초록 ▼

A lock mechanism operated by inner and outer lever handles provides a security classroom function and includes inner and outer lock mechanisms that are independently switchable between locked and unlocked states by inner and outer lock cylinders and keys. The inner handle always operates the lock me

A lock mechanism operated by inner and outer lever handles provides a security classroom function and includes inner and outer lock mechanisms that are independently switchable between locked and unlocked states by inner and outer lock cylinders and keys. The inner handle always operates the lock mechanism to retract a latch bolt. The outer handle can only retract the latch bolt when both the inner and outer lock mechanisms are in the unlocked state. The outer key can retract the latch bolt when the inner lock mechanism is in the locked state, but cannot change the inner lock mechanism to the unlocked state or enable the outer handle, thereby ensuring positive control over the locked state of the outer handle from the inner side.

대표청구항 ▼

1. A security classroom function lock mechanism for mounting in a door comprising:an inner lock mechanism operable by an inner lock cylinder and corresponding inner key to change the inner lock mechanism between an unlocked state and a locked state; an outer lock mechanism operable by an outer lock

1. A security classroom function lock mechanism for mounting in a door comprising:an inner lock mechanism operable by an inner lock cylinder and corresponding inner key to change the inner lock mechanism between an unlocked state and a locked state; an outer lock mechanism operable by an outer lock cylinder and corresponding outer key to change the outer lock mechanism between an unlocked state and a locked state, the state of the inner and outer lock mechanisms being independent of each other; a latch mechanism including a latch bolt operable by inner and outer handles for movement between an extended position to latch the door and a retracted position to open the door; and a locking piece movable between a locked position and an unlocked position, the locking piece preventing the outer handle from moving the latch bolt to the retracted position when the locking piece is in the locked position, the locking piece being driven to the locked position from the unlocked position when either the inner lock mechanism or the outer lock mechanism is changed to the locked state and the locking piece being driven to the unlocked position when both the inner and outer lock mechanisms are changed to the unlocked state, the locking piece not being driven to the unlocked position from the locked position when the outer lock mechanism is changed to the unlocked state and the inner lock mechanism remains in the locked state. 2. The security classroom function lock mechanism of claim 1 wherein the locking piece includes two locking lugs projecting outward in opposite directions, the locking lugs engaging a lock core to prevent the outer handle from moving the latch bolt to the retracted position when the locking piece is in the locked position.3. The security classroom function lock mechanism of claim 1 wherein:the outer handle is non-rotatably mounted on an outer sleeve to turn the outer sleeve when the outer handle is rotated; the outer sleeve engages the locking piece and turns the locking piece when the outer sleeve is rotated by the outer handle; the locking piece includes an outer latch driver, the outer latch driver being turned with the locking piece when the outer handle is rotated; the outer latch driver forms an operative connection between the sleeve and the latch mechanism by engaging the latch mechanism to drive the latch bolt between the extended and retracted positions when the locking piece is in the unlocked position and by disengaging from the latch mechanism when the locking piece is in the locked position. 4. The security classroom function lock mechanism of claim 3 wherein the locking piece includes a key driven piece extending through the locking piece, the key driven piece being rotationally driven by the outer lock mechanism and the key driven piece engaging the latch mechanism when the locking piece is in the locked position to allow the latch bolt to be retracted by the outer lock cylinder when the locking piece is in the locked position.5. The security classroom function lock mechanism of claim 4 wherein the key driven piece includes a key end and a splined end, the splined end engaging the latch mechanism when the locking piece is in the locked position.6. The security classroom function lock mechanism of claim 5 wherein the key end is axially slidable relative to the splined end.7. The security classroom function lock mechanism of claim 6 further including a first spring biasing the key end of the key driven piece away from the splined end of the key driven piece.8. The security classroom function lock mechanism of claim 7 further including a second spring biasing the key end of the key driven piece towards the outer cylinder.9. The security classroom function lock mechanism of claim 1 further including:a lock core adapted to fit within a first opening in the door, the lock core including a bearing; and wherein the latch mechanism includes a latch bolt frame adapted to fit within a second opening in the door, the second opening extending from an edge of the door to the first opening in the door, the latch bolt frame being attached to and rigidly engaging the lock core, the latch bolt frame being engaged by the second opening in the door and the rigid engagement between the latch bolt frame and the lock core acting to prevent rotation of the lock core relative to the door. 10. The lock mechanism of claim 9 wherein the latch bolt frame is a tube.11. The security classroom function lock mechanism of claim 9 wherein the lock core includes a spring return and the outer handle is a lever handle, the spring return having sufficient strength to hold the outer lever handle at or above a level position.12. The security classroom function lock mechanism of claim 11 wherein the lock core is substantially cylindrical and the spring return includes a plurality of coil springs, the coil springs being located in curved contact with an inner surface of the lock core.13. The security classroom function lock mechanism of claim 12 wherein the latch bolt frame extends through the lock core and the spring return includes four coil springs, the coil springs comprising two pairs of coil springs, the pairs of coil springs being located on opposite sides of the latch bolt frame.14. The security classroom function lock mechanism of claim 9 wherein the latch mechanism further includes:a retractor mechanism for moving the latch bolt to the retracted position, and a latch retraction amplifier comprising: a retractor arm pivotally attached to the latch bolt frame at one end thereof and contacting the latch bolt at an opposite end thereof, and a retractor link extending between the retractor mechanism and the retractor arm the sleeve being connected to the retractor mechanism to move the latch bolt to the retracted position when the outer handle is rotated by no more than forty-five degrees. 15. The security classroom function lock mechanism of claim 9 wherein the outer handle is a lever handle and the lock core defines an angular mounting orientation of the outer lever handle relative to the lock core when the outer lever handle is at rest and the latch bolt frame engages the lock core at an angle less than 180 degrees relative to the angular mounting orientation of the outer lever handle on the lock core, whereby the outer lever handle is held at an angle greater than zero above horizontal when the second opening in the door and the latch bolt frame are horizontal.16. The security classroom function lock mechanism of claim 9 wherein:the outer handle is a lever handle and the outer lever handle is securely mounted on the shaft portion of the sleeve to prevent axial motion of the lever handle relative to the sleeve; and the sleeve further includes an enlarged portion having a diameter greater than an inner diameter of the bearing receiving the sleeve, the enlarged portion being held in contact with a face surface of the bearing by a retaining collar, the enlarged portion cooperating with the face surface of the bearing to prevent axial motion of the sleeve relative to the lock core. 17. The security classroom function lock mechanism of claim 16 wherein the retaining collar includes a lock notch, the lock notch engaging a lock pin to prevent the retaining collar from being removed.18. The security classroom function lock mechanism of claim 17 wherein the lock pin extends into the lock core.19. The security classroom function lock mechanism of claim 17 wherein the lock pin includes a head and the lock core includes a recess for receiving the head of the lock pin to allow the retaining collar to be positioned relative to the lock core, the head of the lock pin extending outward from the recess in the lock core and into the lock notch in the retaining collar after the retaining collar has been positioned relative to the lock core.20. The security classroom function lock mechanism of claim 17 wherein the lock pin extends into the latch bolt frame to hold the latch bolt frame relative to the lock core.21. The security classroom function lock mechanism of claim 9 wherein the lock core includes a cylindrical center core and a pair of bearing caps, a first one of the pair of bearing caps including the bearing and the other bearing cap including a second bearing.22. The security classroom function lock mechanism of claim 9 wherein the bearing of the lock core defines a rotational axis and the latch bolt frame extends through the lock core and engages the lock core on opposite sides of said rotational axis.23. The security classroom function lock mechanism of claim 1 wherein:the inner lock mechanism includes an inner latch driver connected to the inner handle and in continuous engagement with the latch mechanism as the inner lock mechanism moves between the unlocked state and the locked state; and the outer lock mechanism includes an outer latch driver and a key driven piece, the outer latch driver engaging the latch mechanism when the outer lock mechanism is in the unlocked state and disengaging from the latch mechanism when the outer lock mechanism is in the locked state, the key driven piece being engaged with the latch mechanism when the outer lock mechanism is in the locked state. 24. The security classroom function lock mechanism of claim 23 wherein the key driven piece includes two opposed ends, the two opposed ends being axially slidable relative to each other.25. The security classroom function lock mechanism of claim 24 further including a spring biasing the two opposed ends of the key driven piece away from each other.26. The security classroom function lock mechanism of claim 23 wherein the key driven piece of the outer lock mechanism is contacted by the inner latch driver of the inner lock mechanism and the inner latch driver of the inner lock mechanism includes a spiral slot for moving the inner latch driver axially and thereby moving the key driven piece of the outer lock mechanism.27. The security classroom function lock mechanism of claim 26 wherein the key driven piece of the outer lock mechanism includes a spiral slot for axially moving the outer latch driver and the key driven piece.28. The security classroom function lock mechanism of claim 23 wherein the key driven piece of the outer lock mechanism includes a spiral slot for axially moving the outer latch driver and the key driven piece.29. A security classroom function lock mechanism for mounting in a door comprising:an inner lock mechanism operable by an inner lock cylinder and corresponding inner key to change the inner lock mechanism between an unlocked state and a locked state; an outer lock mechanism operable by an outer lock cylinder and corresponding outer key to change the outer lock mechanism between an unlocked state and a locked state, the state of the inner and outer lock mechanisms being independent of each other; a latch mechanism including a latch bolt operable by inner and outer handles for movement between an extended position to latch the door and a retracted position to open the door; and a locking piece movable between a locked position and an unlocked position, the locking piece preventing the outer handle from moving the latch bolt to the retracted position when the locking piece is in the locked position, the locking piece being driven to the locked position from the unlocked position when either the inner lock mechanism or the outer lock mechanism is changed to the locked state and the locking piece being driven to the unlocked position when both the inner and outer lock mechanisms are changed to the unlocked state; wherein the outer handle is non-rotatably mounted on an outer sleeve to turn the outer sleeve when the outer handle is rotated; the outer sleeve engages the locking piece and turns the locking piece when the outer sleeve is rotated by the outer handle; the locking piece includes an outer latch driver, the outer latch driver being turned with the locking piece when the outer handle is rotated; the outer latch driver forms an operative connection between the sleeve and the latch mechanism by engaging the latch mechanism to drive the latch bolt between the extended and retracted positions when the locking piece is in the unlocked position and by disengaging from the latch mechanism when the locking piece is in the locked position; and the locking piece includes a key driven piece extending through the locking piece, the key driven piece being rotationally driven by the outer lock mechanism and the key driven piece engaging the latch mechanism when the locking piece is in the locked position to allow the latch bolt to be retracted by the outer lock cylinder when the locking piece is in the locked position. 30. A security classroom function lock mechanism for mounting in a door comprising:an inner lock mechanism operable by an inner lock cylinder and corresponding inner key to change the inner lock mechanism between an unlocked state and a locked state; an outer lock mechanism operable by an outer lock cylinder and corresponding outer key to change the outer lock mechanism between an unlocked state and a locked state, the state of the inner and outer lock mechanisms being independent of each other; a latch mechanism including a latch bolt operable by inner and outer handles for movement between an extended position to latch the door and a retracted position to open the door; a locking piece movable between a locked position and an unlocked position, the locking piece preventing the outer handle from moving the latch bolt to the retracted position when the locking piece is in the locked position, the locking piece being driven to the locked position from the unlocked position when either the inner lock mechanism or the outer lock mechanism is changed to the locked state and the locking piece being driven to the unlocked position when both the inner and outer lock mechanisms are changed to the unlocked state; a lock core adapted to fit within a first opening in the door, the lock core including a bearing; and the latch mechanism further including a latch bolt frame adapted to fit within a second opening in the door, the second opening extending from an edge of the door to the first opening in the door, the latch bolt frame being attached to and rigidly engaging the lock core, the latch bolt frame being engaged by the second opening in the door and the rigid engagement between the latch bolt frame and the lock core acting to prevent rotation of the lock core relative to the door; a retractor mechanism for moving the latch bolt to the retracted position, and a latch retraction amplifier comprising: a retractor arm pivotally attached to the latch bolt frame at one end thereof and contacting the latch bolt at an opposite end thereof, and a retractor link extending between the retractor mechanism and the retractor arm, the sleeve being connected to the retractor mechanism to move the latch bolt to the retracted position when the outer handle is rotated by no more than forty-five degrees. 31. A security classroom function lock mechanism for mounting in a door comprising:an inner lock mechanism operable by an inner lock cylinder and corresponding inner key to change the inner lock mechanism between an unlocked state and a locked state; an outer lock mechanism operable by an outer lock cylinder and corresponding outer key to change the outer lock mechanism between an unlocked state and a locked state, the state of the inner and outer lock mechanisms being independent of each other; a latch mechanism including a latch bolt operable by inner and outer handles for movement between an extended position to latch the door and a retracted position to open the door; and a locking piece movable between a locked position and an unlocked position, the locking piece preventing the outer handle from moving the latch bolt to the retracted position when the locking piece is in the locked position, the locking piece being driven to the locked position from the unlocked position when either the inner lock mechanism or the outer lock mechanism is changed to the locked state and the locking piece being driven to the unlocked position when both the inner and outer ,lock mechanisms are changed to the unlocked state; and a lock core adapted to fit within a first opening in the door, the lock core including a bearing; the latch mechanism further includes a latch bolt frame adapted to fit within a second opening in the door, the second opening extending from an edge of the door to the first opening in the door, the latch bolt frame being attached to and rigidly engaging the lock core, the latch bolt frame being engaged by the second opening in the door and the rigid engagement between the latch bolt frame and the lock core acting to prevent rotation of the lock core relative to the door; the outer handle comprising a lever handle securely mounted on the shaft portion of the sleeve to prevent axial motion of the lever handle relative to the sleeve; and the sleeve further includes an enlarged portion having a diameter greater than an inner diameter of the bearing receiving the sleeve, the enlarged portion being held in contact with a face surface of the bearing by a retaining collar, the enlarged portion cooperating with the face surface of the bearing to prevent axial motion of the sleeve relative to the lock core. 32. A security classroom function lock mechanism for mounting in a door comprising:an inner lock mechanism operable by an inner lock cylinder and corresponding inner key to change the inner lock mechanism between an unlocked state and a locked state; an outer lock mechanism operable by an outer lock cylinder and corresponding outer key to change the outer lock mechanism between an unlocked state and a locked state, the state of the inner and outer lock mechanisms being independent of each other; a latch mechanism including a latch bolt operable by inner and Outer handles for movement between an extended position to latch the door and a retracted position to open the door; and a locking piece movable between a locked position and an unlocked position, the locking piece preventing the outer handle from moving the latch bolt to the retracted position when the locking piece is in the locked position, the locking piece being driven to the locked position from the unlocked position when either the inner lock mechanism or the outer lock mechanism is changed to the locked state and the locking piece being driven to the unlocked position when both the inner and outer lock mechanisms are changed to the unlocked state; the inner lock mechanism further including an inner latch driver connected to the inner handle and in continuous engagement with the latch mechanism as the inner lock mechanism moves between the unlocked state and the locked state; and the outer lock mechanism further including an outer latch driver and a key driven piece, the outer latch driver engaging the latch mechanism when the outer lock mechanism is in the unlocked state and disengaging from the latch mechanism when the outer lock mechanism is in the locked state, the key driven piece being engaged with the latch mechanism when the outer lock mechanism is in the locked state.