JP2004131952A - Latch device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a latch device used with high reliability without accidentally unlocking latch locking by the floating and rotation of a control lever by the collision or the like of the other utensil. <P>SOLUTION: A hook lever 12 is connected to a second bearing plate 11 at the other end of a base plate 1 by a third pivot shaft 13, and a receiving hole 15 to which a front-end hook 14 for the hook lever 12 is entered or projected, is formed at the front end of the control lever 3. A spring-receiving projection 17 is formed at a side face facing a second pivot shaft 6 as the root of the front-end hook 14 for the hook lever 12, and the hook lever 12 is rotated and urged by a second spring member 16 so that the front-end hook 14 is engaged with the surface-side hole edge 15a of the engaging receiving hole 15 under a latch locking state. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latch device used for an equipment storage box or the like.
[0002]
2. Description of the Related Art In a conventional latch device, a base portion of an operation lever is connected to a bearing plate projecting from one end of a base plate by a first pivot, and a proximal end of a latch arm is operated by a second pivot. The second pivot is located closer to the base plate than the reference straight line passing through the catch and the first pivot in the locked state in which the hook is connected to the intermediate portion of the lever and the tip hook of the latch arm is engaged with the catch. The first pivot and the second pivot are arranged as described above (for example, see Patent Document 1).
[0003]
In this conventional device, since there is no means for locking the operation lever to the base plate, other objects collide with the tip of the operation lever and the operation lever is lifted up around the first pivot and rotated. At times, there is a risk that the engagement between the latch arm and the catch is unintentionally released and the locking of the wing body with respect to the fixed frame is accidentally released.
[0004]
A lock plate is movably fitted along the base plate in a slot of the guide plate portion of the base plate, a receiving plate is fixed to the operation lever, and the projecting plate portion of the lock plate is fixed to the locking plate portion of the receiving plate. There is one in which the operating lever is locked to the base plate by engaging with the lock notch (see Patent Document 2), but the manufacturing cost is increased due to the complicated structure. .
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 61-176375 [Patent Document 2]
Japanese Patent No. 2590048
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an operation lever having a simple structure and a hook lever to be engaged and disengaged, so that even if another object collides with the distal end of the operation lever, the object is locked. An object of the present invention is to provide a latch device in which the locking is not accidentally released and the undulating rotation of the hook lever is accurately performed by a stable spring force.
[0007]
The latch device according to the present invention will be described below with reference to the accompanying drawings. In the latch device of the present invention, a first bearing plate portion 2 at one end of a base plate 1 is provided with a base of an operation lever 3. The end is connected by a first pivot 4 and the proximal end of the latch arm 7 is connected to the control lever 3 by a second pivot 6 fitted in a longitudinal slot 5 formed in the middle of the control lever 3; In the locked state where the leading end hook 8 of the latch arm 7 is engaged with the catch 9, the second pivot 6 comes closer to the base plate 1 than the reference straight line L passing through the tip hook 8 and the first pivot 4. The first pivot 4 and the second pivot 6 are arranged as described above, and the second pivot 6 is moved and urged by the first spring member 10 in a direction away from the first pivot 4, and a second bearing at the other end of the base plate 1 is provided. The hook lever 12 is connected to the plate portion 11 by a third pivot 13, A locking receiving hole 15 through which the tip hook 14 enters and exits is formed at the tip of the operating lever 3, and a spring receiving projection is formed on the side of the hook lever 12 at the root of the tip hook 14 and facing the second pivot 6. 17, the hook lever 12 is rotationally urged by the second spring member 16 so that the tip hook portion 14 engages the front side edge portion 15a of the locking receiving hole 15 in the locked state. The spring member 16 is formed of a torsion coil spring, the coil portion 16a is fitted to the third pivot 13, and one straight end 16b is brought into contact with the upper surface of the end of the base plate 1, and the other straight line of the second spring member 16 is formed. The bent end portion 16d of the end portion 16c is engaged with the spring receiving projection 17 from the lower surface side.
[0008]
In use, the base plate 1 is fixed to a fixed frame 18 such as an equipment box, and the receiver 9 is fixed to a wing 19 such as a door. When the wing body 19 is closed and locked on the fixed frame body 18, the operating lever 3 is folded down toward the base plate 1, and the second pivot 6 is connected to the receiver 9 and the second pivot 9 as shown in FIG. It is closer to the base plate 1 than a reference straight line L passing through one pivot 4. At this time, the operation lever 3 is urged to rotate clockwise in FIG. 4 around the first pivot 4 by the first spring member 10, and the operation lever 3 is held in the down state.
