Systems and methods for converting ordinary circular rotary motion into any non-circular motion that can be defined as a non-overlapping proper function in polar coordinates are provided. Embodiments disclosed teach how to make and use devices that can use the rotary output from motors, turbines and other sources of circular rotary motion to create motion that follows square, rectangular, triangular, or other useful paths. Such devices can be usefully employed as a replacement for conventional devices in applications where the desired path or area of coverage is not circular, including air-moving (fans), air-energy capture (turbines), surface finishing (sanding, polishing, cleaning), among many others.

A drive system as disclosed includes an input shaft, an output shaft, and at least two coupling elements respectively coupled to the input shaft and the output shaft. In order to absorb assembly and manufacturing tolerances with respect to the shafts, the coupling elements and their attachment to the shafts and thereby prevent jamming of the drive system, at least one coupling element has an elastically deformable section, the elastically deformable section having a different material or a different cross-section than an adjacent section of the coupling element.

A drive system as disclosed includes an input shaft, an output shaft, and at least two coupling elements respectively coupled to the input shaft and the output shaft. In order to absorb assembly and manufacturing tolerances with respect to the shafts, the coupling elements and their attachment to the shafts and thereby prevent jamming of the drive system, at least one coupling element has an elastically deformable section, the elastically deformable section having a different material or a different cross-section than an adjacent section of the coupling element.

A trailer landing gear deployment device for mechanically raising and lowering a trailer includes a trailer and a landing gear that can be raised and lowered relative to the trailer. A handle is mechanically coupled to the landing gear, which is selectively raised and lowered by rotation of the handle. A disk is rotatably coupled to a housing. An arm is coupled to the disk. The arm is couplable to the handle and rotates the handle when the disk is rotated. A motor is operably coupled to the disk wherein the motor is actuatable to rotate the disk. A power source is electrically coupled to the motor. A control panel is electrically coupled to the power source. The control panel is manipulatable to actuate the motor.

A trailer landing gear deployment device for mechanically raising and lowering a trailer includes a trailer and a landing gear that can be raised and lowered relative to the trailer. A handle is mechanically coupled to the landing gear, which is selectively raised and lowered by rotation of the handle. A disk is rotatably coupled to a housing. An arm is coupled to the disk. The arm is couplable to the handle and rotates the handle when the disk is rotated. A motor is operably coupled to the disk wherein the motor is actuatable to rotate the disk. A power source is electrically coupled to the motor. A control panel is electrically coupled to the power source. The control panel is manipulatable to actuate the motor.

A system (100) for leveraging force comprises a main crosspiece (2) having at least one first end (2a) and an opposite at least one second end (2b) end. The main crosspiece (2) is interconnected by means of an axle (5) with a static wheel (1) at a location (2c), in between the first end (2a) and second end (2b) of the main crosspiece (2), the static wheel (1) is characterized by a first diameter (D). The second end (2b) of the crosspiece (2) is configured to provide an output force F.sub.out at second end (2b) correlated to (L/l)F.sub.in, where F.sub.in is an input force applied to the driving wheel (4), L is a distance between second end (2b) and the main axle (5) and Lis a distance between the first end (2a) and the main axle (5).