CA2047101A1 - Emergency lever handle for narrow stile deadbolt locks - Google Patents
Emergency lever handle for narrow stile deadbolt locksInfo
- Publication number
- CA2047101A1 CA2047101A1 CA 2047101 CA2047101A CA2047101A1 CA 2047101 A1 CA2047101 A1 CA 2047101A1 CA 2047101 CA2047101 CA 2047101 CA 2047101 A CA2047101 A CA 2047101A CA 2047101 A1 CA2047101 A1 CA 2047101A1
- Authority
- CA
- Canada
- Prior art keywords
- rotatably mounted
- mounted cam
- detent
- abutment members
- cam
- 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.)
- Abandoned
Links
- 230000000694 effects Effects 0.000 claims 3
- 238000011144 upstream manufacturing Methods 0.000 claims 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 230000007246 mechanism Effects 0.000 description 2
- 238000009420 retrofitting Methods 0.000 description 2
- 241001164593 Merica Species 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Landscapes
- Lock And Its Accessories (AREA)
Abstract
Abstract The majority of locks used on commercial buildings are of the Bradstock type manufactured by Adams Rite Incorporated. These locks are generally locked from the outside with a key and from the inside with a thumbturn. Because the thumbturn may be difficult to operate in panic conditions where there may be pressure against the door by people trying to get out, a thumbturn is a very undesirable lock and many jurisdtictions in North America have legislated against them and have suggested ninety degree door handles in their place. This invention therefore relates to the provision of a kit of parts that will permit the conversion of such locks from the thumbturn to a ninety degree turn handle for the locking or unlocking of the door from the inside. These conversions do not require the removal of the lock from the door for installing the kit or any modifications of the lock.
Description
2~
~'ield of Invention This invention relates to improvements in door locks, and in particular to the type manufactured and sold by Adams Rite Industries as described in patent #1216317 issued by the Canadian Patent Office to Mr. Todd and Mr. Vulacovic. These locks comprise the largest percentage of the locks used commercially in North ~merica and in many other countries.
Prior Art These locks are made to be universally fitted ,to commercial building doors. They have identical receptacles on the inside and the outside of the door and are usually fitted wi-th key operated cylinders from the outside and by thumbturn cylinders from the inside. The chief difficulty is that thumbturns may be very difficult or impossible to operate in the case of emergency where under panic conditions people may press against the door to get out and this pressure will cause the lock to be difficult to operate particularily because of the small leverage that the thumbturn permits. The result is that in panic conditions where there may be fumes and smoke, people are being locked in buildings that are on fire which results in many fatalities. This has resulted in many jurisdictions enacting laws and regulations requiring that such locks be fitted with a larger, 90 degree turn door handle. Many attempts have been made to design a handle that could be fitted to this type of lock in place of the thumbturn. Two methods have been used in these attempts, neither of which is acceptable.
In the one case the cam is designed to attach to the actuator shaft and to engage the same pins that are now engaged by either the thumbturn or the key operated cylinder. The problem with this is that these pins are not strong enough to accept the increased torque that can be applied by a larger handle. The alternative has been that designers have modified component~ of the lock so that the locXs have to be removed and modified and this is unacceptable to either the regulatory bodies or the manufacturer of the locX.
2 0 ~
The new design here to be described was invented by J. Cowl'ey and R. Bernard of Cowley Technologies Incorporated and was prototyped and -tested on a large variety of locksets and was shown to be adaptable to all of the locks that were tested.
~e therefore believe that this kit of parts is universally adaptable to all of the Bradstock locks. It meets the torque requirements because the operating shaft incorporates a special cam which directly engages the operating lever of the lock which effectively bypasses the low strength pins which are now engaged in the locking or unlocking operatiion in the thumbturn or key operations.
The handle also operates at less than a 90 degrees turn and always unlocks the door on the downward rotation on either right or left hand doors.
Another important feature of this invention is that ,~
the components can be rapidly installed without '~' removing the lock from the door.
The operation of this type of lock fitted with this kit of replacement parts will now be described.
