US3874309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Articulated column drafting table
Assignee: Individual
•
Filing: 1974-05-01
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Granted: 1975-04-01
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Expires: 1994-05-01
Abstract
Abstract An articulated column drafting table having a forwardly inclined hinged column rising from the apex of a V-shaped base with the spread of its arms to the front and a drawing board tiltingly mounted on the upper end of said articulated column characterized by an improved board tilting and column hinging mechanism that allows a wide angle range for hinging of the upper limb of the articulated column and for tilting of the drawing board on the free end of the upper limb. The hinging of the upper limb of the articulated column from upright to lowered position and the tilting of the board from vertical to horizontal position under the influence of separate and independent counterbalancing means, with individual tension adjustments, allows each to rest in a state of static equilibrium at any point in its turning angle range when in unlocked position. Both the hinging column limb and the tilting drawing board are releasably locked in securely fixed position on the actuation of a single locking device. The tilting drawing board and the column hinging limb are each turnable through a selected predetermined arc of approximately ninety degrees and have positive stops at both ends of the respective permitted turning arcs.
Inventors
- 👤 Gary Cowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:48
CPC Classifications
A; A47; A47B; A47B27/00; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32008; Y10T403/32081; Y10T403/32549; Y10T403/32557; Y10T403/32591
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
A drafting table having a forwardly inclined articulated column rising from the apex of a horizontal V-shaped base with the spread of its arms to the front and a drawing board tiltingly mounted on the top end of the column''s upper limb characterized by individual and independent counterbalance means for the upper limb of the articulated column and the tiltable drawing board on the top end thereof respectively; means to limit the arc through which the upper limb of the articulated column may hinge; separate means to limit the arc through which said drawing board may tilt; and a common locking device for releasably holding the hingeable limb and the tiltable drawing board in any desired position within their respective permitted turning arcs.
Claim 2
Dependent Claim
123 words
A drafting table having a forwardly inclined articulated column rising from the apex of a horizontal V-shaped base with the spread of its arms to the front and a drawing board tiltingly mounted on the top end of the column''s upper limb characterized by individual and independent counterbalance means for the upper limb of the articulated column and the tiltable drawing board on the top end thereof respectively; means to limit the arc through which the upper limb of the articulated column may hinge; separate means to limit the arc through which said drawing board may tilt; and a common locking device for releasably holding the hingeable limb and the tiltable drawing board in any desired position within their respective permitted turning arcs.
Claim 3
Dependent Claim
33 words
The device according to claim 1, wherein separate means are provided for adjusting the respective independent counterbalance means of said hingeable upper limb and said tiltable drawing board as varying conditions may require.
Claim 4
Dependent Claim
31 words
The device according to claim 1, wherein the arc limiting means through which the drawing board may turn can be accorded a predetermined setting and be subsequently adjusted to another setting.
Claim 5
Dependent Claim
106 words
The device according to claim 1, wherein the counterbalance means for the hingeable upper limb of said articulated column includes a transverse pivot pin fixedly supported by said column and on which the upper limb hinges, a grooved wheel rotatable thereon, a spoke extending radially therefrom, a projecting abutment secured on the limb engageable with said spoke causing said wheel to turn when the limb is hinged downwardly, a cable secured to the circumference of said wheel and running over the top of said wheel and down the side remote from said spoke and a tension spring biased between said cable and the drafting table base.
Claim 6
Dependent Claim
125 words
The device according to claim 1, wherein the counterbalance means for the tiltable drawing board includes a transverse pivot pin fixedly supported by said column and on which said upper limb hinges, a grooved pulley rotatable thereon, a transversely disposed tube rotatably carried by the upper end of said limb on which tube the drawing board is mounted, an annular member with a coaxial grooved part secured against rotation on said tube in line with said grooved pulley, an endless cable extending around said grooved part and said grooved pulley and secured to the former, a counterbalance cable terminally secured to said pulley and passing over the top of the pulley and a tension spring biased between said counterbalance cable and the drafting table base.
Claim 7
Dependent Claim
70 words
The device according to claim 4, wherein means to limit the arc through which the upper limb of said articulated column may hinge includes an anvil part on the column above said pivot pin and a quadrangular stop block mounted on said limb having two angularly related sides alternatively engageable with said anvil part when the limb is hinged to one end or the other of its permitted turning arc.
Claim 8
Dependent Claim
91 words
The device according to claim 5, wherein the means to limit the arc through which the drawing board may tilt includes a wheel secured against rotation on said pivot pin, a pair of inwardly extending radial lugs on said wheel disposed at an angle of approximately ninety degrees to each other, and a radial fin projecting from said grooved pulley engageable with the adjacent faces of said radial lugs that lie in its path and serve as positive stops to limit the tilting of the drawing board to the permitted arc.
Claim 9
Dependent Claim
114 words
The device according to claim 1, wherein said common locking device includes a transverse pin fixedly supported by said column and on which the upper limb hinges, a brake drum wheel secured thereon against rotation, a transverse tube rotatably mounted in the upper end of said limb by which the drawing board is carried, a brake drum clamped securely on said tube, a normally loose brake belt encircling said brake drum wheel and said brake drum, means attaching said belt to said limb to hold it against travel, and a manually operable locking member operating on said belt to tighten it on said brake drum wheel and brake drum respectively in friction gripping relation.
References Cited (Backward Citations)
US1900250A
Cited
US2988843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |