Abstract: A nozzle 33 is formed on a distal end side of a cylinder 3. The nozzle 33 has an intermediate portion 3b formed such that a tip 7 is freely attachable thereto and detachable therefrom. The intermediate portion 3b of the nozzle 33 is formed with an annular projection 3e for retaining the tip 7. The tip 7 has a thick portion 7a provided in a root portion thereof and formed larger in diameter than a root portion 3a of the nozzle 33 to be abuttable against a tip releasing member 11. Along an inner periphery of the root portion of the tip 7, an annular projection 7b is formed to contact with the annular projection 3e of the nozzle 33 thereby providing a seal with the nozzle 33. Both the annular projections 3e and 7b of the nozzle 33 and the tip 7 are arranged to reach a position where a sound of abutment is produced between the root end surface of the tip 7 and the shoulder of the nozzle 33 at the completion of fitting of the tip 7 onto the nozzle 33.

Abstract: There are provided an aqueous ballpoint pen refill which can produce tasteful writings or drawings with a plurality of colors and which gives an attractive impression, since the inks in the ink reservoir constitute an interesting pattern and also a process for producing the same. A plurality of aqueous inks Ia and Ib with different colors are charged into an ink reservoir having a point tip at the front end to form a vertical or horizontal layered structure or a spiral structure; the aqueous inks containing pigments as coloring agents respectively and each having a viscosity of 45 mPa.multidot.S or more; the specific gravity difference of the inks being not more than 0.05. Injection needles connected respectively to front ends of a plurality of ink tanks are inserted to the transparent ink reservoir, and the plurality of inks with different colors are injected while the injection needles are drawn out of the ink reservoir.

Abstract: A cylinder 3 in a casing 2 is provided with a first suction chamber 34 and a nozzle part 33 having a suction passage 3d in communication with the first suction chamber 34. In the casing 2. a first piston 4 which is slidably inserted into the first suction chamber 34 and includes a second suction chamber 43 is provided with pushed in a direction of protruding from the first suction chamber 34. Further, in the casing 2, a second piston 5 slidably inserted into the second suction chamber 43 is provided with pushed with less resiliency than with respect to the first piston 4 in a direction of protruding from the second suction chamber 43. At the top part of the casing 2, an operating lever 6 is provided for operating the first and second pistons 4 and 5 to switch between a small suction position that the second piston 5 is embedded in the first piston 4 and a large suction position that the first and second pistons 4 and 5 are embedded in the cylinder 3 and the first piston 4, respectively.

Abstract: An applicator in which the air within an inner barrel of a cap to the applicator is enabled to flow readily into the fluid tank of the applicator to increase the internal pressure of the fluid tank when the cap is engaged with the neck of the applicator, so that the fluid tank of the applicator need not be pressed between the fingers of a user for application of a highly viscous fluid. The inner barrel of the cap includes a curved, elastically deformable valve-opening member made of a highly flexible material bearing against the closed end of the cap. When the cap is engaged with the body of the applicator, the valve-opening member abuts against an application member to retract the application member from a caulked front edge of the tip of the applicator so as to form a clearance between the application member and the caulked front edge of the tip through which air can readily flow to increase the internal pressure of the fluid tank.

Abstract: An inexpensive applicator in which the air within the inner barrel of a cap enters the fluid tank of the applicator to increase the internal pressure thereof in the process where the cap is engaged with the neck of the applicator, so that the fluid tank need not be pressed between the fingers for application of the fluid to be applied, the cap having in the inner barrel thereof a cylindrical valve member made of a highly flexible material and provided with a diaphragm or with a diaphragm having a ball-like portion formed thereon, and the application member being designed to be retracted and spaced from the caulked front edge of the tip when the application member is abutted against the diaphragm or the ball-like portion of the valve member in the process where the cap is engaged with the body of the applicator, whereas the elastically deformed diaphragm or the ball-like portion of the valve member is designed to close the front end opening of the tip when the cap is fully engaged with the neck.

