A stylus suitable for an electronic device is provided. The stylus comprises a pen barrel and a core. The pen barrel has a sidewall and at least one first protrusion, and the first protrusion is located at an inner side of the sidewall. The core movably passes through the pen barrel. The core has a pen tip and at least one second protrusion. Under a first status, the first protrusion and the second protrusion are dislocated from each other. Under a second status, the first protrusion and the second protrusion are aligned with each other to make a part of pen barrel expand and deform.

A hand-held device includes a first portion and a second portion. The first portion is engaged at least in part with the second portion while being movable in translation in an axial direction relative to the second portion. The first portion presents a first distal end while the second portion presents a second distal end opposite from the first distal end in the axial direction. A blocking device is configured to prevent the first portion from moving in translation in the axial direction relative to the second portion only when, considered in the gravity direction, the first distal end is arranged above the second distal end. The blocking device includes a chamber and a ball or the equivalent housed in the chamber.

A multi-purpose combination writing instrument is provided. The instrument can comprise a writing instrument holder, with 2 casing members connected together by a retractable unwinding tool. The retractable unwinding tool can be automatically retractable. One or more removable individual writing instruments can be reversibly attached to the writing instrument holder. An individual writing instrument is provided that comprises a male connector adapted to be mated to a corresponding female connector or that comprises an external screw thread. A casing member of a writing instrument holder is provided, comprising an automatic retracting mechanism stored in the casing member and adapted to be attached to a retractable unwinding tool and adapted to allow the retractable unwinding tool to automatically retract. Another multi-purpose combination writing instrument is provided, comprising a writing instrument holder that is fan-shaped (like a hand-held fan). Yet another multi-purpose combination writing instrument is provided, comprising a writing instrument holder comprising zero, one, or two casing members comprising a hinge assembly, which comprises a hinge.

A training pen for writing has a housing, a pen cap releasably attached to the housing, a retractable ink cartridge with a writing tip extending within an inner cavity of the housing and the cap, and three flexible, arcuate tabs extending from a lower end of the housing. The cap has six sides with side openings defined in alternating sides of the cap and a lower aperture defined at a lower end of the cap. The tabs extend through the side openings when not in use. A user can push the writing tip through the lower aperture by simultaneously depressing all of the tabs into grooves defined within the surface of the cap. Release of the tabs repositions the writing tip within the cap. Use of the pen can train a user io to properly grasp a writing utensil.

A knock type pen including a housing, a lead which is received in the housing and has an end to which a nib is coupled, and a knock element which protrudes from top of the housing and is pushed, a regulating element which is rotatably installed on an outer circumference of the housing, and a locking element which is provided in the housing and moves up and down by rotation of the regulating element, wherein when the locking element moves up, a press of the knock element is limited by the locking element.

A knock type pen including a housing, a lead which is received in the housing and has an end to which a nib is coupled, and a knock element which protrudes from top of the housing and is pushed, a regulating element which is rotatably installed on an outer circumference of the housing, and a locking element which is provided in the housing and moves up and down by rotation of the regulating element, wherein when the locking element moves up, a press of the knock element is limited by the locking element.

The present disclosure relates to a knock type pen including a body in which a lead and a spring which provides an elastic force to the lead are received, and a knock section which is coupled to a rear end of the body and includes a knock body and a rotary cam to push the lead out of a tip of the body or receive the lead inside, wherein the knock type pen includes a cutout groove which extends in one direction along an axial direction of the body, a slit hole which extends along a downward direction from an upper end of the cutout groove, an insert hole which is formed in a direction perpendicular to the slit hole from the upper end of the cutout groove, and a locking section which moves up and down along the slit hole.

The present disclosure relates to a knock type pen including a housing, a lead which is received in the housing and has an end to which a nib is coupled, and a knock element which protrudes from top of the housing and is pushed, a regulating element which is rotatably installed on an outer circumference of the housing, and a locking element which is provided in the housing and moves up and down by rotation of the regulating element, wherein when the locking element moves up, a press of the knock element is limited by the locking element.

A writing instrument may include an elongated tubular casing, an elongated writing medium cartridge and a tubular elastic spring element. The tubular elastic spring element comprises a first portion and a second portion. The second portion comprises a wall comprising a plurality of apertures.

A writing instrument may include an elongated tubular casing, an elongated writing medium cartridge and a tubular elastic spring element. The tubular elastic spring element comprises a first portion and a second portion. The second portion comprises a wall comprising a plurality of apertures.