초록 ▼

A hammer-head comprising an optimally designed set of nail extraction claws oriented at a predetermined tangency angle relative to an integrally mounted anvil. The hammer-head is to be used with an integral or removable handle to minimize the forces required in extraction of nails and in exercising

A hammer-head comprising an optimally designed set of nail extraction claws oriented at a predetermined tangency angle relative to an integrally mounted anvil. The hammer-head is to be used with an integral or removable handle to minimize the forces required in extraction of nails and in exercising prying forces by such tools as a common hammer, a crowbar, or a lever with a stationary or movable fulcrum point. An optimization methodology based on minimization of the nail extraction energy or minimization of the nail extraction energy is implemented in a design methodology and an algorithm for the synthesis of the optimal contour shape of the claws. Boundary conditions, constraints, constitutive models, and governing equations for this design methodology are derived from the length of nails and the engagement conditions between the nail, the board, and the hammer, and the outcome facilitates the design of a single optimum claw contour for extraction of a range of nail sizes, or a family of claw contours for the extraction of varying ranges of nails.

대표청구항 ▼

An optimization method for generating and displaying contoured curves comprising the steps of: a) receiving input information in the form of physical requirements, said physical requirements corresponding to dimensions and tangency conditions of common hammers, crowbars, and levers; b) analyzing val

An optimization method for generating and displaying contoured curves comprising the steps of: a) receiving input information in the form of physical requirements, said physical requirements corresponding to dimensions and tangency conditions of common hammers, crowbars, and levers; b) analyzing values of the dimensional requirements and tangency conditions and deriving boundary conditions; c) receiving information on theoretical or experimental constitutive models of nail extraction forces; d) deriving energy minimization governing differential equations, based on constitutive equations and engagement conditions between contoured hammer-claws shaped according to optimal curves, by use of variational calculus or exhaustive search methods; e) solving numerically governing differential equations and applying boundary conditions; and f) listing and graphically displaying curves and providing data points for the design of hammers, crowbars, and levers requiring minimal energy for the application of pulling forces.