Geometrical instruments – Scriber – Pantographic
Patent
1986-01-22
1987-09-22
Haroian, Harry N.
Geometrical instruments
Scriber
Pantographic
33 2712, 266 58, B43L 1310
Patent
active
046945792
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a device for guiding a tool along a curve, said device comprising a holder for the tool being movable in one plane and being so connected to a curve follower, which is adapted to follow a predetermined guide curve in the same or another plane, that the holder and the tool follow a path corresponding to the path of the curve follower.
A tool of the kind here intended can be e.g. adapted to discharge sealing compound, or, be a cutting torch, a corresponding device then serving for repeatedly distributing sealing compound over the sealing surfaces of identical objects, or, cutting identical sheet metalpieces.
In a known device of the kind initially stated, which serves to apply a string of silicone sealing compound on joint surfaces, the curve follower is a roller, which is freely rotatably journalled in one end of a horizontal arm. The roller engages from underneath into and runs along a slot milled through a plate. Since this slot describes a closed pattern the central part of the plate must be suspended, which is done in the support for the object to be charged with sealing compound. The tool, an extrusion device for the sealing compound, is mounted in the end of a manually operable arm, which horizontally is rigidly connected to the arm just mentioned. The two arms are commonly pivotedly connected to a third arm, such that the roller and the extrusion device are freely movable in one horizontal plane each.
Apart from the evident drawback that a closed guide slot requires suspension of the central part of the plate, i.e., one defining curve of the guide slot, a milled guide slot requires expensive machines and time consuming work to be accomplished. Further, the manual operation of the tool involves--even with the most skilful operator--that the movement along the curve hardly can take place with a constant speed, which in turn results in that the string of sealing compound receives a varying thickness if it is extruded with a continuous flow. This in turn may have devastating consequences, particularly if too much sealing compound is extruded, since sealing compound forced outside sealing surfaces may come loose and stick in e.g. the cooling channels of a combustion enginge.
The present invention has as its object to provide a device of the kind initially stated, which allows the utilization of particularly cheap, simple and easily shapable guide curves, along which the curve follower is movable in an even speed.
This object has been achieved in that the invention has received the characteristics stated in the following claims.
One example embodying the invention will be described below, reference being made to the accompanying drawings, wherein FIG. 1 is a partially broken up perspective view showing a device according to the invention adapted to apply a string of sealing compound along a closed path, FIG. 2 shows at a larger scale and likewise in a perspective view a curve follower and a portion of a guide curve according to the invention, and FIG. 3 shows a section taken along the line III--III of FIG. 2 through the curve follower as well as the guide curve.
Above a plane, rectangular base 1 is mounted, by means of columns 2, a likewise rectangular working plane 3. Upon the base 1 rests a plane plate 4, which by means not shown is attachable to the base. On the plate 4 is mounted a guide curve 5, which will be further described below.
Between the base 1 and the working plane 3 is arranged a coordinate table of a known kind comprising a cylindrical bar 6, which is parallel to and located close to an edge of the base 1. An L-bar 7, against which advantageously abuts one edge of the preferably rectangular plate 4, is mounted parallel to the bar 6 at the opposite edge of the base 1. By means of ball bushings 9 a first carriage 8 is movable along the bar 6. Also the carriage 8 comprises a cylindrical bar 10 and an L-bar 11 parallel thereto, both being perpendicular to the bar 6. By means of rolls not shown, e.g. in the shape of roller bearings, the carriage 8 is supported on t
REFERENCES:
patent: 1646129 (1927-10-01), Wagner
patent: 2068166 (1937-01-01), Dodge
patent: 2087678 (1937-07-01), Wagner
patent: 2904886 (1959-09-01), Morehead
Haroian Harry N.
Teltscher Erwin S.
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