Modular projector lift

• US 6,073,892 A
• Filed: 06/11/1996
• Issued: 06/13/2000
• Est. Priority Date: 06/11/1996
• Status: Expired due to Fees

• Current Assignee: Legrand AV Inc. (Legrand SA)
• Original Assignee: Chief Manufacturing Incorporated (Legrand SA)
• Inventors: Dittmer, Jay S.
• Primary Examiner(s): Stodola, Daniel P.
• Assistant Examiner(s): Strimbu, Gregory J.
• Application Number:
  US08/661,609
• Time in Patent Office: 1,463 Days
• Field of Search: 248/404, 248/157, 248/422, 248/327, 248/346.07, 248/333, 74/89.21, 348/825, 348/826, 348/827, 348/836, 348/839, 188/171
• US Class Current: 248/157
• CPC Class Codes: F16D 2121/22 for releasing a normally applied brake
• CPC Class Codes: F16D 2125/64 Levers
• CPC Class Codes: F16D 55/36 Brakes with a plurality of rotating discs all lying side by side
• CPC Class Codes: F16M 11/046 adapted to upward-downward translation movement
• CPC Class Codes: F16M 11/18 with mechanism for moving the apparatus relatively to the stand
• CPC Class Codes: F16M 13/027 Ceiling supports
• CPC Class Codes: F16M 2200/08 Foot or support base
• CPC Class Codes: H04N 9/3141 Constructional details thereof details not peculiar to the presence of an electronic spatial light modulator G03B21/14
• CPC Class Codes: Y10T 74/1884 with sprocket wheel

Abstract

A modular projector lift system for moving a projection device along a path between an extended position and a retracted position. The modular projector lift system includes a drive assembly expandable along a first axis. At least one movable support is mechanically engagable with the drive assembly at a plurality of positions along the first axis. The movable support moves the projection device between the extended position and the retracted position. A brake mechanism is optionally included for retaining the projection device at a particular location. The brake mechanism includes a plurality of rotating brake plates connected to the drive shaft of the drive assembly and a plurality of static brake plates connected to the drive assembly compressively engaged with the rotating brake plates. Adjustable limit switches are optionally provided for adjusting a location of the retracted and the extended positions along the path.

Claims

1. A modular projector lift system for moving a projection device along a path between an extended position and a retracted position, the modular projector lift system comprising:

a motorized drive assembly expandable along a first axis, the drive assembly comprising a motor having a telescoping drive shaft; and

at least one movable support movable along a second axis which is generally perpendicular to the first axis for moving the projection device between the extended position and the retracted position, the at least one movable support mechanically engaged with the drive assembly at one of a plurality of positions along the first axis and being movable by the drive assembly along the second axis.

2. The system of claim 1 wherein the at least one movable support is telescopically engaged with the drive assembly.

3. The system of claim 1 wherein the telescoping drive shaft of the drive assembly is oriented parallel to the first axis.

4. The system of claim 1 wherein the path is vertical.

5. The system of claim 1 wherein the retracted position is vertically off-set from the extended position.

6. The system of claim 1 wherein the path is horizontal.

7. The system of claim 1 wherein the retracted position is horizontally off-set from the extended position.

8. The system of claim 1 wherein the at least one movable support comprises at least one telescoping extrusion member.

9. The system of claim 1 wherein the at least one movable support comprises a pair of movable supports each having an adjustable separation along the first axis relative to the drive assembly.

10. The system of claim 1 further comprising a false surface means for concealing the projection device when in the retracted position.

11. The system of claim 1 wherein the drive assembly further comprises a drive chain coupled to the at least one movable support.

12. The system of claim 1 wherein the drive assembly further comprises a brake mechanism for maintaining a position of the at least one movable support relative to the drive assembly.

13. The system of claim 12 wherein the brake mechanism is activated when electric power to the drive assembly is reversed.

14. The system of claim 12 wherein the brake mechanism comprises a plurality of rotating brake plates connected to the drive shaft, the drive shaft coupling the drive assembly to the at least one movable support, and a plurality of static brake plates connected to the drive assembly and compressively engaged with the rotating brake plates, respectively.

15. The system of claim 14 wherein the brake mechanism comprises means for providing variable levels of compressive engagement between the rotating and the static brake plates.

16. The system of claim 1 wherein the drive assembly further includes an adjustable limit switch for adjusting a location of the retracted position along the path.

17. The system of claim 1 wherein the drive assembly further includes an adjustable limit switch for adjusting a location of the extended position along the path.

18. The system of claim 1 further including at least one emergency pressure switch for reversing movement of the projection device along the path.

19. The system of claim 1 wherein the at least one movable support further comprises a platform for supporting the projection device and pressure switch means located along a perimeter of the platform for reversing movement of the projection device along the path.

20. A modular projector lift system for moving a projection device along a path between an extended position and a retracted position, the modular projector lift system comprising:

a motorized drive assembly expandable along a first axis, the drive assembly including a telescoping drive shaft oriented parallel to the first axis;

a pair of movable supports mechanically coupled to the drive shaft for moving the projection device between the extended position and the retracted position, each of the movable supports having an adjustable separation along the first axis relative to the drive assembly; and

a brake mechanism for maintaining a position of at least one of the pair of movable supports relative to the drive assembly, the brake mechanism comprising a plurality of rotating brake plates connected to the drive shaft and a plurality of static brake plates connected to the drive assembly compressively engaged with the rotating brake plates.

21. The system of claim 20 wherein the path is vertical.

22. The system of claim 20 wherein the retracted position is vertically off-set from the extended position.

23. The system of claim 20 wherein the path is horizontal.

24. A modular projector lift system for moving a projection device along a path between an extended position and a retracted position, the modular projector lift system comprising:

a motorized drive assembly expandable along a first axis;

adjustable limit switches for adjusting a location of the retracted and the extended positions along the path; and

a pair of movable supports operatively coupled to the drive assembly and movable along a second axis which is generally perpendicular to said first axis for moving the projection device between the extended position and the retracted position, each of the movable supports having an adjustable separation relative to the other along the first axis and being movable to the drive assembly along the second axis; and

a brake mechanism adapted to maintain a position of at least one of said pair of movable supports relative to the drive assembly.