JP3518943B2 - Hollow elastic gasket for hatch cover - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow elastic gasket for a hatch cover, which is mainly used at a joint portion of a hatch cover used for ships and the like and seals between the two.

[0002]

2. Description of the Related Art Generally, a hatch cover for a ship is equipped with a sealing mechanism for press-contacting an upper end portion of a hatch combing to seal the hatch, and a rubber gasket is widely used for this purpose. .

3A and 3B are views showing an example of a rubber gasket often used in cargo ships, FIG. 3A is a perspective view showing the appearance of a sponge gasket 50, and FIG. ) Is a partial cross-sectional view showing a hatch portion to which this gasket is attached. The sponge gasket (50) shown in FIG. 3 has a structure in which an elongated rubber sponge (51) on the inside is joined to a skin (52) made of a rubber material having a thickness of about 3 mm to cover the same. As shown in the figure, the hatch cover (1) is installed in the accommodation groove (3) between the protruding pieces (1a, 1a) that are formed to project downward at a predetermined interval on the lower edge of the hatch cover (1), and when the hatch is closed, the upper part of the hatch (2) is It is compressed by the compression bar (2b) formed on the upper surface of the plate-shaped portion (2a), and airtightness is maintained by the reaction force of the rubber sponge (51).

When the hatch cover is large in size, the sponge gasket of FIG. 3 may not be able to absorb the relative displacement (longitudinal and lateral sliding) with the compression bar due to rocking of the ship. Also, depending on the structure of the hatch portion, the relative displacement with the compression bar cannot be completely absorbed. Therefore, for such applications, a hollow elastic gasket (hereinafter also simply referred to as a gasket) as shown in the external perspective view of FIG. 4 (a) is adopted. The hollow elastic gasket (10 ') of FIG. 4 is formed to have a desired length by joining members formed of a rubber material and having a hollow portion (12) formed in a long cross-section and having a constant cross section. The cross section is continuous from the U-shaped part that is the upper part in the figure and its both ends, and projects diagonally downward and the tip top part (1
It has a substantially pentagonal frame shape in which the protruding parts joined together in 1b) are integrated, and the middle part of both side parts (11c) of the U-shaped part is a straight mating side bottom surface layer part (11a).

This hollow elastic gasket (10 ') is shown in FIG.
As shown in the partial sectional view of (b), the projecting pieces (1a, 1a) projecting downward at a predetermined interval on the peripheral edge of the lower surface of the hatch cover (1).
It is fitted and mounted in the accommodation groove (3) part between them, and the tip top part (11b) is pressed against the flat plate part (2a) above the hatch coaming to keep the hatch part airtight by the reaction force of compression. Although the engagement of the gasket with the housing groove (3) is retained by the elastic force and frictional force of the both side parts (11c), the mating side bottom surface layer part (11a) is more securely attached. Adhesive is applied to adhere to the bottom of the housing groove (3).

By the way, in general, a hollow elastic gasket is required to have a specified finished dimension in order to be stably mounted in a housing groove (gasket groove). With a conventional hollow elastic gasket having a cross-sectional shape as shown in Fig. 4 (a), if the extrusion manufacturing method (vulcanization in steam can or simultaneous vulcanization by UHF) is applied, the dimensional tolerance is about ± 5%. This is a finished product, the required dimensional stability cannot be obtained, and this low cost extrusion method cannot be used. Therefore, for the hollow elastic gasket, the secondary joint lengthening of the press vulcanized product by the mold or the feed vulcanization manufacturing method by the press mold is exclusively used, which has been an obstacle to the reduction of the manufacturing cost.

[0007]

DISCLOSURE OF THE INVENTION The present invention takes into consideration the present situation that the production of a hollow elastic gasket as described above is inevitably dependent on the production method using a costly mold, and the product is expensive. The hollow elastic gasket structure that can achieve the sufficient sealing characteristics required for the finished dimensional accuracy by the low cost extrusion manufacturing method was newly proposed.
The purpose is to supply an inexpensive hollow elastic gasket produced by an extrusion method.

[0008]

In order to achieve the above object, the present invention provides a hatch (2) and a hatch cover (1) for ships and the like.
The hatch (2) is used by being fitted in the downwardly facing storage groove (3) extending around the lower surface of the hatch cover (1).
In the hollow elastic gasket for a long hatch cover that is pressed against the upper flat plate portion (2a) to seal, the accommodation groove (3)
A bent portion (11d) that protrudes inward in a fold shape and extends in the longitudinal direction is formed on the bottom surface layer portion (11a) on the fitting side with.

Further, the fitting-side bottom surface layer portion (11a) is formed in a convex shape which is inclined in the width direction toward the central portion in the longitudinal direction and protrudes outward.

[0010]

DETAILED DESCRIPTION OF THE INVENTION

[Embodiment] A hollow elastic gasket for a hatch cover according to the present invention will be described below in detail based on an embodiment with reference to the accompanying drawings. Each of FIGS. 1 (a) to 1 (c) shows an embodiment (10A) of a hollow elastic gasket for a hatch cover of the present invention.
(a) is an external perspective view, (b) is a cross-sectional view, and (c) is a partial cross-sectional view of the hatch portion showing its usage state. The same (d) in FIG. 1 shows a sectional view of another embodiment.

Hollow elastic gasket for illustrated hatch cover
(10A) has a constant cross-sectional shape (described later) in which a hollow portion (12) is provided using a rubber material such as natural rubber or synthetic rubber, and is formed by a long and inexpensive extrusion method. Even with a relatively large finished size tolerance (dimensional tolerance) due to the extrusion method, there is no problem in actual use because the configuration (cross-sectional shape) described below is adopted. Of course, a plurality of members having a predetermined length may be joined to form a desired length. This gasket (10A) is also as shown in Fig. 1 (c).
As shown in the cross-sectional view of the hatch section of the hatch cover (1), the hatch cover (1) is fitted into a downwardly extending storage groove (3) that extends around the lower surface of the hatch cover (1). )
It is pressed against and is sealed by the reaction force.

The cross-sectional shape of this hollow elastic gasket (10A) has a generally U-shaped portion (11A), which is the upper side in the figure, and a diagonally downward projection from both ends thereof, and a tip top (11A).
The protrusion-like parts (11B) joined together in b) are integrated into a substantially pentagonal frame shape, and the middle part of both side parts (11c) of the U-shaped part is the fitting-side bottom surface layer part (11a).

Particularly, in the present invention, the fitting side bottom surface layer portion (11
A bent part (11d) that protrudes inward in a fold shape and extends in the longitudinal direction.
Is formed so that the width W of the hollow elastic gasket can be changed with a slight force. Generally, a gasket and a housing groove (groove:
In 3), the finished size is manufactured within the specified size tolerance. The table below shows the most extreme cases that can be taken when combining the two.

[0014]

[Table 1]

The gasket of the embodiment can be installed without a gap between the gasket and the groove even if the width of the gasket itself or the gasket groove varies to some extent. That is, first, in order to guarantee the sealing performance, when the finished width dimension W of the gasket is smaller than the hollow elastic gasket tolerance lower limit and the width of the accommodation groove (groove: 3) for accommodating the gasket is the upper limit tolerance, that is, In the table, the width dimension W is designed (dimension setting) so that there is no gap even in the case of the combination of (C) (Fig. 1 (b)).
reference).

Further, in the case of the combination (b) in the above table, the hollow elastic gasket (10A) has the front part so that the smallest accommodation groove is combined with the largest gasket so that the gasket can be fitted without any trouble at this time. The fold width t of the fold-like bent portion (11d) is determined to be larger than this maximum compression amount so that the maximum compression amount in the case of (b) in the table can be absorbed. The hollow elastic gasket (10A) of the embodiment designed in this way has a fold (bent portion) on the bottom surface to increase the tolerance in the direction of the maximum tolerance, so that a large tolerance can be set after all, so the manufacturing method thereof As a result, an inexpensive extrusion manufacturing method can be adopted. In actual use, the ease of insertion work equivalent to or more than that using a mold is obtained and sufficient sealing performance is exhibited.

By the way, as shown in FIG. 2 (a), when the hollow elastic gasket is fitted and fitted in the accommodation groove (3), the engagement with the accommodation groove (3) is caused by the elastic force of the both side portions (11c). However, in order to secure the attachment more securely, an adhesive material is applied to the bottom layer (11a) on the fitting side and adhered to the bottom of the housing groove (3). However, as shown in Fig. 2 (b), the gasket fitted in the receiving groove (3) is always compressed in the width direction to some extent, but the bottom layer (11a) on the mating side of the gasket has a distance. Attempts to lift by h (the amount of lift) may result in poor adhesion stability and peeling of the bond. The present invention also proposes a structure for preventing the bottom portion from rising.

In order to prevent the bottom surface from rising, in the present invention, the bottom surface on the fitting side is provided with a central convex slope. That is, the fitting-side bottom surface layer portion (11a) is formed in a convex shape that is inclined in the width direction toward the central portion in the longitudinal direction and protrudes outward. Figure 1 (d) shows
It is sectional drawing which shows one Example of such a gasket.
The schematic structure of the hollow elastic gasket (10B) in the figure is the same as the previous example.
Similar to (10A), the fitting-side bottom surface layer portion (11a) is provided with a bent portion (11d) similar to that already described in the central portion. In this gasket, especially when the bottom layer (11a) on the mating side is in the normal state (before mounting), the left and right flat parts (layers) in the widthwise central part in the longitudinal direction are inclined in the widthwise direction from the left and right toward the central part. Then, it is formed in a shape protruding outward in a convex shape.

The degree of the inclination is determined by the bottom layer portion (11a) on the fitting side.
If the length H taken in the fitting direction between the top of the surface and the left (or right) edge is taken as the amount of inclination, the amount of inclination H is given in the table above.
The amount of uplift that can be calculated as corresponding to the case of (b) (see FIG. 2 (b)) should be the same as or slightly larger than that, which effectively suppresses uplift. Even if the bottom surface layer (11a) on the fitting side is inclined, the pressing force (compressing force) applied from the inclined apex and the side wall of the groove ( 1a, 1a) does not return to a convex shape due to frictional force, and after installation, the entire bottom surface remains flat and the receiving groove
(3) The bottom surface of (3) will not come into contact with the adhesive and will not come off.

In addition to the embodiments described above, for example, a plurality of bent portions (folds) may be provided to obtain the same function, but the manufacturing and design become complicated. Normally, sufficient performance can be obtained by providing one bent portion.

[0021]

As described above, according to the present invention,
In a hollow elastic gasket for a hatch cover that is fitted and mounted in a housing groove of a hatch cover of a ship or the like, a bent portion that protrudes inward in a fold shape and extends in the longitudinal direction is formed in a bottom surface layer portion on the fitting side with the housing groove. By adopting the structure, a larger dimensional tolerance than before can be allowed, and therefore, it is possible to manufacture by an inexpensive extrusion manufacturing method, and it is possible to obtain an effect of greatly contributing to the cost reduction of the hollow elastic gasket. Since it is deformed in the width direction with a slight force, it can be easily inserted into the accommodation groove.
Further, in the case where the fitting-side bottom surface layer portion is formed in a convex shape that is inclined in the width direction toward the central portion in the longitudinal direction and protrudes outward,
Adhesion to the bottom surface of the housing groove is good and lifting of the bottom surface layer portion can be effectively prevented. Adhesion stability is improved when the adhesive layer is attached together, and the adhesive does not peel off, resulting in a long service life.

[Brief description of drawings]

FIG. 1 is an external perspective view (a) showing an embodiment of a hollow elastic gasket for a hatch cover of the present invention, respectively, and a sectional view.
(b), Partial sectional view (c) of the hatch portion and detailed sectional view (d) showing another embodiment.

FIG. 2 is a cross-sectional view (a) showing a state in which the hollow elastic gasket for a hatch cover of the present invention is attached to the accommodation groove portion of the hatch cover.
FIG. 6B is a sectional view (b) for explaining the deformed state of the gasket.

FIG. 3 is an external perspective view (a) illustrating a conventional sponge rubber gasket, and a partial cross-sectional view (b) of a hatch portion showing a usage state thereof.

FIG. 4 is an external perspective view (a) showing an example of a conventional hollow elastic gasket for a hatch cover, and a partial cross-sectional view (b) of the hatch portion showing a usage state thereof.

[Explanation of symbols]

(1)… Hatch cover, (2)… Hatch, (2a) ... Upper flat plate part, (3)… Accommodation groove, (10A, 10B) ... Hollow elastic gasket for hatch cover, (11a)… Bottom layer of mating side (11d)… Bent part.

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B63B 19/26 B65D 53/00 F16J 15/10

Claims (2)

(57) [Claims] 1. A hatch (2) and a hatch cover (1) for a ship, etc.
The hatch (2) is inserted into the downwardly facing storage groove (3) that is used between the hatch cover (1) and extends along the lower surface of the hatch cover (1).
In the long elastic hollow cover gasket that is pressed against the upper flat plate part (2a) to seal, a fold-like protrusion is formed inwardly in the bottom layer (11a) on the fitting side with the accommodation groove (3). A hollow elastic gasket for a hatch cover, characterized in that a bent portion (11d) extending in the direction is formed. 2. The fitting-side bottom surface layer portion (11a) is formed in a convex shape that is inclined in the width direction toward the central portion in the longitudinal direction and protrudes outward. Hollow elastic gasket for hatch cover.