Door operator system

1 . An overhead door operator system, comprising:

a door frame adjacent an opening comprising a first frame section at a first side of the opening and a second frame section at a second side of the opening;

a door arranged to be moved between an open (O) and closed (C) position, the door being movably connected to the door frame;

a drive unit mounted on the door, the drive unit comprising at least one motor arranged to move the door from the closed position (C) to the open position, and

an elongated transmission member extending along the first side of the opening and the first frame section,

whereby the drive unit further comprises a driven transmission member in driving connection with the at least one motor, the driven transmission member being movably connected to the elongated transmission member and arranged to interplay with said elongated transmission member for driving the driven transmission member along said elongated transmission member by means of the elongated transmission member at least partially wrapping around the driven transmission member;

at least one guide member mounted to the door arranged to interplay with the elongated transmission member for guiding the door along the elongated transmission member by means of the elongated transmission member at least partially wrapping around the at least one guide member; and

a first set of guide rollers mounted to the door arranged to interplay with the first frame section and a second set of guide rollers arranged to interplay with the second frame section, wherein the at least one guide member is arranged coaxially with one of the guide rollers,

wherein a top end of the elongated transmission member is fixedly mounted to the frame and a bottom portion of the elongated transmission member engages a console at a fixed position proximal to a floor of the opening, wherein the bottom portion extends around the console and upward, and wherein the bottom portion is connected to a connection point on the frame by a biasing member, wherein the console and the connection point are fixed with respect to one another on the frame,

wherein the biasing member comprises a spring arrangement connected at one end with the bottom end of the elongated transmission member and extending upwardly and connected at another end with the connection point on the frame.

2 . The overhead door operator system according to claim 1 , wherein the elongated transmission member is in the form of a suspended bendable transmission member.

3 . The overhead door operator system according to claim 1 , wherein the biasing member is spring-loaded.

4 . The overhead door operator system according to claim 1 , whereby the drive unit further comprises a reduction gearing, said reduction gearing connecting the driven transmission member and the at least one motor.

5 . The overhead door operator system according to claim 1 , further comprising a resilient panel attached to the door and extending from a bottom horizontal edge of the door, said resilient panel being arranged to come into contact with a floor of the opening when the door is in the closed position (C).

6 . The overhead door operator system according to claim 1 , wherein the elongated transmission member is a belt.

7 . The overhead door operator system according to claim 6 , wherein the belt is cogged.

8 . The overhead door operator system according to claim 1 , wherein the elongated transmission member is a chain.

9 . The overhead door operator system according to claim 8 , wherein the at least one guide member is a cogged wheel.

10 . The overhead door operator system according to claim 1 , wherein the door comprises a plurality of horizontal and interconnected sections.

11 . The overhead door operator system according to claim 10 , wherein the drive unit is mounted on a section of the door wherein the first and second sets of guide rollers each comprise an upper guide roller and a lower guide roller, wherein the upper and lower guide rollers of the first set extend towards the first frame section, and wherein the upper and lower guide rollers of the second set extend toward the second frame section.

12 . The overhead door operator system according to claim 11 , wherein the drive unit is mounted to a bottommost section of the door and the first and second lower guide rollers are disposed adjacent to a bottom horizontal end phase of the bottommost section.

13 . The overhead door operator system according to claim 12 , wherein the upper guide rollers are disposed adjacent to a top horizontal end phase of the bottommost section.

14 . The overhead door operator system according to claim 13 , wherein each of the at least one guide members are arranged coaxially with a respective one of the guide rollers.

15 . The overhead door operator system according to claim 14 , wherein the at least one guide member comprises a first upper guide member arranged coaxially with the first upper guide roller and a first lower guide member arranged coaxially with the first lower guide roller.

16 . The overhead door operator system according to claim 15 , wherein the elongated transmission member comprises a first elongated transmission member extending along the first side of the opening and the first frame section and a second elongated transmission member extending along the second side of the opening and the second frame section, wherein the driven transmission member comprises first and second driven transmission members arranged to interplay with the first and second elongated transmission members by means of the first and second elongated transmission members at least partially wrapping around the first and second driven transmission members, respectively.

17 . The overhead door operator system according to claim 16 , further comprising at least one guide member mounted to the door arranged to interplay with the second elongated transmission member for guiding the door along the second elongated transmission member.

18 . The overhead door operator system according to claim 17 , further comprising a second upper guide member arranged coaxially with the second upper guide roller and a second lower guide member arranged coaxially with the second lower guide roller, wherein the first driven transmission member is arranged between the first upper and lower guide members and the second driven transmission member is arranged between the second upper and lower guide members.

19 . The overhead door operator system according to claim 16 , wherein the at least one motor comprises a first motor and a second motor being in driving connection with the first and second driven transmission members, respectively.

20 . The overhead door operator system according to claim 19 , wherein the drive unit further comprises a first reduction gearing connecting the first drive transmission member and the first motor and a second reduction gearing connecting the second driven transmission member and the second motor.

21 . The overhead door operator system according to claim 16 , wherein the at least one motor is in driving connection with the first and second driven transmission members.

22 . The overhead door operator system according to claim 14 , wherein one of the guide rollers and one of the at least one guide members are arranged coaxially to each other adjacent to a bottom horizontal edge of the door.