JPH09296469A - Locking device for shielding lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking device which prevents one from forgetting to lock. SOLUTION: A manipulating axial body 24 rotating a fixing claw 25 provided at the lower end and changing it over to either locking position where it is fitted to a cover receive frame 1 or unlocking position where it is unfitted therefrom, is vertically contained in a locking hole 12 provided near the side of a shield cover 6. The manipulating axial body 24 is constituted so as to vertically move by an urging means in the locking hole 12, at the unlocking position of the fixing claw 25. In the unlocking state, the head of the axial body can be watched from the upper side of the outside. In this way, the unlocked state can be easily confirmed and hence it prevents one from forgetting to lock.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for a shield lid which can prevent forgetting to lock.

[0002]

2. Description of the Related Art A mandrel, various inspection ports, a shielding lid for shielding a gutter, and the like are provided with a locking device for preventing unnecessary opening by a third person.

In a conventional locking device, as shown in FIG. 7, a detachable shield cap d is attached to an upper portion of a lock hole c provided on the side of a shield lid b mounted on a lid receiving frame a. Locking hole c
An operating shaft body f having an engaging claw piece e at its lower end is housed in the vertical direction, and a locking operation for engaging the engaging claw piece e with the lid receiving frame a by rotating the operating shaft body f. It is configured to be rotationally converted into a position and an unlocked position that does not engage.

[0004]

The locking and unlocking operations of this locking device are carried out by a dedicated handle with the shield cap d.
It is performed by removing the operation shaft f and rotating the operation shaft f approximately 90 ° in either forward or reverse directions. However, since the operation shaft f only rotates at the back position in the locking hole c, it cannot be unlocked. It is difficult to distinguish it from the locked state. For this reason, there is a problem that forgetting to lock is likely to occur, and a work error occurs in which the shielding cap d is attached in the unlocked state.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a locking device for a shielding lid which can solve the above-mentioned conventional problems.

[0006]

According to the present invention, there is provided an operating shaft body for rotationally converting an engaging claw piece provided at a lower end between a locking position for engaging a lid receiving frame and an unlocking position for not engaging the lid receiving frame. It is characterized in that it is provided with a biasing means that is housed vertically in a locking hole provided on the side of the shielding lid and that moves the operating shaft to an upper position in the locking hole at the unlocking position of the engaging claw piece. To do.

In this structure, a locking hole is provided near the side of the shielding lid mounted on the lid receiving frame, the operating shaft is housed in the locking hole in the vertical direction, and the lower portion of the operating shaft is locked in the locking hole. And a locking claw piece that is pivotally converted into a locking position that engages with the lid receiving frame and an unlocking position that does not engage with the rotation shaft of the operation shaft body at the lower end thereof. A preferred embodiment may be proposed in which a biasing means including a spring for moving the operating shaft to an upper position in the locking hole at the unlocked position of the engaging claw piece is provided.

Further, the operation shaft which 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 shield cap to the upper portion of the locking hole. Good.

In such a structure, when the engaging claw piece is in the unlocking position where it does not engage with the lid receiving frame, the operating shaft is moved to a position above the locking hole, so that the head of the operating shaft is moved. Can be visually recognized from above the outside. As a result, it is possible to easily know that it is in the unlocked state, and never forget to lock.

Further, if the operation shaft member moved to the upper position in the locking hole at the unlocking position of the engaging claw piece is made impossible to attach the shield cap attached to the upper portion of the locking hole. Since the shield cap cannot be attached, it can be seen that the cover is in the unlocked state, and it is possible to prevent a work error such as wearing the shield cap in the unlocked state.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In the drawings, reference numeral 1 denotes a lid receiving frame arranged on the upper side edge of a manhole, various inspection ports, side grooves x and the like. The lid receiving frame 1 includes a mounting edge 3 protruding inwardly from the side wall portion 2, and an engagement groove 5 is formed between a lower surface of the mounting edge 3 and the substrate portion 4. Further, the lower surface of the mounting edge 3 is used as a locking surface 3 '.

