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 […]
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. […]
Innovative strap on Whizard® knife (see comments below) Principles affected Fatigue Background Constantly holding a hand tool can fatigue muscles (“static grip”), cause pain, and interfere […]