US3718975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perspective drafting machine
Assignee: Individual
•
Filing: 1971-07-02
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Granted: 1973-03-06
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Expires: 1991-07-02
Abstract
Abstract A perspective drafting machine which can be set at any position on a drawing board and adjusted to any selected horizon line. The straight edge or scale is carried on a travelling head which moves along an arcuate guide beam, the radius of the arc being easily adjustable to provide the required vanishing point in the perspective. Means is provided on the scale for setting the radius quickly and accurately. The arcuate guide beam is mounted on a carriage which moves along a track, and the entire beam, head and scale assembly can be swung to either side of the track to provide vanishing points toward opposite sides of the board, without losing any settings.
Inventors
- 👤 C Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:10
CPC Classifications
B; B43; B43L; B43L13/00; B43L13/14; B43L13/141
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
A perspective drafting machine, comprising: a rigid elongated rail having means for attachment to an edge of a drawing board; an elongated guide track attached perpendicularly to said rail and being longitudinally adjustable thereon; a carriage slidably mounted in said guide track, with means for locking the carriage in a selected position; an arcuate beam hinged to said carriage to swing to either side of said guide track; a head unit mounted to move along said arcuate beam; an elongated scale attached to said head unit and having a drawing guide edge; and means on said carriage for varying the radius of said arcuate beam.
Claim 2
Dependent Claim
105 words
A perspective drafting machine, comprising: a rigid elongated rail having means for attachment to an edge of a drawing board; an elongated guide track attached perpendicularly to said rail and being longitudinally adjustable thereon; a carriage slidably mounted in said guide track, with means for locking the carriage in a selected position; an arcuate beam hinged to said carriage to swing to either side of said guide track; a head unit mounted to move along said arcuate beam; an elongated scale attached to said head unit and having a drawing guide edge; and means on said carriage for varying the radius of said arcuate beam.
Claim 3
Dependent Claim
105 words
A perspective drafting machine, comprising: a rigid elongated rail having means for attachment to an edge of a drawing board; an elongated guide track attached perpendicularly to said rail and being longitudinally adjustable thereon; a carriage slidably mounted in said guide track, with means for locking the carriage in a selected position; an arcuate beam hinged to said carriage to swing to either side of said guide track; a head unit mounted to move along said arcuate beam; an elongated scale attached to said head unit and having a drawing guide edge; and means on said carriage for varying the radius of said arcuate beam.
Claim 4
Dependent Claim
105 words
A perspective drafting machine, comprising: a rigid elongated rail having means for attachment to an edge of a drawing board; an elongated guide track attached perpendicularly to said rail and being longitudinally adjustable thereon; a carriage slidably mounted in said guide track, with means for locking the carriage in a selected position; an arcuate beam hinged to said carriage to swing to either side of said guide track; a head unit mounted to move along said arcuate beam; an elongated scale attached to said head unit and having a drawing guide edge; and means on said carriage for varying the radius of said arcuate beam.
Claim 5
Dependent Claim
51 words
A perspective drafting machine according to claim 1, wherein said last mentioned means includes a turnbuckle having oppositely threaded end portions at opposite ends of said carriage, and a nut block on each of said threaded end portions, said arcuate beam being pivotally attached to and extending between said nut blocks.
Claim 6
Dependent Claim
48 words
A perspective drafting machine according to claim 2, wherein said arcuate beam is pivotal with said turnbuckle, to swing to positions on either side of said guide track, and detent means on said carriage for holding said beam substantially parallel to the drawing board surface in either position.
Claim 7
Dependent Claim
37 words
A perspective drafting machine according to claim 3, wherein said head unit has a roller means engaging and rolling on said arcuate beam, and clamp means for clamping the head unit at selected positions along said beam.
Claim 8
Dependent Claim
44 words
A perspective drafting machine according to claim 4, wherein said roller means comprises pairs of rollers straddling said arcuate beam, each pair of rollers having a mounting cage pivotally mounted in said head unit to adjust to changes in radius of said arcuate beam.
Claim 9
Dependent Claim
53 words
A perspective drafting machine according to claim 1 wherein said head unit has a shoe pivotally attached thereto to depend from the head unit on either side of said guide track, said scale being secured to the lower portion of said shoe, with said drawing guide edge substantially radial to said arcuate beam.
Claim 10
Dependent Claim
36 words
A perspective drafting machine according to claim 6, wherein said scale has a longitudinal raised rib, said shoe having clamp bar portions stradDling and engaging said rib, and releasable clamp means interconnecting said clamp bar portions.
Claim 11
Dependent Claim
25 words
A perspective drafting machine according to claim 7, and including setting means on said scale for indicating the radius of curvature of said arcuate beam.
References Cited (Backward Citations)
AT33255B
Cited
US3343267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |