JPH065915Y2 - Writing body appearance / disappearance mechanism in notch type writing instruments - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a writing body retracting mechanism in a knock-type writing instrument, and is related to a retracting mechanism that considers sliding and engagement / disengagement of the locking projection. Regarding improvement.

"Problems to be solved by the prior art and the present proposal" It is widely known that there is a writing body retracting mechanism in a knock-type writing instrument, but the pushing member protruding toward the rear end opening side of the barrel is pressed. Therefore, the writing brush writing end is generally exposed from the front end opening of the barrel, and the protruding and retracting of the writing end is a protrusion for locking that is elastically outward from the center of the barrel formed on the pressing member. Many of them are engaged with and disengaged from through holes provided in the front and rear of the boundary portion of the shaft cylinder. In this case, in order to immerse the exposed writing end portion, the writing body cannot be put into the immersing state unless the locking projection is pushed inward of the barrel until it is disengaged from the engaging through hole. Therefore, a considerable amount of pressing force and pressing force of the locking projection by the finger are required, and it is troublesome in operation, which is a problem.

"Means for Solving Problems" The present invention intends to eliminate the above-mentioned state of the art, and forms a void portion extending in the axial direction of the shaft cylinder in the boundary portion provided in the shaft cylinder, and at the same time, relates to the push member. When the locking protrusion is formed with a wider portion and a narrower portion than the width of the void portion and the locking protrusion has springed out of the shaft cylinder, the wide portion of the void portion A means for solving the problem is to be in a state of engaging with one of the through holes provided in the front and rear.

[Operation] According to the present invention, the locking projection protruding from the shaft cylinder at the position where it contacts the upper part of the locking projection in the writing state, that is, the rear end face of the front through hole provided in the shaft cylinder. By pressing the upper part of the inward toward the inner side of the barrel, the wide portion of the locking projection that abuts the rear end surface of the front through hole is separated from the rear end surface. Since the void part of the boundary part is wider than the narrow part of the locking projection part, the narrow part of the locking projection part passes through the void part and moves to the rear through hole side, and eventually, The locking projection releases its writing state by abutting a wide portion of the rear projection on the rear end surface of the rear through-hole by elastically propelling the locking projection outward. in this way,
In order to immerse the writing body in the barrel from the writing state, only the wide portion of the locking projection that is in contact with the rear end surface of the front through hole needs to be disengaged from the rear end surface. The amount of writing and the small pressing force enable the pen tip to immerse.

[Examples] Examples of the present invention will be described below with reference to the drawings.

The pushing member 3 is provided with a locking projection 4 which projects the pressing portion 8 from the rear end opening 1b of the barrel and elastically springs outward of the barrel. A space 5a extending in the axial direction of the shaft cylinder is formed in the boundary 5 of the shaft cylinder 1, and the locking projection 4 has a portion 4a wider than the width of the space 5a and a narrower width. The portion 4b is formed. The locking projection 4 is provided with a front through hole 6 and a rear through hole 7 which are formed in front and rear in the axial direction so as to communicate with the void 5a.
Which are alternately engaged with and disengaged from
Since the locking projection 4 has an arcuate front end 4'by pressing the shaft end toward the front end opening 1a of the barrel,
The front through hole 6 is engaged through the inlet 5b of the void 5a without receiving a large resistance force. At this time, the cursive body 2 that is urged by the elastic force of the coil spring S toward the rear end opening 1b of the shaft cylinder and abuts against the pushing member 3 is the front end opening 1a of the shaft cylinder.
The writing end 2a is moved in the direction against the elastic force, and the writing end 2a is exposed from the opening 1a to realize the writing state. In the writing state, the locking projection 4 has its wide portion 4a abutted against the rear end surface 6a of the front through hole 6,
It is in a state where it has blasted out to the outside of the barrel. Brush end 2a
In order to immerse the locking projection into the barrel 1, it is sufficient to push the upper part of the narrow portion 4b of the locking projection inwardly of the barrel in the writing state, and thereby the locking protrusion is pushed. The wide portion 4a of the portion 4 is detached from the rear end surface 6a of the front through hole 6 and moves toward the rear end opening portion 1b of the axial cylinder along with the backward movement of the writing body 2 biased by the elastic force of the coil spring S. Moving. At this time, the narrow portion 4b of the locking projection 4
Passes through the void 5a, and along with this, the locking projection 4
The wide portion 4a is brought into contact with the rear end surface 7a of the rear through hole 7 and is in a state of being fully bulged out of the barrel. Thus, the writing end portion 2 of the cursive body is immersed in the barrel 1.

[Advantage of the Invention] As described above, according to the present invention, the boundary portion of the shaft cylinder is formed with the void extending in the axial direction, and the void is formed in the locking projections engaging and disengaging the through holes in the front and rear of the void. A wider part and a narrower part are formed, and when the locking projection engages the wide part with one of the front and rear through holes, it is in a state of being fully bulged out of the barrel. Therefore, when the writing end of the cursive body is immersed in the barrel, simply press the upper part of the narrow part of the locking projection toward the inside of the barrel. , The immersive state is realized, and the inward pressing amount and the pressing force for the locking projection with respect to the locking projection are less than those of the conventional ones, and the elasticity of the locking projection is improved. Also, it is possible to easily realize a cursive body retracting mechanism that can be expected to operate reliably and easily, such as durability.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view illustrating the entire writing instrument embodying the present invention, and FIG. 2 is a partial cross-sectional top view illustrating the state in which the writing body is exposed outside the barrel in FIG. 1 ... Shaft cylinder, 2 ... Writing body, 3 ... Pushing member, 4 ... Locking protrusion, 4a ... Wide part, 4b ... Narrow part, 5 ... Boundary part, 5a ... ... void, 6 ... front through hole, 6a ... rear end surface, 7 ... rear through hole, 7a ... rear end surface, 8 ... pressing portion.

Claims (1)

[Scope of utility model registration request] 1. A writing body 2, which is accommodated in a shaft cylinder 1 by being biased toward a shaft cylinder rear end opening portion 1b, presses a pushing member 3 from the shaft cylinder rear end opening portion 1b side, and at the same time, pushes it on the pushing member 3. The locking projection 4 that elastically springs outward of the formed shaft cylinder 1 is engaged with and disengaged from the front through hole 6 and the rear through hole 7 provided in the shaft cylinder 1, and the writing end 2a thereof is opened at the front end of the shaft cylinder. In the knock-type writing instrument which is projected from and retracted from the lathe 1a, a gap 5a extending in the axial direction of the shaft cylinder is formed in a boundary portion 5 communicating with the through holes 6 and 7 of the shaft cylinder 1, and a projection for locking the pushing member 3 is formed. 4 has a portion 4a wider than the width of the void 5a and a portion 4b narrower than the width of the gap 5a, and when the locking projection 4 is fully elastic, the wide portion 4a is the rear end surface of the rear through hole 7. 7a or the rear end surface 6a of the front through hole 6 is set so as to be in a position to be in contact with the knock type writing. Cursive haunt mechanism in.