A bolt-action pen body is adapted as a universal receiver of an ink cartridge refill. The bolt action pen includes a hollow cylindrical pen body. A tip is removably coupled with an outer barrel at the distal end of the pen body. A refill cartridge is selectively extensible and retractable from the tip by a lever action movement of a bolt and a bolt carrier within a slot defined through a sidewall of the pen body. The bolt action pen provides for universal adjustment to various shapes of refill cartridges. An inner barrel is coupled with the pen body and is configured to adjust the pen body to a longitudinal length of the refill cartridge. A collet carried within the tip is configured for compressive adjustment to a diameter of writing end of the refill cartridge.

A writing instrument for alternating between an active stylus tip and an ink pen tip which is retractable from and displaceable through an annular opening at one end of the writing instrument.

A writing instrument for alternating between an active stylus tip and an ink pen tip which is retractable from and displaceable through an annular opening at one end of the writing instrument.

A writing instrument for alternating between a active stylus tip and an ink pen tip which is retractable from and displaceable through an annular opening at one end of the writing instrument is disclosed.

A writing instrument for alternating between a active stylus tip and an ink pen tip which is retractable from and displaceable through an annular opening at one end of the writing instrument is disclosed.

Articulated pens are provided. A pen includes: a shank; an ink tube comprising a first section, a second section, a third section, and a fourth section; a writing tip connected to the fourth section; a first guide rail connected to the shank and that bends the ink tube at a first angle between the first section and the second section; and a second guide rail pivotally connected to the first guide rail and that bends the ink tube at a second angle between the third section and the fourth section. Pivoting the second guide rail relative to the first guide rail adjusts a third angle between the second section and the third section.

Articulated pens are provided. A pen includes: a shank; an ink tube comprising a first section, a second section, a third section, and a fourth section; a writing tip connected to the fourth section; a first guide rail connected to the shank and that bends the ink tube at a first angle between the first section and the second section; and a second guide rail pivotally connected to the first guide rail and that bends the ink tube at a second angle between the third section and the fourth section. Pivoting the second guide rail relative to the first guide rail adjusts a third angle between the second section and the third section.

A fluid application device including a reservoir intended to contain a free fluid and a fluid delivery device, wherein the reservoir is sealed by a valve having a self-healing material. The fluid application device includes a tubular means for piercing the valve and for simultaneously placing fluid from the reservoir in communication with the fluid delivery device.

A retractable writing instrument has a marking component for marking a writable surface. A barrel houses at a portion of the marking component, as well as an extension/retraction mechanism. The barrel has a slider portion. An internal magnet is adapted to operate the extension/retraction mechanism and positioned for operating movement along a length of the slider portion for extending and retracting a portion of the marking component. A slidable magnetic ring has an inner diameter for receiving the slider portion and is adapted to magnetically cooperate with the internal magnet.

A retractable writing instrument has a marking component for marking a writable surface. A barrel houses at a portion of the marking component, as well as an extension/retraction mechanism. The barrel has a slider portion. An internal magnet is adapted to operate the extension/retraction mechanism and positioned for operating movement along a length of the slider portion for extending and retracting a portion of the marking component. A slidable magnetic ring has an inner diameter for receiving the slider portion and is adapted to magnetically cooperate with the internal magnet.