JPH08319743A - Locking device for grating cover - Google Patents

Abstract

PURPOSE: To precisely prevent the approach to a locking shaft by a simplified protective structure, easily and inexpensively perform manufacture and assembling, and quickly perform opening operation of a grating cover. CONSTITUTION: A circular upper board part 5 of a protective cap 7 is tightly fitted in a central through hole 30 of an upper surface panel 3, and a cylinder part 6 of the protective cap 7 is tightly fitted in a key inserting hole 8 of a case 2, and an iron core 4 is fixed to the under surface side of the upper board part 5, and a key hole 12 into which a key part of one end part of a T-shaped handle key is inserted, is arranged in an upper end part of a locking shaft 9. A sliding plate 13 to slidingly move in the horizontal direction by being driven by a cam of a lower end part of the locking shaft 9, is provided, and a clamp plate is connected to the sliding plate 13 by a connecting pin. The clamp plate 18 is pivotally fixed to the case 2 by a horizontal pivot 20, and a magnet 23 to attract the iron core 4 is embedded in an attracting part 24 of the other end part of the handle key 10.

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 grating cover at the entrance of a common groove for accommodating a communication cable or the like.

[0002]

2. Description of the Related Art In a locking device for a grating lid disclosed in Japanese Utility Model Laid-Open No. 3-18369, a T-shaped handle key is inserted into a key hole at an upper end of a locking shaft through a central through hole of a top panel of a case. When the lock shaft is rotated in the specified direction by the handle, the cam interlocked with the lock shaft slides the slide plate in the specified direction, and the slide plate unlocks the stopper plate around the horizontal pivot of the upper end. In order to rotate in the direction, the hook portion at the lower end of the stopper plate is adapted to be detached from the receiving plate on the fixed frame body side.

In this conventional apparatus, in order to prevent an unauthorized person from approaching the locking shaft, a lock unit is separately provided on the upper panel, and a shutter member driven by the operation of the lock unit causes a central through hole of the upper panel. It incorporates a protection mechanism that blocks the passage from the lock shaft to the keyhole.

However, since the structure of this protective mechanism is complicated, not only the cost of manufacturing and assembling is high, but also the locking device for the grating lid is used outdoors, so that the complicated protective mechanism causes a failure. Moreover, since it takes time to operate the lock unit and the shutter member, the opening operation of the grating lid cannot be performed quickly.

[0005]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a simplified protective structure which can accurately prevent access to a locking shaft, which can be manufactured and assembled easily and at low cost, and in which the opening operation of a grating lid is performed. It is an object of the present invention to provide a locking device for a grating lid which can be quickly operated and has excellent durability.

Still another object of the present invention is to provide a locking device for a grating lid having a simplified mechanism for unlocking the grating lid from below.

[0007]

The locking device for a grating cover according to the present invention will be described below with reference to the accompanying drawings. In the locking device for a grating cover according to the present invention, a stainless steel upper panel 3 fixed to the grating cover 1 will be described. The case 2 is fixed to the lower side of the upper panel 3, a key insertion hole 8 opened in the center through hole 30 of the upper panel 3 is provided in the case 2, and the circular upper panel 5 of the protective cap 7 made of stainless steel is attached to the center of the upper panel 3. The upper plate 5
The cylindrical portion 6 connected to the lower side of the case 2 is tightly fitted into the key insertion hole 8 of the case 2, and the iron core 4 is fixed to the lower surface side of the upper panel 5, and the space below the key insertion hole 8 in the case 2. A lock shaft 9 is provided vertically, and a key hole 12 into which a key portion 11 at one end of a T-shaped handle key 10 is inserted is provided at an upper end of the lock shaft 9.

A slide plate 13 which is driven by a cam 29 fixed to the lower end of the locking shaft 9 and slides in the horizontal direction is provided, and an intermediate portion of the stopper plate 18 is connected to the tip of the slide plate 13 by a connecting pin 19. The hook 17 is connected to the case 2 by the horizontal pivot 20 at the upper end of the stopper plate 18, and the hook 17 that engages with and disengages from the receiving plate 16 fixed to the fixed frame 15.
8 is provided at the lower end portion of the handle key 10 and the other end portion of the handle key 10 is provided with the suction portion 2
4, the magnet 23 for attracting the iron core 4 of the protective cap 7 is embedded in the attraction portion 24. Also, slide plate 1
The unlocking operation plate portion 14 is formed at the base end portion of 3 so as to be close to the vertical wall plate portion 34 of the case 2 and bent downward.

