CA1135522A - Locking mechanism - Google Patents
Locking mechanismInfo
- Publication number
- CA1135522A CA1135522A CA000361245A CA361245A CA1135522A CA 1135522 A CA1135522 A CA 1135522A CA 000361245 A CA000361245 A CA 000361245A CA 361245 A CA361245 A CA 361245A CA 1135522 A CA1135522 A CA 1135522A
- Authority
- CA
- Canada
- Prior art keywords
- key
- rib members
- lock
- keys
- pins
- 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
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- Lock And Its Accessories (AREA)
Abstract
Abstract A flat key has laterally projecting ribs which extend along the key and which are adapted to enter slots in the key hole of a lock. The slots communicate with bores which receive locking pins which are pushed outwardly when engaged by the ribs. When not engaged by ribs of correct height or in the absence of ribs the locking pins are not pushed out to the extremities of the bores, thus leaving recesses into which a housing pin falls to prevent rotation of the central cylindrical part of the lock. According to the invention two additional ribs are provided which are provided with spaced discontinuities or depressions. The lock is provided with security pins in addition to the locking pins and these security pins are intended to be received in the discontinuities or depressions of the key. When the correct key is inserted the locking pins are pushed outwardly as before and the security pins are urged inwardly out of engagement with locking recesses provided in the housing. This permits rotation of the central cylinder.
With the wrong key or if a tool is used to manipulate the lock, one or more of security pins is pushed outwardly into locking engagement with the housing thus preventing rotation even if all of the locking pins are successfully released.
With the wrong key or if a tool is used to manipulate the lock, one or more of security pins is pushed outwardly into locking engagement with the housing thus preventing rotation even if all of the locking pins are successfully released.
Description
11;~55ZZ:
Ihc invention rclates to a locking mechanism of the type consist-ing of a rotary cylinder having laterally extending bores receiving locking elements.
The locking elements sense the thickness of the profile of a flat key and, with the correct profile, the locking elements are urged outwardly so far that their outer ends align themselves with the surface of the cylin-der, whereas if a thinner key profile is present or no key is present, the locking elements leave unfilled spaces in their bores at the cylinder periphery into which, after initial rotation of the cylinder, a housing pin can drop and so lock the cylinder against further rotation.
The correct key profile is obtained in the primary key by ribs rising above the basic flat profile, the ribs being adapted to urge the said locking elements into the cylinder-release position. A secondary form of the same key can be provided in which one of the ribs is absent and a deep indexing notch is provided.
A core pin is received in a radial bore in the cylinder and this core pin has a smaller diameter upper part and a shank which has a diameter equal to the distance across the lateral ribs. The housing pin normally is aligned with and urges the core pin inwardly along its radial bore. The radial bore communicates with one or more bores in which the locking pins are received. When the primary key is used the core pin plays no part in releasing the locking pins but when the secondary key is used the shank of the core pin engages the or each locking pin which would have been released by the lowermost rib or ribs of the primary key, thus to release that locking pin.
The aforesaid lock provides a locking mechanism of which the primary , 11;~552Z
key is made largely uncopiable. [n order to produce such a key, from a secon-dary key, for example, it would be necessary, in contrast to the usual method of copying keys by removing material from a blank, to apply material in order to fill up the deep notch in the secondary key in the direction of a flat notch, and in order to form profiled lateral ribs.
The uncopiability of profiled flat keys is already the subject of German Patent 20 59 523 (Zeiss Ikon AG, dated May 12, 1977), of which the main inventive concept is to be perceived in that at least one additional longitudinal rib projecting beyond the lateral surface of the flat key is provided, by means of which an additional locking part is actuated. The lock can be actuated if the additional longitudinal rib is of a predetermined height, thus completely filling its cylinder-core-bore and any preceding depression, and preventing the relevant housing pin from snapping, after initial rotation of the cylinder core, into the bearing bore of the locking pin of the depression, thus making further rotation of the cylinder core impossible.
According to another characteristic of the locking mechanism dis-closed in German Patent 20 59 523, two additional longitudinal ribs are pro-vided. These project from the flat-key lateral surfaces facing each other and each is sensed by an additional locking pin. ~.
The advantage of this key is it is uncopiable, since producing it from a commerical key blank would require the addition of material in order to form the additional longitudinal ribs projecting from the profile of the key.
As already indicated, this is a departure from the usual method of copying keys by removing material, and is scarcely possible for an unauthorized key-copier.
In order to make the locking mechanism according to German Patent
Ihc invention rclates to a locking mechanism of the type consist-ing of a rotary cylinder having laterally extending bores receiving locking elements.
The locking elements sense the thickness of the profile of a flat key and, with the correct profile, the locking elements are urged outwardly so far that their outer ends align themselves with the surface of the cylin-der, whereas if a thinner key profile is present or no key is present, the locking elements leave unfilled spaces in their bores at the cylinder periphery into which, after initial rotation of the cylinder, a housing pin can drop and so lock the cylinder against further rotation.
The correct key profile is obtained in the primary key by ribs rising above the basic flat profile, the ribs being adapted to urge the said locking elements into the cylinder-release position. A secondary form of the same key can be provided in which one of the ribs is absent and a deep indexing notch is provided.
A core pin is received in a radial bore in the cylinder and this core pin has a smaller diameter upper part and a shank which has a diameter equal to the distance across the lateral ribs. The housing pin normally is aligned with and urges the core pin inwardly along its radial bore. The radial bore communicates with one or more bores in which the locking pins are received. When the primary key is used the core pin plays no part in releasing the locking pins but when the secondary key is used the shank of the core pin engages the or each locking pin which would have been released by the lowermost rib or ribs of the primary key, thus to release that locking pin.
The aforesaid lock provides a locking mechanism of which the primary , 11;~552Z
key is made largely uncopiable. [n order to produce such a key, from a secon-dary key, for example, it would be necessary, in contrast to the usual method of copying keys by removing material from a blank, to apply material in order to fill up the deep notch in the secondary key in the direction of a flat notch, and in order to form profiled lateral ribs.
The uncopiability of profiled flat keys is already the subject of German Patent 20 59 523 (Zeiss Ikon AG, dated May 12, 1977), of which the main inventive concept is to be perceived in that at least one additional longitudinal rib projecting beyond the lateral surface of the flat key is provided, by means of which an additional locking part is actuated. The lock can be actuated if the additional longitudinal rib is of a predetermined height, thus completely filling its cylinder-core-bore and any preceding depression, and preventing the relevant housing pin from snapping, after initial rotation of the cylinder core, into the bearing bore of the locking pin of the depression, thus making further rotation of the cylinder core impossible.
According to another characteristic of the locking mechanism dis-closed in German Patent 20 59 523, two additional longitudinal ribs are pro-vided. These project from the flat-key lateral surfaces facing each other and each is sensed by an additional locking pin. ~.
The advantage of this key is it is uncopiable, since producing it from a commerical key blank would require the addition of material in order to form the additional longitudinal ribs projecting from the profile of the key.
As already indicated, this is a departure from the usual method of copying keys by removing material, and is scarcely possible for an unauthorized key-copier.
In order to make the locking mechanism according to German Patent
- 2 -11;~5~
20 59 523, which uses the uncopiable key, alC;o proof against tampering, in other words, to prevcnt the additional locking pins which sense the additional longitudinal ribs from being rendered ineffective by manipulation, German Patent 24 11 362 (Zeiss Ikon A.G. dated June 28~ 1979) proposes a locking mechanism in the form of a rotary cylinder lock associated with a flat key.
This is based upon the fact one-piece additional locking pins are arranged in the cylinder-core of the lock and that at least one additional longitudinal rib is provided, which is sensed by the additional locking pins. If the flat key fits, the additional locking pins lie with the end facing away from the key-channel, in the joint between the cylinder-core and the cylinder housing, and prevent the said cylinder core from being rotated any further after an initial rotation. The main inventive concept consists in that security-locking-pins are arranged in front of the said additional locking pins - as seen from the front of the key, which sense the recesses in the additional longitudinal ribs and are provided with recesses, grooves, or the like in the cylinder housing into which the said safety-locking pins enter upon assuming their locking position.
The security against manipulation achieved with this locking mechanism is based mainly upon the fact that the security-pins preceding the additional locking pins prevent manipulation of the latter, i.e. the locking pins can no longer be forced outwardly by means of a tool, for example. It is also based upon the fact that any outward displacement of the security pins, brought about by a tool or the like, causes these pins to enter into the bores in their housing, resulting in immediate locking of the cylinder-core against rotation.
In the case of the lock mentioned at the beginning of the disclosure, and that disclosed in German Patent 20 59 523, the keys are rendered virtually 1135SZ2:
copy-proof because material must be added in order to copy the key. In the case of German Patent 24 11 362, security of the lock against manipulation is achieved because security-pins precede the locking pins which sense the additional longitudinal rib. The latter consists of a series of projections and depressions, being thus modulated in height.
It is the object of the present invention to make use of the advantages of the prior art to provide a lock for a locking mechanism which, while using only a small amount of material, ensures a larger number of possible combinations and a very considerable increase in security against manipulation.
According to one aspect, the invention is in a key for use in a hierarchal lock system with an elongated body having selectively spaced notches cut on an elongated edge thereof, an improvement comprising a first plurality of discontinuous rib members selectively arranged and affixed to a side of the body wherein higher order keys in the hierarchy have more discontinuous rib members than do lower order keys.
The invention will now be described in greater detail, with reference to the accompanying drawings, in which:
Figure 1 is a cross-sectional view of a locking mechanism;
Figure 2 is a cross-sectional view similar to Figure 1 but showing the use of a secondary rather than a primary key;
Figure 3 is a fragmentary longitudinal sectional view of the lock-ing mechanism showing the use of security pins;
Figure 4 is a perspective view showing part of a key according to the present invention; and f~
11~5S~Z
Figure 5 is a view similar to Figure 3 showing the locking mechanism of the present invention.
Based upon the lock regarded as the starting point of the inven-tion, in Figure 1 the cylindcr-core is marked 1 and the housing of the lock is marked 2. A main key 4 is shown introduced into key-channel 3. The key 4 has a profile comprising preferably rectangular grooves and profiled ribs 12, 13, 17, 18 on both of the flat sides. These ribs are sensed by lock-ing elements 7, 8, 21, 22 located in cylinder-bores 5, 6, 123, 124 which run out into depressions 24, 25, 26, 27 into which a housing-pin 15 can drop after slight rotation of the cylinder-core, as long as depressions 24, 25, 26, 27 are not filled by locking elements 7, 8 and 21, 22. Locking elements 7, 8 have sensing ends 7a, 8a which are machined smaller. Core-pin 10, co-operating with indexing-notch 11 in main key 4 at the sensing point of locking pins 7, 8, and mounted in cylinder-core bore 9, has a constricted neck-part lOa with a point lOb adapted to drop into the indexing notch when this is presented thereto.
Profiled ribs 12, 13, 17, 18 rise above the profile of the key and project laterally in such a manner as to urge locking pins 7, 8, 21, 22 so far outwardly that the outer ends thereof come into contact with the surface of cylinder 19, thus preventing, after initial rotation of the cylinder-core, housing pin 15 associated therewith from dropping into one of depressions 24 to 27.
Located between core-pin 10 and housing-pin 15 is a small plate 16, the purpose of which will be explained in greater detail in conjunction with Figure 2.
In Figure 2 the lock is shown with a secondary key 4a inserted into the key channel. At the sensing point of locking pins 7, 8 the said key has a deep indexing notch 14 which allows core-pin 10 to rise considerably higher than was the case with flat notch 11 of primary key 4 (Figure 1). Core-pin lO is under the action of a compression spring, not shown, but acting in known fashion upon housing-pin 15.
Since pin-combination 10, 15 rises to a greater height, the full diameter of core-pin 10 reaches the vicinity of locking pins 7, 8. It should be noted that the indexing function performed by profiled ribs 12, 13, in relation to locking pins 7, 8, is taken over by the shank of raised core-pin 10. Since the diameter thereof corresponds to the thickness of the profiled ribs, it urges locking pins 7, 8, which are sensing it, outward against housing 19.
Plate 16 ensures that housing pin 15 does not drop into bore 9.
A locking mechanism, built up with locks and keys of the type de-scribed above has the advantage that the keys are very largely proof against copying. For instance, in the case of key 4a, material would have to be added at deep indexing notch 14 in order to produce primary key 4 in Figure 1 from the said secondary key, at which point the said primary key has a flat indexing notch 11 and lateral profiled ribs 12, 13.
In addition to this, the lock is manipulation-proof, as shown in the example of embodiment according to Figure 3. With this design, it is impossible for a tool, or the like, to force the locking pins so far outwardly that they line up with cylinder-surface 19 and prevent the housing-pin located in this plane of the lock from snapping into one of the depressions preceding the locking pin bores as a result of such manipulation.
According to Figure 3, security against manipulation is achieved in that profiled ribs 12, 13 are modulated in height, i.e. they comprise a series of projections and depressions or discontinuities 12, 13, 121, 131 as indicated in Figure 3 which shows a part of the key. As seen from the front of the key, locking pins 7, 8 which sensc projections 12, 13 (normal profiled-rib height), precede security pins 28, 29 which sense depressions 121, 131 and are mounted in cylinder-core-bores 30, 31 facing exit and entry-bores 32, 33 in the housing, when the lock is in the open or closed condition.
When these bores are occupied by pins 28, 29, the lock immediately assumes its locked condition. It is obviously no longer possible to bring about an equalizing position of pins 7, 8 by simulating profiled ribs 12, 13. This is prevented, on the one hand, in that security pins 28, 29 prevent access to locking pins 7, 8 and, on the other hand, in that any attempt to bypass security pins 28, 29 results in immediate locking of the lock.
Based upon this, the invention also proposes to provide the mani-pulation-proof lock, and its very largely copy-proof keys, with substantially greater closure-security and variation-range than has hitherto been possible, in that on at least one flat side of the key there are at least two additional longitudinal ribs co-operating with locking elements which are preceded, as seen from the front of the key, by security pins which sense recesses or dis-continuities in the additional profiled ribs.
The key thus equipped is shown in Figure 4. On the side visible in the drawing, this comprises two profiled ribs which are split up, by de-pressions and discontinuities, into rib-pieces or -cams. As shown by arrows 50, 52, 54, 55, 57 and 59, these pieces or cams 34, 36, 38, 39, 41, 43 are sensed by locking pins which, as regards their mountings in the cylinder-core-bores, fully correspond to the locking pins shown in Figures 1 to 3, whereas depressions 35, 37, 40 and 42 are sensed by security pins, as symboliz-ed by arrows 51, 53, 56 and 58. If this key- and sensing-element-design is assumed to be present on both sides, and if the narrow side of the key is 1~355ZZ
assumed to have five indexing notches with corresponding tumblers, this pro-vides 25 sensing points per lock. This ensures that a locking mechanism based upon these locks use keys which are copy-proof in multiple aspects, especial-ly the main keys, and locks which are manipulation-proof.
Further to Figure 4, Figure 5 is a detailed representation of the profiled-rib parts and discontinuities of the key, and of the sensing elements engaging therewith in a selected plane of the lock.
Security is also increased by the fact that, in a manner known per se, the primary keys have a larger number of profiled ribs than the secon-dary keys, while the main or master key has the largest, or largest possible, number of profiled ribs.
20 59 523, which uses the uncopiable key, alC;o proof against tampering, in other words, to prevcnt the additional locking pins which sense the additional longitudinal ribs from being rendered ineffective by manipulation, German Patent 24 11 362 (Zeiss Ikon A.G. dated June 28~ 1979) proposes a locking mechanism in the form of a rotary cylinder lock associated with a flat key.
This is based upon the fact one-piece additional locking pins are arranged in the cylinder-core of the lock and that at least one additional longitudinal rib is provided, which is sensed by the additional locking pins. If the flat key fits, the additional locking pins lie with the end facing away from the key-channel, in the joint between the cylinder-core and the cylinder housing, and prevent the said cylinder core from being rotated any further after an initial rotation. The main inventive concept consists in that security-locking-pins are arranged in front of the said additional locking pins - as seen from the front of the key, which sense the recesses in the additional longitudinal ribs and are provided with recesses, grooves, or the like in the cylinder housing into which the said safety-locking pins enter upon assuming their locking position.
The security against manipulation achieved with this locking mechanism is based mainly upon the fact that the security-pins preceding the additional locking pins prevent manipulation of the latter, i.e. the locking pins can no longer be forced outwardly by means of a tool, for example. It is also based upon the fact that any outward displacement of the security pins, brought about by a tool or the like, causes these pins to enter into the bores in their housing, resulting in immediate locking of the cylinder-core against rotation.
In the case of the lock mentioned at the beginning of the disclosure, and that disclosed in German Patent 20 59 523, the keys are rendered virtually 1135SZ2:
copy-proof because material must be added in order to copy the key. In the case of German Patent 24 11 362, security of the lock against manipulation is achieved because security-pins precede the locking pins which sense the additional longitudinal rib. The latter consists of a series of projections and depressions, being thus modulated in height.
It is the object of the present invention to make use of the advantages of the prior art to provide a lock for a locking mechanism which, while using only a small amount of material, ensures a larger number of possible combinations and a very considerable increase in security against manipulation.
According to one aspect, the invention is in a key for use in a hierarchal lock system with an elongated body having selectively spaced notches cut on an elongated edge thereof, an improvement comprising a first plurality of discontinuous rib members selectively arranged and affixed to a side of the body wherein higher order keys in the hierarchy have more discontinuous rib members than do lower order keys.
The invention will now be described in greater detail, with reference to the accompanying drawings, in which:
Figure 1 is a cross-sectional view of a locking mechanism;
Figure 2 is a cross-sectional view similar to Figure 1 but showing the use of a secondary rather than a primary key;
Figure 3 is a fragmentary longitudinal sectional view of the lock-ing mechanism showing the use of security pins;
Figure 4 is a perspective view showing part of a key according to the present invention; and f~
11~5S~Z
Figure 5 is a view similar to Figure 3 showing the locking mechanism of the present invention.
Based upon the lock regarded as the starting point of the inven-tion, in Figure 1 the cylindcr-core is marked 1 and the housing of the lock is marked 2. A main key 4 is shown introduced into key-channel 3. The key 4 has a profile comprising preferably rectangular grooves and profiled ribs 12, 13, 17, 18 on both of the flat sides. These ribs are sensed by lock-ing elements 7, 8, 21, 22 located in cylinder-bores 5, 6, 123, 124 which run out into depressions 24, 25, 26, 27 into which a housing-pin 15 can drop after slight rotation of the cylinder-core, as long as depressions 24, 25, 26, 27 are not filled by locking elements 7, 8 and 21, 22. Locking elements 7, 8 have sensing ends 7a, 8a which are machined smaller. Core-pin 10, co-operating with indexing-notch 11 in main key 4 at the sensing point of locking pins 7, 8, and mounted in cylinder-core bore 9, has a constricted neck-part lOa with a point lOb adapted to drop into the indexing notch when this is presented thereto.
Profiled ribs 12, 13, 17, 18 rise above the profile of the key and project laterally in such a manner as to urge locking pins 7, 8, 21, 22 so far outwardly that the outer ends thereof come into contact with the surface of cylinder 19, thus preventing, after initial rotation of the cylinder-core, housing pin 15 associated therewith from dropping into one of depressions 24 to 27.
Located between core-pin 10 and housing-pin 15 is a small plate 16, the purpose of which will be explained in greater detail in conjunction with Figure 2.
In Figure 2 the lock is shown with a secondary key 4a inserted into the key channel. At the sensing point of locking pins 7, 8 the said key has a deep indexing notch 14 which allows core-pin 10 to rise considerably higher than was the case with flat notch 11 of primary key 4 (Figure 1). Core-pin lO is under the action of a compression spring, not shown, but acting in known fashion upon housing-pin 15.
Since pin-combination 10, 15 rises to a greater height, the full diameter of core-pin 10 reaches the vicinity of locking pins 7, 8. It should be noted that the indexing function performed by profiled ribs 12, 13, in relation to locking pins 7, 8, is taken over by the shank of raised core-pin 10. Since the diameter thereof corresponds to the thickness of the profiled ribs, it urges locking pins 7, 8, which are sensing it, outward against housing 19.
Plate 16 ensures that housing pin 15 does not drop into bore 9.
A locking mechanism, built up with locks and keys of the type de-scribed above has the advantage that the keys are very largely proof against copying. For instance, in the case of key 4a, material would have to be added at deep indexing notch 14 in order to produce primary key 4 in Figure 1 from the said secondary key, at which point the said primary key has a flat indexing notch 11 and lateral profiled ribs 12, 13.
In addition to this, the lock is manipulation-proof, as shown in the example of embodiment according to Figure 3. With this design, it is impossible for a tool, or the like, to force the locking pins so far outwardly that they line up with cylinder-surface 19 and prevent the housing-pin located in this plane of the lock from snapping into one of the depressions preceding the locking pin bores as a result of such manipulation.
According to Figure 3, security against manipulation is achieved in that profiled ribs 12, 13 are modulated in height, i.e. they comprise a series of projections and depressions or discontinuities 12, 13, 121, 131 as indicated in Figure 3 which shows a part of the key. As seen from the front of the key, locking pins 7, 8 which sensc projections 12, 13 (normal profiled-rib height), precede security pins 28, 29 which sense depressions 121, 131 and are mounted in cylinder-core-bores 30, 31 facing exit and entry-bores 32, 33 in the housing, when the lock is in the open or closed condition.
When these bores are occupied by pins 28, 29, the lock immediately assumes its locked condition. It is obviously no longer possible to bring about an equalizing position of pins 7, 8 by simulating profiled ribs 12, 13. This is prevented, on the one hand, in that security pins 28, 29 prevent access to locking pins 7, 8 and, on the other hand, in that any attempt to bypass security pins 28, 29 results in immediate locking of the lock.
Based upon this, the invention also proposes to provide the mani-pulation-proof lock, and its very largely copy-proof keys, with substantially greater closure-security and variation-range than has hitherto been possible, in that on at least one flat side of the key there are at least two additional longitudinal ribs co-operating with locking elements which are preceded, as seen from the front of the key, by security pins which sense recesses or dis-continuities in the additional profiled ribs.
The key thus equipped is shown in Figure 4. On the side visible in the drawing, this comprises two profiled ribs which are split up, by de-pressions and discontinuities, into rib-pieces or -cams. As shown by arrows 50, 52, 54, 55, 57 and 59, these pieces or cams 34, 36, 38, 39, 41, 43 are sensed by locking pins which, as regards their mountings in the cylinder-core-bores, fully correspond to the locking pins shown in Figures 1 to 3, whereas depressions 35, 37, 40 and 42 are sensed by security pins, as symboliz-ed by arrows 51, 53, 56 and 58. If this key- and sensing-element-design is assumed to be present on both sides, and if the narrow side of the key is 1~355ZZ
assumed to have five indexing notches with corresponding tumblers, this pro-vides 25 sensing points per lock. This ensures that a locking mechanism based upon these locks use keys which are copy-proof in multiple aspects, especial-ly the main keys, and locks which are manipulation-proof.
