JPS626070B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a door lock, and is particularly applicable to doors of guest rooms in hotels and the like.

Conventionally, the doors of guest rooms in hotels, etc. have a fixed or free-swivel knob on the hallway side, as shown in Figure 1.
The hotel has several lock holes, and each lock hole uses a guest key, a hotel maid key, and an emerger key. The guest key and the maid key unlock the latch which is automatically locked, and the emerger key unlocks the latch and dead bolt.On the other hand, from the indoor side, the knob (not shown) on the indoor side is turned. The latch can be unlocked using the latches, and the dead bolt can be moved forward or backward using a thumb turn (not shown). However, since one lock hole, or one cylinder, is shared by the guest and the hotel, the cylinder must be replaced if the guest key is lost, stolen, duplicated, etc. In some cases, the key at the hotel must also be changed. Nevertheless, the maid key is generally a common master key for each floor, and the emergent key is a common key for the entire building, so it may be inconvenient to replace the cylinders in only some club rooms.

Moreover, even though the guest key operates only the latch, it shares the same lock hole as the operating mechanism of the dead bolt, so the latch's operating mechanism tends to be complicated, making it difficult to turn the key. It has its drawbacks.

The present invention solves the above-mentioned drawbacks, and allows only the cylinder for the guest key to be replaced without changing the hotel's commercial key.In addition, the rotation operation of the guest key is easy, and the locking operation is improved. The purpose is to improve the

To explain the embodiment, 1 is a door, 2 is a latch, and 3 is a dead bolt. An outer knob 4 is fixed on the outside of the door 1, and a key hole 5 for a guest is provided in the outer knob 4. On the other hand, a keyhole 6 for business use is provided in another location. The guest key hole 5 is used exclusively for the guest key, and is used to unlock the latch 2. The commercial key hole 6 is for commercial keys such as made keys and emmer keys, and the made key has latch 2.
The emergency key can unlock the latch 2 and dead bolt 3. Guests will only be given a guest key. 7 is a cover for the keyhole 6 for business use.
Reference numeral 54 denotes a display device that allows the guest to see from the outside if the dead bolt 3 is locked from inside the room. Reference numeral 8 denotes a lock box, and the advancing and retracting mechanism for the latch 2 and dead bolt 3 is housed in the lock box 8, and is buried within the wall thickness of the door 1 except for the front plate 8a through which the latch 2 and dead bolt 3 advance. . 9 is a cylinder for the guest key built into the outer knob 4,
When the guest key is inserted into the cylinder 9 and rotated in either direction, the square shaft 10 rotates and the first latch hub 11 rotates, so that the engagement piece 11a of the first latch hub 11 engages with the tail piece. 19 to spring 2
0 and the latch 2 retreats into the lock box 8. It is also possible to engage the engaging piece 11a of the first latch hub 11 directly with the core rod 12 of the latch 2 as shown in FIG. In this case, the latch 2 is directly retracted via the core rod 12 against the latch spring 13. 14 is a fixed wall. Further, 15 is a guide. On the other hand, when the inner knob 16 on the inside of the door 1 is rotated, the square shaft 17 is rotated, and the second latch hub 18 is rotated in either direction, so that the engagement piece 11a of the second latch hub 18 is tail piece 1
9 is retracted against the spring 20, so that said core rod 12, which engages the tailpiece 19, is retracted and the latch 2 is retracted into the lock box 8. The latch 2 can be retracted by rotating the guest key in any direction, and the second latch hub 1 connected to the knob 16 on the indoor side
Since the first latch hub 11 is provided separately from the latch hub 8, the spring 20 of the tail piece 19 can be weakened, and therefore the operation of the guest key becomes easier.
On the other hand, the rotation operation of the knob 16 on the indoor side is performed by the spring 20.
In addition, a dedicated spring (not shown) can be used to add weight and ensure reliable operation. Furthermore, when the first latch hub 11 is configured as shown in FIG. 4, the first latch hub 11 directly engages the core rod 12 of the latch 2 and moves it backward, so that the operation can be performed with a force that overcomes only the latch spring 13. Good and easy to operate.

21 is a cylinder for a made key and an emerging key, that is, a commercial key. This cylinder 2
1 is a cam piece 22 that rotates when the made key or emmer key is inserted and rotated.
The range of rotation is different between the made key and the emergent key. 23 is a dead hub, and the dead hub 23 has a bifurcated passive portion 23 that receives the movement of the cam piece 22.
leg part 2 for connecting a and a link member 24 to be described later.
3b and a spring mounting portion 23c for connecting a spring member 25, which will be described later, and a pivot shaft 23d for pivotally fixing the dead hub 23 to the lock box 8 are integrally formed. Further, an operation plate 26 and a link lever 27, which will be described later, are pivotally attached to this pivot 23d, and a thumb turn (not shown) from the indoor side and a shaft of the display device 54 are fitted into the square hole of the pivot 23d. be done. Note that the link member 24 is located between the dead bolt 3 and the dead hub leg portion 23b,
The link member 2 is connected to these so as to be rotatable in an arc, and the link member 2 is connected to the cam hole 3a of the dead bolt 3.
No. 4 engagement pin 24a is fitted. The rear end of the dead bolt 3 is formed into two forks so that the link member 24 can enter therebetween, and a pin 32 that engages with an elongated hole 31 provided in the lock box 8 is attached to one of the two to allow the dead bolt to move forward and backward. I'm going as a guide.

The operation plate 26 includes a driven pin 26a that receives the movement of the cam piece 22, a bent piece 26b bent to engage the link lever 27, and a bent piece 26b bent to engage the dead hub 23. 26
c is provided. Moreover, the dead hub 23
A link lever 27 is rotatably attached to a pivot shaft 23d, and its tip 27a engages with the core rod 12 of the latch 2. The head 25a of the spring member 25 is connected to the spring attachment portion 2 of the dead hub 23.
3c, the spring shaft 25b is inserted through a hole in a rotatable column 33, and the spring 25c is provided between the column 33 and the head 25a.
Note that 34 is a stopper for regulating the amount of retraction of the latch 2. The amount of movement of the latch 2 is regulated by the fixed wall 14. Fig. 3 shows the locked state in which the dead bolt 3 and latch 2 are advanced, but to show the unlocking operation from this state, when the emmer key is inserted into the cylinder 21 and rotated clockwise, the cam The piece 22 rotates clockwise and engages with the bifurcated driven portion 23a of the dead hub 23, thereby causing the dead hub 2 to rotate.
3 in a counterclockwise direction until the engagement is released. This causes the dead bolt 3 to retreat into the lock box 8 via the link member 24. On the other hand, the operation plate 2
6, when the dead hub 23 rotates counterclockwise, its bent piece 26c engages with the dead hub 23 and rotates together. And dead bolt 3 is lockbox 8
When the inward retraction is completed, the driven pin 26a of the operation plate 26 is in a position where it can engage with the cam piece 22. Then, when the emmer key is further rotated clockwise, the cam piece 22 rotates once clockwise.
This time, it engages with the driven pin 26a of the operation plate 26. Then, when the cam piece 22 is further rotated clockwise, the operation plate 26 is also rotated counterclockwise,
At this time, the other bent piece 26b of the operation plate 26 engages with the link bar 27 and rotates it counterclockwise. As a result, the core rod 12 is retracted, and the latch 2 is retracted into the lock box 8 against the latch spring 13. In the case of locking, the opposite is true. When a made key is used, the rotation range of the cam piece 22 is limited to the range that moves the driven pin 26a of the operation plate 26, and only the latch 2 can be unlocked.

As already mentioned, the cylinder 21 is for commercial use only, and various locks suitable for commercial use can be employed. On the other hand, the cylinder 9 inside the outer knob 4 is for guest use, and the entire cylinder 9 may be replaced in case of loss, theft, or duplication of the key, but the cylinder 9 allows the key to be replaced, that is, the unlocking conditions can be changed It is convenient to do so. The cylinder whose unlocking conditions can be changed may be of a conventionally known type, but the cylinder locks shown in FIGS. 5 and after are new examples of cylinder locks whose unlocking conditions can be changed.

In FIGS. 5 to 11, 35 is a cylinder body, and 36 is a cylinder plug. The cylinder plug 36 is rotatable relative to the cylinder body 35 along a sliding line A. 37 is a keyhole. Reference numeral 38 denotes a body pocket provided in the cylinder body 35, and each body pocket 38 is formed to be shifted in the key entry direction. Reference numeral 39 designates plug pockets formed in the cylinder plug 36 in correspondence with the respective trunk pockets 38. This plug pocket 39 and the body pocket 38 are adapted to correspond to each other at a fixed rotational position. An upper pin 40 and a lower pin 4 are attached to each trunk or plug pocket 38, 39.
1 is accommodated, and a change pin 42 is interposed between the upper pin 40 and the lower pin 41 at an appropriate location. The upper pin 40 is appropriately biased and held by a spring 43 from the ceiling of the trunk pocket 38. On the other hand, the lower pin 41 is slidably fitted into the plug pocket 39, and has a fitting recess 41b formed in the upper end surface 41a. The chain pin 4
2 is shown enlarged in FIG. 11, and the cylindrical body 42
1 and a working pin 422 that fits into the cylinder 421. The working pin 422 is made of a ferromagnetic material such as iron, and is adapted to be attracted to a magnet.
The working pin 422 consists of a shaft portion 422a and a head portion 422b, and the head portion 422b is tapered into a truncated cone shape. On the other hand, the cylindrical body 421 has a hole 421 through which the shaft portion 422a of the working pin 422 is inserted.
a, and a housing recess 421b in which the head 422b of the working pin 422 is seated. When the working pin 422 is seated on the cylindrical body 421, the top surface of the head 422b of the working pin 422 and the top surface of the cylindrical body 421 form the same plane, and the working pin 422
A shaft portion 422a of the cylindrical body 421 partially protrudes downward. This protruding shaft portion 422a serves to fit the lower pin 41 into the fitting recess 41b. Therefore, when the chain pin 42 is applied, the lower pin 41 and the chain pin 4 are always connected.
2 are engaged and connected to each other. Each of these pins 39, 40, 41 overlaps each other in the pockets 38, 39, and there is a boundary line B between the upper pin 40 and the lower pin 41, a boundary line C between the upper pin 40 and the chain pin 42, and a boundary line between the chain pin 42 and the chain pin 42. Lower pin 41
A boundary line D is formed by these lines. In this case, the boundary line D between the change pin 42 and the lower pin 41 is always recessed toward the lower pin 41 side. 50 is a key spindle pusher,
51 is a key spindle. The rotation of the key spindle 51 causes the square shaft 10 fitted therein and the first latch hub 11 to rotate. 511 is the cylinder plug 36 of the key spindle 51
The fitting protrusion 361 provided on the cylinder plug 36 and the biasing force of the spindle spring 52 are used to constantly fit the cylinder plug 36 into the fitting groove. When the key spindle pusher 50 moves forward by inserting a replacement key, which will be described later, the key spindle 51 moves forward against the spring 52, and this fitting is released. 53 is fixed to the cylinder plug 36 with a sill shear. Now, if the first guest key 44 is inserted into the key hole 37 as shown in FIG. When the cylinder plug 36 is pressed and moved and the boundary line B or boundary line C coincides with the sliding line A, the cylinder plug 36 becomes rotatable relative to the cylinder body 35.

At this time, the first guest key 44 does not push the key spindle pusher 50 against the spindle spring 52, so the cylinder plug 3
As the key spindle 6 rotates, the key spindle 51 that engages with it also rotates, and accordingly, the square shaft 10 and the first latch hub 11 also rotate. This causes latch 2 to retreat. At this time, since the amount of retraction of the latch 2 is regulated by the stopper 34, the rotatable angle of the cylinder plug 36 is also limited, and it cannot be rotated to the lock replacement position, ie, the auxiliary pocket 45 position, which will be described later. On the other hand, the cylinder body 35 has, in addition to a body pocket 38, a body pocket 38 that extends 90 degrees around the axis of the cylinder body 35.
An auxiliary pocket 45 is provided at the rotated position. This auxiliary pocket 45 is similar to the torso pocket 38.
may be provided corresponding to all of the above, but it is not necessary to do so. Further, the angle may not be 90 degrees. In the auxiliary pocket 45, at least an auxiliary upper pin 46 is held by a spring 47. This auxiliary upper pin 46, shown enlarged in FIG. 10, consists of a magnet 461 and a main body 462 that accommodates the magnet 461. Mortar-shaped tapered surface 462 corresponding to the taper of 422b
b. The magnet 461 is the main body 462
It is housed and fixed at a location somewhat recessed from the main body 462, and a portion of the head 422b of the working pin 422 is pulled into the main body 462 when the working pin 422 is attracted. Like this, cylinder body 3
5 has an auxiliary pocket 45 for the torso pocket 38.
are formed as a pair, so that the plug pocket 39 can correspond and communicate with the body pocket 38, and can also correspond and communicate with the auxiliary pocket 45 forming the pair. The change pin 43 is either placed on the side of the plug pocket 39 or retained within the auxiliary pocket 45.

Next, to explain lock replacement, I-
Each operation state in the I section is shown in FIGS. 7 to 10. Now, as shown in FIG. 7, when the replacement key 49 is inserted into the key hole 37 instead of the first guest key 44, the replacement The upper guide surface 49a of the key 49 pushes up the lower pin 41 so that the lower pin 41 and the upper pin 40
The lower guide surface 49b of the replacement key 49 pushes down the lower pin 41, and the change pin 4 fits into the lower pin 41.
2 and the upper pin 40 are aligned with the sliding line A. In this state, as shown in FIG. 6, the conditions at other positions are also satisfied, and the cylinder plug 36 becomes rotatable. At this time, the tip of the replacement key 49 pushes the key spindle pusher 50, which pushes the key spindle 51 against the spindle spring 52, and as a result, the key spindle 51 and the cylinder plug 36 disengage. The state will be as follows.
Therefore, the cylinder plug 36 can rotate freely, and when the replacement key 49 is rotated 90 degrees, the cylinder plug 36 also rotates 90 degrees, so that the plug pockets 39, 39 can be replaced with the left and right auxiliary pockets 45, 45 in the drawing. It will correspond to FIG. 8 shows such a state, in which the change pin 42 rotated together with the cylinder plug 36 and the working pin 422 is attached to the magnet 46 in the auxiliary pocket 45 on the left side of the drawing.
1 is adsorbed. Therefore, the head 422b of the working pin 422 partially enters the main body 462 of the auxiliary upper pin 46, and the shaft portion 422a of the working pin 422 escapes from the fitting recess 41b of the lower pin 41, releasing the connection. do. Next, in this state, if the replacement key 49 is removed and a second guest key 48, which is an arbitrary matching key, is inserted, the result will be as shown in FIG. That is,
The second guest key 48 has a dimension from the center of rotation to the upper guide surface 48a that is shorter than the first guest key 44 or the upper guide surfaces 44a, 49a of the replacement key 49 by the dimension of the cylindrical body 421 of the change pin 42. Also, the dimension to the lower guide surface 48b of the second guest key 48 is longer than the dimension to the lower guide surfaces 44b, 49b of the first guest key 44 or replacement key 49 by the dimension of the cylinder body 421. Therefore, as shown in the figure, the change pin 42 is pushed into the left side auxiliary pocket 45 in a state in which it is disengaged from the lower pin 41, and the change pin 42 and the lower pin 4 are aligned in a straight line.
1 coincides with the sliding line A. or,
In the auxiliary pocket 45 on the right side of the figure, the change pin 42 is pushed out from the auxiliary pocket 45 and the head 42 of the working pin 422 is attracted to the magnet 461.
Only a portion of 2b enters the main body 462.
If the second guest key 48 is further turned back by 90 degrees from this state, the result will be as shown in FIG. In this state, the fitting protrusion 361 of the cylinder plug 36 fits into the fitting groove 511 of the key spindle 51 again. As is clear from FIGS. 10 and 7, the change pin 8 has been changed in position in the corresponding plug pocket 39 and auxiliary pocket 45, respectively. In other words, the unlocking conditions have been changed. Even if the second guest key 48 is removed from the state shown in FIG. 10 and the first guest key 44 is inserted, it cannot be rotated because the sliding line A does not match the boundary lines D and B.

Note that the replacement key 49 can be further rotated from the state shown in FIG. 8, and the second guest key 48 can be further rotated from the state shown in FIG. 9 to the state shown in FIG. Regarding this, Fig. 11 is an enlarged view of the auxiliary pocket 45 on the right side of Fig. 9.
To explain with a diagram, the working pin 422 is in the sliding line A.
Although it can be said that it is inherently impossible to rotate because it penetrates closer to the auxiliary upper pin 46 side, the head 422b of the working pin 422 that enters from the sliding line A is made into a truncated conical tapered surface, and the auxiliary upper pin 46 body 4
Since the open end of the pin 62 is made into a mortar-shaped tapered surface 462b, when a rotational force is applied to the cylinder plug 36 from the outside, the head 42 of the working pin 422
2b is guided by contacting the tapered surface 462b, and the action pin 422 overcomes the attraction force of the magnet 461 and slips off due to the component force in the direction of the tapered surface 462b generated by the rotational force acting in the direction of the sliding line A. This is because it will be done. Furthermore, the reason why the upper end surface 41a of the lower pin 41 is made concave as the fitting recess 41b is that when the change pin 42 is moved from the plug pocket 39 to the auxiliary pocket 45, when the lower pin 41 is pushed up, the upper end surface 41a of the lower pin 41 is recessed. End face 41
This is because a must match the sliding line A and the lower pin 41 and change pin 42 must be disengaged from each other. Generally speaking, it will not work well if the relationship between the protrusions and recesses between the lower pin 41 and the change pin 42 is reversed.

12 to 16 show another embodiment, in which the upper pin 40 and lower pin 41 are the same, but the change pin 42 and the auxiliary pocket 45 and auxiliary upper pin 46 are different. Others are the same. The change pin 42 has a small diameter protrusion 423 that fits into the fitting recess 41b of the lower pin 41, a large diameter part 424 whose sliding movement is guided by the inner wall of the plug pocket 39, and the large diameter part 424 and the small diameter protrusion 423. and a tapered portion 425 continuously formed between the two ends. The auxiliary pocket 45 is formed into a stepped hole. That is, the auxiliary pocket 45 has a hole 451 having the same diameter as the plug pocket 39 from the sliding line A to a point slightly recessed, and an enlarged stepped portion 452 is formed therein.
The inner part thereof is an enlarged hole 453. Further, the auxiliary upper pin 46 is formed as a stepped pin having a protrusion 463, and no magnet 461 or the like is used. The protrusion 463 of the auxiliary upper pin 46 has a diameter large enough to be inserted into the hole 451, and a length that matches the length of the hole 451 of the auxiliary pocket 45.

Next, to explain lock replacement, FIG. 12 shows a state in which a replacement key 49 is inserted into the key hole 37 instead of the first guest key 44, and the upper guide surface 49a of the replacement key 49 is inserted into the lower pin 41. The change pin 42 and the upper pin 40 are pushed up and fitted into the lower pin 41.
The lower guide surface 49b of the replacement key 49 pushes down the lower pin 41 to align the boundary line C between the lower pin 41 and the upper pin 40 with the sliding line A.
Match the sliding line A. In this state, when the replacement key 49 is rotated 90 degrees to the right, only the cylinder plug 36 rotates, as shown in FIG. 13. The same applies to the previous embodiment, but when the cylinder plug 36 rotates and the plug pocket 39 corresponds to the auxiliary pocket 45, the auxiliary upper pin 46, the change pin 42, and the lower pin 41 always overlap. It will exist. Although it is possible to further rotate the replacement key 49 from the state shown in FIG.
This will be further discussed in the explanation of FIG. If the replacement key 49 is removed in the state shown in FIG. 13 and the second guest key 48 is inserted, the result will be as shown in FIG. 14. That is, the upper guide surface 48a of the second guest key 48 pushes up the lower pin 41,
Insert the change pin 42 into the auxiliary pocket 45 on the right side of the drawing.
While pushing it in, the upper end surface 41a of the lower pin 41 is aligned with the sliding line A. On the other hand, the amount by which the lower pin 41 is pushed up by the lower guide surface 48b of the second guest key 48 decreases, and the auxiliary pocket 45 on the left side of the drawing
The chain pin 42 is pushed out, and the boundary line C between the chain pin 42 and the auxiliary upper pin 46 coincides with the sliding line A. If the second guest key 48 is further turned back 90 degrees from the state shown in FIG. 14, the state shown in FIG. 15 will be obtained. As is clear from FIGS. 15 and 12, the change pins 42 have been changed in position in the corresponding plug pockets 39 and auxiliary pockets 45, respectively. In other words, the unlocking conditions have been changed. In this state, even if the first key 44 is inserted, it cannot be rotated. FIG. 16 is an enlarged view of the auxiliary pocket 45 on the right side of FIG.
The same is true for the auxiliary pocket 45 on the left side of FIG. 13, and the cylinder plug 36 can be further rotated from these states by the tapered portion 425 formed on the change pin 42 and the enlarged step formed on the auxiliary pocket 451. According to section 452. That is, in the state shown in FIG.
6, when a rotational force is applied in the direction of the sliding line A, the tapered portion 425 of the change pin 42 comes into contact with the corner 454 of the enlarged step portion 452, and as a result, a component of the rotational force acts in the taper direction, and the change pin 42 42 slides up, and the fitting recess 41b of the lower pin 41
The engagement of the small-diameter protrusion 423 of the change pin 42 is then released. And as a result, the lower pin 41
Only its upper end surface 41a coincides with the sliding line A, making it possible to rotate. In this case, if the concavity and convexity of the lower pin 41 and the change pin 42 are reversed, rotation is not possible even if the lower pin 41 and the change pin 42 are disengaged.

The above two replaceable cylinder locks have in common that an auxiliary pocket 45 is provided in the cylinder body 35 to allow the change pin 42 to be reversibly replaced, and the change pin 42 can be replaced by turning the cylinder plug 36. Auxiliary pocket 45
side, that is, in the case of the example, the key must be rotated 90 degrees from the vertical position in a horizontal position, the key must be replaced in this horizontal position, and all matching keys can be used in the horizontal position. Something. However, if a new key, for example, the second guest key 48, is inserted in the horizontal position and returned to the vertical position, only the key returned to the vertical position, that is, the second guest key 48, can be used in this vertical position. Something. The number of unlocking conditions is the number of auxiliary pockets 45.
If there are 2 ⁿ pieces, the number can be changed reversibly. Therefore, if auxiliary pockets 45 are provided corresponding to all the body pockets 38, the number of body pockets 38 can be reduced to l.
In total, there are 2 ^l reversible unlocking conditions. For example, if 46 body pockets are formed on the upper and lower sides as shown in Figure 1, the total number of body pockets will be 2 ¹² and 1
This means that there are 4096 unlocking conditions for 5 locks. Furthermore, with such a lock, for example, by changing the length of the chain pin 42, the length of the lower pin, and the length of the upper pin, it is possible to lock other 4096 locks.
A large number of groups having the number of unlocking conditions can be configured. Furthermore, in the case of the embodiment, the lower pin 41
The fitting between the lower pin 41 and the chain pin 42 is such that the lower pin 41 is concave and the chain pin 42 is convex.

As in the above embodiment, if the unlocking conditions of the guest key cylinder can be changed without replacing the cylinder itself, the lock can be quickly replaced in case the guest key is lost, stolen, or duplicated. Prevention and countermeasures against illegal trespassing etc. can be carried out quickly and reliably. Furthermore, if the cylinder shown in the above embodiment is used as a cylinder that can change the unlocking condition, a change pin can be added and the change pin can be exchanged between the auxiliary pocket and the plug pocket, so the mechanism for changing the unlocking condition is extremely simple. It can be configured as follows. Since the chendipine can be reversibly replaced, the unlocking conditions can also be changed reversibly. The unlocking conditions can be changed to arbitrary conditions since all the locking keys can be inserted at the position communicating with the auxiliary pocket. Furthermore, to change the unlocking conditions, use the replacement key to rotate the cylinder plug to the auxiliary pocket position, remove the replacement key at that position, insert the new key of your choice, and return it to the original position to set the new specific unlocking conditions. Since the process is complete, the guest key lock replacement operation is very easy. The number of unlocking conditions can be 2l (-: number of pockets), and together with the above-mentioned change to the arbitrary unlocking condition, it is possible to reliably prevent keys from being copied.

As described above, the present invention is a door lock equipped with a latch and a dead bolt, in which a cylinder for a guest key and a cylinder for a business key are provided separately, and the guest key is linked so that only the latch can be unlocked. Since the key is connected to the latch and dead bolt so that it can be unlocked, it is easy to change or replace the cylinder in case the guest key is lost, and the turning operation of the guest key is easier.
Furthermore, it is highly effective in crime prevention.

In other words, the cylinder for the guest key and the cylinder for the business key are provided separately, so if you lose the guest key, you can convert only the cylinder for the guest key, and replace the cylinder for the business key. There is no need to convert.

This allows you to deal with loss, theft, duplication, etc. of the guest key, even if you change the guest key unlocking conditions or replace the guest key cylinder itself.
The hotel's business key can be used without changing, but there is an inconvenience that the business key cannot be used for only some rooms, or if you are forced to change the keys for all rooms because the keys for some rooms are replaced. There will be no more problems.

Moreover, the guest key is linked so that it can only unlock the latch, and the business key is linked so that it can unlock the latch and dead bolt, so even if you replace the guest key cylinder, the business key will remain the same as before. The same one can be used. Furthermore, the guest key is linked so that only the latch can be unlocked.
The guest key can be rotated easily.

In addition, in the past, a guest key was duplicated and taken home, and later when there were no guests staying at the hotel, the duplicated guest key was used to infiltrate and take away the equipment in the room, causing damage, but the present invention Only the latch can be unlocked, and the dead bolt cannot be unlocked, so if you lock it with a business key after the guest leaves, there is no risk of theft even if the guest key is copied. This, together with the fact that the guest key cylinder can be easily changed or replaced, is highly effective in terms of crime prevention.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional example, FIG. 2 is a perspective view showing the appearance of a door lock showing an embodiment of the present invention, FIG. 3 is a perspective view showing the structure of the embodiment, and FIG. Figures 5 and 6 are perspective views showing other examples of latch hubs, and Figures 5 and 6 are longitudinal sectional views of the cylinder for the guest key used in the example, and Figure 5 shows the state in which the first guest key is inserted. 6 shows a state in which a replacement key has been inserted. Figures 7 to 10 are I- of Figure 5.
In the I cross-sectional view, from the state where the replacement key is inserted,
This shows the operation from turning the guest key to completing changing the unlocking conditions. FIG. 11 is a partially enlarged view of FIG. 9, and FIGS. 12 to 16 are cross-sectional views showing other examples of the guest key cylinder used in the embodiment. 1...Door, 2...Latch, 3...Dead bolt, 5...Key hole for guest, 6...Key hole for commercial use, 9...Cylinder for guest key, 21...
Commercial cylinder, 35... Cylinder body, 3
6...Cylinder plug, 38...Body pocket,
39...Plug pocket, 40...Top pin, 41
...Lower pin, 42...Change pin, 44...First guest key, 45...Auxiliary pocket, 46...
...Auxiliary upper pin, 48...Second guest key, 49
... Replacement key, 50 ... Key spindle pusher, 51 ... Key spindle, 421 ... Cylindrical body, 422 ... Working pin, 423 ... Small diameter protrusion, 4
25...Tapered part, 452...Enlarged step part, 46
1...Magnet, A...Sliding line, B, C,
D... Boundary line.

Claims (1)

[Claims] 1. In a door lock equipped with a latch and a dead bolt, a cylinder for a guest key and a cylinder for a commercial key are provided separately, and the guest key is linked so that only the latch can be unlocked. A door lock characterized in that the key is linked to enable the latch and dead bolt to be unlocked. 2. The door lock according to claim 1, wherein the guest key cylinder has changeable unlocking conditions. 3 The cylinder for the guest key has a body pocket on the cylinder body and a plug pocket on the cylinder plug, and the upper and lower pins are slidably held in these pockets, so that the boundary line between the upper and lower pins is between the cylinder body and the cylinder. The cylinder plug is capable of rotating when it coincides with a sliding line that is a boundary line with the plug, and an auxiliary pocket is provided in the cylinder body at a position corresponding to the plug pocket at a certain rotational position from the body pocket. On the other hand, a chain pin is inserted between the upper and lower pins or removed from between these pins, and the chain pin is inserted between the plug pocket and the auxiliary pocket at a position corresponding to the plug pocket and the auxiliary pocket. The door lock according to claim 2, wherein the door lock can be exchanged between the two. 4. The door lock according to claim 3, wherein the change pin interposed between the upper pin and the lower pin is in contact with the upper pin on the same plane, and the lower pin is connected to the lower pin via an action pin. . 5 At the corresponding position between the plug pocket and the auxiliary pocket, a magnet provided on the auxiliary upper pin of the auxiliary pocket attracts the working pin to release the connection between the lower pin and the change pin, and inserts the matching key at the corresponding position. , by positioning the chain pin on the auxiliary pocket side and aligning the boundary line between the chain pin and the lower pin with the sliding line, or
Alternatively, the door lock according to claim 4, in which the change pin is positioned on the plug pocket side, and only the head of the working pin that is attracted to the magnet of the change pin is removably inserted into the auxiliary upper pin on the auxiliary pocket side. 6. To allow the change pin to escape from the auxiliary upper pin on the auxiliary pocket side, taper surfaces are formed on the head of the working pin and the open end of the auxiliary upper pin into which the head enters, and in the direction of the sliding line of the cylinder plug. 6. The door lock according to claim 5, wherein the operating pin head is guided by the open end of the auxiliary upper pin by the rotational force of the auxiliary upper pin. 7. The change pin has a small-diameter protrusion that fits into the lower pin and a tapered part formed continuously with the small-diameter protrusion, and the change pin can be inserted into the plug pocket by inserting a matching key at the corresponding position between the plug pocket and the auxiliary pocket. Either position the chain pin on the side and align the boundary line between the chain pin and the auxiliary upper pin of the auxiliary pocket with the sliding line, or position the chain pin on the auxiliary pocket side and align only the small diameter protrusion of the chain pin with the lower pin on the plug pocket side. The door lock according to claim 4, which is removably fitted into the door lock. 8 A patent in which the chain pin located on the side of the auxiliary pocket escapes from the lower pin by guiding the tapered part of the chain pin at the corner of the enlarged stepped part provided in the auxiliary pocket by the turning force of the cylinder plug in the sliding line direction. A door lock according to claim 7.