JPH07301046A - Door latch - Google Patents

Abstract

PURPOSE:To make a door latch in a door closing state by unwilling external force in a door opening state and prevent a latch head from being damaged caused by clashing with a striker in the case a door is closed under such a state. CONSTITUTION:A latch head 2 is pivoted inside the front end of a latch main body 1 fixed to the rear end of the opened end of a door 6 in a turnable manner, a latch spring 4 is mounted between the latch main body 1 and a latch moving body 3 fitted to the latch head 2 so that it is capable of sliding back and forth, the latch head 2 is turned and energized to the inside, and the latch moving body 3 is pushed forward and is energized. By closing the door 6, a striker 10 projected from the inside of a side plate 8b of a cabinet 8, etc., is projected to an inclined surface 3d of the front end of the latch moving body 3 to retreat it, the striker 10 is interlocked with an interlocking recessed groove 2c of the latch head 2, and the latch head 2 is turned against spring force of latch spring 4. The latch moving body 3 gets over the striker 10, an interlocking surface 3e thereof is interlocked with the striker 10, and the door is kept in a closed state by fixing the latch head 2.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a door latch.

[0002]

2. Description of the Related Art Conventionally, a latch of this type is shown in FIG.
As shown in (A), (B), and (C), the latch body a is rotatably supported in the front end of the latch body a by a spindle b in the directions of arrows c and c '. Latch head d,
The latch head d is composed of a shaft e fixed to the latch head d and a shaft f fixed to the latch main body a, and a latch spring g is provided so as to hook each end thereof.
From the position shown in (B) of the above figure to the open state in which it rotates in the direction of arrow c in the above figure (A) and the state of holding the closed door that rotates in the direction of arrow c'in the above figure c. Thus, there is known a device configured to urge a rotation.

That is, when the door having the above structure is closed, the latch head d of the latch attached to the door is closed as shown in FIG.
From the inner surface of the side plate of a cabinet or the like (not shown), it strikes a projecting striker h and is rotated in the direction of arrow c'against the spring force of the latch spring g so that the latch head b is rotated by the angle shown in FIG. Be moved. At this position, in the state shown in FIG. 7A, the spring force P ₁ acting in the direction shown in the figure acts on the spring force P ₂ toward the center of the spindle b of the latch head d. Therefore, the rotational force of the latch head d, that is, the rotational bias by the latch spring g becomes zero.

When an external force in the door closing direction is further applied from the position shown in FIG. 3B, the latch head d is pushed by the striker h to rotate in the direction of arrow c ', and the door closing shown in FIG. In the holding state, in this state, the spring P ₃ by the latch spring g is deflected to the front side with respect to the center of the support shaft b, so that the latch head d receives a spring force in the direction of arrow c ′. The door (not shown) is kept closed by this.

[0005]

However, when the above-mentioned latch is used, the latch head d is held by the latch spring g at the door open position shown in FIG. 5A and the door closed position shown in FIG. 5C. The latch head d at the position shown in FIG.
If it is mischievously or unintentionally turned and is moved to the door closing position shown in the same figure (C), the latch head d is held at that position by its spring force. Becomes Therefore, if the door closing operation is performed in this state, the striker h hits the portion i of the latch head d shown in FIG. If it strikes the striker violently, the latch head and striker will be damaged.

The present invention has been made in view of the problems of the above-described conventional latch, and does not use a mechanism for biasing the latch head by inverting and biasing the latch head by a latch spring in a symmetrical direction with respect to the dead center. , The latch head is urged to rotate by the latch spring only in one direction opposite to the direction in which it is pressed and rotated by the striker, and is slidable in the front-back direction in the latch head and the latch body. The latch moving body incorporated as described above is pushed forward by the latch spring so as to be biased, so that the latch head is engaged with the engaging groove at the position where the latch head is rotated against the spring force by the striker. The striker is locked to the locking surface inclined at the front end of the latch moving body so that the closed state can be maintained and the open state. The latch head is configured so that it cannot be held in the closed state due to the urging force generated in one direction, which prevents accidental damage to the latch head and striker as in the conventional example. The purpose is to be able to do so.

[0007]

In order to achieve the above object, the present invention is attached to an open end of a back surface of a door which is pivotally attached to an opening of a cabinet or the like so as to be openable and closable. The latch main body and the front end side inside the latch main body, and the upper and lower side plate portions are pivoted to be close to the back surface of the door,
Inside the latch body and the latch head, which are rotatably supported in the separating direction, and inside the latch body and the latch head, there are upper and lower side plate portions, and the front end portion and the rear end portion side thereof respectively in the front-back direction. Each of the elongated holes is provided with the above-mentioned pivot axis,
Insert the second fixing pin installed on the rear of the latch body,
A latch moving body arranged so as to be slidable in the front-rear direction,
A third fixing pin erected on the rear end of the latch moving body,
Between the latch head and the first fixing pin installed on the rear end portion inside the shaft support portion, a turning force to the rear end side is applied to the latch head, and a front end side is applied to the latch moving body. And a latch spring for urging 0 force to push each of them are stretched, and the latch head is provided at the front end portion thereof with a long slant in the front-rear direction and is recessed so as to project from the inner surface of the side plate of the cabinet or the like. The striker engages with the engagement groove that engages in a disengageable manner and the rear end side of the inner plate portion of the striker so that the striker can abut the front end of the inner plate portion of the latch body, and abut the front end. At the position where the striker can be engaged with the engaging groove, a latching portion that holds the latch head is formed.On the other hand, the latch moving body is provided inside the front end portion thereof when the door is closed. Yes, it can come in contact with the striker , And an inclined surface inclined from the inner rear end portion toward the front end outer side so that the latch moving body can retreat against the spring force of the latch spring by contact with the striker, and the front end of this inclined surface. And a locking surface of the striker inclined from the protruding end toward the outer side toward the outer rear end side is formed, and the striker is sandwiched and held by the engaging groove of the latch head and the locking surface of the latch moving body. The present invention is intended to provide a door latch characterized by being configured as follows.

[0008]

[Function] When an external force in the closing direction is applied to the door in the open position to close the door, the striker protruding on the inner surface of the side plate of the cabinet or the like and the front end portion of the latch moving body, The slanted surface inclined from the inner rear end side to the front end side hits, and the slanted surface slides against the striker by the closing force of the door, and the latch moving body is pushed forward by the latch spring. It slides back against the biasing force. As a result, the lower edge of the opening of the engaging groove of the latch head contacts the front surface of the striker.

Further, as the door is closed, the striker moves the latch moving body backward, and the latch head is pushed and rotated outward against the spring force of the latch spring. During this time, the striker enters and engages in the engaging groove. At the same time that the front end surface of the latch moving body gets over the striker, the latch moving body is slid forward by the latch spring, whereby the latch moving body is inclined outward on the front end side of the latch moving body. The locking surface contacts the tip surface of the striker. In other words, the front end of the striker is locked to the locking surface in the door opening direction, and the closed state is maintained.

In the closed state, the striker is engaged with the engaging groove of the latch head as described above, and its tip is engaged with the engaging surface at the front end of the latch moving body. Even if the latch head is urged by the latch spring to rotate in the direction of disengagement from the striker, the rotation of the latch head is blocked by the striker that is locked to the locking surface. The latch movable body is retained by the striker so that the door is retained at the closed position.

When an external force in the opening direction is applied to the door in the state of holding the door closed, since the above-mentioned locking surface of the latch moving body is formed as an inclined surface, the locking surface is striker by the door-opening force. Of the latch spring retreats against the spring force of the latch spring, the latch tip moves over the striker, and at the same time the spring force of the latch spring moves the latch mobile body forward and the latch mobile body moves. Is disengaged from the striker, the latch head is rotated inward by the spring force. As a result, the engagement between the engagement groove and the striker is released, and the door is opened by the opening force.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is shown in FIG. 1 (A), which is a partially cutaway cross-sectional view in the closed state, FIG. 1 (B) is a partially cutaway cross-sectional view in the closed state, and an exploded perspective view of FIG. According to the plan view of 3,
I will explain below.

As shown in the drawing, the main body is composed of a latch body 1, a latch head 2, a latch moving body 3, and a latch spring 4. In the attached state, the latch body 1 is formed in a substantially U-shaped vertical section by the upper and lower side plate portions 1a, 1a and the inner plate portion 1b and is long in the front-rear direction (left-right direction in FIGS. 1A and 1B). Has been formed. This latch body 1
Is installed in the latch case 5 shown in FIGS. 1A and 1B. The latch case 5 is also attached to the upper and lower side walls 5a and 5a, the inner side wall 5b, and the rear wall 5a. The vertical cross section is substantially U-shaped, and the front end is the opening 5d. Therefore, the latch case 5 is connected to the open end 6a of the door 6.
By attaching to the back surface of the side, the interior latch body 1 is also fixed to the door 6.

The door 6 has one end in the widthwise direction (see FIG. 1).
(A) (the right end in (B)) is pivotally attached to the front edge of one side plate 8a of the cabinet 8 or the like by hinges 9 ...
b is openable and closable.

The latch body 1 has an inner plate portion 1b.
Since the front end portion is cut out, a stopper 1c for the latching portion 2h of the latch head 2, which will be described in detail later, is formed in the rear inner side portion of the upper and lower side plate portions 1a, 1a.

The latch head 2 includes upper and lower side plate portions 2.
The latches 1 and 2a and the inner side plate portion 2b have a substantially U-shaped vertical cross section, are incorporated in the latch body 1, and are short in the front-rear direction.

The latch head 2 has strikers 10 to be described later at the front ends of the upper and lower side plate portions 2a, 2a.
Engaging grooves 2c and 2c for engaging and disengaging the door 6 by opening and closing the door 6 are slanted from the inside of the front end toward the outside of the rear, and are provided in front of the engaging grooves 2c and 2c. The outer opening edge 2d, which is the side, is projected forward by a predetermined length longer than the inner opening edge 2e so that it can contact the striker 10 when the door is closed. Further, a locking portion 2h for the stopper 1c of the latch body 1 is formed at the rear end portion of the inner side plate portion 2b.

Next, the latch moving body 3 is formed by the upper and lower side plate portions 3a, 3a and the inner side plate portion 3b and has a substantially U-shaped vertical cross section, is long in the front-rear direction, and has the above-described latch head 2. It is formed in such a size that it can be slidably mounted in the front-rear direction, and the front end forms a closed end at the front side plate portion 3c.

In addition, at the front end of the latch moving body 3, an inclined surface 3d is formed on the inner side of the latch moving body 3 from the inner rear side toward the outer side of the front end. By inclining toward the outer side of the rear end, a locking surface 3e for the striker 10 that is symmetrically inclined with the inclined surface 3d is formed. As a result, the front end face 3f of the latch moving body 3 is provided between the inclined surface 3d and the locking surface 3e so as to project forward.

Further, in the upper and lower side plate portions 3a, 3a of the latch moving body 3, the first fixing pin 11, which will be described later, is inserted inside the vicinity of the front end thereof so as to be movable in the front-rear direction. Long window holes 3g, 3g of
A pivot 12 and a second fixing pin 13, which will be described later, are inserted into the front end and the rear end of the outer side, respectively, so as to be slidably inserted in the front-rear direction, respectively, long holes 3h, 3h, long holes 3i, 3i, Is long in the front-back direction.

The above-mentioned latch body 1, latch head 2,
The latch moving body 3 can be configured as the door latch by being assembled as follows. First, the latch head 2 having the latch moving body 3 incorporated therein is fitted in the latch body 1, and the upper and lower side plate portions 1a, 1a of the latch body 1 are provided with a shaft hole formed near the front end thereof. 1d,
The pivot 12 is inserted into one of the 1d from the outside. As a result, the upper and lower side plate portions 2a of the latch head 2,
2a, from the front end thereof, and engaging groove 2c for engagement,
After inserting the pivot shaft 12 into one of the shaft holes 2f and 2f formed so as to face the outer side of the extension line of 2c and the long hole 3h at the front end portion of the latch moving body 3 in order, In the long hole 3h in the other side plate portion 3a and the shaft holes 2f and 1d of the latch head 2 and the latch body 1,
Insert them one by one, and fix the protruding end by caulking.

Further, the pin holes 2g and 2g formed in the upper and lower side plate portions 2a and 2a of the latch head 2 closer to the inner rear end portion than the shaft holes 2f and 2f are provided with the first holes in advance.
Although the fixed pin 11 is inserted and fixed in advance, the first fixed pin 11 is inserted into the long window holes 3g and 3g of the latch moving body 3.

Further, near the rear end of the latch moving body 3, pin holes 3j, 3j are formed facing the upper and lower side plate portions 3a, 3a, and the third fixing pin 14 is inserted therethrough. After fixing, the respective ends of the latch spring 4 by tension springs are hooked and stretched on the third fixing pin 14 and the first fixing pin 11 described above, and in this state, as described above, the latch body 1
The latch head 2 is rotatably attached to the front end portion of the pivot shaft 12 and the latch moving bodies 3 are incorporated so as to be slidable in the front-rear direction.

Finally, the upper and lower side plate portions 1 of the latch body 1
a, 1a, the second fixing pin 13 is inserted and fixed in the pin holes 1e, 1e formed in the rear end portion of the latch moving body 3 and facing the rear end portion, and the long holes 3i, 3i in the rear end portion of the latch moving body 3. By doing so, the assembling is completed, but in the door latch thus configured, the latch head 2 is biased by the latch spring 4 in the clockwise direction in FIGS. 1 (A) and 1 (B). On the other hand, the latch moving body 3 is pushed and urged toward the front end side (leftward in the above figure).

The door latch is shown in FIG.
As shown in (B), with the interior of the latch case 5, the screws 7 ...
It is fixed by the stopper. On the other hand, the striker 10
In the cabinet 8 or the like, it is attached to the inner surface of the one side plate 8c in correspondence with the door latch. still,
In FIGS. 1A and 1B, reference numeral 15 denotes a knob fixed to the door 6, and reference numeral 16 in FIGS. 2 and 3 denotes a switch when the door latch is an electric lock.

Therefore, according to the door latch described above, when the door 6 is closed by the external force in the closing direction,
As shown in FIG. 4A, first, the inclined surface 3d at the front end of the latch moving body 3 contacts the tip of the striker 10, and the latch moving body 3 is, as shown in FIG.
It retreats against the spring force of the latch spring 4. As a result, the lower edges 2d, 2d of the engaging grooves 2c, 2c of the latch head 2 come into contact with the front surface of the striker 10.

When the door 6 is further closed, the front end face 3f of the latch moving body 3 gets over the striker 10. At this time, the lower edges 2d, 2d of the latch head 2 are moved by the striker. As shown in (C) from the position shown in (B) of the above drawing, it is pressed and rotated in the counterclockwise direction against the spring force of the latch spring 4 by contact with 10. The striker 10 is engaged with the combined recessed grooves 2c, 2c.

On the other hand, when the front end face 3f of the latch moving body 3 gets over the striker 10, the door 6 is closed to the closed position, and at the same time, the latch moving body 3 is pushed forward by the spring force of the latch spring 4. As a result, the locking surface 3e at the front end of the latch moving body 3 comes into contact with the tip of the striker 10, and as a result, the door 6
The latch moving body 3 moves in the opening direction of the striker 10
The door closed state is maintained by being locked to.

In the closed state shown in FIG. 1 (A),
Since the latch head 2 is urged to rotate in the clockwise direction by the spring force of the latch spring 4, the lower edges 2d and 2d of the engaging recessed grooves 2c and 2c allow the striker 10 to move inside the cabinet 8 or the like. Since the striker 10 is locked by the locking surface 3e of the latch moving body 3 in the direction opposite to this pressing force, the latch spring 2 rotates the latch head 2 in the clockwise direction. Movement is prevented, and the lower edges 2d, 2d
With the locking surface 3e, the striker 10 is sandwiched between the outside and the inside, and the closed state is maintained.

