JPS5820037Y2 - Inner frame support device for ceiling inspection opening - Google Patents

Description

[Detailed description of the invention] This invention relates to a ceiling inspection port placed on the ceiling for later inspection and repair of electrical wiring and various piping installed behind the ceiling, and in particular for the outer frame. The present invention relates to an inner frame support device for supporting an inner frame so that it can be opened and closed.

The conventional inner frame support device has a knob for opening and closing the inner frame protruding from the front side of the inner frame so that the inner frame can be opened and closed from the back side of the ceiling.

For this reason, the aesthetic appearance of the ceiling surface is impaired, and it is necessary to provide holes, notches, etc. at accurate positions in the ceiling plate attached to the inner frame, through which knobs and the like pass.

This invention eliminates the drawbacks of conventional inner frame support devices for ceiling inspection, and provides an inner frame support device that has a simple structure, can reliably support the inner frame, and is easy to open and close. The purpose is to provide

Embodiments of this invention will be described below based on the accompanying drawings.

As shown in Fig. 1, the ceiling inspection opening to which the inner frame support device of this invention is attached is made up of an inner frame 2 pivoted to an outer frame 1 formed in a rectangular shape using a shaft pin 12 so as to be openable and closable. , the inner frame support device is installed at one or two locations between the outer frame 1 and the inner frame 2.
It can be installed at any suitable location.

According to the first embodiment shown in FIGS. 2 to 6, the cam body 6 of the inner frame support device is attached to the base plate 13 as shown in FIG.
It is attached to the outer surface of the inner frame 2 via.

As shown in FIG. 3, this cam body 6 is formed into a substantially wedge shape, and has a locking edge 3 cut out in a substantially wedge shape at its lower end.
An upper edge 4 and a lower edge 5 are formed extending from both ends of the locking edge 3 at an angle in the same direction.

As shown in FIGS. 2 and 3, a substantially rectangular rotating piece 7 is directly pivotally mounted on the inner surface of the outer frame 1 facing the cam body 6, and this rotating piece A pressing spring 8 formed of a plate spring is fixed adjacent to 7 via a mounting base 15.

The rotating piece 7 is provided with a protrusion 9 projecting toward the cam body 6 at a position below the pivot point 10, and a flat part of the pressure spring 8 can make surface contact at a position above the pivot point 10. A pressure receiving portion 14 having a flat head is formed.

The protrusion 9 protruding from the rotating piece 7 is such that the pressing spring 8 is connected to the pressure receiving portion 1.
When the cam body 6 and the protrusion 9 are in the dead center position where they are in surface contact with the protrusion 4, the imaginary line 11 connecting the pivot point 10 of the rotating piece 7 and the protrusion 9 are arranged so as to intersect with the upper edge 4 and the lower edge 5 of the cam body 6, so that when the cam body 6 approaches the protrusion 9 from below, the upper edge 4 and the cam body 6 When the projections 9 are approached from above, the lower edges 5 come into contact with the projections 9, respectively.

In the inner frame support device of the first embodiment, as shown in FIG. 3, when the inner frame 2 is closed, the lower end of the rotating piece 7 is shifted to the left in the drawing, and the rotating piece 7 is rotated. The left shoulder of the pressure receiving part 14 of the piece 7 contacts the pressure spring 8 and pushes the pressure spring 8 upward from its dead center position. A force is generated, which forces the projection 9 into the locking edge 3 of the cam body 6.

In this state, the inner frame 2 is supported within the outer frame 1 with the protrusion 9 of the rotating piece 7 engaged with the engagement edge 3 of the cam body 6.

In order to open the inner frame 2 from the closed state shown in FIG. 3, the inner frame 2 must be pushed up a little to disengage the protrusion 9 from the locking edge 3 of the cam body 6, as shown in FIG. Well, this protrusion 9
is moved by the pressing spring 8 to the position of the protrusion 9 when the pressing spring 8 is located at its dead center, and in this state, the inner frame 2
When the lower edge 5 of the cam body 6 is lowered, as shown in FIG.
comes into contact with the protrusion 9, and when the inner frame 2 is further lowered, the lower edge 5 of the cam body 6 descends while pressing the protrusion 9 to the right in the drawing.
The protrusion 9 wraps around the upper end of the cam body 6 and separates from the cam body 6, and the open front end of the inner frame 2 is released from the outer frame 1.

In addition, in order to support the inner frame 2 in the open state again in the closed state shown in FIG. The upper edge 4 of 6 first contacts the protrusion 9 of the rotating piece 7, and further pushes up the inner frame 2, so that the upper edge 4 presses the protrusion 9 to the left in the drawing and rises, and the protrusion 9 moves upward. It passes through the lower end of the edge 4 and is locked to the locking edge 3 by the pressing force of the pressing spring 8, and in this way the inner frame 2 is supported in a closed state relative to the outer frame 1. .

Next, according to the second embodiment shown in FIG. 7, the cam body 6 fixed on the outer surface of the inner frame 2 has a substantially diamond-shaped cross section, and the cam body 6 has a substantially diamond-shaped cross section. A locking edge 3 is formed with a notch shaped like an inverted letter (nearly an O-shaped figure), and a rotating piece 7 attached to the inner surface of the outer frame is formed in a substantially right triangle shape. The protrusion 9 is connected to an imaginary line 11 connecting the pivot point 10 and the protrusion 9 when the pressing spring 8 is at its dead center position.
is provided so that it coincides with a perpendicular line passing through the pivot point 10, and the protrusion 9 is locked in the locking edge 3 of the cam body 6 when the pressing spring 8 is located at its dead center. has been done.

Therefore, according to the inner frame support device of the second embodiment, as in the case of the first embodiment, the rotating piece 7 is attached to the locking edge 3 of the cam body 6 by vertically operating the inner frame 2. The protrusions 9 can be engaged and detached, thereby allowing the inner frame 2 to be opened and closed with respect to the outer frame 1. In addition, the protrusions 9 that are engaged with the locking edges 3 to support the inner frame 2 are It is located on a perpendicular line that passes through the pivot point 10 of the rotating piece 7, and the shaft pin 12 between the outer frame 1 and the inner frame 2 has loosened due to long-term use, or the inner frame 2, the open front end of the inner frame 2 does not hang down from the outer frame 1, and the pressure spring 8 is at its dead center when the inner frame 2 is closed. 8 can also reduce fatigue.

Since the inner frame support device of this invention is constructed as described above, the knobs for opening and closing the inner frame 2 are not exposed on the front side of the ceiling surface, and the aesthetic appearance of the ceiling surface is not spoiled. In addition, there is no need to provide holes, notches, etc. necessary for protruding knobs, etc. on the ceiling plate attached to the inner frame 2.

Furthermore, according to the inner frame support device of this invention, its structure is extremely simple compared to conventional ones, and it is not only easy to install but also inexpensive to manufacture.

Furthermore, when opening and closing the inner frame 2, there is no need to swing the protrusion 9 protruding from the rotating piece 7 back and forth toward the cam body 6, and the protrusion 9 only rotates within the same plane. Therefore, this protrusion 9 moves along the outer peripheral edge of the cam body 6, and when it engages with the locking edge 3, it always engages at the same depth, and the pivot point of the rotating piece 7 No excessive force is applied to the protrusion 9 and the locking edge 3.
A stable locking relationship can be obtained between the inner frame 2 and the outer frame 1, and the inner frame 2 is reliably supported by the outer frame 1.

[Brief explanation of drawings]

Fig. 1 is a plan view of a ceiling inspection opening to which the inner frame support device of this invention is applied, and Fig. 2 is a sectional view taken along line II-■■ in Fig. 1, showing the inner frame support device according to the first embodiment. , FIG. 3 is an explanatory diagram showing the inner frame support device of the first embodiment with a part of the inner frame cut away in a cross section taken along the line III-III in FIG. 1, and FIGS. FIG. 7 is an explanatory diagram showing the opening/closing operation of the inner frame support device of the example. FIG. 7 is an explanatory diagram showing the inner frame support device of the second embodiment. 1...Outer frame, 2...Inner frame, 3...
...Locking edge, 4...Top edge, 5...
Lower edge, 6...cam body, 7...rotating piece, 8...pressing spring, 9...protrusion, 10
... Pivot point, 11 ... Virtual line.

Claims (1)

[Scope of utility model registration request] On the outer surface of the inner frame 2 which is pivotally attached to the outer frame 1 so as to be freely openable and closable, there is a locking edge 3 which is cut out in a substantially inverted shape at the lower end, and both ends of the locking edge 3 are notched. A cam body 6 having an upper edge 4 and a lower edge 5 extending in the same direction is fixed, while a rotating piece 7 is mounted on the inner surface of the outer frame 1 facing the cam body 6. The rotating piece 7 is provided with a protrusion 9 that protrudes toward the cam body 6, and the protrusion 9 engages and disengages from the locking edge 3 of the cam body 6 by vertically operating the inner frame 2. In the inner frame support device, the rotating piece 7 has a flat head pressure receiving part 14 which is in surface contact with the flat part of the pressing spring 8 provided adjacent to the rotating piece 7.
An imaginary line connecting the pivot point 10 of the rotating piece 7 and the protrusion 9 when the cam body 6 and the protrusion 9 are in a position close to each other, and the cam body 6 is located at the dead center where it is in surface contact with the pressure receiving part 14. 11 is formed to intersect with the upper edge 4 and lower edge 5 of the cam body 6. An inner frame support device for a ceiling inspection opening.