JPS5914517Y2 - Lid locking device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a locking device that is attached to a lid for closing a vertical hole communicating with a manhole for water supply and sewage and other underground structures.

Many of the covers that block manholes and other vertical holes do not have hooks attached to them, and some of them have locking hooks on the cover, but if only a locking hook is attached, it will prevent the sudden rise in water level that occurs in manholes and vertical holes. As the pressure of the fluid increases, the hook receives water pressure from below and becomes unlocked, and the lid may receive this pressure and move in the unlocking direction.

The present invention solves these problems and provides a lid locking device that can prevent the lid from being blown away due to the locking hook becoming unlocked due to an increase in fluid pressure from inside.

This invention is applied to a type of lid structure that is fitted and supported by a steeply sloped inner circumferential surface of a lid receiving frame.

and a locking hook which is pivotally supported in a suspended state on the periphery of the back surface of the lid and has a bending portion below, and a jaw portion which is protruded from the inner peripheral surface of the lid receiving frame and engages with the bending portion of the locking hook. A locking device for a lid in which a wing is formed on the side surface of a locking hook so that fluid pressure caused by a water flow from below the lid acts on the locking hook in the locking direction.

In order to apply the above-mentioned wing action, the wing may be curved in the form of a plate on the side of the hook, or
As shown in Fig. 9, the side surface of the hook may have a convex bulge to give it its shape.

The upper portion of the wing may have an elevation angle with respect to the center of the back surface of the lid, and the lower portion of the wing may be formed to be inclined in the direction of the bent portion of the locking hook when the locking hook is in the locked state.

In the present invention, the shape of the locking hook for locking the lock in the suspended state includes a Go-shape with a bent part for latching, an L-shape, an inverted T-shape, and the like.

Further, the number of hooks of the present invention attached to the lid may be one or more.

Examples thereof will be described below based on the drawings.

First Embodiment (Refer to Figures 1 to 11) In the embodiment shown in Figures 1 to 11, a U-shaped locking hook is rotatably mounted in the direction of the center of the lid, and the unlocking key of this hook is used as a lever to cover the lid. This is an example where the lock is attached to the tip of an opening/closing crowbar, and the crowbar is used to unlock and open the lid at the same time.

Furthermore, this example has an automatic locking mechanism that automatically locks the locking hook with the receiving frame simply by lowering the lid.

In the figure, 1 is the lid, 2 is the U-shaped locking hook, 3 is the downward bent part that is the tip of the locking hook, 4 is the receiving frame, 5 is the jaw that forms the hook surface, and W is the wing. show.

Further, 6 is an inclined upper surface of the jaw 5, 7 is a crow hole, 8 is a sloped contact surface for lid fitting between the receiving frame 4 and the lid 1, and 9 is in contact with a crow contact surface 12 formed on the upper part of the locking hook 2. Hook pressure surface, 10
is a crowbar, 11 is an L-shaped unlocking key of the crowbar, 12 is a crowbar contacting surface of the crowbar, 13 is a pressing surface that contacts the back surface of the lid 1 of the unlocking key 11, and 14 is a pivot of the locking hook 2 , 15 is a support part of the same axis, 16 is a fitting protrusion at the tip of the hemline slope part of the cover 1 for accurately fitting the cover 1 into the receiving frame 4, and 17 is a jaw part 5 corresponding to the fitting protrusion. The provided recessed portion 18 is a burl receiving surface 1 which gradually becomes thicker and slopes on the back surface of the burl hole 7 of the lid 1.
9 is a hinge, 19' is a detachment prevention pin at the tip of the hinge, 20
is a catch that prevents the hinge from coming off.

In this embodiment, when closing the lid 1, first place the lid 1 into the receiving frame 4.
It is positioned above and slid down along the slope contact surface 8.

In this state, the U-shaped locking hook 2 rotates toward the center of the lid due to its own weight, and the bent portion 3 at the tip of the locking hook 2 is positioned above the jaw 5.

