JPH0255584B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bearing structure in a ceiling inspection hole installed in a ceiling for inspecting and repairing various equipment such as wiring, piping, and air ducts installed inside the ceiling, especially when the inner frame is opened. This invention relates to a bearing structure in which the inner frame can be removed from the outer frame only when the inner frame is slightly inclined.

Conventionally, the bearing structure of this type of ceiling inspection port is a U-shaped or groove-shaped bearing with a rotating shaft provided on the inner frame side and an upper opening on the vertical side formed on the outer frame. There was something that was centrally supported.

However, in the above bearing structure, when the inner frame is open, that is, when the inner frame is suspended at an open angle of 90 degrees with respect to the outer frame, the inner frame may be pushed up during inspection. In addition, when the inner frame comes into contact with the inner frame or is suddenly opened, the inner frame lifts up and falls off the outer frame, resulting in an unexpected accident.

In addition, the tongue-shaped protruding outward of the inner frame is engaged with the hill-shaped locking hole formed protruding inward of the outer frame in a rolling and sliding manner, and a part of the locking hole is missing. There is a device that can be attached and detached through an opening path that has been removed, but because the tongue piece is loosely fitted in a part of the locking hole, the inner frame tends to wobble when or during opening. There was no guidance to the open path, and if the open path was made large, there was a risk that the rotating shaft would come off during engagement, and if the open path was small, it would be complicated to attach and remove the inner frame. .

In order to solve the above-mentioned disadvantages, the present invention provides a rotating shaft provided on the outer surface of the lower end side of the frame pieces on two opposite sides of the inner frame, and a frame piece of the outer frame facing the rotating shaft. In the bearing structure of the ceiling inspection port, the bearing groove is formed of a bearing groove that removably supports the rotating shaft, and the bearing groove has an opening end located slightly diagonally above the rotating shaft and is formed in a substantially U-shape. and this bearing groove is arranged on the lower end side of the outer frame, so that when the inner frame is pushed up directly upward when the inner frame is in a substantially vertical open state, the outer frame formed on the lower edge of the inner frame is The facing edge contacts the outer surface of the bearing groove to prevent the rotating shaft from coming off, and the inner frame is tilted in the opening direction of the substantially U-shaped bearing groove so that the inner frame can be attached to and detached from the outer frame. By providing a bearing structure for the ceiling inspection port that is characterized by It is an object of the present invention to provide a bearing structure for a ceiling inspection port that allows the inner frame to be easily attached and detached.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figure 1 is an overall plan view of the ceiling inspection opening. 1 is an outer frame made of aluminum alloy. Four frame pieces are framed in a substantially rectangular shape, and the frame pieces are fitted into the opening in the ceiling and fixed by appropriate fixing means. It is something.

Inner frame 2 rotatably fitted and locked to the outer frame 1
The frame 2 is made of aluminum alloy like the outer frame 1, and has four frame pieces arranged in a substantially rectangular shape, and inside the inner frame 2 is a cover plate 3 made of substantially the same material as the ceiling plate (see Fig. 3). is attached.

As shown in FIGS. 2 and 3, the outer frame 1 and the inner frame 2 have a rotating shaft 7 provided on the outer surface of the lower end side of the frame piece on two opposing sides of the inner frame 2. The outer frame 1 is removably engaged with a bearing groove 5 provided in two side frame pieces of the outer frame 1 facing the outer frame 1 .

Reference numeral 8 denotes a locking device located on the opposite side of the rotating shaft 7 and the bearing groove 5, which engages and disengages the inner frame 2 by moving the lock bar 9 back and forth (see FIG. 1).

Each frame piece constituting the outer frame 1 forms a main edge 1a extending in the opening direction, and the main edge 1a
An upper protruding edge 1b is protruded from the upper end, and an outward protruding edge 1c is protruded from the lower end.

The bearing groove 5 formed in the outer frame 1 has its open end 5
a is located slightly diagonally above the rotating shaft 7 and is formed into a substantially U-shape. It is arranged on the projecting edge 1c side and near the corners of the two frame pieces.

The bearing substrate 4 in which the bearing groove 5 is formed is
It is made by molding a synthetic resin material such as nylon by injection molding or integrally molding aluminum alloy or the like by a die-casting method, and has a substantially flat plate shape, and protrudes from the back side toward the main edge 1a of the outer frame 1. Projection part 4a
is formed, and a slotted shaft cylinder 4b is formed above this protrusion 4a.

This bearing board 4 is fitted into and engaged with a slit 1d formed in the main edge 1a of the outer frame 1 of the protrusion 4a, and at the same time, the shaft 4 is formed in the main edge 1a of the outer frame 1. By inserting the slotted shaft cylinder 4b into the cylinder insertion hole 1e and press-fitting the pin 6 into the shaft hole of the slotted shaft cylinder 4b to expand the slotted shaft cylinder 4b outward, the main edge of the outer frame 1 The bearing board 4 is tightly fixed to the portion 1a.

Each frame piece constituting the inner frame 2 is attached to the main edge 1 of the outer frame 1.
The main edge 1a of the outer frame 1 extends from the upper end of the main edge 2a to the main edge 1a of the outer frame 1.
An upper protruding edge 2b is protruded toward the main edge 2a, and an outward protruding edge 2c extending in the left-right direction is protruded from the lower end of the main edge 2a.

Furthermore, a rotating shaft 7 is provided protruding from two main edges 2a on two opposite sides of the inner frame 2, and this rotating shaft 7
is mounted in the bearing groove 5, and the inner frame 2 is rotatably opened and closed about the rotating shaft 7.

In order to attach the inner frame 2 constructed as described above to the outer frame 1, as shown in FIG.
The rotating shaft 7 is inserted into the bearing groove 5 by tilting it slightly inside the shaft.
After placing it at the opening end 5a of the inner frame 2, it is pushed down and attached to the inner frame 2, and the inner frame 2, which is disposed in a slightly inclined manner, is rotated horizontally to bring it into the closed state (the second
(see figure).

Furthermore, as shown in FIG. 5, when the inner frame 2 is pushed upward in the substantially vertically open state, the outward protrusion formed on the lower edge of the inner frame 2 Since the edge 2c and the outer surface of the bearing groove 5 are in contact with each other to prevent the inner frame 2 from coming off, the hanging inner frame 2 can be slightly lowered as shown in FIG. After the inner frame 2 is rotated until it is positioned in an inclined position, the inner frame 2 is pushed up, the rotating shaft 7 is removed from the bearing groove 5, and the inner frame 2 is removed.

As explained above, according to the present invention, the bearing groove formed in the outer frame is configured in a substantially U-shape with its open end located slightly diagonally above the rotation shaft, and When the inner frame is placed on the lower end side of the outer frame and the inner frame is pushed upward in a substantially vertical open state, the outward protrusion formed on the lower edge of the inner frame and the bearing groove The inner frame can be removed from the outer frame only when the inner frame is tilted slightly, and the inner frame is inadvertently pushed up during opening/closing operations. This prevents the inner frame from falling accidentally, even if the inner frame lifts upwards due to contact with the inner frame during inspection work, or if you release your hand during sudden opening. . Additionally, if it is necessary to remove the inner frame, it can only be done by slightly tilting the inner frame, so it can be easily removed if only someone who is familiar with the installation and removal operations is doing so. , since it cannot be easily removed by ordinary people, it is possible to maintain the safety inside the ceiling.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a ceiling inspection opening using the bearing structure according to the present invention, Fig. 2 is a sectional view taken along the - line in Fig.
The figure is a schematic diagram showing the inner frame in an attached/detached state, and FIG. 5 is a schematic diagram showing the inner frame in an open state. DESCRIPTION OF SYMBOLS 1... Outer frame, 2... Inner frame, 2c... Outward projecting edge of inner frame 2, 5... Bearing groove, 7... Rotating shaft.

Claims (1)

[Claims] 1. The rotating shaft is removably pivoted to a rotating shaft provided on the outer surface of the lower end side of the frame pieces on two opposing sides of the inner frame, and to a frame piece of the outer frame opposite to this rotating shaft. In the bearing structure of the ceiling inspection port consisting of a bearing groove, the bearing groove is configured in a substantially U-shape with its open end located slightly diagonally above the rotation axis,
This bearing groove is arranged on the lower end side of the outer frame,
When the inner frame is pushed upward in an approximately vertical open state, the outward protruding edge formed on the lower edge of the inner frame comes into contact with the outer surface of the bearing groove, preventing the rotation shaft from detaching. A bearing structure for a ceiling inspection port, characterized in that the inner frame is tilted in the opening direction of the substantially U-shaped bearing groove, and the inner frame can be attached to and detached from the outer frame.