Hinged bridging plug for explosive placement holes

Details Hinged bridging plug for explosive placement holes Hinged bridging plug for explosive placement holes

1977-04-13

1979-01-02

Brown, David H.

Ammunition and explosives

Igniting devices and systems

102 218, 166192, F42B 320

Patent

active

041321723

ABSTRACT:
A bridging plug for a circular blast hole has a relatively longer major axis and a relatively shorter minor axis. The plug is hinged to pivot about the minor axis. A tension line is secured to the minor axis for lowering the plug into an explosive placement hole. The plug pivots into an angular open position when lowered into the hole. An upward force on the tension line jams the hinged portions of the plug in a closed position to plug the hole. An explosive charge can be placed in the hole at the location defined by the closed plug.

REFERENCES:
patent: 615321 (1898-12-01), Straub et al.
patent: 1979802 (1934-11-01), Kinley
patent: 2047774 (1936-07-01), Greene
patent: 2053448 (1936-09-01), Starr
patent: 2710065 (1955-06-01), Hamilton
patent: 2808890 (1957-10-01), Clark et al.
patent: 3756316 (1973-09-01), Van Ruth

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