[0009]

In a normal state in which the grating cover 1 is locked to the fixing frame 15, the protective cap 7 is closely fitted into the central through hole 30 of the upper panel 3 and the key insertion hole 8 of the case 2. When opening the grating cover 1 for checking the communication cable or the like, the suction portion 24 of the T-shaped handle key 10 is brought into contact with the upper panel 5 of the protective cap 7 and the suction portion 2 is opened.
The protective cap 7 is pulled out vertically from the central through-hole 30 and the key insertion hole 8 by applying a magnetic attraction between the magnet 23 built in 4 and the iron core 4 built in the protective cap 7.

[0010] The key portion of the handle key 10 is inserted into the key insertion hole 8 opened by removing the protective cap 7, and the key portion 11 is fitted into the key hole 12 of the locking shaft 9, and then the handle key 10 is fixed to a predetermined position. When it is rotated in the direction, the slide plate 13 slides in the unlocking direction by the cam 29 that is interlocked with the locking shaft 9. Therefore, the stopper plate 18 rotates about the horizontal pivot 20, and the hook portion 17 separates from the receiving plate 16. As a result, the locking of the grating lid 1 with respect to the fixed frame body 15 is released, so that the glazing lid 1 can be opened.

When the opening operation is performed from the lower surface side of the grating lid 1, the unlocking operation plate portion 1 at the base end portion of the slide plate 13 is provided.
4, the index finger and the middle finger are put on the vertical wall plate 34 of the case 2, and the unlocking operation plate 14 is attached to the vertical wall plate 3.
Pull to the 4 side. This causes the slide plate 13 to slide backward, so that the hook portion 17 of the stopper plate 18 is separated from the receiving plate 16 on the fixed frame body 15 side.

[0012]

In the illustrated embodiment, the die-cast case 2 is fixed to the lower surface of the upper panel 3 by stud bolts 26 and nuts fixed to the upper panel 3, and the upper panel 3 is fixed to the upper panel 3. Stud bolt 27
It is fixed to the grating lid 1 by means of a nut and a suitable tightening bracket member. The cylindrical locking shaft 9 has an outer flange 39 abutting against an inner shoulder 40 of the case 2, and a locking screw 37 is inserted into the outer groove 38 of the locking shaft 9 from the case 2 side.

An interlocking adapter 36 is fitted into the lower end angular shaft portion 41 of the locking shaft 9, and the cam 29 is adapted to the adapter 36.
And is fixed. The cam 29 is provided with a pair of left and right wing plate portions 31, and the wing plate portions 31
Is inserted into a slot 32 provided in the side plate portion of the first embodiment. When the locking shaft 9 rotates, the wing plate portion 31 presses the inner wall surface of the slot 32, so that the slide plate 13 is driven in the unlocking direction.
The slide plate 13 is provided with an escape slot 33 for an adapter 36. The connecting pin 19 inserted into the front end portion 42 of the slide plate 13 is
Has been inserted into.

In the torsion coil spring 25 in which the coil portion is fitted to the horizontal pivot 20, one straight end 25a is in contact with the case 2 and the other straight end 25b is in contact with the stopper plate 18, and The plate 18 is rotationally biased in the locking direction.
The spring 25 also functions as a spring for returning the slide plate 13 and the locking shaft 9.

[0015]

As described above, in the locking device for the grating lid of the present invention, the central through hole 30 of the top panel 3 and the case 2 are provided.
By tightly fitting the protective cap 7 into the key insertion hole 8 of the lock holder, an unauthorized person is prevented from approaching the lock shaft 9, and when necessary, the magnet 2 of the attracting portion 24 of the T-shaped handle key 10.
Since the protective cap 7 is drawn vertically by applying a magnetic attraction force between the iron core 4 of the protective cap 7 and the iron core 4 of the protective cap 7, the protective mechanism is greatly simplified as compared with the conventional device. Thus, the manufacture and assembly of the entire apparatus can be performed easily and at low cost.

