JPH0721634Y2 - Manhole cover locking and lifting equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a device for locking and lifting a manhole cover.

[0002]

2. Description of the Related Art In a conventional manhole cover, a locking and unlocking device uses a key regardless of a lifting device. To lift the cover, a hole is formed in the cover in addition to the key. A rod is hooked on the edge of the hole to lift the lid.

[0003]

Since the conventional manhole cover is provided separately without being associated with the locking device and the lifting device, the locking / unlocking key and the lifting device are You need both. In addition, it takes time to unlock and lift.

An object of the present invention is to associate a locking device with a lifting device so that the locking / unlocking key also serves as a lifting rod.

[0005]

[Means for Solving the Problem] A hook is projected on a side surface,
The side surface and the front surface of the hook portion, in the main body in which a series of arc-shaped surfaces are formed, an arm having a rotating shaft at the tip is provided upright, and a key provided with a through hole in the main body, and a notch in the peripheral portion, Alternatively, a hole is provided, and a mechanism for rotatably supporting the pivot shaft of the key is provided at the notch on the back surface or both sides of the hole, and the mechanism is provided on the back surface near the notch or the hole. And, in the center direction of the lid, a lid provided with a protrusion, a frame provided with a protrusion for locking the hook portion of the key on the inner wall surface, the tip portion is bent, and the tip portion thereof, A bar having a hole into which a protrusion on the back surface of the lid can be inserted forms a manhole cover locking and lifting device.

[0006]

The series of arcuate surfaces formed by the hook of the key and the side surface of the main body are pushed by the weight of the lid when the lid is closed and do not slide down the tips of the protrusions on the inner surface of the frame to prevent the lid from being closed.

When the lid is closed, the upper surface of the hook portion of the key is located below the protrusion on the inner surface of the frame. When the lid is lifted, the upper surface of the hook portion abuts the lower surface of the protrusion on the inner surface of the frame, and Prevent lifting.

The pivot shaft at the tip of the arm of the key is rotatably supported by the support mechanism on the back surface of the lid and serves as the pivot shaft of the key.
Since the arm of the key is attached at a biased position on the key body, the key is urged in the protruding direction of the frame with the pivot shaft as a fulcrum.

The through hole of the key allows the insertion of the tip of the burl, and the tip of the burl inserted in the through hole pushes the lower part of the inner surface of the through hole of the key to rotate the key, so that the hook of the key is The position is moved from below the protrusion of the frame toward the protrusion on the back surface of the lid, and the through hole of the key is located below the tip of the protrusion of the lid.

By pulling up the burl in the above-mentioned state, the protrusion on the back surface of the lid is inserted into the hole at the tip portion, and by further pulling up the burl, the lid is lifted.

[0011]

Embodiments of the present invention will be described with reference to the drawings. On the inner wall of the manhole frame 1 is a shelf 3 that supports the edge of the lid 2.
And a protrusion 6 that engages with the hook 5 of the key 4.

The key 4 has arms 9, 9 standing upright on the peripheral side of a main body 8 having a through hole 7 having openings at the top and bottom. The side surfaces of the arms 9 and 9 at right angles to the opposite surfaces are connected to the side surface of the main body 8 on the side surface or are located close to the side surface. That is, the arms 9 and 9 are provided at positions deviated from the center of gravity of the main body 8. Below the side surface of the main body 8, a hook portion 5 serving as a protrusion for engaging with the lower surface of the protrusion 6 of the frame 1 is provided. In addition, the weight 1
Set 0 and 10.

Shafts 11, 11 are provided at the tips of both arms 9, 9 so as to project in mutually opposite directions.

A notch 12 is provided on the upper edge of the main body 8 on the circumferential side opposite to the circumferential side on which the hook portion 5 is provided.

The arms 9 and 9 may be one. In this case, the weights of the weight units 10 and 10 are provided with a difference to achieve balance.

The same effect can be obtained by increasing the thickness of the side surface of the main body without providing the weight parts 10 and 10 in particular.

A notch 13 or a hole is provided in the peripheral edge of the lid 2, bearing projections 14 and 14a are provided on both sides of the notch 13, and holes 1 having openings facing the opposite side surfaces thereof.
5, 15a are provided. Hole 15 in one bearing projection 14
Has a shape in which one shaft portion 11 of the key 4 can be rotatably inserted, and the hole 15a of the other bearing projection 14a is a long hole.

