JP5485746B2 - Opening lid mounting structure - Google Patents

Description

  The present invention relates to an opening lid mounting structure, and more particularly, to an opening lid mounting structure that allows a lid to be easily mounted without rattling even when there is some variation in the thickness of the opening edge. .

  2. Description of the Related Art Conventionally, a synthetic resin rainwater tank that stores rainwater taken from a gutter or the like has an opening formed in a tank top plate for the purpose of internal inspection or air venting, and a lid is attached to the opening. In that case, a structure as shown in FIGS. 14 and 15 is generally employed as the lid mounting structure.

  The lid attachment structure shown in FIG. 14 forms a small protrusion 100b having a roundness on the side surface of the convex portion 100a on the back surface side of the lid 100, and the convex portion of the lid 100 on the opening 101a of the top plate portion 101 of the rainwater tank. 100 a is fitted from above, and the lid 100 is attached to the opening 101 a so as not to be detached by sandwiching the mouth edge 101 b of the opening 101 a between the outer edge portion 100 c and the small protrusion 100 b of the lid 100.

  15 has a male screw 100e formed on the outer peripheral surface of the convex shaft portion 100d on the back surface side of the cover body 100, and a female screw 101c on the inner peripheral surface of the opening 101a of the top plate portion 101 of the rainwater tank. Is formed, and the convex body 100d of the lid 100 is screwed into the opening 101a so that the lid 100 is not detached from the opening 101.

  The prior art documents of the present invention were investigated, but no prior patent documents or the like describing related technologies likely to affect the novelty or inventive step of the present invention could not be found.

  nothing special.

  In the lid mounting structure shown in FIG. 14, if the thickness of the lip 101 b of the opening 101 a is the same as the distance from the back surface of the outer edge 100 c of the lid 100 to the small protrusion 100 b, the lid 100 is made into the opening 101 a. Can be installed reliably. However, large molded products such as synthetic resin rainwater tanks are often molded by a molding method such as rotational molding or blow molding, and in this case, the thickness of each part of the rainwater tank tends to vary. The wall thickness of the lip 101b of the opening 101a may vary somewhat. Thus, when the thickness of the lip portion 101b of the opening 101a varies, the thickness of the lip portion 101b is larger than the interval from the back surface of the outer edge portion 100c of the lid 100 to the small protrusion 100b. Since the outer edge portion 100c of the lid body 100c and the small protrusion 100b do not sandwich the mouth edge portion 101b of the opening 101a, it is difficult to securely attach the lid body 100 so as not to be detached. When the thickness is smaller than the distance from the back surface of the outer edge portion 100c of the lid 100 to the small protrusion 100b, it is difficult to attach the lid 100 to the opening 101a without rattling. In addition, this lid mounting structure also has a problem that it is not easy to remove the lid 100 from the opening 101a because the small protrusion 100b is hooked on the lip 101a of the opening 101a from below.

  On the other hand, in the lid attachment structure shown in FIG. 15, since the convex shaft portion 100d of the lid 100 is screwed into the opening 101a, the lid 100 can be attached to the opening 101a without rattling. If the thickness is small, the number of pitches of the female screw 101c that can be formed on the inner peripheral surface of the opening 101a is too small, which may hinder the screwing operation, and in order to form such a female screw 101c. Since insert molding is required, there is a problem that the cost is increased.

The present invention has been made under the circumstances described above, and the main problem to be solved is an opening that allows the lid to be attached to the opening without rattling, even if there is some variation in the thickness of the opening edge. An object of the present invention is to provide a lid mounting structure.
And in specific embodiment, it is also made into the subject that it is set as the cover body attachment structure excellent in the attachment workability | operativity which can be reliably attached to an opening by a very simple operation | work.

In order to solve the above-mentioned problem, the lid attachment structure of the opening according to claim 1 of the present invention is provided with an elastic body on the back surface of the lid covering the opening, and the opening edge is formed by the back surface of the lid and the elastic body. part is sandwiched, a lid mounting structure of apertures lid that is attached to the opening, along with the elastic body is formed in a substantially L shape from the vicinity of the center of the back surface of the lid, the When the lid is rotated at the front end of the substantially L-shaped elastic body and the opening edge is sandwiched between the back surface and the elastic body of the cover body, the opening edge is formed between the back surface of the cover body and the elastic body. A guide guide portion for guiding the guide body is formed, and the guide guide portion is formed by obliquely cutting off the lid rotation direction side portion of the distal end portion of the elastic body. .

Then, the lid mounting structure of the opening according to claim 2 of the present invention, the inventor smell according to the claim 1, the rear surface of the lid, the lid in contact with the inner surface of the opening when rotating the lid It is characterized in that a plurality of rotation guide portions that match the center portion with the center portion of the opening are formed,
According to a third aspect of the present invention, the lid mounting structure of the opening according to the second aspect of the present invention is the invention according to the second aspect , wherein all the rotation guide parts or a part of the rotation guide parts have the outer surface when the lid body has been rotated. Abuts against the inner surface of the opening and serves as both a detent and positioning means for the lid, and the outer surface of the rotation guide portion serving as a detent and positioning means for the lid contacts the inner surface of the opening, The lid body is characterized by being detented and positioned,
According to a fourth aspect of the present invention, there is provided a cover mounting structure for an opening according to the third aspect of the present invention, wherein the opening has a rectangular planar shape and is opened when the cover is rotated on the back surface of the cover. A pair of first rotation guide portions that respectively contact the inner surfaces of the opposing short sides and align the center portion of the lid with the central portion of the opening, and the inner surfaces of the opposing short sides of the opening when rotating the lid The center of the lid is aligned with the center of the opening, and when the lid has finished rotating, the outer surface comes into contact with the inner surfaces of the opposite short sides of the opening to prevent the lid from rotating. And a pair of second rotation guide portions that also serve as positioning means, and when rotating the lid, respectively contact the inner surfaces of the opposing long sides of the opening to align the center of the lid with the center of the opening, and When the lid has finished rotating, the outer side faces the inner side of the opposite long side of the opening. A pair of third rotation guide portions that are in contact with each other and serve as means for preventing rotation and positioning of the lid are formed, and the outer surfaces of the pair of second rotation guide portions and the pair of third rotation guides The outer surface of the part is in contact with the inner surface of the short side opposite to the inner surface of the opening and the inner surface of the long side opposite to each other, and the lid is prevented from being rotated and positioned. The “rectangular” opening includes a rectangular opening having rounded corners.

  As in the lid attachment structure of the opening according to claim 1, an elastic body is provided on the back surface of the lid that covers the opening, and the opening edge is sandwiched between the back surface of the lid and the elastic body. In the structure attached to the opening, even if there is some variation in the thickness of the lip of the opening, the elastic body deforms according to the thickness of the lip, and deforms with the back of the lid. Since the opening edge can be sandwiched between the elastic body and the lid, the lid can be securely attached so as not to be detached from the opening. In addition, since the back surface of the lid and the elastic body are pressed against both the front and back surfaces of the opening edge by the restoring force of the deformed elastic body, the backlash of the lid can be reliably eliminated.

And, since the elastic body is formed in a substantially L shape from the vicinity of the center of the back surface of the lid, by substantially the height how the L-shaped elastic body, the rim of the opening of the wall thickness variation The allowable range can be easily changed.

Also, since the guide information section at the distal end portion of the substantially L-shaped elastic body is formed, when to rotate the lid to sandwich the rim of the opening in the back surface and the elastic body of the lid, guide information parts by now the rim of the opening can smoothly and reliably guided between the back and the elastic body of the lid, easily the operation of mounting the lid.

Furthermore, when a plurality of rotation guide portions are formed on the back surface of the lid as in the lid attachment structure of the opening according to claim 2 , the rotation guide portion contacts the inner surface of the opening when the lid is rotated. Since the center of the lid is aligned with the center of the opening, the lid rotates around the center of the lid, and the center of rotation of the lid is fixed, further improving the mounting workability of the lid. To do.

