Handle for a tool

#There are numerous different handle shapes for screwdrivers or similar tools. The earliest screwdrivers have a circular cross-section and an approximately convex longitudinal section. Apart from the circular cross-section, cross-sections are known, which are based on a subdivision into two or three. These include cross-sections in the form of a flattened circle and also triangular and hexagonal cross-sections. Polygonal cross-sections have been chosen to improve torque transmission.

#A handle for hand tools is already known (DE 9202672), which has a pentagonal cross-section. The edges of the pentagonal cross-section are rounded and the arc length of the rounded part of the cross-section is everywhere substantially the same.

#The problem of the invention is to provide an ergonomically improved handle for a screwdriver or similar tool with which it is also possible to transmit a torque. Tools of this type are e.g. screw clamps, where for clamping purposes a screwing movement must also be performed, together with ripping chisels, files, hacksaws,.etc., in which e.g. a twisting must be prevented, which means that a torque must also be applied, namely to prevent twisting.

#Further features, details and advantages of the invention can be gathered from the following description of a preferred embodiment of the invention, as well as the attached drawings, wherein show:

#FIG. 1 perspectively shows a tool handle according to the invention, such as can e.g. be used for a screwdriver. The screwdriver shank is not shown. However, the handle can also be used for clamping screw clamps, as well as a handle for hacksaws, ripping chisels or files. In the case of these tools it is a question of either performing a rotary or screwing movement, or of preventing twisting of the tool, which must also be brought about by the application of a torque.

#The tool handle extends from an end face 1, from which would pass out the shank of a screwdriver, and along a longitudinal axis to an opposite, free end 2. In the vicinity of the free end 2 the handle is rounded and consequently forms a dome. when using the tool said dome is applied to the palm or ball of the thumb. Between these two ends the tool handle has a maximum cross-section point, which is represented by the plane VI—VI in FIG. 2. The spacing of said plane from the dome end 2 of the tool handle is approximately 30% of the handle length. The term handle length is understood to mean the distance between the free end and the front end face 1. In the vicinity of said end face 1 the handle has a diameter increase on which a user can support his index finger or thumb. It would also be conceivable, starting from this end face 1, to lengthen the handle, without this influencing the use of the handle during turning or screwing. Such an extension should not be calculated in when calculating the handle length.

#Spaced from the maximum diameter point, the handle has a second maximum cross-section point, represented by plane IV—IV in FIG. 2. Between said two planes there is a point, represented by plane V—V in FIG. 2, where there is a local minimum cross-section.