JPH0235866Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a locking device for a manhole outer cover.

2. Description of the Related Art Conventionally, some manholes are provided with a locking device on the inner cover in order to prevent illegal third parties from stealing the electric wires inside the manhole or cutting the electric wires.

However, even if a locking device is installed on the inner cover, if the outer cover is inserted into the receiving frame after the purpose of destroying the inner cover and stealing the electric wires inside, no abnormality will be recognized from the outside. This has the disadvantage that it takes time to discover which manhole the intruder came from, making recovery work time-consuming.

This invention aims to provide a locking device for a manhole outer cover that eliminates such drawbacks.

Therefore, in the manhole outer cover locking device of this invention, the outer cover and the inner cover are provided in a receiving frame forming the opening of the manhole so that the outer cover and the inner cover are vertically spaced apart and open upward, respectively, and the upper side of the inner cover is closed. A transverse substantially horizontal horizontal bar is removably locked to the receiving frame at both ends,
In a manhole formed such that the inner cover is fixed by pressing downward through the horizontal bar, a first keyhole is formed in the outer cover at a position above the horizontal bar, and a first keyhole is formed in the outer cover at a position above the horizontal bar. A hook engaging portion is provided on the lower surface of the outer lid at a distance from the lower surface of the outer lid, and a hook engaging portion is provided on the lower surface of the outer lid at a distance from the lower surface thereof, and a hook engaging portion is provided in the hook engaging portion, the center of which is aligned with the first keyhole. 2, and a hook part that is supported by the horizontal bar so as to be swingable at a predetermined position and is bent in the swinging plane of the swinging movement and extends above the hook engaging part in the locked state. The upper end of the hook part has a slope part that slopes downward toward the tip side of the hook part, and the key abutting part is located below and beside the second keyhole, and the lower part engages with the horizontal bar by upward displacement. It is characterized by comprising a swinging lock part having an engaging part and formed so as to hold the hook part in the locked state by its own weight.

In order to unlock the locking device of this manhole outer cover and remove the outer cover, a first keyhole is inserted into the tip of the outer shaft, the inner shaft rotatably supported by the outer shaft, and the outer shaft. A first protrusion protruding perpendicularly to the axial direction, and a first and second keyhole at the tip of the inner shaft, which can pass through the axial direction. The second portion is provided so as to protrude approximately at right angles.
Use a special shaped key consisting of a protrusion.

First, position the first protrusion of the above-mentioned key from the first keyhole to the lower side of the outer cover, and then move the second protrusion to the first position.
from the second keyhole to the lower side of the hook engaging part through the keyhole. When the outer shaft and the inner shaft are rotated at the same time, the second protrusion pushes the abutting part and rotates the swinging lock part in the direction of releasing the lock between the hook part and the hook engaging part, that is, in the unlocking direction. As the first protrusion is moved upward, the first protrusion will not come out upwards, so the outer cover can be removed from the receiving frame by pulling the outer shaft upward.

In addition, when fitting the outer cover into the receiving frame, simply remove the key and insert the outer cover into the receiving frame.The hook engaging part contacts the slope and pushes it away, so the swinging lock part moves in the unlocking direction. After passing through the hook engaging part, it rotates in the opposite direction due to the weight of the engaging part,
The tip of the hook part enters between the hook engaging part and the lower surface of the outer lid, and the lock is automatically established.

In addition, if the outer cover fitted into the receiving frame is forcibly removed, the engaging part of the swing lock part will engage the horizontal bar and will not move upward, so the hook engaging part will bend and close to the center. protrudes downward.

Therefore, if the outer cover is forcibly removed, the protruding part of the hook engaging part will come into contact with the hook part, etc. before it is completely fitted into the receiving frame, and the upper part of the outer cover will protrude from the receiving frame. Therefore, it can be identified at a glance.

As described above, according to this invention, the outer cover cannot be removed without using a special key, and the theft of electric wires inside the manhole and cutting of communication lines are illegal.
In addition, the outer cover that has been removed using a key will automatically become locked simply by fitting it into the holder frame, and the outer cover that has been removed forcibly will be re-attached to the holder frame. It is possible to realize a locking device for the outer lid that can be identified at a glance even if it is fitted into the outer lid.

An embodiment of this invention will be described below with reference to FIGS. 1 to 3.

In FIGS. 1 and 2, 2 is an outer cover of the manhole, 4 is a receiving frame, 6 is a horizontal bar, and 8 is an inner cover.

Both ends of the horizontal bar 6 are engaged with engagement grooves 12 provided in protrusions 10 that protrude from opposing positions on the inner circumferential surface of the receiving frame 4, and a male thread is screwed into the center. (not shown), the inner cover 8 is strongly pressed against the inner cover receiving portion 16 of the receiving frame 4 by sandwiching the gasket 14 to prevent water from entering the manhole.

In addition, near the periphery of the lower surface of the outer lid 2, a pair of L-shaped protrusions 18 are provided at opposing positions to sandwich the protrusion 10 between their tips, so that the outer lid 2 rotates within the receiving frame 4. I try not to let that happen.

Furthermore, a keyhole 20 is provided just above the horizontal bar 6 of the outer cover 2, slightly closer to the center than the peripheral edge of the outer cover 2.

As shown in FIG. 3, this keyhole 20 is made of a rectangle whose long sides are parallel to the radial direction of the outer lid 2, with a circle having a diameter larger than the short sides of the rectangle placed at the center of the rectangle. It has a cross-sectional shape, and the cross-sectional shape becomes slightly larger toward the lower surface of the outer lid 2.

A thick plate-shaped hook engaging portion 22 is provided below the keyhole 20. This hook engaging portion 22
has both ends bent so that the long sides are perpendicular to the radial direction of the outer cover 2 and the center is located parallel to the lower surface 24 of the outer cover 2 by a predetermined distance. Lower surface 24 by bolt 26
It is installed on.

Furthermore, the edge 23 of the hook engaging portion 22 on the peripheral edge side of the outer lid 2 is formed in a cross section like the head of a cannonball.

A keyhole 28 whose central axis coincides with the keyhole 20 is provided in the center of the hook engaging portion 22. It has a similar shape rotated by a degree.

Further, a swinging lock portion 30 is inserted through the horizontal bar 6, and this swinging lock portion 30 includes a support portion 42, a hook portion 44, a slope portion 48, a contact portion 36, and an engaging portion. It consists of 45.

The support portion 42 includes a support rod 38 in the shape of a square column placed on the upper surface of the horizontal rod 6 at right angles to the length direction of the horizontal rod 6.
and rectangular side plates 39 provided on both sides of the support rod 38. In addition, the hook portion 44
is a hook 33 that rises upward from the upper end of the side of each side plate 39 on the receiving frame 4 side, and then is bent and extended at right angles toward the center of the manhole;
3 and a connecting rod 34 that connects the tips of the two.

Further, the slope portion 48 is provided on the upper surface of the tip end of the hook 33 so that the slope slopes downward toward the tip side of the hook 33, and the side plate 39
The upper ends of the sides on the center side of the manhole are connected by an abutment part 36 having a fan-shaped cross section.

Further, the engaging portion 45 includes an arm portion 46 that extends downward from the lower side of each side plate 39 through both outside sides of the horizontal bar 6, and an arm portion 46 that extends downward from the lower side of each side plate 39, and an arm portion 46 that extends downwardly from the lower side of each side plate 39, and an arm portion 46 that extends downward from the lower side of each side plate 39, and a
6 and a weight part 40 which is connected to an arm part 46 in a state of protruding from the lock part 6, and the weight of this weight part 40 causes the swinging lock part 30 to be in an almost upright state, and the tip of the hook 33 is It is located between the hook engaging portion 22 and the bottom surface 24 of the outer lid 2, and is in a locked state.

Further, a semicircular metal fitting 50 that straddles the support rod 38 is fixed to the upper surface of the horizontal rod 6 by a bolt 52, and is regulated to prevent the swing lock portion 30 from moving on the horizontal rod 6. The swing lock part 30 is
The support rod 38 swings in the length direction of the horizontal rod 6 centering on the lower side thereof.

As shown in FIG. 1, in the locking device for the outer lid configured in this way, when the outer lid 2 is fitted into the receiving frame 4, the swinging lock portion 30 is almost locked by the weight of the weight portion 40. It is in an upright state, and in this state, the tip of the hook 33 is located between the hook engaging portion 22 and the lower surface 24 of the outer lid 2. That is,
When the outer cover 2 is fitted into the receiving frame 4, the locking device is in a locked state.

Next, to unlock this locking device, a key 60 such as the one located on the right side of the drawing in FIG. 1 is used.

This key 60 includes an inner shaft 62, an outer shaft 64 that rotatably supports the inner shaft 62, and a thickness and length provided at the tip of the inner shaft 62 that correspond to the rectangular portion of the keyhole 28. a slat 68, a slat 70 provided at the tip of the outer shaft 64 and having a thickness and length corresponding to the rectangular portion of the keyhole 20; is coupled to the blade plate 70 and the center shaft 62, and normally the angle between the blade plate 70 and the blade plate 68 is 90 degrees.
and a handle 7 provided at the upper ends of the inner shaft 62 and outer shaft 64 in parallel with the respective blade plates 68 and 70.
It consists of 4,76.

Now, to unlock this locking device, use the handle 7.
One of the handles 74 or 76 is rotated 90 degrees so that the handles 4 and 76 are parallel. As a result, the blade plate 68 and the blade plate 70 become parallel, so the key 60
is inserted into the keyhole 20 so that only the blade plate 68 protrudes from the keyhole 20. Next, the user removes his hand from the handle 74, returns the angle between the slats 68 and 70 to 90 degrees, inserts the key 60 deeper, inserts the slat 68 into the keyhole 28, and passes it through.

Then, when the entire key 60 is rotated 90 degrees, the end of the blade plate 68 comes into contact with the abutment part 36, and the swing lock part 30 rotates in the direction of the arrow 66, as shown by the imaginary line in FIG. As shown in , the tip of the hook 33 comes out from between the hook engaging portion 22 and the lower surface 24 to be in the unlocked state. At the same time, the blade plate 70 will not come out from the keyhole 20, so by pulling up the key 60, the outer cover 2 can be removed from the receiving frame 4.

Also, when fitting the outer cover 2 into the receiving frame 4, simply remove the key 60 and insert the outer cover 2 into the receiving frame 4, and the edge 23 of the hook engaging portion 22 will come into contact with the slope portion 48. , the swing lock portion 30 rotates in the direction of arrow 66. After the hook engaging portion 22 passes through the slope portion 48, the swinging lock portion 30 returns to an upright state due to the weight of the weight portion 40, and the tip of the hook 33 is brought into contact with the hook engaging portion 22 and the lower surface 24. located between.

Therefore, just by fitting the outer cover 2 into the receiving frame, the locked state is achieved.

In addition, if a strong tensile force is applied to the locked outer cover 2 and the outer cover 2 is forcibly removed, the swinging lock portion 3
Although an upward tensile force is applied to 0, the weight part 40 is hooked on the horizontal bar 6, so the swinging lock part 30 does not come off the horizontal bar 6, and the hook engaging part 22 moves the center part downward. It is bent so that it sticks out.

The outer lid 2 with the hook engaging portion 22 bent is attached to the receiving frame 4.
Even if you try to fit it into the receiving frame 4, the hook engaging part 22 will come into contact with the upper side of the side plate 39 before the outer cover 2 is completely fitted into the receiving frame 4, and the outer cover 2 will lift up from the receiving frame 4. can be identified.

As explained above, in this embodiment, the locking device cannot be unlocked unless a predetermined operation is performed on the specially shaped key 60, so a third party cannot easily enter the manhole. . Also, if you forcibly remove the outer cover 2 and enter, the outer cover 2 will not completely fit into the receiving frame 4 as described above.
It is easy to see which outer cover 2 was removed to infiltrate.
Even if power lines or communication lines inside a manhole are stolen or cut, restoration work can be carried out in a short time.

Furthermore, the outer cover 2 removed using the key 60 is simply inserted into the receiving frame 4 and automatically becomes locked, so there is no need to forget to lock it.

In the above embodiment, since the edge 23 of the hook engaging portion 22 is formed to have a cross-sectional shape similar to the head of a cannonball, the edge 23 can be removed while the outer cover 2 is being removed.
This is to prevent it from getting caught on the hook portion 44.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the main parts of an embodiment based on this invention, Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1, with parts omitted, and Fig. 3 is a plan view of the vicinity of the keyhole 20 of the same embodiment. be. 2...outer lid, 4...receiving frame, 6...horizontal bar, 8...
...Inner lid, 20, 28...Keyhole, 22...Hook engaging part, 30...Swivel lock part, 36...Abutting part, 42
...Supporting portion, 44...Hook portion, 45...Engaging portion, 48...Slope portion.

Claims (1)

[Scope of utility model registration request] An outer cover and an inner cover are installed in a receiving frame that forms the opening of the manhole so as to be vertically spaced apart from each other so as to open upward, and a substantially horizontal horizontal bar that crosses the upper side of the inner cover is attached to and detached from the receiving frame at both ends. In the manhole formed so that the inner cover can be locked and fixed by pressing downward through the horizontal bar, a first keyhole formed in the outer cover at a position above the horizontal bar; , a hook engaging portion provided on the lower surface of the outer lid at a distance from the lower surface of the outer lid, extending below and to the side thereof; and a hook engaging portion whose center is aligned with the first key hole. A second keyhole is provided in a locking state, and a second keyhole is provided on the horizontal bar, which is swingably supported at a predetermined position by the horizontal bar, bent within the swinging plane of the swinging motion, and extending above the hook engaging portion in a locked state. It has a hook part, and has a slope part at the upper end of the hook part that slopes downward toward the tip of the hook part, has a key abutting part on the lower side of the second keyhole, and has a lower part that is connected to the horizontal bar. A locking device for an outer lid, comprising an engaging portion that engages by upward displacement, and a swinging lock portion formed to hold the hook portion in the locked position by its own weight.