CA2090446A1 - Drawing aid - Google Patents
Drawing aidInfo
- Publication number
- CA2090446A1 CA2090446A1 CA002090446A CA2090446A CA2090446A1 CA 2090446 A1 CA2090446 A1 CA 2090446A1 CA 002090446 A CA002090446 A CA 002090446A CA 2090446 A CA2090446 A CA 2090446A CA 2090446 A1 CA2090446 A1 CA 2090446A1
- Authority
- CA
- Canada
- Prior art keywords
- screen
- edge
- front surface
- light
- eye piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
- B43L13/14—Devices for drawing in perspective
- B43L13/16—Devices for drawing in perspective free-hand
- B43L13/18—Devices for drawing in perspective free-hand having optical or projecting equipment
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B11/00—Teaching hand-writing, shorthand, drawing, or painting
Abstract
ABSTRACT
The apparatus assists a person in drawing a three-dimensional object on a flat translucent material such as paper. The apparatus consists of a transparent flatplastic screen within an adjustable upright frame. An adjustable sighting devicewith an eyepiece projects from one edge of the frame. A three dimensional object is placed beyond the transparent screen so that it can be viewed through the eyepiece and screen. The sighting device stabilizes the artist's viewing position and facilitates the tracing of the object upon the plastic screen with a light-coloured or white wax crayon. A sheet of paper or other translucent material is then placed over the drawing on the plastic screen. A light source is directed into one edge of the plastic screen thus making the white wax drawing lines visible through the paper or other translucent material. Following the illuminated lines the artist can now trace upon his paper with a pencil, pen or other means and thus transfer to his paper or other translucent material an accurate two-dimensional rendering of the observed three-dimensional object.
The apparatus assists a person in drawing a three-dimensional object on a flat translucent material such as paper. The apparatus consists of a transparent flatplastic screen within an adjustable upright frame. An adjustable sighting devicewith an eyepiece projects from one edge of the frame. A three dimensional object is placed beyond the transparent screen so that it can be viewed through the eyepiece and screen. The sighting device stabilizes the artist's viewing position and facilitates the tracing of the object upon the plastic screen with a light-coloured or white wax crayon. A sheet of paper or other translucent material is then placed over the drawing on the plastic screen. A light source is directed into one edge of the plastic screen thus making the white wax drawing lines visible through the paper or other translucent material. Following the illuminated lines the artist can now trace upon his paper with a pencil, pen or other means and thus transfer to his paper or other translucent material an accurate two-dimensional rendering of the observed three-dimensional object.
Description
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DRAWING AID
BACKGROUND OF THE INVENTIQN
This invention relates to an appar~tus for assisting a person in drawing a three dimensional object.
Many studen~s have difficulty in drawing a three dimensional object in the sense that they cannot translate the different surfaces of the object visible in the three dimensional form into a two dimensional representation of ~hose surfaces. This tends to occur because ~he student moves the point of reference for the object that is the position of the eye around the object while attamptiny to illustrate the object so that the object tends to be illustrated from a number of different positions. While this may be artistic, it does not lead to a realisticrepresentation of the object being observed.
SUMMARY OF THE INVENTION
It is one object of the present invention, therefore, to provide an improved device for use in assisting a person in the illustration of a three dimensional object.
According to a first aspect of the inven~ion there is provided a method for assisting drawing of a three dimensional object comprisin~ viewing the object through a substantially transparent ~lat plastic screen having a front , ~ -surface, a rear surface and at least one edge, supporting the screen such that the object can be viewed therethrough from the front surface through the rear 2C~ surface with the object behind the rear surface, marking on the front surface of the screen using a marker to form lines on the front surface tracing an outline of the object as viewed, placing a transiucent material on the front surface of thescreen to cover said marked lines, supplying light through said edge of the screen, the marker having the said charac~eristic that when the screen is ~5' illuminated by light supplied through said edge the marked lines formed by the marker are illuminated by causing extraction of light through the front surface of the screen at the lines and ~racing ~he illuminated marked lines onto the translucent sheet.
, According to the second aspect of the invention there is provided, therefore an apparatus for assisting drawing of a three dimensional object comprising a substantially transparent flat plastic screen having a front suflace, a - rear surface and at least one edge, means for mounting tlle screen for viewing s the object through the screen and means for supplying light through s~id edge of the screen for illuminating marked lines applied to the front surface of the screen.
According to a third aspect o~ the invention there is provided an apparatus for drawing comprising a substantially transparent flat plastic screenhaving a front surface, a rear surface and at least one edge, and means for supplying light through said edge of the screen for illuminating marked lines applied to the front surface of the screen, ~he source of light comprising an elongate lens member extending substantially along the full length of the edge and arranged to concentrate light from an ambient source into the edge and means mounting the lens member for movement relative to the edge for 15 directional control of the illumination from the ambient source.
One or rnore embodiments of the invention will now be described in conjunction with the accompanying drawings.
BRLEF DESCRIPTION OFTHE DRAWiNGS ; :-Figure 1 is an isometric view of a first embodiment of the invention.
~ Figure 2 is an exploded view of the embodiment of Figure 1.
Figure 3 is an exploded view of the first portion of the second embodiment according to the present invention.
Figure 4 is an isomel:ric view of an easel portion for supporting the screen portion of Figure 3.
Figure 5 is a view along one edge of the screen showing on an enlarged scale the edge of the screen and a lens arrangement.
In the drawings like characters of reference indicate corresponding parts in the different figures.
DETAILED DESCRlPTiON
DRAWING AID
BACKGROUND OF THE INVENTIQN
This invention relates to an appar~tus for assisting a person in drawing a three dimensional object.
Many studen~s have difficulty in drawing a three dimensional object in the sense that they cannot translate the different surfaces of the object visible in the three dimensional form into a two dimensional representation of ~hose surfaces. This tends to occur because ~he student moves the point of reference for the object that is the position of the eye around the object while attamptiny to illustrate the object so that the object tends to be illustrated from a number of different positions. While this may be artistic, it does not lead to a realisticrepresentation of the object being observed.
SUMMARY OF THE INVENTION
It is one object of the present invention, therefore, to provide an improved device for use in assisting a person in the illustration of a three dimensional object.
According to a first aspect of the inven~ion there is provided a method for assisting drawing of a three dimensional object comprisin~ viewing the object through a substantially transparent ~lat plastic screen having a front , ~ -surface, a rear surface and at least one edge, supporting the screen such that the object can be viewed therethrough from the front surface through the rear 2C~ surface with the object behind the rear surface, marking on the front surface of the screen using a marker to form lines on the front surface tracing an outline of the object as viewed, placing a transiucent material on the front surface of thescreen to cover said marked lines, supplying light through said edge of the screen, the marker having the said charac~eristic that when the screen is ~5' illuminated by light supplied through said edge the marked lines formed by the marker are illuminated by causing extraction of light through the front surface of the screen at the lines and ~racing ~he illuminated marked lines onto the translucent sheet.
, According to the second aspect of the invention there is provided, therefore an apparatus for assisting drawing of a three dimensional object comprising a substantially transparent flat plastic screen having a front suflace, a - rear surface and at least one edge, means for mounting tlle screen for viewing s the object through the screen and means for supplying light through s~id edge of the screen for illuminating marked lines applied to the front surface of the screen.
According to a third aspect o~ the invention there is provided an apparatus for drawing comprising a substantially transparent flat plastic screenhaving a front surface, a rear surface and at least one edge, and means for supplying light through said edge of the screen for illuminating marked lines applied to the front surface of the screen, ~he source of light comprising an elongate lens member extending substantially along the full length of the edge and arranged to concentrate light from an ambient source into the edge and means mounting the lens member for movement relative to the edge for 15 directional control of the illumination from the ambient source.
One or rnore embodiments of the invention will now be described in conjunction with the accompanying drawings.
BRLEF DESCRIPTION OFTHE DRAWiNGS ; :-Figure 1 is an isometric view of a first embodiment of the invention.
~ Figure 2 is an exploded view of the embodiment of Figure 1.
Figure 3 is an exploded view of the first portion of the second embodiment according to the present invention.
Figure 4 is an isomel:ric view of an easel portion for supporting the screen portion of Figure 3.
Figure 5 is a view along one edge of the screen showing on an enlarged scale the edge of the screen and a lens arrangement.
In the drawings like characters of reference indicate corresponding parts in the different figures.
DETAILED DESCRlPTiON
3 A first embodiment is shown in Figures 1 and 2 and comprises a screen por~ion 10, a mounting stand 1 1 and an eye piece 12.
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The screen portion comprises a thin flat plastic screen 13 having a front face 14 and a rear face 15. The screen is rectangular with a lower most edge 16. The screen is mounted in a surrounding Frame element 17 formed of a suitable plastic material so the screen is maintained and held wi~hin the frame by clamping two portions of the frame together by screws 18. At a lower part of theframe is provided an elongate light bulb 19 supplied with power from an electrical connection 20. The screen can thus be illuminated by the supply of light from the light bulb 19 in~o the lower edge 16 of the screen with that light being transmitted internaily of the screen to exit at the other three edges of the screen unless the IO light is caused to escape through one of the surfaces of the screen.
The frame is a generally rectangular frame which has a width sufficient to receive and clamp the edges of the screen and is of increased width at the iower part parallel to the lowermost edge 16 to receive the bulb 19 and asuitable electrical connection.
