Latch bolt operating device

A latch bolt operating device adapted for use with a latch bolt unit that is installed in a door panel, the latch bolt unit including a bolt for locking the door panel to a door frame, and a latch driving mechanism connected operably to the bolt for moving the bolt between extended and retracted positions, said latch bolt operating device comprising:

• an exterior operating unit including:
• a key-operated plug-and-cylinder lock assembly having a front part formed with a radial flange, a rear part, and an actuating member which extends axially from said rear part and which is adapted to engage operably the latch driving mechanism of the latch bolt unit to move the bolt between the extended and retracted positions;
• and
• an exterior housing including an outer annular cover, an inner annular cover and an annular shield;
• said outer annular cover including a first front end portion and a first rear end portion, said outer annular cover being formed with a first axial hole which extends through said first front and said first rear end portions to permit extension of said rear part of said lock assembly therethrough, said first front end portion having a first annular recessed section around said first axial hole for receiving said radial flange of said lock assembly therein, said first rear end portion being formed with a first annular shoulder which includes a first radial part that extends outwardly from said first rear end portion, and a first axial part that extends rearwardly from said first radial part;
• said inner annular cover being received in said outer annular cover and having a second front end portion, a second rear end portion and a second axial hole which extends through said second front and said second rear end portions to permit extension of said rear part of said lock assembly therethrough, said second front end portion having a second annular recessed section around said second axial hole for receiving said first annular recessed section of said outer annular cover therein, said second rear end portion being formed with a second annular shoulder which includes a second radial part that extends outwardly from said second rear end portion, and a second axial part that extends rearwardly from said second radial part;
• said annular shield extending into said second rear end portion of said inner annular cover and being formed with a central hole through which said actuating member of said lock assembly extends;
• said second axial part being bent so as to clamp a peripheral portion of said annular shield toward said second radial part in order to retain said annular shield in said inner annular cover;
• and
• an interior operating unit including:
• a torque bar having a handle portion and an actuating spindle which extends from said handle portion, said actuating spindle being adapted to be connected operably to the latch driving mechanism of the latch bolt unit to permit movement of the bolt between the extended and retracted positions when said torque bar is rotated;
• an interior housing including an outer cover formed with a spindle hole through which said actuating spindle extends rotatably;
• and
• positioning means for positioning releasably said torque bar in a first position corresponding to the extended position of the bolt and a second position corresponding to the retracted position of the bolt.

A latch bolt operating device adapted for use with a latch bolt unit that is installed in a door panel, the latch bolt unit including a bolt for locking the door panel to a door frame, and a latch driving mechanism connected operably to the bolt for moving the bolt between extended and retracted positions, said latch bolt operating device comprising:

• an exterior operating unit including:
• a key-operated plug-and-cylinder lock assembly having a front part formed with a radial flange, a rear part, and an actuating member which extends axially from said rear part and which is adapted to engage operably the latch driving mechanism of the latch bolt unit to move the bolt between the extended and retracted positions;
• and
• an exterior housing including an outer annular cover, an inner annular cover and an annular shield;
• said outer annular cover including a first front end portion and a first rear end portion, said outer annular cover being formed with a first axial hole which extends through said first front and said first rear end portions to permit extension of said rear part of said lock assembly therethrough, said first front end portion having a first annular recessed section around said first axial hole for receiving said radial flange of said lock assembly therein, said first rear end portion being formed with a first annular shoulder which includes a first radial part that extends outwardly from said first rear end portion, and a first axial part that extends rearwardly from said first radial part;
• said inner annular cover being received in said outer annular cover and having a second front end portion, a second rear end portion and a second axial hole which extends through said second front and said second rear end portions to permit extension of said rear part of said lock assembly therethrough, said second front end portion having a second annular recessed section around said second axial hole for receiving said first annular recessed section of said outer annular cover therein, said second rear end portion being formed with a second annular shoulder which includes a second radial part that extends outwardly from said second rear end portion, and a second axial part that extends rearwardly from said second radial part;
• said annular shield extending into said second rear end portion of said inner annular cover and being formed with a central hole through which said actuating member of said lock assembly extends;
• said second axial part being bent so as to clamp a peripheral portion of said annular shield toward said second radial part in order to retain said annular shield in said inner annular cover.