Bench for machining elongate objects such as strips of marble an

Details Bench for machining elongate objects such as strips of marble an Bench for machining elongate objects such as strips of marble an

1999-05-03

2000-05-16

McDonald, Shantese

Abrading

Work holder

Vacuum

125 35, 269 21, 269303, 269307, B24B 4700

Patent

active

060629622

DESCRIPTION:

BRIEF SUMMARY
THE PRESENT INVENTION RELATES TO A BENCH FOR MACHINING ELONGATE OBJECTS OF
MARBLE-AND THE LIKE.
Decorative strips of marble or the like requiring special machining for their shaping and polishing and other operations are in current use.
One difficulty encountered in the machining of objects of this kind on a craft or semi-craft basis, without resorting to large machines for industrial machining whose use for small work would be uneconomical, is that of how to fix a workpiece securely so that a portable-type moulding machine can work on it.
Clearly, this temporary fixing of objects of elongate shape or strips of this kind for the purpose of machining them must be stable and secure, and yet must not use clamps or equivalent means which would interfere with the machining processes, especially when portable profilers of known type are used.
It is therefore an object of the present invention to provide a machining bench for machining elongate objects or strips of marble or the like that have to be machined in the direction of their length without requiring the use of clamp-type fixing means or equivalents thereof
The present invention provides a bench for machining elongate objects that comprises a generally boxlike body having a surface over which a portable profiling machine can be moved, and a side comprising means for holding strips or the like in position by means of a plurality of pneumatic suction inlets which, by the action of low pressure, hold the elongate object stably during its machining.
The present invention also provides an element for supporting the workpiece and positioning it correctly, with the aid of a pair of graduated elements arranged for the repeatable adjustment of the position of the workpiece and for ensuring it is parallel with the upper surface of the machining bench.
The present invention will now be described with reference to a currently preferred embodiment of the same, supported by the figures of the appended drawings, in which:
FIG. 1 is a perspective view of the machining bench according to the present invention;
FIG. 2 is a perspective view of the machining bench shown in FIG. 1 on which an elongate object or strip extending roughly the full length of the machining stroke is fixed for machining;
FIGS. 3 and 4 are views similar to FIG. 1 of the machining bench, on each of which are fixed workpieces with different proportions to those of the strip object shown in FIG. 2;
FIG. 5 shows the same view of the machining bench of FIG. 1, on which different types of strip object are fixed;
FIG. 6 is a side view of the machining bench according to the invention with parts removed to show the internal components; and
FIG. 7 is a side view of the machining bench according to the invention in conjunction with a typical profiling machine.
Referring to the abovementioned figures, the machining bench comprises a boxlike body 1 standing on feet 2, 3 and having an upper surface 4 over which a profiling machine can be moved, and a surface 5 against which the elongate objects or strips to be machined are leaned and on which they are retained.
As can be observed in FIG. 1, the surface 5 has a plurality of low-pressure pneumatic suction inlets 6, 7, 8, 9 running along the top dose to the edge formed by surfaces 4 and 5. At the ends of the surface 5 are two grooved elements 10, 11 having slots 12 in which clamping pins 13, visible in FIG. 6, can slide. These pins 13 are connected to levers 14, 15 for clamping in position a supporting bar 16 comprising a right-angled stiffening part 17.
Parts 10, 11 are conveniently provided with a millimetric or other similar scale 18, 19 to provide a positioning reference with respect to the upper surface 4 of the supporting bar 16 on which the workpieces are rested.
As can be seen, FIGS. 2 to 5 show the same view of the machining bench as in FIG. 1, on which various types of elongate objects or strips are positioned and fixed for machining.
More particularly, FIG. 2 shows the machining bench of the invention on which is positioned a strip object 20 of considera

REFERENCES:
patent: 3294392 (1966-12-01), Dunham
patent: 3627299 (1971-12-01), Schwarze
patent: 4184292 (1980-01-01), DeFazio et al.
patent: 5003729 (1991-04-01), Sherby
patent: 5318005 (1994-06-01), Mayer
patent: 5758869 (1998-06-01), Redeker
patent: 5775395 (1998-07-01), Wilkins

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