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Screw

A technology of metal parts, screws, applied in the field of screws for assembling metal frame parts on construction

Inactive Publication Date: 2006-03-08
ILLINOIS AFC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although usually the hole is located in the center of the recess or dimpled area formed during drilling into which the head of the screw can rest, existing screw heads for this purpose have a very high perimeter which makes the screw The perimeter of the head protrudes above the surface of the frame part

Method used

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Embodiment Construction

[0018] The screw of the invention, as shown in the accompanying drawings, comprises a threaded body 2, preferably a serrated thread, so that when the screw is used for the fastening of relatively thin metal parts, the serrated thread provides improved pull-out resistance. The lower surface 4 of the screw head comprises a substantially flat bottom surface 6 and a peripheral surface 8 extending upwards and outwards from the surface 6 . The upwardly extending peripheral surface 8 reaches via the edge 9 a slightly dome-shaped upper surface 10 . In the central part of the head 4 there is made a socket 12 for receiving a suitable driver such as an Allen key.

[0019] Figure 4 Screws are shown to be used to secure together two metal frame parts 14, 16 each pre-drilled with holes to accommodate the screws in threaded engagement. As shown in the figure, each hole is located at the center of the recess formed when punching the hole. The recess includes a substantially circular sinkin...

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PUM

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Abstract

A screw for driving into threaded engagement with a hole formed in a dimpled zone in a metal frame section is shaped such that a peripheral edge surface of the head is able to sit within the dimpled zone. The head thereby does not present a substantial impediment to sliding movement across the surface of the frame section.

Description

technical field [0001] This invention relates to screws, and more particularly, the present invention relates to screws for use in assembling metal frame components in construction. Background technique [0002] When metal frame parts for construction are assembled together, it is possible to pre-drill holes for fastening screws on the frame parts, and then use fastening screws to fasten adjacent frame parts that have also been drilled in the same position. Together, the fastening screws are threadedly engaged with the holes. Although usually the hole is located in the center of a recess or dimpled area formed during drilling into which the head of the screw can rest, existing screw heads for this purpose have a high perimeter which makes the screw The perimeter of the head protrudes above the surface of the frame part. In a location such as a factory, where trusses and other frames are preassembled, this high protruding perimeter of the screw heads could catch other compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16B35/06F16B39/28F16B23/00F16B25/00
CPCF16B35/06F16B25/00
Inventor 弗朗西斯伯纳德托维纳特
Owner ILLINOIS AFC