JPH046821B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a locking device that is applied to an iron cover such as a manhole for an underground cable conduit or a manhole for sewerage, which is equipped with a handle for opening the cover.

[Conventional technology]

As a conventional locking device for an iron lid with a handle, there is one disclosed, for example, in Japanese Utility Model Publication No. 14929/1983.
It has an annular handle that is pivotally connected to a locking member that passes through the iron lid from top to bottom, and can be placed in a recessed position on the top of the iron lid and can be placed in a folded position or in a raised position.
By rotating the locking member in the raised state, the locking member rotates and enters the unlocked state. To lock, perform the opposite operation.

In addition, there are iron manhole covers for underground cables that have a double structure, and many of them are locked by locking the inner inner cover. This is because the outer cover coincides with the ground surface, so it is not possible to create a structure that creates a convex portion on the upper surface, but there is no problem with the inner cover. However, although the outer lids of all of them are strong, none of them have strong inner lids, and if you try to force the lids open, you can easily break them with a hammer or the like.

[Problem that the invention seeks to solve]

With the conventional locking device for the outer lid, since the method of opening the lid can be determined from the appearance of the iron lid, even a person other than the person concerned can easily open the lid, so there is a problem that accidents such as cable breakage may easily occur due to mischief or other reasons. be. The locking device for the inner lid also has a similar problem in that it can be easily destroyed.

[Means for solving problems]

The means according to the first invention is provided vertically through the iron lid so that it can be raised and lowered by a predetermined dimension, and in the raised state, the upper part is formed as a grip for opening the lid, and in the lowered state, the lower part is formed to be a grip for lifting and locking. a handle formed to be a mating portion; and a handle that is supported at a suitable position on the back surface of the iron lid close to the side of the engaged portion so as to be pivotable around an axis substantially perpendicular to the surface of the iron lid. A pivoting member having an engaging portion that can take a locked position in which it is engaged with the engaged portion and an unlocked position in which it is disengaged from the engaged portion by pivoting the cage;
and a key engaging portion provided on the rotating member so that the rotating member can be operated by inserting a key through a key insertion hole provided through the iron lid.

That is, this allows the pivoting member to restrain the handle in the lowered state.

The means according to the second invention is provided close to the receiving frame of the iron lid so that it can be raised and lowered by a predetermined distance by penetrating the iron lid vertically, and is formed so that the upper part becomes a grip for opening the lid when in the raised state, and when in the lowered state. A handle whose lower part is formed to be an engaged part for locking upward, and a handle that is located at a proper place on the back surface of the iron lid near the side of the engaged part and has an axis approximately perpendicular to the surface of the iron lid. It is supported so as to be able to rotate around the periphery, and when it rotates, it engages with the engaged portion and is disengaged from the locked position located below the protrusion provided on the receiving frame and from the underside of the engaged portion and the protrusion. a pivoting member having an engaging portion capable of taking an unlocked position; and a pivoting member provided in the pivoting member so that the pivoting member is operated by inserting a key through a key insertion hole provided through the iron lid. It consists of a key engagement part.

That is, in this case, the pivot member restrains the handle in a lowered state and also engages with the receiving frame.

[Effect]

In the first invention, when the lid is closed and the handle is in a lowered state, the key is inserted through the key insertion hole and engaged with the key engagement portion of the rotating member, and the rotating member is rotated with the key to lock and lock the lid. Unlock it. The locked state is a state in which the engaging portion of the pivoting member engages with the upwardly locking engaged portion of the handle. In this locked state, the handle is restrained in the lowered state, so the handle cannot be lifted up and used as a grip for opening the lid. Therefore, since there is no clue to open the iron lid, which is a heavy object, the iron lid cannot be opened even if the iron lid is not particularly locked to the receiving frame. The unlocked state is a state in which the engaging portion of the pivoting member is disengaged from the upwardly locking engaged portion of the handle. In this unlocked state, the handle can be raised, and by lifting it with your fingertips, a grip for opening the lid is formed. Therefore, the iron lid can be opened and closed using this grip.

