Patent ID: 6379068
Filing Date: 2002-04-30
Classification: B43K

Abstract:
A compact pen comprising:a bottom barrel having a top opening, an aperture oppositely defined with respect to the top opening, and a threaded surface formed in an inner surface of the bottom barrel near the top opening; a controlling device having a threaded portion, and the threaded portion threadingly engaged with the threaded surface of the bottom barrel; an ink container movably received in the bottom barrel and securely connected to the controlling device, the ink container having a tip selectively extending out from the aperture of the bottom barrel; and, a sleeve force fitted into a sleeve hole defined in the controlling device, the sleeve defining a through hole, a receiving hole communicating with the sleeve hole and a pressure hole communicating the receiving hole with the air for balancing the pressure inside the through hole and the receiving hole with the air, multiple retaining pieces are formed in an inner surface defining the through hole so as to securely clamp the ink container which partially extends into the receiving hole between the retaining pieces.