JP2680966B2 - Lock device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock device suitable for use in a wagon having a plurality of drawers and other furniture.

[0002]

2. Description of the Related Art Conventionally, in a wagon for storing documents and the like, furniture for storing clothes and the like, a drawer body supported by a support body of the wagon body or the furniture body is self-propelled. It has been common to separately provide a latch device for preventing such a situation and a lock device for locking the drawer body to the support body. However, it is difficult to reduce the number of manufacturing and assembling steps because of such a large number of parts.

Therefore, recently, a lock device having a built-in latch function has been developed. In this locking device, for example, a latch claw corresponding to each drawer is pivotally provided on the inner surface of the back plate of a wagon body including a plurality of drawers, and each latch claw is pulled to the most retracted position. The engaging element is elastically engaged so that the drawer can be temporarily held with a force weaker than the pull-out operation force. Then, a pressure receiving surface is formed on the back side of each of the latch claws, and a lock arm is rotatably pivoted at a portion facing the pressure receiving surface, and these lock arms are operated by an interlocking operation mechanism. A reciprocating rotary motion is performed from a standby position that does not hinder the elastic retracting operation to a lock position that abuts the pressure receiving surface of the latch claw in a substantially orthogonal posture and prohibits the rotation of the latch claw.

[0004]

By the way, the interlocking operation mechanism interlocks a plurality of rotating arms between a standby position and a lock position in response to a locking operation, thereby performing a simultaneous rotating operation. There is a certain limit to the simplification of the structure. That is, in this interlocking operation mechanism, the link plates are fixed to the shafts that rotate with the rotating arms, respectively, and
The rotating end of each link plate is connected to a common lifting plate via a pin, and this lifting plate is connected to the crank part of the key rod that rotates forward and backward in response to the locking operation, and each rotating arm is put in the standby position all at once. And the lock position are interlocked with each other, and the number of parts is relatively large. Therefore, although the number of parts can be reduced as compared with the case where the latch device and the lock device are separately provided,
Furthermore, at present, it is not possible to fully meet the demand for simplification of the structure.

The present invention aims to solve such problems.

[0006]

In order to achieve the above object, the present invention takes the following measures. That is, the locking device according to the present invention includes a support body such as a wagon body, a plurality of drawer bodies supported by the support body so as to be able to be drawn forward, and an engagement provided at a rear end portion of each drawer body. An element and a latch claw that is pivotally attached to a portion of the support corresponding to each of the drawers and temporarily elastically retracts in a certain direction when the drawer approaches the most retracted position to hold the engaging element. A locking device that is provided with a holding force of each latch claw, and is adapted to temporarily hold each corresponding drawer body with a force weaker than the pulling-out operation force. A pressure receiving surface provided on each of the latch claws, and a fixing surface facing the pressure receiving surface of each of the latch claws,
A slide plate attached to this fixed surface and capable of reciprocating in the latch claw arranging direction, a protrusion protruding from a portion of the slide plate corresponding to each latch claw, and a slide plate corresponding to a locking operation. Intervenes between the pressure receiving surface and the fixed surface of each latch claw and makes surface contact with the pressure receiving surface and the fixed surface, respectively.
And a slide mechanism that reciprocates between a pressure receiving surface and a fixed surface to a standby position where the pressure receiving surface and the fixed surface are disengaged.

In a preferred embodiment, each latch claw is axially mounted between the side plates of a frame having a U-shaped cross section, and the inner surface of the back plate of this frame is used as a fixed surface.

In order to facilitate the assembly work, a torsion coil type spring is wound around the support shaft of the latch claw, one end of the spring is held by the latch claw, and the other end is engaged with the frame. The latch claw is elastically biased in a certain direction by stopping the latch claw, and it is preferable that the latch claw is provided with a latching part for temporarily holding the other end of the spring.

[0009]

According to this structure, the projections of the slide plate are interposed between the pressure receiving surface and the fixed surface of each latch claw, and the slide plate is brought into surface contact with the pressure receiving surface and the fixed surface in accordance with the locking operation.
It can be slid from a possible locked position to a standby position where it is disengaged from between the pressure receiving surface and the fixed surface. First, when the slide plate is stopped at the standby position and then the drawer body is moved to the vicinity of the last retracted position, the latch claws pivotally supported on the support body side temporarily retract from the holding position. Then, when the drawer body reaches the most retracted position, the latch claw elastically returns to the holding position and engages with the engaging element of the drawer body to temporarily hold the drawer body. Since the holding force of the latch claw is weaker than the pull-out operation force, the temporary holding state is easily released when pulling out the drawer.

When the slide plate is slid to the lock position after pushing the drawer body to the rearmost retracted position, each projection of this slide plate intervenes between the pressure receiving surface of each latch pawl and the fixing surface on the support body side. As a result, the retracting operation of the latch claw is prohibited. Therefore, even if a pull-out operation force is applied to the drawer body in this state, the latch claw cannot be retracted, so that the drawer body is locked by the latch claw at the last retracted position. In this case, the protrusions are on the pressure receiving surface and the fixed surface.
Since they are in contact with each other, the reaction force from the latch claw can be easily received.
It is possible to stop it and keep the strength excellent
It becomes possible to do.

[0011]

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

The wagon 1 shown in FIG. 1 comprises a wagon body 2 which is a support and a plurality of drawers 3 which are drawer bodies mounted on the wagon body 2. The locking device according to the present invention is provided between the wagon body 2 and the drawer 3. 4 is provided.

The wagon body 2 includes a bottom plate 21 and left and right side plates 2.
2, a back plate 23 and a top plate 24, which are box-shaped, and each drawer 3 is supported between the side plates 22 via a rail mechanism (not shown) so as to be drawn forward. The wagon 1 can be freely moved on the floor surface by the casters 25 attached to the lower surface of the bottom plate 21.

The drawer 3 includes a bottom plate 31, left and right side plates 32,
It has a normal basic structure composed of a back plate 33 and an end plate 34, and a rod 36 is fixedly mounted on a rear end 3a thereof via a bracket 35. The bracket 35 is fixed to the left and right sides of the back plate 33 with a plurality of screws 37, and is projected rearward from the back plate 33. Rod 36
Is the one with screws on both ends.
It is installed between 5 and the both ends are fixed to the respective brackets 35 by nuts 38. A cam receiving roller 39, which is an engaging element, is attached to one end of the rod 36.

The lock device 4 includes a latch claw 41 pivotally attached to a portion of the wagon body 2 corresponding to each cam receiving roller 39,
Pressure receiving surface 42 provided on each latch claw 41 in the retreat direction
A fixed surface 43 facing the pressure receiving surface 42 of each latch claw 41, a slide plate 44 attached to the fixed surface 43 and capable of reciprocating in the latch claw arrangement direction, and each latch claw of the slide plate 44. 41 and the slide plate 44 corresponding to the locking operation, the projections 45 intervene between the pressure receiving surface 42 and the fixed surface 43 of each latch claw 41 and the pressure receiving surface 42. And the fixed surface 43
The pressure receiving surface 42 and the fixed surface 4 from the lock position a where they can come into contact with each other.
3 and a slide mechanism 46 that reciprocates between a position 3 and a standby position b that is detached.

The latch claw 41 has a support shaft 41 at the base end portion 41b.
It is pivotally attached to both side plates 47a of the frame 47 via a, and the tip end portion 41c is vertically rotatable within a certain range. A cam surface 41d is formed on the lower surface of the latch claw 41, and the torsion coil spring 48 is formed by winding the latch claw 41 around the support shaft 41a.
The cam surface 41d is slidably contacted with the cam receiving roller 39 by biasing the cam surface 41d in the engaging direction (the arrow X direction). The cam surface 41d has a recessed portion 41e near the center thereof, and when the drawer 3 reaches the final retracted position, the cam receiving roller 39 has the recessed portion 41e.
It is designed to be depressed and locked. That is,
The elastic biasing force for rotating the tip portion 41c of the latch claw 41 downward is set to a value that can prevent the drawer 3 from self-propelling due to its weight or the like. The pressure receiving surface 41a of each latch claw 41 is formed so as to face the fixed surface 43 in a substantially parallel manner, and is a flat surface that is substantially orthogonal to the retracting direction (arrow Y direction) of each latch claw 41.

The frame 47 is a back plate 2 of the wagon body 2.
3 is a U-shape in a plan view which is erected along the inner surface of the frame 3, and the inner surface of the back plate 47b of the frame 47 is the fixed surface 43. Then, the base end portion 4 of each of the latch claws 41 is
A locking leg 41f that abuts on the fixed surface 43 is integrally projectingly provided on the 1b, and the locking leg 41f is attached to the slide plate 44.
When the latch claw 41 is engaged in the engagement direction X by penetrating the rectangular hole 44b formed in the
It regulates the unlimited rotation to. The locking leg 41f of the latch claw 41 has a height dimension slightly larger than the plate thickness of the slide plate 44, and when the slide plate 44 slides up and down,
The base end portion 41b is prevented from rubbing against the slide plate 44. The spring 48 is wound around the support shaft 41a of the latch claw 41, and one end 48a of the spring 48 is inserted into and held by a mounting hole 41g formed in the side surface of the latch claw 41. The end portion 48b is locked to the frame 47. On the side surface of the latch claw 41,
A key-shaped hooking portion 41h is integrally provided so as to project, and the other end 48b of the spring 48 can be hooked on the hooking portion 41h.

The slide plate 44 is a strip plate, has a width dimension slightly smaller than the distance between the side plates 47a of the frame 47, and is vertically slidably attached to the fixed surface 43 of the frame 47. . Bulging portions 44a that are displaced forward are formed at portions of the slide plate 44 that correspond to the latch claws 41, and the protrusions 45 are attached to the bulging portions 44a. The protrusion 45 is made of, for example, a synthetic resin, and has a flat surface portion 45a that locks the pressure receiving surface 42 of the latch claw 41 and an inclined guide surface 45b that is continuous with the lower end of the flat surface portion 45a. The width dimension is almost equal to the distance between the side plates 47a, and the rear surface of the bulging portion 44a and the fixed surface 43 are
Has a flat portion 45c sandwiched between the slide plate 4 and
4 is configured not to directly contact the fixed surface 43.

The slide mechanism 46 includes the slide plate 44.
A projecting piece 46a extending laterally is provided at the upper end of the projecting piece 4a.
The crank portion 49a of the key rod 49 is inserted into the hole 46b formed in 6a. The key rod 49 is the top plate 2
4 is provided along the lower surface of the front and rear, and has a crank portion 49a at its rear end, and the crank portion 49a is rotatably fitted in the hole 46b of the projecting piece 46a.
The front end of the key rod 49 is connected to the lock 5. Lock 5
The key hole 51 is provided so as to be exposed on the front surface of the top plate 24, and the key rod 49 can be rotated normally and reversely by inserting the key 6 into the key hole 51 and performing a locking operation. It is composed.

According to the lock device 4 having such a structure,
When the lock 5 is set in the unlocked state, the crank portion 49a of the key rod 49 moves upward, and the slide plate 44 is pulled up to the standby position b. As a result, the protrusions 45 attached to the slide plate 44 are disengaged from the positions where the pressure receiving surfaces 42 of the latch claws 41 and the fixing surface 43 of the frame 47 face each other (FIG. 6), and the latch claws. 41 is
By receiving an external force, it becomes a state where the retracting operation can be performed upward. Then, in this state, when the drawer 3 is moved to the vicinity of the last retracted position, first, the cam surface 41 of the latch claw 41 is
The cam receiving roller 39 of the drawer 3 comes into contact with d (FIG. 5).
Then, when the drawer 3 is further retracted from that state,
Due to the guiding action of the cam surface 41d, the latch claw 41 is temporarily retracted upward against the elastic force of the spring 48,
When the drawer 3 moves to the last retracted position, the cam surface 41
The cam receiving roller 39 is engaged with the concave portion 41e of d. In this state, the drawer 3 is held by the latch claw 41 and is prevented from moving.

From this state, when the key 6 is inserted into the keyhole 51 and the normal operation is performed, the key rod 49 rotates and the slide plate 44 descends to the lock position a. As a result, FIG.
And as shown in FIG. 4, each projection 4 of this slide plate 44
5 intervenes between the pressure receiving surface 42 of each latch claw 41 and the fixing surface 43 of the frame 47, so that each latch claw 41 cannot retract. Therefore, each drawer 3 is in a locked state. When the operation for releasing the lock is performed, the protrusions 45 are lifted by the operation reverse to the above operation, and the original unlocked state is obtained.

As described above, according to the present device, both the latch function and the lock function can be exhibited. However, this device has no mechanism or mechanism between the slide plate 44 and each projection 45 for engaging and disengaging the lock. Since it is not necessary to intervene any parts, the movement of the slide plate 44 is converted into the rotation operation of the rotation arm via the pin or the link arm to restrain the operation of the latch claw 41, compared to the conventional apparatus. By significantly reducing the number of parts, the man-hours required for manufacturing and assembling can be reasonably and surely reduced.

The construction for actuating the slide plate 44 is not limited to the embodiment shown in the drawings, and for example, one using a lever is one using a rack and pinion, etc., which deviates from the spirit of the present invention. Various modifications are possible within the range not to do.

The present invention is not limited to the wagon 1 and can be suitably applied to other furniture having a plurality of drawers.

