JP2004044290A - Lock device for manhole cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock device for a manhole cover capable of withstanding the poor using surroundings to be exposed with rainwater and muddy water and remarkably improved in a security function thereof by using two stages of lock units above and below. <P>SOLUTION: This lock device for a manhole cover is formed of a first lock unit installed in a cover to lock the cover with a fixed receiver frame of the manhole at a closing position and a second lock unit inserted into a passage part of a first lock unit operating key formed in the cover and restricted impossible to be drawn from the cover. After drawing the second lock unit by using a second lock unit operating key, the first lock unit operating key is used to release the lock of the cover with the fixed receiver frame. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device used for a manhole cover such as a communication cable, a power transmission cable, a common groove for accommodating a water supply and a sewer pipe, and the like.
[0002]
2. Description of the Related Art A conventional locking device that locks a manhole cover in a closed position so that the manhole cover cannot be opened with respect to a fixed receiving frame includes an outer cylinder penetrating the lid in a vertical direction and rotatably housed in the outer cylinder. A locking shaft fixed to a lower end portion of the locking shaft and engaging with a metal receiving portion on a fixed receiving frame side; and a key receiving recess formed at an upper end portion of the locking shaft in the operation key. (See Japanese Patent No. 3291269).
[0003]
In this locking device for a manhole cover, in order to prevent the key receiving portion of the locking shaft from being clogged by muddy water and making it difficult or impossible to insert the key, the shape of the key receiving portion is, for example, substantially triangular. It is formed in a simplified shape.
Because of this special use environment, the security of the lock function is inferior, and it is not impossible to rotate the lock shaft by forcibly inserting tools other than the original key. Was.
[0004]
In a situation where there is a fear that militants will attack the communication system in recent years, it is necessary to prevent terrorists from entering manholes into communal trenches or the like and performing destructive operations such as cutting cables. Therefore, the security function of the locking device for the manhole cover is also required to be enhanced.
Accordingly, an object of the present invention is to provide a locking device for a manhole cover, which can withstand a poor use environment exposed to rainwater or muddy water and uses a lock unit in an upper and lower two-stage position, thereby greatly enhancing the security function. To provide.
[0005]
According to the first aspect of the present invention, there is provided a locking device for a manhole cover, wherein the locking device is provided on a cover side, and the cover is locked in a closed position with respect to a fixed receiving frame of the manhole. A first lock unit which is inserted into a passage portion of the operation key of the first lock unit formed on the lid side and which is restrained so as to be unremovable with respect to the lid, the second lock unit. After the second lock unit is removed by using the operation key of (1), the locking of the lid with respect to the fixed receiving frame is released by using the operation key of the first lock unit.
[0006]
In the locking device for a manhole cover according to the second aspect of the present invention, in addition to the configuration according to the first aspect of the present invention, the first lock unit includes an outer cylinder penetrating the lid in a vertical direction, and a lower half of the outer cylinder. A locking shaft rotatably housed in the locking portion, and a stopper plate fixed to the lower end portion of the locking shaft and engaged with the metal receiving portion on the fixed receiving frame side. A key code portion to be inserted into a key receiving portion formed at an upper end portion of the locking shaft is formed at a distal end portion,
The second lock unit has an inner cylinder inserted into the upper half of the outer cylinder, and is accommodated in the inner cylinder so as to be non-rotatable and vertically movable, and has a non-circular receiving hole formed at the center. A locking plate, a spring member for urging the locking plate in an ascending direction, a rotor having a lower end inserted into a vertical shaft hole of a lower guide portion of the inner cylinder, and a lateral direction of the guide portion. A lock bolt movably inserted into the guide hole, and a rotation stop portion that disables rotation of the rotor when engaged with a receiving hole of the locking plate, and a rotatable portion on the upper portion of the rotor; The operation key of the second lock unit has a driving portion for receiving the rotation restricting portion of the rotor formed at the front end, and the operation key of the second lock unit is formed by using the operation key. Lock bolt driven by the rotor when the rotor is turned by a predetermined angle It is intended to leave the socket member of the lid side.
[0007]
In the locking device for a manhole cover according to a third aspect of the present invention, in addition to the configuration of the second aspect of the present invention, the operating key of the second lock unit is rotated until the lock bolt is disengaged from the metal receiving portion on the lid side. Then, the key code portion of the operation key engages with a key code portion provided on the inner surface of the inner cylinder so that the operation key cannot be removed from the inner cylinder.
[0008]
In the locking device for a manhole cover according to the first aspect of the present invention, the operation of each of the first lock unit and the second lock unit is performed by a legitimate manager of the manhole for work such as repair and replacement of the communication cable and inspection. The worker who has been given the operation key first inserts the operation key into the second lock unit arranged on the upper side. After the second lock unit is released from the lid by the operation key, the second lock unit is removed from the passage portion of the operation key of the first lock unit.
[0009]
The operation key of the first lock unit is inserted from the passage portion which has been thus blocked by the second lock unit, and the locking of the lid to the fixed receiving frame of the manhole is released using the operation key. Thereafter, the lid is opened, and the worker enters the common groove or the like from the manhole, and starts a predetermined operation.
[0010]
After completing the required work, the worker goes out of the manhole onto the road and closes the lid. First, the lid is locked to the fixed receiving frame of the manhole by the first lock unit using the operation key of the first lock unit. Next, after extracting the operation key of the first lock unit, the second lock unit is inserted into the passage portion of the operation key of the first lock unit, and the second lock unit is covered with the operation key of the second lock unit. And the passage portion is closed. Finally, the operation key of the second lock unit is removed from the second lock unit, and the worker leaves the site.
[0011]
In the locking device for a manhole cover according to the second aspect of the present invention, the operation key is first inserted into the second lock unit disposed on the upper side, and the drive unit at the tip of the operation key is stopped from rotating the rotor. Fit the part. The locking plate is pressed down by the driving portion of the operating key against the bias of the spring member. When the locking plate moves down the inside of the inner cylinder along the axis of the rotor and the engaging portion between the non-circular receiving hole of the locking plate and the rotor shifts from the rotation restricting portion to the rotation allowing portion. The rotation constraint of the rotor on the inner cylinder is released.
[0012]
At this stage, when the operation key of the second lock unit is turned by a predetermined angle, the rotor integrally rotates around the shaft hole of the lower guide portion of the inner cylinder, and the lock bolt provided in conjunction with the rotor is rotated. The guide hole of the lower guide portion draws and drives the lower guide portion side, and the tip end of the lock bolt is separated from the metal receiving portion on the lid side.
This releases the restraint of the second lock unit from the lid, so that the second lock unit is removed from the passage portion of the operation key of the first lock unit.
[0013]
The operation key of the first lock unit is inserted from the passage portion which has been released from the blockage by the second lock unit, and the key code portion at the tip of the operation key is inserted into the key receiving portion at the upper end of the lock shaft. insert. Then, by turning the operation key, the lock shaft is rotated by a predetermined angle about the axis of the outer cylinder, and the stopper plate at the lower end of the lock shaft is detached from the metal receiving portion on the fixed receiving frame side. Thereafter, the lid is opened, and the worker enters the common groove or the like from the manhole, and starts a predetermined operation.
[0014]
After completing the required work, the worker goes out of the manhole onto the road and closes the lid. Next, the operation key of the first lock unit is turned to engage the stopper plate with the receiving portion on the fixed receiving frame side, and the lid is locked to the fixed receiving frame of the manhole.
After extracting the operation key of the first lock unit, the second lock unit is inserted into the passage portion of the operation key of the first lock unit, and the rotor is turned by the operation key of the second lock unit, and the lock bolt Is driven to engage with the receiving part on the lid side.
In this way, the second lock unit is restrained from being pulled out with respect to the lid, and after closing the passage, the operation key of the second lock unit is pulled out, and the worker leaves the site.
[0015]
In the locking device for a manhole cover according to the third aspect of the present invention, in the operation of the second aspect of the present invention, when the operation key of the second lock unit is turned to a position where the lock bolt is detached from the receiving portion on the lid side. Since the key code portion of the operation key engages with the key code portion on the inner cylinder side, the operation key cannot be removed from the inner cylinder.
Therefore, when the operation key of the second lock unit is pulled toward the user, the second lock unit is also pulled together, and the second lock unit is moved out of the first lock unit only by the operation of pulling the operation key. It will be removed from the tube.
[0016]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment of the present invention, a first lock unit 1 is rotatably housed in an outer cylinder 3 penetrating a lid 2 in a vertical direction and a lower half of the outer cylinder 3. A lock shaft 4 and a stopper plate 7 fixed to the lower end of the lock shaft 4 and engaged with a metal receiving portion 6 formed on the inner surface of the fixed receiving frame 5 for operating the first lock unit 1. The key 8 has a key code portion 10 formed at a tip end thereof, which is inserted into a key receiving portion 9 formed at an upper end portion of the locking shaft 4.
The key code 10 of the operation key 8 fixed to the tip of the T-shaped handle portion is constituted by a substantially triangular projection with rounded corners, and the key receiving portion 9 of the locking shaft 4 corresponding to this. Is constituted by a substantially triangular concave portion. The large-diameter shaft portion 4a of the locking shaft 4 is rotatably fitted to the outer cylinder 3. The small-diameter shaft portion 4b of the locking shaft 4 is rotatably inserted into a central hole 12 of a bottom cover member 11 fixed to the outer cylinder 3, and a stopper plate 7 is fitted into the distal end portion of the small-diameter shaft portion 4b so as to be relatively non-rotatable. It is fixed to the lock shaft 4 by a nut 13 screwed to the tip.
[0017]
A depression 15 is formed on the upper surface of the lid 2 around the insertion hole 14 of the outer cylinder 3, and a fixing ring plate 16 is fitted and fixed to the upper end of the outer cylinder 3, and is fixed. The ring plate 16 is in contact with the bottom of the depression 15. A washer member 17 formed so as to enclose the lower half of the outer cylinder 3 is abutted against the lower surface of the lid 2, and the nut 13 is tightened via the stopper plate 7 and the washer member 17, whereby the outer cylinder 3 is moved. It is fixed to the lid 2.
[0018]
Stoppers 17b and 17c are provided upward on the lower wall 17a of the washer member 17. The outer cylinder 3 is prevented from rotating with respect to the lid 2 by the lower parallel wall portion 11a of the bottom lid member 11 engaging with the stopper portions 17b and 17c.
The upper end opening of the outer cylinder 3 is covered with a short cylindrical cap 18 made of a magnetic metal such as iron to prevent rainwater or muddy water from entering the outer cylinder 3. The cap 18 is removed by pinching it with a fingertip of an operator, but it can also be removed by, for example, attracting a permanent magnet attached to a handle portion of the operation key.
A rubber cover 19 surrounding the cap 18 is adapted to be fitted into the upper opening 20 of the depression 15, so that the waterproofing measures are thoroughly taken.
[0019]
The second lock unit 21 is inserted into the upper half of the outer cylinder 3 of the first lock unit 1, and the inner cylinder 22 containing the mechanical part of the second lock unit 21 is located immediately below the locking shaft 4. Placed on top. A single vertical groove 23 is formed in the outer peripheral surface of the inner cylinder 22 in the axial direction, and the regulating member 24 fixed to the inner surface of the upper end portion of the outer cylinder 3 engages with the vertical groove 23 to form the second groove. While the lock unit 21 is prevented from rotating relative to the outer cylinder 3, the lock unit 21 is pulled out of the outer cylinder 3 under the guide action of the vertical groove 23 and the regulating member 24.
[0020]
A locking groove 26 is formed in the inner surface of the inner cylinder 22 in the axial direction. The locking plate 25 is prevented from rotating relative to the inner cylinder 22 by engaging the outer peripheral projection 27 with the locking groove 26. On the other hand, it moves in the up-down direction under the guidance of the restraining groove 26 and the outer peripheral projection 27. The lower end of the inner cylinder 22 is closed by a lower guide 28, and the lower guide 28 is fixed to the inner cylinder 22.
[0021]
The rotor 30 rotatably inserted into the vertical shaft hole 29 of the lower guide portion 28 is prevented from being pulled out of the lower guide portion 28 by the retaining pin 32 whose tip is inserted into the lower annular groove 31. ing. The lock bolt 34 inserted into the lateral guide hole 33 of the lower guide portion 28 is urged in a protruding direction by a spring member 35 such as a compression coil spring. , And engages with a metal receiving portion 37 having a semicircular cross section formed on the lower surface of the lid 2.
[0022]
A drive cam projection 38 is projected from the lower surface of the rotor 30 at an eccentric position, and the drive cam projection 38 is inserted into an upper surface of an inner half portion 34 a of the lock bolt 34 housed in the lower guide portion 28. The passive cam groove 39 is formed in the transverse direction. When the rotor 30 is rotated, the drive cam projection 38 pushes the inner surface of the passive cam groove 39, so that the lock bolt 34 is moved forward and backward, and the lock bolt 34 is disengaged from the metal receiving portion 37 on the lid 2 side.
[0023]
The non-circular receiving hole 40 formed at the center of the locking plate 25 is obtained by replacing one corner of a regular hexagon with an arc, and crossing a rotation stopping portion 41 formed at the upper end of the rotor 30. The surface shape is the same as the regular hexagon except that one corner is replaced by an arc. The rotation permitting portion 42 formed below the rotation stopping portion 41 has a circular cross section inscribed in the receiving hole 40. The operation key 43 of the second lock unit 21 has a drive unit 44 fixed to the tip of a T-shaped handle. The cross section of the drive unit 44 that receives the rotation stopping unit 41 of the rotor 30 has the shape described above. Similarly, one corner of the regular hexagon is replaced with an arc.
[0024]
The spring member 45 for urging the locking plate 25 in the ascending direction is constituted by a compression coil spring, and is inserted between the upper surface of the lower guide portion 28 and the lower surface of the locking plate 25. The driving part 44 of the operation key 43 is fitted into the rotation stopping part 41 of the rotor 30 that partially protrudes from the receiving hole 40, and the lower surface of the driving part 44 is the upper surface of the locking plate 25 around the receiving hole 40. Abut the part.
When the operation key 43 is pressed, the fitting amount between the drive unit 44 and the rotation stopping unit 41 increases, and the locking plate 25 is pushed down.
[0025]
When the locking plate 25 is pushed down to a predetermined stage, the receiving hole 40 separates from the rotation stopping portion 41 and engages with the rotation permitting portion 42. Thereafter, when the operation key 43 is rotated in a predetermined direction, the operation key 43 and the rotor 40 rotate integrally, and the lock bolt 34 is caused to move in and out as described above.
[0026]
When the operation key 43 of the second lock unit 21 is turned to a position where the lock bolt 34 is disengaged from the metal receiving part 37 on the lid 2 side, the key code part 46 of the operation key 43 becomes the key code part 47 of the inner cylinder 22. To prevent the operation key 43 from being removed from the inner cylinder 22. The key code portion 46 on the operation key 43 side is formed of an annular projection formed on the outer peripheral portion above the driving portion 44, and the key code portion 47 on the inner cylinder 22 side is It is composed of a projection plate which is fitted and fixed on the upper part of the restraining groove 26.
A notch 48 is provided on a part of the circumference of the key code portion 46 composed of the annular protrusion, which serves as a positioning means when the operation key 43 is inserted into the inner cylinder 3. The key code part 47 is passed.
[0027]
When the protruding plate-shaped key code portion 47 that has entered between the annular protruding key cord portions 46 through the notch 48 rotates the rotor 30 to a predetermined angle, the operation key 43 is caught on the side surface of the annular protruding portion. It cannot be removed from the inner cylinder 22.
[0028]
As described above, the locking device for a manhole cover according to the first aspect of the present invention includes a first lock unit for locking the cover to the fixed receiving frame of the manhole, and a passage portion for the operation key of the first lock unit. It is configured in a two-stage position with the inserted second lock unit. After extracting the second lock unit using the second lock unit operation key, using the first lock unit operation key Since the locking of the lid with respect to the fixed receiving frame is released, the security function as the locking device is enhanced.
[0029]
In the locking device for a manhole cover according to the second aspect of the invention, the second lock unit is an inner cylinder inserted into an upper half of an outer cylinder of the first lock unit, and the second lock unit is not rotatable and moves vertically in the inner cylinder. A locking plate that is housed so as to be urged upward by a spring member, a rotor having a lower end inserted into a lower guide portion of the inner cylinder, and a lock bolt having an inner end inserted into the guide portion A rotation stopping part for making the rotor unrotatable and a rotation permitting part for making the rotor rotatable are formed above and below the rotor, and a tip part of the operating key of the second lock unit is formed. A drive portion for receiving the rotation stopping portion of the rotor is formed, and the lock bolt is detached from the receiving portion on the lid side when the rotor is turned with the operation key. First, access from intruders Receiving it to have a much higher security function as lock unit, together with the first lock unit in the lower stage is improved effectiveness as manhole lid locking device. Further, the configuration of each lock unit can withstand poor use environment exposed to rainwater or muddy water.
[0030]
In the locking device for a manhole cover according to the third aspect of the present invention, when the operation key of the second lock unit is turned to a position where the lock bolt is detached from the metal receiving part on the cover side, the operation key is moved from the inner cylinder. Since the second lock unit is prevented from being pulled out, the second lock unit can be immediately pulled out from the outer cylinder by pulling the operation key, which is excellent in workability.
[Brief description of the drawings]
FIG. 1 is a plan view of a use state of a locking device for a manhole cover according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the locking device for a lid of FIG. 1 in a locked state.
FIG. 3 is a longitudinal sectional view of the locking device for a lid of FIG. 1 in a section different from that of FIG. 2;
FIG. 4 is a front view of a second lock unit used in the lid locking device of FIG. 1;
FIG. 5 is a plan view of the second lock unit of FIG.
6 is a bottom view of the second lock unit of FIG.
FIG. 7 is a sectional view taken along line BB of FIG. 5;
8 is a sectional view taken along line CC of FIG. 5;
FIG. 9 is a longitudinal sectional view showing a state where an operation key is inserted into the second lock unit of FIG. 4;
FIG. 10 is a front view of the operation key of FIG. 9;
FIG. 11 is a bottom view of the operation key of FIG. 9;
FIG. 12 is a front view of an operation key of a first lock unit used in the lid locking device of FIG. 1;
FIG. 13 is a sectional view taken along line DD of FIG. 12;
FIG. 14 is a sectional view taken along line AA of FIG. 3;
FIG. 15 is a longitudinal sectional view showing a state where the cap and the cover are removed in the lid locking device of FIG. 1;
FIG. 16 is a longitudinal sectional view showing a state where an operation key is inserted into a second lock unit in the lid locking device of FIG. 15;
17 is a longitudinal sectional view showing a state where the second lock unit is removed by the operation key in the lid locking device of FIG. 16;
18 is a longitudinal sectional view of the locking device for a lid of FIG. 17 in a state where an operation key is inserted into a first lock unit.
[Explanation of symbols]
DESCRIPTION OF REFERENCE NUMERALS 1 First lock unit 2 Lid 3 Outer cylinder 4 Lock shaft 5 Manhole fixed receiving frame 6 Fixed receiving frame side receiving part 7 Stopper plate 8 Operating key of first locking unit 9 Key receiving part of locking shaft 10 Operating key Key code portion 11 bottom cover member 12 center hole 13 of bottom cover member nut 14 fitting hole 15 depressed portion 16 fixing ring plate 17 washer member 18 cap 19 cover 20 top opening 21 second lock unit 22 inner cylinder 23 vertical Groove 24 Restriction member 25 Locking plate 26 Restriction groove 27 Outer peripheral projection 28 Lower guide part 29 Shaft hole 30 Rotor 31 Lower annular groove 32 Retaining pin 33 Guide hole 34 Lock bolt 35 Spring member 36 Side hole 37 Side metal cover Part 38 Drive cam projection 39 Passive cam groove 40 Non-circular receiving hole 41 Rotor rotation restricting part 42 Rotor rotation permitting part 43 Operation key 44 for second lock unit 44 Operation key driving part 4 The key code portion 48 notch of the key code portion 47 inner cylinder key spring member 46 operation

Claims (3)

A first lock unit that is provided on the lid side and locks the lid in a closed position with respect to the fixed receiving frame of the manhole; and a first lock unit formed on the lid side, which is inserted into a passage portion of an operation key, and And a second lock unit that is restrained so as to be unremovable. After the second lock unit is extracted by using the operation key of the second lock unit, the second lock unit is removed from the fixed receiving frame by using the operation key of the first lock unit. A locking device for a manhole cover that unlocks the cover. The first lock unit includes an outer cylinder vertically penetrating the lid, a lock shaft rotatably housed in a lower half of the outer cylinder, and a fixed lower end portion of the lock shaft, The operating key of the first lock unit has a key code portion formed at the tip end thereof, which is inserted into a key receiving portion formed at the upper end of the locking shaft. And
The second lock unit has an inner cylinder inserted into the upper half of the outer cylinder, and is accommodated in the inner cylinder so as to be non-rotatable and vertically movable, and has a non-circular receiving hole formed at the center. A locking plate, a spring member for urging the locking plate in an ascending direction, a rotor having a lower end inserted into a vertical shaft hole of a lower guide portion of the inner cylinder, and a lateral direction of the guide portion. A lock bolt movably inserted into the guide hole, and a rotation stop portion that disables rotation of the rotor when engaged with a receiving hole of the locking plate, and a rotatable portion on the upper portion of the rotor; The operation key of the second lock unit has a driving portion for receiving the rotation restricting portion of the rotor formed at the front end, and the operation key of the second lock unit is formed by using the operation key. Lock bolt driven by the rotor when the rotor is turned by a predetermined angle Manhole lid locking device according to claim 1, characterized in that the withdrawal from the socket member of the lid side. When the operation key of the second lock unit is turned to a position where the lock bolt is released from the receiving part on the lid side, the key code of the operation key is related to the key code provided on the inner surface of the inner cylinder. The locking device for a manhole cover according to claim 2, wherein the operation key is not removed from the inner cylinder.

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