JP3786468B2 - Locking device for shielding lid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a locking device for a shielding lid capable of preventing forgetting to lock.
[0002]
[Prior art]
A shielding lid that shields manholes, various inspection ports, side grooves, and the like is provided with a locking device to prevent unnecessary opening by a third party.
[0003]
As shown in FIG. 7, in the conventional locking device, a detachable shielding cap d is attached to an upper portion of a locking hole c provided on the side of the shielding lid b mounted on the lid receiving frame a. An operating shaft body f having an engaging claw piece e at the lower end is accommodated in the vertical direction, and the engaging claw piece e is engaged with the lid receiving frame a by rotating the operating shaft body f. It is comprised so that rotation conversion may be carried out to a position and the unlocking position which is not engaged.
[0004]
[Problems to be solved by the invention]
The locking and unlocking operations of the locking device are performed by removing the shielding cap d with a dedicated handle and rotating the operating shaft body f approximately 90 ° in either the forward or reverse direction. Since it only rotates at the back position in the locking hole c, it is difficult to distinguish between the locked state and the unlocked state. For this reason, forgetting to lock is likely to occur, and there is a problem that an operation error occurs in which the shielding cap d is attached in an unlocked state.
[0005]
An object of the present invention is to provide a locking device for a shielding lid that can eliminate the conventional problems.
[0006]
[Means for Solving the Problems]
The present invention provides a locking mechanism in which an operating shaft body for rotating the engaging claw piece provided at the lower end between a locking position for engaging with a lid receiving frame and an unlocking position for disengaging is provided on the side of the shielding lid. An urging means is provided that is accommodated vertically in the hole and moves the operating shaft body to the upper position in the locking hole at the unlocking position of the engaging claw piece.
[0007]
In this configuration, a locking hole is provided on the side of the shielding lid mounted on the lid receiving frame, and the operation shaft body is accommodated in the vertical direction in the locking hole, and the lower portion of the operation shaft body is downward from the locking hole. An engaging claw piece that is rotated and converted into a locking position that engages with the lid receiving frame and an unlocking position that does not engage is provided at the lower end of the engaging shaft body by rotating the operating shaft body. An urging means comprising a ridge for moving the operating shaft body to the upper position within the locking hole at the unlocking position of the claw piece is provided.
[0008]
In addition, the operation shaft that has been moved to the upper position in the locking hole at the unlocking position of the engaging claw piece makes it impossible to attach the shielding cap attached to the upper part of the locking hole .
[0009]
In such a configuration, when the engaging claw piece is in the unlocked position where it does not engage with the lid receiving frame, the operating shaft body is moved to the upper position of the locking hole. Can be visually recognized. Thereby, it can be easily known that it is in an unlocked state, and locking is not forgotten.
[0010]
In addition, if the operation shaft body moved to the upper position in the locking hole at the unlocking position of the engaging claw piece is made incapable of being attached to the upper part of the locking hole, the shielding cap Since it is impossible to attach the shield cap, it can be seen that it is in an unlocked state, and an operation error such as attaching a shielding cap in the unlocked state can be prevented.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
In the drawings, reference numeral 1 denotes a lid receiving frame disposed on the upper side edges of manholes, various inspection ports, side grooves x and the like. The lid receiving frame 1 includes a mounting edge 3 protruding inward from the side wall portion 2, and an engagement groove 5 is formed between the lower surface of the mounting edge 3 and the substrate portion 4. The lower surface of the riding edge 3 is a locking surface 3 ′.
[0012]
Reference numeral 6 denotes a shielding lid that is mounted on the lid receiving frame 1 and shields manholes, various inspection ports, side grooves x and the like. The illustrated shielding lid 6 is configured as an iron lid for color pavement, and is formed in a shallow bottom frame shape having an edge wall 8 on the peripheral edge of the bottom wall 7, and the lid receiving frame 1 is provided inside thereof. The same pavement material 9 as the pavement material 9 laid around can be filled. The shielding lid 6 is placed on the lid receiving frame 1 by placing a support protrusion 10 formed on the lower surface side of the bottom wall 7 on the mounting edge 3.
[0013]
On the side of the shielding lid 6, a cylindrical body 11 is disposed in the vertical direction through the bottom wall 7 of the shielding lid 6, and a locking hole 12 is provided therein. The cylinder 11 is fixed by screwing a fixing plate 13 fixed to the outer peripheral portion to the bottom wall 7 with bolts 14a and nuts 14b, and a bottom plate 16 having an insertion hole 15 at the center is fixed to the bottom thereof. Thus, the locking hole 12 has a bottomed shape. A decorative plate 17 is fixed to the upper end of the cylindrical body 11 at a height that is flush with the upper surface of the shielding lid 6. The decorative plate 17 has a communication hole 18 that communicates with the locking hole 12 at a concentric position. Is formed.
