Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bolshevik Instr ZfiledCriticalBolshevik Instr Z
Priority to BG8993989ApriorityCriticalpatent/BG49196A1/en
Publication of BG49196A1publicationCriticalpatent/BG49196A1/en
Details Of Spanners, Wrenches, And Screw Drivers And Accessories
(AREA)
Abstract
The screwdriver is used in general machine building. The front working part is designed so that it may be used for screws of various types of jacks by ensuring tight contact from all sides between the screwdriver and the walls of the screw's jack. The screwdriver consists of a handle (1) and a stem (2), the front working part is devised as a equilateral triangular cut pyramid, the small base of which is directed to the front edge of the screwdriver.