EP0488787B1 - Cylinder lock - Google Patents
Cylinder lock Download PDFInfo
- Publication number
- EP0488787B1 EP0488787B1 EP19910311119 EP91311119A EP0488787B1 EP 0488787 B1 EP0488787 B1 EP 0488787B1 EP 19910311119 EP19910311119 EP 19910311119 EP 91311119 A EP91311119 A EP 91311119A EP 0488787 B1 EP0488787 B1 EP 0488787B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sleeve
- key cylinder
- cylinder
- key
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B17/00—Accessories in connection with locks
- E05B17/04—Devices for coupling the turning cylinder of a single or a double cylinder lock with the bolt operating member
Definitions
- the present invention relates, in general, to lock devices, and more particularly, to a cylinder lock that provides significant resistance to damage or tampering.
- a key cylinder is rotatably mounted within a casing of the lock and a proper key may be inserted into and rotated with the key cylinder from locked to unlocked position.
- Tumblers are slidably disposed within slits formed in the key cylinder to engage with or disengage from a groove formed in a casing of the lock.
- the tumblers engage with the groove in the casing to prevent unauthorized rotation of the key cylinder. Therefore, these locks might involve a risk of unallowed attempts to unlock or tamper by damaging the tumblers.
- a free-turn type cylinder lock wherein the key cylinder is designed to freely rotate against unallowed attempt to unlock when rotational force is applied to the key cylinder.
- a cylinder lock includes a sleeve rotatably arranged in the casing; and a key cylinder supported within the sleeve for rotation.
- the tumblers within the key cylinder are moved for disengagement from the groove formed in the sleeve, and thereby the key cylinder may be rotated independently of the sleeve so that a sliding ring engages with a lock-piece operating member to actuate the lock.
- the sleeve is kept in engaged condition by the tumblers with the key cylinder to rotate them together. This prevents rotation of the lock-piece operating member to inhibit unauthorized actuation of the lock.
- the prior art lock has another disadvantage as it is difficult to apply same to remote locking devices utilizing radio wave or infrared ray. Furthermore, due to axial movement of the sliding ring of the lock of the above U. S. Patent along the key cylinder, another shortcoming is that the lock is large in size and become complex in structure.
- an object of the present invention is to provide a novel cylinder lock with a key cylinder capable of freely rotating against an unauthorized attempt to unlock it.
- the cylinder lock according to the present invention includes a casing; a sleeve rotatably disposed in the casing; a key cylinder disposed rotatably within the sleeve; tumblers slidably disposed within each slit formed in the key cylinder for engagement with the sleeve; and a connector which is drivingly connected to a lock device.
- the cylinder lock also comprises a cam provided on the key cylinder; and at least a pin disposed radially slidably in an opening provided in the sleeve.
- the pin is moved within the opening of the sleeve by rotation of the cam on the key cylinder independently of the sleeve to a predetermined angle when the key cylinder is turned by a proper key so that the pin comes into engagement with the connector which is then rotated together with the key cylinder to unlock the lock device.
- the cylinder lock may comprise a return spring disposed between the sleeve and the cylinder; a first return spring disposed between the sleeve and the cylinder; and a second return spring disposed between the casing and the connector.
- the connector has a cylindrical portion extending outwardly of the sleeve and rotatable relative to and separately of the sleeve.
- the cylindrical portion has a resilient member provided thereon for resiliently urging the pin inwardly.
- the tumblers in the cylinder are moved away from the sleeve for disengagement to cause the key cylinder to turn independently of the sleeve. Then, when the key cylinder is manually rotated, the cam in the key cylinder is rotated. As the pin is in abutting engagement with the cam, the pin slides radially outwardly in the opening in the stationary sleeve and is brought into engagement with the connector. Thus, the key cylinder is rotated within an angular range for sliding of the pin against elastic force of the first return spring.
- the pin radially slides with rotation of the key cylinder against elastic force of the resilient member attached to the connector, but neither the sleeve nor the connector will turn at this time.
- the connector is started to rotate during which the pin is rotated together with the key cylinder, sleeve and connector against elastic force of the second return spring, thereby rendering the connector to rotate into a locking or unlocking position.
- the connector, sleeve and key cylinder are returned to their original position within the rotating range for the connector by resilient force of the second return spring between the casing and the connector.
- the key cylinder is returned to its original position within the angular range for sliding of the pin by elastic force of the first return spring, whereby the pin is moved radially inwardly to the original position by elastic force of the resilient member.
- the key cylinder When the key cylinder is rotated with an incorrect key, the key cylinder is retained in the engaged condition with the sleeve by means of the tumblers so that it turns together with the sleeve. Thus, since the key cylinder will not rotate relative to the sleeve, the pin will not radially move within the opening in the sleeve. Therefore, the key cylinder will not be connected to the connector via the pin, thus preventing rotation of the connector.
- Fig. 1 is a cross-sectional view of a cylinder lock according to the present invention.
- Fig. 2 is a cross-sectional view taken along line 2-2 of Fig. 1.
- Fig. 3 is a cross-sectional view taken along line 3-3 of Fig. 1.
- Fig. 4 is a cross-sectional view taken along line 4-4 of Fig. 1.
- Fig. 5 is cross-sectional view taken along line 5-5 of Fig. 1.
- Fig. 6 is cross-sectional view taken along line 6-6 of Fig. 1.
- Fig. 7 is a rear view of the cylinder lock.
- Fig. 8 is a cross-sectional view taken along line 8-8 of Fig. 7.
- Fig. 9 is a cross-sectional view taken along line 9-9 of Fig. 7.
- Fig. 10 is a plan view illustrating an end of the cylinder lock.
- Fig. 11 is a partial cross-sectional view indicating the key cylinder and sleeve.
- Fig. 12 is a cross-sectional view with the key cylinder turned with a proper key to the maximum angular position within the angular range for sliding of a pin.
- Fig. 13 is a cross-sectional view with the key cylinder turned within the angular range of rotation of the connector.
- Fig. 14 is a cross-sectional view with the key cylinder returned within the angular range for sliding of the pin.
- Fig. 15 is a cross-sectional view with the key cylinder returned to a position for removing the key.
- Fig. 16 is a cross-sectional view with the key cylinder turned to an angle of about 20° with an unacceptable key.
- Fig. 17 is a cross-sectional view with the key cylinder turned to an angle of about 90°.
- Fig. 18 is a cross-sectional view with the key cylinder turned to an angle of about 120°.
- Fig. 19 is a cross-sectional view with the key cylinder turned at an angle of about 360°.
- Fig. 20 is a cross-sectional view illustrating the relationship between the sleeve and key cylinder which has been turned by a proper key to an angle of about 20° from the position of Fig. 3.
- Fig. 21 is a cross-sectional view illustrating the relationship between the sleeve and key cylinder which has been turned by the proper key to an angle of about 65° from the position of Fig. 3.
- Fig. 22 is a cross-sectional view illustrating the relationship between the connector and the casing when the key cylinder has been turned by the proper key to an angle of about 65° from the position of Fig. 4.
- the cylinder lock 10 comprises a casing 11, a sleeve 12 rotatably disposed within the casing 11, and a key cylinder 14 rotatably positioned in sleeve 12.
- the key cylinder 14 has a plurality of tumblers 13 slidably disposed within slits 14d formed in the key cylinder 14 so that the tumblers 13 may protrude into and be engaged with groove 12a of sleeve 12, and the key cylinder 14 is retained in an engaged condition with sleeve 12 by means of tumblers 13 in a well known manner.
- a connector 18 is rotatably attached to an inner end 14c of the key cylinder 14 for example by an E-ring 23.
- the connector 18 has a cylindrical portion 19 positioned outside the sleeve 12 and may rotate relative to and independently of sleeve 12.
- a radial hole 19a Formed in the cylindrical portion 19 is a radial hole 19a in which a pin 20 and a spring 21 are positioned to resiliently urge each pin 16 inwardly toward the cam 15.
- a plate 22 is fixed to the cylindrical portion 19 to prevent detachment of the spring 21.
- the pin 20 has its outer diameter approximately equal to that of pin 16.
- a first return spring 17 is disposed within a space defined by an arcuate groove 14a of key cylinder 14 and arcuate groove 12c of sleeve 12.
- Fig. 4 shows a cross-sectional view along line 4-4 of Fig. 1 in which the sleeve 12 is rotatably positioned inside the casing 11.
- Fig. 5 shows a cross-sectional view along line 5-5 of Fig. 1 in which a latch member 30 and a spring 31 are positioned in an opening 11a formed in casing 11.
- the latch member 30 has a claw 30a which is resiliently urged toward the outer surface of the sleeve by the spring 31.
- a plate 32 is fixed to the casing 11 to prevent detachment of the spring 31.
- FIG. 6 shows a cross-sectional view along line 6-6 in which a notch 14b is formed in key cylinder 14 to receive a latch member 33 and a spring 34 to elastically urge the latch member 33 outwardly.
- a claw 33a is formed with the latch member 33 to engage with a notch 11b formed in the casing 11.
- a second spring 34 is wound around the cylindrical portion 19 of the connector 18.
- the cylindrical portion 19 has a notch defined by edges 19b and 19c
- the casing 11 has a notch defined by edges 11c and 11d.
- Ends 34a and 34b of the second spring 34 are respectively engaged with edges 19b and 19c of the cylindrical portion 19, and edges 11c and 11d of the casing 11.
- the casing is formed with a flange 11e.
- the connector 18 is drivingly connected to a locking mechanism such as a door lock device by a rod in a known manner.
- the sleeve 12, key cylinder 14 and connector 18 are in the locked condition as shown in Figs. 1 through 9.
- the tumblers 13 are moved in the key cylinder 14 for disengagement from the sleeve 12, thus permitting key cylinder 14 to rotate independently of the sleeve 12.
- the sleeve 12 is held in a static condition due to its engagement with the latch member 30, while the pin 16 slides outwardly within the opening 12b of sleeve 12 from the inner position of Fig. 2 to the outer position of Fig. 12 by means of the rotating cam 15 of the key cylinder 14. Accordingly, the outer end of the pin 16 comes into engagement with the hole 19a formed in the cylindrical portion 19 of the connector 18.
- the second return spring 34 positioned between casing 11 and connector 18 forcibly and elastically pushes the connector 18, sleeve 12 and key cylinder 14 to return from the rotated position of Fig. 13 to the initial position of Fig. 14 in the angular range of rotation of connector 18.
- the key cylinder 14 is forced to return from the position of Fig. 14 to the initial position of Fig. 15 by virtue of elastic force of the first return spring 17 within the angular range for sliding of the pin 16 which is then radially and inwardly moved by elastic force of the spring 21 to the initial position.
- the key cylinder 14 is rotated by an incorrect key, it is moved from the locked condition of Fig. 2 to the condition of Fig. 16, while the key cylinder 14 is retained in engaged condition with the sleeve 12 by tumblers 13 to rotate the key cylinder 14 and the sleeve 12 together.
- the pin 16 will not radially move within opening 12b of sleeve 12.
- the key cylinder 14 will not engage with connector 18 via pin 16, thus preventing rotation of the connector 18. Therefore, the sleeve 12 and key cylinder 14 are freely rotated as Figs. 17, 18 and 19 respectively indicate rotation thereof to about 90°, 120° and 360°.
- the cylinder lock 10 allows the key cylinder 14 to turn together with sleeve 12 when an incorrect key is used to unlock, thus preventing rotation of connector 18. Therefore, no excessive external forces will be exerted on the tumblers 13, thus providing significant resistance to damage. Moreover, since the pin 16 may move radially, the key cylinder 14 may be made in reduced length for reduced size of the cylinder lock 10.
- a single pin 16 may be utilized to connect the key cylinder 14 and the connector 18.
- pin tumblers may be used in lieu of tumblers 13 of disk type in the above embodiment.
- the cam 15 may be formed in an additional member which can rotate together with key cylinder 14.
- the cylinder lock according to the present invention provides significant resistance to damage, thus effectively preventing unauthorized intrusion or theft.
Description
- The present invention relates, in general, to lock devices, and more particularly, to a cylinder lock that provides significant resistance to damage or tampering.
- In a conventional cylinder lock, a key cylinder is rotatably mounted within a casing of the lock and a proper key may be inserted into and rotated with the key cylinder from locked to unlocked position. Tumblers are slidably disposed within slits formed in the key cylinder to engage with or disengage from a groove formed in a casing of the lock. In prior art cylinder locks, the tumblers engage with the groove in the casing to prevent unauthorized rotation of the key cylinder. Therefore, these locks might involve a risk of unallowed attempts to unlock or tamper by damaging the tumblers.
- For example, as disclosed in U. S. Patent No. 4,903,512, a free-turn type cylinder lock has been proposed wherein the key cylinder is designed to freely rotate against unallowed attempt to unlock when rotational force is applied to the key cylinder. Such a cylinder lock includes a sleeve rotatably arranged in the casing; and a key cylinder supported within the sleeve for rotation. When a correct key is inserted into the key cylinder, the tumblers within the key cylinder are moved for disengagement from the groove formed in the sleeve, and thereby the key cylinder may be rotated independently of the sleeve so that a sliding ring engages with a lock-piece operating member to actuate the lock. If an incorrect key is inserted into the key cylinder, the sleeve is kept in engaged condition by the tumblers with the key cylinder to rotate them together. This prevents rotation of the lock-piece operating member to inhibit unauthorized actuation of the lock.
- If an incorrect key is inserted into the key cylinder of such free-turn type cylinder lock and then rotated, the key cylinder freely rotates with the incorrect key, and there will not be produced excessive force that might damage the tumblers and therefore significant resistance of the locks to damage is obtained. However, the lock disclosed in U. S. Patent No. 4,903,512 has the disadvantage that the key cylinder cannot be turned smoothly once an unauthorized key is inserted and rotated. A torsion coil spring is provided between the front plate and the key cylinder within the lock in order to automatically return the rotated key cylinder to its initial position. If an incorrect key is inserted into the key cylinder and rotated, the sleeve and the key cylinder are freely turned together, then the torsion coil spring produces a resisting force. However, if they are rotated over a predetermined angle, the torsion coil spring restricts rotation of the key cylinder. This might pose a possibility that the torsion coil spring may be broken or damaged. However, without the torsion coil spring, the key cylinder will not be automatically returned to its initial position when the key cylinder is rotated with the correct key. Accordingly, the prior art lock has another disadvantage as it is difficult to apply same to remote locking devices utilizing radio wave or infrared ray. Furthermore, due to axial movement of the sliding ring of the lock of the above U. S. Patent along the key cylinder, another shortcoming is that the lock is large in size and become complex in structure.
- Accordingly, an object of the present invention is to provide a novel cylinder lock with a key cylinder capable of freely rotating against an unauthorized attempt to unlock it.
- It is another object of the present invention to provide a compact-sized free-turn type cylinder lock.
- The cylinder lock according to the present invention includes a casing; a sleeve rotatably disposed in the casing; a key cylinder disposed rotatably within the sleeve; tumblers slidably disposed within each slit formed in the key cylinder for engagement with the sleeve; and a connector which is drivingly connected to a lock device. The cylinder lock also comprises a cam provided on the key cylinder; and at least a pin disposed radially slidably in an opening provided in the sleeve. The pin is moved within the opening of the sleeve by rotation of the cam on the key cylinder independently of the sleeve to a predetermined angle when the key cylinder is turned by a proper key so that the pin comes into engagement with the connector which is then rotated together with the key cylinder to unlock the lock device.
- The cylinder lock may comprise a return spring disposed between the sleeve and the cylinder; a first return spring disposed between the sleeve and the cylinder; and a second return spring disposed between the casing and the connector.
- The connector has a cylindrical portion extending outwardly of the sleeve and rotatable relative to and separately of the sleeve. The cylindrical portion has a resilient member provided thereon for resiliently urging the pin inwardly.
- When an correct key is inserted into the key cylinder, the tumblers in the cylinder are moved away from the sleeve for disengagement to cause the key cylinder to turn independently of the sleeve. Then, when the key cylinder is manually rotated, the cam in the key cylinder is rotated. As the pin is in abutting engagement with the cam, the pin slides radially outwardly in the opening in the stationary sleeve and is brought into engagement with the connector. Thus, the key cylinder is rotated within an angular range for sliding of the pin against elastic force of the first return spring. Within the angular range for sliding of the pin, the pin radially slides with rotation of the key cylinder against elastic force of the resilient member attached to the connector, but neither the sleeve nor the connector will turn at this time. When the key cylinder is rotated further over the angular range for sliding of the pin, the connector is started to rotate during which the pin is rotated together with the key cylinder, sleeve and connector against elastic force of the second return spring, thereby rendering the connector to rotate into a locking or unlocking position. If manually rotational force is released from the correct key, the connector, sleeve and key cylinder are returned to their original position within the rotating range for the connector by resilient force of the second return spring between the casing and the connector. Subsequently, the key cylinder is returned to its original position within the angular range for sliding of the pin by elastic force of the first return spring, whereby the pin is moved radially inwardly to the original position by elastic force of the resilient member.
- When the key cylinder is rotated with an incorrect key, the key cylinder is retained in the engaged condition with the sleeve by means of the tumblers so that it turns together with the sleeve. Thus, since the key cylinder will not rotate relative to the sleeve, the pin will not radially move within the opening in the sleeve. Therefore, the key cylinder will not be connected to the connector via the pin, thus preventing rotation of the connector.
- The above-mentioned as well as other objects of the present invention will become apparent during the course of the following detailed description and appended claims.
- Fig. 1 is a cross-sectional view of a cylinder lock according to the present invention.
- Fig. 2 is a cross-sectional view taken along line 2-2 of Fig. 1.
- Fig. 3 is a cross-sectional view taken along line 3-3 of Fig. 1.
- Fig. 4 is a cross-sectional view taken along line 4-4 of Fig. 1.
- Fig. 5 is cross-sectional view taken along line 5-5 of Fig. 1.
- Fig. 6 is cross-sectional view taken along line 6-6 of Fig. 1.
- Fig. 7 is a rear view of the cylinder lock.
- Fig. 8 is a cross-sectional view taken along line 8-8 of Fig. 7.
- Fig. 9 is a cross-sectional view taken along line 9-9 of Fig. 7.
- Fig. 10 is a plan view illustrating an end of the cylinder lock.
- Fig. 11 is a partial cross-sectional view indicating the key cylinder and sleeve.
- Fig. 12 is a cross-sectional view with the key cylinder turned with a proper key to the maximum angular position within the angular range for sliding of a pin.
- Fig. 13 is a cross-sectional view with the key cylinder turned within the angular range of rotation of the connector.
- Fig. 14 is a cross-sectional view with the key cylinder returned within the angular range for sliding of the pin.
- Fig. 15 is a cross-sectional view with the key cylinder returned to a position for removing the key.
- Fig. 16 is a cross-sectional view with the key cylinder turned to an angle of about 20° with an unacceptable key.
- Fig. 17 is a cross-sectional view with the key cylinder turned to an angle of about 90°.
- Fig. 18 is a cross-sectional view with the key cylinder turned to an angle of about 120°.
- Fig. 19 is a cross-sectional view with the key cylinder turned at an angle of about 360°.
- Fig. 20 is a cross-sectional view illustrating the relationship between the sleeve and key cylinder which has been turned by a proper key to an angle of about 20° from the position of Fig. 3.
- Fig. 21 is a cross-sectional view illustrating the relationship between the sleeve and key cylinder which has been turned by the proper key to an angle of about 65° from the position of Fig. 3.
