Opening prevention device for ceiling inspection hatch and opening prevention method using the same

Abstract

Prevents the ceiling inspection hatch from opening unexpectedly. [Solution] The sliding part 2 is movable outside the inner frame 4 that forms the outer periphery of the inner lid 10, along the extension direction of the inner frame 4. The sliding part 2 is formed in a U-shaped cross section and holds the inner frame 4 inside it. The support part 3 is provided on the sliding part 2 so as to protrude forward in the movement direction of the sliding part 2. The support part 3 is located at the top of the sliding part 2, so that when the sliding part 2 moves forward with the inner lid 10 in the closed state, the support part 3 is located on the upper side of the outer frame 5 or on the back side of the ceiling surface, preventing the inner frame 4 from opening.

Description

[Technical Field]

[0001] The present invention relates to an opening prevention device for a ceiling inspection hatch and an opening prevention method using the same. [Background technology]

[0002] The following Patent Document 1 describes a ceiling inspection hatch in which an opening is formed in a ceiling surface, an outer frame is fitted into this opening, and one end of an inner lid is rotatably attached to this outer frame so that it can be opened and closed. In this technology, a locking part is provided on the other end of the inner lid, and the inner lid is closed by releasably locking the locking part to the outer frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-74181 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a ceiling inspection hatch is installed in a place subject to a lot of vibration, such as inside a train station, the technology of Patent Document 1 has the risk of the locking mechanism being unintentionally released by vibration, causing the inner cover to open. This could result in dust falling from the ceiling or the inner cover falling. Furthermore, there are problems such as the inner cover sagging, damaging the aesthetic appearance of the ceiling surface, and requiring additional work to reseal the ceiling inspection hatch.

[0005] The present invention has been made in view of the above-mentioned circumstances, and a main object of the present invention is to provide a technique that can prevent an inspection hatch in a ceiling from being opened unexpectedly. [Means for solving the problem]

[0006] The present invention can be expressed as the inventions described in the following items.

[0007] (Item 1) An opening prevention device for preventing the opening of an inner lid that blocks a ceiling inspection hatch formed by attaching an outer frame to a ceiling surface, The slide portion and the support portion are provided. The slide portion is movable outside an inner frame that forms an outer periphery of the inner lid along an extension direction of the inner frame, The slide portion has a U-shaped cross section and is configured to hold the inner frame therein. the support portion is provided on the slide portion so as to protrude forward in the movement direction of the slide portion, Furthermore, the support portion is disposed on the upper portion of the slide portion, so that when the slide portion moves forward with the inner lid in the closed state, the support portion is positioned on the upper side of the outer frame or on the rear side of the ceiling surface, preventing the inner frame from opening. Opening prevention device for ceiling inspection hatches.

[0008] (Item 2) A protrusion is provided on the underside of the support portion at a position where the slide portion passes through the upper side of the outer frame when the slide portion is moved forward, thereby providing resistance to the slide portion's movement in the backward direction. An opening prevention device as described in item 1.

[0009] (Item 3) The sliding portion has an operating portion provided at a position exposed on the underside of the inner lid when the sliding portion is attached to the inner frame, and the user can operate this operating portion to move the sliding portion along the extension direction of the inner frame. An opening prevention device according to item 1 or 2.

[0010] (Item 4) The slide portion has a groove that receives the upper end of the inner frame therein, thereby allowing the slide portion to engage with the upper end of the inner frame. An opening prevention device according to item 1 or 2.

[0011] (Item 5) A first tapered surface is formed on the lower surface of the tip side of the support portion to reduce interference between the support portion and the outer frame. An opening prevention device according to item 1 or 2.

[0012] (Item 6) A second tapered surface is formed on the side surface of the support portion facing the outer frame to reduce interference between the support portion and the outer frame. An opening prevention device according to item 1 or 2.

