JPH0527649Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is characterized in that when the door is unlocked, the latch head retreats or rotates as the door closes or opens, and when the door is locked, the locking surface of the latch head is in an upright state. This relates to the improvement of a reversible latch lock that is fixed with a strike and locked with a strike, and more specifically, it prevents the door from rattling by strengthening the upright force of the locking surface of the latch when unlocking. This relates to latch locks.

[Prior Art] General latch locks have a latch head that retracts from the edge of the door, and when the door is opened, the latch head is inserted into the door by operating a door knob or lever handle. ing.

On the other hand, with reversible latch locks, the latch head is not only retractable into the lock case, but also rotatable, so the raised locking surface that engages with the engagement hole of the strike is The latch head is retracted by the component of the pressing force acting on the sloped surface, so when the door is unlocked, you can simply push the door without operating the door knob or lever handle. It is convenient because it can be opened and closed.

FIG. 6 shows a cross-sectional view of the essential parts of a reversible latch lock having an extremely simple structure, in which the protrusion 3 of the latch head 2 is inserted into the interior of the lock case 1.

As shown in FIG. 7, the shape of the latch head 2 includes protrusions 3 on both sides, a locking surface 5 perpendicular to the rear surface 4, and an inclined surface 6 on the opposite side of the locking surface 5. , the tips of the locking surface 5 and the inclined surface 6 protrude from the lock case 1.

A retractor 7 is slidably inserted into the lock case 1 , and a spring 9 is inserted between the spring receiver 8 provided in the lock case 1 and the retractor 7 . Press.

The retractor 7 has a stopper pin 10 protruding from the opposite side of the front end surface, and when the latch lock is locked, the stopper pin 10 is prevented from retreating, and when the latch is unlocked, the stopper pin 10 can be retreated.

The operation when the reversible latch lock constructed as described above is unlocked is shown in FIGS. 4 and 5.

As shown in FIG. 4, when the end of the door moves in the direction of symbol A and the door is closed, the latch head 2 is in the _R1 position and the inclined surface 6 hits the strike S, and the pressing force acting on the inclined surface 6 is increased. Component force F
As a result, the latch head 2 moves back against the spring 9 ( _R2 position) and engages in the engagement hole 11 of the strike S ( _R3 position).

When the door is opened, the end of the door is pushed in the direction B, as shown in _FIG .
The latch head 2 hits the side wall surface of the engagement hole 11 of the
is tilted, and the locking surface 5 is tilted (R ₄ position).

A component F of the pressing force acts on the inclined locking surface 5, causing the latch head 2 to retreat ( _R5 position) and the door to open.

In this way, when the reversible latch lock is unlocked, the door can be opened and closed by lightly pressing the door, making the opening and closing operations of the door extremely easy.If the reversible latch lock has the structure shown in Figure 6, The structure is simple and can be downsized.

[The problem that the idea attempts to solve]

In a reversible latch lock, when the door is closed as shown in FIG. 4, it is desirable that the latch head retract smoothly with a small closing force.

In other words, the weaker the force of the spring 9, the better.

However, if the force of the spring 9 is weak, the latch head 2 tends to rotate about the protrusion 3 as a fulcrum, causing the door to rattle easily and causing problems such as the door opening by itself due to wind pressure.

That is, in order to hold the door in the closed state, it is necessary to increase the force of the spring 9 to a certain extent, and if the force of the spring 9 is increased, the problem that the closing operation becomes difficult cannot be avoided.

The object of the present invention is to solve the above-mentioned problems while maintaining the compact structure of the miniaturized reversible latch lock as shown in FIG.

[Means for Solving the Problems] In order to achieve the above object, a spring is provided inside the latch head to bias the locking surface of the latch head in the direction of standing up.

[Effect]

When the door is closed, a component of the closing force acts on the inclined surface of the latch head, causing the latch head to retreat against the spring, but by weakening this spring force, the door can be easily closed with a small closing force.

