CA1326374C - Control key extension adapter - Google Patents
Control key extension adapterInfo
- Publication number
- CA1326374C CA1326374C CA000595230A CA595230A CA1326374C CA 1326374 C CA1326374 C CA 1326374C CA 000595230 A CA000595230 A CA 000595230A CA 595230 A CA595230 A CA 595230A CA 1326374 C CA1326374 C CA 1326374C
- Authority
- CA
- Canada
- Prior art keywords
- extension member
- operating key
- key
- bitted
- extension
- 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 - Fee Related
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B19/00—Keys; Accessories therefor
- E05B19/18—Keys adjustable before use
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B9/00—Lock casings or latch-mechanism casings ; Fastening locks or fasteners or parts thereof to the wing
- E05B9/08—Fastening locks or fasteners or parts thereof, e.g. the casings of latch-bolt locks or cylinder locks to the wing
- E05B9/084—Fastening of lock cylinders, plugs or cores
- E05B9/086—Fastening of rotors, plugs or cores to an outer stator
Abstract
A B S T R A C T
A bitted substantially rigid extension adapter is provided which may be applied to an existing operating key thereby forming a control key assembly. The extension adapter is provided with fasteners for secure attachment to an operating key. The extension adapter may be made of metal.
The bitted portion of the adapter may activate on or more control tumblers in a removable locking core housed within a locking mechanism. The adapter and key, when combined, may be used to remove the locking core from the mechanism.
A bitted substantially rigid extension adapter is provided which may be applied to an existing operating key thereby forming a control key assembly. The extension adapter is provided with fasteners for secure attachment to an operating key. The extension adapter may be made of metal.
The bitted portion of the adapter may activate on or more control tumblers in a removable locking core housed within a locking mechanism. The adapter and key, when combined, may be used to remove the locking core from the mechanism.
Description
132637~
SPECIFICATION
This invention relates to locking mechanisms and in particular, the~keys used to operate locking cores housed within locking mechanisms.
It is common for locking systems to provide separate operating keys and control keys for use with rotatable locking cores. An operating key is employed to lock and unlock a corresponding core when the core is housed in the locking mechanism. For esample, if a locking mechanism is installed to secure a desk drawer against openinq when locked, the operating key may be used to lock and unlock the core, thereby in turn, permitting the secure closure and opening, respectively, of the drawer.
A control key may be used for additional functions including, acting as a master key to operate a number of different locking cores or as a key to permit removal of a locking core from its corresponding housing. Typically, a control key i~ provided with a bitted portion which is capable of activating one or more control tumblers in a locking core.
When such control tumblers are activated, usually upon ' ,: , ' : '' r ~32637~
insertion and rotation of the control key to a predetermined position, removal of the locking core from the housing may be achieved. Alternately, where a control key functions as a master key, the bitted portion of the control key is adapted to activate the tumblers in a number of different locking cores which use separate operating keys.
In locking systems of the prior art, the manufacture and use of separate operating keys and master keys gave rise to inherent disadvantages. According to the present invention, a device is provided which may be secured to a preexisting operating key in order to convert the operating key to a control key. The adapter may be manufactured according to a common design for securement to operating keys intended to operate different locks thereby reducing costs. Replacement of lost control keys may be simplified in many cases. An improved method for manufacturing control keys and adapters is also provided. Other advantages of the present invention will become apparent upon a reading of the following disclosure.
Drawings are appended hereto which illustrate embodiments of the present invention. In the drawings, Fiqure 1 i8 an exploded view of a locking mechanism in perspective comprising a locking core and a housing;
;. ~
13~6374 Figure lA is a sectional view along line 5-5 in Figure 1, showing a locking core activated by an operating key and a control key, Figure 2 is a plan view of one embodiment of the present L i nvention;
Figure 3 is an elevation of this embodiment;
Figure 4 is a section of the line A-A in Fiqure 2;
Figure 5 is a plan view of another embodiment of the present invention; and Figure 6 is a plan view of yet another embodiment of the invention.
With reference to Figures 1 and lA, a typical locking core assembly 60 and a lock housing 70 are shown. The core 60 is received in chamber 74 of the housing. Operating tumblers 61 are received in channel 75. When the operatin~ tumblers are extended into the channel 75, the locking core will not rotate within the housing. When operating key 63 with its bitted portion 100 is inserted into the keyway 50, tumblers 61 are retracted and the locking core may be rotated. Upon rotation of the core, pin 60a will displace a spring loaded locking bar assembly 80 to unlock a storage compartment or other lockable device. Control tumblers 62 are engaged with channel 76 in the housing when the control tumblers are extended. When a control , .~
key is inserted having an extended bitted portion 200, control tumblers 62 and operating tumblers 61 are all retracted thereby permitting removal of the entire locking core 60 from the housing 70.
., .
It is to be understood that the foregoing embodiment of a locking core assembly is only one example of a number of different types of locking systems to which the present invention may be applied. For example multiple or single control pins or tumblers may be provided in the locking core.
Alternately, the operating and control tumblers may be situated in the housing æuch that shear pins housed within the locking core may be displaced by the bitted portion of the appropriate key to form a shear line permitting rotation or withdrawl of the core, as the case may be. All of these variations are readily understood in the prior art.
Figures 2, 3 and 4 show an embodiment of a control key estension adapter 200a of the present invention. The adapter has a body 201 which is integrally connected to a bitted portion 202 by means of rigid intermediate shaft 204. The bitted portion 202 or nose-piece includes a raised rib 208 having an edge 210.
Bitted section lOOa (shown in dashed lines) represents the bitted shaft of the operating key 100. A sleeve 212 may be stamped, cast, rolled or otherwise incorporated into the extension body adjacent the lever end 214 of the body. The sleeve 212 snugly fits into a corresponding hole 105 in the operating key. Edge 210 together with sleeve 212 define a channel for receiving operating key 100.
Sleeve 212 may be manipulated to secure the extension adapter to the operating key either before or after the operating key is placed into the channel. For esample, sleeve 212 may be pressed to tightly fit the corresponding hole 105.
Added securement features such as crimping of the terminal ends of the sleeve may be provided, if desired.
With reference to the foregoing description, it is to be understood that the control key assembly formed when the control key estension adapter is secured to the operating key acts as a control key. It has been found that in the preferred embodiment, where the estension member i8 made of metal, such as hardened steel, the nominal thickness 's' of the estension body may be as little as approsimately 0.010 inches. The raised rib 208 iB generally of a height which results in a substantially flush surface when the operating key 100 is . ~. . .
,~
: ~ . , : ,., - . :
132~374 seated on the extension body. When the upper surface 207 of the raised rib is substantially even with the corresponding upper surface 107 of the control key, smooth operation of the control key assembly within a keyway (such a keyway 50 in Fig.
1) is enhanced.
Edge 210 of raiæed rib 208 provide a means of securing the bitted portion 202 to the bitted end of the operating key.
In this embodiment the indicated elements act together with the sleeve 212 and hole 105 arrangement to secure the estension member to the operating key. Rib 206 is intended to engage with a corresponding channel in the operating key. It is to be understood that alternate arrangements and embodiments may be provided without departing from the intended scope of the present invention.
Once secure to the operating key rib 206 reduces the tendency of the bitted portion 202 to the flare away from the operating key after repeated use in a locking core. It can be seen that rib 206 provides reinforcement along the shaft 204 of the estension body. In view of the nominal thickness 's' of the adapter body, the difference between the operative thickne8s of the operating key and the control key assembly will be 'x' provided a tight fit exists between the assembly , . ., :
. . . .
~ !
1~2637~
components. It is found that most locking cores will accept control key assemblies which are moderately thicker that the operating key without substantially detracting from efficient operation. Where existing keyway tolerances do not readily allow variations of 0.010 inches, simple adjustments may be made during the subse~uent manufacturing process of the cores or keys thereby permitting such variability.
