JPH0644831Y2 - Box and lid locking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an improvement of a lock device for a box body and a lid body such as an electric connection box arranged in an engine room of an automobile and its waterproof cover.

[Conventional technology]

The electric junction box located in the engine room of the car
It is necessary to cover the waterproof cover in case of inundation when it rains or when washing the car with high-pressure water.

Conventionally, such a box and lid locking device has been
As shown in FIGS. 3 and 4, there is one in which one end of a lock lever b made of a rigid body is pivotally attached to a side wall of a lid a, and one end of a lock plate c is connected to the middle of the lock lever. The lock plate c is formed by bending an elastic metal plate in an arc shape, and has a box e at the other end.
A hook portion d that engages with a protrusion f provided on the side wall of the.

In this locking device, the hook portion d of the lock plate c is connected to the protrusion f.
The lock lever b is pulled down in the direction of the arrow to lock it by utilizing the elastic displacement of the lock plate c extending.

[Problems to be solved by the device]

As shown in FIG. 4, the conventional lock device requires a large lock or stroke space because the lock plate draws a large arc to lock and unlock the lock. However, the current engine room is crowded with the engine and other devices and electric wiring, and it is becoming difficult to secure the large lock space as described above.

The present invention has been made in view of the above problems, and provides a box and lid locking device that can be locked and unlocked in a small lock space or stroke at a location where many devices are densely packed such as an engine room. The challenge is to provide.

[Means for Solving the Problems]

In order to achieve the above object, in the present invention, there is provided a device for locking a box body and a lid body, wherein a lock spring pivotably attached to a side wall of the lid body and an intermediate portion of the lock spring. The lock spring is formed of an elastic metal wire, and has one end rotatably connected to the other end and a stopper provided at the other end with an engaging portion for an engaging portion of the box side wall. A character-shaped knob portion, an elastic arm portion extending laterally from both sides of the knob portion through a step portion, and a free end portion of the elastic arm portion is substantially orthogonal to the knob portion with an appropriate spacer portion. And a pin shaft bent inward inward, the pin shaft being supported by a bearing hole provided in a side wall of the lid, and one end of the stopper being in an upright state. Adopted a structure that is connected so as to hang on the stepped part of the arm.

The above-described configuration will be specifically described with reference to the drawings showing an embodiment.

〔Example〕

FIG. 1 is an exploded perspective view of a main part of the device of the present invention, and FIGS. 2a and 2b are side views of the assembled and operated state (a is before locking, b is when locking).

In these figures, reference numeral 1 denotes a box body that constitutes the outer shell of the electrical junction box, and 2 denotes a lid body that covers the box body 1 as a waterproof cover.

The lock device is composed of a lock spring 3 pivotally attached to the lid body 2 so as to be tilted up and down, and a stopper 4 whose one end is rotatably connected to the lock spring 3.

The lock spring 3 is integrally formed by bending an elastic metal wire such as a piano wire, and has a knob portion 3a formed in a substantially U shape at the center and a narrow neck portion 3b below the knob portion 3a. Elastic arms 3d extending laterally from both sides of the step 3c,
It is composed of a pin shaft 3f bent inward from both arms 3d via a spacer 3e, and the pin shafts 3f and spacers 3e on both sides are formed.
Is bent in a direction substantially orthogonal to the knob portion 3a.

A storage recess 5 for the lock spring 3 is formed in the lid 3 straddling the side wall 2a and the top wall 2b, and the side wall 2a of the recess is formed.
Pin shaft 3f of the lock spring 3 in the pair of bearing holes 6, 6 provided on the side,
3f is supported.

The stopper 4 is formed as a plate-shaped rigid body, hooking pieces 4a are bent on both sides of the upper end, and hooks 4b that engage with the recesses 7 provided on the side wall 1a of the box 1 are provided on the lower end. The central portion is bent 4c outward along the outer walls of the box body 1 and the lid body 2.

The stopper 4 rotatably connects the hooking piece 4a at the upper end to the step 3c of the lock spring 3, and the hook at the lower end that hangs down when the lock spring 3 is shown in FIG. The portion 4b is set at a position where it engages with the recess 7.

