JP2002111244A - Lock mechanism of cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock mechanism of a cover which is excellent in design, does not require assemble adjustment and is free from the fear that a lock comes off due to vibration, or the like. SOLUTION: In order to close an opening part of a housing 9 almost an entirety of one surface of which is almost opened, the mechanism is provided with hooks 4a, 4b projected to lower both ends of a cover 1, hanging holes 11a, 11b which are shaped in the housing 9 and can be fit to the hooks 4a, 4b, a lock arm 2 which is provided to a rear side of the cover 1 and can be rotated in a plane parallel with a rear, engagement parts 8a, 8b which are provided to both ends of the lock arm 2, engagement holes 10a, 10b which are shaped in the housing 9 and engage with the engagement parts 8a, 8b, a positioning boss 7 which is shaped in a rear of the cover 1, a positioning hole 12 which is shaped in the housing 9 and fits to the positioning boss 7, etc. The engagement part 8a has an engagement projection part which projects downward, and the engagement part 8b has an engagement projection part which projects upward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock mechanism for a cover, and more particularly, to a lock mechanism used for a maintenance cover of a box-shaped housing such as an exchanger.

[0002]

2. Description of the Related Art Conventionally, in order to fix a cover attached to a box-shaped housing such as a housing of an exchange, for example, FIG.
As shown in (2), after the hook 53 of the cover 51 is hooked on the hook fitting hole 55 of the housing 54, the cover 51 is fixed by the screw 52.

As another method, as shown in FIG. 8, a hook 64 of a cover 61 is hooked on a hook fitting hole 69 of a housing 67, and then the cover 61 is brought into close contact with the housing 67 using the hooked portion as a fulcrum. Operation unit 6
6 to rotate the lock arm 62 in the locking direction (the direction of the arrow A) via the spring 65 so that the fitting portion 63 is
The cover 61 was fixed to the housing 67 by fitting it into the fitting hole 68 of No. 7.

[0004]

However, in the first conventional example, since the cover 51 is fixed to the housing 54 via the hooks 53 and the screws 52, the exposed screws 52
There is a problem that it is difficult to make the image invisible, and the design is inferior. Here, screw 5
If a method using a ball catch is adopted instead of fixing with 2, the cover 51 may come off due to vibration.

On the other hand, in the second conventional example, since the spring 65 is provided, it is necessary to adjust the assembly when assembling the cover 61 and the housing 67, and at the same time, there are two or more lock portions (the engagement portion 63 and the engagement portion 63). Locking in the combination with the fitting hole 68) may be insufficient, or the lock may be released due to vibration or the like.

In view of the above, the present invention has been made in view of the above-mentioned problems in the conventional lock mechanism of the cover, and has excellent design properties, does not require assembly adjustment, and does not have a possibility of being unlocked due to vibration or the like. An object of the present invention is to provide a cover locking mechanism.

[0007]

According to a first aspect of the present invention, there is provided a lock mechanism for a cover for closing an opening of a housing having a substantially open whole surface. Projecting at both lower ends of the lower part, and a hook protruding downward, and a hole is formed in a surface of the housing having the opening,
A hook hole engageable with the hook, a lock arm provided on the back surface side of the cover and rotatable in a plane parallel to the back surface, and a fitting provided at one end of the lock arm and projecting upward A first fitting portion having a projecting portion, a second fitting portion provided at the other end of the lock arm and having a fitting projecting portion protruding downward, and perforated on a surface of the housing having the opening. , The first and second lock arms
A fitting hole for fitting with the fitting portion, a positioning boss protruding from the back surface of the cover, and a positioning hole formed on the surface of the housing having the opening and engaging with the positioning boss. It is characterized by.

According to the first aspect of the present invention, the operation of opening and closing the lock can be performed by rotating the lock arm, so that assembly adjustment when assembling the housing with the cover is unnecessary, and the lock arm is rotated. Can be provided at one place, and the design of the operation section is improved because of a high degree of freedom in the layout of the operation section.

Further, since the cover is vertically locked to the housing by the first fitting portion and the second fitting portion provided at both ends of the lock arm, the lock state is reliable and resistant to vibration and the like. And it is difficult for the difference between the hooks of the two hooks of the cover to the hook holes of the housing to appear.
The hook is hard to come off.

[0010] Furthermore, since no springs or screws are used as in the conventional case, the number of parts can be reduced.

According to a second aspect of the present invention, in the lock mechanism of the first aspect, the lock arm rotates in a direction in which the first fitting portion and the second fitting portion fit into the fitting holes. And a biasing means for biasing the lock arm.

According to the second aspect of the present invention, after the hooks at the lower end portions of the cover are hooked into the hook holes, the cover is automatically rotated only in the direction in which the cover is in close contact with the housing, and the first mating portion and the cover are automatically rotated. The second fitting portion can be fitted into the fitting hole.

[0013]

Next, a specific example of an embodiment of a cover locking mechanism according to the present invention will be described with reference to the drawings.

FIGS. 1 to 5 show an embodiment of a cover locking mechanism according to the present invention. The cover locking mechanism is provided for closing an opening of a housing 9 which is open substantially on one side. , Hooks 4 protruding from both lower ends of the cover 1
a, 4b, hook holes 11a, 11b formed in the housing 9 and engageable with the hooks 4a, 4b, and a lock arm provided on the back side of the cover 1 and rotatable in a plane parallel to the back side. 2 and fitting portions 8 provided at both ends of the lock arm 2
a, 8b, perforation holes 10a, 10b perforated in the housing 9 and pertaining to the perforations 8a, 8b, positioning bosses 7 protruding from the back surface of the cover 1, and perforated in the housing 9, A positioning hole 12 and the like that engage with the positioning boss 7 are provided.

As shown in FIG. 1, the housing 9 has an opening substantially on the entire front surface, and has a longitudinally elongated left and right front surface of the opening. 8a, 8b, and fitting holes 10a, 10b, and hooks 4a, 4b, hook holes 11a, 11b, respectively.
And positioning holes 1 for fitting with positioning bosses 7 of cover 1
2 is drilled.

The cover 1 has two hooks 4a and 4b at the lower part to cover the front opening of the housing 9, and has a positioning boss 7 at the upper part for positioning the cover 1 and the housing 9. Further, a lock arm 2 that rotates with the screw 3a as a fulcrum is provided on an upper portion of the cover 1.

The lock arm 2 is mounted on the cover 1 via screws 3a to 3c as shown in detail in FIG. The lock arm 2 has a round hole 2a corresponding to the screw 3a.
And long holes 2b, 2c long in the vertical direction are formed in positions corresponding to the screws 3b, 3c. As a result, as shown in FIG.
When rotated in the direction, the fitting portion 8a rotates in the direction of arrow C, and the fitting portion 8b rotates in the direction of arrow D.

As shown in FIG. 2, an operation unit 6 for rotating the lock arm 2 is provided on the lock arm 2.
Female screw 2 screwed into lock arm operation limiting screw 5
d is screwed. The operation unit 6 is inserted into a slit 1 b formed in the cover 1 and is exposed outside the cover 1. At both ends of the lock arm 2, fitting portions 8a and 8b, which will be described in detail below, protrude.

Next, the engagement portions 8a and 8b of the lock arm 2 will be described in detail with reference to FIGS.

FIGS. 4 (a) to 4 (d) show the vicinity of the fitting portion 8b, the vicinity of the hook 4b,
It is sectional drawing which shows only the vicinity of the fitting part 8a and the hook 4a.

As shown in FIG. 4A, the fitting portion 8b of the lock arm 2 has a fitting projecting portion projecting downward and is movable in the direction of arrow E. The fitting portion 8b fits downward with respect to the housing 9 similarly to the hooks 4a and 4b. On the other hand, the fitting portion 8a has a fitting protrusion that protrudes upward, is movable in the direction of arrow F, and only the fitting portion 8a fits upward. The difference between these fitting directions is that the lock arm 2 is of a rotary type.

With the above configuration, the fitting portion 8a and the hook 4
The lock formed on the side constituted by the hooks 4b is securely engaged with the body 9 in the vertical direction, but the lock formed on the side constituted by the fitting portions 8b and the hooks 4b is hooked on the housing 9 in the same direction. And is not locked by the housing 9. Therefore, in order to position the cover 1 and the housing 9 and to form a lock relationship, a positioning boss 7 is provided at a position facing the fitting portion 8b, and as shown in FIG. The boss 7 is configured so that the portion of the housing 9 between the fitting hole 10a and the positioning hole 12 can be bitten and locked.

In fixing the lock arm 2, as shown in FIG. 5, a lock arm operation limiting screw 5 which penetrates the cover 1 and is fixed to the lock arm 2 is used. That is, since the screw hole 1a formed in the cover 1 is a long hole in the longitudinal direction, the lock arm operation restriction screw 5 is loosened to change its position, and the lock arm operation restriction screw 5 is tightened again. The position of the lock arm 2 can be changed.

Next, the operation of the cover locking mechanism having the above configuration will be described in detail.

First, referring to FIG.
The hooks 11a and 11b of the housing 9 are hooked on the hooks 11a and 11b, respectively, and the cover 1 is rotated about the hooked portions as a center of rotation so that the cover 1 is brought into close contact with the housing 9. At this time, the positioning boss 7 of the cover 1 is
And the hook 8 of the lock arm 2
a and 8b are inserted into the hook fitting holes 10a and 10b of the housing 9.

Next, when the operating portion 6 of the lock arm 2 is operated to rotate the lock arm 2 around the screw 3a, the fitting portions 8a, 8b of the lock arm 2 are fitted into the fitting holes 10b, The cover 1 is locked to the housing 9 by fitting into each of 10a. Thereafter, when the lock arm operation restricting screw 5 is tightened, the lock arm 2 is tightened together with the cover 1, and
The lock arm 2 becomes immobile, and the fixing operation of the cover 1 is completed.

As described above, in the cover locking mechanism according to the present invention, the housing 9 can be securely locked in the hook shape in the vertical direction by making the lock arm 2 rotatable. A lock mechanism that is strong against vibrations and the like is realized by the bite of the horn.

Further, the lock arm 2 is provided with a fixing screw 3a.
, The force applied to the two locks on the left and right sides is substantially uniform, and the arrangement of the operation unit 6 on the lock arm 2 has a high degree of freedom. This is also advantageous in terms of mechanism design.

In the above-described embodiment, the lock arm 2 is rotated via the operation unit 6. However, as shown in FIG. Can be performed using the spring 13 as the urging means.

With this configuration, the hooks 4a, 4b
Is inserted into the hook fitting holes 11a and 11b of the housing 9 (see FIG. 1), and the cover 1 is rotated and moved so as to be in close contact with the housing 9, whereby the lock arm 2 is forcibly moved in the lock opening direction. And the fitting portions 8a and 8b of the lock arm 2
The lock closed state can be created by the spring 13 at the same time as fitting into the fitting holes 10 a and 10 b of the housing 9.

[0031]

As described above, according to the present invention,
It is possible to provide a cover locking mechanism which is excellent in design, does not require assembly adjustment, does not have a possibility of being unlocked due to vibration or the like, has a small number of parts, and can improve productivity.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view for explaining the entire configuration of an embodiment of a cover locking mechanism according to the present invention.

FIGS. 2A and 2B are exploded perspective views illustrating a component configuration of a cover of a lock mechanism of the cover of FIG. 1, wherein FIG. 2A is viewed from the outside of the cover, and FIG. Indicates the status.

FIG. 3 is a perspective view for explaining a rotation operation of a lock arm of a lock mechanism of the cover of FIG. 1;

FIG. 4 is a cross-sectional view for explaining a locking operation of a cover locking mechanism of FIG. 1;

FIG. 5 is a sectional view showing a lock arm operation restricting portion of the lock mechanism of the cover of FIG. 1;

FIG. 6 is a perspective view showing another embodiment of the cover locking mechanism according to the present invention.

FIG. 7 is an exploded perspective view showing an example of a conventional cover lock mechanism.

FIG. 8 is an exploded perspective view showing another example of the conventional cover lock mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover 1a Screw hole 1b Slit 2 Lock arm 2a Round hole 2b Slot 2c Slot 2d Female screw 3a Lock arm fixing screw (center of rotation) 3b, 3c Lock arm fixing screw (slide) 4a, 4b Hook 5 Lock Arm operation limiting screw 6 Operating part 7 Positioning boss 8a, 8b Fitting part 9 Housing 10a, 10b Fitting hole 11a, 11b Hook fitting hole 12 Positioning hole 13 Spring

Claims (2)

[Claims] 1. A lock mechanism for a cover that closes an opening of a casing that is open on substantially one entire surface, wherein a hook protruding from both lower ends of the cover and protruding downward is provided; A hook hole drilled in a surface of the body having the opening and engageable with the hook; a lock arm provided on a back surface side of the cover and rotatable in a plane parallel to the back surface; A first fitting portion provided at one end of the arm and having a fitting projection projecting upward; a second fitting portion provided at the other end of the lock arm and having a fitting projection projecting downward; A fitting hole drilled in a surface of the housing having the opening and fitting the first and second fitting portions of the lock arm; a positioning boss protruding from a back surface of the cover; Perforated in the surface having the opening, the positioning Cover locking mechanism, characterized in that it comprises a positioning hole that scan engage. And a biasing means for biasing the lock arm so that the lock arm rotates in a direction in which the first fitting portion and the second fitting portion fit into the fitting hole. The cover locking mechanism according to claim 1, wherein