LEAD CARTRIDGE AND MECHANICAL PENCIL WITH BUILT-IN LEAD CARTRIDGE

摘要

A lead cartridge has a tank part for storing leads and is detachably connected to a receiving part provided at the lead send-out mechanism of a mechanical pencil so as to supply a lead. It is possible to reduce costs for manufacturing the lead cartridge and the number of manufacturing steps and prevent the falling out of the lead from the lead cartridge. The lead cartridge (10) has a case (12) and a swing cover (14). The case (12) has a tank part (12a) demarcated therein and the tip of the case (12) is made to be an open tip connection part (12b). Between the tank part (12a) and the tip connection part (12b), a lead port (12e) is formed. The swing cover (14) is mounted swingably to a closing position for closing the lead port (12e) and an opening position for opening the lead port (12e) in the case (12). The swing cover (14) has a part to be interfered (14c) which can be interfered with an interference part (46e) of a cartridge receiving part (46b) of the mechanical pencil. The swinging cover (14) is urged in a swinging direction from the opening position to the closing position. However, when the open tip connection part (12b) is engaged with the cartridge receiving part (46b), the part to be interfered (14c) is interfered with the interference part (46e) and to swing from the closing position to the opening position.