JPS5930065Y2 - Manhole locking device - Google Patents

Description

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

Manpoles are used for sewage basins, septic tanks, fire prevention tanks, oil tanks, electrical and
It is used in places where it is necessary to prevent the intrusion of dirt and sewage from the outside, such as the entrance and exit of gas piping grooves, and in places where it is necessary to maintain cleanliness at all times.

Therefore, manholes require devices to prevent illegal dumping of dangerous materials and people from falling into them, and to prevent theft of internal devices or lids.

Conventionally, as a locking device to prevent unauthorized opening and closing of a manhole cover, the locking lever at the lower end of the cylinder lock attached to the cover abuts against the lever wheel holder of the manhole frame.
There is a structure that prevents the reverse twisting of a lid that is fitted into a manhole frame and twisted, but because the locking lever attached directly to the lower end of the cylinder lock comes into contact with the lever wheel holder,
If a person, car, or other heavy object passes over the lid, or if the lid is accidentally locked or someone tries to twist the lid, excessive force is applied to the cylinder lock, causing the cylinder lock to break and cause the manhole to open. It had some drawbacks, such as the lid not opening.

This invention was made with the aim of improving the above-mentioned drawbacks of conventional manhole locking devices.The lid can be closed by fitting and twisting into the manhole frame, and the lid can be opened by twisting it in the opposite direction. To provide a locking device for a manhole which is not easily broken even if a heavy object passes over the cover of the manhole or an excessive force is applied to the cover during locking.

This invention consists of a plate 8 fixed to the inner surface of the lid at the bottom of a recess H formed on the top surface of the lid, and a Shinonda lock 7 provided through the bottom of the recess H and the plays 1 to 8. , a plate 9 fixed to the lower end of the movable part of the cylinder lock 7 projecting downward from the plate 8, and a protrusion 11 whose end is bent or provided with a protrusion in a hole 10 provided in the plate 1-9.
The locking lever 11 into which a is inserted and locked, and the manhole frame 2
The lever holder consists of part 6, and the bent edge 8a of the plate 8 has a guide part 8b made of a hole or notch that guides the forward and backward movement of the lock lever 11 by the rotation of the movable part of the cylinder lock 7. is provided, and by the free movement of the locking lever 11, the tip of the locking lever 11 is brought into contact with or released from the lever wheel support part 6, thereby making it possible to stop or release the reverse twisting of the lid 1 by 1iH. 3. This invention will be described in detail below with reference to embodiments shown in the drawings.

A manhole cover 1 fits into a manhole frame 2 having a corresponding hole.

A plurality of protrusions 3 are provided near the outer periphery of the inner surface of the lid 1, and a plurality of protrusion receivers are provided with grooves 4 on the upper periphery of the hole of the frame 2 corresponding to the protrusions 3.
will be established.

These projections 3 and the groove 4 form a so-called bayonet type engagement.

The protrusion receiver forms a rotation limiting portion 5 of the lid 1 at one end of the portion 4 (the right end of the protrusion receiver in FIG. 1).

When the lid 1 is twisted after being fitted into the frame 2, the lid cannot be opened unless the lid is twisted in the opposite direction.

The rotation restricting portion 5 is for preventing excessive twisting.

A protruding lever support part 6 is provided on a part of the inner circumference of the frame 2, a cylinder lock 7 is provided in a recess H formed on the top surface of the lid 1, and the lower end of the movable part of the cylinder lock 7 is recessed. It penetrates the bottom wall of location H and the play 1-8, which has an angular cross-section and is fixed to the inner surface of the manhole cover on the bottom wall, and projects downward, and the lower end of the movable part is connected to the play 1-8. Plate 9 with intervals in between.
Connect and secure with fastening means such as bolts or nuts.

Therefore, with the L-shaped locking lever 11 sandwiched between the plates 8 and 9, the end of the locking lever 11 is bent into the hole 10 provided near the periphery of the plate 9. The protrusion 11a is inserted and loosely engaged, and the locking lever 11 is guided by a hole or notch provided in the downwardly bent edge 8a of the plate 8 in response to rotation of the cylinder lock. The locking lever 11 is installed so that it can freely move while being guided by the portion 8b.

In this case, the protrusion 11a may be formed by bending one end of the locking lever at a right angle, or may be provided with a protrusion protruding from the end of the locking lever.

When the locking lever 11 is rotated, the plate 9 rotates around the cylinder, and the edge of the hole 10 pushes the protrusion 11a, causing the locking lever 11 to protrude, and its tip touches the frame 2. The lever wheel holder is locked in contact with the part 6, and when the cylinder lock 7 is rotated in the opposite direction, the protrusion 11a is pulled by the edge of the hole 10 of the plate 9, and the tip of the locking lever 11 is pulled. The length of the lever wheel holder is such that it is removed from part 6.

Furthermore, instead of installing the locking lever 11 in a state where it is narrowed between the plates 8 and 9 as described above, the locking lever 11 is
The protrusion 11a may be inserted into the hole 10 from below the plate 9 and locked by providing seven large stoppers.

The shape of the plate 9 and the hole 10 in FIG. 3 shows the case where the opening/closing angle of the cylinder lock is 90°, and the hole 10 is formed in a sector shape centered on the rotation axis of the cylinder lock 7. If the cylinder lock angle is different, plate 9 and hole 10
The shape of is also different.

For example, if the opening/closing angle of the cylinder lock is approximately 30 degrees, a plate shaped as shown in Figure 4 may be used, and the lock lever
The protrusion 11 a of No. 11 may be inserted into the hole 10 without moving freely.

A stopper 12 may be provided at the tip of the lever to prevent the protrusion 11a from coming off the guide portion 8b when the locking lever 11 is pulled.

A small lid 13 is screwed into the -L portion of the recess H via a backing to prevent rainwater or foreign matter from entering.

To operate the locking device according to this invention, the lid 1 is fitted into the frame 2, the lid 1 is twisted in the A direction to prevent the lid from moving in the -L direction, and then the small lid 13 is removed. cylinder B
direction, the tip of the locking lever 11 comes into contact with the lever wheel holder 6, and the small lid 13 is screwed in again.

As a result, the locking lever 11 prevents the lid 1 from being twisted in the opposite direction, making it impossible to open the lid 1.

If it is necessary to open the lid 1, remove the small lid 13,
The lid 1 can be opened by rotating the cylinder lock in the C direction, pulling the locking lever, removing its tip from the lever wheel support part 6, and twisting the lid 1 counterclockwise and lifting it.

According to this invention, the locking lever 11 is connected to the movable part of the cylinder lock via the play 1-9, so that when the lid is locked, the force caused by people or cars passing by is indirectly applied to the Shinonda lock. There is no risk of damaging the cylinder lock, the cylinder is simple in structure, and it has excellent effects such as locking and opening/closing the lid smoothly.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, in which Fig. 1 is a plan view with a part of the manhole cut away, Fig. 2 is a cross-sectional explanatory view of the main part of the manhole where the locking device is attached, Fig. 3, and FIG. 4 is a bottom view of the locking device.

Claims (1)

[Scope of utility model registration request] In a manhole that is closed by fitting the manhole cover into a frame and twisting it, a plate 8 is fixed to the inner surface of the cover at the bottom of a recess H formed on the top surface of the cover 1, and a plate 8 is connected to the bottom of the recess H. The cylinder lock 7 and the play 1
- A plate 9 fixed to the lower end of the movable part of the cylinder lock 7 projecting downward from 8, and a hole 1 provided in the plate 9.
A protrusion 11a formed by bending the end or providing a protrusion at 0
The locking lever 11 inserted and engaged with the lever holder of the manhole frame 2 is connected to the part 6, and the bent edge 8 of the plate 8
A is provided with a guide portion 8b consisting of a hole or a notch that guides the forward and backward movement of the locking lever 11 by the rotation of the movable part of the cylinder lock 7. A locking device for a manhole, characterized in that the lever holder is brought into contact with or released from a portion 6 to prevent or release the cover 1 from twisting in the opposite direction.