JP2000045607A - Latch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit the setting and to improve the durability when an arm is manufactured by the integral molding of a synthetic resin. SOLUTION: An arm 11 is formed by a base to be mounted on a mirror plate of a drawer 1, an arm 11 connected to the base through a first hinge part 18, a connecting part 12 connected to a point of the arm 11, and a guide shaft 14 connected to the connecting part 12. The guide shaft 14 is slidably fitted in a guide hole formed on the base 10. A pull 5 is fixed on the guide shaft 14. The arm 11 comprises a spring piece 19. The resistance is low in the deflection deformation of the first hinge part 18 and the spring piece 19, so that the durability is high.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawer and a door latch device.

[0002]

2. Description of the Related Art In general, a latch device for a drawer or a door is provided with an engaging portion such as a nail or a hole on the inner surface of a furniture body, while a latch claw corresponding to the engaging portion of the main body is provided on the drawer or the door. It is provided so as to be freely rotatable horizontally, and a spring urges the latch claw to engage with the engagement portion so as to be selfish.Furthermore, when the pull provided on the door or the front surface of the door is pulled, the latch claw is disengaged from the engagement portion. It is configured to interlock via an interlocking member so as to be separated.

[0003] Japanese Patent Publication No. 59-11031 discloses a door latch device in which a latch member (driving body) formed of a synthetic resin into a parallelogram in a plan view is provided on the back surface of the door. And a latching claw that engages with an engaging portion of the main body on a side of the latch member that faces the main body. Further, there is described a configuration in which an operating rod of a puller is slidably fitted into a door, and a flange provided on the operating rod is brought into contact with a rear end surface of a latch member.

In this case, the hole in which the operating rod is fitted in the latch member is formed as a long hole extending in the left-right direction. Therefore, when the puller is pulled, the latch member collapses and deforms as a whole in a flat shape. The rear part of the latch member slides away from the main body, whereby the locking claw is disengaged from the engaging portion of the main body, and the latch is released.

[0005]

According to the configuration disclosed in Japanese Patent Publication No. 59-11031, the locking claw is returned to a state where it can be engaged with the engaging portion by utilizing the restoring force of the latch member itself. Therefore, there is an advantage that a spring is not required, and the number of members is reduced correspondingly, so that the assembling work can be reduced. However, in the configuration of this publication, when the latch member is deformed and the locking claw is disengaged from the engaging portion, the rear portion of the latch member rubs against the flange of the operating rod, so that when the latch member is deformed. Therefore, there is a concern that the resistance of the latch member is fast and durability is low.

The present invention provides a latch device of a further improved form while reducing the number of members by utilizing the elastic restoring force of a latch member made of a synthetic resin, following the concept of the above publication. It is intended for.

[0007]

According to the present invention, there is provided a latch device comprising:
The drawer includes a latch member made of synthetic resin disposed on the back side of the end plate or the back surface of the door, and an engaging portion provided on an inner portion of a main body to which the drawer or door is attached, and the latch member includes a drawer or It is formed in a form having a base to be attached to the door and an arm extending rearward along the inner surface of the main body.
This arm is connected to the base so as to approach / separate from the engaging portion by rotating against the elasticity,
A locking portion is formed on the arm to be engaged with the engaging portion by rotation of the arm when the drawer is pushed in or the door is closed.

Further, the pull provided on the drawer or the door and the arm are integrated with the rear end of the arm so that when the pull is pulled, the arm rotates in a direction in which the locking portion is disengaged from the engaging portion. It is linked and connected via the connected connection part.

[0009]

In this configuration, when the puller is pulled, the arm is rotated against the elasticity by the pulling action of the connecting portion so as to separate from the engaging portion of the main body, whereby the latch is released. Therefore, the latch is automatically released by the drawer withdrawing operation or the door opening operation. When the hand is released from the handle, the arm returns to the original position by the elastic restoring force, and the handle also returns to the original position.

