JP3419730B2 - Locking device for iron lid - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for an iron lid, and more particularly, it is possible to reliably prevent sand or earth and sand from entering into a manhole from a burr hole and to prevent rainwater from being disturbed in a manhole during heavy rain. When a steel lid is installed on a sloped ground due to an external force such as a flow, the locking hook rotates in the unlocking direction due to an external force due to vibration of the vehicle running,
The present invention relates to a locking device for an iron lid that does not unintentionally unlock.

[0002]

2. Description of the Related Art As a locking device for locking a manhole leading to water and sewerage, electric power, a pit for communication equipment, etc., Japanese Utility Model Publication No. 7-56357 discloses the following locking device. Hereinafter, this conventional locking device will be described with reference to the drawings.

FIG. 14 is an exploded perspective view showing a conventional locking device, 15 is a sectional view showing a locked state by the conventional locking device, and FIG. 16 is a sectional view showing an unlocked state by the conventional locking device.

14 to 16, reference numeral 1 denotes a locking hook, which is a burl hole 2A formed in a manhole iron cover 2.
Is rotatably attached to the lower surface of the pin by a pin 1A. The locking hook 1 is formed with a hook 1B that engages with a locking protrusion 3A formed on the inner surface of the receiving frame 3 and an unlocking protrusion 1C having an inclined upper surface. Reference numeral 4 denotes an elastic body inserted between the locking projections 3A of the locking hook 1, and 5 denotes a lid for closing the burl hole 2A, which is attached to the upper surface of the elastic body 4. The elastic body 4 and the lid body 5 are fixed to the upper portion of the locking hook 1 by long bolts 6, nuts 7 and sleeve tubes 8.

According to the conventional locking device constructed as described above, the iron lid is opened and closed as follows.

[0006] When the lid is opened, first, the T-shaped tip portion 9A of the burl 9 is inserted obliquely into the burl hole 2A so as to match the radial direction of the iron lid 2. As a result, the lid body 5 becomes the elastic body 4
It is pushed down against the elastic force of. Then, as shown in FIG. 16, the burl 9 is rotated 90 degrees around the axis so that the T-shaped tip portion 9A comes into contact with the inclined upper surface of the unlocking projection 1C of the locking hook 1. Then, the burl 9 is pulled toward you. As a result, the T-shaped tip portion 9A of the burl 9 moves while sliding on the inclined upper surface of the unlocking projection 1C, with the upper surface abutting the lower surface of the burl hole 2A. As a result, a force that pushes down the locking hook 1 is applied, and the hook 1B of the locking hook 1 rotates about the pin 1A in a direction away from the locking protrusion 3A of the receiving frame 3. This unlocks. Then, if the burl 9 is further pulled toward you, the lid is opened.

On the other hand, when the lid is closed, the iron lid 2 may be fitted into the receiving frame 3 as it is. Since the locking hook 1 freely rotates about the pin 1A, as shown in FIG.
The hook 1B is naturally positioned below the locking projection 3A of the receiving frame 3. In this way, locking is performed at the same time when the lid is closed.

According to the above-described conventional locking device, unlocking at the time of opening the lid can be performed only by pushing down the lid 5 by the burl 9 and then pulling the burl 9 toward the front side. Since the lid body 5 is pressed against the burl hole 2A by the elastic force of the body and naturally closes the burl hole 2A, it is possible to reliably prevent the entry of sand or earth into the manhole from the burl hole 2A. The effect is brought.

[0009]

However, the conventional locking device described above has the following problems. When the lid shown in FIG. 15 is closed, the locking hook 1 rotates in the unlocking direction due to the turbulent flow of rainwater generated in the manhole during heavy rain or the discharge of air generated before the rainwater overflows outside the manhole. There was a risk that the lock would be released unexpectedly. Since the lid body 5 is only pressed against the burl hole 2A by the elastic body 4, when the iron lid 2 is installed on a sloping ground, the locking hook 1 moves to the elastic body 4 due to vibrations caused by running of the vehicle. Rotate in the unlocking direction against the elastic force,
There was a risk that the lock would be released unexpectedly.

Therefore, an object of the present invention is to prevent the intrusion of sand or earth and sand from the burl hole into the manhole, and to prevent external force due to turbulent flow of rainwater or the like occurring in the manhole during heavy rain, and sloped land. When an iron lid is installed on the
An object of the present invention is to provide a locking device for an iron lid, in which there is no fear that the locking hook will rotate in the unlocking direction and the locking will be unexpectedly released.

