Abstract: A motor mount having a slidable carriage bodily invertable by rotating 180.degree. on its longitudinal center line, and having stud-receiving portal openings so arranged and situated in the carriage upper and lower cross-members or surface plates such that with studs therethrough securing the motor to the carriage with the carriage in a certain face upward position, the motor is in an attitude necessarily twisted only to, for instance, the left, and is twisted only to the right with the carriage in a position inverted from the mentioned certain position, the studs utilizing the same portal openings in each of the two positions of the carriage.

Abstract: A motor mount having novel means for maintaining the belt from the motor to the driven instrumentality in constant undeviated alinement notwithstanding that a variable pitch pulley is used, of which one flange is axially slidable and the other flange is nonslidable, but wherewith relative lateral displacement between the pulley flanges and belt is compensated for simultaneously with the varying of the pitch diameter of engagement of the belt with said flanges.