Method of folding annular band

Details Method of folding annular band Method of folding annular band

1982-08-23

1984-11-13

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156201, 156204, 156215, 156218, 156222, 156226, 156420, 1564214, 264315, B29H 1700

Patent

active

044824165

ABSTRACT:
For folding an annular resilient band about a circumferential fold line, the band is first wrapped on a generally cylindrical, radially collapsible drum structure having a cylindrical external contour about the center axis of the drum and an annular zone radially inward of the contour with an inflatable annular first bladder positioned in such a manner as to have a folded-over axial end portion axially protruding into the aforesaid annular zone and with an inflatable annular second bladder positioned radially inwardly of the first bladder and in such a manner that the first and second bladders have axial portions overlapping each other, whereupon the first bladder is inflated to a medium expanded state so that an axial end portion of the band on the drum structure is contacted by the bladder and displaced radially outwardly and thereafter the first bladder is moved axially away from the drum structure for forming an annular gap between the first bladder and the axial end portion of the band, the second bladder being thereafter inflated to a fully expanded state for deforming the first bladder axially between the band and the second bladder so that the axial end portion of the band is caused to further turn about the aforesaid fold line until the axial end portion of the band is received on an adjacent axial portion of the band.

REFERENCES:
patent: 3154455 (1964-10-01), Nebout
patent: 3160545 (1964-12-01), Burton
patent: 3438832 (1969-04-01), Cantarutti
patent: 3525655 (1970-08-01), Wood et al.
patent: 3647598 (1972-03-01), Gazuit
patent: 3740293 (1973-06-01), Jones et al.
patent: 3784437 (1974-01-01), Appleby et al.
patent: 4063987 (1977-12-01), Irie et al.
patent: 4087306 (1978-05-01), Head et al.

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