FR2615916A1 - Eccentric screw and anchor bolt - Google Patents

Abstract

Screw and anchor bolt allowing accurate fixing. This screw and anchor bolt are made up with eccentric excess thicknesses. These eccentric excess thicknesses may be either: - with "short offset" or - with "long offset" thus allowing efficient use in the fixings to be obtained. This eccentric screw and anchor bolt are more particularly intended for fixing requiring a certain accuracy.

Description

 The present invention relates to new screws and new eccentric lag screws.

 The eccentric screws and lag bolts will give the possibility of obtaining, by the usual simple tightening movement, precision in the fixings.

 In practice, there often happens an 18Ber offset between the hole made in the support and that of the part to be added if this poses problems, for example, when there are levels to respect. To remedy ~ said problems most often we make a new hole where a waste of time and energy. By the use of eccentric screws and lag screws the curve of these must allow to compensate for these defects at the time of normal tightening.

 The screws and lag screws will be offset according to the initial diameter; it goes without saying that the larger the screw or the lag screw, the larger the curve can be.

 This new type of manufacturing can be applied to screws with embers, round heads, heads of tallow, cruciform head; with "parker" screws and lag screws whatever the diameter and length of each of the products.

 The accompanying drawings illustrate the invention.

 Figure 1 shows a part of the screw on the side where the offset is greatest.

 FIG. 2 represents a section of FIG. 1.

 Figure 3 shows face to face a screw "eccentric11 and an ordinary screw the eccentric screw is seen at an angle where the curve is the most important.

On the other hand its offset (2) is located just near the head of the screw (hence the name "short offset").

Figure 4 represents an eccentric screw and an ordinary screw t face to face
The eccentric screw is seen from an angle where the curve is most important.

On the other hand its offset (3) increases from the pitch of the screw at the head of the screw (hence the name "long offset").

 FIG. 5 represents an eccentric lag screw and an ordinary lag screw face to face. The eccentric lag screw is seen from the side where the curve is most important; on the other hand its offset (4) is located just near the head of the lag screw (hence the name "short offset").

 FIG. 6 represents an eccentric lag screw and an ordinary lag screw face to face. The eccentric lag screw is seen from the side where the curve is most important. on the other hand, its curve (5) begins in crescent from the screw thread 9 the head of the lag screw (hence the name "long offset").

 The rigure 7 represents face to face an eccentric parking screw and an ordinary parking screw. The eccentric parker screw is seen at an angle where the curve is most important 1 on the other hand its offset (6) is located just near the head of the screw (hence the name "offset offset").

 In FIGS. 3, 4, 5, 6 and 7 of the eccentric screws and lag screws a hatched part has been drawn in order to realize the added "thickness".

 The eccentric bolts and screws are particularly intended for fasteners requiring a certain precision.

Claims (6)

 1) Screws or lag bolts which allow fastenings with great precision, characterized in that they include an eccentrically thick esne (1).  2) Screw according to claim 1 characterized in that near the head of the screw there is an eccentric "extra thickness" (2) called "short offset".  3) Screw according to claim 1 characterized in that in the area without screw pitch there is an eccentric "extra thickness" going from the screw pitch to the head of the screw (3) called long offset ".  4) Lag screw according to claim 1 characterized in that near the head there is an eccentric "extra thickness" (4) called "short offset".  5) Lag screw according to claim 1 characterized in that in the area without screw thread there is an eccentric "extra thickness" going from the screw thread to the head of the lag screw (5) called "long offset".  6) Parking screw according to claim 1 characterized in that near the head there is an eccentric "extra thickness" (6) called "short offset".