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BUILDING DRUM

  • US 3,779,835 A
  • Filed: 06/03/1971
  • Issued: 12/18/1973
  • Est. Priority Date: 06/03/1971
  • Status: Expired due to Term
First Claim
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2. A building drum for a laminate structure comprising a series of alternating long and short peripheral segments for mounting around a rotary power shaft of a building machine and which interfit when expanded to provide a continuous, concentric and dimensionally precise building surface and are collapsed to reduce the drum diameter for removal of the laminate structure, said drum having a hub for mounting on said shaft, each segment being slidably mounted for radial movement relative to the rotational axis of said shaft on guide posts projecting outwardly from the mounting hub and having actuator flanges projecting inwardly toward said hub, characterized in that, said hub is rotated by said power shaft through a drive means and said hub is connected to a brake means to at least momentarily arrest rotation of the hub with the shaft, said drive means permitting a limited relative motion of the shaft to the hub, said hub coaxially carrying radially directed plate means having a plurality of skewed curvilinear cam channels thereon, said cam channels beginning at a point near to the rotational axis of the power shaft and continuing outwardly to terminate near the outer edge of a plate means, the cam channels guiding said short segments having a lesser degree of curvature relative to the rotational axis of the power shaft than the cam channels guiding movement of long segments, there being cam follower means carried by each actuator flange and engaged within each cam channel, whereby, upon said relative motion of the power shaft and the hub the segments will expand and collapse.

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