| 摘要 |
A unitary injection-molded plastic holder frame for displaying an advertising placard or the like has four frame sides connected at their ends into a rectangle, a contiguous trio of the sides having generally coplanar mutually directed shallow channels therein for receiving the side margins along three sides of the placard with the remaining frame side being slotted along its length to separate that side into two parallel frame strip. The slot is in coplanar relation to said shallow channels and communicates at its ends with the corresponding ends of the channels in two opposite frame sides whereby the placard can be inserted via the slot into the frame with the margins of its three sides protruding into said channels. Detent means is provided for positively retaining said placard in its inserted position within said frame, in the form at least one nib carried on an inner face of at least one of the frame strips projecting toward the opposite strip substantially into contact with the inner face of said opposite strip face and preventing the accidental passage of said placard through said slot. Preferably, each nib has an inclined edge extending from a point adjacent the inner side of the frame strip to a point adjacent its outer side and sloping in the direction from the inner to the outer side toward the opposite frame strip, the inclined edge facilitating the intentional passage of the placard past the nibs for removal from the frame.
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