Further, the mounting structure of the spring 48 for urging the latch claw 41 is not limited to that described above, but the structure of the above-described embodiment simplifies the assembling work. be able to. That is, normally, a torsion coil spring 48 having one end 48a held by a latch claw 41 is wound around a support shaft 41a of the latch claw 41, and the support shaft 41a is mounted between the side walls 47a of the frame 47. For the work to be performed, the support shaft 4 is pressed while pressing the latch claw 41 which is about to rotate in a certain direction by the urging force of the spring 48.
It is necessary to insert 1a into the shaft holding hole of the side wall 47a.
However, in the above-described embodiment, the other end 48b of the spring 48 is temporarily held by the latching portion 41h of the latch claw 41, so that the support shaft 41a does not act on the latch claw 41 at all. Can be installed. Then, in this state, the support shaft 41a of the latch claw 41 is mounted between the side walls 47a of the frame 47, and then the other end 48b of the spring 48 is removed from the latching part 41h of the latch claw 41 and abuts on the frame 47. If so, the latch claw 41 is elastically biased by the spring 48 from that point. Therefore, the latch claw 41 can be assembled to the frame 47 without being affected by the elastic biasing force of the spring 48.

[0026]

As described above in detail, according to the present invention, a latch function for temporarily holding the drawer body with a force weaker than the pulling-out operation force and a plurality of stages of drawer bodies can be locked simultaneously by the locking operation. It is possible to provide a lock device having both a lock function and excellent functionality, and it is possible to improve the workability of assembly as compared with the case where a latch device and a lock device are separately provided.

Moreover, the pressure receiving surface of the latch claw is opposed to the fixed surface, and the protrusion disposed between the pressure receiving surface and the fixed surface is reciprocally moved by the common slide plate to lock the latch claw. Therefore, the number of parts can be reduced compared to the conventional one in which the latch claws are restrained by the rotating arm, and the man-hours required for manufacturing and assembling the parts can be reasonably reduced. effective.
Also, since the protrusion is in surface contact with the pressure receiving surface and the fixed surface,
You can comfortably receive the reaction force from the latch claw,
It is possible to maintain the excellent strength.

[Brief description of the drawings]

FIG. 1 is a partially omitted perspective view showing an entire embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of the embodiment.

FIG. 3 is a plan view showing a main part of the embodiment.

FIG. 4 is an IV-IV arrow view in FIG. 3 of the same embodiment.

FIG. 5 is an operation explanatory view showing a state immediately before the latch claw of the embodiment is latched.

FIG. 6 is an operation explanatory view showing a state in which the drawer of the embodiment is pulled out forward.

FIG. 7 is a front view showing a main part of the embodiment.

FIG. 8 is a perspective view of a main part showing a state of a spring at the time of assembling in the embodiment.

[Explanation of symbols]

 2 ... Support body (wagon body) 3 ... Drawer body (drawer) 4 ... Lock device 5 ... Lock 39 ... Engaging element (cam receiving roller) 41 ... Latch claw 41a ... Support shaft 41h ... Hooking portion 42 ... Pressure receiving Surface 43 ... Fixed surface 44 ... Slide plate 45 ... Protrusion 46 ... Slide mechanism 47 ... Frame 48 ... Spring 48a ... One end 48b ... Other end a ... Lock position b ... Standby position

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takeshi Yoshida 1800-12 Shiromachi, Yamatokoriyama City, Nara Prefecture (72) Inventor Yasuhiko Ikeda 184 Maiokacho, Totsuka-ku Yokohama City, Kanagawa Prefecture Nifco Co., Ltd. (56) Reference Document JP-A-2-243888 (JP, A)

Claims (3)

(57) [Claims] 1. A support body such as a wagon body, a plurality of drawer bodies supported by the support body so as to be able to be pulled out forward, an engagement element provided at a rear end portion of each drawer body, and the support. A latch claw that is pivotally attached to a portion of the body corresponding to each of the drawer bodies and that temporarily retracts elastically in a certain direction when the drawer body approaches the most retracted position and holds the engagement element. A locking device applied to a structure in which the corresponding pulling body can be temporarily held with a force weaker than the pulling-out operation force by the holding force of each latch claw. On the pressure receiving surface of each of the latch claws, a fixing surface facing the pressure receiving surface of each of the latch claws, a slide plate attached to the fixed surface and capable of reciprocating in the latch claw arrangement direction, and Corresponding to the protrusion protruding on the corresponding part and the locking operation Were each projection sliding plate and is interposed to their pressure receiving surface及 between the pressure receiving surface and the fixed surface of each latch pawl
And a slide mechanism that reciprocates between a lock position capable of making surface contact with the fixed surface and a standby position separated from the pressure receiving surface and the fixed surface, respectively . 2. A lock device according to claim 1, wherein each latch claw is axially mounted between side plates of a frame having a U-shaped cross section, and an inner surface of a rear plate of the frame is a fixed surface. 3. A torsion coil type spring is wound around a support shaft of the latch claw, and one end of the spring is held by the latch claw and the other end is locked by the frame to secure the latch claw. The lock according to claim 2, wherein the latch pawl is provided with a latching portion for elastically biasing in a fixed direction and for temporarily holding the other end of the spring. apparatus.