JP5085097B2 - inspection door - Google Patents

Description

  The present invention relates to an inspection port.

Conventionally, as an inspection port, what was indicated, for example in patent documents 1 is known. This conventional example is a ceiling inspection port, and has an outer frame attached to an opening formed on the ceiling surface, and an inner frame accommodated in the outer frame. The outer frame is formed with a flange on the outer periphery at the lower end, and the upper surface of the flange is brought into contact with the ceiling surface around the opening. On the other hand, a flange is also formed on the entire outer periphery of the lower end of the inner frame, and a packing is mounted on the upper surface of a horizontal plate that is wider than the flange of the outer frame. Another plate portion is formed so as to rise from the periphery of the portion. In a state where the inner frame is housed in the outer frame, the collar portion of the inner frame covers the collar portion of the outer frame, and the airtightness between the inner frame and the outer frame is maintained by packing.
Japanese Patent No. 2690281

  However, as shown in the above-described conventional example, if the collar of the inner frame protrudes outside the collar of the outer frame, the collar of the inner frame becomes an obstacle when a wallpaper is pasted around the inspection port. Workability becomes worse because it is necessary to open the inner frame and paste the wallpaper.

  Further, in order to prevent this, the following problems arise when the ridges of the inner frame are neatly stacked so as not to protrude from the ridges of the outer frame. In other words, as described above, when the inner frame is housed in the outer frame, there is a slight difference between the outer frame and the inner frame due to an open / close operation or the accumulation of error dimensions within the allowable range of each component. The gap between the inner frame and the inner frame tends to be irregularly displaced. This irregular displacement makes the overlapping of the flanges of the inner frame and the outer frame uneven, and if the part of the flange of the outer frame is exposed from the flange of the inner frame, the design of the inspection port is deteriorated. .

  The present invention has been made to eliminate the above-described drawbacks, and has an object of providing an inspection port with excellent interior workability and a good design.

According to the present invention, the object is
An outer frame 6 that projects from the outer frame main body 4 that is fixed to the peripheral edge of the opening 2 opened in the installation base 1 and forms the inspection opening 3 to the receiving flange 5 on the surface of the installation base 1;
An inner frame 8 that is loosely fitted in the inspection opening 3 and projects a flange 7 over the surface of the receiving flange 5;
The outer frame 6 and the inner frame 7 are formed so as to be rotatably connected by inserting a rotating shaft 12 formed in one of them into a bearing hole 13 formed in the other, and formed in the bearing hole 13. The rotary shaft 12 can be moved within the slide hole 13c to be relatively movable along the surface of the installation base 1.
Further, the receiving flange 5 covers a larger outer peripheral edge than the amount of relative movement between the outer frame and the inner frame, and is formed to have a dimension capable of projecting from the outer peripheral edge of the flange 7 toward the outside of the inspection opening 1. This is achieved by providing an inspection port that makes it difficult to discriminate the presence or absence of positional deviation of the inner frame 7 with respect to the outer frame 6 by exposure around the cover flange 7 of the receiving flange 5.
Moreover, according to the present invention,
An outer frame 6 that projects from the outer frame main body 4 that is fixed to the peripheral edge of the opening 2 opened in the installation base 1 and forms the inspection opening 3 to the receiving flange 5 on the surface of the installation base 1;
An inner frame 8 that is loosely fitted in the inspection opening 3 and projects a flange 7 over the surface of the receiving flange 5;
The receiving flange 5 protrudes outward from the covering flange 7 to be larger than the maximum positional deviation δ of the inner frame 8 in the inspection opening 3, and the receiving flange 5 is exposed around the covering flange 7 to expose the inner frame 8. It is also possible to provide an inspection port that makes it difficult to visually recognize the positional deviation with respect to the outer frame 6.

  According to the present invention, the outer frame body 4 that forms the inspection opening 3 therein has the receiving flange 5 that projects outwardly more than the cover flange 7 of the inner frame 8 that is loosely fitted in the inspection opening 3. It is formed. The amount of protrusion of the receiving flange 5 to the outside of the covering flange 7 is set to be larger than the maximum positional displacement amount δ of the inner frame 8 in the inspection opening 3, so that even if the inner frame 8 is displaced, The receiving flange 5 is always exposed on the outer periphery so as to be edged.

  The design discomfort due to the non-uniformity of how the receiving flange 5 and the covering flange 7 overlap is at least if either the receiving flange 5 or the covering flange 7 is not exposed unevenly at the periphery. Unless it is not easily felt, if the exposure at the periphery of the cover flange 7 of the receiving flange 5 is ensured, the design of the inspection port can be maintained substantially satisfactorily. Further, by exposing the cover flange 7 so as to border the periphery of the receiving flange 5, an aesthetic appearance such as a stepped border decoration appears.

  Therefore, according to the present invention, the cover flange 7 of the inner frame 8 is disposed inward of the receiving flange 5 of the outer frame 6, and the inner frame 8 can be attached even when wallpaper is applied with the peripheral edge aligned with the peripheral edge of the receiving flange 5. Since it is not necessary to remove the wallpaper, the workability of pasting wallpaper can be improved. Even if the inner frame 8 is displaced, the edge of the cover flange 7 is secured by the receiving flange 5 so that the design of the inspection port is not substantially impaired. Can be improved at the same time, and management of the dimensional accuracy of the inspection port can be reduced. Furthermore, by extending the covering flange 7 of the inner frame 8 over the surface of the receiving flange 5 of the outer frame 6, packing or the like can be sandwiched between the flanges, and airtightness can be easily increased.

  The difference between the amount of protrusion of the receiving flange 5 to the outside of the cover flange 7 and the maximum amount of displacement δ in the inspection opening 3 of the inner frame 8 is easy to visually recognize the distance and discomfort when looking at the inspection port in normal times. It can be determined appropriately in consideration of the ratio and dimensions. For example, if it is a ceiling inspection port, it is a slightly distant distance that can be seen, so that the design can be improved without taking a relatively large difference between the overhang amount and the maximum positional deviation amount δ. If the positional deviation amount δ is a very small ratio with respect to the overhang amount, the positional deviation can hardly be distinguished.

  Further, if the guide portion 9 that guides the inner frame 8 to the center in the inspection opening 3, that is, a regular position is provided in the inspection opening 3, the exposed width of the receiving flange 5 is made substantially uniform around the periphery. It is possible to maintain the design of the inspection port higher. In this case, if the guide portion 9 is configured by an inclined surface that gradually approaches the inner wall surface of the inspection opening 3 as it goes in the opening operation direction of the inner frame 8, the opening and closing of the inspection port can be maintained smoothly.

  As is clear from the above description, according to the present invention, the interior workability is excellent, and an inspection port with a good design can be provided, and a better interior can be created.

  1 to 5 show an embodiment of the present invention. This embodiment shows a case where the present invention is applied to a ceiling inspection port, and the ceiling inspection port A includes an outer frame 6 fixed to a peripheral portion of the opening 2 opened in the ceiling (installation base 1), And an inner frame 8 mounted in the outer frame 6.

  As shown in FIG. 2, the outer frame 6 is a square frame in plan view formed by framing four frame members made of extruded aluminum, and an L-shaped corner piece is formed between the frame members. 6a is connected with a rivet from the outside. The outer frame 6 is formed by extending the receiving flange 5 outward from the lower end edge of the outer frame body 4 formed in a substantially cylindrical shape with vertical walls arranged in four directions so as to form a square in plan view.

The outer frame body 4 faces the parting of the ceiling 1 to be installed, and forms an inspection opening 3 in the interior. Formed into dimensions. A slot 27 for fitting and fixing the above-described corner piece 6a is formed on the outer peripheral surface, and a slot 27 ′ for supporting the suspension fitting 11 described later is formed on the inner peripheral surface. In addition, a pair of vertical walls facing each other is provided with a bearing opening 13 through which the rotary shaft 12 connected to the inner frame 8 is passed at a position near the end close to one adjacent vertical wall. The bearing port 13 has an inverted J shape as shown in FIG. 4A and the like, and has a large-diameter insertion hole 13b at the edge of the long hole 13a along the longitudinal direction of the vertical wall. A slide hole 13c is provided so as to be folded back from the hole 13a on the vertical wall side at the above position and formed slightly shorter than the long hole 13a.

  The receiving flange 5 allows the inner frame 8 to be accommodated in the outer frame main body 4 by contact with a cover flange 7 described later, and is formed so as to protrude from the outer frame main body 4 at a right angle. The overhanging dimension from the outer frame body 4 is appropriately determined in consideration of the contact with the cover flange 7 and the role as a cosmetic material that hides the parting of the ceiling 1. In addition, a protrusion is formed on the upper surface to prevent displacement from the opening 2 of the ceiling 1, and outside the protrusion, as shown in FIG. The packing 14 is attached to the upper surface continuously in the circumferential direction.

  On the other hand, the inner frame 8 is a frame body in which four frame members made of an extruded product of aluminum are framed so as to be slightly smaller than the outer frame 6, and are fixed by rivets to connect the frame materials. The corner piece 8a to be performed is disposed on the inner side opposite to the outer frame 6. The inner frame 8 is for attaching an appropriate cover plate 15 such as a ceiling material in the inside so that the inspection opening 3 can be opened and closed. The inner frame 8 can be opposed to the inner surface of the outer frame body 4 so as to substantially overlap. The inner frame main body 16 has an inward shape, an inward flange 17 projecting inward from the lower end edge of the inner frame main body 16, and the above-described cover flange 7 projecting outward.

  The inner frame body 16 holds the cover plate 15 and conceals and protects the periphery of the cover plate 15. In this embodiment, the inspection opening 3 is rotated by rotation from the state accommodated in the outer frame body 4. In order to be able to open, the outer frame body 4 is formed in an outer size that can be spaced apart from the inner wall surface of the outer frame body 4 with a certain clearance in consideration of the rotation trajectory. In the plan view, the vertical walls are arranged in four directions so as to form a square, and the inner peripheral surface is formed with a slot 27 ″ for fitting and fixing the above-mentioned corner piece 8a, and the cover plate 15 is formed. An L-shaped presser fitting 18 for holding from above is attached.

  Corresponding to the arrangement of the bearing openings 13 in the outer frame main body 4, a rotation lever 19 is mounted on each outer surface of a pair of opposing vertical walls of the inner frame main body 16 so as to be vertically rotatable. As shown in FIG. 4A and the like, the rotary lever 19 has a crank-like shape in which the rotary shafts 12 and 12 'are erected in the opposite directions so as to shift the cores at both ends of the plate-like lever piece 19a. This is a member, and is arranged symmetrically with the inner frame body 16 so as to make a pair, so that each of the rotating shafts 12 and 12 rotates around the same straight line, and the other of the rotating shafts 12 and 12 is shifted from this straight line. The rotary shafts 12 ′ and 12 ′ are arranged on the same straight line.

The pair of rotating levers 19 rotate about a straight line perpendicular to each vertical wall to be mounted, and are connected to bearing openings 13 and 13 formed in a pair of opposing vertical walls of the outer frame body 4. By connecting the other rotary shafts 12 ' and 12', the inner frame body 16 can be rotated in a complex manner with the vertical wall at a specific position as the center with respect to the outer frame body 4. The

  Further, in order to control the rotation of the outer lever 6 with respect to the rotating lever 19, a pair of vertical walls perpendicular to the rotating shaft 12 by the rotating lever 19 of the inner frame body 16 is provided with a receiving bracket 20 on one side and on the other side. An opening / closing lever 21 is attached. As shown in FIG. 3 and the like, the bracket 20 has a horizontal piece 20b extending from the upper end of the fixed piece 20a fixed to the outer surface of the inner frame body 16 toward the outside of the inner frame body 16 at a right angle. It is formed by extending a guide piece 20c having a square shape outward from the tip of the horizontal piece 20b. A plurality of the metal fittings 20 are installed on the vertical wall of the inner frame body 16 so that the inclination of the inner frame 8 with respect to the outer frame 6 is prohibited.

  Further, as shown in FIG. 3 and the like, the open / close lever 21 is a tip of an operation shaft 21a extending from the screw-shaped head exposed on the lower surface of the inner frame body 16 to the upper side along the outer surface of the inner frame body 16, that is, the outer frame. The engaging piece 21b is formed in a position corresponding to the upper surface of the main body 4 so as to project in the orthogonal direction. By rotating the operation shaft 21a via the screw-shaped head, the position between the door closing position where the locking piece 21b jumps to the upper surface of the outer frame body 4 and the door opening position where the locking frame 21a retracts inward of the outer frame body 4 is obtained. Move with. The side edge of the locking piece 21b that protrudes toward the outer frame main body 4 is an inclined surface, and when the outer frame main body 4 is slightly shifted upward, the position can be corrected and locked. In FIG. 3, reference numeral 21 c denotes a screw receiver that rotatably fixes the operation shaft 21 a to the inner frame 8, and 21 d denotes an operation shaft stopper that fixes the operation shaft 21 a to the outer surface of the inner frame body 16.

  Further, the inward flange 17 supports the peripheral edge of the cover plate 15 and is formed so as to protrude perpendicularly from the inner frame main body 16. The overhang dimension is appropriately determined in consideration of the support of the cover plate 15 and the role as a cosmetic material that hides the parting of the cover plate 15. Further, in order to improve the airtightness by contact with the cover plate 15, as shown in FIG. 3 and the like, a packing 14 'is attached to the upper surface continuously in the circumferential direction.

  Further, the cover flange 7 enables the inner frame main body 16 to be accommodated in the outer frame main body 4 by contact with the receiving flange 5 described above, and from the inner frame main body 16 in the direction opposite to the inward flange 17. Overhang formed. The projecting dimension from the inner frame main body 16 is such that the inner frame main body 16 is displaced in the outer frame main body 4 due to the above-described clearance between the inner frame main body 16 and the outer frame main body 4, and the inner frame 8 and the outer frame 6. In consideration of the maximum amount of positional deviation δ determined based on the accumulation of dimensional errors within the allowable range required when assembling the single unit and the assembling thereof, at least the inner frame body 16 and the outer frame body 4 It is set to such an extent that the gap can be reliably hidden. In other words, in addition to the case where the clearance is uniformly formed around the inner frame body 16, this is also the case when the clearance that should originally be formed on the outside of each of the opposing vertical walls is biased to the outside of one of the vertical walls. The lower limit dimension is set so as to be at least twice the normal clearance and combined with the accumulation of dimensional errors.

  In addition, this overhanging dimension ensures that the outer peripheral edge of the receiving flange 5 is exposed between the outer peripheral edge of the cover flange 7 and the outer peripheral edge of the receiving flange 5, which protrudes to the surface of the receiving flange 5 by the above-described lower limit dimension. The upper limit dimension is set to The upper limit dimension is more than twice the normal clearance in consideration of the above-mentioned clearance deviation and the maximum positional deviation amount δ determined based on the accumulation of dimensional errors, and the interval obtained by adding the accumulation of dimensional errors to this The receiving flange 5 is determined to be secured between the peripheral edge of the receiving flange 5 and the peripheral edge of the covering flange 7, whereby the receiving flange 5 covers the peripheral edge more than twice the normal clearance than the peripheral edge of the covering flange 7, and Even if the inner frame 8 protrudes outward by a sum total of the accumulation of dimensional errors and the inner frame 8 is displaced with respect to the outer frame 6, the peripheral edge of the receiving flange 5 of the outer frame 6 is always bordered in a plan view. Exposure is ensured.

  Further, the upper surface of the cover flange 7, that is, the contact surface with the receiving flange 5, in order to improve the airtightness by contact with the receiving flange 5, as shown in FIG. The packing 14 ″ is attached continuously.

  In the outer frame 6 and the inner frame 8 described above, the outer frame rotation shaft 12 ′ of the rotation lever 19 of the inner frame 8 is inserted into the bearing opening 13 of the outer frame 6, and the outer frame 6 and the inner frame 8 are moved by the rotation lever 19. It is formed by being rotatably connected. As shown in FIG. 1A, the inner frame 8 has the receiving flange 5 and the cover flange 7 placed by placing the horizontal piece 20b of the receiving metal fitting 20 on the upper surface of the outer frame 6 and setting the opening / closing lever 21 to the closed position. 1 to maintain the housing posture in which the inner frame body 16 is housed inside the outer frame body 4, and the operation shaft 21a is rotated from here to bring the opening / closing lever 21 into the door opening position. As shown in (b), it is possible to rotate to a projecting posture perpendicular to the outer frame 6, and these postures correspond to the closing and opening of the inspection opening 3 by the cover plate 15.

  At this time, as shown in FIG. 1 and FIG. 5B, the rotating lever 19 includes the receiving flange 5 and the receiving flange 5 from the end of the vertical wall of the inner frame 8 to which the lever piece 19a is mounted in the storage posture. It rotates from a substantially parallel posture to an orthogonal posture in the projecting posture, and the outer frame rotation shaft 12 'is moved in the slide hole 13c to rotate the lever piece 19a and rotate the outer frame in the slide hole 13c. Due to the displacement of the relative positions of the rotation axes 12 of the inner frame 8 and the outer frame 6 due to the sliding of the shaft 12 ′, the rotation trajectory of the inner frame 8 is reduced. In addition, the guide piece 20c of the metal fitting 20 is in sliding contact with the upper surface and the inner surface of the outer frame body 4 in an oblique direction toward the inside of the inner frame body 16 as the inner frame body 16 rotates. Smooth rotation of the inner frame 8 along a small rotation locus.

  A detailed description will be given below of the installation and opening / closing operation of the ceiling inspection opening A configured as described above to the opening 2 of the ceiling 1. When attaching the ceiling inspection opening A, an opening 2 is opened in the ceiling 1 and, at the same time, an inner frame 8 and an outer frame 6 are formed by framing the frame material carried into the construction site, and these are formed in the opening 2. It is made fixed.

  First, the opening 2 is opened in the ceiling 1, the frame material is assembled to form the inner frame 8, and a piece of ceiling material that substantially matches the size of the opening 2 generated when the opening 2 is opened in the ceiling 1 is formed. A lid plate 15 formed by adjusting the dimensions as appropriate is fixed inside the inner frame 8. The cover plate 15 is surrounded by the inner frame body 16 at the periphery, is supported by the inward flange 17 at the periphery, and the upper surface is pressed by the pressing metal fitting 18. The packing 14 ′ is crushed by pressing by the presser fitting 18, and airtightness between the lid plate 15 and the inner frame 8 is ensured.

  As shown in FIG. 3, the ceiling inspection opening A is attached to the opening 2 of the ceiling 1 by suspending and fixing the outer frame 6 to the periphery of the opening 2 by the above-described hanging metal fitting 11 as shown in FIG. The hanging bracket 11 is appropriately fixed to the back of the ceiling 1 via a mounting channel or the like (not shown) on the field edge 22. This hanging metal fitting 11 supports a support plate 11c inserted into a slot 27 'inside the outer frame body 4 via an inverted J-shaped relay fitting 11b attached to a fan fan bolt 11a fixed to the field edge 22. Thus, the outer frame 6 is suspended and fixed. By extending the receiving flange 5 in advance to the surface of the ceiling 1 at the periphery of the opening 2, if the fan fan 11 a is turned and the relay fitting 11 b is lifted upward, the packing 14 on the receiving flange 5 is placed between the ceiling 1 surface. The airtightness between the outer frame 6 and the ceiling 1 is ensured.

  The attachment of the outer frame 6 to the periphery of the opening 2 is performed in parallel with the work of forming the outer frame 6 by framing the frame material, and the rotary lever 19 attached to the inner frame 8 at the time of this framing. The outer frame rotating shaft 12 ′ is inserted into the slide hole 13 c from the insertion port 13 b of the bearing port 13 and is locked to the outer frame 6. As a result, as shown in FIG. 3, the outer frame 6 is completed at the same time as the frame is completed, and the outer frame 6 is fixed to the periphery of the opening 2, and the inner frame 8 is rotatable relative to the outer frame 6. It is connected and can be opened and closed simultaneously with the completion of the ceiling inspection opening A.

The ceiling inspection port A is closed by pushing the inner frame 8 into the outer frame 6 until the cover flange 7 and the receiving flange 5 come into contact with each other after the open / close lever 21 is in the open position. . In this state, when the rotary lever 19 is set to the closed position, the inner frame body 16 receives the upper surface thereof, the horizontal piece 20b of the metal fitting 20 and the locking piece 21b of the opening / closing lever 21 cover the lower surface and is sandwiched between the flanges 7 The frame 8 maintains the stowed posture, and at this time, the packing 14 ″ is crushed between the cover flange 7 and the receiving flange 5 to ensure the airtightness between them. When shifting to the stowed posture, the lever 20 and the slide hole 19 are slid in advance by locking the bracket 20 to the upper surface of the outer frame main body 4 in a state where the inner frame 8 is inclined with respect to the outer frame 6 during the transition. The inner frame 8 can be easily placed in the stowed posture by appropriately restraining the irregular rotation trajectory due to 13c.

  In the stowed position, the peripheral edge of the receiving flange 5 of the outer frame 6 is exposed from the tip of the covering flange 7 of the inner frame 8, and the flange 7 covers the periphery of the square cover plate 15 on the indoor side. In addition, a design with high design that the periphery of the covering flange 7 receives the edge of the flange 5 appears. The inner frame 8 may be displaced in the outer frame 6 due to the clearance between the outer frame 6 and the presence of the slide hole 13c and the accumulation of dimensional errors within the allowable range of each component. Since the amount of protrusion of the inward flange 17 from the cover flange 7 is larger than the maximum positional deviation amount δ, the edging is ensured.

  On the other hand, the procedure for opening the ceiling inspection opening A is sufficient if the procedure is the reverse of the above, and if the opening / closing lever 21 is operated, the inner frame 8 shifts from the stowed position to the protruding position due to its own weight. Depending on the length of the lever piece 19a of the rotary lever 19, the rotation trajectory of the inner frame 8 becomes smaller, and the inner frame 8 in the protruding posture approaches the end of the outer frame 6 and the inspection opening 3 becomes larger.

  In this embodiment, a guide portion 9 is formed on the inner surface of the outer frame body 4 in order to further reduce the above-described maximum positional deviation amount δ. The guide portion 9 has an inclined surface 23 that protrudes inward as it goes from the protruding posture side of the inner frame 8 to the storage posture side, that is, upwards of the outer frame body 4, and the inner frame 8 is inspected by the inclined surface 23. Guide to the center of the opening 3 for use. The guide portion 9 is formed by attaching a guide body 24 inside the outer frame body 4.

  As shown in FIG. 4, the guide body 24 includes the inclined surface 23 that is inclined so as to gradually protrude inwardly from the lower side of the outer frame body 4 toward the upper side, and the upper end of the inclined surface 23. Is a block-like member that forms a flat surface 25 extending in parallel with the inner wall surface of the inspection opening 3 inside the outer frame main body 4, and is formed by injection molding an appropriate elastic body such as a synthetic resin material. Further, the guide body 24 includes a spring piece 26 that protrudes inward of the plane 25 in a cantilever shape so as to extend the inclined surface 23 substantially. As shown in FIG. 4A and the like, the guide body 24 has upper and lower ends engaged with the slots 27 ′ inside the outer frame body 4, and a back surface bulge is formed in a mounting hole drilled in the outer frame body 4. The portion 24 a is fitted and fixed to the outer frame body 4.

  Therefore, when the inner frame 8 is displaced from the central portion of the outer frame main body 4 when changing from the projecting posture to the storage posture, the inclined surface 23 and the spring piece 26 of the guide body 24 are in sliding contact with the outer surface of the inner frame main body 16. The frame 8 is guided to the center of the outer frame main body 4. In the storage posture, the flat surface and the spring piece 26 restrict excessive displacement from the central portion of the inner frame main body 16.

  The guide body 24 described above is disposed at the open side edge of the outer frame body 4 by the inner frame 8, and as shown by a two-dot chain line in FIG. 4A, the guide body 24 is orthogonal to the rotation axis 12 permitted by the slide hole 13c. The direction shift is limited, and the outer frame main body 4 is also arranged on both edges of the rotary shaft 12 in the outer frame main body 4. As shown in FIG. Limit the deviation. In addition, when the inner frame 8 is shifted from the storage posture to the protruding posture, the spring piece 26 is temporarily bent, so that a slightly larger rotation locus of the inner frame 8 can be secured.

  Therefore, as shown in FIGS. 4A and 4B, the receiving flange 5 has a maximum displacement amount δ within the inspection opening 3 in a range where it does not abut against the spring piece 26, and the peripheral edge of the covering flange 7. Since the maximum amount of positional deviation is smaller than the protrusion amount D from the opening, the inspection flange A is always exposed to the outer periphery of the cover flange 7 in the closed state. Therefore, as shown in FIG. 5A, even if the inner frame 8 is slightly shifted to the left side of the page, the appearance of the inspection opening A from the indoor side is maintained well by the edging of the receiving flange 5 with respect to the cover flange 7. Thus, the positional deviation of the inner frame 8 in the inspection opening 3 is hardly noticed.

  In the above description, the case where the maximum misalignment amount δ is determined by accumulating dimensional errors within the allowable range of the parts such as the outer frame 6 is shown. However, the maximum misalignment amount δ is predicted based on experience. It is also possible to decide.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole perspective view which shows this invention, (a) is a figure which shows a door closed state, (b) is a figure which shows an open door state. It is a disassembled perspective view which shows this invention. It is principal part sectional drawing which shows the attachment state to a ceiling. It is a figure explaining the relationship between the position shift of an inner frame and exposure of a receiving flange, (a) is principal part sectional drawing of the orthogonal direction with respect to a rotating shaft, (b) is principal part sectional drawing of a rotating shaft direction. It is a figure which shows the relationship with an installation base, (a) is an external appearance of a closed state, (b) is principal part sectional drawing explaining the door opening operation | movement of an inner frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Installation base 2 Opening 3 Inspection opening 4 Outer frame main body 5 Receiving flange 6 Outer frame 7 Cover flange 8 Inner frame 9 Guide part δ Maximum displacement

Claims (2)

An outer frame that protrudes a receiving flange from the outer frame main body that is fixed to the periphery of the opening established in the installation base to form an inspection opening;
An inner frame that is loosely fitted in the inspection opening, covers the surface of the receiving flange, and projects the flange.
The outer frame and the inner frame are rotatably connected by inserting a rotating shaft formed on one of them into a bearing hole formed on the other, and rotate in a slide hole formed on the bearing hole. It can be moved relative to the surface of the installation base by moving the shaft,
And the said receiving flange is formed in the dimension which the outer peripheral edge is larger than the relative movable amount of an outer frame and an inner frame, and is dimensioned so that it can project toward the outer side of the inspection opening from the outer peripheral edge of the flange. Inspection port that makes it difficult to discern whether there is any displacement of the inner frame relative to the outer frame due to exposure around the cover flange.   The inspection port according to claim 1, wherein a guide portion is formed in the outer frame main body to guide the inner frame and to make the exposed width from the cover flange of the receiving flange substantially uniform around the inspection opening.

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