Cutlery – Cutting tools – With guard and/or guide
Patent
1990-04-23
1992-01-14
Watts, Douglas D.
Cutlery
Cutting tools
With guard and/or guide
33257, B26B 2900, G01B 100
Patent
active
050798421
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a guide for use in making a cut in a flexible sheet member such as a carpet.
The laying of floor coverings such as carpets often necessitates the forming of straight seams, which are to be as tidy and unobtrusive as possible.
Carpets are often formed of tufts of material embedded in a flexible backing. A problem arises when forming straight edges in portions of carpet which need to be abutted together. A cut often leaves half cut tufts and missing tufts along the cut edge of the carpet. When a seam is formed between two such edges of adjoining portions of carpet, the result is an obtrusive seam or "valley" of missing tufts.
There is a need to form an edge in a portion of flexible sheet member or floor covering such as a carpet, so that a tidy unobtrusive seam will be made when that edge is abutted against another edge, e.g., of another portion of carpet.
According to one aspect of the invention, there is provided a guide for use in making a cut in a flexible sheet, such as a carpet, the guide comprising a base having a substantially flat upper surface portion, an elongate channel to receive a cutting device such as the blade of a knife extending adjacent the upper surface portion, the flexible sheet being arranged in use to overlie the upper surface portion and the channel, wherein an inner sidewall of the channel is at an oblique angle relative to the upper surface portion and the cutting device in use is urged towards that inner side wall to produce a cut which is at an oblique angle to the plane of the sheet.
In a preferred embodiment, the opposing inner side walls of the channel are inclined downwardly and diverge at a first angle.
Preferably the floor of the channel includes a generally central longitudinal ridge to divide the channel into two portions.
In another aspect of the invention there is provided a method of joining two portions of a carpet or like sheet material in side-by-side relation comprising the steps of:
placing the channel of a guide according to the invention under the margin of the first portion of the carpet;
inserting the blade of a knife in the channel and urging the blade towards that inner side wall of the channel which is adjacent the body of the carpet;
moving the knife along the channel so as to make a cut along the length of the carpet, at an oblique angle to the plane of the carpet;
discarding the marginal strip thereby cut off;
placing the second portion of carpet to be joined so that its margin overlies the channel and
repeating the above steps;
removing the guide; and
allowing the cut edges to fall together and sticking them with an adhesive or sewing them together.
Guides for cutting heavy fabrics such as rugs are known from U.S. Pat. No. 3, 772,793, but this guide is not for use in producing an oblique cut.
In order that the invention may be better understood it will be described with reference to the accompanying drawings in which;
FIG. 1 is a plan view from above of one embodiment of the guide of the invention; and
FIGS. 2 and 3 are schematic views from one end of a guide according to FIG. 1 in use.
The guide comprises an elongate base 1 formed, e.g., as an extrusion from aluminium, lightweight alloy or the like. The base 1 has a substantially flat underside 2. The upper surface is formed with two opposing side ramp portions 3 and an elongate channel 4 extends along the apex of the base 1. The inner side walls 5 of the channel 4 extend downwardly from the upper surface and diverge from each other at a first angle. A short raised ridge 6 (FIG. 2) extends longitudinally along the centre of the floor of the channel 4, the side walls of the ridge 6 extending generally parallel to the facing inner side walls 5, better to guide a knife blade 11 to cut along a predetermined path, as explained below.
The guide is formed with elongate holes 7 extending inwardly to the base 1 from one end face 8. Lengths of dowling or similar (not shown) may be received in these holes 7 to join one guide to another in an end-to-end relation. The other end face 9 of t
REFERENCES:
patent: 3772793 (1973-11-01), Anderson et al.
Duralay Limited
Watts Douglas D.
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