The shaft projections 11, 11 of the key 4 are used as the bearing projections 1.
In order to support the shafts 4 and 14a, one shaft portion 11 is first inserted into the hole 15, and the other shaft portion 11 is inserted from the end of the hole 15a toward the inside of the lid 2, and the shaft inserted into the hole 15 is inserted. With the part 11 as a fulcrum, the shaft part inserted in the hole 15a
It is moved in the peripheral direction of the lid 2, and the shaft holder 16 is inserted into the hole 15a.
Insert and fix.

The mounting structure of the key 4 on the back surface of the lid 2 is not limited to the above-mentioned embodiment, and other known structures can be adopted.

On the back surface of the lid 2, a protrusion 17 is hung at a position slightly closer to the center than the notch 13. Protrusion 17
It is preferable that the diameter of the medium is reduced.

FIG. 1B is a sectional view of an essential part of the burl 18 for unlocking and lifting the lid, and FIG. 1C is a bottom view of the essential part. The burr 18 has a bent front end portion 18a, and a hole 19 is provided at the front end portion thereof.

The operating state of the device according to the present invention during use will be described with reference to FIG. As shown in FIG. 4 (A), the lid 2
When the key 4 is lowered into the frame 1, first, the side surface of the main body 8 on which the hook portion 5 is formed has a curved surface, so that the key 4 is pushed by the tip of the protrusion 6 of the frame 1 to slide, and the hook portion 5 projects. When separated from the tip of the part 6, the key 4 acts by the weight part 10 to be vertical, the tip of the hook part 5 is located below the lower surface of the protrusion 6, and the lower end of the peripheral edge of the lid 2 is the shelf part of the frame 1. It is supported by 3 and the closing of the lid is completed.

In the state where the lid is closed, the upper surface of the hook 5 is the protrusion 6 of the frame 1 simply by lifting the peripheral edge of the lid 2.
The peripheral edge of the lid 2 does not lift by abutting the lower surface of the
I can't open the lid.

In order to open the lid, as shown in FIG. 4 (B), the burr 18 is provided in the notch 13 and the tip portion 18a thereof.
And then into the through hole 7 of the key 4.

Then, as shown in FIG.
When the tip portion 18a of 8 is rotated to orient the hole 19 in the vertical direction, the tip portion 18a is bent. Therefore, when the tip portion 18a is further pushed, the tip of the tip portion 18a causes the body 8 of the key 4 to move.
By pushing the side portion below the notch 12, the key 4 is rotated in the direction of the protrusion 17 with the shaft portion 11 as a fulcrum, and the hook portion 5 of the key 4 is rotated.
The tip of the bar 1 is separated from below the lower surface of the protrusion 6 of the frame 1,
8 holes 19 are located below the protrusions 17.

When the burl 18 is lifted, the protrusion 17 is inserted into the hole 19 of the tip end portion 18a of the burl 18, and when the burl 18 is further lifted, the lid is lifted from its peripheral edge to open the lid.

[0027]

The locking and lifting device for the manhole lid according to the present invention can be locked simply by placing the lid on the frame.
Unlocking and lifting the lid can be done with a single bar. It is also easy to operate and does not require much force.

[Brief description of drawings]

FIG. 1A is a sectional view of an essential part of a manhole, FIG. 1B is a sectional view of an essential part of a burl, and FIG. 1C is a bottom view of an essential part of a burl.

FIG. 2 is a perspective view of a key.

FIG. 3 is a bottom view of the main part of the lid.

4A to 4D are explanatory views in the order of operation steps of the apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 2 Lid 3 Shelf 4 Key 5 Hook 6 Protrusion 7 Through hole 8 Main body 9 Arm 10 Weights 11 Shaft 12 Notch 13 Notch 14, 14a Bearing protrusion 15, 15a Hole 16 Shaft holder 17 Protrusion 18 bar 18a Tip 19 hole

Claims (1)

[Scope of utility model registration request] 1. An arm having a turning shaft at its tip is erected on a main body in which a hook portion is projected on a side surface, and the side surface and the front surface of the hook portion form a series of arc-shaped surfaces, and the main body penetrates the main body. A key with a hole and a notch or hole in the peripheral edge, and a mechanism for rotatably supporting the pivot shaft of the key in the notch or both sides of the hole on the back surface. , The notch on the back,
Alternatively, a lid provided with a protrusion near the hole and in the center direction of the lid, a frame provided with a protrusion for locking the hook portion of the key on the inner wall surface, and the tip portion is bent, A device for locking and lifting a lid of a manhole, which comprises a burl provided at its tip with a hole into which a protrusion on the back surface of the lid can be inserted.