The control key assembly comprises the operating key 100 and the extension adapter 200a secured together. The combined bitted segments 100a and 202 are capable of activating all corresponding operating tumblers 61 and control tumblers 62. The arrangement and configuration of bitting 202 on the extension adapter may be modified according to the number and type of control tumblers to be activated in a given application.
Operating keys may have one or more grooves running along the key shaft portions. Rib 206 is shown in Figures 2, 3 and 4 for engagement with one such groove in a corresponding operating key. Where more than one such groove is provided in an operating key, corresponding ribs may be rolled, pressed, stamped or otherwise formed in the extension member shaft to engage with such grooves.
".
.. . ~........ . . . . . ..
. : . - - .;. ~ :... . . .
132~374 Various means may be employed to secure the e~tension adapter to an operating key. In Figure 5, an alternate embodiment of the securement means is shown. A hole 213 is provided in the extension body 201 having a diameter substantially equal to the size of the hole 105 in a corresponding control key. Holes 213 and 105 are intended to permit placement of the key assembly on a key chain or key ring when in use. A flange portion 219 is provided at the lever end of the body. The flange 219 e~tends beyond the terminal edge 101 of the operating key by a distance equal to the combined widths of flange segment 230 and flange segment 220.
It can be understood that the width of flange 230 may be selected to correspond to the thickness of the operating key at its lever end. The flange segments may then be bent, rolled or otherwise shaped to clamp around the terminal end 101 of the operating key.
Although only one outline of an operating key is shown in Figure 2, operating keys having different bitted segments may be utilized with one standardized extension body. The width 'w' of the shaft portion 204 may be selected to be 8ufficiently narrow to avoid interference with the bitting on a range of operating keys. The length and configuration of such operating keys must be suitable to permit the securement means ..
. . ~ , .
-132~37~
g to interact to secure the extension adapter to the various operating keys.
In another embodiment, the edge 210 of raised rib 208 may provide an indent or channel running substantially along the length of the edge 210. This channel may be adapted to more securely receive the corresponding terminal end of the operating key. Although the foregoing embodiments show a bitted portion or nose-piece 202 having a solid rib 208, other embodiments may be used. For example, as shown in Figure 6, the nose-piece 202 may comprise a raised rib 215 which extendæ
around the outer periperhery of the nose-piece. Ends 216 of the rib are shown to abut against terminal edge 209 of the operating key. The height of the rib 215 may be selected to provide for flush engagement with the upper surface of the operating key. Where the outer edge 209 of the operating key is rounded or otherwise shaped, a corresponding channel may be provided at ends 216 of the rib 215 to enhance positive engagement between corresponding ends of the key and extension body.
Rib 215 may be formed from a material stock of uniform thickness if such stock is used to make the adapter body.
Whereas a collar or sleeve may be stamped, pressed or otherwise formed at the lever end of the adapter body, rib 215 may also .: . . . , ~ , . .
- . . -~ ... , ~
1326~7~
be stamped, pressed or otherwise formed at the bitted end of the adapter body. It is therefore understood that an inexpensive ada~ter may be provided in this manner. Further useful modifications of the adapter described herein will occur to those s~illed in the art and such modifications are intended to be covered by the following claims.
4382b/3-12 .
SPECIFICATION
This invention relates to locking mechanisms and in particular, the~keys used to operate locking cores housed within locking mechanisms.
It is common for locking systems to provide separate operating keys and control keys for use with rotatable locking cores. An operating key is employed to lock and unlock a corresponding core when the core is housed in the locking mechanism. For esample, if a locking mechanism is installed to secure a desk drawer against openinq when locked, the operating key may be used to lock and unlock the core, thereby in turn, permitting the secure closure and opening, respectively, of the drawer.
A control key may be used for additional functions including, acting as a master key to operate a number of different locking cores or as a key to permit removal of a locking core from its corresponding housing. Typically, a control key i~ provided with a bitted portion which is capable of activating one or more control tumblers in a locking core.
When such control tumblers are activated, usually upon ' ,: , ' : '' r ~32637~
insertion and rotation of the control key to a predetermined position, removal of the locking core from the housing may be achieved. Alternately, where a control key functions as a master key, the bitted portion of the control key is adapted to activate the tumblers in a number of different locking cores which use separate operating keys.
In locking systems of the prior art, the manufacture and use of separate operating keys and master keys gave rise to inherent disadvantages. According to the present invention, a device is provided which may be secured to a preexisting operating key in order to convert the operating key to a control key. The adapter may be manufactured according to a common design for securement to operating keys intended to operate different locks thereby reducing costs. Replacement of lost control keys may be simplified in many cases. An improved method for manufacturing control keys and adapters is also provided. Other advantages of the present invention will become apparent upon a reading of the following disclosure.
Drawings are appended hereto which illustrate embodiments of the present invention. In the drawings, Fiqure 1 i8 an exploded view of a locking mechanism in perspective comprising a locking core and a housing;
;. ~
13~6374 Figure lA is a sectional view along line 5-5 in Figure 1, showing a locking core activated by an operating key and a control key, Figure 2 is a plan view of one embodiment of the present L i nvention;
Figure 3 is an elevation of this embodiment;
Figure 4 is a section of the line A-A in Fiqure 2;
Figure 5 is a plan view of another embodiment of the present invention; and Figure 6 is a plan view of yet another embodiment of the invention.
With reference to Figures 1 and lA, a typical locking core assembly 60 and a lock housing 70 are shown. The core 60 is received in chamber 74 of the housing. Operating tumblers 61 are received in channel 75. When the operatin~ tumblers are extended into the channel 75, the locking core will not rotate within the housing. When operating key 63 with its bitted portion 100 is inserted into the keyway 50, tumblers 61 are retracted and the locking core may be rotated. Upon rotation of the core, pin 60a will displace a spring loaded locking bar assembly 80 to unlock a storage compartment or other lockable device. Control tumblers 62 are engaged with channel 76 in the housing when the control tumblers are extended. When a control , .~
key is inserted having an extended bitted portion 200, control tumblers 62 and operating tumblers 61 are all retracted thereby permitting removal of the entire locking core 60 from the housing 70.
., .
It is to be understood that the foregoing embodiment of a locking core assembly is only one example of a number of different types of locking systems to which the present invention may be applied. For example multiple or single control pins or tumblers may be provided in the locking core.
Alternately, the operating and control tumblers may be situated in the housing æuch that shear pins housed within the locking core may be displaced by the bitted portion of the appropriate key to form a shear line permitting rotation or withdrawl of the core, as the case may be. All of these variations are readily understood in the prior art.
Figures 2, 3 and 4 show an embodiment of a control key estension adapter 200a of the present invention. The adapter has a body 201 which is integrally connected to a bitted portion 202 by means of rigid intermediate shaft 204. The bitted portion 202 or nose-piece includes a raised rib 208 having an edge 210.
Bitted section lOOa (shown in dashed lines) represents the bitted shaft of the operating key 100. A sleeve 212 may be stamped, cast, rolled or otherwise incorporated into the extension body adjacent the lever end 214 of the body. The sleeve 212 snugly fits into a corresponding hole 105 in the operating key. Edge 210 together with sleeve 212 define a channel for receiving operating key 100.
Sleeve 212 may be manipulated to secure the extension adapter to the operating key either before or after the operating key is placed into the channel. For esample, sleeve 212 may be pressed to tightly fit the corresponding hole 105.
Added securement features such as crimping of the terminal ends of the sleeve may be provided, if desired.
With reference to the foregoing description, it is to be understood that the control key assembly formed when the control key estension adapter is secured to the operating key acts as a control key. It has been found that in the preferred embodiment, where the estension member i8 made of metal, such as hardened steel, the nominal thickness 's' of the estension body may be as little as approsimately 0.010 inches. The raised rib 208 iB generally of a height which results in a substantially flush surface when the operating key 100 is . ~. . .
,~
: ~ . , : ,., - . :
132~374 seated on the extension body. When the upper surface 207 of the raised rib is substantially even with the corresponding upper surface 107 of the control key, smooth operation of the control key assembly within a keyway (such a keyway 50 in Fig.
1) is enhanced.
Edge 210 of raiæed rib 208 provide a means of securing the bitted portion 202 to the bitted end of the operating key.
In this embodiment the indicated elements act together with the sleeve 212 and hole 105 arrangement to secure the estension member to the operating key. Rib 206 is intended to engage with a corresponding channel in the operating key. It is to be understood that alternate arrangements and embodiments may be provided without departing from the intended scope of the present invention.
Once secure to the operating key rib 206 reduces the tendency of the bitted portion 202 to the flare away from the operating key after repeated use in a locking core. It can be seen that rib 206 provides reinforcement along the shaft 204 of the estension body. In view of the nominal thickness 's' of the adapter body, the difference between the operative thickne8s of the operating key and the control key assembly will be 'x' provided a tight fit exists between the assembly , . ., :
. . . .
~ !
1~2637~
components. It is found that most locking cores will accept control key assemblies which are moderately thicker that the operating key without substantially detracting from efficient operation. Where existing keyway tolerances do not readily allow variations of 0.010 inches, simple adjustments may be made during the subse~uent manufacturing process of the cores or keys thereby permitting such variability.
The control key assembly comprises the operating key 100 and the extension adapter 200a secured together. The combined bitted segments 100a and 202 are capable of activating all corresponding operating tumblers 61 and control tumblers 62. The arrangement and configuration of bitting 202 on the extension adapter may be modified according to the number and type of control tumblers to be activated in a given application.
Operating keys may have one or more grooves running along the key shaft portions. Rib 206 is shown in Figures 2, 3 and 4 for engagement with one such groove in a corresponding operating key. Where more than one such groove is provided in an operating key, corresponding ribs may be rolled, pressed, stamped or otherwise formed in the extension member shaft to engage with such grooves.
".
.. . ~........ . . . . . ..
. : . - - .;. ~ :... . . .
132~374 Various means may be employed to secure the e~tension adapter to an operating key. In Figure 5, an alternate embodiment of the securement means is shown. A hole 213 is provided in the extension body 201 having a diameter substantially equal to the size of the hole 105 in a corresponding control key. Holes 213 and 105 are intended to permit placement of the key assembly on a key chain or key ring when in use. A flange portion 219 is provided at the lever end of the body. The flange 219 e~tends beyond the terminal edge 101 of the operating key by a distance equal to the combined widths of flange segment 230 and flange segment 220.
It can be understood that the width of flange 230 may be selected to correspond to the thickness of the operating key at its lever end. The flange segments may then be bent, rolled or otherwise shaped to clamp around the terminal end 101 of the operating key.
Although only one outline of an operating key is shown in Figure 2, operating keys having different bitted segments may be utilized with one standardized extension body. The width 'w' of the shaft portion 204 may be selected to be 8ufficiently narrow to avoid interference with the bitting on a range of operating keys. The length and configuration of such operating keys must be suitable to permit the securement means ..
. . ~ , .
-132~37~
g to interact to secure the extension adapter to the various operating keys.
In another embodiment, the edge 210 of raised rib 208 may provide an indent or channel running substantially along the length of the edge 210. This channel may be adapted to more securely receive the corresponding terminal end of the operating key. Although the foregoing embodiments show a bitted portion or nose-piece 202 having a solid rib 208, other embodiments may be used. For example, as shown in Figure 6, the nose-piece 202 may comprise a raised rib 215 which extendæ
around the outer periperhery of the nose-piece. Ends 216 of the rib are shown to abut against terminal edge 209 of the operating key. The height of the rib 215 may be selected to provide for flush engagement with the upper surface of the operating key. Where the outer edge 209 of the operating key is rounded or otherwise shaped, a corresponding channel may be provided at ends 216 of the rib 215 to enhance positive engagement between corresponding ends of the key and extension body.
Rib 215 may be formed from a material stock of uniform thickness if such stock is used to make the adapter body.
Whereas a collar or sleeve may be stamped, pressed or otherwise formed at the lever end of the adapter body, rib 215 may also .: . . . , ~ , . .
