LEAD CARTRIDGE AND MECHANICAL PENCIL WITH BUILT-IN LEAD CARTRIDGE

摘要

A lead cartridge that is provided with a tank part for storing leads and is capable of being detachably connected to a receiving part provided in a lead feeding mechanism of a mechanical pencil to supply a lead can reduce costs for manufacturing the lead cartridge and the number of manufacturing steps and can prevent a lead from falling out from the lead cartridge inadvertently. The lead cartridge 10 includes a case 12 and a swing cover 14. A tank part 12a is defined inside the case 12 and the tip end part of the case 12 is formed with an open tip end connection part 12b. Between the tank part 12a and the tip end connection part 12b, a lead port 12e is formed. The swing cover 14 is mounted in the case 12 swingably to a closing position where the swing cover 14 closes the lead port 12e and to an opening position where the swing cover 14 opens the lead port 12e. The swing cover 14 includes an interfered part 14c capable of being interfered with an interference part 46e of a cartridge receiving part 46b of the mechanical pencil. The swing cover 14 is biased in a swing direction from the opening position to the closing position but swings from the closing position to the opening position when the tip end connection part 12b is fitted with the cartridge receiving part 46b so as to cause the interfered part 14c to be interfered with the interference part 46e.