[0014]
A female screw 19 is formed on the inner periphery of the locking hole 12, and a male screw part 20 formed on the body part is screwed into the female screw 19, and a shielding cap 21 is detachably attached from above. The The thickness of the head portion 22 of the shielding cap 21 is substantially the same as that of the decorative plate 17, and is flush with the upper surface of the decorative plate 17 in the communication hole 18 in the attached state. A rotation operation groove 23 is formed in the head 22 of the shielding cap 21. The rotation operation groove 23 has a groove shape that matches a special key shape so that rotation operation by a general tool such as a screwdriver cannot be performed.
[0015]
An operation shaft body 24 is accommodated in the locking hole 12 in the vertical direction. The operation shaft body 24 includes a columnar operation head 24a and a small-diameter link rod 24b coupled to the lower portion thereof. A lower portion of the linkage rod portion 24b protrudes downward from the insertion hole 15 of the bottom plate 16, and an engagement claw piece 25 is screwed to the lower end thereof. The engaging claw piece 25 is provided with a locking position that engages with the engaging groove 5 of the lid receiving frame 1 and an unlocking position that does not engage with the engaging groove 5 by rotating the operation shaft body 24. It is designed to be rotated and converted.
[0016]
Further, a ridge 26 is provided between the lower surface of the operation head 24 a and the bottom plate 16 so as to urge the operation shaft body 24 upward. The ridge 26 is operated at the unlocking position of the engaging claw piece 25. An urging means for moving the shaft body 24 to an upper position within the locking hole 12 is used.
[0017]
Further, the operation head 24 a is provided with a guide mechanism that guides the operation of the operation shaft body 24. The guide mechanism includes a substantially inverted L-shaped cam groove 27 formed on the outer peripheral surface of the operation head 24 a and a guide pin 28 that protrudes into the locking hole 12 and is fitted into the cam groove 27. The cam groove 27 includes a short groove portion 27a in the vertical direction that holds the operation head 24a in a non-rotatable state at a predetermined height position at a locking position where the engagement claw piece 25 engages with the engagement groove 5, and the short groove portion 27a. A longitudinal groove 27b that allows the operation head 24a to move to an upper position at a position that is approximately 90 ° different from the groove 27a, and circumferential communication that communicates the upper end of the long groove 27b and the upper end of the short groove 27a. And a groove portion 27c. Note that the cam groove 27 and the guide pin 28 constituting the guide mechanism may be reversely arranged. That is, the cam groove 27 may be formed on the inner peripheral surface of the locking hole 12, and the guide pin 28 may be projected from the operation head 24a. In this case, the lower ends of the long groove portion 27b and the short groove portion 27a are communicated with each other through the communication groove portion 27c.
[0018]
In addition, an unlocking operation portion 29 having an appropriate shape is formed at the upper end of the operation head 24a, and an unlocking handle (not shown) formed separately according to the shape of the unlocking operation portion 29 is engaged. Thus, the operation shaft body 24 can be rotated.
[0019]
Next, the operation of the locking device having the above configuration will be described.
As shown in FIG. 1, in a state where the shielding lid 6 is locked, the guide pin 28 of the guide mechanism is positioned in the short groove portion 27 a of the cam groove 27, and the engaging claw piece 25 is engaged with the engaging groove 5 of the lid receiving frame 1. Is engaged. Here, the engaging claw piece 25 does not necessarily have to abut on the engaging surface 3 ′ above the engaging groove 5, and may be opposed to each other below. Thus, in this state, the shielding lid 6 cannot be lifted and is locked.
[0020]
In order to unlock the locking device in this state, first, a special key is inserted into the rotation operation groove 23 of the shielding cap 21 and rotated to remove the shielding cap 21. Next, when an unlocking handle is inserted into the locking hole 12 from above and engaged with the unlocking operation portion 29 and the operating head 24a is pushed downward against the urging of the ridge 26, the guide pin of the guide mechanism 28 relatively moves into the communication groove 27c of the cam groove 27, and the operation head 24a can be rotated. Then, when the operation head 24a is rotated by approximately 90 ° along the communication groove 27c, the engaging claw piece 25 fixed to the linkage flange 24b is integrally rotated to engage the lid receiving frame 1. It disengages from the joint groove 5 and moves to the unlocking position.
[0021]
Further, when the operation head 24a is rotated by approximately 90 ° in this way, the guide pin 28 moves relative to the upper end of the long groove portion 27b through the communication groove portion 27c and enters the long groove portion 27b. The operation head 24a can be moved upward. Since the operating shaft body 24 is urged upward by the ridge 26, the operating shaft body 24 is pushed up by the urging force of the ridge 26, and the guide pin 28 moves relatively to the lower end of the long groove portion 27b. Thus, as shown in FIG. 5, the upper end of the operation head 24 a is held at a position facing the vicinity of the opening of the locking hole 12.
[0022]
In this way, when the locking device is unlocked, the upper end of the operating head 24a is located in the vicinity of the opening of the locking hole 12, so that the operating head 24a can be visually recognized from the outside and above. Since it is possible to easily know that the locking device is in the unlocked state, it is possible to prevent subsequent forgetting of locking.
[0023]
Further, as described above, since the upper end of the operation head 24a is located in the vicinity of the opening of the locking hole 12, it is extremely difficult to attach the shielding cap 21, so that this is also in the unlocked state. It is possible to know this, and it is possible to prevent an operation error such as attaching the shielding cap 21 in the unlocked state.
[0024]
On the other hand, in order to lock the locking device, the unlocking handle is engaged with the operation head 24 a located in the vicinity of the opening of the locking hole 12, and the operation head 24 a is resisted against the urging of the ridge 26. When pushed downward and rotated by approximately 90 ° in the opposite direction, the engaging claw piece 25 is rotated integrally and engaged with the engaging groove 5 of the lid receiving frame 1 to be locked. Thereafter, the locking operation is completed by screwing and attaching the shielding cap 21 to the female screw 19 on the upper inner periphery of the locking hole 12.
[0025]
FIG. 6 shows another embodiment. In this embodiment, the mounting edge 3 of the lid receiving frame 1 is formed to be slightly thick, and the locking surface 3 ′ on the lower surface thereof is rotated to the locking position. The engaged claw piece 25 is brought into contact from below by the urging of the ridge 26. If the engaging claw piece 25 is configured to contact the locking surface 3 ′ in this way, the operation head 24a is held at a position below the locking hole 12 at the locking position, so that the cam groove 27 in the above embodiment is used. And the guide pin 28 are not required, and the operation head 24a can be rotated in either the left or right direction. Further, if a stopper 30 that contacts the lower portion of the locking hole 12 is provided at a predetermined position of the linkage rod 24b, the operation head 24a that moves to the upper position in the locking hole 12 at the unlocking position of the engaging claw piece 25 can be provided. It can be held at a predetermined height position.
[0026]
In the above-described embodiments, the shielding lid 6 configured as a color paving iron lid has been illustrated and described. However, the locking device according to the present invention may include other shielding lids, for example, an iron lid for a common wire groove. It can be applied to manhole iron covers, handhole iron covers, water supply iron covers, and the like. Further, the shielding cap 21 to be attached to the upper portion of the locking hole 12 may be attached by fitting a rubber shielding cap in place of the screw-type one as in the embodiment.
[0027]
【The invention's effect】
As described above, according to the present invention, the operating shaft body 24 for rotating the engaging claw piece 25 provided at the lower end between the locking position for engaging with the lid receiving frame 1 and the unlocking position for disengaging is provided with the shielding cover. 6 is housed in the vertical direction in the locking hole 12 provided on the side of the 6 and the operating shaft body 24 is moved to the upper position by the urging means in the locking hole 12 at the unlocking position of the engaging claw piece 25. Thus, in the unlocked state, the head of the operation shaft body 24 can be visually recognized from the outside and above. Thereby, it can be easily known that it is in an unlocked state, and forgetting to lock can be prevented.
[0028]
Further, the operating shaft body 24 moved to the upper position in the locking hole 12 at the unlocking position of the engaging claw piece 25 makes it impossible to attach the shielding cap 21 attached to the upper part of the locking hole 12. Then, since the shielding cap 21 cannot be attached in the unlocked state, it can be seen that it is in the unlocked state, and an operation error such as attaching the shielding cap 21 in the unlocked state can be prevented. Has an excellent effect.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a construction state of a locking device for a shielding lid according to the present invention.
FIG. 2 is a plan view of the above.
FIG. 3 is a perspective view of a locking device for a shielding lid according to the present invention.
FIG. 4 is an exploded perspective view of the above.
FIG. 5 is a side sectional view of the unlocked state in the construction state.
FIG. 6 is a side sectional view showing a construction state according to another embodiment.
FIG. 7 is a side sectional view showing a construction state of a locking device having a conventional configuration.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lid receiving frame 6 Shielding lid 12 Locking hole 21 Shielding cap 24 Operation shaft body 25 Engaging claw piece 26

Claims (1)

An operating shaft body with an engaging claw piece at the lower end is stored vertically in a locking hole provided on the side of the shielding lid mounted on the lid receiving frame, and the lower part protrudes downward from the locking hole for operation. The shaft claw engagement claw piece can be rotated and converted into a locked position that engages with the lid receiving frame and a unlocked position that does not engage by rotating the operation shaft body,
An urging means comprising a ridge for moving the operating shaft body to the upper position within the locking hole at the unlocking position of the engaging claw piece is provided,
In addition, the operating cap body that has been moved to the upper position in the locking hole at the unlocking position of the engaging claw piece has an unlocking operation groove that is attached to the upper part of the locking hole. A locking device for a shielding lid, characterized in that it can not be attached.

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