Abstract: A cart for carrying a cylinder containing a liquid or gas is disclosed, the cylinder having an anchor location, the cart including a frame including a body and a handle, wheels coupled to the frame for carrying the frame and the cylinder, a hook capable of engaging the anchor location of the cylinder to capture and retain the cylinder on the frame, an automatic actuator configured to move the hook into and out of engagement with the anchor location, and first and second safety switches that are configured to be engaged respectively by left and right hands of a user, the safety switches disabling the actuator if not engaged by both hands of the user.

Abstract: A gear drive assembly includes an elongated housing with a cavity and a pair of opposed apertures in communication with the cavity. At least one output shaft extends through the apertures. A drive gear is positioned in the cavity and fixedly connected to the at least one output shaft for rotation therewith. The drive gear and the output shaft have a predefined range of travel in a direction of the longitudinal axis to facilitate assembly of the gear drive assembly. A spacer is located within the cavity between the housing and the drive gear and is configured to preclude movement of the drive gear and the output shaft through the predefined range of travel after assembly. A drive motor can be mounted on the housing for transferring power to the at least one output shaft.