CN2241633Y - Cap structure for pens with low viscosity ink - Google Patents

Abstract

A pen cover structure for low-viscosity ink pens with simplified components and free choice of material and shape of the outer cover. The outer cover that covers the front end of the pen barrel and the cup-shaped sealing body made of elastic material inside the outer cover constitute the pen cap. The peripheral edge of the free end is closely connected to the outer peripheral surface of the front end of the pen holder.

Description

Cap structure for pens with low viscosity ink

The utility model relates to a pen cap structure of a low-viscosity ink writing tool such as a signature pen and a ballpoint pen using low-viscosity ink.

Traditionally, the similar pen cap structure is representative of the pen cap as shown in Figure 4. In the figure, 1 is the pen cap. The finished inner cover 3 and the sealing body 4 made of rubber or the like fixed in the inner cover 3 constitute.

5 is the pen holder of pen tool, accommodates the cotton core 6 that contains water-soaked ink and the ink guide core 6a that extends forward from cotton core 6 in the pen holder 5, is connected to the writing nib 7 of ink guide core 6a from the front end mouth of pen holder 5 5a protrudes, and the front end peripheral surface of the pen holder 5 is provided with a ventilation hole 5b.

When the outer cover 2 of the pen cap 1 is covered on the penholder 5 of the pen, the protrusion 2a formed on the inner surface of the outer cover 2 will be crimped on the peripheral surface of the penholder 5 whose outer diameter gradually increases towards the rear until it is locked on the penholder 5 up to the locking part. At the same time, the peripheral edge of the free end of the inner cover 3 crosses the through hole 5b of the penholder 5 and is in close contact with the peripheral surface of the front end of the penholder 5 to isolate the vent hole 5b from the outside atmosphere. In addition, the nib 7 extends into the sealing body 4, and the free end peripheral portion of the sealing body 4 tightly wraps the front end 5a of the pen holder 5 to ensure that the nib 7 is isolated from the outside world.

However, this conventional pen cap 1 is composed of three components: the outer cover 2, the inner cover 3 for closing the vent hole 5b, and the sealing body 4 for sealing the nib 7, and the number of components is large to increase the manufacturing cost. problem exists.

In addition, in addition to the pen caps with the above structure, there are also pen caps consisting of only two components, the outer cover and the inner cover. This kind of pen cap relies on the outer cover to close the side vent hole, and uses the inner cover to seal the nib. However, for a pen cap with such a structure, the peripheral edge of the free end of the outer cover must be in close contact with the peripheral surface of the pen holder. In order to maintain good adhesion, that is, airtightness, the outer cover must be made of an appropriate material that is elastic and can maintain an aesthetic appearance. Therefore, the material of the outer cover cannot be selected arbitrarily, and is quite limited in manufacture.

The utility model is developed in view of the above-mentioned problems, and the purpose is to provide a pen cap suitable for low-viscosity ink pens by simplifying the assembly to reduce the number of components, and at the same time giving the outer cap flexibility in material and shape selection.

In order to achieve the above purpose, the pen cap provided by the utility model belongs to a pen cap structure for a low-viscosity ink pen that can cover the nib and the vent hole in the pen holder freely so as to isolate it from the atmosphere and prevent the ink from evaporating. , it is characterized in that: there is a gap between the front mouth of the penholder and the nib to form a vent hole, and the outer cover covering the front end of the penholder and the cup-shaped sealing body made of elastic material inside the outer cover The member constitutes the pen cap, and the sealing body can enclose both the nib and the vent hole when the outer cover is tightly closed on the front end of the pen holder, and the free end peripheral portion of the sealing body is closely connected to the outer peripheral surface of the front end of the pen holder.

Since the sealing body simultaneously seals both the nib and the through hole, one object is dual-purpose, the design is reasonable, the structure is simplified, and the number of components can be reduced. In addition, the outer cover has nothing to do with the sealing function of the nib and the air hole, so its material and shape can be freely selected and designed without limitation.

The specific embodiment of the utility model is now described in detail as follows according to the accompanying drawings, wherein:

Fig. 1 is the longitudinal sectional view of an embodiment of the cap structure of the utility model low-viscosity ink writing tool;

Fig. 2 is the front view of the low-viscosity ink pen tool of Fig. 1;

Fig. 3 is the A-A line sectional view of the used pen cap of the pen tool of Fig. 1;

Fig. 4 is a longitudinal sectional view showing an example of the cap structure of such a low-viscosity ink writing tool which is commonly used.

Fig. 1 shows the longitudinal sectional view of the pen cap structure embodiment of the low-viscosity ink pen tool of the present invention. Among the figure, 10 is a pen cap, and this pen cap 10 is made of an outer cover 12 and a sealing body 14 made of elastic materials such as soft glue such as synthetic rubber or polyethylene and polypropylene. As shown in FIGS. 2 and 3 , the sealing body 14 is positioned inside the outer cover 12 by rib protrusions 12 a formed at intervals of 90 degrees on the inner peripheral wall of the outer cover 12 . During assembly, the sealing body 14 is elastically radially contracted and deformed by its own material to cross the protrusion 12a, and then the outer side of the free end (open end) peripheral portion 14a of the sealing body 14 is locked and fixed on the rib of the outer cover 12 by using its elastic recovery. inside the protrusion 12a.

15 is the penholder of writing tool, and one is made of front end pen cone 15a and penholder body 15b, and two members 15a, 15b are integrated into one by screw thread. It is obvious that these two components can also be integrally molded as common products (refer to FIG. 4 ). When the screws are integrated, the front end of the pen holder body 15b is tightly against the inner wall of the front cone 15a, so that air can be prevented from leaking from the threaded part. As mentioned above, the front cone 15a and the pen holder body 15b do not have to be made separately, but can be integrally formed. At this time, there is no problem of air leakage at the threaded part, but the rear end of the pen holder body 15b reaches the rear of the front cone 15a. The inner diameters between the parts should be formed the same so that the refill shaft 16 described below can be inserted from the rear end of the penholder body 15b.

Inside the pen holder 15, in the illustrated embodiment, the refill shaft 16 of the water-based rollerball pen is housed, and the nib 17 at the front end of the pen refill shaft 16 protrudes from the front end mouth 15c of the pen holder 15. The inner diameter of the front end mouth 15c is larger than the outer diameter of the nib 17, so that there is a gap between the two, and this gap is the air hole 18 leading to the inside of the pen holder 15. 17a is the ball at the front end of the nib 17, and 19 is the ball on the pen holder 15. Inside the spring that pushes the refill shaft 16 to the rear.

For the outer cover 12 of the pen cap 10 that can be detached (covered and unplugged) at the front end of the pen holder 15, once it is covered on the front end of the pen holder 15, the nib 17 and the front air hole 18 will enter the opening of the sealing body 14 at the same time. The inner peripheral surface of the opening edge portion 14a of the sealing body 14 is in close contact with the outer peripheral surface of the tapered front end of the pen holder 15, so as to isolate the pen tip 17 and the air hole 18 from communicating with the outside atmosphere. In this way, when the pen tool is not used, the ink can be prevented from evaporating from the nib 17 and the air hole 18 . Because the sealing body 14 is made of elastic material, the nib 17 can surely abut against the inner end wall of the sealing body 14, and at the same time, the inner surface of the free end peripheral portion 14a of the sealing body 14 can also be in close contact with the front end outer peripheral surface of the penholder 15. .

In this embodiment, a pair of front and rear window portions 12b', 12b and 12', 12c are respectively formed at the rear and front end of the outer cover 12 as shown in Figures 1 and 2, so that the shape of the pen cover can be more precise. Changes and visual aesthetic effects, and at the same time prevent suffocation accidents in case young children swallow the cap by mistake. In this way, even if the outer cover 12 is provided with a window or a through hole, because the sealing body 14 still has a complete sealing effect, there will not be any problems affecting the sealing effect. free choice.

In another embodiment, a plurality of axial ribs (not shown) can be formed on the inner peripheral surface of the front end mouth 15 c to help support the nib 17 , and the gaps formed between the ribs serve as air holes 18 . Furthermore, the cross-sectional shape of the front-end mouth 15c is formed into a circle, and the cross-sectional shape of the nib 17 is formed into a rectangle, etc., and the cross-sectional shape of the front-end mouth 15c and the pen 17 is changed so that the gap formed between the two can be used as the air hole 18. .

In addition, the present embodiment is applied to the situation of a water-based ink pen to illustrate, but obviously, it can also be applied to using gelatinous low-viscosity ink, or the core cotton impregnated with ink, or using concertina-shaped ink cartridges, Or a signature pen, etc.

As mentioned above, according to the structure of the utility model, since there is a gap formed between the front end mouth of the penholder and the nib to form a vent hole, and the pen cover is only composed of the outer cover covering the front end of the penholder and the elastic material inside the outer cover. Made of a cup-shaped sealing body, the above-mentioned seal can seal both the above-mentioned nib and the vent hole when the outer cover is covered on the front end of the pen holder, and the free end peripheral portion of the sealing body is tightly bonded to the outer peripheral surface of the front end of the pen holder. In this way, the number of components can thus be reduced.

Also, because the outer cover is not related to the sealing function of the nib and the air hole, it has greater and more free options for its material and shape.

Claims (1)

1. the cap of one kind low adhesive ink water-color paintbrush tool structure can load and unload freely nib and is located at the passage covering of penholder so that it and ambient atmosphere completely cut off in order to the penholder leading section to a tool, constructs with cap with the low adhesive ink water-color paintbrush tool that prevents evaporation of ink;

It is characterized in that: the gap that is interlinked to the outside in being provided with between the front end mouth of penholder and the nib is to form passage, and constitute cap with the enclosing cover that covers the penholder leading section and two members that are installed with the cup-shaped seal of making by elastomeric material in this enclosing cover, and make the sealing body when enclosing cover covers tight penholder leading section, can seal nib and passage both, and the free end circumference of seal then is to connect airtight penholder front end outer peripheral face person.

Images