[0011]

The invention according to claim 1 is
A locking hook that is rotatably attached to the lower surface of the burr hole formed in the iron lid and has a hook that engages with a locking protrusion formed on the inner surface of the receiving frame into which the iron lid is fitted, and the burr hole is closed. In a locking device for an iron lid provided with a lid body for, a guide rod provided at a lower surface of the lid body in the vicinity of the burr hole, and having a lower end having an engaging projection that engages with a lower portion of the locking hook. , A lid mounting seat provided on the lower surface of the iron lid and having an opening for inserting the guide rod, and the lid mounted between the lid and the lid mounting An elastic body for closing the burr hole is provided, and when the burl hole is closed by the lid, the engagement protrusion of the guide rod is kept in a locked state by engaging with the locking hook. , The elasticity of the elastic body When pushed down against the lock bar, the locking hook is characterized by rotating in the unlocking direction by the weight of the locking hook while holding the engagement of the guide bar with the engaging projection. .

The invention according to claim 2 is characterized in that the elastic body is composed of a coil spring inserted into the guide rod.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a lock device for an iron lid of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing a locking hook of an iron lid locking device of the present invention, FIG. 2 is a plan view showing a locking hook of the iron lid locking device of the present invention, and FIG. A direction view, FIG.
FIG. 7 is a bottom view showing a lid mounting seat of the iron lid locking device of the present invention, FIG. 5 is a sectional view taken along the line AA of FIG. 4, FIG. 6 is a sectional view taken along the line BB of FIG. FIG. 8 is a front view showing a guide rod with a lid of the iron lid locking device of the present invention, FIG. 8 is a view in the direction A of FIG. 7, and FIG. 9 is a locking hook and lid of the iron lid locking device of the present invention. FIG. 10 is a cross-sectional view showing a state in which the T-shaped tip 9A of the burl is applied to the lid when the lid is opened, and FIG. 11 is a cross-section showing a state in which the burl is slightly pushed down. 12 and 13 are sectional views showing a state in which the burl is rotated by 90 degrees, and FIG. 13 is a sectional view showing a state in which the burl is pulled toward you. Note that, in FIGS. 10 to 14, the lid and the guide rod are not hatched.

In FIGS. 1 to 13, reference numeral 10 denotes a locking hook, which is provided with a pin 10A on the lower surface of a burr hole 11A formed in a manhole iron lid 11 in the radial direction thereof.
1 is attached so as to be rotatable in the radial direction. Locking hook 1
At 0, there are a hook 10B that engages with a locking projection 12A formed on the inner surface of the receiving frame 12, a slit 10C into which a lower portion of a guide rod described later enters, and a lower vertical back surface 10D that engages with an engagement projection described later. Has been formed.

Reference numeral 13 is a lid for closing the burl hole 11A. Reference numeral 14 is a guide rod provided on the lower surface of the lid body 13. An engaging protrusion 14A that engages with the lower vertical back surface 10D of the locking hook 10 is formed at the lower end of the guide rod 14.

Reference numeral 15 denotes a lid mounting seat provided on the lower surface of the iron lid 11 near the burl hole 11A. Cover mounting seat 1
An opening 15 </ b> A for inserting the guide rod 14 is formed at 5. The insertion opening 15A is formed in the engagement protrusion 1 of the guide rod 14.
4A is formed so as to be slightly inclined so as to engage with the lower vertical back surface 10D of the locking hook 10. That is, the guide bar 14 is formed so as to incline toward the receiving frame 12 side.

Reference numeral 16 is a compression coil spring as an elastic body arranged around the guide rod 14 between the lid 11 and the lid mounting seat 15. The coil spring 16 has a function of pushing up the lid 13 and closing the burl hole 11A.

According to the iron lid locking device of the present invention having such a configuration, the iron lid is opened and closed as follows.

When the lid is opened, first, as shown in FIG.
Attach the T-shaped tip 9A of the burl 9 to the burl hole 11 of the iron lid 11.
It is applied almost vertically to the upper surface of the lid 13 that closes A.

Next, as shown in FIG. 11, the burl 9 is slightly pushed down. As a result, the lid 13 is pushed down against the elastic force of the coil spring 16. In this way, when the lid 13 is pushed down, the guide rod 14 is also pushed down integrally with the lid 13. At this time, the guide rod 1
As 4 is pushed down, the locking hook 10 keeps the engagement between the engaging projection 14A of the guide rod 14 and the lower vertical back surface 10D of the locking hook 10 and the hook 10 is pulled by its own weight.
B rotates about the pin 10A in the direction away from the locking protrusion 12A. As a result, unlocking is performed.

Next, as shown in FIG.
Rotate about 0 degrees around the axis. Then, as shown in FIG. 13, when the burl 9 is pulled toward you, the T-shaped tip portion 9A of the burl 9 comes into contact with the lower surface of the burl hole 11A and the iron lid 11
Is lifted and the lid is opened. At this time, the lid 13 is slightly lifted by the elastic force of the coil spring 16, but there is no problem because the locking hook 10 is rotated to the position where the engagement between the hook 10B and the locking projection 12A is released. .

