JPH0423033Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial field of application" This invention relates to a mechanism for protruding and retracting the pen end of a writing instrument.

"Problems to be Solved by the Prior Art and the Present Proposal" Conventionally, the writing body, which is biased and housed in the barrel in the direction of the rear end opening of the barrel, is pressed by a pushing member that protrudes from the rear end opening of the barrel. A writing instrument is widely known in which the writing instrument is moved toward the opening at the tip of the barrel so that its end is exposed from the opening at the tip of the barrel. Therefore, in this type of writing instrument, a mechanism for ejecting and retracting the pen end is generally configured to utilize the interaction of a plurality of cam members to cause the pen end to protrude and retract simply by the pressing operation of a push member. However, this mechanism has a disadvantage in that the structure is complicated and the number of parts is large because it uses a rotating cam member, and it is not easy to repair in the event of an operational failure. I felt a hatred for him.

"Means for Solving the Problem" The present proposal was made in view of the state of the prior art, and as stated in the claims section of the utility model registration, two through holes bored in the shaft cylinder were proposed. Due to the interaction between the hole, the two through holes in the push member, and the push button member that engages with these, the end of the brush is exposed when the push member engages the through hole with the push button member. In addition, as a means to solve the problem, the brush end is retracted by operating a push button member and disengaging the push member from the through hole.

"Operations" and "Examples" Hereinafter, examples of the present invention will be described in detail, and the operations thereof will be explained.

The shaft tube 1 is provided with a large diameter hole 1a and a small diameter hole 1b that open in a direction perpendicular to the axial direction thereof. The large-diameter holes 1a and the small-diameter holes 1b alternately face the large-diameter through-holes 2a and the small-diameter through-holes 2b of the push member 2 installed in the shaft cylinder 1.

As described above, the pushing member 2 is provided with a small diameter through hole 2b connected to the large diameter through hole 2a. 3 is a push button member, which has a smaller diameter than the large diameter hole 1a of the shaft tube 1 and the large diameter through hole 2a of the push member 2;
The small diameter hole 1b of the push member 2, the large diameter portion 3a which is larger than the small diameter through hole 2b of the push member 2, and the small diameter hole 2 of the push member 2.
b and a small diameter portion 3b smaller in diameter than the small diameter hole 1b of the shaft cylinder 1.
It is composed of

The push button member 3 is mounted between the large diameter hole 1a and the small diameter hole 1b of the shaft cylinder 1, passing through the large diameter through hole 2a of the push member 2. In other words, the push button member 3 moves only in a direction perpendicular to the axis of the barrel 1, and as the push member 2 moves in the axial direction, the large diameter through hole 2a and the small diameter through hole are moved. 2b alternately. Further, it is necessary that the push button member 3 is always pressed in the direction of the small diameter hole 1b of the shaft cylinder 1, and this urging means is provided in a recess in the large diameter portion 3a of the push button member 3. 4, and one end of the coil spring S' inserted therein is attached to the shaft cylinder 1.
This biasing means is realized by contacting the bottom surface 5a of the clip 5 attached to the clip 5.

The writing body 6 presses the concave portion 6b and the convex portion 2 of the member 2.
c and is interlocked with the pushing member 2, and is always urged by a coil spring S toward the rear end opening 1d of the shaft cylinder.

1 and 3 illustrate a state in which the brush end 6a of the writing body 6 is recessed into the barrel 1 from the tip opening 1c of the barrel. The member 2 is moved in the direction of the rear end opening 1d of the shaft cylinder (in the direction of the arrow) by the elastic force of the coil spring S.
In addition, the push button member 3 engages its small diameter portion 3b with the small diameter through hole 2b of the push member 2, and moves in the direction of the rear end opening 1d of the shaft cylinder of the push member 2 (in the direction of the arrow).
It restricts movement to.

The brush end 6a of the writing body 6 is inserted into the barrel tip opening 1c.
In order to obtain the writing state by exposing the knob part 2d of the push member 2 in the state shown in FIG. By doing so, the large diameter through hole 2a of the push member 2 and the large diameter through hole 2a of the push button member 3 are engaged with each other. Since the diameter of the push button member 3 is smaller, the push button member 3 is pushed into the small diameter hole 1b of the shaft cylinder 1 by the elastic force of the coil spring S'.
The large diameter portion 3a is engaged with the large diameter through hole 2a of the pushing member 2, and the small diameter portion 3b is made to protrude from the small diameter hole 1b of the shaft cylinder 1 to open the rear end opening of the shaft cylinder of the pushing member 2. This will restrict movement in the 1d direction (arrow direction) (see Figures 2 and 4).
(see figure). In this way, the writing state is obtained, but in order to release this writing state and return to the retracted state shown in the first figure, the small diameter portion 3b of the push button member 3 protruding from the small diameter hole 1b of the shaft tube 1 is removed. It is sufficient to press the button member 1 in the direction of the large diameter hole 1a of the shaft cylinder 1 against the elastic force of the coil spring S' until its large diameter portion 3a separates from the large diameter hole 2a of the push button member 2. The push member 2, which has been disengaged from the large diameter portion 3a of the push button member 3, is pushed by the elastic force of the coil spring S until the small diameter through hole 2b engages with the small diameter portion 3b of the push button member 3. Rear end opening 1d
The brush end 6a is moved into the barrel 1 by moving in the direction shown in FIG.

``Effect of the invention'' As described above, the present invention allows the end of the cursive writing brush to appear and retract by engaging and disengaging the two large and small parts of the push button member into the two large and small through holes of the push member. The structure is simple, assembly work can be performed easily, and repair work in the event of an operational failure can also be performed easily. Furthermore, the pushing member of the present invention can perform its intended function even if its wall thickness is considerably thinned, so it can be applied to a so-called brush end retraction mechanism of a so-called flat writing instrument that has a thin wall and has other functions added to its flat part. This makes it possible to easily obtain a flat writing instrument that is suitable for applications such as this and is equipped with a brush end retracting mechanism.

[Brief explanation of the drawing]

1 and 2 are partially omitted vertical cross-sectional views illustrating a writing implement according to the present invention, and FIG. 1 illustrates a state where the end of the brush is exposed from the barrel,
The figure illustrates the immersed state. 3 and 4 are schematic diagrams showing the positional relationship between the push member and the push button part, and FIG. 3 illustrates the relationship in FIG. 1, and FIG. 4 illustrates the relationship in FIG. 2. Explaining. FIG. 5 is a schematic explanatory diagram showing the components of the present invention in an exploded manner. 1...Shaft tube, 1a...Large diameter hole, 1b...Small diameter hole, 1c...Shaft tube tip opening, 1d...Shaft tube rear end opening, 2...Pushing member, 2a...Large diameter through hole Hole, 2
b...Small diameter through hole, 3...Push button member, 3a...
... Large diameter portion, 3b... Small diameter portion, 5... Clip, 6... Cursive, 6a... Brush end.

Claims (1)

[Scope of utility model registration request] The writing body 6 accommodated in the barrel 1 is always biased toward the rear end opening 1d of the barrel 1.
In a writing instrument in which the brush end 6a is exposed from the barrel tip opening 1c by moving toward the barrel tip opening 1c by the pressing operation of the push member 2 protruding from the barrel, the barrel rear end opening 1c is moved. A large diameter through hole 2a and a small diameter through hole 2 are provided in the push member 2 protruding from the portion 1d.
A large diameter hole 1a and a small diameter hole 1b which open perpendicularly to the axial direction of the shaft cylinder 1 are bored facing each other. 1a and the large-diameter through-hole 2a of the push member, but the small-diameter hole 1b of the shaft cylinder and the small-diameter through-hole 2b of the push member
The push button member 3 is made up of a large diameter portion 3a that is larger in diameter than the cylindrical shaft, a small diameter portion 3b that is smaller than the small diameter through hole 1b of the barrel, and a small diameter portion 3b that is smaller than the small diameter through hole 2b of the push member. Large diameter through hole 2 of the pushing member between 1b
A pen end protrusion/retraction mechanism in a writing instrument, characterized in that the pen end part a is inserted through the pen and is always biased toward the small diameter hole 1b of the barrel.