JPH0326858Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field of the Invention> This invention relates to a door opening/closing device provided in a ceiling inspection port, and in particular, this invention relates to an improvement of a locking mechanism for locking an opening/closing door.

<Background of the invention> A conventional ceiling inspection port has a frame fitted into a pilot hole of the inspection port provided in the ceiling, and a door with one side pivoted within the frame so as to be openable and closable. A locking mechanism is provided between the frame and the free end of the opening/closing door.

As a locking mechanism of this kind, there is one in which a locking hole is provided on the side of the frame body and a rotating shaft equipped with a hook that engages and disengages from the engaging hole is provided on the opening/closing door side. Locking and unlocking operations are performed by rotating the moving shaft.

However, in the case of this type of lock mechanism, especially when closing the door, it is necessary to support the load of the door with one hand while operating the rotation shaft with a try bar, etc. with the other hand, which makes the work difficult. In addition, the workload was extremely heavy.

Therefore, a method was recently proposed in which the opening/closing door is temporarily locked by pushing it up, and then the locking mechanism is locked by operating the rotating shaft (Jikkosho).
No. 49-25143).

However, this method requires a separate locking mechanism, which complicates the structure and increases costs.Furthermore, the locking operation must be performed after locking, making the operation complicated and making it difficult to forget to lock the lock. There are also problems that arise.

This idea was created by focusing on the above problem, and is a door opening/closing device for ceiling inspection openings that can be locked simply by pushing up the opening/closing door, simplifying the closing operation and preventing forgetting to lock the door. The purpose is to provide.

<Structure and effects of the invention> This invention consists of a frame fitted into the pilot hole of the ceiling inspection opening, an opening/closing door that is pivotably supported on one side within the frame so that it can be opened and closed, and the frame and the opening/closing door. In a door opening/closing device for a ceiling inspection port, the locking mechanism is located at a position opposite to the sliding part of the opening/closing door and the sliding part provided on the inner surface of the frame. and a rotation shaft rotatably supported by.

The slide portion includes a claw plate that is freely slidable in the length direction of the frame, and a guide that is disposed opposite to the tip of the claw plate at an interval that is approximately equal to the shaft diameter of the rotation shaft portion. and a spring that urges the claw plate in the direction of the guide, and a guide surface whose lower side is curved is formed at the tip of the claw plate.

The rotating shaft portion has an operating portion at its lower end, and a hook bent at right angles at its upper end. A spring that biases the parts is connected.

According to the structure of this invention, when the open/close door is pushed up, the rotating shaft portion enters between the claw plate and the guide of the sliding portion and slides the claw plate.
Thereafter, when the hook protrudes onto the claw plate, the claw plate returns due to the spring force, and the hook engages with the claw plate, forming a locked state.

Therefore, when closing the opening/closing door, there is no need to carry out a locking operation while supporting the load of the opening/closing door with one hand, resulting in good workability and reduced work burden. Furthermore, compared to the conventional method in which the door is once locked, the closing and locking operations of the door are simplified, and forgetting to lock the door can also be prevented, which is a significant practical effect.

<Description of Embodiment> FIG. 1 shows the configuration of a ceiling inspection port according to an embodiment of this invention. The ceiling inspection port in the illustrated example is a pilot hole 11 of the inspection port opened in the ceiling panel 1.
A frame body 2 is fitted and fixed to the frame body 2, and an opening/closing door 3 is installed inside this frame body 2.
is pivotably supported on one side so that it can be opened and closed, and a locking mechanism, which is a feature of this invention, is provided between the frame 2 and the free end of the opening/closing door 3.

As shown in FIG.
The rotating shaft portion 5 is rotatably supported at a portion opposite to the sliding portion 6 of the rotating shaft portion 5.

The slide portion 6 faces a claw plate 4 that is freely slidable in the length direction of the frame 2 and is spaced from the tip of the claw plate 4 at an interval that approximately corresponds to the shaft diameter of the rotation shaft portion 5. A guide groove 44 (shown in FIG. 4) is formed between the claw plate 4 and the guide 43, into which the rotating shaft portion 5 is inserted and removed. A circular guide surface 41 whose lower side is curved is formed at the tip of the claw plate 4.
A spring 42 that urges the claw plate 4 toward the guide 43 is connected to the rear end.

The rotating shaft portion 5 has an operating portion 51 consisting of a screwdriver engagement groove at its lower end, and a hook 52 bent at right angles at its upper end. Further, in this rotating shaft portion 5, the hook 52 is pivotably displaced between the direction of the claw plate 4 and the direction perpendicular thereto, and a spring is mounted on the rotating shaft portion 5 as shown in FIG. 53 are connected and arranged to urge the rotating shaft portion 5 so that the hook 52 faces the direction of the claw plate 4.

In the above structure, when the door 3 is in the closed position, the hook 52 of the rotating shaft 5 engages with the tip of the claw plate 4, forming a locked state as shown in FIG.

When inspecting the ceiling, when the rotation shaft 5 is rotated by a set amount, the hook 52 is displaced in the right angle direction and disengaged from the claw plate 4, as shown in FIG. 3, and the door 3 is opened. becomes possible. After the door is opened, the pivot shaft 5 is returned to its original position by the restoring force of the spring 53, as shown in FIG. 4, and the hook 52 is directed toward the claw plate 4.

When closing the opening/closing door 3 after opening, when pushing up the opening/closing door 3 in the open state, the rotation shaft portion 5
The upper surface of the hook 52 presses the circular guide surface 41, causing the claw plate 4 to slide rearward against the spring force. Thereafter, when the hook 52 protrudes onto the claw plate 4, the claw plate 4 returns to its original position due to the spring force of the spring 42, and the hook 52 engages with the claw plate 4, automatically forming a locked state. Become.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of a ceiling inspection port in which this invention was implemented, Fig. 2 is a front view showing the structure of the lock mechanism, Figs. 3 and 4 are front views showing the operation of the lock mechanism, FIG. 5 is a side view showing the rotation shaft. 2...Frame body, 3...Opening/closing door, 4...Claw plate, 41
... Guide surface, 42 ... Spring, 5 ... Rotating shaft part,
52...Hook, 53...Spring, 6...Slide part.

Claims (1)

[Scope of claim for utility model registration] A frame body 2 fitted into a pilot hole of a ceiling inspection opening, an opening/closing door 3 that is pivotably supported on one side within the frame body 2 so as to be openable and closable, and the frame body 2. In a door opening/closing device for a ceiling inspection port comprising a locking mechanism provided between the opening and closing door 3 and a free end thereof, the locking mechanism has a sliding part 6 provided on the inner surface of the frame 2 and a locking mechanism provided between the opening and closing door 3. A rotating shaft part 5 is rotatably supported at a position opposite to a sliding part 6, and the sliding part 6 has a claw plate 4 that is slidably disposed in the length direction of the frame 2. , a guide 43 is disposed facing the tip of the claw plate 4 at an interval substantially equal to the shaft diameter of the rotating shaft portion 5, and a spring 42 biases the claw plate 4 in the direction of the guide 43. In addition, a guide surface 41 having a curved lower side is formed at the tip of the claw plate 4, and the rotating shaft portion 5 has an operating portion 51 at the lower end.
A hook 52 bent in a right angle direction is provided at the upper end, and a spring 53 is connected to the rotation shaft 5 to bias the rotation shaft 5 so that the hook 52 faces the claw plate 4. A door opening/closing device for a ceiling inspection opening.