An improved hand held pen holding sleeve comprising a rigid barrel with a through bore abutting a deformable finger grip element also with a through bore. The pen holding sleeve is devoid of an ink reservoir or ink cartridge. The through bore of the pen holding sleeve is sized and configured to accept disposable stick pens and common pencils as the refill element. The deformable finger grip element is removable from the rigid barrel. The deformable finger grip element, formed of an elastomer, is the sole means for capturing and retaining the refill element within the pen holding sleeve.

A writing, drawing, marking and/or cosmetic device, wherein the device includes at least one shaft and at least one inner body, wherein the at least one shaft is formed from concrete-containing material. The shaft at least partially surrounds the inner body. In the installation position the shaft is secured in an axial direction against axial displacement by a closing cover and a front part and a prestress is formed in the shaft in the axial direction via the closing cover and the front part.

Convertible writing instrument assemblies are provided, including an outer barrel having a tapered nosecone with an aperture for a writing instrument tip and a grip portion, and an aperture for receiving an eraser or a push button therethrough, wherein the writing instrument assembly provides selective access to a volume defined by the outer barrel, and wherein the outer barrel and the volume are collectively configured to operably and interchangeably receive a mechanical pencil insert having the eraser and a retractable pen insert having the push button. Mechanical pencils and pens utilizing the convertible writing instrument assemblies are also provided, along with kits for providing such mechanical pencils and pens.

A mechanical pencil 1 includes a rotary member having a ball chuck 11, a rotation drive mechanism 30 having a rotary part 40 and driving the rotary part to rotate in one direction upon receiving a retracting motion in the axial direction due to writing pressure received by the lead clutched by the ball chuck and an advancing motion in the axial direction due to release of the writing pressure, and a cylindrical member 8 made of metal provided at one of the cylindrical barrel and the rotary member, the rotary member configured so as to rotate upon receiving rotational drive force of the rotary part whereby the lead clutched by the ball chuck rotates, the other of the cylindrical barrel and the rotary member slidingly contacting the surface of the cylindrical member whereby rotation of the rotary member due to the rotation drive mechanism is supported.

A writing instrument includes a combination of a multi-color pen and a mechanical pencil.

A writing instrument includes a combination of a multi-color pen and a mechanical pencil.

A multi-function writing instrument comprises a body extending in an axial direction and a radial direction, and having at least two writing elements arranged inside the body, each writing element comprising a writing head and a button, at least one button extending in the radial direction through a window and allowing the writing element to be moved between a retracted position in which the writing head is retracted into the body and a writing position in which the writing head projects from the body, and one of the writing elements being a leadholder system comprising a leadholder mechanism and a lead container, the button of the leadholder system comprising a lead-insertion channel extending in the axial direction.

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.

An inductor core includes a magnetic main body having a pillar shape and comprised of a magnetic material. The magnetic main body includes an inclined portion including an inclined surface that constitutes an outer circumferential surface of a truncated cone having an outer diameter increasing from one end toward the other end; and a straight body portion that is coaxial with the inclined portion and includes an outer peripheral surface that constitutes an outer circumferential surface of a cylindrical column body extending from the other end toward the one end, the straight body portion being connected to the inclined portion. An arithmetic mean roughness Ra of an outer peripheral surface of the straight body portion located at or around the other end is smaller than an arithmetic mean roughness Ra of an outer peripheral surface of the straight body portion that is disposed at or around the inclined portion.

Disclosed is an electronic mechanical pencil including: a first body part for accommodating a mechanical pencil cartridge for enabling writing through a mechanical pencil lead provided therein, a camera module capable of recognizing a user's writing through the mechanical pencil cartridge, a board part connected to the camera module, a power supply part for supplying power to the board part and the camera module; and a second body part for accommodating a push button part for drawing out the mechanical pencil lead from the mechanical pencil cartridge, and a pressure sensor part coupled to a lower end of the push button part and capable of coming into contact with the mechanical pencil cartridge in order to detect pressure of the mechanical pencil cartridge against a paper, wherein the first body part and the second body part are separated from each other in order to refill the mechanical pencil cartridge.