JPH0510034Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a hinge structure for connecting a cover body to a receiving frame in a cover for an underground structure such as a manhole so that the cover body can be opened, closed, and horizontally rotated.

[Conventional technology]

Conventionally, as covers for underground structures such as manholes, in order to connect the cover body to the receiving frame so that it can be opened and closed, for example, as described in Publication of Utility Model Publication No. 57-58296, the cover body and the receiving frame are connected. A structure with a metal hinge between the two is generally used.

As shown in FIG. 8, this connection structure between the lid body and the receiving frame using a hinged metal object includes forming an annular engaging portion 52 on the inner periphery of the receiving frame 51 on which the lid body 50 is fitted and placed, and It is arranged so as to be inserted into the engaging portion 52 of the hinge hardware 53 pivotally connected to the lower surface. This hinge hardware 53 has pivot pin portions 54 protruding from both sides at its upper end, and the pivot pins 54 form a pair of pivot paths formed on the lower surface of the lid body 50 from the center of the lid body 50 toward the edge. It is pivotally attached to the lid main body 50 by being located inside the lid 56.

In order to open the lid body 50, as shown by the dashed line in the figure, the lid body 50 must be turned over to an angle of approximately 180 degrees, or one end of the lid body 50 may be slightly lifted, and the hinge Focusing on hardware 53
A 360 degree horizontal rotation method is used.

[Problem that the invention attempts to solve]

By the way, in order to realize the opening of the lid body 50 by this reversal, in order to avoid interference between the hinge hardware 53 and the edge portion of the lid body 50, the edge portion of the lid body 50 where the pivot path 56 is formed is required. It is essential to provide a notch 57 in the.

However, at the edge portion where the notch 50 is provided, the fitting area with the receiving frame 51 becomes small, which may result in poor sealing. Therefore, it is not preferable to apply it to underground structures that require waterproofing, and there is a problem that it lacks versatility.

On the other hand, when the lid main body 50 is opened by horizontal rotation, the hinge hardware 53 is held between the pair of pivot paths 56, so that the hinge hardware 53 itself as well as the lid main body 50 is held between the pair of pivot paths 56. As a result, the protrusion 55 provided at the lower end of the hinge hardware 53 comes into contact with the lower wall surface of the receiving frame 51, making it impossible to smoothly perform the pivoting operation.

The present invention was devised in view of these problems, and it is possible to perform the lid opening operation smoothly and safely by horizontal turning operation, and moreover, without causing seal failure between the lid body and the receiving frame. The purpose is to provide a hinge structure for a lid for an underground structure.

[Means for solving problems]

In order to achieve the above object, the hinge structure of the lid for underground structures of the present invention is such that the lid body and the receiving frame that fits and supports the lid body are connected to the locking hole of the hole seat protruding from the inner periphery of the receiving frame. In the hinge structure of the lid for an underground structure connected by a hinge metal fitting inserted into the lid, a bag-shaped pivot chamber having a pivot opening opening downward is formed on the lower surface of the lid main body, and the hinge The connecting rod portion of the hardware has a polygonal cross section that cannot rotate within the locking hole, and the lower end of the connecting rod portion is provided with a protruding locking portion that engages with the locking hole, and the upper end is provided with a protruding locking portion that engages with the locking hole. A spherical locking portion that locks into the pivot chamber is formed, and a sliding portion with a circular cross section that allows the lid body to rotate at the pivot opening position is provided at the connecting portion between the spherical locking portion and the connecting rod portion. It is characterized by forming a moving part.

[Effect]

In the hinge structure of the cover for underground structures of the present invention, the connecting rod part of the hinge metal member is held in a non-rotatable state in a locking hole protruding from the receiving frame, and a sliding part is further provided at the upper end of the connecting rod part. Since the spherical locking portion formed through the lid body is locked to the lower surface of the lid body, when the lid body is pivoted, the lid body can be easily opened by horizontally pivoting around the hinge hardware.

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.

Fig. 1 is a longitudinal sectional view showing the main parts of the hinge structure according to the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a sectional view taken along the - line in Fig. 1, and Fig. 4. is a perspective view of the hinge.

In the figure, a lid main body 1 and a receiving frame 2 that supports the lid main body 1 are shown.
and are connected by a hinge metal fitting 3 arranged on the lower surface of the lid main body 1. Further, the other end edge of the lid body 1 is provided with a bag-shaped crow hole (not shown) into which a crowbar for opening the lid is inserted.

The lid body 1 is supported by a tapered fit between a tapered portion 4 formed on its outer peripheral surface and a tapered portion 5 formed on the inner peripheral surface of the receiving frame 2. A groove 6 is provided along the entire circumference of the lower part of the tapered portion 5 of the receiving frame 2, and a sealing gasket 7 is installed in this groove 6. This gasket 7 is in close contact with the lower circumferential surface of the tapered portion 4 of the lid 1 to prevent rainwater etc. from entering from the fitting surface.

A pivot chamber 10 for storing and suspending the upper end of the hinge hardware 3 is formed at one location on the lower peripheral edge side of the lid body 1. As shown in FIG. 3, this pivot chamber 10 has a tapered portion 4 on the edge side that is continuous with the insertion opening 12 for the hinge hardware 3 formed in a substantially circular shape on the center side of the lid 1. The pivot opening 11, which is slightly narrower in the direction, is formed in an oval shape.
In addition, the side wall 13 forming the insertion port 12 includes
A pin hole 14 is provided for fixing a pin 15 to prevent the hinge 3 from falling off.

On the other hand, on the inner periphery of the receiving frame 2, an annular hole seat 21 having a locking hole 20 through which the hinge hardware 3 is inserted is provided. This hole seat 21 locks the lower end portion of the hinge hardware 3 when the lid body 1 is opened.

As shown in FIG. 4, the hinge hardware 3 has a curved, arcuate connecting rod portion 30, and a spherical engagement member rotatably housed in the pivot chamber 10 at one end of the connecting rod portion 30. A stop portion 31 is formed. This spherical locking portion 31
is formed at the tip of the upper sliding portion 33 bent toward the side where the arch-shaped connecting rod portion 30 becomes convex. Further, at the other end of the connecting rod part 30, a T-shaped protruding locking part 32 is formed at the tip of the lower sliding part 34 to abut and engage with the lower surface of the hole seat 21 of the receiving frame 2. has been done.

Further, the connecting rod portion 30 is formed as a rotation preventing portion 35 having a polygonal cross section such as a quadrangle between the upper sliding portion 33 and the lower sliding portion 34 .

This rotation prevention part 35 is such that the hinge hardware 3 is connected to the locking hole 2.
This is to prevent rotation within 0.
As shown in the figure, by making the dimension L of the locking hole 20 of the receiving frame 2 slightly larger than the cross-sectional side length of the rotation prevention part 35, the hinge hardware 3 prevents rotation when the lid body 1 is turned. A diagonal portion of the portion 35 is restrained by the inner wall of the locking hole 20, and its rotation is prevented.

In this hardware hinge 3, the outer diameter of the spherical locking portion 31 is smaller than the inner diameter of the insertion port 12 of the pivot chamber 10 and larger than the opening width of the pivot port 11, and the outer diameter of the spherical locking portion 31 is formed to be larger than the opening width of the pivot port 11. The diameters of the moving parts 33 and 34 are smaller than the opening width of the pivot port 11 and the dimension L of the locking hole 20. Therefore, the lid main body 1 can be horizontally turned smoothly while the pivot opening 11 and the outer circumferential surface of the upper sliding part 33 of the hinge hardware 3 are sliding.

Furthermore, the length of one side of the rotation prevention part 35 is the same as that of the pivot opening 1.
The protrusion-like locking portion 32 is formed to be slightly smaller than the opening width of No. 1 and have a diagonal length larger than this.
The distance between both ends is smaller than the opening length of the locking hole 20 in the radial direction of the receiving frame 2 and larger than the dimension L.

To attach the hardware hinge 3 to the lid body 1, first, the spherical locking portion 31 is inserted through the insertion opening 12 of the pivot chamber 10, and the entire hinge hardware 3 is moved toward the periphery of the lid body 1. At this time, the rotation preventing portion 35 having a rectangular cross section is positioned within the pivot opening 11, and the hinge hardware 3 cannot rotate relative to the lid body 1.

When placing the lid body 1 with the hinge hardware 3 attached on the receiving frame 2, align the protruding direction of the protruding locking portion 32 with the radial direction of the receiving frame 3, and insert the hinge 3 into the locking hole 20 from the lower end. Insert and lower sliding part 34
is located in the locking hole 20, and then open the lid body 1.
When rotated by 90°, the protruding locking portion 32 will engage the hole seat 21.
The lid main body 1 can be connected and locked to the receiving frame 2 by the hinge metal fitting 3.

The operation of opening the lid main body 1 having the above-described hinge structure is performed in the following manner.

First, a crowbar is inserted into a crowbar hole (not shown) and the lid main body 1 is lifted obliquely upward to the position indicated by the dashed line in FIG. At this time, since the rotation prevention part 35 having a square cross section is restrained by the inner wall of the locking hole 20, the hinge hardware 3 moves diagonally upward without being accompanied by rotation around the axis of the connecting rod part 30. do.

