JPH0249318Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a replaceable pin-cylinder lock (hereinafter simply referred to as a cylinder lock), and in particular, allows even so-called amateurs to replace the cylinder extremely easily and in a short time. Regarding the cylinder lock that was made possible.

When guests stay at a hotel, etc., they are handed a key, but it is easy to duplicate this, and at a later date,
There have been many incidents of theft in which guests use duplicated keys to break into their rooms. A similar situation can occur when tenants of a shared housing complex such as an apartment or condominium change places. Hotels know that such thefts can be prevented by frequently replacing lock cylinders, but replacing cylinders is traditionally time-consuming and requires a certain amount of knowledge and experience regarding locks. This is difficult to implement in practice.

[Conventional technology]

In the past, there have been proposals to solve the above-mentioned inconvenience by making it easier to replace the cylinder (for example, Japanese Patent Publication No. 50-2433). This method has the disadvantage that it requires knowledge of the structure.

[Problem that the invention attempts to solve]

Therefore, the purpose of this invention is to use special tools, knowledge,
To provide a cylinder lock which allows even an amateur to replace the cylinder very easily and in a short time without requiring any experience.

[Means for solving problems]

In order to achieve the above object, the present invention includes an inner cylinder in which a keyhole is formed along the central axis to the outer peripheral surface, and a keyhole slit is opened in the outer peripheral surface along the generatrix; tumblers arranged in a row along the central axis, each guided by a pin hole penetrating the fitting surface of the inner cylinder and the outer cylinder, and biased toward the center of the inner cylinder. and a plurality of sets of pins and driver pins, and the joint surfaces of the tumbler pin and driver pin are aligned on the shear line when a duplicate key is inserted into the keyhole, and the outer cylinder is fixed to the door. It is slidably fitted into the inner hole of the cylindrical holding seat, and is inserted into the part of the outer cylinder at an angular position that does not align with the keyhole slit in the locked state, and is attached in the direction of the center axis of the inner cylinder. A biased locking pin is provided so as to be movable in the biasing direction, and a recess is provided in which the inner end head of the locking pin engages in a keyhole slit that is aligned with the locking pin in the generatrix direction of the inner cylinder. On the other hand, a locking hole for receiving the outer end tail of the locking pin and locking the outer cylinder to the holding seat is opened in the inner hole surface of the holding seat that aligns with the locking pin in the locked state, and It has the same key groove shape as the keyhole, but when the inner cylinder is rotated using a replacement duplicate key with a notch in the back of the key that aligns with the recess when inserted into the keyhole, it is removed from the locking hole. It is characterized by the following.

An embodiment of the present invention will be described below with reference to the drawings.

〔Example〕

In Figs. 1 and 2, reference numeral 1 indicates an inner cylinder, and this inner cylinder 1 is a rod-shaped body with a flange formed at its outer end (left end in Fig. 1) to prevent it from coming off. Keyhole 2 extending along the axis to the outer peripheral surface
is formed, and therefore, a keyhole slit (not numbered for clarity of drawing) is opened along the generatrix on the outer peripheral surface of the inner cylinder, similar to a normal pin cylinder lock. be.

The inner cylinder 1 is slidably fitted into, for example, an inner hole of a cylindrical outer cylinder 3, and as shown in FIG.
It is designed so that it does not come off from the outer cylinder 3.

On the other hand, in the fitting portion of the inner cylinder 1 and the outer cylinder 3, there are a plurality of (6 in the illustrated embodiment) along these generatrix lines.
A set of tumbler pins 5 and driver pins 6 are arranged in a row. Each of these pairs of tumbler pins 5 and driver pins 6 penetrates the fitting surface (so-called shear line) between the inner cylinder 1 and the outer cylinder 3, and is guided to a pin hole 7 that interferes with the keyhole 2. It is urged inward by the elasticity of the tumbler spring 8, which is a compression coil spring.

Each of these pairs of tumbler pins 5 and driver pins 6 is inserted into the pin hole 7 according to the cutting depth of the corresponding key groove when the duplicate key IK is inserted into the key hole 2, as shown in FIG. , the joint surfaces of the tumbler pin 5 and the driver pin 6 are all aligned on the shear line, and the inner cylinder 1 can rotate relative to the outer cylinder 3. The configuration described above is similar to that of a normal pin cylinder. Note that the duplicate key here does not refer to a so-called spare key, but refers to a key having a regular keyway shape for unlocking one lock.

However, in a normal pin cylinder,
The outer cylinder 3 is fixed to the door, and the cylinder lock according to the present invention has the outer cylinder inserted into the inner hole of the cylindrical retaining seat 9 fixed to the door D, as shown in FIGS. 1 and 2. 3
is removably fitted.

The holding seat 9 is, for example, a thick-walled cylindrical body having a truncated conical outer shape, and its bottom surface is joined to the outer surface of the door D. As shown in FIG. , and a pair of bolts 12, 12 that pass through the lock box 11, and are fixed to the outer surface of the door D so as to be attached. In the inner hole of this holding seat 9, the inner cylinder 1 and the outer cylinder 3 are provided.
is slidably fitted and, as will be described later, is locked by a locking pin so that it cannot be removed.

On the other hand, as shown in Figures 1 and 2, in the locked state of the cylinder lock shown in these figures,
A guide hole 13 is formed in a portion of the outer tube 3 at an angular position that does not align with the keyhole slit on the outer surface of the inner tube, passing through the outer tube in a direction perpendicular to the central axis.

Inside this guide hole 13, a locking pin 14 whose head at the inner end is formed into a conical shape with a rounded tip, for example.
is housed while being guided so as to be movable in its axial direction. This locking pin 14 has a locking pin spring 15 as a compression coil spring wound around its base.
is urged in the direction toward the central axis of the inner cylinder by the elasticity of the inner cylinder.

On the other hand, the portion of the keyhole slit opened on the outer peripheral surface of the inner cylinder 1 that is aligned with the locking pin 14 in the axial direction of the inner cylinder 1, that is, the inner cylinder 1 is aligned with the locking pin 14
As shown in FIG. 2, for example, a conical recess 16 into which the head of the locking pin 14 engages is provided at a portion that intersects with the inner end of the locking pin 14 when the locking pin 14 rotates relative to the It is formed.

In addition, the inner hole surface of the holding seat 9 that aligns with the guide hole 13 and the locking pin 14 in the locked state has a
A locking hole 17 into which the outer end tail of the locking pin 14 engages is open. This locking hole 17 is inserted into the holding seat 9 by a drill or an end mill (both not shown) that rotates perpendicularly to the drive shaft using a bevel gear, for example.
It can be machined from the inner hole side.

The length of the locking pin 14 in the axial direction is such that when the inner end head is in contact with the outer peripheral surface of the inner cylinder 1 as shown in FIGS. 17, and the depth of the recessed portion 16 (FIG. 2) is such that when the head of the locking pin 14 engages therein, the tail of the locking pin engages. It is set so that it can be pulled out from the stop hole 17.

In addition, in FIGS. 1 and 3, the reference numeral 18
1 shows a plate-shaped cam driving piece 18 integrally projecting from the inner end of the inner cylinder 1, and this cam driving piece 18 loosely fits into the opening on the side of the lock box 11 to open the dead bolt 19.
(Fig. 3) is inserted into a clutch hole 21a of a dead cam 21 for operating the engine (Fig. 3). This detsudo cam 2
1 is connected to a thumb turn (not shown) on the inside of the door, and is rotatably supported by a receiving member 22 fixed to the lock box 11.

[Effect]

In the cylinder lock according to an embodiment of the present invention configured as described above, in the locked state shown in FIGS. 1 and 2, the locking pin 14 and the recess 16 formed on the outer circumferential surface of the inner cylinder are aligned. Therefore, the locking pin 14 is pushed out by the outer circumferential surface of the inner cylinder 1 in the direction of protruding outside the outer cylinder 3 against the elasticity of the locking pin spring 15, and the tail part of the locking pin 14 is pushed out of the locking hole. It is inserted in 17. As a result, the inner cylinder 1 and the outer cylinder 3 are locked to the holding seat 9 via the locking pin 14.

When the duplicate key IK is inserted into the keyhole 2, the joint surfaces of the tumbler pin 5 and driver pin 6 are all aligned on the shear line, as shown in Fig. 4, and the inner cylinder 1
is rotatable relative to the outer cylinder 3 which is locked to the holding seat 9. That is, by turning the duplicate key IK, the inner cylinder 1 and the cam drive piece 18 integrated therewith are rotated, and the dead bolt 1 is moved through the dead cam 21.
9 can be operated. In FIGS. 2 and 3, the inner cylinder 1 is turned counterclockwise to unlock.

During the rotation of the inner cylinder 1 by the duplicate key IK, there is an angular position where the locking pin 14 and the concave portion 16 align; at this time, the back portion of the duplicate key IK ( The side edge of the duplicate key that does not have a keyway engraved on it is protruding, so
The head of the locking pin 14 never engages in the recess 16. Shallow arch-shaped recesses (not shown) remain on both sides of the back of the duplicate key IK in the recess 16, but if the head of the locking pin is rounded as in the illustrated embodiment, the locking pin The tip of the locking pin 14 does not fall into the arcuate recess, and the head of the locking pin 14 smoothly slides on the outer peripheral surface of the inner cylinder 1 over its entire rotation angle. That is, the cylinder lock according to the present invention functions in exactly the same way as the conventional lock.

When replacing the cylinder, as shown in FIG. 5, for example, a rectangular notch 22 is cut in the back of the key, which aligns with the recess 16 (FIG. 2) formed on the keyhole slit when inserted into the keyhole. Use the replacement duplicate key CK that has been created. This replacement duplicate key CK is a separate key from the duplicate key IK for the cylinder, and is usually kept in a safe at the front desk of a hotel, for example, but the keyway shape is the same as that of the duplicate key IK.

Therefore, when the replacement duplicate key CK is inserted into the keyhole 2 of the inner cylinder, the joint surfaces of each tumbler pin 5 with the driver pin 6 are aligned on the shear line, and the inner cylinder 1 becomes rotatable.

In this state, when the replacement key CK is turned counterclockwise, for example, as shown in FIGS. Due to elasticity,
The locking pin 14 moves so that its head falls into the recess 16 on the outer circumferential surface of the inner cylinder, and as a result, the tail of the locking pin 14 fits into the locking hole 17 of the holding seat.
removed from the

The movement of the locking pin 14 can be easily detected by the response, the collision sound of the locking pin 14, or the subsequent rotation of the outer cylinder 3 together with the inner cylinder 1. Therefore, after sensing the movement of the locking pin 14, By pulling the replacement key CK, the inner cylinder 1 and the outer cylinder 3 can be removed from the holding seat 9.

After the cylinders (inner cylinder 1 and outer cylinder 3) have been removed, the holding seat 9 is filled with other cylinders that have been removed from other holding seats in the same way, or a spare cylinder that has been stored in a rocker or the like. Installing. To install the cylinder, perform the reverse operation of removing and removing the cylinder. That is, as shown in FIG. 6, the cylinder is inserted into the inner hole of the holding seat 9 at an angle that aligns the locking pin 14 and the locking hole 17, and the outer cylinder 3 is inserted into the inner hole of the holding seat 9.
Hold the replacement key CK with one hand to prevent it from moving, and then turn the replacement key CK clockwise with the other hand.
Then, due to the wedge action generated between the surface of the concave portion 16 and the head of the locking pin 14, the locking pin 14 is pushed out of the outer cylinder 3 against the elasticity of the locking pin spring 15. When pushed, the outer tail portion of the locking pin 14 engages in the locking hole 17, as shown in FIG. 2, and the cylinder is locked in the holding seat 9.
In the state shown in FIG. 2, each tumbler pin 5 is aligned with the driver pin 6, so the replacement duplicate key CK can be pulled out from the keyhole 2, and the same operation is repeated to replace the cylinder.

[Effect of idea]

As is clear from the above description, the present invention has an outer cylinder slidably fitted into the inner hole of a holding seat fixed to the door, and guided so as to be movable in a direction perpendicular to the central axis of the outer cylinder. At the same time, when locking the lock or rotating the inner cylinder using the duplicate key, the outer end tail of the locking pin is inserted into the locking hole opened in the inner hole surface of the holding seat, and when the inner cylinder is rotated using the duplicate key, the outer peripheral surface of the inner cylinder and the duplicate key are locked. The inner end head of the locking pin is restrained by the back part of the cylinder to lock the cylinder to the holding seat,
On the other hand, on the keyhole slit opened on the outer surface of the inner cylinder,
A recess into which the head of the locking pin engages is formed, and when the inner cylinder is rotated using a replacement duplicate key whose back portion is cut out and aligns with this recess when inserted into the keyhole, the above locking occurs. The head of the pin is engaged in the recessed part by the elasticity of the locking pin spring, and the tail of the locking pin is removed from the locking hole at the same time, so even an amateur can easily and quickly replace the cylinder. It can be carried out.

In addition, just by rotating the inner cylinder by a certain angle using the replacement key, the locking of the outer cylinder to the holding seat will be automatically released, so it is necessary to have knowledge and experience regarding locks, and to use the replacement key. No other special tools are required.

Furthermore, since a replacement key is always required to replace the cylinder, a third party who does not have this key cannot pull out the cylinder. It has various effects, such as extremely high sexiness.

Note that the present invention is not limited to the embodiments described above, and can be implemented with various modifications. For example, a protrusion extending in the generatrix direction is formed on either the outer surface of the outer cylinder or the inner hole of the holding seat, and a groove that engages with the protrusion is formed on the other side, and these protrusions and grooves are engaged. By inserting the outer cylinder into the holding seat while holding the cylinder, the outer cylinder will be prevented from rotating, ensuring that it will be locked to the holding seat. Adjustment of angular position becomes extremely easy.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view (taken along lines in Fig. 2) showing the locked state of a cylinder lock according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along lines shown in Fig. 1, and Fig. 3 is an internal view of the cylinder lock. FIG. 4 is a partially cross-sectional partial side view of the lock box for explaining the connection between the cylinder and the dead cam; FIG. 4 is a cross-sectional view similar to FIG. 1 showing the unlocked state with a duplicate key;
Fig. 5 is a vertical cross-sectional view (taken from the line shown in Fig. 6) showing a state in which the inner cylinder is rotated by a certain angle using a replacement key to replace the cylinder, and Fig. 6 is the same as Fig. 2 in that state. FIG. 3 is a similar cross-sectional view. 1...Inner tube, 2...Keyhole, 3...Outer tube, 5...
Tumbler pin, 6... Driver pin, 7...
Pin hole, 8...Tumbler spring, 9...Retaining seat,
13... Guide hole, 14... Locking pin, 15... Locking pin spring, 16... Recessed portion, 17... Locking hole,
22...notch, CK...replacement duplicate key, IK...duplicate key.

Claims (1)

[Claims for Utility Model Registration] A keyhole is formed along the central axis to the outer peripheral surface,
An inner cylinder with a keyhole slit opening along the generatrix line on its outer circumferential surface, and an outer cylinder with this inner cylinder fitted into the inner hole are arranged in a row along the central axis, and the inner cylinder and the outer cylinder are fitted together. While being guided by a pin hole penetrating the surface,
It has a plurality of pairs of tumbler pins and driver pins that are biased toward the center of the inner cylinder, so that when a duplicate key is inserted into the keyhole, the joint surfaces of the tumbler pins and driver pins are aligned on the shear line. The above-mentioned outer cylinder is slidably fitted into the inner hole of a cylindrical holding seat fixed to the door, and this A locking pin that passes through the inner cylinder and is biased in the direction of the center axis of the inner cylinder is provided so as to be movable in the biasing direction, and a locking pin is provided in a portion of the keyhole slit that is aligned with the locking pin in the generatrix direction of the inner cylinder. A concave portion is formed into which the inner end head of the pin engages, and on the other hand, the outer end tail of the locking pin is received in the holding seat inner hole surface that aligns with the locking pin in the locked state, and the outer cylinder is placed in the holding seat. The locking hole to be locked is opened, and the inner cylinder is rotated using a replacement duplicate key that has the same key groove shape as the duplicate key, but has a notch in the back of the key that aligns with the recess when inserted into the keyhole. A replaceable pin cylinder lock characterized in that the head of the locking pin engages in a recessed part and the tail part of the locking pin is removed from a locking hole when the lock is moved.