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95:, forming the wall of the column, while at the same time, the horizontal band interlocks the continuous spiral seam of the vertical band. When the column lowers, the bands separate and retract into two compact coils. The bands are combined, separated and stored by an assembly located at the base of the column. The result is an efficient (50%-80%) telescoping lifting column.
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The piston rods of a hydraulic lift extend below the platform they support by more than the length that the lift travels. For lifts at grade, housings for the rods are often sunk into support holes, known as caissons, that are inaccessible and often complicated by groundwater levels. If placed
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Another significant issue with hydraulic lifts is platform drift, the tendency of a platform to lower due to depressurization of the hydraulic system over time. Helical band actuators do not suffer from platform drift because they are rigid mechanical devices.
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above ground, the space occupied by the rod housings is unusable. Gagnon's actuator eliminates caissons and reduces the volume of unusable space below the platform of the lift.
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The telescoping column is formed by a pair of interlocking stainless steel bands. One band has a vertical rectangular profile and the other horizontal, much like an oversized
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106:. Helical band actuators require a separate lateral support mechanism, usually provided in the form of guide rails or self-guiding frame, such as a
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To incorporate the device into a lift system, multiple helical band actuators are arranged below the lift platform where they are powered by an
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lifts. The actuator forms a high-capacity telescoping tubular column (lifting capacities to 25,000 pounds, travel to 40 feet).
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Pierre Gagnon was awarded a US patent for the “Push
Actuator” in 1989. Gagnon developed the actuator to substitute
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can also be effective at addressing these issues with hydraulic jacks, and are also used for stage lifts.
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were the predominant push actuators used in performing arts facilities, but they had their issues.
191:, Gagnon, Pierre & LaForest, Pierre, "Push actuator", published 1989-10-24
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132: – spindle consisting of discrete elements that can be assembled and disassembled on the fly
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147: – German computer scientist and engineer (1910–1995)
91:. The vertical band spirals up on itself into a stacked
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Patent
Drawing for Spiralift Actuator(1989), with legend.
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Pages displaying short descriptions of redirect targets
126: – Actuator that creates motion in a straight line
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Pages displaying wikidata descriptions as a fallback
56:in stage and orchestra lift systems. Hydraulic
170:http://www.galainfo.com/pdfs/spiralift3_eng.pdf
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28:, generally known by the trademark
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141: – Vertical transport device
216:Video - Spiralift: How It Works
32:, is a complex and specialized
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168:Spiralift Specifications:
211:I-Lock Spiralift Brochure
83:Principle of operation
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102:(s) and synchronized
77:rigid chain actuators
26:helical band actuator
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54:hydraulic cylinders
175:2011-07-11 at the
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130:Segmented spindle
42:material handling
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151:(by Konrad Zuse)
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177:Wayback Machine
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34:linear actuator
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48:Raison d'être
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104:transmission
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139:Stage lifts
73:screw jacks
38:stage lifts
189:US 4875660
156:References
108:pantograph
231:Actuators
145:Helixturm
30:Spiralift
225:Category
173:Archived
118:See also
110:(e.g. a
36:used in
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89:Slinky
93:helix
58:jacks
75:and
40:and
114:).
227::
24:A
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