However, in the present invention, since the locking portion is disengaged from the engaging portion only by the simple rotation of the arm,
Resistance to deformation of the latch member is small, and therefore, set of the latch member can be reduced and durability can be improved. In particular, according to the structure of the second aspect, since the return rotation of the arm can be more reliably performed by the spring piece, the durability can be further improved. Also, since the guide shaft fixed to the handle is also integrated with the latch member,
There is also an advantage that the number of members can be reduced and the labor of assembling and the like can be reduced.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings. << First Embodiment >> FIGS. 1 to 7 show a first embodiment. This embodiment is, for example, applied to a latch device of a drawer 1 in furniture such as a wagon, of which FIG. 1 is a cutaway perspective view of a wooden drawer 1 viewed from the back side, and FIG. FIG. 3B is a plan sectional view, FIG.
FIG. 2A is a sectional view taken along the line III-III, and FIG. 4 is a plan sectional view of a main part in a latch release state.

As shown in these figures, the drawer 1 is provided with a head plate 2, left and right side plates 3, a bottom plate 4, and a back plate (not shown). ing. On the other hand, the furniture body is provided with left and right side plates 6, and although not shown, the left and right side plates 6 are provided with rails for supporting the drawer 1 so as to be able to move back and forth. The latch device includes a latch member 7 provided above one of the side plates 3 on the back surface of the end plate 2,
And an engaging claw 8 provided as an example of an engaging portion on the inner surface of the side plate 6 of the main body. The engaging claw 8 is formed in a right-angled triangular shape in plan view, and its front surface is inclined. Instead of the engaging claw 8, a rectangular engaging hole may be formed.

The latch member 7 is integrally formed of a synthetic resin such as polypropylene.
A plate-shaped base 10 fixed by the above, an arm 11 extending rearward along the inner surface of the side plate 6 in the main body, a plate-shaped connection portion 12 connected to the rear end of the arm 11, and a guide shaft connected to the connection portion 12 Consists of fourteen. At the tip of the arm 11, a locking claw 15 that engages with and disengages from the engaging claw 8 is formed.

The base 10 is formed with a cylindrical portion 10a which is opened forward and backward. The cylindrical portion 10a is fitted into a hole formed in the end plate 2 from the rear, and a guide shaft 14 is slidably movable forward and backward in the cylindrical portion 10a. I'm fitting. In addition, a groove 16 that is opened rearward is formed in the base 10. The arm 11 is formed in a bifurcated shape by forming a through hole 17 opened toward the base 10, and the base of the arm 11 and the base 10 are bent via a thin first hinge portion 18. It is connected freely.
Therefore, the arm 11 pivots with the first hinge 18 as a branch,
Thereby, the locking claw 15 can be disengaged from the engagement claw 8.

A spring piece 19 extending toward the base 10 is integrally connected to a portion of the arm 11 near the tip. Spring piece 19
Is set to have a width that can be completely fitted in the through hole 17 of the arm 11, and the tip thereof is bent in the groove 16 of the base 10 in a state of being bent and deformed.
It is stuck in. Therefore, the arm 11 is biased so as to approach and approach the side plate 6 of the main body by the elastic restoring force of the first hinge portion 18 and the spring piece 19.

The connecting portion 12 is connected to the distal end (rear end) of the arm 11 through a thin second hinge portion 20. Further, a thin portion 21 for allowing bending is formed at a substantially middle portion of the connection portion 12 along the longitudinal direction. The guide shaft 14 has a flange 14a, and is connected to the flange 14a via the connecting portion 12 and the third hinge portion 22. Therefore, the guide shaft
When 14 slides back and forth within the cylindrical portion 10a of the base 10, the arm 11
Is rotated to engage and disengage the engaging claw 15 with the engaging claw 8.

