JPH05336637A - Locking mechanism - Google Patents

Abstract

PURPOSE:To simply and surely release locking and remove a cover by providing a guide part, which releases the hold of a mobile arm and also guides a cover so as to separate it from the body, at the projection on cover side. CONSTITUTION:When a lock member 20 is slid in lock condition, a mobile arm (lock arm) 30 is bent and deformed by the guide parts 19a and 19b of the salient wall 19 on cover side, and the engagement between a cover 14 and the body 12 is released. And, when the lock member 20 is further slid, the wedge part 33 of the mobile arm 30 cuts in between the salient wall 17 on body side and the salient wall 19 on cover side by the elastic restitutive force of the mobile arm 30, and the force of pulling the cover apart from the body 12 occurs by its wedge action, and the cover 14 is pulled apart from the body. Hereby, the release of the lock and the removal of the cover can be performed simply and surely merely by operating it from above (as indicated by the arrow).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock mechanism applied to a fuse box or the like, and more particularly to a lock mechanism capable of easily releasing a locked state.

[0002]

2. Description of the Related Art Conventionally, as an example of an electric junction box equipped with this type of lock mechanism, those shown in FIGS. 5 and 6 are known (Japanese Utility Model Publication No. 2-83619 and Japanese Utility Model Publication No. 63-418).
48). This electrical junction box comprises a main body 1 and a cover 3 that covers the opening 2 of the main body 1, and has a lock mechanism 4 for locking the main body 1 and the cover 3 on the side wall portion.

The locking mechanism 4 comprises a seesaw-shaped locking plate 5 whose central portion is supported on the side wall of the cover 3, and an engaging projection 6 provided on the side wall of the main body 1 for locking. Board 5
The engaging portion 7 at the tip of the
The lock state is achieved by engaging with. In addition, FIG.
As shown in FIG. 4, the operating portion 8 at the base end of the locking plate 5 is tilted in the direction A with a finger to displace the distal end of the locking plate 5 outward, and in this state, the cover 3 is lifted to release the lock. Becomes Since the lock mechanism 4 projects from the side wall, ribs 9 are provided on both sides of the lock mechanism 4 to prevent damage.
9 is provided.

[0004]

In the above-mentioned conventional lock mechanism 4, the lock 3 cannot be unlocked and the cover 3 cannot be removed unless the cover 3 is lifted while the operation portion 8 of the locking plate 5 is tilted with a finger. , Work was hard to do. In particular, as shown by the chain double-dashed line in FIG. 5, in the case of a large cover, it is difficult to grip the cover 3 by hand, which may make work difficult. Further, as shown in FIG. 7, when another obstacle P is near, the unlocking operation cannot be performed unless the finger is put sideways, which may make the work very difficult.

In view of the above circumstances, the present invention provides a lock mechanism that can be unlocked and the cover can be easily and reliably removed even if there is an obstacle nearby by simply operating from above. The purpose is to

[0006]

The locking mechanism of the present invention comprises:
In a lock mechanism capable of locking and unlocking the main body and the cover together, the side walls of the main body and the cover are provided with projecting wall portions facing each other when the main body and the cover are combined. , A lock member that is slidable along the side surface portion is supported on the side surface portion of the cover, and the lock member is engaged with both the projecting wall portions in a state where the main body and the cover are combined, and cannot be removed. A pair of flexible arms to be gripped on the flexible arm, a wedge portion is provided on the flexible arm, and the projecting wall portion on the cover side cooperates with the wedge portion when the lock member is slid to the main body side. A guide part is provided for releasing the grip of the flexible arm and for guiding the cover by separating it from the main body side wall part and the cover side wall part by the elastic restoring force of the flexible arm. .

[0007]

In the lock mechanism of the present invention, when the lock member is slid in the locked state, the flexible arm is flexibly deformed by the guide portion of the cover-side protruding wall portion, and the engagement between the cover and the main body is released. .. Then, when the lock member is further slid, the elastic restoring force of the flexible arm causes
The wedge portion of the flexible arm interrupts between the side wall portion of the main body and the side wall portion of the cover, and the wedge action causes a force to separate the cover from the main body, and the cover is separated from the main body.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows details of the lock mechanism 10 of the embodiment. The lock mechanism 10 is provided on the side wall of the fuse box 11.

As shown in FIG. 1A, the fuse box 11 is composed of a main body 12 and a cover 14 that covers the opening of the main body 12, and the L-shaped wall 1 is formed on the upper side surface of the main body 12.
5 is provided, and the L-shaped wall 15 is provided on the side surface of the cover 14.
A guide frame 16 is provided opposite to the guide frame 16.

