US1690909A - Tubular fibrous wall plug - Google Patents

Description

Nov. 6, 1928. 1,690,909 J. J. RAWLINGS l TUBULAR FIBROUS WALL PLUG Filed March 26, 1926 TUBULAK CEEE OF LUBK CATLHG MATERIAL klm? Patented Nov. 6, 1928.

UNITED STATES PATENT OFFICE.

JOHN JOSEPH BAWLINGS, OF SOUTH KENSINGTON, LONDON, ENGLAND, ASSIGNOR F ONE-HALF T0 THE -RAWLPLUG COMPANY LIMITED, OF LONDON, ENGLAND.

TUBULAR FIBROUS WALL PLUG.

Application filed March 26, 1926, Serial No. 97,801, and in Great Britain March 28, 1925. A'

This invention relates to improvements in tubular fibrous wall plugs of the kind comprising a number' of twisted fibrous strands laid side by side and weakly held together,

and the said invention provides improvements whereby the insertion of a nail or screw in a plug placed in a hole in a wall, or the like, is facilitated.

Wall plugs of the type hereinabove referred to, in, which the fibrous strands are held together by an adhesive or by weak binding strands of fibrous material,- as is well known, are expanded by the nail or `screw inserted therein and, in some cases, a

difficulty is experienced in driving in the nail or screw owing to the gripping action exerted thereon, more particularly when the strands comprised in such plugs are united, or loaded, with adhesive substances, such as '20 glug/bitumen, gum, resin, and the' like, or

a mixture of such adhesive substances, ow` ing to the combined effects of the heat developed by friction and the pressure exerted in expanding the plug, increasing the tendency of the nail or screw to adhere to the interior wall of the plug. A purpose of this invention is to provide means for minimizing this gripping or sticking of the nail or screw to the plug into which it is being driven.

According to this invention a tubular wall plug is provided comprising a number of twisted fibrous strands laid side by side and weakly held together by an adhesive havin a thin layer of lubricant such' as graphite, steatite, grease or the like applied.

as alining or coating on the interior wall only of the plug.v In one convenient arrangement according to this invention, a strip of paper or of textile fabric is im- 40 pregnated with graphite, ste'atite, grease, or other suitable lubricant, or a mixture of these substances, and is arranged as a lining within the plug'.

In another arrangement, in accordance with this invention, the lubricating material in a powdery or pasty form is applied to the interior of the wall plug without employing a separate'lining material to hold or support it.

The accompanying drawings illustrate how the said invention can be conveniently and advantageously carried into practice:

In this drawing :-l 4 kFigure 1 is a diagrammatic perspective Figure 2 is a diagrammaticview of apparatus suitable for producing a wall plug as shown in Figure 1.

Figure l shows a wall plug comprising a number of twisted fibrous strands a laid side by side in tubular formation around a tube b of paperl or textile fabric impregnated with a suitable lubricant, inserted in the plug during the manufacture of the same by winding, wrapping or feeding the strip on a mandrel employed to form the tubular wall plug, and the strands comprised in the plug can then be built u on the lubricated strip thus brought to a tu ular form, by any of the known methods of manufacture em ployed to produce this type of plug, the strip being drawn of the mandrel as the strands are brought together thereon, as will be readily understood, thus providing a continuous lubricating lining within the tube formed 'by the strands.

The continuous length of tubular material thus formed can be cut to convenient lengths to form wall plugs. Such wall plugs can be cut from a length of tubular material produced by apparatus, as shown yin Figure 2 comprising a reel 0 from which a strip of paper or textile material b' is fed on to a mandrel d around which it is wrapped by passing through a substantially conical guide tube e. The tube of paper or textile fabric thus formed, impregnated with lubricant, is led between the mandrel and a guide plate f to which the strands a of twisted fibrous material are led from 4spools g. In passing through the annular" or like tube and the strands are consolidated in a tubular formation.

The mandrel d, as shown in Figure 2, can be made tubular so that pulverulent, pasty or liquid lubricant can be pumped or fed through the, same into the interior of the tube formed by the strands a brought to the required formation as they pass between'the guide plate and the mandrel before they pass off from the end of the latter.

By mounting the spools g on a rotary head the strands in the tube produced can be givstraight in the longitudinal direction o the tube.V

- en a spiral arrangement instead of l ingv bricating linin which prevents undue fric;

tion between t e nail or vscrew and the interior wall of the tubular plug when the nail or screw is driven therein, and provides a plug especially suitable for holding screws which may be required to be withdrawn and replaced in the same hole from time to time..

In use the improved wall plug provided with a lubricant lining `operates in the same manner as the brous tubular .walplugs heretofore known, the wall plugs being eX panded by the nail or screw driven therein iso as to grip or clanip the nail or screw firmly in the hole in which the plug :has been 7 inserted. The layer' of lubricant thus provided is suiiicient to` facilitate the driving of the' screw or nail into the plug without diminishing the gripping effort exerted on the 1. A tubular wall plug comprising a number of twisted fibrous strands laid side by side and an inner tubular lining of fibrous sheet material impregnated with a lubricant.

2. A tubular wall plug comprising a number of twisted fibrous strands laid side by side and an inner tubular lining of paper impregnated with a lubricant.

3. A tubular wall plug comprising a number of twisted fibrous strands laid side by side in Contact, and held together in tubular formation by an adhesive cement and a lining of lubricant on the interior wall only of the tubular structure.

4:. A tubular/wall plug comprising a number .of twisted fibrous strands laid side by Qside and weakly held together by an adhesive cement, a lubricant on the interior wall of said tubular formation of -ibrous strands, and means for carrying said lubricant. t JOHN JOSEPH RAWLINGS.

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