JP3706426B2 - Cover for underground structure with opening mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lid for an underground structure provided with an opening mechanism for opening a lid body of the lid for an underground structure from a receiving frame.
[0002]
As used herein, the term “underground structure lid” refers to a large iron lid, a manhole lid, a sewage culm lid for closing an opening through which underground structures in sewerage facilities, underground structure facilities, etc. and the ground pass. Or openable joint groove iron lids, power transmission iron lids, wiring iron lids, underground conduits under the road surface in water supply facilities and gas supply facilities, and their accessories A fire hydrant lid, a water control valve lid, a gate valve lid, an air valve lid, a gas pipe lid, a water meter lid, and the like having a function as an open / close door connecting the device and the ground are collectively referred to.
[0003]
[Prior art]
Usually, the lid body of the lid for the underground structure is held in a state where the lid body is taper-fitted to the receiving frame, and when the lid body is excessively bitten by the receiving frame, the lid cannot be opened with a normal bar. Accordingly, various lid opening devices that strongly open the lid body have been proposed, but all of them are heavy, so the lid opening device cannot be carried at all times, and a place where it is difficult to open the lid is found. Each time, the operator had to transport the lid opening device to the site. Therefore, as means for solving this problem, for example, as disclosed in Japanese Utility Model Publication No. 7-45644, a technique for opening the lid body using a lever member provided on the lid body has been proposed.
[0004]
[Problems to be solved by the invention]
However, with this conventional technique, the opening mechanism can be realized at a low cost, but it is impossible to increase the magnification of the force as an insulator from the structural viewpoint. Accordingly, there is a problem that the lid body that is fixed to the receiving frame due to rust or the like cannot be opened.
[0005]
On the other hand, as a mechanism having a strong opening force among the opening mechanisms provided in the lid body, for example, a method of mounting a hydraulic jack mechanism on the back side of the lid body is also conceivable. However, installing the lid body having such a hydraulic jack mechanism for each manhole, for example, is too expensive and lacks reality, and for a long period of time, the hydraulic jack mechanism Had the problem that it had to be constantly maintained in order to rust and not operate.
[0006]
The problem to be solved in the present invention is that a large opening force can be obtained without transporting a heavy opening device, the structure is not complicated, the cost is low, and the device breaks down in any environment. An object of the present invention is to provide a lid for an underground structure with a difficult opening mechanism.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, in the present invention, a first link member having one end rotatably attached to the back surface of the lid body and one end rotatably attached to the receiving frame. A second link member, and at least in a closed state, a booster mechanism configured by engaging the other end of the first link member and the other end of the second link member. We decided to provide it. When the lid is opened, a force is applied to the input means, and the force generated by the input means is transmitted to the booster mechanism, whereby one end of the first link member and the second link member The space between the one end of the cover increases and a force acts in the direction in which the lid body opens to open the lid.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The booster mechanism according to the present invention comprises a toggle joint mechanism in which the other end of the first link member and the other end of the second link member are engaged with each other at least in the closed state. Yes. And when the said lid body opens more than predetermined, engagement with the other end of said 1st link member and the other end of said 2nd link member is cancelled | released.
[0009]
Further, when the input means is in the closed state, the lid body is in a state in which the gripping portion provided at the upper end closes the opening hole provided in the lid body. It may be housed on the back side of this and may be pulled out for use when the lid is opened.
[0010]
Further, when the lid is in the closed state, the input means and the receiving frame or a member attached to the receiving frame are engaged to be in a locked state, and when the lid is opened, the input means is May be released to enter the unlocked state.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
1 to 6 show an embodiment of a lid for an underground structure with an opening mechanism according to the present invention. FIG. 1 is a longitudinal sectional view of a main part, and FIG. FIG. 2B is a cross-sectional view of the main part including the cross section taken along the line BB in FIG. 1. 3 is a plan view showing the direction of the gripping portion of the lever, and FIG. 4 is a vertical sectional view of the main part including the cross section along the line CC in FIG. Further, FIG. 5 is a vertical cross-sectional view of the main part showing a state where the lever is pulled up to the uppermost position, and FIG. 6 is a vertical cross-sectional view of the main part showing a state where the lid body is completely opened from the receiving frame.
[0012]
In the figure, a receiving frame 1 having a tapered receiving surface 1a formed on the inner peripheral surface, and a taper receiving surface 1a of the receiving frame 1 which is held in a taper fitting manner, a tapered surface 2a is formed on the outer peripheral surface, and the peripheral edge of the upper surface The lid main body 2 in which the lid opening hole 2b is formed in the vicinity of the part is disposed in the upper part of, for example, the vertical hole of the underground structure.
[0013]
Reference numeral 3 denotes a lever as an input means. A gripping portion 3a is formed at an upper end portion, and a cross-sectional shape having a predetermined length is formed below the gripping portion 3a following a circular small-diameter portion 3 '. A non-circular portion 3b having an oval cross-sectional shape is integrally formed, and a locking portion 3c for retaining is provided at the lower end portion. When the lever 3 is in the closed state (hereinafter referred to as “always”), the lever 3 supports a through-hole 4e and second link members 5 and 5 formed in a projection 4d of the first link member 4 described later. The cover member 2 is housed on the back side of the lid body 2 in a state of being inserted through a through hole 5e formed in the support member 5a.
[0014]
Further, the planar shape of the gripping portion 3a is substantially the same as the planar shape of the opening hole 2b, and the gripping portion 3a normally closes the opening hole 2b so that rainwater, earth and sand, etc. are underground. It does not flow into the structure.
[0015]
Reference numeral 4 denotes a first link member which is one component of the booster mechanism. The first link member has an end rotatably attached to a support member 4a fixed to a rib 2c on the back surface of the lid body 2 via a support shaft 4b. The other end is formed with a concave engagement surface 4c that engages with an engagement shaft 5c of second link members 5 and 5, which will be described later. Reference numeral 4a 'denotes a position restricting surface provided to restrict the first link member 4 from rotating more than a predetermined amount.
[0016]
On the other hand, 5 and 5 are a pair of second link members which are the other components of the booster mechanism, and can be rotated via a support shaft 5b to a support member 5a whose one end is fixed to the receiving frame 1. It is attached to the shaft. In addition, engagement shafts 5c are inserted into the other ends of the second link members 5 and 5 so as to pass through the other, so that the second link members 5 and 5 operate integrally. Then, the first link member 4 and the second link members 5, 5 are formed in a square shape by always engaging the engagement shaft 5 c with the engagement surface 4 c of the first link member 4 described above. To form a so-called toggle joint mechanism that functions as a booster mechanism.
[0017]
The second link members 5 and 5 are biased toward the inner wall side of the receiving frame 1 by spring members 5d and 5d provided between the support members 5a. As long as no external force is applied, the second link members 5 and 5 are maintained in a state of being connected in a dogleg shape.
[0018]
On the other hand, the first link member 4 is integrally provided with a protruding portion 4d, through which the small diameter portion 3 'and the non-circular portion 3b of the lever 3 can pass, and the locking portion 3c. Is formed with a circular through hole 4e that cannot pass through.
[0019]
As a result, even when the lever 3 is pulled out to the maximum during the lid opening operation to be described later, the locking portion 3c contacts the bottom of the protruding portion 4d, so that the lever 3 does not come out of the protruding portion 4d.
[0020]
The support member 5a that supports the second link members 5 and 5 is also provided with a long hole-like through hole 5e at a position aligned with the above-described through hole 4e. The non-circular portion 3b and the locking portion 3c are configured to be able to select whether or not they can pass depending on the direction of the gripping portion 3a of the lever 3 so that they can always pass through the through hole 5e.
[0021]
That is, when the gripping portion 3a of the lever 3 is in a direction to close the opening hole 2b as shown by the solid line in FIG. 3, the non-circular portion 3b and the locking portion 3c pass through the through hole 5e. It is impossible, and the uppermost part of the non-circular part 3b engages with the lower surface part of the through hole 5e so that the lid cannot be opened.
[0022]
On the other hand, when the direction of the gripping portion 3a is rotated 90 degrees as shown by the broken line in FIG. 3, the non-circular portion 3b and the locking portion 3c can pass through the through hole 5e, and the lock is released and the opening is opened. The lid is ready for use.
[0023]
Normally, the gripping portion 3a of the lever 3 closes the opening hole 2b and is in the above-described locked state, so that the lid main body 2 is moved by, for example, an internal pressure generated in the underground structure. Even if it floats and is about to open, the lid body 2 is not easily opened, and it is possible to prevent a scattering accident and the like.
[0024]
Next, the operation of the lid opening mechanism of this embodiment will be described.
First, the holding part 3a of the lever 3 is pulled up a little and the direction is rotated 90 degrees to release the locked state. In this state, after further lifting the lever 3 and passing through the through hole 5e, until the locking portion 3c at the lower end of the lever 3 comes into contact with the bottom of the projection 4d of the first link member 4 as shown in FIG. Pull up. Then, the lever 3 is pushed down toward the receiving frame 1 in FIG. 5, and the first link member 4 is rotated around the support shaft 4b until it abuts against the position regulating surface 4a ′ of the support member 4a.
[0025]
At this time, the first link member 4 and the second link members 5 and 5 constitute the toggle joint mechanism as described above via the engagement surface 4c and the engagement shaft 5c. When the first link member 4 is rotated as described above in accordance with the operation of the lever 3, the second link member 5 is also rotated around the support shaft 5b.
[0026]
As a result of the above operation, the first link member 4 and the second link member 5 are arranged in a substantially straight line, so that the interval between the support shaft 4b and the support shaft 5b is widened and the lid is opened. The force acts, the taper fitting with the receiving frame 1 is released, and the lid is opened.
[0027]
In this state, when the lever 3 is further lifted upward, the lid body 2 is completely opened as shown in FIG. Since the first link member 4 and the second link members 5 and 5 are merely engaged via the engagement surface 4c and the engagement shaft 5c, the lid body 2 is opened more than a predetermined amount. When the lid is closed, the first link member 4 and the second link members 5 and 5 are disengaged from each other, so that the lid opening operation is not hindered.
[0028]
On the other hand, when the lid is closed, the lid main body 2 is closed with the first link member 4 and the second link members 5 and 5 being in substantially the same position. At this time, the second link members 5 and 5 are urged by the spring members 5d and 5d, respectively, and are in a fixed position as shown in FIG. The members 5 and 5 can be connected, whereby a toggle joint mechanism is formed again. Then, the lever 3 is housed on the back side of the lid body 2 as shown in FIG. 4 in the reverse procedure of opening the lid, and further rotated 90 degrees in the opposite direction to that when the gripping portion 3a is opened. In this way, the lid opening hole 2b is closed by the gripping portion 3a.
[0029]
As mentioned above, although this invention was demonstrated based on the Example, this invention is not limited to an above-described Example, Unless it changes the structure described in the claim, it can implement in any way. For example, instead of a lever housed on the back side of the lid body, an ordinary lid opening bar can be used as the input means. Further, in the embodiment, the first link member and the second link member are pivotally attached to the lid main body and the receiving frame via the support member and the support shaft, respectively. The second link member may be provided with a convex portion (or a concave portion) and the support member may be provided with a concave portion (or a convex portion) so that the second link member can pivot.
[0030]
Further, the first link member and the second link member can be directly attached to the lid body and the receiving frame, respectively, without using the support member. Furthermore, you may comprise so that a 1st link member and a 2nd link member may be connected in the shape of a dogleg of the direction opposite to the figure of an Example.
[0031]
【The invention's effect】
As described above, the lid for an underground structure with an opening mechanism according to the present invention is small and lightweight by the cooperative action of the input means and the booster mechanism without carrying a heavy opening mechanism. Since a large opening force can be obtained, it is possible to open the lid body taper-fitted with a slight force.
[0032]
Further, the lid for an underground structure with an opening mechanism according to the present invention is not complicated in structure, and therefore, the number of parts can be reduced, so that it can be provided at a low price and is less likely to cause a failure, so that maintenance is not required.
[0033]
Since the lid for an underground structure with an opening mechanism in the present invention is normally configured such that the upper end of the input means closes the opening hole provided in the lid body, the underground structure Inflow of rainwater and earth and sand into the inside can be reduced.
[0034]
The lid for an underground structure with an opening mechanism according to the present invention is normally in a locked state, and when the lid is opened, by operating the input means, the engagement is released to an unlocked state. Therefore, the lid main body does not unnecessarily open due to the internal pressure in the underground structure and the like, thereby producing a great effect.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part showing a lid for an underground structure with an opening mechanism in an embodiment of the present invention.
2A is a cross-sectional view of a main part including a cross section along line AA in FIG. 1, and FIG. 2B is a cross-sectional view of a main part including a cross section along line BB in FIG.
FIG. 3 is a plan view showing the direction of the gripping portion of the lever.
4 is a vertical cross-sectional view of a main part including a cross section taken along the line CC of FIG. 2 (b).
FIG. 5 is a longitudinal sectional view of a main part showing a state where the lever is pulled up to the uppermost position.
FIG. 6 is a longitudinal sectional view of a main part showing a state where the lid body is completely opened from the receiving frame.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Receiving frame 1a Taper receiving surface 2 Cover body 2a Tapered surface 2b Opening hole 2c Rib 3 Lever 3 'Small diameter part 3a Gripping part 3b Non-circular part 3c Locking part 4 First link member 4a, 5a Support member 4a ′ Position regulating surface 4b, 5b Support shaft 4c Engagement surface 4d Protrusion 4e, 5e Through hole 5 Second link member 5c Engagement shaft 5d Spring member

Claims (5)

The lid body of the lid for the underground structure functions to open the lid from the receiving frame, one end of the first link member mounted to be rotatable relative to the back surface of the lid body, and one end to the receiving frame. A second link member rotatably mounted, and at least in the closed state, the other end of the first link member and the other end of the second link member are engaged with each other. A cover for an underground structure with an opening mechanism provided with a booster mechanism configured as follows:
When opening the lid, by applying force to the input means and transmitting the force generated by the input means to the boost mechanism, one end of the first link member and one end of the second link member The lid for an underground structure with a lid opening mechanism, wherein a force is applied in a direction in which the lid body opens to widen the gap between the lid body and the lid body. The lid for an underground structure with an opening mechanism according to claim 1, wherein the boosting mechanism constitutes a toggle joint mechanism at least in a closed state. 3. The input device according to claim 1, wherein the input unit is housed on the back side of the lid body in the closed state, and is pulled out and functions when the lid is opened. A lid for an underground structure with a lid opening mechanism according to any one of the above. The gripping portion formed at the upper end portion of the input means is configured to close a hole for opening the lid provided in the lid body when the lid is closed. The lid for an underground structure with an opening mechanism according to any one of claims 3 to 4. When the lid is closed, the input means and the receiving frame or a member attached to the receiving frame are engaged to be locked, and when the lid is opened, the input means is operated. The lid for an underground structure with a lid opening mechanism according to any one of claims 1 to 4, wherein the lid is configured to be unlocked by releasing the engagement.

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