JPS6032218Y2 - Fixed structure of iron lids for underground structures - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fixing structure for an iron cover of an underground structure.

The purpose of the present invention is to provide an iron cover for underground structures that has a structure in which the cover does not accidentally pop out and is always housed horizontally within the receiving frame.

Therefore, the present invention has a substantially U-shaped recess that engages with a flat projection 5 provided on the receiving frame 4 on the surface of the hinge fitting 3 screwed onto the lid 1 with a pin 2, which is provided on the receiving frame 4. A retaining ring 7 that surrounds the hinge metal fitting 3, in which the notch 6 is formed in an oblong shape corresponding to the shape of the protrusion 5 and has a heavy lower end, is made to protrude inside the receiving frame 4, and furthermore, the retaining ring 7 has a thickness a that is approximately The gist of this invention is to provide a fixing structure for an iron cover for an underground structure in which the opening size of the letter-shaped recess 6 is reduced.

In the figure, 8 indicates a retaining protrusion of the hinge metal fitting 3.

In the illustrated embodiment, the protrusion 5 is flat, and the substantially U-shaped recess 6 is also a horizontally elongated recess similar to the protrusion 5, so that the lid 1 is even more inclined forward and backward and left and right with respect to the pin 2. can be prevented.

In addition, as a result of making the opening in the height direction of the approximately U-shaped recess 6 smaller than the thickness a of the retaining ring 7, the recess 6 engages only with the protrusion 5, and it may accidentally engage with the retaining ring 7. There is no.

The receiving frame 4 has a fitting edge 4' inclined back and forth by 8 degrees so as to fit the circumferential edge of the lid 1.

The present invention has the structure explained above, and when the lid 1 is closed,
Since the hinge fitting 3 tries to become vertical due to its own weight, the substantially U-shaped recess 6 inevitably engages with the protrusion 5 of the receiving frame 4 and becomes stable, and the lid 1
stop the vertical movement of.

In addition, when opening the lid 1, if the lid 1 is moved in the direction of the arrow in FIG. It can be opened by turning around 3.

Therefore, when the lid is closed, the substantially U-shaped recess 6 definitely fits into the protrusion 5 of the receiving frame 4 to prevent the lid 1 from popping out, and also prevents the lid 1 from tilting forward, backward, left, or right when it is housed in the receiving frame 4. This has the advantage that there is no fear that the lid 1, which has a tapered peripheral edge, will dig into the receiving frame 4 too much.

In particular, according to the present invention, since the concave notch 6 is approximately U-shaped, when the lid is closed, the concave notch 6 is securely locked and fitted into the protrusion 5, so that it will not come off due to vibration etc. when the lid is closed. Since the notches 6 are both horizontally long, it is possible to prevent the engaging inner lid 1 from tilting, and the concave notches 6
Since it does not engage with anything other than the protrusion 5, when the lid 1 is turned, it will not accidentally engage with the retaining ring 7, and the retaining ring 7 restricts the movement of the hinge fitting 3, so that when the lid 1 is closed, The U-shaped recess 6 reliably fits into the protrusion 5.

[Brief explanation of the drawing]

The drawings show the fixing structure of the manhole iron cover according to the present invention; FIG. 1 is a longitudinal side view, FIG. 2 is a partial plan view, and FIG. 3 is a perspective view of the hinge fitting. 1...Lid, 2...Zen, 3...
Hinge metal fittings, 4... Receiving frame, 5... Protrusion,
6... Roughly U-shaped recessed cutout, 7... Retention ring,
a: Thickness of the retaining ring 7, b: Opening size of the substantially U-shaped recess 6.

Claims (1)

[Scope of utility model registration request] A substantially U-shaped recess 6 is provided on the surface of the hinge fitting 3 screwed onto the lid 1 with a pin 2, facing the receiving frame 4, and the flat projection 5 provided on the receiving frame 4 is provided with a substantially U-shaped recess 6 that engages with the closing lid special electric wire. A retaining ring 7 that surrounds the hinge metal fitting 3, which has an oblong shape corresponding to the shape and has a heavy lower end, protrudes inside the receiving plate 4, and furthermore, the retaining ring 7 has a substantially U-shaped concave notch with a thickness a. Fixed structure for iron lids for underground structures with a small opening size.