JP3406473B2 - Cylinder lock - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder lock. When a plug is inserted into a cylinder case, the plug is prevented from being removed in the axial direction by a withdrawal prevention means, so that the plug cannot be removed. Regarding

[0002]

2. Description of the Related Art A cylinder lock has a plug rotatably inserted into a cylinder case fixed to a door or the like to prevent movement in the axial direction. When a key is not inserted into a keyhole, the plug is locked. Since the tip of the tumbler protruding from the outer peripheral surface of is engaged with the cylinder case, it is prevented from rotating. When the key is inserted into the key hole, the tumbler pressed by the key is retracted into the outer peripheral surface of the plug, so it can be rotated.When the key is rotated to set the plug to the unlocking angle, the door unlocks and opens. The door becomes possible.

In a cylinder lock, a plurality of tumblers each have a unique code, and by arranging the tumblers having the unique codes, a key code unique to the cylinder lock is created, and a regular key that matches the key code. Since it can be unlocked only when used, it has extremely high anti-theft property and is widely used in various products. As means for preventing the axial movement of the plug of the cylinder lock, a stopper ring as described in Japanese Patent Application Laid-Open No. 7-217270, a nut as described in Japanese Utility Model Application Laid-Open No. 7-14041, etc. There is a stop tumbler described in JP-A-8-4379.

As shown in FIG. 20, the plug movement preventing means using the stopper ring has a plug 51 which is rotatably inserted in the inner peripheral surface of the cylinder case 50.
A flange portion 52 is provided at the right end portion thereof, and a stopper ring 54 is fitted into an annular groove 53 provided around the outer peripheral surface of the plug 51. Therefore, the plug 51 has the stopper ring 5
Axial movement is blocked by 4 and the collar portion 52.

The plug movement preventing means using a nut does not use the stopper ring 54, but the washer 56 is inserted into the shaft portion 55 extending to the rear end of the plug 51 and having the male screw 55a threaded on the outer periphery thereof so that the male screw 55a is fitted to the shaft portion 55. Nut 57 to be screwed
The flange portion 52 prevents the plug 51 from moving in the axial direction. The stop movement means of the plug by the stop tumbler engages the stop tumbler inserted in the plug with the cylinder case.

[0006]

The means for preventing the movement of the plug by the stop tumbler is an operation of inserting the plug into which the key has been inserted into the cylinder case. The stop tumbler engages with the cylinder case and the plug moves in the axial direction. Since it is impossible to move, there is an advantage that the assembly work is simple and easy, but a malicious person can forcibly pull in the stopper tumbler by picking to pull out the plug, or apply a strong pulling force to the plug to make the stopper tumbler. violent disruption <br/> line dividing sometimes, it is impossible to completely prevent this. SUMMARY OF THE INVENTION It is an object of the present invention to provide a cylinder lock in which a plug tampered with a stopper tumbler to prevent axial movement of the plug prevents the incorporated plug from being pulled out and has a simple structure. .

[0007]

In order to achieve the above object, a cylinder lock according to the present invention comprises a cylinder case having an engaging groove on its inner peripheral surface, and a plug rotatably inserted into the cylinder case. A pull-out preventing member that prevents the plug from moving in the axial direction, and a tumbler that is inserted into the plug, is biased in a direction in which the tip projects, and engages with the engaging groove.
A cylinder lock in which the tumbler is retracted and the engagement is released when a key is inserted into a key hole of the plug, wherein the withdrawal prevention member protrudes from a rear end portion of an inner peripheral surface of the cylinder case. And an annular wall having a recess formed on the inner peripheral edge thereof,
The plug is inserted into the rear part of the plug, and the tip is biased in a direction projecting from the outer peripheral surface of the plug. The plug is inserted into the recess when the plug is inserted, and is inserted into the recess. It is configured to include a snap stop tumbler that is engaged with the rear surface of the annular wall, and the recess of the annular wall and the engagement groove are in positions that do not overlap with each other, and at least by the height of the recess. Engagement is maintained and the administrator
When you need to remove the lug, unlock it properly.
The snap stop tumbler engaged with the annular wall
It is characterized in that the plug can be pulled out and the plug can be pulled out .

[0008] <br/> inclined surface at the tip portion of the snap stop tumblers are formed, the distal end portion is engaged into the engaging groove of the cylinder casing on insertion of the plug, by the rotation of the plug the inclined surface on the cylinder casing is contact of the guide in a direction in which immerses the snap stop tumblers
Can not Rukoto. When the above key is fully inserted,
Click groove into which the snap stop tumbler fits
It may be provided to the tip of the key. The snap stop tumblers are inserted into through holes provided in the plug, may tip Ru is constituted by a pair of snap stop tumblers which are biased in opposite directions.

[0009], it is fitted in the groove of the plug,
Tip is engaged in the notch of the tumble La, further comprising a stop plate for restricting the amount of projection of the tumbler, the ends of the <br/> stop plate, to form a pair of leg portions, the flop < in the groove of the br /> lag, when the leg portion forms a Rukakarigo recess is engaged, the stop plate is fitted, engages the leg in the notch of the <br/> tumbler You may enter by Ru.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a cylinder lock.
2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 2, FIG. 4 is a sectional view taken along the arrow C of FIG. 1, FIG. 5 is a sectional view taken along the line D-D of FIG. 2, and FIG. It is a side view of a cylinder lock. Cylinder lock
A flange portion 2 is provided at a front end portion (right side in FIGS. 1 and 6) of an outer peripheral surface of a cylinder-shaped cylinder case 1.

At the front end of the inner peripheral surface 3 of the cylinder case 1, there is formed a collar accommodating portion 4 into which a collar portion 10 formed at the front end of a plug 9 to be described later is inserted (see FIG. 3). The accommodating portion 4 is provided with a cutout portion 5 that avoids interference with a rotation restriction protrusion (not shown) connected to the collar portion 10 of the plug 9 (see FIG. 14, which is a front view of the cylinder case 1). . An annular wall 6 projecting from the inner peripheral surface 3 is provided at the rear end of the cylinder case 1, and recesses 7 having a depth smaller than the height of the annular wall 6 are provided at two opposing inner ends of the annular wall 6. Is provided.

Engagement grooves 8 reaching the annular wall 6 from the front end of the cylinder case 1 are provided at two opposite positions on the inner peripheral surface 3 of the cylinder case 1. Recess 7 and engagement groove 8 of annular wall 6
Are relatively non-overlapping positions, but relatively close to each other (see FIG. 14).

[0013] Help is rotatably inserted into the inner circumferential surface 3 of the cylinder casing 1 lug 9, the flange portion 10 is provided on the tip, the rear, after the intermediate shaft portion 11 to be inserted into the annular wall 6 On the edge
Further, a shaft portion 12 having a smaller diameter is provided (see FIG. 5). At the center of the plug 9, there is provided a key hole 13 opening to the front surface of the plug 9, and a keyway hole 14, which crosses the key hole 13 and penetrates the outer peripheral surface of the plug 9, five tumbler holes 15, and a snap stop. The tumbler holes 16 are arranged in the axial direction of the plug 9 (see FIG. 5).

Two keyway plates 17 are inserted into the keyway holes 14 in a stacked manner, and five tumbler holes 15 are provided.
Two plate-shaped tumblers 18 are inserted in each of the two sheets, and two plate-shaped snap stop tumblers 19 are inserted in the snap-stop tumbler holes 16 (see FIG. 5). The keyway plate 17 allows only a regular key K to be inserted, and has a key insertion hole 20 that overlaps the keyhole 13 and a protrusion 21 that projects to the inner surface of the key insertion hole 20.
(See FIG. 19), and the width and position of the key groove 22 (see FIGS. 17 and 18) provided on one surface of the regular key K match the protrusion 21.

On the other surface of the key K, two key grooves 23 indicating the respective key codes depending on the height are provided (see FIGS. 7 and 17), and the two tumblers 18 each have a key hole. A key insertion hole 24 communicating with 13 is provided, and a protrusion 25 is provided on the inner surface of the key insertion hole 24. The protrusion 25 of one of the two tumblers 18 engages with the one key groove 23, and the protrusion 25 of the other tumbler 18 'engages with the other key groove 23 (see FIG. 15).

A cutout 26 into which a stop plate 28 described later is engaged is provided at one end of the tumbler 18, and a cutout 27 into which a spring 40 is inserted is provided at the other end (see FIG. 15 ). One end of the spring 40 is in the cutout portion 27 of one tumbler 18, and the other end is the other tumbler 18 '.
The tumblers 18 and 18 'are pressed against the notches 27 of the
Are biased in the opposite directions, their tips project from the plug 9 and engage with the engaging groove 8 of the cylinder case 1 to constrain the plug 9 from turning, but the key K is inserted into the plug 9. Then, the plug 9 becomes rotatable.

The plug 9 is provided with a groove 29 penetrating from the outer surface of the plug 9 to the tumbler hole 15 and the snap stop tumbler hole 16, and the stop plate 28 is inserted into the groove 29 (the cylinder lock is inserted from the rear side). See FIG. 11 which is a sectional view. A notch 31 is formed at both ends of the stop plate 28, the notch 31 having an opening at the front end in the insertion direction, and a pair of elastically deformable legs 28 a, 28 on both sides of the notch 31.
b is provided. Engaging protrusions 30 are provided on the legs 28a and 28b (see FIG. 5).

The engagement protrusion 30 of the stop plate 28 is
At the time of insertion, the leg portions 28a and 28b are elastically compressed and deformed to be inserted into the groove 29 at the time of insertion, and the engaging protrusions 30 are provided on both end surfaces of the groove 29 when completely inserted. The stop plate 28 is engaged with the engaging recess 32 and is fixed to the cylinder case 1 by a one-touch operation of merely inserting the stop plate 28, and the main body portion of the stop plate 28 and one leg portion 28.
a engages with the notch 26 of the tumbler 18, and the other leg 2
8b engages with a notch portion 34 (see FIGS . 11 and 16 ) of the snap stop tumbler 19 described later.

At the rear end portion of the stop plate 28 in the insertion direction, in order to avoid interference with the annular wall 6 of the cylinder case 1, the recess 3 matching the outer peripheral surface of the intermediate shaft portion 11 at the time of mounting.
3 are provided (see FIG. 5). The cutout portion 31 is provided at a position that does not engage with the tumbler 18 or the snap stop tumbler 19.

The snap stop tumbler 19 has a notch 34 at one end and a notch 35 at the other end.
A key insertion hole 36 is provided in the center. Similar to the tumbler 18, the pair of snap stop tumblers 19 are biased in opposite directions by the spring 37 inserted into the cutout portion 35. A mountain-shaped tip portion 38 having an inclined surface 38a is formed at the tip of the snap stop tumbler 19 in the biasing direction (see FIGS. 11 and 16).

A taper portion is provided at the tip of the key K, and a click groove 39 with which the snap stop tumbler 19 engages when the key K is completely inserted is provided near the tip (see FIG. 7). The tip portion 38 of the snap stop tumbler 19 slightly sinks toward the plug 9 when the key K is inserted into the key insertion hole 36, but the tip portion 38 is at a position higher than the inner peripheral surface 3 of the cylinder case 1, It is engaged with the engagement groove 8 (a sectional view of the cylinder lock as seen from the rear side in FIG. 8).
reference).

Next, the operation of the cylinder lock configured as described above will be described in the order of the operation of inserting the plug 9 into the cylinder case 1 and the state of the cylinder lock after inserting the plug 9. Before the plug 9 is inserted into the cylinder case 1, the tip of the tumbler 18 and the tip 38 of the snap stop tumbler 19 protrude from the outer peripheral surface of the plug 9, and the amount of protrusion is restricted by the stop plate 28.

When the key K is inserted into the key hole 13 of the plug 9, the protrusion 21 of the keyway plate 17 passes through the key groove 22 of the key K, and then the tumbler 18 pressed by the key groove 23 of the key K is removed. The taper portion that is immersed in the outer peripheral surface of the plug 9 and is formed at the tip of the key K has a snap stop tumbler 1.
When the key K is completely inserted, the snap stop tumbler 19 is engaged with the click groove 39 of the key K when the key K is completely inserted.

When the plug 9 is inserted into the inner peripheral surface 3 of the cylinder case 1 (see FIG. 7), the tip end portion 38 of the snap stop tumbler 19 comes into contact with the annular wall 6 and the insertion of the plug 9 is stopped. When the key K is rotated counterclockwise in FIG. 11 (clockwise in FIG. 14, which is a front view of the cylinder case), the plug 9 rotates in the same direction along the inner peripheral surface 3 of the cylinder case 1. The distal end portion 38 that has moved and pushed the inclined surface 38a against the side surface of the engagement groove 8 receives the component force in the immersing direction and immerses and contacts the inner peripheral surface 3 (see FIG. 9).

Since the inner peripheral surface 3 and the recessed portion 7 of the annular wall 6 are formed in a continuous manner, when a pushing force is applied to the key K, the tip end portion 38 slides in contact with the recessed portion 7 and is rearward of the annular wall 6. When the plug 9 is completely inserted, the tip 38 that has passed through the recess 7 projects and engages with the rear surface of the annular wall 6 (see FIG. 10).

When the key K is returned to the insertable / removable angle, the position of the tip portion 38 becomes the position shown in FIG. 11, and when the key K is pulled out from the key hole 13 of the plug 9, the snap stop tumbler 1
Since 9 is released from the pressing of the click groove 39, it further projects until it comes into contact with the leg portion 28b of the stop plate 28 (see FIG. 4). Therefore, when the key K is pulled out at the position where the key K can be inserted / removed (see FIG. 4), the snap stop tumbler 19 moves from the position of FIG. 4 by the outer surface of the key K (between the tip portion and the click groove 39). Is further retracted, but the engagement with the annular wall 6 is not released.

Further, even if the snap stop tumbler 19 is pulled in by picking or the like, the top portion 6 of the annular wall 6 is pulled.
a (see FIG. 13) or the stop plate 28 restricting the sinking, the engagement is maintained at least by the height of the recess 7, and the plug 9 cannot be pulled out at this position. Is. Therefore, the contact area between the tip portion 38 and the annular wall 6 is maximized, and since the tip portions 38 of the two snap stop tumblers 19 are at the opposite positions, the force that prevents the plug 9 from being prevented from being pulled out due to breakage. Since the lock is large and the locking cannot be released even when the tip portion 38 is retracted, the plug 9 cannot be pulled out.

No matter how a malicious third person operates from the front of the cylinder lock, the plug 9 cannot be removed, but when the administrator needs to remove the plug 9, the cylinder lock can be unlocked properly. Then, when the door to which the cylinder lock is attached is opened and the snap stop tumbler 19 engaged with the annular wall 6 is retracted from the rear of the cylinder lock, the plug 9 can be pulled out.

Depending on the door in which the cylinder lock is installed, there is a case in which a detection member which comes into contact with the tip end surface of the key K with spring pressure is provided in order to detect the complete insertion of the key K (Japanese Patent Publication No. 1-15117). reference). Since this detection member applies a contact pressure to the tip end surface of the key K, there is a possibility that the key K at the completely inserted position may be pressed and become incompletely inserted.

However, in the cylinder lock according to the present invention, the snap stop tumbler 19 pushed to the tip of the key K near the complete insertion has the click groove 3 at the complete insertion position of the plug 9.
Since the plug 9 is engaged with the plug 9 and the plug 9 is lightly locked at the completely inserted position, there is no possibility that the key K will be pushed back to the incompletely inserted position even if the detection pressure is applied to the tip of the fully inserted key K.

In the above embodiment, the tip end portion 38 of the snap stop tumbler 19 is formed into a mountain shape having the inclined surface 38a, and the inclined stop surface 38a allows the snap stop tumbler 19 to be recessed so that the tip portion 38 is set in the recess 7. Although it is made to be inserted, an inclined surface is provided toward the tip of the case 1 which is an extension of the concave portion 7, and the snap stop tumbler 19 that abuts this inclined surface is made to immerse so as to generate a component force in the immersing direction. The tip 38 can also be inserted and guided in the recess 7.

[0032]

Since the present invention is constructed as described above, it has the following effects. (1) In the cylinder lock of the present invention, since the pull-out preventing member is configured by the annular wall having the recess formed in the rear portion of the cylinder case and the snap stop tumbler biased in the direction of protruding from the plug, the plug is inserted. It became impossible to remove the plug with a simple operation, and the removal of the plug is now reliably prevented.

[0033] (2) snap contact area between the stop tumblers and the annular wall can be increased, moreover, than was a pair of snap stop tumblers which are biased snap stop tumblers in the opposite direction, the direction extraction of the plug It is possible to maintain sufficient strength against external force. (3) The snap stop tumbler can be used as a click mechanism that lightly holds (clicks) the key in the fully inserted state. (4) When the stop plate is fitted on the plug, the snap stop tumbler and the member for controlling the protruding amount of the tumbler can be easily attached.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a cylinder lock.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a view on arrow C of FIG.

5 is a cross-sectional view taken along line DD of FIG.

FIG. 6 is a side view of a cylinder lock.

FIG. 7 is a vertical cross-sectional view illustrating insertion of a plug.

FIG. 8: E of FIG. 7 explaining the state in which the tip of the snap stop tumbler moves to the recess while being pushed in the direction of immersion.
It is a -E sectional view.

FIG. 9 is a cross-sectional view showing a state in which a tip portion of a snap stop tumbler is inserted into a recess.

FIG. 10 is a cross-sectional view showing a state in which the tip portion of the snap stop tumbler protrudes after passing through the recess.

FIG. 11 is a cross-sectional view illustrating a state of the snap stop tumbler when the plug is rotated to the key removal position.

FIG. 12 is a vertical cross-sectional view illustrating a state before a key is completely inserted.

FIG. 13 is a vertical cross-sectional view illustrating complete insertion of a key.

FIG. 14 is a front view of a cylinder case.

FIG. 15 is a front view of the tumbler.

FIG. 16 is a cross-sectional view of a plug with a snap stop tumbler inserted.

FIG. 17 is a cross-sectional view of the key.

18 is a view on arrow F of FIG.

FIG. 19 is a front view of the keyway plate.

FIG. 20 is a partially cutaway side view of the cylinder lock for explaining the method of preventing the axial movement of the plug.

[Explanation of symbols]

1 Cylinder Case 3 Inner Circumferential Surface 6 Annular Wall 7 Recess 8 Engagement Groove 8 Plug 17 Keyway Plate 18 Tumbler 19 Snap Stop Tumbler 26 Notch 28 Stop Plate 28a, 28b Leg 29 Groove 32 Engagement Recess 37 Spring 38 Tip 38a Inclined surface 39 Click groove K key

Continuation of the front page (56) Reference JP-A-8-120982 (JP, A) JP-A-8-4379 (JP, A) JP-A-7-97878 (JP, A) JP-A-6-58074 (JP , A) Actually open 63-192561 (JP, U) Actually open 2-45256 (JP, U) Actually open 60-97860 (JP, U) Actually open 56-27249 (JP, U) Actually open 63-177568 (JP, U) Actual development Sho 56-133054 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E05B 29/00-29/14 E05B 15/00

Claims (5)

(57) [Claims] 1. A cylinder case having an engagement groove on an inner peripheral surface thereof, a plug rotatably inserted in the cylinder case, a removal preventing member for preventing axial movement of the plug, and a plug for the plug. A tumbler that is inserted and urged in the direction in which the tip projects, and engages with the engagement groove. When the key is inserted into the key hole of the plug, the tumbler is retracted and the engagement is released. In the cylinder lock according to the first aspect of the invention, the removal preventing member is inserted into a rear portion of the plug and an annular wall having a recess formed in an inner peripheral edge of the inner wall of the cylinder case. The plug is biased in a direction of being projected from the outer peripheral surface of the plug, and when the plug is inserted, the tip is recessed and engaged in the recess, and is projected after passing through the recess and engaged with the rear surface of the annular wall. With snap stop tumbler Made, the recess of the annular wall, the said engagement grooves is not overlapping position, by the height of the at least recess engagement is maintained, when the administrator need arises to withdraw the plug Regular
To unlock the snap stop engaged with the annular wall.
The plug tumbler can be immersed from the rear and the plug can be pulled out
Cylinder lock characterized by being made to function . 2. An inclined surface is formed at the tip of the snap stop tumbler, the tip is engaged with the engagement groove of the cylinder case when the plug is inserted, and the cylinder case is rotated by the rotation of the plug. The cylinder lock according to claim 1, wherein the inclined surface is brought into contact with the guide to guide the snap stop tumbler in a direction in which the snap stop tumbler is retracted. 3. The cylinder lock according to claim 1, wherein a click groove into which the snap stop tumbler engages when the key is fully inserted is provided at a tip end portion of the key. 4. The snap stop tumbler is configured by a pair of snap stop tumblers inserted in through holes provided in the plug and having their tips urged in opposite directions. The cylinder lock according to any one of 3 above. 5. A stop plate fitted into the groove of the plug and having a tip end engaged with a cutout portion of the tumbler, the stop plate restricting an amount of protrusion of the tumbler, and both ends of the stop plate. A pair of legs is formed, and an engaging recess for engaging the legs is formed in the groove of the plug, and when the stop plate is fitted, the legs are the notches of the tumbler. 1. The present invention is characterized in that
4. The cylinder lock according to any one of 4 above.