Abstract: A writing pen which comprises a vacuum controlled reservoir for containing a supply of ink having a lower viscosity than conventional ball pen ink, a writing tip which may be any one of a number of interchangeable types and a finned collector including a weir and feed which are arranged to induce capillary flow of the ink from the reservoir to the tip for writing purposes.

Abstract: A socket for a ball point pen comprises a hollow sleeve receiving a writing ball at the forward end, a rod member forcefully inserted into the sleeve to be pressed at the forward end against the writing ball, and ink passageways defined between the sleeve and rod member so as to extend throughout the socket. The sleeve is provided with a communication section for causing the ink passageways to communicate with the outside of the socket, thereby attaining a reliable delivery of ink from the ink passageways to the writing ball and preventing ink from leaking out of the pen body through an air passage provided at the forward end portion of the barrel of the ball point pen.