Writing instrument having a body, a clip, and a retractable eraser device movable between a first position and a second position, the clip forming a housing that is designed to receive all or part of a gripping portion of the eraser device in the first position.

Writing instrument having a body, a clip, and a retractable eraser device movable between a first position and a second position, the clip forming a housing that is designed to receive all or part of a gripping portion of the eraser device in the first position.

A multifunctional writing device includes a hollow body, wherein the hollow body comprises one or more cavities configured to store a mechanical pencil, a multifunctional drawing tool, a compass needle, a stylus, an eraser, a USB flash drive, an imaging system, a projector pen, a set of cameras, and attaches a projector stick. The first writing member comprises a mechanical pencil system being provided in a first portion of the hollow body and a touch ID sensitive barrel. A second projector member comprises a projector pen and attaches a projector stick. The first portion of the hollow body is at the opposite end of the second portion of the hollow body. The multifunctional writing device allows for projecting self-leveled and auto calibrated geometry drawing tools. A method for digitizing the written data on paper and a system for secure, auto proctored, and auto grading of examinations is provided.

A method for manufacturing a writing instrument includes inject molding a cushion spring of the writing instrument to form the cushion spring as one piece, and axially pushing out the cushion spring from a molding die set. The cushion spring elastically supports a tip of the writing instrument in an axial direction to a barrel of the writing instrument. The forming of the cushion spring includes forming a plurality of apertures in the cushion spring, one of the apertures being relatively arranged with another one of the apertures by rotations of angles at 90 degrees about the axial direction on an outer peripheral surface thereof, and forming a plurality of displacement regulating protrusions, one of the protrusions being relatively arranged with another one of the protrusions by rotations of angles at 90 degrees about the axial direction.

A method for manufacturing a writing instrument includes inject molding a cushion spring of the writing instrument to form the cushion spring as one piece, and axially pushing out the cushion spring from a molding die set. The cushion spring elastically supports a tip of the writing instrument in an axial direction to a barrel of the writing instrument. The forming of the cushion spring includes forming a plurality of apertures in the cushion spring, one of the apertures being relatively arranged with another one of the apertures by rotations of angles at 90 degrees about the axial direction on an outer peripheral surface thereof, and forming a plurality of displacement regulating protrusions, one of the protrusions being relatively arranged with another one of the protrusions by rotations of angles at 90 degrees about the axial direction.

A friction body is configured to discolor handwriting written with a thermochromic ink with frictional heat. The friction body includes a viscoelastic body, and has a Shore A hardness (based on JIS K 7215) immediately after start of contact of an indenter point of from 55 to 95.

A position indicator can visibly form handwriting, and can erase the handwriting and simultaneously erase corresponding electronic data. The position indicator includes a casing including a first indicating portion and a second indicating portion. The first indicating portion includes a core body capable of visually forming handwriting corresponding to a writing operation of the position indicator, and a first circuit element that enables a position indicated on a sensor surface to be detected by a sensor. The second indicating portion includes an erasing member that projects from the casing, which visually erases the handwriting formed by the core body, and a second circuit element that enables a position indicated on the sensor surface to be detected by the sensor. The second indicating portion includes a holder that holds the erasing member with respect to the casing, and the holder includes a member that contributes to an interaction with the sensor.

A thermochromic writing instrument capable of causing curiosity and interest of a user by configuring an eraser to be easily separated from the main body of the thermochromic writing instrument and to be shaped into various character dolls. A rotation member is inserted into a pen body and a hollow upper cover is detachably coupled to an outside of the upper portion of the pen body, a first eraser is connected to the rotation member by a connection member, a connection portion of an operation member is disposed in a groove formed at one side of the side wall of the pen body, the first body portion of the operation member is inserted into the pen body and a clip portion of the operation member is exposed to the outside of the pen body.

A thermochromic writing instrument capable of causing curiosity and interest of a user by configuring an eraser to be easily separated from the main body of the thermochromic writing instrument and to be shaped into various character dolls. A rotation member is inserted into a pen body and a hollow upper cover is detachably coupled to an outside of the upper portion of the pen body, a first eraser is connected to the rotation member by a connection member, a connection portion of an operation member is disposed in a groove formed at one side of the side wall of the pen body, the first body portion of the operation member is inserted into the pen body and a clip portion of the operation member is exposed to the outside of the pen body.

A knocking-type writing instrument has a writing refill, such as a pencil lead or an ink cartridge, that is advanced by knocking a knocking member, and an eraser held by an eraser holder disposed at a rear part of the knocking member. When the writing instrument is inclined so that the eraser side faces downward, a control pin provided in the eraser holder and a movable stopper drop by their own weights along a sliding groove of the knocking member. When the control pin drops a predetermined distance and enters a circumferential locking groove provided at a rear end of the sliding groove, detachment of the control pin is prevented by the stopper, and the eraser holder is unable to retract to the inside of the knocking member. In this state, a radial projection on the control pin abuts a rear end face of the knocking holder, whereby the knocking member is locked and can no longer be knocked, and feeding of the writing refill is prevented.