JPH07229332A - Inner cylinder change type cylinder lock - Google Patents

Abstract

PURPOSE:To enable the change of an inner cylinder by only providing a slit and a stopper in the inner cylinder, and to reduce the processing cost, parts cost and assembling cost, and to improve the smoothness of key operation by directly cancelling the lock condition of the inner cylinder with an inner cylinder change key, and to prevent the bad influence due to the outside atmosphere. CONSTITUTION:In an inner cylinder change type cylinder lock, which is formed so that an inner cylinder 1 can be drawn from an outer cylinder 3 with the operation of an inner cylinder change key 5 to be inserted into a key hole 1a, a stopper 2 for locking the inner cylinder 1 with the outer cylinder 3 is housed in a slit 1b under the condition that it is always elastically energized outward. The upper end 2a of the stopper 2 is made to always abut on the inner peripheral surface 3a of the outer cylinder 3 by the elastic force of the spring 4. The lower end 2b thereof is formed freely to be engaged with the tip 5a of the key 5. A projection 7, which locks the front surface of the upper end 2a of the stopper 2 at the time of unlocking, is formed on the inner peripheral surface 3a of the outer cylinder 3 along the circumferential direction. A notch part 7a for cancelling this locking condition at the time of opening a lock is formed in the projection 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner cylinder exchangeable cylinder lock, and more specifically, when the key needs to be replaced due to loss of the key or the like, only the inner cylinder is exchanged by using the inner cylinder exchange key. The present invention relates to an inner cylinder exchangeable cylinder lock formed so that it can be formed.

[0002]

2. Description of the Related Art Conventional cylinder locks of this type are disclosed, for example, in JP-A-3-147988 and JP-B-5-43171.
There is one formed as shown in Japanese Patent Publication No. In these conventional examples, a slit is formed at the rear end of the inner cylinder so as to communicate with the keyhole in an orthogonal shape, and an elevating body that is pushed up by the tip of the inner cylinder exchange key is arranged in the slit, and the slit is extended. The engaging groove was formed at the position of the outer peripheral surface of the inner cylinder. A slit is also formed on the outer cylinder so as to communicate with this slit, and the inside of this slit is engaged with the engaging groove when locked and is pushed up by the elevating body when unlocked to lock the inner cylinder. The stopper for releasing the state was elastically housed inward by an annular spring (hereinafter referred to as Conventional Example I).

Conventionally, there is known one formed as shown in, for example, Japanese Utility Model Laid-Open No. 2-99168. In the case of this conventional product, a locking groove is formed on the outer peripheral surface of the rear end of the inner cylinder so as to communicate with the key hole, and a slit communicating with this locking groove is formed in the outer cylinder. A locking plate that is constantly repelled inward is housed, and this locking plate is pushed up by the tip of the inner cylinder exchange key to release the locked state of the inner cylinder (hereinafter referred to as conventional example II. That).

[0004]

In the case of the conventional example I, therefore, slits must be formed not only in the inner cylinder but also in the outer cylinder, and it is necessary to accommodate the lifting body and the stopper in each slit. was there. Therefore, according to this conventional product, there is a disadvantage that the processing cost, the component cost, and the assembling cost are increased, resulting in a high price of the product.

Further, in the prior art example I, the stopper is pushed up by the inner cylinder exchange key because the stopper is pushed up by the tip of the inner cylinder exchange key through the lifting body to release the locked state of the inner cylinder. Was controlled by. Therefore, when using this conventional product, when releasing the locked state of the inner cylinder,
I didn't like the smoothness of key operation.

Further, in the case of the conventional examples I and II, slits for accommodating stoppers and locking plates are formed in the outer cylinder,
There is a disadvantage due to the exposure of these components because the mechanism is such that these components are elastically springed inward and are locked in the engaging grooves on the outer peripheral surface of the inner cylinder. That is, in the conventional product, impurities and water easily enter the cylinder lock through the slit of the outer cylinder, resulting in deterioration of corrosion resistance, chemical resistance, impact resistance, etc. There was a problem.

The present invention is intended to solve the problems of the conventional products. Therefore, the technical problem of the present invention is that the inner cylinder can be replaced by simply providing a slit or a stopper on the inner cylinder to reduce the processing cost, the component cost, and the assembling cost. An object of the present invention is to provide an inner cylinder exchangeable cylinder lock which is configured so that the locked state of the cylinder can be released to improve the smoothness of key operation and is not adversely affected by the external atmosphere.

[0008]

The present invention employs the following technical means in order to solve the above problems. That is, according to the present invention, the inner cylinder 1 having the slits 1b formed in an orthogonal shape communicating with the keyhole 1a, and the outer cylinder 3 into which the inner cylinder 1 is loaded.
In an inner cylinder exchange-type cylinder lock in which the inner cylinder 1 is detachably formed from the outer cylinder 3 by operating the inner cylinder exchange key 5 which is inserted into the key hole 1a, the inner cylinder 1 is removed. Tube 3
The stopper 2 to be locked to the above is always elastically housed outward by the spring 4 in the slit 1b.
The upper end 2a is the inner peripheral surface 3a of the outer cylinder 3 due to the elastic force of the spring 4.
Always comes into contact with the inner cylinder exchange key 5
Is formed so as to be engageable with the front end portion 5a of the outer cylinder 3, and a ridge 7 is formed along the circumferential direction on the inner peripheral surface 3a of the outer cylinder 3 for locking the front surface of the upper end 2a of the stopper 2 at the time of locking. A notch 7a for releasing the locked state is formed on the ridge 7 at times.

In this case, in the present invention, it is preferable that the cutout portion 7a is formed so as to be displaced by a certain angle A from the locking position of the stopper 2 when locking.

Further, according to the present invention, the gap D ₁ between the upper end surface 6a of the spring accommodating portion 6 accommodating the spring 4 and the inner contact surface 2d of the stopper 2 with which the upper exposed end 4a of the spring 4 abuts is locked. However, it is preferable that the tip portion 5a of the inner cylinder exchange key 5 is formed to have the same distance D ₂ as the stopper 2 is pushed down when unlocking.

[0011]

First, the inner cylinder exchange key 5 is inserted into the key hole 1a.
By this insertion operation, the tip portion 5a of the key 5 engages with the lower end 2b of the stopper 2 to push down the stopper 2, and the upper end 2a is separated from the inner peripheral surface 3a of the outer cylinder 3. Then, when the stopper 2 is completely pushed down by the tip portion 5a of the key 5, the engagement state between the front surface of the upper end 2a of the stopper 2 and the ridge 7 is released, and the inner cylinder 1 becomes free. Therefore, in this state, the operator pulls out the inner cylinder 1 together with the key 5 from the outer cylinder 3.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. Reference numeral 1 is an inner cylinder, and 1a is a keyhole formed in the inner cylinder 1 along the axial direction. 1b is the keyhole 1
It is a slit which is communicated with a and is formed at the rear end of the inner cylinder 1 in an orthogonal shape.

Reference numeral 2 is a stopper for locking the inner cylinder 1 to the outer cylinder 3. In this embodiment, the stopper 2 is formed of a plate piece in a substantially inverted U shape, and is housed in the slit 1b in a state where it is always elastically bulged outward by a spring 4. The upper end 2a of the stopper 2 is always in contact with the inner peripheral surface 3a of the outer cylinder 3 by the elastic force of the spring 4. The stopper 2 is provided with a pair of left and right engaging claws 2c (see FIG. 4, etc.) whose lower end 2b engages with the tip 5a of the inner cylinder exchange key 5, and the lower end 2b engages with the tip 5a of the key 5. It is formed freely. As shown in FIG. 1 and the like, the tip portion 5a is narrowed at both ends in this embodiment and is formed narrow.

Reference numeral 6 (see FIG. 4 and the like) is a spring housing portion for housing the spring 4. The spring accommodating portion 6 is formed at the rear end of the inner cylinder 1. D ₁ (see FIG. 4) is a gap between the upper end surface 6a of the spring accommodating portion 6 and the inner contact surface 2d of the stopper 2 with which the upper exposed end 4a of the spring 4 abuts upon locking. This distance D ₁ is a distance D _{2 at} which the tip portion 5a of the inner cylinder exchange key 5 pushes down the stopper 2 when unlocking.
(See FIG. 3) and the same in this embodiment. This is because when the distance D ₁ is shorter than the distance D ₂ , the inner contact surface 2d of the stopper 2 is unlocked and the upper end surface 6 of the spring accommodating portion 6 is opened.
This is because it is impossible to press down by contacting a. Therefore, the distance D ₁ is selected to be equal to or longer than the distance D ₂ .

The inner peripheral surface 3a of the outer cylinder 3 into which the inner cylinder 1 is loaded.
A ridge 7 is formed along the circumferential direction for locking the front surface of the upper end 2a of the stopper 2 at the time of locking. This ridge 7
Has a notch 7a for releasing the locked state at the time of unlocking. The notch 7a is formed so as to be displaced by an angle A from the locking position of the stopper 2 when locking (see the state of FIG. 4). The angle A is 4 in this embodiment.
Selected 5 times. Further, the notch 7a is provided at the lower end 2 of the stopper 2 at the position of the protrusion 7 on the opposite side in this embodiment.
It is formed with a notch 7b with which b is engaged.

In FIG. 1, 8 is a front cover of the inner cylinder 1. Reference numeral 9 is a shutter piece incorporated in the front surface of the inner cylinder 1 so as to open and close the keyhole 1a. The shutter piece 9 is urged downward by a spring 10 so that the keyhole 1a is always present.
Is closed, and is pushed up by inserting a normal key or the inner cylinder exchange key 5. 1c is the inner cylinder 1
Is a tumbler pin, 12 is a tumbler pin spring, and 13 is a lid for closing the pin insertion hole 1c. Also, 14 is a pair of left and right side bars, 15 is a leaf spring that elastically springs the side bars outward, 16 is a joint that is fitted into the rear end of the outer cylinder 3,
Reference numeral 7 is a retaining ring, and 18 is a restriction cam.

Next, the operation of this embodiment will be described. First,
Insert the inner cylinder exchange key 5 into the key hole 1a. Since the tip portion 5a of the key 5 is chamfered, the stopper 2 is gradually pushed down according to the degree of entry of the key 5, and is finally pushed down by the distance D ₂ as shown by the chain line in FIG. Therefore, the upper end 2a of the stopper 2 is separated from the inner peripheral surface 3a of the outer cylinder 3 as shown by the chain line in FIG.

Next, in this state, the user rotates the key 5 clockwise by 45 degrees. As a result, the upper end 2 of the stopper 2
As shown in FIG. 5, a is engaged with the notch 7a of the ridge 7 to release the locked state with the ridge 7, and the lower end 2b is engaged with the notch 7b.

In this case, in this embodiment, since the distance D ₁ and the distance D ₂ are selected to be the same as described above, the inner contact surface 2d of the stopper 2 is the spring accommodating portion 6 of the inner cylinder 1.
Of the inner cylinder 1, the stopper 2, and the key 5 are integrated with each other. Therefore, the user pulls the key 5 in this state and pulls the inner cylinder 1 together with the key 5 out of the outer cylinder 3.

In the above process, in the case of the present invention, the notch 7a may be formed at the position of the ridge 7 with which the stopper 2 is locked at the time of locking, and as in the above example, at the time of locking. Even when the stopper 2 is formed so as to be displaced from the locking position, the angle A is arbitrary.

[0021]

As described above, according to the present invention, the inner cylinder is locked to the outer cylinder only by the stopper housed in the slit of the inner cylinder, and the inner cylinder can be pulled out. . Therefore, in the present invention, since only the above stopper is required, it is possible to reduce the component cost and the assembly cost, and the time and labor to process the slit in the outer cylinder can be omitted. Therefore, it is possible to reduce the product price. Play. Further, in the case of the present invention, the stopper is always springed outward to lock the inner cylinder to the outer cylinder, and the inner cylinder exchange key is used to directly push down the stopper to release the locked state of the inner cylinder. It was done. Therefore, according to the present invention, unlike the conventional product, the stopper in the outer cylinder is not controlled through the elevating body in the inner cylinder, etc. According to this, the stopper can be directly operated by the key, and the key operation is smoothed. There is an advantage that you can. Further, according to the present invention, since it is not necessary to form a slit in the outer cylinder, it is possible to prevent the stopper and the spring from being exposed. Therefore, according to the present invention, the adverse effects caused by the external atmosphere can be eliminated, corrosion resistance, chemical resistance, impact resistance, etc. can be improved, and there is an advantage that the mounting location is not restricted in use.

Further, in the case of forming as described in claim 2, there is an advantage that the locked state of the inner cylinder cannot be released unless the stopper is pushed down by the key and then rotated by a certain angle, so that it is less likely to be mischievous.

Further, when the present invention is formed as described in claim 3, the key, the inner cylinder, and the stopper can be integrated into one body, which has the advantage that the operation of extracting the inner cylinder can be facilitated. .

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a preferred example of a cylinder lock of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the cylinder lock, in which a part of the cylinder lock is cut away.

FIG. 3 is an enlarged sectional view of an essential part for explaining the action of the cylinder lock of the same.

FIG. 4 is an enlarged sectional view of a main part taken along the line IV-IV in FIG.

FIG. 5 is an enlarged sectional view of an essential part for explaining the action of the cylinder lock of the same.

[Explanation of symbols]

 1 Inner Cylinder 1a Keyhole 1b Slit 2 Stopper 2a Upper End 2b Lower End 3 Outer Cylinder 3a Inner Surface 4 Spring 5 Inner Cylinder Replacement Key 5a Tip 7 Protrusion 7a Notch

Claims (3)

[Claims] 1. An inner cylinder exchange key which is equipped with an inner cylinder having a slit formed in an orthogonal shape so as to communicate with the keyhole, and an outer cylinder into which the inner cylinder is loaded. In an inner cylinder exchangeable cylinder lock in which the inner cylinder is detachably formed from the outer cylinder, the stopper that locks the inner cylinder to the outer cylinder is always springed outward in the slit by the spring. The stopper has an upper end constantly contacting the inner peripheral surface of the outer cylinder by the elastic force of the spring, and a lower end formed so as to be engageable with the tip of the inner cylinder exchange key. A protrusion is formed along the circumferential direction on the inner peripheral surface for locking the front surface of the upper end of the stopper when locking, and a notch for releasing this locked state when unlocking is formed on this protrusion. A cylinder lock with a replaceable inner cylinder. 2. The inner cylinder exchangeable cylinder lock according to claim 1, wherein the notch is formed by being displaced by a certain angle from the locking position of the stopper when locking. 3. An upper end surface of a spring accommodating portion for accommodating a spring,
A distance between the exposed upper end of the spring and the inner contact surface of the stopper, which is in contact with the stopper, at the time of locking is formed to be the same as the distance by which the tip of the inner cylinder exchange key pushes down the stopper when unlocked. An inner cylinder exchangeable cylinder lock according to item 1 or 2.