JP3818941B2 - Auxiliary ladder for underground structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention also serves as a fall prevention frame that covers the opening of an underground structure and prevents a person or an object from falling, and is an auxiliary ladder that stands up near the opening and can be used when entering or exiting the underground structure It is about.
[0002]
[Prior art]
Auxiliary ladders used for entering and exiting manholes are of a permanent type that is axially coupled to a lid receiving frame as disclosed in Japanese Utility Model Publication No. 60-33162, and disclosed in Japanese Utility Model Publication No. 62-5087. There is a portable type that can be attached to and detached from the lid receiving frame. Since the permanent type is not considered for convenience of removal, it cannot be used for a plurality of lid receiving frames. On the other hand, while a portable object can be easily removed, the lid cannot be closed while it is still attached to the lid receiving frame. For this reason, it was necessary to remove it before closing the lid.
[0003]
In addition, the conventional auxiliary ladders are not entirely connected to the lid receiving frame even in the case of a permanent type as well as a portable type. For this reason, if the amount of water in the underground structure increases due to increased water, etc., and the internal air is compressed, the action force seeking the escape area concentrates on the opening, and the lid is splashed off or a permanent auxiliary ladder is set up This causes problems such as If the auxiliary ladder is left standing, the opening is released, and there is a danger that a person falls or the vehicle is removed.
[0004]
Therefore, the present applicant has previously developed an auxiliary ladder for underground structures that can close the lid while being attached to the lid receiving frame and is also suitable for carrying. Since such an auxiliary ladder is of a type that can be attached and detached in an unprecedented manner, it is very novel and convenient, and has been highly evaluated not only for safety but also for safety. However, since at least one of the pair of long holes for pivotally supporting the ladder main body to the lid receiving frame is cut out and communicates with the outside, there is a fear that it cannot be said that there is no risk of falling off due to external force. there were.
[0005]
If the auxiliary ladder is dropped, a manhole with a depth of 2 to 3 m can be recovered relatively easily, but if it becomes a deep manhole with a depth of 10 m, there is a sense of fear and the amount of water is so It's not easy. Also, if there is a pump room downstream, it may lead to an unexpected accident.
[0006]
[Problems to be solved by the invention]
The present invention has been made paying attention to the above points, and its problem is an auxiliary ladder for an underground structure that can close the lid while being attached to the lid receiving frame and is also suitable for carrying. It is easy to avoid dropping off.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention comprises a ladder body having a form that can be disposed in a storage space of a lid receiving frame and can close the lid, and the ladder body is connected to the lid receiving frame via a support shaft. The pair of bases has a pair of bases that are detachably attached, and the pair of bases has a long hole for moving the ladder body, and at least one of the long holes has a through hole that leads to the outside. together with the support shaft can pass through, have a configuration which enables fixed superimposed on one of the base closing retaining member Tsuguchi to prevent inadvertent the support shaft is coming off, retaining member, The ladder main body has a closing portion that closes the opening of the ladder main body and a moving portion that can slide the saddle member perpendicular to the base of the ladder main body, and the retaining member is in contact with the base. which took measures that Ru is fixed by a set screw to A.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The auxiliary ladder of the present invention is provided so as to cover an opening such as a manhole provided at an entrance to the underground structure or the like. In order to provide an auxiliary ladder that can be placed with the cover closed to cover the opening, the storage space for the ladder main body having a size that can be disposed under the cover is provided.
[0009]
The ladder body shall cover the opening, and the storage space for the ladder body shall be secured under the closed lid (see FIG. 3). Such a ladder body has a planar size that covers the opening, has a thickness that does not allow as much storage space as possible, and is attached to the opening frame at the lowest possible position. It is desirable to be.
[0010]
Openings often include manholes or other openings for entering and exiting underground structures. The auxiliary ladder is attached to a lid receiving frame or the like forming such an opening via a support shaft so as to be able to rise and fall and to be detachable with one touch. It is a requirement necessary for the auxiliary ladder according to the present invention to be detachable with one touch.
[0011]
The ladder body has a pair of bases that are detachably attached to the lid receiving frame. The part where the pair of bases are to be attached is located on the lid receiving frame side and protrudes into the opening, for example, a part called a step or a handle, and a support shaft is provided there. In order to make the ladder body stand up or beside, it is necessary to move it slightly in the longitudinal direction, and a long hole for this purpose is provided in the base.
[0012]
At least one of the long holes is provided with a passage that leads to the outside so that the movement of disposing the support shaft in the long hole and withdrawing the support shaft from the long hole can be performed with one touch without the operation of attaching or detaching the bolt. ing. This passage is provided with a retaining member so that the support shaft cannot pass except when the auxiliary ladder is attached or detached. It is desirable that the retaining member has a closing portion that serves as a portion for closing the passage and a moving portion for lateral movement, and can be fixed to the ladder body by a set screw. The retaining member can be fixed on the base portion.
