JPH0543171Y2 - - Google Patents

Description

[Detailed description of the invention] A. Field of industrial application This invention relates to a cylinder lock with a replaceable inner cylinder.
In detail, in various fields where locks are used, if the key is lost and the lock needs to be replaced with a lock with a different key code, the inner cylinder can be removed and replaced only when the lock is unlocked using a dedicated key for changing the inner cylinder. This relates to a cylinder lock that can be easily locked.

B. Conventional technology Conventionally, when the key of a cylinder lock is lost, if the lock does not need to be replaced, it is sufficient to simply replenish the spare key, but when the lock needs to be replaced, the following method is used: I found a way.

○ Method of replacing the entire lock.

○ A method in which the locking device is equipped with a customer lock and an administrative lock, and the inner cylinder is removed using the administrative lock. (Jikko 54-
Publication No. 30310. ) ○ How to remove a lock with an integrated inner and outer cylinder from the housing using a replacement master key. (USP,
Specification No. 3713311. ) Problems that the invention aims to solve In recent years, locks used in rental lockers for storing clothes and belongings at golf courses, swimming pools, fitness clubs, etc., as well as in post office boxes, safe deposit boxes, apartment complexes, etc. There were many accidents where keys were lost, and as a countermeasure, it was often necessary to have a spare key on hand.

However, from a security standpoint, the use of spare keys is not recommended, and there is an increasing demand for locks to be replaced when keys are lost.

If a method of replacing the entire locking device was adopted in response to such a request, the work could not be done by an amateur, was uneconomical, and could not be handled quickly.

Also, Publication No. 54-30310, USP3713311
The locking device disclosed in the specification had the disadvantage that the structure was complicated and the price of the entire lock was inevitably high.

The present invention was developed in view of the above-mentioned drawbacks, and is a cylinder lock that has a simple structure, can be mass-produced at low cost, and allows the inner cylinder to be easily removed and replaced only when the lock is in the unlocked state using a special key for changing the inner cylinder. It provides:

D. Means for solving the above problems The means of the present invention adopted to achieve the above object consists of an outer cylinder 2 and an inner cylinder 4 slidably and rotatably inserted into the outer cylinder 2. key 1 in the axial direction of the inner cylinder 4.
In the cylinder lock L having two key slots 4c drilled therein, a slit 13 is bored at the rear end of the inner barrel 4 and communicates perpendicularly with the rear end of the key slot 4c, and an inner barrel replacement key 12A is inserted into the slit 13. An elevating plate 14 that is pressed and pushed up is inserted into the tip of the slit 13, and an engagement groove 15 is cut on the outer periphery of the inner cylinder 4 on the extension of the slit 13, while the inner cylinder 4 of the outer cylinder 2
A slit 16 communicating with the slit 13 is bored in a portion facing the slit 13, and the engagement groove 15 of the inner cylinder 4 is inserted into the slit 16 when the lock is locked.
A stopper 17 is fitted therein, and when the lock is unlocked, the stopper 17 is pushed up by the elevating plate 14 and disengaged from the engagement groove 15 against the spring force.

E. Function If the lock user loses the key or the key is stolen and the lock needs to be replaced, insert the inner cylinder replacement key 12A from the keyhole 6a of the front cover 6 into the key slot 4c of the inner cylinder 4. When the insert is rotated 90 degrees in the unlocking direction from the locked state shown in FIG. 3, the inner cylinder 4 rotates to the state shown in FIG. 2.

At this time, both sides of the tip guide portion 10b of the inner cylinder replacement key 12A are connected to projections 11a and 11 provided on both sides of the lower side of the lifting plate 14 for releasing the stopper.
a is pushed up, and the stopper 17, which is elastically held toward the inner cylinder 4 side by the spring 19 and is engaged with the engagement groove 15 of the inner cylinder 4, is disengaged from the engagement groove 15 of the inner cylinder 4.