Th~ mounting bracket 11 comprises a pair of triangular molJnting alement 21 and 22. Eaoh of the moun~ing elements is generally planar with a flatbase portion ~3 which can lie in contact with a mounting surface for exarnple the surface of a desk on which the device is to be used. A central portion of the base 23 is increased in height as indicated at 24 and is provided with a central2~) opening 25 which receives a captive screw ~6 mounted in a side edge of tha frame adjacent a bottom edge of the frame. The screw thus projects outwardly from the side edge and engages through the opening 25 and can be held in place by a nut 26A. Thus the screws 26 provide a pivot action of the frame and screen portion relative to the side frame elements abou~ an axis defined by the 25 screws 26. The axis is thus horizontal and positioned adjacent the bottom edge of the screen portion. The angle of the screen portion can thus be adjusted froma subs~antially vertical position ~orwardly or rearwardly o~ the vertical position and generally slightly rearwardly so that the screen can be positioned at an angle generally at right angles to the line of sight of the user when viewing an object - 3D through the screen.
The screen portion can be locked at the requirsd angle by engagement of a pin ~7 with an apex por~ion 28 of the side mounting element.
,- . .~, - , .. ;,, ; ,.
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2 ~ 9 0 ~ 4 ~3 Each mounting element therefore includes an upstanding portion converging from the ends of the base portion 23 upwardly toward the apex 28. At the apex is provided a plurality of openings 29 each of which can receive the pin 27 which engages into a suitable opening in the side of the frame of the screen portion to locate the screen portion at the required angle.
Alternative forms of clamping arrangement for locating the angle of the frame of ~he screen portion can be provide~ including frictional arrangements or the provision of a spring pin element mounted on the apex por~ion and cooperable with an apertured plate attached to the frame.
The eye piece 12 comprises an elongate arm 30 and an apsrture portion 31 which extends generally at right angles to the arm 30. The eye piece is smoothly curved to provide an attractive appearance. The aperture member 31 comprises a flat disc having a front surface for engaging the eye area of theuser. A centrai aperture 3~ is provided in the disc so that the user can bring the l~ eye up to the eye piece at the disc, place the eye gently against the disc and then view through ths aperture thus maintaining the eye fixed at a particular location relative to the screen.
The aperture member can be adjusted in position relative to the screen by movement of the arm 30 relative to a mounting member 33 provided on the side of the frame. The frame thus includes a recess 34 within which the rnounting member is located and is carried upon a screw 3~ attached to the frame at the recess. The mounting member is indicated at 36 and comprises a disc shaped body formed in two portions and defining a slot 37 therethrough within which the arm 30 can be mounted for sliding movement longitudinally of lS the arm. The disc member includes a central opening 38 applied onto the screw35 to be held in place by a nut 39. Tightening of the nut 3g thus clamps the twodisc portions together and holds the arm at a fixed position within the slot 37.The nut can be slightly released to allow twisting o~ the disG about the axis of the screw 35 and/or sliding movement of the arm within the slot. In this way the 3 position of the aperture member 31 can be adjusted to substantially any pvsition across the area of the screen and to a selected distance from the screen.
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~o~
In operation, the screen is located so that the object O to be drawn can be viewed through the screen with the screen maintained at an angle substantialiy at right angles to the line of sight. In cases where the object is large and positioned some distance from the screen, the screen will normally be s located vertically so that the person can view the whole of the object through the screen ~n cases where the object is relatively smalll the screen may be inclinedrearwardly toward the object so that the relatively srnall s~bject can be placedupon the support surface behind the screen. The eye piece is then adjusted so that the user can comfortably view the object through ~he eye piece whila reaching the screen with the hands of the user.
With the eye of the user thus located at a relatively fixed position by the aperture member, the user views the obiect O and traces the outline of the object on the screen using a light colored wax marker pen ~ Preferably the marker pen selected is of a white colour so that when ths lines L are applied to15 the screen they are easily visible against the often multi-tonal subject and background. The lines L thus marked provide on the screen an illustration of theobject as it is viewed in a two dimensional format. The fact that the eye of theuser is maintained at a fixed position makes the illustration relative!y simple and causes the user to mark lines L exactly tracing the object O as viewed.
~o When the marking of the ou~line is complete, the user places a piece of paper S or other translucent marking material onto the screen on the front surface of the screen and generaily o~ a size approximating to the size ofthe screen. The paper can be 16 or 20 Ib. standard weight paper. The pale or white markings on the screen are generally not visible through the translucent ~5 material except in the presence of the edge illumination. At this time the illumination provided by the light bulb is con$inued so that the screen is illuminated through the edge 16. The illumination of the screen in combination with the wax material of the marker causes the lines marked on the screen to be illuminated sharply in contrast to the dull or non illuminated other parts of the 3~ screen. This edge illumination ~s itself a known technique and the alteration of the surface characteristics of the screen causes the light to be emitted a~ the marked lines. The marked lines are thus readily visible through the translucent 2~9~
material allowing the marked lines to be traced onto the paper or other translucent material thus transferring the iliustration onto ~he paper.
When the transfer by the tracing process is complete, the paper can be removed and the outline of the object used to more artistically illustrate the s object by the application of shading, coloring or the like.
The device can be used without the eye piece in some cases where the user is sufficiently skilled to maintain the eye position substantially stationary.
Turning now to Figure 3, 4 and 5, a second embodiment is shown including a screen portion 40, a mounting assembly ~1, an eye piece 42. In this embodiment the screen portion 40 cornprises simply a flat plastics sheet 43 to which is attached a surrounding frame 44 on the front face of the sheet so that the edges of the sheet are exposed. The front frame element 44 simply provides a surrounding area to delimit the screen. In this embodiment there is no electrically illuminated light source similar to the bulb of the first embodiment but 15 instead it is replaced by a lens member 4~ attached at the upper edge of the sheet 43. The lens member comprises ~n elongate cylindrical rod having a length substantially equal to the length of the upper edge of the screen with the rod being held in plaee at the edge by a flexible band 46 engaged around the rodand passing through holes 47 in the screen and in the surrounding frame. The 20 rod 45 can thus be moved forwardly and raarwardly relative to the edge 48 of the screen. The rod acts as a lens member to concentrate light From a greater area and to direct that light into the edge of the sheet so as to edge illuminate thesheet in the manner previously described. Depending upon the positioning of the ambient source such as a window, overhead lighting or ~he like, the rod will be 2~ positioned to focus that light into the edge parallel to the screen.
As the amount of edge illumination obtained from the ambient source is significantly less than that obtainable using an electrically light powered source, in this embodiment there is provided a shade member 49 which is opaque and ~hus prevents ambient light from striking the front surface of the screen. The shade member comprises a flat base at right angles to the pla~e of the shade and a second leg extending from an edge of the base back toward the main body of ~he shade. The shade is held in piace by an elastic band ~1 .
attached to the sides of the screen and extending through the hollow interior ofthe triangular section 50. The band has sufficient tension to hold the shade in position as shown extending outwardly at right angles to the screen when the base is positioned against the front surface o~ the frame. In addition the shade5 can be turned substantially at right angles so that the band engages the inclined portion of the triangular section so the shade is folded down flat against the front face of the screen.
The eye piece 42 includes the arm 52 which can be positioned at a required location relative to the front surface of the screen by insertion through 1 the mounting bracket 53 on an upper side of the shade. The mounting bracket defines a slot 54 into which the arm can be inserted as a sliding fit.
The easel member comprises a front wall 55 and a rear wall 56 converging toward an apex portion 57. In conventional manner these portions can be folded inwardly to form a flat body or can be folded outwardly to a position '5 as shown and held in the angle position by a transverse brace 58. At the base of the front panel 55 is provided a ledge portion 60 de~ining a slot onto which theedge of the screen can be mounted so that the screen lies against the front panel. The front panel carries a dark sheet 61 over the majority of the area so as to provide a darkened area behind the screen when the screen is in position 20 mounted on the ledge 60. This prevents viewing through the screen and provides a dark background for easier observation of the illumina~ed markings provided by the tracing effect previously described.
The apex 57 includes a further slot 63 again shaped to receive the ~dge of the screen so that the screen can be located at that position supported 25 above tha easel member for the first step of the process that is ~he observing of the object and the marking of the screen with the marked lines corresponding to the object.
As an alternative position on the easel member, the screen can be positioned at one end of the lower slot defined by the ledge 60 so that the screen 30 projects outwardly from one side of the easel member.
The method of use of the second embodiment is substantially the : .
same as that previously described except that during the tracing process using the translucent material or paper, the screen is positioned over the dark area to .
make the tracing of the illuminated markings more readily visible.
S Since various modifications can be made in my invention as : .: 1 i , ., hereinabove described, and many apparently widely different embodimen~s of same made within the spirit and scope of the claims without departing ~rom such spirit and scope, it is intended that all rnatter contained in the accompanying , specification shall be in~erpreted as il!ustrative only and not in a limiting sense.
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The screen portion comprises a thin flat plastic screen 13 having a front face 14 and a rear face 15. The screen is rectangular with a lower most edge 16. The screen is mounted in a surrounding Frame element 17 formed of a suitable plastic material so the screen is maintained and held wi~hin the frame by clamping two portions of the frame together by screws 18. At a lower part of theframe is provided an elongate light bulb 19 supplied with power from an electrical connection 20. The screen can thus be illuminated by the supply of light from the light bulb 19 in~o the lower edge 16 of the screen with that light being transmitted internaily of the screen to exit at the other three edges of the screen unless the IO light is caused to escape through one of the surfaces of the screen.
The frame is a generally rectangular frame which has a width sufficient to receive and clamp the edges of the screen and is of increased width at the iower part parallel to the lowermost edge 16 to receive the bulb 19 and asuitable electrical connection.
Th~ mounting bracket 11 comprises a pair of triangular molJnting alement 21 and 22. Eaoh of the moun~ing elements is generally planar with a flatbase portion ~3 which can lie in contact with a mounting surface for exarnple the surface of a desk on which the device is to be used. A central portion of the base 23 is increased in height as indicated at 24 and is provided with a central2~) opening 25 which receives a captive screw ~6 mounted in a side edge of tha frame adjacent a bottom edge of the frame. The screw thus projects outwardly from the side edge and engages through the opening 25 and can be held in place by a nut 26A. Thus the screws 26 provide a pivot action of the frame and screen portion relative to the side frame elements abou~ an axis defined by the 25 screws 26. The axis is thus horizontal and positioned adjacent the bottom edge of the screen portion. The angle of the screen portion can thus be adjusted froma subs~antially vertical position ~orwardly or rearwardly o~ the vertical position and generally slightly rearwardly so that the screen can be positioned at an angle generally at right angles to the line of sight of the user when viewing an object - 3D through the screen.
The screen portion can be locked at the requirsd angle by engagement of a pin ~7 with an apex por~ion 28 of the side mounting element.
,- . .~, - , .. ;,, ; ,.
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2 ~ 9 0 ~ 4 ~3 Each mounting element therefore includes an upstanding portion converging from the ends of the base portion 23 upwardly toward the apex 28. At the apex is provided a plurality of openings 29 each of which can receive the pin 27 which engages into a suitable opening in the side of the frame of the screen portion to locate the screen portion at the required angle.
Alternative forms of clamping arrangement for locating the angle of the frame of ~he screen portion can be provide~ including frictional arrangements or the provision of a spring pin element mounted on the apex por~ion and cooperable with an apertured plate attached to the frame.
The eye piece 12 comprises an elongate arm 30 and an apsrture portion 31 which extends generally at right angles to the arm 30. The eye piece is smoothly curved to provide an attractive appearance. The aperture member 31 comprises a flat disc having a front surface for engaging the eye area of theuser. A centrai aperture 3~ is provided in the disc so that the user can bring the l~ eye up to the eye piece at the disc, place the eye gently against the disc and then view through ths aperture thus maintaining the eye fixed at a particular location relative to the screen.
The aperture member can be adjusted in position relative to the screen by movement of the arm 30 relative to a mounting member 33 provided on the side of the frame. The frame thus includes a recess 34 within which the rnounting member is located and is carried upon a screw 3~ attached to the frame at the recess. The mounting member is indicated at 36 and comprises a disc shaped body formed in two portions and defining a slot 37 therethrough within which the arm 30 can be mounted for sliding movement longitudinally of lS the arm. The disc member includes a central opening 38 applied onto the screw35 to be held in place by a nut 39. Tightening of the nut 3g thus clamps the twodisc portions together and holds the arm at a fixed position within the slot 37.The nut can be slightly released to allow twisting o~ the disG about the axis of the screw 35 and/or sliding movement of the arm within the slot. In this way the 3 position of the aperture member 31 can be adjusted to substantially any pvsition across the area of the screen and to a selected distance from the screen.
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~o~
In operation, the screen is located so that the object O to be drawn can be viewed through the screen with the screen maintained at an angle substantialiy at right angles to the line of sight. In cases where the object is large and positioned some distance from the screen, the screen will normally be s located vertically so that the person can view the whole of the object through the screen ~n cases where the object is relatively smalll the screen may be inclinedrearwardly toward the object so that the relatively srnall s~bject can be placedupon the support surface behind the screen. The eye piece is then adjusted so that the user can comfortably view the object through ~he eye piece whila reaching the screen with the hands of the user.
With the eye of the user thus located at a relatively fixed position by the aperture member, the user views the obiect O and traces the outline of the object on the screen using a light colored wax marker pen ~ Preferably the marker pen selected is of a white colour so that when ths lines L are applied to15 the screen they are easily visible against the often multi-tonal subject and background. The lines L thus marked provide on the screen an illustration of theobject as it is viewed in a two dimensional format. The fact that the eye of theuser is maintained at a fixed position makes the illustration relative!y simple and causes the user to mark lines L exactly tracing the object O as viewed.
~o When the marking of the ou~line is complete, the user places a piece of paper S or other translucent marking material onto the screen on the front surface of the screen and generaily o~ a size approximating to the size ofthe screen. The paper can be 16 or 20 Ib. standard weight paper. The pale or white markings on the screen are generally not visible through the translucent ~5 material except in the presence of the edge illumination. At this time the illumination provided by the light bulb is con$inued so that the screen is illuminated through the edge 16. The illumination of the screen in combination with the wax material of the marker causes the lines marked on the screen to be illuminated sharply in contrast to the dull or non illuminated other parts of the 3~ screen. This edge illumination ~s itself a known technique and the alteration of the surface characteristics of the screen causes the light to be emitted a~ the marked lines. The marked lines are thus readily visible through the translucent 2~9~
material allowing the marked lines to be traced onto the paper or other translucent material thus transferring the iliustration onto ~he paper.
When the transfer by the tracing process is complete, the paper can be removed and the outline of the object used to more artistically illustrate the s object by the application of shading, coloring or the like.
The device can be used without the eye piece in some cases where the user is sufficiently skilled to maintain the eye position substantially stationary.
Turning now to Figure 3, 4 and 5, a second embodiment is shown including a screen portion 40, a mounting assembly ~1, an eye piece 42. In this embodiment the screen portion 40 cornprises simply a flat plastics sheet 43 to which is attached a surrounding frame 44 on the front face of the sheet so that the edges of the sheet are exposed. The front frame element 44 simply provides a surrounding area to delimit the screen. In this embodiment there is no electrically illuminated light source similar to the bulb of the first embodiment but 15 instead it is replaced by a lens member 4~ attached at the upper edge of the sheet 43. The lens member comprises ~n elongate cylindrical rod having a length substantially equal to the length of the upper edge of the screen with the rod being held in plaee at the edge by a flexible band 46 engaged around the rodand passing through holes 47 in the screen and in the surrounding frame. The 20 rod 45 can thus be moved forwardly and raarwardly relative to the edge 48 of the screen. The rod acts as a lens member to concentrate light From a greater area and to direct that light into the edge of the sheet so as to edge illuminate thesheet in the manner previously described. Depending upon the positioning of the ambient source such as a window, overhead lighting or ~he like, the rod will be 2~ positioned to focus that light into the edge parallel to the screen.
As the amount of edge illumination obtained from the ambient source is significantly less than that obtainable using an electrically light powered source, in this embodiment there is provided a shade member 49 which is opaque and ~hus prevents ambient light from striking the front surface of the screen. The shade member comprises a flat base at right angles to the pla~e of the shade and a second leg extending from an edge of the base back toward the main body of ~he shade. The shade is held in piace by an elastic band ~1 .
attached to the sides of the screen and extending through the hollow interior ofthe triangular section 50. The band has sufficient tension to hold the shade in position as shown extending outwardly at right angles to the screen when the base is positioned against the front surface o~ the frame. In addition the shade5 can be turned substantially at right angles so that the band engages the inclined portion of the triangular section so the shade is folded down flat against the front face of the screen.
The eye piece 42 includes the arm 52 which can be positioned at a required location relative to the front surface of the screen by insertion through 1 the mounting bracket 53 on an upper side of the shade. The mounting bracket defines a slot 54 into which the arm can be inserted as a sliding fit.
The easel member comprises a front wall 55 and a rear wall 56 converging toward an apex portion 57. In conventional manner these portions can be folded inwardly to form a flat body or can be folded outwardly to a position '5 as shown and held in the angle position by a transverse brace 58. At the base of the front panel 55 is provided a ledge portion 60 de~ining a slot onto which theedge of the screen can be mounted so that the screen lies against the front panel. The front panel carries a dark sheet 61 over the majority of the area so as to provide a darkened area behind the screen when the screen is in position 20 mounted on the ledge 60. This prevents viewing through the screen and provides a dark background for easier observation of the illumina~ed markings provided by the tracing effect previously described.
The apex 57 includes a further slot 63 again shaped to receive the ~dge of the screen so that the screen can be located at that position supported 25 above tha easel member for the first step of the process that is ~he observing of the object and the marking of the screen with the marked lines corresponding to the object.
As an alternative position on the easel member, the screen can be positioned at one end of the lower slot defined by the ledge 60 so that the screen 30 projects outwardly from one side of the easel member.
The method of use of the second embodiment is substantially the : .
same as that previously described except that during the tracing process using the translucent material or paper, the screen is positioned over the dark area to .
make the tracing of the illuminated markings more readily visible.
S Since various modifications can be made in my invention as : .: 1 i , ., hereinabove described, and many apparently widely different embodimen~s of same made within the spirit and scope of the claims without departing ~rom such spirit and scope, it is intended that all rnatter contained in the accompanying , specification shall be in~erpreted as il!ustrative only and not in a limiting sense.
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Claims (14)
1. A method for assisting drawing on a translucent sheet material of a three dimensional object comprising viewing the object through a substantially transparent flat plastic screen having a front surface, a rear surface and at least one edge, supporting the screen such that the object can be viewed therethrough from the front surface through the rear surface with the object behind the rear surface, marking on the front surface of the screen using a marker to form lines on the front surface tracing an outline of the object as viewed, placing the translucent material on the front surface of the screen to cover said marked lines, supplying light through said edge of the screen, the marker having the characteristic that when the screen is illuminated by light supplied through said edge the marked lines formed by the marker are illuminated by causing extaction of light through the front surface of the screen at the lines and tracing the illuminated marked lines onto the translucent sheet.
2. The method according to Claim 1 wherein the step of viewing the object further includes viewing the object through a stationary eye piece mounted forwardly of the front surface of the screen, the eye piece being adjustable in position relative to the front surface.
3. The method according to Claim 2 wherein the eye piece comprises a surface arranged to be brought to a position adjacent the eye and a hole through the surface through which the object can be observed.
4. The method according to Claim 2 wherein the eye piece is mounted upon an arm connected to the screen and movable relative to the screen.
5. The method according to Claim 1 wherein the marker comprises a wax marker of a pale colour allowing viewing of the object beyond the marked lines and through the screen.
6. The method according to Claim 1 wherein during the step of illuminating the screen there is provided a darkened area behind the rear surface of the screen during the illumination and tracing of the marked lines.
7. The method according to Claim 1 wherein the step of supplying light through an edge of the screen includes providing a source of light at said edge of said screen arranged to direct light into the edge.
8. The method according to Claim 7 wherein the source of light comprises an elongate cylindical lens member extending substantially along the full length of the edge and arranged to concentrate light from ambient light into the edge and the lens member is mounted immediately adjacent the edge for movement transversely of the screen relative to the edge for directional control of the illumination from the ambient light.
9. Apparatus for assisting drawing of a three dimensional object comprising a substantially transparent flat plastic screen having a front surface, a rear surface and at least one edge, means for mounting the screen for viewing ofthe object through the screen, means for supplying light through said edge of the screen for illuminating marked lines applied to the front surface of the screen,and a stationary eye piece mounted forwardly of the front surface of the screen,the eye piece being adjustable in position relative to the front surface, the eye piece comprising a surface arranged to be brought to a position adjacent the eyeand a hole through the surface through which the object can be observed, and the eye piece being mounted upon an arm connected to the screen and movable relative to the screen.
10. The apparatus according to Claim 9 wherein the eye piece comprises a surface arranged to be brought to a position adjacent the eye and a hole through the surface through which the object can be observed.
11. The apparatus according to Claim 9 wherein the eye piece is mounted upon an arm connected to the screen and movable relative to the screen.
12. The apparatus according to Claim 9 including a marker comprising a wax marker of a pale colour allowing viewing of the object beyond the marked lines and through the screen.
13. The apparatus according to Claim 9 including a dark covering for the rear surface of the screen.
14. The apparatus according to Claim 9 wherein the means for supplying light comprises an elongate cylindrical lens member extending substantially along the full length of the edge and arranged to concentrate light from ambient light into the edge and means mounting the lens member immediately adjacent the edge for movement transversely of the screen relative to the edge for directional control of the illumination from the ambient source.15. Apparatus for assisting drawing of a three dimensional object comprising a substantially transparent flat plastic screen having a Front surface, a rear surface and at least one edge, means for mounting the screen for viewing ofthe object through the screen, means for supplying light through said edge of the screen for illuminating marked lines applied to the front surface of the screen and a shade member mounted relative to the screen so as to be movable from a folded position substantially flat against the screen to an outwardly projectingposition extending substantially at right angles to the screen so as to shade the front surface of the screen from ambient illumination.
16. The apparatus according to Claim 15 including an eye piece having an arm mounted on said shade member for adjustable movement relative thereto and an aperture portion mounted upon an end of the arm remote from the shade member for viewing of the object through the aperture member and through the screen.
17. The apparatus according to Claim 9 wherein the mounting means comprises an easel member defining a first position for receiving the screen mounted thereon and providing a dark opaque background for positioning adjacent the screen when in the first position and means for mounting the screenat the second position such that the screen is unobscured for viewing the object.
18. Apparatus for use in drawing comprising a substantially transparent flat plastic screen having a front surface, a rear surface and at least one edge, and means for supplying light through said edge of the screen for illuminating marked lines applied to the front surface of the screen, the source of light comprising an elongate cylindrical lens member extending substantially along the full length of the edge and arranged to concentrate light from ambientlight into the edge and means mounting the lens member immediately adjacent the edge for movement transversely of the screen relative to the edge for directional control of the illumination from the ambient light.
16. The apparatus according to Claim 15 including an eye piece having an arm mounted on said shade member for adjustable movement relative thereto and an aperture portion mounted upon an end of the arm remote from the shade member for viewing of the object through the aperture member and through the screen.
17. The apparatus according to Claim 9 wherein the mounting means comprises an easel member defining a first position for receiving the screen mounted thereon and providing a dark opaque background for positioning adjacent the screen when in the first position and means for mounting the screenat the second position such that the screen is unobscured for viewing the object.
18. Apparatus for use in drawing comprising a substantially transparent flat plastic screen having a front surface, a rear surface and at least one edge, and means for supplying light through said edge of the screen for illuminating marked lines applied to the front surface of the screen, the source of light comprising an elongate cylindrical lens member extending substantially along the full length of the edge and arranged to concentrate light from ambientlight into the edge and means mounting the lens member immediately adjacent the edge for movement transversely of the screen relative to the edge for directional control of the illumination from the ambient light.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/855,758 US5217376A (en) | 1992-03-20 | 1992-03-20 | Drawing aid |
| US07/855,758 | 1992-03-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2090446A1 true CA2090446A1 (en) | 1993-09-21 |
Family
ID=25321994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002090446A Abandoned CA2090446A1 (en) | 1992-03-20 | 1993-02-26 | Drawing aid |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5217376A (en) |
| CA (1) | CA2090446A1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD379371S (en) * | 1993-04-14 | 1997-05-20 | Drawing Directions, Inc. | Perspective drawing device |
| US5580250A (en) * | 1995-01-17 | 1996-12-03 | Mckewen; William | Drawing aid and method for drawing a scene in one place and recreating it in another |
| GB9614598D0 (en) * | 1996-07-11 | 1996-09-04 | Cobb James M E | Drawing apparatus |
| US5989033A (en) * | 1997-12-24 | 1999-11-23 | Burgio; Patricia | Book kit for a drawing game-fun sky |
| SE513925C2 (en) * | 1998-02-27 | 2000-11-27 | Bjoerk Monica Halvarsson | Easel |
| US7916124B1 (en) | 2001-06-20 | 2011-03-29 | Leapfrog Enterprises, Inc. | Interactive apparatus using print media |
| US7853193B2 (en) * | 2004-03-17 | 2010-12-14 | Leapfrog Enterprises, Inc. | Method and device for audibly instructing a user to interact with a function |
| US7831933B2 (en) | 2004-03-17 | 2010-11-09 | Leapfrog Enterprises, Inc. | Method and system for implementing a user interface for a device employing written graphical elements |
| US7922099B1 (en) | 2005-07-29 | 2011-04-12 | Leapfrog Enterprises, Inc. | System and method for associating content with an image bearing surface |
| US7936339B2 (en) * | 2005-11-01 | 2011-05-03 | Leapfrog Enterprises, Inc. | Method and system for invoking computer functionality by interaction with dynamically generated interface regions of a writing surface |
| US8599143B1 (en) | 2006-02-06 | 2013-12-03 | Leapfrog Enterprises, Inc. | Switch configuration for detecting writing pressure in a writing device |
| US8261967B1 (en) | 2006-07-19 | 2012-09-11 | Leapfrog Enterprises, Inc. | Techniques for interactively coupling electronic content with printed media |
| ES2337969B8 (en) * | 2007-07-20 | 2011-07-20 | Universidad De Granada | SPECULAR MODELING HORSE. |
| US20100129779A1 (en) * | 2008-11-22 | 2010-05-27 | Pomerleau Kevin L | Image Capture and Tracing System and Method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2420316A (en) * | 1947-05-13 | Perspective projector and enlarges | ||
| US1111608A (en) * | 1911-08-24 | 1914-09-22 | Walter Thomas Smith O'brien | Sketching apparatus. |
| US2257005A (en) * | 1940-04-01 | 1941-09-23 | Adolph F Grosse | Drawing board |
| US2571613A (en) * | 1946-07-08 | 1951-10-16 | Edwin E Rissland | Device for teaching perspective |
| US4340372A (en) * | 1980-04-17 | 1982-07-20 | Brassine Robert L | Educational aid |
| US4600393A (en) * | 1985-01-11 | 1986-07-15 | Marvin Glass & Associates | Portable self-contained light box drawing toy |
| US5100325A (en) * | 1990-12-10 | 1992-03-31 | Cutler Daniel S | Apparatus and method for creating perspective drawings |
-
1992
- 1992-03-20 US US07/855,758 patent/US5217376A/en not_active Expired - Fee Related
-
1993
- 1993-02-26 CA CA002090446A patent/CA2090446A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US5217376A (en) | 1993-06-08 |
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |