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Drop-in anchor and drop-in anchor systems

An expansion screw and internal pressure technology, which is applied to the internal pressure expansion screw system and internal pressure expansion screw. field, can solve problems such as large placement force

Inactive Publication Date: 2012-02-29
BLACK & DECKER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, prior art internally forced expansion screws require considerable settling force, which is usually obtained by applying a relatively large number of blows with a heavy hammer

Method used

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  • Drop-in anchor and drop-in anchor systems
  • Drop-in anchor and drop-in anchor systems
  • Drop-in anchor and drop-in anchor systems

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] figure 1 An internal force expansion screw 10 is shown. The expansion screw 10 includes a sleeve 12 . The sleeve 12 is generally tubular and radially expandable at an expanded end 14 . To enable expansion capability, the cannula 12 includes one or more expansion openings 16 extending from the expanded end along a portion of the length 18 of the cannula 12, or other similar structure that allows for an increase in the diameter of the cannula at the expanded end 14. The inner wall 20 of one embodiment of the sleeve 12 includes threads 22 at a threaded end 24 opposite the expansion end 14 to receive threaded fasteners (not shown) for use once the expansion screw is installed in, for example, concrete When in masonry, the required items are fixed to the expansion screws 10 . It will be appreciated that although internally forced type expansion screws are provided with internal threads (i.e., as figure 1 Threads on the inner surface of the sleeve 12 shown in ) are common...

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PUM

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Abstract

A drop-in anchor comprises a tubular sleeve (12) having a first end (24) and an expandable second end (14). The sleeve has an internal taper narrowing in a direction from the first end to the second end at a sleeve taper angle (30). The drop-in anchor further comprises a plug (26) insertable in the sleeve such that when the plug is driven into an installed position in the sleeve an external surface thereof engages said internal taper to expand the second end (14). The plug: i) is a cylindrical body having substantially zero taper; or ii) the external surface tapers at a plug taper angle (36) that is different to said sleeve angle (30) such that there is a difference between the sleeve taper angle and the plug taper angle of at least about one degree.

Description

technical field [0001] The invention relates to an internal pressure expansion screw system and an internal pressure expansion screw. Background technique [0002] Capscrews used, for example, to secure items to masonry typically include sleeves that are placed in pre-drilled holes. The plug is driven into an expandable portion of the sleeve which upon expansion secures the sleeve in the bore. The item may be secured to the masonry by the threaded end of the sleeve opposite the expandable portion of the sleeve. [0003] In a typical forced-in expansion screw, the plug is frusto-conical, thereby providing an outer surface that matches the inwardly tapering inner wall of the sleeve. This condition has long been understood to be the most efficient configuration for an inset screw, as the angled surfaces have been understood to work together to achieve the desired effect, while using the angle to make insertion as easy as possible. However, prior art internally forced expansi...

Claims

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Application Information

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IPC IPC(8): F16B13/06B25B27/14
CPCB23B51/12B25B31/00F16B13/063F16B13/0833F16B2200/95
Inventor 艾伦·J·阿曼多利杰·布兰登罗伯特·勒巴巴拉杰柯柏·欧森
Owner BLACK & DECKER INC