|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||425/392 ; 264/296 ; 425/403 ; 425/457|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 15 인용 특허 : 0|
A device for forming a tube of plastic material with a socket having an annular corrugation has a tube supporting core and a plurality of radially movable segments provided adjacently with contacting wedge surfaces, the segments in outwardly shifted position defining a circumferentially beaded portion for forming the annular corrugation on the supported tube.
A device for forming sockets with annular corrugations or recesses on tubes of plastic material comprising a core having a longitudinal axis and a peripheral surface over which a tube to be formed is fitted, a plurality of segments circumferentially arranged around the core at said surface and including a first set wherein the segments end oppositely in outwardly converging wedge surfaces and a second set wherein the segments end oppositely in outwardly diverging wedge surfaces, the segments of said first and second sets being alternately arranged with a...