Process for extracting security screw for wheels of motor vehicle and extractor for executing the process
AssigneeHubitools S.A.
InventorYannick M Dudot
Life of this patent
Estimating the term…
Abstract
The invention relates to an extractor (1), a process and a set of tools for extracting a safety screw or a broken screw, consisting of inserting an extractor (1) into a hollowed bore (17) in said screw, by inserting the rod (3) of the extractor (1) into said bore (17) and by percussion on the head (7) of said extractor (1) using a percussion tool (49), so as to couple the extractor (1) and the screw (13) in rotation; and extraction of the screw (13) by loosening it using a key suitable for with the head (7) of the extractor.
Claims17
A method of extracting a safety screw or a broken screw, said screw (13) comprising a rod (21) and possibly a head (23), the method comprising the following steps:
- a) drilling a bore (17) longitudinally in the screw (13) using a drill (19) with a diameter less than the diameter of the rod (21) of the screw (13);
- b) fitting an extractor (1) in the said bore (17), the extractor (1) comprising a cogged rod (3) whose cogs are in the form of longitudinal ribs (5) and a head (7) fixed to one of the ends of said rod (3), wherein fitting the extractor includes inserting the rod (3) of the extractor (1) in said bore (17) and by percussion on the head (7) of said extractor (1) by means of a percussion tool (49), so as to couple the extractor (1) and the screw (13) in rotation;
- c) extracting the screw (13) by loosening it using a key adapted to the head (7) of the extractor;
- wherein the step of fitting an extractor (step b) includes the use of a punch mandrel (51) placed between the extractor (1) and the percussion tool (49) and one end of which having a recess (53) adapted to the head (7) of extractor (1).
Dependencies are inferred from the claim text.