AU6549801A - Electric strike - Google Patents
Electric strike Download PDFInfo
- Publication number
- AU6549801A AU6549801A AU65498/01A AU6549801A AU6549801A AU 6549801 A AU6549801 A AU 6549801A AU 65498/01 A AU65498/01 A AU 65498/01A AU 6549801 A AU6549801 A AU 6549801A AU 6549801 A AU6549801 A AU 6549801A
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- AU
- Australia
- Prior art keywords
- obstruction
- retaining
- frame
- electric strike
- 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.)
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Description
100/011 Regulation 3.2
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT Invention title: Electric strike The following statement is a full description of this invention, including the best method of performing it known to us: dxbmM01109971610000000 27.8.2001 Page 1 Electric strike Field of the invention The invention relates to electric strikes for doors and the like for mounting in a door frame or the like.
Background of the invention A strike for a door frame is a device for releasably retaining a latch bolt mounted on a door in the door frame. Electric strikes are strikes containing a solenoid for either locking or unlocking a strike by energising the solenoid.
An electric strike is described as fail safe if the strike is in an unlocked state when the solenoid is de-energised but may be locked from the unlocked position by energising the solenoid. An electric strike is described as fail secure if the strike is in a locked state when the solenoid is de-energised but may be unlocked from the locked position by energising the solenoid.
Fail safe electric strikes are used in many applications where it is desired that doors employing the strikes may be opened in the event that power is lost. Likewise, fail secure electric strikes are used in many applications where it is desired that doors employing the strikes will remain locked in the event that power is lost.
It is desirable to have a single electric strike that may embody both fail safe and fail secure 0 *20 modes of operation.
One electric strike is known to the applicant which is convertible between fail safe and fail secure operation. However, this strike is difficult to convert between the two modes of operation. One must partially dismantle the device, re-orient small pieces which are difficult to handle, and then re-assemble the device in order to convert the strike between the two modes. This may be a time consuming, difficult and/or awkward operation. The applicant does not admit that this strike or its shortcomings constitute common general knowledge in the relevant art in Australia before filing this application.
It is accordingly desirable to have a single electric strike that is capable of being more readily switched between fail safe and fail secure operation.
jam M0110990938v 304629349 24.8.2001 Summary of the invention According to an aspect of the present invention, there is provided an electric strike for a door frame, the strike being for releasably retaining a latch bolt mounted on a door in the door frame, the strike comprising: a frame; retaining means for retaining the latch bolt, the retaining means being moveable with respect to the frame between a latch retaining position in which the latch bolt is retained by the retaining means and a latch releasing position in which the latch bolt is not retained by the retaining means; a locking assembly including obstruction means, the obstruction means being for releasably locking the retaining means in the latch retaining position; wherein the locking assembly is moveable between a fail safe position in which the strike provides fail safe operation and a fail secure position in which the strike provides fail secure operation.
Preferably, the locking assembly is slidably moveable with respect to the frame.
Preferably, the locking assembly is arranged so that: in the fail safe position, the obstruction means is moveable between a first locking position in which the retaining means is locked in the retaining position and a ".position in which the retaining means is not locked in the retaining position; and in the fail secure position, the obstruction means is moveable between a second locking position in which the retaining means is locked in the retaining position and a position in which the retaining means is not locked in the retaining position.
In a preferred form of the present invention, the obstruction means comprises a group of at least two pins. Preferably, the pins are of the same length. In this embodiment the pins within the group need not be reordered to convert the strike between fail safe and fail secure modes of operation.
Preferably the obstruction means locks the retaining means by extending across a surface mechanically associated with the retaining means to prevent movement of the retaining rjam M0110990938v0 304629349 24.8.2001 means. Preferably, the surface mechanically associated with the retaining means is a surface of a member extending rigidly from the retaining means.
