JP4200241B2 - Cam feed prevention mechanism - Google Patents

Description

    The present invention relates to a technique for preventing cam feed, which is one of unauthorized unlocking of a lock.

Since around 1998, there have been many occurrences of unlocking that have not been seen before.
One of them is unauthorized unlocking by cam feed.
In cam feed, a wire is inserted through a hole opened in the door to attach a lock or a clear space around the lock latch bolt, and the dead cam is pushed or pulled, and the dead cam is rotated to unlock the lock.
In the near future, drills will be used to drill holes in doors and lock cases, and cam feeding from these holes will also occur.

At present, no effective cam feed lock has been found yet, and there seems to be little technology in this field.
One of them is Japanese Patent Application No. 2004-205336. This is not to divide the dharma into cylinder dharma and cam dharma, but with a dharma, a dharma holder is provided outside the dharma and the dharma is fixed to the dharma holder. The lock can be released only when the cylinder is turned with the key.
Japanese Patent Application No. 2004-205336

As a problem of Japanese Patent Application No. 2004-205336, a difference occurs between the rotation angle of the key and the rotation angle of the dharma, and the rotation angle of the dharma becomes smaller than the rotation angle of the key.
If possible, I want to make the rotation angle of the key and the rotation angle of the dharma the same.
Or I want to make the Dharma rotation angle larger than the rotation angle of the key.
We would also like to realize a technology that can effectively prevent cam feed by another method.
We want to be able to use the technology suitable for the lock by having many prevention technologies.

In the locked state, I thought that I couldn't turn the dharma with the dead cam to put in and out the dead bolt (3).
As a means of doing this, it is divided into a dharma for assembling the cylinder shaft and a dharma with a dead cam, and both dharmas are connected by gears. I thought no mechanism.

A cam feed preventing mechanism according to claim 1 will be described with reference to FIGS.
A gear (11) is provided at a fixed portion of the outer periphery of the cylinder dharma (5) for combining the cylinder shaft, and a gear (10) is provided at a fixed portion of the outer periphery of the cam dharma (8) having a dead cam (9) for inserting and removing the dead bolt (3). And is a combination of both dharmas to be linked with gears.

When the cylinder dharma (5) is turned to the locking side using the key, the cam dharma (8) is rotated, and when the cam dharma protrudes the dead bolt, the gears of both dharmas are not engaged with each other.
FIG. 2 shows this state. In the state of FIG. 2, the cylinder dharma can rotate to either the left or right, but the cam dharma does not rotate to either the left or right side.
That is, in this state, the cam cannot be fed by operating the dead cam or cam dharma.

To unlock, turn the cylinder dharma to the unlocking side, and when the gear teeth of both dharma mesh, the cam dharma automatically rotates and retracts the dead bolt.
At this time, a gear engaging pusher (14) having a gear engaging spring (15) plays an important role in engaging both gears. In the locked state, the dead cam (9) is engaged with the gear toward the unlocking side and pushed by the pusher, so that both gears can be smoothly meshed during unlocking.

  There is also a requirement for the strength of the gear biting spring. It is necessary to make the spring stronger than the locking spring (18) returning the locking pin (17). If it is weak, even if the cylinder dharma is turned to the unlocking side, both gears do not mesh, only the cylinder dharma turns, and the cam dharma does not turn.

Further, when the dead cam protrudes at the time of locking, if a play (20) is provided in a portion where the dead cam (9) hits the dead bolt, there is an effect on the dead bolt being pushed in.
The click spring (16) secures the play.

The mechanism in which both darumas are linked by gears can freely change the angular ratio of rotation of both darumas by changing the diameters of both darumas. This solves one of the problems.

In the mechanism according to the first aspect, the cam dharma having a dead cam cannot be turned by cam feed, but the cam dharma can be turned by turning the cylinder dharma.
The cylinder dharma has no cam and is difficult to turn using a wire, but it can be turned by applying a wire to the gear. For this purpose, the cam feed prevention mechanism according to claim 2, wherein a dharma cover (13) is provided outside the cylinder dharma so that the operation of the cylinder dharma is disabled by the dharma cover.

  The cylinder dharma (5) and the dharma cover (13) are sandwiched between an outdoor cylinder and an indoor thumb turn when the lock is attached to the door, and are not easily destroyed even with a tool. It is also possible to effectively prevent the breakage of the door and lock that are expected to occur in the future by drilling a hole with a drill or the like and feeding the cam through the hole.