On the other hand, when the lid is closed, the iron lid 11 is received as it is while the lid 13 is pushed down by the burl 9.
Just fit it in. After closing the lid, set the burl 9 to the burl hole 11A.
When the lock hook 10 is pulled out from the lock spring, the lock hook 10 is rotated in the lock direction by the elastic force of the coil spring 16, and the lock is naturally performed.

After the lid is closed, as shown in FIG. 10, the engaging projection 14A of the guide bar 14 is engaged with the lower vertical rear surface 10 of the locking hook 10.
Since it is in contact with D, even if external force in the unlocking direction acts on the locking hook 10 due to the turbulent flow of rainwater generated in the manhole during heavy rain or the discharge of air generated before the rainwater overflows outside the manhole. Alternatively, the locking hook 10 does not rotate in the unlocking direction even when an external force such as vibration caused by traveling of the vehicle acts on the iron lid 11 installed on the sloping ground.

[0025]

As described above, according to the present invention, by separating the locking hook and the cover for closing the burr hole, it is possible to reliably prevent the entry of sand or earth from the burr hole into the manhole. Of course, the turbulent flow of rainwater that occurs in the manhole during heavy rain, or the discharge of air that occurs before the rainwater overflows outside the manhole, causes an external force in the unlocking direction to act on the locking hook, or The locking hook does not rotate unless the lid is pushed down even if an external force such as vibration due to the running of the car acts on the iron lid installed on the sloping ground. This brings about a useful effect that there is no fear of turning on the contrary.

[Brief description of drawings]

FIG. 1 is a front view showing a locking hook of an iron lid locking device of the present invention.

FIG. 2 is a plan view showing a locking hook of the iron lid locking device of the present invention.

FIG. 3 is a view from the direction A in FIG.

FIG. 4 is a bottom view showing a lid mounting seat of the iron lid locking device of the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a cross-sectional view taken along the line BB of FIG.

FIG. 7 is a front view showing a guide rod with a lid body of the iron lid locking device of the present invention.

FIG. 8 is a view from the direction A in FIG.

FIG. 9 is an assembled perspective view of a locking hook and a guide rod with a lid of the iron lid locking device of the present invention.

FIG. 10 is a cross-sectional view showing a state in which the T-shaped tip portion 9A of the burl is applied to the lid body when the lid is opened.

FIG. 11 is a cross-sectional view showing a state in which the burl is slightly pushed down.

FIG. 12 is a sectional view showing a state in which the burl is rotated 90 degrees.

FIG. 13 is a cross-sectional view showing a state in which the burl is pulled toward you.

FIG. 14 is an exploded perspective view showing a conventional locking device.

FIG. 15 is a cross-sectional view showing a locked state by a conventional locking device.

FIG. 16 is a cross-sectional view showing an unlocked state by a conventional locking device.

[Explanation of symbols]

1: Locking hook 1A: Pin 1B: Hook 1C: Protrusion 2: Iron lid 2A: Bar hole 3: Received frame 3A: Locking protrusion 4: Elastic body 5: Lid 6: Long bolt 7: Nut 8: Sleeve tube 9: Bar 9A: T-shaped tip 10: Locking hook 10A: Pin 10B: Hook 10C: Slit 10D: Lower vertical back 11: Iron lid 12: Received frame 12A: Locking protrusion 13: Lid 14: Guide rod 14A: engagement protrusion 15: lid mounting seat 15A: insertion opening 16: Coil spring

Continuation of the front page (56) Reference JP-A-2-183019 (JP, A) JP-A-7-34477 (JP, A) Actual opening 4-41539 (JP, U) Actual opening 5-47046 (JP , U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) E05B 65/00 E02D 29/14

Claims (2)

(57) [Claims] 1. A locking hook, which is rotatably attached to a lower surface of a burr hole formed in an iron lid, and has a hook that engages with a locking protrusion formed on an inner surface of a receiving frame into which the iron lid is fitted, In an iron lid locking device including a lid for closing the burl hole, a guide rod provided on a lower surface of the lid, having a lower end thereof with an engagement protrusion engaging with a lower portion of the locking hook. A lid mounting seat provided on a lower surface of the iron lid near the burl hole and having an opening for inserting the guide rod; and the lid mounted between the lid and the lid mounting seat. An elastic body for pushing up the body to close the burl hole, and when the burl hole is closed by the lid,
Locking is maintained by engaging the engaging projection of the guide rod with the locking hook, and when the lid is pushed down against the elastic force of the elastic body, the locking hook is A locking device for an iron lid, which is rotated in the unlocking direction by the weight of the locking hook while maintaining the engagement with the engagement protrusion. 2. The elastic body comprises a coil spring inserted in the guide rod.
Locking device for the iron lid described.