[0013]
The latch piece is placed on the tip of the ladder body so that it can move between the locked position where it can be hooked to the mating location inside the opening on the lid receiving frame side and the unlock position where it can be detached from the mating location. Can be attached to. The counterpart location is a location that is a counterpart to which the latch piece is latched. For example, an edge of the opening of the lid receiving frame or a location protruding into the aperture can be the counterpart location. Further, a receiving portion provided in an opening or the like for supporting the tip of the auxiliary ladder can also be used as a lock counterpart. The latching piece is movably attached and at the same time is urged by the elastic means to the locked position. Therefore, while the latching piece is pushed back against the urging force, it is moved to the unlock position. Sliding and rotating can be adopted as the moving form.
[0014]
【Example】
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. The illustrated auxiliary ladder 10 is attached to a lid receiving frame 11 that supports a lid that closes an opening of an underground structure. The ladder body 12 is provided to cover the mouth (opening) of the lid receiving frame 11. The ladder main body 12 is suitable for carrying, and is attached to the base portion so as to be rotatable and detachable by a support shaft 13 so that a prone state and a standing state can be selected. See FIGS.
[0015]
The exemplary ladder body 12 is attached by a support shaft 13 on the same axis of the in-frame protrusion 14 shown as the inside of the step protruding into the opening. The bases 15 and 15 that are the parts to be attached are narrowed by bending inwardly into a crank shape so as to match the interval between the protrusions 14 and 14 from the wide part of the ladder body 12. A long hole 16 for moving the ladder body 12 is formed in each case, and one of the long holes 16, 16 communicates with the outside through a through-hole 17, through which the support shaft 13 can pass. .
[0016]
The base portion 15 having the through-hole 17 is provided with a retaining member 18 that can close the through-hole 17 in order to prevent the support shaft 13 from coming out. The retaining member 18 has a closed long hole 19 having a size and a shape that overlaps with the long hole 16 of the base portion 15, so that the periphery of the long hole 19 becomes a closed portion 20 to close the through-hole 17. it can. The retaining member 18 is also slidable along the saddle member 22 orthogonal to the base 15 at the moving portion 21 so as to open the passage 17 by separating the closing portion 20 from the position where the passage 17 is closed. ing.
[0017]
The illustrated retaining member 18 has a closing portion 20 that can contact the inside of the base portion 15 and a moving portion 21 that can slide along the saddle member 22 in an L shape. Are provided with holding portions 23 and 23 which are bent so as to hold both sides of the cage 22. The moving portion 21 is further formed with a slide hole 24 extending in the slide direction. The slide hole 24 is attached to the flange 22 by screwing the set screw 25 into the female screw 27, and the nut 26 is attached in the attached state. If the screw is loosened, the retaining member 18 can be slid. A stopper 26 is attached to the tip of the set screw 25, so that the set screw 25 is not detached from the saddle member 22 even if the set screw 25 is loosened too much.
[0018]
Therefore, when the retaining member 18 is advanced, the closing portion 20 overlaps with the base portion 15 to close the opening 17, and the upper and lower engaging pieces 28, 28 are held on both sides of the base portion. When the set screw 25 is tightened, the retaining member 18 is integrally fixed to the base portion 15 (FIG. 7C). If the nut 26 is loosened and the retaining member 18 is separated from the base portion 15, the support shaft 13 can pass through the opening 17 (FIG. 7B).
[0019]
The support shaft 13 supports the base portion 15 in a state where the ladder main body 12 is laid down. However, the base portion 15 is supported not only by the support shaft 13 but also by a lower support portion 29. The lower support portion 29 is inclined slightly outward, and a recess 30 into which the base portion 15 of the ladder main body 12 can be inserted is provided therein. The closed portion 20 of the retaining member 18 is also accommodated in the recess 30. The support shaft 13 is provided at the lowest position in the lid receiving frame 11. A storage space S for the auxiliary ladder 10 is set in a portion inward of the support shaft 13 and below the lid receiving portion. See FIG. When the ladder body 12 is erected, the ladder body 12 is inclined slightly outward from the pivot point.
[0020]
In order to remove the auxiliary ladder 10 attached to the lid receiving frame 11, first, the set screw 25 is loosened and the retaining member 18 is slid in a direction to separate the closing portion 20 from the base portion 15, so One base portion 15 of the ladder main body 12 is removed, and then the other base portion 15 is pulled out from the other support shaft 13. This operation does not change when the ladder body 12 is in a face-down state or in a standing state. Rather, it is possible to omit the conventionally required operation of pulling the retaining piece 40 at the tip and removing it from the lid receiving frame 11 in the face down state, and the feature that all attachment and detachment can be performed with one touch is exhibited.
[0021]
The ladder body 12 is supported by the tip protrusions 32 and 32 on the receiving portions 31 and 31 provided in a concave shape on the inner edge of the lid receiving frame when the ladder body 12 is turned down (or collapsed). See FIG. Since the receiving portions 31 and 31 are concave, the tip protrusions 32 and 32 are accommodated and stabilized.
[0022]
One hook piece 40 having the tip protrusion 32 is disposed inside each of the left and right side bars 33 and 34 constituting the ladder body 12, and is connected to a coupling bar 35 that joins the left and right side bars 33 and 34. It can move in the same direction together with the shaft body 36 attached so as to be movable in the front-rear direction. The left and right shaft bodies 36, 36 are engaged with a connector 37 and are urged in a direction protruding forward by a compression spring 38 interposed between the coupling rod 35 and the connector 37. The latching piece 40 is coupled to the shaft body 36 at the base end 39, and the head of the shaft body 36 hits the coupling rod 35 and serves as a stopper that defines the advancement position. It is always placed and can be moved backward by pushing the connector 37. At the advanced position, the leading end of the latching piece 40 enters under the protruding portion 41 provided in the opening of the lid receiving frame 11. Further, the latching piece 40 is set so as to be retractable to the inner side of the protruding portion 41. Reference numeral 42 denotes a guide shaft which is provided forward in the coupling rod 35 and is passed through a hole formed in the connector 37 to help the latch pieces 40 and 40 move in the front-rear direction in parallel. Reference numerals 43 and 43 ′ denote connecting rods constituting the ladder body 12, similar to the connecting rod 35.
[0023]
Such an auxiliary ladder 10 can be carried to a manhole or the like for carrying it and can be attached to the opening. In order to attach, the ladder body 12 is held at the front end, and the long hole 16 that does not have the through hole 17 out of the long holes 16 and 16 in the left and right base portions 15 and 15 is first passed through the support shaft 13. The other support shaft 13 is passed through the long hole 16 from the opening 17, the closing portion 20 of the retaining member 18 is overlaid on the base portion 15, and the set screw 25 is tightened in this state to secure the retaining member. 18 is fixed to the ladder body 12. To bring the ladder body 12 upright, when the base portion 15 is fitted into the recess 30 by pulling it upward, the support shaft 13 comes into contact with the front wall of the long hole 16 and can be raised in a slightly outwardly inclined state. It is the state of FIG. Therefore, the auxiliary ladder 10 can be used for entering and exiting the manhole, and safety can be ensured.
[0024]
On the other hand, in order to place the auxiliary ladder 10 in the face down state, the base 15 is pulled out from the recess 30 and is tilted so as to cover the opening, so that the tip 40 can bypass the protruding portion 41 in the opening. The joint 37 integrated with the lower part is pulled down, the further lowered joint 37 is released, and the latching piece 40 is moved forward by the elasticity of the springs 38, 38 so that the tip part enters under the projecting part 41. It is the state of FIG. In this lying state, the support shaft 13 and the base portion 15 are also engaged in the base portion 15. Therefore, there is no fear that the auxiliary ladder 10 will come off or stand up even if a pushing force is applied due to an increase in internal pressure.
[0025]
【The invention's effect】
Since the present invention is configured and operates as described above, the auxiliary ladder can be attached and detached with one touch, and the auxiliary ladder side base is prevented from coming off from the spindle on the lid receiving frame side in the attached state. Since it is designed not to be pulled out by the member, the auxiliary ladder will not fall off with some external force. Also, it can be used by carrying it in the same way as a conventional portable one and mounting it on a plurality of lid receiving frames, and it has a portable structure, but the lid remains attached to the underground structure. Can be closed, and there is no risk of disengagement even if the internal pressure rises due to water flow and air flow in the underground structure.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of an auxiliary ladder for underground structures according to the present invention.
FIG. 2 is an exploded perspective view showing an enlarged main part.
FIG. 3 is a longitudinal sectional view of the center part of FIG. 1;
4 is a cross-sectional view similar to FIG. 3 in a state where an auxiliary ladder is raised.
FIG. 5 is a plan view showing an embodiment of a ladder body.
6 is a cross-sectional view of the center portion of FIG.
7A is a plan view showing a state in which the retaining member is separated from the base portion. FIG.
(B) The top view which shows the state which fitted the base to the spindle on the lid receiving frame side.
(C) The top view which shows the state which set the retaining member further.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Auxiliary ladder 11 Lid receiving frame 12 Ladder main body 13 Support shaft 15 Base part 16 Long hole 17 Through-hole 18 Retaining member 19 Long hole 20 Closed part 21 Moving part 22 Anchor material 25 Set screw

Claims (1)

It is an auxiliary ladder that covers the opening of the underground structure and serves as a fall prevention frame that can prevent people and objects from falling, and stands near the opening and can be used when entering and exiting the underground structure. ,
The ladder body has a form that can be disposed in the storage space of the lid receiving frame and can close the lid, and the ladder body has a pair of bases that are detachably attached to the lid receiving frame via a support shaft. The pair of bases are provided with long holes for moving the ladder body, and at least one of the long holes has a through hole communicating with the outside, and the spindle can pass through the through hole, and to close retaining member Tsuguchi to prevent the supporting shaft that exits superimposed on one of the base have a fixable to the structure, retaining member closes the through hole closing portions of the ladder body parts and has a杆材the slidable movement section perpendicular to the base of the ladder body, in a state where the closing portion is in contact with the base portion, for retaining members an underground structure by the set screw in a ladder body Ru fixed Auxiliary ladder.

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