JPS5851248Y2 - manhole cover - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an opening/closing mechanism for a manhole cover.

Since manhole covers are usually made of cast iron, opening and closing a relatively large-diameter manhole cover when a working tool is in or out is a difficult task that requires a great deal of force due to its large weight.

To open or close a heavy manhole cover, hold it upside down.
Since it is extremely dangerous to turn the lid 80 degrees, the general method is to open and close the lid by lifting one end of the lid and using the periphery of the receiving frame as a fulcrum and rotating it horizontally 180 degrees.

However, even with this method, when opening the lid, the most force is required to lift one end of the lid to the periphery of the receiving frame, and when closing the lid, the lid must be swiveled back to its original position and placed correctly in the receiving frame. It is often difficult to insert.

The present invention provides a light, reliable, and safe mechanism for opening and closing even relatively large-diameter manhole covers.

The present invention will be described below with reference to the drawings showing embodiments.

FIG. 1 is a top perspective view of a manhole cover according to the present invention in an exploded state, and FIG. 2 is a bottom perspective view of the same state.

The lid 11 has a disc shape, and on its upper surface is a rectangular fishing tag recess 1 with a hook 12 fixed to the inner surface for lifting the lid.
3, a pair is provided facing the target position from near the outer periphery toward the center.

The outer circumferential side surface 14 of the lid 11 is a tapered surface whose diameter decreases downward so as to fit into the inner circumferential side surface 22 of the receiving frame.
In order to facilitate fitting into the receiving frame, a stepped portion is provided in the middle, and the tapered surface below this stepped portion is set back from the tapered surface above this.

Reference numeral 15 denotes a through hole into which the pin 31 is loosely fitted, and the fishing tag recess 1
3 is perpendicularly perforated at an appropriate position near the outer periphery on the center line, but a portion of this through hole may overlap with the fishing tag recess 13.

As shown in the sectional view of FIG. 3, the structure of the through hole 15 consists of a large diameter upper part 15a and a small diameter lower part 15b.

15a should have a size that allows the pin head 32 to be inserted easily, while 15b is preferably slightly larger than the diameter of the pin and has an arcuate cross section so that the pin 31 can easily tilt when opening and closing the lid. The head of the pin is locked at the stepped portion 15C.

Further, the lower part 15b of the through hole 15 passes through approximately the center of the seat 16 provided on the lower surface of the lid, and its height is made as low as possible so that the pin 31 can rotate.

The lid 6 is a seat protruding from the outer periphery of the lower surface of the lid toward the center, and the through hole 15 passes through the center, and a hemispherical tip is placed at a right and left symmetrical position at an appropriate distance from the hole. A cylindrical projection 17, 17' is vertically protruded.

21 is a receiving frame, which is buried underground when in use.
The upper part 22 of the inner peripheral side surface is formed with a tapered surface whose diameter decreases downward, and the lower inner periphery that follows the tapered surface forms a ring-shaped receiving part 23.

Reference numeral 24 denotes a hinge portion that projects horizontally toward the center of a part of the ring-shaped receiving portion 23, and a hole 25 into which the pin 31 is loosely fitted is bored in the center, and this hole is shown in the cross-sectional view in FIG. As shown, the upper end 25a is slightly larger than the diameter of the pin, and the lower end 25b is expanded in the front and back so that the pin 31 can tilt without any trouble when opening and closing the lid.

26 and 26' are recesses into which the protrusions 17 and 17' of the lid are fitted, and the cross section thereof, as shown in FIG. It consists of a hemispherical portion 26a and a sloped curved surface 26b connected thereto and rising toward the center.

Reference numeral 31 denotes a pin, which has a cylindrical shape, and the head 32 has a nearly spherical shape with a diameter that is equal to or slightly larger than the diameter of the pin body, and is large enough to be easily inserted into the upper part 15a of the through hole.

Therefore, as shown in the assembled cross-sectional view of this manhole cover in FIG. 3, when the pin 31 is closed, the main body of the pin 31 is inserted into the through-hole 15 of the lid and the hole 25 of the receiving frame, and the head 32 is inserted into the stepped portion 15C of the through-hole. It hangs down while being caught in the.

Further, the length of the pin 31 is sufficient as long as it does not come out of the hole 25 of the receiving frame even if the outer peripheral lower end 18 of the lid 11 is lifted up to the upper end 27 of the receiving frame 21 when the lid is opened.

Reference numeral 33 denotes a stopper, which is a plate-shaped piece that is slightly larger than the lower end 25b of the hole in the receiving frame. After the pin body is inserted into the through hole 15 and the hole 25 in the receiving frame, it is inserted into the pin body from below and locked with a bolt or the like. Ru.

Next, to explain the function of this manhole cover, the receiving frame 21
To assemble the lid 11 and the pin 31 with the lid buried underground, the lid 11 is placed on the ground surface so that the seat 16 on the lower surface of the outer periphery faces directly above the hinge portion 23 of the receiving lid.

Then, the pin 31 is inserted into the through hole 15 of the lid 11 with the head 32 facing upward, and then inserted into the hole 25 in the hinge portion of the receiving frame.

After that, the stopper 33 is inserted into the pin body from below and locked, completing the assembly.

Next, to close the lid, the lid 11 is rotated horizontally around the pin 31 to a position where the entire lower end of its outer circumference faces the upper end of the receiving frame 21.

Next, lower the pin 31 side and insert the tips of the protrusions 17 and 17' of the lid into the sloped curved surfaces 26 b and 26 of the recess of the hinge part of the receiving frame.
b'.

After that, by pushing down the opposite side of the lid and moving it forward, the protrusion 17, 17' will open up to the spherical part 26a of the recess.
26'a, the tapered surface of the outer circumferential side surface 14 of the lid 11 is fitted to the tapered surface of the inner circumferential side surface 22 of the receiving frame, and the sealing of the lid is completed.

To open the lid, if the lid is relatively lightweight, insert a tool into the fishing tag 13, pull it upwards at once, and use the pin 31 as a fulcrum to open the lid by turning it to the right or left. Now, insert a tool into the fishing tags 13 and 13' (you may also use a lever).

) Lift it up so that there is a slight space between the tapered surface of the outer circumferential side surface 14 of the lid and the tapered surface of the inner circumferential side surface 22 of the receiving frame.

Next, lower the pin 31 side and raise the other end so that the protrusion 17.
b, 26'b, and while retracting the other end using the sloped surface as a guide, move the lower outer end 18 of the lid to the upper end 27 of the receiving frame.
lift it up.

Thereafter, the lid 11 is horizontally turned 180 degrees using the pin 31 as a fulcrum, and the opening of the lid is completed.

As a result of the above-mentioned configuration of the present invention, when installing a manhole cover, the assembly is completed by inserting the hinge pin while leaving the cover in a free state even after burying the receiving frame, and when opening the cover, The lid is moved by contact between the spherical protrusion attached to the holder and the recess in the receiving frame, so there is little frictional resistance and the lid can be opened with light force. Since it slides as a guide, it has an excellent effect in that the lid can be accurately and easily placed in a fixed position in the receiving frame.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the manhole cover according to the present invention seen from above in an exploded state, Fig. 2 is a perspective view of the same as seen from below, Fig. 3 is a longitudinal sectional view at the pin insertion position, and Fig. 4 is It is a longitudinal cross-sectional view at a protrusion attachment position. 11 is a lid, 13 is a fishing tag recess, 15 is a through hole, 15a is a reduced diameter portion, 15 C is a stepped portion, 17 is a protrusion, 21 is a receiving frame, 2
4 is a hinge part, 26 is a recess provided in the hinge part, 26 a
is a concave spherical surface, 26b is a sloped surface, 31 is a pin, 32 is a head of the pin, and 33 is a stopper.

Claims (1)

[Scope of utility model registration request] A through hole 15 having a reduced diameter portion 15b at the lower end is bored at a position close to the outer circumference on the center line of the fishing tag recess 13 on the upper surface, and a hemispherical tip protrusion is formed at an appropriate position close to the through hole 15 on the lower surface. A lid 11 with a protruding hole 17 and a through hole 15
The protrusion 1 passes through the hole 25, which is enlarged downward, in a position concentric with the protrusion 1.
a receiving frame 21 having a hinge portion 24 protruding from the lower end of the inner surface thereof, which is provided with a recess 26 consisting of a concave spherical surface 26 a with which the spherical tip of the cylindrical portion 7 contacts and a sloped surface 26 b connected to the concave surface 26 b rising toward the center; A manhole cup consisting of a pin 31 with a head 32 locked in the stepped portion 15C of the through hole, a main body inserted through the hole 25 of the hinge portion, and a pin 31 with a stopper 33 attached to the lower end.