Next, if the lid 1 is gradually lowered, the bottom surface of the bent part 3 of the locking hook 2 will come into contact with the upper sloped part 6 of the jaw part 5, and if the lid 1 is lowered further, the upper sloped part from the jaw part 5 will come into contact with the upper sloped part 6 of the jaw part 5. The locking hook 2 is rotated around the pivot shaft 14 by the reaction force generated by the horizontal component force, and the bent portion 3 at the tip thereof is rotated in a direction retracting toward the center of the lid, and the bottom surface of the bent portion 3 of the locking hook 2 is slid. In the end, it separates from the jaw 5, and if the lid 1 is lowered further, the locking hook 2 will automatically lock and the center of gravity G.
is biased to the right side of the axis, the bent portion 3 of the locking hook 2 is rotated in the direction of the receiving frame 4, and the lower surface of the jaw portion 5 and the bent portion 3 of the U-shaped locking hook 2 are locked. It is something that becomes a state.

Even if the lid 1 is lifted with the hook bent portion 3 and the lower surface of the jaw 5 protruding from the receiving frame 4 engaged, the inner surface of the bent portion 3 of the locking hook 2 will catch on the lower surface of the jaw 5, and the friction or No moment is generated in the locking hook 2 in the unlocking direction due to the reaction force, and the lid 1 does not come off from the receiving frame 4.

To open the lid, use the special crowbar shown in Figs. 7 to 9. With the bent part of the L-shaped unlocking key 11 facing the center of the lid, insert the crowbar 10 into the crow hole 7. 9 of the same crowbar
When rotated 0', the crow contact surface 12 on the lower surface of the bent part of the earth-shaped unlocking key 11 comes into contact with the upper hook pressure surface 9 of the locking hook 2, and then the entire crow 10 is turned outward (toward the receiving frame). If you push the crowbar 10 slightly into the crow hole 7 in this state, the unlocking key 11 will enter between the hook pressure surface 9 of the locking hook 2 and the crowbar receiving surface 18 of the lid 1, and the locking hook will be removed. 2 toward unlocking, the locking between the lower bent portion 3 of the locking hook 2 and the jaw portion 5 is released.

In this state, if the crowbar 10 is further tilted into a horizontal state using the peripheral edge of the receiving frame 4 as a fulcrum, the lid
is lifted up.

Abnormal pressure inside manholes and vertical holes (mainly caused by water pressure that occurs due to a sudden rise in water level).

) occurs, the water flow accompanying the rise in water level hits the blade W, and fluid pressure (horizontal force due to lift force) acts on the blade W, and this force generates a moment in the direction of locking the locking hook 2. Therefore, the locking hook 2 will not become unlocked due to a sudden rise in water level due to approximately normal pressure, and once the water level reaches the manhole cover, the internal pressure will be uniform and the hook will not move.

Therefore, the lid 1 will not be blown off due to these causes.

Note that the lid 1 opposite to the locking hook 2 of this embodiment has No. 10.1.
As shown in Figure 1, attach the hinge 19, insert its tip into the catch seat 20, and prevent it from coming off with the anti-separation pin 19'. 180° reversal is also possible.

Therefore, even if the lid 1 receives water pressure and lifts up a little, causing water to flow out, the lid 1 will not fly up.

Furthermore, even if the lid 1 is lifted from the hinge side, the locking hook 2 of the lid 1 is locked into the jaw 5 of the receiving frame 4, and the locking hook side does not lift up.Moreover, as shown in FIG. Since the mating protrusion 16 is fitted into the recess 17 on the side of the receiving frame 4, it cannot be rotated horizontally, and in the end, the lid 1 does not separate from the receiving frame 4.

Second Embodiment (Refer to Figures 12 to 16) The second embodiment shown in Figures 12 to 16 has the same function and effect as the locking structure of the locking jaw and the structure of the wing attachment (i.e., inside a hole such as a manhole). The water flow will lock the locking hook and prevent it from being released, preventing the lid from being blown off.

), and the only difference is the method of release.

13 to 16 show various examples of unlocking methods.

FIG. 12 shows the structure of the locking hook and jaw, which is almost the same as the locking hook of the first embodiment.

In the locking hook 2 of this embodiment, stopper surfaces 20 and 20' are provided on the locking hook 2 and the lid 1, respectively, so that the locking hook 2 does not rotate excessively due to its own weight.

The purpose of this is to prevent the lid from rotating excessively toward the receiving frame more than necessary and becoming an obstacle when closing the lid.

Further, the locking method is the same as in the first embodiment.

The unlocking method shown in Fig. 13 is to suspend the rotating pillar 21 in the center of the lid
Two holes 22 are bored in the head of the rotating column, and an arm 23 is protruded from the lower part, and the arm 23 is provided with a link 24 that connects the lower part of the locking hook 2.

The lower part of the key stick 25 is divided into two parts so as to fit into the hole 22.

When the lower end of this key rod 25 is inserted into the hole 22 and rotated, the rotating column 21 rotates, and the locking hook 2 is rotated in the direction of detaching from the jaw 5 via the arm 23 and the link 24, thereby unlocking. The lid 1 is opened by lifting it with a crowbar or the like.

In FIG. 14, since the direction of rotation of the locking hook 2 is different by 90 degrees, an L-shaped plate 26 is pivotally mounted in the middle of the link 24, and the arm 23 in FIG. 13 is connected via the same plate. It is linked to.

Figure 15 shows the rack 27 and gear 2 without using the arm 23.
8 is used, and FIG. 16 is an example of another method of unlocking, using a special device 3 with a bent rod 32 attached to the tip.
1 is used, and the special tool is inserted through the cover hole and the tip of the rod 32 is hooked on the locking hook to rotate the locking hook and unlock the lock.

There are various other unlocking methods that rotate the locking hook 2 using a special tool such as a hook rotation pull-up bar with a special shape, and which unlocking method to adopt depends on the purpose and use. It will be done.

As described above, according to the present invention, by providing the locking hook between the lid and the receiving frame, and by forming wings on the locking hook, it is possible to prevent sudden rise in water level due to abnormal pressure generated in manholes and vertical holes. This has the effect of preventing the lid from being blown off due to these causes without being unlocked.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing a manhole cover to which the first embodiment of the lid locking device of the present invention is attached, Fig. 2 is a cross-sectional view showing the main parts of the same embodiment, and Fig. 3 is a view of the lid 1. Bottom view showing the back side,
Fig. 4 is a front view showing the hook of the same embodiment, Fig. 5 is a plan view showing the jaw of the receiving frame, Fig. 6 is a sectional view taken along line I-I in Fig. 5, and Fig. 7 is a plane showing the crowbar. Figure 8 is a front view of the same,
Figure 9 is a side view of the same, Figures 10 and 11 are explanatory diagrams showing the hinge part of the same embodiment, Figure 12 is an explanatory diagram showing the second embodiment, and Figures 13 to 16 are illustrations of various unlocking methods. Explanatory diagram showing an example, 1st
FIG. 7 is a front view showing another example of the locking hook, FIG. 18 is a side view of the same, and FIG. 19 is a longitudinal cross-sectional view at 1 o'clock of FIG. 1; Lid, 2; Locking hook, 3; Lower bending part, 4; Receiving frame, 5;
Jaw, W; wing.

Claims (1)

[Claims for Utility Model Registration] A lock that is pivotally supported in a hanging state on the periphery of the back surface of the lid 1 which is fitted and supported by the steep slope of the inner circumferential surface of the lid holder frame 4, and has a bent portion 3 below. a hook 2; a jaw 5 that protrudes from the inner circumferential surface of the lid holder frame 4 and engages with the bent portion 3 of the locking hook 2;
The locking device is located inward of the lid from the bent portion 3 of the locking hook 2, and when the bent portion 3 and the jaw portion 5 are engaged, the locking hook 2 is located downwardly. A lid locking device characterized in that a wing W is attached to a bending part 3 inclined toward the tip.