JP7511370B2 - Ceiling lid opening and closing structure - Google Patents

Description

This invention relates to a ceiling lid opening and closing structure for opening and closing a ceiling lid installed on a ceiling.

Patent Document 1 discloses an inspection device for inspecting fire detectors in the ceiling of a building, which has an inspection hatch on the ceiling surface directly below the fire detector facing the fire detector, a door that can be opened by pushing up an inspection rod and that can close automatically under its own weight, a tester installation section that houses a heating or smoke tester that can operate the fire detector is provided at the top end of the inspection rod, and a locking device that can hold the door open is provided below the tester installation section.

Japanese Utility Model Publication No. 7-20796

The structure described in Patent Document 1 makes it possible to inspect fire detectors without a stepladder or scaffolding. However, because the structure described in Patent Document 1 involves opening and closing a hinged lid, the inspection rod needs a retaining piece to hold down the lid in order to keep the hinged lid open. Also, if there is furniture or other fixtures below the ceiling opening, the operation must be performed from diagonally below, and it is not easy to open and close the hinged lid with such an oblique operation.

This invention provides a ceiling lid opening and closing structure that does not require any special design for the inspection rod and allows the ceiling lid to be easily opened and closed from diagonally below.

The ceiling lid opening and closing structure of this invention is a ceiling lid opening and closing structure for opening and closing a ceiling lid installed on a ceiling in order to solve the above problems, and is characterized in that it comprises a frame member located on the periphery of the ceiling lid, and a connecting member having one end rotatably connected to the ceiling lid and the other end rotatably connected to the frame member, and when the connecting member rotates around the connecting point on the other end side, the ceiling lid detaches upward from the frame member and moves laterally relative to the frame member.

With the above configuration, the ceiling lid detaches upward from the frame member and moves laterally, so that a worker can open the ceiling lid by using a rod member to push the ceiling lid upward and move it laterally below the ceiling opening. With the ceiling lid open in this way, a normal inspection rod can be used to inspect fire detectors, etc. In other words, inspection work can be performed without using a stepladder or a special inspection rod. Also, as described above, the ceiling lid can be easily opened and closed even from diagonally below the ceiling opening, because it is sufficient to detach the ceiling lid upward from the frame member and move it laterally.

One end of the connecting member may be located at the end of the ceiling lid, and the other end may be located at the center of the frame member. In this way, by pushing up the center of the ceiling lid from below with a push rod, the ceiling lid can be detached upward from the frame member and easily moved laterally relative to the frame member.

The connecting member may have a length that is approximately half the horizontal length of the ceiling lid. This prevents the horizontal movement range of the ceiling lid from being excessively large, and also allows the length of the connecting member to be within an appropriate range, making material costs appropriate.

The connecting member may be provided on each edge of the ceiling lid in a direction perpendicular to the lateral direction. This allows the ceiling lid to be opened and closed more stably than a structure in which one connecting member is provided on one edge. In addition, the cost can be reduced compared to a structure in which two connecting members are provided on each edge.

The ceiling lid may have an engagement portion on the surface facing the room with which the tip of a push rod used to push up the ceiling lid can be engaged. This can eliminate the problem of the push rod slipping on the surface of the ceiling lid when pushing up the ceiling lid from below.

The present invention has the advantage that no special design is required for the inspection rod, and the ceiling cover can be easily opened and closed from diagonally below.

1 is a side view showing an outline of a ceiling lid opening/closing structure according to an embodiment of the present invention; 2 is an enlarged cross-sectional view taken along the line AA in FIG. 1 . 2 is a plan view showing a ceiling lid and a frame member in the ceiling lid opening/closing structure shown in FIG. 1 . 2 is an explanatory diagram showing the opening operation of the ceiling lid in the ceiling lid opening and closing structure shown in FIG. 1 . 2 is a stereoscopic explanatory diagram showing the opening operation of the ceiling lid (with the lid panel omitted) in the ceiling lid opening/closing structure shown in FIG. 1 . FIG. 2 is a stereoscopic explanatory diagram showing the opening operation of the ceiling lid (with the lid panel omitted) in the ceiling lid opening/closing structure shown in FIG. 1 . FIG. 2 is an explanatory diagram showing the operation of opening the ceiling lid by using a push rod in the ceiling lid opening and closing structure shown in FIG. 1, viewed from the inside of the room. 2 is an explanatory diagram showing the operation of opening the ceiling lid by using a push rod in the ceiling lid opening and closing structure shown in FIG. 1, viewed from the inside of the room. 2 is an explanatory diagram showing an engagement portion of a ceiling lid in the ceiling lid opening/closing structure shown in FIG. 1 .

