Lock device of opening lid of underground structure

Abstract

To provide a locking device capable of preventing forgetting to lock an opening lid of an underground structure after closing an opening.SOLUTION: A lock device 1 comprises an outer cylinder 2, an inner cylinder 3, an operating shaft 4, a latch member 5, and a cylinder lock 6. After the cylinder lock 6 is unlocked and removed from the inner cylinder 3, the operating shaft 4 is rotated together with the inner cylinder 3 and the latch member 5 by the opening / closing operating rod 103 to the locked position or the unlocked position. When the cylinder lock 6 is locked or unlocked by using a key 8, a deadbolt 61 is extended or retracted toward an outer peripheral side. When the latch member 5 is in the locked position, the inner cylinder 3 is capable of being locked with an engagement opening 32a facing the deadbolt 61. When the latch member 5 is in the unlocked position, the engagement opening 32a does not face the deadbolt 61 and locking is disabled, to prevent a lid 102 from being forgotten to be locked.SELECTED DRAWING: Figure 1(a)

Description

Technical Field

[0001] The present invention relates to a lock device for a lid for opening and closing an opening of an underground structure.

Background Art

[0002] Conventionally, a generally known lock device for a manhole cover performs locking and unlocking operations by rotating a pivot of a latch that engages with and disengages from a receiving frame of the manhole using an operating rod with a special tip shape. Also, there are some that have a double locking structure in which the insertion part of the operating rod is closed with a cylindrical cylinder lock, and by locking this, it becomes impossible to remove the cylinder lock itself from the insertion part, making it impossible to insert the operating rod. In this case, only a person authorized to have both the special operating rod and the key for the cylinder lock can open and close the lid. Furthermore, a proposal has been made to prevent the cylinder lock from being locked while the latch is in the unlocked state, so that the cylinder lock cannot be dropped into the insertion part of the operating rod in the unlocked state (for example, Patent Document 1). According to this, forgetting to lock is avoided due to the inability to lock.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a lock device for a lid for an opening of an underground structure, which has a simple structure different from the above - mentioned conventional lock device and can avoid forgetting to lock by making it impossible to lock in the unlocked state.

Means for Solving the Problems

[0005] In the following description, reference is made to the reference numerals in the accompanying drawings, but the present invention is not limited thereto. To solve the above problems, the lock device 1 of the present invention includes an outer cylinder 2 that penetrates through the lid 102 and is fixed to the lid 102, an inner cylinder 3 that is axially fixed and rotatably inserted into the outer cylinder 2, a head portion 41 and a shaft portion 42, and the shaft portion 42 is inserted into the inner cylinder 3 through the inner cylinder 3 and the outer cylinder 2. An operating shaft 4 that is rotatable within the outer cylinder 2 integrally with the inner cylinder 3, a latch member 5 that is fixed to the shaft portion 42 of the operating shaft 4 below the outer cylinder 2 and is rotatable integrally with the operating shaft 4 and the inner cylinder 3 between a locked position and an unlocked position, and a cylinder lock 6 that is located above the head portion 41 of the operating shaft 4 and is relatively rotatable within the inner cylinder 3 and is rotationally stopped and fitted into the outer cylinder 2. The latch member 5 engages with the receiving frame 101 in the locked position and disengages from the receiving frame 101 in the unlocked position. The operating shaft 4 has an engaging portion 41a at the head portion 41 that engages with a specific-shaped tip of an opening / closing operating rod 103 inserted into the inner cylinder 3 from which the cylinder lock 6 has been removed. The cylinder lock 6 projects and retracts a deadbolt 61 to the outer peripheral side by a locking and unlocking operation with a key 8. The inner cylinder 3 has an engaging opening 32a that faces the deadbolt 61 at a predetermined relative rotational angle position with respect to the cylinder lock 6. The inner cylinder 3 is arranged so that the engaging opening 32a faces the deadbolt 61 only when the latch member 5 is in the locked position, enabling locking, and forgetting to lock the lid 102 is avoided due to the inability to lock.

Advantages of the Invention

[0006] According to the present invention, it is possible to surely avoid forgetting to lock the lid due to the inability to lock the cylinder lock in the unlocked state of the latch member.

Brief Description of the Drawings

[0007]

Figure 1(a)

Figure 1(b)

Figure 1(c)

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0008] Embodiments of the present invention will be described with reference to the drawings. The locking device 1 of the present invention is a device for locking the receiving frame 101 of an opening so that unauthorized persons cannot open or close the lid 102 of an opening, such as an opening of an underground structure like a utility tunnel that collectively houses lifelines such as water supply and drainage, gas, telephone, and power lines.