As a result, the inner cylinder 4 becomes completely free from the outer cylinder 2, and by pulling the inner cylinder replacement key 12A toward yourself, the inner cylinder 4 can be pulled out as shown in FIG.

Next, insert the keyed inner cylinder 4 with a different key code into the outer cylinder 2.
The inner cylinder 4 is replaced by inserting it into the inner cylinder 4 and turning it over to the locked state to complete the replacement work of the inner cylinder 4.

F. Example Hereinafter, an example of implementing the present invention will be described in detail regarding a pin tumbler type cylinder lock L based on the drawings.

In the drawing, a pin tumbler type cylinder lock L that allows the key to be pulled out in the locked position has an outer cylinder 2 supported and fixed to a support plate 1 of a lock case (not shown), and a cylinder lock L that slides and rotates onto this outer cylinder 2. It consists of an inner cylinder 4 which is movably inserted therein and has a cylinder cam 3 squarely fitted at its rear end.

The outer cylinder 2 of the cylinder lock L has a bulging edge 2a covered with a cover 5 formed on the front side. 1a is a door plate.

On the other hand, a front 4a covering a front cover 6 is formed on the front of the inner cylinder 4 of the cylinder lock L, and a keyhole 6a of the front cover 6 is located in a front room 4b formed on the back side of the front cover 6.
A shutter 7 for closing the door is installed so as to be openable and closable.

Further, a key slot 4c communicating with the keyhole 6a of the front cover 6 is bored in the downward axial direction of the inner cylinder 4, and a plurality of pin holes 4d communicating with the key slot 4c in a perpendicular state are formed in the flat upper surface. Two rows of holes are formed in a staggered manner with a predetermined spacing between the holes and the seat 4e. A cord pin 8 having a cord groove 8a in its upper part is inserted into each pin hole 4d while being constantly urged downward by a cover plate 9 fixed to the seat 4e and a coil spring 10.

On the other hand, bar slots 4f are cut out on both sides of the inner cylinder 4 and communicate with each of the pin holes 4d at right angles, and a side bar 1 is formed in each bar slot 4f.
1 and 11 are loosely fitted.

These side bars 11, 11 are connected to the inner cylinder 4 when locked.
The key 12 is inserted into the key slot 4c of the inner cylinder 4 through the keyhole 6a of the front cover 6, and is engaged with a recess (not shown) in the inner wall of the outer cylinder 2.
When each cord pin 8 is pushed up to a predetermined position using the notched hole 12a, the cord grooves 8a are aligned in a straight line, and the side bars 11, 11 are inserted with their bases back into each cord groove 8a, and at the same time their tips are inserted. is pulled into the bar slot 4f of the inner cylinder 4, and the engagement with the outer cylinder 2 is released.

As a result, the inner cylinder 4 becomes rotatable, and the key 12 is
It is unlocked by rotating it 90 degrees.

The above is a pin tumbler type cylinder lock L
The basic structure of the inner cylinder exchange mechanism, which is the main part of the present invention, will be explained below.

First, a slit 13 with a U-shaped cross section that is parallel to the cord pin 8 and communicates orthogonally with the rear end of the lower key slot 4c is bored in the upper surface of the rear end of the inner cylinder 4, and the inner cylinder is replaced in the slit 13. An elevating plate 14 that is pressed and pushed up by the tip guide portion 10b of the key 12A is fitted. Further, on the outer periphery of the inner cylinder 4 on the extension of the slit 13, an arcuate engagement groove 15 is cut into which a stopper of the outer cylinder 2, which will be described later, engages when the lock is locked.

As shown in FIG. 5, the elevating plate 14 is
Both sides are bent forward at right angles, and the key slot 4
Rounded protrusions 14a, 14a are provided at the lower end so that the elevating plate 14 is smoothly pushed up when pressed by the tip guide portion 10b of the inner cylinder replacement key 12A inserted in c. A circular arc edge 14b having the same shape as the outer periphery of the inner cylinder 4 is formed in a curved manner.

Next, a portion of the outer cylinder 2 that faces the slit 13 (engaging groove 15) of the inner cylinder 4 is provided with the slit 1.
3, a wide slit 16 is bored, and a stopper 17 for preventing the cylinder 4 from being pulled out is fitted into the slit 16 so as to be movable up and down.

Further, an outer cylinder 2 on one side extension of the slit 16 is provided.
As shown in FIGS. 2 and 3, a deformed arc-shaped spring groove 18 is cut on the outer periphery of the stopper 17, and a notched annular spring 19 is installed in the groove 18 as a member that elastically holds the upper surface of the stopper 17 at one end. are fitted.

As shown in FIG. 5, the stopper 17 has arcuate edges 17a, 17a whose upper and lower sides are both the same shape as the inner circumference of the outer cylinder 2 (same shape with the outer circumference of the inner cylinder 4 and the arcuate edge 14b above the lifting plate 14). It is curved and has notches 17b, 17b formed on both sides to be hooked to the upper edges of both ends of the slit 16 of the outer cylinder 2 when the lock is locked.

When the stopper 17 is locked, the stopper 17 is in the third position.
As shown in the figure, the lower arcuate edge 17a is engaged with the engagement groove 15 of the inner cylinder 4, and the notches 1 on both sides are engaged.
7b and 17b are hooked to the upper edges of both ends of the slit 16 of the outer cylinder 2, and are in a positional relationship shifted by 90 degrees from the lifting plate 14 in the slit 13 of the inner cylinder 4.

Therefore, if it becomes necessary to replace the inner cylinder 4 due to the loss of the key 12, etc., insert the inner cylinder replacement key 12A into the key slot 4c and rotate it 90 degrees to return it to the unlocked position, as shown in Fig. 2. The tip guide portion 10b of the key 12A is the protrusion 14a at the lower end of the elevating plate 14,
14a and pushes the elevating plate 14 upward. At this time, since the slit 13 of the inner cylinder 4 and the slit 16 of the outer cylinder 2 are in communication with each other, the stopper 17 is also pushed up as the lifting plate 14 rises.

As a result, the arc edge 17a below the stopper 17
Since the inner cylinder 4 is disengaged from the engagement groove 15 of the inner cylinder 4, the inner cylinder 4 becomes completely free from the outer cylinder 2 and can be pulled out.

By the way, the inner cylinder replacement key 12A is the sixth
As shown in the figure, it is formed into a flat plate shape and has a notched hole 12a similar to the locking/unlocking key 12B (ordinary master key), and the tip guide portion 10b has protrusions 14a on both sides of the lower end of the elevating plate 14, 14a, but the tip guide portion 10b of the original locking/unlocking key 12B (including the master key) of the cylinder lock L comes into contact with the protrusions 14a, 14a, as shown in FIG. The portion is cut out in a trapezoidal or arc shape, making it impossible to push up the elevating plate 14.

However, the shapes of the keys 12A and 12B are not limited to the above-mentioned ones. For example, two types of keys, long and short, are prepared, and the short key is used as the normal key 12B for locking and unlocking, while the long key is used as the key 12B for locking and unlocking. Inner cylinder replacement key 1
It can also be set to 2A.

Although the above embodiments have been described with respect to a pin tumbler type cylinder lock L, the present invention can also be applied to a disk tumbler type cylinder lock.

Effects of the invention As described above, the cylinder lock with a replaceable inner cylinder according to the invention has a key slot 4c at the rear end of the inner cylinder 4.
A slit 13 that communicates perpendicularly with the rear end of the inner cylinder replacement key 12A is bored into the slit 13, and an elevating plate 14 that is pushed up by being pressed by the tip of the inner cylinder replacement key 12A is inserted into the slit 13.
An engaging groove 15 is cut on the outer periphery of the inner cylinder 4 on the extension of the slit 13, while a slit 16 is bored in the outer cylinder 2 to communicate with the slit 13 of the inner cylinder 4.
When the lock is locked, the inner cylinder 4 is elastically engaged with the engagement groove 15 of the inner cylinder 4 to prevent the inner cylinder 4 from being pulled out from the outer cylinder 2, and when the lock is unlocked, it is pushed up by the elevating plate 14 and is engaged with the engagement groove 15 of the inner cylinder 4. It is configured to release the engagement with the mating groove 15 against the spring force and allow the inner cylinder 4 to be pulled out from the outer cylinder 2, and if the key 12 is lost etc., the inner cylinder 4 needs to be replaced. When the key 1 is completely different from the normal locking/unlocking key 12B,
2A into the key slot 4c, rotate it to the unlocking position, and then pull out the inner cylinder 4, so even an amateur can handle it easily and quickly.There are few failures, and the manufacturing cost is low. Since it is impossible to pull out the inner cylinder 4 in the locked position, safety is extremely high.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view of an example of the present invention in an unlocked state, Fig. 2 is an enlarged sectional view taken along the line of Fig. 1, and Fig. 3 is an enlarged sectional view of the locked state. Fig. 4 is a partially cutaway plan view with the inner cylinder 4 and side bar 11 pulled out, Fig. 5 is a perspective view of the main parts of the present invention, and Fig. 6 is the inner cylinder replacement key 1.
2A is a plan view, and FIG. 7 is a plan view of the locking/unlocking key 12B. Main symbols in the figure: L...Cylinder lock, 2...Outer cylinder, 4...Inner cylinder, 4c...Key slot, 12...
... Key, 12A ... Inner cylinder replacement key, 13 ... Slit, 14 ... Lifting plate, 15 ... Engagement groove, 16 ... Slit, 17 ... Stopper, 1
8... Spring groove, 19... Spring.

Claims (1)

[Claims for Utility Model Registration] (1) An outer cylinder 2 and an inner cylinder 4 slidably and rotatably inserted into the outer cylinder 2, and a key slot 4c for a key 12 in the axial direction of the inner cylinder 4. In the cylinder lock L having a slit drilled therein, a slit 13 is bored at the rear end of the inner cylinder 4 and communicates orthogonally with the rear end of the key slot 4c, and the tip of the inner cylinder replacement key 12A is pressed into the slit 13. Lifting plate 14 that is pushed up
and insert the inner cylinder 4 on the extension of the slit 13.
An engagement groove 15 is cut on the outer periphery of the outer cylinder 2, and a slit 16 communicating with the slit 13 is formed in a portion of the outer cylinder 2 facing the slit 13 of the inner cylinder 4.
A hole is formed in the hole, and the engaging groove 1 is pressed into the engaging groove 15 of the inner cylinder 4 when the lock is locked, and is pushed up by the elevating plate 14 when the lock is unlocked.
5 is fitted with a stopper 17 which is released from engagement with the cylinder 5 against spring force. (2) The inner cylinder according to claim (1), wherein the slit 13 of the inner cylinder 4 is formed into a U-shaped cross section, and the lifting plate 14 bent into a U-shape is fitted into the slit 13. Replaceable cylinder lock. (3) The tip of the inner cylinder replacement key 10A is formed into a square shape, and the protrusions 14 on both sides of the lower side of the lifting plate 14
A cylinder lock with an exchangeable inner cylinder according to claim (1), characterized in that the inner cylinder is pushed up by contacting the cylinder locks a and 14a. (4) The upper and lower sides of the stopper 17 are both arcuate edges 17
A, 17a, and notches 17b, 17b are formed on both sides to be hooked to the upper edges of both ends of the stop 16 of the outer cylinder 2 when the cylinder is locked. Tablet. (5) A deformed arc-shaped spring groove 18 is formed on the outer periphery of the rear end of the outer cylinder 2, and a notched annular spring 19 is fitted into the groove 18 to elastically hold the stopper 17. (1) Cylinder lock with replaceable inner cylinder.