In particular, as in the cover attachment structure of the opening according to claim 3 , when all the rotation guide parts or a part of the rotation guide parts have finished rotating the cover body, the outer surface comes into contact with the inner surface of the opening. If the outer surface of the rotation guide part, which also serves as a detent and positioning means for the lid, is in contact with the inner surface of the opening, the lid is detented. At the same time, the lid body is correctly positioned so that the center portion of the lid body and the center portion of the opening coincide with each other, and is securely attached and fixed to the opening.

And like the cover attachment structure of the opening which concerns on Claim 4 , an opening has a rectangular planar shape, A pair of 1st rotation guide part and the rotation stopper and positioning of a cover are formed in the back surface of a cover A pair of second rotation guide portions and a pair of third rotation guide portions are formed, and the outer surface of the second rotation guide portion and the outer surface of the third rotation guide portion are opposed to each other. When the lid is rotated and attached to the opening, the inner surface of the short side and the inner surface of the long side opposite to each other, the first, second, Since the lid can be smoothly rotated by the third rotation guide portion around its center portion as the center of rotation, it is easy to attach the lid, and when the lid has finished rotating, When the lid is prevented from rotating by the third rotation guide, The lid is correctly positioned so that the center of the lid coincides with the center of the opening, and is securely fixed so as not to be displaced in the front-rear and left-right directions (long side direction and short side direction of the opening). It will be.

It is a top view which shows the cover body attachment structure of the opening which concerns on one Embodiment of this invention. It is the sectional view on the AA line of FIG. It is a bottom view of the lid mounting structure It is a top view of the lid used for the lid attachment structure. It is a front view of the cover body. It is a right view of the same lid. It is a bottom view of the same lid. It is a bottom view which shows the place which loosely fitted the elastic body of the cover body to opening. It is a bottom view which shows the place which rotated the cover body to the middle. It is a bottom view which shows the place rotated just before completing the rotation of the cover body. It is an enlarged bottom view of the 3rd rotation guide part formed in the back surface of the cover body. It is explanatory drawing of the cover body attached to a perfect circle shape opening, Comprising: (a) shows the state which attached the lid body to the perfect circle shape opening, (b) shows the state in the middle of attaching a lid body. It is shown. It is explanatory drawing of the cover body attachment structure which concerns on other embodiment of this invention. It is explanatory drawing about an example of the conventional cover body attachment structure. It is explanatory drawing about the other example of the conventional cover body attachment structure.

  The lid attachment structure of the embodiment shown in FIGS. 1 to 3 includes a pair of elastic bodies 3 and 3 formed on the back surface of the lid 2 covering the rectangular opening 1, and the back surface of the lid 2 and the elastic bodies 3 and 3. The lid body 2 is attached to the opening 1 with the edge portions 4 and 4 along the long sides 1a and 1a of the opening 1 sandwiched between the front end portions 3a and 3a.

The lid 2 is a disc-like lid that is injection-molded with a thermoplastic resin such as polypropylene, polyethylene, hard polyvinyl chloride, ABS (acrylonitrile / butadiene / styrene), AES (acrylonitrile / ethylene propylene / styrene), and the like. 1, 4, and 6, the surface of the lid 2 has a finger when the lid 2 is rotated. A pair of projecting pieces 2a, 2a to be hooked are formed on both sides of the center point of the lid body 2 on the center line CL1 of the lid body 2 (center line in the direction perpendicular to both elastic bodies 3, 3).
The lid 2 may be in the form of a flat disk, or it corresponds to the case where the plate 40 (in this embodiment, the top plate portion of the rainwater tank) in which the opening 1 is formed is slightly curved. And it is good also as the disk shape curved slightly.

  As shown in FIG. 5, the pair of elastic bodies 3, 3 are formed in a substantially L shape from the vicinity of the center of the back surface of the lid body 2 toward the opposite sides. 3 a and 3 a are raised toward the back surface of the lid 2. The distance between the upper end surface of the rising ends 3a, 3a (hereinafter referred to as rising tips) of the elastic bodies 3, 3 and the back surface of the lid 2 is determined by the thickness of the edge portions 4, 4 of the opening 1. 2 is set to be slightly smaller, and therefore, in the state in which the edge portions 4 and 4 of the opening 1 are sandwiched between the rising tips 3a and 3a of the elastic bodies 3 and 3 and the back surface of the lid 2 as shown in FIG. The horizontal plates 3b and 3b of the elastic bodies 3 and 3 are elastically deformed so that they are slightly warped in a bow shape, and the upper end surfaces of the leading end portions 3a and 3a of the elastic bodies 3 and 3 and the back surface of the lid body 2 by the restoring force. Is in pressure contact with the front and back surfaces of the lip portions 4 and 4 so that the lid 2 can be attached to the opening 1 without rattling. When the rim portions 4 and 4 are large in thickness, the horizontal plate portions 3b and 3b of the elastic bodies 3 and 3 are elastically deformed so as to largely warp like a bow. When the wall thickness is small, the lateral plate portions 3b, 3b of the elastic bodies 3, 3 are hardly elastically deformed, and the lip portion is formed between the back surface of the lid body 2 and the leading end portions 3a, 3a of the elastic bodies 3, 3. 4 and 4, the lid 2 can be securely attached to the opening 1 even if the thickness of the rim portions 4, 4 varies slightly.

  Since the elastic bodies 3 and 3 are made of the above-described thermoplastic resin and formed in a substantially L shape integrally with the lid body 2, the thickness of the edge portions 4 and 4 of the opening 1 is increased as described above. Corresponding elastic deformation is possible, but in this embodiment, the horizontal plate portions 3b, 3b of the substantially L-shaped elastic bodies 3, 3 are made easier to be added to the root portions of the elastic bodies 3, 3. In order to reduce the load, as shown in FIG. 2, FIG. 7 and the like, rectangular opening portions 3d and 3d are formed in the horizontal plate portions 3b and 3b of the elastic bodies 3 and 3, respectively. Prevents breakage at the root.

  Both elastic bodies 3, 3 are formed so as to be point-symmetric with respect to the center point of the lid 2, and from the outer surface of the rising tip 3 a of one elastic body 3, the rising tip of the other elastic body 3 The distance to the outer surface of the portion 3a is shorter than the length of the long side 1a of the opening 1 (distance between the short sides 1b and 1b), and the length of the short side 1b of the opening 1 (long side 1a, It is set to be longer than the mutual distance 1a). Then, the lid rotation direction side portions of the rising tips 3a and 3a of the elastic bodies 3 and 3 are cut obliquely as shown in FIG. 6, and the rim 4 of the opening 1 is rotated when the lid 2 is rotated. , 4 are formed between the back surface of the lid 2 and the leading end portions 3a, 3a of the elastic bodies 3, 3 to guide guide portions 3e, 3e.

  For this reason, as shown in FIG. 8, when both the elastic bodies 3, 3 are parallel or nearly parallel to the long sides 1 a, 1 a of the opening 1 and the cover body 2 is placed over the opening 1, both elastic bodies 3 , 3 are loosely fitted inside the opening 1 and when the lid body 2 is rotated in the direction of the arrow X as shown in FIG. 9, the mouth edges 4, 4 along the long sides 1a, 1a of the opening 1 are elastic bodies. 3 and 3 are guided smoothly between the back surface of the lid 2 and the rising tips 3a and 3a of the elastic bodies 3 and 3 by the guides 3e and 3e of the rising tips 3a and 3a, as shown in FIG. When the lid body 2 has been rotated through about 90 ° to the end, as shown in FIG. The lid 2 is attached to the opening 1 with no rattling between the two.

  Further, as shown in FIG. 7, a pair of first rotation guide portions 5, 5, a pair of second rotation guide portions 6, 6, and a pair of third rotation guides are provided on the back surface of the lid 2. Portions 7 and 7 are formed.

  When the lid 2 is rotated as shown in FIG. 9, the pair of first rotation guide portions 5, 5 come into contact with the inner surfaces of the short sides 1 b, 1 b facing each other of the opening 1. 2 is controlled so as not to be displaced in the direction of the long side 1 b of the opening 1, and serves to match the center of the lid 2 with the center of the opening 1. As shown in FIG. 3, the first rotation guide portions 5 and 5 are arranged at the center of the lid body 2 on both sides of the center line CL1 of the lid body 2 (center line in the direction orthogonal to both elastic bodies 3 and 3). It is formed so as to be point-symmetric with respect to the point, and a line L connecting the tips of the rotation guide portions 5 and 5 contacting the inner surfaces of the short sides 1b and 1b of the opening 1 and a center line CL1 of the lid 2 The depression angle θ of the opening 1 approximates to the depression angle of the diagonal line of the opening 1 and the long side 1a (the error range is about ± 10 °), and the distance between the tips of the rotation guide portions 5 and 5 is the long side 1a of the opening 1 Is set equal to or slightly shorter than the length (the distance between the short sides 1b and 1b). The first rotation guide portions 5 and 5 of this embodiment are formed in the shape of elongated convex ribs parallel to the center line CL1 of the lid 2, but only the tip actually functions as a guide. For this reason, the overall shape of the first rotation guide portions 5 and 5 is not particularly limited, and may be formed, for example, as a small protrusion.

  Further, when the pair of second rotation guide portions 6 and 6 are rotated until just before the lid body 2 is completely rotated as shown in FIG. 10, the distal end of the guide portion on the rotation direction side is the short side 1 b of the opening 1. 1b, and the lid 2 is controlled so as not to be displaced in the direction of the long side 1a of the opening 1 so that the center portion of the lid 2 is aligned with the center portion of the opening 1, and FIG. As shown in the figure, when the lid body 2 has been rotated and attached to the opening 1, the outer surface of the guide portion abuts against the inner surfaces of the short sides 1 b and 1 b of the opening 1 to serve as both a detent and positioning means for the lid body 2. It is formed in a short convex rib shape perpendicular to the center line CL1 of the lid 2. As shown in FIG. 3, the second rotation guide portions 6 and 6 are positioned on the center line CL <b> 1 of the lid body 2 and are symmetric with respect to the center point of the lid body 2. The distance from the outer surface of one rotation guide portion 6 to the outer surface of the other rotation guide portion 6 is set to be the same as the length of the long side 1a of the opening 1 (the distance between the short sides 1b and 1b). ing.

  As shown in FIG. 5, the second rotation guide portions 6 and 6 are configured such that the height of the guide portion front end on the lid rotating direction side is high and the height of the rear end of the guide portion on the opposite side is low. In addition, the bottom surface of the guide portion is formed to be inclined. When the height of the rear end of the guide portion opposite to the lid rotation direction is high, when the lid body 2 is rotated in the opposite direction and removed from the opening 1, the rear edge of the guide portion is the rim 4, 4 of the opening 1. However, when the height of the rear end of the guide portion on the opposite side to the lid rotating direction is low as described above, the rear end of the guide portion is the edge 4 or 4 of the opening 1. Since it rides on the surface, the lid 8 can be easily rotated in the opposite direction and removed from the opening 1. The height of the rear end of the guide portion on the opposite side to the lid rotation direction is equal to or less than the gap when there is a gap between the front surface of the edge portions 4 and 4 of the opening 1 and the back surface of the lid body 2. The height may be set, and when there is no gap, the height may be set to zero.

  Further, when the pair of third rotation guide portions 7 and 7 are rotated until just before the lid body 2 is completely rotated as shown in FIG. 10, the distal end of the guide portion on the rotation direction side is the long side 1 a of the opening 1. 3a, and the lid 2 is controlled so as not to be displaced in the direction of the short side 1b of the opening 1 so that the center of the lid 2 is aligned with the center of the opening 1. As shown in the figure, when the lid body 2 has been rotated and attached to the opening 1, the outer surface of the guide part abuts against the inner surfaces of the long sides 1 a and 1 a of the opening 1 to serve as both a detent and positioning means for the lid body 2. It is formed in a slightly long convex rib shape parallel to the center line CL1 of the lid 2. The third rotation guide portions 7 and 7 are positioned on a center line CL2 (see FIG. 11) orthogonal to the center line CL1 of the lid 2 so as to be point-symmetric with respect to the center point of the lid 2. The distance from the outer surface of one rotation guide portion 7 to the outer surface of the other rotation guide portion 7 is the length of the short side 1b of the opening 1 (the distance between the long sides 1a and 1a). They are set the same.

  In the third rotation guide portion 7 in this embodiment, as shown in FIG. 11, the outer surface of the tip end portion of the guide portion closer to the lid body rotation direction than the center line CL2 of the lid body is formed on the convex curved surface 7a. . If the outer surface of the guide portion tip portion is a flat surface, the tip portion (especially the tip corner portion) of the rotation guide portions 7 and 7 hits the inner surface of the long sides 1a and 1a of the opening 1 when the lid body 8 is rotated. Although the body 8 may be difficult to rotate, when the convex body 7a is formed as described above, the convex surface 7a smoothly slides on the inner surface of the opening 1 when the lid body 2 is rotated. The lid 8 can be smoothly rotated to the end.

  Since the second rotation guide portions 6 and 6 are short in length and the guide tip end portion on the lid rotating direction side does not hit the inner surfaces of the short sides 1b and 1b of the opening 1 strongly, Although the side surfaces are flat, when the second rotation guide portions 6 and 6 are formed to have the same length as or longer than the third rotation guide portions 7 and 7, the lid is rotated in the same manner as described above. It is desirable to form the outer surface of the direction side guide portion tip portion into a convex curved surface.

In addition, when the length of the straight portion on the rear end side of the rotation guide portion 7 with respect to the lid body center line CL2 (the straight portion on the opposite side to the lid rotation direction) is short, the lid body 2 has been rotated by 90 °. However, since the contact length of the outer surface of the rotation guide portion 7 with respect to the inner surface of the long side 1a of the opening 1 is short and the rotation of the lid body 2 may be difficult to stop, the lid body of the rotation guide portion 7 The straight portion on the opposite side of the lid body rotation direction from the center line CL2 is made longer than the front end portion of the guide portion on which the convex curved surface 7a is formed so that the anti-rotation function of the lid body 2 can be exhibited more reliably. preferable.
Similarly, with respect to the second rotation guide 6 as well, the part on the opposite side (rear end side) of the lid body rotation direction from the center line CL1 of the lid body is made longer than the part on the lid body rotation direction side (front end side). You may make it able to exhibit the rotation prevention function of a body more reliably.

  On the other hand, the opening 1 is formed in a top plate portion 40 such as a rainwater tank obtained by molding a thermoplastic resin such as polypropylene or polyethylene by a method such as rotational molding or blow molding. There is usually some variation in the wall thickness of the rim 4 of the opening 1 formed in the plate 40.

In this embodiment, the planar shape of the opening 1 is a rectangle with rounded corners. However, the opening 1 has a long diameter and a short diameter. If it is a planar shape which can attach the cover body 2 with the mouth edge part sandwiched between the back surface of the elastic body 3 and the rising tips 3a and 3a of the elastic bodies 3 and 3, a regular polygon, a parallelogram, an ellipse and an oval Any plane shape may be used.
An opening without a major axis and a minor axis, such as a perfect circle, may be used. However, in that case, a certain condition is required for the method of attaching the lid body 2 and the elastic bodies 3 and 3; explain.

In the lid attachment structure of the opening according to the above embodiment, the lid 2 can be easily attached to the opening 1 without rattling in the following manner.
First, as shown in FIG. 8, the elastic bodies 3 and 3 on the back surface of the lid body 2 are placed in a state of being parallel or nearly parallel to the long sides 1a and 1a of the rectangular opening 1, and the lid body 2 is placed over the opening 1 to 3 and 3 are loosely fitted inside the opening 1. Then, when a finger is hooked on the protrusions 2a, 2a on the surface of the lid 2 and the lid 2 is rotated in the direction of the arrow X as shown in FIG. 9, the mouth along the long sides 1a, 1a of the opening 1 The edges 4 and 4 are smoothly guided between the back surface of the lid 2 and the rising tips 3a and 3a of the elastic bodies 3 and 3 by the guides 3e and 3e of the rising tips 3a and 3a of the elastic bodies 3 and 3. At the same time, the tips of the first rotation guide portions 5 and 5 are in contact with the inner surfaces of the short sides 1b and 1b of the opening 1 so that the lid 2 is not displaced in the direction of the long side 1b of the opening 1. Thus, the central portion of the lid 2 is aligned with the central portion of the opening 1. Further, when the lid body 2 is rotated until just before it is rotated as shown in FIG. 10, the lid body rotation direction side of each of the second rotation guide portions 6 and 6 and the third rotation guide portions 7 and 7. The front end of the opening 1 is in contact with the inner surfaces of the short sides 1b and 1b and the long sides 1a and 1a of the opening 1 so that the lid 2 is not displaced in the long side direction or the short side direction of the opening 1. Thus, the central portion of the lid 2 is aligned with the central portion of the opening 1. As described above, when the lid body 2 is rotated, even if the opening 1 has a rectangular planar shape, the lid body is formed by the first, second, and third rotation guide portions 5, 5, 6, 6, 7, and 7. The center portion of the lid 2 can be smoothly rotated with the center portion of the lid 2 as the center of rotation while matching the center portion of the opening 2 with the center portion of the opening 1.
Then, as shown in FIG. 3, when the lid body 2 has been rotated through about 90 ° to the end, the edge portions 4, 4 of the opening 1 are connected to the back surface of the lid body 2 and the elastic bodies 3, 3 as shown in FIG. 2. The back surface of the lid 2 and the elastic bodies 3, 3 are sandwiched between the rising tips 3 a, 3 a and are restored by the restoring force of the horizontal plates 3 b, 3 b of the elastic bodies 3, 3 that are elastically deformed so as to warp like a bow. The leading end portions 3a, 3a of the first plate are pressed against the front and back surfaces of the rim portions 4, 4 of the opening 1, and the lid 2 is attached to the opening 1 without rattling. At the same time, the outer surfaces of the second rotation guide portions 6 and 6 and the third rotation guide portions 7 and 7 are in contact with the inner surfaces of the short sides 1b and 1b and the long sides 1a and 1a of the opening 1, The lid body 2 is prevented from rotating, and the lid body 2 is correctly positioned so that the center portion of the lid body 2 and the center portion of the opening 1 coincide with each other, and the front and rear, right and left directions (long side direction and short side direction of the opening) It is securely attached and fixed so as not to be displaced.
Further, even if there is some variation in the thickness of the edge portions 4 and 4 of the opening 1, the horizontal plate portions 3 b and 3 b of the elastic bodies 3 and 3 are elastically deformed to be large or small like a bow correspondingly, and the lid Since the edge portions 4 and 4 can be sandwiched between the back surface of the body 2 and the rising tips 3 a and 3 a of the elastic bodies 3 and 3, the lid body 2 can be securely attached to the opening 1.

  As described above, the lid attachment structure of the opening according to this embodiment is a simple operation of simply rotating the lid 2 at a rotation angle of 90 ° or less with the central portion of the lid 2 as the rotation center. Even if there is some variation in the thickness of the edge portions 4 and 4 of the opening 1, there is a remarkable effect that the lid 2 can be accurately positioned and attached to the opening 1 without rattling.

  By the way, when opening has a perfect circular planar shape, the cover body 2 cannot be attached in said way. In this case, as shown in FIG. 12A, the dimension a from the outer surface of the vertical plate portion 3 c of the substantially L-shaped elastic body 3 to the inner peripheral surface 1 c of the opening 1 is set to the inner periphery of the opening 1. The dimension b is set larger than the dimension b from the surface 1c to the outer surface of the rising tip 3a of the elastic body 3, and as shown in FIG. 12 (b), the rising tip 3a of the elastic body 3 on one side and the lid 2 The lid body 2 is moved to one side with the lip 4 on one side of the opening 1 sandwiched between the back surface and the lid 2 is moved to the opposite side after the elastic body 3 on one side is fitted into the opening 1. If the lid body 2 is attached to the true circular opening 1 by sandwiching the mouth edge 4 on the opposite side of the opening 1 between the rising tip 3 a of the elastic body 3 on the opposite side and the back surface of the lid 2. Good.

In the lid mounting structure of the above embodiment, a substantially L-shaped elastic body 3 is integrally formed on the back surface of the lid 2, but is not limited to such an elastic body 3, Another elastic body may be provided on the back surface of the lid 2.
FIG. 13 shows a lid mounting structure of an embodiment in which such another elastic body 30 is provided on the back surface of the lid body 2, and a band plate 30 b whose both ends rise toward the back surface of the lid body 2. Is fixed to the lower end of the tension spring 30a (coil spring) to constitute the elastic body 30, and the upper end of the tension spring 30a of the elastic body 30 is fixed to the center of the back surface of the lid body 2, The lid 2 is attached to the opening 1 with the edge portions 4 and 4 of the opening 1 sandwiched between both ends of the band plate 30b.

  In such a lid mounting structure, even if there is some variation in the thickness of the edge portions 4 and 4 of the opening 1, the tension spring 30a of the elastic body 30 expands and contracts accordingly, and the restoring force causes the lid to Since the back surface of the body 2 and both end portions of the strip 30b of the elastic body 30 are pressed against both the front and back surfaces of the rim portions 4 and 4 of the opening 1 to sandwich the rim portions 4 and 4, the lid body 2 is surely secured without rattling. It can be attached to the opening 1. Further, if the first, second, and third rotation guide portions 5, 5, 6, 6, 7, and 7 are formed on the back surface of the lid body 2, the center portion of the lid body 2 is rotated about the rotation center. The lid 2 can be attached by positioning so that the center of the lid 2 and the center of the opening 1 coincide.

DESCRIPTION OF SYMBOLS 1 Opening 1a Long side of opening 1b Short side of opening 2 Lid body 3,30 Elastic body 3a Rising tip part 3b Elastic body horizontal plate part 3c Elastic body vertical plate part 3d Venting part 3e Guide guide part 4 Opening edge 5 First rotation guide 6 Second rotation guide 7 Third rotation guide

Claims (4)

An elastic body on the back surface of the lid for covering the opening is provided, the mouth edge of the opening in the back surface and the elastic body of the lid sandwiched in the lid mounting structure of apertures lid that is attached to the opening There,
The elastic body is formed in a substantially L shape from the vicinity of the center of the back surface of the lid body, and the lid body is rotated at the tip of the substantially L-shaped elastic body so that the back surface of the lid body and the elastic body A guide guide portion is formed that guides the mouth edge of the opening between the back surface of the lid and the elastic body when the mouth edge of the opening is sandwiched between
The opening guide body mounting structure is characterized in that the guide section is formed by obliquely notching a lid body rotation direction side portion of a distal end portion of an elastic body . The rear surface of the lid, according to claim 1, the rotation guide portion to align a central portion of the lid in contact with the inner surface of the opening when rotating the lid body in a central portion of the opening is characterized in that it is formed with a plurality Opening lid mounting structure. When all the rotation guide parts or a part of the rotation guide parts have finished rotating the lid body, the outer surface comes into contact with the inner surface of the opening, and serves as both a detent and positioning means for the lid body. 3. The lid of the opening according to claim 2 , wherein the outer surface of the rotation guide portion serving both as a detent and a positioning means abuts against the inner surface of the opening, and the lid is detented and positioned. Mounting structure. The opening has a rectangular planar shape, and when the lid is rotated, the opening contacts the inner surfaces of the opposite short sides of the opening so that the center of the lid is aligned with the center of the opening. When rotating the lid, the pair of first rotation guide parts are brought into contact with the inner surfaces of the short sides opposite to each other, the center of the lid is aligned with the center of the opening, and the lid is rotated. When finished, a pair of second rotation guide portions that serve as both a detent and positioning means for the lid body with the outer surfaces abutting against the inner surfaces of the opposite short sides of the opening, and the opening relative to each other when rotating the lid body The center of the lid is aligned with the center of the opening, and the outer surface is in contact with the inner surfaces of the opposite long sides of the opening. A pair of third rotation guide portions that serve as both a detent and positioning means for the lid And the outer surfaces of the pair of second rotation guide portions and the outer surfaces of the pair of third rotation guide portions on the inner surfaces of the short sides facing each other and the inner surfaces of the long sides facing each other, respectively. The opening lid body mounting structure according to claim 3 , wherein the lid body is in contact with and is prevented from rotating and positioned.

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