Abstract: A fluid applicator in which the internal pressure of a fluid tank can selectively be increased, and the fluid to be applied is prevented from being discharged excessively during application. A cap is provided with a short first inner barrel and a long second inner barrel, so that, when the neck of the applicator is inserted into the short first inner barrel to seal the tip, the pressure rise in the first inner barrel is adapted to be small so as not to substantially increase the internal pressure of the fluid tank, whereas when the neck is inserted into the long second inner barrel, the pressure rise in the second inner barrel is adapted to be great so as to increase the internal pressure of the fluid tank. Alternatively, the applicator may be provided with a pressurizing device having a plurality of sealing barrels of different lengths.

Abstract: Disclosed is an applicator in which the air within the inner barrel of a cap is designed to enter into the fluid tank of the applicator to increase the internal pressure of the fluid tank in the process that the cap is engaged with the body of the applicator, so that the fluid tank need not be pressed between the fingers for application of the fluid to be applied. The cap has a valve member provided with a pushing piece disposed in the inner barrel thereof, and the application ball is designed to retract from the caulked front edge of the tip when the application ball is abutted against the pushing piece of the valve member in the process that the cap is engaged with the body of the applicator, whereas the application ball is designed to disengage from the pushing piece of the tip and resume contact with the caulked front edge of the tip when the cap is fully engaged with the body of the applicator.

Abstract: An applicator which allows easy control of fluid discharge and also smooth application of the fluid contained therein with no excessive discharge includes a fluid tank, filled with a fluid to be applied, and connected to a stem retaining a ball therein, the ball being rotatably retained in a ball housing formed in the stem in such a way that the ball may partly appear from the tip of the stem and is pushed outward by the outer end face of a movable piece, protruding slightly into the ball housing, resiliently urged by a spring, so as to allow the ball to be normally in contact with the inner caulked edge of the stem, while the ball is also designed to roll in contact with the seat of the ball housing when the fluid is being applied.

Abstract: A mechanical pencil with a chuck made of plastics includes a lead case connected with the chuck, a ring arranged to surround and hold the chuck, and a spring for biasing the chuck toward a position where it is engaged with the ring, all of which are disposed within a tubular housing. The plastic chuck includes a cylindrical tube connected with the lead case and three elastically deformable extensions integral therewith. Each of these extensions has an engaging portion for grasping a lead and a connecting portion whose inner surface axially forms a curve of secondary degree extending from the cylindrical tube and expanding radially toward the engaging portion in its free state, so that the engaging portion aligns with the lead when it is engaged with the ring. Accordingly, a grasping force is uniformly applied around the lead.

Abstract: A method for producing a nondirectional pen includes the steps of drawing a metal pipe to form a pen blank having three or more radial blade sections extending along the length of the pen blank and equally spaced angularly away from one another, each of the radial blade sections including an internal gap extending along the length of that blade section; cutting the pen blank into pen bodies having a predetermined length; shaping the forward end of each of the pen bodies into a substantially conical configuration; slotting the pen body from its tip to form longitudinal slots each aligning with the internal gap of the corresponding radial blade section; and providing a hard pen point capable of writing.

Abstract: A method for producing a nondirectional pen includes the steps of drawing a solid metal rod to form a pen blank having three or more radial blade sections extending along the length of the pen blank and equally spaced angularly away from one another; cutting the pen blank into pen bodies having a predetermined length; shaping the forward end of each of the pen bodies into a substantially conical configuration; welding a pen point ball to the tip of the pen body; slotting the pen body from its tip to a predetermined depth through the pen point ball to form longitudinal slots; and plastically deforming the pen body to close the slots.

Abstract: An injection molding machine includes a molding removal mechanism including a double-acting, fluid-operated cylinder which has a chuck mounted thereon for grasping a molded part, said cylinder being rapidly operated for removing the molded part from the mold and slowly actuated for transferring the molded part to a discharge position.

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.

Abstract: A socket for holding the writing ball of a ball point pen comprising an outer tubular member having a circular cross section and an inner tubular member having an elliptic or circular cross section, wherein an ink-conducting chamber or chambers are defined between the inner peripheral wall of the outer tubular member and the outer peripheral wall of the inner tubular member, thereby enabling ink to be conducted smoothly from an ink cartridge provided in the ball point pen through the chambers to the writing ball.