Blanket bar and adapter bar assembly for printing blanket

Claim 1

In an assembly for attaching a printing blanket on a press cylinder of an offset printing press, comprising an elongated adapter bar formed for attachment within a recessed portion of a press cylinder and provided with a base having a channel extending from end to end and having a bottom wall with its forward edge defined by an upstanding abutment shoulder and its rearward edge defined by an upstanding wall which continues into a forwardly extending lip portion with its under surface spaced from the bottom wall to form a U-shaped portion of the channel, an elongated blanket bar having portions secured to opposite sides of a free end portion of a printing blanket and adapted to be detachably mounted in the adapter bar to position the blanket on the press cylinder, the inner surface of said abutment shoulder on the adapter bar being engageable by the inner edge of the underside portion of the blanket bar, the improvement comprising means carried on the adapter bar for coacting with the outer edge of said blanket bar for wedging the inner end of the underside side portion of the blanket bar against said abutment shoulder and positively locking the blanket bar to the adapter bar, said means comprising a threaded type headed fastener threaded through said lip of the adapter bar and adapted to extend, in one position of adjustment, across said U-shaped portion of the channel of the adapter bar into wedging engagement with the outer edge of the blanket bar, said fastener having a portion of its shank cut away for a length at least equal to the space between the underside of the lip and the bottom wall of the channel, providing a flat face, which in another position of adjustment of the fastener disposed substantially flush with the inner surface of the closed end of said U-shaped portion of the channel.