JP4954532B2 - Ceiling access door - Google Patents

Description

The present invention relates to a ceiling inspection port that is attached to an opening portion opened in a ceiling plate of a structure such as a building or a ship.

In order to maintain and inspect various wiring and piping installed in the back of the ceiling of buildings, ships, underground passages, etc., an opening is formed in the ceiling panel, and a ceiling inspection port is installed in this opening. When necessary, it is often performed to enter the ceiling through the ceiling inspection port and perform inspections and repairs.

Conventionally, a lid with a frame around the plate-like body is simply placed on the ceiling opening, and the lid is lifted and shifted to the side during inspection, and then enters the ceiling and inspects. Although this is generally done, it is not very desirable in terms of the aesthetics of the room.

In view of this, a ceiling inspection port has been proposed that includes an outer frame attached to the opening and an inner frame assembled to the opening of the outer frame by an opening / closing mechanism.
For example, Patent Document 1 discloses that an inner frame can be easily framed by inserting an inner frame corner tool into the fitting groove from the outside of the base wall portion of each of the vertical and horizontal inner frame members. By arranging an opening / closing arm located above the fitting groove of the inner frame corner tool, the outer frame body becomes unnecessarily large or the overhanging edge of the inner frame body overhangs. The ceiling inspection port which can prevent the malfunction which becomes long is disclosed.

JP 2000-64586 A

Since the above-described ceiling inspection port includes an opening / closing arm, when opening / closing, the side opposite to the side where the opening / closing arm of the inner frame is provided is lowered and raised to open / close the inner frame. It is very convenient, but when opening and closing, if the opening and closing is not performed with a part of the inner frame supported, the inner frame suddenly rotates and hangs down, so a load is applied to the rotating shaft. There was a problem that it was easy to break down. In addition, there may be a part of the body or an object immediately below the ceiling inspection port. In this case, it is easy to hit a part of the body, and it is easy to cause inconvenience such as breakage or injury. There was a problem.

The present invention has been made in order to solve the above-described problem, and an outer frame body attached to an opening portion opened in a ceiling plate, and an opening / closing mechanism assembled to the opening portion of the outer frame body so as to be opened and closed. In the ceiling inspection opening equipped with the inner frame body, there is no sudden opening and closing operation when opening and closing the inner frame body, it is safe and the rotating part is not burdened, and failure etc. occur for a long time The purpose is to provide a difficult ceiling inspection port.

That is, the present invention provides the following.
(1) A ceiling inspection port comprising an outer frame body attached to an opening portion opened in a ceiling plate, and an inner frame body assembled to the opening portion of the outer frame body so as to be opened and closed by an opening / closing mechanism, The opening / closing mechanism includes two plate-like opening / closing components A and B pivotally supported on the same vertical surface by a shaft supporting portion at one end of the opening / closing mechanism mounting component fixed to the outer frame, Two plate-like opening / closing components C and D that are pivotally supported at one end on the outer side surfaces near the corners of the inner frame body, and the shaft supporting portion of the opening / closing component A is The opening / closing component B is disposed above the shaft support portion in the vertical direction, and the opening / closing component A and the opening / closing component C are rotatably supported by a shaft support portion α to form a link mechanism. The opening / closing component B and the opening / closing component D are pivotally supported by a pivotal support portion γ. Constitute a link mechanism, the The opening and closing part B and the opening and closing parts C, and is pivotally supported by a shaft journal section β the two link mechanisms are coupled rotatably, said opening and closing part A The distance between the shaft support portion and the shaft support portion α is longer than the distance between the shaft support portion of the opening / closing component A and the shaft support portion of the opening / closing component B, and the opening / closing of the inner frame body Sometimes when a force is applied in the opening and closing direction, the inner frame body is slowly and smoothly opened and closed, and when the inner frame body is opened by the opening and closing mechanism, the shaft support portion α is A ceiling inspection port, wherein the opening operation of the inner frame is stopped by abutting against a halfway side edge of the opening / closing component B other than the pivot support portion pivotally supported by the opening / closing mechanism mounting component.

According to the invention of (1), the opening / closing mechanism that constitutes the ceiling inspection port has a plurality of opening / closing components attached to the outer frame body and the inner frame body and pivotable to each other opening / closing component. When a force is applied in the opening and closing direction when the inner frame body is opened and closed, the inner frame body performs a slow and smooth opening and closing operation. It is possible to provide a ceiling inspection port that is not burdened and is unlikely to cause a failure or the like over a long period of time.

