JP3738815B2 - Receiving frame for lid for underground structure with ladder for preventing fall - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a receiving frame for a lid for an underground structure provided with a falling prevention ladder equipped with a falling prevention ladder that can be raised and lowered with respect to the receiving frame for the underground structure lid.
[0002]
As used herein, “underground structure lid” refers to a large iron lid, a manhole lid, a sewage culm lid, an electric / Openable and closable joint gutter lids, power transmission iron lids, power distribution iron lids , buried underground pipes in waterworks and gas pipes, and their associated equipment to protect underground facilities equipment and underground cables in communications A fire hydrant lid, a water control valve lid, a gate valve lid, an air valve lid, a gas piping lid, a water meter, etc., which function as an open / close door.
[0003]
[Prior art]
Various types of lids for underground structures are installed above underground structures such as manhole-side blocks, and from a receiving frame embedded in the ground, and a lid body attached to the receiving frame via a hinge fitting so that it can be opened and closed. It is configured. A step is provided on the inner periphery of the underground structure so that the operator can put his / her foot on and hold it with his / her hand when the operator ascends / descends for maintenance / inspection work such as underground underground conduits. On the other hand, there is also a handgrip formed on the inner periphery of the receiving frame for gripping by a hand when the operator moves up and down. Such a receiving frame has a fall prevention as described in Utility Model Registration No. 2531357. It is known to attach a ladder to a handhold so that it can be raised and lowered.
[0004]
The fall-preventing ladder described in this publication is formed by extending attachment brackets to the center side of the receiving frame on beam-shaped grips provided at two locations on the inner periphery of the receiving frame with a hinge seat in between. Then, a connecting rod is fixed to the tip end side (center side of the receiving frame) of the mounting bracket, and a fall prevention ladder is attached to the connecting rod so as to be raised and lowered. Such a fall-preventing ladder can prevent the operator from falling when it falls, and can be used as a ladder when entering and exiting the underground structure when it stands up.
[0005]
[Problems to be solved by the invention]
However, since the fall prevention ladder can be raised and lowered with the connecting rod on the tip side of the mounting bracket fixed to the hand grip as a rotation shaft, there is no problem in the lying state, but in the standing state, the center of the receiving frame is more than the hand grip. The effective inner diameter when the operator moves up and down is reduced. Therefore, it becomes difficult for the operator to move up and down, which affects workability.
[0006]
The present invention provides a receiving frame for a lid for an underground structure provided with a falling prevention ladder capable of securing an effective inner diameter of the receiving frame and improving workability when the falling prevention ladder is erected on a receiving frame formed with a hand grip. The purpose is to do.
[0007]
[Means for Solving the Problems]
The present invention is for an underground structure equipped with a fall prevention ladder that is mounted on a receiving frame having a handgrip on its inner periphery so that it can be raised and lowered and is supported by a support seat whose tip side is formed on the inner periphery of the receiving frame in a lying state. In the receiving frame of the lid,
And on the holding plate to be placed across the upper surface of the holding seat and hand grip formed in the inner circumference of the receiving frame, the holding member ing from the lower holding plate which is in contact with the lower surface of the holding seat and / or hand grip but through the upper holding plate and the bolt hole formed in the lower holding plate, it is fixed by bolts and nuts,
A notch or an insertion hole is formed at a position between the holding seat and the hand grip of the holding arm provided in the upper holding plate,
At the base end of the fall prevention ladder, a hook portion bent in an L shape is formed, and in the hook portion, a tapered insertion portion to be inserted into the notch or the insertion hole is formed ,
When the fall prevention ladder is erected, the insertion part is inserted into the notch or the insertion hole, and is brought into contact with the abutting part of the lower holding plate so that the standing posture can be maintained.
The opening of the hook portion is provided with an openable / closable locking tool.
[0008]
With this configuration, when the fall prevention ladder is erected, it rises near the inner periphery of the receiving frame (between the holding seat and the handgrip), so a fall prevention ladder is stretched on the center side of the receiving frame. It can be raised and lowered easily without interfering with the operator.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the receiving frame for an underground structure lid provided with the fall prevention ladder according to the present invention, the holding member is mounted on a holding seat formed on the inner periphery of the receiving frame and is mounted on the upper surface of the handgrip via the holding arm. An upper holding plate, and a lower holding plate that is in contact with the lower surface of the holding seat and / or the handgrip and sandwiches the holding seat and / or the handgrip together with the upper holding plate, When standing up, the insertion portion is brought into contact with the notch or insertion hole formed in the holding arm of the upper holding plate and the abutting portion of the lower holding plate, so that the standing posture can be held, thereby preventing falling. The standing posture of the ladder can be securely held.
[0010]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a receiving frame for an underground structure lid provided with a fall prevention ladder according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view taken along line AA in FIG.
[0011]
In the figure, a hinge seat 1a is formed on the inner periphery of an annular receiving frame 1, and a lid body 2 is attached to the hinge seat 1a via a hinge fitting 1b so as to be opened and closed. FIG. 2 shows a part of a state in which the lid body 2 is horizontally turned and opened. In addition, a pair of hand grips 3 and 4 are formed on the inner periphery of the receiving frame 1 with the hinge 1a interposed therebetween. These hand grips 3 and 4 are formed so as to have hand grip openings 3 a and 4 a that allow a hand to be inserted between the inner periphery of the receiving frame 1. And the fall prevention ladder 5 is mounted | worn so that raising / lowering is possible by using the handgrips 3 and 4 part as a fulcrum.
[0012]
The fall prevention ladder 5 is mainly composed of a pair of left and right arms 5a, and a reed 5b bridged between the arms 5a. At the base end of the arm 5a, a hook portion 5c (FIG. 2) bent substantially in an L shape connected to the hand grips 3 and 4 is formed, and on the support seat 1c protruding to the inner periphery of the receiving frame 1 at the tip. 5d (FIG. 1) is formed.
[0013]
FIG. 3 is an enlarged plan view showing an attachment structure of the fall prevention ladder 5 to the hand grip 3, and FIG. 4 is an exploded perspective view of a main part showing the attachment structure of the fall prevention ladder 5.
[0014]
As shown in FIG. 4, a holding seat 1d connected to the upper surface of the hand grip 3 is formed on the inner periphery of the receiving frame 1, and a protrusion 1e is provided on the upper surface of the holding seat 1d in the vicinity of the hand grip opening 3a. Yes. The holding seat 1d is provided with a holding member 6 for restraining the falling prevention ladder 5 to the standing posture when the standing ladder 5 is raised.
[0015]
The holding member 6 includes an upper holding plate 7 and a lower holding plate 8. The upper holding plate 7 is provided with an opening 7a and a bolt hole 7b for fitting to the protrusion 1e and a holding arm 7c. The holding arm 7c has a hook. A notch 7d for allowing the portion 5c to pass therethrough is formed to open to the outside. On the other hand, the lower holding plate 8 is provided with ribs 8a for constraining the posture with the upper holding plate 7 and having bolt holes 8b. The upper holding plate 7 and the lower holding plate 8 align the opening 7a of the upper holding plate 7 with the projection 1e of the holding seat 1d, and bring the rib 8a of the lower holding plate 8 into contact with the lower surface of the upper holding plate 7, By screwing the nut 9b into the bolt 9a passed through the bolt holes 7b, 8b, the upper holding plate 7 and the lower holding plate 8 sandwich and hold the holding seat 1d with the rib 8a as a fulcrum. When fixed in this way, the lower holding plate 8 is disposed in a portion that occupies a part of the handgrip opening 3a from the holding seat 1d as shown by a broken line in FIG. The upper holding plate 7 is fixed in a state where the holding arm 7c straddles the hand grip opening 3a and the tip thereof is placed on the upper surface of the hand grip 3, and the notch 7d is positioned so as to face the hand grip opening 3a. As for the other hand grip 4, as shown in FIG. 1, the upper holding plate 7 and the lower holding plate 8 are arranged by the same mounting structure so as to be symmetrical with respect to the hinge 1a.
[0016]
As shown in FIGS. 1 and 2, the hook portion 5 c of the arm 5 a of the fall prevention ladder 5 is inserted into the hand grip opening 3 a through the notch 7 d of the holding arm 7 c of the upper holding plate 7. That is, the hook portion 5c is mounted by dropping from the notch 7d toward the handgrip opening 3a across the tip of the holding arm 7c of the upper holding plate 7, and the side surface of the hook portion 5c is placed on the side surface of the notch 7d as shown in FIG. The hook portion 5c is prevented from shifting to the left and right. Further, the hook portion 5c is formed with a tapered insertion portion 5e to be inserted and fitted into the notch 7d when the fall prevention ladder 5 is erected as shown in FIG. In addition, 5f shown in FIG. 2 is a locking tool that closes the opening of the hook portion 5c bent in an L shape so as to be openable and closable. The locking device 5f is removed and the hook portion 5c is passed through the notch 7d. The stopper 5f is closed so that the hook portion 5c is not accidentally removed from the notch 7d in the middle of raising the fall prevention ladder 5. The mounting structure of the hook portion 5c is exactly the same for the other handgrip 4 side.