The L-shaped wall 15 has a protruding wall portion 17 on the main body 12 side as shown in FIG. 1B on the inner surface of the wall portion 15a parallel to the side surface of the main body 12. The projecting wall portion 17 has a rectangular cross section, the upper end edge thereof is flush with the upper edge of the main body 12, and the lower end corner portions 17a, 17a are slightly sharply cut. The both corner portions 17a, 17a are portions that function as engaging portions that engage with the lock arm 30 described later. Further, both upper end corner portions 17b, 17b of the projecting wall portion 17 are formed substantially at right angles.

The guide frame 16 has a U-shape when viewed from above, and the lock member 20 is housed inside. The lock member 20 is slidable in the vertical direction (the direction indicated by the symbol B in FIG. 1) along the left and right inner side walls of the guide frame 16, and the guide protrusions 21 provided on both left and right sides of the lock member 20.
Are engaged with the vertical grooves 18 formed on the left and right inner side walls of the guide frame 16, so that they are guided by the vertical grooves 18 and smoothly slide up and down.

The guide frame 16 is an isosceles triangular cover 1 on the lower inner surface of the wall portion 16a parallel to the side surface of the cover 14.
It has a protruding wall portion 19 on the fourth side. The projecting wall portion 19 is formed so that the right and left two oblique sides 19a, 19a face upward, and the bottom side is flush with the lower end edge of the cover 14, and the main body 12 and the cover 14 are combined in an appropriate relationship. At this time, the lower end surface faces the upper end surface of the projecting wall portion 17 on the main body 12 side.
Both corners 19b, 19b at the bottom of the projecting wall 19 are chamfered obliquely, and the chamfered corners 19a, 19a are formed.
Due to this, when the main body 12 and the cover 14 are put together, a triangular space 25 into which a wedge portion 33 described later is inserted is formed at the left and right ends between the projecting wall portions 17 and 19. The oblique side 19a and the chamfered corner portion 19b form a guide portion in this embodiment.

The lock member 20 has lock arms 30, 30 as a pair of substantially parallel flexible arms extending downward. The lock arms 30, 30 are flexibly deformable to the left and right (in the direction indicated by the symbol C in the figure) about the upper end as a fulcrum, that is, flexibly deformable inward and outward, and are strong by their elastic restoring force. It can exert the pinching force. These lock arms 30 and 30 are provided with the protruding wall portions 17 and 19 respectively.
Are arranged to hold.

Each lock arm 30 has an engaging claw 31 at its lower end.
have. When the main body 12 and the cover 14 are properly aligned, the engaging claws 31 engage with the lower end corners 17a and 17a of the main body 12 side projecting wall portion 17 to lock the main body 12 and the cover 14. It is a thing. When the main body 12 and the cover 14 are fitted to each other, the protruding wall portion 1 is attached to the lower end of the engaging claw 31.
The upper end corners 17b and 17b of the inclined surface 31a are formed.

A wedge portion 33 is further formed in the middle stage of the lock arm 30. The wedge portion 33 is formed on the inner side surface of the lock arm 30 as a protrusion having a substantially triangular side view. The wedge portion 33 is formed on the lock arm 3
It is located on the oblique side 19a of the protruding wall portion 19 when the 0 and the protruding wall portion 17 are engaged with each other. At this time, the upper end of the lock member 20 is substantially flush with the upper surface of the cover 14. The wedge portion 33 slides along the oblique side 19a of the protruding wall portion 19 as the lock member 20 slides toward the main body 12, and finally, the triangular space formed by the protruding wall portion 17 and the protruding wall portion 19. It fits in 25.

In addition to the above construction, a window 41 is formed on the front surface of the guide frame 16 and a notch 42 is formed on the side surface thereof, and a hole 43 for facilitating the pushing of the lock member 20 is formed inside the guide frame 16. Has been formed.

Next, the operation will be described.

First, when locking, the cover 14 is fitted to the main body 12. In this state, the lock member 20, which is previously installed on the cover 14 side, is pushed toward the main body 12 side.