An embodiment of the present invention will now be described with reference to the accompanying drawings. As shown in Figs. 1 and 2, the ceiling lid opening/closing structure 1 of the embodiment opens and closes a ceiling lid 2 provided on a ceiling C. The ceiling lid 2 includes a frame 21 and a lid panel 22 supported by the frame 21. The ceiling lid 2 has a substantially square shape in a plan view, as shown in Fig. 3.

The ceiling lid opening/closing structure 1 also includes a frame member 3 and a connecting member 4. As shown in FIG. 3, the frame member 3 has a generally square shape that is larger than the ceiling lid 2, and accommodates the ceiling lid 2 so that it can move up and down. When the ceiling lid 2 is accommodated in the frame member 3 in this manner, a gap is formed between the inner surface of the frame member 3 and the outer surface of the ceiling lid 2. The lower piece 3a of the frame member 3 receives the frame body 21 of the ceiling lid 2.

One end of the connecting member 4 is rotatably connected to the ceiling lid 2 by a pin portion 41. The pin portion 41 is provided by penetrating horizontally through the vertical plate portion 21a of the frame body 21 of the ceiling lid 2. The other end of the connecting member 4 is rotatably connected to the frame member 3 by a pin portion 42. The pin portion 42 is provided by penetrating horizontally through the vertical plate portion 3b of the frame member 3.

1, the ceiling lid 2 is supported by the connecting member 4 and disengages upward from within the frame member 3. When the connecting member 4 rotates further about the pin portion 42, the ceiling lid 2 can open in the lateral direction, which is the horizontal component of the movement trajectory of the pin portion 41. The closing movement of the ceiling lid 2 is opposite to the opening movement described above.

In addition, when the ceiling lid 2 is housed in the frame member 3, the connecting member 4 is in an oblique position in which one end side (pin portion 41 side) of the connecting member 4 is slightly lower than the other end side (pin portion 42 side) of the connecting member 4. In other words, the above-mentioned range of lateral movement when the ceiling lid 2 is released upward from within the frame member 3 is minimized.

Between the connecting member 4 and the ceiling lid 2, a washer 51 is fitted onto the pin portion 41. In addition, between the connecting member 4 and the frame member 3, a washer 52 is fitted onto the pin portion 42. As shown by the phantom line in FIG. 2, a reinforcing plate can also be provided that is fitted onto the pin portion 42 on the outer surface side of the frame member 3.

One end of the connecting member 4 is located at the end of the ceiling lid 2, and the other end of the connecting member 4 is located at the center of the frame member 3. In this embodiment, the other end is located approximately at the center of the frame member 3, and the connecting member 4 has a length that is approximately half the length of the lateral direction, which is the movement direction of the ceiling lid 2. For example, if the lateral length of the ceiling lid 2 is L, the length L1 of the connecting member 4 is, for example, 0.4L≦L1≦0.6L.

In addition, one connecting member 4 is provided on each edge of the ceiling lid 2 that is located in a direction perpendicular to the lateral direction.

In this ceiling lid opening and closing structure 1, as shown in Figures 4, 5, and 6, the connecting member 4 rotates around the connecting point (the pin portion 42) on the other end side, causing the ceiling lid 2 to detach upward from the frame member 3 and move laterally relative to the frame member 3. As shown in Figures 7 and 8, the ceiling lid 2 is supported by a push rod 6 that pushes up the ceiling lid 2, so that the position of the ceiling lid 2 can be maintained approximately horizontal.

In this way, the ceiling lid 2 is released upward from the frame member 3 and moves laterally, so that the worker can open the ceiling lid 2 by using the push rod 6 to push the ceiling lid 2 and move it laterally below the ceiling opening. With the ceiling lid 2 open in this way, a normal inspection rod can be used to inspect fire detectors, etc. That is, inspection work can be performed without using a stepladder or a special inspection rod. Also, as described above, the ceiling lid 2 can be easily opened and closed even from diagonally below the ceiling opening, because it is sufficient to release the ceiling lid 2 upward from the frame member 3 and move it laterally. Note that in a structure in which the lid is opened and closed by a hinge, the lid cannot be opened and closed by such a lateral operation.

When one end of the connecting member 4 is located at the end of the ceiling lid 2 and the other end is located at the center of the frame member 3, the ceiling lid 2 can be easily detached upward from the frame member 3 and moved laterally relative to the frame member 3 by pushing up the center of the ceiling lid 2 from below with the push rod 6.

When the connecting member 4 has a length that is approximately half the horizontal length of the ceiling lid 2, when the connecting member 4 is at its most rotated position, the ceiling lid 2 can move horizontally to approximately the end position of the frame member 3, and the ceiling opening can be opened almost completely. In other words, with this configuration, the horizontal movement range of the ceiling lid 2 is not increased more than necessary, and the length of the connecting member 4 can be set to an appropriate range, making the material cost appropriate. Note that if the horizontal movement range of the ceiling lid 2 is increased more than necessary, it becomes difficult to operate the ceiling lid 2 to close it.

When one connecting member 4 is provided on each edge of the ceiling lid 2 that is positioned in a direction perpendicular to the lateral direction, the ceiling lid 2 can be opened and closed more stably than in a structure in which one connecting member 4 is provided on only one edge. In addition, costs can be reduced compared to a structure in which two connecting members 4 are provided on each edge.

As shown in FIG. 9, an engagement portion 22a may be provided on the interior side of the cover panel 22 of the ceiling cover 2, with which the tip of the push rod 6A that pushes up the ceiling cover 2 engages. This can eliminate the problem of the push rod 6A slipping on the surface of the cover panel 22 when pushing up the ceiling cover 2 from below. In this example, the engagement portion 22a is concave so that the tip of the push rod 6A can fit in, but the engagement portion 22a does not have to be concave and may be made of a material that is prone to friction, such as a rubber plate. The engagement portion 22a is not limited to one location, and may also be provided in a desired position for closing the ceiling cover 2, such as the edge of the ceiling cover 2 on the side closer to the ceiling opening.

2, for example, a coil spring may be disposed between the one end of the connecting member 4 and the lower piece 3a of the frame member 3, and the coil spring may apply an upward biasing force to the one end of the connecting member 4 when closed. This makes it easier to push up the ceiling lid 2 with the biasing force. Also, in the position of the washer 52 shown in FIG. 2, a torsion spring (not shown) may be fitted onto the pin portion 41, one end of the torsion spring may be engaged with the one end of the connecting member 4, and the other end of the torsion spring may be abutted against the lower piece 3a of the frame member 3, so that the torsion spring may apply an upward biasing force to the one end of the connecting member 4 when the ceiling lid 2 is closed.

Although an embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope.

1: Ceiling lid opening and closing structure 2: Ceiling lid 3: Frame member 3a: Lower piece portion 3b: Standing plate portion 4: Connecting member 6: Push rod 6A: Push rod 21: Frame body 21a: Standing plate portion 22: Lid surface plate 22a: Engagement portion 41: Pin portion 42: Pin portion 51: Washer 52: Washer C: Ceiling

Claims (5)

A ceiling lid opening/closing structure for opening and closing a ceiling lid provided on a ceiling,
A frame member located on the periphery of the ceiling cover;
a connecting member having one end rotatably connected to the ceiling lid and the other end rotatably connected to the frame member,
A ceiling lid opening and closing structure characterized in that the connecting member rotates around the connection point on the other end side, thereby allowing the ceiling lid to detach upward from the frame member and move laterally relative to the frame member, and the ceiling lid is moved laterally in an approximately horizontal position by pushing up and moving the ceiling lid with a push rod used to push up the ceiling lid . The ceiling lid opening and closing structure according to claim 1, characterized in that one end of the connecting member is located at the end of the ceiling lid, and the other end is located at the center of the frame member. A ceiling lid opening and closing structure according to claim 1 or 2, characterized in that the connecting member has a length that is approximately half the horizontal length of the ceiling lid. A ceiling lid opening and closing structure according to any one of claims 1 to 3, characterized in that the connecting member is provided on each edge of the ceiling lid located in a direction perpendicular to the lateral direction. A ceiling lid opening/closing structure for opening and closing a ceiling lid provided on a ceiling,
A frame member located on the periphery of the ceiling cover;
a connecting member having one end rotatably connected to the ceiling lid and the other end rotatably connected to the frame member,
The connecting member rotates around the connecting point on the other end side, so that the ceiling lid can be released upward from the frame member and can move laterally relative to the frame member,
A ceiling lid opening and closing structure characterized in that an engagement portion is provided on the indoor side surface of the ceiling lid with which the tip of a push rod used to push up the ceiling lid engages.

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