JPH053350Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention has a predetermined length when writing, the tip of the writing part protrudes from the barrel, and shortens when not in use. It relates to a writing instrument that is immersed in a barrel.

(Prior Art) Various types of conventional retractable writing instruments have been devised and commercially available, such as those having a structure in which the tip of the writing part is made to protrude and retract from the barrel by pressing a knob bar.

(Problems to be Solved by the Invention) However, in these devices, the knob stick protrudes from the rear end of the shaft cylinder, and all of these devices are structurally unsightly.

Furthermore, the overall length of the writing instrument itself inevitably becomes long, which is often inconvenient when carried in a pocket or the like.

(Means for Solving the Problems) The present invention solves these drawbacks or inconveniences by providing a collection chuck inside the rear end of the outer shaft and a center core having a tapered portion at the rear end. This problem is solved by slidably inserting an inserted inner cylinder into the outer shaft.

(Function) When writing, by sliding the outer shaft backward, the tip of the writing part protrudes from the front end of the tip tube and becomes ready for writing, and when not in use, by pressing the outer shaft forward, it is possible to write. The tip of the part is housed in the tip tube.

(Example) The drawing shows an embodiment of the retractable writing instrument according to the present invention, and Fig. 1 shows the state when not in use, and shows a collection chuck 1 having a tapered surface 1a that widens toward the tip. A cylinder 3 is fitted to the rear end of the outer shaft 2 fixed to the inner side of the rear end, and an inner cylinder 5 having stepped portions 4 at appropriate positions on the inner wall is fitted so as to be slidable back and forth. When the outer shaft 2 of the cylindrical body 3 is slid rearward, the inner tip 3a of the cylindrical body 3 slides forward on the tapered surface 1a of the collection chuck 1, constricting the collection chuck 1 inward.

The rear end is a tapered part 6 on which the inner tip 1b of the collector chuck 1 slides when the outer shaft 2 slides rearward, and the outer diameter of the rear end of the tapered part 6 is the same as that of the tip when the collector chuck 1 is closed. A center core 8 having a protrusion 7 at the middle part, which is equal to or slightly larger than the inner diameter, is arranged so that the protrusion 7 comes into contact with the front end surface of the stepped part 4 of the inner cylinder 5, and the rear part is fitted into the collect chuck 1. Fitted into the inner cylinder 5, the inner cylinder 5
A tip tube 9 is fitted at the tip of the tube to the protrusion 7 of the core 8 and the rear end surface of the tip tube 9 via a spring 10.

Note that 11 is a tail plug for fixing the collector chuck 1 to the outer shaft 2, and 12 is the tip of the writing section.

When writing, the collector chuck 1 is also moved backward by sliding the outer shaft 2 backward as shown in FIG. It is tightened inward, and the inner tip 1b of the collection chuck 1 slides on the tapered portion 6 of the core 8, pushing the core 8 forward.

Furthermore, when the outer shaft 2 is slid, the rear end surface of the tapered part 6 of the center core 8 is pushed forward than the front end surface of the collection chuck 1. When the sliding of the outer shaft 2 is stopped at this point, the collection chuck 1 is moved into contact with the cylinder body 3. Due to the force of the spring 10, the rear end surface of the tapered portion 6 presses against the front end surface of the collection chuck 1, and the tip 12 of the writing portion of the core 8 protrudes from the tip tube 11, allowing writing. state.

Next, when not in use, when the outer shaft 2 is slid forward, the lock between the collect chuck 1 and the cylindrical body 3 is released, the collect chuck 1 is pushed outward, and the taper part of the collect chuck 1 and the center core 8 is expanded. 6 is disengaged, the core 8 is pushed rearward by the action of the spring 10, and the tip 12 of the writing section sinks into the tip tube 9.

(Effects of the invention) Since the retractable writing instrument according to the invention has the structure as described above, it has an excellent design as the knob etc. do not protrude from the barrel, and it can be carried in a pocket etc. when not in use. The overall size is short, making it easy to carry, and the long size allows for writing.
It's very convenient.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the retractable writing instrument according to the present invention when not in use, and FIG. 2 is a sectional view showing the retractable writing instrument in a writable state. DESCRIPTION OF SYMBOLS 1...Collection chuck, 1a...Tapered surface of the collection chuck, 1b...Inner surface tip of the collection chuck, 2...Outer shaft, 3...Cylinder body, 3a...Inner surface tip of the cylinder body, 4...Step part, 5...Inner side Cylinder, 6...Tapered portion, 7...Protrusion, 8...Center core, 9...Tip tube, 10...Spring.

Claims (1)

[Scope of utility model registration request] A cylindrical body in which a collector chuck having a tapered surface that widens toward the tip is fixed inside the rear end of the outer shaft, and when the outer shaft is slid rearward, the inner tip slides on the tapered surface of the collector chuck and narrows the collector chuck. is fitted into the rear end of the inner cylinder and is slidably inserted into the inner cylinder having stepped portions at appropriate positions on the inner wall, and the tapered part on which the inner tip of the collector chuck slides when the outer shaft slides rearward on the rear end. The outer diameter of the rear end of the tapered part is equal to or slightly larger than the inner diameter of the tip of the collect chuck when it is closed, the center core having a protrusion in the middle part is placed in the inner cylinder, and the rear part is covered in the collect chuck. A retractable writing instrument having a structure in which a tip tube is fitted to the tip of the inner tube via a spring between a protrusion of the center core and a rear end surface of the tip tube.