Patent ID: 7018124
Filing Date: 2006-03-28
Classification: B43K

Abstract:
1. A writing implement having a barrel provided with a separate front cap or a front cap formed integrally with the barrel, and a writing member placed in the barrel, pushed constantly backward by a return spring and capable of axially sliding in the barrel, said writing implement comprising: a rotating cam engaged with a back end part of the writing member; a back cap provided on its inner surface with a fixed cam and fixedly attached to a back part of the barrel; a hollow plunger placed between the back cap and the rotating cam and having an externally threaded back part provided with an external thread; a stylus having an internally threaded bore provided with an internal thread in engagement with the external thread of the externally threaded part of the plunger, and provided on its outer surface with protrusions; and a hollow push button placed axially slidably in the back cap, and provided with guide means for guiding the protrusions of the stylus in its inner surface, and an opening through which the stylus is projected in its back end, wherein depth of back end parts of the external thread of the externally threaded part is reduced slightly to increase frictional resistance against turning of the push button.