Reference numeral 6 denotes a manhole mounted on the lid receiving frame 1.
It is a shielding lid that shields various inspection ports and side grooves x. The illustrated shielding lid 6 is configured as a color paving iron lid, and is formed in a shallow-bottomed casing shape having a edging wall 8 on the periphery of the bottom wall 7, and the lid receiving frame 1 is provided inside thereof. The same pavement material 9 as the surrounding pavement material 9 can be filled. The shield lid 6 has a support projecting edge 10 formed on a lower surface side portion of a bottom wall 7 thereof mounted on the riding edge 3 and a lid receiving frame 1
I am trying to get on board.

On the side of the shield lid 6, a bottom wall 7 of the shield lid 6 is penetrated and a cylindrical body 11 is vertically arranged, and a lock hole 12 is provided therein. The cylindrical body 11 includes a fixing plate 13 fixed to the outer peripheral portion, a bolt 14a, and a nut 14
It is fixed by screwing to the bottom wall 7 by b,
A bottom plate 16 having an insertion hole 15 formed in the center thereof is fixed to the bottom portion thereof to form the locking hole 12 with a bottom. Also, the cylinder 1
A decorative plate 17 is fixed to the upper end portion of the cover 1 at a height position flush with the upper surface of the shielding lid 6, and a communication hole 18 is formed in the decorative plate 17 to communicate with the locking hole 12 at a concentric position. .

The locking hole 12 has a female screw 19 on the inner circumference of the upper portion.
The male screw portion 20 formed on the body portion is screwed onto the female screw 19, and the shielding cap 21 is detachably attached from above. The thickness of the head portion 22 of the shielding cap 21 is set to be substantially the same as that of the decorative plate 17, and in the attached state thereof, it is flush with the upper surface of the decorative plate 17 in the communication hole 18. In addition, the head 22 of the shielding cap 21
A rotary operation groove 23 is formed in the. The rotation operation groove 2
No. 3 has a groove shape that matches a special key shape, so that it cannot be rotated by a general tool such as a screwdriver.

An operating shaft 24 is housed in the locking hole 12 in the vertical direction. The operating shaft 24 is a cylindrical operating head 2
4a and a small-diameter linking rod portion 24b formed on the lower portion thereof. A lower portion of the linking rod portion 24b projects downward from the insertion hole 15 of the bottom plate 16, and an engaging claw piece 25 is screwed to a lower end thereof. The engaging claw piece 25 is engaged with the engaging groove 5 of the lid receiving frame 1 by rotating the operating shaft 24.
The lock position is engaged with and the unlock position is not engaged with the engagement groove 5.

Further, a spring 26 for urging the operating shaft 24 upward is interposed between the bottom surface of the operating head 24a and the bottom plate 16, and the spring 26 unlocks the engaging claw piece 25. It is a biasing means for moving the operating shaft 24 to the upper position in the locking hole 12 at the position.

Further, the operating shaft 2 is attached to the operating head 24a.
A guide mechanism for guiding the operation of No. 4 is provided. The guide mechanism is provided with a substantially inverted L-shaped cam groove 27 formed on the outer peripheral surface of the operation head portion 24a and a cam groove 2 which is provided so as to project into the locking hole 12.
7 and a guide pin 28 fitted in the guide pin 28. The cam groove 27
Is a vertical short groove portion 27a that holds the operation head 24a at a predetermined height position in a non-rotatable manner at the locking position where the engagement claw piece 25 engages with the engagement groove 5, and the short groove portion 27a is substantially the same. A vertically extending long groove portion 27b that allows the operating head 24a to move to an upper position at 90 ° different positions, and a circumferential communication groove portion 2 that connects the upper end of the long groove portion 27b and the upper end of the short groove portion 27a.
7c. The positions of the cam groove 27 and the guide pin 28 that constitute this guide mechanism may be reversed. 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 portion 24a. In this case, the lower ends of the long groove portion 27b and the short groove portion 27a are communicated with each other by the communication groove portion 27c.