[0013] (Item 7) A method for preventing the inner lid that closes the ceiling inspection hatch from being opened using the opening prevention device according to item 1 or 2, a step of attaching the sliding portion to the outside of the inner frame when the inner lid is in an open state; thereafter, in a closed state of the inner lid, the slide portion is moved forward along the extension direction of the inner frame to position the support portion on the upper side of the outer frame or on the back side of the ceiling surface, thereby preventing the inner frame from opening; A method for preventing a ceiling inspection hatch from opening. [Effects of the Invention]

[0014] According to the technology of the present invention, it is possible to prevent the ceiling inspection hatch from opening unexpectedly. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a front view of an opening prevention device according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a left side view of the opening prevention device of FIG. 1. [Figure 3] FIG. 2 is a plan view of the opening prevention device of FIG. 1. [Figure 4] FIG. 2 is a bottom view of the opening prevention device of FIG. 1. [Figure 5]FIG. 2 is an explanatory diagram of the ceiling inspection hatch of FIG. 1 before the opening prevention device is attached, as seen from the front side (underside of the ceiling). [Figure 6] 6 is an explanatory diagram showing an enlarged view of the main part of the ceiling inspection hatch in Figure 5 with an opening prevention device attached, where Figure (a) shows the position of the opening prevention device in the open state and Figure (b) shows the position of the opening prevention device in the closed state. [Figure 7] 7 is an explanatory diagram showing the ceiling inspection hatch of Figure 6 as seen from the back (the top surface of the ceiling) with the main parts enlarged, and Figure (a) shows the position of the opening prevention device in the open state, and Figure (b) shows the position in the closed state. [Figure 8] 6 is an enlarged cross-sectional view of a main part of the opening prevention device of FIG. 1 attached to the ceiling inspection hatch of FIG. 5. FIG. [Figure 9] 6 is an enlarged longitudinal cross-sectional view of a main part of the opening prevention device of FIG. 1 attached to the ceiling inspection hatch of FIG. 5. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] An opening prevention device according to one embodiment of the present invention will be described below with reference to the accompanying drawings. The opening prevention device 1 (see FIGS. 1 to 4) of this embodiment is intended to prevent the accidental opening of an inner cover 10 that covers a ceiling inspection hatch formed in a ceiling surface (see FIG. 5).

[0017] (Configuration of ceiling inspection hatch) First, the structure of the ceiling inspection hatch to which the opening prevention device of this embodiment is attached will be described with reference to FIGS.

[0018] The ceiling inspection hatch shown in Figure 5 has an outer frame 5 fitted into a square or rectangular opening formed in a ceiling panel 6 (see Figures 8 and 9), with one end (the left end in Figure 5) of an inner frame 4 rotatably attached to the inside of the outer frame 5. The inside of the outer frame 5 forms the ceiling inspection hatch. The underside of the ceiling panel 6 forms the ceiling surface.

[0019] A lid body 9 is attached to the inside of the inner frame 4, and the inner frame 4 and the lid body 9 form an inner lid 10 for closing the ceiling inspection hatch. A locking portion 10a for closing the inner lid 10 is arranged at the other end of the inner lid 10 (the right end in Figure 5).

[0020] As shown in Figures 8 and 9, ceiling panels 6 are fixed to the underside of beam members 8 which are fixed to structural members 7 on the skeleton side. When the ceiling inspection hatch is open, necessary locations on the skeleton side can be viewed through the opening either directly or by equipment.

[0021] The configuration of the ceiling inspection hatch can basically be the same as that of a conventional one, so further detailed explanation will be omitted.

[0022] (Configuration of opening prevention device) The opening prevention device 1 of this embodiment has a sliding part 2 and a supporting part 3 (see FIGS. 1 to 4).

[0023] (Slide part) The sliding part 2 is movable outside one side of the inner frame 4 that forms the outer periphery of the inner lid 10 along the extension direction of the inner frame 4 (see FIGS. 6 and 7). The sliding part 2 is formed in a U-shaped cross section (see FIG. 2) and is configured to hold the inner frame 4 inside. More specifically, the sliding part 2 of this embodiment is composed of a base plate 21, an upper piece 22 that extends in one direction (leftward in FIG. 2) from the upper end of the base plate 21, and a lower piece 23 that extends in one direction (leftward in FIG. 2) from the lower end of the base plate 21, and these pieces form a U-shaped cross section as a whole.

[0024] The sliding part 2 has a wide part 231 at a position exposed on the underside of the inner lid 10 when the sliding part 2 is attached to the inner frame 4 (see FIG. 4). An operating part 232 (see FIGS. 1 and 2) is provided at the tip end of the wide part 231 so as to protrude downward. This operating part 232 can be held by the user with the fingertips, and by operating the operating part 232, the sliding part 2 can be moved along the extension direction of the inner frame 4.

