Lead cartridge and mechanical pencil with built-in lead cartridge

A lead cartridge adapted for storing leads and capable of being detachably connected to a lead feeding mechanism of a mechanical pencil to supply the leads one by one to the lead feeding mechanism, the lead feeding mechanism being provided with a receiving part, the lead cartridge comprising:

• a tank part for storing the leads therein;
• a tip end connection part capable of being detachably fitted with the receiving part of the lead feeding mechanism;
• a lead port provided on a tip end side of the tank part to allow one of the leads in the tank part to pass therethrough from the tank part;
• and
• a swing cover arranged in the lead cartridge so as to be swingable to a closing position where the swing cover closes the lead port and to an opening position where the swing cover opens the lead port at a position posterior to the lead port,
• wherein the swing cover is biased in a swing direction from the opening position to the closing position, adapted to be swung from the closing position to the opening position when the tip end connection part is fitted with the receiving part, and adapted to prevent a lead in the tank part from aligning with the lead port in a condition closing the lead port, so that when the tip end connection part is fitted with the receiving part in a state where the lead feeding mechanism holds a lead, the lead held by the lead feeding mechanism and a lead in the tank part can be prevented from aligning with each other.

A lead cartridge adapted for storing leads and capable of being detachably connected to a lead feeding mechanism of a mechanical pencil to supply the leads one by one to the lead feeding mechanism, the mechanical pencil being provided with an interference part, the lead feeding mechanism being provided with a receiving part, the lead cartridge comprising:

• a tank part for storing the leads therein;
• a tip end connection part capable of being detachably fitted with the receiving part of the lead feeding mechanism;
• a lead port provided on a tip end side of the tank part to allow one of the leads in the tank part to pass therethrough from the tank part;
• and
• a swing cover arranged in the lead cartridge so as to be swingable between a closing position where the swing cover closes the lead port, and an opening position where the swing cover opens the lead port at a position posterior to the lead port, the swing cover including an interfered part capable of being interfered with the interference part of the mechanical pencil,
• wherein the swing cover is biased in a swing direction from the opening position to the closing position,
• wherein the swing cover is adapted to be swung from the closing position to the opening position when the tip end connection part is fitted with the receiving part so as to cause the interfered part to be interfered with the interference part,
• wherein the swing cover is adapted to prevent a lead in the tank part from aligning with the lead port in a condition closing the lead port, such that when the tip end connection part is fitted with the receiving part in a state where the lead feeding mechanism holds a lead, the lead held by the lead feeding mechanism and a lead in the tank part can be prevented from aligning with each other, and
• wherein, when the tip end connection part is fitted with the receiving part in the state where the lead feeding mechanism holds the lead, the swing cover is adapted to be swingable from the closing position to the opening position by the lead held by the lead feeding mechanism, in addition to the swinging movement taking place by the fitting of the tip end connection part with the receiving part.