EP0042757A1 - Improvements relating to latch mechanisms - Google Patents
Improvements relating to latch mechanisms Download PDFInfo
- Publication number
- EP0042757A1 EP0042757A1 EP81302812A EP81302812A EP0042757A1 EP 0042757 A1 EP0042757 A1 EP 0042757A1 EP 81302812 A EP81302812 A EP 81302812A EP 81302812 A EP81302812 A EP 81302812A EP 0042757 A1 EP0042757 A1 EP 0042757A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bolt
- plate
- casing
- deadlatch
- mechanism according
- 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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Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B55/00—Locks in which a sliding latch is used also as a locking bolt
Definitions
- This invention is concerned with latch mechanisms such as those which are used on doors.
- the conventional door latch mechanism takes many forms and, where security is important the construction can be quite intricate.
- the conventional cylinder night-latch or lock mechanism incorporates a large number of parts requiring intricate assembly which cannot readily be mechanised.
- a latch mechanism comprising a casing within which is mounted a bolt which can slide from an extended position whereby it projects through the casing and a retracted position wherein it is at least partially withdrawn into the casing, a drive shaft for rotary operation by a cylinder lock mechanism and carrying a drive member which may be rotated by the drive shaft to drive the bolt linearly from one position to the other, and an operating handle projecting from the other side of the casing and linked with the bolt so as to move the bolt from one position to the other as the handle is slideably moved with respect to the casing.
- the drive member and operating handle act independently upon the bolt, so that the cylinder lock does not have to drive the handle.
- the drive member and the operating handle may independently engage a plate carrying the bolt.
- the drive member may be disposed to engage a pin projecting from the plate, whilst the operating handle is disposed to engage a flange projecting from the plate.
- the plate itself may incorporate a groove which will slide about the drive shaft as the bolt moves between its two positions. Also the bolt is ideally biased, such as by a spring, to the extended position.
- the invention provides a latch mechanism comprising a casing within which is mounted a bolt which can slide from an extended position whereby it projects through the casing and a retracted position wherein it is at least partially withdrawn into the casing, an operating handle projecting from the other side of the casing and linked with the bolt through a plate so as to move the bolt from one position to the other as the handle is slideably moved with respect to the casing, the plate having a slot receiving a rotatable catch formed, in the region of the slot, with a groove cut in the side of the catch, or a projection from the side of the catch, the slot providing a track extending in the direction of movement of the plate and notches extending at generally at right angles to the track such that, when the catch is in one attitude the track may slide about the formation of the catch, whilst the catch may be rotated to locate within one of the notches to prevent sliding of the plate.
- the rotatable catch can be of circular cross-section and be formed with a semi-circular groove therein, the notches having correspondingly shaped curved and flat faces.
- the catch should incorporate lugs which are a releasable snap fit into grooves in the body of the latch mechanism. These grooves will ideally be disposed to hold the catch either in said one attitude or in the condition where it is fully engaged with one of the notches.
- a still further aspect of the invention resides in a deadlatch mechanism comprising a casing within which are mounted a bolt and a deadlatch, both of which can slide from an extended position whereby they project through the casing and retracted positions wherein each is at least partially withdrawn into the casing, the bolt and deadlatch being carried by a respective bolt plate and deadlatch plate, the bolt plate being movable by an operating member between its two positions, the deadlatch mechanism also incorporating a bolt securing member which is held by the deadlatch plate out of contact with the bolt plate when the deadlatch is in the extended position but which is driven into locking engagement with a part of the bolt plate so as to prevent movement of the bolt to the retracted position when the bolt is extended and the deadlatch is in the retracted position, the operating member being operable to disengage the bolt securing member from the notch in the bolt plate.
- the bolt securing member could be a sliding member, it is preferred that it should take the form of a rotary member carrying first and second pins which can respectively engage with a notch in the bolt plate when the bolt is in the extended position and a notch in the deadlatch plate when the deadlatch is in the retracted position.
- the operating member can be positioned to be able to engage one of the pins to drive the first pin out of engagement with the notch of the bolt plate.
- the bolt securing member is biased into the position of locking engagement with the part of the bolt plate, such biasing means comprising a spring arm carried by the bolt securing member.
- the deadlatch itself is preferably biased into the extended position such as by a spring.
- a latch hold mechanism comprising a casing within which is mounted a bolt which can slide from an extended position whereby it projects through the casing and a retracted position wherein it is at least partially withdrawn into the casing, the bolt being carried by a plate incorporating a slot whose edge may be engaged by a notch at the end of a hold member, the hold member being biased to raise the notched end thereof free of the slot in the plate when the edge of the slot in the plate is disengaged from the notch, the hold member also incorporating an actuating portion which can be pressed against the bias to allow the notch to engage with the edge of the slot in the plate.
- the hold member is biased by integral spring-like arms thereof acting on part of the casing, and the actuating portion is a button extending through the casing.
- Retaining means may be included for preventing the hold member from being removed from the casing.
- This retaining means can comprise projecting resilient flaps on part of the hold member sliding within the casing, the casing carrying flanges against which the flaps will abut when the hold member is disengaged and biased away from the plate.
- the invention does of course extend to a latch mechanism incorporating any two or more of the main aspects as hereinbefore defined.
- the latch mechanism illustrated in Figures 1 and 2 comprises a body 1 which houses parts for operating a bolt 2 which will be received within an opening 3 in a staple 4 which will be attached to a door frame.
- the mechanism within the body 1 also operates a deadlatch nose 5.
- the bolt 2 may be withdrawn by pulling a handle 6 in a sliding motion in thedirection away from the staple 4.
- the handle 6 may be held in the open condition (fully retracted) by pressing a hold button 7, the operation of which will be described later.
- the body 1 is attached to a back plate 8 which will be secured to the door and through which will pass a drive shaft 9 provided with a slot 10 to receive a tongue projecting from a cylinder lock which will be secured through the door and may be operated from the outside of the door by a suitable key.
- a moulded portion 11 projecting from the body 1 will house both the hold button 7 and a key operated mechanism at 12 for locking the handle 6 in either of its two alternative positions (i.e. as shown or fully retracted).
- the actual construction of the key operated mechanism at 12 is not an essential part of the apparatus and may take many forms. Its purpose is to enable a lock moulding 13 ( Figures 3 and 4) to be rotated between two alternative positions by use of a key only.
- the internal mechanism of the latch can be seen from Figures 3 to 6.
- the bolt nose 2 is fixed to a plate 14 by screws 15 which enter into a limb 16 of the plate 14 located within a slot within the bolt nose 2.
- the bolt nose can be removed, turned through 180 0 and secured in the new position so that the latch mechanism can be used with both inwardly and outwardly opening doors.
- the plate 4 has a generally oblong slot 17 (with an enlargement 17A for receipt of the lock moulding 13 during initial assembly) which will slide about a cylindrical portion of the lock moulding 13 as the bolt nose is moved from the extended position shown to a retracted position within the body 1.
- One method of moving the plate 14 is to rotate the drive shaft 9 (by key operation of the cylinder lock within the cylinder body 18 passing through the door 19). This causes an actuacting plate 20 (shown in dashed outline in Figure 3) to be carried around with the drive shaft 9 so as to act on a pin 21 projecting from the plate 14 and thus cause the plate 14 to slide about the lock moulding 13.
- An alternative method of moving the plate 14 is to pull the handle 6 outwardly of the body 1. As can be seen from Figure 4 the handle 6 has, secured thereto, a stepped plate 22 carrying hold plate 23 from which projects a limb 70. (see also Figures 3A and 3B) which is received in a notch 71 in the plate 14.
- deformable lugs 74 mate within openings in the plate 22, whilst a continuous slot is formed in the plate 22 in line with the limb 70 which projects therethrough into the notch 71.
- the hold plate is kept down by the flange 72 which extends out from the lock moulding 13.
- the lock moulding 13 In order for this operation to be carried out the lock moulding 13 must be in a condition wherein it does not prevent the sliding movement of the stepped plate 22 and hold plate 23.
- Figure 3 shows a pair of pins 59 on the body 1 received in slots 60 in the stepped plate 22 which guide the sliding movement of the plate 22.
- the lock moulding 13 has a slot 25 formed therein leaving a semi-circular portion 26 which can be moved into or out of one of a pair of notches 27, 28 in the hold plate 23.
- the stepped plate 22 carrying the hold plate 23 can slide freely backwards and forwards about the portion 26 of the lock moulding 13.