[0009] The locking device 1 includes an outer cylinder 2 that penetrates the lid 102 and is fixed to the lid 102, an inner cylinder 3 inserted into the outer cylinder 2, an operating shaft 4 inserted into the inner cylinder 3 so as to penetrate the inner cylinder 3 and the outer cylinder 2 vertically, a latch member 5 fixed to the operating shaft 4 below the outer cylinder 2, and a cylinder lock 6 fitted into the inner cylinder 3 above the operating shaft 4.

[0010] The outer cylinder 2 has an insertion hole 21a at the center of the bottom 21 for rotatably penetrating the operating shaft 4 around the axis, and penetrates the lid 102 vertically and is fixed to the lid 102.

[0011] The inner cylinder 3 is inserted rotatably around the axis inside the outer cylinder 2 and is prevented from coming off by a retaining ring 7 fixed to the upper inner circumference of the outer cylinder 2. The inner cylinder 3 is provided with an oblong hole 31a having two parallel planes that penetrate the center of the bottom 31 without being able to rotate around the axis, and an engaging opening 32a in the cylindrical portion 32.

[0012] The operating shaft 4 has a head 41 and a shaft portion 42. The head 41 is placed on the bottom 31 of the inner cylinder 3 and inserted into the inner cylinder 3. The shaft portion 42 penetrates the inner cylinder 3 and the outer cylinder 2 vertically through the oblong hole 31a and the insertion hole 21a. The shaft portion 42 has a cross-sectional shape with two parallel planes similar to the oblong hole 31a of the inner cylinder 3 and rotates integrally with the inner cylinder 3 around the axis and rotates relative to the outer cylinder 2. The head 41 is provided with an engaging portion 41a having a special shape that opens upward. An engaging portion 103a at the tip of an operating rod 103 for rotating the operating shaft 4 engages with the engaging portion 41a.

[0013] The latch member 5 is fixed to the shaft portion 42 of the operating shaft 4 below the outer cylinder 1 and is rotatable integrally with the operating shaft 3 and the inner cylinder 3 between a locked position and an unlocked position within a range of a rotation angle of 90° restricted by the stopper portion 102a of the lid 102. The latch member 5 engages with the inner flange 101a of the receiving frame 101 at the locked position to prevent the lid 102 from opening, and disengages from the inner flange 101a at the unlocked position to allow the lid 102 to open.

[0014] The cylinder lock 6 is cylindrical with an outer diameter substantially the same as the inner diameter thereof, is positioned above the head 41 of the operating shaft 4, and is fitted into the inner cylinder 3. The cylinder lock 6 projects the dead bolt 61 to the outer peripheral side at the locked position and retracts the dead bolt 61 at the unlocked position by the locking and unlocking operation with the key 8. Therefore, the cylinder lock is fitted into the inner cylinder in the unlocked state. Note that the key 8 is prevented from coming off with respect to the cylinder lock 6 at the unlocked position and can be removed from the inner cylinder 3 together with the cylinder lock 6. The cylinder lock 6 is provided with a positioning projection 6a on the outer periphery of the upper portion, engages this with the positioning recess 7a of the retaining ring 7, and has a predetermined relative rotational angle position with respect to the operating shaft 4 and the inner cylinder 3, that is, when the latch member 5, the operating shaft 4, and the inner cylinder 3 are in the locked position, the dead bolt 61 faces the engagement opening 32a, and it is prevented from rotating with respect to the outer cylinder 1. Therefore, the cylinder lock 6 can be locked only when the latch member 5 is in the locked position, that is, when the dead bolt 61 faces the engagement opening 32a, inside the inner cylinder 3. When the latch member 5 is in the unlocked position, the dead bolt 61 abuts against the inner periphery of the inner cylinder 3, so the locking operation cannot be performed. The operator can notice that the lid 102 has been forgotten to be locked due to the inability to lock.

[0015] A magnet cap 9 is fitted onto the retaining ring 7 inside the upper end portion of the outer cylinder 2, and a rubber cap 10 for preventing the intrusion of mud and sand is further mounted above it.

[0016] The procedure for opening and closing the lid 102 will be described. As shown in FIG. 1, when the latch member 5 is in the locked position and the cylinder lock 6 is in the locked state, even if the rubber cap 10 and the magnet cap 9 are removed, the cylinder lock 6 cannot be pulled out from the inner cylinder 3, and the rotation operation of the operating shaft 4 is impossible.

[0017] From this state, after sequentially removing the rubber cap 10 and the magnet cap 9, as shown in FIG. 2, when the key 8 held by the authorized person for opening and closing is inserted into the cylinder lock 6 and the unlocking operation is performed, the dead bolt 61 is immersed and disengages from the engaging opening 32a of the inner cylinder 3. Therefore, as shown in FIG. 3, the cylinder lock 6 can be pulled out from the inner cylinder 3 together with the key 8. When the cylinder lock 6 is pulled out from the inner cylinder 3, the head 41 of the operating shaft 4 is exposed inside the inner cylinder 3.

[0018] Next, as shown in FIG. 4, when the operating rod 103 held by the authorized person for opening and closing is inserted into the inner cylinder 3 and the engaging portion 103a at the tip is engaged with the engaging portion 41a of the operating shaft 4 and rotated 90° to the left, the latch member 5 rotates together with the inner cylinder 3 and is arranged at the unlocked position. Thus, the operator can open the lid 102 and enter the underground structure.

[0019] When the work inside the underground structure is completed and the operator escapes from there, if the lid 102 is closed and the latch member 5 is returned to the locked position using the operating rod 103, the state shown in FIG. 3 is obtained. In this state, together with the key 8, the cylinder lock 7 is inserted into the inner cylinder 3 and the locking operation is performed, and the dead bolt 61 engages with the engaging opening 32a of the inner cylinder 3. If the key 8 is removed from the cylinder lock 7, the cylinder lock 6 cannot be removed from the inner cylinder 3.

[0020] However, if the operator forgets to return the latch member 5 to the locked position after closing the lid 102 and inserts the cylinder lock 7 into the inner cylinder 3, since the engaging opening 32a of the inner cylinder 3 does not face the dead bolt 6, even if an attempt is made to perform the locking operation using the key 8, the dead bolt 61 abuts against the inner circumference of the inner cylinder 3 and the locking cannot be performed. As a result, the operator will notice the locking omission, and the locking operation using the operating rod 103 is prompted.

[0021] There are several types of commercially available cylinder locks 6 having the same outer diameter dimension but different arrangements and shapes of the dead bolts 61. Therefore, a plurality of engaging openings 32a having different positions and shapes can be formed in the inner cylinder 3 so as to be compatible with a plurality of types of cylinder locks 6.

[0022] In Fig. 6, the bottom 31 of the inner cylinder 3 and the head 41 of the operating shaft 4 are integrally formed, and the shaft portion 42 of the operating shaft 4 rotatably penetrates the outer cylinder 2 from the bottom 31 of the inner cylinder 3 and extends downward.

[0023] The engaging portion 41a of the operating shaft 4 is formed on the bottom 31 inside the inner cylinder 3. In addition, the same reference numerals are given to the components equivalent to those in the previous embodiment, and the description thereof is omitted.

Explanation of Reference Numerals

[0024] 1 Locking device 2 Outer cylinder 21 Bottom 21a Insertion hole 3 Inner cylinder 31 Bottom 31a Oval long hole 32 Cylindrical portion 32a Engagement opening 4 Operating shaft 41 Head 41a Engaging portion 42 Shaft portion 5 Hanging member 6 Cylinder lock 61 Deadbolt 7 Retaining ring 8 Key 9 Magnet cap 10 Rubber cap 101 Receiving frame 102 Lid 102a Rib

Claims

1. A lock device for a lid that is attachably and detachably mounted on a receiving frame of an opening of an underground structure, an outer cylinder that penetrates the lid and is fixed to the lid, an inner cylinder that is inserted into the outer cylinder in an axially fixed and rotatable manner around the axis, having a head and a shaft portion, the shaft portion is inserted into the inner cylinder through the inner cylinder and the outer cylinder, and the operation shaft that is rotatable in the outer cylinder integrally with the inner cylinder, a latch member that is fixed to the shaft portion of the operation shaft below the outer cylinder, is rotatable integrally with the operation shaft and the inner cylinder between a locked position and an unlocked position, engages with the receiving frame at the locked position, and disengages from the receiving frame at the unlocked position, a cylinder lock that is located above the head of the operation shaft, is relatively rotatable in the inner cylinder and is prevented from rotating with respect to the outer cylinder and is inserted therein, and the deadbolt is projected and retracted to the outer peripheral side by a key unlocking and locking operation, the head of the operation shaft has an engaging portion that engages with a tip of a special-shaped opening and closing operation rod inserted into the inner cylinder from which the cylinder lock is removed, the inner cylinder has an engaging opening that faces the deadbolt of the cylinder lock at a predetermined relative rotation angle position with respect to the cylinder lock, the inner cylinder is arranged so that the engaging opening faces the deadbolt only when the latch member is in the locked position, enabling locking, Thereby, a lock device for a lid of an opening of an underground structure, characterized in that it is configured to prevent forgetting to lock the lid.

2. The bottom of the inner cylinder and the head of the operation shaft are integrally formed, the shaft portion of the operation shaft rotatably penetrates the outer cylinder from the bottom of the inner cylinder and extends downward, and the engaging portion of the operation shaft is formed at the bottom in the inner cylinder. The lock device for a lid of an opening of an underground structure according to claim 1.

3. The locking device for the opening lid of the underground structure according to claim 1 or 2, characterized in that a plurality of the engagement openings of the inner cylinder are provided so as to also correspond to dead bolts of a plurality of other types of cylinder locks fitted into the inner cylinder.

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