EP1127206B1 - Latch mechanism and latch assembly - Google Patents
Latch mechanism and latch assembly Download PDFInfo
- Publication number
- EP1127206B1 EP1127206B1 EP99954108A EP99954108A EP1127206B1 EP 1127206 B1 EP1127206 B1 EP 1127206B1 EP 99954108 A EP99954108 A EP 99954108A EP 99954108 A EP99954108 A EP 99954108A EP 1127206 B1 EP1127206 B1 EP 1127206B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- striker
- detent
- latch mechanism
- latch
- pawl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B85/00—Details of vehicle locks not provided for in groups E05B77/00 - E05B83/00
- E05B85/20—Bolts or detents
- E05B85/24—Bolts rotating about an axis
Definitions
- the present invention relates to latch mechanisms and latch assemblies for use in closing doors and the like.
- the present invention relates to latch assemblies and latch mechanisms used in conjunction with vehicle doors.
- Known latch assemblies use a rotating claw mounted on a door, which when closed contacts a striker which causes the claw to rotate in a first direction and secure the door in a closed position. Rotation of the claw in the opposite (second) direction is prevented by a pawl directly engaging notches on the claw. The door can be subsequently opened by moving the pawl out of engagement with the notches and thus allowing the claw to rotate in the second direction and release the striker.
- latch assemblies require a relatively high force to release the pawl from the claw notch. Also such claws are mounted at the back of the vehicle door and are exposed. Such an arrangement makes it difficult to properly seal the area via door seals which necessarily have to be of complicated shape and therefore expensive.
- a latch assembly 10 including a latch mechanism 12 and a striker bar 14.
- Striker bar 14 is of uniform thickness T and includes securing holes 16 (in this case two holes) used to secure the striker bar 14 to an adjacent component such as a door or B or C post of a vehicle.
- the profile of the striker bar 14 includes first and second teeth (18 and 20). Each tooth has a respective ramp portion (18A and 20A) and an abutment portion (18B and 20B). Striker bar also has a support surface 22.
- the latch mechanism 12 includes a cover plate 30 and a retention plate 32, held in spaced apart relationship by spacers 34 and 36.
- Each plate (30 and 32) includes securing holes 38 which align with appropriate spacers 34 and 36 to allow a fastener to secure the latch mechanism to a door.
- Guide member 40 includes a membrane (not shown) which lies substantially parallel and against the inner face of retention plate 32.
- the membrane conveniently includes holes through which the first pivot pin 46 and the second pivot pin 62 can pass thus securing the guide member 40 in position.
- Guide member 40 includes guides 41 and 42 which are upstanding from the surface of the membrane.
- Guide 41 includes an abutment 41A.
- a latching detent 44 is pivotally mounted on a first pivot pin 46.
- First pivot pin 46 is supported at one end by cover plate 30 and at the other end by retention plate 32.
- Detent 44 is of constant thickness U and includes a latch tooth 48 having a latching abutment surface 50 and a camming surface 52.
- the detent further includes a first abutment surface 54, a second abutment surface 56 and a pawl stop 58.
- a pawl 60 is pivotally mounted on a second pivot pin 62 which in turn is supported at one end by cover plate 30 and at the other end by retention plate 32.
- Pawl 60 includes a first arm 64 with a first abutment surface 66 and a second arm 68 with a second abutment surface 70.
- a control member 72 is also pivotally mounted on first pivot pin 46.
- a major flat part of member 72 lies behind detent 44 and pawl 60 when viewing Figure 3.
- Member 72 includes a slot 72A (shown dotted in figure 3) to enable the second pivot pin 62 to pass through the member to engage the cover plate 30 and also to allow pivotal movement of the control member 72 about the first pivot 46 (see below).
- Member 72 also has a laterally projecting formation 73 at its distal end providing a first camming surface 74 and a second camming surface 76 which co-act with the pawl 60 and striker bar 14 respectively.
- Spring 61 (shown diagrammatically in figures 3 and 4) is located between the membrane portion of guide number 40, the guides 41 and 42 and the control member 72.
- One end of the spring 61 acts to bias pawl 60 in a clockwise direction about the second pivot pin 62 and the other end of spring 61 acts to bias control member 72 in a clockwise direction about the first pivot pin 46 by contact with stop pin 77 of control member 72.
- Stop pin 77 acts on detent 44 to bias it in a clockwise direction about first pivot pin 46.
- Such clockwise biasing of detent 44 is resisted by contact between first abutment surface 54 and abutment 41A.
- ends of the first and second pivot pins 46,62 can be formed by peening methods or the like to secure the cover plate 30 to the retention plate 32.
- Figure 3 shows the latch assembly 10 in a door open condition since the latch mechanism 12 is free to move in a closing direction A or an opening direction B and is not restrained by the striker bar 14.
- Detent 44 is biased to a first position wherein its first abutment 54 is in contact with the guide abutment 41A.
- Member 72 is biased to a first position wherein a stop abutment (in this case the top of slot 72A) contacts a stop abutment (in this case second pivot pin 62) of the assembly.
- Pawl 60 is biased into a first position wherein first arm 64 contacts pawl stop 58 of detent 44.
- Figures 4 to 7 show a progressive engagement of the latch mechanism with the striker on closing the door.
- member 72 has been caused to rotate anti-clockwise by its second camming surface 76 riding up the first tooth ramp 18A.
- This movement of member 72 causes its first camming surface 74 to contact the second abutment surface 70 of pawl 60 resulting in the pawl 60 rotating in an anti-clockwise direction against the action of spring 61 to a second position.
- the first abutment surface 66 of the pawl no longer contacts the second abutment surface 56 of the detent, and also the first arm 64 no longer abuts the pawl stop 58 of the detent 44.
- the detent can rotate in an anti-clockwise direction when its camming surface 52 contacts the first tooth ramp 18A.
- Figure 5 shows the latch in a first safety condition with the latch tooth 48 and second camming surface 76 of member 72 being positioned between the first tooth 18 and second tooth 20 of the striker bar 14.
- the detent, pawl, and control member are all in their first positions and in particular the detent 44 is blocked from moving by first abutment surface 66 of pawl 60 and therefore movement of the latch mechanism 12 in an opening direction B is prevented by first tooth abutment 18B contacting latching abutment surface 50 of detent 44.
- Figure 7 shows the latch mechanism in a fully latched position holding the door closed, movement of the latch mechanism in an opening direction B being prevented by the engagement of second tooth abutment 20B and latching abutment surface 50.
- Figure 8 shows the latch assembly in a release condition to allow the door to open.
- Member 72 has been rotated to its second position by a release means (not shown) connected to for example a door handle and/or power actuator(not shown), in turn displacing pawl 60 to its second position.
Landscapes
- Lock And Its Accessories (AREA)
Description
Claims (16)
- A latch mechanism (12) having a detent (44), a retention plate (30) and a striker aperture, the detent being for engagement with a striker (14) whilst positioned within the striker aperture with the detent being moveable between a first position at which it is capable of retaining a striker in the striker aperture and a second position at which a striker can be withdrawn from the striker aperture, characterised in that a striker support (36) is mounted between a cover plate (30) and the retention plate (32) to define the striker aperture and in that the detent is mounted between the retention plate and the cover plate.
- A latch mechanism as defined in Claim 1 including a pawl (60) moveable between a first and second position and a control member (72) moveable between a first and second position, the pawl in the first position blocking displacement of the detent from its first position to latch the mechanism and in the second position allowing the detent to move to its second position to release the latch from engagement with a striker, the control member in the first position allowing the pawl to move between its first and second positions and in the second position placing the pawl in it its second position.
- A latch mechanism as defined in Claim 2 in which at least one of the detent, pawl or control member is pivotally mounted between the retention plate and cover plate.
- A latch mechanism as defined in Claim 3 in which the pivot axis of the detent is co-axial with the pivot axis of the control member.
- A latch mechanism as defined in Claim 3 or Claim 4 in which the detent is pivotally mounted about a pivot pin, the pivot being supported in the cover plate and the retention plate.
- A latch mechanism as defined in Claims 2 to 5 in which the detent is biased to its first position by a first resilient means.
- A latch mechanism as defined in Claims 2 to 6 in which the pawl is biased into its first position by a second resilient means.
- A latch mechanism as defined in Claims 2 to 7 in which the control member is biased into its first position by a third resilient means.
- A latch mechanism as defined in Claims 2 to 8 in which a resilient means (61) acts to bias at least two of the detent and pawl and control member into respective first positions.
- A latch mechanism as defined in any preceding claim in which the striker support acts to space the cover plate from the retention plate.
- A latch mechanism as defined in any preceding claim in which the striker support is fixed relative to the cover plate and retention plate.
- A latch assembly including a latch mechanism defined in any preceding Claim the latch assembly further including a co-acting striker (14).
- A latch assembly as defined in Claim 12 in which the striker is in the form of a profiled flat bar.
- A latch assembly as defined in Claim 12 or 13 in which the control member is moved from its first position to its second position by contact with a formation or formations (18, 20) of the striker which are also engaged by the detent.
- A vehicle including a latch assembly as defined in Claims 12 to 14, the latch mechanism being mounted on a door of the vehicle, the striker projecting from fixed structure of the vehicle, in which when the door is closed the striker extends into the striker aperture such that a portion of the door surrounding the striker aperture and the portion of fixed structure surrounding the striker are in face to face relationship.
- A vehicle as defined in Claim 15 in which when the striker is engaged with the latch mechanism, a latching abutment of the detent co-operates with an abutment of the striker to prevent disengagement of the striker from the latch mechanism and when a force is applied to the assembly to disengage the striker from the latch mechanism the co-operating abutments generate a force which acts to move the detent towards it second position.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9823700A GB2343217A (en) | 1998-10-30 | 1998-10-30 | Bolt mechanism with latching detent |
GB9823700 | 1998-10-30 | ||
PCT/GB1999/003593 WO2000026490A1 (en) | 1998-10-30 | 1999-10-29 | Latch mechanism and latch assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1127206A1 EP1127206A1 (en) | 2001-08-29 |
EP1127206B1 true EP1127206B1 (en) | 2003-06-25 |
Family
ID=10841517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99954108A Expired - Lifetime EP1127206B1 (en) | 1998-10-30 | 1999-10-29 | Latch mechanism and latch assembly |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1127206B1 (en) |
DE (1) | DE69909119T2 (en) |
GB (1) | GB2343217A (en) |
WO (1) | WO2000026490A1 (en) |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1125809B (en) * | 1955-07-22 | 1962-03-15 | Friedrich Wilhelm Kiekert | Motor vehicle door lock |
DE1142525B (en) * | 1958-08-12 | 1963-01-17 | Friedrich Wilhelm Kiekert | Motor vehicle door lock |
DE1139771B (en) * | 1958-08-26 | 1962-11-15 | Friedrich Wilhelm Kiekert | Motor vehicle door lock |
GB953052A (en) * | 1959-07-03 | 1964-03-25 | Wilmot Breeden Ltd | Door fastenings |
GB1400006A (en) * | 1971-08-14 | 1975-07-16 | Bolton Gate Co Ltd | Improvements in or relating to locks |
FR2355146A1 (en) * | 1976-06-17 | 1978-01-13 | Dubois & Cie | Vehicle swinging door lock with fixed bolt and keeper - with spring-loaded stay-forming catch in recess |
GB2142078B (en) * | 1983-06-23 | 1986-10-01 | Wilmot Breeden Ltd | Electrically-operated vehicle door latch |
GB2162234B (en) * | 1984-07-25 | 1988-06-08 | Bloxvich Lock Stamping | Releasable fastening mechanism for vehicle tilting cabs, bonnets or boots |
GB8528445D0 (en) * | 1985-11-19 | 1985-12-24 | Taylor A M | Door locks |
-
1998
- 1998-10-30 GB GB9823700A patent/GB2343217A/en not_active Withdrawn
-
1999
- 1999-10-29 WO PCT/GB1999/003593 patent/WO2000026490A1/en active IP Right Grant
- 1999-10-29 DE DE69909119T patent/DE69909119T2/en not_active Expired - Fee Related
- 1999-10-29 EP EP99954108A patent/EP1127206B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
GB9823700D0 (en) | 1998-12-23 |
EP1127206A1 (en) | 2001-08-29 |
DE69909119D1 (en) | 2003-07-31 |
WO2000026490A1 (en) | 2000-05-11 |
GB2343217A (en) | 2000-05-03 |
DE69909119T2 (en) | 2004-05-13 |
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