EP0103429A2 - Locking device - Google Patents
Locking device Download PDFInfo
- Publication number
- EP0103429A2 EP0103429A2 EP83304874A EP83304874A EP0103429A2 EP 0103429 A2 EP0103429 A2 EP 0103429A2 EP 83304874 A EP83304874 A EP 83304874A EP 83304874 A EP83304874 A EP 83304874A EP 0103429 A2 EP0103429 A2 EP 0103429A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- locking mechanism
- spindle
- locking device
- gear wheel
- lock
- 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.)
- Ceased
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B65/00—Locks or fastenings for special use
- E05B65/0075—Locks or fastenings for special use for safes, strongrooms, vaults, fire-resisting cabinets or the like
Definitions
- the present invention relates to locking devices which are particularly but not exclusively suitable for use in the lid or door of an underfloor safe.
- a locking device comprising at least two bolts, each rotatable between an open and a closed position by a first locking mechanism, and a second locking mechanism adapted to lock the first locking mechanism against movement to retract the bolts, the second locking mechanism beingreleasable by a sequence of at least two operations.
- the second locking mechanism is actuable to disengage by an unlocking action of an externally accessible lock, followed by a relocking action of the same lock.
- the first locking mechanism comprises a first gear wheel on each of the bolts, which gear wheels mesh with a single second gear wheel.
- the second locking mechanism may include a blind gear wheel which is moveable into engagement with the said first gear wheels to prevent the said first gear wheels turning to retract the bolts.
- the blind gear has sufficient cogs to mesh with the first gear wheels, but insufficient cogs to enable the wheels to be rotated to retract the bolts.
- the second locking mechanism includes means for locking the blind gear in engagement with the said first gear wheels including at least one externally accessible lock, in such a way that if an external lock is broken the blind gear remains in engagement with the first gears and the bolts cannot be retracted.
- Each accessible lock is advantageously connected to rotate an inclined cam face which is adapted to be located above or below a disk mounted co-axially with the second gear.
- the inclined cam may have a gap so that it can be rotated out of the path of the said disk to enable the disk to move freely along its axis.
- the disk is spring biassed towards the upward position by a limited amount.
- the inclined cam face can be part of a large screw so that it can move the disk by itself up and down the axis.
- the locking device illustrated in the drawings comprises three bolts 11 shaped as shown in the drawings and each being rotatable on its own spindle 12 through approximately 90°. Each of these bolts 11 has attached thereto on its upper surface concentric with the gear wheel a multi-toothed gear wheel 13. The three bolts 11 when extended engage under a flange on the safe body and prevent the removal of the door or lid 10.
- the three gear wheels 13 are engageable with a central gear 14 which is mounted on a central spindle 15.
- the outer end of the spindle 15 is provided with a head 16 which is indented at 17 so that the spindle can be turned from the outside of the safe by a screw driver or by a special key or device.
- each spindle 12 on which a gear wheel 13 is mounted has a layer of tungsten carbide 18.
- the system of co-operating gear wheels 13, 14 forms the first locking mechanism for the bolts.
- a second locking mechanism which locks the first locking mechanism.
- This second locking mechanism involves a limited axial movement of the spindle 15 inwardly against an outward bias from a coiled spring 19.
- the spring 19 sits in a bore 20 at the inner end of the spindle -15 and engages in a seating 21 in the bottom of the bore 22 of the safe lid 10 which contains the central spindle and its appendages.
- a disk 24 which is flat on top and chamfered on the underside which is inward of the lid. All three items, the driving gear 14 , the blind gear 23 and the disk 24 are concentric on the central spindle 15 and of equal diameter.
- the lid adjacent to the disk 24 there is at least one ramped cam 25, in essence rather like part of a helter-skelter, but mounted on a spindle to be rotateable.
- a portion of the upper surface is flat and the under surface is flat.
- the ramp portion of the cam 25 extends from the top to the bottom over an angle of approximately 180°. Part of the cam is cut-away to allow clearance for vertical movement of the chamfered disk 24.
- the ramped cam engages the upper
- the ramped cam is rotated by a key which engages in a multi-lever lock,the key hole 26 for which is on the outside of the lid.
- the ramped cam is clear of the disk 24 and allows the spring bias of the coiled spring 19 to push the spindle 15 outwardly by a limited amount, say about 8 inch, (see Figure 3).
- the edge of the chamfered disk 24 is now higher than the bottom of the ramp on the cam but the blind gear is still engaged so that the lid is still firmly secured to the safe.
- FIG. 6 to 9 An embodiment including such a mechanism is illustrated in Figures 6 to 9.
- the disk 24 is replaced by a disk 24a to the top of which is fixed a small peg 31 which protrudes 1.5mm from the top surface of the disk 24a.
- the ramped cam 25 is replaced by an escapement member 32 which pivots about a spindle 33.
- This member 32 is shown in detail in Figure 9 , from which it will be seen that the member 32 has a generally triangular shape, the pivotal axis 33 for which is near the vertex. At the other side from the axis the member is cut away centrally to reduce weight and also to leave two peninsulars 34 which are further away from the axis 33 than any other part of the member 32. The peninsulars are further cut away.
- the head 16 must first be depressed against the resilience of the spring 19 by about 2mm to release the peg 31 so that the member 32 can be pivoted clockwise by a relocking action of the lock 26.
- the upper peninsular 34b then moves out of the way of the disk 24a to enable the disk to rise to the maximum height permitted by the spring 19 so that the gears 13 and 14 are engaged to enable rotation to the spindle 15 to unlock the bolts 11.
- the lower peninsular 34a does not obstruct the disk 24a in its upward movement on the re-locking action as it moves into a position which is underneath the disk.
Landscapes
- Lock And Its Accessories (AREA)
Abstract
A locking device, particularly suitable for use in the lid or door of a safe, comprises a first locking mechanism which extends and retracts bolts, and a second locking mechanism which acts to lock the first locking mechanism. The second locking mechanism is actuable in stages by sequence of key operations in an externally accessible lock. For extra protection an obstruction may be included which requires a further operation to be carried out simultaneously with one of the key operations. In one embodiment the first locking mechanism comprises a set of bolts which each carry a toothed gear wheel, and a central gear wheel which meshes therewith. The second locking mechanism comprises a blind gear mounted co-axially with the central gear wheel and means for moving the gears along the axis to select the central or blind gear to open or lock the first locking mechanism.
Description
- The present invention relates to locking devices which are particularly but not exclusively suitable for use in the lid or door of an underfloor safe.
- At the present time houses, cars and safes are particularly vulnerable to forceable entry, and devices that can hamper or prevent such entry are in great demand. In particular safes of heavy construction, such as underfloor safes, are usually set in heavy concrete, or otherwise firmly secured so that the only place that is vulnerable to an unauthorised attempt at entry is the lid or door. The present invention seeks to provide a tamper resistant locking mechanism that would be suitable for such use.
- According to the present invention there is provided a locking device comprising at least two bolts, each rotatable between an open and a closed position by a first locking mechanism, and a second locking mechanism adapted to lock the first locking mechanism against movement to retract the bolts, the second locking mechanism beingreleasable by a sequence of at least two operations.
- Advantageously the second locking mechanism is actuable to disengage by an unlocking action of an externally accessible lock, followed by a relocking action of the same lock.
- Preferably the first locking mechanism comprises a first gear wheel on each of the bolts, which gear wheels mesh with a single second gear wheel. The second locking mechanism may include a blind gear wheel which is moveable into engagement with the said first gear wheels to prevent the said first gear wheels turning to retract the bolts. The blind gear has sufficient cogs to mesh with the first gear wheels, but insufficient cogs to enable the wheels to be rotated to retract the bolts. ADvantageously the second locking mechanism includes means for locking the blind gear in engagement with the said first gear wheels including at least one externally accessible lock, in such a way that if an external lock is broken the blind gear remains in engagement with the first gears and the bolts cannot be retracted.
- Each accessible lock is advantageously connected to rotate an inclined cam face which is adapted to be located above or below a disk mounted co-axially with the second gear. The inclined cam may have a gap so that it can be rotated out of the path of the said disk to enable the disk to move freely along its axis. In such an arrangement the disk is spring biassed towards the upward position by a limited amount. Alternatively the inclined cam face can be part of a large screw so that it can move the disk by itself up and down the axis.
- In an alternative arrangement the ramped cam is replaced with an escapement mechanism and the central spring has a longer travel. In this design the central spring provides sufficient thrust to lift the spindle to engage the first and second gear wheels. The escapement arms control the upward movement travel of the central spindle in two stages using a sequence of key operations.
- The invention will now be described, by way of example, with reference to the accompanying drawings in which:-
- Figure 1 is a plan view of a safe lid incorporating a locking device according to the present invention.
- Figure 2 is a section through the lid of Figure 1 showing the locking device in its half locked position,
- Figure 3 is an identical section to that of Figure 2 showing a further step in the locking action,
- Figure 4 shows the same section again with the device in the fully locked position, and
- Figure 5 is a detail illustrating the blind gear in engagement with the three bolt locking gears.
- Figure 6 is a section through the lid of a second embodiment showing the locking device in its locked position,
- Figure 7 is a section through the lid of Figure 6 showing the locking device in its half-locked position,
- Figure 8 is a section through the lid of Figure 6 showing the locking device with the second mechanism unlocked, and
- Figure 9 is a plan view of the escapement member of the second embodiment.
- The locking device illustrated in the drawings comprises three
bolts 11 shaped as shown in the drawings and each being rotatable on itsown spindle 12 through approximately 90°. Each of thesebolts 11 has attached thereto on its upper surface concentric with the gear wheel amulti-toothed gear wheel 13. The threebolts 11 when extended engage under a flange on the safe body and prevent the removal of the door orlid 10. The threegear wheels 13 are engageable with acentral gear 14 which is mounted on acentral spindle 15. The outer end of thespindle 15 is provided with ahead 16 which is indented at 17 so that the spindle can be turned from the outside of the safe by a screw driver or by a special key or device. When the spindle is rotated through a sufficient angle, thecentral gear wheel 14 turns, which simultaneously rotates thegear wheels 13, thus moving the threebolts 11 into or out of engagement to lock or unlock the safe. To prevent tampering with thegear wheels 13, the top of eachspindle 12 on which agear wheel 13 is mounted has a layer oftungsten carbide 18. The system ofco-operating gear wheels - In order to prevent the central spindle from being rotated to disengage the bolts by an unauthorised person, a second locking mechanism is provided, which locks the first locking mechanism. This second locking mechanism involves a limited axial movement of the
spindle 15 inwardly against an outward bias from a coiledspring 19. Thespring 19 sits in abore 20 at the inner end of the spindle -15 and engages in a seating 21 in the bottom of thebore 22 of thesafe lid 10 which contains the central spindle and its appendages. - The inward axial movement of the spring enables the
gearwheel 14 to be moved out of engagement with thegears 13 and brings into engagement with gears 13 a partial or blind gear 23 (see Figure 5) which is mounted on thespindle 15 concentrically with thegear wheel 14 and slightly above that gear wheel. Theblind gear 23 is adapted to engage the threegear wheels 13 when the central spindle is pushed inwardly into thebore 22. Thecentral gear 14 is pushed out of engagement with the threegears 13 as can be seen in Figure 3. Engagement of the threegears 13 with theblind gear 23 both prevents the bolts from being rotated on their own spindles and also prevents the central spindle being turned. - Also mounted on the
central spindle 15 is adisk 24 which is flat on top and chamfered on the underside which is inward of the lid. All three items, thedriving gear 14 , theblind gear 23 and thedisk 24 are concentric on thecentral spindle 15 and of equal diameter. In the lid adjacent to thedisk 24 there is at least one rampedcam 25, in essence rather like part of a helter-skelter, but mounted on a spindle to be rotateable. A portion of the upper surface is flat and the under surface is flat. The ramp portion of thecam 25 extends from the top to the bottom over an angle of approximately 180°. Part of the cam is cut-away to allow clearance for vertical movement of thechamfered disk 24. The ramped cam engages the upper - side of the
disk 24 when the second locking mechanism is fully locked, to keep the blind gear in engagement with the threegears 13. - When the safe is locked the
central disk 24, thespindle 15 and theconcentric gears disk 24, the main drive has been disengaged and theblind gear 23 is engaged. In this position the bolts cannot be moved. - To open the safe, the ramped cam is rotated by a key which engages in a multi-lever lock,the key hole 26 for which is on the outside of the lid. In the unlocked position the ramped cam is clear of the
disk 24 and allows the spring bias of the coiledspring 19 to push thespindle 15 outwardly by a limited amount, say about 8 inch, (see Figure 3). The edge of thechamfered disk 24 is now higher than the bottom of the ramp on the cam but the blind gear is still engaged so that the lid is still firmly secured to the safe. If the ramped cam is now returned to the locked position by rotating it in the opposite position by means of the key in the lock 26, the ramp will engage the underside of the chamfered disk and rotation of the cam will raise the central spindle far enough to disengage theblind gear 23 and engage thedriving gear 14. - Using the special key or screw driver in the
indentation 17, the central spindle is then rotated until thebolts 11 are retracted and the safe is unlocked. The lid may now be removed. - To relock the safe, the
central spindle 15 is rotated until thebolts 11 engage under the flange of the safe body. The ramped cam is rotated to the unlocked position in which the spindle can be depressed against thespring 19 to a position below the cam and thecam 25 is then returned to the locked position, by a key in the lock 26, in which the underside of the cam engages over the top of thedisk 24. This re-engages theblind gear 23. - Any attempt to open the mechanism by tampering with the lock 26 will be self defeating since the lock must be closeable to operate the ramped cam mechanism which engages the
drive gear 14. up to three ramped cams could be provided, each actuated by a separate lock 26, thus making the time required to pick the locks very much greater; and of course to manipulate them all into the closed position, should this be known to be required, would take very much longer still. - The same sequence of operations to release the second locking mechanism, unlocking and re-locking the same set of locks,can be used in other embodiments. For example the cams could be relaced by an escapement mechanism.
- An embodiment including such a mechanism is illustrated in Figures 6 to 9. The
disk 24 is replaced by a disk 24a to the top of which is fixed asmall peg 31 which protrudes 1.5mm from the top surface of the disk 24a. The rampedcam 25 is replaced by anescapement member 32 which pivots about a spindle 33. Thismember 32 is shown in detail in Figure 9 , from which it will be seen that themember 32 has a generally triangular shape, the pivotal axis 33 for which is near the vertex. At the other side from the axis the member is cut away centrally to reduce weight and also to leave two peninsulars 34 which are further away from the axis 33 than any other part of themember 32. The peninsulars are further cut away. Theright hand peninsular 34a is cut away on top and the left hand one 34b from below so as to provide escapement arms at different operative heights. The bottom of theleft hand peninsular 34b is about 5mm higher than the top of theright hand peninsular 34a. At an appropriate distance from the axis 33 and on its inner side theleft hand peninsular 34b is cut away to provide anotch 36 which engages thepeg 31 when thepeninsular 34b is over the disk 24a. Although reference is made above to various parts being "cut away", in fact theescapement member 32 will be formed in one piece as a casting. - The
member 32 is pivoted about the spindle 33 by movement of a lockingarm 37 as a result of operation to unlock and re-lock the lock 26. Thearm 37 is moved by the engagement of a hook (not shown) in aslot 38 in thearm 37. The said hook is fitted into the end of a mortice bolt of the lock 26, the travel of which is about 10mm. The stages of unlocking the safe are illustrated in Figures 6 to 9. - In Figure 6, which is the locked position, the right hand peninsular 34a.is over the disk 24a and holds the disk down against the force of the
spring 19. When the lock 26 is rotated to the unlocked position thearm 37 moves themember 32 anticlockwise. As theright hand peninsular 34a pivots off the top of the disk 24a the disk is raised by thespring 19. However the rise is limited because theleft hand peninsular 34b moves at the same time to a position above the disk 24a and thepeg 31 becomes seated in thenotch 36. Themember 32 cannot be pivoted out of the rising path of the disk 24a while thepeg 31 is engaged in thenotch 36. Thehead 16 must first be depressed against the resilience of thespring 19 by about 2mm to release thepeg 31 so that themember 32 can be pivoted clockwise by a relocking action of the lock 26. Theupper peninsular 34b then moves out of the way of the disk 24a to enable the disk to rise to the maximum height permitted by thespring 19 so that thegears spindle 15 to unlock thebolts 11. Thelower peninsular 34a does not obstruct the disk 24a in its upward movement on the re-locking action as it moves into a position which is underneath the disk. - This system forms an added protection against the burglar as it would be necessary to apply pressure to the
head 16 to hold thepeg 31 out of engagement with thenotch 36 for the whole time that the lock is being picked to reclose it. - For still further protection the top disk is hollowed out and refilled with
copper 40 into which is incorporated artificial diamonds in the form of zirconia which is caste into the copper. This provides an extra resistance against drilling.
Claims (14)
1. A locking device comprising at least two bolts, each moveable between an open and a closed position by a first locking mechanism, and a second locking mechanism adapted to lock the first locking mechanism against movement to retract the bolts, the second locking mechanism including an externally accessible lock and being releaseable by a sequence of at least two operations.
2. A locking device according to claim 1 characterised in that the second locking mechanism is actuable to disengage by an unlocking action of the lock followed by a relocking action of the same lock.
3. A locking device according to claim 1 or 2 characterised in the second locking mechanism includes a further hindrance to unauthorised opening creating an added operation in the opening of the lock, which is to be carried out at the same time as at least one of the operations of said sequence of operations.
4. A locking device according to any of the preceding claims characterised in that the first locking mechanism comprises a first gear wheel on each of the bolts, and a single second gear wheel meshing with the first gear wheels, the first locking mechanism being actuable by rotation of the second gear wheel.
5. A locking device according to claim 4 characterised in that the second locking mechanism includes a blind gear wheel which is moveable into engagement with the first gear wheels to prevent the first gear wheels turning to retract the bolts.
6. A locking device according to claim 5 characterised in that the blind gear wheel and the second gear wheel are located on the same spindle, the axial position of which spindle is adjustable to engage selectively the second gear wheel or blind gear wheel with the first gear wheels.
7. A locking device according to claim 6 characterised in that the second locking mechanism includes a member on the spindle and means for restraining the member to lock the axial position of the spindle in which the first gear wheels are engaged with the blind gear wheel.
8. A locking device according to claim 7 characterised in that the spindle is held in the locked position against a spring bias.
9. A locking device according to claim 8 characterised in that the second locking mechanism includes an element which engages above the member in the locked position and the second locking mechanism is unlocked by first moving the element out of the path of the member to allow the spindle to move axially under the influence of the spring bias, and then further moving the member and spindle along the axis by engagement underneath the member, the first and second gears only being in mutual engagement after the second operation.
10. A locking device according to claim 8 characterised in that the second locking mechanism includes two escapement arms at different positions with respect to the said axis, and pivotable into and out of the path of the said member; the said two operations causing firstly a first said escapement arm to move out of the path of the member and at the same time a second said escapement arm to move into the path of the member at a point axially spaced from the first arm, and secondly the second said arm to move out of the path of the member so that the spindle can be moved to a position in which the first and second gears are engaged.
11. A device according to claim 10 characterised in that the member and the second escapement arm comprise cooperating portions whereby said second operation cannot be completed unless the said cooperating portions are disengaged while the second operation is being performed.
12. A device according to any of the preceding claims characterised in that one or more component incorporates a matrix of copper and artificial diamonds.
13. A locking device substantially as herein described with reference to the accompnaying drawings.
14. A safe incorporating a lid having a locking device according to any of the preceding claims.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8225934 | 1982-09-10 | ||
GB8225934 | 1982-09-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0103429A2 true EP0103429A2 (en) | 1984-03-21 |
EP0103429A3 EP0103429A3 (en) | 1984-09-05 |
Family
ID=10532842
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83304874A Ceased EP0103429A3 (en) | 1982-09-10 | 1983-08-24 | Locking device |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0103429A3 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITGE20090025A1 (en) * | 2009-04-27 | 2009-07-27 | Carpenteria Bozzano Di Bozzano Nico Lo G B E C | OPENING / CLOSING MECHANISM OF A FIRE RESISTANT DOOR |
CN112951644A (en) * | 2021-02-25 | 2021-06-11 | 星凯电气有限公司 | Switch board isolating switch locking device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE115625C (en) * | ||||
GB191401910A (en) * | 1913-02-22 | 1914-08-27 | Pierre Reynier | Improvements in and relating to Fastening Devices. |
GB2084238A (en) * | 1980-09-26 | 1982-04-07 | Secure Safes Coventry Ltd | Fastening for safe door |
-
1983
- 1983-08-24 EP EP83304874A patent/EP0103429A3/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE115625C (en) * | ||||
GB191401910A (en) * | 1913-02-22 | 1914-08-27 | Pierre Reynier | Improvements in and relating to Fastening Devices. |
GB2084238A (en) * | 1980-09-26 | 1982-04-07 | Secure Safes Coventry Ltd | Fastening for safe door |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITGE20090025A1 (en) * | 2009-04-27 | 2009-07-27 | Carpenteria Bozzano Di Bozzano Nico Lo G B E C | OPENING / CLOSING MECHANISM OF A FIRE RESISTANT DOOR |
CN112951644A (en) * | 2021-02-25 | 2021-06-11 | 星凯电气有限公司 | Switch board isolating switch locking device |
CN112951644B (en) * | 2021-02-25 | 2023-02-28 | 星凯电气有限公司 | Switch board isolating switch locking device |
Also Published As
Publication number | Publication date |
---|---|
EP0103429A3 (en) | 1984-09-05 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
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AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
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17P | Request for examination filed |
Effective date: 19841030 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: LIONWELD LIMITED |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
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18R | Application refused |
Effective date: 19861026 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: FRASER, JAMES EDWARD |