US Patent No: 4,324,386

Number of patents in Portfolio can not be more than 2000

Battens system for raising and lowering sceneries or similar loads on a stage

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Abstract

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A battens system for raising and lowering sceneries or similar loads on a stage is disclosed. The system comprises a series of support members adapted to be secured to the joists of a ceiling, an elongated winch drum made up of several sections interconnected by universal joints and supported in horizontal position by said support members, each winch drum section being provided over part of its length with a helical groove on which a cable for supporting the load is wound. Each support member carries bearing wheels engaging the helical grooves for rotatably supporting the winch drum and for causing its axial displacement at each turn by a distance equal to the pitch of the cable wound or unwound from the winch drum, such that the load will not be laterally shifted when being raised or lowered. The shaft of a reversible hydraulic motor is secured to an end of the winch drum, whereby the hydraulic motor moves with the winch drum in its axial movement. The housing of the hydraulic motor is provided with a torque arm engaging a stationary guide extending parallel to the winch drum to prevent rotation of the motor housing. The hydraulic motor is controlled by a three-position spool valve, the position of which is controlled by a reversible electric stepping motor. Movement differential between the stepping motor and the winch drum produces progressive closing and opening of the valve which results in smooth acceleration and deceleration of the load during raising or lowering, and an accurate positioning of the load. A brake is preferably provided to stop the winch drum when the hydraulic motor is not supplied with fluid under pressure.

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Patent Owner(s)

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International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gagnon, Pierre Montreal, CA 27 130
Laforest, Pierre Montreal, CA 26 144

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
4,199,133 Battens system for raising and lowering sceneries on a stage 10 1978

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
DAKTRONICS HOIST, INC. (10)
6,988,716 Modular lift assembly 17 2002
6,889,958 Brake for hoist assembly 28 2003
6,997,442 Safety sensor for a lift assembly 16 2004
7,258,325 Modular lift assembly 2 2006
7,484,715 Modular lift assembly having telescoping member 1 2006
7,293,762 Modular lift assembly 3 2006
7,854,423 Modular lift assembly 3 2008
7,810,792 Modular lift assembly having telescoping member 0 2008
8,047,507 Modular lift assembly 2 2010
8,286,946 Modular lift assembly 1 2011
 
J.R. CLANCY, INC. (2)
8,002,243 Configurable winch 1 2008
7,766,308 Theater rigging system 6 2009
 
PRODUCTION RESOURCE GROUP, L.L.C. (2)
6,385,493 Computer controlled winch assembly for stage 8 2000
6,547,670 Stage element movement assembly 3 2002
 
Aalco Manufacturing Company (1)
7,297,076 Method and apparatus for retractable enclosure 0 2003
 
BEO BRACKMAN ELECTRONICS & OPTICS B.V. (1)
6,729,605 Cable winch hoisting device for stages 5 2002
 
EASOM AUTOMATION SYSTEMS, INC. (1)
6,422,536 Lifter apparatus for raising and lowering a part 6 2000
 
INTUITIVE SURGICAL OPERATIONS, INC. (1)
8,151,661 Compact capstan 0 2006
 
OLAF SOOT DESIGN, LLC (1)
6,520,485 Winch system for raising and lowering theatre scenery 27 2000
 
Other [Check patent profile for assignment information] (6)
4,662,628 Device for maneuvering scenery 27 1985
5,254,040 Handball - squash court conversion system 7 1991
7,264,227 Self-climbing stage light support 5 2004
8,636,265 Winch for raising and lowering theater scenery 0 2010
8,596,616 Winch for raising and lowering theatre scenery 0 2011
8,789,814 Modular lift assembly 0 2012

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