Abstract: A rotary latch release mechanism includes axially-aligned upper and lower rotary latch components carried on and rotationally coupled to upper and lower latch assemblies, respectively. The latch release mechanism is movable from an axially-latched position to an axially-unlatched position in response to relative rotation between the upper and lower rotary latch components. The latch release mechanism has a movable land surface that acts in response to relative axial displacement, to induce the relative rotation required to release the latch. The latch release mechanism may be configured such that the axial movement of the movable land surface will cause the relative axial movement required to release the latch in combination with the required rotation. Accordingly, the rotary latch mechanism operates in response to externally-controlled axial movement of a movable land surface carried by the latch release mechanism, without requiring externally-induced rotation.

Abstract: A compact ballpoint pen in which a bar of a push button is split into left and right bars and thus an ink cartridge can be inserted into a space between the split bars. Thus, the length of a ballpoint pen is reduced.

Abstract: A slide body (6) is arranged in a cut-away portion of a holder (1) under a clip (2a) so as to not hinder writing or portability, and a safety mechanism is constituted so as to be engaged with the clip (2a). Due to functions of a knock rod cam (4a) of a knock rod (4) and a knock cam (3a) of a rotor (3), further, the rotor (3) is rotated and moved forward responsive to each knocking operation, a refill (7) is brought to a writing position and a holding position alternately responsive to each knocking operation due to a cam mechanism provided in the inner wall of an inner cylinder (2) and a reactive force of a spring (5). A slide body cam (6a) provided on the slide body (6) is incorporated in a portion of the cam mechanism so that the knock type writing instrument thrusts the pen point out, by one knock even after the safety operation.

Abstract: A writing instrument that includes a barrel, which includes a window in the side of the barrel, a movable writing tip, a moving member that is connected to the tip, and a side button designed to collaborate with the moving member. The moving member can be moved through the window between a first position, where the tip is retracted and the second position, where the tip is exposed.

Abstract: The object of this invention is to provide a safety knock-type writing instrument. The writing instrument includes a barrel (10) with a cartridge (50), a gear unit (30), and a knock unit (60). The gear unit (30) is positioned on an exterior of the barrel (10) and rotatably seated on a clip (20). The knock unit (60) is provided in the barrel (10), and includes first and second protrusions (61, 62) to engage with the gear unit (30), thus operating the gear unit. In this writing instrument, when the first protrusion (61) of the knock unit disengages from the gear unit (30), the cartridge is retracted into the barrel. Thus, although a user puts the writing instrument, with the cartridge extended, in a pocket without first retracting the cartridge, the cartridge is automatically retracted into the barrel, thus preventing his/her clothing from being stained by the cartridge.

Abstract: A retractile mechanism for refills of writing instrument includes an outer tube, a refill, an inner tube, and a compression spring. When a pen nib is thrown forth, an inner tube with load pushes the refill moving forwards by inertia; while a projecting edge on the inner tube passes through a button hole of the outer tube, an elastic button inserts through the button hole, presses and locks with the projecting edge; the inner tube and the extended nib point are ready for writing; when the elastic button is pulled out, both the inner tube and the refill retracts by the pushing of the compression spring, back to the storage status.

Abstract: A ballpoint pen with extensible closing top structured to include a spring pen top, a handhold, an extensible pen body, a cap and a pen refill, wherein the extensible pen body embodies a two-stage configuration. Furthermore, a butt pin is configured interior of the cap, which penetrates interior of the extensible pen body and the handhold, and butts against a rear end of the spring pen top. When not in usage, a front section of the spring pen top covers the internal pen refill, and thus the pen refill is not exposed, whereas directly pulling backward on the extensible pen body thereby exposes the pen refill. Usage of the ballpoint pen is thus made considerably convenient.

Abstract: A retractile pen has an outer barrel, an inner barrel movably located in the outer barrel, and a clip connected to a rear end of the outer barrel. The inner barrel has a retaining bolt elastically connected to a rear end thereof. A first and a second guide slot are correspondingly provided on the clip and the outer barrel. A push button is connected to the retaining bolt via a connecting bar downward extended from an expanded head straddling the first guide slot. When the push button is depressed and slid along the first guide slot, the inner barrel is moved to expose or retract a writing tip thereof from or into the outer barrel. When the writing tip is exposed, the push button locks a front end of the clip to remind a user of the exposed writing tip to avoid an ink-spotted pocket.

Abstract: A retractile pen includes axially slidably connected front and rear casings, an internal sleeve slidably mounted in the rear casing to hold an ink cartridge having a front portion extended into the front casing, and an adjusting button located above a guide slot provided on the rear casing to connect with the internal sleeve via a stem portion extended from the adjusting button through the guide slot. When the adjusting button is depressed and moved to a rear or a front end of the guide slot, the internal sleeve is held in place to retract or extend the ink cartridge, respectively, and the rear casing may be pushed toward or away from the front casing to shorten or increase an overall length of the pen.

Abstract: A clicking-type ball point pen has a so-called double-clicking mechanism in which a clicking rod is projected by depression and is retracted by further depression. At least one undercut is formed in the inner surface of a rear barrel cylinder or a component fixed to the rear barrel cylinder to prevent a rotor and the clicking rod from being removed forward from the barrel cylinder. The barrel cylinder incorporates a writing element having a large diameter. A point assembly holder at the distal end of the barrel cylinder has a straight portion, which constantly urges a writing ball forward with a load of 1 g to 80 g, and an elastic portion having spring properties integrally, or in a contact state if the straight portion and the elastic portion are separate components. An ink present from the interior of the point assembly to a follower is defoamed such that a gas, e.g., air, water vapor, or a gas formed of a vaporized organic solvent, which is larger than 0.524 mm.sup.

Abstract: The multiplex writing implement includes: a cylindrical portion formed in the rear of the elliptical cylinder portion of the middle barrel; a rotary shaft which is disposed in the bore of the cylindrical portion so as to rotate in a range of about 180.degree.

Abstract: A writing instrument is provided which includes a body having a barrel portion and a plunger portion. The barrel portion has opposed front and rear ends for housing a replaceable writing cartridge and a spring for biasing the cartridge toward the rear end of the barrel portion. The plunger portion is removably maintained in the rear end of the barrel portion and is configured for moving the cartridge between a retracted portion and a protracted position and for rotational and axial movement with respect to the center line of the barrel portion for removing the plunger portion to replace the cartridge. A clip member is pivotably mounted to the body of the writing instrument and includes a latch for selectively engaging the body of the writing instrument when the cartridge is in a protracted position.

Abstract: A writing instrument is provided which includes a body having a barrel portion and a plunger portion. The barrel portion has opposed front and rear ends for housing a replaceable writing cartridge and a spring for biasing the cartridge toward the rear end of the barrel portion. The plunger portion is removably maintained in the rear end of the barrel portion and is configured for moving the cartridge between a retracted portion and a protracted position and for rotational and axial movement with respect to the center line of the barrel portion for removing the plunger portion to replace the cartridge. A clip member is pivotably mounted to the body of the writing instrument and includes a latch for selectively engaging the body of the writing instrument when the cartridge is in a protracted position.

Abstract: A portable electronic calculator which has incorporated therein a writing instrument. A miniature electronic calculator is built in a rectangular, elongated body. A cover made of metal covers a control panel for the electronic calculator and a display part, and the cover is mounted on the body to be removable therefrom by sliding the cover in the lengthwise direction of the body. The side marginal portions of the cover are bent inwardly for engagement with both side surfaces of the body to reinforce the body when the cover has been mounted thereon.

Abstract: An ink pen is provided which is comprised of an outer rotating and sliding body which fits comfortably, overriding an inner ink containing cartridge. The outer body slides with respect to the inner cartridge when rotated with respect thereto. Rotation of the outer body with respect to the inner cartridge causes the cartridge to retract within the outer body, thus protecting the pocket of an individual upon placement of the pen in such a position when the pen is not in use. Inadvertent placement of the ink pen into a shirt pocket, for example, when the pen is in the writing position, is prevented by means of a projecting clip guard which catches on the outer portion of the pocket, thus preventing the pen from entry into the pocket when it is in its writing position.