Abstract: An operator's cab for a shuttle car including a cab frame, a window assembly, and a pressurization system. The cab frame defines an interior chamber and an opening. The window assembly includes a pane and a pane seal. The pane is coupled to the cab frame such that the pane covers the opening and encloses the interior chamber. The pane seal is positioned between the pane and the cab frame. The pressurization system provides a positive pressure in the interior chamber relative to the surrounding environment. The pressurization system includes a blower and a motor for driving the blower. The blower is in fluid communication with the interior chamber.

Abstract: A movable machine includes a frame, an electrical motor on the fame, a cable electrically connected to the motor and adapted to be connected to a source of power, and a sheave bracket assembly coupled to the frame. The sheave bracket assembly includes two mounting plates, two spaced apart sheaves rotatably mounted on the mounting plates, a hinged portion coupled to the mounting plates and pivotally coupled to the frame, and at least one biasing member located between the frame and the mounting plates that biases the mounting plates and sheaves toward a first position.

Abstract: An operator's cab for a shuttle car including a cab frame, a window assembly, and a pressurization system. The cab frame defines an interior chamber and an opening. The window assembly includes a pane and a pane seal. The pane is coupled to the cab frame such that the pane covers the opening and encloses the interior chamber. The pane seal is positioned between the pane and the cab frame. The pressurization system provides a positive pressure in the interior chamber relative to the surrounding environment. The pressurization system includes a blower and a motor for driving the blower. The blower is in fluid communication with the interior chamber.

Abstract: A compact seat suspension for an underground mining machine is disclosed in which a vertical suspension is operably connected between a fixed bracket and a sliding bracket for supporting a seat and for reducing and dampening vibration and shock transmitted from the mining machine to the seat. The fixed bracket is attached to a side wall of the mining machine and includes one or more vertical guide members. The sliding bracket is movably mounted on the vertical guide members for relative vertical movement with respect to the fixed bracket. The sliding bracket is attached to the back portion of a seat provided within the mining machine. The entire compact assembly is adapted to be positioned entirely behind rather than beneath the seat, making it possible to utilize the suspension in areas of reduced height.

Abstract: A cable tension control device for an electrically powered mine vehicle is disclosed. The vehicle is of the type having an electric trailing cable wound on a cable reel mounted on the vehicle. The cable reel has a motor for rotating the reel in the direction for taking up the cable as the vehicle moves toward a power source and for preventing freespooling of the reel as said cable is unwound as the vehicle moves away from the power source. The device includes a sensor for measuring the amount of electric cable on the reel and utilizes this sensed amount of cable for controlling the drive torque of the motor in direct proportion to the amount of cable sensed on the reel. The same sensed amount of cable is used to control the braking torque developed by the motor when the motor is being driven by the reel as when cable is being pulled off during movement of the vehicle away from the power source.