Geometrical instruments – Gauge – Pipe layout or fitting
Patent
1993-05-26
1995-01-24
Cuchlinski, Jr., William A.
Geometrical instruments
Gauge
Pipe layout or fitting
335611, G01B 520
Patent
active
053832825
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to saddle-joint jigs.
BACKGROUND TO THE INVENTION
In many fields there is a need to join tubes together at right angles to their longitudinal axes--such joints are known as saddle joints and, by way of example, one is shown schematically in FIG. 1. In order to join a first tube end on to the side of a second tube in this way it is necessary to cut the end of the first tube so that it matches the exterior shape of the second tube allowing it to be joined to the second tube in end-to-edge abutment. In even the simplest cylindrical case, involving circular-cylindrical tubes, where a first tube joins a second tube at a right angle it is a relatively complex operation to determine exactly the shape that the end of the first tube needs to be cut to in order to fit the second tube.
The conventional method for reproducing the necessary shape of the end of the first pipe in order for it to fit to the second pipe involves the use of relatively complex Euclidean geometry calculations to arrive at a curve which can be drawn on a piece of paper. The paper is wrapped around the tube and used as a guide-line along which a cut is made.
A skilled and experienced technician is generally required to carry out these calculations and the process is a protracted one.
Furthermore, in such a lengthy and complex process there is always a significant risk that an error may be made, which can result in an expensive mistake.
Evidently there is a need for a simpler method of reproducing the shape to which a first tube must be cut when joining it in end-to-edge abutment to a second tube.
SUMMARY OF THE INVENTION
Accordingly, the present invention provides a saddle-joint jig for reproducing the line of contact of a first tube in relation to a second tube so that the first tube, when cut along that line, may be joined in end-to-edge abutment to the second tube in that same relation; which jig comprises at least three generally parallel pins each of which is slidingly held to allow each pin to slide longitudinally when a force is applied thereto; the pins being held in a band that, in use, is capable of circumferentially enclosing the first tube.
The present invention further provides a method of reproducing the line of contact of a first tube in relation to a second tube so that the first tube, when cut along that line, may be joined in end-to-edge abutment with the second tube in that same relation; the method comprising the use of a saddle-joint jig described above.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic representation of a saddle-joint involving two hollow circular-cylindrical tubes;
FIG. 2 is a diagrammatic plan view of a jig in accordance with the present invention, the jig has been shortened for clarity;
FIG. 3 is a diagrammatic front view of the jig shown in FIG. 2 with the stitching removed for clarity;
FIG. 4 is a diagrammatic enlarged side view of one of the pins shown in FIGS. 2 and 3;
FIG. 5 is a diagrammatic plan view of the jig shown in FIGS. 2 and 3 in use;
FIG. 6 is a diagrammatic plan view of the jig shown in FIGS. 2 and 3 in an intermediate stage of its use; and
FIG. 7 is a diagrammatic plan view of the jig shown in FIGS. 2 and 3 at a later stage of its use.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention will now be described, by way of example only, with reference to the drawings that follow.
Referring now to FIGS. 2 and 3 of the drawings that follow there is shown a saddle-joint jig 2 comprising a first strip of webbing 4, a second strip of webbing 6, a plurality of substantially similar pins 8a-8h, stitching 10 (not shown in FIG. 3), a first strip of fastening material 12 and a second strip of co-operating fastening material 14.
The first and second strips of webbing 4 and 6 respectively are held together in face-to-face relation by the stitching 10 to comprise a band. The first strip of webbing 4 is approximately twice as thick as the second strip of webbing 6. The stitching 10 is machined in a plurality of evenly (optional) s
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Doerr Derek V.
Field Robert W.
Bennett G. Bradley
Cuchlinski Jr. William A.
Field Robert W.
Kingston Gordon J.
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