Furthermore, the present invention provides the following.
(2) The ceiling inspection port according to (1) above,
The opening / closing mechanism maintains a vertical relationship between the shaft support portion α and the shaft support portion β during the opening / closing operation of the inner frame body, and the shaft support portion β and the shaft support portion γ are When maintaining a parallel relationship with the bottom of the inner frame body, and when the inner frame body is opened vertically, the shaft support portion α, the shaft support portion β, and the shaft support portion γ are aligned vertically. By being in a state, the side edge on the opening side of the outer frame body in the opening / closing component A, the opening / closing component B, the opening / closing component C, and the opening / closing component D is aligned vertically. Features.

According to the invention of (2), when the inner frame is completely opened and is in a vertical state, the shaft support portions α, β, and γ are in a straight vertical state. That is, in this opening / closing operation, the shaft support portions α, β continue to maintain a vertical relationship, but the shaft support portions β and γ gradually tilt while maintaining a parallel relationship with the bottom of the inner frame, When the shaft support portion β is regarded as a fixed shaft, the shaft support portion γ rotates and finally becomes a vertical state. Therefore, the bottom portion of the inner frame body rotates at the same angle as the shaft support portion β-γ, and the operation of opening the inner frame body is performed. As described above, the shaft support portion β serves as a coupling shaft and a rotation shaft of the two link mechanisms, and the opening / closing operation of the inner frame body is performed while the rotation shaft is moving. Opening and closing operations can be realized.

According to the present invention, when opening and closing the ceiling inspection opening, it is possible to perform a slow and smooth opening and closing operation, so that it is safe and does not burden the rotating part, and there is no trouble over a long period of time. It is possible to provide a ceiling inspection port that is difficult to generate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Of course, the present invention is not limited to the following embodiments, and it is possible to make design changes as appropriate within a range that satisfies the configuration of the present invention.

Fig.1 (a) is a top view which shows typically a part of corner | angular part of the ceiling inspection opening which concerns on this invention, (b) is a longitudinal cross-section of the ceiling inspection opening containing the part shown to (a) FIG. FIG. 2A is a plan view schematically showing the opening / closing component mounting bracket (opening / closing mechanism mounting component), FIG. 2B is a front view of the opening / closing component mounting bracket, and FIG. It is a side view of this opening / closing component mounting bracket. 3A is a plan view showing the opening / closing component A constituting the opening / closing component, FIG. 3B is a plan view showing the opening / closing component B, and FIG. 3C shows the opening / closing component C. It is a top view to show, (d) is a top view which shows the components D for opening and closing.

FIG. 4A is a plan view schematically showing a bracket attached to a corner of the outer frame body, FIG. 4B is a side view of the bracket, and FIG. 4C is a side view of the bracket. It is a front view. FIG. 5 (a) is a plan view schematically showing a bracket attached to a corner of the inner frame body, (b) is a side view of the bracket, and (c) is a side view of the bracket. It is a front view.

In the ceiling inspection port 10 according to the present invention, a rectangular outer frame body 27 having a side wall with a predetermined width in the vertical direction is fixed to the ceiling portion, and has a substantially similar shape provided inside thereof. A small inner frame body 24 is pivotally supported by the outer frame body 27 with one side of the square as an axis (more precisely, a pair of rotation mechanisms as axes), and opens and closes (rotates). The present invention is characterized by this opening / closing mechanism. In addition, a plate-like body is provided in the lower part inside the inner frame body 24 to constitute a bottom portion 240 of the inner frame body 24.

First, the square brackets 25 and 26 shown in FIGS. 4 and 5 will be described. The square brackets 25 and 26 are externally attached to corner portions where the opening and closing mechanisms of the inner frame body 27 and the inner frame body 24 shown in FIG. Reinforcing member for reinforcing mechanical strength of the outer frame body 27 and the inner frame body 24 as well as functions as a member for mounting the switching parts C, D13, 14 and the opening / closing part mounting bracket 16 Also works.

The square bracket 25 for the outer frame shown in FIG. 4 is a plate-like body whose main surface is bent at a right angle, and has two grooved through holes 25a and 25b for screwing bolts on one surface. In addition, three rectangular openings 25c, 25d, and 25e used for fixing to the outer frame body 27 are formed.

The square bracket 26 for the inner frame shown in FIG. 5 is a plate-like body whose main surface is bent at a right angle in the same manner, but the through hole 110a for pivotally supporting the opening / closing component C13 and the opening / closing component D14 on one surface, A horizontally long rectangular plate 110 having 110b is formed by pressing, and in addition, three rectangular openings 26a, 26b, 26c used for fixing to the inner frame 24 are formed.

The opening / closing component mounting bracket 16 shown in FIG. 2 is a member for mounting the opening / closing components A, B12, 15 and includes an outer frame mounting portion 16b bent at a right angle and an opening / closing component mounting portion 16a. It is formed integrally and is attached to a portion near the corner on the inner side of the outer frame body 27 as shown in FIG. As described above, the square bracket 25 is attached to the outside of the corner portion of the outer frame body 27, and the opening / closing component mounting bracket 16 is attached to the square bracket 25 with the outer frame body 27 sandwiched in the middle. Since the corner portion of the frame 27 is firmly reinforced by the square metal fitting 25, even when a load is applied, distortion or the like is hardly generated, and damage or the like does not occur.

FIGS. 3A to 3D show opening / closing components A to D12, 15, 13, and 14 constituting the opening / closing components, and these are all flat plate-like bodies. The opening / closing component A12 is bent in a U-shape, and through holes 12a and 12b for shaft support are formed at both ends. The opening / closing component B15 includes a vertically wide portion and a narrow portion. A shaft support through-hole 15a is formed at the tip of the narrow portion, and two shaft support through-holes are formed in the wide portion. 15b and 15c are formed at predetermined intervals.

The opening / closing component C13 is zigzag bent three times, and through-holes 13a and 13b for shaft support are formed at both ends, and another through-hole 13c for shaft support is formed at a substantially central portion. Is formed. The opening / closing component D14 has a shape bent substantially at a right angle, and through holes 14a and 14b for shaft support are formed at both ends.

These opening / closing components A to D12, 15, 13, and 14 constitute an opening / closing mechanism. At that time, as shown in FIGS. 1 and 6 (a) to (c), the opening / closing component A12 has one end. The through hole 12a is pivotally supported by the through hole 160a of the opening / closing component mounting bracket 16 and is pivotally supported by the opening / closing component C13 (through hole 13b) at the other through hole 12b.
The opening / closing component B15 is pivotally supported by the through hole 160b of the opening / closing component mounting bracket 16 through the through hole 15a at one end, and the opening / closing component C13 (through hole 13c) in the through hole 15b located inside. It is pivotally supported by the opening / closing component D14 (through hole 14b) through the through hole 15c at the other end. Reference numeral 17 indicates a shaft support member used for axial support, and reference numeral 18 indicates a washer interposed between the opening / closing component D14 and the opening / closing component B15. Although not clearly described in other portions, a shaft support member 17 and a washer 18 having the same function are disposed on the shaft support portion of each member.

Further, the opening / closing component C13 is pivotally supported in a through hole 110a (see FIG. 5) of the plate-like body 110 provided in the square metal fitting 26 fixed to the inner frame 24 by the through hole 13a at one end thereof. As described above, the open / close component A12 (through hole 12b) is pivotally supported by the other through hole 13b, and the open / close component B15 (through hole 15b) is pivotally supported by the through hole 13c positioned therein. .

The opening / closing component D14 is pivotally supported by the through-hole 110b of the plate-like body 110 provided in the square metal fitting 26 through the through-hole 14a at one end, and the through-hole 14b at the other end is connected to the opening / closing component C15 (through-hole 15c).

As described above, the opening / closing components A to D12, 15, 13, and 14 are pivotally supported, and thus are linked by four positions of the through holes (shaft support portions) 12a, 12b (13b), 15b (13c), and 15a. The mechanism X is configured, and the link mechanism Y is configured by four positions of the through holes (shaft support portions) 13a, 13c (15b), 15c (14b), and 14a. In accordance with the present invention, the positions of the shaft support portions constituting the link mechanisms X and Y change. In the case of the present invention, the through hole (shaft support portion) 13c (15b) is present in common to both link mechanisms. . That is, the link mechanisms X and Y are coupled with the through hole (shaft support portion) 13c (15b) as a common coupling shaft. Therefore, when an external force is applied to these link mechanisms X and Y, both link mechanisms gradually deform while balancing the force with each other around the through-hole (shaft support portion) 13c (15b). Thus, a slow and smooth opening / closing operation of the inner frame body 24 can be realized.

6 (a) to 6 (c) are longitudinal sectional views showing the operation of the opening / closing mechanism divided into three parts, and four opening / closing components are pivotally supported to each other. The support portions that are not directly supported by the frame body 27 are indicated as α, β, and γ.
As shown to Fig.6 (a), in the state in which the inner frame 24 of the ceiling inspection opening 10 was closed, each part of the components A-D12, 15, 13, and 14 for opening and closing will be in a horizontal state. The pivot portions α, β, and γ whose positions move are at the highest positions.

Next, as shown in (b), when the inner frame 24 opens and one end begins to descend, the two link mechanisms X and Y descend slowly while balancing the force at the β portion that is the coupling axis. I will do it. At this time, α and β maintain a vertical positional relationship with each other, and β and γ descend from the horizontal position as compared with β, but the bottom 240 of the inner frame 24 is Keeping a parallel relationship.

When the inner frame 24 is completely opened and is in a vertical state, α, β, and γ are in a straight vertical state as shown in (c). That is, in this opening / closing operation, α and β continue to maintain a vertical relationship, but β and γ gradually tilt while maintaining a parallel relationship with the bottom of the inner frame body 24, and β is defined as a fixed axis. As seen, γ rotates and finally becomes vertical. Therefore, the bottom portion 240 of the inner frame body 24 rotates at the same angle as β-γ, and the operation of opening the inner frame body 24 is performed. In this way, β serves as a connecting shaft and a rotating shaft of the two link mechanisms, and the opening / closing operation of the inner frame body 24 is performed while the rotating shaft moves, so that the opening / closing operation is performed slowly and smoothly. Can be realized. Of course, since such an opening / closing mechanism is provided at two opposing positions in the vicinity of the corner of the ceiling inspection port 10, the inner frame body 24 performs an opening / closing operation with β existing at two locations as rotation axes. Do it.

In the ceiling inspection port shown in FIG. 1B, the lowering prevention fitting 22 is provided on the outer frame body 27 and the inner frame body 24. When the inner frame body 24 is locked, The frame body 24 can hold the state. Further, as shown on the left side of FIG. 1B, a lock mechanism for locking the inner frame body 24 in a closed state is usually provided in a portion opposite to the portion where the opening / closing mechanism of the inner frame body 24 is provided. Is provided. The fall prevention metal fitting 22 functions as described above in the closed state. However, when the lock is released, the fall prevention metal fitting 22 is separated from the inner frame body 24. That is, when the lock is released, the inner frame body 24 gradually descends due to its own weight.

In addition, a resin cover 23 is provided to improve the appearance of a portion extending outward from the lower portion of the inner frame body 24 to the outer frame body 27 with a predetermined width. It has a structure that fits from below.

Fig.7 (a) is a front view which shows the lock shaft which comprises a locking mechanism, (b) is the top view. FIG. 8A is a plan view showing a lock cam constituting the lock mechanism, and FIG. 8B is a side view.

When the lock shaft 21 is attached, a driver groove 21a for inserting a driver is formed at a lower end portion (left end in FIG. 7), and a fixing bracket 28 is provided at an upper end portion (right end in FIG. 7). A bottomed hole 21b for insertion is formed. As shown in FIG. 8, the lock cam 19 has a substantially square shape, is formed with a through hole 19 a for inserting the fixing bracket 28, and one corner portion is slightly inclined upward. Further, the diagonal portion of the upwardly inclined portion is bent downward and serves as a stopper when rotated.

As shown on the left side of FIG. 1B, the lock shaft 21 is rotatably attached by a lock mounting bracket 20 provided on the outside of the inner frame body 24 so as to surround the lock shaft 21. In addition, at the upper end of the outer frame body 27, the lock cam 19 is disposed at the tip of the lock shaft 21 so that the shape of the through hole 19 a of the lock cam 19 and the convex portion 21 b of the lock shaft 21 are matched, and is fixed by a fixing bracket 28.

After the lock cam 19 is installed in the above-described manner, the inner frame body 24 is locked or unlocked by being rotated. Since the lock cam 19 is inclined at one corner, the lock cam 19 can be smoothly moved onto the upper end of the outer frame body 27 and can be rotated only within a certain range by the stopper. ing.

In the present invention, the inner frame body 24 of the ceiling inspection port 10 is normally closed as shown in FIG. 1B. However, when performing inspection or the like, first, the inner frame body 24 is arranged on the side opposite to the opening / closing mechanism. A driver is inserted into the driver groove 21a of the provided lock shaft 21 and rotated so that the lock is released.

In this way, when the lock is released, due to the weight of the inner frame body 24, the side on which the lock mechanism is formed slowly descends at a predetermined speed even if it is left as it is, and finally, the inner frame body 24 is almost vertical. (See FIG. 6C).

By setting the inner frame body 24 in such a state, it is possible to easily inspect the back of the ceiling, and it is possible to avoid a dangerous state due to the inner frame body 24 being rapidly lowered. In addition, since a smooth opening and closing can be realized, it is possible to provide a ceiling inspection port that does not impose a burden on the rotating portion and is unlikely to cause a failure or the like over a long period of time.

(A) is a top view which shows typically a part of corner | angular part of the ceiling inspection opening which concerns on this invention, (b) is a longitudinal cross-sectional view of the ceiling inspection opening containing the part shown to (a) is there. (A) is a plan view schematically showing the opening / closing mechanism mounting bracket, (b) is a front view of the opening / closing mechanism mounting bracket, and (c) is a side view of the opening / closing mechanism mounting bracket. . (A) is a plan view showing an opening / closing component A constituting the opening / closing component, (b) is a plan view showing an opening / closing component B, and (c) is a plan view showing the opening / closing component C. It is a figure and (d) is a top view which shows the components D for opening / closing. (A) is a top view which shows typically the square metal fitting attached to the corner | angular part of an outer frame, (b) is a side view of this square metal fitting, (c) is a front view of this square metal fitting. It is. (A) is a top view which shows typically the square metal fitting attached to the corner | angular part of an inner frame, (b) is a side view of this square metal fitting, and (c) is a front view of this square metal fitting. It is. It is a side view which shows an example of the metal fitting for fixation, (b) is a side view which shows another metal fitting for square member fixation. (A)-(c) is a longitudinal cross-sectional view which shows operation | movement of this opening-and-closing mechanism divided into 3 times. (A) is a front view which shows the lock shaft which comprises a lock mechanism, (b) is the top view. (A) is a top view which shows the lock cam which comprises a lock mechanism, (b) is a side view.

Explanation of symbols

10 Ceiling inspection opening 12 Opening and closing part A
13 Opening and closing parts C
14 Opening and closing parts D
15 Opening and closing parts B
16 Opening / closing parts mounting bracket 17 Shaft support member 18 Washer 19 Lock cam 20 Lock mounting bracket 21 Lock shaft 22 Lowering prevention bracket 23 Resin cover 24 Inner frame body 25, 26 Square bracket 27 Outer frame body 28 Fixing bracket

Claims (2)

A ceiling inspection port provided with an outer frame body attached to an opening portion opened in the ceiling plate, and an inner frame body assembled to the opening portion of the outer frame body so as to be opened and closed by an opening and closing mechanism,
The opening / closing mechanism includes two plate-like opening / closing components A and B pivotally supported on the same vertical surface by a shaft supporting portion at one end of the opening / closing mechanism mounting component fixed to the outer frame, Two plate-like opening / closing components C and D that are pivotally supported at one end on the outer side surfaces near the corners of the inner frame body, and the shaft supporting portion of the opening / closing component A is Arranged on the upper side in the vertical direction of the shaft support part of the opening and closing part B,
The opening / closing component A and the opening / closing component C are pivotally supported by a pivotal support portion α to form a link mechanism, and the opening / closing component B and the opening / closing component D are rotatable. The opening / closing component B and the opening / closing component C are pivotally supported by the shaft supporting portion β so that the two link mechanisms can be rotated. The distance between the shaft support portion of the opening / closing component A and the shaft support portion α is the distance between the shaft support portion of the opening / closing component A and the shaft support portion of the opening / closing component B. Longer, when a force acts in the opening and closing direction when opening and closing the inner frame body, a slow and smooth opening and closing operation of the inner frame body is performed,
Further, when the inner frame body is opened by the opening / closing mechanism, the shaft support portion α is located on the middle edge of the opening / closing component B other than the shaft support portion supported by the opening / closing mechanism mounting component. A ceiling inspection opening characterized in that the opening operation of the inner frame is stopped by contact. The opening / closing mechanism maintains a vertical relationship between the shaft support portion α and the shaft support portion β during the opening / closing operation of the inner frame body, and the shaft support portion β and the shaft support portion γ are Continue to maintain a parallel relationship with the bottom of the inner frame,
Further, when the inner frame body is opened vertically, the shaft support part α, the shaft support part β, and the shaft support part γ are in a straight vertical state, so that the opening / closing component A, 2. The ceiling inspection port according to claim 1, wherein side edges on the opening side of the outer frame body in the opening / closing component B, the opening / closing component C, and the opening / closing component D are aligned vertically.

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