JPH0323498Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention regulates the opening angle of the door as necessary to prevent illegal intruders from entering, and to ensure safety when opening the door. This relates to a type guard arm type security lock.

(Prior art and its problems) As a conventional tilting guard arm type security lock,
Special Publication No. 45-33584 or Japanese Patent Publication No. 57-
There is a structure described in Publication No. 180769, in which the tip of the lock is inserted into the large diameter part of the upper end of the elongated hole of the arm that is pivoted to the door frame, and the lock is engaged when the door is opened. When moving horizontally, the tip of the lock slides inside the long hole and stops at the end of the long hole at the same time as the arm tilts, in order to obtain the required opening angle of the door with one arm. The tilting angle of the arm is increased.

In other words, when the door is closed, the distance between the pivot point of the arm and the tip of the lock rod is shortened to increase the tilting angle of the arm, so when the door begins to open, the lock rod moves slightly horizontally. , the free end of the arm moves a lot, and in the middle of opening the door,
It will protrude outward from the outside surface of the door.

In other words, in security locks with this type of structure, the free end of the arm protrudes outside the door surface when the door is first opened, which not only looks unsightly, but also poses a risk of the protruding part getting caught on the human body or clothing. There is a risk of the lock being broken by being attacked, and when using a security lock, it is necessary to have a partial carving (gap) at least equal to the thickness of the arm in the gap between the door frame and the door.
A large gap will be created between the door and the door frame. In the case of outward-swinging doors, if a crowbar, etc. is inserted through this gap and the door is broken, the door frame, door, lock, or arm will become deformed and the lock and arm will disengage, allowing the door to be opened illegally. To prevent this, outward-opening doors must be provided with a joining part to hide this gap, but as mentioned above, when the door is first opened, the free end of the arm will protrude outside the door surface. Therefore, outward-opening doors had a fatal flaw in that it was impossible to provide a meeting point, which is important for flood prevention.

Next, there is a guard lock with a non-tilting Garto arm type, which has the structure described in Japanese Utility Model Publication No. 52-35274, but this is a linear extendable type that uses a telescopic rod instead of a door chain, and is horizontal. Since it only extends in one direction, if the width of the door frame to which the base is attached is narrow, the number of telescopic rods must be increased in order to obtain the required opening angle of the door, resulting in high production costs. Not only that, but if you push the door a little in the direction of closing with the telescopic rod fully pulled out, the lock will come to the position of the slit in the telescoping element where the lock can come out, so at this time, the lock will come out from the gap in the door. If the user inserted his/her hand and turned the thumb turn to operate the lock, the lock would easily come off the slit and there was a risk that the lock could be illegally unlocked.

In short, conventionally known guard arm-type safety locks, regardless of whether they are tilting or non-tilting, are practically impossible to implement.

(Purpose of the invention) The object of the invention is to solve the problems of the above-mentioned prior art and to provide a practically practicable tilting guard arm type security lock.

(Disclosure of the invention) The security lock according to the invention has a lock case in which a lock rod with a locking part at the tip is removably fitted, and a lock case is attached to the door, and one end of a telescopic guard arm is attached to the door frame side. A movably pivoted mounting plate is attached, and the guard arm is made up of a first arm on the pivot side and a second arm that is attached to the first arm so as to be able to slide a fixed length only in the longitudinal direction. When the guard arm is at its shortest, the locking portion of the lock rod fits into the free end of the second arm, and when the guard arm rotates, the locking portion engages with the peripheral edge of the lock rod. It is characterized by having a hole in a shape that makes it impossible to retreat.

(Example) An example illustrating the structure of the security lock according to the present invention will be described in detail.

In other words, 1 is a lock case that is attached to the door A by being flush or buried. Inside the lock case, there is a cylinder lock from the outside of the door, and from the inside of the door, the lock lever 2 has two stages of maximum and minimum by operating a thumb turn. At the tip of the lock rod 2, there is a flan-shaped locking portion 3 having a surface constriction larger than the cross-sectional area of the lock rod.
are integrally formed. Reference numeral 4 denotes a mounting plate that is attached to the door frame, and is provided with a fitting hole 4 into which the locking part 3 is fitted when the lock rod 2 protrudes to the maximum when the door is closed. Full locking is performed by fitting the part 3. Reference numeral 5 designates a first arm constituting a guard arm G, one end of which is pivoted ₅₁ on the lower end side of the mounting plate 4, and an elongated hole ₅₂ is formed in the center thereof in the longitudinal direction. Reference numeral 6 denotes a second arm connected to the first arm ₅ via a pin 7 inserted through the elongated hole 5 2 , and is adapted to slide by a distance that allows the pin 7 to move within the elongated hole 5 ₂ . Bent parts 6 ₁ , 6 ₁ are formed so as to embrace both ends of the first arm 5 so that it does not bend during sliding, and the first arm 5 is When the guard arm G and the second arm 6 overlap, that is, when the length of the guard arm G is at its minimum, the fitting hole 4 of the mounting plate 4
A hole 6 ₂ slightly larger than the size of the locking part 3 is bored at a position that coincides with the size of the locking part 3 , and the locking part 3 is configured to fit into the fitting hole 4 through this hole 6 ₂ when locking. ing.

8 is a return spring that returns the guard arm G, that is, the first and second arms 5 and 6 to their original positions when the door is closed; 9 is a back plate that covers the back surface of the mounting plate 4;

(Function of the invention) Next, according to the above structure of the invention, the action of the safety lock of the invention will be explained with reference to the illustrated embodiment.

That is, when the thumb turn (not shown) provided on the indoor side of the lock case 1 attached to the door A is fully rotated in the locking direction when the door is closed and the lock rod 2 is extended to its maximum extent, the tip of the lock rod is engaged. The stop part 3 is the second arm 6
In order to fit into the fitting hole ₄₁ of the mounting plate 4 through the hole ₆₂ , the door A is engaged with the door frame B via the locking rod 2,
The door becomes locked and cannot be closed.

When the thumb turn is returned one step in the unlocking direction, the amount of protrusion of the lock rod 2 becomes the minimum and the locking part 3 separates from the fitting hole 4, making it possible to open the door, but the locking part 3 is still fitted into _the hole ₆₂ of the second arm 6, as shown in FIG. The arm 6, that is, the guard arm G, is swung about the pivot ₅₁ as a fulcrum as shown in FIGS. 9a and 9b, but at this time, the guard arm G is simply tilted as it is due to the horizontal movement of the lock 2.

When the door is further pushed in the opening direction, a component force is applied to the second arm 6 in the direction away from the pivot shaft ₅₁ . 5 It slides and stretches while being guided by ₂ .
When the pin 7 reaches the end of the elongated hole ₅₂ as shown in FIG. 10, the door is in a so-called half-open state where it cannot be opened any more. At this time, the locking part 3 only moves horizontally together with the lock case 1, its state remains unchanged, and the direction of the hole ₆₂ changes depending on the inclination of the second arm 6, so that when the lock rod 2 is moved backward, Even if you insert your hand into the door gap from the outside of the door and try to turn the thumb turn in the unlocking direction, the locking part 3 comes into contact with the periphery of the back of the hole ₆₂ and prevents the lock 2 from moving back, so the lock cannot be unlocked. It's impossible.

When the door is closed in this half-open state, the state shown in FIGS. 1 and 2 is restored by the reverse operation. After the return, the hole ₆₂ of the second arm 6 has returned to a state where the locking part 3 can pass through, so if you want to lock it again, turn the thumb turn in the locking direction where the lock lever 2 protrudes the most and unlock the door. If you want to fully open the lock, just rotate the thumb turn in the unlocking direction.

(Effect of the invention) According to the security lock according to the invention, a so-called telescoping guard arm is adopted in the tilting guard arm type security lock, where the guard arm extends when the door is opened and contracts when the door is closed. , it is not necessary to use a long guard arm to obtain the required opening angle of the door, and unlike conventionally known tilting type guard arms, the free end of the guard arm protrudes outside the door surface when the door is opened. There is no need to increase the number of telescoping members as in the case of a guard arm, and there is no need to increase the number of telescoping members as in the case of a linearly telescoping type guard arm. It is possible to provide a highly practical safety lock that is compact in appearance, has a good appearance, and has no risk of flooding.

In addition, FIGS. 5 to 7 show other embodiments of the present invention, in which the first arm 5 is made of two members having a hole through which the pivot shaft ₅₁ is inserted, and the part of the hole is caulked. It is formed into a sheath-like shape so that the second arm 6 can slide in the hollow part of the interior. tension spring 10 between
The second arm 6 is always biased to be drawn into the first arm 5 through the arm 10. As shown in FIGS. 5 and 6, the first arm and the second arm are integrated so that the hole of the first arm 5 is aligned with the shaft hole 4 formed in the upper part of the mounting plate 4. The first and second arms 5, ₆ are attached to the mounting plate 4 by inserting the pivot shaft 51 into this common hole via the torsion spring 8 for placing and returning, and fixing it with a retainer. The effect is exactly the same as that shown in the first embodiment, but since the first arm is in the form of a sheath, there is no need for a guide pin or elongated hole, and there is no need for a tensile force to pull in the second arm. Since the spring is provided, there is an advantage that the return can be carried out smoothly.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, and the first
The figure is a side view of the proposed precautionary lock, and Figure 2 is Figure 1 A-A.
3 is a sectional view taken along line B-B in FIG. 2, FIG. 4 is a sectional view taken along line C-C in FIG. 3, and FIG. 6 is a longitudinal sectional side view of the same part, Fig. 7 is a longitudinal sectional side view of the same main part with the pivot fitted, and Fig. 8 is a front view of the security lock of the first embodiment when the door is closed. FIG. 9a is a partially sectional plan view showing the relationship between the lock rod and the guard arm in the middle of opening the door of the same precautionary lock, and FIG. A sectional view taken along line A-A in Figure 1 when the door is in the maximum opening state with the same precautionary lock, and Figure 1A is in Figure 1 when the door is in the maximum opening state with the same precautionary lock.
- It is a sectional view along the A line. 1... Lock case, 2... Lock rod, 3... Locking part,
4... Mounting plate, 4... Fitting hole, G... Guard arm, 5... First arm, 6... Second arm, 6...
... hole, 7 ... pin, 8 ... return spring, 9 ... back plate, 10 ... tension spring.

Claims (1)

[Scope of utility model registration request] A lock case in which a lock rod with a locking part at the tip is retractably fitted is attached to the door, and a mounting plate on which one end of a telescopic guard arm is rotatably supported is attached to the door frame side. The arm consists of a first arm on the pivot side and a second arm that is attached to the first arm so that it can slide a certain length only in the longitudinal direction, and a guard is attached to the free end of the second arm. A hole is formed in such a shape that the locking part of the lock rod fits in when the arm is at its shortest, and when the guard arm rotates, the locking part engages with the peripheral edge of the back surface, making it impossible for the lock rod to move back. A precautionary lock characterized by being punctured.