Anti-theft safety lock device with means preventing its unallowed removal from the lock-holder

Claim 2

An anti-theft device including an operator''s key-responsive safety lock comprising: a stationary hollow casing; a body portion forming a stator provided with a longitudinal bore and removably mounted in said casing; a tumbler cylinder forming a rotary plug rotatably fitted within said longitudinal bore of said stator and formed with a key-hole for receiving a removable plug-actuating key for rotating said plug in either direction to and from a plurality of angular positions; said casing being provided with a hole opening at least at the inner wall surface of said casing; said rotary plug being provided on its radially outer side wall surface with a recess adapted to be aligned in registering relationship with said hole Through rotary displacement of said plug; said stator being formed with a transversely extending bore opening with its opposite ends towards said rotary plug and towards said hole of said casing, respectively; and a spring-loaded locking finger slidably mounted in said bore of said stator and engageable endwise with either of said hole in said casing and of said recess in said rotary plug, said locking finger having such a length that upon its engagement with said hole in said casing, said finger securely locks said stator within said casing and is disengaged from said recess in said rotary plug and that upon the engagement of said finger with said recess in said rotary plug, said finger disengages said hole in said casing thereby releasing said stator from said casing, said locking finger being biased by its spring so as to be urged towards its casing hole engaging position; wherein the improvement consists in the provision of means adapted to prevent said locking finger to be subjected to a coaxial radially inwards directed thrust force capable to cause said locking finger to be driven into the side wall of said rotary plug when the angular position of the latter is such that said recess in said plug is out of alignment with said locking finger, said hole in said casing extending throughout the thickness of the wall of said casing so as to open to the outside thereof, said means preventing the application of such a thrust force including holeguard means rigidly secured to the outside wall of said casing and covering said hole in said casing in spaced relationship therewith, said hole-guard means being formed with at least one sidewise located opening the centre line axis of which is substantially at right angles to the longitudinal axis of said hole whereas the plane of said opening is parallel with said longitudinal axis of said hole and laterally offset with respect thereto.

Claim 3

An anti-theft device including an operator''s key-responsive safety lock comprising: a stationary hollow casing; a body portion forming a stator provided with a longitudinal bore and removably mounted in said casing; a tumbler cylinder forming a rotary plug rotatably fitted within said longitudinal bore of said stator and formed with a key-hole for receiving a removable plug-actuating key for rotating said plug in either direction to and from a plurality of angular positions; said casing being provided with a hole opening at least at the inner wall surface of said casing; said rotary plug being provided on its radially outer side wall surface with a recess adapted to be aligned in registering relationship with said hole through rotary displacement of said plug; said stator being formed with a transversely extending bore opening with its opposite ends towards said rotary plug and towards said hole of said casing, respectively; and a spring-loaded locking finger slidably mounted in said bore of said stator and engageable endwise with either of said hole in said casing and of said recess in said rotary plug, said locking finger having such a length that upon its engagement with said hole in said casing, said finger securely locks said stator within said casing and is disengaged from said recess in said rotary plug and that upon the engagement of said finger with said recess in said rotary plug, said finger disengages said hole in said casing thereby releasing said stator from said casing, said locking finger being biased by its spring so as to be urged towards its casing hole engaging position; wherein the improvement consists in the provision of means adapted to prevent said locking finger to be subjected to a coaxial radially inwards directed thrust force capable to cause said locking finger to be driven into the side wall of said rotary plug when the angular position of the latter is such that said recess in said plug is out of alignment with said locking finger, and wherein said hole in said casing is a blind hole and said stator comprises a longitudinally extending open cavity formed in the outside lateral wall of said stator and extending substantially at right angles to said transverse bore for said locking finger; and a resiliently deformable strip secured with one end into the outer side wall of said stator so as to be tangentially embedded therein, said strip having a substantially straight portion parallel to the inside wall of said casing and projecting over said recess and terminating at its opposite end by a sidewise outwards offset tip portion engageable with said hole in said casing and adapted to bear against the adjacent end of said locking finger, said strip resting in its unstrained and non-deformed position against the inner side wall of said casing with its tip portion engaging said blind hole in said casing, said blind hole being deep enough to also accommodate the adjacent end of said locking finger; said casing being formed with an orifice extending through the side wall of said casing and located in front of said straight portion of said strip; the free length of said strip being long enough to allow an intermediate portion of said strip to be forced inwards into contact with said stator while still keeping bearing against the terminal face of the adjacent end of said locking finger; said strip being stiff enough to allow when pushed inwards through said orifice to drive said locking finger into said plug recess when the latter registers with said finger.

Claim 4

An anti-theft device including an operator''s key-responsive safety lock comprising: a stationary hollow casing; a body portion forming a stator provided with a longitudinal bore and removably mounted in said casing; a tumbler cylinder forming a rotary plug rotatably fitted within said longitudinal bore of said stator and formed with a key-hole for receiving a removable plug-actuating key for rotating said plug in either direction to and from a plurality of angular positions; said casing being provided with a hole opening at least at the inner wall surface of said casing; said rotary plug being provided on its radially outer side wall surface with a recess adapted to be aligned in registering relationship with said hole through rotary displacement of said plug; said stator being formed with a transversely extending bore opening with its opposite ends towards said rotary plug and towards said hole of said casing, respectively; and a spring-loaded locking finger slidably mounted in said bore of said stator and engageable endwise with either of said hole in said casing and of said recess in said rotary plug, said locking finger having such a length that upon its engagement with said hole in said casing, said finger securely locks said stator within said casing and is disengaged from said recess in said rotary plug and that upon the engagement of said finger with said recess in said rotary plug, said finger disengages said hole in said casing thereby releasing said stator from said casing, said locking finger being biased by its spring so as to be urged towards its casing hole engaging position; wherein the improvement consists in the provision of means adapted to prevent said locking finger to be subjected to a coaxial radially inwards directed thrust force capable to cause said locking finger to be driven into the side wall of said rotary plug when the angular position of the latter is such that said recess in said plug is out of alignment with said locking finger, and wherein said hole in said casing is a blind hole and said stator comprises a longitudinally extending open cavity formed in the outside lateral wall of said stator and extending substantially at right angles to said transverse bore for said locking finger; and a resiliently deformable strip secured with one end into the outer side wall of said stator so as to be tangentially embedded therein, said strip having a substantially straight portion parallel to the inside wall of said casing and projecting over said recess and terminating at its opposite end by a sidewise outwards offset tip portion engageable with said hole in said casing and adapted to bear against the adjacent end of said locking finger, said strip resting in its unstrained and non-deformed position against the inner side wall of said casing with its tip portion engaging said blind hole in said casing, said blind hole being deep enough to also accommodate the adjacent end of said locking finger; said casing being formed with an orifice extending through the side wall of said casing and located in front of said straight portion of said strip; the free length of said strip being long enough to allow an intermediate portion of said strip to be forced inwards into contact with said stator while still keeping bearing against the terminal face of the adjacent end of said locking finger; said strip being stiff enough to allow when pushed inwards through said orifice to drive said locking finger into said plug recess when the latter registers with said finger.

Claim 5

A device according to claim 2, comprising a hole-guard secured to the outer wall surface of said casing and covering said orifice formed in said casing in radially spaced relation thereto said hole-guard being formed with at least one sidewise located opening the centre line axis of which is substantially at right angles to the centre line axis of said orifice while the plane of said opening is parallel with the centre line axis of said orifice and laterally offset with respect thereto.

Claim 6

An anti-theft device including an operator''s key-responsive safety lock comprising: a stationary hollow casing; a body portion forming a stator provided with a longitudinal bore and removably mounted in said casing; a tumbler cylinder forming a rotary plug rotatably fitted within said longitudinal bore of said stator and formed with a key-hole for receiving a removable plug-actuating key for rotating said plug in either direction to and from a plurality of angular positions; said casing being provided with a hole opening at least at the inner wall surface of said casing; said rotary plug being provided on its radially outer side wall surface with a recess adapted to be aligned in registering relationship with said hole through rotary displacement of said plug; said stator being formed with a transversely extending bore opening with its opposite ends towards said rotary plug and towards said hole of said casing, respectively; and a spring-loaded locking finger slidably mounted in said bore of said stator and engageable endwise with either of said hole in said casing and of said recess in said rotary plug, said locking finger having such a length that upon its engagement with said hole in said casing, said finger securely locks said stator within said casing and is disengaged from said recess in said rotary plug and that upon the engagement of said finger with said recess in said rotary plug, said finger disengages said hole in said casing thereby releasing said stator from said casing, said locking finger being biased by its spring so as to be urged towards its casing hole engaging position; wherein the improvement consists in the provision of means adapted to prevent said locking finger to be subjected to a coaxial radially inwards directed thrust force capable to cause said locking finger to be driven into the side wall of said rotary plug when the angular position of the latter is such that said recess in said plug is out of alignment with said locking finger, said hole in said casing extending throughout the thickness of the wall of said casing so as to open to the outside thereof, and wheRein said recess is formed by a longitudinally extending slot formed sidewise in said rotary plug and opening into said keyhole thereof; said locking finger consisting of a substantially T-shaped longitudinally enlarged plate engageable at its radially inner end with said slot whereas its radially outer end is formed with a small projection engageable with said hole in said casing, there being provided a pair of biasing springs co-operating with the side legs of said T-shaped plate, respectively.

Claim 7

An anti-theft device including an operator''s key-responsive safety lock comprising: a stationary hollow casing; a body portion forming a stator provided with a longitudinal bore and removably mounted in said casing; a tumbler cylinder forming a rotary plug rotatably fitted within said longitudinal bore of said stator and formed with a key-hole for receiving a removable plug-actuating key for rotating said plug in either direction to and from a plurality of angular positions; said casing being provided with a hole opening at least at the inner wall surface of said casing; said rotary plug being provided on its radially outer side wall surface with a recess adapted to be aligned in registering relationship with said hole through rotary displacement of said plug; said stator being formed with a transversely extending bore opening with its opposite ends towards said rotary plug and towards said hole of said casing, respectively; and a spring-loaded locking finger slidably mounted in said bore of said stator and engageable endwise with either of said hole in said casing and of said recess in said rotary plug, said locking finger having such a length that upon its engagement with said hole in said casing, said finger securely locks said stator within said casing and is disengaged from said recess in said rotary plug and that upon the engagement of said finger with said recess in said rotary plug, said finger disengages said hole in said casing thereby releasing said stator from said casing, said locking finger being biased by its spring so as to be urged towards its casing hole engaging position; wherein the improvement consists in the provision of means adapted to prevent said locking finger to be subjected to a coaxial radially inwards directed thrust force capable to cause said locking finger to be driven into the side wall of said rotary plug when the angular position of the latter is such that said recess in said plug is out of alignment with said locking finger, said hole in said casing extending throughout the thickness of the wall of said casing so as to open to the outside thereof, and wheRein said recess is formed by a longitudinally extending slot formed sidewise in said rotary plug and opening into said keyhole thereof; said locking finger consisting of a substantially T-shaped longitudinally enlarged plate engageable at its radially inner end with said slot whereas its radially outer end is formed with a small projection engageable with said hole in said casing, there being provided a pair of biasing springs co-operating with the side legs of said T-shaped plate, respectively.

Claim 8

A device according to claim 4, comprising a hole-guard secured to the outside wall surface of said casing and covering said through-hole in said casing in radially spaced relationship therewith, said hole-guard being formed with at least one sidewise located opening the centre line axis of which is substantially at right angles to the centre line axis of said through-hole in said casing while the plane of said opening is parallel to said centre line axis of said through-hole in said casing and laterally offset with respect thereto.

Claim 9

An anti-theft device including an operator''s key-responsive safety lock comprising: a stationary hollow casing; a body portion forming a stator provided with a longitudinal bore and removably mounted in said casing; a tumbler cylinder forming a rotary plug rotatably fitted within said longitudinal bore of said stator and formed with a key-hole for receiving a removable plug-actuating key for rotating said plug in either direction to and from a plurality of angular positions; said casing being provided with a through hole opening at the inner wall surface and outer wall surface of said casing; said stator being formed with a transversely extending bore opening with its opposite ends towards said rotary plug and towards said hole of said casing, respectively; and a spring-loaded locking finger slidably mounted in said bore of said stator and engageable endwise with said hole in said casing, said locking finger being biased by its spring so as to be urged towards its casing hole engaging position; said hole in said casing extending throughout the thickness of the wall of said casing so as to open to the outside thereof, a cam member operatively connected to said rotary plug to be rotatable therewith, a slot formed in said stator and extending in substantially parallel relation to the longitudinal axis of rotation of said plug, said transverse bore for accommodating said locking finger opening into said slot which opens itself towards said cam member; a spring-loaded plate element slidably mounted within said slot and urged by its biasing spring into endwise engagement with said cam member whereby said plate element is movable between two end positions, namely a stator-unlocking position into which it is pushed back against the force of its biasing spring by said cam member upon rotation of said plug to a given angular position and a stator-locking position into which it is pushed forward by its biasing spring when said cam member is rotated to any other angular position; and a through-hole formed in said plate member and large enough to allow said through hole to be engaged by said locking finger, said through hole in said plate element being so located that it registers with said locking finger when said plate element assumes said stator-unlocking position whereas said through-hole in said plate element is out of alignment with said locking finger for any other position of said plate element; the depth of said through-hole in said plate element and the length of said locking finger being sufficient to allow said locking finger to disengage said through-hole in said casing when said locking finger engages said through-hole in said plate element, and means adapted to prevent said locking finger from being subjected to a coaxial radially inwards directed thrust force capable of causing said locking finger to be driven into the plate element when the angular position of the rotary plug is such that said through-hole in said plate elemenT is out of alignment with said locking finger.

Claim 10

An anti-theft device including an operator''s key-responsive safety lock comprising: a stationary hollow casing; a body portion forming a stator provided with a longitudinal bore and removably mounted in said casing; a tumbler cylinder forming a rotary plug rotatably fitted within said longitudinal bore of said stator and formed with a key-hole for receiving a removable plug-actuating key for rotating said plug in either direction to and from a plurality of angular positions; said casing being provided with a through hole opening at the inner wall surface and outer wall surface of said casing; said stator being formed with a transversely extending bore opening with its opposite ends towards said rotary plug and towards said hole of said casing, respectively; and a spring-loaded locking finger slidably mounted in said bore of said stator and engageable endwise with said hole in said casing, said locking finger being biased by its spring so as to be urged towards its casing hole engaging position; said hole in said casing extending throughout the thickness of the wall of said casing so as to open to the outside thereof, a cam member operatively connected to said rotary plug to be rotatable therewith, a slot formed in said stator and extending in substantially parallel relation to the longitudinal axis of rotation of said plug, said transverse bore for accommodating said locking finger opening into said slot which opens itself towards said cam member; a spring-loaded plate element slidably mounted within said slot and urged by its biasing spring into endwise engagement with said cam member whereby said plate element is movable between two end positions, namely a stator-unlocking position into which it is pushed back against the force of its biasing spring by said cam member upon rotation of said plug to a given angular position and a stator-locking position into which it is pushed forward by its biasing spring when said cam member is rotated to any other angular position; and a through-hole formed in said plate member and large enough to allow said through hole to be engaged by said locking finger, said through hole in said plate element being so located that it registers with said locking finger when said plate element assumes said stator-unlocking position whereas said through-hole in said plate element is out of alignment with said locking finger for any other position of said plate element; the depth of said through-hole in said plate element and the length of said locking finger being sufficient to allow said locking finger to disengage said through-hole in said casing when said locking finger engages said through-hole in said plate element, and means adapted to prevent said locking finger from being subjected to a coaxial radially inwards directed thrust force capable of causing said locking finger to be driven into the plate element when the angular position of the rotary plug is such that said through-hole in said plate elemenT is out of alignment with said locking finger.

Claim 11

A device according to claim 6, including a movable lock-bolt slidably mounted in said stator and movable between an inoperative inwards retracted position and an operative outwards extended position; and cam means for actuating said lock-bolt and operatively connected to said rotary plug to be rotatable therewith; wherein said cam member is integral with said cam means.

Claim 12

A device according to claim 6, including a hole-guard secured to the outside wall surface of said casing and covering said through-hole in said casing in radially spaced relationship therewith, said hole-guard being formed with at least one sidewise located opening the centre line axis of which is substantially at right angles to the centre line axis of said through-hole in said casing while the plane of said opening is parallel to said centre line axis of said through-hole in said casing and laterally offset with respect thereto.