GB2188364A - Locks - Google Patents

Abstract

A lock comprises a bolt member (52) carried by a slidable lath (53) which is drivingly engaged by a pivoted link (57) which carries a gated lever (60) and an actuator plate (70), both of which are arranged to be engaged by a cam (32) afforded by a cylinder lock (30) which operates via the actuator plate (70) to pivot the link and thereby drive the bolt member. <IMAGE>

Description

SPECIFICATION Locks This invention relates to locks, primarily of the kind used for securing doors, and which may incorporate a hand operated latch mechanism in addition to a key-operated bolt mechanism.

The object of the present invention is to provide an improved lock having one or more novel features or a novel combination offeaturesas hereinafter described.

The present invention resides in a lock having one or more ofthefollowing features orany other novel feature as hereinafter described alone or in any combination:a bolt member movable between projected and retracted positions by means of a key-operable locking mechanism which includes a pivoted link drivingly engaged with a lath on which the bolt memberwhen provided is carried, the pivoted link also carrying, at a position between that at which it is engaged with the lath and its pivot point, a gated lever which is arranged to co-operate with a fixed abutment or talent which extends through the gate and normally prevents movement of the lever lengthwise unless displaced by the key-operated locking mechanism to an alternative position in which such movement is permitted; the gated lever and an actuator plate carried bythe link are engaged by a cam afforded by a cylindrical lock which operates to pivot the link.

The invention will now be described by way of example with reference to the accompanying drawings, wherein:- Figure lisa view showing the complete bolt operating mechanism in a condition just preparatory to thethrowing ofthe bolt bythe mechanism towards its projected position; and Figure2illustrates certain components of the bolt mechanism.

Referring specifically to Figure 1, the bolt actuating mechanism 50 includes a slidable bolt member 51 comprising a bolt 52 carried attheforward end of a bolt lath 53. The lath is guided on a fixed peg, or talent, 54 received in a slot 55. The lath is driven longitudinally by means of a pin 56 on a pivoted link 57 in engaging inaverticalslot58formedinthelath.

The link 57 is mounted on a fixed peg 59 and carries a pin 56a on which is mounted a pivoted lever 60. The lever 60 includes a central aperture, or gate, 61 which is shaped to afford a forward part 61a and a rearward part 61b separated by an inwardly projecting tongue 62.

The gate 61 is of conventional shape, whereby the lever60 may not only pivot on the pin 56a, butalso move lengthwise over the talent 54, which nevertheless engages the tongue 62 in such a manner as to prevent forward movement of the lever (and hence the bolt 52) until the lever is lifted bythe lock mechanism 30. For this purpose, the lever 60 affords a cam face 63 which is engaged bythe cylinder cam 32 as the cylinder 31 of the lock mechanism is rotated so that, over part of the range of movement of the cam, the lever 60 is raised to clearthetongue 62from thetalent 54.

The lengthwise movement of the lever 60 is also derived from rotary movement of the cylinder cam 32, and forthis purpose the pin 56a also carries an actuator plate 70 pivotally mounted thereon. The plate 70 is formed with a slot 71 in which thy talent is located in order to limit movementofthe plate in the bolt th rowing and retracting directions. At its underside, the plate 70 is formed with a recess 72 of generally rectangular shape and of a length sufficientto acceptthe cylinder cam 32.The arrangement is such that when the cylinder cam is moved in the bolt throwing direction (arrowA, Figure 1) one radial face engages one end face 73 of the recess, whilst when the cylinder cam is rotated in the bolt retracting direction the other radial face of the cylinder cam engages the other end face 74 of the recess so that the plate 70 is driven in the corresponding direction between the limits imposed by the points at which the cylinder cam 32 becomes disengaged from the recess by virtue of its curved path of movement. Whilst the cylinder cam is engaged within the recess 72, its outer face engages the cam face 63 of the lever 60 thereby lifting it into a position in which it is free to move lengthwise.

Thus, as the cylinder lock is operated to move the cylinder cam 32 along its arcuate path, the lever is first raised to a position such that it is able to move lengthwise, and then the plate 70 is moved by the cylinder cam 32, taking the leverwith it since they are both carried on the pin 56a. This causes the link 57 to pivot about the fixed peg 59. This in turn moves the pin 56thorough an arc of greater radius than that on which the pin 56a moves, and by virtue of engagement of the pin 56 in the slot 58, the lath 53 is moved through a linear distance substantially greaterthan the linear movement of plate 70. In this way, the throw of the bolt 52 carried by the lath 53 is substantially greater than the linear movement allowed to the plate 70 byvirtue of direct engagement with the cylinder cam 32.

To bias the lever 60 positively into its lowest position, it carriers a spring 64 which reacts against stop 75 formed or provided on the plate 70, which is constrained against vertical movement by engagementofthetalent 54 inthe slot71.

1. Alockcomprising a boltmemberwhich is movable between projected and retracted positions by means of a key-operable locking mechanism which includes a pivoted link drivingly engaged with a lath on which the bolt member is carried, the pivoted link also carrying, at a position between that at which it is engaged with the lath and its pivot point, a gated lever which is arranged to co-operate with a fixed abutment which extends through the gate and normally prevents movement of the lever lengthwise unless displaced by the key-operated locking mechanism to an alternative position in which such movement is permitted.

2. A lock according to Claim 1 whereinthegated leverandanactuatorplatecarried bythelinkare engaged by a cam afforded by a cylinder lockwhich

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Locks This invention relates to locks, primarily of the kind used for securing doors, and which may incorporate a hand operated latch mechanism in addition to a key-operated bolt mechanism. The object of the present invention is to provide an improved lock having one or more novel features or a novel combination offeaturesas hereinafter described. The present invention resides in a lock having one or more ofthefollowing features orany other novel feature as hereinafter described alone or in any combination:a bolt member movable between projected and retracted positions by means of a key-operable locking mechanism which includes a pivoted link drivingly engaged with a lath on which the bolt memberwhen provided is carried, the pivoted link also carrying, at a position between that at which it is engaged with the lath and its pivot point, a gated lever which is arranged to co-operate with a fixed abutment or talent which extends through the gate and normally prevents movement of the lever lengthwise unless displaced by the key-operated locking mechanism to an alternative position in which such movement is permitted; the gated lever and an actuator plate carried bythe link are engaged by a cam afforded by a cylindrical lock which operates to pivot the link. The invention will now be described by way of example with reference to the accompanying drawings, wherein:- Figure lisa view showing the complete bolt operating mechanism in a condition just preparatory to thethrowing ofthe bolt bythe mechanism towards its projected position; and Figure2illustrates certain components of the bolt mechanism. Referring specifically to Figure 1, the bolt actuating mechanism 50 includes a slidable bolt member 51 comprising a bolt 52 carried attheforward end of a bolt lath 53. The lath is guided on a fixed peg, or talent, 54 received in a slot 55. The lath is driven longitudinally by means of a pin 56 on a pivoted link 57 in engaging inaverticalslot58formedinthelath. The link 57 is mounted on a fixed peg 59 and carries a pin 56a on which is mounted a pivoted lever 60. The lever 60 includes a central aperture, or gate, 61 which is shaped to afford a forward part 61a and a rearward part 61b separated by an inwardly projecting tongue 62. The gate 61 is of conventional shape, whereby the lever60 may not only pivot on the pin 56a, butalso move lengthwise over the talent 54, which nevertheless engages the tongue 62 in such a manner as to prevent forward movement of the lever (and hence the bolt 52) until the lever is lifted bythe lock mechanism 30. For this purpose, the lever 60 affords a cam face 63 which is engaged bythe cylinder cam 32 as the cylinder 31 of the lock mechanism is rotated so that, over part of the range of movement of the cam, the lever 60 is raised to clearthetongue 62from thetalent 54. The lengthwise movement of the lever 60 is also derived from rotary movement of the cylinder cam 32, and forthis purpose the pin 56a also carries an actuator plate 70 pivotally mounted thereon. The plate 70 is formed with a slot 71 in which thy talent is located in order to limit movementofthe plate in the bolt th rowing and retracting directions. At its underside, the plate 70 is formed with a recess 72 of generally rectangular shape and of a length sufficientto acceptthe cylinder cam 32.The arrangement is such that when the cylinder cam is moved in the bolt throwing direction (arrowA, Figure 1) one radial face engages one end face 73 of the recess, whilst when the cylinder cam is rotated in the bolt retracting direction the other radial face of the cylinder cam engages the other end face 74 of the recess so that the plate 70 is driven in the corresponding direction between the limits imposed by the points at which the cylinder cam 32 becomes disengaged from the recess by virtue of its curved path of movement. Whilst the cylinder cam is engaged within the recess 72, its outer face engages the cam face 63 of the lever 60 thereby lifting it into a position in which it is free to move lengthwise. Thus, as the cylinder lock is operated to move the cylinder cam 32 along its arcuate path, the lever is first raised to a position such that it is able to move lengthwise, and then the plate 70 is moved by the cylinder cam 32, taking the leverwith it since they are both carried on the pin 56a. This causes the link 57 to pivot about the fixed peg 59. This in turn moves the pin 56thorough an arc of greater radius than that on which the pin 56a moves, and by virtue of engagement of the pin 56 in the slot 58, the lath 53 is moved through a linear distance substantially greaterthan the linear movement of plate 70. In this way, the throw of the bolt 52 carried by the lath 53 is substantially greater than the linear movement allowed to the plate 70 byvirtue of direct engagement with the cylinder cam 32. To bias the lever 60 positively into its lowest position, it carriers a spring 64 which reacts against stop 75 formed or provided on the plate 70, which is constrained against vertical movement by engagementofthetalent 54 inthe slot71. CLAIMS

1. Alockcomprising a boltmemberwhich is movable between projected and retracted positions by means of a key-operable locking mechanism which includes a pivoted link drivingly engaged with a lath on which the bolt member is carried, the pivoted link also carrying, at a position between that at which it is engaged with the lath and its pivot point, a gated lever which is arranged to co-operate with a fixed abutment which extends through the gate and normally prevents movement of the lever lengthwise unless displaced by the key-operated locking mechanism to an alternative position in which such movement is permitted.

2. A lock according to Claim 1 whereinthegated leverandanactuatorplatecarried bythelinkare engaged by a cam afforded by a cylinder lockwhich operates to pivot the link.

3. A lock according to Claim 2 wherein the lever carries a spring which reacts against a stop formed or provided on the actuator plate.

4. A lock according to anyone of the preceding claims wherein the pivoted link is drivingly engaged with the lath by means of a pin on said linkengaging in a slot formed in the lath.

5. A lock comprising a bolt member carried by a slidable lath which is drivingly engaged by a pivoted link which carries a gated lever and an actuator plate, both of which are arranged to be engaged by a cam afforded bya cylinderlockwhich operates to pivot the link and thereby drive the bolt member.

6. A lock incorporating a bolt mechanism substantially as herein before described with reference to and as shown in the accompanying drawings.