JPH0221398B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention makes it possible to write by making the lead of the ballpoint pen appear and disappear only by expanding and contracting the shaft of the ballpoint pen, making it convenient to store in a pocket when not in use, and at the same time making it convenient to store in a pocket when not in use. This is intended to simplify the process.

The present invention will be described in detail with reference to the illustrated embodiment. The front shaft portion 1 and the rear shaft portion 2 are slidably fitted to the front shaft portion 1.
As a result, the tip barrel portion 1 includes a cylindrical tip barrel body 3, a cap 4 screwed onto the tip of the tip barrel body 3, and a sliding thread 7 between the cap 4 and the rear collar portion 6. A sliding tip 5 that is movably inserted, a core tube 9 that is fixed to the rear part of the tip shaft body 3 and has a length that is inserted up to the intermediate stopper part 8 of the sliding tip 5, and a latch that projects rearward. Protrusion 10
A front shaft crown 11 having a front shaft crown 11 is inserted through the insertion hole 12 provided on the side of the front shaft crown 11 so as to be movable back and forth, and the tip can freely press the rear flange 6 of the sliding tip 5. The push rod 13 is similar to the one shown in FIG.

At the joint 14 between the front shaft part 1 and the rear shaft part 2, stopper pieces 15, 15' are in contact with the rear part of the front shaft main body 3, and the protrusions 16,
16' is fitted into the hole 17 of the tip shaft body 3 and the hole 28 of the tip shaft crown 11, and fixes the tip shaft crown 11, and also tapers the tip of the rear shaft body 19, which will be described later, to form a stopper piece 15, 15'. so that it hits
It is made so that it does not fall out. The core tube 9 is the front shaft crown 11
The ballpoint pen refill 18 can be tightly inserted into the core tube 9.

The rear shaft portion 2 consists of a rear shaft crown 21 in which a hanging body 20 for removably locking the rear shaft main body 19 and the above-mentioned locking protrusion 10 is installed, and the front shaft main body of the rear shaft main body 19 3, the latching protrusion 10 locks into the latching body 20.
At the same time, the rear end of the push rod 13 is attached to the rear shaft crown 2.
1 to push the push rod 13.

In the figure, 22 is a clip. Numerals 23 and 23' are protrusions provided on the push rod 13 to prevent the push rod 13 from accidentally falling during assembly.

The distance between the cap 5 and the rear flange 6 of the sliding tip 4, the length of the push rod 13, the latching protrusion 10 and the latching body 20
The distance between them, the length of the ballpoint refill 18, etc. are determined based on their relative relationship.

The present invention is realized as described above, and in order to use it, the rear shaft main body 19 must be pulled rearward from the contracted state shown in FIG. 1 to the extended state shown in FIG. When the hanging body 20 is disengaged, the pressure of the push rod 13 is released, and the sliding tip 5 is retracted inward by the spring 7, and at the same time, the tip of the ballpoint refill 18 is exposed, and the pen is in a writing state. At this time, the tip of the core tube 9 is hooked to the intermediate stopper portion 8 of the sliding tip 5. Further, by pulling the rear shaft main body 19 rearward to the limit, it becomes elongated, and at this time the push rod 13 is separated from the sliding tip 5 and the rear shaft crown 21.

To change the state from the extended state shown in FIG. 2 to the contracted state shown in FIG. The moving tip 5 is pushed forward against the spring 7 to hide the tip of the ballpoint pen refill 18, and at the same time, the latching protrusion 10 and the latching body 20 are engaged, and the whole is contracted and stored. At this time, the core tube 9 and the intermediate stopper part 8 are unlatched, but the push rod 13 is
Since it is pressed, the sliding tip 5 does not pull inward.

As described above, the present invention consists of a tip shaft portion, a rear shaft portion that is slidably fitted into the tip shaft portion and can be freely adjusted for expansion and contraction, and the tip shaft portion includes a tip shaft body to which a base is screwed, A ballpoint pen refill is inserted into and removably inserted into a core cylinder installed in the tip shaft body, and the tip of the ballpoint pen refill is inserted into the base so that the tip of the ballpoint protrudes from the base, and a spring is inserted between the ballpoint pen refill and the base. It consists of a sliding tip that can be freely protruded to a position where it is concealed, and a push rod that protrudes behind the tip shank and can press the sliding tip against the spring. The sliding tip can be freely pressed by pushing the main body into the front shaft body, and the rear shaft portion can be freely latched to the front shaft portion at the pushed-in position, so that the rear shaft body can be pushed in and pulled rearward. You can make the tip of the ballpoint refill appear and disappear just by operating it, making writing work easier.
Alternatively, the storage operation can be carried out smoothly, and when the pen is retracted, the tip of the ballpoint refill will not inadvertently protrude beyond the tip of the sliding nib, so there is no risk of staining the pocket, etc., and the pocket of the dress shirt, etc. Even if the pen is stored in a shallow place at the bottom of the pen, the clip of the relatively shortened ballpoint pen is sufficiently hooked to the rim of the mouth, so it will not fall out accidentally.

In addition, since the tip of the ballpoint pen refill protrudes before the rear shaft extends to its limit, it is convenient to write with it short or long when in use.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the ballpoint pen of the present invention when it is retracted, and FIG. 2 is a cross-sectional view when it is expanded. 1 is the front shaft part, 2 is the rear shaft part, 3 is the front shaft body, 4 is the base, 5 is the sliding tip metal, 7 is the spring, 9 is the core tube, 10
is the latching protrusion, 11 is the crown of the tip, 13 is the push rod, 18
is a ballpoint refill, 20 is a hanging body, and 21 is a rear crown.

Claims (1)

[Claims] 1 Consists of a tip shaft portion and a rear shaft portion that is slidably fitted into the tip shaft portion and can be freely adjusted for expansion and contraction; A ballpoint pen refill that is removably inserted into a core tube so that the tip protrudes from the cap, and a spring that is inserted between the ballpoint pen refill and the cap and can freely protrude to a position where the tip of the ballpoint pen refill is hidden. It consists of a sliding tip and a push rod that protrudes behind the tip shaft and can press the sliding tip against the spring. A retractable ballpoint pen in which the sliding tip can be pressed freely by a push-in operation, and the rear shaft can be freely latched to the front shaft in the push-in position.