JPH11159224A - Inner frame locking device for ceiling inspection opening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner frame locking device for a ceiling inspection opening, low in cost and simple in workability, and allow the locking device to be easily fitted to an inner frame with a single operation. SOLUTION: An inner frame locking device for a ceiling inspection opening comprises a rotating member provided with a plate-like latch 12 at one end of an operating shaft 11 and provided with an operating head part at the other end of the operating shaft 11, and a fixed member of such constitution that a semicylindrical holding cylinder 21 for fitting the operating shaft 11 therein is erected on a base 22 provided with a through hole 22a within a plane so as to fit in the operating head part of the rotating member, that a stopper 24 of protruding plate shape is provided on the upper end opening face side of the holding cylinder 21 and that a springy locking arm 23 projecting outward is provided at the lower part of the holding cylinder 21. An upper face flange 33 of an inner frame 3 is provided with a cutout part for supporting the upper part of the operating shaft 11, and a fit-in groove part 33a for fittingly fixing the stopper 24 of protruding plate shape. A lower flange 32 of the inner frame 3 is provided with an aperture hole through which the springy locking arm 34 passes in a contracted state when the holding cylinder 21 is inserted through.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling inspection port provided for inspecting and repairing facilities such as piping and wiring arranged inside a ceiling of a building. The present invention relates to an inner frame locking device for a ceiling inspection opening for maintaining a closed state of a frame.

[0002]

2. Description of the Related Art FIG. 6 is an exploded perspective view showing a conventional inner frame locking device for a ceiling inspection port. The inner frame locking device of the ceiling inspection port includes a rotating member 1 and a fixing member 2. The rotating member 1 includes an operation shaft 11, a flat latch 12 provided at an upper end of the operation shaft 11, and an operation head 13 provided at a lower end of the operation shaft 11. One end of the flat latch 12 is provided with a stopper 12 a which engages with and disengages from the flange 33 of the inner frame 3.

The fixing member 2 includes a substrate 22 having a through hole 22a into which the operation head 13 is fitted, a semicircular cover 21 for embracing an operation shaft rising from the substrate 22, and left and right continuous from the cover 21. Arm 25 projecting in the direction;
The arm 25 includes a split cylinder 25a protruding in communication with a through hole formed in the plane of each arm 25, and an internal pin 26 fitted into the split cylinder 25a.

Further, the inner frame 3 comprises a vertical plate portion 31, and upper and lower flanges 33 and 32 provided at the upper end of the vertical plate portion 31. A mounting hole 36 into which the split cylinder 25a is fitted is formed in the plane of the vertical plate portion 31, and a notch portion 33 for supporting the upper portion of the operation shaft 11 is formed in the upper surface flange 33.
b, and the substrate 22
Are formed at corresponding positions.

In order to mount the locking device on the inner frame 3, the operating shaft 11 is fitted into the cover 21, the operating head 13 is fitted into the through hole 22a, and the rotating member 1 and the fixed member 2 are integrated. combine. In this state, the upper part of the operation shaft 11 is aligned with the notch 33b, the split cylinder 25a is inserted into the mounting hole 36, and the substrate 22 is connected to the lower surface of the notch 35,
That is, it is brought into contact with the bottom surface of the lower surface flange 32. here,
The internal pin 26 is separated from the through-hole of the arm 25 by the split cylinder 25a.
Type in. As a result, the split cylinder 25a is
To be tightly fixed.

[0006]

In a conventional inner frame locking device for a ceiling inspection opening, a locking device (rotating member 1, fixed member 2) is used.
When attaching to the inner frame, the rotating member 1 and the fixed member 2 are previously integrally connected, and then the operating shaft 11 is
It is necessary to perform the operation of driving the driving pin 26 while maintaining this state after the position is set to the position b and the split cylinder 25a and the mounting hole 36 are aligned and fitted. These alignment work and incorporation work are not troublesome,
There are a number of disadvantages in mounting work, such as the necessity of opening mounting holes and the necessity of separately driving pins.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and to provide a locking device having a ceiling inspection opening with a simple workability in which the locking device can be easily and easily attached to the inner frame by a single operation. Aim.

[0008]

In order to achieve this object, a locking device for a ceiling inspection port according to the present invention has the following configuration. The locking device of the ceiling inspection opening is a locking device of the ceiling inspection opening, in which the inner frame is rotatably provided with respect to the outer frame, and the closed state of the inner frame is maintained by the locking device provided in the inner frame. The inner frame locking device is provided with a plate-shaped latch at one end of an operation shaft, a rotation member having an operation head at the other end, and a through hole in which the operation head of the rotation member is fitted. A semi-cylindrical holding cylinder into which the operation shaft is fitted is erected on the substrate, and a protruding plate-shaped stopper is provided on the upper end opening surface side of the holding cylinder, and protrudes outward from a lower portion of the holding cylinder. A fixing member provided with a resilient locking arm, the upper surface flange of the inner frame is provided with a notch portion for supporting an upper portion of the operation shaft, and a fitting groove portion in which the protruding plate-like stopper is fitted. When the holding cylinder is inserted into the lower flange of the inner frame, the elastic locking arm passes in a reduced state. It is characterized by having a window hole.

In the locking device for the ceiling inspection port having such a configuration, the upper portion of the operation shaft is supported (fitted) into the notch of the upper flange of the inner frame. Then, the holding cylinder is inserted into the window hole from below. At this time, the operation head is made to correspond to the upper opening surface of the holding cylinder. In this state, when the holding cylinder is raised, the elastic locking arm is pressed by the edge of the window hole, and passes through the window hole in a contracted state. Then, when the operation head is fitted into the through hole and the substrate comes into contact with the bottom surface of the lower surface flange, the resilient locking arm that has passed through the window hole escapes from the pressure and protrudes and returns to engage with the lower surface flange surface. At the same time, the protruding plate-like stopper fits into the groove of the upper flange. Accordingly, the locking device is completely fixed to the inner frame by the engagement between the elastic locking arm and the flange surface and the engagement between the stopper and the groove.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a locking device for a ceiling inspection port according to the present invention.

As shown in FIGS. 4 and 5, the ceiling inspection opening comprises an inner frame 3, an outer frame 4, and a cover plate 3a for closing the inside of the inner frame 3. As shown in FIGS. 4 and 5, the inner frame 3 and the outer frame 4 are formed by cutting, for example, a steel material, an aluminum alloy material, or the like into a frame piece having a predetermined length in a rectangular shape, and forming a frame. It is assembled and fixed using A.

As shown in FIG. 5, the inner frame 3 of the ceiling inspection opening
The hinge shaft 39 projecting from the corner fitting A provided in the corner portion is rotatably attached to the frame opening of the outer frame 2 by being supported by the corresponding bearing body 42 of the outer frame 4.

As shown in FIGS. 4 and 5, the locking device according to the present invention is provided in the inner frame 3. The locking device includes a rotating member 1 and a fixing member 2 as shown in FIG. The rotating member 1 includes an operating shaft 11 made of metal and having a round bar shape, and an operating shaft 1.
The operation shaft 11 includes a flat latch 12 fixed to one end (upper end) and an operation head (shaft head) 13 fixed to the other end (lower end) of the operation shaft 11. The latch 12 is provided with a rotation stopper 12a that hangs continuously at one end, and has an inclined surface 12b that is inclined upward at one end in the plane. The inclined surface portion 12b intends to smoothly slide when the latch 12 rotates and moves onto the flange surface of the outer frame 4. The operation head 13 has an operation groove 13 on the bottom surface.
a is recessed.

The fixing member 2 is formed of a synthetic resin material such as ABS. The fixing member 2 includes a rectangular substrate 22 having a through hole 22a into which the operation head 22 is inserted, and a leg frame 22b rising from the substrate 22. A semi-circular holding cylinder 21 for holding the operation shaft erected through the middle, a protruding plate-shaped stopper 24 provided on the opening surface side in the upper part of the holding cylinder 21 in the left-right direction, and continuous with the leg frame portion 22b. And a resilient locking arm 23, 23 provided to hang outward. This elastic locking arm 2
3 is provided with a step-like locking claw 23a at the lower part.

As shown in FIG. 3, the inner frame 3 includes a vertical plate 31 and an upper surface flange 3 provided at an upper end of the vertical plate 31.
3 and a lower flange 32 provided at the lower end.
The upper flange 33 is provided with a notch 33b for supporting the upper part of the operation shaft 11 in a fitting manner and a fitting groove 33a formed between the notch 33b and the vertical plate 31. The protruding plate-shaped stopper 24 is fitted into the groove 33a.

The lower flange 32 has a window hole 34 into which the elastic locking arm 23 is fitted in a reduced state. The window hole 34 is set to have a smaller hole diameter than the rectangular substrate 22. Further, a protruding plate portion 32a protrudes from the lower end of the vertical wall 31 in the window hole 34, and a recessed receiving portion 32b is provided at the front end of the protruding plate portion 32a for fitting and supporting the lower portion of the operation shaft 11. ing.

The locking device having such a configuration is connected to the inner frame 3
When attaching to the inner frame 3, the rotating member 1 and the fixed member 2
It can be easily installed in a single operation by combining with. That is, as shown in FIG. 3, the upper part of the operation shaft 11 is supported (fitted) into the notch 33b of the upper surface flange 33 of the inner frame 3. Next, the holding cylinder 21 is fitted into the window hole 34 from below.

At this time, the operation head 13 is made to correspond to the upper opening surface of the holding cylinder 21. In this state, the holding cylinder 2
When the arm 1 is raised, the elastic locking arm 23 that protrudes outside the fixed leg frame portion 22b is pressed by the edge of the window hole 34, and is contracted, that is, the direction in which the locking arm 23 approaches the leg frame portion 22b. Then, it passes through the window hole 34 in the state moved to.

In this state, the operating shaft 11 is housed in the holding cylinder 21 and the operating head 11 is
2a. Then, the substrate 22 is mounted on the lower surface flange 32.
When it comes into contact with the bottom surface of the arm, the elastic locking arm 23 that has passed through the window hole 34 as shown in FIG. 1 escapes from the pressing force and elastically returns (extends and returns). The stopper 24 is engaged with the groove 33 a of the upper surface flange 33 while being locked on the lower surface flange surface 32.

Thus, the fixing member 2 is inserted into the rotating member 1 located in the notch portion 33b from the window hole 34 side, and the rotating member 1 and the fixing member 2 are simply fitted together. The locking device is completely fixed to the inner frame 3 by the engagement operation between the elastic locking arm 23 and the flange surface 32 and the engagement between the stopper 24 and the fitting groove portion 33a by a single fitting operation.

[0021]

According to the present invention, as described above, the rotating member is positioned in the cutout portion of the upper flange of the inner frame, and the fixed member is inserted through the window hole of the lower flange of the inner frame, thereby turning the rotating member. And the fixing member are integrally fitted with each other, so that at the same time as the operation of connecting the rotating member and the fixing member, the elastic locking arm of the fixing member is locked on the lower surface flange, and the stopper of the fixing member is fixed. Engages with the groove of the upper flange and is completely attached. Therefore, as in the prior art, when attaching the locking device to the inner frame, the work of aligning the mounting hole with the split cylinder and the cumbersome work of driving the pin into the split cylinder are not necessary. There is no need to open a mounting hole or separately prepare a driving pin, so that the present invention has an excellent effect of achieving the object of the invention, such as being able to improve the mounting workability at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a locking device is attached to an inner frame.

FIG. 2 is an exploded perspective view showing the locking device.

FIG. 3 is an explanatory perspective view showing a state in which a rotating member and a fixed member are attached to an inner frame.

FIG. 4 is a perspective view showing a ceiling inspection port provided with the locking device of the present invention.

FIG. 5 is a front view showing a ceiling inspection port provided with the locking device of the present invention.

FIG. 6 is an exploded perspective view showing a conventional locking device for a ceiling inspection port.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rotating member 2 fixing member 3 inner frame 4 outer frame 11 operating shaft 12 latch 13 operating head 21 hugging tube 22 substrate 23 resilient locking arm 24 protruding plate-shaped stopper 31 vertical plate 32 lower surface flange 33 upper surface flange 34 window hole 22a Through hole 33a Fitting groove 33b Notch

Claims (1)

[Claims] 1. An inner frame locking device for a ceiling inspection opening, wherein an inner frame is rotatably provided with respect to an outer frame, and a closed state of the inner frame is maintained by a locking device provided in the inner frame. The device is provided on a substrate provided with a plate-shaped latch at one end of an operation shaft, a rotation member having an operation head at the other end, and a through-hole in the plane into which the operation head of the rotation member is fitted. ,
A semi-cylindrical holding cylinder into which the operation shaft is fitted is erected, and a protruding plate-shaped stopper is provided on the upper opening side of the holding cylinder. A fixing member provided with an arm, a notch portion for supporting the upper portion of the operation shaft on the upper surface flange of the inner frame, and a fitting groove portion for fitting the projecting plate-shaped stopper,
An inner frame locking device for a ceiling inspection opening, characterized in that a lower surface flange of the inner frame is provided with a window hole through which a resilient locking arm passes in a reduced state when the holding cylinder is inserted.