In the door closed state, when an external force is applied to the door 6 in the opening direction, the door 6 is opened by the operation opposite to the operation at the time of closing the door.
As shown in FIG. 1 (B), when the door is opened, the latch spring 2 rotates and returns the latch head 2 in the clockwise direction, and the latch moving body 3 also returns to the forward direction. Will not be retained in the state of.

[0031]

Since the present invention is configured as described above, the latch head and the latch moving body are biased by the latch spring only in one direction in which the door is opened. Therefore, even if an external force due to mischief or an error is applied, the latch head does not remain held in the closed state.Therefore, as in the conventional example, there is a problem such as damage due to the collision between the latch head and the striker. Can be resolved.

Further, since the latch head is pivotally biased by the latch spring only in the direction of pivoting when the door is opened, this striker force causes the striker to move with the latch head in the closed state. Since it is sandwiched by the body, it is possible to hold the closed door more stably and surely. Further, the attachment of the latch spring does not require high attachment accuracy as in the conventional example, so that the assembling work is easy and simple.

[Brief description of drawings]

FIG. 1 shows an embodiment of a door clutch according to the present invention,
(A) is a cross-sectional view when the door is closed in a used state, and (B) is a cross-sectional view when the door is opened in a used state.

FIG. 2 is an exploded perspective view of the above embodiment.

FIG. 3 is a plan view showing an embodiment of the same.

FIG. 4 shows a process of opening and closing a door according to the embodiment, (A).
Is a cross-sectional view of a door closing initial state, (B) is a cross-sectional view of a door closing state, and (C) is a cross-sectional view of a state immediately before the door is closed.

5A and 5B show a conventional door latch, in which FIG. 5A is a cross-sectional view when the door is open, FIG. 5B is a cross-sectional view when the door is being closed, and FIG.
[Fig. 4] is a transverse cross-sectional view in a closed state.

[Explanation of symbols]

 1 Latch Main Body 1a Upper and Lower Side Plates 1b Inner Plate 2b Inner Plate 2 Latch Head 2c Engagement Groove 2h Locking Part 3 Latch Moving Body 3d Sloping Surface 3e Locking Surface 4 Latch Spring 6 Door 6a Open End 8 Cabinet 8b Opening Part 8c side plate part 10 striker 11 first fixing pin 12 pivot 13 second fixing pin 14 third fixing pin

Claims (1)

[Claims] 1. A latch main body attached to an open end of a door which is pivotally attached to an opening portion of a cabinet or the like so as to be openable and closable, and a front end side inside the latch main body, Proximity to the back of the door by pivoting on the upper and lower side plates,
Inside the latch body and the latch head, which are rotatably supported in the separating direction, and inside the latch body and the latch head, there are upper and lower side plate portions, and the front end portion and the rear end portion side thereof respectively in the front-back direction. Each of the elongated holes is provided with the above-mentioned pivot axis,
Insert the second fixing pin installed on the rear of the latch body,
A latch moving body arranged so as to be slidable in the front-rear direction,
A third fixing pin erected on the rear end of the latch moving body,
Between the latch head and the first fixing pin installed on the rear end portion inside the shaft support portion, a turning force to the rear end side is applied to the latch head, and a front end side is applied to the latch moving body. Tensioned with a latch spring that urges each pushing force to
The latch head, at the front end thereof, is provided with a long slant in the front-rear direction and is recessed, and a striker projecting from the inner surface of the side plate of the cabinet or the like is engaged with a recessed groove for engagement so as to be detachable. On the rear end side of the inner side plate portion, at a position where the front end of the inner side plate portion of the latch body can be brought into contact with the front end and the striker can be engaged with the engagement groove by coming into contact with the front end. A latching portion that holds the latch head is formed, and on the other hand, the latch moving body is capable of contacting the striker inside the front end of the latch moving body when the door is closed, and the striker. So that the latch moving body can retreat against the spring force of the latch spring by abutting with, the inclined surface inclined from the inner rear end portion toward the front end outer side, and the protruding end of the inclined surface toward the front end side. From the outer rear end side A latch for a door, wherein a slanted striker locking surface is formed, and the striker is configured to be sandwiched and held by the engaging groove of the latch head and the locking surface of the latch moving body. .