In Fig. 2a, when the knob portion 3a of the lock spring 3 in the upright state A is tilted toward the storage recess 5 side as indicated by the arrow, the lock spring 3 shifts to the locked state B as shown in Fig. 2b. Box 1
The lid 2 is locked.

When the lock spring 3 shifts from the upright state to the locked state, the stopper 4 made of a rigid body has a hook portion 4b and a recess 7
Rotating around the engaging portion O with respect to, the tip end portion P, that is, the connecting portion P between the hooking piece 4a and the step portion 3c, moves along an arcuate locus Q.

On the other hand, the lock spring 3 rotates about the pin shaft 3f. At that time, if not restrained by the stopper 4, the stepped portion 3c, that is, the connecting portion P draws a locus Q '. However, in the restrained state by the stopper 4, it cannot move along the locus Q ′, but shifts along the locus Q.

The gap between the loci Q and Q'is absorbed by the elastic displacement of the elastic arm portion 3d and the spacer portion 3e from the pin shaft 3f of the lock spring 3 to the step portion 3c. Then, in the locked state B of the lock spring 3, as shown in FIG.
, The gap is eliminated, and each part of the lock spring 3 elastically returns.

In this way, the box body 1 and the lid body 2 are locked and unlocked by the snap mechanism of the lock spring 3, and the fasteners 4 are provided along the side wall of the box body 1 as shown in FIGS. It moves to the lock position and the unlock position with only a small amount of vertical movement.

To release the engagement between the hook portion 4b of the stopper 4 and the recess 7, the lock spring 3 may be slightly tilted in the direction opposite to the arrow in FIG. 2a.

In the above description, the recessed portion 7 is provided as the locking portion on the side wall 1a of the box body 1 and the hook portion 4b that engages with the recessed portion 7 is provided on the stopper 4; however, the locking projection is provided on the side wall 1a. However, the stopper 4 can be changed to a known means such as providing a locking hole. Further, as described with reference to FIG. 2A, the gap between the loci Q and Q'is caused by appropriately displacing the connecting portion P (step c of the elastic arm portion 3d) and the axis of the pin shaft 3f. This occurs, and the step portion 3c can be omitted by interposing the spacer portion 3e between the elastic arm portion 3d and the pin shaft 3f and displacing the shaft centers thereof. The neck 3b can be omitted as well.

[Effect of device]

As described above, according to the present invention, a large lock space is not required when locking and unlocking the box body and its lid, so that the lid such as the waterproof cover can be easily attached and detached even in a narrow space. be able to.

Further, at the time of locking, the stress applied to the abutting surfaces of the synthetic resin box body and the lid body and the packing or the like interposed therebetween is absorbed by the elastic arm portions of the lock spring, so that they are not damaged. .

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an essential part showing an embodiment of the device of the present invention. FIGS. 2a and 2b are side views of the same assembling and working state, where a is before locking and b is when locking. FIG. 3 is a perspective view of an essential part showing a conventional locking device, and FIG. 4 is a side view showing an operating state of the same. 1 ... Box, 2 ... Lid, 3 ... Lock spring, 3a ... Knob, 3d ... Elastic arm, 3e ... Spacer, 3f ... Pin shaft, 4 ... Stopper, 4b ...... Hook part (as engaging part), 6 ... bearing hole, 7 ... recessed part (as locking part).

Claims (1)

[Scope of utility model registration request] 1. A device for locking a box body and a lid body, comprising a lock spring which can be tilted up and down on a side wall of the lid body, one end rotatably connected to the middle of the lock spring, and the box body side wall on the other end. The lock spring is formed of an elastic metal wire, and has a substantially U-shaped knob portion at the center and step portions from both sides of the knob portion. And an elastic arm portion that extends in the lateral direction through a pin shaft that is formed by bending the free end portion of the elastic arm portion inward in a direction substantially orthogonal to the knob portion with an appropriate space. The pin shaft is supported by a bearing hole provided in the side wall of the lid, and one end of the stopper is connected so as to hang down to the step portion of the elastic arm portion of the lock spring in the upright state. Locking device for the box and lid characterized by.