JP2000320200A - Keyhole shutter of cylinder lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shutter capable of completely preventing dirt, dust, or small bugs from invading into the inner tube of a cylinder lock. SOLUTION: A shutter storage part 17 is provided recessedly at the rear of a key guide 5, and a shutter 18 extending in the lateral direction of a keyhole 7 and formed of a platy magnetic material having those dimensions sufficient to cover the keyhole 7 opening in the shutter storage part 17 is disposed in the shutter storage part 17. Also, the shutter 18 is guided so as to be rotated about a rotating shaft 21 provided closely to the keyhole 7 and passed through the outside of the keyhole in lateral direction, and the shutter 18 for covering the keyhole 7 located at a close angle position is attracted by a permanent magnet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyhole shutter for a cylinder lock (hereinafter simply referred to as "shutter"), and more particularly to a simple structure that reliably operates to prevent intrusion of dust and dust into the cylinder lock. Regarding shutters that can be prevented.

[0002]

2. Description of the Related Art In all types of cylinder locks, the space inside the inner cylinder communicates with the outer space through a keyhole, so that dust, dust, or small insects enter the inner cylinder through the keyhole. Etc. easily enter.

As is well known, except for the pin tumbler lock, the inner cylinder of the cylinder lock has a number of slots formed along its central axis, and each slot is slidable or rotatable. It is housed and urged in a direction to engage with a key inserted into the keyhole.

[0004]

Since there is only a slight gap between each tumbler and the partition plate for partitioning the slots, dust and dirt, etc., which have entered the inner cylinder after a long period of use have been removed from the tumbler and the partition plate. If the tumbler is accumulated between the keyholes, the movement of the tumbler is hindered by the dust and the like, and an operation failure occurs in which the tumbler normally cannot return to its original position even if the key is removed from the keyhole.

Accordingly, an object of the present invention is to provide a shutter in which a keyhole of a cylinder lock is closed near an entrance thereof so that dust, dust, small insects or the like can be completely prevented from entering the inner cylinder. I have.

[0006]

In order to achieve the above-mentioned object, the present invention is provided at the front end of an inner cylinder of a cylinder lock,
A shutter storage section is recessed behind the key guide that has a keyhole penetrated along the central axis, and inside this shutter storage section,
A shutter made of a plate-shaped magnetic material that extends in the width direction of the keyhole and is large enough to cover the keyhole opening in the shutter storage portion is provided. Closed angle position to guide around the rotation axis penetrating in the width direction and to cover the keyhole from inside,
And a stopper that defines a retracting angle position that does not interfere with the duplicate key inserted into the keyhole, and a permanent magnet is embedded in the joint surface of the stopper that defines the closing angle position with the shutter.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. This embodiment shows a case where the present invention is applied to a lever tumbler lock.

In FIGS. 1 and 2 showing the structure of a conventional lever tumbler lock, reference numeral 1 denotes an outer cylinder, and an inner cylinder generally denoted by reference numeral 2 is rotatably fitted in the outer cylinder 1. ing.

The inner cylinder 2 has a plurality of partition plates 4, 4, a key guide and a tail plug 6 integrally connected to each other by retainers 3, 3 (see FIG. 2), and a keyhole is formed along a central axis. 7
Is penetrating.

Further, between the partition plates 4 or between the partition plates 4
8 formed between the key guide 5 and the tail plug 6
A tumbler 9 having a C-shaped overall shape is rotatably supported at one end on a support shaft 11.
2 (see FIG. 2), and is urged in a direction approaching a duplicate key (not shown) inserted into the keyhole 7.

When the duplicate key is inserted into the keyhole 7 and the lever tumbler 9 is swung by the key groove of the duplicate key, and the unlocking notch 13 formed at the other end is aligned with the locking bar 14, this lever is released. The tumbler lock is released.

In this state, if the inner cylinder is turned via the duplicate key, the locking bar 14 moves in the direction of the center axis of the inner cylinder due to the wedge action generated between the cam groove 15 and the locking bar 14.
The fact that the inner cylinder is rotatable is no different from the conventional lever tumbler lock.

In FIGS. 1 and 2, reference numeral 16 denotes a backup pin. The backup pin 16 functions as a stopper for the lever tumbler 9 when the duplicate key is not inserted into the keyhole 7, and a different key different from the duplicate key. It also has a function of carrying an external force applied to the lever tumbler 9 when inserted into the keyhole.

In the conventional lever tumbler lock having the above-described structure, as is apparent from FIGS. 1 and 2, the inner cylinder space communicates with the outer space through the keyhole 7, so that the inner space of the inner cylinder communicates with the outer space. As described above, dust, dust or small insects enter the inside.

By the way, according to the present invention, the key guide 5 is provided.
In order to prevent dust and dirt from entering the inner cylinder when the duplicate key is not inserted into the keyhole 7.

By the way, when a duplicate key is inserted into the keyhole 7 for locking and unlocking, the duplicate key is closed, so that there is no possibility that dust or dust enters the inner cylinder through the keyhole.

In FIGS. 3 and 4 showing an embodiment of the present invention, reference numeral 5 denotes a key guide.
Because of the incorporation of the shutter inside, the dimension in the center axis direction (the dimension in the left-right direction in FIG. 4) is set to be about 2.8 mm (millimeter) larger (thicker) than the conventional one.

The rear portion (right side in FIG. 4) of the key guide 5 is cut out so that the thickness becomes approximately half, and the shape of the shutter housing portion 17 projected on a plane perpendicular to the rotation axis of the inner cylinder is rectangular.
Are formed.

A shutter 18 shown in FIGS. 5 and 6 is provided in the shutter housing portion 17.

As shown in FIGS. 5 to 7, the shutter 18 extends in the width direction (left and right direction in FIG. 7) of the keyhole 7 opening in the shutter housing portion 17, and covers the keyhole 7. It is made of a plate-shaped magnetic material of a sufficient size.

In the illustrated embodiment, the central portion of the shutter 18 is formed so as to have a trapezoidal cross section. This is because the duplicate key 19 is inserted into the key hole 7 and the shutter 18 does not interfere with the duplicate key. (See Figure 8)
In order not to interfere with the backup pin 16, this configuration is unnecessary when the present invention is applied to a cylinder lock having no backup pin, such as a disk tumbler lock.

The shutter 18 is guided in the shutter housing 17 so as to be rotatable around a rotation shaft 21 (see FIG. 4) which is close to the keyhole and penetrates the outside in the width direction.

For this purpose, as shown in FIG. 6, a support piece 22 is provided at both ends of the shutter 18 so as to protrude. In correspondence with this, as shown in FIGS. A pair of support holes 23 and 3 are formed from the outside of the key guide.

In the illustrated embodiment, the inner end of each support hole 23 extends through the inner wall of the shutter housing 17 into the shutter housing 17.
This is for increasing rigidity by increasing the size in the left-right direction of FIG. 6 (see FIG. 6), and is not an essential configuration of the present invention.

In order to fit the support piece 22 into the support hole 23, for example, one end of the shutter 18 is inserted into one support hole 23 at the positions shown in FIGS. Then, the other support piece 22 is inserted into the other support hole 23 by elastic deformation.

In order to facilitate the elastic deformation of the shutter 18, if necessary, the meat at the center of the shutter 18 is stolen and thinned (not shown).

In this case, the inner peripheral surface of the support hole 23 is
The shutter is supported in the form of circumscribing 2
The function of rotatably guiding the shutter is no different from the usual form of supporting a round shaft and a round hole.

As described above, the shutter 18 is rotatably guided in the shutter housing portion 17, and
Is raised, the keyhole 7 can be covered from the inside as shown in FIG. 4 and FIG.

If the angle position of the shutter 18 is defined as a closing angle position, the closing angle position is
In this case, the bottom of the shutter housing 17 serves as a stopper for defining the closing angle position of the shutter 18.