.
With reference to the drawings, Figure 1 i5 an isometric view of the basic Bradstock lock while Figure 2 is a ~ectional view of the same lock showing the lever arm and related components.'Figures 1 and 2 are excerpts from Canadian Patent 1216317. Components 42 etc. are taken from these drawings Figures 1 and 2.
While we consider these excerpts to be sufficient to understand our improvements to the lock functions it would perhaps be preferable if the reader obtained a copy of the Canadian Patent 1216317. Figure 10 is an exploded assembly of the new components. Figure 11 is a front view of the lever arm showing the relation ,' of the new components. In order to ~void confusion thç''~
new components will be numbered starting at 200. '~, The operation is desribed as ollows: ;
Oval protrusion piece 200 is welded to cam 201, and shaft 202 is riveted into cam 201 engaginy splines at 203 and 204 providing torsional strength.
Oval protrus-on piece 200 is welded to cam 201 so that the protrusion piece 200 engages the id.
of hole 48a in lever arm 42. Sleeve 205 is threaded to match the threads internally at 16 in Figure 1 while cylinder 206 fits snugly inside of sleeve 2~5 so that keyway 207 engages an inward protrusion 208 i~ the wall of sleeve 205 while set screw 33 passes through hole 209 to bear on cylinder 206 at 210. Shaft 202 passes snugly through hole 211 in cylinder 206 to attach to handle 212 by engaging a matching splined tapered internal cavity and snugly engage the tapered external spline on shaft 202 at 214 while screw 215 passes into hole 216 in handle 212 to thread into shaft 202 at the internally threaded hole 217. Disc 21~ serves to cover screw 215 to improve the appearance and also to prevent or deter people getting at screw 215. In operation, cam 201 is fitted with a flexible spring blade 220 which is rotationally contained between plns 50 and 52 on lever arm 42 so that when the handle 212 is slightly rotated spring piece 220 lifts latch pin 54 which allows protrusion piece 200 to move lever arm 42 from the locked position to the unlocked position. The rotational movement of cam 201 is limited by 221 in the locked position contacting stop pin 222 on cylinder 206 while 223 in the unlocked position contacts stop pin 222. For normal operation flexible tip 220 moves the latch pin by engaging either pin 50 or 52 projecting from the lever arm 42 at either end of the rotational arc while protrusion piece 200 moves through an arc to move the lever arm through higher force re~uirements such as when the dead bolt is pressured by pushing on the door during handle operation, thus protecting the more delicate pins 50 and 52 and the flexible tip 220 from higher forces. However at the end of the movement at either end of the arc, tip 220 flexes sufficiently to insure that stops 221 and 223 will always take the high forces that an operator may apply to handle 212. This flexible tlp 220 is particularily important when retro-fitting a large variety of different lock mechanisms because the dimensional accuracy of the components such as 50 and 52 etc., are not good enough to be able to rely on fixed dimensioned cam surfaces such as 221 and 223 in order to prevent high forces from being applied to pins 50 and 52.
?~7~
engage the tapered external spline on shaft 202 at 214 whlle screw 215 passes into hole 216 in handle 212 to thread into shaft 202 at the internally threaded hole 217. Disc 21~ serves to cover screw 215 to improve the appearance and also to prevent or deter people getting at screw 215. In operation, cam 201 is fitted with a flexible spriny blade 220 which is rotationally contained between pins 50 and 52 on lever arm 42 so that when the handle 212 is slightly rotated spring piece 220 lifts latch pin 54 which allows protrusion piece 200 to move lever arm 42 from the locked position to the unlocked position. The rotational movement of cam 201.is limited by 221 in the locked position contacting stop pin 222 on cylinder 206 while 223 in the unlocked~position contacts stop pin 222. For normal operation flexible tip 220 moves the latch pin by engaging either pin 50 or 52 projecting from the lever arm 42 at either end of the rotational arc while protrusion piece 200 moves thraugh an arc to move the lever arm through higher force re~uirements such as when the dead bolt is pressured by pushing on the door during handle operation, thus protecting the more delicate pins 50 and 52 and the flexible tip 220 from higher forces. However at the end of the movement at either end of the arc, tip 220 flexes sufficiently to insure that stops 221 and 223 will always take the high forces that an operator may apply to handle 212. This flexible tip 220 is particularily important when retro-fitting a large variety of different lock mechanisms because the dimensional accuracy of the components such as 50 and 52 etc., are not good enough to be able to rely on fixed dimensioned cam surfaces such as 221 and 223 in order to prevent high forces from being applied to pins 50 and 52.
When the patent is applied for -the other more subtle aspçcts of the design will be amplified.
~ 3
~'ield of Invention This invention relates to improvements in door locks, and in particular to the type manufactured and sold by Adams Rite Industries as described in patent #1216317 issued by the Canadian Patent Office to Mr. Todd and Mr. Vulacovic. These locks comprise the largest percentage of the locks used commercially in North ~merica and in many other countries.
Prior Art These locks are made to be universally fitted ,to commercial building doors. They have identical receptacles on the inside and the outside of the door and are usually fitted wi-th key operated cylinders from the outside and by thumbturn cylinders from the inside. The chief difficulty is that thumbturns may be very difficult or impossible to operate in the case of emergency where under panic conditions people may press against the door to get out and this pressure will cause the lock to be difficult to operate particularily because of the small leverage that the thumbturn permits. The result is that in panic conditions where there may be fumes and smoke, people are being locked in buildings that are on fire which results in many fatalities. This has resulted in many jurisdictions enacting laws and regulations requiring that such locks be fitted with a larger, 90 degree turn door handle. Many attempts have been made to design a handle that could be fitted to this type of lock in place of the thumbturn. Two methods have been used in these attempts, neither of which is acceptable.
In the one case the cam is designed to attach to the actuator shaft and to engage the same pins that are now engaged by either the thumbturn or the key operated cylinder. The problem with this is that these pins are not strong enough to accept the increased torque that can be applied by a larger handle. The alternative has been that designers have modified component~ of the lock so that the locXs have to be removed and modified and this is unacceptable to either the regulatory bodies or the manufacturer of the locX.
2 0 ~
The new design here to be described was invented by J. Cowl'ey and R. Bernard of Cowley Technologies Incorporated and was prototyped and -tested on a large variety of locksets and was shown to be adaptable to all of the locks that were tested.
~e therefore believe that this kit of parts is universally adaptable to all of the Bradstock locks. It meets the torque requirements because the operating shaft incorporates a special cam which directly engages the operating lever of the lock which effectively bypasses the low strength pins which are now engaged in the locking or unlocking operatiion in the thumbturn or key operations.
The handle also operates at less than a 90 degrees turn and always unlocks the door on the downward rotation on either right or left hand doors.
Another important feature of this invention is that ,~
the components can be rapidly installed without '~' removing the lock from the door.
The operation of this type of lock fitted with this kit of replacement parts will now be described.
.
With reference to the drawings, Figure 1 i5 an isometric view of the basic Bradstock lock while Figure 2 is a ~ectional view of the same lock showing the lever arm and related components.'Figures 1 and 2 are excerpts from Canadian Patent 1216317. Components 42 etc. are taken from these drawings Figures 1 and 2.
While we consider these excerpts to be sufficient to understand our improvements to the lock functions it would perhaps be preferable if the reader obtained a copy of the Canadian Patent 1216317. Figure 10 is an exploded assembly of the new components. Figure 11 is a front view of the lever arm showing the relation ,' of the new components. In order to ~void confusion thç''~
new components will be numbered starting at 200. '~, The operation is desribed as ollows: ;
Oval protrusion piece 200 is welded to cam 201, and shaft 202 is riveted into cam 201 engaginy splines at 203 and 204 providing torsional strength.
