JP2010084927A - Gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasket, arranged so as to surround an opening, which can abut uniformly against an entire circumference when the opening of an airtight chamber is closed with a door or a cover. <P>SOLUTION: The gasket G includes a gasket body 10 fitted on either a first member with an opening or a second member for closing the opening, an air tight holding piece 20 whose apical end side 22 tilts in relation to the upper end surface 12a of the gasket body 10 and which extends from the gasket body 10 so as to contact a member opposite to the first member or the second member which are fitted on the gasket body 10, and a position holder 30 for coupling the gasket body 10 and an airtight holding piece 20 while allowing the apical end side 22 of the airtight holding piece 20 to approach the gasket body 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a main body having an opening and a door (or a lid) that closes the opening, and the opening is closed by the door, and the opening is closed by the door. The present invention relates to a gasket for sealing between the door and the main body around the opening and maintaining the sealed state of the hermetic chamber.

  Conventionally, the gasket of patent document 1 is known as a gasket. This gasket is attached along the peripheral edge of a rectangular opening formed in a main body such as a container, and when the opening is closed by a door (or lid), the main body and the door The space is sealed to maintain the airtight state of the airtight chamber of the main body.

Specifically, as shown in FIG. 11, the gasket is inserted into a fitting portion provided along the opening at the peripheral edge of the opening of a container or the like in a cross section (transverse cross section) in a direction orthogonal to the longitudinal direction. The engaging portion 102 to be locked, the gasket main body portion 104 formed with the hollow portion 104a, and an airtight holding piece (tongue piece) extending from the gasket main body portion 104 and curved in a direction covering the surface of the gasket main body portion 104. ) 106. When the opening of the main body is closed by the door, the airtight holding piece 106 can maintain the airtight state of the airtight chamber by contacting the door in an airtight state over the entire circumference of the opening. .
Japanese Patent Laid-Open No. 9-152037

  When the gasket 100 is attached so as to surround the rectangular opening, the gasket 100 must be bent at a right angle at the corner of the opening, and in this portion, as shown in FIG. The gasket main body 104 is deformed, whereby the airtight holding piece 106 is raised.

  That is, when the gasket 100 is attached along the rectangular opening, the airtight holding piece 106 is raised at the corners around the opening (see FIG. 12), and the airtight holding piece 106 is raised at other portions. This is a state where no occurrence occurs (position in the natural state: see FIG. 11).

  In Patent Document 1, it is described that the hermeticity of the airtight chamber can be maintained by raising the airtight holding piece 106 at the corner, but the door to which the gasket 100 is attached is described. Depending on the structure of the container and the purpose of use, the airtightness of the airtight chamber may not be maintained unless the contact state (per gasket) between the door and the like and the airtight holding piece 106 on the entire circumference of the opening is uniform.

  Therefore, in view of the above problems, the present invention provides a gasket contact of a gasket disposed so as to surround the opening when the opening of the hermetic chamber is closed by a door or a lid over the entire circumference of the opening. It is an object to provide such a gasket.

  Therefore, in order to solve the above problem, the gasket according to the present invention has a first member having an opening and a second member closing the opening, and the opening is closed by the second member. In order to maintain the airtight state of the hermetic chamber by sealing the space between the first member and the second member around the opening. A gasket having a length that can be disposed along the circumference of the first member, and is attached to one of the opening peripheral portion of the first member or the portion corresponding to the opening peripheral portion of the second member. A gasket main body portion having an upper end surface parallel to the attached portion at the end opposite to the attached portion, and an elastic body, and in the cross section at an arbitrary position in the longitudinal direction of the gasket, For the top surface The gasket body is inclined so that when the opening is closed, the inclined front end is in airtight contact with a member opposite to the first member or the second member to which the gasket body portion is attached. An airtight holding piece extending from the portion, and a position holding portion for connecting the gasket main body portion and the airtight holding piece while allowing the front end side of the airtight holding piece to approach the gasket main body portion. .

  According to such a configuration, when the opening is closed, the front end side of the hermetic holding piece is in contact with the member on the opposite side of the first member or the second member to which the gasket main body is attached, and the first member The tip of the airtight holding piece that is about to return to the natural state by its elastic force when the gap between the first member and the second member is narrowed and the airtight holding piece is pushed down to the gasket main body side. The first member or the second member in contact with the side and the tip end side are in close contact with each other, and the airtight state of the airtight chamber is maintained.

  Further, in the corner portion of the opening when the opening has a polygonal shape or the like, the gasket main body portion is bent along the corner portion so that the airtight holding piece is placed on the upper end surface of the gasket main body portion. On the other hand, when the user tries to get up from the position in the natural state, the rising is stopped by the position holding portion. Therefore, when the opening is closed, the contact state between the airtight holding piece and the first member or the second member, that is, the gasket contact is uniform over the entire circumference of the opening.

  In the present invention, the position in the natural state means the position of the airtight holding piece in a natural state where no force is applied to the airtight holding piece.

  In the gasket according to the present invention, the position holding portion is formed of an elastic body, and the upper end surface of the gasket main body portion and the distal end side of the airtight holding piece so that an intermediate portion thereof is bent or curved in the cross section. The structure which connects the surface which faces the said upper end surface of is preferable.

  By being configured in this manner, the position holding portion pulls the airtight holding piece when the airtight holding piece is about to rise from the position in the natural state to suppress the rising, while the tip of the airtight holding piece In order to make the first member or the second member in contact with the side and the tip side closer, the space between the first member and the second member is narrowed so that the tip side of the airtight holding piece is This pushing down is not hindered when pushing down to the gasket body side.

  That is, when the airtight holding piece tries to get up from a position in a natural state, the upper end surface and the surface facing the upper end surface are connected to each other by the position holding portion, and thus are pulled by the position holding portion, While the rising of the airtight holding piece from the natural state is suppressed, the distance between the first member and the second member is narrowed so that the front end side of the airtight holding piece is pushed down to the gasket main body side. The position holding portion does not become a tension rod when it is bent (the surfaces approach each other), and is bent at the intermediate portion along the transverse section, so that the push-down is not hindered.

  In addition, since the position holding portion is formed of an elastic body, when it is bent (elastically deformed) as described above, it comes into contact with the first member or the second member that comes into contact with the tip end side to return to the original position. Since the front end side of the airtight holding piece is pressed, the airtightness is further improved.

  The position holding portion is continuous in the longitudinal direction of the gasket, and the position holding portion communicates with a hollow portion surrounded by the position holding portion, the gasket main body portion, and the airtight holding piece, and the outside. Is preferably formed.

  As described above, when the gasket is attached to the first member or the second member, the position holding portion is continuous in the longitudinal direction of the gasket. Even in the position, the rising of the airtight holding piece from the natural state position on the front end side is suppressed.

  In addition, since the communication portion allows air to enter and exit from the outside, the air in the hollow portion can be expanded or contracted by heating or cooling the air in the hollow portion depending on the ambient temperature. As a result of entering and exiting from the communication portion, deformation of the gasket is suppressed.

  In addition, since the communication part is formed only in the position holding part, it is possible to suppress the deformation of the gasket due to the atmospheric temperature without causing a decrease in the airtightness and strength of the airtight holding piece and the gasket body part. It becomes.

  The gasket main body has an insertion piece to be inserted into an opening peripheral edge of the first member or a groove-shaped recess provided along the corresponding portion of the second member. The piece may be provided with an engaging portion that protrudes in a direction intersecting with the insertion direction into the groove-shaped recess and engages with a protrusion protruding into the groove-shaped recess.

  According to such a configuration, the engaging piece is engaged with the protruding portion in the concave portion by inserting the insertion piece into the groove-shaped concave portion, and the gasket main body portion is the first member or the Since it is attached to the second member, it is not necessary to attach it by bonding or rivets, and the gasket can be easily attached to and detached from the first member or the second member.

  As mentioned above, according to this invention, when the opening of an airtight chamber is obstruct | occluded with a door or a lid | cover, the gasket contact of the gasket arrange | positioned so that the said opening may be enclosed becomes uniform over the perimeter of the said opening. Such a gasket can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 8B below.

  FIG. 1 is a front view of the gasket. The rear view is omitted because it appears symmetrically with the front view of FIG. 2A is a left side view of the gasket, FIG. 2B is a reference view using an intermediate omission, and FIG. 2C is a right side view of the gasket. Fig.3 (a) is a top view of a gasket, FIG.3 (b) is a bottom view of a gasket. FIG. 4 is an enlarged front view of the gasket. FIG. 5A is an enlarged left side view of the AB portion, and FIG. 5B is an enlarged right side view of the AB portion. FIG. 6A is an enlarged plan view of the AB section, and FIG. 6B is an enlarged bottom view of the AB section. Fig.7 (a) is CC sectional drawing, FIG.7 (b) is DD sectional drawing. FIG. 8A is a reference diagram showing a use state of the gasket, and FIG. 8B is a reference diagram showing a gasket attachment state. In addition, the gasket which concerns on this embodiment continues only in right and left in the left view of Fig.2 (a).

  The gasket G according to this embodiment shown in FIG. 1 to FIG. 8B is used in an environmental test apparatus 50 for performing an environmental test such as a reliability test (see FIG. 8A). The environmental test apparatus 50 includes a test tank (first member) 54 having an opening 52 and a door (second member) 56 that closes the opening 52, and the opening 52 is closed by the door 56. A tank internal space (airtight chamber) S is formed. In this embodiment, the gasket G is attached to the door 56 of the environmental test apparatus 50, and when the opening 52 of the test tank 54 is closed by the door 56, the door 56, the test tank 54, The space is sealed to maintain the airtight state of the in-tank space S (see FIG. 8B). The gasket G has a length that can be disposed along the periphery of the opening 52 in order to maintain an airtight state around the opening 52.

  The gasket G may be attached to the opening peripheral edge 54 a of the test tank 54 instead of the door 56. The gasket G may be attached to any tank having a chamber that is airtightly closed with a member such as a lid, and is not limited to the environmental test apparatus 50.

  Hereinafter, the gasket G will be specifically described. Note that directions (up and down, left and right, etc.) in the following description are based on FIG.

  The gasket G is formed of an elastic material (elastic body), and is formed of silicon rubber in the present embodiment. As shown in FIG. 4, the gasket G connects the main body (gasket main body) 10 attached to the door 56, the airtight holding piece 20 extending from the main body 10, and the main body 10 and the airtight holding piece 20. The position holding unit 30 is provided, and is integrally formed by injection molding, press molding, or the like. The gasket G is in the longitudinal direction at an arbitrary position in the longitudinal direction of the gasket G (a direction orthogonal to the paper surface in FIG. 4) except for a position where a communication hole (communication portion) 34 of the position holding unit 30 described later is provided. The cross-sectional shape in the direction orthogonal to the shape is the same as the shape in the front view (FIGS. 1 and 4).

  The main body 10 is provided with a reference portion 12 on which the airtight holding piece 20 and the position holding portion 30 are provided, and a portion (attachment) corresponding to the opening peripheral portion 54a of the test tank 54 in the door 56. A portion) 56a (see FIG. 8A) has an insertion portion (insertion piece) 14 that is detachably attached.

  The reference portion 12 extends horizontally or substantially horizontally toward the left side in FIG. 4 and has an upper end surface 12a at the upper end. The airtight holding piece 20 extends upward from the base portion (right end portion in FIG. 4) of the reference portion 12, and the insertion portion 14 extends downward. Further, the position holding portion 30 extends upward from the tip end portion (left end portion in FIG. 4) of the reference portion 12, and the tip end side (left end edge in FIG. 4) is bent downward. .

