JPS6212040Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a locking device for a ceiling inspection door that locks an inner frame to which a lid is attached to an outer frame.

Conventionally, this type of locking device has an operating shaft attached to the inner frame as shown in Figure 1, a latch attached to the upper end of this operating shaft, and the latch can be engaged and detached from the outer frame by rotating the operating shaft. In this case, as a means for holding the operating shaft to the inner frame, a metal stopper was brought into direct contact with the operating shaft and fixed to the inner frame. By the way, with this method, since both the operating shaft and the stopper are in metal-to-metal contact, frictional resistance is large and prevents the operating rod from rotating smoothly, and rust forms between the operating rod and the stopper, eventually making it impossible to rotate. Something happened.

In order to solve the above-mentioned drawbacks, this invention consists of a latch that is hooked to the outer frame to maintain the closed state of the inner frame, an operating rod that rotates the latch to detach it from the outer frame, and this operating rod. By attaching a locking device to the ceiling inspection opening, which consists of a cover with an insertion recess into which the control rod can be inserted, and a synthetic resin casing consisting of a washer that is integrated with the cover, the operating rod can be inserted smoothly. It was made to work.

Below, an embodiment of this invention will be explained based on the drawings. In Fig. 2, 1 is an opening B provided in the ceiling A.
Tightening bolt 2 with a roughly rectangular outer frame that is inserted and fixed into the
is fixed to the ceiling. Reference numeral 3 denotes an inner frame having a substantially rectangular shape, and a rotary shaft 4 which is rotatably attached to a frame piece of the inner frame is rotatably connected to a bearing 5 attached to a frame piece of the outer frame and housed in the outer frame 1. ing. Reference numeral 6 denotes a locking device of this invention, as shown in FIG. The main parts are composed of an operating rod 8 that engages and disengages the latch 7, and a synthetic resin casing 9 that houses this operating rod. To further explain the main part in detail, the latch 7 is a substantially rectangular flat board as shown in FIG. A stopper 7b is suspended downward from one side of the rectangular substrate. 8
is an operating rod for rotating this latch 7, and an insertion portion 8b is provided at the upper end of a metallic cylindrical operating rod main body 8a, and this insertion portion 8b is inserted into the fitting hole 7 of the latch 7.
engage with a. On the other hand, the lower tip of the operating rod main body 8a has a flanged head 8c larger in diameter than the operating rod main body 8a.
is installed. 9 is a synthetic resin casing made by injection molding synthetic resin such as ABS resin, and as shown in Fig. 4, there is a through hole 9a in the center.
A base 9c is formed upwardly from one end of the washer 9b.
A semi-cylindrical cover 9e is provided with an operating rod insertion recess 9d with one side open from the base 9c. The operation rod insertion recess 9d communicates with the through hole 9a, and the operation rod main body 8a is housed in the cover and the brim-shaped head 8c is housed in the through hole 9a. Reference numeral 10 is a metal fastener with a recess 10a formed in the center and both left and right wings 10b.
A stopper hole 10c is drilled in the recess 10 of the stopper.
The cover 9c is fitted onto the inner frame 3, and the insertion hole 3a formed in the frame piece of the inner frame 3 and the stopper hole 10c formed in the wing part 10b are aligned and fixed.

To attach the locking device having the above structure to the inner frame 3, first insert the latch fitting hole 7a into the insertion part 8b of the operating rod, secure it with a nut, etc., and then insert the operating rod into the operating rod insertion recess 9d of the casing. Insert the operating rod into the through hole 9a of the washer 9b, and then insert the flange-shaped head 8c of the operating rod into the through hole 9a of the washer 9b.
The operating rod 8 is housed in the casing 9. Then the latch 7, set as above,
The operating rod 8 and the casing 9 are positioned in the inner frame, and the operating rod 8 is inserted into the notches 3b formed at the top and bottom of the inner frame.
At the same time, the notch 3 formed at the lower end of the inner frame 3 into which the base 9c of the casing fits.
The base 9c of the casing is fitted into the base 9c of the casing so that the upper surface of the washer 9b is located on the lower surface of the flange 3e of the inner frame 3. Finally, the stopper 10 is applied from the outside of the casing and fixed to the inner frame 3, completing the installation of the locking device.

Various types of casings are possible, but as shown in Figures 6 and 7, the casing and the stopper are integrated, and mounting pieces 11 are integrally formed on both sides of the cover, as shown in Figure 8. The latch is latched into slits formed in frame pieces in the inner and outer frames, and the latch is housed within the inner and outer frames.

As explained above, in this invention, the cover and washer are integrally formed, so the installation process is omitted and costs can be reduced.
A recess for inserting the operating rod is formed on the inside of the cover in the length direction of the operating rod to hold the operating rod, so the center of rotation of the operating rod will not be eccentric or wobbling, and it will be securely inserted. The latch can be engaged and disengaged by operating the operating rod. Furthermore, since the casing is molded from synthetic resin, the frictional resistance between the operating rod and the operating rod insertion recess of the cover that comes into contact with the cover is small, and the operating rod can be operated smoothly. There is also the advantage that there is no risk that the operating rod will become unable to rotate due to rust.

[Brief explanation of the drawing]

Figure 1 is a conventional locking device, Figure 2 is a sectional view showing an example of a ceiling inspection opening equipped with a locking device according to the present invention, Figure 3 is an enlarged sectional view showing the main parts of the locking device, and Figure 4 is a casing. , FIG. 5 is an exploded perspective view of the locking device, FIG. 6 is an exploded perspective view of another embodiment of the locking device, FIG. 7 is another embodiment of the casing in the locking device, and FIG. 8 is the locking device. 2 is another embodiment of the device. 1... Outer frame, 3... Inner frame, 7... Latch, 8...
...Operation rod, 9...Casing, 10...Stopping metal fitting.

Claims (1)

[Scope of utility model registration request] A ceiling inspection opening in which a rectangular inner frame is pivotably attached to a rectangular outer frame includes a latch that is latched to the outer frame to maintain the closed state of the inner frame, and a latch that is rotated to maintain the closed state of the inner frame. Ceiling inspection consisting of an operating rod that engages and removes from the outer frame, a cover with an insertion recess that can accommodate the operating rod, and a synthetic resin casing that includes a washer that is integrally connected to the cover. Locking device at the mouth.