Process for making an expansion screw for orthodontics and screw thus made
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United States of America Patent
Stats
-
Nov 11, 2003
Grant Date -
Oct 3, 2002
app pub date -
Sep 26, 2001
filing date -
Apr 2, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention refers to a process for making an expansion screw and a screw thus made; the expansion screw (100, 100') has two bodies (1, 2) that can be spaced apart by acting on the driving portion (6) of a double screw (3) housed within threaded central bores (30) provided in the two bodies (1, 2); each of the bodies (1, 2) has at least one bore (5, 50) parallel to the threaded bore; also provided is at least a hollow cylindrical guide (9) housed within a corresponding pair of parallel bores (5, 50) disposed on the two bodies (1, 2) in facing relationship; inserted in each guide (9) is a pin (4) for sliding therein; each guide (9) is fixed to one of the bodies, while the relevant pin (4) held therein is fixed to the other body, and the sliding of the pin (4) relative to the guide (9) takes place with friction owing to the force exerted upon assembly.
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