The indentation strength of the dead bolt will be described.
Securing the dead-bolt push-in strength by the lock includes the one that depends only on the dead cam, the one that depends on the dead cam and the locking bar, and the other that depends only on the locking bar.
For these, the angle of the dead cam with respect to the dead bolt at the time of locking is important. In that sense, it is convenient to freely change the rotation angle ratio of both dharmas of the present invention.
2 and 3 ensure the strength with both the dead cam and the locking bar.
If you want to secure only with the locking bar, you can increase the rotation angle of the cam dharma.

Regarding the prevention of cam feed, the drill that is likely to occur in the future is that the cam dharma when locked is fixed and does not rotate, the cylinder dharma is protected by the dharma cover, and the dharma cover is protected by being sandwiched between the cylinder and thumb turn. You can also make a hole in the door and the lock case using, and prevent cam feeding from the hole.
The problem can be solved as described above.

Every lock or switch with a cylinder has a cam to transmit the rotational force of the key. The cam dharma having the dead cam of the mechanism of the present invention is the cam itself.
Therefore, this mechanism can be used to prevent cam feed for any product with a cylinder.
Cam feeding, which has occurred frequently in recent years, is a lock on the entrance of apartments, apartments, and detached houses. First of all, I want to prevent cam feeding of these locks.

Most of the entrance locks used for the opening doors of residences have latch bolts.
However, the operating system of the latch bolt and the dead bolt is completely separated.
For this reason, almost all of these locks can be provided with this mechanism.
The method of attaching and using the lock provided with this mechanism is the same as the conventional lock.

Explain the situation where the door lock with this mechanism was used for cam feeding using a drill in the future.
Drill holes from the outdoor side to the steel plate and lock case on the outdoor side of the door.
Insert a wire of various shapes from the hole and rotate the cam dharma while touching the dead cam.
However, the Kamdaruma is fixed and does not turn.

  If you try to rotate the cylinder dharma, the cylinder dharma is inside the dharma cover and cannot be operated. When trying to break the dharma cover with a drill, the dharma cover is sandwiched between the cylinders and is difficult to break unless the cylinder is destroyed. In addition, the cylinder is a lump of metal, and its outer periphery is protected by a stronger metal, making it difficult to break the cylinder.

It is the perspective view which removed the cylinder of the lock | rock which provided the mechanism of Claim 1 and 2. FIG. The AA cross section of FIG. 1 shows a locked state. Indicates unlocked state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lock case 2 Lock case cover 3 Dead bolt 4 Cylinder assembly hole 5 Cylinder dharma 6 Cylinder bearing hole 7 Cam dharma shaft 8 Cam dharma 9 Dead cam 10 Gear 11 Gear 12 Position where gear teeth do not mesh 13 Dharma cover 14 Gear engagement pusher 15 Gear Catch spring 16 Click spring 17 Locking pin 18 Locking pin spring 19 Locking bar 20 Play

Claims (2)

      It has a dead cam for taking in and out the dead bolt (3) of the lock, and usually one dharma for assembling the cylinder, a cylinder dharma (5) with a cylinder bearing hole (6) for assembling the cylinder, and a cylinder It is divided into a cam dharma (8) with a dead cam (9) that does not have a bearing hole and a cylinder, and a gear (11) is provided at a fixed portion of the outer circumference of the cylinder dharma (5). A lock structure in which a gear (10) is provided in a fixed part and a cylinder dharma (5) and a cam dharma (8) are connected by a gear (11) (10) in a lock case (1). Turn the cylinder dharma (5) in the locking direction, and the cam dharma (8) connected by the gears (11) and (10) turns, and the cam dharma (8) The cam (9) protrudes and locks the dead bolt (3), and in the locked state where the dead bolt has finished being pulled out, the outer periphery of both daruma (5) and (8) is engaged with the gearless position, and the cylinder The portion of the dharma (5) where the gear teeth do not mesh, which corresponds to the radial dimension of the crest portion of the gear teeth, where the gear (11) is not provided, is the cam dharma (8). The cylinder dharma (5) can be rotated by entering the part where the teeth of the gear (10) have been removed, which corresponds to the diameter of the tooth valley, but the cam dharma (8) does not rotate, and the lock case (1) If you insert a wire into the dead cam (9), put the wire on the dead cam (9), move the dead cam and try to retract the dead bolt (3), the cam dharma (8) will not turn, and the lock cannot be unlocked by cam feed. Beam feed prevention mechanism. A dharma cover (13) that protects the cylinder dharma is provided around the cylinder dharma (5) to which the cylinder is assembled. Even if a wire is inserted into the lock case, the dharma cover prevents the wire from touching the cylinder dharma. The cam feed prevention mechanism according to claim 1, wherein the cylinder dharma is also prevented from being illegally operated.