Insulating screw anchors

Abstract

Insulating screw anchor made of plastic for fastening in a soft material in the form of an insulating material, comprising a shaft (2) with a cylindrical outer shell (3) and a cylindrical insertion hole (4), in which an external thread (5) is attached to the outer shell (3), wherein the shaft has a head (14) with a contact flange (16), wherein the shaft (2) of the insulating screw anchor (1) is divided into a tip region (6), a middle region (7) and a rear region (8) which adjoins the head (14), wherein the external thread (5) extends from the rear region (8) of the shaft (2) over the middle region (7) to the tip region (6),wherein the shaft (2) has a constant diameter (D1) in the central region (7) and in the rear region (8), and the outer diameter (D2) of the external thread (5) is constant over the rear region (7) and central region (8), and the distance between two adjacent thread flanks (11) of the external thread (5) is constant over the entire length of the shaft (2), and the thread flanks (11) have constant flank angles (12, 13) over the entire length of the insulating screw anchor, whereby the screw-in depth of the insulating screw anchor (1) can be subsequently adjusted while still maintaining a firm hold, wherein the tip region (6), which extends over at least several threads (9, 9') of the external thread (5), is conical, wherein the contact flange (16) is designed to seal, and wherein the insertion hole (4) has a metric or imperial thread (10).

Claims

[1] Insulating screw anchor made of plastic for fixing in a soft material in the form of an dam material comprising a shaft (2) with a cylindrical outer shell (3) and a cylindrical insert hole (4), in which an external thread (5) is attached to the outer casing (3), wherein the shaft has a head (14) with a contact flange (16), wherein the shaft (2) of the insulating screw anchor (1) is divided into a tip region (6), a middle region (7) and a rear region (8) which adjoins the head (14), wherein the external thread (5) extends from the rear region (8) of the shaft (2) over the middle region (7) to the tip region (6), wherein the shaft (2) has a constant diameter (D1) in the middle region (7) and in the rear region (8) and the external diameter (D2) of the external thread (5) is constant over the rear region (7) and middle region (8), and the distance between two adjacent thread flanks (11) of the external thread (5) is constant over the entire length of the shaft (2) and the thread flanks (11) over the entire length of the Insulating screw anchors have constant flank angles (12, 13),whereby the insulating screw anchor (1) at white, the screw-in depth can subsequently be changed while retaining a firm hold, wherein the tip region (6), which extends over at least several turns (9, 9') of the external thread (5), is conical, wherein the contact flange (16) is designed to be sealing, and wherein the insert hole (4) has a metric or inch thread (10). [2] Insulating screw anchor according to claim 1, characterized by that the thread (10) extends over at least part of the length of the insert hole (4). [3] Insulating screw anchor according to one of the preceding claims, characterized by that the thread flanks (11) have a lower flank angle (12) of 30°. [4] Insulating screw anchor according to one of the preceding claims, characterized by that the thread flanks (11) have an upper flank angle (13) of 8°. [5] Insulating screw anchor according to one of the preceding claims, characterized bythat the head (14) is provided with a projection (15) with a multiple edge outline. [6] Insulating screw anchor according to claim 5, characterized by that between the contact flange (16) and the beginning of the external thread (5) there is a bulge (17) which tapers conically towards the tip of the shaft (2). [7] Insulating screw anchor according to claim 6, characterized by that the contact flange (16) on the threaded side of the head (14) together with the bulge (17) forms a joint (19). [8] Insulating screw anchor according to claim 7, characterized by that the joint (19) is suitable for accommodating a seal. [9] Insulating screw anchor according to one of the preceding claims, characterized by that the insulating screw anchor is made in one piece.

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