JPS595587Y2 - writing instrument cap - Google Patents

Description

[Detailed description of the invention] This invention relates to a cap for a writing instrument, and more specifically, the interior of the cap is maintained in an airtight state when the cap is attached, and the internal pressure of the cap is not reduced when the cap is removed. .

Traditionally, caps attached to writing instruments that use water-based ink have been designed to be attached to the barrel in an airtight manner to prevent ink from evaporating from the writing tip or drying and solidifying at the writing tip. must be designed and manufactured.

By airtightly attaching the cap to the barrel, it is possible to prevent the ink inside the writing instrument from evaporating and from drying and solidifying at the writing tip.

However, when the cap that has been airtightly attached to the barrel is removed, the space inside the cap increases by the amount of change in space volume, that is, by the volume of the barrel pulled out from inside the cap. As the pressure is reduced, the ink inside the writing instrument is drawn out and seeps into the cap from the writing tip, staining the barrel and the inside of the cap, contaminating hands and fingers when using the writing instrument, or dripping onto the paper surface. was often the case.

The present invention improves the above-mentioned drawbacks of the conventional ink, and prevents the ink from evaporating, drying and solidifying when the cap is applied, and prevents the ink from wetting into the cap when the cap is removed.

The feature of this design is that the inner cap has a double structure and is movable, and a hole is formed to communicate the inside of the inner cap with the outside air. or move to block the hole,
A packing is provided so that when the cap is removed from the shaft cylinder, the internal cap moves to open the hole.

As a result, when the cap is attached to the barrel of the writing instrument, the hole in the internal cap is closed and airtightness is maintained, preventing ink from evaporating and drying and solidifying. When the cap is removed from the barrel, After the inside of the inner cap communicates with the outside air of the outer cap through the hole, the cap is removed from the shaft cylinder, so that the internal pressure of the inner cap is not reduced.

A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

A leg of a clip 5 is attached to the front end 1 of a cylindrical exterior cap 3 having an inward protrusion 2 protruding in the radial direction on the front end 1 made of a synthetic resin or metal material and abutting the front surface 4 of the inward protrusion 2. A crown 8 is inserted into the crown 8 through a ring 7 for abutting and firmly pressing the leg 6, and a threaded cylinder 9 is inserted into the crown 8.
Then, attach the clip 5 using the inward protrusion 2 and the crown 8.

The threaded cylinder 9 has a small diameter portion 10 with a smaller outer diameter in the rear half, an inward protrusion 11 that projects in the inner diameter direction at the rear end, and a small diameter hole 12 centered on the axis.
A locking protrusion 13 is provided at the rear end corner of the small diameter portion 10 and slightly protrudes in the outer diameter direction.

Further, grooves 14 and 14□ are formed in the rear end corner of the small diameter portion 10 at symmetrical positions with respect to the axis to facilitate rotation of the threaded cylinder 9 with a driver (not shown).
This allows air to circulate as described below.

In the space 16 between the rear end surface 15 of the crown 8 and the inwardly protruding ridge 11 of the threaded cylinder 9, the front end surface 17 is brought into contact with the rear end surface 15, the rear end surface 18 is brought into contact with the inwardly directed ridge 11, and the axis is centered. A through hole 19 formed slightly smaller than the inner diameter of the small diameter hole 12
The elastic gasket 20 provided with is provided so as to be immovable.

Inside the exterior cap 3, a partition wall 22 provided perpendicularly to the axis at the front end 21 has a front end protrusion 23 that protrudes forward about the axis, and a front end protrusion 23 that is formed to have a larger diameter than the small diameter part 10 and has a front end protrusion 22 extending in the inner diameter direction. An interior cap 26 is provided with a peripheral wall 25 having an engagement protrusion 24 projecting thereon, and is movably provided with a gap 27.

The engaging protrusion 24 engages the small diameter portion 1 when the internal cap 26 moves.
The outer circumferential surface 28 of the inner cap 26 is in sliding contact with the locking protrusion 13 to prevent the inner cap 26 from moving backward.

The front end protrusion 23 has an outer diameter slightly larger than the inner diameter of the through hole 19 and a slightly smaller diameter than the inner diameter of the small diameter hole 12, and is inserted into the small diameter hole 12 and has a packing 20 inside the through hole 19.
The inner surface 30 of the through hole 19 is inserted into the outer circumferential surface 29 in close contact with the outer circumferential surface 29 so as to be able to slide against the elastic force of the inner cap 26 .
The internal cap 26 moves forward and the front end surface 34 of the front end protrusion 23 connects with the rear end surface 1 of the crown 8.
5, the opening 31 is in contact with the inner surface 3 of the through hole 19.
It is designed to be sealed by 0.

The interior cap 26 moves back and the opening 31 closes to the packing 20.
When positioned more rearward, the interior 32 of the interior cap 26
through the hole 33, the small diameter (L12, the gap 35 between the inward protrusion 11 and the partition wall 22, the grooves 14 and 14□, the gap 36 between the small diameter part 10 and the peripheral wall 25, the hole 31 provided in the peripheral wall 25, and the gap 27) The exterior cap 3 communicates with the outside air.

Each member may be configured so that the inside 32 of the interior cap 26 and the outside air of the exterior cap 3 communicate with each other by a route different from the route described above when the opening 31 is removed from the gasket 20 and opened. figure).

The rear end opening 38 of the inner cap 26 is given elasticity, so that when the inner cap 26 is attached to the barrel 40 of the writing instrument 39, the rear end opening 38 conforms to the outer shape of the barrel 40 and is sealed. In addition, the fitting force between the rear end opening 38 and the shaft cylinder 40 is made larger than the frictional force between the tip projection 23 and the packing 20.

When the barrel 40 of the writing instrument 39 to which the inner cap 26 is attached is formed to have elasticity, the inner cap 26
The rear end opening 38 is formed to be rigid so that when the inner cap 26 is attached to the shaft cylinder 40, the molding of the shaft cylinder 40 conforms to the internal shape of the rear end opening 38 to maintain a sealed state. At the same time, the fitting force between the rear end opening 38 and the shaft cylinder 40 is made larger than the frictional force between the tip projection 23 and the packing 20.

Since the first embodiment of the present invention is constructed as described above, when attaching the cap to the shaft cylinder, the fitting force between the rear end opening 38 and the shaft cylinder 40 is applied to the fitting force between the tip protrusion 23 and the packing 20. The inner cap 26 is formed to be larger than the frictional force.
moves forward before the rear end opening 38 is fitted into the shaft cylinder 40,
After the opening 31 is closed by the packing 20, the shaft cylinder 4
0 is fitted.

When the cap is removed from the shaft cylinder 4[1, the interior cap 26 is moved back before the rear end opening 3B is removed from the shaft cylinder 40, and the opening 31 is located rearward of the gasket 20 and opened, and the interior Inside 32 of cap 26 and outside cap 3
After the internal cap 26 is connected to the outside air, the inner cap 26 is connected to the shaft cylinder 40.
More detached.

A second embodiment of the present invention will be described below with reference to FIGS. 3 to 5.

a front end 1 of a cylindrical exterior cap 3 provided with an inward protrusion 21 made of synthetic resin or metal material and protruding in the radial direction;
, the clip 5 comes into contact with the front surface 4□ of the inward protrusion 2□,
A crown 8 is inserted through the legs 6 of the head 6 and a ring 7 for firmly pressing against the legs 6.
Screw the screw tube 91 onto 1 and attach the inward protrusion 2□ and the crown 8. Attach the clip 51.

The threaded cylinder 9□ forms a small diameter portion 10□ with the outer diameter of the rear half reduced, and a locking protrusion 131 is provided at the rear end corner of the small diameter portion 10 to slightly protrude in the outer diameter direction.

An inward protrusion 11 is provided on the inner surface of the substantially central shaft in the axial direction of the threaded cylinder 9.
□, and grooves 14□ and 143 are formed at symmetrical positions around the axis at the rear end of the screw tube 91, and the screw tube 9□ can be rotated by a driver (not shown). This is to make it easier to move and to allow air to circulate as will be described later.

The head 41 of the gasket 20□, which is made of an elastic material that can be deformed in a restorable manner, is fixedly fitted into the hole 12I formed by the inward protrusion 11 of the screw tube 9□ and centered on the axis. 11. A protrusion 43 protruding in a direction opposite to the head 41 is provided on the base 42 located further to the rear.

Further, on the base 42 of the packing 20□, there are four protrusions located diametrically outward from the protrusions 43 and equally spaced in the circumferential direction.
The leg portions 44 are individually arranged.

The leg portions 44 do not necessarily have to be provided.

Inside the exterior cap 3□, an interior cap 261 is provided with a partition wall 22□ perpendicular to the axis at the front end 1□ and a peripheral wall 251 protruding forward from the partition wall 22□, between it and the exterior cap 3□. Gap 27. It has a movable insert.

The partition wall 22□ is provided with a front end protrusion 23□ that faces the protrusion 43 provided on the packing 20□ and has a recess 46 that matches the shape of the surface 45 of the protrusion 43.

The front end protrusion 23 is provided with a hole 331 centered on the center of the recess 46, that is, the axis, so that the inside 32□ of the interior cap 261
The hole 33□ is configured to be closed when the recess 46 collides with the protrusion 43 and is in contact with the outside.