In the illustrated embodiment, as shown in FIG. 5, since the front surface (outer surface) of the shutter 18 protrudes in a trapezoidal cross section, as shown in FIG. 3 and FIG. Is formed in the central part of the keyhole 7 of FIG.

In order to stably hold the shutter 18 when it is in the closed angle position, the dug portion 24
, For example, a pair of permanent magnets 25, 25 are embedded.

The magnetic poles of the pair of permanent magnets 25, 25 facing the shutter 18 may be mutually different magnetic poles. This is because the magnetic flux density passing through the shutter 18 increases.

The shutter according to the embodiment of the present invention constructed as described above has the shutter 18 in the closed angle position as shown in FIGS. 4 and 7 in a normal state where the duplicate key is not inserted into the keyhole 7. To cover the keyhole 7 from the inside to prevent dust, dust, small insects, etc. from entering the inner cylinder.

This angular position is stably maintained by the attraction between the permanent magnet 25 and the shutter 18 which is a magnetic plate.

When a duplicate key is inserted into the keyhole 7 for locking and unlocking,
The free edge of the shutter 18 is pushed inward by the key, and the magnetic engagement between the shutter 18 and the permanent magnet 25 is released. As a result, the shutter 18 falls down in the direction indicated by the arrow in FIG. Then, the backup pin 16 is engaged with the backup pin 16 so as to surround it.

At this time, as is apparent from FIG.
The shutter 18 is at a retreat angle position that does not interfere with the duplicate key 19, and the backup pin 16 serves as a stopper that defines the retreat angle position of the shutter.

When the locking / unlocking operation is completed and the duplicate key 19 is pulled out from the keyhole, the shutter 18 becomes free again, and returns to the closed angle position shown in FIG.

[0038]

As is apparent from the above description, according to the present invention, the shutter accommodating portion is provided behind the key guide,
A shutter made of a plate-shaped magnetic material extending in the width direction of the keyhole and being large enough to cover the keyhole opening in the shutter storage portion is provided in the shutter storage portion. It is guided so as to be able to rotate around a rotating shaft that penetrates the outside in the width direction in close proximity, and the shutter at the closed angle position that covers the keyhole is attracted by the permanent magnet, so it is not used when unlocking Has the desired effect that the keyhole is always closed to prevent dust and dust from entering the inside of the cylinder lock.

In addition, since the shutter is attracted by the permanent magnet, various effects can be obtained, such as making the entire apparatus compact.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of the structure of a lever tumbler lock.

FIG. 2 is a cross-sectional view taken along line II-II of FIG.

FIG. 3 is a rear view of a key guide incorporating a shutter according to the present invention.

FIG. 4 is a sectional view thereof.

FIG. 5 is a plan view of a shutter.

FIG. 6 is a rear view thereof.

FIG. 7 is a rear view of a key guide incorporating a shutter according to the present invention, showing a state where the shutter is at a closed angle position.

FIG. 8 is a rear view of the key guide incorporating the shutter according to the present invention, showing a state where the shutter is at a retracted angle position.

[Explanation of symbols]

 2 inner cylinder 5 key guide 7 key hole 16 backup pin 17 shutter storage section 18 shutter 19 duplicate key 21 rotating shaft 22 support piece 23 support hole 24 digging section 25 permanent magnet

Claims (1)

[Claims] A shutter housing is provided behind a key guide attached to a front end of an inner cylinder of a cylinder lock and having a key hole penetrated along a central axis, and a width of the key hole is provided in the shutter housing. A shutter made of a plate-shaped magnetic material that is large enough to cover the keyhole that opens in the shutter housing, and penetrates this shutter in the width direction in the vicinity of the keyhole and outside. A stopper that regulates the closing angle position covering the keyhole from the inside and the retracting angle position that does not interfere with the duplicate key inserted into the keyhole is provided, and the closing angle position is set. A keyhole shutter for a cylinder lock, wherein a permanent magnet is buried in a joint surface of a prescribed stopper with a shutter.