| 摘要 |
A safety mechanism for a mine car coupling which includes a draw pin, a pin guide connected to a first mine car with an essentially vertical opening therein for receiving the draw pin, a space beneath the pin guide for receiving a link connected to a second mine car, the link having an opening therein for receiving the draw pin. The draw pin includes an upper shoulder which will engage an upper surface of the pin guide and hold the draw pin in its lower position for insertion through the link opening to couple the cars together. The safety mechanism includes a first interposer pivotally connected to the first car at a point below the upper shoulder of the draw pin and projecting above the upper shoulder a predetermined, distance when the pin is in its lower position. There is a device for urging the first interposer toward the upper shoulder so that when the draw pin is in its lower position the first interposer will engage an outer surface of the upper shoulder, and when the draw pin is raised the first interposer will engage an undersurface of the shoulder for preventing the pin from moving toward its lowered position. A second interposer is connected to the first mine car and movable between inner and outer positions and there is a device for urging the second interposer toward the outer position. The second interposer includes a first arm positioned to engage the link connected to the second mine car when the link is in position to receive the draw pin for retaining the second interposer in the inner position, the second interposer being moved toward the outer position by an urging device when the link disengages from the first arm.
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