JPH064154U - Lid receiving frame for underground structure equipped with ladder - Google Patents

Abstract

(57) [Abstract] [Purpose] This problem is solved in a lid receiving frame for an underground structure equipped with a ladder that can be undulated to prevent falling and ascend / descend. It is a simple operation and the ladder is in a standing state. Hold securely. [Structure] A receiving frame 1 provided with a mounting seat 2 on an inner peripheral surface of an opening,
Mounting member 4 mounted on mounting seat 2, and mounting member 4
A ladder 3 pivotably supported on a support shaft 10 provided on the base 3, a long hole 9 through which the support shaft 10 is inserted at the base end portion of the ladder 3 and which allows the ladder 3 to descend in a standing state; A connecting rod 8 having a contact surface 8c that abuts the mounting member 4 in the upright state is provided, and further, a fixture 18 that abuts the ladder 3 on the mounting member 4 when the ladder 3 is upright.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lid receiving frame for an underground structure provided with a ladder for falling prevention and ascending / descending provided in an opening portion of a receiving frame installed as an underground structure for water and sewage, power communication and the like.

[0002]

[Prior art]

 Conventionally, as a lid receiving frame for an underground structure provided with a ladder for preventing falls and a ladder for raising and lowering, for example, a manhole with a ladder disclosed in Japanese Utility Model Publication No. 60-33162 is known.

In this manhole, a pivoting piece for pivotally supporting the left and right side rods of the ladder is provided on the inner peripheral surface of the lid frame, and the base of the side rod of the ladder is pivotally supported by a pin on the pivoting piece. In addition, a fixing mechanism for directly fixing the side rod of the ladder and the pivoting piece in an upright state is provided.

With such a structure, the ladder can be used while standing up and down, and when it is not needed, it can be used as a fall prevention by covering the opening of the lid frame by falling it down.

[0005]

[Problems to be solved by the device]

 However, since this ladder-lid frame fixing mechanism has a structure in which a long hole is formed in the base of the side rod of the ladder and the base of this side rod is dropped into the hole formed in the pivot piece to fix it, It is necessary to form the inner diameter of the larger than the outer diameter of the side rod. Therefore, the stability in the standing state is lacking, and when a large horizontal force is applied to the tip of the ladder during use, the user tends to wobble, which gives the user anxiety. In addition, if the long holes are made longer and inserted deeper to increase the stability, the fixing mechanism itself may be damaged if a strong horizontal load is applied to the tip of the ladder. Further, if the hole of the pivotal piece is formed with almost no gap to the extent of the outer diameter of the side rod in order to reduce the wobbling, there is a problem that the operability is poor because it is difficult to drop the ladder into the hole.

The present invention solves such a problem in a lid receiving frame for an underground structure provided with a ladder that can be undulated to prevent falling and ascend / descend, and ensures that the ladder is in an upright state with a simple operation. The purpose is to hold.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, a lid receiving frame for an underground structure equipped with a ladder according to the present invention has a receiving frame provided with a mounting seat on the inner peripheral surface of an opening, a mounting member mounted on the mounting seat, and the mounting frame. A ladder provided on a supporting shaft provided on the member so as to be capable of undulating, and a long hole through which the supporting shaft is inserted at the base end portion of the ladder and which allows the ladder to descend in the standing state, and in the standing state. A connecting rod having an abutting surface that abuts the mounting member is provided, and further, a fixture for abutting the ladder on the mounting member in a state where the ladder is erected is provided.

[0008]

[Action]

 In the lid receiving frame for an underground structure equipped with the ladder of the present invention, in the upright state, the contact between the contact surface of the ladder and the mounting member prevents the inward rotation of the receiving frame, and further the mounting member is provided with the mounting member. By contacting the fixing device with the ladder against the ladder, it is possible to prevent the rotation toward the outside of the receiving frame, and even if there is some gap between the contact surface between the ladder and the mounting member, it may be securely fixed and play may occur. Absent.

[0009]

【Example】

 Next, the features of the present invention will be specifically described based on the embodiments shown in the drawings.

FIG. 1 is a plan view of a lid receiving frame for an underground structure equipped with the ladder of the present embodiment showing a state in which the ladder is tilted, FIG. 2 is a perspective view of an essential part of FIG. 1, and FIG. 3 is an exploded view of FIG. It is a perspective view.

Reference numeral 1 is a receiving frame for a lid for an underground structure, and a mounting seat 2 is provided on the inner peripheral surface of the opening. As shown in FIG. 3, the mounting seat 2 has an arcuate horizontal shelf 2a extending inward from the inner peripheral surface of the opening, and a projection 2b projecting upward from the horizontal shelf 2a. There are 6 locations on the inner surface of 1 at equal intervals of 60 degrees. A ladder 3 is used for raising and lowering or for preventing falling, and is movably mounted in the receiving frame 1 by a support shaft 10 via two mounting members 4 mounted on the mounting seat 2.

The ladder 3 has a pair of left and right symmetrically arranged frames 5, and five horizontal rods 6 connecting the frames 5, and an L-shaped locking piece 7 is provided on the outer periphery of the frame 5. There are some places. The locking piece 7 is locked to the mounting seat 2 provided on the inner peripheral surface of the opening of the receiving frame 1 in a state where the ladder 3 is tilted, and forms a notch 7a that locks to the protrusion 2b of the mounting seat 2. Further, a connecting rod 8 connected to the frame 5 and the horizontal rod 6 is provided at the left and right base ends of the frame 5.

As shown in FIGS. 2 and 4, the connecting rod 8 has a widened portion 8a formed on the frame 5 mounting side and a stepped portion 8d provided on the other side so as to be mounted on the mounting member 4 by a width. A narrow portion 8b is formed, and a vertically long slot 9 through which the spindle 10 is inserted is formed in the narrow portion 8b. The long hole 9 has a semicircular shape R ₁ on the upper end side that is slightly narrower than the diameter D of the insertion portion 10a, and the lower end side of the insertion portion 10a has a diameter D so that the insertion portion 10a of the support shaft 10 is pushed in in the upright state. It is formed in a slightly larger R ₂ semicircular shape. Reference numeral 11 denotes a fixed block of a substantially rectangular parallelepiped projecting on the side where the connecting rods 8 face each other, and forms a tapered surface 11a that is slightly inclined downward with respect to the contact surface 8c of the connecting rod 8.

As shown in the exploded perspective view of FIG. 3, the mounting member 4 is arranged below the mounting seat 2 and has a lower block 12 having an inverted L-shaped cross section and having two bolt holes 12a. The upper block 13 arranged on the upper side, and the bolt 14 and the nut 14a for connecting and fixing the upper block 13 to each other.

The upper block 13 includes a base portion 15 having a notch 15 a into which the projection 2 b provided on the mounting seat 2 of the receiving frame 1 can be fitted and a bolt hole 15 b, and a hanging piece 16 hanging from one end of the base portion 15. And a support piece 17 formed at the lower end of the hanging piece 16 so as to project inwardly of the receiving frame and having a through hole 17a for mounting a support shaft. The tool 18 is formed. The upper surface of the support piece 17 is used as a receiving surface 17b that receives the stepped portion 8d of the connecting rod 8.

As shown in FIG. 5, the fixture 18 is screwed to a main body 18a having a female screw 18b, a hexagon socket head bolt 18c screwed to the female screw 18b, and a hexagon socket head bolt 18c. It is composed of a nut 18d, and the tip of the hexagon socket head cap bolt 18c projects toward the inside of the receiving frame. Reference numeral 18f is a sphere that is rotatably loosely fitted to the tip of the hexagon socket head cap screw 18c to form a flat surface portion 18e.

In the ladder 3, the insertion portion 10a formed in the support shaft 10 is inserted into the elongated hole 9 of the connecting rod 8 and the through hole 17a formed in the support piece 17 of the upper block 13, and the nut 10b is screwed. It is connected so that it can rise and fall.

In the above structure, when the ladder is used for preventing falling, as shown in FIG. 1, the ladder is in a collapsed state so as to cover substantially the entire opening of the receiving frame.

When used as a ladder for raising and lowering, the tip end side of the ladder 3 is lifted and rotated to be in an upright state. At this time, as shown in FIG. 6, the ladder 3 falls due to the weight of the ladder 3, and the support shaft 10 is positioned above the through hole 9.

In this state, the contact surface 8c of the connecting rod 8 of the ladder 3 and the contact surface 16a of the hanging piece 16 of the upper block 13 are substantially in contact with each other, and the step portion 8d of the connecting rod 8 is further Since it is in contact with the receiving surface 17b, the inward rotation of the ladder 3 is prevented. Further, since the upper portion of the long hole 9 is formed to be slightly smaller than the diameter of the insertion portion 10a of the support shaft 10, even when the insertion portion 10a and the long hole 9 are engaged with each other, the standing up ladder 3 is prevented from rattling. Be done. Further, by advancing the hexagon socket head cap screw 18c of the fixture 18, the tip of the hexagon socket head cap screw 18c is brought into contact with the taper surface 11a of the fixing block 11 so that it is difficult to insert it during use to prevent rattling. You can At this time, since the lock nut 18d is screwed into the hexagon socket head cap screw 18c, the hexagon socket head cap screw 18c is prevented from loosening, and rattling can be reliably prevented even when the ladder is in use.

In order to change the standing state to the lying state, the ladder 3 is lifted and tilted until the insertion portion 10a of the support shaft 10 is located at the lower end of the elongated hole 9 to bring the lying state shown in FIG. You can

In this way, the lid receiving frame for an underground structure provided with the ladder of this embodiment is easy to handle, but first of all, first, the contact surface 8c of the connecting rod 8 of the ladder 3 and the upper block 13 are connected. Of rotation of the hanging piece 16 by contact with the contact surface 16a, secondly rotation of the hanging piece 16 by contact between the stepped portion 8d of the connecting rod 8 and the receiving surface 17b of the support piece 17, and thirdly, the support shaft. Prevention of rattling due to the engagement of the insertion portion 10a of 10 with the long hole 9, and fourthly, prevention of rattling due to contact between the tip of the hexagon socket head cap bolt 18c provided on the fixture 18 and the tapered surface 11a of the fixed block 11. Since it is provided with four rotation preventing and rattling preventing means, it is possible not only to prevent rotation during use but also to prevent rattling completely.

Although the fixed block 11 is provided at the upper position apart from the elongated hole 9 in the above embodiment, it may be a fixed block 20 having a contact surface 20a continuous from the lower portion as shown in FIG. . With this arrangement, even if the gap between the connecting rod 8 and the support piece 17 is made extremely small, the sphere 18f loosely fitted to the tip of the hexagon socket head cap bolt 18c hits the lower part of the contact surface 20a when the ladder 3 is dropped. Since they come into contact with each other, they are guided by the contact surface 20a and are easily dropped. However, in this case, it is preferable not to form the flat portion 18e on the sphere 18f.

[0024]

As described above, the underground structure lid receiving frame including the ladder of the present invention is prevented from rotating by the contact between the contact surface of the ladder and the mounting member in the upright state. . Furthermore, even if there is a slight gap between the contact surface between the ladder and the mounting member by abutting the fixture provided on the mounting member on the ladder, it is securely fixed and no rattling occurs, and the user is It is highly safe without giving anxiety.

[Brief description of drawings]

FIG. 1 is a plan view of a lid receiving frame for an underground structure equipped with the ladder of this embodiment showing a state in which the ladder is tilted.

FIG. 2 is a perspective view around a mounting seat in the state of FIG.

3 is an exploded perspective view around the mounting seat shown in FIG. 2. FIG.

FIG. 4 is a front view of a main part of a connecting rod.

FIG. 5 is a partially cutaway front view of the fixture.

FIG. 6 is a front view of an essential part showing a standing state of a ladder.

FIG. 7 is a front view of another embodiment of the fixing block provided on the connecting rod.

[Explanation of symbols]

1 receiving frame, 2 mounting seat, 2a horizontal shelf, 2b projection,
3 ladders, 4 mounting members, 5 frames, 6 horizontal rods,
7 Locking piece, 7a Notch, 8 Connecting rod, 8a Widened part, 8
b narrow part, 9 long hole, 10 support shaft, 10a insertion part,
10b nut, 11 fixed block, 11a tapered surface, 12 lower block, 12a bolt hole, 13 upper block, 14 bolt, 14a nut, 15 base part, 15a notch, 15b bolt hole, 16 hanging piece,
17 support piece, 17a through hole, 18 fixture, 18a
Body, 18b female screw, 18c hexagon socket head cap screw, 18
d nut

Claims (1)

[Scope of utility model registration request] 1. A receiving frame having a mounting seat on the inner peripheral surface of the opening,
An attachment member attached to the attachment seat and a ladder pivotably supported by a support shaft provided on the attachment member are provided, and the support shaft is inserted into the base end portion of the ladder in a standing state. A connecting rod having a long hole that allows the ladder to be lowered and a contact surface that abuts against the mounting member in the upright state is provided, and further, the mounting member is abutted against the ladder while the ladder is upright. A lid receiving frame for an underground structure, which is equipped with a ladder and is equipped with a tool.