JPS626065B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for rotating a ceiling inspection port installed in a ceiling for inspecting and repairing various equipment such as wiring, piping, and air ducts provided inside the ceiling.

Conventionally, as a rotating device for a ceiling inspection door cover, a rotating shaft protruding toward the outer frame is provided on the inner frame to which the ceiling plate serving as the opening/closing cover is attached, and this rotating shaft is connected to the frame pieces that make up the outer frame. By fitting into a slot drilled in the ceiling, it rotated around the rotation axis to rotate the ceiling inspection opening cover (publication No. 8912 of 1983).

However, in this method, in order to fit the rotating shaft, it is necessary to cut out a part of the frame piece constituting the outer frame to provide a notched groove, which weakens the strength of the outer frame as a whole and also reduces the bearing part of the rotating shaft. Smooth rotation could not be expected because the thickness of the frame pieces was limited.

In order to eliminate these drawbacks, there was also known a device in which a bearing for receiving a rotating shaft provided in the inner frame was disposed in the outer frame (Japanese Utility Model Publication No. 18595/1983).

However, in these rotating devices, the outer frame and the bearing, which is manufactured separately, are made of a thin piece of metal material, and a part of it is cut out to form a guide groove with an opening, and the bearing is located near the edge of the opening. As a result, there was a risk that the bearing would be deformed when the inner frame was attached/detached or opened/closed.

The present invention has a rotary shaft body provided on the outer surface of frame pieces on two opposing sides of an inner frame, and a guide groove formed of a flat plate-like substrate, one of which is open, and the guide groove is formed in an opening side portion of the guide groove. consists of a bearing connected and stiffened by a reinforcing bridge that protrudes toward the outer frame side, and a reinforcing bridge fitting hole formed in a frame piece of the outer frame opposite to the rotating shaft body, so that the bearing can be removed from the outer frame. This relates to a rotating device for a ceiling inspection opening cover that is fixed to a frame piece of a frame by inserting a reinforcing bridge of the bearing into a reinforcing bridge fitting hole formed in the outer frame, and the bearing is formed separately. This eliminates looseness in the part where the rotating shaft is accommodated, and makes the rotating opening and closing smooth. At the same time, it prevents deformation of the bearing, especially around the opening, and makes it easier to insert and remove the rotating shaft. The present invention is characterized in that the bearing can be moved easily and smoothly, and the bearing can be accurately and easily positioned on the outer frame and fixed at a position corresponding to the rotating shaft.

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an outer frame made of aluminum alloy in a substantially rectangular shape, and has a main edge 2 extending in the direction of the opening in the ceiling. Projecting edges 3 protrude from the upper and lower ends of the portion 2 in the left-right direction, and the four frame pieces are bent vertically downward from the upper end side of the projecting edges 3 to form locking claws 4, each of which has a substantially rectangular shape. A reinforcing bridge fitting hole 5 is formed in the main edge 2 of two opposing frame pieces, and a corner fitting 6 is formed in the corner.
Or it is fixed by welding or other means.

7 is an inner frame that is fitted into the opening of the outer frame 1;
Similarly, it is framed in a substantially rectangular shape using an aluminum alloy, and the main edge 2 of the frame piece of the outer frame 1
It has a main edge 8 of the same length, and a projecting edge 9 projects from the lower end of the main edge 8 in the left-right direction, and a projecting edge 9 projects from the upper end of the main edge 8 toward the outer frame. Four frame pieces with locking claws 10 protruding from the side projecting edges 9, 9 are framed in a substantially rectangular shape, and the corners are fixed by means such as corner fittings 6 or welding. The reinforcing bridge fitting holes 5 are provided on the outer surfaces of two opposing side pieces of the four frame pieces constituting this inner frame.
The rotary shaft body 11 faces the outer frame 1 in which the
is provided.

Reference numeral 12 denotes a bearing, which is made of a substantially flat plate-like substrate, and has a guide groove 13 that is open on one side, and a guide groove 13 that extends from the back side of the substrate toward the outer frame 1 at the opening side of the guide groove 13. The connection is stiffened by a reinforcing bridge 14.

The bearing 12 is formed by injection molding of a synthetic resin such as nylon, or by integrally molding aluminum alloy or the like by a die-casting method.

To attach the bearing 12 to the frame pieces of the outer frame 1, first attach the bearing 12 to the main edges 2 of the frame pieces on two opposite sides of the outer frame 1, where the reinforcing bridge fitting holes 5 are bored.
The reinforcing bridge 14 is inserted into and engaged with the reinforcing bridge fitting hole 5 of the outer frame 1, and at the same time, the bearing 12 is inserted into the shaft cylinder insertion hole 15 formed in the outer frame.
Insert the slotted shaft cylinder 16 integrally formed into the shaft cylinder 16, press fit the pin 17 into the shaft hole of the shaft cylinder 16, and
By expanding outward the bearing 12, the bearing 12 is tightly fixed to the main edge 2 of the outer frame 1.

Various structures for the bearing 12 are conceivable in addition to those described above, but as shown in FIG.
The rotating shaft body 11 is formed into a substantially L-shape facing downward.
As shown in FIG. 6, the guide groove 13 is diagonally downward from the open end 19 by making the upper part of the extreme end where the rotary shaft is pivoted smaller than the shaft diameter L so that the rotating shaft body 11 cannot easily come off. The guide groove 13 is formed substantially horizontally as shown in FIG. The rotating shaft body 11 is made smaller than the shaft diameter to prevent the rotating shaft body 11 from coming off. As shown in FIG. 8, an abutment piece 20 extending upward is formed on one side of the guide groove 13 so that the rotating shaft body can be easily guided into the guide groove 13.
As shown in the figure, a protruding plate 22 forming a slope 21 is provided at the open end of the guide groove 13, and the rotating shaft body 11 placed on the flange 3 of the outer frame is moved in the direction of the bearing 12 along the flange 3. and the slope 21 of the protruding plate 22
There is one in which the rotary shaft body 11 is fitted into the guide groove 13 by sliding the shaft.

With the above configuration, in order to attach the ceiling inspection port to the ceiling, first, as shown in FIG. Pass the two pieces together and fit the outer frame 1 into the opening in the ceiling (in this case, the inner frame 7 is the outer frame 1
hook the locking protrusion 26 of the L-shaped fixing piece 28 of the ceiling inspection opening fixture onto the locking claw 4 provided on the rim 3 of the outer frame 1, and then tighten the tightening bolt 27. This tightening bolt 27 is pressed against the channel material 25.
and the lower end of the outer frame 1 and the outwardly directed protruding edge 3 to fix it to the ceiling. Next, attach the inner frame 7 to the outer frame 1.
As shown in FIG. 4, hold the inner frame 7 perpendicularly to the outer frame 1, position it at the opening of the outer frame 1, move the inner frame 7 in the bearing direction (direction A), and move the rotating shaft 11 to the bearing 12.
It is inserted through the opening of the guide groove 13. Further, the inner frame 7 is moved downward (direction B) and fitted into the extreme end 18 of the guide groove 13, and the inner frame is moved upward (direction C) and locked to close.

As described above, according to the present invention, the bearing is made of a flat plate-shaped substrate separate from the outer frame, eliminates looseness etc. in the part where the rotating shaft body is accommodated, and makes the rotation opening and closing smooth, and at the same time guides the opening of one side of the bearing. The opening side of the groove is connected and stiffened by a reinforcing bridge, which prevents deformation in the vicinity of the opening and allows easy and smooth insertion and removal of the rotating shaft. The reinforcing bridge is formed to protrude toward the outer frame, and is fixed by fitting into the reinforcing bridge fitting hole drilled at a predetermined position in the outer frame, thereby allowing the bearing to be removed from the outside. It can be accurately and easily positioned on the frame and mounted at a position corresponding to the rotating shaft.

[Brief explanation of the drawing]

Fig. 1 is a vertical section of the ceiling inspection port of the present invention, showing the state in which it is installed on the ceiling, Fig. 2 is a sectional view of the shaft and its surroundings, Fig. 3 is an exploded perspective view of the bearing, and Fig. 4 is the inside view. Figures 5 to 9, which are state diagrams showing how the frame is attached to the outer frame, show other embodiments of the bearing. 1...Outer frame, 5...Reinforcement bridge fitting hole, 7...
...Inner frame, 11...Rotating shaft body, 12...Bearing, 13
...Guide groove, 14...Reinforcement bridge.

Claims (1)

[Claims] 1. A rotating shaft body provided on the outer surface of frame pieces on two opposing sides of the inner frame and a flat plate-like substrate form a guide groove with one side open, and the outer frame is formed on the opening side of the guide groove. It consists of a bearing that is connected and stiffened by a reinforcing bridge that protrudes toward the side, and a reinforcing bridge fitting hole that is formed in a frame piece of an outer frame that faces the rotating shaft, and the bearing is connected to the frame of the outer frame. A rotating device for a ceiling inspection opening cover, characterized in that a reinforcing bridge of the bearing is fitted into and fixed to a reinforcing bridge fitting hole formed in the outer frame.