- Fig. 22 is a cross-sectional view illustrating the relationship between the connector and the casing when the key cylinder has been turned by the proper key to an angle of about 65° from the position of Fig. 4.
- Referring to Figs. 1 to 22, an embodiment of the present invention will be described.
- As illustrated in Fig. 1, the
cylinder lock 10 according to the present invention comprises acasing 11, asleeve 12 rotatably disposed within thecasing 11, and akey cylinder 14 rotatably positioned insleeve 12. As illustrated in Fig. 8 and Fig. 11, thekey cylinder 14 has a plurality oftumblers 13 slidably disposed withinslits 14d formed in thekey cylinder 14 so that thetumblers 13 may protrude into and be engaged withgroove 12a ofsleeve 12, and thekey cylinder 14 is retained in an engaged condition withsleeve 12 by means oftumblers 13 in a well known manner. As will be apparent from Fig. 2, which shows a cross-sectional view along line 2-2 of Fig. 1, formed on thekey cylinder 14 is acam 15 to which each inner end of a pair ofpins 16 is abutted. The outer end of eachpin 16 is radially slidably positioned in acorresponding opening 12b radially formed in thesleeve 12. As shown in Figs. 1, 7 and 8, aconnector 18 is rotatably attached to aninner end 14c of thekey cylinder 14 for example by an E-ring 23. Theconnector 18 has acylindrical portion 19 positioned outside thesleeve 12 and may rotate relative to and independently ofsleeve 12. Formed in thecylindrical portion 19 is aradial hole 19a in which apin 20 and aspring 21 are positioned to resiliently urge eachpin 16 inwardly toward thecam 15. Aplate 22 is fixed to thecylindrical portion 19 to prevent detachment of thespring 21. Thepin 20 has its outer diameter approximately equal to that ofpin 16. When a correct key is removed fromkey cylinder 14, the outer end of thepin 16 does not protrude outside theopening 12b ofsleeve 12, but may be positioned at the boundary betweensleeve 12 andcylindrical section 19. As illustrated in Fig. 3 showing a cross-sectional view taken along line 3-3 of Fig. 1, afirst return spring 17 is disposed within a space defined by anarcuate groove 14a ofkey cylinder 14 andarcuate groove 12c ofsleeve 12. Fig. 4 shows a cross-sectional view along line 4-4 of Fig. 1 in which thesleeve 12 is rotatably positioned inside thecasing 11. Fig. 5 shows a cross-sectional view along line 5-5 of Fig. 1 in which alatch member 30 and aspring 31 are positioned in anopening 11a formed incasing 11. Thelatch member 30 has aclaw 30a which is resiliently urged toward the outer surface of the sleeve by thespring 31. Aplate 32 is fixed to thecasing 11 to prevent detachment of thespring 31. Theclaw 30a oflatch member 30 engages with anotch 12d formed insleeve 12. Fig. 6 shows a cross-sectional view along line 6-6 in which a notch 14b is formed inkey cylinder 14 to receive alatch member 33 and aspring 34 to elastically urge thelatch member 33 outwardly. Aclaw 33a is formed with thelatch member 33 to engage with anotch 11b formed in thecasing 11. As shown in Figs. 8 and 9, asecond spring 34 is wound around thecylindrical portion 19 of theconnector 18. Thecylindrical portion 19 has a notch defined byedges casing 11 has a notch defined byedges Ends second spring 34 are respectively engaged withedges cylindrical portion 19, and edges 11c and 11d of thecasing 11. The casing is formed with aflange 11e. Not shown, but theconnector 18 is drivingly connected to a locking mechanism such as a door lock device by a rod in a known manner. - Before a key is inserted into the
cylinder lock 10, thesleeve 12,key cylinder 14 andconnector 18 are in the locked condition as shown in Figs. 1 through 9. When an correct key is inserted into thekey cylinder 14, thetumblers 13 are moved in thekey cylinder 14 for disengagement from thesleeve 12, thus permittingkey cylinder 14 to rotate independently of thesleeve 12. Then, when thekey cylinder 14 is rotated, thesleeve 12 is held in a static condition due to its engagement with thelatch member 30, while thepin 16 slides outwardly within theopening 12b ofsleeve 12 from the inner position of Fig. 2 to the outer position of Fig. 12 by means of the rotatingcam 15 of thekey cylinder 14. Accordingly, the outer end of thepin 16 comes into engagement with thehole 19a formed in thecylindrical portion 19 of theconnector 18. - Therefore, when the
key cylinder 14 is turned within the angular range for sliding of thepin 16 against elastic force of thefirst return spring 17 from the initial position of Fig. 2 to the position shown in Figs. 12, thefirst return spring 17 is compressed as shown in Figs. 3 and 20. As thekey cylinder 14 turns within the angular range for sliding of thepin 16, thepin 16 radially slides against elastic force ofspring 21 within thecylindrical portion 19 without rotation of thesleeve 12 by thelatch member 30 andconnector 18 due to the only radial movement of thepin 16. Whenkey cylinder 14 is further rotated beyond the angular range for sliding of thepin 16, thekey cylinder 14,sleeve 12,pin 16 andconnector 18 are together rotated from the position shown in Fig. 12 to that in Fig. 13 against elastic force of thesecond return spring 34 in the rotating range of theconnector 18 which thus can be turned to a locked or unlocked position. Thefirst return spring 17 is then forced from the condition of Fig. 20 to the state of Fig. 21 while thecylindrical portion 19 is moved from the locked position of Fig. 4 to the rotated condition of Fig. 22. - When manual operation force is released from the rotated key, the
second return spring 34 positioned betweencasing 11 andconnector 18 forcibly and elastically pushes theconnector 18,sleeve 12 andkey cylinder 14 to return from the rotated position of Fig. 13 to the initial position of Fig. 14 in the angular range of rotation ofconnector 18. Subsequently, thekey cylinder 14 is forced to return from the position of Fig. 14 to the initial position of Fig. 15 by virtue of elastic force of thefirst return spring 17 within the angular range for sliding of thepin 16 which is then radially and inwardly moved by elastic force of thespring 21 to the initial position. - On the other hand, if the
key cylinder 14 is rotated by an incorrect key, it is moved from the locked condition of Fig. 2 to the condition of Fig. 16, while thekey cylinder 14 is retained in engaged condition with thesleeve 12 bytumblers 13 to rotate thekey cylinder 14 and thesleeve 12 together. Thus, without production of relative rotation of thekey cylinder 14 to thesleeve 12, thepin 16 will not radially move withinopening 12b ofsleeve 12. In other words, thekey cylinder 14 will not engage withconnector 18 viapin 16, thus preventing rotation of theconnector 18. Therefore, thesleeve 12 andkey cylinder 14 are freely rotated as Figs. 17, 18 and 19 respectively indicate rotation thereof to about 90°, 120° and 360°. - As above-mentioned, the
cylinder lock 10 according to the present invention allows thekey cylinder 14 to turn together withsleeve 12 when an incorrect key is used to unlock, thus preventing rotation ofconnector 18. Therefore, no excessive external forces will be exerted on thetumblers 13, thus providing significant resistance to damage. Moreover, since thepin 16 may move radially, thekey cylinder 14 may be made in reduced length for reduced size of thecylinder lock 10. - According to the present invention, a
single pin 16 may be utilized to connect thekey cylinder 14 and theconnector 18. In addition, pin tumblers may be used in lieu oftumblers 13 of disk type in the above embodiment. Thecam 15 may be formed in an additional member which can rotate together withkey cylinder 14. - As described above, the cylinder lock according to the present invention provides significant resistance to damage, thus effectively preventing unauthorized intrusion or theft.
Claims (6)
- A cylinder lock (10) including a casing (11); a sleeve (12) rotatably disposed in said casing; a key cylinder (14) disposed rotatably within said sleeve; tumblers (13) slidably disposed within each slit (14d) formed in said key cylinder for engagement with the sleeve; and a connector (18) drivingly connected to a lock device; characterised by a cam (15) provided on the key cylinder (14); and at least a pin (16) disposed radially slidably in an opening (12b) provided in the sleeve (12), said pin being moved within the opening of the sleeve by rotation of the cam on the key cylinder independently of the sleeve to a predetermined angle when the key cylinder is turned by a proper key so that the pin comes into engagement with the connector which is then rotated together with the key cylinder to unlock the lock device.
- A cylinder lock as claimed in claim 1 further characterised by a return spring (17) disposed between the sleeve (12) and the cylinder (14).
- A cylinder lock as claimed in claim 1 or 2 further characterised by a first return spring (17) disposed between the sleeve and the cylinder; and a second return spring (34) disposed between the casing and the connector.
- A cylinder lock as claimed in claim 1, 2 or 3, characterised in that the connector (18) has a cylindrical portion (19) extending outwardly of the sleeve (12) and rotatable relative to the sleeve.
- A cylinder lock as claimed in claim 4, characterised in that the cylindrical portion has a resilient member (20, 21) provided thereon for resiliently urging the pin (16) inwardly.
- A cylinder lock as claimed in any one of claims 1 to 5, characterised in that a pair of pins (16) are disposed radially slidably in corresponding openings (12b) provided in the sleeve (12).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP330273/90 | 1990-11-30 | ||
JP2330273A JP3017276B2 (en) | 1990-11-30 | 1990-11-30 | Cylinder lock |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0488787A1 EP0488787A1 (en) | 1992-06-03 |
EP0488787B1 true EP0488787B1 (en) | 1994-10-05 |
Family
ID=18230807
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19910311119 Expired - Lifetime EP0488787B1 (en) | 1990-11-30 | 1991-11-29 | Cylinder lock |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0488787B1 (en) |
JP (1) | JP3017276B2 (en) |
CA (1) | CA2056461C (en) |
DE (2) | DE488787T1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9205835U1 (en) * | 1992-05-04 | 1992-07-30 | Niemann, Hans Dieter, 5014 Kerpen, De | |
EP0650874B1 (en) * | 1993-02-26 | 2000-07-12 | Alpha Corporation | Steering lock device |
US5640864A (en) * | 1993-12-27 | 1997-06-24 | Alpha Corporation | Cylinder lock resistible against breaking |
FR2766512A1 (en) * | 1997-07-28 | 1999-01-29 | Euro Locks | Cam lock |
ES2168905B1 (en) * | 1999-07-07 | 2003-11-01 | Valeo Sist S De Seguridad S A | LOCK, ESPECIALLY FOR VEHICLE DOOR, WITH RETURN SPRING OF THE OPENING LEVER. |
JP5005459B2 (en) * | 2007-07-30 | 2012-08-22 | 株式会社東海理化電機製作所 | Cylinder lock and unlocking device having the same |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2550817B1 (en) * | 1983-08-17 | 1988-01-08 | Guitard Robert | LOCK WITH SAFETY BLOCK AND FIXING RING |
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1990
- 1990-11-30 JP JP2330273A patent/JP3017276B2/en not_active Expired - Fee Related
-
1991
- 1991-11-28 CA CA 2056461 patent/CA2056461C/en not_active Expired - Fee Related
- 1991-11-29 DE DE1991311119 patent/DE488787T1/en active Pending
- 1991-11-29 EP EP19910311119 patent/EP0488787B1/en not_active Expired - Lifetime
- 1991-11-29 DE DE1991604465 patent/DE69104465T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH04203084A (en) | 1992-07-23 |
JP3017276B2 (en) | 2000-03-06 |
EP0488787A1 (en) | 1992-06-03 |
DE488787T1 (en) | 1992-11-05 |
CA2056461A1 (en) | 1992-05-31 |
DE69104465D1 (en) | 1994-11-10 |
DE69104465T2 (en) | 1995-03-02 |
CA2056461C (en) | 1997-04-29 |
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