As shown in FIG. 6, when the lid body 1 is completely pulled up, the axis of the upper sliding part 33 of the hinge 3 rises, and the upper sliding part 33 is inserted into the pivot opening 11 of the pivot chamber 10. It will be in the position. At this time,
The rotation prevention portion 35 is circumferentially restrained by the inner wall of the locking hole 20 and is held in a non-rotatable state.

As described above, after lifting the lid body 1 above the receiving frame 2 and horizontally rotating the lid body 1 while lifting it around the hinge hardware 3, the opening of the receiving frame 2 is widened. The lid opening operation is completed by completely shifting the lid main body 1 in the direction of the arrow in Fig. 7.

In this way, the lid can be opened easily by rotating the lid body 1 in the horizontal direction, so the worker does not have to step over or cross the manhole opening, and can work safely. can.

Also, when rotating the lid body 1, the hinge hardware 3
and the lid body 1, since only the upper part of the spherical locking part 31 accommodated in the pivot chamber 10 is the abutting part,
The frictional resistance that occurs there becomes small. Therefore, only a small operating force is required to pivot the lid body 1 around the hinge metal fitting 3, and even if the lid body 1 has a large weight, the lid can be opened easily.

Furthermore, since the lid can be opened smoothly by horizontal rotation of the lid body 1, there is no need for a notch to avoid interference between the hinge hardware 3 and the lid body 1 when opening the lid, unlike in the case of the inversion method. . Therefore, the entire circumference of the tapered portion 4 including the attachment portion of the hinge metal fitting 3 is brought into a closed lid state in close contact with the gasket 7. Therefore, sealing can be performed reliably under taper fitting between the tapered parts 4 and 5 of the lid body 1 and the receiving frame 2, and it can also be used in underground structures that require waterproofing.

In the above embodiments, the connecting rod portion 30 of the metal hinge 3 has a curved shape, but the shape is not limited to this, and it can also have a straight shape. In this case, if the radial length of the locking hole 20 of the receiving frame 2 is increased and the required amount of horizontal stroke of the lid body 1 is secured so as not to hinder the lid opening operation, the same procedure as described above can be used. Can be opened. Furthermore, it goes without saying that the present invention can be applied not only to round lids but also to rectangular large iron lids.

[Effect of idea]

As explained above, in the hinge structure of the lid for underground structures according to the present invention, a spherical locking portion that is locked in the pivot chamber is formed at the upper end of the connecting rod, and a spherical locking portion and A sliding portion with a circular cross section that allows the lid body to rotate at the pivot opening position is formed in the connecting portion of the connecting rod portion. Therefore, when opening the lid, the lid can be easily opened by rotating horizontally around the sliding part of the hinge, allowing the worker to step over the manhole opening and turn the lid over. The work can be done more safely than if the Furthermore, since there is no need to provide a notch in the tapered portion of the pivot chamber portion of the lid body, the seal with the receiving frame can be maintained, and it can be widely used in underground structures that require waterproofing.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing the main parts of the hinge structure according to the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a view taken along the - line in Fig. 4, and Fig. 4. is a perspective view of the hinge, FIG. 5 is a cross-sectional view showing the locking hole of the receiving frame, FIG. 6 is a cross-sectional view showing the displacement of the hinge when the lid is in a position where it can be rotated, and FIG. FIG. 8 is a cross-sectional view of the conventional hinge structure when completed. 1... Lid body, 2... Receiving frame, 3... Hinge hardware,
4, 5... Taper part, 6... Groove, 7... Packing, 10... Pivot chamber, 11... Pivot opening, 12...
Mounting port, 13... side wall, 14... pin hole, 15...
... Pin, 20 ... Locking hole, 21 ... Hole seat, 30 ...
...Connecting rod part, 31... Spherical locking part, 32... Protruding locking part, 33... Upper sliding part (sliding part), 34
...lower sliding part, 35...rotation prevention part.

Claims (1)

[Scope of utility model registration request] In the hinge structure of the lid for an underground structure, the lid main body and the receiving frame fitting and supporting the lid main body are connected by a hinge metal fitting inserted into a locking hole of a hole seat protruding from the inner periphery of the receiving frame. A bag-shaped pivot chamber having a pivot opening opening downward is formed on the lower surface of the lid body, and the connecting rod of the hinge has a polygonal cross section that cannot rotate within the locking hole. , a protruding locking portion that engages with the locking hole is provided at the lower end of the connecting rod portion;
A spherical locking portion that locks into the pivot chamber is formed at the upper end, and a circular portion that connects the spherical locking portion and the connecting rod portion allows the lid body to rotate at the pivot opening position. A hinge structure for a lid for an underground structure characterized by forming a sliding section in cross section.