JPH084316Y2 - Deadline cap for ink writing instruments - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a shutoff cap at the tip of an ink-type writing instrument.

[Prior Art] More specifically, the present invention relates to an elastic tip seal that sealingly contacts the writing tip of the writing instrument when the writing instrument is loaded, and a large diameter of the writing instrument behind the writing tip when the writing instrument is loaded. The present invention relates to a shut-off cap for an ink-based (including a smear or Indian ink) writing instrument, which has a portion (particularly a ring surface) and an elastic seal ring which is sealingly contacted.

According to a known shut-off cap of this type (German Patent Publication 3702785), the seal and the seal ring are formed by a cup-shaped shut-off cap made of an elastic material, the bottom wall of which is a cap for a writing instrument. When fitted, forms a seal by sealingly engaging the front end of the writing tip, and the ring surface surrounding the opening area of the pressure balance system of the writing instrument with respect to the ambient air is the ring shape of the shutoff cap. Contact the area.

In this known shut-off cap, the ring surface of the writing instrument is first placed in the ring-shaped area of the shut-off cap when it is installed, so that the shut-off cap is such that the front end of the writing tip seals with the writing instrument. With a stop contact, the writing instrument is compressed before its final position in the shut-off cap is fixed. In this case, a certain overpressure is generated in the cup-shaped shutoff cap when it is placed on the ring-shaped region, and this overpressure is propagated through the pressure balance system into the writing instrument. Further, when the writing instrument is taken out from the shutoff cap, the writing tip is first released from the tip seal and a negative pressure is generated, so that a droplet may be generated at the front end of the writing tip.

Another problem with the known configuration is that it ensures that the sealing contact of the tip seal with the writing tip and the sealing contact of the seal ring with the large diameter part (especially the ring surface) are practically always established. In order to achieve this, it is necessary to make manufacturing tolerances of each part relatively strict.

[Problems to be Solved by the Invention] The problem of the present invention is that not only the tip seal and the seal ring always act effectively when the writing instrument is loaded, but also the area between the tip seal and the seal ring is overloaded when loaded. It is to improve the shut-off cap so that the possibility that is satisfied is eliminated.

[Means for Solving the Problems] This problem is a closure cap of the type described at the beginning, in which the tip seal and the seal ring are composed of separate structural parts, and these structural parts are independent of each other. The seal ring, which is held by the body and has a sealing ring axially spaced from one another, of which the one closer to the tip seal is the one remote from the tip seal. Is solved by engaging with the writing instrument at a small-diameter portion ahead of the large-diameter portion before contacting the large-diameter portion of the writing instrument.

[Operation / Effect] By forming the tip seal and the seal ring as separate structural parts, the positions of these members are independent of each other, and therefore the deformation of one member causes the displacement of the other member. Moreover, since the sealing area near the tip of the seal ring comes into contact with the small-diameter portion of the writing instrument before the sealing area for the large-diameter portion without causing it, overpressure or negative pressure is established between them. It is also prevented and the large tolerance is allowed.

Other embodiments of the present invention are set forth in claims 2 and below. The reference numerals in the drawings attached to the claims are for the purpose of facilitating understanding and are not necessarily intended to limit the present invention to the illustrated modes.

It is preferable that the large-diameter portion includes a ring surface, and the ring surface has a configuration corresponding to a writing instrument located outside the ventilation opening of the writing instrument (claim 2). According to the structure of claim 2, when the writing instrument is attached to and detached from the cap, overpressure or negative pressure is not generated, and a seal is produced between the writing instrument and the ring surface of the writing instrument at the rear of the tip of the writing instrument and the inner surface of the cap body. The seal will be achieved more reliably.

Since the sealing region of the seal ring, which is closer to the tip seal, is formed in a tongue-like shape toward the central axis, the seal ring is better than the tip seal portion. It has a flexible and sealing property and is formed into a simple structure.

It is preferable to dispose the tip seal in the central opening of the cylindrical protrusion formed on the inner surface of the bottom of the main body (claim 4).
According to the structure of claim 4, the tip seal can be easily press-fitted and held in the cylindrical hollow portion without fear of falling off even when the cap is removed.

The seal ring is preferably retained in the coil spring, and the tip of the coil spring opposite to the seal ring is fixed in the body (Claim 5), and the tip of the coil spring opposite to the seal ring is preferably the body. It is preferable that it is clamped in the ring surface of the inner surface of the bottom part of the base (claim 6).

According to the fifth and sixth aspects of the invention, the seal ring is locked (joined) to the cap main body in a centered and elastic manner independently of the tip seal via the coil spring. This allows for greater tolerance of the component.

Next, a preferred embodiment of the present invention will be described in more detail with reference to the drawings.

[Example] The cut-off cap shown in the drawing has a cylindrical projection 2 formed from the inner surface of the bottom of the main body 1 toward the cap opening, and the central opening 3 of this projection 2 has an elastic material. The spherical tip seal 4 made of, for example, is held by a tightening action by, for example, press fitting.

An annular space is formed between the outer wall of the cylindrical protrusion 2 and the cylindrical ring surface 8 adjacent to the inner surface of the bottom of the main body 1, and the coil spring 7 is formed in this space. The lower end extends,
The lower end region of the coil spring 7 has a clamp shape, and the ring surface 8
Abut, and thereby retained in the body 1. A seal ring 5 made of an elastic material such as rubber is seated on the upper end of the coil spring 7, and the upper end of this seal ring 5 in the shape of a bush projects radially outward as a ring flange 6 and the lower end thereof , Tongue (or lip) seal 9
Is formed so as to project inward in the radial direction. The cylindrical portion of the seal ring 5 is clamped (elastically pressed) and held in the coil spring 7, and the bottom surface of the ring flange 6 is placed on the upper end portion of the coil spring 7.

When the shut-off cap is not loaded with a writing instrument, the coil spring 7, which is basically in a non-tensioned state at this time, holds the seal ring 5 clearly above the annular projection 2. (Right half of the figure).

A writing instrument 10 (a cylindrical writing instrument having a cylindrical body 12 supporting a writing tube 11 at its front end and accommodating a conventional falling weight 15 inside thereof may be used as the writing instrument 10). The wall of the cylindrical body 12 is provided with a ventilation groove 14 which extends rearward and communicates with a conventional pressure balancing system). Under the ventilation groove 14, 9 comes into contact with the peripheral wall of the small diameter portion near the tip of the cylindrical body 12 and easily elastically bends and seal-engages, and then to the outside of the ventilation groove 14 in the radial direction. A ring surface (shoulder portion) 13 of a certain cylindrical writing instrument 10 engages with the ring flange 6 of the seal ring 5 in a sealing manner. The pressure balance system is
In this way, it is sealed against the ambient air without creating an overpressure in this area. When the cylindrical writing instrument 10 is further inserted into the shutoff cap, the seal ring 5
While further compressing the coil spring 7, the coil spring 7 is displaced toward the cylindrical projection 2, and when the front end of the writing cylinder 11 eventually engages with the spherical tip seal 4 in a sealing manner, the tip end of the cylindrical body 12 becomes thinner. The conical surface is placed on the correspondingly widened conical opening area of the opening 3 of the cylindrical projection 2. This allows for cylindrical writing instruments
Further insertion movement into the shutoff cap of 10 is prevented.

As can be seen from the above description, the seal ring 5 does not couple with the spherical tip seal 4 and neither overpressure nor negative pressure occurs between these seals 4, 5.
Engagement with the cylindrical writing instrument 10 is performed. Further, since the seal ring 5 is kept in the engaged state by the coil spring 7,
There are no tolerance problems when placing both seals 4, 5 inside the body 1 of the shutoff cap.

[Advantage of the Invention] According to the present invention, when the writing instrument is loaded, a precondition that the tip seal and the seal ring can always work effectively is given, and it is effective that the overpressure is generated in the area between the tip seal and the seal ring. It is possible to prevent it and tolerate a large tolerance (referred to as "basic effect", claim 1).

The other dependent claims have, in addition thereto, additional effects. According to claim 2, the above-mentioned basic effect can be achieved more reliably. According to the third aspect, the flexible sealing area of the tip sealing area of the seal ring is realized with a simple structure, and the basic effect is surely realized.

According to claim 4, the tip seal does not fall off even when the cap is removed. According to the fifth and sixth aspects, the seal ring is locked to the cap body in a centered and elastic manner independently of the tip seal, and a larger tolerance is allowed.

[Brief description of drawings]

The figures show, in the left half, a longitudinal section through a closure cap according to the invention when the writing instrument is loaded and in the right half, the closure cap when separated from the writing instrument. 1 ... Main body. 4 ... Tip seal. 5: Seal ring.
10 ... Writing instrument. 11: Writing edge (writing tip). 13 …… Ring surface (large diameter part).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-137995 (JP, A) real-open Sho-52-118036 (JP, U) real-open Sho-58-104682 (JP, U) real-open Sho-63- 23083 (JP, U) Showa 57-2150 (JP, Y2)

Claims (6)

[Scope of utility model registration request] 1. An elastic tip seal which sealingly contacts the writing tip of the writing instrument when the writing instrument is loaded, and a sealing contact with a large diameter portion of the writing instrument behind the writing tip when the writing instrument is loaded. A closing cap for an ink-type writing instrument, comprising: an elastic sealing ring, wherein the tip seal and the sealing ring are composed of two separate structural parts, and these structural parts are independent of each other. The seal ring (5) has two sealing zones (6: 9), which are held in the body of the body and are axially spaced from each other, of which one is closer to the tip seal (4). The stop area (9) engages the writing instrument (10) at a small diameter portion ahead of the large diameter portion before the sealing area (6) remote from the tip seal (4) abuts the large diameter portion of the writing instrument. A shut-off cap characterized by: 2. The seal ring having a structure in which the large-diameter portion includes a ring surface (13), the ring surface having a structure corresponding to a writing instrument outside the ventilation opening of the writing instrument. Shut-off cap described in. 3. The sealing region (9) of the seal ring (5), which is closer to the tip seal (4), is formed tongue-like and easily flexible toward the central axis. Claim 1 or 2
Shut-off cap described in. 4. A tip seal (4) is arranged in a central opening (3) of a cylindrical projection (2) formed on the inner surface of the bottom of the main body (1). 3. The shutoff cap according to item 1. 5. The seal ring (5) is retained in the coil spring (7), and the tip of the coil spring (7) opposite to the seal ring (5) is fixed in the body (1). The shutoff cap according to claim 1, characterized in that 6. The end of the coil spring (7) opposite to the seal ring (5) is clamped in a ring surface (8) on the inner surface of the bottom of the body (1). The shutoff cap according to claim 5.