| 摘要 |
An improved pre-closed slide mount is described having two sides or masks which are secured together for defining an internal pocket to retain a film transparency which is inserted edgewise through an opening or entranceway in one edge of the mount and defining a window for viewing the transparency in the mount. An elevated border region formed in one mask of the mount extends transversely across the entranceway and has a sloping outer surface to provide a funnel for directing a transparency into the entranceway, and this border region has laterally sloping ends which define two spaced valleys for receiving the outer edges of a longitudinally bowed film strip serving as pusher for the inserted transparency. The outer edges of the valleys are defined by lateral transparency guides. The border region of the other mask forms an elevated roof over the elevated border region with inverted steps over the laterally sloping end portions of the border region. A transparency funneled between the elevated border region and the roof slides between the inverted steps and the elevated border region thereby moves into the entranceway. A deflecting surface behind the elevated roof deflects a transparency downwardly into the transparency pocket behind the elevated border region, and the border region then retains the transparency within the pocket. Clamping ribs are provided adjacent the window to grip the transparency within the pocket. A retraction clearance slot may be provided adjacent one of the valleys to provide clearance for the transparency pusher as it is being retracted while lateral movement of the slide mount commences; thus, the slide mount may begin moving laterally away from its loading station even though the bowed film strip pusher has not yet been fully retracted out of the entranceway. The two masks are formed as two sides of a plastic blank hinged at the center of a thin flexible region of plastic and spaced alignment ridges. The two sides may be folded and ultrasonically welded together to form a pre-closed slide mount. Isolation grooves prevent flash of plastic material into the transparency pocket during the welding process.
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