Geometrical instruments – Scriber – Curved line
Reexamination Certificate
2000-01-13
2001-08-21
Fulton, Christopher W. (Department: 2859)
Geometrical instruments
Scriber
Curved line
C033S030400
Reexamination Certificate
active
06276067
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an ellipse drawing/cutting device which is mainly made up of a base plate, a driving gear, a coil spring, a driven gear, a position retaining arm, a compression spring, a longitudinal measurement disc, a first fixing ring cover for the longitudinal measurement disc, a lateral measurement disc, a second fixing ring cover for the lateral measurement disc, a slide bracket assembly including a ruler frame, cover plates for the slide bracket assembly, a link bar, a plurality of anti-slip blocks disposed under the base plate, and a plurality of differently spaced pen insertion holes are distributed on the ruler frame which is relatively slidable on the lateral measurement disc. The longitudinal measurement disc and the lateral measurement disc are connected to each other by the link bar and movable in synchronism by way of the driven gear actuated by the spring operated driving gear so that a pen can be selectively inserted in a proper one of the insertion holes to draw ellipses of different dimensions within ranges defined by the sizes of the longitudinal and lateral measurement discs.
Traditionally, people draw ellipses by selection of proper ellipsographs of fixed sizes. Those plastic ellipsographs are produced by injection molding art and are fixed in their dimensions. So, to draw ellipses of various sizes, a person must choose different ellipsographs to meet the needs. It is very inconvenient because a plurality of ellipsographs must be ready at hand when different ellipses are to be drawn. Thus, it is time consuming in locating a proper ellipsograph every time and also not economical in cost for people to purchase a plurality of ellipsographs.
SUMMARY OF THE INVENTION
Therefore, the primary object of the present invention is to provide an ellipse drawing/cutting device, which can draw or cut ellipses of different dimensions in a simple and speedy manner. A number of replaceable ruler frames are selectively mounted to a lateral measurement disc of the base plate in accordance with practical requirements. Each ruler frame can be used to draw or cut ellipses of various dimensions with ease.
Another object of the present invention is to provide an ellipse drawing/cutting device, which is provided with a number of small-size replaceable ruler frames so that they are easy for storage and carrying and cheap to produce.
REFERENCES:
patent: 2623286 (1952-12-01), Barker
patent: 4563819 (1986-01-01), Ching et al.
patent: 4570344 (1986-02-01), Clegg
patent: 4624057 (1986-11-01), Hursey
Browdy and Neimark
Fulton Christopher W.
Welter's Co., Ltd.
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