A retractable pen with a push button includes a top plug, a barrel and a bottom holder. The top plug is partially insertable into the barrel and is axially movable with respect to the barrel, and the bottom holder is in threaded connection with the barrel. A refill is arranged in the top plug, the barrel and the bottom holder. A reset spring is arranged between the refill and the bottom holder. An end of the push button located in the barrel is provided with at least one clamping member configured to clamp the barrel and a push member configured to drive the top plug to axially slide with respect to the barrel. At least one limit piece is fixedly provided on an inner wall of the barrel to hold the clamping member.

An applicator includes a closure cap including inner retaining members; an application head including a housing, a support, and a coupling member wherein the housing includes an axial channel with the support substantially disposed therein, an inclined surface having an application face and holes, and roller-balls disposed in the holes respectively; the support includes a stair adjacent to the holes, and the coupling member includes a neck member at a first end and being urged against the support, an internally threaded member adjacent to a second end and disposed through the neck member, a mating retaining member disposed on an outer surface of the neck member between the inclined surface and the internally threaded member, the mating retaining member being secured to the retaining members; and a container assembly including an externally threaded neck at one end and threadedly secured to the internally threaded member.

A hand tool includes an outer barrel, an inner barrel housed in the outer barrel, and a rear barrel assembled to the outer barrel and the inner barrel. One of the outer barrel and the inner barrel includes a cam follower protruding in a radial direction of the hand tool, the other of the outer barrel and the inner barrel includes a cam groove engaging with the cam follower, and the cam follower is supported to be movable in a radial direction.

A method of coextruding polymeric materials into multiple layers of desired thickness to form a tubular workpiece. The method includes conveying a first polymeric material through a main extruder and a second polymeric material through a coextruder. The second polymeric material has dispersed therein an amount of electrically conductive particles effective to impart electrical conductivity to the tubular workpiece. The method further includes simultaneously extruding the first polymeric material and the second polymeric material through a coextrusion die to form the tubular workpiece. The tubular workpiece is extruded in the form of one or more outer layers having the first polymeric material and one or more inner layers comprising the second polymeric material. A tubular workpiece prepared by the method of coextruding polymeric materials into multiple layers of desired thickness. A system for coextruding polymeric materials into multiple layers of desired thickness to form a tubular workpiece is also provided.

An oil-based ink composition for a writing instrument, comprising a dye, an organic solvent and a phenolic compound of the following general formula (1): ##STR00001##
wherein R is each independently hydrogen or an alkyl group having 1 to 5 carbon atoms, R.sub.1 is any of an alkyl group having 1 to 5 carbon atoms, a halogenated alkyl group having 1 to 5 carbon atoms, a phenyl group, a hydroxyphenyl group, and an alkyl group having 1 to 5 carbon atoms substituted by a hydroxyphenyl group, and R.sub.2 is any of a halogenated alkyl group having 1 to 5 carbon atoms, a phenyl group, a hydroxyphenyl group, and an alkyl group having 1 to 5 carbon atoms substituted by a hydroxyphenyl group. The oil-based ink composition for a writing instrument can form handwriting having excellent water resistance in which no bleeding occurs on written surfaces of various materials with a dye retaining color development.

An oil-based ink composition for a writing instrument, comprising a dye, an organic solvent and a phenolic compound of the following general formula (1): ##STR00001##
wherein R is each independently hydrogen or an alkyl group having 1 to 5 carbon atoms, R.sub.1 is any of an alkyl group having 1 to 5 carbon atoms, a halogenated alkyl group having 1 to 5 carbon atoms, a phenyl group, a hydroxyphenyl group, and an alkyl group having 1 to 5 carbon atoms substituted by a hydroxyphenyl group, and R.sub.2 is any of a halogenated alkyl group having 1 to 5 carbon atoms, a phenyl group, a hydroxyphenyl group, and an alkyl group having 1 to 5 carbon atoms substituted by a hydroxyphenyl group. The oil-based ink composition for a writing instrument can form handwriting having excellent water resistance in which no bleeding occurs on written surfaces of various materials with a dye retaining color development.

A system for regulating application of solution to a user, includes a rollerball; a body, including a first end and a reservoir disposed at a second end of the body; a fitment, including a well and a solution regulator; and a piston, wherein the fitment is configured to hold the rollerball; the rollerball is substantially spherical and rotatable in the fitment; the first end of the body is configured to hold the fitment; the reservoir is configured to hold a solution; the piston is inserted into the reservoir at the second end of the body; and the well is configured to receive a predetermined volume of the solution from the reservoir.

A method for manufacturing a ball pen tip, in which a spring for biasing a ball is assembled to the ball pen tip, includes punching the ball pen tip by a punch from a rear end of the ball pen tip along a central axis direction of the ball pen tip to form a plastic flow ridge formed by plastic flow upheaving radially inward from an inner peripheral wall surface of the ball pen tip to assemble the spring to the ball pen tip by the plastic flow ridge.

A method for manufacturing a ball pen tip, in which a spring for biasing a ball is assembled to the ball pen tip, includes punching the ball pen tip by a punch from a rear end of the ball pen tip along a central axis direction of the ball pen tip to form a plastic flow ridge formed by plastic flow upheaving radially inward from an inner peripheral wall surface of the ball pen tip to assemble the spring to the ball pen tip by the plastic flow ridge.

The present invention discloses a using method of a rewritable board. It comprises applying or removing a fluid on the rewritable board for writing repeatedly, wherein the rewritable board is an aluminum based material sequentially having a porous aluminum oxide layer and a metal layer thereon, and wherein the porous aluminum oxide layer has a porosity ranging from 10% to 80%.