- . . -~ ... , ~
1326~7~
be stamped, pressed or otherwise formed at the bitted end of the adapter body. It is therefore understood that an inexpensive ada~ter may be provided in this manner. Further useful modifications of the adapter described herein will occur to those s~illed in the art and such modifications are intended to be covered by the following claims.
4382b/3-12 .
Claims (14)
1. A control key extension member for use in association with an operating key said operating key comprising lever means at one end, a bitted end adapted for insertion into a keyway to permit activation of tumblers in a lock, and a shaft connecting said two ends, said extension member comprising:
(a) a body member supporting a bitted portion for activation of at least one control tumbler in said lock, and (b) means connected to said body member and adapted for securing said extension member to said operating key.
(a) a body member supporting a bitted portion for activation of at least one control tumbler in said lock, and (b) means connected to said body member and adapted for securing said extension member to said operating key.
2. In an extension member as claimed in claim 1, the body member defining a channel to receive said operating key, said extension member being sufficiently thin, such that when said extension member is secured to said operating key, travel into said keyway is not obstructed.
3. In an extension member as claimed in claim 2, the bitted portion being adapted to abut in securement with the bitted end of said operating key.
4. In an extension member as claimed in claim 3, the securement means comprising a flange member connected to said bitted portion.
5. In an extension member as claimed in claim 3, the securement means comprising a raised edge on said bitted portion defining a channel for receiving the bitted end of said key.
6. In an extension member as claimed in claim 5, the securement means further comprising a flange adapted to be shaped for engagement adjacent the lever end of said operating key.
7. In an extension member as claimed in claim 6, wherein said flange is rigidly hinged to said body member.
8. An extension member as claimed in claim 7 made of metal.
9. A control key extension comprising:
(a) a substantially rigid body defining a channel to receive an operating key;
(b) a bitted portion at one end of said body adapted to activate at least one control tumbler in a locking core;
(c) first attachment means adjacent the bitted portion adapted to secure the bitted end of an operating key to said body; and (d) second attachment means adjacent the other end of said body to securely receive the other end of an operating key, said control key extension, when secured to an operating key, being adapted to enter into a corresponding keyway in a locking core housed in a locking mechanism, wherein, upon activation of said at least one control tumbler, said locking core may be removed from said locking mechanism.
(a) a substantially rigid body defining a channel to receive an operating key;
(b) a bitted portion at one end of said body adapted to activate at least one control tumbler in a locking core;
(c) first attachment means adjacent the bitted portion adapted to secure the bitted end of an operating key to said body; and (d) second attachment means adjacent the other end of said body to securely receive the other end of an operating key, said control key extension, when secured to an operating key, being adapted to enter into a corresponding keyway in a locking core housed in a locking mechanism, wherein, upon activation of said at least one control tumbler, said locking core may be removed from said locking mechanism.
10. In an extension member as claimed in claim 9, the first attachment means comprising a raised flange portion defining a groove in said bitted portion.
11. In an extension member as claimed in claim 10, the second attachment means comprising a substantially rigid raised portion adapted for snapping securement with the other end of an operating key.
12. In an extension member as claimed in claim 10, the second attachment means comprising a substantially rigid second flange portion adapted for bendable engagement with the other end of an operating key.
13 13. An extension member as claimed in claim 12 made of metal.
14. In an extension member as claimed in claim 13, the bitted portion being adapted to define a substantially uniform thickness when the extension member is secured to an operating key.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000595230A CA1326374C (en) | 1989-03-30 | 1989-03-30 | Control key extension adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000595230A CA1326374C (en) | 1989-03-30 | 1989-03-30 | Control key extension adapter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1326374C true CA1326374C (en) | 1994-01-25 |
Family
ID=4139826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000595230A Expired - Fee Related CA1326374C (en) | 1989-03-30 | 1989-03-30 | Control key extension adapter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1326374C (en) |
-
1989
- 1989-03-30 CA CA000595230A patent/CA1326374C/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |