Abstract: The isokinetic analysis of the forces upon the human muscles of the forearm, wrist and hand from the forces encountered by the tasks of support and stabilization are reduced by the inclusion of sections along the rail in the direction(s) of said task forces, in sufficient length and shape to engage repeated gripping. The human user can impart less force to prevent slipping and loss of control with less strain of muscles required for gripping. Non-obvious embodiments include portable devices such as ladders, boats and bus hand rails.

Abstract: The isokinetic result of forces upon the human muscles of the forearm, wrist and hand from the forces encountered by the tasks of thrust, draw and twist during applying coating materials to substrates (commonly called “painting”) are reduced by the inclusion of sections of the embodiment, tapered to oppose the direction(s) of said task forces, in sufficient length and shape to engage both hands to eliminate repeated gripping strains on the muscles of each hand, wrist and forearm. Non-obvious embodiments include a plurality of tapering shapes formed into the shafts of the brush tool to prevent slipping and loss of control with less strain of muscles required for gripping with two-hand paint brushes. Non-obvious embodiments include a plurality of tapering shapes formed into the shafts of the brush tool to prevent slipping and loss of control with less strain of muscles required for gripping with one-hand brushes.

Abstract: A paintbrush having an elongated handle has a brush head containing a continuum of bristles configured from a multiplicity of primary short bristles and secondary longer bristles with split and smaller diameter distal extremities. The effect of the primary shorter bristles is to release coating liquid onto the longer bristles during bending. The effect of the distal end of the secondary longer bristles is to function as smoothing of the discharged coating in lieu of physical stroking requiring human muscular strain.