JP2520518Y2 - Locking device for iron cover for manhole - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a device for locking an iron lid for a manhole, and more particularly to a device for locking an iron lid for a manhole, which has a simple structure and can easily and reliably lock the iron lid. It relates to the device.

[Conventional technology]

An example of a conventional locking device for a manhole iron cover will be described with reference to the drawings.

FIG. 5 is a cross-sectional view showing a conventional locking device for a manhole iron cover, and FIG. 6 is a cross-sectional view taken along the line AA of FIG.

As shown in FIG. 5 and FIG. 6, the conventional locking device for iron cover for manhole has a hook 2 rotatably attached in a horizontal plane on the lower surface of the iron cover 1 and a lower surface of the iron cover 1. , And a lever 4 attached via a horizontal rotary shaft 3 parallel to the lower surface of the iron lid 1.

The tip 2A of the hook 2 engages with a stopper 6A formed on the receiving frame 6 of the iron lid 1. At the center of the rotation axis of the hook 2, a hand hook insertion hole 2B that matches the hook hole 1A formed in the iron lid 1.
Are formed vertically. A groove 2C into which one end 4A of the lever 4 is fitted is formed in the lower portion of the hook insertion hole 2B of the hook 2.

The other end 4B of the lever 4 has a weight function, whereby an upward force is constantly applied to the one end 4A of the lever 4.

According to the conventional locking device for the iron lid for manholes configured as described above, the iron lid can be opened and closed as follows.

First, in order to open the iron lid 1, use the hook 5 to hook 1A of the iron lid 1.
From the inside into the hook insertion hole 2B of the hook 2 and push down the tip 4A of the lever 4. In this way, the tip 4A of the lever 4
When is pushed down, the hook 2 rotates freely. Then, the hook 5 is rotated to remove the tip 2A of the hook 2 from the stopper 6A of the frame 6. Thereby, the locking of the iron lid 1 is released, and the iron lid 1 can be opened.

On the other hand, in order to lock the iron lid 1, after fitting the iron lid 1 into the receiving frame 6, the hand hook 5 is inserted from the hook hole 1A of the iron lid 1 into the hand hook insertion hole 2B of the hook 2. Next, the hook 5 is rotated to engage the tip 2A of the hook 2 with the stopper 6A of the frame 6. In this way, when the hook 2 is rotated to a position where it engages with the stopper 6A of the receiving frame 6, the tip of the lever 4
4A naturally fits into the groove 2C of the hook 2 by the weight of the lever 4, and the hook 2 is fixed. In this way,
The iron lid 1 is locked.

[Problems to be solved by the device]

However, the above-described conventional iron lid locking device for manholes has the following problems. That is,
Since the hook and the lever are provided independently of each other, the structure of the locking device is complicated, and moreover, since the hook rotates in the horizontal plane, dust and the like are accumulated on the rotating portion, which makes it difficult for the hook to rotate.

Therefore, the present invention provides a locking device for an iron lid for a manhole, which has a simple structure and can lock the iron lid easily and surely.

[Means for Solving the Problem] The first aspect of the present invention is that a pair of bearings fixed to each other and a pawl attached to the bearings are formed on the back surface of the manhole iron cover along the axial direction. A rotary shaft, a locking hook main body fixed to the lower part of the rotary shaft, a lever fixed to the rotary shaft at a right angle to the locking hook main body, and fixed to an inner surface of a receiving frame into which the iron lid is fitted. , A stopper with which the locking hook body engages, and an insertion hole formed in a peripheral portion of the iron lid into which a push-down rod for pushing down the tip of the lever is inserted. The present invention is characterized in that a long groove into which an end of the rotary shaft is inserted is formed, and an engaging surface with which the claw of the rotary shaft is engaged is formed in a lower portion of the long groove. The second one is fixed to the back of the manhole iron cover. A pair of bearings, a rotating shaft attached to the bearings, the rotating shaft having pawls formed in the axial direction, a locking hook body fixed to a lower portion of the rotating shaft, and the rotating shaft being perpendicular to the locking hook body. A lever fixed to the stopper, a stopper fixed to the inner surface of the receiving frame into which the iron lid is fitted, with which the locking hook body is engaged, and a tip of the lever formed on the peripheral portion of the iron lid. And a hook hole into which a hand hook for opening the iron lid is inserted.The bearing has a long groove into which the end of the rotary shaft is inserted, and a lower portion of the long groove is formed. It is characterized in that an engaging surface with which the claw of the rotary shaft is engaged is formed.

Next, an embodiment of the first locking device for a manhole iron cover of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic perspective view showing an embodiment of the first locking device for a manhole iron lid of the present invention, and FIG.
FIG. 3A is a sectional view showing the rotating shaft when the locking device is in a locked state, and FIG. 3B is a rotation view when the locking device is in an unlocked state. The sectional view showing the shaft and the same (C) diagram are sectional views showing the rotating shaft when the iron lid is closed in the same locking device.

1 to 3, reference numeral 7 denotes a pair of bearings fixed to the back surface of the manhole iron cover 1 so as to face each other. The bearing 7 is formed with a long groove 8 into which an end of a rotary shaft described later is inserted. The long groove 8 is inclined, and an engaging surface 8A with which a later-described claw of the rotary shaft is engaged is formed in the lower portion thereof.

Reference numeral 9 denotes a pawl attached to the bearing 7 in the axial direction.
9A is the formed rotating shaft. As described above, the pawl 9A engages with the engagement surface 8A of the bearing 7 to unlock the iron lid 1.

At the lower part of the rotary shaft 9, a locking hook body 10 is fixed whose tip engages with a stopper described later. The lower surface 10A of the tip of the locking hook body 10 is formed into a curved surface. This is because when the iron lid 1 is closed, the lower surface 10A of the tip hits the upper surface of the stopper, and as the iron lid 1 descends, the locking hook body 10 moves.
Smoothly rotate the rotating shaft 9 as a center to lock the hook body.
This is for retracting 10 from the stopper. A lever 11 is fixed to the rotating shaft 9 at a right angle to the locking hook body 10. The tip 11A of the lever 11 has an area that fits into an insertion hole, which will be described later, formed in the iron lid 1.

Reference numeral 12 is a stopper fixed to the inner surface of the receiving frame 6 into which the iron lid 1 is fitted, with which the tip of the locking hook body 10 engages.

Reference numeral 13 denotes an insertion hole formed in the peripheral portion of the iron lid 1 into which a push-down rod (not shown) for pushing down the tip of the lever 11 is inserted.

According to the first device for locking the iron lid for a manhole of the present invention, which is configured as described above, the iron lid can be locked and unlocked as follows.

First, when the iron lid 1 is fitted into the receiving frame 6, the locking hook body
The lower end 10A of the tip 10 contacts the upper surface of the stopper 12, and as the iron lid 1 descends, the locking hook main body 10 rotates around the rotation shaft 9 in the direction A in FIG. 1 and retracts from the stopper 12. At this time, since the locking hook body 10 contacts the stopper 12, the rotary shaft 9 is pushed up to the upper portion of the long groove 8 of the bearing 7 as shown in FIG. 3 (C). In this way, when the locking hook body 10 is completely released from the stopper 12,
This time, due to the weight of the locking hook main body 10, the tip of the locking hook main body 10 naturally rotates about the rotation shaft 9 in the direction B in FIG. 1 to the lower portion of the stopper 12. As a result, the iron lid 1 is locked. At the same time, the lever 11 also rotates, and its tip 11A closes the insertion hole 13 formed in the iron lid 1. Rotating shaft 9 when the iron cover 1 is locked
Moves to the lower part of the long groove 8 of the bearing 7, as shown in FIG. 3 (A).

Next, in order to unlock the iron lid 1, the tip 11A of the lever 11 is pushed down against the weight of the locking hook body 10 by a push rod (not shown). This enables the locking hook body
Since 10 is disengaged from the stopper 12, the locking of the iron lid 1 is released. At this time, the claw 9A of the rotary shaft 9 is shown in FIG. 3 (B).
As shown in FIG. 5, since it engages with the engaging surface 8A of the long groove 8 of the bearing 7, the iron lid 1 is not locked again even if the hand hook is pulled out.

To open the iron lid 1, a hand hook (not shown) may be inserted into the hook hole 1A formed in the iron lid 1 and the iron lid 1 may be lifted.

When the iron lid 1 is opened, a hand hook may be inserted into the insertion hole 13 instead of the hook hole 1A to unlock and then open the iron lid 1.

Next, one embodiment of the second locking device for the manhole iron lid of the present invention will be described with reference to the drawings.

FIG. 4 is a schematic perspective view showing one embodiment of the second locking device for manhole iron lids of the present invention.

As shown in FIG. 4, the second locking device of the present invention is
It differs from the locking device shown in FIG. 1 only in the following points.

That is, in this locking device, the lever 14 is fixed to the rotating shaft 9 at a right angle to the locking hook body 10, and the tip 14A thereof has an area enough to close the hook hole 1A of the iron lid 1 from below.

In this case, it is not always necessary to form the insertion hole 13 in the iron lid 1, but if the insertion hole 13 is formed, the iron lid 1 can be opened more easily by inserting the prying bar.

To open the iron lid 1, insert a hand hook into the hook hole 1A and push the tip 14A of the lever 14 downward against the weight of the locking hook body 10. As a result, the locking hook body 10 becomes a stopper.
Since it is disengaged from 12, the locking of the iron lid 1 is released. After that, the iron lid 1 can be opened by pulling up the hook. The locking of the iron lid 1 is similar to the above case.

[Effect of device]

As described above, according to the present invention, the lever 11 and the locking hook main body 10 are integrally movable via the rotating shaft 9, so that the structure is simple, and the rotating shaft 9 serves as the bearing 7. Since it is inserted into the formed slanted long groove 8, dust and the like are hard to collect in the rotating portion, and the rotating shaft 9 always rotates smoothly, which is a useful effect.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a locking device for a manhole iron cover according to the first aspect of the present invention, and FIG. 2 is a view taken in the direction of A ′ in FIG. 1, and FIG. Is a cross-sectional view showing the rotary shaft when the locking device is in a locked state, FIG. 9B is a cross-sectional view showing the rotary shaft when the locking device is in an unlocked state, and FIG. In the apparatus, a cross-sectional view showing a rotating shaft when the iron lid is closed, FIG. 4 is a schematic perspective view showing an embodiment of a second iron lid locking device for manholes of the present invention, and FIG. Sectional drawing which shows the conventional locking device of the iron cover for manholes, FIG. 6 is the sectional view on the AA line of FIG.
In the drawings, 1 ... iron lid, 2 ... hook, 3 ... rotary shaft, 4 ... lever, 5 ...
Hand hook, 6 ... Receiving frame, 7 ... Bearing, 8 ... Long groove, 9 ... Rotating shaft,
10 ... Locking hook body, 11 ... Lever, 12 ... Stopper, 13 ... Insertion hole, 14 ... Lever.

Front page continuation (72) Takashi Shimizu Creator Takashi Shimizu 3-16-9 Kanda, Chiyoda-ku, Tokyo Inside Nippon Cast Iron Pipe Co., Ltd. (72) Seiji Karasawa 690-6 Sanuki-cho, Ryugasaki-shi, Ibaraki (56) Reference References Actual development Sho 64-47851 (JP, U) Actual development Sho 60-100448 (JP, U)

Claims (2)

(57) [Scope of utility model registration request] 1. A pair of bearings fixed to each other on the back surface of an iron lid for a manhole, a rotary shaft attached to the bearings and having a pawl extending in the axial direction, and a lower part of the rotary shaft. A fixed locking hook main body, a lever fixed to the rotating shaft at a right angle to the locking hook main body, and a stopper fixed to the inner surface of the receiving frame into which the iron lid is fitted, with which the locking hook main body engages. And an insertion hole formed in a peripheral portion of the iron lid, into which a push-down rod for pushing down a tip of the lever is inserted, and an end of the rotary shaft is inserted into the bearing. A locking device for an iron lid for a manhole, wherein a long groove is formed, and an engaging surface with which the claw of the rotating shaft is engaged is formed in a lower portion of the long groove. 2. A pair of bearings fixed to each other on the back surface of the manhole iron cover, a rotary shaft attached to the bearings, the rotary shaft having pawls formed in the axial direction, and a lower part of the rotary shaft. A fixed locking hook main body, a lever fixed to the rotating shaft at a right angle to the locking hook main body, and a stopper fixed to the inner surface of the receiving frame into which the iron lid is fitted, with which the locking hook main body engages. , A hook hole formed near the peripheral edge of the iron lid, which pushes down the tip of the lever downward, and into which a hand hook for opening the iron lid is inserted,
A long groove into which an end of the rotary shaft is inserted is formed in the bearing, and an engaging surface with which the claw of the rotary shaft is engaged is formed in a lower portion of the long groove. , Iron lid locking device for manhole.