发明授权
- 专利标题: Portable riser
- 专利标题(中): 便携式冒口
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申请号: US54691申请日: 1998-04-03
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公开(公告)号: US5901505A公开(公告)日: 1999-05-11
- 发明人: Thomas A. Dettmann , Mark E. Gallea , David R. Boeddeker , Leslie R. Abraham
- 申请人: Thomas A. Dettmann , Mark E. Gallea , David R. Boeddeker , Leslie R. Abraham
- 申请人地址: MN Owatonna
- 专利权人: Wenger Corporation
- 当前专利权人: Wenger Corporation
- 当前专利权人地址: MN Owatonna
- 主分类号: E04H3/12
- IPC分类号: E04H3/12 ; E04H3/28
摘要:
The choral riser of the present invention is adapted to be supported on a stage surface. The choral riser has a base that presents two spaced apart base supports, each of the base support having a first and a second spaced apart pivot point. A first step member has a step pivot point and a base pivot point that is operably pivotally coupled at the base pivot point to the base at the base first pivot point and has at least one step presented thereon. A second step member has a step pivot point and a link pivot point that is operably pivotally coupled at the step pivot point to the first step member at the first step member step pivot point and has a plurality of steps presented thereon. A bar link member is operably pivotally coupled at a first end pivot point to the second step member bar link pivot point. The bar link member is operably pivotally coupled at a second end pivot point to the base second pivot point. The first and second step members are pivotable between a stowed configuration, with at least one of the steps of the first step member facing at least one of the steps of the second step member, and an operational configuration in which the steps of the first and second step members present an ascending succession of steps. The steps are readily reversible to change the stage presentation form.
公开/授权文献
- USD383276S Apparel dryer 公开/授权日:1997-09-02
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