Then, the sloped surface 31a of the tip end of the lock arm 30 hits the upper end corner portion 17b of the projecting wall portion 17 of the main body 12, whereby the lock arm 30 is pushed open,
The locking claw 31 passes through the protruding wall portion 17. When the locking claw 31 passes through the projecting wall portion 17, at that moment, the locking claw 31 elastically restores inward, and the locking claw 31 engages with the lower end corner portion 17a of the projecting wall portion 17. .. At this time, the wedge portion 33 covers the cover 1
Since it abuts the hypotenuse 19a of the protruding wall portion 19 on the fourth side, the protruding wall portion 1 of both sides is provided between the wedge portion 33 and the locking claw 31.
7, 7 and 19 are sandwiched, and the protruding wall portions 17 and 1 are engaged.
9 cannot be detached, and the main body 12 and the cover 14 are locked.

Next, when releasing the lock, the lock member 20 is pushed toward the main body 12 side as shown in FIG. As a result, the wedge portion 33 becomes the oblique side 19 of the projecting wall portion 19.
By sliding a, the lock arm 30 is opened outward by the guiding action of the oblique side 19a, the locking claw 31 at the lower end of the lock arm 30 is disengaged from the lower end corner portion 17a of the projecting wall portion 17, and the engaged state is It will be canceled.

When the lock member 20 is further pushed in as it is, as shown in FIG. 3, the wedge portion 33 slides on the oblique side 19b of the projecting wall portion 19, and the projecting wall portion 19 on the cover 14 side and the projecting wall portion on the main body 12 side. Triangular space 2 secured between section 17
Reach 5.

When the pushing operation is stopped while the wedge portion 33 reaches here, the force for opening the lock arm 30 disappears, and the lock arm 30 returns to the closing direction by its own elasticity, and the restoration at that time is restored. The wedge portion 33 is pushed by force to both the projecting wall portions 1.
A wedge action is generated by cutting in between 7 and 19, and a force for separating the cover 14 from the main body 12 is generated.

At this time, the locking claw 3 of the lock arm 30 has already been
1 and the projecting wall portion 17 on the main body 12 side are disengaged from each other, the cover 14 causes the main body 1
Lifted from 2. Therefore, the cover 14 is lifted when the lock is released, and the cover 14 is easily and surely removed. In this case, the release operation is
Since the lock member 20 only needs to be pushed in, even if there is an obstacle in the vicinity or a large cover that cannot be grasped by hand, the cover 14 can be easily operated.
Can be removed.

[0025]

As described above, according to the lock mechanism of the present invention, the cover can be pulled away from the main body at the same time as unlocking by simply sliding the lock member. Therefore, even if there is an obstacle nearby or the cover is large, the cover can be easily and reliably removed from the main body by sliding the lock member from above.

[Brief description of drawings]

FIG. 1 shows a configuration of a lock mechanism according to an embodiment of the present invention,
(A) figure is a perspective view which shows the external appearance of a lock mechanism, (b) figure is Ib-Ib arrow sectional drawing of (a) figure.

FIG. 2 is a sectional view showing a state of a first stage of a releasing operation of the lock mechanism of the embodiment.

FIG. 3 is a cross-sectional view showing the beginning state of the second stage of the unlocking operation of the lock mechanism of the embodiment.

FIG. 4 is a sectional view showing the state at the end of the second stage of the releasing operation of the lock mechanism of the embodiment.

FIG. 5 is an external view of an electrical junction box including a conventional lock mechanism.

FIG. 6 is a cross-sectional view of a conventional lock mechanism.

FIG. 7 is a sectional view for explaining a releasing operation of a conventional lock mechanism.

[Explanation of symbols]

 10 Lock Mechanism 12 Main Body 14 Cover 17 Projection Wall Part 17a Lower End Corner (Main Body Side Engagement Part) 19 Projection Wall Part 19a Oblique Side (Guide) 19b Corner (Guide) 20 Lock Member 25 Triangular Space 30 Lock Arm (possible) Flexible arm 31 Locking claw 33 Wedge

Claims (1)

[Claims] 1. A lock mechanism capable of locking and unlocking a main body and a cover in a combined state, and a protrusion that faces each side portion of the main body and the cover when the main body and the cover are combined. Each of the wall portions is provided, and a lock member that is slidable along the side surface portion is supported on the side surface portion of the cover, and the lock member is attached to both of the projecting wall portions in a state where the main body and the cover are combined. Providing a pair of flexible arms for engaging and non-releasing grips, and the flexible arms,
A wedge portion is provided, and when the lock member is slid on the main body side, the wedge portion cooperates with the wedge portion to release the grip of the flexible arm and the elastic restoring force of the flexible arm. The locking mechanism is characterized in that a guide portion is provided between the side wall portion of the main body and the side wall portion of the cover to guide the cover to be separated from the main body.