JPH0531180Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a security lock that prevents a security lock locked from the indoor side of a door from being unlocked from the outside.

[Conventional technology]

In conventional security locks, as shown in the technology described in Japanese Patent Application Laid-Open No. 62-50573, when the door is locked, the joint pin at the tip of the security lever is inserted into the hole in the strike provided on the frame side, and the door is locked. When the door is opened, the joint pin moves along the vertical hole while being engaged with the vertical hole connected to the receiving hole, but the amount of movement of the joint pin is limited by the length of the vertical hole, so the opening degree of the door is limited. The width is limited so that outsiders cannot enter, making it impossible to enter illegally from the outside.

[The problem that the idea attempts to solve]

The security locks used to prevent illegal entry by robbers and the like have the following drawbacks.

Since the opening angle of the door is restricted, an outsider cannot enter the room, but one arm can enter, so if the door is closed after turning the thumb turn in the unlocking direction with one arm, the door can be removed from the joint pin hole. There was a problem that the door could be opened and the security lock could be unlocked incorrectly.

The present invention has been made to solve this problem.

[Means to solve the problem]

The gist of the present invention is to prevent the security lock from being unlocked when the door is open, and is similar to the conventional security lock in that it has a lock case, lock plate pin, security lever, and hub. However, a flat surface is provided on the outer peripheral surface of the lock plate pin, a cam is provided on the outer surface of the hub, and an engagement recess that engages with the cam is provided so that the lock plate pin can move forward and backward relative to the front, A push plate having a pusher that pushes the precaution lever when moving forward is provided, one end is biased in a direction to press against the plane, and when one end is pushed, the other end protrudes into the retreat path of the push plate. A return plate was installed to

[Effect]

The action of the precautionary lock constructed as described above is as follows.

[Lock operation and lock state]

When the thumb turn is turned in the locking direction from inside the room with the door closed, the rotation of the hub causes the drive lever that engages with the cam of the hub to push and drive the push plate in the front direction, causing the pusher of the push plate to move forward. When the lever is pushed to the outside of the door, the joint pin of the precaution lever engages the strike, locking the precaution lock and limiting the amount the door can be opened.

When the door is opened from outside, the guard lever tilts using the lock plate pin as a fulcrum, and the return plate changes from flat contact to the outer peripheral surface of the lock plate pin and is pushed into the lock case, causing the push plate to move in the unlocking direction. cut off.

Therefore, even if an outdoor person inserts one arm into the room and tries to turn the thumb turn in the unlocking direction, the thumb turn will not turn.

Thus, it is impossible to illegally unlock the security lock from the outside.

[Unlocking from indoors]

When the door is closed, the precaution lever returns to its previous tilt angle, the return plate is pressed against the flat surface again, and the path of the push plate in the unlocking direction is no longer blocked, and the precaution lock can be unlocked by thumbturn operation on the inside of the room. becomes.

〔Example〕

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

FIGS. 1 to 3 are partially cutaway front views of a box lock with a safety lock with the lid removed.

As shown in FIG. 1, a lock case 1 is installed inside the door end, and holes 5 are bored in the fronts 2, 3 and second front 4, which are on the door end side of the lock case.
A lock plate pin 6 is inserted in a tiltable and rotatable manner, and a joint pin 8 that engages with a strike A on the frame side is provided at the other end of a guard lever 7 which has the lock plate pin 6 attached to one end.

The lock plate pin 6 is provided with a large diameter portion 9 on the opposite side of the guard lever 7, and a flat surface 10 is carved on the outer peripheral surface of the large diameter portion 9 on the side closer to the lock case 1. A spring 11 is attached between the side surface and the second front 4, and the precaution lever 7 is urged toward the front 3 side.

Below the lock plate pin 6 is a lock case 1.
A U-shaped spring support member 12 is attached to the inner wall surface of the upper wall 12a and the lower wall 1 of the spring support member 12.
A return plate 13 is vertically movably fitted into a rectangular hole 12c provided in 2b.

As shown in the perspective view of FIG.
Since the width is wider than the size of the hole a, the vertical movement stroke is limited, and the middle part 13b and the lower wall 12b
Since the spring 14 is inserted between the upper end 13a and the upper end 13a, the upper end 13a is pressed against the flat surface 10.

A square shaft of a thumb turn (not shown) is fitted into a square hole 15a provided in the center of the hub 15, which is rotatably inserted into the lock case 1, and when the thumb turn is turned from the indoor side, the hub 15 rotates. I'm starting to do that.

The hub 15 has four side walls 1 having a substantially rectangular outer shape.
5b, 15c, 15d, 15e, and the side wall 15
A protruding cam 16 is provided at d.

An intermediate portion of a spring 18 is fitted into a pin 17 installed in the lock case 1, one end 18a of the spring 18 is pressed against a side wall 15b of the hub 15, and the other end 18b is pressed against a dead bolt 19.

Therefore, the hub 15, which rotates by the thumb turn operation, presses the spring 1 against the side wall 15b or 15c.
8 to the unlocking angle (see FIG. 1) or the locking angle (see FIG. 2).

A drive lever 21 whose one end is pivotally connected to a pin 20 installed in the lock case 1 has a concave engagement portion 22 at the other end.
is formed, and when the hub 15 rotates counterclockwise in FIG. ing.

The drive lever 21 is provided with a long hole 23, into which a shaft portion 25 protruding from a push plate 24 is fitted.

The push plate 24 is provided with protruding shaft parts 28 and 29 that are fitted into horizontal holes 26 and 27 provided in the lock case 1 (see FIGS. 1 and 2). It is possible to move forward or backward relative to 2.

Opening 30 provided in push plate 24
, a pin 31 provided on the lock case 1 protrudes, and a shaft portion 32 provided on the push plate 24 protrudes.
One end of the spring 33 is wound around the pin 31, and the other end of the spring 33 is wound around the pin 31 (see FIG. 2).

Therefore, the push plate 24 is urged toward the forward movement end or the backward movement end.

A protrusion 34 protruding toward the return plate 13 is provided at the upper end of the push plate 24 on the forward side, and a pusher 36 passing through a hole 35 provided in the front 3 is provided at the lower end of the push plate 24 on the forward side.

The strike A provided on the frame side has a hole 37 at a position opposite to the joint pin 8 when the door is closed.
is provided, and a vertically elongated hole 38 is provided above the hole 37 (see FIG. 5).

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

(Unlocked state) When the thumb turn is operated from the indoor side in the unlocking direction, the hub 15 is at the unlocking angle rotated counterclockwise as shown in FIG. 33 and is in the unlocked position at the backward movement end.

The caution lever 7 is pressed against the front 3 side by the spring 11, and the joint pin 8 is pressed against the strike A.
The guard lock is in an unlocked state after being removed from the hole 37.

The lower end of the return plate 13 in pressure contact with the plane 10 has a gap S ₁ in the vertical direction with respect to the upper end of the projection 34 .

(Locking) When the thumb turn on the indoor side is operated in the locking direction when the lock is in the unlocked state as described above, the hub 15 rotates counterclockwise and the cam 16 engages, as shown in FIG. 22 , the drive lever 21 rotates clockwise, the push plate 24 having the shaft portion 25 that engages with the elongated hole 23 is pushed in three front directions, and the pusher 36 moves the caution lever 7 . When pushed, the precaution lever 7 tilts outward of the lock case 1 using the lock plate pin 6 as a fulcrum, and the joint pin 8 fits into the hole 37 of the strike A, and the precaution lock is locked.

Due to the tilting of the precaution lever 7, the large diameter portion 9 also tilts downward, and the return plate 13 is pushed down slightly.
There is a gap S ₂ in the vertical direction between 4 and 4.

(Locked state) When a door with a security lock is opened, the joint pin 8 engages from the hole 37 into the vertically long hole 38, and when the joint pin 8 reaches the upper end of the vertically long hole 38, the door stops opening. (See Figures 3 and 5).

Since the joint pin 8 has reached the upper end of the vertically elongated hole 38, the large diameter portion 9 rotates and the outer peripheral surface of the large diameter portion pushes the return plate 13, as shown in FIG. 6, which is the view of the X arrow in FIG. movement, return plate 13
The lower end of the push plate 24 descends to the right side of the protrusion 34 (see FIG. 3).

Therefore, even if you insert one arm into the door whose opening amount is restricted from the outside and try to turn the thumb turn on the indoor side in the unlocking direction, the engaging portion 22 is pushed to the right by the cam 16. The projection 34 of the lever 21 that presses the push plate 24 to the right hits the return plate 13, making it impossible to turn the thumb turn to the unlocking angle.

Therefore, the pusher 36 remains protruding from the front 3, and the safety lock is never unlocked.

(Unlocking) When the door is closed and the thumb turn is operated from the indoor side in the unlocking direction, there is a vertical gap of S ₂ between the lower end of the return plate 13 and the protrusion 34, so the cam 16 The drive lever 21, which has been pushed by the engaging portion 22, rotates counterclockwise, and the push plate 24 moves backward, returning to the state shown in FIG.

[Effect of idea]

In this way, there is no danger that the locked security lock will be unlocked illegally from outside, and the lock can only be unlocked from outside, thereby completely eliminating intrusion by burglars and the like.

Therefore, it is completely safe for occupants of the room to lock the security lock, open the door, and use the door for ventilation.

Furthermore, the present safety lock has the advantage of having a small number of components and a simple structure.

[Brief description of the drawings]

Figures 1 to 6 show embodiments of the present invention;
The figure is a partially broken front view of the guard lock in the unlocked state, Figure 2 is a partially cutaway front view of the guard lock in the locked state, and Figure 3 is a partially broken front view of the guard lock in the locked state when the door is opened. Front view, Figure 4 is a perspective view of the return plate, Figure 5 is a perspective view of the return plate.
The figure is a schematic diagram showing the relationship between the precaution lever and the strike when the door is opened in a locked state. Figure 6 is the X in Figure 3.
It is an arrow view. A...Strike, 1...Lock case, 2, 3...
...Front, 6...Lock plate pin, 7...
Caution lever, 8... Joint pin, 9... Large diameter portion, 10... Plane, 12... Spring support member, 13
...Return plate, 15...Hub, 16...
Cam, 21... Drive lever, 22... Engaging portion, 2
4...Push plate, 34...Protrusion, 36...
...Pushya, 37...hole, 38...vertical hole.

Claims (1)

[Scope of utility model registration request] A lock case installed inside the end of the door, a lock plate pin that is tilted and rotatably inserted into the front of the lock case and has a flat surface on its outer peripheral surface, and the lock plate pin is attached to one end. a guard lever having a joint pin on the other end that engages with the strike; a hub that is rotatably fitted into the lock case and has a cam on its outer surface; one end is pivotally connected to the lock case and the other end is connected to the cam. a pusher plate having a drive lever that engages with the drive lever; a pusher plate that engages with the drive lever and is provided so as to be able to move forward and backward with respect to the front, and that pushes the precaution lever when moving forward; and a return plate which is biased in a direction to press against the push plate and whose other end protrudes into the retreat path of the push plate when one end is pushed.