JPH0533569Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a hinge device for preventing manhole covers from floating, and is intended to prevent manhole covers from floating even if the water pressure (internal pressure) of the pipe increases. be.

BACKGROUND ART Conventional devices of this type still require improvement.

Problems to be Solved by the Invention The problem with this invention is that it is intended to simplify the structure of the floating prevention hinge device and to ensure its operation.

Means for Solving the Problems The technical means to be solved by the present invention has the gist of the configuration described in the claims for utility model registration, and is a hinge for opening and closing a manhole cover that has a ball head as its main body. In the device, a locking piece into which the supporting leg piece of the spherical head is inserted projects horizontally from the inner peripheral surface of the manhole outer frame, and a locking piece is provided in the locking hole of the locking piece on both sides of the supporting leg piece. The left and right diagonal grooves are recessed to pass through the left and right protrusions that are slightly protruded.

Function To explain the closed state of the manhole cover with reference to Fig. 1, the open side (left side in the figure) is locked by a locking device, the hinge side (right side in the figure) is locked by a floating prevention hinge device, and this hinge As shown in FIG. 2, the state of the device is such that the protrusions protruding from both sides of the support leg piece approximately in the middle are located below the locking piece after passing through the diagonal groove of the locking piece; This is the operating state that prevents the lid from floating (directly above).

Next, the case of opening the cover body of the manhole cover will be explained with reference to FIG. That is, in this case, after opening the locking device in advance, if you use an opening/closing tool (not shown) on the left side of the lid as shown in the figure to raise it as shown by arrow a in the figure and pull it to the left in the figure, the hinge on the right side in the figure will open. In the device, the protrusion moves leftward along the lower surface of the horizontal locking piece, is introduced into a diagonal groove recessed in the locking hole of the locking piece, and rises together with the supporting leg piece. Because it comes out on the top surface of the locking piece,
It becomes possible to open and close the hinge device mainly composed of the ball head, and the lid can be fully opened.

Note that when closing this lid, the above-described operations can be performed in the reverse order.

Furthermore, with reference to FIG. 4, a state in which floating of the lid is prevented will be explained.

In other words, when the manhole cover is closed as shown in Figure 1, when water pressure increases in the pipe, this water pressure is applied perpendicularly to the bottom surface of the cover, causing the protrusion of the support leg to The lid body is locked by the lower surface of the locking piece, and as shown in FIG. 4, the lid body floats only slightly, but is prevented from floating completely.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.The main parts of this embodiment are as follows. That is,
In the hinge device C for opening and closing a manhole cover, which is mainly composed of a ball head 2, the supporting leg piece 3 of the ball head 2 is inserted into the other side of the lower surface of the lid body 1, which is equipped with a locking device R on one side. The locking piece 4 projects horizontally from the inner peripheral surface of the manhole outer frame W, and the locking hole 5 of the locking piece 4 has left and right protrusions slightly projecting on both sides approximately in the middle of the support leg piece 3. The left and right diagonal grooves 7, 7 for passing through the sections 6, 6 are recessed.

Next, each member of the present example described above will be explained. As shown in FIG. Since the neck portion 10 of the supporting leg piece 3 is movable along the guide groove 9 below the portion 8, the lid body 1 can be rotated to the right in the drawing.

In addition, in the figure, 11 is a retaining pin for the ball head 2;
Reference numeral 12 denotes a stopper provided at the lower end of the supporting leg piece 3, which prevents the supporting leg piece 3 from slipping out of the locking hole 5 of the locking piece 4.

Next, the operation of this embodiment will be explained. First, the first
To explain the closed state of the manhole cover M with reference to the figure, the open side (left side in the figure) is locked by a locking device R, and the hinge side (right side in the figure) is locked by a floating prevention hinge device C. In state C, as shown in FIG.
After passing through, the lid body 1 can be prevented from floating (directly above) at a position below the locking piece 4.

Next, the case of opening the cover body 1 of the manhole cover M will be explained with reference to FIG. That is, in this case, after opening the lock device R in advance,
When the left side of the lid 1 in the figure is lifted and pulled to the left in the figure as shown by the arrow a with an opening/closing tool (not shown), the projection 6 on the right hinge device C in the figure is attached to the lower surface of the horizontal locking piece 4. While moving leftward along the locking piece 4, it is introduced into the diagonal groove 7 recessed in the locking hole 5 of the locking piece 4, and rises together with the support leg piece 3 to emerge from the upper surface of the locking piece 4. , the hinge device C, which has the ball head 2 as a main body, can be opened and closed, and the lid 1 can be fully opened.

Note that when closing the lid 1, the above-described operations can be performed in the reverse order.

Furthermore, with reference to FIG. 4, a state in which the lid body 1 is prevented from floating will be described.

That is, as shown in Fig. 1, the manhole cover M
When the pipe is closed, when a horizontal rise occurs in the pipe, this water pressure is applied perpendicularly to the bottom surface of the lid 1, so that the protrusion 6 of the supporting leg piece 3 is engaged with the bottom surface of the locking piece 4. When the cover body 1 is stopped, the lid body 1 is closed as shown in FIG.
will float only slightly, but will be prevented from floating completely.

Effects of the invention The present invention has the structure described in the claims for utility model registration, and the structure exhibits the above-mentioned effects, thereby preventing the manhole cover from floating. It exhibits a desirable effect as a hinge device for use.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention. Figure 1 is a side sectional view of the entire manhole cover, Figure 2 is a partially enlarged side sectional view of the hinge device when the lid is closed, and Figure 3 is when the lid is opened. Fig. 4 is a partially enlarged side sectional view of the hinge device when preventing the lid from floating;
FIG. 5 is an enlarged cross-sectional view of the vicinity of the ball head, and FIG. 6 is an enlarged plan cross-sectional view of the locking piece. 1... Lid body, 2... Ball head, 3... Support leg piece, 4
...Locking piece, 6...Protrusion, 7...Diagonal groove, M...
...manhole cover.

Claims (1)

[Scope of utility model registration request] In a hinge device for opening and closing a manhole cover, which has a ball head as a main body, a locking piece for inserting a support leg piece of the ball head is attached to the other side of the lower surface of the cover body, which is equipped with a locking device on one side, outside the manhole. The locking piece projects horizontally from the inner circumferential surface of the frame, and the locking hole of the locking piece has left and right diagonal grooves for passing through the left and right protrusions slightly protruding on both sides of the support leg piece. A hinge device for preventing floating of a manhole cover, characterized in that it is configured to be recessed.