Mechanical wireline borehole packer

Abstract From the Canadian patent

A wireline supported mechanically operable packer device for use in a drill string casing and attached core drill bit raised off the bottom of a borehole and testing the formation below has a housing adapted to engage an arresting internal shoulder of the core drill bit. A hollow inner mandrel slideable in the housing has attached thereto a packer seal cup an O-ring seal expanded weight means and wireline means moveable between stops determining the extended and contracted positions thereof relative to the housing. Upon lowering the wireline and weight means that attached inner mandrel continues its downward movement relative to the arrested housing and toward the contracted locked sealing …