JPH04261920A - Locking device for cover of manhole etc. - Google Patents

Abstract

PURPOSE:To prevent the operation of a cover locking device from being difficult on account of rusting even in the case of the cover exposed to rain of a manhole or the like, and moreover the lock of the cover from spontaneously unlocking on account of vibration given to the cover by a car or the like. CONSTITUTION:In a locking device for a cover at the hatchway of a manhole or the like, a lock shaft 11 provided with a manual handle 16 at its lower end is supported rotatably and vertically movably to the cover. The lock shaft 11 is provided with a pinion 15, and a lock slide bar 12 is supported slidably right and left to the cover, and provided with a rack gear 19. The pinion 15 is arranged so as to freely mesh with the rack gear 19, and a spring 17 energizes the lock shaft 11 upward to hold the pinion 15 at a position where it disengages from the rack gear 19. The opening and closing of the cover is therefore released from difficulty caused by rusting between the pinion and the rack gear, and in the case of the operation of the cover locking device, the lock shaft 11 is lowered against the spring 17 to mesh the pinion 15 with the rack gear 19, and the slide bar 12 is slide-right and left to lock and unlock the cover.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a locking device for the entrance/exit cover of a manhole or an underground space such as a basement, and the locking device can be unlocked from both the outside and the inside. It is effective when used to improve the ease of locking operation and the durability of the locking device.

0002

2. Description of the Related Art A conventional locking device for a manhole cover will be briefly described with reference to FIG. At the entrance E to the underground space C, there is a support frame F with an L-shaped cross section that supports the lid 1.
A hook 3 protruding from the underside of one side of the lid 1 is hooked onto the support frame F, and a lock 4 protruding from the underside of the other side is engaged with the support frame F to lock the lid 1 to the support frame F. are doing. The lock 4 has a vertical lock shaft 5 and a lock arm 6 that is threaded onto the lock shaft 5. A tool is engaged with a square hole 7 at the upper end of the lock shaft 5, and the lock shaft is inserted from the outside. Lock and unlock the lock 4 from the outside by rotating the lock arm 5 90 degrees left and right, and lock and unlock the lock 4 from the inside by rotating the lock arm 6 90 degrees left and right with respect to the lock shaft 5 from the inside. It is for locking. usually,
Since the lid 1 is exposed to rain, the lock arm 6 and lock shaft 5
The screws that connect the lid to the lid become hard due to rust, etc., which often makes manual operation impossible in emergencies. Also, the lock arm 6 may naturally loosen against the lock shaft 5 due to severe vibrations applied to the lid from automobiles, etc. The inconvenience of having to rotate the lock to unlock it often occurred.

0003

[Problems to be Solved by the Invention] The present invention has been made in view of the above circumstances, and it is possible to solve the problem that even if the cover of a manhole etc. is exposed to rain, it becomes difficult to open and close it manually due to rust. To provide a lid locking device with good durability, safety, reliability, and operability, which prevents the lid from becoming unlocked automatically due to vibrations applied to the lid from an automobile, etc. The task is to do so.

0004

[Means for Solving the Problems] The means taken to solve the above problems are constituted by the following elements (a) to (d). (a) A lock shaft with a manual operation part provided at the bottom is supported so as to be rotatable and movable up and down relative to the lid, and a pinion is provided on the lock shaft; (b) A lock slide bar is moved left and right with respect to the lid. (c) The pinion is disposed so as to be able to engage with the rack gear, and the lock shaft is urged upward by a spring to cause the pinion to move. (d) The lock slide bar must be held in two positions, the locked position and the unlocked position, by the positioning stopper.

[0005]

[Operation] In both the locked and unlocked states, the lock shaft is pushed upward by the biasing spring, its pinion comes off the rack gear of the lock slide bar, and the lock slide bar is moved to the locked position by the positioning stopper. , or held in the unlocked position. In this state, even if severe vibration were applied to the lock shaft and the lock shaft rotated, the pinion of the lock shaft was disengaged from the rack gear of the lock slide bar, so the rotation of the lock shaft would not move the lock slide bar. Its position will not change. Engage a tool such as an operating handle with the upper end of the lock shaft, push down the lock shaft against the biasing spring, engage the pinion of the lock shaft with the rack gear of the lock slide bar, and then rotate the lock shaft. . As a result, the lock slide bar slides left and right and moves from the locked position to the unlocked position or from the unlocked position to the locked position. Then, it is locked again at the moved position by the positioning stopper and held at that position. When operating from underground, grasp the handle at the bottom of the lock shaft and pull down the lock shaft to engage the pinion with the rack gear, then rotate the lock shaft left and right to move the lock slide bar left and right. Slide it. During a long period of service, the lock shaft and lock slide bar will not become inoperable due to rust, and the pinion and rack gear will not become inoperable. Therefore, its durability is improved. Furthermore, safety can be ensured by taking measures to prevent unauthorized use of the engagement relationship between the upper end of the lock shaft and the tool.

[0006]

[Embodiment] First, a first embodiment will be explained with reference to FIGS. 1 and 2. A locking device R of the present invention is provided in which a hook 3 protruding from the lower surface of the right side of the lid 1 of the underground space is engaged with a lock bracket 2 provided on the wall surface W, and the locking device R is provided on the lower surface of the left side.
The lid 1 is locked by engaging the left end of the lock slide bar 12 with the lock bracket 2 on the wall surface W. The lock shaft 11 is a lock casing 13 fixed to the bottom surface of the lid 1.
The lock shaft 11 has a pinion 15, and the lower end of the lock shaft 11 has a handle 16.
is provided. A biasing spring 17 is provided between the bottom 14 of the lock casing 13 and the pinion 15, thereby biasing the lock shaft 11 upward. The upper end of the lock shaft 11 is a hollow cylinder, and a hexagonal part 18 is provided at the bottom. The lock slide bar 12 is supported by a lock casing 13 so as to be slidable left and right, and a rack gear 19 is provided on the side surface thereof. Also, lock casing 1
3 is provided with a click stop 20 as a positioning stopper for the lock slide bar 12 (detailed explanation thereof will be omitted as this is conventionally well known and commonly used), which is attached to the side of the lock slide bar 12. The lock slide bar 12 is held in either the locked position or the unlocked position by selectively engaging with either of the two provided holes. An indicator rod 21 is provided on the upper surface of the right end of the lock slide bar 12, and the upper end of this indicator rod faces the slot 23 of the indicator plate 22 on the ground surface. Further, a lock detection switch 24 is provided opposite the right end of the lock slide bar 12, and detects that the lock slide bar 12 is at the left end position, that is, the lock position. When the lock slide bar is in the lock position, the upper end of the indicator rod 21 is at the left end of the slot 23 of the indicator plate 22, so that it can be visually confirmed from the outside that the lock slide bar is in the lock position. By detecting that the lock slide bar 12 is in the locked position using the lock detection switch 24, the state of the locking device R can be remotely monitored. It is desirable to fit a plug into the hollow cylindrical portion at the upper end of the lock shaft 11 to prevent rainwater, foreign matter, etc. from entering the inside thereof. Normally, the lock slide bar 12 is in the lock position, with its left end engaging the lower surface of the lock bracket 2. In this state, the lock shaft 11 is urged upward by the urging spring 17, and the pinion 15 is pressed against the lock slide bar 1.
It has come off from the rack gear 19 of No. 2. Remove the plug (not shown) at the upper end of the lock shaft 11, engage a tool such as an operating handle with the hexagonal part 18, and push the lock shaft 1 against the biasing spring 17.
1 to lock the pinion 15 on the slide bar 12
In this state, the lock shaft 11 is rotated clockwise. As a result, the lock slide bar 12 slides to the right against the locking force of the click stop 20, and its left end is removed from the lock bracket 2. In other words, the lock is released. To lock the door, simply rotate the lock shaft counterclockwise in the same way. Underground space C
When operating from the inside, it is sufficient to grasp the handle 16 at the lower end of the lock shaft 11, pull down the lock shaft 11, and then rotate it left and right. Next, a second embodiment will be described with reference to FIGS. 3 and 4. In this embodiment, the locking device has a pair of lock slide bars, and both the left and right sides of the lid 1 are locked to the lock bracket by the lock slide bars. The structure of the lock shaft 31 and its support mechanism are the same as in the first embodiment. A pair of lock slide bars 33 and 34 are arranged before and after the pinion 32 of the lock shaft, and each is supported by the lock casing so as to be slidable left and right. The pinion 32 meshes with rack gears 35 and 36 of the lock slide bars 33 and 34, and the rotation of the pinion 32 causes the lock slide bars 33 and 34 to slide in opposite directions. A pair of left and right holes 37 are provided on the side surface of the lock slide bar 33, and a click stop 38 selectively engages with the holes 37 to lock the lock slide bar 33 in its locked position or unlocked position. do. The same applies to the lock slide bar 34. When the lock shaft 31 is pushed down to engage the pinion 32 with the rack gears 35 and 36 and then rotated clockwise, the lock slide bar 3
3 slides to the left, and the lock slide bar 34 slides to the right, so that their respective outer ends engage with the lower surface of the lock bracket 39 on the wall. Similarly, when the lock slide bar 33 is rotated counterclockwise, the lock slide bar 33 slides to the right, and the lock slide bar 34 slides to the left to disengage from the lock bracket 39. An inclined cam surface 40 is provided on the upper surface of the lock slide bar 33, and the lower end of a vertically movable support rod 41, which is biased downward by a spring 42, is in contact with this cam surface. lock slide bar 33
When it slides left and right, the cam surface moves the instruction rod 40 up and down to indicate the locked state and unlocked state. A lock detection switch 43 is provided opposite the left end of the lock slide bar 33. This switch 4
3 may be either a contact type or a non-contact type. This embodiment has two lock slide bars 3 with a lock R provided in the center of the lid 1.
3 and 34 lock brackets 39 and 3 on both left and right sides of the lid 1.
9, the hook 3 in the first embodiment is unnecessary, and the opening/closing operation of the lid 1 is simple and easy.

[0007]

[Effects] A unique effect of the present invention is that it can solve the above problems and improve the durability, safety, reliability, and operability of locking devices for manhole covers, etc., and by providing a lock detection switch. A great advantage is that the locked position and unlocked position of the lock slide bar can be reliably detected, and thereby the locked and unlocked states of the locking device can be remotely monitored.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the entire first embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the locking device of the first embodiment.

FIG. 3 is a perspective view showing the entire second embodiment.

FIG. 4 is an enlarged perspective view of a locking device according to a second embodiment.

FIG. 5 is a sectional view of a conventional example.

[Explanation of symbols]

1... Lid 2, 39... Lock bracket 3... Hook 4... Lock 5, 11, 31... Lock shaft 6... Lock arm 7... Square hole 12, 33, 34 ...Lock slide bar 13...
Lock casing 14...Bottom of lock casing 15, 32...Pinion 16...Handle 17...Biasing spring 18...Hexagonal parts 19, 35, 36...Rack gears 20, 38...・Click stop 21, 41... Indication rod 22... Indication plate 23... Slot 24, 43... Lock detection switch 37... Hole 40... Inclined cam surface 42... Spring R ... Locking device W ... Wall surface F ... Support frame E ... Doorway C ... Underground space

Claims (3)

[Claims] Claim 1: A locking device for a lid for an entrance to an underground space such as a manhole or a basement, in which a lock shaft with a manual operation section provided below is supported so as to be rotatable and vertically movable relative to the lid; A pinion is provided, a lock slide bar is supported slidably left and right with respect to the lid, a rack gear is provided on the lock slide bar, the pinion is arranged so as to be able to engage with the rack gear, and the lock shaft is moved upward by a spring. The locking device for the lid is biased to hold the pinion in a position disengaged from the rack gear, and the lock slide bar is locked in two positions, a lock position and a lock release position, by a positioning stopper. 2. The locking device for a lid of a manhole or the like according to claim 1, further comprising a lock detection switch provided opposite to the end face of the lock slide bar. 3. The lock slide bars are a pair, and these are arranged before and after the pinion, so that the pinion can freely mesh with the rack gears of both lock slide bars.
A locking device for a lid of a manhole or the like according to claim (1).