  The insertion portion 14 includes a hanging portion 14b extending so as to hang from the reference portion 12 by a predetermined distance, and a distal end portion 14a extending so as to be parallel or substantially parallel to the reference portion 12 from the lower end of the hanging portion 14b toward the left side. Have The distal end portion 14a of the insertion portion 14 gradually decreases in thickness from the middle toward the distal end, and an engagement portion 16 is provided at the distal end.

  The engaging portion 16 protrudes in a direction that intersects the direction (horizontal direction) in which the distal end portion 14a of the insertion portion 14 extends. Specifically, the engaging portion 16 is a portion extending from the distal end of the insertion portion 14 toward the upper right.

  The airtight holding piece 20 is a part extending from the main body 10 (reference part 12) to the opening peripheral edge 54a side of the test tank 54 when the main body 10 is attached to the door 56 of the environmental test apparatus 50. An inclined portion 22 that is inclined with respect to the reference portion 12 (upper end surface 12a) of the main body portion 10 is provided on the tip side. When the opening 52 of the test tank 54 is closed by the door 56, the inclined portion 22 is a portion that is inclined with respect to the opening peripheral edge 54a of the test tank 54 and is in contact with the opening peripheral edge 54a in an airtight state. Yes (see FIG. 8B). Specifically, the airtight holding piece 20 includes an airtight holding piece base 24 that extends upward (horizontally) along the reference portion 12 after extending a predetermined distance upward from the base portion (right end portion) of the reference portion 12, and this airtight holding. And an inclined portion 22 extending obliquely from the tip of the one base portion 24 to the upper left. The connection position of the airtight holding piece base 24 and the inclined portion 22 is a position corresponding to the approximate center of the reference portion 12 in the horizontal direction of FIG.

  The inclined portion 22 is formed so as to become thinner toward the tip, and is substantially orthogonal to the inclined portion 22 in the vicinity of the connection position with the airtight holding piece base 24 on the upper surface (the surface opposite to the surface facing the reference portion 12). A rising portion 26 extending in the direction is provided, and a plurality of (three in FIG. 4) grooves m along the longitudinal direction are provided on the lower surface (the surface facing the reference portion 12).

  The position holding portion 30 is a portion that connects the main body portion 10 and an intermediate portion of the airtight holding piece 20 while allowing the distal end side (inclined portion 22) of the airtight holding piece 20 to approach the main body portion 10 (reference portion 12). is there. Further, the position holding part 30 is also a part that suppresses the rising of the airtight holding piece 20 with respect to the reference part 12 on the distal end side. Specifically, the position holding portion 30 connects the reference portion 12 and the inclined portion 22 such that the lower end is joined to the tip portion of the reference portion 12 and the upper end is joined to the inclined portion 22 of the airtight holding piece 20. is doing. Specifically, the position holding unit 30 includes a front end side portion of the surface (upper end surface) 12a facing the inclined portion 22 of the reference portion 12 and an airtight holding piece base portion 24 side portion of the surface 22a facing the reference portion 12 of the inclined portion 22. Are linked. The upper end of the position holding unit 30 may be connected to the tip end side as long as it is on the surface 22a of the inclined part 22 facing the reference unit 12. The lower end of the position holding unit 30 is the upper end surface of the reference unit 12. If it is on 12a, it may be connected to the base side.

  The position holding portion 30 is bent at its intermediate portion. In the present embodiment, the intermediate portion of the position holding portion 30 is bent so as to bulge toward the outside of the hollow portion 32 surrounded by the reference portion 12, the airtight holding piece 20, and the position holding portion 30. However, it is not limited to this, and it may be bent so as to bulge inward. The bent portion is not limited to the position of the present embodiment, and may be on the upper end side (inclined portion 22 side) or on the lower end side (reference portion 12 side). Moreover, the position holding part 30 may be curved so that the intermediate part bulges in an arc shape toward the inside or the outside.

  As shown in FIGS. 2A, 5, 7 A and 7 B, the position holding unit 30 is provided with a communication hole 34 for communicating the hollow portion 32 with the outside. ing. In the present embodiment, a plurality of communication holes 34 are provided at regular intervals in the longitudinal direction (see FIG. 2B).

  The gasket G configured as described above is attached to a portion (attachment portion) 56a corresponding to the opening peripheral edge portion 54a of the test tank 54 in the door 56 as shown in FIGS. 8 (a) and 8 (b).

  The attachment portion 56a of the door 56 has an attachment member 58, and the attachment member 58 forms a groove-like attachment recess 60 into which the insertion portion 14 of the gasket G is inserted. Specifically, the attachment member 58 is attached to the door 56 so as to surround the periphery of the opening (in this embodiment, a rectangular opening) 52 when the door 56 closes the opening 52 of the test tank 54. A groove-shaped mounting recess 60 that is recessed in the radial direction of the opening 52 is formed between the edge on the space S side (the right edge in FIG. 8B) and the door 56. The mounting recess 60 is formed so as to surround the opening 52 along the opening 52. When the insertion portion 14 of the gasket G is inserted into the mounting recess 60, the engagement portion of the insertion portion 14 is formed. The protrusion part 62 engaged with 16 protrudes (refer FIG. 10).

  The distal end portion 14a of the insertion portion 14 of the gasket G is inserted (press-fitted) into the mounting recess 60 configured as described above. Then, in a state where the engaging portion 16 is folded toward the distal end portion 14 a of the insertion portion 14, the distal end portion 14 a of the insertion portion 14 enters the mounting recess 60, and the engaging portion 16 engages with the protruding portion 62. Thus, the gasket G is locked (see FIG. 10).

  When attached to the door 56 in this way, in the gasket G according to the present embodiment, the reference portion 12 of the airtight holding piece 20 (see FIG. 8A) is also provided by the position holding portion 30 at the corner C of the opening 52 (see FIG. 8A). The rising of the upper end surface 12a) is suppressed.

  Specifically, when the opening 52 is polygonal (rectangular in the present embodiment) and has corners, when the gasket G is attached so as to surround the opening 52, the corners of the opening 52 In C, the main body portion 10 is bent along the corner portion C (in FIG. 10, the main body portion 10 is bent to the right side), so that the airtight holding piece 20 rises from a natural state position with respect to the reference portion 12. I will try. That is, when the main body portion 10 is bent so that the base side of the reference portion 12 faces the inside of the opening 52, the airtight holding piece 20 tends to rise. In this case, for example, as shown in FIG. 9, if the position holding unit 30 is not provided, the airtight holding piece 20 rises greatly from the position NP in the natural state to the position SP2 in the raised state. However, as with the gasket G of the present embodiment shown in FIG. 10, by providing the position holding portion 30, the airtight holding piece 20 is suppressed from being slightly raised from the natural state position NP to the position SP <b> 1.

  Specifically, since the upper end surface 12a of the reference portion 12 and the surface 22a facing the upper end surface 12a of the inclined portion 22 are connected to each other by the position holding portion 30, the airtight holding piece 20 rises from the natural position NP. When trying to do so (when the inclined portion 22 is going to be separated from the reference portion 12), the position holding portion 30 pulls the airtight holding piece 20 from the natural position NP, and the rising is suppressed. Therefore, the airtight holding piece 20 is in a natural or substantially natural position over the entire circumference of the opening 52, and when the opening 52 is closed by the door 56, the airtight holding piece 20 over the entire circumference of the opening 52. The contact state between the (inclined portion 22) and the opening peripheral edge portion 54a of the test tank 54, that is, the gasket contact is uniform. As a result, the airtight state of the tank space S is suitably maintained.

  Further, in the gasket G, since the position holding portion 30 is continuous in the longitudinal direction, the position holding portion 30 suppresses the rising of the airtight holding piece 20 at any position in the longitudinal direction. Even if the part is attached to the corner C of the opening 52, the rise of the airtight holding piece 20 at the corner C is suppressed.

  As described above, the gasket G attached to the door 56 seals the space between the attachment portion 56a of the door 56 and the opening peripheral edge 54a of the test tank 54 as described below, and makes the internal space S airtight. .

  When the door 56 to which the gasket G is attached is closed, the inclined portion 22 of the airtight holding piece 20 contacts the opening peripheral portion 54a of the test tank 54. When the door 56 is further closed and the space between the door 56 and the opening peripheral edge 54a of the test tank 54 becomes narrow, the inclined portion 22 of the airtight holding piece 20 is pushed down toward the reference portion 12 by the opening peripheral edge 54a of the test tank 54. It is. Since the airtight holding piece 20 is formed of silicon rubber (elastic body), it is elastically deformed and pushed down so that the inclined portion 22 is bent. At this time, the inclined portion 22 is easily bent because a plurality of grooves m along the longitudinal direction are provided on the surface 22 a side facing the reference portion 12.

  The inclined portion 22 of the airtight holding piece 20 pushed down in this way is brought into close contact with the opening peripheral portion 54a of the test tank 54 in an airtight state by trying to return to the natural state position by its elastic force. The airtight state of the tank space S is maintained.

  Further, when the door 56 is closed as described above, the position holding unit 30 does not prevent the inclined unit 22 from approaching the reference unit 12. That is, the position holding unit 30 uses the inclined part 22 as a reference by narrowing the gap between the door 56 and the opening peripheral part 54a of the test tank 54 in order to make the inclined part 22 and the opening peripheral part 54a of the test tank 54 more closely contact each other. When pushing down to the part 12 side, this pushing-down is not disturbed. Specifically, when the interval between the door 56 and the opening peripheral edge portion 54a of the test tank 54 is narrowed and the inclined portion 22 of the airtight holding piece 20 is pushed down to the reference portion 12 side, the position holding portion 30 is a tension rod. In other words, the position holding portion 30 does not prevent the pushing-down operation because the bent portion is bent at the bent middle portion. In addition, since the position holding portion 30 is formed of silicon rubber, when it is bent (elastically deformed) as described above, the inclined portion 22 is pressed against the opening peripheral portion 54a of the test tank 54 to return to the original position. Airtightness is further improved.

  In the environmental test apparatus 50, the environmental test is performed on the sample by changing the temperature in the tank space S while maintaining the airtight state of the tank space S. At this time, the gasket G is exposed to high or low temperature air in the tank space S. Therefore, this heat is transmitted to the hollow portion 32, and the air in the hollow portion 32 becomes high temperature or low temperature and expands or contracts. Thus, even if the air in the hollow portion 32 is expanded or contracted by being heated or cooled depending on the ambient temperature, the air in the hollow portion 32 enters and exits from the communication hole 34, thereby suppressing the deformation of the gasket G. Thereby, the airtightness between the door 56 and the opening peripheral edge 54a of the test tank 54 is maintained. As a result, the airtight state of the tank space S is suitably maintained regardless of the temperature (air temperature) in the tank space S. In addition, since the communication hole 34 is formed only in the position holding portion 30, it is possible to suppress the deformation of the gasket G due to the atmospheric temperature without causing a decrease in the airtightness and strength of the airtight holding piece 20 and the main body portion 10. Become.

  In addition, the gasket G of this invention is not limited to the said embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

  For example, in the present embodiment, the position holding unit 30 is provided so as to be continuous in the longitudinal direction of the gasket G, but the present invention is not limited thereto, and the gasket G is provided on the peripheral edge 54 a of the door 56 or the test tank 54. The position holding part 30 should just be provided in the site | part located in the corner | angular part C of the opening 52 at least. Even in such a configuration, the rising of the airtight holding piece 20 from the natural position relative to the reference portion 12 at the corner portion C of the opening 52 is suppressed by the position holding portion 30, and the entire circumference of the opening 52 is covered. The gasket contact is uniform.

  Further, the position holding unit 30 may be provided intermittently in the longitudinal direction.

It is a front view of the gasket which concerns on this embodiment. (A) in the gasket which concerns on the same embodiment is a left view, (b) is a reference figure which omitted the part between communication holes in order to show the arrangement state of a communication hole, (c) is It is a right view. (A) in the gasket which concerns on the same embodiment is a top view, (b) is a bottom view. It is an enlarged front view of the gasket which concerns on the same embodiment. (A) in the gasket which concerns on the same embodiment is an AB section enlarged left side view of Drawing 2 (a), and (b) shows an AB section enlarged right side view of Drawing 2 (a). (A) in the gasket which concerns on the same embodiment is an AB section enlarged plan view of Drawing 2 (a), and (b) is an AB section enlarged bottom view of Drawing 2 (a). (A) in the gasket which concerns on the same embodiment is CC sectional drawing of Fig.5 (a), (b) is DD sectional drawing of Fig.7 (a). (A) in the gasket which concerns on the same embodiment is a reference figure which shows the use condition at the time of attaching to an environmental test apparatus, (b) is a reference figure which shows the state attached to the environmental test apparatus. It is a figure which shows the rising state of the airtight holding piece when the gasket which concerns on the embodiment is attached to the corner | angular part of opening. It is a figure which shows the rising state of the airtight holding piece when the gasket which removed the position holding part from the gasket which concerns on the same embodiment is attached to the corner | angular part of opening. It is a front view of the conventional gasket. It is a figure which shows the rising state of the airtight holding piece when the conventional gasket is attached to the corner | angular part of opening.

Explanation of symbols

10 Body (gasket body)
12a Upper end surface 14 Insertion part (insertion piece)
16 Engagement part 20 Airtight holding piece 22 Inclined part (tip side of airtight holding piece)
22a Surface 30 facing the upper end surface of the inclined portion Position holding portion 32 Hollow portion 34 Communication hole 50 Environmental test device 52 Opening 54 Test tank (first member)
54a Opening peripheral edge 56 Door (second member)
56a Mounting part (part corresponding to the peripheral edge of the opening)
60 Mounting recess (groove-shaped recess)
62 Protrusion C Corner of opening G Gasket S Space in tank (airtight chamber)

Claims (4)

A first member having an opening; and a second member that closes the opening; and the opening is closed by the second member to form an airtight chamber. A gasket having a length that can be disposed along the periphery of the opening in order to seal the space between the first member and the second member and maintain the hermetic state of the hermetic chamber,
It is attached to one of the opening peripheral edge part of the first member or the part corresponding to the opening peripheral edge part of the second member, and is parallel to the attached part at the end opposite to the attached part. A gasket main body having an upper end surface;
In the cross section at an arbitrary position in the longitudinal direction of the gasket, the front end side is inclined with respect to the upper end surface, and the inclined front end side of the gasket body portion is closed when the opening is closed. An airtight holding piece extending from the gasket main body so as to be in airtight contact with a member opposite to the attached first member or second member;
A gasket comprising: a position holding portion that connects the gasket main body portion and the airtight holding piece while allowing the front end side of the airtight holding piece to approach the gasket main body portion.   The position holding portion is formed of an elastic body, and in the cross section, a surface facing the upper end surface of the gasket main body portion and the upper end surface on the front end side of the airtight holding piece so that an intermediate portion thereof is bent or curved. The gasket according to claim 1, wherein the gaskets are connected.   The position holding portion is continuous in the longitudinal direction of the gasket, and the position holding portion communicates with a hollow portion surrounded by the position holding portion, the gasket main body portion, and the airtight holding piece, and the outside. The gasket according to claim 1, wherein the gasket is formed.   The gasket main body has an insertion piece that is inserted into an opening peripheral edge of the first member or a groove-shaped recess provided along the corresponding portion of the second member. 2. An engaging portion is provided that protrudes in a direction intersecting with the insertion direction into the groove-like recess and engages with a protrusion protruding into the groove-like recess. 4. The gasket according to any one of 3 above.

Images