JP2001049682A - Iron lid for underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an iron lid with a hinge for an underground structure in which a pin having a pin hinge structure of the iron lid for an underground structure made of cast iron is integrally constituted of the lid body of the iron lid and the housing part for the pin is formed in the corresponding receive frame side and the assembling work can be securely carried out in a specified procedure although it becomes complicated and it is not easily separated. SOLUTION: A pin projects to the rear side of the lid, at mutually symmetric one end of both the corresponding side faces of the lid body 1, and the outer end face is shaped to form an arc-shaped cam 3. An integrally formed pin 4 projecting at right angles in a portion near to the lid surface side of the cam face is implanted. An oval groove 5 in which the pin 4 of a central pitch positioned at a little upper part than the central pitch from the lid surface of the pin 4, in the inside face corresponding to the pin 4 is fitted loose is constituted in the receive frame 2 housing the lid body 1. An assistant part 7 is provided at the lower part so that the pin sinks in the opened condition of the lid in the position where the pin 4 of the oval groove 5 is usually located.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron cover for an underground structure in which an iron cover is opened and closed by a bin hinge for monitoring and operating the underground structure from the ground.

[0002]

2. Description of the Related Art Conventionally, in a pin hinge structure of an iron cover for an underground structure with a pin hinge, a main body and a pin are separate structures.
There is a structure in which the lid is required to be easily attached and detached, and is integrated with the structure.

[0003]

SUMMARY OF THE INVENTION A pin of a pin hinge structure of an iron lid for an underground structure made of cast iron is integrally formed with an iron lid lid, and a storage portion for the pin is provided in a corresponding receiving frame side portion, and assembling is performed. The technical problem to be solved is to provide an iron lid for an underground structure with a pin hinge that can be reliably executed if the operation is performed in a certain procedure, but is not easily separated later.

[0004]

Technical means for solving the above-mentioned problems are as follows. In a rectangular iron cover, corresponding ones of both side surfaces of the cover body are respectively symmetrically protruded to the rear side of the cover,
The outer end surface of the cam surface forms an arc cam, and an integral pin projecting at a right angle is implanted at a portion of the cam surface that is close to the front side of the lid,
The structure of the receiving frame for storing the lid, on the inner surface corresponding to the pin, forms a long groove for loosely fitting the pin at a center pitch slightly higher than the center pitch from the lid surface of the pin,
At the part where the pin is always present in the long groove, a gouge is formed downward so that the pin sinks in the open state.

[0005]

The operation of the present invention will be described. The receiving frame is placed in a horizontal state, the lid is erected upright with the pin mounting portion down, and the cover is placed obliquely with respect to the receiving frame. On the other hand, if the length of both ends of the lid pin is short as the hypotenuse to the short side of the right triangle, the lid pin is in contact with the long groove and can be fitted, and in this state, the parallel state When the pin is turned, the pin is finally settled on the lower support part by the cam in the state of being fitted into the long groove part, and the assembly state is established. The deviation is that the lid itself is large in weight, and the cam portion projecting below the lid constituted by the pin portion restrains the horizontal movement of the lid and maintains the lid in a stable state.

[0006]

An embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, 1 is a lid, 2 is a receiving frame, 3 is a cam having an outer end surface protruding behind the lid of the lid 1 and having an arcuate shape, and 4 is a cam surface of the arcuate cam 3 which is closer to the front side of the lid. An integral pin 5 projecting at a right angle at a portion thereof has a center pitch slightly above the center pitch from the cover surface of the pin 4 on the inner surface 6 corresponding to the pin 4 of the receiving frame 2. The long groove to be fitted, 7 is the long groove 5
In the part where the pin 4 is always present, the pin 4 is formed so as to sink down when the lid is opened. FIG. 2 illustrates an embodiment in which the lid 1 is assembled to the receiving frame 2. The lid 1 is inserted vertically in an upright state in accordance with the portions a and b of the long groove 5 of the receiving frame 2, and is turned in the direction of arrow c. After the assembly, since the center pitch of the pins 4 from the lid surface is lower than the center pitch of the long grooves 5,
To prevent the lid 1 from getting out.

[0007]

As described above, according to the present invention, in the pin hinge structure of the iron cover for an underground structure, the required pins are not separately prepared, and the processing for mounting the pins is not necessary, and The attachment operation can be performed easily and reliably if performed in a certain procedure, and there is an effect that it is not easily separated after the assembly.

[Brief description of the drawings]

FIG. 1 is a partially sectional perspective view showing an open state of an iron cover for an underground structure embodying the present invention.

FIG. 2 is a perspective view showing a part of FIG. 1;

FIG. 3 is a top view showing an operation mode.

[Explanation of symbols]

 1, lid 5, long groove 2, receiving frame 6, inner surface 3, arcuate cam 7, gouge 4, pin

Claims (1)

[Claims] 1. An iron cover made of cast iron or the like and having a square shape, a configuration in which opposite side surfaces of the lid body are respectively symmetrically protruded to the back side of the lid, and an outer end surface thereof forms an arc cam. An integral pin protruding at a right angle is implanted at a portion of the cam surface that is close to the front side of the lid, and the structure of the receiving frame for storing the lid is such that the pin is formed on the inner surface corresponding to the pin. Construct a long groove for loosely fitting the pin with a center pitch slightly above the center pitch from the lid surface, and at a position where the pin of the long groove is always present, the pin is lowered so that the pin sinks in the open state. An iron lid for an underground structure comprising a sandwich.