JPH0726428Y2 - Opening / closing structure of lid for underground structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an opening / closing structure for a lid for an underground structure that can be stably kept open at a set angle.

(Prior Art) In the present application, a lid for an underground structure means water, sewer, gas,
This is a general term for the lid for connecting to the aboveground or above the floor of the underground or underfloor storage space such as underground buried objects such as electricity, underground structure facilities, underground installations such as instruments. This type of large lid has a structure in which the lid and the receiving frame are usually locked by a hinge metal fitting, and the hinge metal fitting is used as a center of rotation to invert the lid and open the lid. There are two types, one that flips the lid 180 degrees and one that puts the lid upright at a predetermined angle. However, this seed cover is often installed in places such as roads, plazas, etc. where people and vehicles pass, and it is not possible to confirm that the lid is opened 180 degrees and the lid is opened from a distance during work. There is a problem that a vehicle or the like of the vehicle may fall into the opening, and the lid is heavy when the lid is closed, and a considerable force is required to lift the lid. The one that keeps the lid upright at a predetermined angle can be confirmed from a distance even during the lid opening work, and it does not require much force to lift the lid compared to the one that flips 180 degrees when closing the lid. When the lid is opened, the lid is supported only by the pivot point of the hinge fitting and the contact point between the upper edge of the inner surface of the receiving frame and the surface of the lid, and the two points are close to each other. The load on the points is too large and unstable, and the hinge fittings may be damaged or the lid may fall over resulting in an unexpected accident due to vibrations and slight shocks caused by the passage of people or vehicles. is there.

It is an object of the present invention to provide a structure for stably maintaining the lid in the opened state with a predetermined inclination when opening the lid.

(Means for Solving Problems) In an opening / closing structure for a lid for an underground structure in which the lid is opened and maintained in an inclined state, a support rod having a hole having an opening at the tip is housed on the back side of the lid, and A protrusion that fits into the hole at the tip of the support rod is provided on the upper surface of the protrusion that projects on the inner wall surface of the receiving frame, the lid is opened, and the protrusion is fitted into the hole at the tip of the support rod so that the support rod becomes the protrusion. It is possible to stand and fix it on the upper surface of and to support the lid in an inclined state.

As another means, instead of providing a hole at the tip of the support rod, the tip part is made into a plurality of branch supports, and a protrusion protruding on the upper surface of the protrusion protruding on the inner wall surface of the receiving frame can be fitted between the branch supports. And

(Operation) The projection on the upper surface of the protruding portion provided on the inner wall surface of the receiving frame is fitted into the hole at the tip of the supporting rod or the branch support to fix the supporting rod to the receiving frame.
The support rod supports the lid that is opened in an inclined state.

(Example) What is shown in the drawings is an example in a manhole.

In the drawing, 1 is a receiving frame, 2 is a lid, and 3 is a supporting rod.

The receiving frame 1 has a hole in the inner wall surface through which the hinge 4 can be inserted, and a shelf 5 that supports the lower peripheral portion of the lid 2 and a protrusion that supports the tip of the support rod 3 when the lid 2 is opened. 6 has a protrusion 6
The upper surface of is further provided with a protrusion 6a.

FIG. 3 is a perspective view of the protrusion 6. The projection 6 in this embodiment is composed of two hinge fittings 4 projecting from the inner wall surface of the receiving frame 1.
It is integrally formed in the middle of the receiving portion 4a while being connected by the connecting portion 6b. It is possible to provide the protrusion 6 and the receiving portion 4a independently without connecting them, but when they are connected,
Each is reinforced and preferred. If the holes 6c and 6c are provided between the projecting portion 6 and the receiving portion 4a, the connecting portion 6b can be gripped by the hand, which is convenient for work.

The support rod 2 has an expanding portion 8 bent at a predetermined angle with respect to the rod body 7 at one end of the rod body 7, and the expanding portion 8 is provided with a hole 9 having an opening at the end surface. The vicinity of the other end of the rod 7 is slightly bent in the direction opposite to the expanding portion 8,
A cutout 10 is provided at the end thereof. A screw hole may be provided instead of the notch 10.

A known locking mechanism for the hinge fitting 4 is provided on the peripheral portion of the lid 2,
On the back surface, a projection 22 having a notch 21 into which a portion having the notch 10 at the end of the rod body 7 of the support rod 3 can be fitted is provided. Instead of the notch 21, a hole through which the end of the rod 7 can be inserted may be provided. Further, the ribs 23 on the back surface are provided with holes 24 or notches. The protrusion 22 is provided with a screw hole 25, the notches 10 and 25 are opposed to each other, and the notch 21 is pushed by the tip of the screw 26 so that the rod body 7 can be locked to the protrusion 22.

FIG. 1 shows a state in which the support rod 3 is held by the lid 2 when the lid is closed. The end portion of the support rod 3 is fitted into the notch 21 of the protrusion 22.
The rod 7 is inserted into the hole 24 of the rib 23, the notch 10 and the screw hole 25 are opposed to each other, and the screw 26 is screwed in to fix the rod 7. At this time, the rib 23 supports the rod 7 at the edge of the hole 24. Stick 7
Since the end of is bent in the direction opposite to the expanded head 8,
When the end of the rod 7 is fixed at 26, the end surely contacts the back surface and becomes stable. The end portion of the rod body 7 may not be bent.

FIG. 2 shows a usage state of the support rod 3 when the lid is opened.

In a tilted state in which the lid 2 is rotated around the hinge metal fitting 4 as an axis and the surface of the lid 2 is in contact with the upper end of the inner surface of the receiving frame 1, the screw 26 is removed and the support rod 3 is slid down to make the protrusion 6 of the receiving frame 1 Protrusion
6a is fitted into the hole 9 of the expanded head 8 of the support rod 3. If branch ends are provided at the tips of the support rods, the protrusions
Fit 6a. In this state, the lid 2 is the hinge fitting 4
The protrusion 6a of the projecting portion 6 of the receiving frame 1 is fitted into the hole 9 of the expanding head 8 of the supporting rod 3 as well as two points of contact between the rotation axis of the lid 2 and the upper end of the inner surface of the receiving frame 1 with the surface of the lid 2. The support bar 3 of the fixed support rod 3 supports the ribs 23 of the lid 2, and the lower end corner (corner) A of the edge of the lid 2 abuts the bar body 7 so that the lid 2 Even if the lid 2 is prevented from reversing beyond the angle of the tilted state, and even if the lid 2 tries to rotate in the closing direction, the back surface of the lid 2 comes into contact with the fixed support rod 3 to prevent the lid 2 from rotating. .

A method may be considered in which a hole is provided in the protrusion 6 instead of the protrusion 6a and the tip of the support rod is inserted into the hole to fix the support rod to the receiving frame. However, when the protrusion 6a is provided, the strength of the receiving portion 6 is increased. Well again
Therefore, the width of the projection 6 can be made relatively narrow, the distance between the projection 6 and the receiving portion 4a can be widened, and the distance between the tip of the projection 6 and the receiving frame can be shortened, which is preferable.

If the protrusion 11 is provided in the vicinity of the end of the rod body 7, even if the lid is opened and the expanded head 8 of the support rod 2 and the protrusion 6a are erroneously engaged, the protrusion 11 is blocked by the rib 23 and the support rod 3 Can be prevented from falling into the manhole. It is preferable that the protrusion 11 can be detachably attached by a method such as screwing.

The cross-sectional shape of the rod 7 may be any shape such as a round shape or a square shape.

When the rod 7 is thick, the expanding head 8 may be bent at the end of the rod 7 without forming the expanding shape, and the hole 9 may be provided at the tip thereof. Further, two or more branch supports may be provided instead of the expanded head 8.

(Effect) According to the lid opening / closing structure according to the present invention, the support rod supported by the protrusion on the inner surface of the receiving frame stably maintains the lid open state at a predetermined angle and prevents the lid from rotating. Therefore, the lid is prevented from being rotated and further inverted or closed due to vibration or some shock caused by a passing person or a car.

Further, when the lid is closed, the support rod can be held on the back surface of the lid, so that the support rod does not get lost and does not become confused when necessary.

[Brief description of drawings]

What is shown in the drawings is an embodiment of a manhole according to the present invention, and FIG.
FIG. 3 is a cross-sectional view of a main part in an opened state, and FIG. 3 is a perspective view of a protrusion of a receiving frame. 1 ... Receiving frame 2 ... Lid 3 ... Support rod 4 ... Hinge metal fitting 5 ... Shelf 6 ... Projection 6a ... Projection 7 ... Rod 8 ... Expanding head 9 ... Hole 10 ... Cutting Notch 11 …… Protrusion 21 …… Notch 22 …… Projection 23 …… Rib 24 …… Hole 25 …… Butterfly hole

Claims (2)

[Scope of utility model registration request] 1. In an opening / closing structure for a lid for an underground structure, in which the lid is opened and maintained in an inclined state, a support rod having a hole having an opening at the tip is housed on the back side of the lid, and the tip of the support rod is Protrusions that fit into the holes are provided on the upper surface of the protrusions protruding from the inner wall surface of the receiving frame, the lid is opened and the protrusions are fitted into the holes at the tips of the support rods, and the support rods are erected on the upper surface of the protrusions. An opening / closing structure for a lid for an underground structure, which is fixed and is capable of supporting the lid in an inclined state. 2. The tip of the support rod is divided into a plurality of branch supports,
The opening / closing structure for a lid for an underground structure according to claim 1, wherein a protrusion on an upper surface of a protrusion provided on an inner wall surface of the receiving frame can be fitted between the branch supports.