[0025] The sliding part 2 has a groove 221 that accommodates the upper end of the inner frame 4 inside (see Figures 2 and 8), which allows the sliding part 2 to engage with the upper end of the inner frame 4. Note that Figure 8 shows the inner lid 10 in a closed state. Note also that the sliding part 2 in Figure 8 is viewed from the opposite side to that in Figure 2 (i.e., from the back side of Figure 2).

[0026] In this embodiment, the material of the slide portion 2 is stainless steel, but it may be other alloys or resins as long as it has sufficient strength.

[0027] (Support part) The support part 3 is attached to the slide part 2 so as to protrude forward in the movement direction of the slide part 2 (see FIG. 1). In this embodiment, the support part 3 is a separate member from the slide part 2, but the two may also be integrated.

[0028] More specifically, in this embodiment, the support part 3 is positioned on the upper part of the sliding part 2, so that when the sliding part 2 moves forward while the inner lid 10 is in the closed state, the support part 3 is positioned on the upper side of the outer frame 5 or on the back side of the ceiling surface, preventing the inner frame 4 from opening (see Figure 9).

[0029] A protrusion 331 is provided on the underside 33 of the support part 3, which is positioned at a position past the upper side of the outer frame 5 when the slide part 2 moves forward (see Figures 1 and 9), thereby providing resistance to the slide part 2 moving backward.

[0030] A first tapered surface 321 is formed on the lower surface (front surface) 32 on the tip side of the support part 3 to reduce interference between the support part 3 and the outer frame 5 (see FIGS. 1 and 9).

[0031] A second tapered surface 311 is formed on the side surface 31 of the support portion 3 facing the outer frame 5 to reduce interference between the support portion 3 and the outer frame 5 (see FIGS. 2 and 8).

[0032] In this embodiment, the material of the support portion 3 is a hard synthetic resin (for example, PVC), but other resins or alloys may be used as long as they have sufficient strength.

[0033] (How to use the opening prevention device) Next, a method for preventing the opening of the inner lid 10 that closes the ceiling inspection hatch will be described using the opening prevention device 1 of this embodiment. In the initial state, the inner lid 10 is in the closed state, and the opening prevention device 1 is not attached to this inner lid 10 (see FIG. 5).

[0034] In this state, first, the locking portion 10a is operated to open the inner lid 10. Next, with the inner lid 10 in the open state, the sliding portion 2 is attached to the outside of the inner frame 4. Specifically, the sliding portion 2 is attached to one of two sides (i.e., the top and bottom sides in FIG. 5) of the inner frame 4, excluding the side on the base end side (the side rotatably attached to the outer frame 5) and the side on the opening end side (the side locked to the outer frame 5). In this embodiment, the sliding portion 2 is attached to the top side in FIG. 5. Here, since the sliding portion 2 is formed with a U-shaped cross section (see FIG. 2), the inner frame 4 can be held inside the sliding portion 2 (see FIG. 8). Also, the upper end of the inner frame 4 is housed inside the groove 221 of the sliding portion 2 (see FIG. 8). This allows the sliding portion 2 to reliably engage with the upper end of the inner frame 4.

[0035] Next, the inner lid 10 is closed (see Figures 8 and 9). In this state, the locking portion 10a is operated to lock the inner lid 10 to the outer frame 5. In this state, the sliding portion 2 is positioned midway along the edge of the inner frame 4, as shown in Figures 6(a) and 7(a). Next, with the inner lid 10 in the closed state, the sliding portion 2 is moved forward (to the right in Figures 6 and 7) along the extension direction of the inner frame 4. At this time, the protrusion 331 of the support portion 3 moves over the inner frame 4 and outer frame 5 to a position where it reaches the back of the outer frame 5 or the ceiling board 6 outside it. In this state, the sliding portion 2 hits one edge of the inner frame 4 (the edge on the opening end side) and cannot move forward any further.

[0036] In this way, in this embodiment, the support part 3 can be positioned on the upper side of the outer frame 5 or on the back side of the ceiling surface. In this state, even if the locking part 10a is suddenly released due to vibration or the like, the tip of the support part 3 will hit the upper side of the outer frame 5 or the back side of the ceiling surface, preventing the inner cover 10 from falling any further. As a result, this embodiment makes it possible to prevent the ceiling inspection hatch from opening unexpectedly.

[0037] Furthermore, in this embodiment, the ceiling inspection hatch can be reliably and inexpensively prevented from opening unexpectedly by simply installing the opening prevention device 1 on-site without changing the basic structure of the ceiling inspection hatch, which has great practical advantages.

[0038] Furthermore, in this embodiment, the position of the sliding portion 2 can be adjusted by gripping the operating portion 232 provided on the sliding portion 2, which has the advantage of making the operation easy for the worker.

[0039] When opening the ceiling inspection hatch, slide portion 2 is again operated to return opening prevention device 1 to its initial position. Then, locking portion 10a is operated to open the ceiling inspection hatch in the same manner as before.

[0040] In addition, in this embodiment, the protrusion 331 is provided on the lower surface 33 of the support part 3, which can provide resistance to the backward movement of the opening prevention device 1. This can reliably prevent the opening prevention device 1 from moving toward the opening opening when the operating part 232 is not operated.

[0041] Furthermore, in this embodiment, the first tapered surface 321 is formed on the lower surface of the distal end side of the support part 3, which prevents interference between the support part 3 and the outer frame 5. This allows the opening prevention device 1 to move smoothly.

[0042] In addition, in this embodiment, the second tapered surface 311 is formed on the support part 3, which also prevents interference between the support part 3 and the outer frame 5. This allows the opening prevention device 1 to move even more smoothly.

[0043] The above-described embodiment is merely an example and does not represent essential components of the present invention. The configuration of each part is not limited to the above, as long as the gist of the present invention can be achieved. [Explanation of symbols]

[0044] 1 Opening prevention device 2 Slide section 21 PCB 22 Upper piece 221 Groove 23 Lower piece 231 Wide section 232 Operation section 3 Support part 31 Side 311 Second tapered surface 32 Lower surface of tip side (front) 321 First tapered surface 33 Bottom surface 331 Protrusion 4 Inner frame 5 Outer frame 6 Ceiling Panel 7 Structural materials 8 Beam members 9 Lid 10 Inner lid 10a Locking part

Claims

1. An opening prevention device for preventing the opening of an inner lid that blocks a ceiling inspection hatch formed by attaching an outer frame to a ceiling surface, The slide portion and the support portion are provided. The slide portion is movable outside an inner frame that forms an outer periphery of the inner lid along an extension direction of the inner frame, The slide portion has a U-shaped cross section and is configured to hold the inner frame therein. the support portion is provided on the slide portion so as to protrude forward in the movement direction of the slide portion, Furthermore, the support portion is disposed on the upper portion of the slide portion, so that when the slide portion moves forward with the inner lid in the closed state, the support portion is positioned on the upper side of the outer frame or on the rear side of the ceiling surface, preventing the inner frame from opening. Opening prevention device for ceiling inspection hatches.

2. A protrusion is provided on the underside of the support portion at a position where the slide portion passes through the upper side of the outer frame when the slide portion is moved forward, thereby providing resistance to the slide portion's movement in the backward direction. The opening prevention device according to claim 1.

3. The sliding portion has an operating portion provided at a position exposed on the underside of the inner lid when the sliding portion is attached to the inner frame, and the user can operate this operating portion to move the sliding portion along the extension direction of the inner frame. The opening prevention device according to claim 1 or 2.

4. The slide portion has a groove that receives the upper end of the inner frame therein, thereby allowing the slide portion to engage with the upper end of the inner frame. The opening prevention device according to claim 1 or 2.

5. A first tapered surface is formed on the lower surface of the tip side of the support portion to reduce interference between the support portion and the outer frame. The opening prevention device according to claim 1 or 2.

6. A second tapered surface is formed on the side surface of the support portion facing the outer frame to reduce interference between the support portion and the outer frame. The opening prevention device according to claim 1 or 2.

7. A method for preventing the inner lid that closes the ceiling inspection hatch from being opened using the opening prevention device according to claim 1 or 2, a step of attaching the sliding portion to the outside of the inner frame when the inner lid is in an open state; thereafter, in a closed state of the inner lid, the slide portion is moved forward along the extension direction of the inner frame to position the support portion on the upper side of the outer frame or on the back side of the ceiling surface, thereby preventing the inner frame from opening; A method for preventing a ceiling inspection hatch from opening.

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