Background Old sewing machine Manipulator using potter’s wheel Foot pedals were common in the past as a source of power in various tools and equipment. Sewing […]

Background Manhandling barrel to empty liquid Pumps should be considered whenever liquids are handled in heavy containers. In particular, the availability of inexpensive manual pumps is […]

Background Mechanism Ratchet wrench Ratchets are commonly incorporated into tools to increase efficiency and ease of use. The mechanism reduces motions by eliminating the need to […]

Background Power steering The terms “power assist” and “mechanical assist” are used loosely in general industry, but generally refers to any device that actively aids the […]

Background Without hinge: Difficult With hinge: Easy Hinges are often overlooked as a simple way to improve efficiency and physical demands on people. They should be […]

Screw clamp: Slow, forceful Quick release: Fast, easy Principles affected Force Motions Related pages Access panels Fixtures Background Quick releases and disconnects have multiple advantages over […]

Background Speed Strength The gear is an ancient mechanism that continues to have new uses.  Gears can be used either to increase speed (thereby reducing motions) or […]

  Lever added to wire stripper (see lever devices below) Principles affected Force Background Levers are as old as the earliest humans.  Yet, they still can play a […]

Forearm brace provides heavy force with no wrist strain Principles affected Force Background Certain types of tools and tasks can place considerable strain on the wrist. […]