At this time, the force of the spring that biases the locking surface of the latch head in the direction of standing up does not affect the retraction of the latch head.

When a force in the door opening direction is applied to the door, the spring biased in the direction of raising the locking surface strengthens the force for preventing the locking surface from tilting.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

Note that the same parts as in the conventional example are given the same reference numerals.

Figure 1 is a cross-sectional view of a reversible latch lock;
FIG. 2 is a longitudinal sectional view thereof.

In the same figure, a lock case 1 is installed inside the end of the door D, a front 12 is attached to the front of the lock case 1, a latch insertion hole 13 is bored in the front 12, and a latch insertion hole 13 is formed in the middle of the lock case 1. A spring receiver 8 is formed by cutting and raising the side wall inward.

Latch head 1 inserted into latch insertion hole 13
4 is composed of a latch cover 15 and a latch body 16, as shown in the perspective view of FIG. Part 1
5a and 15b to form a latch head 14 having a space inside.

The external shape of the latch head 14 is the same as that of the conventional latch head 2, and has a locking surface 5 on one surface and an inclined surface 6 on the other surface, and a spring 1 in the internal space.
7 is inserted (see Figure 1).

The latch head 14 is rotatable about the protrusion 3 inserted into the lock case 1, and one end 17a of the spring 17 protruding from the opening 18 of the latch head 14 hits the inner wall surface of the lock case 1 and the latch head 14 is locked. Forced in the 5-plane direction.

The protrusion 3 is slidable along the inner wall surface of the lock case 1, and the tip of the latch head 14 is retractable into the lock case 1.

A retractor 7 is slidably inserted into the lock case 1 behind the latch head 14.
The front end surface of the retractor 7 is pressed against the rear surface of the latch head 14 by the spring 9 inserted between the retractor 7 and the spring receiver 8.

A stopper pin 10 is provided on the opposite side of the distal end surface of the retractor 7.

A stopper block 19 rotatably fitted into the lock case 1 is provided with a square hole 20 at the center of rotation, and a thumb turn 22 inserted into an inside body 21 installed on the indoor side of the door D. A square shaft 23 at the tip and a square shaft 26 at the tip of an emergency plug 25 inserted into an outside body 24 installed on the outdoor side of the door D are fitted into the square hole 20.

Lock case 1 is located behind the stopper block 19.
A pressing piece 27 that can slide inside is provided, and the pressing piece 2
7 is pressed into contact with the stopper block 19 by a spring 28 fitted between the rear wall of the lock case 1 and the pressing piece 27.

The stopper block 19 has pressed surfaces 29 and 30 that intersect at a substantially right angle.
When the lock rotates in the unlocking direction, the pressed surface 29 collides with the pressing piece 27 and is maintained at the unlocking angle, and the hole 31 drilled in the stopper block 19 becomes concentric with the stopper pin 10, and the stopper pin 10 is hole 3
It can be inserted into 1.

Further, when the stopper block 19 rotates in the locking direction, the pressed surface 30 abuts against the pressing piece 27 to maintain the locking angle, and the stopper surface 32 on the opposite side of the pressed surface 30 is held at the tip of the stopper pin 10. The stopper pin 10 is arranged close to the stopper pin 10 to prevent the stopper pin 10 from retreating.

The operation of the latch lock configured as above will be explained.

[Closing door when unlocked]

The stopper block 19 is maintained at an unlocking angle in which the pressed surface 29 is pressed by the pressing piece 27, and the stopper pin 10 is in a state where it can be inserted into the hole 31 (see FIG. 2).

The latch head 14 whose rear surface 4 is pressed by the retractor 7 causes the locking surface 5 to stand up and protrude.
The locking surface 5 is biased by the spring 17 in the direction in which it stands up.

The operation of the latch head 14 when the door is closed is as follows:
The operation is similar to that of the conventional example explained in FIG.

At this time, one end 17a of the spring 17 slides on the inner wall surface of the lock case 1 as the latch head 14 retreats, so that the latch head 14 retreats only against the small pressing force of the spring 9.
can be closed with a light closing force.

[Opening the door when unlocking]

The operation of the latch head 14 when the closed door D is opened is similar to the operation of the conventional example described in FIG.

At this time, since the locking surface 5 of the latch head 14 is tilted against the small pressing force of the spring 9 and the rotation biasing force of the spring 17 in the direction of the locking surface 5, the door opening force is greater than the door closing force. It becomes necessary.

Therefore, even if a small external force is applied to the door D, the locking surface 5 is maintained in an upright state, thereby preventing the door D from rattling or being suddenly opened.

[When locked]

When the thumb turn 22 is turned in the locking direction after closing the door, the stopper block 19 is engaged with the square shaft 23.
rotates, the pressed surface 30 comes into pressure contact with the pressing piece 27, and the stopper surface 32 approaches the tip of the stopper pin 10, so that the latch lock is in a locked state.

When trying to open the door D in such a state, the locking surface 5 hits the strike S, but the stopper pin 1
0 hits the stopper surface 32, and the retractor 7 is prevented from retreating.

At this time, the stopper pin 10 moves back by the gap between the stopper pin 10 and the stopper surface 32, so the locking surface 5 tilts by a slight amount.
Although a slight rattling occurs in the door D, since the locking surface 5 is biased in the direction of standing up by the spring 17, there is an effect of buffering the rattling of the door D.

〔effect〕

Since the present invention is configured as described above, it produces the effects described below.

(a) When the door is closed, the locking surface of the latch head is spring-biased in an upright state, both when the door is unlocked and when the door is locked, so rattling is dampened.

(b) For the same reason as above, the problem of unlocked doors suddenly opening due to wind pressure has been eliminated.

(c) When closing the door, the spring force that holds the locking surface in the upright position does not act, so the door can be easily closed by simply pushing the door lightly.

(d) Since the spring that biases the locking surface in the upright direction is provided inside the latch head, the reversible latch lock does not become large and can be made compact.

[Brief explanation of the drawing]

Figures 1 to 3 show embodiments of the present invention;
The figure is a cross-sectional view of the reversible latch lock, Figure 2 is a longitudinal cross-sectional view of the same as above, Figure 3 is a perspective view of the parts that make up the latch head and the spring inserted inside, and Figure 4 is the latch head when the door is closed. Schematic diagram for explaining the operation of
FIG. 5 is a schematic diagram for explaining the operation of the latch head when the door is opened, FIG. 6 is a cross-sectional view of essential parts of a conventional reversible latch lock, and FIG. 7 is a perspective view of the conventional latch head. S...Strike, 1...Lock case, 2,14
...Latch head, 3...Protrusion, 4...Rear surface,
5... Locking surface, 6... Inclined surface, 7... Retractor, 9... Spring, 10... Stopper pin, 11
...Engagement hole, 15...Latch cover, 16...Latch body, 17...Spring, 19...Stopper block, 20, 23...Square hole, 22...Thumb turn, 25...Emergency plug, 27...
Pressing piece, 29, 30... Pressed surface, 31... Hole,
32... Stopper side.

Claims (1)

[Scope of utility model registration request] It has a lock case built into the end of the door, and a protrusion inserted into the lock case so that it can move forward and backward as well as rotate, with a locking surface on one side of the tip protruding from the case and a locking surface on the other side. A latch head having an inclined surface, a spring provided inside the latch head to press the tip of the latch head toward the locking surface, and a spring slidably inserted into the lock case to press the rear surface of the latch head. a retractor having a stopper pin erected in the direction opposite to the latch head; a stopper surface pivotally connected to the lock case and close to the stopper pin when at the locking angle; A latch lock comprising a stopper block having a hole through which a stopper pin can be inserted.