Gear cutting – milling – or planing – Milling – Randomly manipulated – work supported – or work following device
Patent
1989-06-20
1991-07-02
Howell, Daniel W.
Gear cutting, milling, or planing
Milling
Randomly manipulated, work supported, or work following device
144134D, 409138, 409178, 409204, B23C 312
Patent
active
050281798
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to machines for chamfering sheets, plates or panels.
Generally, these chamfering machines comprise means for bearing on the surface of the work piece and for guiding against the edge to be chamfered.
Different models of chamfering machines are known at the present time among which some are light but permit neither the formation of the chamfer on non-rectilinear edges nor the adjustment of the angle of the chamfer which is in most cases fixed at 45.degree..
In another heavier model of a chamfering machine which operates by planing, the angle of the chamfer can only be modified by changing the tool; moreover, the state of the surface after planing is unsatisfactory, which is unacceptable in the field of aeronautic construction.
An object of the invention is to overcome the drawbacks of conventional chamfering machines.
The invention therefore provides a machine for chamfering sheets, plates or panels comprising a body including means for guiding along the edge of the work piece to be chamfered, said machine further comprising on the body bearing and rolling means, the guiding means being constituted by adjustable claws adapted to bear against the edge of the work piece to be chamfered, and a router including a milling cutter mounted on the body to be pivotable in a plane perpendicular to said edge, said milling cutter being located between said claws.
According to one embodiment, said bearing and rolling means are constituted by two pairs of rollers which project from a side of the body and together define a plane.
According to another feature of the invention, the machine comprises an elongated element mounted in the body to be longitudinally slidable between spindles of said pairs of rollers in a direction parallel to said spindles, and said claws are formed at one end of said element.
Advantageously, said element is connected to an adjusting device comprising a screw engaged with the body and carrying a control knob.
According to an embodiment, two trunnions are provided which are fixed on sides of the body on each side of said slidable element carrying the claws and define the router pivot axis which is perpendicular to said element.
Advantageously, the router is fixed between two side walls each defining an opening through which a respective one of said trunnions extends.
According to another embodiment, the body is adapted to straddle the edge of the work piece to be chamfered and comprises for this purpose a slot which extends in a direction parallel to said plane and into which slot said rollers project, said slot extending a little beyond said claws.
Preferably, the machine comprises means for indexing the angular position of the router relative to the body.
These indexing means are formed by apertures arranged along at least one arc of a circle in a side wall, by at least one aperture in the adjacent wall of the body and by a pin which is capable of being inserted in one of the apertures of the side wall and body.
When the body is adapted to straddle the edge of the work piece to be chamfered, it comprises a roller which is mounted in the body to be slidably adjustable in a direction perpendicular to said slot and is in opposed relation to said pairs of rollers.
The following description, with reference to the accompanying drawings given as non-limitative examples, will explain how the invention may be carried out.
FIG. 1 is a side elevational view of an embodiment of a chamfering machine according to the invention.
FIG. 2 is a view similar to FIG. 1, partly in section, of a second embodiment of a chamfering machine according to the invention.
FIG. 3 is a partial front view of the second embodiment.
The embodiments shown in FIGS. 1, 2 and 3 comprise identical components designated by the same reference characters.
With reference to the drawings, the chamfering machine according to one embodiment of the invention comprises a body having two parallel lateral walls 1.
The two wall elements 1 are interconnected by a brace 2 (see FIG. 2) in which are mounted two spaced-apar
REFERENCES:
patent: 3212541 (1965-10-01), Burrows et al.
patent: 3517712 (1970-06-01), Selowitz
patent: 3893372 (1975-07-01), Strakeljahn
patent: 4417835 (1983-11-01), Lund
patent: 4674548 (1987-06-01), Mills et al.
patent: 4977938 (1990-12-01), Greeson
Howell Daniel W.
Smolowitz Martin
Societe Nationale Industrielle et Aerospatiale
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