In addition, since the attaching and detaching operation of the protective cap 7 is performed easily and quickly, the operability of the entire apparatus is improved as compared with the conventional apparatus in which a complicated lock unit and a shut-off mechanism are incorporated, and the grating cover 1 is provided. Can be quickly unlocked and opened. Since the top panel 3 and the protective cap 7 are made of stainless steel, the durability when used outdoors is further improved. Further, as a mechanism for opening the grating lid 1 from the lower surface side, an unlocking operation plate portion 14 formed by bending downward at the base end of the slide plate 13 adjacent to the vertical wall plate portion 34 of the case 2 is provided. Since there is only one, the mechanism is simplified also in this respect, and the cost can be saved.

[Brief description of drawings]

FIG. 1 is a plan view of the grating lid when the grating lid locking device according to the embodiment of the present invention is used, showing a state in which a protective cap is fitted.

FIG. 2 is a plan view showing a state in which a protective cap of the locking device for the grating lid is removed.

FIG. 3 is a partially longitudinal side view of the locking device for the grating lid.

FIG. 4 is a partial cross-sectional bottom view of the locking device for the grating lid.

FIG. 5 is a front view of a handle key used in the locking device for the grating lid.

[Explanation of symbols]

 1 Grating lid 2 Case 3 Top panel 4 Iron cap of protective cap 5 Upper part of protective cap 6 Cylindrical part of protective cap 7 Protective cap 8 Case key insertion hole 9 Locking shaft 10 Handle key 11 Handle key key 12 Locking Key hole of shaft 13 Slide plate 14 Unlocking operation plate part of slide plate 15 Fixed frame body 16 Receiving plate 17 Hook part of stopper plate 18 Stopper plate 19 Connecting pin of stop plate and slide plate 20 Stopper plate Horizontal pivot 21 Case removal prevention projection 22 Handle key receiving groove 23 Magnet for attracting part 24 Handle key attracting part 25 Twisting coil spring 26 Case fixing stud bolt 27 Top panel fixing stud bolt 28 Case mounting plate 29 Locking Shaft Cam 30 Central Through Hole on Top Panel 31 Cam Drive Wing Plate 32 Slide Plate Slot 3 6 Adapter for interlocking

Claims (2)

[Claims] 1. A case (2) is fixed to a lower side of a stainless steel upper panel (3) fixed to a grating cover (1), and a key insertion hole (8) opened in a central through hole (30) of the upper panel (3) is formed.
And a circular upper plate 5 of a protective cap 7 made of stainless steel.
Is tightly fitted in the central through hole 30 of the upper panel 3, the cylindrical portion 6 continuously provided on the lower side of the upper board 5 is tightly fitted in the key insertion hole 8 of the case 2, and the lower surface of the upper board 5 is made of iron. Fix the core 4,
A lock shaft 9 is vertically provided in the space below the key insertion hole 8 in the case 2, and a key hole 12 into which a key portion 11 at one end of a T-shaped handle key 10 is inserted is provided at an upper end of the lock shaft 9. And a slide plate 13 which is driven by a cam 29 fixed to the lower end of the locking shaft 9 and slides in the horizontal direction. The slide plate 13 is connected to the front end of the slide plate 13 by a connection pin 19 at an intermediate portion of the stopper plate 18. The upper end of the stopper plate 18 is pivotally attached to the case 2 by the horizontal pivot 20, and a hook 17 is provided at the lower end of the stopper plate 18 for engaging and disengaging with the receiving plate 16 fixed to the fixed frame 15. ,
An attraction portion 24 is provided at the other end of the handle key 10, and a magnet 23 that attracts the iron core 4 of the protective cap 7 is attached to the attraction portion 2.
4. A locking device for a grating lid, wherein the locking device is embedded in 4. 2. The locking device for the grating lid according to claim 1, wherein the unlocking operation plate portion 14 is formed on the base end portion of the slide plate 13 so as to be close to the vertical wall plate portion 34 of the case 2 and bent downward. apparatus.