An unlocking operation part 29 having an appropriate shape is formed on the upper end of the operation head 24a, and the unlocking operation part 29 is formed.
The operating shaft 24 can be rotated by engaging an unlocking handle (not shown) which is separately formed in conformity with the shape of FIG.

Next, the operation of the locking device having the above construction will be described. As shown in FIG. 1, when the shielding lid 6 is locked, the guide pin 28 of the guide mechanism moves the cam groove 27.
The engaging claw piece 25 is located in the short groove portion 27 a of the above and engages with the engaging groove 5 of the lid receiving frame 1. Here, the engaging claw piece 25 is
It is not always necessary to contact the upper engaging surface 3 ′ of the engaging groove 5, but it is sufficient that the engaging surface 5 ′ faces the lower surface. Therefore, in this state, the shielding lid 6 cannot be lifted and is in a locked state.

In this state, in order to unlock the locking device, first, the dedicated key is inserted into the rotation operation groove 23 of the shielding cap 21 and rotated to remove the shielding cap 21.
Next, when the unlocking handle is inserted into the locking hole 12 from above, the unlocking operating portion 29 is engaged with the operating head 24a and the operating head 24a is pushed downward against the urging of the spring 26, the guide pin of the guide mechanism is pushed. Two
8 relatively moves into the communication groove portion 27c of the cam groove 27, and the operation head 24a can be rotated. Then, the operation head portion 24a is moved along the communication groove portion 27c by approximately 9
When it is rotated by 0 °, the engaging claw piece 25 fixed to the linking rod portion 24b integrally rotates and disengages from the engaging groove 5 of the lid receiving frame 1, and moves to the unlock position.

Further, in this way, the operation head 24a is approximately 90
When rotated, the guide pin 28 relatively moves to the upper end of the long groove portion 27b through the communication groove portion 27c and enters the long groove portion 27b, and the operation head 24a can move upward. It will be in a state. Since the operating shaft 24 is biased upward by the spring 26, the operating shaft 24 is pushed up by the biasing force of the spring 26, and the guide pin 28 relatively moves to the lower end of the long groove portion 27b. Thus, as shown in FIG. 5, the upper end of the operating head 24a is held at a position facing the opening vicinity of the locking hole 12.

As described above, when the locking device is unlocked, since the upper end of the operating head 24a is located in the vicinity of the opening of the locking hole 12, the operating head 24a is closed.
Since "a" can be visually recognized from above the outside and it can be easily known that the locking device is in the unlocked state, it is possible to prevent forgetting to lock it thereafter.

Further, as described above, since the upper end of the operation head portion 24a is located in the vicinity of the opening of the locking hole 12, it is extremely difficult to attach the shield cap 21, and this also causes the unlocking. In addition to being able to know that it is in the unlocked state, the shielding cap 21 remains unlocked.
It is possible to prevent work mistakes such as wearing the.

On the other hand, to lock the locking device, the locking hole 1
The unlocking handle is engaged with the operation head 24a located in the vicinity of the opening of No. 2, and the operation head 24a is pushed downward against the urging force of the spring 26, so that the operation head 24a is moved in the opposite direction to about 90 degrees. When it is rotated, the engaging claw piece 25 is integrally rotated and the lid receiving frame 1 is rotated.
It is engaged with the engaging groove 5 and is locked. After that, the locking work is completed by screwing and attaching the shielding cap 21 to the female screw 19 on the upper inner circumference of the locking hole 12.

