The present disclosure relates to a knock type pen including a housing in which a lead storing ink is received, a knock element which is placed moveably up and down in the housing, and has a button section protruding from an open upper side of the housing in an upper end part and a toothed protrusion coupled to a lower end part, and a rotary cam which is disposed between the lead and the knock element and rotatably placed in the housing, and has a guide protrusion which comes into contact with the toothed protrusion.

The present disclosure relates to a knock type pen including a housing in which a lead storing ink is received, a knock element which is placed moveably up and down in the housing, and has a button section protruding from an open upper side of the housing in an upper end part and a toothed protrusion coupled to a lower end part, and a rotary cam which is disposed between the lead and the knock element and rotatably placed in the housing, and has a guide protrusion which comes into contact with the toothed protrusion.

A shaft cylinder having an opening at a front end thereof, a tip holder movable in an axial direction of the shaft cylinder, a tip projectable and retractable in conjunction with a movement of the tip holder, an annular member loosely fitted onto an inner periphery of the opening of the shaft cylinder to be movable in an axial direction of the shaft cylinder with respect to the shaft cylinder, and an elastic member capable of connecting the tip holder and the annular member such that the tip holder and the annular member are movable relatively to each other. A contact surface tapered toward the front end is formed on at least a part of an outer periphery of the annular member. A cutout is formed on the annular member such that an inner diameter of the annular member is reduced when a load is received by the contact surface.

An electronic pen has increased strength, especially a pen tip portion that is not bent or broken even if the electronic pen is slimmed down. A core unit includes a ferrite core on which a coil is wound and a core rod. The core rod is fixed from a first end of the ferrite core to a second end of the ferrite core at a position including a center axis of the ferrite core and projects at an end thereof from the first end of the ferrite core. The ferrite core includes a first coil non-winding portion on which the coil is not wound provided on the pen tip side of the ferrite core. In operation, the end of the core rod and part of the first coil non-winding portion of the ferrite core project from an opening of a housing of the electronic pen.

A retractable writing instrument includes a push member including a clip and a protruding and retracting mechanism that causes a pen point to protrude from and retract into a front end of the barrel at a frontward press on the push member, without the push member rotating with respect to the instrument. The protruding and retracting mechanism includes cam teeth and cam grooves formed in an inner face of the barrel, a rotary member including protuberances engageable alternately with the cam teeth or the cam grooves, a cam member connected to the push member and includes cam projections rotating the rotary member, and engagement projections engaged with the cam grooves in the inner face of the barrel so as to be movable in the longitudinal direction; and a resilient element that biases the writing element rearward. The push member and the cam member are in detent engagement with each other.

Provided is a knock type writing instrument provided with a simple mechanism allowing a stable fretting operation or the like. A knock type writing instrument 1 is provided with: a shaft cylinder 2; a refill 5 arranged inside the shaft cylinder 2; a spring 6 biasing the refill 5 backward; an operation part 20 pressed forward against a biasing force of the spring 6 in a knocking operation; and a main rotor 30, and is switchable between a writing state and a non-writing state with the knocking operation. The knock type writing instrument 1 is further provided with: a knock locking member 50 movable forward and backward inside the shaft cylinder 2 due to gravity; and a locking part 60 provided on a side of the shaft cylinder 2 and capable of being locked with the knock locking member 50. When a front end of the shaft cylinder 2 is directed upward, the knock locking member 50 moves backward to be locked with the locking part 60 to prevent forward movement of the operation part 20.

A writing instrument includes a first barrel and a second barrel that are able to rotate relative to each other about the axial direction, and presenting a first distal end and a second distal end, a writing tip being arranged at the first distal end while a pad for a capacitive screen is arranged at the second distal end, the writing tip and/or the pad for a capacitive screen being retractable by causing the first barrel to rotate relative to the second barrel, and where a barrel among the first barrel and the second barrel includes a tongue extending in the circumferential direction, the tongue being configured to establish electrical contact with the other barrel among the first barrel and the second barrel.

Provided is a retractable writing instrument including a pen point, a barrel, and a clip. The pen point is configured to be in a state of projecting from the barrel or a state of being retracted into the barrel by sliding the clip in a longitudinal direction of the barrel. The clip includes a clip body extending in the longitudinal direction of the barrel, a ball portion provided on a front side of the clip body and projecting in a direction of a surface of the barrel, and a clip base provided on a rear side of the clip body and is configured to produce a biasing force in a direction of a surface of the barrel. The surface of the barrel includes a guide groove extending in the longitudinal direction of the barrel and provided with a pair of side surfaces to restrict lateral movement of the ball portion, and the guide groove has a through groove capable of causing the ball portion to be in a noncontact state in a direction of the biasing force at least when the pen point is in the retracted state.

A sound confining ball-point-pen 100 includes a body, which is in vacuum state, having a first opening at one end and a second opening at another end, a knocking mechanism placed in the body at a location close to the second opening, a core of the sound confining ball-point-pen 100 stored in the body, the core being moved by the knocking mechanism, a protective cap, which is fixed to the body, for covering the second opening, whereby the protective cap prevents air for entering into the body from the knocking mechanism, and a sealing means placed in the body at the location close to the first opening for sealing the first opening when the core of is set back into the body.

The present disclosure provides a retractable writing utensil including: a barrel; a writing body; and a knocking member causing a portion of the writing body to protrude and retract from a front end of the barrel by knocking operation of pushing the knocking member forward. The retractable writing utensil includes an interlocking member interlocking with the knocking member, the interlocking member moves forward together with the knocking member by pushing the knocking member forward. The knocking member and the interlocking member are capable of a relative rotation to each other and engaged with each other in a state in which the relative rotation is restricted.