EP2631399A2 - Fallenanordnung und Fallenbolzen - Google Patents

Fallenanordnung und Fallenbolzen Download PDF

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Publication number
EP2631399A2
EP2631399A2 EP13155307.5A EP13155307A EP2631399A2 EP 2631399 A2 EP2631399 A2 EP 2631399A2 EP 13155307 A EP13155307 A EP 13155307A EP 2631399 A2 EP2631399 A2 EP 2631399A2
Authority
EP
European Patent Office
Prior art keywords
head assembly
latchbolt
casing
assembly
head
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.)
Withdrawn
Application number
EP13155307.5A
Other languages
English (en)
French (fr)
Inventor
Roger Mervyn Bentley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Assa Abloy Ltd
Original Assignee
Assa Abloy Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Assa Abloy Ltd filed Critical Assa Abloy Ltd
Publication of EP2631399A2 publication Critical patent/EP2631399A2/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B63/00—Locks or fastenings with special structural characteristics
    • E05B63/0065—Operating modes; Transformable to different operating modes
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B63/00—Locks or fastenings with special structural characteristics
    • E05B63/08—Mortise locks
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B15/00—Other details of locks; Parts for engagement by bolts of fastening devices
    • E05B15/10—Bolts of locks or night latches
    • E05B15/102—Bolts having movable elements
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B63/00—Locks or fastenings with special structural characteristics
    • E05B63/22—Locks or fastenings with special structural characteristics operated by a pulling or pushing action perpendicular to the front plate, i.e. by pulling or pushing the wing itself
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B65/00—Locks or fastenings for special use
    • E05B65/10—Locks or fastenings for special use for panic or emergency doors
    • E05B65/102—Locks or fastenings for special use for panic or emergency doors opening under pressure on the surface of the door itself
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C19/00—Other devices specially designed for securing wings, e.g. with suction cups
    • E05C19/02—Automatic catches, i.e. released by pull or pressure on the wing
    • E05C19/028—Automatic catches, i.e. released by pull or pressure on the wing with sliding bolt(s)

Definitions

  • This invention relates generally to a latch assembly and to a latchbolt for use in such an assembly.
  • Such latch assemblies may be used on their own or in combination with a locking assembly, for example a mortise lock assembly.
  • a latchbolt is movable between an extended position in which a head of the latchbolt projects out of a casing through an opening in the casing, and a retracted position in which the head of the latchbolt is contained at least substantially within the casing.
  • the latchbolt is spring biased into its extended position and is chamfered so that a first side face of the bolt extends outwardly in a plane at about 45 degrees to the direction of movement of the latchbolt between the retracted and extended positions while a second side face opposite the first extends outwardly in a plane parallel to the direction of movement of the latchbolt.
  • a handle mechanism is provided for moving the latchbolt from the extended position to the retracted position against the spring bias.
  • the latchbolt When the latchbolt is in its extended position and is retained in a keeper, the latchbolt is arranged with the second side face lying adjacent to an approximately parallel side face of the keeper; that side face of the keeper prevents movement of the latchbolt head in a direction towards the side face of the keeper, unless or until the latchbolt is moved into its retracted position.
  • the latch assembly is moved from a position outside the keeper towards the keeper with the first inclined side face of the latchbolt head cammingly engaging an external face of the keeper, then, by virtue of the inclination of the first side face, the latchbolt is moved into its retracted position (without operation of the handle) until the latchbolt head becomes aligned with an opening in the keeper and is free to move into its extended position in the keeper.
  • a latch assembly of the kind described above has been known for many years and many modifications and enhancements of the design have been proposed and in some cases implemented.
  • the latchbolt it is not desired for the latchbolt to prevent movement of the bolt out of the keeper when a force above a threshold level is applied.
  • This simple arrangement can be useful but is of limited flexibility: for example, the force required to move the ball back into the retracted position depends upon which part of the ball the keeper makes contact with, so that the clearance between the keeper and the casing of the latch assembly can significantly affect the operation of the latch assembly. Also the force required to move the ball into the retracted position when the ball is leaving the keeper cannot be controlled separately from the force required when the ball is moving back into the keeper.
  • the present invention seeks to mitigate the above-mentioned problems. Alternatively or additionally, the present invention seeks to provide an improved latch assembly and latchbolt for use in such an assembly.
  • a latch assembly comprising a casing and a latchbolt mounted in the casing, the latchbolt including a head assembly movable between an extended position in which the head assembly projects out of the casing through an opening in the casing, and a retracted position in which the head assembly is contained at least substantially within the casing, the head assembly being biased toward the extended position, wherein
  • the head assembly of the latchbolt is biased into a first condition in which it is able to operate as a conventional chamfered latchbolt, the head assembly being cammed from the extended position into the retracted position when a first side of the latchbolt head assembly is subjected to a lateral force in a first direction and the head assembly being resistant to being cammed from the extended position into the retracted position when a second side of the latchbolt head assembly, opposite to the first side, is subjected to a lateral force in a second direction opposite to the first direction, and the head assembly of the latchbolt is able to be transformed against the bias into a second condition in which the head assembly is cammed from the extended position into the retracted position when the second side of the latchbolt head assembly is subjected to the lateral force in the second direction.
  • the latchbolt may operate in the first condition of its head assembly in very much the same way as the conventional latchbolt described above, but, when the head assembly is transformed into the second condition, it may allow movement of the latchbolt out of a keeper without the need for a separate operation of a handle. Consequently, there is no need for a handle to be provided for retracting the latchbolt. That may be of particular advantage when the latch assembly is provided in a door of a prison cell.
  • a lateral force applied to the head assembly in the second direction is effective to transform the head assembly of the latchbolt from the first condition to the second condition.
  • a lateral force may be automatically generated by a user pressing the head assembly against a keeper.
  • the head assembly has a shape corresponding substantially to a latch head chamfered on one side in the first condition and a shape corresponding substantially to a latch head chamfered on its opposite side in the second condition.
  • the angle of chamfering may in each case be approximately 45°.
  • the head assembly preferably comprises a first part providing the cam surface on the first side of the assembly and capable of receiving the lateral force in the first direction to cam the head assembly from the extended position into the retracted position, and a second part providing the cam surface on the second side of the assembly and capable of receiving the lateral force in the second direction opposite to the first direction, the second part being movably mounted on the first part.
  • the head assembly preferably further comprises a spring biasing the second part into a position corresponding to the first condition of the head assembly. The level of the spring bias affects the force required to transform the head assembly from the first condition into the second condition and therefore affects the force required to open a door on which the latch assembly is mounted.
  • the second part is preferably pivotally mounted on the first part for pivotal movement about an axis transverse to the direction of movement of the head assembly between the retracted and extended positions and substantially parallel to said first and second directions.
  • the spring is preferably a torsion spring.
  • a latch assembly is able to present a chamfered face on either of its two opposite sides according to whether it is in the first condition or the second condition.
  • a latch assembly comprising a casing and a latchbolt mounted in the casing, the latchbolt including a head assembly movable between an extended position in which the head assembly projects out of the casing through an opening in the casing, and a retracted position in which the head assembly is contained at least substantially within the casing, the head assembly being biased toward the extended position, wherein the head assembly of the latchbolt is biased into a first condition in which it has a shape corresponding substantially to a latch head chamfered on one side, and is able to be transformed against the bias into a second condition in which it has a shape corresponding substantially to a latch head chamfered on its opposite side.
  • the latch bolt is preferably resiliently biased towards the extended position by a spring.
  • the spring is preferably a compression spring.
  • the latch assembly preferably further comprises a locking bolt movable between an extended position in which a head of the locking bolt projects out of the casing through an opening in the casing, and a retracted position in which the head of the bolt is contained at least substantially within the casing.
  • movement of the locking bolt is effected by a manually operable key.
  • the latch assembly may be a mortise lock assembly. The provision of a locking bolt enables a secure latch assembly to be provided.
  • a latch bolt suitable for use in a latch assembly as defined above, the latch bolt comprising a head assembly having any one or more of the features defined above.
  • the latchbolt generally comprises a rear part 1 and a head assembly 2 comprising a first part 3 fixed to the rear part 1 and a second part 4 pivotally mounted on the first part 3 by a pin 5.
  • the pin 5 passes through a pair of apertures in the part 3 and passageways 7 in a pair of lugs on the part 4.
  • a torsion spring 8 is carried on the pin 5 and spring biases the part 4 to the orientation shown in Fig. 3 .
  • a compression spring 9, schematically shown in Fig. 1 biases the latchbolt outwardly (to the left as seen in Fig. 1 ).
  • the spring 9 acts between a fixed part of the casing of the assembly and the rear of the latchbolt.
  • the head assembly 2 is in its first condition and the latchbolt operates in the manner of a conventional chamfered latch and indeed, as can be seen in Fig. 3 , the shape of the latchbolt is that of a conventional chamfered latch.
  • the latchbolt is moved inwardly into the casing.
  • the part 4 is shown pivoted only partway to its other position but it will be understood that, when fully pivoted, it provides an inclined plane comprising the flat face 10 on the part 4 and faces 12 on the part 3.
  • This is the second condition of the head assembly 2, in which the faces 10 and 12 are inclined and able to engage with the keeper and through a camming action with the keeper cause the latchbolt to be driven inwardly against the bias of the spring 9.
  • the casing is preferably also provided with a locking bolt opening for receiving a locking bolt (not shown).
  • the locking bolt is operated by a key and when the locking bolt is in an extended position in a keeper, the bolt retains the door in a closed position.
  • the force required to open the door when it is latched closed is determined partly by the stiffness of the torsion spring 8 and can be set to a greater force than the force required to move the latchbolt inwardly as the door is closed.
  • the invention may be applied to a wide variety of applications, not necessarily limited to doors. It may be of particular advantage for a door of a prison cell since it removes the need to provide a handle on the inside of the door for the purpose of operating the latchbolt.
  • the latchbolt described above may be supplied as part of a latch assembly or may be retrofitted to an existing latch assembly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP13155307.5A 2012-02-21 2013-02-14 Fallenanordnung und Fallenbolzen Withdrawn EP2631399A2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1202968.2A GB2499605A (en) 2012-02-21 2012-02-21 Latch assembly and latchbolt

Publications (1)

Publication Number Publication Date
EP2631399A2 true EP2631399A2 (de) 2013-08-28

Family

ID=45939949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13155307.5A Withdrawn EP2631399A2 (de) 2012-02-21 2013-02-14 Fallenanordnung und Fallenbolzen

Country Status (2)

Country Link
EP (1) EP2631399A2 (de)
GB (1) GB2499605A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109898928A (zh) * 2017-12-11 2019-06-18 上海英还实业有限公司 一体式斜舌机构及其门锁

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104948008B (zh) * 2015-07-24 2017-10-13 广西平果力保佳锁业有限责任公司 一种中控锁锁体

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4135746A (en) * 1977-02-17 1979-01-23 Sterling John G Latch bolt assembly
US4573333A (en) * 1983-08-19 1986-03-04 Choi Yoon H Electrical door lock
NL1034174C2 (nl) * 2007-07-23 2009-01-27 Nemef B V Schootbehuizing met een schoot, en een schootmodule.
SE531998C2 (sv) * 2008-02-01 2009-09-22 Assa Ab Lås med fallkolv

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109898928A (zh) * 2017-12-11 2019-06-18 上海英还实业有限公司 一体式斜舌机构及其门锁

Also Published As

Publication number Publication date
GB2499605A (en) 2013-08-28
GB201202968D0 (en) 2012-04-04

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