Inspection hatch

Abstract

To provide an inspection port in which a structure of a member interposed between an outer frame and an inner frame is further simplified while preventing a track at an end portion from turning around to a back face side when an inner frame is opened.SOLUTION: An inspection port comprises: a rectangular outer frame fixed to an opening provided in an installation surface; an inner frame installed inside the outer frame; a pair of hinge members connecting the outer frame with the inner frame and pivotally mounting the inner frame so as to rotate; and a cover member mounted inside the inner frame. The pair of hinge members are mounted in the vicinity of both ends of one side of the outer frame, and each of them includes: a mounted portion fixed in the vicinity of an end of the one side of the outer frame; a connecting portion in which an outer edge of the mounted portion is bent inward; a support portion extending from a front side end of the connecting portion in a front side direction when a side where the inside is opened is a front side and an opposite side to the front side is a rear side with respect to the installation surface; and a rotating shaft connecting the support portion with the inner frame.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an inspection hatch that is opened in an installation surface such as a wall or ceiling of a building. [Background technology]

[0002] Openable and closable inspection hatches are sometimes provided in the walls or ceilings of buildings to inspect structural or functional parts of the building that are normally invisible to building users (for example, ventilation, air conditioning, or electrical equipment). Inspection hatches typically have a rectangular outer frame, a rotatable inner frame that is pivoted along one side of the outer frame, and a lid that covers the inside of the inner frame. Examples of such inspection hatches include the technologies described in Patent Documents 1 and 2. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 60-37365 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-23869 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology described in Patent Document 1, the inner frame is directly attached to the shaft near one side of the outer frame, and when the inner frame is opened, the rotational orbit of the end of the frame on that side of the shaft wraps around to the back side of the inspection hatch. Therefore, if there is equipment, wiring, piping, or other facilities on the back side of the inspection hatch, there is a concern that the end of the frame may interfere with these facilities.

[0005] To address these concerns, the technology described in Patent Document 2 involves installing a connecting metal fitting between the outer frame and the inner frame, and moving the inner frame to the front side first before opening the door. However, the structure of the connecting metal fitting is complicated, and the opening method is also complicated.

[0006] An embodiment of the present disclosure aims to provide an inspection hatch that simplifies the structure of the members that connect the outer frame and inner frame, while preventing the end tracks from wrapping around to the back side when the inner frame is opened. [Means for solving the problem]

[0007] The inspection hatch of an embodiment of the present disclosure comprises a square outer frame fixed to an opening provided on an installation surface, an inner frame installed inside the outer frame, a pair of hinge members connecting the outer frame and the inner frame and rotatably axially supporting the inner frame, and a lid material attached to the inside of the inner frame, and the pair of hinge members are attached near both ends of one side of the outer frame, and each of them has an attachment portion fixed near the end of one side of the outer frame, a connecting portion in which the outer edge of the attachment portion is bent inward, a support portion extending from the front end of the connecting portion toward the front side when the side that opens to the inside is considered the front side and the opposite side is considered the back side relative to the installation surface, and a rotation axis connecting the support portion to the inner frame.

[0008] In this application, the term "installation surface" refers to, for example, a ceiling or a wall surface. The ceiling may be indoors or outdoors, such as under an eaves. The wall may be indoors or outdoors.

[0009] When an inspection hatch is installed on a ceiling, the front side of the installation surface means the bottom side, and the back side of the installation surface means the top side. When an inspection hatch is installed on a wall, the back side of the installation surface means the inside side of the wall, in other words, the side that cannot be seen when the inspection hatch is closed, and the front side of the installation surface means the opposite side.

[0010] In addition, in the inspection hatch of the present application, "inside" a certain part refers to the side closer to the center of that part, and "outside" a certain part refers to the side farther from the center of that part.

[0011] With the above configuration, the inner frame is not directly axially attached to the outer frame, but rotates around a rotation axis provided on a support part located relatively low in the hinge member, and since the portion of the inner frame located outside the rotation axis is short, it is possible to prevent the inner frame from wrapping around to the back side of the installation surface. Moreover, the position and shape of the hinge member itself do not change when the inner frame is opened, so the structure of the hinge member can be simplified.

[0012] In addition, in the above-mentioned inspection hatch, it is desirable that the inner surface of the support portion and the outer surface of the inner frame are in direct contact with each other and are fastened to each other by a rivet that serves as the rotation axis.

[0013] With the above configuration, the rotation axis is stiff when the inner frame rotates relative to the hinge member, so when attaching the inner frame to the outer frame via the hinge member, the inner frame is less likely to move, making the attachment work easier.

[0014] In addition, in the inspection hatch, it is desirable that a hook portion be provided on the rear edge of the mounting portion, which is folded outward and hooked to the outer frame. The hook portion may be hooked to the rear edge of the outer frame, or to a receiving member provided on the inner surface of the outer frame, for example.

[0015] With the above configuration, especially when the inspection hatch is installed in the ceiling, the mounting part can be secured to the outer frame with screws while the hook part is still engaged with the outer frame, making it easy to install the inner frame by one person.

[0016] Furthermore, in the inspection hatch, it is desirable that a hinge recess recessed outward is formed in a part of the inside of the support part, and the inner end of the rotating shaft is housed in the hinge recess.

[0017] With the above-described configuration, it is possible to prevent the inner end of the rotating shaft from interfering with the lid material, and it is not necessary to cut or grind the edges of the lid material when attaching the lid material to the inner frame. [Effects of the Invention]

[0018] Since the embodiments of the present disclosure are configured as described above, it is possible to provide an inspection hatch with a simpler structure for the members that connect the outer frame and inner frame, while preventing the end tracks from wrapping around to the back side when the inner frame is opened. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view showing the appearance of an inspection hatch according to a first embodiment. [Figure 2] 1 is a perspective view showing the inspection hatch of the first embodiment in an open state with a portion of the outer frame broken away. FIG. [Figure 3] 1 is a perspective view showing the closed state of the inspection hatch of the first embodiment with a portion of the outer frame broken away. FIG. [Figure 4] 1 is a plan view from above the ceiling showing the inspection hatch of the first embodiment installed in an opening on the installation surface. [Figure 5] 1 is a partial cross-sectional view showing the state before the inner frame of the inspection hatch of the first embodiment is attached to the outer frame. FIG. [Figure 6] FIG. 2 is a partial cross-sectional view showing the state in which the inner frame of the inspection hatch of the first embodiment has been temporarily fastened to the outer frame. [Figure 7] 1 is a partial cross-sectional view showing the state in which the inner frame of the inspection hatch of the first embodiment is attached to the outer frame. [Figure 8] 1A and 1B are cross-sectional views showing the inner frame of the inspection hatch of the first embodiment from an open state to a closed state relative to the outer frame. [Figure 9A] 3 is a cross-sectional view showing the inspection hatch of the first embodiment in a closed state. FIG. [Figure 9B] The area enclosed by the dashed line in FIG. 9A is shown enlarged. [Figure 10] 1 is a perspective view showing the closed inspection hatch of the first embodiment as seen from inside the room. FIG. [Figure 11] 10 is a perspective view of the appearance of an inspection hatch of a second embodiment as seen from inside the room. [Figure 12] This is an oblique view of the second embodiment of the inspection hatch, with part of the outer frame broken away, taken from the back side of the wall, showing the state before the inner frame is attached to the outer frame. [Figure 13] This is an oblique view showing the inner frame of the inspection hatch of the second embodiment attached to the outer frame, with part of the outer frame broken away as seen from the back side of the wall. [Figure 14] This is an oblique view of a modified inspection hatch of the second embodiment, with part of the outer frame broken away, viewed from the back side of the wall before the inner frame is attached to the outer frame. [Figure 15] This is an oblique view of a modified inspection hatch of the second embodiment, with the inner frame attached to the outer frame, viewed from the back side of the wall, with part of the outer frame broken away. DETAILED DESCRIPTION OF THE INVENTION

[0020] An embodiment of the inspection hatch of the present disclosure will be described with reference to the drawings. Note that the reference numerals commonly used in the drawings indicate the same parts or components even if they are not mentioned in the description of each drawing. Furthermore, the materials of each component mentioned below are examples and are not limited to these.

