereof, the internal sleeve having a flange extending outwardly and corresponding to the locking portion, the rear end of the internal sleeve being extended to the front end of the charging groves, the internal sleeve having; the spring installed therein and extending to a cap forming a closure of the proximal end of the external sleeve.