Automatically retracting chalk line marking tool

摘要: A pistol-shaped automatically retracting chalk-line dispenser comprises a three-member housing enclosing two separate chambers. The upper, chalk-receiving chamber, contains double-walled spool and line-guiding roller. seal on the shaft prevents chalk dust from entering second which drive gears, line-retracting spring, trigger-actuated latching brake mechanism. In one embodiment, finger-like projection trigger is initially brought to bear rotating cap rate of line retraction as pulled rearwardly. If back more than predetermined distance, snaps into engagement between teeth sprocket attached thus locks