[0021] (1) First embodiment FIG. 1 is a perspective view showing the exterior of an inspection hatch 10 according to a first embodiment of the present invention. The inspection hatch 10 has an inner frame 30 attached to the inside of an outer frame 20. FIG. 1 shows the outer frame 20 attached to a ceiling, which is an installation surface 90 (not shown), with the inner frame 30 open, as viewed from above the ceiling. In this embodiment, the direction behind the installation surface 90 is referred to as "upward," and the direction toward the front of the installation surface 90 is referred to as "downward."

[0022] The outer frame 20 is made of metal and is formed in a rectangular shape overall, with an outer frame back portion 21 located at the top when attached, and an outer frame front portion 22 located at the bottom, with one side longer than the outer frame back portion 21. A stepped outer frame step portion 23 is formed between the outer frame back portion 21 and the outer frame front portion 22. The upper edge of the outer frame back portion 21 is a wide outer frame back edge 24. One side of this outer frame back edge 24 has notches 21c cut out near both ends.

[0023] The inner frame 30 is also made of metal and is formed in a rectangular shape overall, with an inner frame back portion 31 located at the top when attached, and an inner frame front portion 32 located at the bottom, with one side longer than the inner frame back portion 31. A stepped inner frame step portion 33 is formed between the inner frame back portion 31 and the inner frame front portion 32. A lock 36 is provided in the center of one side of the rotating end of the inner frame 30. The inner frame 30 is attached to the outer frame 20 via a pair of hinge members 50 that engage with the cutouts 21c.

[0024] 2 shows the open state of inspection hatch 10 of this embodiment in a perspective view with a portion of outer frame 20 cut away. Metal hinge member 50 connects outer frame back portion 21 of outer frame 20 to inner frame front portion 32 of inner frame 30.

[0025] The hinge member 50 is composed of a plate-shaped mounting portion 51, a connecting portion 52 formed by bending the outer edge (left edge in the figure) of the mounting portion 51 inward, a support portion 53 extending downward from the lower end of the connecting portion 52, and a rotation shaft 54 ​​that pivotally fastens the inner frame 30 to the support portion 53. In this embodiment, the lower end of the connecting portion 52 forms a crank portion 52a that is bent outward, and the support portion 53 extends from this crank portion 52a. The upper edge of the mounting portion 51 forms a hook portion 51c that is folded back outward, and this portion is hooked to the upper edge of the outer frame 20 via a notch 21c in the outer frame 20. The mounting portion 51 is also fixed to the outer frame back portion 21 of the outer frame 20 with two locking screws 51b. Meanwhile, the inner frame front portion 32 of the inner frame 30 is rotatably attached to the support portion 53 by a hollow rivet that serves as the rotation shaft 54 ​​between the open position and the closed position shown in FIG. 3 .

[0026] Fig. 4 is a plan view from above the ceiling showing the inspection hatch 10 of the first embodiment installed in opening 91 of installation surface 90 (see Fig. 5). Fig. 5 is a partial cross-sectional view showing the inspection hatch of the first embodiment before the inner frame is attached to the outer frame.

[0027] As shown in FIG. 5, a finishing material 93 is attached to the interior side of a base material 92 on the underside of the ceiling on the installation surface 90 where the inspection hatch 10 is provided, and a rectangular opening 91 is provided there. Of the multiple siding members 94 arranged parallel to two parallel sides of the opening 91 (the top and bottom sides in FIG. 4), some of the siding members 94 that abut against two other parallel sides of the opening 91 (the left and right sides in FIG. 4) are discontinued at the opening 91. Furthermore, a siding support 95 arranged perpendicular to the siding members 94 is placed above the siding members 94 and supported from above by hangers 96 with hanging bolts 99. The outer frame 20 is attached to the inner periphery of the opening 91 via a channel catch 98, which is arranged perpendicular to the siding support 95. That is, as shown in FIG. 5, the outer frame back portion 21 is fixed to the channel catch 98 with a frame set screw 21b.

[0028] The lid material 40 attached to the inside of the inner frame 30 is composed of a base material 41 on the ceiling side and a finishing material 42 on the indoor side (see Figure 9A). The base material 41 is fixed to the inner frame 30 with screws via finishing material holders 34 (see Figure 9A). The space between one of the two opposing sets of finishing material holders 34 is reinforced with a reinforcing material 35 that is delivered. The inner frame 30 is attached to the outer frame 20 via hinge members 50. A lock 36 is attached to the center of the rotating end of the inner frame 30, which is opposite the hinge members 50.

[0029] 5, two locking holes 21a for fixing the hinge member 50 are provided in the outer frame back portion 21. As described above, the notch 21c is formed near the end of the outer frame back edge 24. Furthermore, the inner surface of the outer frame front portion 22 is formed with an outer frame recess 22a that is recessed outward.

[0030] As shown in Figure 5, the mounting portion 51 of the hinge member 50 has a locking hole 51a that corresponds to the locking hole 21a in the outer frame back portion 21. A hook portion 51c is formed on the upper edge of the mounting portion 51. The lower end of the connecting portion 52 of the hinge member 50 forms a crank portion 52a that is bent outward, and its outer end forms a support portion 53 that is bent downward. The inner frame 30 is connected to the support portion 53 via a rotation shaft 54.

[0031] From the state shown in Fig. 5, by hooking the hooking portion 51c into the notch 21c of the rear edge 24 of the outer frame, the inner frame 30 is temporarily fixed to the outer frame 20 as shown in Fig. 6. At this time, the positions of the locking hole 21a (see Fig. 4) in the rear part 21 of the outer frame and the locking hole 51a in the mounting portion 51 are aligned. By screwing the locking hole 21a into the locking hole 51a with the locking screw 51b as shown in Fig. 7, the inner frame 30 is attached to the outer frame 20.

[0032] As described above, the rotation shaft 54 ​​connecting the support portion 53 and the inner frame 30 is formed of a hollow rivet, and the inner surface of the support portion 53 is in direct contact with the outer surface of the inner frame 30, providing a moderate degree of resistance to rotation of the inner frame 30 relative to the support portion 53. Therefore, even in the temporarily fastened state shown in Figure 6, the inner frame 30 does not swing uncontrollably relative to the outer frame 20, making it possible to perform the screw fastening work without holding the outer frame 20 by hand. This means that the process of attaching the inner frame 30 to the outer frame 20 during installation of the inspection hatch 10 of this embodiment can be safely performed by a single worker.

[0033] When attached to the outer frame 20, the inner frame 30 can rotate between an open state and a closed state via a rotation shaft 54 ​​relative to the support portion 53 of the hinge member 50, as shown in Figure 8. In other words, the inner frame 30 is not directly supported by the outer frame 20. For this reason, as shown in Figure 8, when the inner frame 30 rotates, the end of the inner frame 30 closer to the rotation shaft 54 ​​does not move upward beyond the back edge 24 of the outer frame. This prevents the rotating end of the inner frame 30 from interfering with equipment on the back side of the inspection hatch 10.

[0034] As shown in the cross-sectional view of FIG. 9A and the enlarged view of FIG. 9B, the outer end of the rotating shaft 54 ​​is aligned with the outer frame recess 22a formed on the inner surface of the outer frame front portion 22. In other words, the outer frame recess 22a prevents interference between the outer end of the rotating shaft 54 ​​and the outer frame 20. Furthermore, as shown in FIG. 9B, the inner surface of the inner frame front portion 32 is formed with an inner frame recess 32a recessed outward, into which the inner end of the rotating shaft 54 ​​fits. Therefore, when attaching the finishing material 42 of the lid member 40 to the inner frame 30, it is not necessary to cut the edges of the finishing material 42. Furthermore, because the hinge member 50 is bent at the crank portion 52a, the hinge member 50 fits neatly between the step of the outer frame 20 and the step of the inner frame 30.

[0035] As shown in Figure 10, when the inspection hatch 10 attached to the opening 91 of the installation surface 90 is closed, the outer frame 20 and the inner frame 30 are in close contact with each other, and the closed state is stably maintained by locking them with a lock 36 on one side.

[0036] (2) Second embodiment FIG. 11 is a perspective view showing the exterior of an inspection hatch 10 of the second embodiment of the present application. The inspection hatch 10 has a structure in which an inner frame 30 is attached to an outer frame 20. FIG. 11 shows the outer frame 20 attached to the wall surface, which is the installation surface 90, and the inner frame 30 in the open state, as viewed from inside the room. In this embodiment, the hinge member 50 is attached to the left edge of the outer frame 20. Note that in this embodiment, the front side of the installation surface 90 refers to the finished surface side of the wall, and the back side of the installation surface refers to the back side of the wall.

[0037] The outer frame 20 is made of metal and is formed into a rectangular shape as a whole, as shown in Figure 11. As shown in Figure 12, the outer frame 20 has an outer frame back portion 21 that is located on the back side of the installation surface 90 when attached, and an outer frame front portion 22 that is located on the front side of the installation surface 90 and has a side length longer than that of the outer frame back portion 21. A stepped outer frame step portion 23 is formed between the outer frame back portion 21 and the outer frame front portion 22. Furthermore, the rear edge of the outer frame back portion 21 is formed as a wide outer frame back edge 24. Two locking holes 21a are formed in the outer frame back portion 21 for fixing the hinge member 50.

[0038] The inner frame 30 is also made of metal and is formed into a rectangular shape as a whole, as shown in Figure 11. As shown in Figure 12, the inner frame 30 has an inner frame back portion 31 that is located on the back side of the installation surface 90 when installed, and an inner frame front portion 32 that is located on the front side of the installation surface 90 and has a side length longer than that of the inner frame back portion 31. A stepped inner frame step portion 33 is formed between the inner frame back portion 31 and the inner frame front portion 32. A lock 36 is provided in the center of one side of the rotating end of the inner frame 30 (see Figure 11). The inner frame 30 is attached to the outer frame 20 via a pair of hinge members 50.

[0039] The hinge member 50 is composed of a plate-shaped mounting portion 51, a connecting portion 52 formed by bending the outer edge of the mounting portion 51 inward, a support portion 53 formed by extending the front end portion of the connecting portion 52 forward (toward the front side of the installation surface 90), and a rotation shaft 54 ​​that axially fastens the inner frame 30 to the support portion 53. The mounting portion 51 is provided with two locking holes 51a that correspond to the locking holes 21a in the rear portion 21 of the outer frame.

[0040] 13, when the inner frame 30 is attached to the outer frame 20, the locking holes 21a in the outer frame back portion 21 and the locking holes 51a in the attachment portion 51 are aligned with each other and fastened with two locking screws 51b, thereby fixing the attachment portion 51 to the inner surface of the outer frame back portion 21 of the outer frame 20. Meanwhile, the inner frame front portion 32 of the inner frame 30 is attached to the support portion 53 with a hollow rivet as a rotation axis 54 so as to be rotatable with respect to the outer frame 20 between an open state and a closed state.

[0041] 14, a receiving member 58 for receiving the hinge member 50 may be provided separately and screwed to the inner surface of the outer frame back portion 21. In this modification, the receiving member 58 is formed in a handle shape as a whole, and has a hook piece 58b on the back side. This receiving member 58 has two locking holes 58a for fixing the hinge member 50. Meanwhile, the mounting portion 51 of the hinge member 50 is formed with a locking portion 51c that locks onto the hook piece 58b of the receiving member 58.

[0042] 15, when the inner frame 30 is attached to the outer frame 20, the hooking portion 51c is engaged with the receiving member 58, the locking hole 21a in the outer frame back portion 21 and the locking hole 51a in the attachment portion 51 are aligned with each other, and the attachment portion 51 is fastened with two locking screws 51b, thereby fixing the attachment portion 51 to the outer frame back portion 21 of the outer frame 20. Meanwhile, the inner frame front portion 32 of the inner frame 30 is attached to the support portion 53 with a hollow rivet as a rotation axis 54 so as to be rotatable between an open state and a closed state with respect to the outer frame 20.

[0043] In this embodiment, the hinge member 50 is attached to the left side of the outer frame 20, but the hinge member 50 may be provided on any side other than the left side, such as the right side, top side, or bottom side, depending on the location where the inspection hatch 10 is installed. Also, in this embodiment, a hollow rivet is used as the rotation axis 54, but other rivets such as a blind rivet can also be used.

[0044] The above describes one example of an embodiment of the present invention, but the embodiment of the present invention is not limited to the above, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0045] 10 Inspection hatch 20 Outer frame 21 Back of outer frame 21a Locking hole 21b Frame fixing screw 21c Cutout 22 Front of outer frame 22a Recessed portion of outer frame 23 Stepped portion of outer frame 24 Back edge of outer frame 30 Inner frame 31 Back of inner frame 32 Front of inner frame 32a Recessed portion of inner frame 33 Stepped portion of inner frame 34 Finishing material holder 35 Reinforcement material 36 Lock 40 Lid material 41 Base material 42 Finishing material 50 Hinge member 51 Mounting portion 51a Locking hole 51b Locking screw 51c Hook portion 52 Connecting portion 52a Crank portion 53 Support portion 54 Rotating shaft 57 Hinge recess 58 Receiving member 58a Locking hole 90 Installation surface 91 Opening 92 Base material 93 Finishing material 94 Rough sill 95 Rough sill support 96 Hanger 97 Channel 98 Channel catch 99 Hanging bolt FS Front side BS Back side

Claims

1. a rectangular outer frame fixed to an opening provided on an installation surface; an inner frame installed inside the outer frame; a pair of hinge members that connect the outer frame and the inner frame and pivotally support the inner frame so as to be rotatable; A lid material attached to the inside of the inner frame; An inspection hatch comprising: The pair of hinge members are attached to the outer frame near both ends of one side thereof, and each of the hinge members is an attachment portion fixed to the vicinity of an end portion of one side of the outer frame; a connecting portion in which an outer edge of the mounting portion is bent inward; When the side where the inside is open relative to the installation surface is the front side and the opposite side is the back side, a support portion is provided extending from the front end of the connecting portion toward the front side; a rotation shaft connecting the support portion and the inner frame; An inspection hatch characterized by having:

2. 2. The inspection hatch according to claim 1, wherein the inner surface of the support portion and the outer surface of the inner frame are in direct contact with each other and are fastened to each other by a rivet that serves as the rotation axis.

3. 3. The inspection hatch according to claim 1, wherein a hook portion is provided on the rear edge of the mounting portion, the hook portion being folded outward and being engaged with the outer frame.

4. an inner frame recess that is recessed outward on a part of the inner side of the inner frame; 4. The inspection hatch according to claim 1, wherein an inner end of the rotating shaft is housed in the inner frame recess.

Images