Further to Figure 4, Figure 5 is a detailed representation of the profiled-rib parts and discontinuities of the key, and of the sensing elements engaging therewith in a selected plane of the lock.
Security is also increased by the fact that, in a manner known per se, the primary keys have a larger number of profiled ribs than the secon-dary keys, while the main or master key has the largest, or largest possible, number of profiled ribs.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a key for use in a hierarchal lock system with an elongated body having selectively spaced notches cut on an elongated edge thereof, an improvement comprising a first plurality of discontinuous rib members slective-ly arranged and affixed to a side of the body wherein higher order keys in the hierarchy have more discontinuous rib members than do lower order keys.
2. The key according to claim 1 including a second plurality of discontinuous rib members selectively arranged and affixed to an opposite side of the body.
3. In a lock system having a hierarchy of higher order and lower order keys wherein each key has an elongated body, an improvement comprising a plurality of discontinuous rib members selectively attached to the body of each key wherein the higher order keys in the hierarchy have more discontinuous rib members than do the lower order keys.
4. In a key for use in a hierarchal lock system with an elongated body portion, an improvement comprising first and second discontinuous longitudinal ribs attached to a side of the body wherein higher order keys in the hiearchy have more discontinuous rib members than do lower order keys.
5. The improved key according to claim 4, including additionally third and fourth discontinuous longitudinal ribs attached to another side of the body.
6. In a key for use in a hierarchal lock system wherein each lock has a housing with a rotary cylinder mounted within the housing, spring biased radially oriented locking pins and safety pins positioned within the rotary cylinder, the key has an elongated body having selectively spaced notches cut on an elongated edge thereof, an improvement comprising a first plurality of discontinuous rib members selectively arranged and affixed to a side of the body of the key, said rib members are adapted to engage selected safety pins in a lock into which said key is to be inserted to permit said lock to be unlocked provided said notches in said elongated edge simultaneously displace the spring biased locking pins in the lock a selected amount and wherein at least some of said notches, in a lower order key, are deeper than in a higher order key.
7. The key according to claim 6 having further a second plurality of discontinuous rib members selectively arranged and affixed to a second side of the body of the key and wherein higher order keys in the hierarchy have more discontinuous rib members than do lower order keys.
8. The key according to claim 7 including further third and fourth pluralities of discontinuous rib members, said third plurality of discontinuous rib members is selectively arranged and affixed to said side of the key, and said fourth plurality of rib members is selectively arranged and affixed to said second side of the key.
9. A plurality of keys for use in a hierarchal lock system wherein each member of said plurality of keys has a rigid elongated body portion adapted to be inserted into a lock to be unlocked, a first plurality of discontinuous rib members selectively arranged along a first side of said body, a second plurality of discontinuous rib members selectively arranged along a second side of said body, and one or more notches cut into an edge of said body, and wherein, selected ones of said notches are cut deeper into those of said keys adapted to open fewer of the locks, thereby removing adjacent portions of members of said first or second plurality of rib members, than corresponding notches are cut in those of said keys adapted to open more of the locks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000361245A CA1135522A (en) | 1980-09-30 | 1980-09-30 | Locking mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000361245A CA1135522A (en) | 1980-09-30 | 1980-09-30 | Locking mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1135522A true CA1135522A (en) | 1982-11-16 |
Family
ID=4118012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000361245A Expired CA1135522A (en) | 1980-09-30 | 1980-09-30 | Locking mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1135522A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5845525A (en) * | 1993-12-30 | 1998-12-08 | Widen; Bo | Cylinder lock and key combination with a guiding profile ridge in the lock |
-
1980
- 1980-09-30 CA CA000361245A patent/CA1135522A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5845525A (en) * | 1993-12-30 | 1998-12-08 | Widen; Bo | Cylinder lock and key combination with a guiding profile ridge in the lock |
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| EP0139796B1 (en) | Improved tubular lock |
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