Projector lift system

• US 5,551,658 A
• Filed: 08/15/1994
• Issued: 09/03/1996
• Est. Priority Date: 08/15/1994
• Status: Expired due to Term

• Current Assignee: Legrand AV Inc. (Legrand SA)
• Original Assignee: Chief Manufacturing Incorporated (Legrand SA)
• Inventors: Dittmer, Jay S.
• Primary Examiner(s): Chin-Shue, Alvin C.
• Assistant Examiner(s): Purol, Sarah L.
• Application Number:
  US08/290,689
• Time in Patent Office: 750 Days
• Field of Search: 248/329, 248/324, 248/330.1, 352/242, 352/243, 254/362
• US Class Current: 248/329
• 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 11/2064 for tilting and panning F16M11/2078 takes precedence
• CPC Class Codes: F16M 13/027 Ceiling supports
• CPC Class Codes: G03B 21/00 Projectors or projection-type viewers; Accessories therefor devices for changing pictures G03B23/00
• CPC Class Codes: G03B 21/145 Housing details, e.g. position adjustments thereof
• CPC Class Codes: H04N 9/3141 Constructional details thereof details not peculiar to the presence of an electronic spatial light modulator G03B21/14

Abstract

A ceiling mounted projector lift system for moving audio/visual equipment between a lowered position and an operating position secured to projector lift.

Claims

1. A ceiling mounted projector lift system for moving audio/visual equipment between an operating position fixed rigidly to the ceiling and a lowered position, comprising:

a housing rigidly suspended below the ceiling;

a motorized winch assembly mounted in the housing for winding and unwinding a cable;

an equipment mounting member connected to the cable, the mounting member adapted to connect to the audio/visual equipment; and

a releasable fastener for rigidly connecting the housing to the equipment mounting member so that the audio/visual equipment is rigidly retainable by the releasable fasteners when in the operating position.

2. The apparatus of claim 1 further including switch means for interrupting power to the motorized winch assembly when the audio/visual equipment is retained in the operating position by the releasable fastener.

3. The apparatus of claim 1 wherein the housing further includes a ceiling pole mount assembly for receiving a threaded pipe attached to the ceiling.

4. The apparatus of claim 1 wherein the housing further includes position adjustment means for adjusting the yaw of the audio/visual equipment relative to the ceiling.

5. The apparatus of claim 1 wherein the housing further includes position adjustment means for adjusting the roll of the audio/visual equipment relative to the ceiling.

6. The apparatus of claim 1 wherein the housing further includes position adjustment means for adjusting the pitch of the audio/visual equipment relative to the ceiling.

7. The apparatus of claim 1 wherein the motorized winch assembly further includes:

an electric motor engaged with at least one cable cylinder; and

a pinch roller engaged with the at least one cable cylinder, the pinch roller being driven by the electric motor during unwinding of the cable.

8. The apparatus of claim 7 wherein the pinch roller is disposed at an angle relative to the cable cylinder so that the pinch roller maintains pressure on a leading edge of the cable winding.

9. The apparatus of claim 1 wherein the motorized winch assembly further includes a cable guide assembly for uniformly winding and unwinding the cable on the at least one cable cylinder.

10. The apparatus of claim 9 wherein the cable guide assembly is synchronized with the electric motor.

11. The apparatus of claim 1 wherein the motorized winch assembly comprises:

a first electric motor engaged with a first cable cylinder; and

a second electric motor engaged with a second cable cylinder, whereby each electric motor has a capacity sufficient to move the audio/visual equipment between the operating position secured to the ceiling and the lowered position.

12. The apparatus of claim 11 wherein the motorized winch assembly comprises:

first and second pinch rollers engaged with the first and second cable cylinders, the pinch rollers being driven by the first and second electric motors, respectively, during unwinding of the cable; and

first and second cable guide assemblies for uniformly winding and unwinding the cable on the first and second cable cylinders.

13. The apparatus of claim 11 wherein the first and second electric motors are synchronized.

14. The apparatus of claim 1 wherein the motorized winch assembly further includes a limit switch for signaling when the unwinding of the cable is complete.

15. The apparatus of claim 7 wherein the electric motor includes an internal brake for preventing motor rotation when electric power is terminated.

16. The apparatus of claim 15 wherein the motorized winch assembly includes an external brake assembly for augmenting the internal brake in the electric motor.

17. The apparatus of claim 1 wherein the equipment mounting member registers the audio/visual equipment to the housing when the releasable fastener is engaged.

18. A ceiling mounted projector lift system for moving audio/visual equipment between an operating position secured to projector lift and a lowered position comprising:

a housing attached to the ceiling;

a motorized winch assembly retained in the housing having at least one cable cylinder for winding and unwinding a cable disposed on the cylinder, the distal end of the cable being connected to the audio/visual equipment;

a locking latch assembly for releasably connecting the housing to the audio/visual equipment so that the equipment is rigidly retained in the operating position; and

switch means for interrupting power to the motorized winch assembly when the equipment is retained in the operating position by the locking latch assembly.

19. A ceiling mounted projector lift system for moving audio/visual equipment between an operating position secured to the projector lift and a lowered position comprising:

a housing suspended below the ceiling proximate the operating position;

a motorized winch assembly retained in the housing having at least one cable cylinder for winding and unwinding a cable disposed on the cylinder, the distal end of the cable being connected to the audio/visual equipment;

position adjustment means for adjusting the position of the housing relative to the ceiling; and

a locking latch assembly for releasably connecting the housing to the audio/visual equipment so that the audio/visual equipment is rigidly retainable by the releasable fasteners in the operating position.

20. A ceiling mounted projector lift system for moving audio/visual equipment between an operating position fixed rigidly to the ceiling and a lowered position, comprising:

a housing rigidly suspended below the ceiling;

a motorized winch assembly mounted in the housing an electric motor engaged with at least one cable cylinder for winding and unwinding a cable;

first capacitor means having a first capacitance connected to the electric motor for unwinding the cable on the at least one cable cylinder;

second capacitor means having a second capacitance connected to the electric motor in combination with the first capacitor means for winding the cable onto the at least one cable cylinder;

an equipment mounting member connected to the cable, the mounting member adapted to connect to the audio/visual equipment; and

a releasable fastener for rigidly connecting the housing to the equipment mounting member so that the equipment is rigidly retained in the operating position.

21. A method for moving audio/visual equipment between a lowered position and an operating position secured to projector lift proximate the ceiling of a room comprising the steps of:

providing a housing containing a motorized winch assembly attached to the ceiling, the winch assembly having at least one cable cylinder for winding and unwinding a cable disposed on the cylinder;

attaching an equipment mounting adaptor to the distal end of the cable;

attaching the audio/visual equipment to the mounting adaptor;

raising the audio/visual equipment to the housing using the winch assembly;

rigidly latching the mounting adaptor to the housing so that the equipment is retained in the operating position; and

engaging switch means for interrupting power to the motorized winch assembly when the equipment is retained in the operating position.

22. The method of claim 21 further including the steps of:

disengaging the mounting adaptor from the housing; and

lowering the mounting adaptor and audio/visual equipment using the winch assembly.