JPH04331410A - Structure of small-sized case with locking mechanism - Google Patents

Abstract

PURPOSE:To provide the easily locked and unlocked structure of a case, concerning the locking mechanism-provided case which is suitable for housing a small- sized communication appliance. CONSTITUTION:A movable member 9 having a pawl which can be fit in with recessed part 2 of a cover 1 is housed in a square hole 8 of a base 3. By allowing an unlocking pin 13 to work on a funnel hole 12 made in the movable member 9 through a stopping hole 11 made in the base, the movable member 9 is made to move and thereby the locking is canceled.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small case with a locking mechanism suitable for housing communication equipment used in telephone line repeaters and the like.

0002

2. Description of the Related Art As shown in FIG. 6, a telephone subscriber line relay device 20 has a printed circuit board 22 mounted with an electronic circuit component 21 mounted on a base 23, and a box-shaped cover 24 inserted into the base 23 from above. It is constructed in a sealed manner and is fixed to the wall of a house or the like with screws 25. Such a device 20 is locked by passing a ring 26 through a hole provided in the lower edge of the cover 24 and the base 23 so that the cover 24 cannot be opened by a third party for security reasons.

0003

[Problems to be Solved by the Invention] Therefore, when it is necessary to access the printed circuit board 22 inside the case for maintenance or the like, it is necessary to cut the locking ring 26 and then open the cover 24 and perform the work. After the process is completed, the lock must be re-locked with a new ring, which is time-consuming.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the prior art and to provide a structure for a case for a small communication device that can be easily locked and unlocked.

[0005]

[Means for solving the problem] This purpose is based on
A small case consisting of a box-shaped cover that is attached to the base and forms a sealed space between the base and the inner wall of the cover,
A horizontal square hole with a predetermined depth is provided on both sides of the base, and a movable member that is slidably fitted into the square hole is accommodated, and the tip of the movable member is attached to the square hole. When viewed from the insertion direction of the cover, the downstream side thereof forms a claw having an inclined surface projecting forward from the upstream side, and the movable member has a claw that slightly protrudes from the outlet of the square hole in an unloaded state. The cover is elastically supported by a spring installed at the back of the square hole so that the cover occupies the same position; Further, the base is provided with a locking hole that vertically passes through the square hole and has an opening on the bottom surface of the base, while the movable member has a locking hole that vertically traverses the body. a lower open funnel hole is provided;
The positional relationship between the locking hole and the funnel hole is such that when the tip of the claw of the movable member is completely retracted into the square hole, the center lines of the locking hole and the funnel hole are completely aligned with each other. The upper and lower portions of the locking hole communicate through the funnel hole, and when the claw protrudes outward, the portion of the locking hole below the square hole matches the tapered portion of the funnel hole, The parts above the square hole do not match; and the locking mechanism is further provided with a lock release pin that can be inserted into the locking hole through an opening in the lower surface of the base. This is achieved by the structure of a small case.

[0006]

[Operation] To attach the cover to the base, press the cover against the base while bringing the side edge of the cover into contact with the inclined surface of the claw of the movable member protruding from the side of the base. Then, the movable member is pushed by the inner wall of the side surface of the cover and withdraws into the square hole against the biasing force of the spring. When the cover is completely pushed into the base, the recess in the inner wall of the cover matches the square hole, the movable member projects outward again, and the tip of the claw engages with the recess. This completely locks the cover in position.

To remove the cover from this state, first insert the lock release pin into the locking hole and push it up. Then, the tip comes into contact with the funnel-shaped tapered part of the funnel hole of the movable member, and a horizontal component force is exerted on the movable member, which moves it toward the back of the square hole against the urging force of the spring. let Finally, it enters the upper part of the locking hole to completely align the locking hole and the funnel hole.

[0008] This allows the claws of the movable member to separate from the recesses of the cover, making it possible to remove the cover from the base. Hereinafter, based on the preferred embodiment shown in the drawings,
The present invention will be explained in more detail.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an exploded perspective view showing the appearance of an embodiment of the case structure of the present invention. The cover 1 has a box shape with an open bottom, and has recesses 2 in the lower end regions of the inner walls on both sides thereof. The base 3 consists of a mounting part 3a for fixing to a wall or the like with screws 4, and a pedestal part 3b extending horizontally from the mounting part 3a, on which a printed circuit board 6 on which an electronic circuit component 5 is mounted is mounted vertically. The cover 1 is configured to be fitted onto the outer peripheral surface of the pedestal portion 3b. Claws 7, which will be described later and can be engaged with the recess 2, protrude from both side surfaces of the base portion 3b.

[0010] This configuration will be explained in more detail. As shown in FIG. 2a, the pedestal portion 3b of the base 3 is provided with horizontal holes (hereinafter referred to as square holes 8) with a predetermined depth and a square cross section on both sides thereof. A movable member 9 of the form is slidably fitted. The distal end of the movable member 9 forms the pawl 7, which is an inclined surface with the lower part protruding forward than the upper part, while the rear end is connected to the back of the square hole 8 via a spring 10, and the pawl does not function under no load. The inclined surface 7 is elastically supported so as to protrude outward from the square hole 8.

A locking hole 11 is provided in the center of the square hole 8, passing through it vertically, and a portion 11a of the locking hole located below the square hole has an opening in the lower surface of the base portion 3b. have. On the other hand, a portion 11b above the square hole of the locking hole 11
is a blind hole. A funnel-shaped through hole (hereinafter referred to as funnel hole 12) that vertically penetrates the body of the movable member 9 and expands downward.
) is provided.

To explain the positional relationship between the locking hole 11 and the funnel hole 12, as shown in FIG. do not match, and the lower part 11a of the locking hole 11 faces the region of the tapered surface of the funnel hole 12, while the upper part 11b occupies a position offset from the small diameter part of the funnel hole 12. Then, as shown in FIG. 2b, the claw 7 is connected to the square hole 8.
When the locking hole is retracted inward, the center axes of both holes are completely aligned, and the upper and lower portions 11a and 11b of the locking hole communicate with each other.

In the case of the present invention constructed as described above, in order to attach the cover 1 to the base 3, the steps shown in FIG.
As shown in a, the cover 1 is applied so as to cover the base portion 3b from above. Then, the lower edge of the side wall of the cover 1 first comes into contact with the inclined surface of the claw 7 of the movable member 9 protruding from the square hole 8, and acts to push the movable member 9 into the square hole 8 as it moves further downward.

When the cover 1 is completely pushed down as shown in FIG. 2b, the recess 2 provided in the inner wall of the cover 1 aligns with the square hole 8 of the pedestal 3b, so that the pressing force against the claw 7 is released. Then, due to the urging force of the spring 10, the claw 7 protrudes again and engages with the recess 2. This locks the position of the cover 1. Cover 1 from this state
To remove it, first, as shown in FIG. 4a, the U-shaped lock release pins 13 are simultaneously inserted into the left and right locking holes 11 through the openings on the lower surface of the base portion 3b. Then pin 13
The tip of the square hole 8 of the tapered surface of the funnel hole 12 of the movable member 9
Since the movable member 9 contacts an area near the back of the movable member 9, when the pin 13 is further pushed up, a horizontal force in the pushing direction is applied to the movable member 9. As a result, the movable member 9 enters into the square hole 8 against the urging force of the spring 10, and the claw 7 moves into the recess 2 of the cover.
The lock will be released when it comes off. This allows the cover 1 to be easily removed. This is shown in Figure 4b.

As shown in FIG. 5, the diameter a of the neck portion 13a of the pin 13 is formed to be slightly smaller than the diameter b of the head portion 13b, so that the head portion 13b of the pin fits into the locking hole. Entering the upper part 11b of the movable member 9 (b-a
) in the square hole 8 toward the exit side, and the head 13
b is caught and locked on the edge of the funnel hole 12. This holds pin 13 in that position.

To remove the pin 13 from this state, push in the claw 7 slightly with your finger to completely align the center lines of the funnel hole 12 and the locking hole 11, release the lock, and then remove the pin. All you have to do is pull it out. Although the above description has been made regarding an example in which the cover is attached to the base from above, the present invention is not limited to this, and may similarly apply to a type of case in which the cover is attached to the base from the front. Applicable.

[0017]

According to the present invention, the cover can be reliably locked by the engagement between the claw on the base side and the recess on the cover side, and the claw can be locked by inserting a pin into the locking hole as necessary. It is possible to release the lock by retracting it. This makes it possible to provide a simple case that can be locked safely and reliably and whose interior can be easily accessed as needed.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the appearance of a case of the present invention.

FIGS. 2(a) and 2(b) are half-sectional front views of the case showing the procedure for attaching and locking the cover in the present invention.

FIG. 3 is a perspective view showing the shape of a movable member.

FIGS. 4(a) and 4(b) are half-sectional front views of the case showing the procedure for unlocking the cover in the present invention.

FIG. 5 is a schematic diagram showing the relationship between the diameters of the lock release pin, the locking hole, and the funnel hole.

[Fig. 6] Front view (a) showing the locking structure of a conventional case.
and a side sectional view (b).

[Explanation of symbols] 1...Cover 2...Concavity 3...Base 6...Printed circuit board 7...Claws 8... Square hole 9...Movable member 10...Spring 11...Lock hole 12...funnel hole 13...Lock release pin

Claims (1)

[Claims] 1. A small case consisting of a base (3) and a box-shaped cover (1) attached to the base to form a sealed space between the base and the inner wall of the cover, the case comprising: a base (3);
A horizontal square hole (8) of a predetermined depth is provided on both sides of the square hole (8), and a movable member (9) that is slidably fitted into the square hole (8) is accommodated in the square hole (8). The tip of the member (9) is a claw (7) having an inclined surface with the downstream side protruding forward from the upstream side when viewed from the insertion direction of the cover (1) when installed.
, and the movable member (9) is located at the back of the square hole (8) so that the claw (7) occupies a position slightly protruding from the outlet of the square hole (8) in an unloaded state. Resiliently supported by installed springs (10); on the inner walls of both sides of the cover (1), when the cover (1) is attached to the base (3), the movable member's claws ( 7)
Further, the base (3) is provided with a recess (2) that can be engaged with the square hole (8) vertically through the base (3).
A locking hole (11) having an opening is provided on the lower surface of the movable member (9), and a funnel hole (12) with an open lower part extending vertically across the body is provided in the movable member (9); (11)
The positional relationship between the and the funnel hole (12) is determined by the claw (12) of the movable member.
7) is completely retracted into the square hole (8), the center lines of the locking hole (11) and the funnel hole (12) are completely aligned and the locking hole (11) The upper and lower parts of (11
a, 11b) communicate through the funnel hole (12), and the claw (7
) protrudes outward, the portion (11a) of the locking hole (11) below the square hole is connected to the funnel hole (12).
), but the part above the square hole (
11b) does not match; furthermore, separately,
The locking hole (1) passes through the opening in the lower surface of the base (3).
1) A structure of a small case with a locking mechanism, characterized in that it is equipped with a lock release pin (13) that can be inserted into the case.