JP3174772U - Seal cap - Google Patents

Abstract

There is provided a seal cap that can be stably matched with a seal and prevents a large resistance from being generated when fitting with the seal.
The seal cap includes an outer packet part and a holding ring attached to an inner peripheral surface of the outer packet part. The outer packet part 3 is a cylindrical body whose tip is closed by a lid part 32. The holding ring 4 is a cylindrical body that is open at both ends, and has a C-shaped ring shape. The holding ring 4 is formed with a bulging portion 41, and when the seal cap is attached to the distal end portion 11 of the seal, it is pressed against the outer peripheral surface 11 b of the distal end portion 11 of the seal and elastically deforms. The holding ring 4 is formed with a plurality of slits 43 in the proximal direction from the distal end, thereby forming a plurality of leg portions 44 and a ring-shaped portion 45 that connects the leg portions 44.
[Selection] Figure 4

Description

  The present invention relates to a seal cap for protecting the seal surface of a seal, and particularly to a seal cap that exhibits a great effect when formed from a natural material.

  Conventionally, natural materials such as buffalo horn and ivory have been used as seal materials. In order to protect the seal surface of the seal from abrasion and impact, a seal cap (also called “saya”) that can cover the tip of the seal has also been widely used.

  For this seal cap, the same natural material as the seal is often used in terms of design. However, when the seal cap is made of a natural material, the seal cap is formed thinner than the seal stamp body, and is easily deformed by the influence of outside air. Specifically, under the influence of moisture in the outside air, the seal cap shrinks during drying, making it difficult to remove from the seal, and if it is forced to fit, scratches may occur on the outer peripheral surface of the tip of the seal was there. On the other hand, when the humidity is high, such as in rainy weather, the seal cap is likely to swell and come off, and the seal cap may be lost.

In manufacturing this seal cap, the seal cap was polished by hand so that the seal cap closely matched the seal. In order to use the seal cap without any problem, it is necessary to finish the cap size (inner diameter) with a tolerance of +0.03 mm to 0.05 mm with respect to the size (outer diameter) of the seal. However, due to the influence of moisture in the outside air as described above, deformation exceeding this tolerance occurs, so that the above-mentioned problem occurs after the seal stamp is passed to the user's hand. This is a problem that often occurs as long as natural material seal caps are used, and it has been a long-standing problem for seal manufacturers, such as the necessity to use synthetic resin caps. Further, even when a synthetic resin cap is used, it has not been possible to completely prevent loosening due to processing accuracy.
The inventor has solved the above-mentioned problems by developing a seal cap shown in Patent Document 1. Although the seal cap shown in Patent Document 1 has been put into practical use and the problem of detachment of the seal cap could be solved, there was a sense of resistance when fitting the seal stamp to the seal cap.

Japanese Patent No. 4478543

  In view of the above, the present invention relieves the feeling of resistance when fitting a seal into a seal cap, while preventing the seal cap from coming off the seal and making it consistent with the seal. Is intended to provide.

  The present invention is a seal cap that covers a tip portion of a seal with a marking surface at the tip, the seal cap including an outer packet part and a holding ring attached to an inner peripheral surface of the outer packet part. The portion has a cylindrical shape with a distal end closed by a lid portion and a proximal end opened, and the holding ring has a cylindrical shape with both ends open, and a bulging portion is formed on the inner peripheral surface of the holding ring. The bulging portion protrudes inward from the reference surface that allows the tip portion of the seal to pass through, of the inner peripheral surface of the retaining ring, The present invention relates to an improvement in which the bulging portion is deformed by being pressed against the outer peripheral surface of the tip portion of the seal when the seal cap is attached to the tip portion of the seal.

  In the present invention, the holding ring is formed with a plurality of strip-shaped slits from the distal end toward the proximal end side with respect to the bulging portion, and thereby a plurality of leg portions adjacent to each other across the space by the slit. And a ring-shaped part connecting the base ends of the leg parts, wherein at least a part of the bulging part is provided on the leg part.

  The bulging portion is formed by bulging a part of the holding ring inward, and is provided on the inner peripheral surface of the holding ring over the entire circumference. And a retaining portion that contacts the proximal end of the ring-shaped portion of the retaining ring is provided on the proximal end side of the outer packet portion, and the distal end of the leg portion of the retaining ring is connected to the distal end of the outer packet portion. By contacting the lid, the holding ring is disposed between the retaining portion and the lid, and the width of the belt-like slit is larger than the thickness of the leg. The retaining ring is preferably implemented as a C-shaped ring having a cut at one place.

  In the implementation of the present invention, the bulging portion of the retaining ring attached to the inner peripheral surface of the outer packet portion is pressed and deformed by the outer peripheral surface at the distal end portion of the seal, so that the bulged portion becomes the distal end of the seal. The seal cap can be prevented from falling off from the seal stamp. Therefore, the seal surface of the seal can be reliably protected, and even when a seal cap is formed of a natural material, it can be stably matched to the seal without being affected by moisture in the outside air. .

  Moreover, in the present invention, the holding ring is formed with a plurality of strip-shaped slits from the distal end toward the base end side with respect to the bulging portion, so that a plurality of adjacent legs sandwiching a space by the slit. And a ring-shaped part connecting the base ends, and by providing the bulging part on the leg part, each leg part is elastically deformed independently. Thereby, the resistance at the time of fitting a seal cap in the front-end | tip part of a seal can be decreased. At that time, when the slits are thin and attached to the outer packet part, if the adjacent leg parts are in contact with each other, even if the leg parts try to elastically deform independently, they will cushion each other and elastically deform well. However, in the present application, the adjacent leg portions are adjacent to each other with the space formed by the slit therebetween, so that the leg portions cushion each other. Can be prevented.

  The width of the strip-shaped slit is preferably larger than the thickness of the leg portion, and the retaining ring is a C-shaped ring having a cut at one place, whereby the retaining ring It is possible to easily perform the work of mounting the to the outer packet part.

It is a perspective view which shows the seal and seal stamp cap of this example. It is a decomposition | disassembly longitudinal cross-sectional view which shows the structure of the seal cap of this example. (A) is a developed view of the retaining ring of the seal cap of this example, (B) is a sectional view taken along the line BB, and (C) is a sectional view taken along the line CC. It is a longitudinal cross-sectional view which shows the mode at the time of inserting the front-end | tip part of the seal stamp of this example in a seal cap, (A) shows the state before a deformation | transformation of a bulging part, (B) is the state which the bulging part deform | transformed. Indicates.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the seal stamp cap 2 according to this example is detachably fitted to the tip of the seal stamp 1. The seal 1 is a round mark having a circular cross section at the tip portion 11, but the present invention is not limited to the round mark, and the seal shape of the tip portion 11 is a polygonal seal such as a quadrangle. The shape of the seal cap may be changed to a polygon or the like accordingly.

  As materials for the seal 1 and the seal cap 2, buffalo, cattle horn, wood such as ivory and boxwood, and various other natural materials can be used, but other materials such as synthetic resin and metal can also be used. .

  The tip 11 of the seal 1 is provided with a stamp surface 11a, as in a normal seal, and is stamped. The seal stamp cap 2 can cover the tip 11 of the seal stamp 11. As shown in FIG. 2, the seal cap 2 of this example includes an outer packet part 3 and a holding ring 4.

  The outer packet part 3 is formed from the same natural material as the seal 1. As for the shape of the outer packet part 3, an opening part 34 is formed on the base end side, and the tip part 11 of the seal 1 is inserted from the opening part 34. A lid portion 32 is provided on the distal end side of the outer packet part 3, and the outer packet part 3 forms a hollow cylindrical body with one end closed as a whole. A holding ring 4 is attached to the inner peripheral surface 31 of the outer packet part 3.

  The holding ring 4 is attached to the inner peripheral surface 31 of the outer packet part 3. In this example, it is made of a synthetic resin and is a hollow cylindrical body having both ends opened. Specifically, in this example, polyoxymethylene (POM) which is a thermoplastic resin is used. This resin is excellent in chemical resistance, creep resistance, fatigue resistance, and frictional wear resistance, and even if vermilion components adhere, there is no risk of corrosion. In addition, the material used for the holding ring 4 of the present invention is not limited to this, and may be one using an elastic material such as another synthetic resin or metal.

  The retaining ring 4 may be formed in advance in a perfect cylindrical shape (an endless ring not cut in the axial direction). In this embodiment, the retaining ring 4 has a C-shape having a cut at one place. Is implemented as a shaped ring. A developed view thereof is shown in FIG. The retaining ring 4 may have a flat plate shape as shown in the developed view, but the one formed in advance in a C-shaped three-dimensional shape is easier to attach to the outer packet part 3.

  The holding ring 4 of the present example is formed so that the diameter of the reference surface 42 which is the inner peripheral surface excluding the bulging portion 41 described below is larger than the outer diameter of the tip portion 11 of the seal 1 in the mounted state on the outer packet portion 3 It has been done. That is, it is of a size that allows passage of the distal end portion 11 of the seal 1 in a state of being attached to the outer packet portion 3.

  In the holding ring 3, as shown in FIG. 2, the bulging portion 41 is formed by bulging a part of the holding ring 4 inward, and the outside of the bulging portion 41 is a deformation-allowable space. It is made into the groove shape which has 41a. That is, the bulging portion 41 is a portion in which the plate thickness of the holding ring 4 is substantially the same and is bulged inward as it is. In this example, one row of bulging portions 41 is provided on the inner peripheral surface of the holding ring 4 over the entire circumference in the circumferential direction.

  The bulging portion 41 protrudes inward from the reference surface 42 in the inner peripheral surface of the holding ring 4. In this example, since the holding ring 4 is cylindrical, the diameter of the bulging portion 41 is smaller than the diameter of the reference surface 42. As shown in FIG. 4, when the seal cap 2 is attached to the distal end portion 11 of the seal 1, the bulging portion 41 is compressed by the outer peripheral surface 11 b of the distal end portion 11 of the seal 1 and can be deformed. ing.

  The holding ring 4 has a slit 43 formed from the tip (the lower end in FIGS. 2A and 3A). The slit 43 extends from the tip (lower end in the figure) toward the base end direction (upward in the figure). In this example, the slit 43 reaches the base end (upper end in the figure) of the bulging portion 41. ing. By forming the slit 43, the holding ring 4 is formed with a plurality of leg portions 44 adjacent to each other with a space formed by the slit 43 and a ring-shaped portion 45 connecting the base ends of the leg portions 44. It will be. At least a part (all in the figure) of the bulging part 41 is formed on the leg part 44. The width of the slit 43 (the width on the right and left in the figure) is larger than the thickness of the holding ring 4, whereby when the leg portions 44 are elastically deformed, the leg portions 44 can be kept in an unbuffered state, The legs 44 can be independently deformed. The width of the slit 43 is desirably equal to or larger than the difference between the radius of the bulging portion 41 and the radius of the ring-shaped portion 45, and specifically, desirably 1 mm or more.

  The leg 44 has a width of 1 mm or more, more preferably 2 mm, in order to prevent the seal cap 2 from coming off from the seal 1 with difficulty. On the other hand, it is sufficient to form two or more leg portions 44, but it is desirable that the number of leg portions 44 be three or more, and more desirably four or more for smooth and independent deformation. Therefore, although the number of the slits 43 and the leg portions 44 is eight in this example, it is preferably about 4 to 16 although it depends on the size of the seal.

Here, as shown in FIG. 2, a retaining portion 33 is formed on the inner peripheral surface 31 of the outer packet portion 3. In this example, the retaining portion 33 is provided to project inward in the opening 34 of the outer packet portion 3. And the holding ring 4 is coordinated between the said retaining part 33 and the cover part 32 of the outer packet part 3 (refer FIG. 4 (A)). The retaining portion 33 prevents the retaining ring 4 from coming off from the outer packet portion 3 to the proximal end side of the seal cap 4. In this example, the retaining portion 33 is continuously provided over the entire circumference in the opening 34 of the outer packet portion 3, but is not limited to this, and is a portion protruding from the inner peripheral surface 31 of the outer packet portion 3. And portions that do not protrude may be provided alternately, and the retaining portions 33 may be provided intermittently. Further, in this example, as shown in FIG. 4, the inner surface 33 a of the retaining portion 33 and the reference surface 42 of the retaining ring 4 constitute the same surface. A step may be formed with respect to the reference surface 42 of the retaining ring 4 as long as it does not obstruct the passage.
In contrast to the above, a mounting groove for fitting the holding ring 4 to the inner peripheral surface 31 of the outer packet part 3 may be formed by cutting, leaving a portion corresponding to the retaining part 33.

  At the time of mounting, in this example, the holding ring 4 is implemented as a C-shaped ring. Therefore, the diameter of the retaining ring 4 is reduced by elastically deforming it by picking the C-shaped ring, etc. The location of the retaining portion 33 on the peripheral surface 31 is passed. Thereafter, the holding ring 4 is smoothly mounted between the retaining part 33 and the lid part 32 of the outer packet part 3 by releasing the force by releasing the hand or the like.

  Moreover, as described above, the retaining ring 4 is provided with the slits 43 from the distal end side. The retaining ring 4 is divided into a plurality of legs 4 at the distal end side, but is ring-shaped portion 45 at the proximal end side. However, it is continuous in the circumferential direction, except for one C-shaped break. Therefore, it is stably supported with respect to the retaining part 33 of the outer packet part 3. In particular, as described below, even when the stamp 1 is inserted and removed, there is no possibility that the ring-shaped portion 45 protrudes from the retaining portion 33.

  Here, the dimension L3 between the retaining part 33 and the lid part 32 of the outer packet part 3 is formed larger than the axial dimension L4 of the retaining ring 4. Therefore, the retaining ring 4 is arranged with play in the outer packet part 3 between the retaining part 33 and the cover part 32, that is, movably in the axial direction.

