Abstract: The invention relates to a sealing device for writing tool. The sealing device comprises a sealing sleeve having an aperture at its lower end through which a marking material or lead can pass; an arc-shaped sealing port integrated with the sealing sleeve at a front end and divided into parts by divisional lines that extend in an axial direction. When the sealing port is open, it communicates with the aperture. An elastic clamping member covers a periphery of a root portion of the sealing port to clamp the sealing device tightly and to prevent damage. The clamping device can also enhance the resilient force of the sealing port. A projecting rib is formed on the root portion of the sealing port, correspondingly, a peripheral flange mating with the projecting rib is formed on the elastic clamping member. A shoulder is formed on the lower portion of the said sealing sleeve to increase the contact area and improve the sealing effect between the sealing sleeve and the writing tool.

Abstract: A combination touch-sensitive screen stylus structurally designed for notebook computers, personal digital assistants., and other devices equipped with touch-sensitive screens that is comprised of a pointed cover, an outer barrel, an inner barrel, a end sleeve, and an end cover. The pointed cover is sleeved over the front extremity of the outer barrel and has a rubber tip embedded in its front extremity. The outer barrel is sleeved onto the front of the inner barrel and has a hard writing tip disposed in its front end. The inner barrel contains a pen refill cartridge that extends to its anterior section, with the end sleeve and the end cover fitted onto the rear extremity of the inner barrel. The end cover has a reset pin extending from its front end. As such, the combination touch-sensitive screen stylus of the present invention is equipped with a soft rubber tip, a hard writing tip, a pen, and a reset pin that are utilized as required by the user.

Abstract: A pressure-sensed ink-filled pen comprises at least a pen tube, a valve, a filler seat and a filler. An ink outlet is formed within the front portion of the pen tube. An U-shape valve made of a relatively soft material is mounted in front of the ink outlet. A filler seat embedding a filler at the front end thereof is received in a flexible relation within the front portion of the pen tube, allowing a longitudinal movement. By pressing the filler and the filler seat at one end to cause another end to open the valve, a pressure-sensed ink-filled pen with proper ink supply is formed.

Abstract: An ink chamber pressure enhancing control device, which includes a valve block mounted in the barrel of a writing instrument above an ink chamber, a cap axially movably mounted in the valve block above a valve port in the valve block, the cap having an air inlet, a piston supported on a spring member above the ink chamber in the barrel, wherein the piston is forced upwards by the spring member to close the valve port, enabling an air chamber to be formed within the cap and the valve block above the valve port, and from the air inlet at the cap and the valve port is forced into the ink chamber in the writing instrument when the cap is depressed.

Abstract: A pen cap for closing on a ball-point pen to prevent ink leakage, the pen cap including a cap body, a sealing cap covered on the cap body, and a ball valve mounted inside the cap body within the sealing cap and moved between inside ribs in the cap body and inside ribs in the sealing cap. Closing the pen cap on the pen causes excessive air to pass through an air passage formed by gaps among the inside ribs to the outside of the pen cap via an exhaust hole on the sealing cap, and the air passage is closed when the writing tip of the pen is engaged into a tapered hole on one cylindrical rod projecting from the ball valve.