The guide shaft 14 protrudes from the front surface of the end plate 2 by a small dimension in the retracted state.
Is fixed to the end of the puller 5 with a screw 23 inserted from behind. Therefore, the guide shaft 14 can be slid forward and backward by a fixed stroke L. As shown in FIG. 3, a plurality of (four) ridges 24 are formed on the outer periphery of the guide shaft 14. This is to reduce the friction between the guide shaft 14 and the cylindrical portion 10a.

As shown in FIG. 2, the arm 11 is covered with a cover 25 (the cover 25 is omitted in FIG. 1). The cover 25 is formed in a convex shape when viewed from the side, and is opened toward the side plate 6 of the main body to allow the arm 11 to rotate. In addition, the upper and lower edges of the cover 25 are bent inward, and the upper and lower bent pieces 25a are formed on the upper and lower edges of the base 10.
Fitted in 26. Therefore, the cover 25 is held so that it cannot be pulled backward.

As shown in FIG. 2A, a notch 27 is formed in the base 10 on the side opposite to the groove 16 with the cylindrical portion 10a interposed therebetween. Are fitted and engaged. Thus, the cover 25 is held so as not to be displaced in the left-right direction. Cover of the present embodiment
The 25 can be easily attached by a one-touch operation in which the claw 28 is fitted into the notch 27 while the vertically bent piece 25a is fitted into the step 26 of the latch member 7 and slid.

It should be noted that a pair of left and right latch members 7 may be provided on one drawer 1, or the latch members 7 may be provided on only one side of the drawer 1. In the case of the present embodiment, the tab 5 is configured to move back and forth as a whole, and when the latch member 7 is provided on only one side of the drawer 1, the side of the tab 5 where the latch member 7 is not attached is What is necessary is just to attach to the end plate 2 by a guide member etc. so that it can move back and forth.

In the above configuration, as shown in FIG. 2 (A), when the drawer 1 is pushed into the furniture body,
Since 15 is engaged with the engaging claw 8, the drawer 1 is held in a pressed state, and the drawer 1 does not naturally protrude due to vibration or the like. On the other hand, when the hand is put on the puller 5 in the closed state and pulled forward, the arm 11 rotates through the connecting portion 12 in conjunction with the guide shaft 14 sliding forward as shown in FIG. Thereby, the locking claw 15 is disengaged from the engaging claw 8 (that is, the latch is released), and the drawer 1 is pulled out.

When the drawer 1 is pulled out and the handle 5 is released, the arm 11 returns to the original position by the elastic restoring force of the first hinge portion 18 and the spring piece 19, and the guide shaft 14 is connected to the connecting portion 12
And the locking claw 15 returns to a state where it can be engaged with the engaging claw 8. Accordingly, when the drawer 1 is pushed into the main body by placing a hand on an appropriate portion on the front surface of the end plate 2, the locking claw 15 is engaged by so-called engagement engagement in which the arm 11 rotates once and then returns. It engages with the dowel 8.

If the V-groove-shaped thin portion 21 is formed in the connecting portion 12 as in the embodiment, when the drawer 1 is pushed in, the locking claw 15 is formed.
When the arm 11 is rotated so as to separate from the engaging claw 8 during the crimping engagement, the connecting portion 12 bends in a V-shape as shown by a dashed line in FIG. For this reason, there is an advantage that it is possible to prevent the guide shaft 14 from sliding forward when the drawer 1 is pushed in and the pull tab 5 from moving forward.

A plurality of thin portions 21 may be provided. Further, the connecting portion 12 may be formed so as to be easily bent and deformed as a whole. FIG. 5 is a perspective view in a state in which the arm 11 is expanded, FIG. 6 is a plan view in a state in which the latch member 7 is also expanded, and FIG. 6 is a front sectional view of FIG. It is manufactured in an expanded state. That is, as shown by a dashed line in FIG. 7, by using a pair of molds 30 and 31 which can be in close contact with and separated from each other, injection molding is performed by injecting a molten synthetic resin into a cavity formed in a mating surface of the two molds. It is manufactured in an expanded state. Then, the guide shaft 14 is
a.

