Abstract: A pole assembly includes an elongated tubular member having an outer periphery with a pair of grooves therein, each groove defining a concave sidewall portion and a flat sidewall portion, a cam member comprising a plate-shaped portion and a pair of arms extending from a surface of the plate-shaped portion, the cam member configured to, while the major surface is adjacent a portion of the outer periphery, be rotated to cause each arm of the pair of arms to engage a respective groove of the pair of grooves, and a mount portion comprising a body defining a cavity having a pair of elongated sidewalls configured to engage respective outer surfaces of the pair of arms while the mount portion covers the cam member and the cam member is at least partially within the cavity to prevent the pair of arms from disengaging from the pair of grooves.

Abstract: A battery changing system is provided for an electrically powered vehicle. The battery changing system includes a housing for the battery. The housing includes first and second spaced crossbars. A battery manipulating mechanism is mounted to the vehicle. This battery manipulating mechanism includes at least one outwardly projecting arm that is pivotally connected to the vehicle and driven by an actuator so as to raise and lower the battery. More specifically, the arm includes an upwardly directed recess for engaging the first crossbar on the battery housing and a downwardly directed saddle for receiving the second crossbar of the battery housing. A locking plate may be selectively extended to secure the second crossbar in the saddle.

Abstract: A temporary support for a mine roof is mounted on a mobile roof bolter, and includes a main support frame pivotably connected to the bolter, a main support beam and a ground contacting beam, both extending along the same axis in front of the main support frame, and connected to each other and to the main support frame by a scissors pivot joint and a leveling pivot joint, respectively. When the scissors pivot joint opens and closes, the main support beam and ground contact beam raise and lower with respect to each other and with respect to the ground. A cross beam is mounted on the main support beam and transverse to the axis thereof, and raises and lowers in the same plane with respect to the mine face, to contact and support the mine roof. For a high lift version, the scissors pivot joint is telescopically extendable.

Abstract: A temporary support for a mine roof is mounted on a mobile roof bolter, and includes a main support frame pivotably connected to the bolter, a main support beam and a ground contacting beam, both extending along the same axis in front of the main support frame, and connected to each other and to the main support frame by a scissors pivot joint and a leveling pivot joint, respectively. When the scissors pivot joint opens and closes, the main support beam and ground contact beam raise and lower with respect to each other and with respect to the ground. A cross beam is mounted on the main support beam and transverse to the axis thereof, and raises and lowers in the same plane with respect to the mine face, to contact and support the mine roof.