Patent ID: 6039484
Filing Date: 2000-03-21
Classification: B43K

Abstract:
A writing instrument comprising:a barrel;a tip element provided at a front end of the barrel;means axially movably incorporated within the barrel for advancing a writing medium:a resilient element incorporated in the barrel for biasing the writing medium advancing means backward;a knock member inserted in the rear end portion of the barrel and detachably mounted on the rear end of the writing medium advancing means;the knock member having a pair of spaced apart flanges provided thereon;cooperating means on the knock member and barrel for preventing the knock member from rotating relative to the barrel;the cooperating means comprising engaging projection means mounted on the knock member, and engaging groove means formed in an inner portion of the barrel;the engaging projection means and engaging groove means being engaged with each other, to thereby prevent the knock member from rotating relative to the barrel; anda rattle-preventive means provided between the pair of spaced apart flanges for preventing the knock member from rattling.