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Plug bolt

A technology of expanding bolts and bolts, applied in the direction of bolts, screws, threaded fasteners, etc.

Inactive Publication Date: 2020-06-30
UNIVERSITY OF JOHANNESBURG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the event of damage to the threads of the heat exchanger, the device must be repaired or, if repair is not possible, the device must be replaced

Method used

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Experimental program
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Embodiment Construction

[0038] Referring to the drawings, in which like features are indicated by like reference numerals, and expansion bolts are generally indicated by reference numeral 1 .

[0039] The expansion bolt 1 includes a main body having a main head 3 at one end of the bolt 1 and a threaded portion 4 at the opposite end of the bolt 1 . The threaded portion 4 engages a complementary thread in a device (not shown) and the main head 3 is used to tighten the bolt 1 . exist Figures 1 to 3 In the example shown, the main head 3 is in the form of a hexagonal bolt head so that standard tools can be used to tighten the bolt 1 . The bolt 1 is generally elongated, and the threaded portion is cylindrical. Bolts are usually made of carbon steel such as SA-105 / SA-105M or SA-106 / SA-106M.

[0040] The bolt comprises a secondary head 5 between the main head 3 and the threaded part 4 . exist Figures 1 to 3 In the example shown, the secondary head 5 is in the form of a hexagonal bolt head. In another...

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PUM

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Abstract

This invention relates to a plug bolt (1) and more specifically, but not exclusively, to a plug bolt (1) for use with a device such as an air-cooled heat exchanger. One of the problems with conventional plug bolts is that when the bolts are over tightened, it may damage the thread of the device it is installed in. Once the thread is damaged it has to be repaired, causing downtime, or where it is not possible to repair, the device will have to be replaced. It is accordingly an object of this invention to provide a plug bolt (1) which, at least partially, alleviates some of the problems associated with the prior art. It is envisaged that the invention will provide a plug bolt (1) which fails before it is overtightened to prevent damage, is easy to manufacture, and is as simple to use as theprior art.

Description

technical field [0001] The present invention relates to expansion bolts, and more particularly but not exclusively to expansion bolts for use with air cooled heat exchangers. Background technique [0002] Expansion bolts (or inspection bolts) are known in the art. An expansion bolt may provide access to the interior of an oil tank, pressure vessel, or other part of a machine or equipment for inspection or maintenance purposes. Expansion bolts typically cost orders of magnitude less than the equipment they are installed on. [0003] An example of the use of expansion bolts is air-cooled heat exchangers, where the bolts are used to provide access to the inside of the tubes used in the heat exchanger. Specifically, a plurality of bolts are used to seal the bolted sheet connected to the tube sheet. Regular cleaning and inspection of the heat exchanger's tubes is critical to maintaining performance and extending equipment life. [0004] One of the problems with traditional ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B31/02F16B23/00
CPCF16B23/003F16B23/0038F16B31/021
Inventor 德文·约翰·科策安德烈·莱昂·纳尔
Owner UNIVERSITY OF JOHANNESBURG