[0017]
In the above configuration, when the fall prevention ladder 5 is tilted, the fall prevention ladder 5 is held in a horizontal posture within the receiving frame 1 as shown in FIGS. 1 and 2. That is, the hook portion 5c is supported by the tip of the holding arm 7c of the upper holding plate 7 placed on the upper surfaces of the grips 3 and 4, and the seat portion 5d on the tip side is held on the support seat 1c. . At this time, the hook portions 5c of the pair of arms 5a enter the notches 7d of the upper holding plate 7, and the side surfaces of the hook portions 5c and the side surfaces of the notches 7d are in contact with each other. Is done. Further, as shown in FIG. 1, the front end of the seating portion 5d is in contact with the inner peripheral surface of the receiving frame 1, and the front end of the lower holding plate 8 is in contact with the hook portion 5c as shown in FIG. In FIG. 2, the movement in the left-right direction is also restricted. Therefore, the fall-preventing ladder 5 is stably held in the receiving frame 1 without any movement, and it is possible to reliably prevent an accident that the operator falls accidentally when the lid body 2 is opened.
[0018]
On the other hand, when using the fall prevention ladder 5 as a ladder when standing up and down in the underground structure, the tip end side of the fall prevention ladder 5 is pulled up from the state shown in FIG. As a result, the fall prevention ladder 5 can be erected from the receiving frame 1 as shown in FIGS. In this standing posture, as shown in the enlarged view of FIG. 6, the insertion portion 5 e is tapered, so that it can bite into the notch 7 d of the upper holding plate 7 to prevent the lower holding plate 8 from falling and rattling. Since the abutting portion 8c abuts on the insertion portion 5e, the fall-preventing ladder 5 is stably held in the posture shown in FIG. 5 and does not fall down even when the operator's load is applied.
[0019]
When returning the fall prevention ladder 5 to the tilted position shown in FIGS. 1 and 2, the fall prevention ladder 5 is turned clockwise in FIG. As a result, the bite between the insertion portion 5e and the notch 7d is released, and the hook portion 5c rotates while passing through the notch 7d, so that the fall prevention ladder 5 can be stored in the receiving frame 1. .
[0020]
In the embodiment of the present invention, since the upper holding plate 7 and the lower holding plate 8 are securely fixed to the holding seat 1d and the grips 3 and 4 on the inner periphery of the receiving frame 1, the undulation state of the fall prevention ladder 5 is ensured. Can be held stably. The rotation center of the fall prevention ladder 5 corresponds to the notch 7d of the upper holding plate 7 through which the hook portion 5c passes, and this notch 7d is located in the handgrip openings 3a and 4a of the handgrips 3 and 4. . Therefore, when the fall-preventing ladder 5 is erected, it can be raised near the inner periphery of the receiving frame 1, and the inside of the receiving frame 1 can be opened wider than the configuration described in the gazette described as the prior art. For this reason, the effective open inner diameter in the receiving frame 1 when an operator raises / lowers can be taken large, and workability | operativity can be improved.
[0021]
As described above, in the embodiment, the description has been given on the assumption that the notch 7d is formed on the outer side of the upper holding plate 7. However, instead of the notch 7d, a notch with the inner side opened so as to face the hook may be used. It is good also as an insertion hole through which 5c can pass.
[0022]
In the embodiment, the base end of the arm 5a is the L-shaped hook portion 5c and the base end is the insertion portion 5e. However, the arm 5a may be extended in a rod shape, and in this case, when standing up The extension portion is inserted into the notch 7d or the insertion hole of the upper holding plate 7 as an insertion portion.
[0023]
In the embodiment, the holding member 6 is configured to hold the holding seat 1d between the upper holding plate 7 and the lower holding plate 8, but a through hole is formed in the upper holding plate and the holding seat. Alternatively, only the upper holding plate may be fixed across the holding seat and the hand grip by inserting a bolt. Further, in the embodiment, the lower holding plate 8 is not brought into contact with the lower surfaces of the hand grips 3 and 4, but both the holding seat 1 d and the hand grips 3 and 4 are formed by the upper holding plate 7 and the lower holding plate 8. You may fix so that it may be pinched | interposed.
[0024]
【The invention's effect】
In the present invention, for an underground structure provided with a falling prevention ladder supported on a support seat formed on the inner periphery of the receiving frame in a lying state while being mounted in a undulating manner on a receiving frame having a handgrip on the inner periphery. In the receiving frame of the lid,
And on the holding plate to be placed across the upper surface of the holding seat and hand grip formed in the inner circumference of the receiving frame, the holding member ing from the lower holding plate which is in contact with the lower surface of the holding seat and / or hand grip but through the upper holding plate and the bolt hole formed in the lower holding plate, it is fixed by bolts and nuts,
A notch or an insertion hole is formed at a position between the holding seat and the hand grip of the holding arm provided in the upper holding plate,
At the base end of the fall prevention ladder, a hook portion bent in an L shape is formed, and in the hook portion, a tapered insertion portion to be inserted into the notch or the insertion hole is formed ,
When the fall prevention ladder is erected, the insertion part is inserted into the notch or the insertion hole, and is brought into contact with the abutting part of the lower holding plate so that the standing posture can be maintained.
Since the opening of the hook part is provided with an openable / closable locking tool, when the ladder for fall prevention is erected, it rises near the inner periphery of the receiving frame (between the holding seat and the hand grip). This prevents the fall prevention ladder from projecting to the center side of the machine, making it easier for the operator to move up and down.
[0025]
The holding member is placed on a holding seat formed on the inner periphery of the receiving frame and is placed on the upper surface of the handgrip through the holding arm, and the lower surface of the holding seat and / or the handgrip. And a lower holding plate that holds the holding seat and / or the hand grip together with the upper holding plate, and when the fall prevention ladder is raised, the insertion portion is used as a holding arm of the upper holding plate. Since the standing posture can be held by contacting the formed notch or insertion hole and the contact portion of the lower holding plate, the standing posture of the fall prevention ladder can be reliably held.
[Brief description of the drawings]
FIG. 1 is a plan view of a receiving frame for an underground structure lid provided with a fall prevention ladder according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view taken along line AA in FIG.
FIG. 3 is an enlarged plan view of a main part showing an attachment structure of a fall prevention ladder by an upper holding plate and a lower holding plate.
FIG. 4 is an exploded perspective view of a hand grip and an upper holding plate and a lower holding plate.
FIG. 5 is a longitudinal sectional view when the fall prevention ladder is raised.
FIG. 6 is an enlarged longitudinal sectional view showing a main part when a fall prevention ladder is raised.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Receiving frame 1c Support seat 1d Holding seat 1e Protrusion 2 Lid main body 3, 4 Hand grip 3a, 4a Hand grip opening 5 Fall prevention ladder 5a Arm 5b Reed 5c Hook part 5d Seat part 5e Insert part 5f Locking tool 6 Holding Member 7 Upper holding plate 7a Opening 7b Bolt hole 7c Holding arm 7d Notch 8 Lower holding plate 8a Rib 8b Bolt hole 8c Abutting portion 9a Bolt 9b Nut

Claims (1)

In a receiving frame for a lid for an underground structure, which is mounted on a receiving frame having a handgrip on its inner circumference so that it can be raised and lowered, and has a fall-preventing ladder supported by a support seat formed on the inner circumference of the receiving frame in a lying state ,
And on the holding plate to be placed across the upper surface of the holding seat and hand grip formed in the inner circumference of the receiving frame, the holding member ing from the lower holding plate which is in contact with the lower surface of the holding seat and / or hand grip but through the upper holding plate and the bolt hole formed in the lower holding plate, it is fixed by bolts and nuts,
A notch or an insertion hole is formed at a position between the holding seat and the hand grip of the holding arm provided in the upper holding plate,
At the base end of the fall prevention ladder, a hook portion bent in an L shape is formed, and in the hook portion, a tapered insertion portion to be inserted into the notch or the insertion hole is formed ,
When the fall prevention ladder is erected, the insertion part is inserted into the notch or the insertion hole, and is brought into contact with the abutting part of the lower holding plate so that the standing posture can be maintained.
A receiving frame for a lid for an underground structure provided with a fall prevention ladder, wherein an opening and closing latch is provided at an opening of the hook portion.

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