As described above, the spring piece 19 is set to have a size that fits into the through hole 17 in order to enable molding using the pair of dies 30 and 31. Also, the notch groove 27 of the base 10
Is also formed by the difference between the two dies 30, 31. The same applies to the case of manufacturing by pressure molding or reaction molding.
The means for attaching the base 10 to the end plate 2 is not limited to the use of the screw 9. For example, a pin-shaped projection or the like may be formed on the base 10 and fitted into a hole formed in the end plate 2. good. The means for attaching the guide shaft 14 to the pull 5 is a screw.
The use of the pin 23 is not limited, and a pin provided integrally with the guide shaft 14 may be driven into a hole provided in the tab 5.

The arm 11 may be returned and deformed by the elastic restoring force of only one of the first hinge portion 18 and the spring piece 19. Further, the arm 11 and the base 10 may be configured to be largely bent and deformed over a wide range. << Another Example of Puller >> As shown in FIG. 8, the puller 5 may be configured to be rotatable. Note that the length and shape of the tab 5 may be appropriately set according to the design and the like.

{Second Embodiment} FIG. 9 shows a second embodiment. In this embodiment, an engaging claw 8 is provided on the side plate 6 of the main body as an example of an engaging portion, and a locking hole is formed on the arm 11.
Forming 32. The spring piece 19 is provided on the base 10. {Others} Although the above embodiment is applied to the drawer, the present invention can be applied to a door latch device. Further, the drawer and the door may be made of a metal plate. Also,
When applied to a drawer, the latch member does not necessarily need to be attached to the back surface of the end plate, but may be attached to the outer surface of the side plate of the drawer.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment.

2A is a plan sectional view of a main part, and FIG. 2B is a sectional view of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2 (A).

FIG. 4 is a plan view of the latch release state.

FIG. 5 is a perspective view in a state where an arm is expanded.

FIG. 6 is a plan view in a state where an arm is expanded.

FIG. 7 is a longitudinal sectional front view in a state where the arm is longitudinally sectioned.

FIG. 8 is a view showing another example of a handle.

FIG. 9 is a perspective view of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drawer 2 Drawer end plate 5 Puller 6 Side plate of furniture (wagon) body 7 Latch member 8 Engagement claw as an example of engagement part 10 Base 11 Arm 12 Connection part 13 Guide hole 14 Guide shaft 15 As an example of engagement part Locking claw 18 First hinge 19 Spring piece 25 Cover

Claims (2)

[Claims] 1. A drawer comprising: a latch member made of synthetic resin disposed on the back side of a head plate or a back surface of a door of a drawer; and an engaging portion provided on an inner side of a main body to which the drawer or the door is attached. The member is formed in a form having a base to be attached to the drawer or the door, and an arm extending backward along the inner surface of the main body, and this arm is turned to the engaging portion by rotating against the elasticity. The arm is connected to the base so as to move toward and away from the base, and a locking portion is formed on the arm to be engaged with the engaging portion by the pushing movement of the drawer or the rotation of the arm at the time of closing movement of the door. Alternatively, a handle provided on the door and the arm are connected via a connecting portion integrally connected to the rear end of the arm such that when the handle is pulled, the arm rotates in a direction in which the locking portion is disengaged from the engaging portion. Latch device that is connected in an interlocked manner. 2. The latch device according to claim 1, wherein
The arm is connected to a base via a flexible hinge portion, and a spring piece for urging the arm toward the engaging portion is integrally connected to one or both of the arm and the base, Further, a cylindrical portion opened on both front and rear surfaces is integrally formed on the base, and a guide shaft integrally connected to the connecting portion is fitted into the cylindrical portion so as to be slidable back and forth, and the guide shaft is fixed to the tab. Latch device comprising: