JPH0333857B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention primarily relates to a locking device that is attached to a manhole cover that does not have a locking device.

Conventionally, manhole covers have been simply fitted into a receiving frame and used without being locked, and locking devices are especially installed on drinking water tanks and fuel storage tanks such as gasoline. This includes covers for inspection holes, etc. The reason why locking devices are not attached to general manhole covers is because they are installed on roads, etc., so they are required to have strong load-bearing strength and be inexpensive, and because they are mainly manufactured from cast iron, the weight of the cover is low. This is because it is heavy and installed in a place where there is a lot of foot traffic, so it cannot be opened or closed easily by anyone other than the person in charge of the underground facility. However, in recent years, underground facilities have come to include not only conventional water supply, sewage, and city gas facilities, but also electrical wiring, communication lines, and other facilities that play an important role in industrial activities, and inspections of these facilities have become necessary. Manholes are provided in various places, but there has been a demand for locking devices to be attached to these covers, and many locking devices that can be attached to the covers and receiver frames have been proposed and manufactured. However, as mentioned above, the lid and the receiving frame are made of cast iron, and those that are attached to the back of the lid to protrude or have a complicated locking mechanism are easy to break, and the opening and closing work is troublesome. In most cases, locks with difficult mechanisms are installed, but in this case, the locks are common and simple, and there is a risk that they can be opened easily, and lids with locks require additional steps and costs. Nakatsuta. Therefore, there is a demand for the development of a locking device that can be attached to conventionally manufactured unlocked manhole covers as needed, and at the same time, there has been a demand for a locking device that can be attached to existing manhole covers.

The present invention was made in response to such a demand, and the locking device according to the present invention uses a conventionally used padlock, and as shown in FIG. When the locking piece is attached and protruded onto the manhole cover, the locking piece is fixed and locked with a padlock.The locking piece can be locked by unlocking the padlock and removing it. The lid is detachable from the top surface so that the lid can be opened and closed, and the padlock is stored in the locking device when the lock is locked.

The following will explain the embodiments shown in the drawings.

In the locking device 1 of the embodiment shown in FIGS. 1 to 4, a box 4 in the form of a cube with an open top surface is engaged with a locking portion of a locking piece 2 that projects horizontally from the top surface of the box 4. A storage part for a padlock 10 for fixing the piece 2 is provided, and the locking piece 2 protrudes horizontally from the top surface of the box 4 and is fitted into guide rails 8 protruding from the inner surfaces of both side walls of the box 4. A horizontal groove 5 is provided on both outer surfaces of a leg piece 9 formed in a straddling manner on the back surface of the portion of the locking piece 2 located inside the box 4, and the leg piece 9 is installed so as to slide horizontally inside the box 4. A protrusion 7 is provided in the shape of a shelf at the center of the side of the locking piece 2 located inside the box 4.
Further, a locking rod 6 for locking the padlock 10 is provided protruding from the center of the bottom surface of the box 4, and its height is smaller than that of the locking piece 2.
The locking rod 6, the leg piece 9 of the locking piece 2, and the projection 7 lock the padlock 10 in an inverted J-shape. Form a void into which the

Further, as shown in FIGS. 2 and 4, the box 4 is divided into two parts, with the locking rod as the border, at the attachment part of the locking piece 2 and the original housing part of the padlock 10, and a guide rail 8 is provided on the inner surface. is provided only at the mounting portion of the locking piece 2, and a lid 3 that closes the opening on the top surface of the case 4 is attached using a hinge or the like so that it can be opened and closed.

The locking device of the embodiment shown in FIG. 5 has a locking portion of a locking piece 2 projecting horizontally from the box 4 and a locking piece 2 on a box 4 whose top surface is open, as in the previous embodiment. The original storage part of the padlock 10 for fixing is provided, and the locking piece 2 has a boss 12 vertically provided on the back side of the part of the locking piece 2 located inside the box 4, and has a through hole through which a shaft is inserted. The locking piece 2 is pivoted between opposing side walls of the box 4 so as to be movable, that is, the protruding locking piece 2 can be rotated by 90 degrees or more above the horizontal direction,
In order to project the locking piece 2 in the horizontal direction and fix it in that state, a protrusion 7 is provided on the center of the side of the locking piece 2 located inside the box 4, and a protrusion 7 is placed on the center of the bottom inside the box 4. The locking rod 6, which has a stepped portion on the lower surface of the protrusion 7 of the locking piece 2 to form a cavity into which the locking rod of the padlock 10 can be inserted, is connected to the locking rod 6, in which the locking rod locks. The protrusion is placed near the tip of 7. In addition,
In order to lock the locking piece 2 to the box 4 and rotate it upward by more than 90 degrees, a convex portion and a concave portion are provided at the contact portions on both sides of the inner wall of the box 4 and the locking piece so that the locking piece can rotate. There is no problem in installing it. In the case of this embodiment, the locking piece 2
The protrusion 7 prevents the locking piece 2 from coming into contact with the locking rod 6 when the locking piece 2 is rotated upward, and prevents the locking piece 2 from coming into contact with the locking bar 6 when the locking piece 2 is rotated upward.
In order to hold and fix the padlock horizontally, it is desirable that the locking rod of the padlock 10 be positioned close to the back surface of the protrusion 7 of the locking piece 2. Therefore, as shown in FIG. It is preferable to provide a step supporting the lock rod at a distance from the upper end of the padlock 10 at a distance approximately equal to the diameter of the lock rod.

