UNIVERSAL SCREWDRIVER Russian patent published in 2011 - IPC B25B15/00 B25B23/12 

FIELD: process engineering.

SUBSTANCE: invention relates to hand-held tools. Screwdriver comprises handle with case and changeable tips. Screwdriver base is made up of plate with annular groove made on bottom surface. Spring-loaded screw rod is provided with magnetic head furnished with cutout made at its bottom, and two tenons. Screwdriver drum has shaft and bottom hole, and may revolve. Drum axle is secured on base bottom, while handle case is secured on base top surface. Spring-loaded rod may vertically move inside said drum and handle case. Handle case has two vertical cutouts and two horizontal cutouts. Changeable tips are made from ferromagnetic metal and arranged in the drum. Each tip comprises blade, head with guide ledge and stop limiting extension of the tip from drum bottom. Tip guide ledges may move in base annular groove to enter the spring-loaded rod magnetic head cutout. Base, handle with case, spring-loaded rod and drum are made from nonmagnetic materials.

EFFECT: ease of use.

7 cl, 2 dwg