发明授权
- 专利标题： Structural ridge member for vibrating concrete screeds
- 专利标题（中）： 用于振动混凝土砂浆的结构脊构件
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申请号： US251115申请日： 1981-04-06
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公开(公告)号： US4349295A公开(公告)日： 1982-09-14
- 发明人: Donald R. Morrison
- 申请人： Donald R. Morrison
- 专利权人： Morrison Donald R
- 当前专利权人： Morrison Donald R
- 主分类号： B28B1/093
- IPC分类号： B28B1/093 ; B28B1/29 ; E01C19/40 ; E04G21/10
摘要：
An improved frame construction for a portable, vibrating-type concrete screed incorporates a specially designed hollow ridge tube extending along the apex of an elongated open frame of triangular cross section and providing means for adjusting relative angular positions of adjoining screed units and for passage of air when the screed is air operated.
公开/授权文献
- US5437377A Tree attachable arrow holder 公开/授权日：1995-08-01
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