Door fastening units

Claim 2

A door fastening device for use in co-operation with a door lock and comprising, in combination, a casing, bolt members mounted at mutually remote regions of the casing, guide means on the casing acting on the bolt members constraining them to slide between a retracted position in the casing and a projecting position, actuating meAns disposed between the bolt members, said actuating means comprising two levers extending respectively towards said mutually remote regions of the casing, a pivot means for each lever being disposed intermediate its length within the casing and mounting means engaging the pivot means to locate the levers on the casing in a manner permitting variation of the pivot means positions to regulate the position of said levers relative to the casing in the direction of sliding movement of the bolt members, said levers being thereby arranged to be engaged by a bolt of said associated lock, and interconnection means connecting the levers to the bolt members at said mutually remote regions in such a manner that displacement of the actuating means by the shooting of said bolt causes said sliding movement of the bolt members from their retracted positions to their projecting positions.

Claim 3

A door fastening device for use in co-operation with a door lock and comprising, in combination, a casing, bolt members mounted at mutually remote regions of the casing, guide means on the casing acting on the bolt members constraining them to slide between a retracted position in the casing and a projecting position, actuating means disposed between the bolt members, mounting means for locating said actuating means on the casing and permitting the position of said actuating means to be regulated relative to the casing in the direction of sliding movement of the bolt members, said actuating means being thereby arranged to be engaged by a bolt of said associated lock, interconnection means connecting the actuating means to the bolt members in such a manner that displacement of the actuating means by the shooting of said bolt causes said sliding movement of the bolt members from their retracted positions to their projecting positions, a cover enclosing the casing, a striker plate on the cover and respective overlying apertures in the striker plate and cover for the passage of the lock bolt, the aperture of said plate being smaller than the aperture of said cover, securing means fixing the striker plate on the cover permitting adjustment of said plate relative to the casing to determine the position of engagement of the lock bolt with the actuating means transverse to the plane of sliding movement of the bolt members.

Claim 4

A door fastening device for use in co-operation with a door lock and comprising, in combination, a casing, bolt members mounted at mutually remote regions of the casing, guide means on the casing acting on the bolt members constraining them to slide between a retracted position in the casing and a projecting position, actuating means disposed between the bolt members, mounting means for locating said actuating means on the casing and permitting the position of said actuating means to be regulated relative to the casing in the direction of sliding movement of the bolt members, said actuating means being thereby arranged to be engaged by a bolt of said associated lock, interconnection means connecting the actuating means to the bolt members in such a manner that displacement of the actuating means by the shooting of said bolt causes said sliding movement of the bolt members from their retracted positions to their projecting positions, a cover enclosing the casing, a striker plate on the cover and respective overlying apertures in the striker plate and cover for the passage of the lock bolt, the aperture of said plate being smaller than the aperture of said cover, securing means fixing the striker plate on the cover permitting adjustment of said plate relative to the casing to determine the position of engagement of the lock bolt with the actuating means transverse to the plane of sliding movement of the bolt members.

Claim 5

A device according to claim 2 wherein the actuating means comprise two levers extending towards opposite end regions of the casing and engageable by the lock bolt, a pivot means for each lever being disposed intermediate its length within the casing and said connection means interconnecting the levers with respective bolt members at said end regions.

Claim 6

A device according to claim 3 wherein said mounting means engage the pivot means to permit variation of the pivot positions of the levers for said adjustment of actuating means.

Claim 7

A device according to claim 1 wherein the pivot means of the levers comprise apertures for the passage of members of the mounting means that thereby form fulcrums on which the levers can pivot.

Claim 8

A device according to claim 1 wherein said pivot means of the levers define pivot axes that are spaced further from the bolt member connections than from the regions of engagement of the levers by the door bolt.

Claim 9

A device according to claim 1 wherein a pin interconnects each lever with its bolt member, a guide slot in the casing being engaged by said pin for said rectilinear movement and an elongated aperture in the lever receiving the pin so as to permit relative movement between the aperture and the pin in a direction transverse to the direction of movement of the bolt member.

Claim 10

A device according to claim 2 wherein the striker plate is capable of displacement on the casing cover away from said plane of movement of the bolt members while remaining attached to the casing cover, respective edges of the overlying apertures that are those edges further from said plane of movement thereby being brought into registration with each other.

Claim 11

A door fasteNing device for use in co-operation with a door lock having a bolt that can be shot to extend between a member of a door frame and a door fitting an opening in said frame, the device comprising, in combination, a casing, screw means engageable with the inside face of a member of the door or frame to secure the casing to said face, bolt members mounted at mutually remote regions of the casing, guide means acting on the bolt members constraining them to slide from a retracted position to an extended operative position, actuating means disposed between the bolt members and arranged to be engaged by said bolt of said associated lock, interconnection means connecting the actuating means to the bolt member in such a manner that engagement of the actuating means by the shooting of said bolt causes said sliding movement of the bolt members from their retracted positions to their extended operative positions, attaching means passing through said actuating means to secure them directly to said inside face, a cover enclosing said casing and actuating means, screw means being provided to secure the cover in position, said screw means being engageable with an edge of said member of the door or frame that is hidden when the door is closed.

Claim 12

A door fasteNing device for use in co-operation with a door lock having a bolt that can be shot to extend between a member of a door frame and a door fitting an opening in said frame, the device comprising, in combination, a casing, screw means engageable with the inside face of a member of the door or frame to secure the casing to said face, bolt members mounted at mutually remote regions of the casing, guide means acting on the bolt members constraining them to slide from a retracted position to an extended operative position, actuating means disposed between the bolt members and arranged to be engaged by said bolt of said associated lock, interconnection means connecting the actuating means to the bolt member in such a manner that engagement of the actuating means by the shooting of said bolt causes said sliding movement of the bolt members from their retracted positions to their extended operative positions, attaching means passing through said actuating means to secure them directly to said inside face, a cover enclosing said casing and actuating means, screw means being provided to secure the cover in position, said screw means being engageable with an edge of said member of the door or frame that is hidden when the door is closed.

Claim 13

A door fastening device according to claim 9 wherein respective receiving apertures for said bolt members and lock bolt having respective edges that are simultaneously engageable by the respective bolt members and bolt, when the door is displaced from its fully closed position with the bolt members and bolt in their extended or shot positions.

Claim 14

A device according to claim 1 further comprising a cover over the casing, guides on said cover for the bolt members, securing elements for fixing the cover in position on the door and extending substantially in the direction of sliding movement of said bolt members so as to be stressed in shear when forcible opening of the locked door is attempted against the resistance offered by the bolt members.

Claim 15

A device according to claim 11 wherein said securing elements are located on a face of the outer cover that is hidden when the door is closed.