Oval protrus-on piece 200 is welded to cam 201 so that the protrusion piece 200 engages the id.
of hole 48a in lever arm 42. Sleeve 205 is threaded to match the threads internally at 16 in Figure 1 while cylinder 206 fits snugly inside of sleeve 2~5 so that keyway 207 engages an inward protrusion 208 i~ the wall of sleeve 205 while set screw 33 passes through hole 209 to bear on cylinder 206 at 210. Shaft 202 passes snugly through hole 211 in cylinder 206 to attach to handle 212 by engaging a matching splined tapered internal cavity and snugly engage the tapered external spline on shaft 202 at 214 while screw 215 passes into hole 216 in handle 212 to thread into shaft 202 at the internally threaded hole 217. Disc 21~ serves to cover screw 215 to improve the appearance and also to prevent or deter people getting at screw 215. In operation, cam 201 is fitted with a flexible spring blade 220 which is rotationally contained between plns 50 and 52 on lever arm 42 so that when the handle 212 is slightly rotated spring piece 220 lifts latch pin 54 which allows protrusion piece 200 to move lever arm 42 from the locked position to the unlocked position. The rotational movement of cam 201 is limited by 221 in the locked position contacting stop pin 222 on cylinder 206 while 223 in the unlocked position contacts stop pin 222. For normal operation flexible tip 220 moves the latch pin by engaging either pin 50 or 52 projecting from the lever arm 42 at either end of the rotational arc while protrusion piece 200 moves through an arc to move the lever arm through higher force re~uirements such as when the dead bolt is pressured by pushing on the door during handle operation, thus protecting the more delicate pins 50 and 52 and the flexible tip 220 from higher forces. However at the end of the movement at either end of the arc, tip 220 flexes sufficiently to insure that stops 221 and 223 will always take the high forces that an operator may apply to handle 212. This flexible tlp 220 is particularily important when retro-fitting a large variety of different lock mechanisms because the dimensional accuracy of the components such as 50 and 52 etc., are not good enough to be able to rely on fixed dimensioned cam surfaces such as 221 and 223 in order to prevent high forces from being applied to pins 50 and 52.
?~7~
engage the tapered external spline on shaft 202 at 214 whlle screw 215 passes into hole 216 in handle 212 to thread into shaft 202 at the internally threaded hole 217. Disc 21~ serves to cover screw 215 to improve the appearance and also to prevent or deter people getting at screw 215. In operation, cam 201 is fitted with a flexible spriny blade 220 which is rotationally contained between pins 50 and 52 on lever arm 42 so that when the handle 212 is slightly rotated spring piece 220 lifts latch pin 54 which allows protrusion piece 200 to move lever arm 42 from the locked position to the unlocked position. The rotational movement of cam 201.is limited by 221 in the locked position contacting stop pin 222 on cylinder 206 while 223 in the unlocked~position contacts stop pin 222. For normal operation flexible tip 220 moves the latch pin by engaging either pin 50 or 52 projecting from the lever arm 42 at either end of the rotational arc while protrusion piece 200 moves thraugh an arc to move the lever arm through higher force re~uirements such as when the dead bolt is pressured by pushing on the door during handle operation, thus protecting the more delicate pins 50 and 52 and the flexible tip 220 from higher forces. However at the end of the movement at either end of the arc, tip 220 flexes sufficiently to insure that stops 221 and 223 will always take the high forces that an operator may apply to handle 212. This flexible tip 220 is particularily important when retro-fitting a large variety of different lock mechanisms because the dimensional accuracy of the components such as 50 and 52 etc., are not good enough to be able to rely on fixed dimensioned cam surfaces such as 221 and 223 in order to prevent high forces from being applied to pins 50 and 52.
When the patent is applied for -the other more subtle aspçcts of the design will be amplified.
~ 3
Claims (3)
1) In the door lock of the type having a rotatably mounted cam which has a detent which serves to displace a latching member and to engage a downstream abutment member of a pair of abutment members which are arranged upstream and downstream of a locking member with respect to the direction of rotation of said rotatably mounted cam, said abutment members being mounted on a lever arm which is connected to a locking bolt such that rotation of said rotatably mounted cam in one direction or the other will cause said detent to displace said locking member and thereafter engage said downstream abutment member to effect movement of said lever arm which in turn effects movement of said locking bolt between an open position and a closed position and moves said downstream abutment member to its' limit, so as to permit said detent to rest against said abutment member until the direction of rotation of said rotatably mounted cam is reversed to effect the movement of said locking member from a closed position to an open position, at which position said detent rests against the alternate of said pair of abutment members.
2) As in Claim 1, a protrusion piece attached to the lower face of said rotatably mounted cam, the access of said protrusion piece being parallel to the rotational access of said rotatably mounted cam with the displacement of said protrusion piece access being such that said protrusion piece will engage an assembly hole located in said lever arm which serves to transmit the force required to move said locking member in a manner which bypasses these forces from being applied to said abutment members, except for low forces required to retain said detent between the two said abutment members.
3) Said rotatably mounted cam for use in a door lock of the type having said detent for displacing said latching member which is mounted on said lever arm which is connected to said locking bolt, said lever arm having said abutment members located on either side of the path of travel along which said latching member is movable and a shaft mounted for rotation proximate said latching member for supporting said rotatably mounted cam for angular movement about said access with said abutment members being positioned in said upstream position and said downstream position with respect to one another relative to the direction of rotation of said rotatably mounted cam in use, said rotatably mounted cam comprising a cam body having an access of rotation, a flexible tip projecting radially and centrally on a slot formed in the rotatably mounted cam, said flexible tip serving as said detent to unlatch said latching member, said flexible tip being formed of spring material so that it will deflect when a certain limited rotational force is applied to said rotatably mounted cam in either direction, said rotational force being taken by either of the right or left rotationally contacted said abutment members, said force being sufficient to act in the unlatching action but not sufficient to damage said abutment members.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2047101 CA2047101A1 (en) | 1991-07-15 | 1991-07-15 | Emergency lever handle for narrow stile deadbolt locks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2047101 CA2047101A1 (en) | 1991-07-15 | 1991-07-15 | Emergency lever handle for narrow stile deadbolt locks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2047101A1 true CA2047101A1 (en) | 1993-01-16 |
Family
ID=4148013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2047101 Abandoned CA2047101A1 (en) | 1991-07-15 | 1991-07-15 | Emergency lever handle for narrow stile deadbolt locks |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2047101A1 (en) |
-
1991
- 1991-07-15 CA CA 2047101 patent/CA2047101A1/en not_active Abandoned
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8522582B2 (en) | Dual lock apparatus | |
| US5878606A (en) | Door lock for swinging door | |
| US4237711A (en) | Lock mechanism | |
| US6860129B2 (en) | Security classroom function lock mechanism | |
| US20040163431A1 (en) | Mortice lock | |
| US7213426B2 (en) | Storm door mortise lock that prevents lockout | |
| US4671549A (en) | Tubular automatic deadbolt latch | |
| CN111255293A (en) | lock assembly | |
| US20060144102A1 (en) | Dual lock apparatus | |
| US3604229A (en) | Dead bolt and latch door lock | |
| CA2047101A1 (en) | Emergency lever handle for narrow stile deadbolt locks | |
| EP0552033B1 (en) | Locking handle | |
| GB2322902A (en) | Latch and deadbolt locksets | |
| US4590777A (en) | Doorlock | |
| GB2226358A (en) | Improvements in or relating to handle assemblies | |
| GB2226359A (en) | Improvements in or relating to lockable handle assemblies | |
| CN111868345B (en) | lock assembly | |
| AU785407B2 (en) | Improvements in locks | |
| GB2233033A (en) | Deadlocking night latch | |
| WO1997033060A1 (en) | A lockset | |
| AU2010202816A1 (en) | A Dual Lock Apparatus | |
| GB2244755A (en) | A handle assembly for a pivoted window or door | |
| AU627495B2 (en) | Improved rack lock | |
| AU2006201255A1 (en) | Improvements in Locks | |
| WO1989008763A1 (en) | A door lock |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |