JP2000220162A - Coupling device of iron lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the coupling device of an iron lid enabling man-hours to be extremely saved during the swing operation of the iron lid. SOLUTION: While forming a spherical surface receiving groove 12 is formed at the peripheral lower surface of an iron lid 2, a spherical head part 7c is provided at the upper end thereof, and a lever 7 having the spherical head part 7c rotatably fitted in the spherical surface receiving groove 12 is swayably pivoted at a support part projected to the inner periphery of a lid receiving frame 1, so that the iron lid 2 is supported at the raised position in a manner permitting it to float from the lid receiving frame 1. This allows the iron lid 2 to turn about the spherical head part 7c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for an iron cover for shielding openings such as manholes and inspection ports.

[0002]

2. Description of the Related Art An iron cover for covering an opening such as a manhole or an inspection port is attached to a cover receiving frame provided on an inner periphery of the opening. The iron cover is used to prevent the iron cover from being lost due to mischief or theft. There is a device provided with a connecting device for connecting the iron cover to a cover receiving frame. As shown in FIG. 11A, the conventional coupling device suspends a substantially S-shaped lock lever c via a support shaft b on a lower surface of a peripheral edge of an iron lid a, and a locking portion on an inner peripheral edge of a lid receiving frame d. e, and the lock lever c is inserted through a radially elongated hole f formed in the locking portion e. Of the iron cover a is connected to the cover receiving frame d.

The lock lever c has a projection k facing downward from a locking surface h of a locking portion e in a hanging state due to its own weight. Even if the vicinity of the position immediately above is raised, the projection k abuts on the locking surface h to prevent the opening by an operation other than the normal opening operation.

[0004] Then, by the regular opening procedure of the iron cover a,
As shown in FIG. 11B, when the iron cover a is removed from the cover receiving frame d, the locking lever g of the lock lever c comes into contact with the lower surface of the locking portion e to change the connection state with the cover receiving frame d. It is supposed to be maintained.

[0005]

In the conventional connecting device as described above, in order to open the iron cover a, first, an operation formed on the peripheral edge of the iron cover a on the opposite side of the connecting device. A special bar is inserted into the mouth, the tip of the bar is engaged with a concave portion formed on the lower surface of the rim of the operation port, one end of the iron cover a is lifted, and then the iron cover a is pulled outward as shown in FIG. As shown in (b), the lock lever c is pulled upward until the retaining rod g comes into contact with the lower surface of the locking portion e. As a result, the iron cover a is turned. Then, with the one end of the iron cover a raised, the iron cover a is set so that the lock lever c does not return.
The iron cover a is opened by turning about 180 ° while pulling outward. Further, even when the iron cover a is closed, the iron cover a is pivoted while pulling outward so that the lock lever c does not return. During the turning operation of a, the iron cover a must be pulled outward to keep the lock lever c in a state of being always pulled upward, and the end of the iron cover a on the connecting device side is connected to the surrounding ground. There is a problem that a large amount of labor is required to open and close the iron cover a, especially in the case of a rectangular or large-diameter iron cover a, since the sliding resistance is caused by being dragged upward.

[0006] Further, in the conventional connecting device, FIG.
As shown in (a), since the lower portion of the lock lever c protrudes from below the lid receiving frame d, when the product is placed on the floor during transportation or storage of the product before construction, the iron cover a is pushed up by the lock lever c, and It tilts in a state where it comes off the receiving frame d. For this reason, there is a problem that it is difficult to stack products and the handling is poor.

An object of the present invention is to provide a connecting device for an iron lid which can solve such a conventional problem.

[0008]

According to the present invention, a spherical receiving groove is formed on a lower surface of a peripheral edge of an iron cover attached to a lid receiving frame, while a spherical head is provided at an upper end, and the spherical head is attached to the spherical receiving groove. A lever rod rotatably fitted into the groove is pivotally connected to a support part protruding from the inner peripheral edge of the lid receiving frame so that the iron lid can be lifted up from the lid receiving frame at the standing position and supported. A connecting device for an iron lid.

