发明人：EDWARD F. SCHOONMAKER 申请号：US3690075D
申请日：19711220
公开号：US3690075A
公开日：
19720912
专利内容由知识产权出版社提供
摘要：Disclosed is a new drum holder adapted to receive upon its peripheral cylindrical surface a snug wrapping of a removable sheet material and adapted to substantially continually take up slack as generated in the wrapping during rotation of the holder in use applications. The holder comprises a drum rotatable about its axis, with axially-parallel elements as part of the drum. Those elements include a tightening key chamber, tightening key, and a passage from the key chamber to a slit in the periphery of the drum. The slit is radially advanced with respect to the key chamber during rotation of the drum in use applications. The key holds the trailing end of a sheet wrapped about the drum. The leading end of the sheet is held by pinching action between the key and a radially outward wall of the key chamber. A centrifugal weight on an arm off the key member serves to torque the key itself in a rotary direction opposite to that of the drum rotation in use applications; and this serves in turn to take up slack in the sheet wrapping and also contributes to the holding action on the leading and trailing portions of the sheet wrapping.
申请人：EDWARD F. SCHOONMAKER
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