JPS5832714Y2 - Box lid locking device - Google Patents

Description

[Detailed description of the invention] This invention is mainly used in cases where a lid is provided on the front and back of the box, such as a milk box or a mail box, so that items inserted through one entrance can be taken out from the other exit. This invention relates to a locking device for a box lid, in which the front lid is automatically locked by the opening/closing operation of the lid, and the front lid is unlocked by the opening operation of the back lid.

Conventional devices of this type have a swinging bottom plate on the bottom of the box body that locks the lower back of the top plate at the front end, and the swinging bottom plate changes the center of gravity by placing the object stored in the box in a predetermined position. Since it had a structure in which the front cover was locked by the operation of the bottom plate, there was a drawback that it could not be locked unless the contents were placed in a predetermined place.

In this invention, a front cover and a back cover are attached to the front and back sides of the box body, which can be opened and closed freely with hinged upper edges, and a lever is provided that swings along the bottom side of the box body. A contact element is provided at the end of the lever that swings the lever in response to the opening operation of the camera back, while an elevating rod whose lower end is hinged is connected to the front end of the lever. A magnet that attracts the above-mentioned lifting rod in its raised position is rotatably installed in the box body, and
A contact portion is provided which contacts the magnet during the opening operation of the back cover and rotates it to release the elevating lever to which the magnet is attracted, and a contact portion between the front end of the lever and the lower back surface of the front cover is provided. By providing mutually removable hooks in between, the front cover can be automatically locked regardless of the location of the stored object, and the locked state can be changed by opening the back cover to take out the stored object. This provides a locking device for a box lid that can be unlocked.

The embodiment will be explained below with reference to the drawings. B is a cubic box body, 1 is a front cover, 2 is a back cover, and 3 is a fulcrum 4 on the bottom side of the box body B, which is horizontally mounted in the front and back direction of the box. The lower end of lever 5 is hinged to the rear end 3' of lever 3, and the middle part is attached to the box body B.
A contact 6 is supported on the inner surface of the lever 3, and when the back cover 2 is opened, its upper end is pushed down by the upper edge 2' of the opening cover 2 to push down the rear end 3' of the lever 3. The lower end is hinged at ``, and the middle part is supported on the inner surface of the box body B, 6' is the suction part at the upper end of the elevator rod 6, and 7 is the elevator rod 6.
Above, a magnet 9 hinged to the inner surface of the main body B via a fulcrum 8 is provided on the upper back surface of the front cover 1,
A contact portion 10 that contacts the magnet 7 and rotates it during the opening operation of the lever 3 is a hook 10a formed downward at the front end 3'' of the lever 3, and a hook 10a formed downward at the front end 3'' of the lever 3, and an upwardly directed hook 10a projected from the lower back surface 1' of the front cover 1. This is a hook part consisting of a hook 10b that can be engaged and detached from each other.

In the figure, reference numeral 11 indicates that when the top cover 1 is opened, the magnet 7 rotates due to the contact of the abutting portion 9, and is attracted to the magnet 7 and fixed in its rotational position. A locking piece Ba provided on the inner surface of the box body B for temporarily fixing the open position is the entrance of the box, and Bb is an exit of the box.

Next, the locking and unlocking operations of this embodiment constructed as described above will be explained together with the use of the box body B.

In the state shown in FIG. 1, that is, when the rear end 3' of the lever B is down, the front end 3'' of the lever 3 is rising together with the lifting rod 6, and the lifting rod 6 is attracted to the magnet 7. Therefore, the hook 10a on the front end 3'' of the lever is open, and the front cover 1 can be opened.

Next, when the front cover 1 is opened to put in the stored items, the front end of the contact part 9 forcibly rotates the magnet 7 by opening the front cover 1, releasing the attraction of the lifting rod 6, and The magnet 7 is attracted to the stopper piece 11, and the top cover 1 is held in its open position as shown in FIG.

- The lifting rod 6, which has been released from the front suction, moves down together with the front end 3'' of the lever 3 due to its own weight, and positions the hook 10a in the lowered position where it can be locked.

Next, when the stored items are put into the main body B and the front cover 1 is closed, the magnet 7 is returned to its position due to the friction of the abutment part 9 that rotates together with the magnet 7, and at the same time, the hook 10b on the lower back surface 1' of the open cover 1 is After the hooks 10a of the front end 3'' of the lever are pushed up a little, they fit together and the hooks 10 keep the front cover 1 in a locked state as shown in FIG.

When you open the back cover 2 to take out the contents inside the box,
As a result of the opening operation, the contact 5 is pushed down together with the rear end 3' of the lever 3, and conversely, the lifting rod 6 rises together with the front end 3'' of the lever and is again attracted to the magnet 7, which locks the top cover 1 with the hook 10. By opening the case and closing the back cover 2, the state shown in FIG. 1 is returned.

The present invention, which is constructed as described above and used in the manner described above, allows the locking and unlocking of the front cover to be related to the opening operations of the front cover and back cover, regardless of the location of the items stored in the box. Since the locking mechanism is operated by swinging a lever, its operation is reliable, and it is particularly suitable for locking devices for milk boxes or mailboxes.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and are shown in Figures 1 to 4.
The figures are partially cutaway elevational views showing the locked and unlocked states of the embodiment in the order of operation. B...Box body, Ba...Entrance, Bb.
...Exit, 1...Top lid, 1'...
・Lower back surface, 2...Back cover, 2'...Top edge, 3...Lever, 3'...Rear end, 3
″...front end, 4...fulcrum, 5...
...Contact, 6...Lifting rod, 6'...
Adsorption part, 7... Magnet, 8... Fulcrum, 9
..... Contact part, 10 .... Hook part, 10 a
, 10 b... hook, 11... hanging piece.

Claims (1)

[Scope of utility model registration request] A front cover 1 and a back cover 2, which can be freely opened and closed, are attached to the front and back surfaces of the box body B, and the upper edges of each are hinged, and a lever 3 that swings along the bottom side of the box body B is provided. A contact 5 is provided at the rear end 3' to swing the lever 3 as the back cover 2 is opened, and a lifting rod 6 whose lower end is hinged is connected to the front end 3'' of the lever 3. A magnet 7 is rotatably provided on the upper back surface of the front cover 1 to attract the lifting rod 6 in its raised position, which is raised by the opening operation of the back cover 2. A contact part 9 is provided that contacts the magnet 7 during operation to rotate it and release the lifting rod 6 to which the magnet 7 is attracted, and also provides a contact part 9 that contacts the front end 3'' of the lever 3 and the lower part of the top cover 1. A locking device for a box lid, characterized in that a hook portion 10 that can be engaged and detached from each other is provided between a back surface 1'.