JP5832685B1 - Cylindrical end sealing structure - Google Patents

Abstract

A structure is known in which a peripheral wall is deformed inward and another part is pressed, but it is difficult to ensure watertightness between the separate part and the peripheral wall, so waterproofing is required. It cannot be applied to a structure in which lids are attached to both ends of a casing of a lighting fixture. SOLUTION: The inner peripheral surface of the opening at both ends of the casing, which is a cylindrical body, is widened, and a step portion is formed to prevent the lid body from falling into the cylindrical body with the lid body fitted into the opening. In addition, the outer peripheral edge of the lid is raised to form a peripheral wall that faces the peripheral wall of the opening, and both the peripheral walls are heated and melted in a state where the peripheral wall of the opening and the peripheral wall of the cover are mutually aligned. The peripheral wall is welded, and the opening at the end of the cylindrical body is sealed with a lid. [Selection] Figure 3

Description

  The present invention relates to an end sealing structure for a cylindrical body in which an opening at an end of a long cylindrical body is sealed with a lid.

  As a lighting fixture in a kitchen or bathroom, a cylindrical body at least partially formed of a transparent resin is used as a casing, and a light emitting unit such as an LED is accommodated in the casing, and then both ends of the casing are sealed with lids. Something that stops.

  In such a lighting fixture, it is necessary to select a structure for attaching a lid to a casing that is a cylindrical body. As an example of such a structure, an annular peripheral wall is formed on the casing side, and the inside of the peripheral wall is formed. There is a structure in which a peripheral wall is deformed inward in a state in which another part that fits is set so that the separate part does not fall out of the peripheral wall (see, for example, Patent Document 1).

JP 2003-245976 (paragraph 0028, FIG. 12, FIG. 13)

  In the above-described conventional structure, the peripheral wall is only deformed inward and another part is pressed, so that it is difficult to ensure watertightness between the separate part and the peripheral wall. Since the lighting fixture is installed in a kitchen or bathroom, a high degree of watertightness is required between the cylindrical body and the lid, and thus the structure described in Patent Document 1 cannot be applied. .

  Then, this invention makes it a subject to provide the edge part sealing structure of the cylindrical body which can ensure watertightness between a cylindrical body and a cover body in view of said problem.

End sealing structure of the tubular body according to the present invention in order to solve the above problems, the opening of both ends of the resin cylindrical body, a resin having an inner peripheral shape and contour of the same shape of the opening while manufacturing of the lid is or write fitted to each of both openings, the structure in which the periphery of the rim and the lid of each opening to seal the both openings of the tubular body by the Rukoto melted to each other in only the dimensions of the total thickness of both the lid than the length of the cylindrical body is short sleeve is inserted into the tubular body, the lid on both end faces of the sleeve in a state of fitting the said lid to the opening body are rope line positioning of the cover relative to the tubular body by abutment, wherein the lid is welded to the tubular body with its positioning is performed.

  In the above configuration, since the peripheral wall of the opening on the cylindrical body side and the peripheral wall of the lid body are melted and welded to each other, no gap remains between them, and water tightness can be reliably ensured. The lid body is fitted into the opening of the cylindrical body and welded so that the mating surface of the lid body and the cylindrical body is not exposed to the outside. At this time, the lid body escapes into the cylindrical body. It is necessary not to. Although a step portion may be formed on the inner peripheral surface of the opening, since the processing man-hour is required, the sleeve is inserted into the cylindrical body to position the lid.

In addition, for example, the cylindrical body is made of a transparent resin material , and the sleeve is made of an opaque resin material , so that the degree of freedom in design can be increased.

  As is clear from the above description, the present invention can secure the watertightness between the cylindrical body having openings at both ends and the lid body by welding, and is applied to, for example, a lighting apparatus installed in a bathroom. Even in this case, water does not enter the cylindrical body from the welded portion.

The figure which shows the state which installed the lighting fixture to which this invention is applied in the kitchen The figure which shows the state of the opening before attaching a cover body The figure which shows the process of welding a cover body to a casing The figure which shows the state by which the cover body was welded to the casing Cross-sectional view of another embodiment

  With reference to FIG. 1, 1 is the lighting fixture by this invention, and is attached to the lower surface of the hanging cupboard L of a kitchen. The luminaire 1 has a cylindrical casing 2 in which the lower surface and the front side surface are transparent and the remaining two surfaces are formed of an opaque resin, and a pair of lid bodies 3 welded to both end surfaces of the casing 2. It consists of In addition, since this casing 2 is formed by extrusion molding, the cross-sectional shape is the same in any part.

  For this reason, when lids for closing the openings at both ends are attached, so as to prevent the lid from falling into the inside of the casing 2, a ridge is formed around the lid so that the heel engages with the end surface of the casing. Can be considered. However, if the lid is provided with a ridge in this way, the heel will be exposed at both ends of the casing 2 and the design will be impaired.

  Therefore, as shown in FIG. 2, a cylindrical sleeve 6 formed by extrusion molding as a separate body from the casing 2 was inserted into the casing 2. In this embodiment, since openings are formed at both ends of the casing 2, the length of the sleeve 6 is shorter than the length of the casing 2 by a dimension twice the thickness of the lid 3. . When the lid 3 is fitted into the opening of the casing, the lid 3 comes into contact with the end surface 61 of the sleeve 6 and the lid 3 is positioned at a predetermined position. Further, the peripheral edge 31 of the lid 3 was raised, and a peripheral wall 31 facing the peripheral wall 21 of the casing 2 in the state where the lid 3 was attached to the casing 2 was formed on the lid 3. Reference numeral 4 denotes a circuit board on which a plurality of LEDs 41 are mounted at a predetermined interval.

  Referring to FIG. 3, reference numeral 5 denotes a welding jig, which incorporates a ceramic heater (not shown), and is configured so that the jig 5 is heated by energizing the ceramic heater. The jig 5 is formed with a mold pressing portion 51, and is configured such that when the jig 5 is lowered from the state shown in (a), both peripheral walls 21 and 31 enter the mold pressing portion 51. .

  When the jig 5 is lowered while the jig 5 is heated, both the peripheral walls 21 and 31 are brought into contact with the embossed portion 51, and in this state, when waiting for a predetermined time, the upper end portions of both the peripheral wall portions 21 and 31 are melted. And both the surrounding wall parts 21 and 31 are welded mutually. Thereafter, energization of the ceramic heater attached to the jig 5 is stopped, the jig 5 is further lowered, and air is injected from the nozzle (not shown) into the jig 5 to cool the jig 5. As shown in FIGS. 4B and 4, the lid 3 is welded to the casing 2 over the entire circumference. A portion indicated by M is a portion where the casing 2 and the lid 3 are welded, and the watertightness between the casing 2 and the lid 3 can be ensured reliably.

  In the above embodiment, the casing 2 and the sleeve 6 are both formed of a transparent resin. However, when the inner peripheral surface of the casing 2 and the outer peripheral surface of the sleeve 6 are brought into close contact with each other, a minute gap generated between the two is formed. Newton rings may occur.

  Therefore, as shown in FIG. 5 (a), a protrusion 22 may be provided on the inner peripheral surface of the casing 2 so as to secure a gap having a size that does not cause Newton's rings. The protrusion 22 may be provided on the outer peripheral surface of the sleeve 6.

  Alternatively, a portion of the peripheral wall of the sleeve 6 that faces the LED 41 may be cut off at the end face 62 so that the light from the LED 41 transmits only the casing 2. In this case, an opaque resin can be used for the sleeve 6.

  Since the luminaire 1 can achieve perfect watertightness in this way, water can be completely prevented from entering the casing 2 even when installed in the bathroom or outdoors in addition to the kitchen. Moreover, in the said embodiment, although the case where the casing 2 was formed by extrusion molding and it had an opening in both ends was demonstrated, the casing which has a bottomed cylindrical body formed by injection molding has one piece which a casing has The above welded structure may be applied to the opening portion.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Casing 3 Lid 5 Jig 6 Sleeve 21 Perimeter wall 31 Perimeter wall

Claims (2)

The opening of both ends of the resin tubular body, in a state the cover body made of a resin is or write fitted to each of both openings having inner peripheral shape and contour of the same shape of the opening, the periphery of each opening in the structure and the peripheral edge of each lid seals the both openings of the tubular body by the Rukoto melted to each other, a short by the dimension of the total thickness of both the lid than the length of the cylindrical body sleeve is inserted into the tubular body, it is rope line positioning of the cover relative to the tubular body by the lid in both end faces of the sleeve in a state of fitting the said lid to the opening abuts An end sealing structure for a cylindrical body, wherein the lid body is welded to the cylindrical body in a state where the positioning is performed. The cylindrical body has been formed of a transparent resin material, the sleeve is cylindrical body end seal of claim 1, characterized in that one formed of an opaque resin material Construction.

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