Abstract: A writing instrument of the present invention has an ink chamber 2 formed inside a main body 1 of the writing instrument, a writing element 5 provided on a front end portion of the main body 1 of the writing instrument, a reservoir chamber 10 which is formed between the ink chamber 2 and the writing element 5 and communicates with the atmosphere and with the writing element 5, a plurality of walls 14 and 14a which partitions the reservoir chamber 10 and the ink chamber 2 and further partitions the ink chamber 10 into a plurality of small chambers in the axis direction, and an ink supply member 16 which penetrates the plurality of walls and supplies ink from the ink chamber 2 to the writing element 5, where each of the walls is provided with a communication hole 15 capable of holding the ink by capillary force, and these communication holes are sealed with an ink membrane.

Abstract: A writing instrument of the present invention has an ink chamber 2 formed inside a main body 1 of the writing instrument, a writing element 5 provided on a front end portion of the main body 1 of the writing instrument, a reservoir chamber 10 which is formed between the ink chamber 2 and the writing element 5 and communicates with the atmosphere and with the writing element 5, a plurality of walls 14 and 14a which partitions the reservoir chamber 10 and the ink chamber 2 and further partitions the ink chamber 10 into a plurality of small chambers in the axis direction, and an ink supply member 16 which penetrates the plurality of walls and supplies ink from the ink chamber 2 to the writing element 5, where each of the walls is provided with a communication hole 15 capable of holding the ink by capillary force, and these communication holes are sealed with an ink membrane.

Abstract: A writing instrument has an accurate operation and simple structure in a mechanism for controlling ink supply by air enclosed in an ink passage, and a method of producing the same. The ink is blocked by the air enclosed in a blocking chamber (11), the blocking chamber communicates with an ink holding passage (18) and has a porous relay body (15) inserted therein, an ink storing portion (17) is formed in a base portion of the relay body, the ink in the ink holding passage (18) descends and contacts the relay body (15) as the ink in the ink storing portion is consumed, and thereby is transferred to the ink storing portion, and the air is prevented from being absorbed into the porous relay body (15).

Abstract: A writing instrument has an accurate operation and simple structure in a mechanism for controlling ink supply by air enclosed in an ink passage, and a method of producing the same. The ink is blocked by the air enclosed in a blocking chamber (11), the blocking chamber communicates with an ink holding passage (18) and has a porous relay body (15) inserted therein, an ink storing portion (17) is formed in a base portion of the relay body, the ink in the ink holding passage (18) descends and contacts the relay body (15) as the ink in the ink storing portion is consumed, and thereby is transferred to the ink storing portion, and the air is prevented from being absorbed into the porous relay body (15).

Abstract: A writing instrument has an ink reservoir, a nib and a feeder which temporarily stores ink which is pushed out of or pulled into the ink reservoir. The ink reservoir communicates with the nib through an ink supplying passage. The feeder chamber communicates with the atmosphere through an atmosphere communicating passage and with the ink reservoir through a capillary flow passage. The cross-sectional area of the capillary flow passage is small enough to hold ink in the capillary flow passage due to a surface tension of the ink. When the pressure in the ink reservoir due to a temperature change, etc., ink flows in the feeder chamber through the capillary flow passage or is returned from the feeder chamber to the ink reservoir. Since the feeder chamber is hollow, its volume is large and has a simple structure, the feeder can be manufactured easily. A low flow resistance of the capillary flow passage provides good response for compensation for a pressure change.

Abstract: A writing instrument has an ink reservoir under pressure. Compressed ink in the ink reservoir is supplied through an ink passage to a ball tip also acting as a valve body. A push rod is inserted in the ink passage and is intended to urge the ball forward. The ball tip is in a closed state when the writing instrument is used and is in an open state when the writing instrument is used for supplying ink. A stirring weight is housed in the ink reservoir. When the writing instrument is swung, the stirring weight is moved to stir ink in the ink reservoir. The stirring weight interferes with the push rod to displace it. The push rod is displaced to stir ink in the ink passage whereby ink containing air and/or air bubbles in the ink passage is removed.

Abstract: An ink reservoir and a slide plug are slidably provided in a pen barrel. The ink reservoir is filled with liquid ink. The slide plug divides the interior of the pen barrel into an ink region and an air region. A writing tip is provided in the distal end portion of the pen barrel so as to be movable axially. An elastically deformable diaphragm member is provided in the pen barrel. The diaphragm member divides the interior of the pen barrel into a writing tip side region and an ink reservoir side region and is elastically deformed toward the ink reservoir when a writing pressure is applied to the writing tip. The diaphragm member is formed with an opening which opens to cause the ink reservoir to communicate with the writing tip when the diaphragm member is elastically deformed. Upon writing, the diaphragm member is elastically deformed to pressurize the ink in the ink reservoir. In this case, the slide plug slides to restrict the upper limit of the ink pressure to a predetermined value.

Abstract: A marker including a cylindrical ink reservoir formed in a body, a slide plug inserted into the ink reservoir, a pen element slidably installed at the end of the body in the axial direction, and an elastic sealing member for pressuring ink and sending it to the pen element. For writing, ink is supplied to the pen element by the elastic sealing member and adequate ink is constantly contained in the pen element.

Abstract: A tool for applying a liquid to a predetermined portion is disclosed. The tool has a main ink reservoir and a sub-ink reservoir. The sub-ink reservoir communicates with a pen body. The main ink reservoir communicates with the sub-ink reservoir through a valve mechanism. When ink inside the sub-ink reservoir is depleted upon writing, and a pressure inside the sub-ink reservoir is reduced, the valve mechanism is opened.

Abstract: A writing instrument of an extremely simple structure in which stored ink previously extruded upon increase of the internal pressure of an ink chamber is subsequently sucked up by decrease of the internal pressure of the ink chamber and returned to the ink chamber, thereby preventing the outputting of ink drops in a downward orientation of pen, particularly when a large amount of ink is stored.

Abstract: Disclosed is a writing element for use in a ball point pen comprising a ball seat member which supports a ball on a ball seat disposed at its tip end and an outer sleeve which is fitted over the ball seat member to keep the ball on the ball seat. Said outer sleeve is slidably fitted to the ball seat member so as to be frictionally engaged with the ball seat member to be slid rearwardly by the extent to which the ball seat has been worn due to the writing pressure acting on the sleeve.

Abstract: A socket for a ball point pen comprises a hollow sleeve receiving a writing ball at the forward end, a rod member forcefully inserted into the sleeve to be pressed at the forward end against the writing ball, and ink passageways defined between the sleeve and rod member so as to extend throughout the socket. The sleeve is provided with a communication section for causing the ink passageways to communicate with the outside of the socket, thereby attaining a reliable delivery of ink from the ink passageways to the writing ball and preventing ink from leaking out of the pen body through an air passage provided at the forward end portion of the barrel of the ball point pen.