When the recess 46 collides with the protrusion 43 and the hole 331 is closed, the rear end surface 18□ of the leg 44 is pressed against the partition wall 22□ and contracts in the axial direction.

The peripheral wall 25 has an inner diameter larger than that of the small diameter portion 10 of the threaded cylinder 9, and has an engaging protrusion 24□ projecting in the inner diameter direction at the front end.

When the inner cap 26□ moves, the engagement protrusion 24 slides back against the outer peripheral surface 28□ of the small diameter portion 10°, and when it comes into contact with the locking protrusion 13□, the inner cap 26□ thereafter
This is to prevent the vehicle from moving backwards.

In addition, a hole 37□ is formed in the peripheral wall 25, and a recess 4 formed into the front end protrusion 23□ when the interior cap 26 retreats.
6 is separated from the surface 45 of the protrusion 43, the interior 32 of the inner cap 26 is inserted through the hole 33□, through the gap 47 between the legs 44, into the grooves 14□, 143, the hole 37, and the gap 27.
, to communicate with the outside air.

The rear end opening 38 of the interior cap 26 is given elasticity or is formed rigid as in the previous embodiment, so that the interior cap 26□ can maintain a sealed state when attached to the shaft cylinder 401. At the same time, the rear end opening 381 and the shaft cylinder 4
01 is applied to the small diameter portion 10□ of the threaded cylinder 91 and the peripheral wall 25.
The frictional force with the engagement protrusion 241 formed in □ should be greater than that.

Since the second embodiment of the present invention is constructed as described above, when attaching the cap to the barrel, the fitting force between the rear end opening 381 and the barrel 40 is reduced to the small diameter portion of the threaded barrel 9□. The inner cap 26, which is shaped so as to have a friction force greater than the friction force between the engagement protrusion 241 formed on the peripheral wall 25 and the inner cap 26, moves forward before the rear end opening 381 is fitted into the shaft cylinder 40. Recess 46
After colliding with the protrusion 43 and closing the hole 33□, the shaft cylinder 4
Fits into 01.

When the cap is removed from the barrel 40 □, the inner cap 26 is moved back and the inner cap 26 is moved from the surface 45 of the protrusion 43 into the recess 4 before the rear end opening 38 is disengaged from the barrel 40 □ and removed.
6 is separated and located at the rear, the hole 33□ is opened, and the inside 32 of the inner cap 26□ and the outside air of the outer cap 31 are communicated with each other, and then the inner cap 261 is removed from the shaft cylinder 40□.

As described above, the present invention maintains the airtightness inside the inner cap that fits into the barrel when it adheres to the writing instrument, so that the ink inside the writing instrument does not evaporate from the nib or This prevents the ink from drying and solidifying, allowing for handwriting that is always clearer than the initial stroke.

Furthermore, when the inner cap is removed from the writing instrument, the inside of the inner cap and the outside air communicate with each other at a location other than the opening at the rear end of the inner cap fitted into the barrel, so the inside of the inner cap is There is no need to create a depressurized state due to a change in volume, preventing ink from being drawn out due to depressurization inside the writing instrument, eliminating the possibility of the inside of the cap or the pen tip being contaminated by ink that comes out of the pen, and reducing shock when attaching or removing the cap. It has many excellent advantages, such as being able to do it easily and without any hesitation.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the first embodiment of the present invention in a state fitted to the shaft cylinder, Fig. 2 is a longitudinal cross-sectional view with a part omitted of the state separated from the shaft cylinder in the first embodiment, The figure is a vertical sectional view of the second embodiment of the present invention in a state fitted to the shaft cylinder, and the fourth embodiment.
The figure is a partially omitted vertical cross-sectional view of the second embodiment in a state where it is detached from the shaft cylinder, and FIG. 5 is a cross-sectional view of only the packing along the line V--■ in FIG. 3. 3.3□...Exterior cap, 20.20. ...Putskin, 26°26, ...Interior cap, 33.33,
... Hole, 38.38, ... Rear end opening of interior cap, 40.401 ... Shaft cylinder.

Claims (3)

[Scope of utility model registration request] (1) Exterior cap 3, interior cap 26 that is movable within exterior cap 3 and has hole 33, and interior cap 2
When the inner cap 26 is attached to the shaft tube 40, the seal 20 closes the hole 33 of the inner cap 26, and the inner cap 26 is removed from the shaft tube 40. At this time, the hole 33 of the inner cap 26 is opened, and the outside air and the inner cap 2
A writing instrument cap characterized by a 6-internal connection. (2) The cap for a writing instrument according to claim 1, wherein the rear end opening 3B of the inner cap 26 is made elastic. (3) A cap for a writing instrument according to claim 1, in which the rear end opening 38 of the interior cap 26 is formed rigidly.