In such a configuration, the iron cover is supported in a state of being lifted from the cover receiving frame by pulling the iron cover in the upright rotation direction of the lever bar and raising the lever bar. As a result, the weight of the iron lid on the connecting device side is supported by the spherical head of the lever rod, and the iron lid can be easily turned around the spherical head.

[0010] Further, since the lever rod can be turned upside down and settled in the lid receiving frame in a sideways state, the products can be stacked and the handling is excellent.

In the above construction, there is provided a rotation regulating means for positioning the lever rod at a self-standing position beyond the rotation dead center, so that the iron cover is lifted from the lid receiving frame and supported at the self-standing position. It may be. In this way, by making the lever rod self-supporting by the rotation regulating means, a force for holding the lever rod in an upright state is not required, and the iron lid need only be turned around the spherical head, so that it can be opened and closed. The labor at the time of work can be greatly reduced. As the rotation restricting means, a rotation restricting edge is formed on the support portion for abutting against the lever rod at a rotational position above the rotational dead center of the lever rod to regulate the rotation. A configuration in which the lever rod is self-supported by the rotation regulation of the lever rod according to the above can be proposed as a preferred embodiment.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.
Will be described. In the drawings, reference numeral 1 denotes a lid receiving frame provided on the inner periphery of an opening such as a manhole or an inspection port, and an iron lid 2 is attached to the lid receiving frame 1. The iron lid 2 is formed in a rectangular shape that presents a rectangle in plan view.
Also has a rectangular frame shape substantially equal to the outer peripheral shape of the iron lid 2.
At a substantially middle position of the inner peripheral edge which forms one side of the lid receiving frame 1, a support portion 3 constituting the connecting device A according to the present invention is formed to project inward. As shown in FIGS. 3 and 4, the bearing portion 3 includes a pair of left and right bearing walls 5, 5 each having a bearing hole 4 at the tip, and a horizontal shape extending between the bearing walls 5, 5. The connecting wall 6 has a rotation defining edge 8 formed at the inner front end of the connecting wall 6 for rotating a lever rod 7 described later.

As shown in FIGS. 5 and 6, the lever rod 7 is a spherical head coupled to a main rod part 7a having a predetermined length and an upper end of the main rod part 7a via a small-diameter neck part 7b. The insertion hole 9 is formed below the main rod 7a. By fitting both ends of the support shaft 10 loosely fitted into the insertion hole 9 to the bearing holes 4, 4 of the bearing walls 5, 5, the lever rod 7 can be turned upside down with respect to the support portion 3. To be connected to A locking projection 11 is formed at the lower end of the main rod portion 7a. The locking projection 11 comes into contact with the rotation defining edge 8 of the support portion 3 at the upright position of the lever rod 7. I have. The locking projection 11 and the rotation defining edge 8 constitute a rotation defining means for defining the amount of rotation of the lever rod 7. Further, as shown in FIG.
The upright position is set by the rotation regulating means so that the spherical head 7c pivots upward to a position beyond the pivot dead center on the vertical extension line of the support shaft 10, whereby the center of gravity of the lever rod 7 is set. The lever is deflected inward so that the lever 7 is self-supporting.

On the other hand, on the lower surface of the periphery of the iron cover 2 attached to the cover receiving frame 1, a spherical receiving groove 1 is provided at a position corresponding to the lever rod 7.
2 are formed. As shown in FIGS. 7 and 8, the spherical receiving groove 12 is formed by connecting left and right side walls 2c, 2c and a bottom wall 2d to corner portions of a top wall 2a and an outer peripheral wall 2b constituting the iron cover 2. The bag-shaped housing 13 is provided inside, and a fitting opening 14 is opened on the inner end side of the bag-shaped housing 13, and the neck 7 b of the lever 7 is inserted into the bottom wall 2 d. An insertion passage 15 is opened so as to communicate with the fitting opening 14. At the position of the spherical receiving groove 12 near the fitting opening 14, retaining step edges 16a and 16b are formed at upper and lower positions, respectively.

The spherical head 7c of the lever rod 7 is fitted through the fitting opening 14 so as to be rotatably fitted into the spherical receiving groove 12. In this fitting state, the spherical head 7c is provided with a retaining step edge 16a,
Detachment from the spherical receiving groove 12 is regulated by 16 b, and it is held in the spherical receiving groove 12. Further, the lever rod 7 in which the spherical head 7c is fitted in the spherical receiving groove 12 can lift and support the iron cover 2 from the lid receiving frame 1 in the upright state. Is set to a length that allows the spherical head 7c to fall down while maintaining the fitted state with the spherical receiving groove 12 when the cover is attached to the lid receiving frame 1. Thereby, the iron lid 2
Is connected to the lid receiving frame 1. As shown in FIG. 9, an operation port 17 is opened on the periphery of the iron cover 2 on the opposite side of the connecting device A.
A concave portion 1 with which the tip of the special bar x can be engaged.
8 are formed.

In such a structure, when the iron cover 2 attached to the cover receiving frame 1 is opened, as shown in FIG.
A special bar x having an L-shaped hook at the tip is inserted into the operation port 17 of the iron cover 2, and the hook at the tip is inserted into the recess 1 of the operation port 17.
8, one end of the iron cover 2 is lifted, and the iron cover 2 is detached from the lid receiving frame 1 by pulling the iron cover 2 outward on the side opposite to the connecting device A as it is. Here, when the iron lid 2 is pulled outward in this manner, the lever rod 7 in which the spherical head 7c is fitted into the spherical receiving groove 12 of the iron lid 2 is moved from the sideways state shown in FIG. It is gradually raised and pivots upward. When the lever 7 is rotated upward to a standing position beyond the pivot dead center, as shown in FIG.
When the center of gravity of the lever 7 is deflected inward in this state, the lever 7 is self-standing. Then, the iron lid 2 is supported by the self-standing lever rod 7 in a state of being levitated from the lid receiving frame 1, and the iron lid 2 is turned.

Then, one end of the iron cover 2 is lifted by the special bar x engaged with the concave portion 18 of the operation port 17, and the iron cover 2 is turned by approximately 180 ° about the spherical head 7c, thereby turning the iron cover 2 around. The lid 2 can be opened. However, at this time, since the weight of the other end of the iron cover 2 is supported by the lever rod 7, the turning operation of the iron cover 2 can be easily performed. Further, since the lever 7 is self-supporting, a force for holding the lever 7 in an upright state is unnecessary, so that the labor can be greatly reduced.

When the opened iron lid 2 is to be closed again, the iron lid 2 is moved about 18 degrees in the opposite direction around the spherical head 7c.
After turning by 0 °, when the iron cover 2 is pressed toward the connecting device A, the lever rod 7 rotates in the sideways direction along with the pressing operation, and the cover 2 is covered with the iron cover 2. You can wear it. Even in this case, the turning operation of the iron cover 2 can be easily performed because the weight of the other end side of the iron cover 2 is supported by the lever rod 7 as in the case of opening. Since the stand 7 is self-standing, there is no need for a force for holding the lever 7 in an upright state.

In the above embodiment, the locking projection 11 protruding from the lower end of the main rod 7a of the lever rod 7 and the support 3
And a rotation defining edge 8 formed at the inner front end of the connecting wall 6 of the first embodiment, constitutes a rotation defining means for the lever 7. The rotation defining means controls the amount of rotation of the lever 7. It is sufficient that the lever 7 can be positioned at a self-standing position beyond the rotational dead center. FIG. 10 shows an example thereof,
This is provided so that a rotation defining edge 8 ′ is provided across the inner front ends of the bearing walls 5, 5 of the support portion 3, and the lever 7 is attached to the rotation defining edge 8 ′.
The main rod portion 7a is brought into contact. Even with such a configuration, it is possible to position the lever rod 7 at a self-standing position beyond the rotational dead center.

In the above embodiment, the iron cover formed in a rectangular shape has been described. However, the connecting device A according to the present invention can be applied to a circular iron cover.

[0021]

According to the present invention, as described above, a spherical receiving groove is formed on the lower surface of the peripheral edge of the iron lid attached to the lid receiving frame, while a spherical head is provided at the upper end, and the spherical head is attached to the spherical surface. A lever rod rotatably fitted in the receiving groove is pivotally connected to a support part protruding from the inner peripheral edge of the lid receiving frame so that the iron lid can be lifted from the lid receiving frame at the standing position. Since the support is supported, the iron lid is pulled in the upright rotation direction of the lever rod, and the lever rod is raised, so that the iron lid can be supported in a state of floating above the lid receiving frame. As a result, the weight of the iron lid on the connecting device side is supported by the spherical head of the lever rod, and the iron lid can be easily turned around the spherical head.

Further, since the lever rod can be turned upside down and settled in the lid receiving frame in a sideways state, it is possible to stack products during storage or transportation, and thus to have excellent handleability.

In the above construction, there is provided rotation defining means for positioning the lever rod at a self-standing position beyond the rotation dead center, and the iron cover is lifted from the lid receiving frame and supported at the self-standing position. With this configuration, there is no need to hold the lever rod in the upright position, and the iron lid only needs to be pivoted about the spherical head. There are excellent effects such as reduction.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an iron lid connecting device according to the present invention in a construction state in which the iron lid is attached to a lid receiving frame.

FIG. 2 is a side sectional view showing an operation state of the connecting device of the above.

FIG. 3 is a side sectional view showing a configuration of a support portion formed on a lid receiving frame.

FIG. 4 is a plan view showing a configuration of a bearing unit according to the embodiment.

FIG. 5 is a side view of a lever rod.

FIG. 6 is a front view of a lever rod.

FIG. 7 is a side sectional view showing a configuration of a spherical receiving groove formed in an iron cover.

FIG. 8 is a bottom view showing the configuration of the spherical receiving groove in the first embodiment.

FIG. 9 is a side sectional view showing a configuration of an operation port portion formed in the iron cover.

FIG. 10 is a side sectional view showing another configuration of the lever rod rotation regulating means.

FIG. 11A is a side sectional view of a conventional configuration, and FIG. 11B is a side sectional view of an operation state thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS A Connecting device 1 Lid receiving frame 2 Iron lid 3 Bearing 7 Lever rod 7c Spherical head 8 Rotation defining edge (rotation defining means) 11 Locking projection (rotation defining means) 12 Spherical receiving groove

Claims (3)

[Claims] An iron cover attached to a lid receiving frame has a spherical receiving groove formed on a lower surface of a peripheral edge thereof, and a spherical head is provided at an upper end, and the spherical head is rotatably fitted to the spherical receiving groove. An iron cover, which is pivotally connected to a supporting portion protruding from an inner peripheral edge of the lid receiving frame so as to be capable of being turned upside down and floats the iron lid from the lid receiving frame at the upright position to support the iron lever. Coupling device. 2. An iron lid attached to a lid receiving frame, wherein a spherical receiving groove is formed on a lower surface of a peripheral edge, and a spherical head is provided at an upper end, and the spherical head is rotatably fitted to the spherical receiving groove. Rotation restricting means for pivotally connecting the lever rod to a support portion protruding from the inner peripheral edge of the lid receiving frame, and positioning the lever rod at a self-standing position beyond the rotation dead center. Wherein the iron cover is lifted from the lid receiving frame and supported at the self-standing position. 3. An iron lid attached to a lid receiving frame, wherein a spherical receiving groove is formed on a lower surface of a peripheral edge, and a spherical head is provided at an upper end, and the spherical head is rotatably fitted to the spherical receiving groove. The lever rod thus formed is pivotally connected to a supporting portion formed on the inner peripheral edge of the lid receiving frame so that the lever rod can be turned upside down, and contacts the lever rod at an upper rotation position beyond the rotation dead center of the lever rod. A rotation defining edge that contacts and regulates the rotation is formed on the support portion, and the lever rod is independently supported by the rotation regulation of the lever by the rotation defining edge, and the iron cover is lifted from the lid receiving frame at the independent position. An iron lid connecting device characterized by being supported.