JPH11309983A - Lead feeding mechanism for mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply to a writing instrument internally mounting a plurality of writing means by preventing an oscillation or breakage of a lead according to a writing pressure at the time of writing and accurately using the lead without waste. SOLUTION: The lead feeding mechanism 6 for a mechanical pencil contained in a writing instrument comprises a tip end 10 having a tip end chuck 10 and a tip end chucking ring 19 in such a manner that they are integrally coupled by a tip fitment 18. Thus, a tip end 7 of the mechanism 6 is projectable from or retractable in an opening 20 of barrel by knocking a knock part. It can be accurately operated without breakage or clogging of the lead. Further, other writing means such as, for example, a ballpoint pen can be contained together in the writing instrument.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead delivery mechanism for a mechanical pencil.

[0002]

2. Description of the Related Art Conventionally, a lead sending mechanism used in a mechanical pencil has a lead housed in the mechanical pencil protruding from the tip of the mechanical pencil, and also prevents the lead from being broken or jammed at the tip, and securely holds the lead. In order to be able to move forward and widen by hitting a knocking part projecting from the rear of the barrel into the barrel constituting the mechanical pencil, it retreats again by the elasticity of the spring, and the tip ends at the barrel opening. There is a so-called double knock mechanism that uses a tip chuck tightened by a chuck ring and moves the core housed in a core housing portion inside the barrel while moving the core forward (Japanese Utility Model Laid-Open No. 7-15383; See Japanese Unexamined Patent Publication No. Hei 7-228088).

[0003]

However, as in the prior art, a knocking portion protruding from the rear of the barrel is struck into the interior of the barrel constituting the mechanical pencil, thereby advancing and expanding. In the case of the above-mentioned double knock mechanism using the tip chuck that retreats again due to the elasticity of the spring and is tightened by the tip chuck ring at the opening of the barrel, the feeding and gripping of the lead is surely performed by the feeding chuck and the tip. By using two of the chucks, the lead is securely held by these chucks, and even when a large pressure is applied to the tip of the lead during writing or the like, the lead is greatly bent and swings, and accurate writing is performed. Can be performed or the lead can be broken.In addition, the tip chuck at the tip of the mechanical pencil is sent from the feeding chuck. Since it is intended to grip the core,
Although the core that has been shortened to some extent naturally falls and it has to be discarded, it can prevent large waste,
The opening of the tip chuck, which is arranged at the tip of the mechanical pencil, and the opening of the barrel to be tightened are integrally formed with the barrel, so that, for example, a ballpoint pen and a mechanical pencil can be placed in one writing instrument. There is a problem that a writing instrument having a plurality of writing means cannot be used.

Accordingly, the present invention is to solve the above-mentioned problems of the prior art, and it is possible to prevent the writing of the lead and the waste of the lead while reliably preventing the writing and the break of the lead by securely holding the lead. The mechanical pencil provided with this lead-out mechanism can be applied in combination with various writing instruments.

[0005]

A feeder slides in a tightening ring attached to the end of a joint, and is sent out by a lead chuck composed of a lead chuck integrally connected to a lead receiving part which is tightened and expanded by the tightening ring. In the mechanism, the delivery unit is connected to a tip chuck ring that comes into contact with the shaft cylinder opening from the inside via a spring, and a tip chuck that is fixed to the tip of the tip fitting from the inside of the tip chuck ring protrudes. It is.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In practicing the present invention, the rear end of a mechanical pencil is hit against a knocking portion,
The core sent out from the sending portion toward the tip portion is gripped while being advanced by the tip chuck at the tip portion so as to protrude outside the barrel, and is gripped by both the chuck at the sending portion and the chuck at the tip portion. The core can be accurately bent without swinging due to large deflection, and can be prevented from being broken. In addition, the core is always gripped by the tip chuck at the tip, so that the entire length of the core is Even if the length becomes short, writing can be performed without waste.

[0007] Further, a tip chuck which constitutes a tip portion for gripping a core projecting from the tip of the barrel, and a tip chuck ring which is integrated with the tip chuck and controls the tightening and expansion of the tip chuck are disclosed. Since it is possible to appear and disappear independently of the barrel and integrally, a plurality of writing means, for example, in a writing instrument equipped with a ballpoint pen in addition to a mechanical pencil, this mechanical pencil is housed inside instead of the mechanical pencil. Can be used

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. (1) is a writing instrument provided with a mechanical pencil having a lead sending mechanism according to the present invention. The writing instrument (1) is housed in a shaft cylinder (2) and the shaft cylinder (2) so as to be freely retractable. By hitting a knocking part (3) protruding from the rear end of the cylinder (2), a mechanical pencil (5) protruding and retracting from the tip of the barrel (2) and a mechanical pencil (5) by sliding an extrusion button. ) Is replaced with a ballpoint pen (4) that appears and disappears.

The lead-out mechanism (6) of the mechanical pencil (5) to be housed in the barrel (2) together with the ball-point pen (4) has its tip freely movable into and out of the barrel (2). And a knock (3) housed in the barrel (2) and protruding from the rear end of the barrel (2) to strike the tip (7) into the tip (7). )
The tip portion (7) slides in a tip chuck ring (9) that comes into contact with the shaft cylinder opening (20) from the inside, and the tip chuck ring is formed. (9) and a tip chuck (10) that is tightened and expanded by abutment of the barrel opening (20), while the delivery portion (11) is provided with a joint (1) as in the conventional structure.
The slide ring (13), which is attached to the tip of (2) and slides back and forth for a predetermined distance, slides, and the tip is tightened or expanded by the tightening ring (13). Further, a lead chuck (14) is integrally provided with the lead receiving portion (16) by a chuck joint (15) (FIG. 2).
reference).

Further, as described above, the tip portion (7) and the sending portion (11) constituting the mechanical pencil (5) are
A spring (17) (slightly less elastic than the spring that reciprocates the lead chuck) is interposed between the tip (7) and the delivery part (11), and has a holding portion that tapers toward the tip. The rubber chuck (19) is integrated via a metal fitting (18) which is provided inside, and the core chuck (1) is pressed by knocking on a knocking part (3) projecting from the rear end of the barrel (2).
Core (8) pinched by 4) and sent forward
The rubber tip (19) which is provided inside the metal fitting (18)
The tip chuck (10), which guides the tip (7) into the tip (7) and guides the tip (7) into the tip (7), comprises the tip (7) together with the tip chuck ring (9). Accordingly, the shaft cylinder (2) is made to protrude into and out of the shaft cylinder through the shaft cylinder opening (20).

Since the writing instrument (1) according to the embodiment of the present invention has the above configuration, the mechanical pencil (5) accommodated in the barrel (2) constituting the writing instrument (1).
First, the mechanical pencil (5) is projected and held outside by hitting a knock portion (3) projecting from the rear end of the barrel (2). At this time, the tip chuck ring (9) of the tip part (7) constituting the lead sending mechanism (6) in the mechanical pencil (5) slides inside thereof to tighten and expand the tip chuck (10). It protrudes from the tube opening (20) and is held.

A tip chuck ring (9) of a tip (7) constituting a lead sending mechanism (6) of a mechanical pencil (5) housed in the barrel (2) as described above, and
The rear end of the barrel (2) is further held in a state in which the tip chuck (10), which slides inside and tightens and expands, projects from the barrel barrel opening (20) at the tip of the barrel (2) and is held. By hitting the knock portion (3) projecting from the portion, first, the lead chuck (14) of the delivery portion (11) constituting the lead delivery mechanism (6) of the mechanical pencil (5) of the writing instrument (1). Slides inside the tightening ring (13), and moves from the lead accommodating portion (16) containing the lead (8) toward the tip (7), which also constitutes the lead sending mechanism (6). The core (8) is gripped while moving forward, and the knock part (3)
The core (8) delivered from the delivery portion (11) toward the tip (7) is prevented from moving forward by the tip chuck ring (9), and the tip chuck (10) is hit. Is loosened, and is advanced so as to protrude outside the barrel (2), and then is pulled into the barrel (2) by a spring and the tip chuck (10) is centered by the tip chuck ring (9). (8), so that both chucks (1) of the sending section (11) and the tip section (7) are held.
4) The core (8) to be gripped by (10) is
Even when a large writing pressure is applied at the time of writing, accurate writing can be performed without greatly bending and swinging, and breakage of the core (8) due to an excessive load can be prevented, and the writing implement (1) The core (8) is always gripped by the tip chuck (10) of the tip (7) protruding from the barrel barrel opening (20) of the barrel (2). Even if it becomes shorter, it is possible to write reliably without waste.

Further, in the writing instrument, the mechanical pencil (5) constitutes a lead sending mechanism (6) of the mechanical pencil (5), and holds a lead (8) protruding from the tip of the barrel (2). The tip chuck (10) constituting the tip portion (7) and a ring (9) for the tip chuck which is integrated with the tip chuck (10) and controls the tightening and expansion of the tip chuck (10) are composed of a shaft cylinder (2). ) When you appear inside and outside,
Since there is no structural relationship with the barrel (2) and the barrel (2) protrudes and retracts from the barrel opening (20), a plurality of writing means such as the writing tool (1) according to the embodiment of the present invention, for example, In addition to the mechanical pencil (5), the ball-point pen (4) can be easily used for a writing implement (1).

[0014]

As described above, since the present invention is constructed, even if a large writing pressure is applied to this core, the core is greatly bent and oscillates, so that accurate writing cannot be performed or breakage occurs. The tip is always gripped by the tip chuck at the tip so that the tip can be used accurately and without waste. Since the inward and outward positions appear, the present invention has an excellent effect that can be applied to a case where a plurality of writing means, that is, a ballpoint pen and the like in addition to a mechanical pencil are accommodated in a writing instrument.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a writing instrument according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Writing implement 2 Shaft cylinder 3 Knock part 4 Ballpoint pen 5 Mechanical pencil 6 Core sending mechanism 7 Tip part 8 Core 9 Tip chuck ring 10 Tip chuck 11 Sending part 12 Joint 13 Tightening ring 14 Core chuck 15 Chuck joint 16 Core receiving part 17 Spring 18 Tip fitting 19 Rubber tip 20 Shaft barrel opening

Claims (1)

[Claims] 1. A delivery part slides in a tightening ring attached to a tip of a joint, and tightens by this tightening ring.
In a lead sending mechanism including a lead chuck integrally connected to a lead receiving part to be expanded, the sending part is connected to a tip chuck ring abutting from the inside to a barrel opening through a spring via a spring. A lead sending mechanism for a mechanical pencil that protrudes a tip chuck that is fixed to the tip of the tip fitting from inside the tip chuck ring.