In the second invention, in addition to the structure of the first invention, the pivoting member is also positioned below the ridge provided on the receiving frame in the locked state, so that the handle can be moved as in the first invention. In addition to restraining in the lowered position,
As the rotating member comes to engage with the flange of the receiving frame when the iron lid rises slightly, it is impossible to lift the handle, and even if you try to lift the iron lid by any means, the rotating member and the flange of the receiving frame will be damaged. It cannot be lifted unless the relationship with it is damaged. Note that locking and unlocking operations can be performed in the same manner as in the first invention.

〔Example〕

A first embodiment will be explained using FIGS. 1 to 5. This embodiment was implemented on a rectangular iron lid 1 and its receiving frame 2 as shown in FIG. In the figure, 3 is a handle, 4 is a rotating member, and 5 is a key engaging portion.

As seen in Fig. 3, the handles 3 are paired on the left and right, and are located close to the receiving frame 2 on both sides of the iron lid 1, and the same handles are located in symmetrical positions. One of them will be explained. The shape of the handle 3 is as shown in Figure 4 and other figures.
It has a substantially rectangular annular shape, and its upper end is connected to the vertical portions 11, 11, which are inserted into two circular holes 10, 10, respectively, which are vertically penetrated through the iron lid 1, as shown in the figure. It is formed so as to connect the lower ends of the vertical parts 11, 11 with a grip part 13 for opening the lid, which is located in the recess 12 so as not to protrude beyond the upper surface of the iron lid 1 in this state. It is formed by a raised locking engaged portion 14. This handle 3 is
When pulled up from the state shown by the solid line in FIG. 4 to the state shown by the imaginary line, the grip part 13 becomes in a grippable state.

As seen in FIG. 1, the rotating member 4 includes a cylindrical portion 15, a nut 16 screwed into the upper end of the cylindrical portion 15, and an L-shaped hook portion 1 provided at the lower end of the cylindrical portion 15.
The housing 19, which is fixed to the back surface of the iron lid 1 with bolts 18, supports the nut 16 so that the pivoting member 4 can be pivoted around the central axis of the cylindrical portion 15, and is slightly displaced vertically. I support you so that you can do it. Adjustment of the nut 16 minimizes upward displacement of the grip 13 in the locked state. The supported position by the housing 19 is a position where the hook part 17 can be engaged with and disengaged from the upper side of the engaged part 14 of the handle 3 by turning. A compression coil spring 20 is provided on the outer periphery of the cylindrical portion 15 to apply a downward pressing force to the rotating member 4 in response to the small amount of vertical displacement.
A key engaging part 5 in the form of a square hole is bored on the center line of the pivot of the hook part 17, and the tip of the hook part is formed as the engaging part 22. The engaging portion 22 has a concave lower surface 23 that engages with the engaged portion 14, and a portion 24 that passes through the engaged portion 14.
The lower surface is tapered upward toward the front. A projecting edge 25 is provided to protrude from the receiving frame 2 so as to be located above the portion 24 when the engaging portion 22 of the rotating member 4 and the engaged portion 14 of the handle 3 are engaged.

A key insertion hole 26 is inserted into the iron lid 1 coaxially with the inner hole of the cylindrical portion 15 and vertically penetrates the key engagement portion 5.
A rubber stopper 27 is fitted into the key insertion hole 26.

A key 28 shown in FIG. 5 is used to lock and unlock the iron lid 1. That is, in the locked state shown in FIG. 1, the rubber stopper 27 is removed, the key 28 is inserted through the key insertion hole 26, the square part 29 thereof is engaged with the key engaging part 5, and the handle 30 is turned. In the figure, 32 is a guide rod. In the locked state, as shown in FIG. 1, the engaging portion 22 of the rotating member 4 is engaged with the engaged portion 14 of the handle 3 in the lowered state, and the tip portion 24 of the engaging portion 22 is engaged with the receiving frame. It is located below the protruding edge 25 of No. 2. In the unlocked state, press the handle 30 approx.
This is the state in which the rotating member 4 is rotated by 45 degrees as shown by the imaginary line in FIG. There is.

A second embodiment is shown in FIG. This embodiment was implemented on the outer lid of a particularly heavy iron lid with a double structure, and the main difference from the first embodiment is that the protrusion 25 in the first embodiment is omitted. Other equivalent parts are indicated by the same drawing symbols and their explanation will be omitted. In the figure, 31 is an inner lid.

In this embodiment as well, locking and unlocking are performed in the same manner using a key 28 similar to that shown in FIG. Note that the locked state is a state in which the handle 3 cannot be lifted to the raised position, but it is possible to lift the entire iron lid 1 by some method. However, since the handle 3 cannot be lifted, the grip part 13 cannot be grasped and the lid cannot be opened easily.

In the above embodiment, the key 28 and the key engaging portion 5 are engaged with each other by engaging a square column with a square hole, but for example, another polygonal column and a polygonal hole may be engaged with each other. Furthermore, the rotating member may be rotated by a different key and a different engagement relationship,
In short, it is sufficient that the rotating member can be rotated using a relatively small key insertion hole provided through the iron cover and a key that can be inserted into the key insertion hole.

〔Effect of the invention〕

According to this invention, since the method of opening the iron lid cannot be easily determined from the appearance of the iron lid, it is possible to obtain a locking device that cannot be easily opened by anyone other than the person concerned. In addition, this locking device can be applied to the outer cover of a double-layered iron cover, and since the cover cannot be opened easily, it is extremely effective in terms of safety when applied to the iron cover of an underground cable conduit manhole. It is something.

[Brief explanation of drawings]

FIG. 1 shows the main parts of the first embodiment of the present invention in a locked state, and is an enlarged cross-sectional view taken along line A-A in FIG. 3. FIG. 2 is a bottom view corresponding to FIG. 1 of the same embodiment, and FIG. is a plan view of the iron lid and receiving frame of the first embodiment, and FIG. 4 is a plan view of the third embodiment.
5 is a front view of the key used in the locking device of the first embodiment, and FIG. 6 shows the main parts of the second embodiment in the locked state. FIG. 3 is a corresponding enlarged cross-sectional view. 1... Iron lid (outer lid), 2... Receiving frame, 3... Handle,
4... Rotating member, 5... Key engaging part, 13... Gripping part, 14... Engaged part, 22... Engaging part, 24...
... tip part, 25 ... ridge, 26 ... key insertion hole,
28...Key.

Claims (1)

[Scope of Claims] 1. It is provided vertically through the iron lid so that it can be raised and lowered by a predetermined dimension, and in the raised state, the upper part is formed as a grip for opening the lid, and in the lowered state, the lower part is engaged for raising and locking. a handle formed to form a section, and a handle that is pivotably supported around an axis substantially perpendicular to the surface of the iron lid at a suitable position on the back surface of the iron lid close to the side of the engaged portion. A rotating member having an engaging part that can take a locked position engaged with the engaged part and an unlocked position disengaged from the engaged part by turning, and a key insertion hole provided through the iron cover. A locking device for an iron lid comprising a key engaging portion provided on a rotating member so that a key is inserted and the rotating member is rotated. 2 It is installed close to the receiving frame of the iron lid so that it can be raised and lowered by a predetermined dimension by penetrating the iron lid vertically, and in the raised state, the upper part is formed as a grip part for opening the lid, and in the lowered state, the lower part is formed as a lifting locking part. A handle formed to serve as an engaging portion; and a handle supported at a suitable position on the back surface of the iron lid close to the side of the engaged portion so as to be pivotable around an axis substantially perpendicular to the surface of the iron lid. As a result of its rotation, it engages with the engaged portion and has a locked position located below the protrusion provided on the receiving frame, and an unlocked position where it is disengaged from the engaged portion and the lower side of the protrusion. a pivoting member having an engaging portion for obtaining a lock, and a key engaging portion provided on the pivoting member such that the pivoting member is operated by inserting a key through a key insertion hole provided through the iron lid. Iron lid locking device.