Patent ID: 8550735
Filing Date: 2013-10-08
Classification: B43K

Abstract:
1. A writing instrument comprising: a barrel extending along a central axis between a front end and a rear end provided with a front aperture and a rear aperture; a writing tip movable through the front aperture between an extended position and a retracted position for which the writing tip is situated within the barrel; an ink cartridge having a front end connected to the writing tip and a rear end; an actuating mechanism that includes a plurality of parts for extending and retracting the writing tip upon actuation of an actuation member; and a cushioning device enabling a retraction of the writing tip from the extended position using a spring member and an additional spring member when an excessive writing pressure is exerted on the writing tip by a user, wherein the cushioning device comprises the spring member that is elastically deformable in the central axis direction, wherein the actuating mechanism has a single-piece tubular part being movable relative to the barrel along the central axis, the movable tubular part being connected to the rear end of the ink cartridge and comprising the spring member, wherein the spring member comprises at least one wavy portion extending globally in the direction of the central axis and having at least a first and a second curve distributed on both sides of an extension axis, the at least one wavy portion having a continuously curved shape, wherein the spring member has a free end abutting the barrel toward the barrel rear end and has a through hole extending along the central axis, wherein the cushioning device further comprises the additional spring member that is formed by a metallic helical spring provided around said movable tubular part, between the movable tubular part of the actuating mechanism and the barrel, and wherein a stem extending within the through hole of the spring member, connects the actuating member to the actuating mechanism.