According to another aspect of the present invention, there is provided a strike for a door frame, the strike being for releasably retaining a latch bolt mounted on a door in the door frame, the strike comprising: a frame; retaining means for retaining the latch bolt, the retaining means being moveable with respect to the frame between a latch retaining position in which the latch bolt is retained by the retaining means and a latch releasing position in which the latch bolt is not retained by the retaining means; a holding member mechanically associated with the retaining means such that the 0% retaining means is not permitted to move with respect to the frame away from the latch releasing position unless the holding member is permitted to move with respect to the frame; 15 obstruction means moveable between: oo a first obstruction position in which the obstruction means prevents movement of the holding member with respect to the frame; (ii) a second obstruction position in which the obstruction means prevents movement of the holding member with respect to the frame; and 20 (iii) at least one release position in which the obstruction means permits movement of the holding member with respect to the frame; stopping means for limiting movement of the obstruction means, the stopping means being moveable between: a fail safe position wherein the stopping means only permits movement of the obstruction means between the first obstruction position and a release position associated with the fail safe position; and jam M0110990938v 304629349 24.8.2001 (ii) a fail secure position wherein the stopping means only permits movement of the obstruction means between the second obstruction position and a release position associated with the fail secure position; a plunger for moving the obstruction means; a solenoid for moving the plunger in at least one direction; and biasing means for urging the obstruction means in a direction opposed to the at least one direction in which the solenoid may move the plunger; wherein the biasing means and the solenoid are arranged such that: in the fail safe position of the stopping means:the biasing means urges the S 10 obstruction means towards the release position associated with the fail safe S"position; and e• energisation of the solenoid causes the plunger to drive the obstruction means to the first obstruction position; and in the fail secure position of the stopping means: the biasing means urges the obstruction means towards the second obstruction position; and (ii) energisation of the solenoid causes the plunger to drive the obstruction means to the release position associated with the fail secure position.
eoet The frame according to the present invention may take any suitable form. It may be a single member. It may be formed from more than one member. It may form all or part of a housing for the strike. It may simply be a base to which the retaining means is movably attached.
The retaining means according to the present invention may take any suitable form in order to retain a latch bolt or the like.
In one embodiment of the invention, the retaining means may also act as a strike plate. In this embodiment, the retaining means includes a suitably shaped surface over which a retractable latch bolt may ride when the door is being closed. The surface may be curved.
It may be flat. In this way, the latch bolt may be caused to temporarily retract to enable the rjam M0110990938v1 304629349 24.8.2001 door to be closed. In this arrangement, the latch bolt will be biased towards an extended position so that once it has ridden over the strike plate, it will extend into a recess behind the strike plate so as to be retained by the retaining means of the strike.
Preferably, the retaining means is hinged with respect to the frame.
The holding member according to the present invention may be mechanically associated with the retaining means in any manner such that the retaining means is not permitted to move with respect to the frame away from the latch releasing position unless the holding member is permitted to move with respect to the frame. In a preferred embodiment of the present invention, the holding member rigidly extends from the retaining means. In this way, the retaining means may not move with respect to the frame unless the holding member is permitted to move with respect to the frame.
Preferably, the holding means is formed integrally with the retaining means.
The obstruction means according to the present invention may be any suitable means for, •in one position, preventing movement of the holding member with respect to the frame, while, in another position, being capable of allowing the holding member to move with respect to the frame.
S
In a preferred embodiment of the present invention, the obstruction means comprise a group of at least two pins. Preferably the pins are of the same length. Preferably the pins ooo° are axially aligned. Preferably the pins are linearly moveable between the first obstruction 20 position, the second obstruction position and the release position or positions.
o In a particularly preferred embodiment, in the first obstruction position of the pins, one of the at least two pins extends across the holding means and a surface connected to, or forming part of, the frame in order to prevent movement of the holding means with respect to the frame. In this embodiment, in the second obstruction position of the pins, another of the at least two pins extends across the holding means and the surface connected to, or forming part of, the frame to prevent movement of the holding means with respect to the frame. Also in this embodiment, the at least two pins may adopt a single release position wherein no pin extends across the holding means and the surface connected to, or forming part of, the frame. In a preferred embodiment, in the release position, at least one of the at rjam M0110990938v 304629349 24.8.2001 least two pins may be carried by the holding means if the holding means moves with respect to the frame.
Stopping means according to the present invention may take any suitable form.
The stopping means may comprise a member which is slidably movable with respect to the frame. Preferably the member is a plate. The member preferably carries two opposed stopping surfaces, each stopping surface limiting the movement of the obstruction means between extreme positions.
In a preferred embodiment, the stopping means comprises a plate which carries the solenoid, and a wall of the solenoid is a stopping surface. In this embodiment, the opposed stopping surface is provided by a spring loaded member which urges the obstruction means S-towards a release position or an obstruction position, depending on the location of the stopping means, ie. according to whether the stopping means is in the fail safe position or the fail secure position.The biasing means according to the present invention may take any suitable form. The biasing means may be a spring. It may be a spring loaded microswitch.
In a preferred form of the present invention, the biasing means is a spring loaded microswitch, which also functions as a stopping surface when the switch is fully retracted.
oooo The position of the microswitch may be used to provide an electrical signal that indicates the position of the obstruction means.
ao Description of the drawings 20 The invention will now be further explained and illustrated by reference to the S-accompanying drawings.
Figure 1 a is a schematic view of an electric strike according to one form of the invention.
The strike is in fail safe mode, and the solenoid is de-energised.
Figure lb is a schematic view of the electric strike shown in Figure la. The strike is in fail safe mode, and the solenoid is energised.
Figure 2a is a schematic view of the electric strike shown in Figure Ia. The strike is in fail secure mode, and the solenoid is de-energised.
Figure 2b is a schematic view of the electric strike shown in Figure la. The strike is in fail secure mode, and the solenoid is energised.
rjam M0110990938vl 304629349 24.8.2001 Figure 3 shows an exploded isometric view of an electric strike that embodies the principles depicted in the schematic diagrams (Figures 1 a to 2b).
Figure l a shows a schematic view of the operative components of an electric strike according to the present invention, generally designated 10. Strike 10 includes a frame 12 having plates 14 and 16. Strike 10 also has a retaining means in the form of a strike plate 18. Strike plate 18 includes a holding means in the form of an integrally formed holding plate 20 extending rigidly therefrom.
Plates 14 and 16 have holes 22 and 24. Holding plate 20 has a hole 26 which, in the configurations illustrated in figures I a to 2b, is aligned with holes 22 and 24.
The strike 10 includes obstruction means in the form of three equal length locking pins, designated 30, 32 and 34 respectively. In the configurations illustrated in figures la to 2b, pins 30, 32 and 34 are located at least partially within the channel defined by holes 22, 24 and 26.
The strike 10 also includes a plate 40. Plate 40 is slidably moveable with respect to frame 12 between the position shown in Figures la and Ib, and the position shown in Figures 2a and 2b.
Plate 40 carries a solenoid 42 and biasing means in the form of a spring loaded microswitch 46. Spring loaded microswitch 46 urges the pins 30, 32 and 34 to the left when strike 10 is in a configuration shown in Figures 1 a to 2b.
20 The solenoid 42 includes a plunger 44. When solenoid 42 is energised from the de-energised state shown in Figure l a, solenoid 42 drives plunger 44 to the right to the position shown in Figure lb. When moving from the position shown in Figure la to the position shown in Figure lb, plunger 44 drives pins 30, 32 and 34 to the right against the spring bias provided by microswitch 46. When solenoid 42 is de-energised, microswitch 46 pushes pins 30, 32 and 34 and plunger 44 back to the position shown in Figure 1 a.
Similarly, when the solenoid is energised from the de-energised state shown in Figure 2a, solenoid 42 drives plunger 44 to the right (with reference to the figures) to the position shown in Figure 2b. Again, when moving from the position shown in Figure 2a to the position shown in Figure 2b, plunger 36 drives pins 30, 32 and 34 to the right against the rjam M0110990938vl 304629349 24.8.2001 8 spring bias provided by microswitch 46. When solenoid 42 is de-energised, microswitch 46 pushes pins 30, 32 and 34 and plunger 44 back to the position shown in Figure 2a.
In the configurations shown in Figures 1 a and 2b, holding plate 20 is not prevented by any of pins 30, 32 or 34 from moving from the position shown, since no pins extend across holding plate 20 and plate 14 or 16. Thus, in the configurations shown in Figures la and 2b strike plate 18 may be rotated. Rotation of strike plate 18 will cause holding plate 20 to rotate. Pin 32 is then carried by holding plate 20 out of the position shown in Figure l a or 2b.
In the configurations shown in Figures lb and 2a, holding plate 20 is prevented from moving from the position shown, thus preventing rotation of strike plate 18. In Figure lb pin 30 extends across plate 14 and holding plate 20, and pin 32 extends across plate 16 and holding plate 20. In Figure 2a pin 32 extends across plate 14 and holding plate 20, and pin 34 extends across plate 16 and holding plate The configurations of the strike shown in Figures la and lb represent fail safe operation since strike plate 18 is free to move from the latch retaining position shown in Figure 1 a to the latch releasing position (not shown) when solenoid 42 is de-energised.
The configurations of the strike shown in Figures 2a and 2b represent fail secure operation *since strike plate 18 may not move from the latch retaining position shown in Figure 2a when solenoid 42 is de-energised.
When strike plate 18 moves from the latch retaining position shown in Figure 1 a or Figure :5 2b to the latch releasing position (not shown), holding plate 20 rotates in a direction (with reference to the Figures) into the page. Holding plate 20 carries pin 32 within hole 26 when so moving. When strike plate 18 is in the latch releasing position portions of the surface of holding plate 20 at least partially obstruct holes 22 and 24 so that pin 30 is retained in hole 22 and pin 34 is retained in hole 24.
Figure 3 shows an exploded isometric view of an electric strike that embodies the principles depicted in the schematic diagrams (Figures 1 a to 2b).
Frame 12 is made from cast steel. Plates 14 and 16 are integrally formed with frame 12.
Strike plate 18 is pivotally mounted on frame 12 via bearing pin 2 so as to be able to rotate jam M0110990938vl 304629349 24.8.2001 9 between a latch releasing position and a latch retaining position. Spring 4 is provided to bias strike plate 18 towards the latch retaining position.
The strike 10 is provided with a cover 6 to protect the strike mechanism.
Plate 40 is formed from metal sheeting and is shaped to include two mounting pins 50 for mounting microswitch 46 to plate 40. Solenoid 42 is suitably affixed to plate 40. Plate is also provided with threaded holes 52 for holding plate 40 in the fail safe position or the fail secure position, as the case may be, by means of screws 54. Frame 12 is provided with slotted holes 56 to enable plate 40 to slide between fail safe and fail secure positions.
Strike 10 may be switched between a fail safe position and a fail secure position by sliding plate 40 to the appropriate position with respect to frame 12. In this regard, plate 40 is S. provided with a projection (on the side of the plate that is not visible in Figure 3) for switching strike 10 between fail safe and fail secure operation. When plate 40 is installed in frame 12, the projection passes through a slot in the frame so as to be readily accessible from outside frame 12. Manually pushing the projection causes plate 40 to slide to the appropriate position with respect to frame 12.
It will be readily apparent to those skilled in the art that the present invention provides an improved electric strike that is conveniently and readily switchable between fail safe and fail secure operation.
0•6 The word 'comprising' and forms of the word 'comprising' as used in this description does not limit the invention claimed to exclude any variants or additions.
Modifications and improvements to the invention will be readily apparent to those skilled in the art. Such modifications and improvements are intended to be within the scope of this invention.
rjam M0110990938vl 304629349 24.8.2001
Claims (15)
1. An electric strike for a door frame, the strike being for releasably retaining a latch bolt mounted on a door in the door frame, the strike comprising: a frame; retaining means for retaining the latch bolt, the retaining means being moveable with respect to the frame between a latch retaining position in which the latch bolt is retained by the retaining means and a latch releasing position in which the latch bolt is not retained by the retaining means; a locking assembly including obstruction means, the obstruction means being for releasably locking the retaining means in the latch retaining position; wherein the locking assembly is moveable between a fail safe position in which the strike provides fail safe operation and a fail secure position in which the strike provides fail secure operation. 15 2. An electric strike according to claim 1, wherein the locking assembly is slidably P moveable with respect to the frame.
3. An electric strike according to claim 1 or claim 2 wherein the locking assembly is arranged so that: in the fail safe position, the obstruction means is moveable between a first 20 locking position in which the retaining means is locked in the retaining position and a position in which the retaining means is not locked in the retaining position; and in the fail secure position, the obstruction means is moveable between a second locking position in which the retaining means is locked in the retaining position and a position in which the retaining means is not locked in the retaining position.
4. An electric strike according to any one of the preceding claims wherein the obstruction means comprises a group of at least two pins. jam M0110990938vl 304629349 24.8.2001 11 An electric strike according to claim 4 wherein the pins are of substantially the same length.
6. An electric strike according to any one of the preceding claims wherein the obstruction means locks the retaining means by extending across a surface mechanically associated with the retaining means to prevent movement of the retaining means.
7. An electric strike according to claim 6 wherein the surface mechanically associated with the retaining means is a surface of a member extending rigidly from the retaining means.
8. An electric strike for a door frame, the strike being for releasably retaining a latch bolt mounted on a door in the door frame, the strike comprising: a frame; retaining means for retaining the latch bolt, the retaining means being moveable with respect to the frame between a latch retaining position in 15 which the latch bolt is retained by the retaining means and a latch releasing r. position in which the latch bolt is not retained by the retaining means; a holding member mechanically associated with the retaining means such that the retaining means is not permitted to move with respect to the frame away from the latch releasing position unless the holding member is permitted to move with respect to the frame; obstruction means moveable between: a first obstruction position in which the obstruction means prevents movement of the holding member with respect to the frame; (ii) a second obstruction position in which the obstruction means prevents movement of the holding member with respect to the frame; and (iii) at least one release position in which the obstruction means permits movement of the holding member with respect to the frame; rjam M0110990938vl 304629349 24.8.2001 stopping means for limiting movement of the obstruction means, the stopping means being moveable between: a fail safe position wherein the stopping means only permits movement of the obstruction means between the first obstruction position and a release position associated with the fail safe position; and (ii) a fail secure position wherein the stopping means only permits movement of the obstruction means between the second obstruction position and a release position associated with the fail secure position; a plunger for moving the obstruction means; a solenoid for moving the plunger in at least one direction; and biasing means for urging the obstruction means in a direction opposed to the at least one direction in which the solenoid may move the plunger; S15 wherein the biasing means and the solenoid are arranged such that: *5e in the fail safe position of the stopping means: the biasing means urges the obstruction means towards the release position associated with the fail safe position; and (ii) energisation of the solenoid causes the plunger to drive the obstruction means to the first obstruction position; and in the fail secure position of the stopping means: the biasing means urges the obstruction means towards the second obstruction position; and (ii) energisation of the solenoid causes the plunger to drive the obstruction means to the release position associated with the fail secure position. jam M0110990938vl 304629349 24.8.2001 13
9. An electric strike according to claim 8 wherein the holding member rigidly extends from the retaining means. An electric strike according to claim 9 wherein the holding means is formed integrally with the retaining means.
11. An electric strike according to any one of claims 8 to 10 wherein the obstruction means comprise a group of at least two pins.
12. An electric strike according to claim 11 wherein the pins are of substantially the same length.
13. An electric strike according to claim 11 or claim 12 wherein the pins are axially aligned. too1 14. An electric strike according to any one of claims 11 to 13 wherein the pins are linearly moveable between the first obstruction position, the second obstruction position and the release position or positions. An electric strike according to any one of claims 11 to 14 wherein, in the first obstruction position of the pins, one of the at least two pins extends across the oo* holding means and a surface connected to, or forming part of, the frame in order to prevent movement of the holding means with respect to the frame, and wherein, in second obstruction position of the pins, another of the at least two pins extends across the holding means and the surface connected to, or forming part of, the frame to prevent movement of the holding means with respect to the frame. S.
16. An electric strike according to claim 15 having a single release position for the at least two pins in which no pin extends across the holding means and the surface connected to, or forming part of, the frame.
17. An electric strike according to claim 16 arranged such that in the release position at least one of the at least two pins is carried by the holding means if the holding means moves with respect to the frame.
18. An electric strike according to any one of claims 8 to 17 wherein the stopping means comprises a member which is slidably movable with respect to the frame. jam M0110990938v1 304629349 24.8.2001 14
19. An electric strike according to one of claims 8 to 18 wherein the stopping means carries two opposed stopping surfaces, each stopping surface limiting the movement of the obstruction means between extreme positions. An electric strike according to claim 19 wherein the stopping means comprises a member which carries the solenoid, the opposed stopping surfaces being respectively a wall of the solenoid and a spring loaded member which urges the obstruction means towards a release position or an obstruction position according to whether the stopping means is in the fail safe position or the fail secure position.
21. An electric strike according to any one of the preceding claims substantially as described herein with reference to the drawings. Trimec Technology Pty Ltd 27 August 2001 rjam M0110990938v1 304629349 24.8.2001
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU65498/01A AU782362B2 (en) | 2000-08-30 | 2001-08-27 | Electric strike |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPQ9786 | 2000-08-30 | ||
| AUPQ9786A AUPQ978600A0 (en) | 2000-08-31 | 2000-08-31 | Electric strike |
| AU65498/01A AU782362B2 (en) | 2000-08-30 | 2001-08-27 | Electric strike |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU6549801A true AU6549801A (en) | 2002-03-07 |
| AU782362B2 AU782362B2 (en) | 2005-07-21 |
Family
ID=25634751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU65498/01A Expired AU782362B2 (en) | 2000-08-30 | 2001-08-27 | Electric strike |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU782362B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7131673B2 (en) | 2002-04-14 | 2006-11-07 | Southco, Inc. | Electromechanical keeper |
| AU2007101222B4 (en) * | 2003-12-03 | 2009-03-19 | Ingersoll-Rand Architectural Hardware Limited | Improved Lock |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2251024B (en) * | 1990-11-09 | 1994-06-22 | Trimec Securities Pty Ltd | Improvements in locks |
| CA2107725C (en) * | 1993-07-19 | 2003-12-23 | Alan K. Uyeda | Electric strike for fail safe or fail secure operation |
-
2001
- 2001-08-27 AU AU65498/01A patent/AU782362B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7131673B2 (en) | 2002-04-14 | 2006-11-07 | Southco, Inc. | Electromechanical keeper |
| AU2007101222B4 (en) * | 2003-12-03 | 2009-03-19 | Ingersoll-Rand Architectural Hardware Limited | Improved Lock |
Also Published As
| Publication number | Publication date |
|---|---|
| AU782362B2 (en) | 2005-07-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |