A compact writing instrument includes a barrel and a cap. A majority of a length of the barrel and a writing element carried thereby may be received by the cap when the barrel and the cap are placed in a stored position, providing a compact stored arrangement. The cap may be secured to the barrel in a writing arrangement that extends a length of the writing instrument significantly; for example, to a conventional writing instrument length. Engagement features of the cap and barrel may include steep threads that enable the cap to be assembled with and disassembled from the barrel with one rotation (360°) or less. A clip on the cap may include a closed end that defines a receptacle, with the closed end and receptacle extending beyond a corresponding end of the cap. In addition, the closed end and receptacle may extend partially over the corresponding end of the cap.

Provided is a self-made LED luminous floating oil pen, including an empty pen tube. One end of the empty pen tube is threadedly connected to a plastic shell, and the inner cavity of the empty pen tube is filled with a mineral oil. Two sides of the inner cavity of the empty pen tube are provided with LED lamp beads distributed at equal intervals, and floating action figures are arranged in the inner cavity of the empty pen tube. Glitter and hollow plastic balls are filled in the inner cavity of the empty pen tube.

A thermochromic writing instrument including a writing body, storing a thermochromic ink therein, stored in a barrel; an operation body provided in the barrel to be operated to longitudinally move the writing body; a nib of the writing body configured to be capable of appearing from a front end of the writing instrument, wherein the writing instrument 1 further includes a friction unit, for rubbing handwriting in the thermochromic ink and capable of thermally changing the color of the handwriting by frictional heat generated at that time, and at least one clip body as the operation body, the friction unit 10 is provided at a rear end of the barrel, and the clip body is provided in an area other than the rear end of the barrel.

A writing instrument includes a barrel and a cap capable of being assembled with and secured to the barrel. The barrel carries a writing instrument. The cap carries a clip. A free end of the clip includes a detent that can be received by a corresponding indentation of an exterior surface of an external portion of the barrel when the cap is assembled with the barrel. The detent of the clip and the indentation of the barrel are capable of securing the cap and the barrel in their assembled relationship. The writing instrument may be compact. Methods of using a writing instrument include securing a cap of the writing instrument to a barrel of the writing instrument by causing a detent of a free end of a clip of the cap to engage a corresponding indentation of an exterior portion of the barrel.

A writing instrument, in particular a pen, comprises a housing comprising a front barrel and a rear barrel, the front barrel having a front opening, two or more cartridges for storing colorants or inks, each cartridge having a writing tip, at least one actuator for selectively moving one of the cartridges within the housing so that the writing tip of a selected cartridge extends through the front opening of the front barrel, and a cartridge guide member which is designed to guide the movement of the cartridges within the housing. The front barrel and to the cartridge guide member are designed to be removed from the rear barrel for replacing one or more of the cartridges. In particular, the front barrel and the cartridge guide member may be removed from the rear barrel while the cartridge guide member may remain mounted to the front member at the same time.

A compact writing instrument includes a barrel and a cap. A majority of a length of the barrel and a writing element carried thereby may be received by the cap when the barrel and the cap are placed in a stored providing a compact stored arrangement. The cap may be secured to the barrel in a writing arrangement that extends a length of the writing instrument significantly; for example, to a conventional writing instrument length. Engagement features of the cap and barrel may include steep threads that enable the cap to be assembled with and disassembled from the barrel with one rotation (360°) or less. A clip on the cap may include a closed end that defines a receptacle, with the closed end and receptacle extending beyond a corresponding end of the cap. In addition, the closed end and receptacle may extend partially over the corresponding end of the cap.

A thermochromic ink writing instrument comprising a body extending along an axis, the body having a first end and a second end opposed to the first end along the axis, the first end being provided with a writing tip and with an eraser, wherein the writing tip is fed with thermochromic ink, wherein the writing tip is fixed with regard to the body and the eraser is movable along the axis with regard to the body, and the thermochromic ink writing instrument further comprising a helical-cam propelling mechanism configured to move the eraser along the axis between a retracted position and a protruding position.

An erasable ink writing instrument comprising a body extending along an axis, the body having a first end and a second end opposed to the first end along the axis, the first end being provided with a writing tip and with an eraser, wherein the writing tip is fed with erasable ink, wherein the writing tip is fixed with regard to the body and the eraser is movable along the axis with regard to the body, and the erasable ink writing instrument further comprising a helical-cam propelling mechanism configured to move the eraser along the axis between a retracted position and a protruding position. The erasable ink is a peelable ink and the eraser is a friction body.

A writing instrument includes a body, a nosecone, and an adaptor each being of generally hollow tubular shape. Each the body, the nosecone, and the adaptor each have a first end and a second end. The first end of the adaptor is configured to slidably couple to the nosecone second end. The second end of the adaptor is coupled to the first end of the body. The writing instrument includes a writing element with a mounting end and a writing end where the mounting end is removably coupled to the second end of the body. The writing instrument includes a locking mechanism configured to selectively lock the nosecone in a storage position or a writing position. In the storage position, the nosecone extends and covers the writing end. In the writing position, the nosecone retracts and the writing end of the writing element extends beyond the nosecone.

The writing instrument includes a body, a nosecone, and an adapter. The body, nosecone, and adapter each include a generally hollow tubular shape and an inner surface, outer surface, first end, and second end. The first end of the adapter is coupled to the second end of the nosecone. The second end of the adapter is configured to slidably couple to the first end of the body. The writing instrument includes a writing element with a mounting end and a writing end. The mounting end of the writing element is removably coupled to a second end of the body. The adapter includes a track and the track includes a recessed channel in the outer surface of the adapter. The body includes at least one protrusion that extends inwards from the inner surface of the body. The protrusion slidably engages with the track of the adapter.