Abstract: Disclosed are an ink composition for oil-based ballpoint pens which exhibits soft writing sensation due to low viscosity of 300 to 3000 cps, enables writing even at low temperatures and thus exhibits superior stability, and is free of leakage (of ink), and an oil-based ballpoint pen using the same.

Abstract: A writing instrument is disclosed which includes a cylindrical barrel and an end cover having a robust structure and attached to the cylindrical barrel. The end cover comprises a cylindrical base attached to a rear end portion of the cylindrical barrel, a cover body fitted around an outer peripheral surface of the cylindrical base, a stopper ring fitted around an outer peripheral surface of at least a fitted portion between the cylindrical base and the cover body, and a cooperation structure for facilitating enhancing of holding force which is exerted on the cover body by the cylindrical base and the stopper ring.

Abstract: A liquid supply device utilizing a rotating cam mechanism for supplying a liquid. In the liquid supply device for smoothly supplying a liquid with the assistance of pressurizing action, switching operation by the rotating cam mechanism can be carried out reliably. A rotating cam mechanism 16 which can move the liquid housing tube 14 forward and backward includes a rotating cam 40 movable between a front position and a rear position and a pressurizing space 18 to be compressed to be able to pressurize an inside of the liquid housing tube 14 when the tip end chip 32 is in the protruding position is provided in a rear portion in the rotating cam 40.

Abstract: A clip mounting structure for a writing implement has a shaft tube, a clip mounted at the rear part of the shaft tube, and an insertion member inserted into the rear part of the shaft tube. A clip mounting section to which the rear part of the clip is fitted and aligned is formed at the rear part of the shaft tube. Mounting sections curved in the direction along the inner peripheral surface of the shaft tube are formed at opposite sides of the rear part of the clip. Fitting recesses into which the mounting sections of the clip are fitted are formed in the outer wall of the insertion member. With the mounting sections of the clip fitted in and engaged with the fitting recesses in the insertion member, the insertion member is inserted into the rear part of the shaft body to fit the rear part of the clip into the clip mounting section of the shaft tube. Thus, the insertion member is engaged in position inside the shaft tube.

Abstract: A needle threading device is disclosed which comprises a first mechanism having a hole for receiving a needle and a slit for receiving a thread, a second mechanism having a threader pin and pivotally supported by the first mechanism so as to be pivotable between a first position and a second position different from the first position, the threader pin enabling the thread to pass through an eye of the needle when the second mechanism is pivoted to the second position from the first position, a first biasing member urging the second mechanism to the first position, an operating member causing the second mechanism to be pivoted to the second position against an action of the first biasing member, and a second biasing member urging the operating member and the second mechanism in a direction in which they are spaced away from each other.

Abstract: A knock-type propelling container includes a body storing a medium therein and having a tip end opening for allowing the medium to be propelled therefrom, a propelling member slidably arranged in the body and capable of propelling the medium toward the opening, the propelling member being provided with a forward/rearward extending prolongation portion having engaging-stop portions formed at fixed intervals in a forward/rearward direction, a knock member provided at the body so as to be reciprocably moved relative to the body, a thrusting member arranged in the body so as to be moved forward by knocking the knock member, and having an engagement portion engageable with the engaging-stop portions, and a detent member fixedly arranged in the body and engageable with the propelling member.

Abstract: A lead cartridge adapted for storing leads and capable of being detachably connected to a lead feeding mechanism of a mechanical pencil to supply the leads one by one to the lead feeding mechanism, the mechanical pencil being provided with an interference part, the lead feeding mechanism being provided with a receiving part. The lead cartridge includes a tank part for storing the leads, a tip end connection part capable of being detachably fitted with the receiving part of the lead feeding mechanism, a lead port provided on a tip end side of the tank part to allow one of the leads in the tank part to pass from the tank part, and a swing cover arranged in the lead cartridge to be swingable between a closing position where the swing cover closes the lead port, and an opening position where the swing cover opens the lead port.

Abstract: A knock-type writing instrument is provided, which allows an easy refill exchange with a simple operation while inhibiting deformation of slits, breakage of a shaft tube, etc., during the refill exchange.

Abstract: In a stick-shaped material propelling container capable of propelling and retracting a stick-shaped material, the influence of variation of the dimension of the stick-shaped material can be made small. An inner barrel is slidably inserted in an outer barrel, an elastic body which urges the inner barrel rearward is provided between the inner barrel and the outer barrel, a chuck piece which holds a stick-shaped material is provided at a tip end portion of the inner barrel, and a chuck ring is inserted between the chuck piece and the outer barrel. A cross section of the stick-shaped material forms a triangular shape, the frictional force applying part which is in contact with the stick-shaped material to apply a frictional force is formed on an inner peripheral surface of the outer barrel, and the frictional force applying part abuts on a side in the vicinity of a vertex of the stick-shaped material in a cross section of the stick-shaped material.

Abstract: A mechanical pencil comprises a shaft cylinder (1), a lead pipe (3) axially movably inserted into the shaft cylinder (1) and biased in a retract direction, and a chuck body (45) provided within the shaft cylinder (1) in front of the lead pipe (3) for releasably griping a writing lead (S). The lead pipe (3) and the chuck body (45) are separated, the lead pipe (3) is inserted into the shaft cylinder (1) with axial movement thereof being permitted and circumferential rotation thereof being restricted, and the chuck body (45) is positioned within the shaft cylinder (1) in front of the lead pipe (3) so as to be movable in an axial direction and circumferentially rotatable. A lead rotation mechanism (5) is provided between a back part of the chuck body (45) and a front part of the lead pipe (3).

Abstract: A pivotal manipulation type writing instrument includes a pivotable body pivotable relative to a container main body and a writing element ejecting unit configured to actuate and move a slider to urge a writing element to be ejected from the container main body as the pivotable body is pivoted. The pivotable body is pivotable relative to the container main body by 360° in either left or right direction, and the writing element can be returned to a retracted state in which the writing element is retracted into the container main body from an ejected state in which the writing element is ejected from the container main body by moving the pivotable body in either left or right direction.

Abstract: Variations in the size of a stick-like object are accommodated, and abutments are urged to contact with the stick-like object with an appropriate pressure. A stick-like object feeding container is provided with: an outer sleeve 11 having a front spring shoe 11a formed on the internal circumference of the front portion of the outer sleeve; an inner sleeve 12 slidably inserted into the outer sleeve and having a rear spring shoe 12a provided on the outer circumference of the inner sleeve; a spring 13 abutting at its front and rear ends against the front spring shoe and the rear spring shoe, respectively, to bias the inner sleeve backward; a chuck 17 adapted to be capable of gripping, by its front end portion, the stick-like object inserted into the inner sleeve; and a chuck ring 18.

Abstract: A clip mounting structure for a writing implement has a shaft tube, a clip mounted at the rear part of the shaft tube, and an insertion member inserted into the rear part of the shaft tube. A clip mounting section to which the rear part of the clip is fitted and aligned is formed at the rear part of the shaft tube. Mounting sections curved in the direction along the inner peripheral surface of the shaft tube are formed at opposite sides of the rear part of the clip. Fitting recesses into which the mounting sections of the clip are fitted are formed in the outer wall of the insertion member. With the mounting sections of the clip fitted in and engaged with the fitting recesses in the insertion member, the insertion member is inserted into the rear part of the shaft body to fit the rear part of the clip into the clip mounting section of the shaft tube. Thus, the insertion member is engaged in position inside the shaft tube.

Abstract: A knock-type writing instrument is provided, which allows an easy refill exchange with a simple operation while inhibiting deformation of slits, breakage of a shaft tube, etc., during the refill exchange.

Abstract: An end plug mounting structure for writing instrument of the present invention can securely mount an end plug onto a barrel and remove it more easily. Even if assembling and removing is performed repeatedly, tightness for the end plug to be assembled on the barrel can be prevented from weakening. A locking hole is provided around cylindrical rear portion of the barrel, an inserting portion with circular cross section inserted into rear portion of the barrel from rear end of the barrel is provided on the end plug, a locking protrusion locked in a locking hole is provided at periphery of the inserting portion, a groove extending forward from rear end of the barrel and in which the locking protrusion moves is provided on inner surface of rear portion of the barrel, thereby the end plug is assembled on the barrel by means of locking the locking protrusion that moves forward in the groove in the locking hole.

Abstract: An inner barrel is slidably inserted into an outer barrel, chuck pieces which hold a stick-shaped material is provided at a tip end portion of the inner barrel, a chuck ring is inserted between the chuck pieces and the outer barrel, an elastic member receiving part is provided at part of an inner peripheral surface in a circumferential direction of the outer barrel, an elastic member receiving part is provided at part of an outer peripheral surface in the circumferential direction of the inner barrel, and a coil spring is placed at part in a circumferential direction of the outer barrel and the inner barrel between the elastic member receiving part and the elastic member receiving part, and urges the inner barrel with respect to the outer barrel.

Abstract: A liquid supply implement can accommodate a large amount of liquid without being subjected to limitation of a capacity of a temporary storage chamber temporarily storing the liquid overflowing a tank, or can reduce the capacity of the temporary storage chamber. A tank formed inside a rear barrel and accommodating a liquid is divided into a plurality of tank portions. In order that all the tank portions do not communicate with a tip end supply element between the tank and a pen tip, any one of a plurality of through-holes of an inner plug respectively communicating with the respective tank portions is allowed to communicate with one through-hole formed in a lateral wall of a front barrel. By rotating the rear barrel with respect to the front barrel, selected tank portion can be switched.

Abstract: An airtight cap structure is provided, in which the number of parts is not increased, and moreover, a design property can be given, and air-tightness can be secured. A cap is configured by two-color molding of a soft portion comprised of an elastic soft resin, and a hard portion comprised of a hard resin, and in a state in which the cap is attached to a main body, the use end portion is inserted into the elastic soft portion to mare a direct contact to be sealed, and at the same time, the surface of the tip end portion of the main body is brought into contact with the soft portion, thereby securing air-tightness of a refill.