FIG. 6 shows another embodiment. In this embodiment, the mounting edge 3 of the lid receiving frame 1 is formed to be slightly thicker,
The engaging claw piece 25 rotated to the locking position is brought into contact with the engaging surface 3'of the lower surface from below by the urging of the spring 26. When the engaging claw piece 25 is configured to abut the locking surface 3'in this way, the operating head 24a is held below the locking hole 12 at the locking position, so that the cam groove 27 in the above embodiment is used. The guide mechanism including the guide pin 28 and the guide pin 28 is not necessary, and the operation head 24a can be rotated in either left or right direction. In addition, the linkage rod 24
If a stopper 30 that abuts the lower portion of the locking hole 12 is provided at a predetermined position of b, the locking hole 12 is released at the unlocked position of the engaging claw piece 25.
The operating head 24a that moves to the upper position inside can be held at a predetermined height position.

Although the shielding lid 6 configured as an iron lid for color paving is illustrated in the above-mentioned embodiments, the locking device according to the present invention can be used with other shielding lids, for example, wire joint grooves. It can be applied to iron cover for manhole, iron cover for manhole, iron cover for handhole, iron cover for water supply, etc. Further, the shielding cap 21 attached to the upper portion of the locking hole 12 may be a rubber-made shielding cap to be attached by fitting instead of the screwing type as in the embodiment.

[0027]

As described above, according to the present invention, the operating shaft body for converting the engaging claw piece 25 provided at the lower end into a locking position where the lid receiving frame 1 is engaged and an unlocking position where the lid receiving frame 1 is not engaged. 24 is vertically housed in a locking hole 12 provided near the side of the shielding lid 6, and the operating shaft 24 is locked at the unlocking position of the engaging claw piece 25.
Since the urging means is used to move the head to the upper position, the head of the operating shaft 24 can be visually recognized from above the outside in the unlocked state. As a result, it is possible to easily know that it is in the unlocked state and prevent forgetting to lock.

The locking hole 1 is located at the unlocked position of the engaging claw piece 25.
By disabling the attachment of the shield cap 21 that is attached to the upper part of the locking hole 12 by the operation shaft 24 that has moved to the upper position in 2, the attachment of the shield cap 21 in the unlocked state is possible. Since it is not possible, it is possible to know that it is in the unlocked state, and it is possible to prevent a work error such as wearing the shielding cap 21 in the unlocked state, which is an excellent effect.

[Brief description of 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 same.

FIG. 3 is a transparent perspective view of the locking device of the shielding lid according to the present invention.

FIG. 4 is an exploded perspective view showing the same as above.

FIG. 5 is a side sectional view of the unlocked state in the construction state of the above.

FIG. 6 is a side sectional view showing a construction state of another embodiment.

FIG. 7 is a side cross-sectional view showing a construction state of a conventional locking device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lid receiving frame 6 Shielding lid 12 Locking hole 21 Shielding cap 24 Operating shaft 25 Engaging claw piece 26 Spring

Claims (3)

[Claims] 1. An operating shaft body for rotating and converting an engaging claw piece provided at a lower end between a locking position where a lid receiving frame is engaged and an unlocking position where the lid receiving frame is not engaged is provided near a side of a shielding lid. A locking device for a shield lid, which is vertically housed in a locking hole and is provided with a biasing means for moving the operating shaft to an upper position in the locking hole when the engaging claw piece is unlocked. 2. A locking hole is provided near the side of a shielding lid mounted on the lid receiving frame, and the operating shaft is housed in the locking hole in the vertical direction, and the lower part of the operating shaft is projected downward from the locking hole. The lower end of the engaging claw is provided with an engaging claw piece that is rotationally converted into a locking position that engages with the lid receiving frame and an unlocked position that does not engage with it by the rotating operation of the operating shaft. 2. The locking device for the shield lid according to claim 1, further comprising a biasing means including a spring for moving the operating shaft to an upper position in the locking hole at an unlocking position of the piece. 3. An operation shaft body which is moved to an upper position in the locking hole at an unlocking position of the engaging claw piece, so that the shield cap to be attached to the upper portion of the locking hole cannot be attached. The locking device for the shielding lid according to claim 1, characterized in that.