JPS5845110Y2 - Lead return ring for Knotsuku style pencil - Google Patents

Description

[Detailed explanation of the invention] Conventional knock-type mechanical pencils are constructed in such a way that the lead is fed out unilaterally when the knock is pressed repeatedly, and to return the lead, the lead must be kept pressed while the knock is pressed. Previously, the lead was pressed against a desk or the like, or pushed in with the tip of a finger, but recently a knock-type mechanical pencil was devised that allows the lead to be advanced and returned by the push of a knock.

As shown in FIGS. 3 and 4, the design is a ring in which the lead delivery chuck 2 is fitted into the part inside the mouthpiece 1 where the lead delivery chuck 2 is pushed out to the maximum extent by the knock 3. Then, a ring 5 having a tapered inner wall 4 whose diameter narrows toward the tip is fitted, and the operation of pushing and releasing the dowel 3 shallowly to the extent that the chuck 2 does not fit into the ring 5 is repeated. , the lead 6 is fed out, and the operation of pushing the dowel 3 deeply so that the chuck 2 fits into the ring 5 and releasing it is repeated, but the chuck 2 is tightened by the inner wall of the ring 5 and holds the fed out lead 6 in its grip. The structure is such that the lead 6 is returned.

In this knock-type mechanical pencil, when the cap 1 is removed, the ring 5 separates from the interior of the cap 1 and comes out attached to the lead, as shown in Figure 4, but the inner diameter of the ring 5 is the diameter of the lead 6. Since the ring 5 is molded larger than the ring 5, it easily slips off the core 6, and if it falls, the ring 5 is small and is often lost.

The present invention aims to provide a re-core ring for a knock-type mechanical pencil that can overcome these drawbacks.

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 of the drawings. 1 is a base, 2 is a main body of a mechanical pencil, 3 is a knock, 4 is a lead delivery chuck pushed out by the knock 3, 5 is the core delivery chuck 4 inside the mouthpiece 1.
This is a metal ring that is inserted into the point where the lead is pushed out to the maximum extent by the knock 3, and the rear end is provided with an opening 6 having a diameter into which the tip of the lead delivery chuck 4 can be inserted. A tapered inner wall 7 is provided whose diameter narrows from 6 to the tip side of the ring 5, and a rubber packing 9 having a through hole through which the core 8 is inserted while sliding is attached to the opening on the tip side. Destroy.

Reference numeral 10 denotes a rubber stopper ring attached to the inside of the cap 1 near the tip, and is pressed against the core 8 a little more strongly than the rubber gasket 9.

Since the present invention is constructed as described above, it is possible to feed out the lead and return the sent out lead by pressing the knock, and when the cap is removed from the main body, the ring causes friction against the core of the gasket. Since it is attached to the core without slipping due to resistance, it has the advantage of preventing loss.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view of the main parts of a knock-type mechanical pencil equipped with a core return ring according to the present invention, and Figure 2 is a cross-sectional side view of the main parts of the same mechanical pencil with the cap removed. 3 is a cross-sectional side view of the main part of a conventional knock-type mechanical pencil, and FIG. 4 is a cross-sectional side view of the main part of the same mechanical pencil with the cap removed. 1...Base, 2...Mechanical pencil body, 3...Knock, 4...Lead feeding chuck, 5...Ring, 6 ... Rear end opening, 7 ... Tapered inner wall, 8 ... Core, 9 ... Rubber packing, 10 ... Stopper ring.

Claims (1)

[Scope of utility model registration request] A ring that is inserted into the mouth of a knock-type mechanical pencil at a point that is pushed out to the maximum extent by the lead delivery chuck or knock, and has an opening at its rear end that has a diameter that allows the tip of the lead delivery chuck to fit into it. A tapered inner wall is provided so that the diameter narrows from the opening to the tip of the ring, and a gasket is attached to the opening on the tip side, which has a through hole through which the core slides and is inserted. A refill ring for a retractable mechanical pencil.