In addition, after the main body of the padlock 10 is stored in the case 4, a lid 3 that closes the opening is attached to the case 4 so as to be openable and closable.

In addition to the embodiment shown in the drawings, the locking piece of the locking device may be rotated by 90 degrees or more in the horizontal direction. Since the locking piece is protruded from the locking piece when the locking rod of the padlock is inserted between the locking rod 6 and the boss by making a protrusion or a recess on the boss on the periphery of the hole that fits into the rotation shaft of the locking piece, the locking piece It should be configured so that it does not move.

Further, since the protruding portion of the locking piece 2 is higher than the manhole cover surface by the thickness thereof, it is preferable to round the periphery of the upper surface so that there are no corners as shown in the drawing.

The padlock is not specified in particular, but it is sufficient as long as it has an inverted J-shaped locking rod and the main body can be stored in the case.The padlock used for the locking device attached to a single manhole may differ depending on the purpose of use. You can choose to open and close with a key or the same key.

The locking device of the present invention is constructed as described above, but the main parts such as the box are similar to the manhole cover.
It is best to make it from cast iron, and when it is attached to a manhole cover, the locking device 1 should be installed at least two or more corresponding positions on the center line of the cover, as shown in Figure 6.
The upper surface of the box 4 is aligned with the upper surface of the end of the receiving frame and the lid, and the locking piece 2 is attached so as to press the lid.

The locking device 1 may be attached to the receiving frame of the manhole cover by welding, but the locking device 1 may be attached to the receiving frame of the manhole cover by welding.
As shown in Fig. 6, a pedestal 11 having bolt insertion holes is provided protruding from the bottom surface of the box 4 on both sides and further in the wing-shaped center in three directions excluding the side from which the locking piece 2 protrudes. It is best to fix it to the receiving frame using bolts and nuts, or to the concrete outside of the receiving frame using anchor bolts.

Generally, manhole covers are made of cast iron and fit into a receiving frame, so it is sufficient to install the locking device in at least two places so that the locking pieces 2 of the locking device can hold down both ends of the center line of the lid. The piece 2 is fixed as described above by inserting the locking rod of the padlock 10 into the hollow portion on the back side of the protrusion 7 of the locking piece 2 and locking it.

As described above, the locking device of the present invention can be applied to various conventionally used circular or square manhole covers that do not come with a locking device, and can be installed and delivered according to the customer's request. In addition, it can be attached to existing manhole covers, and there is no need to specially manufacture manhole covers with locks, which were conventionally manufactured, so the number of products in stock can be reduced and the product can be provided at low cost. It has advantages.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a top view, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a cross-sectional view taken along line B-B in FIG. 1, and FIG. 1 is a top view with the lid removed and only the locking piece shown in broken lines; FIG. 5 is a vertical cross-sectional view showing another embodiment; and FIG. 6 is a view showing the installed state of the locking device according to the present invention. It is a top view of a manhole. 1... Locking device, 2... Locking piece, 3... Lid, 4
...Box, 5...Groove, 6...Latching rod, 7...Protrusion, 8...Guide rail, 9...Leg piece, 10...
Padlock, 11...Pedestal, 12...Boss.

Claims (1)

[Claims] 1. The box 4, which has an open top surface and is cubic, has a locking portion of a locking piece 2 that projects horizontally from the top surface of the box 4, and a padlock for fixing the locking piece 2. 10 storage parts are provided, and the locking piece 2 connects the guide rail 8 and the groove 5 into which the guide rail 8 fits between the opposing inner wall surface of the box 4 and the back surface of the portion of the locking piece 2 located inside the box 4. The locking pieces 2 are formed on the outer surfaces of the leg pieces 9 which are hung vertically astride so as to lock the locking pieces 2 to the locking portions of the box 4 and to slide in the horizontal direction.
A protrusion 7 is placed on a shelf at the center of the side located inside the box 4, and a height that is approximately equal to or slightly lower than the lower surface of the protrusion 7 of the locking piece 2 is provided at the center of the bottom surface inside the box 4. A commercially available padlock 10 is attached to the lower side of the back surface of the protrusion 7 and has a locking bar 6.
The case 4 is provided with a cover 3 which protrudes so as to have a space into which a lock lever forming an inverted J-shape can be inserted, and which closes the opening after storing the main body of the padlock 10 in the case 4. A locking device for a manhole cover, characterized in that it is attached to a manhole cover. 2. The box 4, which has an open top surface and is shaped like a cube, is provided with a locking portion of the locking piece 2 that projects horizontally from the top surface of the box 4, and a storage portion for the padlock 10 for fixing the locking piece 2. The locking piece 2 has a boss 12 having a through hole through which the shaft is inserted, vertically provided on the back surface of the portion of the locking piece 2 located inside the box 4, and is rotatably mounted between opposing side walls of the box 4. A protrusion 7 is placed on the center of the side of the locking piece 2 located inside the box 4, and a commercially available padlock 10 is placed on the lower surface of the protrusion 7 of the locking piece 2 at the center of the bottom of the case 4.
A locking rod 6, which has a stepped portion to form a cavity into which the locking rod can be inserted, and in which the locking rod is locked, is raised so that its upper end is located near the tip of the protrusion 7 of the locking piece 2,
The locking device for a manhole cover is further characterized in that after the main body of the padlock 10 is stored in the box 4, a cover 3 for closing the opening of the box 4 is attached to the box 4 so as to be openable and closable.