[0009]
Furthermore, the tip hook portion 14 of the hook lever 12 projects from the locking receiving hole 15 of the operation lever 3 toward the front side, and the tip hook portion 14 is engaged with the front side hole edge 15a of the locking receiving hole 15. I have. Since the engagement between the distal end hook portion 14 and the operation lever 3 is held by the rotational bias of the second spring member 16, the operation lever 3 is maintained in the lying state.
[0010]
To release the locking and open the wing body 19, a finger is hooked on the tip hook 14 of the hook lever 12, and the tip hook 14 is detached from the front side edge 15 a of the locking receiving hole 15. As described above, the second spring member 16 is retracted and rotated about the third pivot 13 against the urging of the second spring member 16.
[0011]
After or concurrently with the retreat rotation, the operation lever 3 is pulled up and rotated about the first pivot 4 against the rotational bias of the eleventh spring member 10. At the moment when the second pivot 6 exceeds the reference straight line L, the direction of the rotational bias by the first spring member 10 is reversed.
[0012]
When the operation lever 3 is lifted with respect to the base plate 1 by a certain angle or more, the latch arm 7 is tilted and rotated so as to be separated from the catch 8, and the leading end hook portion 8 of the latch 7 is completely detached from the catch 9. . As a result, the locking of the wing body 19 with respect to the fixed frame body 18 is released, and the wing body 19 is opened by pulling the operation lever 3 or another prepared handle.
[0013]
After the required work is completed, the wing member 19 is opened, and then the operation lever 3 is pushed down and rotated about the first pivot 4 so that the front end hook 8 of the latch arm 7 slides on the front plate of the fixed frame 18. When the second pivot 6 comes closer to the base plate 1 than a straight line passing through the receiver 9 and the first pivot 4, the front end hook 8 engages with the receiver 9 while being in contact with and engaging with the receiver 9. The engagement is deep, and the wing body 19 is locked and locked to the fixed frame body 18.
[0014]
At the final stage of the downward rotation of the operating lever 3, the tip hook portion 14 of the hook lever 12 enters the locking receiving hole 15 of the operating lever 3, and the back side edge 15 b of the locking receiving hole 15 connects the distal hook portion 14. By pushing, the hook lever 12 retreats and rotates around the third pivot 13 against the second spring member 16 so that the tip hook portion 14 passes through the locking receiving hole 15.
[0015]
When the operating lever 3 is pushed down to the position where the locking is established, the tip hook portion 14 of the hook lever 12 protrudes toward the front surface of the operating lever 3, and the tip hook portion 14 is the front edge of the locking receiving hole 15. By engaging with the portion 15a, the operation lever 3 is held in the down state.
[0016]
When the hook lever 12 moves up and down to engage and disengage from the operation lever 13, the second spring member 16 composed of a torsion coil spring has a coil portion 16a fitted on the third pivot shaft 13 and one straight end 16b formed on the base. Since the tip bent portion 16d of the other straight end portion 16c is engaged with the spring receiving projection 17 from the lower surface side while being in contact with the upper surface of the end portion of the plate 1, the tip bent portion 16d is The point of contact of the second spring member 16 with respect to the hook member 12 is stabilized without changing the contact point with the hook lever 12 in a misalignment along the length direction of the hook lever 12.
[0017]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, a first bearing plate portion 2 is formed by bending one pair of upper and lower portions at one end of a base plate 1, and a second bearing plate portion 11 is formed at the other end of the base plate 1. The upper and lower parts are formed by bending. A shaft hole 20 through which the first pivot 4 passes and the slot 5 are formed in the side wall plate portion 19 integrated vertically with the operation lever 3. The locking receiving hole 15 is formed in the main plate portion 21 of the operation lever 3. The latch 7 is formed in a U-shape when viewed from the front.
[0018]
The first spring member 10 is constituted by two compression coil springs, and each compression coil spring is fitted in the strip-shaped guide portion 23 of the first spring receiving member 22. The end face receiving groove 24 of the first spring receiving member 22 is engaged with the first pivot 4. The second spring receiving member 25 is fitted to the distal end of the guide portion 23 through the through hole 26, and the second spring receiving member 25 is pressed against the second pivot 6 by the elasticity of the spring spring member 10. The posture holding plate 27 of the second spring receiving member 25 is in contact with the back surface of the main plate 21 of the operation lever 3.
[0019]
The second spring member 16 is constituted by a torsion spring, and the third pivot 13 is fitted in a coil portion thereof. One end of the second spring member 16 contacts the intermediate side surface of the hook lever 12, and the other end of the second spring member 16 contacts the base plate 1. The flat surface 12a at the base end of the hook lever 12 abuts on the front surface of the base plate 1, thereby holding the hook lever 12 in an upright state.
[0020]
A cam surface 14a is formed in the distal end hook portion 14 of the hook lever 12 so as to be in contact with a back surface side edge 15b of the locking receiving hole 15 of the operation lever 3 in an arc shape.
[0021]
As described above, in the latch device of the present invention, the hook lever 12 is connected to the second bearing plate portion 11 at the other end of the base plate 1 by the third pivot 13, and the hook portion at the tip end of the hook lever 12 is provided. A locking receiving hole 15 into and out of which the locking lever 14 is formed is formed at the distal end portion of the operation lever 3. Since the hook lever 12 is rotationally urged by the spring member 16, the operating lever 3 is not lifted and rotated by the collision of other objects and accidentally unlocked, and the locking is prevented from being accidentally used. be able to.
The locking mechanism of the operation lever 3 to the base plate 1 by the hook lever 12 includes the hook lever 12, the third pivot 13, and the second spring member 16, and the structure is simplified as compared with the conventional device. Therefore, the production cost can be reduced.
[0022]
Further, in the present invention, a spring receiving projection 17 is formed on a side surface portion facing the second pivot 6 at a root portion of the tip hook portion 14 of the hook lever 12, and the second spring member 16 is constituted by a torsion coil spring. The coil portion 16a is fitted on the third pivot 13, one linear end 16b is brought into contact with the upper surface of the end of the base plate 1, and the tip bent portion 16d of the other linear end 16c is placed on the lower surface of the spring receiving projection 17. Since the engagement is performed from the side, the point of attachment of the second spring member 16 to the hook member 12 is determined, and the undulating rotation operation of the hook member 12 is always accurately performed by the stable spring force.
Furthermore, the approach of the operator's fingertip to the contact portion between the bent end portion 16d of the second spring member 16 and the hook lever 12 is prevented by the spring receiving projection 17 formed above the contact portion. In a state where the operation lever 3 is flipped up, there is no danger of pinching the fingertip between the bent end portion 16d of the second spring member 16 and the hook lever 12.
[Brief description of the drawings]
FIG. 1 is a front view in a locked state of a latch device according to an embodiment of the present invention.
FIG. 2 is a rear view of the latch device.
FIG. 3 is a bottom view of the latch device.
FIG. 4 is a sectional view taken along line AA of FIG. 1;
FIG. 5 is a right side view of the latch device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 base plate 2 first bearing plate 3 operating lever 4 first pivot 5 slot 6 second pivot 7 latch arm 8 tip catch 9 catch 10 first spring member 11 second bearing plate 12 hook lever 13 third pivot 14 Tip hook part 15 Lock receiving hole 16 Second spring member

Claims (1)

The base end of the operating lever 3 is connected to the first bearing plate 2 at one end of the base plate 1 by a first pivot 4 and is fitted into a longitudinal slot 5 formed in the middle of the operating lever 3. When the base end of the latch arm 7 is connected to the operation lever 3 by the second pivot 6, the second pivot 6 is connected to the distal end latch in a locked state in which the distal end latch 8 of the latch arm 7 is engaged with the receiver 9. The first pivot 4 and the second pivot 6 are arranged so as to be closer to the base plate 1 than the reference straight line L passing through the first pivot 4 and the first pivot 4, and the first pivot 4 is moved away from the first pivot 4 in the first direction. The movable lever is biased by the spring member 10 to connect the hook lever 12 to the second bearing plate 11 at the other end of the base plate 1 via the third pivot shaft 13, and the hook receiving end 14 of the hook lever 12 enters and exits. A hole 15 is formed at the tip of the operation lever 3 and the tip of the hook lever 12 is formed. A spring receiving projection 17 is formed on a side surface of the hook portion 14 facing the second pivot 6, and the front hook portion 14 becomes a front-side hole edge 15a of the locking receiving hole 15 in the locked state. The second spring member 16 rotationally urges the hook lever 12 so as to engage with the second spring member 16, the second spring member 16 is formed of a torsion coil spring, the coil portion 16a is fitted to the third pivot 13, and one straight end is formed. A latch device in which the upper end portion of the base plate is brought into contact with the upper end portion of the base plate, and the bent end portion of the other linear end portion of the second spring member is engaged with the spring receiving projection from the lower surface side.

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