- the lock moulding 13 can be rotated through 90° into the condition illustrated in Figure 7 so as to locate in a notch 27 in the hold plate 23 whereby the stepped plate 22 is locked against sliding movement.
- the lock moulding 13 carries a pair of lugs 61 which can snap into notches 62 formed in part of the body portion 11. Two sets of notches 62 at right angles to one another will be provided so as to hold the lock moulding 13 releasably in either of the two conditions illustrated in Figures 7 and 8.
- the deformable lugs 74 on the hold plate 23 will bend if undue force is applied to the handle 6 when the plate 22 is locked onto the lock moulding 13 by the hold plate 23 so that the lock itself cannot be forced by pulling the handle 6.
- the lock moulding 13 may again be rotated through 90° so that the portion 26 locates within the notch 28 thus holding the handle 6 (and the bolt nose 2) in the retracted position. It will however be appreciated that whenever the lock moulding 13 is latched into the notch 27 the plate 14 is still free to move about the lock moulding when the latch mechanism is operated by a key inserted in the cylinder lock 18 to enable the bolt nose 2 to be withdrawn from the staple 4.
- a post 31 ( Figure 3) acts as a stop limiting the movement of the head of the spring 29 and thus of the bolt nose 2. The engagement of the spring arm 29 against the post 31 prevents the deadlatch nose from entering wholly within the body 1 and thus ensures that the bolt nose 2 will not become displaced inside the body 1.
- the handle 6 may be held in the retracted position temporarily by means of the hold button 7.
- the hold button ? comprises a moulded body of a resilient plastics material formed at its lower end with a notch 32.
- this notch 32 can locate about a reduced portion 33 of the stepped plate 22 as the tip 34 of the hold button 7 passes into an opening 35 due to pressure applied to the face of the button 7.
- the moulded hold button body incorporates a pair of resilient arms 36 which react against a part of the moulded portion 11 of the body 1 and thus bias the hold button ? outwardly of the portion 11.
- Integral flaps 37 which are biased slightly outwardly of the shaft 38 of the hold button 7 locate below steps (not shown) in a sleeve 39 through which the shaft 38 slides.
- the flaps 37 therefore limit the outward movement of the hold button 7 and will snap into place, during assembly, when the shaft 38 is initially inserted into the sleeve 39.
- a stop flange 37A limits the inward movement of the hold button 7 (especially during initial assembly).
- the latch mechanism also incorporates a deadlatch comprising the deadlatch nose 5 fixed to a deadlatch plate 40(as shown in Figures 3 and 5).
- the deadlatch nose 5 is biased into the extending position shown in Figure 3 by means of a tension spring 41 mounted between a pillar 42 secured to the plate 40 and a post 43 forming part of the body 1.
- a slot 44 in the plate 40 allows the plate and deadlatch nose 5 to move between alternative positions about a pin 45.
- This pin 45 forms part of a deadlatch moulding 46 which carries two further upstanding pins 4? and 48, positioned either side of the plate 40, and a resilient spring-like arm 49 which reacts against a boss 50 on the body 1.
- the arm 49 therefore biases the deadlatch moulding to rotate about a mounting post 51 on the body 1, in the clockwise direction as viewed in Figure 3.
- the bolt 2 may still be unlatched either by pulling the handle 6 or operating the cylinder lock 18 with a correct key from the outside of the door.
- Pulling of the handle 6 (assuming that the lock moulding 13 is in the condition shown in Figure 8) has the result that the chamfered edge 55 of the notched portion 54 acts as a cam surface on the pin 47 thus causing the deadlatch moulding 46 to rotate between the conditions illustrated in Figures 7 and 8.
- the Figure 8 condition of the deadlatch moulding 46 corresponds to that, for instance, of Figure 3 so that the bolt nose can readily be withdrawn.
- the bolt 2 can be held in the withdrawn position in one of two ways. Firstly, it can be held by the hold button 7 and can be readily released from this condition by pulling slightly on the handle 6 so that the hold button returns to the off position. In order to avoid the possibility of accidental lock-out, the bolt can be locked whilst in the withdrawn position by locating the portion 26 within the notch 28 by actuating the key operated mechanism 12 with the handle 6 held in the pulled out condition. A small indentation can be provided in the staple region which is contacted by the deadlatch nose 5, which will lightly hold the door closed when the bolt 2 is held in the withdrawn position.
- the latch mechanism has certain advantages in operation compared with a cylinder night-latch (or rim latch) mechanism where the bolt can only be withdrawn by rotating a knob.
- the handle 6 provided can readily be grasped by persons with semi- arthritic fingers, or could even be pushed with the flat of the hand or an elbow.
- the internal construction has been so designed that a minimal number of parts are employed, which parts can generally be formed by moulding or pressing. The method of assembly is relatively simple and thus lends itself to partial or full mechanisation.
- the cylinder lock within the cylinder body 18 may take many forms and may indeed be of identical form (for use with the same key) as that which will be employed for the key operated mechanism 12.
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Abstract
Description
- This invention is concerned with latch mechanisms such as those which are used on doors.
- The conventional door latch mechanism takes many forms and, where security is important the construction can be quite intricate. Thus, the conventional cylinder night-latch or lock mechanism incorporates a large number of parts requiring intricate assembly which cannot readily be mechanised.
- It is an object of this invention to provide a latch mechanism which will provide good security and will have the conventional features of this type of door latch whilst providing advantages as to the method of operation and the degree of intricacy of construction.
- According to one aspect of this invention there is provided a latch mechanism comprising a casing within which is mounted a bolt which can slide from an extended position whereby it projects through the casing and a retracted position wherein it is at least partially withdrawn into the casing, a drive shaft for rotary operation by a cylinder lock mechanism and carrying a drive member which may be rotated by the drive shaft to drive the bolt linearly from one position to the other, and an operating handle projecting from the other side of the casing and linked with the bolt so as to move the bolt from one position to the other as the handle is slideably moved with respect to the casing.
- It is greatly preferred that the drive member and operating handle act independently upon the bolt, so that the cylinder lock does not have to drive the handle. Thus, the drive member and the operating handle may independently engage a plate carrying the bolt. For instance, the drive member may be disposed to engage a pin projecting from the plate, whilst the operating handle is disposed to engage a flange projecting from the plate.
- The plate itself may incorporate a groove which will slide about the drive shaft as the bolt moves between its two positions. Also the bolt is ideally biased, such as by a spring, to the extended position.
- From a further aspect the invention provides a latch mechanism comprising a casing within which is mounted a bolt which can slide from an extended position whereby it projects through the casing and a retracted position wherein it is at least partially withdrawn into the casing, an operating handle projecting from the other side of the casing and linked with the bolt through a plate so as to move the bolt from one position to the other as the handle is slideably moved with respect to the casing, the plate having a slot receiving a rotatable catch formed, in the region of the slot, with a groove cut in the side of the catch, or a projection from the side of the catch, the slot providing a track extending in the direction of movement of the plate and notches extending at generally at right angles to the track such that, when the catch is in one attitude the track may slide about the formation of the catch, whilst the catch may be rotated to locate within one of the notches to prevent sliding of the plate.
- In this latch mechanism two notches will normally be sufficient for holding the bolt in either of its two positions. The rotatable catch can be of circular cross-section and be formed with a semi-circular groove therein, the notches having correspondingly shaped curved and flat faces.
- It is preferred that the catch should incorporate lugs which are a releasable snap fit into grooves in the body of the latch mechanism. These grooves will ideally be disposed to hold the catch either in said one attitude or in the condition where it is fully engaged with one of the notches.
- A still further aspect of the invention resides in a deadlatch mechanism comprising a casing within which are mounted a bolt and a deadlatch, both of which can slide from an extended position whereby they project through the casing and retracted positions wherein each is at least partially withdrawn into the casing, the bolt and deadlatch being carried by a respective bolt plate and deadlatch plate, the bolt plate being movable by an operating member between its two positions, the deadlatch mechanism also incorporating a bolt securing member which is held by the deadlatch plate out of contact with the bolt plate when the deadlatch is in the extended position but which is driven into locking engagement with a part of the bolt plate so as to prevent movement of the bolt to the retracted position when the bolt is extended and the deadlatch is in the retracted position, the operating member being operable to disengage the bolt securing member from the notch in the bolt plate.
- Whilst the bolt securing member could be a sliding member, it is preferred that it should take the form of a rotary member carrying first and second pins which can respectively engage with a notch in the bolt plate when the bolt is in the extended position and a notch in the deadlatch plate when the deadlatch is in the retracted position. With such an arrangement the operating member can be positioned to be able to engage one of the pins to drive the first pin out of engagement with the notch of the bolt plate.
- Ideally the bolt securing member is biased into the position of locking engagement with the part of the bolt plate, such biasing means comprising a spring arm carried by the bolt securing member. Also the deadlatch itself is preferably biased into the extended position such as by a spring.
- Also forming a feature of this invention is a latch hold mechanism comprising a casing within which is mounted a bolt which can slide from an extended position whereby it projects through the casing and a retracted position wherein it is at least partially withdrawn into the casing, the bolt being carried by a plate incorporating a slot whose edge may be engaged by a notch at the end of a hold member, the hold member being biased to raise the notched end thereof free of the slot in the plate when the edge of the slot in the plate is disengaged from the notch, the hold member also incorporating an actuating portion which can be pressed against the bias to allow the notch to engage with the edge of the slot in the plate.
- In the preferred embodiment of latch hold mechanism the hold member is biased by integral spring-like arms thereof acting on part of the casing, and the actuating portion is a button extending through the casing. Retaining means may be included for preventing the hold member from being removed from the casing. This retaining means can comprise projecting resilient flaps on part of the hold member sliding within the casing, the casing carrying flanges against which the flaps will abut when the hold member is disengaged and biased away from the plate.
- The invention does of course extend to a latch mechanism incorporating any two or more of the main aspects as hereinbefore defined.
- The invention may be performed in various ways and a preferred form of latch mechanism according to the invention will now be described with reference to the accompanying drawings, in which:-
- Figure 1 is a perspective view from above of the latch mechanism and staple;
- Figure 2 is a perspective view from below of the latch mechanism and staple;
- Figure 3 is a cross section on line III-III of Figure 1, and Figures 3A and 3B show parts thereof;
- Figure 4 is a cross section on line IV-IV of Figure 3;
- Figure 5 is a cross section on line V-V of Figure 3;
- Figure 6 is a cross section on line VI-VI of Figure 3;
- Figures 7 and 8 illustrate alternative states of a lock mechanism of the apparatus shown in Figures 3 to 6;
- Figures 9 to 11 illustrate various conditions of the door bolt and deadlatch of the apparatus shown in Figures 3 to 6; and
- Figures 12 to 14 illustrate various conditions of a lock actuator forming part of the apparatus of Figures 3 to 6.
- The latch mechanism illustrated in Figures 1 and 2 comprises a body 1 which houses parts for operating a
bolt 2 which will be received within an opening 3 in a staple 4 which will be attached to a door frame. The mechanism within the body 1 also operates adeadlatch nose 5. As will be explained hereinafter thebolt 2 may be withdrawn by pulling ahandle 6 in a sliding motion in thedirection away from the staple 4. Thehandle 6 may be held in the open condition (fully retracted) by pressing a hold button 7, the operation of which will be described later. The body 1 is attached to aback plate 8 which will be secured to the door and through which will pass a drive shaft 9 provided with aslot 10 to receive a tongue projecting from a cylinder lock which will be secured through the door and may be operated from the outside of the door by a suitable key. Amoulded portion 11 projecting from the body 1 will house both the hold button 7 and a key operated mechanism at 12 for locking thehandle 6 in either of its two alternative positions (i.e. as shown or fully retracted). The actual construction of the key operated mechanism at 12 is not an essential part of the apparatus and may take many forms. Its purpose is to enable a lock moulding 13 (Figures 3 and 4) to be rotated between two alternative positions by use of a key only. - The internal mechanism of the latch can be seen from Figures 3 to 6. The
bolt nose 2 is fixed to aplate 14 byscrews 15 which enter into alimb 16 of theplate 14 located within a slot within thebolt nose 2. The bolt nose can be removed, turned through 1800 and secured in the new position so that the latch mechanism can be used with both inwardly and outwardly opening doors. The plate 4 has a generally oblong slot 17 (with anenlargement 17A for receipt of the lock moulding 13 during initial assembly) which will slide about a cylindrical portion of the lock moulding 13 as the bolt nose is moved from the extended position shown to a retracted position within the body 1. - One method of moving the
plate 14 is to rotate the drive shaft 9 (by key operation of the cylinder lock within thecylinder body 18 passing through the door 19). This causes an actuacting plate 20 (shown in dashed outline in Figure 3) to be carried around with the drive shaft 9 so as to act on apin 21 projecting from theplate 14 and thus cause theplate 14 to slide about the lock moulding 13. An alternative method of moving theplate 14 is to pull thehandle 6 outwardly of the body 1. As can be seen from Figure 4 thehandle 6 has, secured thereto, astepped plate 22 carryinghold plate 23 from which projects alimb 70. (see also Figures 3A and 3B) which is received in a notch 71 in theplate 14. Alsodeformable lugs 74 mate within openings in theplate 22, whilst a continuous slot is formed in theplate 22 in line with thelimb 70 which projects therethrough into the notch 71. The hold plate is kept down by theflange 72 which extends out from the lock moulding 13. Thus when thehandle 6 is pulled outwardly thestepped plate 22 carries with it holdplate 23 and theplate 14 so as to withdraw thebolt nose 2 from the staple 4 secured to thedoor frame 24. In order for this operation to be carried out the lock moulding 13 must be in a condition wherein it does not prevent the sliding movement of thestepped plate 22 and holdplate 23. Figure 3 shows a pair ofpins 59 on the body 1 received inslots 60 in thestepped plate 22 which guide the sliding movement of theplate 22. - As can be seen from Figure 4 (and more clearly from Figures 7 and 8) the lock moulding 13 has a
slot 25 formed therein leaving asemi-circular portion 26 which can be moved into or out of one of a pair ofnotches hold plate 23. When the lock moulding is in the position illustrated in Figure 8 thestepped plate 22 carrying thehold plate 23 can slide freely backwards and forwards about theportion 26 of the lock moulding 13. When thehandle 6 is in the normal condition (into which it is biased by aspring arm 29 acting between apost 30 and the bolt nose 2) the lock moulding 13 can be rotated through 90° into the condition illustrated in Figure 7 so as to locate in anotch 27 in thehold plate 23 whereby thestepped plate 22 is locked against sliding movement. The lock moulding 13 carries a pair oflugs 61 which can snap intonotches 62 formed in part of thebody portion 11. Two sets ofnotches 62 at right angles to one another will be provided so as to hold the lock moulding 13 releasably in either of the two conditions illustrated in Figures 7 and 8. Thedeformable lugs 74 on thehold plate 23 will bend if undue force is applied to thehandle 6 when theplate 22 is locked onto the lock moulding 13 by thehold plate 23 so that the lock itself cannot be forced by pulling thehandle 6. - When the
handle 6 is pulled out into the retracted position against the bias of thespring 29 the lock moulding 13 may again be rotated through 90° so that theportion 26 locates within thenotch 28 thus holding the handle 6 (and the bolt nose 2) in the retracted position. It will however be appreciated that whenever the lock moulding 13 is latched into thenotch 27 theplate 14 is still free to move about the lock moulding when the latch mechanism is operated by a key inserted in thecylinder lock 18 to enable thebolt nose 2 to be withdrawn from the staple 4. A post 31 (Figure 3) acts as a stop limiting the movement of the head of thespring 29 and thus of thebolt nose 2. The engagement of thespring arm 29 against the post 31 prevents the deadlatch nose from entering wholly within the body 1 and thus ensures that thebolt nose 2 will not become displaced inside the body 1. - The
handle 6 may be held in the retracted position temporarily by means of the hold button 7. As can be seen from Figure 6 the hold button ? comprises a moulded body of a resilient plastics material formed at its lower end with anotch 32. When thehandle 6 has been withdrawn thisnotch 32 can locate about a reducedportion 33 of the steppedplate 22 as thetip 34 of the hold button 7 passes into anopening 35 due to pressure applied to the face of the button 7. The moulded hold button body incorporates a pair ofresilient arms 36 which react against a part of the mouldedportion 11 of the body 1 and thus bias the hold button ? outwardly of theportion 11. Integral flaps 37 which are biased slightly outwardly of theshaft 38 of the hold button 7 locate below steps (not shown) in asleeve 39 through which theshaft 38 slides. Theflaps 37 therefore limit the outward movement of the hold button 7 and will snap into place, during assembly, when theshaft 38 is initially inserted into thesleeve 39. Astop flange 37A limits the inward movement of the hold button 7 (especially during initial assembly). When thehandle 6 is held in the retracted position by means of the hold button 7 it can be released by effecting a slight outward movement on thehandle 6 whereupon thenotch 32 becomes disengaged from thepart 33 so that the hold button is moved clear of thepart 33 by the action of the spring-like arms 36. Release of thehandle 6 then results in the mechanism returning to the normal condition with thebolt nose 2 extended. - The latch mechanism also incorporates a deadlatch comprising the
deadlatch nose 5 fixed to a deadlatch plate 40(as shown in Figures 3 and 5). Thedeadlatch nose 5 is biased into the extending position shown in Figure 3 by means of atension spring 41 mounted between apillar 42 secured to theplate 40 and apost 43 forming part of the body 1. Aslot 44 in theplate 40 allows the plate anddeadlatch nose 5 to move between alternative positions about apin 45. Thispin 45 forms part of adeadlatch moulding 46 which carries two further upstanding pins 4? and 48, positioned either side of theplate 40, and a resilient spring-like arm 49 which reacts against aboss 50 on the body 1. Thearm 49 therefore biases the deadlatch moulding to rotate about a mountingpost 51 on the body 1, in the clockwise direction as viewed in Figure 3. - Operation of the deadlatch mechanism can be understood most clearly from Figures 9 to 14. (Wherein some features of the shape of the
plate 14 have been omitted). When, as shown in Figure 9, the door is open so that thebolt nose 2 anddeadlatch nose 5 are fully extended, thedeadlatch moulding 46 is held in the same condition as illustrated in Figure 3 because thepin 48 is held against the side of theplate 40. As the door closes both thebolt nose 2 and thedeadlatch nose 5 are pushed inwardly by the leading edge of the staple 4 (Figure 10) and, although thepin 48 is now free to move into anotch 52 in theplate 40, it is prevented from doing so because thepin 47 is now held against the side of theplate 14 carrying thebolt nose 2. When the door is pushed fully home thebolt nose 2 enters the opening 3 in the staple 4 so that theplate 14 moves to the condition illustrated in Figure 11.. Thedeadlatch uose 5 will still however be held in the retracted position by the body of the staple 4 so that thedeadlatch moulding 46 can now rotate whereupon thepins notch 52 and anotch 53 in the side of the plate 14 (theplate 22 has the correspondingnotch 54 to the notch '53 in theplate 14 which also accommodates thepin 47 in this condition). - Any attempt to force the latch by inserting a knife or similar thin member between the body 1 and the staple 4 to try and push the
bolt nose 2 inwardly will meet with failure since thebolt nose 2 will be locked in the extended position by the reaction of thepin 47 on the notchedportion 53 of theplate 14. Also thedeadlatch nose 5 cannot be forced inwardly any further in an attempt to cause thedeadlatch moulding 46 to rotate back to the condition illustrated in Figures 9 and 10 since thepins slot 44 and thenotch 52. - When the door is in the closed position as illustrated in Figure 11 the
bolt 2 may still be unlatched either by pulling thehandle 6 or operating thecylinder lock 18 with a correct key from the outside of the door. Pulling of the handle 6 (assuming that thelock moulding 13 is in the condition shown in Figure 8) has the result that the chamferededge 55 of the notchedportion 54 acts as a cam surface on thepin 47 thus causing thedeadlatch moulding 46 to rotate between the conditions illustrated in Figures 7 and 8. The Figure 8 condition of thedeadlatch moulding 46 corresponds to that, for instance, of Figure 3 so that the bolt nose can readily be withdrawn. - If a correct key is inserted into the
cylinder lock 18 and rotated this will cause theactuating plate 20 to move firstly from the condition shown in Figure 12 to the condition shown in Figure 13. In the process aface 56 of theactuating plate 20 acts as a cam face on thepin 47 to move the deadlatch moulding into the unlatched position. As theactuating plate 20 rotates further, anarm 57 of theactuating plate 20 reacts against thepin 21, thus carrying theplate 14 to the retracted position, and acurved surface 58 of the actuating plate continues to maintain thedeadlatch moulding 46 in the unlatched condition (Figure 14). - The latch mechanism described in connection with the drawings can be seen to incorporate many operative features and advantages with respect to conventional latch mechanisms. The important features of the method of operation of the mechanism will now be discussed briefly. As can be seen from the drawings, when the door is closed the bolt is automatically deadlocked thus providing substantial resistance against tampering. Furthermore, it is possible to prevent the door from being opened from the inside unless a key is used to turn the lock moulding 13 from the locking position wherein the
portion 26 is latched into thenotch 27. The lock moulding will be operated from the inside by means of the key operatedmechanism 12. Furthermore, when theportion 26 is latched into thenotch 27 with the door open, the door can still be closed so that thehandle 6 is locked against movement. This feature is important for glass panelled doors and the like where an intruder might be tempted to break the panel with a view to unlatching the lock from the inside. - The
bolt 2 can be held in the withdrawn position in one of two ways. Firstly, it can be held by the hold button 7 and can be readily released from this condition by pulling slightly on thehandle 6 so that the hold button returns to the off position. In order to avoid the possibility of accidental lock-out, the bolt can be locked whilst in the withdrawn position by locating theportion 26 within thenotch 28 by actuating the key operatedmechanism 12 with thehandle 6 held in the pulled out condition. A small indentation can be provided in the staple region which is contacted by thedeadlatch nose 5, which will lightly hold the door closed when thebolt 2 is held in the withdrawn position. - As well as being of pleasing appearance the latch mechanism has certain advantages in operation compared with a cylinder night-latch (or rim latch) mechanism where the bolt can only be withdrawn by rotating a knob. The
handle 6 provided can readily be grasped by persons with semi- arthritic fingers, or could even be pushed with the flat of the hand or an elbow. Furthermore, the internal construction has been so designed that a minimal number of parts are employed, which parts can generally be formed by moulding or pressing. The method of assembly is relatively simple and thus lends itself to partial or full mechanisation. The cylinder lock within thecylinder body 18 may take many forms and may indeed be of identical form (for use with the same key) as that which will be employed for the key operatedmechanism 12.
Claims (24)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81302812T ATE12132T1 (en) | 1980-06-24 | 1981-06-23 | TRAP MECHANISMS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8020677 | 1980-06-24 | ||
GB8020677A GB2080382A (en) | 1980-06-24 | 1980-06-24 | Improvements relating to latch mechanisms |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0042757A1 true EP0042757A1 (en) | 1981-12-30 |
EP0042757B1 EP0042757B1 (en) | 1985-03-13 |
Family
ID=10514285
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81302812A Expired EP0042757B1 (en) | 1980-06-24 | 1981-06-23 | Improvements relating to latch mechanisms |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0042757B1 (en) |
AT (1) | ATE12132T1 (en) |
DE (1) | DE3169242D1 (en) |
GB (1) | GB2080382A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2303874A (en) * | 1995-07-31 | 1997-03-05 | Talleres Escoriaza Sa | Automatic deadlocking mechanism in latch bolt lock |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1513904A (en) * | 1922-10-07 | 1924-11-04 | Elert A Hill | Lock mechanism |
US3765710A (en) * | 1971-05-10 | 1973-10-16 | Keystone Consolidated Ind Inc | Dual action night latch and lock |
-
1980
- 1980-06-24 GB GB8020677A patent/GB2080382A/en not_active Withdrawn
-
1981
- 1981-06-23 DE DE8181302812T patent/DE3169242D1/en not_active Expired
- 1981-06-23 AT AT81302812T patent/ATE12132T1/en not_active IP Right Cessation
- 1981-06-23 EP EP81302812A patent/EP0042757B1/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1513904A (en) * | 1922-10-07 | 1924-11-04 | Elert A Hill | Lock mechanism |
US3765710A (en) * | 1971-05-10 | 1973-10-16 | Keystone Consolidated Ind Inc | Dual action night latch and lock |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2303874A (en) * | 1995-07-31 | 1997-03-05 | Talleres Escoriaza Sa | Automatic deadlocking mechanism in latch bolt lock |
GB2303874B (en) * | 1995-07-31 | 1998-09-30 | Talleres Escoriaza Sa | Door lock |
Also Published As
Publication number | Publication date |
---|---|
ATE12132T1 (en) | 1985-03-15 |
DE3169242D1 (en) | 1985-04-18 |
EP0042757B1 (en) | 1985-03-13 |
GB2080382A (en) | 1982-02-03 |
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