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An apparatus for a cylindrical deadbolt assembly indicates whether the deadbolt is locked or unlocked. The apparatus comprises a trim piece, such as an escutcheon or collar, configured to be mounted on the inside face of a door, a dial mounted on an inside surface of the trim piece, and a cam. The t

An apparatus for a cylindrical deadbolt assembly indicates whether the deadbolt is locked or unlocked. The apparatus comprises a trim piece, such as an escutcheon or collar, configured to be mounted on the inside face of a door, a dial mounted on an inside surface of the trim piece, and a cam. The trim piece comprises one or more windows for displaying information from the dial. The dial is operative to travel between first and second positions to provide a first indication when the deadbolt is locked and a second indication when the deadbolt is unlocked. The cylinder tail piece turns the cam to move the dial between its first and second positions.

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1. An apparatus for indicating the setting of a cylindrical deadbolt assembly on a door having a keyed cylinder assembly mounted in a substantially coaxial arrangement with a cylindrical bore of the door and operable to turn an axially oriented cylinder tail piece that extends into the door bore to

1. An apparatus for indicating the setting of a cylindrical deadbolt assembly on a door having a keyed cylinder assembly mounted in a substantially coaxial arrangement with a cylindrical bore of the door and operable to turn an axially oriented cylinder tail piece that extends into the door bore to operate a bolt assembly, the apparatus comprising: an escutcheon configured to mount between the door and the keyed cylinder assembly, the escutcheon comprising an exterior section and a cylindrical interior section having a cylindrical axis, wherein the exterior section is configured to be mounted to the door's exterior surrounding the door bore, and the cylindrical interior section is configured to extend about the cylindrical axis from the exterior section into the door bore;a rotary indicator mounted on an inside surface of the exterior section of the escutcheon, the indicator being operative to rotate between first and second positions to provide a first indication when the deadbolt assembly is locked and a second indication when the deadbolt assembly is unlocked; anda mechanical coupling configured to rotate the indicator between its first and second positions, the mechanical coupling comprising a hub and a link rigidly connected to the hub, wherein: the hub is configured to be mounted inside the door bore, adjacent a base of the cylindrical interior section opposite the exterior section, and to receive and be turned by the cylinder tail piece, wherein the hub includes a distal portion that extends in a radial direction beyond boundaries of the cylindrical interior section; andthe link projects perpendicularly from the distal portion of the hub so that upon assembly of the mechanical coupling to the indicator and escutcheon, the link extends from the hub to the indicator in a direction parallel to the cylindrical axis of the escutcheon's cylindrical interior section;wherein the configuration of the hub, link and indicator configures them to be positioned exclusively within and about the cylindrical door bore, without traversing through any other cuts to the door, thereby enabling the apparatus to be installed in a door, which has only a single cylindrical bore for receiving a key cylinder, without making new preparatory cuts in the door. 2. The apparatus of claim 1, wherein the indicator comprises a ring, the first and second indications are angularly distributed from one another, and the mechanical coupling is configured to rotate the ring between its first and second positions. 3. The apparatus of claim 2, wherein the ring has a central opening, a slot is provided along the perimeter of a central opening, and the ring is mechanically coupled to the cylinder tail piece through the slot. 4. The apparatus of claim 1, wherein the hub is configured with an aperture through which the cylinder tail piece is inserted to mount the hub on the cylinder tail piece. 5. The apparatus of claim 4, wherein the indicator comprises a ring, and the link consists essentially of a pin carried by the distal portion of the hub, the pin configured to fit within a slot of the ring. 6. The apparatus of claim 1, wherein the escutcheon comprises one or more windows for displaying information from the indicator. 7. The apparatus of claim 1, wherein the escutcheon comprises an outer lip configured to contact the inside face of the door, a cylindrical shaped central portion configured to extend into the cylindrical bore of the door, and a seat between the cylindrically shaped central portion and the outer lip, the seat facilitating rotation of the indicator between its first and second positions. 8. The apparatus of claim 1, wherein the escutcheon comprises first and second apertures for receiving mounting screws of the deadbolt assembly and a third aperture for passage therethrough of the cylinder tail piece. 9. The apparatus of claim 1, wherein the link is linear. 10. The apparatus of claim 9, wherein the hub, including the distal portion, is flat. 11. The apparatus of claim 10, wherein the link is perpendicular to the hub. 12. An apparatus for indicating the setting of a cylindrical deadbolt assembly on a door having a keyed cylinder assembly mounted in a substantially coaxial arrangement with a bore of the door and operable to turn an axially oriented cylinder tail piece that extends into the door bore to operate a bolt assembly, the apparatus comprising: an escutcheon configured to mount between the door and the keyed cylinder assembly, the escutcheon comprising an exterior section and an interior section, wherein the exterior section is configured to be mounted to the door's exterior surrounding the door bore, and the interior section is axially displaced from the exterior section so as to extend into the door bore;an indicator mounted on an inside surface of the exterior section of the escutcheon, the indicator being operative to travel between first and second positions to provide a first indication when the deadbolt assembly is locked and a second indication when the deadbolt assembly is unlocked; anda mechanical coupling configured to rotate the indicator between its first and second positions, the mechanical coupling comprising a hub and a link, wherein: the hub is configured to be mounted inside the door bore, adjacent a side of the interior section opposite the exterior section, and to receive and be turned by the cylinder tail piece, wherein the hub includes a distal portion that extends in a radial direction beyond boundaries of the interior section; andupon mounting to a door, the link extends at an angle from the distal portion of the hub, which is axially displaced from the indicator, toward the indicator;wherein the indicator comprises a ring, the first and second indications are angularly distributed from one another, and the mechanical coupling is configured to rotate the ring between its first and second positions;wherein the ring has a central opening, dual slots are provided along the perimeter of a central opening, and the ring is mechanically coupled to the cylinder tail piece through a selected one of the dual slots depending on whether the door is a right-handed or left-handed door. 13. An apparatus for indicating the setting of a cylindrical deadbolt assembly on a door having a keyed cylinder assembly mounted in a substantially coaxial relationship with a cylindrical bore of the door and operable to turn an axially oriented cylinder tail piece that extends into the door bore to operate a bolt assembly, the apparatus comprising: an inside collar configured to mount between the door and the keyed cylinder assembly, the inside collar comprising an exterior section and a cylindrical interior section having a cylindrical axis, wherein the exterior section is configured to be mounted to the door's exterior surrounding the door bore, and the cylindrical interior section is configured to extend about the cylindrical axis from the exterior section into the door bore;a rotary indicator mounted on an inside surface of the exterior section of the inside collar, the indicator being operative to rotate between first and second positions to provide a first indication when the deadbolt assembly is locked and a second indication when the deadbolt assembly is unlocked; anda mechanical coupling configured to rotate the indicator between its first and second positions, the mechanical coupling comprising a hub and a link rigidly connected to the hub, wherein:the hub is configured to be mounted adjacent a base of the cylindrical interior section opposite the exterior section, and to receive and be turned by the cylinder tail piece, wherein the hub includes a distal portion that extends in a radial direction beyond boundaries of the cylindrical interior section; andthe link projects perpendicularly from the distal portion of the hub so that upon assembly of the mechanical coupling to the rotary indicator and inside collar, the link extends from the hub to the indicator in a direction parallel to the cylindrical axis of the escutcheon's cylindrical interior section;wherein the configuration of the hub, link and indicator configures them to be positioned exclusively within and about the cylindrical door bore, without traversing through any other cuts to the door, thereby enabling the apparatus to be installed in a door, which has only a single cylindrical bore for receiving a key cylinder, without making new preparatory cuts in the door. 14. The apparatus of claim 13, wherein the indicator comprises a rotary member, the first and second indications are angularly distributed from one another, and the mechanical coupling is configured to rotate the rotary member between its first and second positions. 15. The apparatus of claim 14, wherein the rotary member has a central opening, a slot is provided along the perimeter of a central opening, and the rotary member is mechanically coupled to the cylinder tail piece through the slot. 16. The apparatus of claim 13, wherein the hub is configured with an aperture through which the cylinder tail piece is inserted to mount the mechanical coupling on the cylinder tail piece. 17. The apparatus of claim 16, wherein the indicator comprises a rotary member, and the link consists essentially of a pin carried by an arm coupled to the hub, the pin configured to fit within a slot of the rotary member. 18. The apparatus of claim 13, wherein the inside collar provides one or more windows for displaying information from the indicator. 19. The apparatus of claim 13, wherein the inside collar comprises an outer lip configured to contact the inside face of the door and a seat between the cylindrical interior section of the inside collar and the outer lip, the seat facilitating rotation of the indicator between its first and second positions. 20. A cylindrical deadbolt assembly comprising: a bolt assembly;a keyed cylinder assembly mounted in a substantially coaxial arrangement with a cylindrical bore of a door and operable to turn an axially oriented cylinder tail piece that extends into the door bore to operate the bolt assembly;an escutcheon configured to mount between the door and the keyed cylinder assembly, the escutcheon comprising an exterior section and an interior section, wherein the exterior section is configured to be mounted to the door's exterior surrounding the door bore, and the interior section is displaced from the exterior section about an axis of the interior section so as to extend into the door bore;an indicator mounted on an inside surface of the exterior section of the escutcheon, the indicator being operative to travel between first and second positions to provide a first indication when the deadbolt assembly is locked and a second indication when the deadbolt assembly is unlocked; anda mechanical coupling configured to move the indicator between its first and second positions, the mechanical coupling comprising a hub and a link rigidly connected to the hub, wherein:the hub is configured to be mounted inside the door bore, adjacent a base of the interior section opposite the exterior section, and to receive and be turned by the cylinder tail piece, wherein the hub includes a distal portion that extends in a radial direction beyond boundaries of the interior section; andthe link projects perpendicularly from the distal portion of the hub so that upon assembly of the mechanical coupling to the indicator and escutcheon, the link extends from the hub to the indicator in a direction parallel to the cylindrical axis of the escutcheon's cylindrical interior section;wherein the configuration of the hub, link and indicator configures them to be positioned exclusively within and about the cylindrical door bore, without traversing through any other cuts to the door, thereby enabling the apparatus to be installed in a door, which has only a single cylindrical bore for receiving a key cylinder, without making new preparatory cuts in the door. 21. An apparatus for indicating the setting of a cylindrical deadbolt assembly on a door having a keyed cylinder assembly mounted in a substantially coaxial relationship with a bore of the door and operable to turn an axially oriented cylinder tail piece that extends into the door bore to operate a bolt assembly, the apparatus comprising: an inside collar configured to mount between the door and the keyed cylinder assembly, the inside collar having an exterior section and an interior section, wherein the exterior section is configured to be mounted to the door's exterior surrounding the door bore, and the interior section extends in an axial direction from the exterior section into the door bore;an indicator mounted on an inside surface of the exterior section of the inside collar, the indicator being operative to travel between first and second positions to provide a first indication when the deadbolt assembly is locked and a second indication when the deadbolt assembly is unlocked; anda mechanical coupling configured to rotate the indicator between its first and second positions, the mechanical coupling comprising a hub and a link, wherein:the hub is configured to be mounted adjacent a side of the interior section opposite the exterior section, and to receive and be turned by the cylinder tail piece, wherein the hub includes a distal portion that extends in a radial direction beyond boundaries of the interior section; andupon mounting to a door, the link extends from the distal portion of the hub, which is axially displaced from the indicator, toward the indicator;wherein the indicator comprises a rotary member, the first and second indications are angularly distributed from one another, and the mechanical coupling is configured to rotate the rotary member between its first and second positions;wherein the rotary member has a central opening, dual slots are provided along the perimeter of a central opening, and the rotary member is mechanically coupled to the cylinder tail piece through a selected one of the dual slots depending on whether the door is a right-handed or left-handed door.