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| Number | Title | Issue Date |
| 7373734 | Linear proportioner A linear proportioner including a logarithmic mechanism to be used for transferring linear dimensions from an existing drawing, picture or actual scene to a new drawing or artist medium. An elongated assembly provides two indicators (one fixed and one variable) as r... | 05/20/2008 |
| 7278217 | Trigonometric teaching aid A trigonometric teaching aid for providing students with real life applications for the principles of trigonometry includes a transit assembly having a sight tube with cross hairs, a level and an upper protractor pivotally connected to an upper end of a vertical sca... | 10/09/2007 |
| 7204028 | Perspective view drafting device A drafting device creating perspective views from horizontal base lines with remote horizontal vanishing points and with a remote skyline vanishing point. The drafting device includes articulated arm assemblies on opposite sides of the board. Each arm assembly inclu... | 04/17/2007 |
| 6751878 | APPARATUS AND METHOD FOR CREATING A DRAWING OF A THREE-DIMENSIONAL OBJECT MANUALLY AND /OR ELECTRONICALLY BY VIEWING THE OBJECT THROUGH A TRANSPARENT WINDOW PANE AND TRACING THE OBJECT ON THE TRANSPARENT WINDOW PANE A tracing an object has front and rear shells that are pivoted to each other to form a case. The rear shell defines a platform for supporting an object and the front defines a clear window pane forming a tracing plane through which the object is visible. A leg conne... | 06/22/2004 |
| 6487784 | Portable drawing board for art students A portable drawing board device adapted for helping art students to draw perspective drawings, includes: (a) a generally rectangular-shaped, flat drawing surface on an upper surface of the drawing board, the drawing surface being adapted for supporting a ... | 12/03/2002 |
| 5799402 | Portable device for removably positioning and resetting vanishing points of perspective drawings The invention relates to a portable and removable device for positioning and resetting a vanishing point of a perspective drawing which is to be construed on a support. The device comprises at least one stick of a given length and having opposite ends, on... | 09/01/1998 |
| 5718053 | Stationary perspective device An artist's drawing device for maintaining a constant three-dimensional perspective while rendering a subject or object. The drawing device includes a first visually-defined perimeter of a planar geometric figure having a first size, a second visually-def... | 02/17/1998 |
| 5673492 | Perspective drawing alignment apparatus The invention consists of a focused light beam source mounted on a straight-edge, which is aligned to an off-drawing vanishing point target reference, to sketch object lines in a manner which creates depth perspective and thus maintains the three-dimensio... | 10/07/1997 |
| 5632094 | Articulated drafting device for drawing perspectives A portable drafting device and learning tool for laying out perspective drawing lines to enhance the realism of standard 30 degree base line isometric drawings and other similar drawings with different base line angles. The device comprises a rectangular ... | 05/27/1997 |
| 5077904 | Drafting apparatus A drafting apparatus comprising a drawing board having at least two opposite, parallel sides, and arcuate guide means, detachably coupled to the at least two opposite, parallel sides, for guiding a straight edge along a radial path during formation of rad... | 01/07/1992 |
| 4918822 | Perspective drafting apparatus A perspective drafting device including a pair of straight edges pivotally connected to a centerpiece removably fixable to the horizontal arm of a drafting machine in place of the horizontal scale. Each of the straight edges is slidable through a vanishin... | 04/24/1990 |
| 4899454 | Perspective drawing machine A drafting table includes vertical and horizontal straight edged supports together with drive mechanisms for moving the vertical straight edge such that it will always point to a viewing point and for moving the horizontal straight edges in plural differe... | 02/13/1990 |
| 4823475 | Drafting device A drafting device (10) is provided for drawing parallel lines as well as true perspective lines, comprising carriage means (11) movable over a drafting surface (12) on wheel assembly means (20) and (21). A ruler (124) is located on carriage means (11) and... | 04/25/1989 |
| 4586265 | Perspective drawing apparatus A drafting apparatus having a linear edge with first and second wheel means associated with the edge to rotatably move the linear edge across a planar drafting surface and wherein the wheels are of differing diameter so as to have the linear edge move acr... | 05/06/1986 |
| 4565016 | Perspective drafting instrument A drafting instrument (14) is provided for drawing perspective lines without physically preestablishing and marking a vanishing point. A carriage (16) and drawing blade (18) are supported on roller means (20) for movement along a drawing surface. Control ... | 01/21/1986 |
| 4505041 | Perspective drawing templates A drafting template having printed thereon a pattern of non-concentric elliptical portions, preferably forming complete ellipses, a vertical measuring line extending upwardly from a common point for the pattern or from a base point for the vertical measur... | 03/19/1985 |
| 4453318 | Apparatus for producing perspective drawings An apparatus is provided for use in conjunction with a tiltable rectangular drafting table for producing perspective drawings within a working area centered on the table. The apparatus comprises a left side, right side and bottom holding means and an elon... | 06/12/1984 |
| 4403423 | Drafting instrument A drafting instrument is provided for making pictorial drawings, especially axonometric projections. The instrument is in the form of a template which is placed over the drafting surface and may be attached to a drafting machine, straight edge, T-square, ... | 09/13/1983 |
| 4360975 | Perspective drawing machine This invention relates to a perspective drawing machine and more particularly, to a machine which will keep track of a chosen vanishing point. Two machines are disclosed; one, a mechanical machine works to &#b1;22.5 degrees with an error of &#b1;4.7%. The... | 11/30/1982 |
| 4166321 | Orthographic to axonometric plotting apparatus Apparatus by which common points in any two conventional adjacent perpendicular orthographic views of an object are utilized to produce isometric, diametric or trimetric views of the object. One form of the apparatus comprises a main plotting member shape... | 09/04/1979 |
| 4166322 | Rulers for making axonometric projection drawings A ruler of transparent material having a first edge parallel to one of the three main projection axes of an axonometric projection drawing and a second edge at a specified angle γ with one of the remaining two main projection axes. The ruler is provided ... | 09/04/1979 |
| 4159571 | Geometrical instrument A device having two scales, one for vertical height and one for vanishing point distance, that permits perspective drawings to be made without the need for the actual plotting of the vanishing points; and that permits vanishing points of any distance apar... | 07/03/1979 |
| 4137635 | Standard parallel rule with perspective drawing device A standard draftsman's parallel bar or rule is adapted to draw perspective lines by an auxiliary cable and differential pulley system which when detached allows conventional parallel operation.... | 02/06/1979 |
| 4007542 | Straightedge A straightedge having incremental markings along two opposite edges, the spacing of the markings being progressively decreased toward a theoretical vanishing point to provide a perspective scale. The straightedge has a rigid spine, with two edge members o... | 02/15/1977 |
| 3945123 | Device for drawing objects in perspective A pre-calibrated or pre-scaled geometrical instrument having no moving parts which provides necessary indicia on the face of the device which allows a draftsman or the like to draw objects in perspective, the indicia information including the right and le... | 03/23/1976 |