  When the distal end portion 11 of the seal stamp 1 is attached to the seal cap 2, as shown in FIG. 4B, the bulge portion 41 is deformed so as to be pressed against the outer peripheral surface 11b of the distal end portion 11 of the seal stamp 1. However, the dimension L4 in the axial direction of the retaining ring 4 extends by the amount of deformation of the bulging portion 41 at that time. Therefore, the axial play between the outer packet part 3 and the holding ring 4 can absorb the dimensional change of the holding ring 4, and an excessive force is applied to the tip 11 of the seal 1. Therefore, the seal cap 2 can be easily attached.

  As shown in FIG. 4A, when the tip 11 of the seal 1 is inserted into the seal cap 2 with the holding ring 4 attached to the outer packet part 3, the holding ring 4 is attached to the tip 11 of the seal 1. Since it protrudes inward from the outer peripheral surface 11b, each of the bulging portions 41 of the plurality of leg portions 44 is compressed by the outer peripheral surface 11b of the distal end portion 11 of the seal 1 as shown in FIG. Then, the deformation allowable space 41a is deformed so as to be crushed. The deformed bulging portion 41 can be brought into close contact with the outer peripheral surface 11b of the distal end portion 11 of the seal 1 so that the seal 1 is held, so that the seal cap 2 does not fall off the seal 1. . In particular, since each of the bulging portions 41 of the plurality of leg portions 44 is elastically deformed independently and the adjacent leg portions 44 are not buffered, there is no extremely large resistance, and the seal cap 2 is fitted to the seal 1. be able to.

  In addition, when a round mark is used as the seal 1 as in this example, a stable fitting is possible if there is a difference of 0.2 mm between the diameter of the bulging portion 41 and the diameter of the seal 1. Therefore, even when the outer packaging part 3 of the seal cap 2 expands and contracts due to the influence of moisture in the outside air as in the conventional case and a dimensional change occurs, the bulging part 41 in the retaining ring 4 of the seal cap 2 However, this can be absorbed and the state in which the seal cap 2 is always attached can be maintained.

  The bulging portion 41 of the holding ring 4 is provided in the middle portion of the holding ring 4 in the axial direction, but it may be provided near the distal end or the proximal end. In this example, the number of the bulging portions 41 is one. However, two or more bulging portions 41 may be provided, or the bulging portions 41 may be spirally provided. Further, it may be provided as an intermittent protrusion instead of being provided all around as in this example.

Further, in this example, the bulging portion 41 is integrally molded as a part of the holding ring 4, but is not limited to this, a portion for attaching to the inner peripheral surface 31 of the outer packet portion 3, The bulging part 41 may be formed separately.
Alternatively, the retaining ring 4 may be attached to the inner peripheral surface 31 of the outer packet part 3 by adhesion or uneven fitting without providing the retaining part 33 in the outer packet part 3 as in this example.

  In this example, the cut of the C-shaped ring of the ring body 4 is provided at a position where there is no slit 43 (that is, a position where both the leg portion 44 and the ring-shaped portion 45 are divided). It can also be provided at a position (that is, a position where only the ring-shaped portion 45 is divided).

DESCRIPTION OF SYMBOLS 1 Seal 11 Front end of seal 11a Mark 11b Outer peripheral surface of seal 2 Seal cap 3 Outer cover 31 Inner peripheral surface 32 Lid 33 Retaining part 4 Holding ring 41 Swelling part 42 Reference surface 43 Slit 44 Leg part 45 Ring-shaped part L3 Axial dimension between retaining part of lid and lid part L4 Axial dimension of retaining ring

Claims (2)

A seal cap that covers the tip of a seal with a seal surface at the tip,
The seal cap includes an outer packet part and a holding ring attached to the inner peripheral surface of the outer packet part,
The outer packet part has a cylindrical shape with a distal end closed by a lid part and a proximal end opened,
The retaining ring has a cylindrical shape with both ends open,
A bulging portion is integrally provided on the inner peripheral surface of the holding ring,
The bulging portion is one that protrudes inward from a reference surface that allows passage of the tip portion of the seal among the inner peripheral surface of the retaining ring,
When the seal cap is attached to the tip of the seal, the bulging portion is deformed by being pressed against the outer peripheral surface of the tip of the seal.
The holding ring is formed with a plurality of strip-shaped slits from the distal end toward the proximal end side with respect to the bulging portion, so that a plurality of leg portions adjacent to each other across the space by the slit, A seal cap comprising a ring-shaped portion connecting proximal ends, wherein at least a part of the bulging portion is provided on the leg portion. The bulging portion is formed by bulging a part of the holding ring inward, and is provided on the inner circumferential surface of the holding ring over the entire circumference.
On the base end side of the outer packet part, a retaining part that can come into contact with the base end of the ring-shaped part of the holding ring is provided,
The retaining ring is disposed between the retaining portion and the lid portion,
The width of the strip-shaped slit is larger than the thickness of the leg,
The seal cap according to claim 1, wherein the holding ring is a C-shaped ring having a cut at one place.

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